阅读说明：本技术 用于热电厂的电锅炉与首站并联热电调峰系统 (Electric boiler and head station parallel thermoelectric peak regulation system for thermal power plant ) 是由 张金柱 石天庆 梁新磊 商永强 刘亚伟 刘媛媛 贾天翔 李娜 关秀红 尹荣荣 张 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种用于热电厂的电锅炉与首站并联热电调峰系统,包括供热管网、汽轮机组和背压凝汽器,每个汽轮机组均包括汽轮机中压缸和汽轮机低压缸,汽轮机中压缸和汽轮机低压缸管道连接,汽轮机低压缸与所述背压凝汽器管道连接,汽轮机中压缸上设置有排气支路,不同组的汽轮机中压缸之间还设置有联通管路,排气支路上设置有高背压汽轮发电机组,不同的高背压汽轮发电机组通过联通管路管道连接,所述高背压汽轮发电机组的排气口上设置有加热器,加热器与背压凝汽器管道连接,汽轮机组与电锅炉加热系统电连接,电锅炉加热系统与背压凝汽器管道连接,背压凝汽器与供热管网管道连接,满足供热需求并降低发电负荷参与采暖季调峰辅助服务。(The invention discloses a thermoelectric peak regulation system for parallel connection of an electric boiler and a head station of a thermal power plant, which comprises a heat supply pipe network, turbine units and a backpressure condenser, wherein each turbine unit comprises a turbine intermediate pressure cylinder and a turbine low pressure cylinder, the turbine intermediate pressure cylinder and the turbine low pressure cylinder are connected through a pipeline, the turbine low pressure cylinder is connected with the backpressure condenser through a pipeline, an exhaust branch is arranged on the turbine intermediate pressure cylinder, communicated pipelines are also arranged between the turbine intermediate pressure cylinders of different groups, a high backpressure turbine generator set is arranged on the exhaust branch, different high backpressure turbine generator sets are connected through a communicated pipeline, a heater is arranged on an exhaust port of the high backpressure turbine generator set, the heater is connected with the backpressure condenser through a pipeline, the turbine units are electrically connected with an electric boiler heating system, the electric boiler heating system is connected with the backpressure condenser through a pipeline, and the backpressure condenser is connected with the pipe network pipeline, the heat supply requirement is met, and the power generation load is reduced to participate in peak shaving auxiliary service in the heating season.)

1. A thermoelectric peak regulation system that is used for electric boiler and first station parallelly connected of steam power plant, including heat supply pipe network, turbine unit and backpressure condenser (13), its characterized in that: the steam turbine set is at least one group, the backpressure condenser (13) is at least one, each steam turbine set comprises a steam turbine intermediate pressure cylinder (1) and a steam turbine low pressure cylinder (8), the steam turbine intermediate pressure cylinder (1) and the steam turbine low pressure cylinder (8) are connected through a pipeline, the steam turbine low pressure cylinder (8) is connected with the backpressure condenser (13) through a pipeline, an exhaust branch is arranged on the steam turbine intermediate pressure cylinder (1), communicated pipelines are further arranged between the steam turbine intermediate pressure cylinders (1) of different groups, a high backpressure steam turbine generator set is arranged on the exhaust branch, different high backpressure steam turbine generator sets are connected through communicated pipelines, a heater (20) is arranged on an exhaust port of the high backpressure steam turbine generator set, the heater (20) is at least one, and the heater (20) is connected with the backpressure condenser (13) through a pipeline, the utility model discloses a steam turbine, heater (20) both ends are still parallel connection have at least a set of electric boiler heating system, the turbine unit is connected with electric boiler heating system electricity, electric boiler heating system and backpressure condenser (13) pipe connection, backpressure condenser (13) and heat supply pipe network pipe connection.

2. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 1, wherein: the steam turbine set further comprises a first generator (9), the steam turbine low-pressure cylinder (8) is rotatably connected with the first generator (9), and the first generator (9) is electrically connected with the electric boiler heating system.

3. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 1, wherein: the high back pressure turbo generator set comprises a high back pressure steam turbine (5) and a second generator (6), the high back pressure steam turbine (5) is rotatably connected with the second generator (6), a first adjusting valve (7) is arranged on the high back pressure steam turbine (5), and different high back pressure steam turbines (5) are connected with different heaters (20) through the first adjusting valve (7) in a pipeline mode.

4. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 2, wherein: electric boiler heating system includes plate heat exchanger (25), electric boiler (29) and stove water circulating pump (28), plate heat exchanger (25) are including first heat transfer import (27), second heat transfer import (32), first heat transfer export (26) and second heat transfer export (31), second heat transfer export (31) and electric boiler (29) pipe connection, electric boiler (29) and stove water circulating pump (28) pipe connection, stove water circulating pump (28) and second heat transfer import (32) pipe connection, electric boiler (29) are connected with first generator (9) electricity.

5. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 4, wherein: all be provided with first heat transfer governing valve (33) on first heat transfer import (27) and first heat transfer export (26), be provided with heat transfer inlet end (21), heat transfer play liquid end (23), heat transfer inlet end (22) and heat transfer drainage end (24) on heater (20), all be provided with second heat transfer governing valve (19) on heat transfer inlet end (21) and the heat transfer play liquid end (23), heater (20) are through first heat transfer governing valve (33) and second heat transfer governing valve (19) and plate heat exchanger (25) parallel connection.

6. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 5, wherein: pipe connection between different backpressure condensers (13), be provided with backpressure inlet end (15), backpressure drainage end (17), backpressure inlet end (14) and backpressure play liquid end (16) on backpressure condenser (13), backpressure inlet end (15) and steam turbine low pressure jar (8) pipe connection, the heat supply pipe network includes heat supply pipe network return water end (12) and heat supply pipe network water supply end (30), heat supply pipe network return water end (12) and backpressure inlet end (14) pipe connection, backpressure play liquid end (16) respectively with heat transfer inlet end (21) and first heat transfer import (27) pipe connection, first heat transfer export (26) and heat transfer play liquid end (23) all with heat supply pipe network water supply end (30) pipe connection.

7. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 6, wherein: still be provided with heat supply network circulating pump (18) between backpressure condenser (13) and heater (20), backpressure play liquid end (16) are through heat supply network circulating pump (18) respectively with heat transfer inlet end (21) and first heat transfer import (27) pipe connection.

8. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 1, wherein: the system further comprises an air cooling island (11), a branch pipeline is arranged between the steam turbine low-pressure cylinder (8) and the backpressure condenser (13), and the air cooling island (11) is arranged on the branch pipeline.

9. The electric boiler and start-up parallel thermal peak shaving system for a thermal power plant of claim 8, wherein: still be provided with the valve group in the system, the valve group includes second adjusting valve (2), third adjusting valve (3), fourth adjusting valve (4) and fifth adjusting valve (10), steam turbine intermediate pressure jar (1) is through second adjusting valve (2) and steam turbine low pressure jar (8) pipe connection, steam turbine intermediate pressure jar (1) is through third adjusting valve (3) and exhaust branch road pipe connection, fourth adjusting valve (4) set up on the communicating pipe way, and different high back pressure turbo generator set pass through fourth adjusting valve (4) pipe connection, and fifth adjusting valve (10) set up on the branch road pipeline, steam turbine low pressure jar (8) are through fifth adjusting valve (10) and air cooling island (11) pipe connection.

Technical Field

The invention belongs to the technical field of thermal power plants, and particularly relates to an electric boiler and first station parallel electric peak regulation system for a thermal power plant.

Background

The total wind power generation installation of the whole country at the end of 2019 is 2.1 hundred million kilowatts, and the wind power installation accounts for 10.4 percent of the total power generation installation. The photovoltaic power generation accumulation loading machine at the end of 2019 reaches 20430 ten thousand kilowatts, and the year-by-year increase is 17.3%. In the last half of 2019, 182 ten thousand kilowatts of hydropower grid-connected capacity are newly added in China. The installed capacity of the domestic power industry is continuously increased, wherein the installed capacity of new energy is rapidly increased, and particularly in the heating season of northern areas, as most units need to supply heat, the heat load limits the minimum output capacity of a thermal power unit, the new energy is difficult to generate in winter, and the power abandon rate is high. Therefore, a novel heating system is needed to meet the requirement of unit peak shaving auxiliary service in the heating season.

