阅读说明：本技术 一种烟气消白耦合海水淡化的能量综合利用方法及系统 (A kind of flue gas disappears the total energy approach method and system of white coupling sea water desalination ) 是由 马贵林 陈思同 于 2019-09-17 设计创作，主要内容包括：本发明提供一种烟气消白耦合海水淡化的能量综合利用方法及系统,主要包含火电厂热力系统、消白取热系统、低温海水淡化系统。锅炉排出的烟气依次经过除尘器、脱硫塔后进入冷却器,烟气中90％以上水蒸气冷凝析出,然后经烟囱排放,实现脱硫烟气消白。锅炉产生的主蒸汽经汽轮机做功后排入凝汽器,凝汽器采用海水冷却,海水升温后大部分排回大海,少部分海水经处理后送入海水淡化预加热系统,最后进入低温多效蒸发模块产生淡水。低温多效蒸发所需要的低温热源由消白取热系统中热泵提供,热泵驱动热源来自于汽轮机低温抽气。本发明有机地结合了烟气消白提水和海水淡化两种工艺,将其巧妙组合于一体,实现环保和节能双重效益,具有广泛运用前景。(The present invention provides the total energy approach method and system that a kind of flue gas disappears white coupling sea water desalination, mainly comprising Thermal System of Fossil Fuel-Fired Power Station, disappearing white takes hot systems, low temperature seawater desalination system.The flue gas of boiler discharge successively enters cooler after deduster, desulfurizing tower, and it is white to realize that desulfurization fume disappears then through smoke stack emission for 90% or more vapor condensation in flue gas.The main steam that boiler generates is discharged into condenser after steam turbine does work, and condenser is cooling using seawater, largely flows back to sea after seawater heating, and small part seawater is sent into sea water desalination preheating system after processing, finally enters low-temperature multi-effect evaporation module and generates fresh water.Low-temperature heat source required for low-temperature multi-effect evaporates by disappear it is white take in hot systems heat pump to provide, heat pump driving heat source is from steam turbine cryogenic pumping.The present invention organically combines flue gas and disappears two kinds of techniques of white water lift and sea water desalination, by its it is ingenious be combined in one, realize environmental protection and energy saving double benefit, have been widely used prospect.)

A kind of method of the total energy approach of white coupling sea water desalination 1. flue gas disappears, it is characterised in that:

The flue gas that boiler (14) is discharged in therrmodynamic system is followed by deduster (15) dedusting, desulfurizing tower (16) desulfurization, after desulfurization Wet saturated flue gas enter gas cooler (1) carry out condensation dehydration disappear it is white, finally enter chimney (17) outward discharge；

The cold source of gas cooler (1) is the chilled water provided by the cold end of lithium bromide heat pump unit (3), in wet saturated flue gas The condensed water that vapor and chilled water are formed after heat exchange in gas cooler (1) enters low temperature seawater desalination system and finally flows Enter fresh-water tank (13)；Chilled water heat absorption is recycled back to lithium bromide heat pump unit, and the hot water that lithium bromide heat pump unit hot end generates then is made The work of low temperature seawater desalination system is driven for heat source, fresh water is generated, realizes the recycling of fume waste heat and water；

Main steam driving steam turbine (18) power generation that boiler (14) generates, the lack of gas of generation are discharged into condenser (20) and are condensed, Condenser (20) as cold source, is heated up using seawater after Absorption by Sea Water lack of gas latent heat, and the seawater after heating is divided into two parts, and one Divide discharge, another part is successively sent to level-one pre-heater (5) and second level preheating after sea water preprocessing device (29) are handled Device (6), the seawater after heating are sent to the evaporation module of the low-temperature multi-effect in low temperature seawater desalination system and carry out desalt processing；

The driving heat source of the lithium bromide heat pump unit (3) uses steam turbine (18) steam extraction, and steam extraction is condensed hydrophobic as heat Second level pre-heater (6) are sent in source, are finally drawn back by condenser (20) back pressure hydrophobic；Lithium bromide heat pump unit (3) hot end generates Hot water be sent to low temperature seawater desalination system through hot water circulating pump (7), as heat source driving low-temperature multi-effect evaporation module carry out sea Water evaporation, hot water flow through low-temperature multi-effect evaporation module one effect low-temperature evaporation module (8) after be recycled back to lithium bromide heat pump unit (3) Hot end；The hot fresh water that evaporation of seawater generates successively flows into next effect low-temperature evaporation module and level-one pre-heater as heat source (5) heating seawater in is flowed into fresh-water tank (13) after discharging its own sensible heat；High salinity concentrated seawater is steamed from low-temperature multi-effect The concentrated seawater for sending out module exports outflow.

