阅读说明：本技术 一种高效核能利用系统及方法 (A kind of efficient nuclear energy uses system and method ) 是由 吴放 王龙林 杨俊波 祁金胜 张书迎 胡训栋 刘义达 叶永强 隋菲菲 苗井泉 潘 于 2018-05-16 设计创作，主要内容包括：本发明公开了一种高效核能利用系统及方法,包括耦合用化石燃料锅炉,所述耦合用化石燃料锅炉将传统锅炉的水冷壁替换为汽冷墙式过热器；及用来调节锅炉炉膛不同区域火焰和烟气温度的烟气再循环系统,所述烟气再循环系统的烟气取自引风机后,由烟气再循环风机抽至炉膛各区域,在再循环风机至炉膛各区域的管路上设有调节风门,调节至炉膛不同区域的再循环烟气量,从而使得炉膛内各处的烟气温度可控,进而使得锅炉内烟气温度和蒸汽温度各处均可控。本发明特殊设计的采用烟气分区再循环技术的化石燃料锅炉,解决了耦合用化石燃料锅炉汽水系统和燃烧系统的自耦合问题,增强了核能与常规能源耦合的系统设计中的关键设备的可用性。(The invention discloses a kind of efficient nuclear energy uses system and method, including coupling fossil-fuel boiler, the water-cooling wall of conventional boiler is replaced with the cold wall superheater of vapour with fossil-fuel boiler by the coupling；And for adjusting the flue gas recirculation system of boiler furnace different zones flame and flue-gas temperature, after the flue gas of the flue gas recirculation system is derived from air-introduced machine, each region of burner hearth is evacuated to by gas recirculating fan, damper is equipped on the pipeline of recirculation blower to each region of burner hearth, it is adjusted to the flue gas recycled amount of burner hearth different zones, so that the flue-gas temperature in burner hearth everywhere is controllable, so that flue-gas temperature and vapor (steam) temperature are controllable everywhere in boiler.The fossil-fuel boiler using flue gas subregion recirculating technique of special designing of the present invention, solve coupling fossil-fuel boiler boiler circuit and combustion system from coupled problem, enhance the availability of the key equipment in the system design that nuclear energy is coupled with conventional energy resource.)

1. a kind of efficient nuclear energy uses system, characterized in that including condensate system, water supply system, steam generating system and steaming Vapour working system, the water of condensation is sequentially output to condensed water is low by the condensate system adds regenerator, fume afterheat to utilize dress It sets, another grade of condensed water be low plus regenerator and oxygen-eliminating device are heated；

Water after the water supply system heats oxygen-eliminating device is squeezed by feed pump to nuclear island heating；

The steam generating system includes nuclear island, coupling fossil-fuel boiler, and the water supply is formed in nuclear island by thermal evaporation The steam of the lower saturated vapor of temperature or micro- superheated steam, the nuclear island output is divided into two-way, and steam is all the way with heat convection Based on, that is, the low temperature convection superheater of using fossil-fuel boiler is exported to coupling, and the low temperature convection superheater is arranged in burner hearth The interior position close to furnace outlet, the lower saturation of temperature exported by the heating of low temperature convection superheater from nuclear island by flue gas are steamed Vapour or micro- superheated steam；Another way steam is then to be exported by wall superheater entrance header to wall superheater to heat, and is connect The radiation heat transfer and heat convection received are laid equal stress on, and the wall superheater outlet is equipped with wall superheater outlet header, two-way heating Steam afterwards converges in high temperature convection superheater entrance, and height overheat is further heated to be in high temperature convection superheater Steam；

The steam working system includes coupling steam turbine and generator, and the coupling includes coupling steam turbine with steam turbine High pressure cylinder and coupling turbine low pressure cylinder enter coupling in the steam of the height overheat of high temperature convection superheater outlet output and use It does work in steam turbine high-pressure cylinder and drives electrical power generators, it is low that the steam discharge of coupling steam turbine high-pressure cylinder enters coupling steam turbine Cylinder pressure further does work and drives electrical power generators；

The coupling is connected with flue gas recirculation system with fossil-fuel boiler, and the flue gas recirculation system passes through input flue gas The region different to coupling fossil-fuel boiler burner hearth is used to adjust burner hearth different zones flame and flue-gas temperature, so that burner hearth Flue-gas temperature inside everywhere is controllable, so that vapor (steam) temperature is controllable everywhere in boiler.

2. a kind of efficient nuclear energy uses system as described in claim 1, characterized in that the coupling steam turbine high-pressure cylinder and Coupling uses turbine low pressure cylinder coaxially arranged or split axle arrangement, split axle coupling steam turbine high-pressure cylinder and low pressure (LP) cylinder when arranging It is respectively connected to corresponding generator, coupling is connected to coupling vapour by main shaft with steam turbine high-pressure cylinder when coaxially arranged Turbine low pressure (LP) cylinder, coupling are connected to the shared generator of the two by main shaft with turbine low pressure cylinder.

3. a kind of efficient nuclear energy uses system as described in claim 1, characterized in that coupling fossil-fuel boiler packet Combustion chamber, burner hearth and back-end ductwork are included, burner hearth is located at the top of combustion chamber, and back-end ductwork is connected to burner hearth, wall superheater cloth It sets on the furnace wall of entire burner hearth；

The burner hearth is divided into afterflame region, dilatation region, convective region from bottom to top, and convective region is set gradually from bottom to top There are high temperature convection superheater and low temperature convection superheater.

4. a kind of efficient nuclear energy uses system as claimed in claim 3, characterized in that the dilatation region includes cone section, cone Preposition straight section, the dilatation region flue gas recirculation piping connection mouth of section, the dilatation region flue gas recirculation piping connection mouth position In on the preposition straight section of cone section, the preposition straight section of the cone section is located at the lower section of cone section, the preposition straight section and afterflame of the cone section Region connection, the dilatation region flue gas recirculation piping connection mouth are connected from dilatation region flue gas recirculation pipeline；

It is provided on burner hearth straight section between the middle part of the convective region, i.e. high temperature convection superheater and low temperature convection superheater Convective region flue gas recirculation piping connection mouth, in the convective region, area above convection current flue gas recirculation piping connection mouth Domain is disposed with low temperature convection superheater, and the convective region flue gas recirculation piping connection mouth connects convective region flue gas recirculation Pipeline；

The afterflame region includes one section of transition straight section burner hearth, afterflame region flue gas recirculation piping connection mouth, and the transition is straight Section burner hearth is connected with top of combustion chamber below, and is connected with the preposition straight section of the cone section above it, in the transition The further burning for the fuel that combustion chamber is discharged, the afterflame region flue gas recirculation piping connection mouth are realized in straight section burner hearth Connect afterflame region flue gas recirculation pipeline.