The peak shaving is that because the power load is uneven, when the power consumption is high, the power grid is always overloaded, at the moment, the power generation sets outside the normal operation need to be put into to meet the requirements, and the power generation sets are called peak shaving sets; the peak shaving unit is called as a peak shaving unit because the peak shaving unit is used for adjusting the peak of power utilization, the peak shaving unit is required to be convenient and quick to start and stop, synchronous adjustment is easy during grid connection, and the common peak shaving unit comprises a gas turbine unit and a pumped storage unit.

The electric energy can not be stored in large quantity, the generation and the use of the electric energy are synchronous, so the electric quantity is needed, the generation department must synchronously generate the electric quantity, the power load in the electric power system is changed frequently, and in order to maintain the balance of power consumption and power and keep the frequency of the system stable, the generation department needs to correspondingly change the output of the generator to adapt to the change of the power load

Thermal power plants generally employ high back pressure heat exchangers to recover cold end waste heat of low pressure cylinders of the thermal power plants for heating the heat supply network circulating water. Because the low-pressure cylinder has low exhaust steam pressure and limited heating capacity, the heat supply network circulating water is further heated to the water supply temperature of the heat supply network circulating water through steam extraction of a steam turbine in a heat supply network initial station. Because of the requirements of extraction pressure extraction temperature and high back pressure, the generating load of the unit is difficult to reduce, and generally more than 60% of the generating load is maintained, so that the generating load of the steam turbine is increased, and the thermoelectric peak regulation is not favorably and smoothly carried out.

Disclosure of Invention

In order to solve the technical problem, the invention provides an electric boiler and a first station parallel electric peak regulation system for a thermal power plant.

The specific scheme of the invention is as follows:

a thermoelectric peak regulation system that is used for parallelly connected of electric boiler and first station of steam power plant, including heat supply pipe network, turbine unit and backpressure condenser, the turbine unit is a set of at least, the backpressure condenser is one at least, and every turbine unit all includes steam turbine intermediate pressure jar and steam turbine low pressure jar, steam turbine intermediate pressure jar and steam turbine low pressure jar pipe connection, steam turbine low pressure jar with backpressure condenser pipe connection, be provided with the exhaust branch on the steam turbine intermediate pressure jar, still be provided with the UNICOM pipeline between the steam turbine intermediate pressure jar of different groups, be provided with high back pressure turbo generator set on the exhaust branch, different high back pressure turbo generator set pass through UNICOM pipeline pipe connection, be provided with the heater on high back pressure turbo generator set's the gas vent, the heater is one at least, heater and backpressure condenser pipe connection, the steam turbine set is electrically connected with the electric boiler heating system, the electric boiler heating system is connected with a backpressure condenser pipeline, and the backpressure condenser is connected with a heat supply pipe network pipeline.

The steam turbine set also comprises a first generator, the low-pressure cylinder of the steam turbine is rotationally connected with the first generator, and the first generator is electrically connected with the electric boiler heating system.

The high back pressure turbo generator set comprises a high back pressure steam turbine and a second generator, the high back pressure steam turbine is connected with the second generator in a rotating mode, a first adjusting valve is arranged on the high back pressure steam turbine, and different high back pressure steam turbines are connected with different heater pipelines through the first adjusting valve.

The electric boiler heating system comprises a plate heat exchanger, an electric boiler and a boiler water circulating pump, wherein the plate heat exchanger comprises a first heat exchange inlet, a second heat exchange inlet, a first heat exchange outlet and a second heat exchange outlet, the second heat exchange outlet is connected with an electric boiler pipeline, the electric boiler is connected with the boiler water circulating pump through a pipeline, the boiler water circulating pump is connected with the second heat exchange inlet through a pipeline, and the electric boiler is electrically connected with a first generator.

All be provided with first heat transfer governing valve on first heat transfer import and the first heat transfer export, be provided with heat transfer feed liquor end, heat transfer play liquid end, heat transfer inlet end and heat transfer drainage end on the heater, heat transfer feed liquor end and heat transfer play liquid all are provided with the second heat transfer governing valve on serving, the heater is through first heat transfer governing valve and second heat transfer governing valve and plate heat exchanger parallel connection.