The energy comprehensive utilization system of white coupling sea water desalination 2. a kind of flue gas disappears, it is characterised in that: the system comprises thermoelectricitys Factory's therrmodynamic system, disappearing white takes three hot systems, low temperature seawater desalination system parts；

The therrmodynamic system include boiler (14), steam turbine (18), condenser (20), feed pump (19), circulating pump room (21), Deduster (15), desulfurizing tower (16), gas cooler (1) and chimney (17)；The smoke outlet and deduster of the boiler (14) (15) entrance connection, the outlet of deduster (15) are connect with the entrance of desulfurizing tower (16), and desulfurizing tower (16) outlet is cold with flue gas But the smoke inlet connection of device (1), the exhanst gas outlet of gas cooler (1) are connect with chimney (17)；Boiler (14) and steam turbine (18) the lack of gas outlet of steam inlet connection, steam turbine (18) is connect with condenser (20) entrance, the condensation of condenser (20) Water out is connected with the water inlet of feed pump (19), and the water outlet of feed pump (19) is connected with the water inlet of boiler (14)； Condenser (20) cooling water is connected for water return pipeline with circulating pump room (21)；

It is described disappear it is white take hot systems include lithium bromide heat pump unit (3), refrigerant circulation pump (2)；The lithium bromide heat pump unit (3) Including cold side conduits and hot side conduit, the cold side conduits include cold source outlet and cold source entrance, and the hot side conduit includes heat Source outlet and thermal source inlet；The cold source outlet of lithium bromide heat pump unit (3) is cold with gas cooler described in therrmodynamic system (1) Source inlet is connected, and the cold source outlet of gas cooler (1) is connected with the entrance of refrigerant circulation pump (2), the refrigerant circulation pump (2) outlet is connected with the cold source entrance of lithium bromide heat pump unit (3)；

The low temperature seawater desalination system includes seawater pretreatment system, level-one pre-heater (5), second level pre-heater (6), low Warm multiple-effect evaporation module, steam condenser (12), fresh-water tank (13), hot water circulating pump (7), seawater booster pump (4)；Therrmodynamic system Described in condenser (20) backwater outlet connect with the entrance of sea water preprocessing device (29), the sea water preprocessing device (29) Water outlet be connected with the water inlet of seawater booster pump (4), the water outlet of seawater booster pump (4) and level-one pre-heater (5) Seawater inlet is connected；The seawer outlet of the level-one pre-heater (5) is connected with the seawater inlet of second level pre-heater (6), and two The seawer outlet of grade pre-heater (6) is connected with the seawater inlet of low-temperature multi-effect evaporation module, and low-temperature multi-effect evaporates the steaming of module Vapor outlet is connected with the steam inlet of steam condenser (12), and low-temperature multi-effect evaporates the water outlet and level-one pre-heater of module (5) fresh water entrance is connected, and the water outlet of level-one pre-heater (5) is connected with the water inlet of fresh-water tank (13)；

Disappear the white driving steam condensation water discharge spout mouth for taking lithium bromide heat pump unit described in hot systems (3) and second level pre-heater (6) hydrophobic entrance connection, the hydrophobic outlet of the second level pre-heater (6) is connect with the hydrophobic entrance of condenser (20)；Institute The thermal source outlet for stating lithium bromide heat pump unit (3) is connected with the hot water inlet of hot water circulating pump (7), the heat of hot water circulating pump (7) Water out is connected with the thermal source inlet of low-temperature multi-effect evaporation module, and low-temperature multi-effect evaporates the thermal source outlet and lithium bromide heat pump of module The thermal source inlet of unit (3) is connected, to form hot water circuit.

The energy comprehensive utilization system of white coupling sea water desalination 3. flue gas as claimed in claim 2 disappears, it is characterised in that: described Disappear it is white take hot systems be directly disappear it is white take hot systems, it is described directly to disappear that white to take hot systems further include settling tank (24), technique water tank (26), condensate water discharge pump (27), sludge discharge pump (25), blast cap pallet (23), the gas cooler (1) be directly disappear it is white Cooler；The cold source outlet of the lithium bromide heat pump unit (3) is connected with the white cooler spraying layer (2201) that directly disappears, and directly disappears White cooler bottom is blast cap pallet (23), and the outlet of blast cap pallet (23) is connected with the entrance of settling tank (24), settling tank (24) outlet includes supernatant liquor outlet and lower layer's sludge outlet, and supernatant liquor exports the entrance phase with technique water tank (26) Even, lower layer's sludge outlet is connected with the entrance of sludge discharge pump (25), the outlet of sludge discharge pump (25) and desulfurization pulping system (30) entrance is connected；The outlet of the technique water tank (26) includes first outlet and second outlet, the first outlet with it is cold The entrance of matchmaker's circulating pump (2) is connected, and the outlet of refrigerant circulation pump (2) is connected with the cold source entrance of lithium bromide heat pump unit (3), work The second outlet of skill water tank (26) is connected with the entrance of condensate water discharge pump (27), the outlet of condensate water discharge pump (27) and low temperature The entrance of seawater booster pump described in seawater desalination system (4) is connected.