5. a kind of efficient nuclear energy uses system as claimed in claim 3, characterized in that be disposed in the back-end ductwork Denitrification apparatus and air preheater, the air preheater are connected to air-introduced machine by deduster, and fossil fuel is used in the coupling The low-temperature flue gas of boiler output leads to flue gas waste heat utilization device through air-introduced machine or the flue gas waste heat utilization device is located at sky Between air preheater and deduster, the condensed water of low-temperature flue gas heat-setting water system in the flue gas waste heat utilization device.

6. a kind of efficient nuclear energy uses system as claimed in claim 3, characterized in that the flue gas of the flue gas recirculation system It is derived from after air-introduced machine or before being derived from air-introduced machine, flue gas is delivered to difference through gas recirculating fan by the recirculating line respectively Afterflame region, dilatation region, the dilatation region flue gas recirculation pipeline of convective region, convective region flue gas recirculation pipe are set Road, afterflame region flue gas recirculation pipeline, the dilatation region flue gas recirculation pipeline, convective region flue gas recirculation pipeline, It is provided with damper on the flue gas recirculation pipeline of afterflame region, for being adjusted to the flue gas recycled of burner hearth different zones Amount.

7. a kind of efficient nuclear energy uses system as described in claim 1, characterized in that the coupling fossil-fuel boiler Inner Wall of Combustion Chamber, outer wall are provided with the insulating layer using heat-insulation material, arrival end and the burner phase of the combustion chamber Even, it is provided with powder feeding pipes entrance on the burner, the combustion chamber is provided with slag tap mouth.

8. a kind of efficient nuclear energy uses system as claimed in claim 7, characterized in that cooling tube is arranged inside the insulating layer Road, as emergency power, not water flowing or other media when normal operation, be passed through water when accident needs to cool down or other media come it is cold But combustion chamber.

9. a kind of efficient nuclear energy uses system as described in claim 1, characterized in that the coupling is adopted with fossil-fuel boiler With the type flame combustion room W or the flame combustion room of other shapes.

10. a kind of working method of efficient nuclear energy uses system as described in claim 1, characterized in that include:

Water and vapor are classified using nuclear island and fossil-fuel boiler, are segmented a liter parameter, is i.e. condensate system will condense Water by gland heater and #3 it is low be heated to be paragraph 1 heating, paragraph 1 heating after liquid water by fossil-fuel boiler combustion Flue gas waste heat utilization device after burning is heated to be the 2nd section of heating, and liquid water is heated to be the 3rd section by #2 is low after the 2nd section of heating Heating, liquid water is heated to be the 4th section of heating, liquid after steam generating system heats the 4th section by oxygen-eliminating device after the 3rd section of heating It is the 5th section of heating that water, which is heated to be steam by nuclear island, and steam was heated to be through overcoupling with fossil-fuel boiler after the 5th section of heating Hot steam is the 6th section of heating；Coupling with fossil-fuel boiler by slag tap mouth by the slag body after burning in liquid form Discharge；

Wherein, the saturated vapor or micro- superheated steam of nuclear island output enter coupling fossil-fuel boiler, specific carbonated drink process Are as follows:

The steam of nuclear island output is divided into two-way, and steam is based on heat convection all the way, i.e., output is to low temperature convection superheater, by cigarette Gas heats the lower saturated vapor of temperature or micro- superheated steam that export from nuclear island by low temperature convection superheater；Another way steam It is then output to wall superheater, the radiation heat transfer and heat convection received is laid equal stress on, and the steam after two-way heating is in high temperature pair Stream superheater entrance converges, and the steam overheated after being further heated in high temperature convection superheater for height, subsequently into It does work and generates electricity in coupling steam turbine；

In order to preferably control the coupling vapor (steam) temperature of fossil-fuel boiler heating surface everywhere, flue gas recirculation measure is used Coupling fossil-fuel boiler burner hearth flue-gas temperature everywhere and flue gas capacity are adjusted, according to physical height from low to high suitable The recirculating line of sequence, the bottom is located at afterflame region, that is, after combustor exit, and four wall of burner hearth is equipped with wall superheater Heat absorption, flue-gas temperature is high herein, is main radiation heat affected zone, which is provided with flue gas recirculation pipeline, referred to as afterflame Region flue gas recirculation pipeline；

The recirculating line of the second layer is dilatation region flue gas recirculation pipeline, is located at dilatation region, that is, high temperature to flowing through Before hot device entrance, dilatation region flue gas recirculation pipeline introduces low-temperature flue gas cooling and uprating, dilatation region flue gas recirculation The top burner hearth of pipeline is provided with cone section；

The recirculating line of third layer is between high temperature convection superheater and low temperature convection superheater, again for convective region flue gas Circulation line is used to further cool down to flue gas increase-volume.

Technical field

The present invention relates to energy technology fields, more particularly to a kind of efficient nuclear energy uses system.

Background technique

The nuclear power plant of modern Commercial is mainly Subcritical Units, and the reactor-loop coolant of boiling-water reactor nuclear power plant is drawn Enter steam turbine, radiation protection and waste processing are more complicated, therefore presurized water reactor is the mainstream of modern Commercial nuclear power technology.Conventional pressure Water-water reactor is generally two circuit systems, and wherein the steam of secondary coolant circuit system drives steam turbine power generation.Due to reactor catalyst carrier temperature Limitation (presurized water reactor mean outlet temperature is generally below 330 degrees Celsius), it is full that pressure lower (5.0~8.0MPa) can only be produced Want that steam moisture is again high than enthalpy drop very little with steam or micro- overheat (degree of superheat is 20~30 degrees Celsius) steam, full mechanism, in order to Increase single-machine capacity, steam flow is inevitable very big.At present the parameter of commercialization nuclear power plant secondary coolant circuit system be generally pressure about 6~ 8MPa, about 230 DEG C~290 DEG C or so of temperature, generating efficiency about 34%.Supercritical-Pressure Light Water Cooled Reactor (SCWR) reactor core outlet ginseng Number pressure about 25MPa, about 500 DEG C of temperature, compared with conventional presurized water reactor, a few circuit, the hot fluid of core exit directly into Enter steam turbine, system thermal efficiency is close to 45%, much higher than the thermal efficiency of conventional water cooled reator 34%.But Supercritical-Pressure Light Water Cooled Reactor is located always In research state, but since parameter greatly improves, lack heat transfer flow experiment and numeric data, and lack critical material in heap The reasons such as chemical property and mechanical property under the conditions of Supercritical-Pressure Light Water Cooled Reactor, technically there is also bigger difficulty, there is optimism Document is thought to need by 2028 to have commercial heap constructive ability.