Pipe connection between the different backpressure condensers, be provided with backpressure inlet end, backpressure drainage end, backpressure inlet end and backpressure liquid outlet end on the backpressure condenser, the backpressure inlet end is connected with steam turbine low cylinder pipe way, the heat supply pipe network includes heat supply pipe network return water end and heat supply pipe network water supply end, heat supply pipe network return water end and backpressure inlet end pipe connection, backpressure liquid outlet end is connected with heat transfer inlet end and first heat transfer inlet pipe way respectively, first heat transfer export and heat transfer liquid outlet end all with heat supply pipe network water supply end pipe connection.

Still be provided with the heat supply network circulating pump between backpressure condenser and the heater, backpressure play liquid end passes through the heat supply network circulating pump and is connected with heat transfer inlet end and first heat transfer inlet pipe respectively.

The system also comprises an air cooling island, a branch pipeline is arranged between the steam turbine low-pressure cylinder and the backpressure condenser, and the branch pipeline is provided with the air cooling island.

Still be provided with the valve group in the system, the valve group includes second regulating valve, third regulating valve, fourth regulating valve and fifth regulating valve, the steam turbine intermediate pressure jar passes through second regulating valve and steam turbine low pressure cylinder pipe connection, the steam turbine intermediate pressure jar passes through third regulating valve and is connected with exhaust branch road pipeline, fourth regulating valve sets up on the communicating pipe way, and different high back pressure turbo generator set passes through fourth regulating valve pipe connection, and fifth regulating valve sets up on the branch road pipeline, the steam turbine low pressure jar passes through fifth regulating valve and air cooling island pipe connection.

The invention discloses an electric boiler and a first station parallel electric peak regulation system for a thermal power plant, wherein a plurality of groups of turbines are adopted in the system, exhaust gas in the turbines exchanges heat with return water of a heat supply network in a condenser, the return water of the heat supply network after heat exchange further heats circulating water of the heat supply network through an electric boiler heating system which is connected in parallel, the electric boiler heating system replaces a unit to heat and extract steam, the power generation load of the turbines is effectively reduced, meanwhile, the electric boiler is electrically connected with a second generator, the electric boiler consumes the power generation of the turbines, the power supply load on the generator set can be reduced, and the purpose that the power generation load is reduced to participate in peak regulation auxiliary service in heating seasons under the condition of meeting the heat supply requirement is achieved.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the implementations of the present invention, and not all implementations, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any inventive work are within the scope of the present invention.

As shown in fig. 1, a thin solid line in fig. 1 indicates a water channel, a thick solid line indicates a cable, a broken line indicates a gas channel, a water flow flows through the water channel, a steam flows through the gas channel, and a current flows through the cable.

A parallelly connected thermoelectric peak regulation system of electric boiler and first station for steam power plant, including heat supply pipe network, turbine unit and backpressure condenser 13, the turbine unit is a set of at least, backpressure condenser 13 is one at least, and every turbine unit all includes steam turbine intermediate pressure cylinder 1 and steam turbine low pressure cylinder 8, steam turbine intermediate pressure cylinder 1 and 8 pipe connections of steam turbine low pressure cylinder, steam turbine low pressure cylinder 8 with backpressure condenser 13 pipe connection, be provided with the exhaust branch on the steam turbine intermediate pressure cylinder 1, still be provided with the UNICOM pipeline between the steam turbine intermediate pressure cylinder 1 of different groups, be provided with high back pressure turbo generator set on the exhaust branch, different high back pressure turbo generator set pass through UNICOM pipeline connection, be provided with heater 20 on high back pressure turbo generator set's the gas vent, heater 20 is one at least, heater 20 and backpressure condenser 13 pipe connection, the two ends of the heater 20 are also connected with at least one group of electric boiler heating systems in parallel, the steam turbine set is electrically connected with the electric boiler heating systems, the electric boiler heating systems are connected with the backpressure condenser 13 through pipelines, and the backpressure condenser 13 is connected with the heat supply pipe network pipeline.