Most of nuclear power plant all uses saturated vapor, and the work done of nuclear steam turbine 2/3 is completed in low pressure (LP) cylinder, but nuclear power The exhaust steam moisture of turbine low pressure cylinder is larger, and generally up to 12%~14%, it is be easy to cause blade erosion, corrosion, therefore general Using half speed turbine, and need after high pressure cylinder plus special separator dehumidified, reheating.And thermal power plant Superheated steam is generallyd use, the degree of superheat is high, generallys use full speed steam turbine.Half speed turbine root diameter is big, weight weight, generally For, the consumption of materials of half speed turbine than full speed steam turbine more than 2 times, for whole unit, half speed turbine Weight be about 1.2~2.4 times of full speed unit.The support loading of corresponding Turbine Engine Foundation also increases, and construction investment increases； Half speed turbine transport, lifting, in terms of investment it is also higher than full speed steam turbine.Equipment manufacturing cost and installation structural construction cost, Half Speed machine is higher than full speed machine by 20%~30% (to be equivalent to high 7% or so) to entire conventional island.

It is well known that the investment of nuclear power plant is much larger than thermal power plant, and the thermal efficiency of thermal power plant generally higher than nuclear power plant.Such as Fruit uses suitable method, builds suitable system, the therrmodynamic system of thermal power plant can be coupled into nuclear power plant, then can be big Width reduces initial cost, and can greatly improve operating thermal efficiency, and economy will be substantially improved.

Due to the inherent safety of high temperature gas cooled reactor, the design allowable temperature of fuel element is up to 1600 DEG C, therefore 10MW High-temperature gas-solid two-phase flow is completed.Document Zhu Shutang " modular high temperature gas cooled reactor supercritical steam cycle single reheat project study ", Propose within 2007 a kind of supercritical steam power cycle technology mature by Modular high-temperature air cooled reactor technology and at present The scheme of coupling matches the scheme of a machine using more heaps, and primary Ioops use helium closed circulation, and helium flows through pebble bed reactor from top to bottom Core is heated to 750 DEG C or so, and secondary circuit uses water and water steam, and vapor is heated to supercritical steam power by helium Temperature required for recycling, such as 565 DEG C, generating efficiency is up to 45% or more, however is also due to nuclear island part large size Change commercialized Some Key Technologies not make a breakthrough yet, therefore high temperature gas cooled reactor is still in conceptual phase.

The technological difficulties for needing to solve are broken through due to nuclear island and are much higher than conventional thermal power generating equipment, therefore nuclear power and supercritical steam are dynamic The key point of power circulation coupling, which is to place hope on, breaks through Nuclear island equipment to adapt to thermoelectricity parameter, but breaks through thermal power generating equipment Adapt to nuclear island parameter, however but never studied personnel pay attention to this thinking.

Summary of the invention

In order to solve the deficiencies in the prior art, an object of the present invention there is provided a kind of efficient nuclear energy uses system, Solve coupling fossil-fuel boiler boiler circuit and combustion system from coupled problem, realize coupling fossil fuel pot The saturated vapor exported from nuclear island or micro- superheated steam are heated to the steam that height overheats by furnace, enhance nuclear energy and conventional energy resource The availability of key equipment in the system design of coupling.

A kind of efficient nuclear energy uses system, including condensate system, water supply system, steam generating system and steam acting system System, the water of condensation is sequentially output to condensed water is low by the condensate system adds regenerator, flue gas waste heat utilization device, Ling Yiji Condensed water is low to add regenerator and oxygen-eliminating device to be heated；

Water after the water supply system heats oxygen-eliminating device is squeezed by feed pump to nuclear island heating；

The steam generating system includes nuclear island, coupling fossil-fuel boiler, and the water supply is in nuclear island by thermal evaporation The steam of the lower saturated vapor of formation temperature or micro- superheated steam, the nuclear island output is divided into two-way, and steam is all the way with convection current Based on heat exchange, that is, the low temperature convection superheater of using fossil-fuel boiler is exported to coupling, the low temperature convection superheater is arranged in Close to the position of furnace outlet in burner hearth, the temperature exported by the heating of low temperature convection superheater from nuclear island by flue gas is lower full With steam or micro- superheated steam；Another way steam is then to be exported by wall superheater entrance header to wall superheater to heat, The radiation heat transfer and heat convection received is laid equal stress on, and the wall superheater outlet is equipped with wall superheater outlet header, two-way Steam after heating converges in high temperature convection superheater entrance, and is further heated to be height in high temperature convection superheater and spends The steam of heat；

After flue gas and dilatation region flue gas recycled of the heat source of high temperature convection superheater from afterflame region converge Flue gas, the heat source of low temperature convection superheater from the flue gas and convective region flue gas recycled that dilatation region is come converge after cigarette Gas；

The steam working system includes coupling steam turbine and generator, and the coupling includes coupling vapour with steam turbine Turbine high pressure cylinder and coupling turbine low pressure cylinder enter coupling in the steam of the height overheat of high temperature convection superheater outlet output It shares and does work in steam turbine high-pressure cylinder and drive electrical power generators, the steam discharge of coupling steam turbine high-pressure cylinder enters coupling steamer Machine low pressure (LP) cylinder further does work and drives electrical power generators.

Further preferred technical solution, the coupling steam turbine high-pressure cylinder and the coaxial cloth of coupling turbine low pressure cylinder It sets or split axle arrangement, the coupling steam turbine high-pressure cylinder and low pressure (LP) cylinder are respectively connected to corresponding power generation when split axle is arranged Machine, coupling is connected to coupling turbine low pressure cylinder by main shaft with steam turbine high-pressure cylinder when coaxially arranged, and steam turbine is used in coupling Low pressure (LP) cylinder is connected to the shared generator of the two by main shaft.

Further preferred technical solution, the coupling is connected with flue gas recirculation system with fossil-fuel boiler, described Flue gas recirculation system is used to adjust burner hearth difference by input flue gas to the different region of coupling fossil-fuel boiler burner hearth Region flame and flue-gas temperature, so that the flue-gas temperature in burner hearth everywhere is controllable, so that vapor (steam) temperature is equal everywhere in boiler Controllably.

Further preferred technical solution, the coupling fossil-fuel boiler include combustion chamber, burner hearth and back-end ductwork, Burner hearth is located at the top of combustion chamber, and back-end ductwork is connected to burner hearth, and wall superheater is arranged on the furnace wall of entire burner hearth；

The burner hearth is divided into afterflame region, dilatation region, convective region from bottom to top, and convective region is from bottom to top successively It is provided with high temperature convection superheater and low temperature convection superheater；

The dilatation region includes cone section, the preposition straight section of cone section, dilatation region flue gas recirculation piping connection mouth, the expansion Hold region flue gas recirculation piping connection mouth to be located on the preposition straight section of cone section, the preposition straight section of the cone section is located under cone section The preposition straight section of side, the cone section is connect with afterflame region, and the dilatation region flue gas recirculation piping connection mouth connection is expanded certainly Hold region flue gas recirculation pipeline, the dilatation region by the dilatation region drawn after the air-introduced machine after furnace or before air-introduced machine again Circulating flue gas realizes that the increase-volume to the flue gas come from afterflame region cools down, and the purpose is to increase flue gas required for heat convection Amount.

The convective region is located at the top in dilatation region, and since exhaust gas volumn increases, therefore heat convection effect greatly enhances, And since flue gas is cooled down, therefore a possibility that heating surface overtemperature tube burst, substantially reduces, and the safety of boiler greatly improves, In Flue gas is mainly realized by way of heat convection to the steam in high temperature convection superheater, low temperature convection superheater in the region Heating.

It is set on burner hearth straight section between the middle part of the convective region, i.e. high temperature convection superheater and low temperature convection superheater It is equipped with convective region flue gas recirculation piping connection mouth, in the convective region, on convection current flue gas recirculation piping connection mouth Square region is disposed with low temperature convection superheater, and the convective region flue gas recirculation piping connection mouth connection convective region flue gas is again Circulation line is realized by the convective region flue gas recycled drawn after the air-introduced machine after furnace or before air-introduced machine to from high temperature pair The further increase-volume cooling of the flue gas of superheater outlet is flowed, therefore further enhances the heat convection effect of low temperature convection superheater Fruit, while also further reduced the risk of low temperature convection superheater overtemperature tube burst.

The afterflame region includes one section of transition straight section burner hearth, afterflame region flue gas recirculation piping connection mouth, the mistake It crosses straight section burner hearth to be connected with top of combustion chamber below, and is connected with the preposition straight section of the cone section above it, described The further burning for the fuel that combustion chamber is discharged is realized in transition straight section burner hearth, the afterflame region flue gas recirculation pipeline connects Interface connects afterflame region flue gas recirculation pipeline, is followed again by the afterflame region drawn after the air-introduced machine after furnace or before air-introduced machine Ring flue gas realizes the cooling of the further increase-volume to the flue gas come from combustion chamber, can prevent wall superheater overtemperature tube burst, The operative liquid lime-ash that could not be excluded in time that can be taken out of from combustion chamber, which is cooled to solid-state and unites, settles back combustion chamber regions, And it avoids liquid lime-ash from arriving higher hearth region and stains heating surface.

Convective region flue gas recirculation pipeline is used to further cool down to flue gas increase-volume, improves low temperature convection current overheat to realize The purpose of device heat convection effect, the heat output of heat convection are determined by heat transfer formula, include exhaust gas volumn in the formula that conducts heat It is poor with holding.

Further preferred technical solution is disposed with denitrification apparatus and air preheater, institute in the back-end ductwork It states air preheater and air-introduced machine is connected to by deduster, the low-temperature flue gas that the coupling is exported with fossil-fuel boiler is through air inducing Machine leads to flue gas waste heat utilization device or the flue gas waste heat utilization device between air preheater and deduster, low The condensed water of warm flue gas heat-setting water system in the flue gas waste heat utilization device, quilt in the flue gas waste heat utilization device The condensed water of heating further through it is low plus, oxygen-eliminating device, feed pump be sent to nuclear island.

The flue gas of further preferred technical solution, the flue gas recirculation system is derived from after air-introduced machine or is derived from air-introduced machine Before, flue gas is evacuated to by each region of burner hearth by recirculating line by gas recirculating fan, the recirculating line through flue gas again Circulating fan flue gas is delivered to respectively be separately positioned on afterflame region, dilatation region, convective region dilatation region flue gas again Circulation line, convective region flue gas recirculation pipeline, afterflame region flue gas recirculation pipeline, dilatation region flue gas recirculation Pipeline, convective region flue gas recirculation pipeline are provided with damper on the flue gas recirculation pipeline of afterflame region, for adjusting To the flue gas recycled amount of burner hearth different zones.

Further preferred technical solution, Inner Wall of Combustion Chamber, the outer wall of coupling fossil-fuel boiler are provided with Using the insulating layer of heat-insulation material, the arrival end of the combustion chamber is connected with burner, is provided with and send on the burner Powder pipeline entrance, the combustion chamber are provided with slag tap mouth.

Further preferred technical solution, the insulating layer inside are arranged cooling line, as emergency power, operate normally When not water flowing or other media, water or other media are passed through when accident needs to cool down to cool down combustion chamber.

The flue gas waste heat utilization device is surface-type heat exchanger, and heat medium is flue gas, and the medium being heated is condensation Water, be connected to reactor is the medium being heated.

Further preferred technical solution, the coupling use W type flame combustion room or other shapes with fossil-fuel boiler The flame combustion room of shape.