A steam turbine is also called as a steam turbine engine, is a rotating machine which takes steam as power and converts the heat energy of the steam into mechanical work, is the most widely applied prime motor in the modern thermal power plant, is a rotary steam power device, high-temperature high-pressure steam passes through a fixed nozzle to become accelerated airflow and then is sprayed on blades, so that a rotor provided with blade rows rotates and does work outwards.

The steam turbine can be divided into a high pressure cylinder, a medium pressure cylinder and a low pressure cylinder according to the working characteristics.

The high pressure cylinder of the steam turbine is the initial stage of main steam entering the cylinder, and the steam pressure is high and the temperature is high at the moment, so that the corresponding high pressure cylinder has short blades and large diameter of the impeller. Generally, a turbine intermediate pressure cylinder, a turbine high pressure cylinder and a turbine low pressure cylinder are arranged in parallel, and the difference is the difference of internal pressure.

The back pressure condenser 13 is a heat exchanger which can be used for condensing the exhaust cold energy of the steam turbine into water, the condenser can be used for condensing the exhaust of the steam turbine into water, and can also be used for establishing vacuum and maintaining vacuum at the exhaust position of the steam turbine, the back pressure condenser 13 can be used for improving the vacuum of the condenser and reducing the exhaust pressure of the steam turbine, and therefore the efficiency of the steam turbine is improved.

In this embodiment, the turbine units are preferably two sets, the back pressure condensers 13 are preferably two, the two heaters 20 are preferably provided, two sets of the turbine units are connected in parallel, the two back pressure condensers 13 are connected in series, the two heaters are connected in parallel, specifically, the exhaust gas discharged by the steam turbine low pressure cylinder 8 is condensed into water in the backpressure condenser 13, the exhaust gas is low-temperature steam which is not polluted and is carried in high-temperature condensed water discharged by indirect steam equipment, the process of condensing the exhaust gas into water in the backpressure condenser 13 is a heat release process, the return water in the heat supply pipe network can be introduced into the backpressure condenser 13 at the moment, the water in the heat supply pipe network exchanges heat in the backpressure condenser 13, the temperature of the water in the heat supply pipe network is improved, meanwhile, exhaust gas exhausted from the steam turbine low-pressure cylinder 8 is effectively utilized, and waste heat exhausted from the steam turbine low-pressure cylinder 8 is used for heating water in a heat supply network pipeline.

In this embodiment, a high back pressure generator set is further used to extract air from the steam turbine intermediate pressure cylinder 1, and the high back pressure generator set exchanges heat with water in the heat supply network pipe again through the heater 20, so that the water temperature in the heat supply network pipe is increased.

Simultaneously, the electric boiler heating system in this embodiment also can heat the water in the heat supply pipe network, further promotes the temperature in the heat supply pipe network for can effectively promote the temperature in the heat supply pipe network.

In the actual working process, if the peak shaving requirement exists, the high back pressure generating set can stop pumping air from the steam turbine intermediate pressure cylinder 1, only the boiler heating system is adopted to heat water in a heat supply pipe network, the electric boiler heating system is adopted to replace pumping air in the steam turbine intermediate pressure cylinder 1, at the moment, the air pumping amount in the steam turbine intermediate pressure cylinder 1 is zero, the power generation load of a steam turbine is reduced, in the embodiment, the electric boiler heating system is also electrically connected with the steam turbine set, the electric boiler heating system consumes the power generated by the steam turbine set, therefore, the power load on the power grid of the power grid can be further reduced, the power load on the power grid of the power grid is reduced under the condition of meeting the heat supply requirement, meanwhile, the system participates in the peak shaving auxiliary service in winter, the peak shaving capacity of the steam turbine set is increased, and the consumption capacity of a power grid to new energy is increased, the profitability of the unit is improved, the on-line electric load is the power supply load borne by the power plant to the power grid, namely the load transmitted to the line is called the on-line electric load.

The steam turbine set further comprises a first generator 9, the steam turbine low-pressure cylinder 1 is rotatably connected with the first generator 8, and the first generator 9 is electrically connected with the electric boiler heating system.

The generator is a mechanical device which converts other forms of energy into electric energy, can be driven by a water turbine, a steam turbine, a diesel engine or other power machines, converts energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy to be transmitted to the generator, and then converts the mechanical energy into the electric energy by the generator.