The second object of the present invention is to provide a kind of working method of efficient nuclear energy uses system, comprising:

Water and vapor are classified using nuclear island and fossil-fuel boiler, are segmented a liter parameter, is i.e. condensate system will The water of condensation is heated to be paragraph 1 heating by gland heater and #3 are low, and liquid water passes through fossil fuel pot after paragraph 1 heating Flue gas waste heat utilization device after furnace burning is heated to be the 2nd section of heating, and liquid water passes through that #2 is low to be heated to be the after the 2nd section of heating 3 sections of heating, liquid water is heated to be the 4th section of heating by oxygen-eliminating device after the 3rd section of heating, and steam generating system will be after the 4th section of heating It is the 5th section of heating that liquid water, which is heated to be steam by nuclear island, and steam is heated through overcoupling with fossil-fuel boiler after the 5th section of heating It is the 6th section of heating for superheated steam；Coupling fossil-fuel boiler passes through slag tap mouth for the slag body after burning with liquid Form discharge；The wherein heat source of the 6th section of heating, the heat source of high temperature convection superheater is from the next flue gas in afterflame region and dilatation area Domain flue gas recycled converge after flue gas, the flue gas and convective region that the heat source of low temperature convection superheater comes from dilatation region are again Circulating flue gas converge after flue gas.

Wherein, the saturated vapor or micro- superheated steam of nuclear island output enter coupling fossil-fuel boiler, specific carbonated drink Process are as follows:

The steam of nuclear island output is divided into two-way, and steam is based on heat convection all the way, i.e. output to low temperature convection superheater, The lower saturated vapor of temperature or micro- superheated steam that export from nuclear island are heated by low temperature convection superheater by flue gas；Another way Steam is then output to wall superheater, and the radiation heat transfer and heat convection received is laid equal stress on, and the steam after two-way heating is in height Warm convection superheater entrance converges, and the steam overheated after being further heated in high temperature convection superheater for height, then Into power generation of doing work in coupling steam turbine；

In order to preferably control the coupling vapor (steam) temperature of fossil-fuel boiler heating surface everywhere, flue gas recirculation is used Measure adjusts coupling fossil-fuel boiler burner hearth flue-gas temperature everywhere and flue gas capacity, from low to high according to physical height Sequentially, the recirculating line of the bottom is located at afterflame region, that is, after combustor exit, and four wall of burner hearth is overheated equipped with wall Device heat absorption, flue-gas temperature is high herein, is main radiation heat affected zone, which is provided with flue gas recirculation pipeline, referred to as continuous Fire region flue gas recirculation pipeline；

The recirculating line of the second layer is dilatation region flue gas recirculation pipeline, is located at dilatation region, that is, high temperature pair Before flowing superheater entrance, dilatation region flue gas recirculation pipeline introduces low-temperature flue gas cooling and uprating, and dilatation region flue gas is again The top burner hearth of circulation line is provided with cone section；

The recirculating line of third layer is convective region cigarette between high temperature convection superheater and low temperature convection superheater Gas recirculating line is used to further cool down to flue gas increase-volume.

The working medium that the application heats herein is water or vapor.

Compared with prior art, the beneficial effects of the present invention are:

1, the fossil-fuel boiler using flue gas subregion recirculating technique of special designing of the present invention solves coupling useization Stone fuel boiler boiler circuit and combustion system from coupled problem, enhance in the system design that nuclear energy is coupled with conventional energy resource Key equipment availability.

2, the discarded flue gas of flue gas subregion recycling low temperature, increases flue gas capacity, improves heat convection effect Fruit reduces Coal-fired capacity.

3, the design of dilatation cone section takes full advantage of the space of burner hearth, save the weight of boiler heating surface and steel construction with Cost.

4, the strategy of zonal control flue-gas temperature reduces the risk of heating surface overtemperature tube burst, also reduces each section of heating surface Material cost, the especially material cost of low temperature superheater, without using expensive resistance to height in low temperature superheater region Adiabator.

5, coupling uses slag tap with boiler, and for the more adaptable of coal, heating surface, which stains, to be reduced, and boiler is more pacified Entirely, it is particularly suited for coupling with the nuclear island more demanding to security performance.

6, the advantages of steam turbine split axle is arranged further include: high pressure cylinder high-order can be arranged, export nearest cloth with Boiler Steam It sets, reduces expensive main steam, the length of jet chimney, reduce cost, and low pressure (LP) cylinder can reduce civil engineering with low position Cost.

7, the tail flue gas between smoke evacuation or air preheater and deduster after making full use of air-introduced machine to recycle is solidifying to heat Bear water, reduce at least one level it is low plus, reduce the investment of heat regenerative system, and the low plus steam extraction saved can be with multiple electricity.

8, boiler export temperature greatly improves turbine efficiency, and used heating surface is resistance at 500 DEG C~700 DEG C The reliability of high-temperature material is verified in the thermal power plant gone into operation in the recent period, therefore this system is safe and efficient, energy-saving ring It protects.

9, the thermal efficiency of coupled heat system is improved on the basis of conventional nuclear power 34% to 45% or so, while being used Nuclear island technology it is mature, it is (such as hot to avoid the various technical problems occurred in Supercritical-Pressure Light Water Cooled Reactor research application process Work water force problem, critical material performance puzzle, radiation protection problem etc.)；

10, with the raising of efficiency, compared with the nuclear power unit of same generated energy, steam required for unit generation is coupled Amount declines to a great extent, and about 15%, considered with identical loss of steam and water, the operating cost of moisturizing processing will also be greatly reduced.

11, coupling process makes full use of the technical characterstic of nuclear island and fossil-fuel boiler, water and vapor are classified, Segmentation rises parameter, improves generating efficiency by breaking through thermal power generating equipment to adapt to the thinking of nuclear island parameter.Wherein it has been generally acknowledged that skill The higher nuclear island part of art difficulty can slightly change can be realized on the basis of existing mature technology, and fossil-fuel boiler part is logical It crosses design optimization described in this patent to be also easy to realize, therefore with other efficient nuclear power technologies (as Zhu Shutang 2007 propose It is scheme that Modular high-temperature air cooled reactor technology is coupled with supercritical steam power cycle technology mature at present, overcritical Water cooled reator technology etc.) it compares, a whole set of technology is more easily performed.

12, using conventional two circuit technology of nuclear island, radiation protection and waste processing comparative maturity are simple.