The high back pressure turbo generator set comprises a high back pressure steam turbine 5 and a second generator 6, the high back pressure steam turbine 5 is rotatably connected with the second generator 6, a first regulating valve 7 is arranged on the high back pressure steam turbine 5, and different high back pressure steam turbines 5 are connected with different heaters 20 through the first regulating valve 7.

The high back pressure steam turbine 5 is a steam turbine with exhaust pressure greater than atmospheric pressure, the high back pressure steam turbine has high exhaust pressure and small enthalpy drop of steam, and compared with a steam turbine with very low exhaust pressure, the high back pressure steam turbine can emit the same power and has large required steam quantity, heat contained in the exhaust steam of the high back pressure steam turbine can be supplied to a heat user, no cold source loss exists, and therefore, the heat utilization coefficient of fuel is considered, and the heat efficiency of the high back pressure steam turbine is high.

In this embodiment, high back pressure steam turbine 5 is connected with 1 pipe connection of steam turbine intermediate pressure cylinder through the exhaust branch road, high back pressure steam turbine 5 can be followed steam turbine intermediate pressure cylinder 1 and bled, and back high back pressure steam turbine 5 of bleeding can drive second generator 6 and generate electricity, the exhaust of high back pressure steam turbine 5 also can be carried to in the heater 20, carries out the heat exchange with the water of heat supply pipe network in the heater 20, improves the temperature of water in the heat supply pipe network, can satisfy the heat demand of festival when heating winter.

The first regulating valve 7 is disposed at an exhaust port of the high back pressure turbine 5, and the first regulating valve 7 can regulate the amount of steam entering the heater 20, and also can stop the high back pressure turbine 5 from delivering steam to the heater 20 by closing the first regulating valve 7.

The first regulating valve 7 can adopt a stop valve or a butterfly valve, the stop valve is also called a stop valve and is one of the most widely used valves, and the stop valve is durable due to small friction force between sealing surfaces in the opening and closing process, small in opening height, easy to manufacture, convenient to maintain, suitable for medium and low pressure and high pressure, and realizes the functions of medium conveying, stopping, regulating and the like.

The butterfly valve, also called a flap valve, is a valve which is opened and closed by rotating around a valve shaft, and is a regulating valve with a simple structure, the butterfly valve has the advantages of simple structure, small volume, light weight, material consumption saving, small installation size, small driving moment, simplicity and rapidness in operation, and good flow regulation function and closing and sealing characteristics, and the first regulating valve 7 is preferably a butterfly valve in the embodiment.

Electric boiler heating system includes plate heat exchanger 25, electric boiler 29 and stove water circulating pump 28, plate heat exchanger 25 includes first heat transfer import 27, second heat transfer import 32, first heat transfer export 26 and second heat transfer export 31, second heat transfer export 31 and electric boiler 29 pipe connection, electric boiler 29 and stove water circulating pump 28 pipe connection, stove water circulating pump 28 and second heat transfer import 32 pipe connection, electric boiler 29 is connected with first generator 9 electricity.

The plate heat exchanger 25 is a high efficiency heat exchanger formed by stacking a series of corrugated metal sheets. Thin rectangular channels are formed between the various plates in the plate heat exchanger 25 through which heat is exchanged. The plate heat exchanger is an ideal device for heat exchange of liquid-liquid and liquid-vapor. The heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, wide application, long service life and the like. Under the condition of the same pressure loss, the heat transfer coefficient of the heat exchanger is 3-5 times higher than that of the tubular heat exchanger, the floor area of the heat exchanger is one third of that of the tubular heat exchanger, and the heat recovery rate is higher.

Electric boiler 29 also is called electric heating boiler, electric boiler, utilizes resistance to generate heat or electromagnetic induction generates heat, when the heat transfer position through the boiler heats hot medium water or organic heat carrier to uniform temperature and pressure, outwards exports a heat energy mechanical equipment that has rated working medium, electric boiler 29 is structurally easily superpose the combination, and control is nimble, and factor of safety is higher, maintains convenient beneficial effect of change, in this embodiment, electric boiler 29 preferably adopts electromagnetic induction to generate heat and heats.

The water heated in the electric boiler 29 can be delivered to the plate heat exchanger 25 through the boiler water circulating pump 28, and the water heated by the electric boiler 29 in the plate heat exchanger 25 exchanges heat with the water of the heat supply pipe network.

The electric boiler 29 is electrically connected to the first generator 9, as shown in fig. 1, which shows a cable in a thick implementation, and the electric energy generated in the first generator 9 is transmitted to the electric boiler 29 through the cable to provide electric energy for the electric boiler 29 to heat water. The electric boiler 29 consumes the generated electric energy in the first generator 9, which may reduce the on-grid electric load of the first generator 9.

After electric boiler 29 got the electricity, heat the water in electric boiler 29 through electromagnetic induction, after heating required temperature, stove water circulating pump 28 is gone into the water in electric boiler 29 and is gone into plate heat exchanger 25 with high-temperature water pump through second heat transfer import 32, and high-temperature water is after the heat transfer in plate heat exchanger 25, and the temperature reduces, and the water after the cooling flows back to electric boiler 29 through second heat transfer export 31 once more and heats to required temperature to carry out next heat exchange.

All be provided with first heat transfer governing valve 33 on first heat transfer import 27 and the first heat transfer export 26, be provided with heat transfer inlet end 21, heat transfer play liquid end 23, heat transfer inlet end 22 and heat transfer drainage end 24 on the heater 20, all be provided with second heat transfer governing valve 19 on heat transfer inlet end 21 and the heat transfer play liquid end 23, heater 20 is through first heat transfer governing valve 33 and second heat transfer governing valve 19 and plate heat exchanger 25 parallel connection, in this embodiment, first heat transfer governing valve 33 and second heat transfer governing valve 19 are the preferred butterfly valve.

Steam discharged by the high-back-pressure steam turbine 5 is conveyed into the heat exchanger 20 through the heat exchange air inlet end 22, the steam exchanges heat with heat supply network backwater flowing in from the heat exchange air inlet end 21 in the heat exchanger 20, the temperature of the heat supply network backwater rises after heat exchange, and the rising water temperature enters the heat supply network again through the heat exchange water discharge end 24 to supply heat for heat users again; the steam entering the heat exchanger 20 is cooled and condensed into water after heat exchange, and the condensed water flows out from the heat exchange liquid outlet end 23.

Pipe connection between different backpressure condensers 13, backpressure inlet end 15, backpressure drainage end 17, backpressure inlet end 14 and backpressure play liquid end 16 are provided with on the backpressure condenser 13, backpressure inlet end 15 and 8 pipe connection of steam turbine low pressure cylinder, the heat supply pipe network includes heat supply pipe network return water end 12 and heat supply pipe network water supply end 30, heat supply pipe network return water end 12 and the 14 pipe connection of backpressure inlet end, backpressure play liquid end 16 respectively with heat transfer inlet end 21 and the 27 pipe connections of first heat transfer import, first heat transfer export 26 and heat transfer play liquid end 23 all with heat supply pipe network water supply end 30 pipe connection.

A heat supply network circulating pump 18 is further arranged between the backpressure condenser 13 and the heater 20, and the backpressure liquid outlet end 16 is respectively connected with a heat exchange liquid inlet end 21 and a first heat exchange inlet 27 through the heat supply network circulating pump 18.

The exhausted gas discharged from the turbine low-pressure cylinder 8 is conveyed to the backpressure condenser 13 through the backpressure air inlet end 15, the backpressure condenser 13 condenses the exhausted gas into liquid and discharges the condensed liquid through the backpressure water discharge end 17, the process of condensing the exhausted gas into liquid is a heat release process, in the backpressure condenser 13, water in the heat supply pipe network water return end 12 flows into the backpressure condenser 13 through the backpressure liquid inlet end 14 to complete heat exchange, the heated water flows out of the liquid outlet end 16 through backpressure, and is conveyed to the heat exchange liquid inlet end 21 and the first heat exchange inlet 27 pipeline, the heated water is subjected to heat exchange with the heater 20 or the plate type heat exchanger 25 again through adjusting the opening or closing of the first heat exchange adjusting valve 33 and the second heat exchange adjusting valve 19, and the water temperature is further increased.