13, high add-back hot systems are eliminated, the high pressure cylinder steam extraction amount for being originally used for high add-back heat can be used for generating electricity, sufficiently High-quality energy is utilized；Meanwhile the radiation loss of heater is also cancelled therewith, reduces the loss in conversion process of energy, Be conducive to improve the efficiency of energy utilization of coupling unit entirety.

14, since steam superheat is higher, after steam turbine does work, exhaust steam moisture is far below the nuclear power vapour of modern Commercial Turbine, therefore have the condition using lighter more compact full speed steam turbine, greatly reduce investment.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.

Fig. 1 is the overall structure diagram of an embodiment of the present invention；

Fig. 2 is the overall structure diagram of another examples of implementation of the present invention；

Fig. 3 is steam flow diagram of the present invention；

In figure, 1, nuclear island, 2, wall superheater outlet header, 3, low temperature convection superheater, 4, high temperature convection superheater, 5, Burner, 6, combustion chamber, 7, slag tap mouth, 8, insulating layer, 9, afterflame region flue gas recirculation pipeline, 10, dilatation region cigarette Gas recirculating line, 11, convective region flue gas recirculation pipeline, 12, denitrification apparatus, 13, air preheater, 14, deduster, 15, air-introduced machine, 16, recirculation blower, 17, coupling use turbine low pressure cylinder, 18, oxygen-eliminating device, 19, feed pump, 20, #2 it is low plus, 21, flue gas waste heat utilization device, 22, #3 it is low plus, 23, condenser, 24, gland heater, 25, desulfurizer, 26, chimney, 27, Coupling steam turbine high-pressure cylinder, 28, coupling fossil-fuel boiler, 29, generator, 30, wall superheater, 31, wall overheat Device entrance header.

Specific embodiment

It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.

As background technique is introduced, exist in the prior art nuclear energy with it is not dedicated in conventional energy resource coupled system The deficiency of boiler, in order to solve technical problem as above, present applicant proposes a kind of efficient nuclear energy uses system and methods.

In a kind of typical embodiment of the application, as shown in Figure 1, a kind of efficient nuclear energy uses system is provided, In, the system capital equipment that nuclear energy and conventional energy resource are coupled includes nuclear reactor and its auxiliary equipment (referred to as " nuclear island 1 "), coupling Share fossil-fuel boiler 28, coupling steam turbine high-pressure cylinder 27, coupling turbine low pressure cylinder 17, generator 29, #2 it is low plus 20 (low plus regenerators), #3 are low to add 22 (low plus regenerators), oxygen-eliminating device 18, flue gas waste heat utilization device 21, feed pump 19, condensing The equipment such as device 23.Wherein, coupling adjusts the flame and flue gas temperature in burner hearth with fossil-fuel boiler using the recycling of flue gas subregion It spends and then adjusts vapor (steam) temperature.The Modular high-temperature air cooled reactor technology proposed in the prior art is overcritical with current maturation There is no fossil-fuel boiler in the scheme of Steam Power Circulation technology coupling.In addition, nuclear energy and conventional energy resource in existing technology Coupled system in do not introduce the coupling measure of itself fuel system of coupling fossil-fuel boiler and boiler circuit, but only Only illustrate to replace with heat exchanger.

Heat about the release of nuclear island part is mainly used to will be water, and the heat master for the thermoelectricity system release being coupled To be used to heat liquid water and improve the degree of supersaturation of steam.Into steam turbine steam pressure using former nuclear steam turbine into Mouthful pressure, and enter the vapor (steam) temperature of steam turbine using conventional thermoelectricity system inlet temperature (such as subcritical 538 DEG C, it is super to face 566 DEG C~700 DEG C etc. of boundary).Superheated steam initially enters high pressure cylinder acting power generation, and the high pressure cylinder steam discharge after finishing function enters low pressure Cylinder further does work power generation, and the steam exhaust after function is finished in low pressure (LP) cylinder, which enters, is condensed into condensed water in condenser.Condensate system The cigarette using coupling fossil-fuel boiler tail portion is increased on the basis of the condensed water of conventional thermoelectricity system low add-back hot systems Gas residual heat using device carrys out heat-setting water, and the water supply after oxygen-eliminating device squeezes into nuclear island using feed pump.Water supply system cancels high add Heat regenerative system, the height of saving add steam extraction for the multiple electricity of high pressure cylinder, and traditional approach relies on the water supply of high add-back heat heating, in water supply When still keeping liquid, mainly complete to be heated in the back-end ductwork flue gas waste heat utilization device of fossil-fuel boiler.

Coupling and decoupling method are related to hierarchical segmented liter of parametric technique of water and vapor.Traditional thermal power plant, water and water The liter parametric procedure of steam carries out all in fossil-fuel boiler；The liter parametric procedure of traditional nuclear power plant, water and vapor is all It is carried out in nuclear island.Coupling process described in this patent makes full use of the technical characterstic of nuclear island and fossil-fuel boiler, water and Vapor is classified, is segmented a liter parameter, i.e., gland heater 24 is low with #3 adds 22 (heat source comes from the 3 grades of steam extractions of steam turbine low pressure (LP) cylinder) For paragraph 1 heating, fossil-fuel boiler burning after flue gas waste heat utilization device 21 be the 2nd section heating, #2 it is low plus 20 (heat source come From 2 grades of low pressure (LP) cylinder) it is the 3rd section of heating, oxygen-eliminating device 18 (heat source comes from intermediate pressure cylinder steam discharge) is the 4th section of heating, and nuclear island 1 is the 5th section Heating, fossil-fuel boiler are the 6th section of heating.Wherein, when normal operation, the steam after the from the 1st to the 6th section of heating is known as main steaming Vapour, wherein the included bypass of the 1st, 2,3 section of heating, when Local Accidents operating condition can cut off the 1st, 2,3 section to water heating respectively Process and be directly bypassed into the heating process of next stage.Nuclear island is main heating source, fossil-fueled boiler is time Heating source.The heat source of 5th section of heating is from main heating source, and the heat source of the 2nd, 6 section of heating is from secondary heating source.In secondary heating In source, the heating that the 2nd section of liquid water is basic bringing-up section, and the 6th section of steam be heated to be proposes effect bringing-up section.