In the present embodiment, it is preferable to condense the exhaust gas discharged from the turbine low-pressure cylinder 8 by connecting two back-pressure condensers 13 in series.

The system further comprises an air cooling island 11, a branch pipeline is arranged between the steam turbine low-pressure cylinder 8 and the backpressure condenser 13, and the air cooling island 11 is arranged on the branch pipeline. The air cooling island 11 comprises a plurality of cooling fans, and redundant exhaust gas can be cooled through the air cooling island 11.

Still be provided with the valve group in the system, the valve group includes second adjusting valve 2, third adjusting valve 3, fourth adjusting valve 4 and fifth adjusting valve 10, steam turbine intermediate pressure jar 1 is through second adjusting valve 2 and 8 pipe connections of steam turbine low pressure jar, steam turbine intermediate pressure jar 1 is through third adjusting valve 3 and exhaust branch road pipe connection, fourth adjusting valve 4 sets up on the communicating pipe way, and different high back pressure turbo generator set passes through fourth adjusting valve 4 pipe connection, and fifth adjusting valve 10 sets up on the branch road pipeline, steam turbine low pressure jar 8 is through fifth adjusting valve 10 and 11 pipe connections in air cooling island.

The second control valve 2, the third control valve 3, the fourth control valve 4 and the fifth control valve 10 are preferably butterfly valves.

The second regulating valve 2 can regulate the circulating steam flow between the steam turbine intermediate pressure cylinder 1 and the steam turbine low pressure cylinder 8, the third regulating valve 3 can regulate the air extraction amount of the steam turbine intermediate pressure cylinder 1, and the fourth regulating valve 4 can regulate the steam flow flux between different steam turbine units.

The specific working process of the electric boiler and the first-station parallel thermoelectric peak regulation system of the thermal power plant is as follows:

when the peak regulation auxiliary service is not needed, the system normally operates, the return water at the heat supply pipe network return water end 12 firstly enters the backpressure condenser 13 for heat exchange, the heat exchange steam adopts partial steam exhaust of the steam turbine low-pressure cylinder 8, the system comprises two backpressure condensers 13, firstly carries out heat exchange in the first high-backpressure condenser 13, and enters the second backpressure condenser for continuous heat exchange after the heat exchange is completed. The backwater heated by the backpressure condenser enters the heater 20, and the backwater of the heat supply network is heated to the required temperature by extracting the exhaust steam of the steam turbine intermediate pressure cylinder 1 in the heater 20 and then is output to the water supply end 30 of the heat supply network for supplying heat for heat users.

When the peak shaving auxiliary service is required, the first regulating valve 7 and the second heat exchange regulating valve 19 are first closed, and the opening degree of the third regulating valve 3 is reduced, so that a small amount of steam can be delivered from the turbine intermediate pressure cylinder 1 to the high back pressure turbine 5. At this time, the steam extraction amount of the steam turbine intermediate pressure cylinder 1 is reduced, the output of the heater 20 is reduced, but the temperature of circulating water in the heat supply pipe network is reduced, so that the heat supply requirement is not met, at this time, the first heat exchange regulating valve 33 is opened, the electric boiler 29 is started, the boiler water circulating pump 28 is opened, and the electric boiler 29 obtains electric energy from the first generator 9. The electric boiler 29 heats the boiler water and circulates it through the boiler water circulation pump 28, while releasing heat in the plate heat exchanger 25, which heats the circulating water in the heat supply network.

In the system, the steam inlet amount and the water inlet amount on the heater 20 are adjusted by adjusting the opening degrees of the first regulating valve 7 and the second heat exchange regulating valve 19 on the heater 20, the water inlet amount of the plate heat exchanger 25 is adjusted by adjusting the opening degree of the first heat exchange regulating valve 33 to adjust the heat distribution of steam extraction heating and electric boiler heating, and in actual work, flexible peak regulation can be realized through the opening degrees of the first regulating valve 7, the second heat exchange regulating valve 19 and the first heat exchange regulating valve 33 according to the requirement of peak regulation auxiliary service.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.