Particularly, liquid water is heated from two aspects, first is that fossil-fuel boiler medium temperature, low-temperature flue gas waste heat utilize Device, second is that (in conventional nuclear power conventional island and conventional thermoelectricity therrmodynamic system, low add-back heat is for the low add-back heat of extracted steam from turbine For routine techniques).The gasification of water occurs in the steam generator of nuclear island, and the overheat of water vapour occurs in fossil fuel pot In furnace.Wherein, the parameter of the gasification of water takes full advantage of the parameter area of existing reactor core primary Ioops, for example AP1000 mono- is returned Road hot-side temperature is about 324 DEG C, it is contemplated that the factors such as heat exchange difference, the upper limit of corresponding secondary circuit outlet temperature is substantially 300 DEG C hereinafter, the corresponding pressure of 300 DEG C of saturated vapors is about 8.58MPa according to the thermal physical property data of saturated vapor.For preferred 280 DEG C of secondary circuit outlet temperature design parameter, the corresponding pressure of saturated vapor is about 6.4MPa, the nuclear power of this and modern Commercial The secondary circuit pressure and temperature of factory relatively coincide.Due to the inlet and outlet fluid properties of nuclear island in coupled system and modern Commercial nuclear island Inlet and outlet fluid properties it is very close, so for nuclear island, difficult point is technically not present, this greatly reduces technology and answers Use difficulty.In fossil-fuel boiler, this technology can pass through reasonable cloth there is no conditionality factors such as the developments of critical material Radiation and convection heating surface are set, realizes that water and vapor segmentation rise the purpose of parameter.

In coupled heat system, the vapor (steam) temperature into the superheated steam of steam turbine has reached close to critical or overcritical steaming The parameter of vapour power cycle, in general, turbine inlet initial steam temperature is every to improve 20 degree, and cycle efficieny can be improved 1 Percentage point, for overcritical 566 DEG C, compared with 280 DEG C of conventional nuclear island, vapor (steam) temperature improves 286 DEG C, then steam follows About 14.3% or so can be improved on ring efficiency theory, this will degree of being greatly reduced electricity cost, it is and same simultaneously as the raising of efficiency The nuclear power unit of equal generated energy is compared, and about 15% or more can also be declined to a great extent by coupling quantity of steam required for unit generation, with Identical loss of steam and water considers that moisturizing processing cost will also be greatly reduced.On the other hand, since steam superheat is higher, After steam turbine does work, exhaust steam moisture is far below the nuclear steam turbine of modern Commercial, therefore has using lighter more compact Full speed steam turbine condition, greatly reduce investment.

For realizing that coupling, the application certainly of boiler itself fuel system and boiler circuit have made coupling fossil fuel Boiler, concrete measure are: eliminating the water-cooling wall of conventional boiler, increase wall superheater 30, increase for regulating stove The flue gas recirculation system of thorax different zones flame and flue-gas temperature, after the flue gas of the flue gas recirculation system is derived from air-introduced machine Or before being derived from air-introduced machine 15, each region of burner hearth is evacuated to by dedicated gas recirculating fan 16, it is each to burner hearth in recirculation blower The pipeline in region is equipped with damper, the adjustable flue gas recycled amount for going different zones, so that in burner hearth everywhere Flue-gas temperature it is controllable so that " pot " of boiler inner vapor (steam) temperature is controllable everywhere.

" furnace " of coupling fossil-fuel boiler is compared with traditional fossil-fuel boiler, and fossil-fuel boiler is used in coupling The water-cooling wall of conventional boiler is replaced with into the cold wall superheater of vapour；Since water without water-cooling wall, can not be played in " pot " in phase To in-furnace temperature convenient for the advantage of control during change, therefore use the combustion chamber of insulated design.Due to burning after flying dust to by Hot face wash away strongly and the factors such as contamination of the flying dust on heating surface would be possible to lead to the accidents such as boiler maintenance, stoppage in transit Situation, for nuclear energy couples fossil energy boiler system, the unplanned outage of boiler also results in nuclear island coupled thereto Stop transport and corresponding nuclear reactor safety problem, in order to avoid or reduce a possibility that above phenomenon occurs, fossil is used in coupling Fuel boiler uses wet bottom boiler, and a large amount of lime-ash is discharged from burner hearth bottom in liquid form.

Compared with dry ash extraction, for the coal of same quality, the combustion temperature in hearth that slag tap needs is higher, using exhausted The combustion chamber of thermal design is more conducive to accomplish slag tap due to not absorbing heat in combustion chamber.It is stain due to reducing, liquid row For slag boiler for the more adaptable of coal, boiler is safer, be particularly suited for the nuclear island more demanding to security performance into Row coupling.

Traditional fossil energy boiler is due to needing water from liquid to the process of gaseous state phase transformation, therefore radiation heating-surface is heated Shared ratio is relatively high in face, and without water from liquid to gaseous state phase transformation inside the heat absorption system of coupling fossil-fuel boiler Process, steam by saturated vapor or micro- superheated steam heat absorption become height superheated steam process mainly passes through heat convection It is not radiation heat transfer, therefore, what is arranged in burner hearth is more heat convection face rather than radiation heat transfer face.

For heat convection face, flue gas flow rate is extremely important for heat transfer effect.Flow velocity is high, heat convection system Number is high, then good effect of heat exchange, boiler thermal efficiency are generally higher.This patent need boiler export vapor (steam) temperature be 700 DEG C and with Under, thus reasonable flue gas be largely 1000 DEG C or so medium temperature flue gas rather than a small amount of high temperature at 2000 DEG C or so Flue gas.

However, ash fusion point is generally at 1500 DEG C or so, in order to realize slag tap, the temperature of the combustion chamber of insulated design can To be up to 2000 DEG C, but the flue gas after burning enters heat exchange area, if the flue-gas temperature for participating in heat exchange is still up to 2000 DEG C, The cost of so used heat-resisting material will also be much higher than the cost of the scheme of 1000 DEG C of flue gases participation heat exchange.

Therefore, in order to reduce the investment of boiler heating surface, while heat exchange efficiency is improved, a kind of feasible method is after furnace It extracts low-temperature flue gas and enters burner hearth recycling, on the one hand reduce the flue-gas temperature of heat exchange area, on the other hand increase flue gas Amount, improves heat convection effect.Preferably, the low-temperature flue gas of 200 DEG C and following temperature can be used after air-introduced machine.

Preferably, boiler uses W type flame combustion room, is insulated around combustion chamber using thermal insulation material, is set inside insulating layer A small amount of cooling line is set as emergency power, not water flowing when normal operation is passed through water to cool down burning when accident needs to cool down Room.

The saturated vapor or micro- superheated steam come out from nuclear island enters the carbonated drink process sequence of coupling fossil-fuel boiler It is as shown in Figure 3:

That is, the steam that nuclear island comes is divided into two-way before this, all the way based on heat convection, i.e., low temperature convection current is overheated Device is arranged in burner hearth close to the position of furnace outlet, herein due to arranging numerous be heated from combustion chamber to furnace outlet Face, and there is the convective region flue gas recycled pipeline being specially arranged all the way further to give flue gas increase-volume (increasing volume flow) drop Temperature, so flue-gas temperature herein is lower, suitable heat from the temperature that nuclear island comes out is not especially high (about 300 degrees Celsius or less) Saturated vapor or micro- superheated steam；Another way is then output to wall superheater, the radiation heat transfer and heat convection received Lay equal stress on, the wall superheater is arranged on the furnace wall of entire burner hearth (except combustion chamber), and the water-cooling wall of similar conventional boiler (passes System boiler also has the saying and arrangement of wall superheater, but shared ratio in four wall heating surface of burner hearth is minimum, can only be at last The supplement of water-cooling wall), 30 entrance of wall superheater is equipped with wall superheater entrance header 31, and the outlet of wall superheater 30 is equipped with wall Formula super-heater exit case 2.This two-way converges in the entrance of high temperature convection superheater 4, and into one in high temperature convection superheater Step is heated the steam of referred to as height overheat, generates electricity subsequently into doing work in coupling steam turbine high-pressure cylinder.Steam turbine is used in coupling High pressure cylinder steam discharge enters further acting power generation in coupling turbine low pressure cylinder.

In order to cooperate the arrangement of boiler circuit, burner hearth flue-gas temperature everywhere and cigarette are adjusted using flue gas recirculation measure Gas capacity.According to the sequence of physical height from low to high, the recirculating line of the bottom is located at afterflame region, that is, combustion chamber Outlet, four wall of burner hearth here absorb heat equipped with wall superheater, and it is main radiation heat affected zone that flue-gas temperature is high herein, but Heating surface overtemperature tube burst in order to prevent, also for can the operative liquid lime-ash of could not excluding in time of taking out of from combustion chamber is cooling It at solid-state and unites and settles back combustion chamber regions, and avoid liquid lime-ash from arriving higher hearth region and stain heating surface, specially Flue gas recirculation pipeline, referred to as afterflame region flue gas recirculation pipeline 9 are provided in this region.

The recirculating line of the second layer is that dilatation region flue gas recirculation pipeline 10 is located at dilatation region, that is, high temperature pair Superheater entrance is flowed, due to a large amount of flue gas of convection recuperator needs (flow velocity can be improved and then enhance heat transfer effect) and about 1500 degrees Celsius of temperature below, therefore introduce low-temperature flue gas cooling and uprating herein, referred to as dilatation region flue gas recirculation Pipeline, since exhaust gas volumn increases, so burner hearth is provided with cone section in the top of this pipeline, it is heated for increasing heat convection The arrangement areas in face improves the utilization rate of furnace cavity.

The recirculating line of third layer is convective region between high temperature convection superheater 4 and low temperature convection superheater 3 Flue gas recirculation pipeline 11 is used to further cool down to flue gas increase-volume, and it is quick-fried that lower flue-gas temperature can reduce heating surface overtemperature The risk of pipe, also reduces the material cost of low temperature superheater, and the heating effect of low temperature superheater can be improved in bigger exhaust gas volumn. The flue-gas temperature reduced simultaneously can guarantee that denitrification apparatus uses common catalyst rather than the high temperature catalyst of valuableness, thus Reduce the cost of investment and operation replacement.

The bottom of fossil-fuel boiler is combustion chamber 6, and the both ends of combustion chamber are respectively arranged with burner 5, the bottom of combustion chamber Portion is provided with slag tap mouth 7, and the inner and outer wall of combustion chamber is respectively arranged with insulating layer 8.

As shown in Figure 1, the flue gas of fossil-fuel boiler output successively passes through denitrification apparatus 12, air preheater 13, dedusting Device 14, air-introduced machine 15, then divide two-way, all the way to flue gas waste heat utilization device, another way to recirculation blower.Fume afterheat benefit Desulfurizer 25, chimney 26 are sequentially connected to device output end.Wherein, after the flue gas of flue gas recirculation system is derived from air-introduced machine Or before being derived from air-introduced machine.

In another embodiment of the present invention, as shown in Fig. 2, flue gas waste heat utilization device 21 is arranged in air preheater 13, between deduster 14, condensed water through #3 it is low plus by flue gas waste heat utilization device 21 be connected to #2 it is low plus.

The high pressure cylinder of steam turbine and low pressure (LP) cylinder coaxially arranged can also be arranged in the application with split axle.It is needed when split axle is arranged To increase a generator more.

The application eliminates high add-back hot systems, and due to reducing high plus heating steam extraction, therefore these steam extractions being reduced can To be used to multiple electricity, there is document report (Sun Fengzhong, large-size steam turbine operation, P178), the height in traditional thermal power plant adds (high pressure Heater) when all being withdrawn from from heat regenerative system, the power of condensing turbine can increase by 10%, and the power of cogeneration turbine can Increase by 14%.

For traditional thermal power plant, height, which adds to withdraw from, will lead to reduction thermal efficiency of cycle, although therefore can be increased with multiple electricity Coal consumption, thus it is in general uneconomical；But for the nuclear energy of 1000MW grade and fossil energy coupled system, due to the water inlet of nuclear island Temperature requirement is not higher than 220 degrees Celsius, and the feed temperature than 300 degrees Celsius traditional of 1000MW thermal power plant is low, oxygen-eliminating device temperature In 220 degrees centigrades, therefore add even if not setting height, thermal efficiency of cycle will not be reduced.

The high-pressure heater of traditional approach is located at water supply pump discharge, and the pressure of receiving is high, and works at a higher temperature, Service condition is poor, and the chance to break down is more.Once breaking down, or because caused by serious leak when shell-side full water, it is possible to It causes vapour, water to import steam turbine, jeopardizes unit safety, therefore the application cancels high add-back hot systems, in no reduction cycling hot While efficiency, raising generated energy, the safety of system is also enhanced.

The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.