The energy comprehensive utilization system of white coupling sea water desalination 4. flue gas as claimed in claim 2 disappears, it is characterised in that: described Disappear it is white take hot systems be disappear indirectly it is white take hot systems, it is described to disappear that white to take hot systems further include settling tank (24), technique water tank indirectly (26), condensate water discharge pump (27), sludge discharge pump (25), blast cap pallet (23), expansion tank (28) described gas cooler It (1) is the white cooler that disappears indirectly；Lithium bromide heat pump unit (3) the cold source outlet and the white cooler heat exchange coil that disappears indirectly (2202) it is connected, white cooler heat exchange coil (2202) outlet that disappears indirectly is connected with the entrance of refrigerant circulation pump (2), refrigerant circulation The outlet of pump (2) is connected with the cold source entrance of lithium bromide heat pump unit (3), and disappear white cooler heat exchange coil (2202) and cold indirectly Expansion tank (28) are connected between matchmaker's circulating pump (2)；Disappear indirectly white cooler bottom be blast cap pallet (23), blast cap pallet (23) outlet is connected with the entrance of settling tank (24), and the outlet of settling tank (24) includes that supernatant liquor outlet and lower layer's sludge go out Mouthful, supernatant liquor outlet is connected with the entrance of technique water tank (26), the entrance phase of lower layer's sludge outlet and sludge discharge pump (25) Even, the outlet of sludge discharge pump (25) is connected with the entrance of desulfurization pulping system (30), the outlet and condensation of technique water tank (26) The entrance of water discharge pump (27) is connected, seawater boost described in the outlet of condensate water discharge pump (27) and low temperature seawater desalination system The entrance for pumping (4) is connected.

The energy comprehensive utilization system of white coupling sea water desalination 5. flue gas as described in claim 3 or 4 disappears, it is characterised in that: The gas cooler (1) is located at desulfurization column overhead, the inlet of chimney (17).

The energy comprehensive utilization system of white coupling sea water desalination 6. flue gas as claimed in claim 2 disappears, it is characterised in that: described The effect number of low-temperature multi-effect evaporation module is 3 effects -8 effect.

Technical field

The present invention relates to environmental protection and energy saving fields, and in particular to a kind of flue gas disappears the total energy approach of white coupling sea water desalination Method and system.

Background technique

Active service coal-fired plant boiler flue gas desulfurization workshop section generallys use wet desulphurization, and (such as limestone-gypsum method, seawater are de- Sulphur, ammonia process, Dual alkali etc.), flue gas can satisfy SO after absorption tower is washed₂Qualified discharge, but high-temperature flue gas is washed simultaneously On absorption tower, outlet will form wet saturated flue gas afterwards.The fine solid particle to escape is inevitably carried in wet saturated flue gas (such as gypsum powder, coal ash, calcium carbonate powder) and a large amount of steam are discharged into greatly with the fine solid particle that saturated flue gas is escaped through chimney Gas will form secondary pollution, and the vapor in flue gas can be condensed into fine drop in high-altitude and Cold air mass influence, and be formed long White plume.In the Yangtze River Delta, Beijing-tianjin-hebei Region, to be reached as Shanghai, Zhejiang Province have put into effect related provision requirement exhaust emissions source To the white rear discharge that disappears.Currently, flue gas disappears, there are mainly three types of process flows, (1) heating process to directly heat flue gas for white technique Certain temperature, about 25 DEG C -40 DEG C of temperature rise, so that the vapor in flue gas is in an overheated state, it can be achieved that take off white discharge, it is such Process requirement consumes a large amount of thermal energy.(2) flue gas is carried out depth cooling by condensation process, and being typically cooled to 35 DEG C or less, (temperature drop is about 15 DEG C -20 DEG C), a large amount of vapor in flue gas can condense (condensation water quantity accounts for about 60%-70%), and such process requirement disappears More cooling capacity is consumed, steam gasification latent heat wastes in flue gas.(3) condensation-heating process first carries out flue gas preliminary pre- Cold, flue gas cooling range is smaller, about 5 DEG C -7 DEG C, then heats flue gas, and heating amplitude is also smaller, and about 15 DEG C -20 of temperature rise ℃.Flue gas is superheat state after heating, can achieve and takes off white discharge.The process system is complicated, need to be arranged flue gas heating system, Flue-gas-cooling system, machine power Tower System etc..

On the other hand, freshwater resources are insufficient at present, and coastal area is equipped with more desalinator, desalination process kind Class is more, mainly includes thermal method, embrane method and chemical method three categories.Wherein thermal method mainly includes multistage flash distillation, multiple-effect evaporation and pressure Steam distillation etc., embrane method mainly includes reverse osmosis and electrodialysis etc., and chemical method mainly uses ion-exchange and hydrate. Multistage flash distillation, multiple-effect evaporation and the reverse osmosis technology for being wherein suitable for enlargement are most competitive, respectively there is more commercialization case. Multiple-effect evaporation belongs to traditional desalination process, can trace back to 1840s, early stage multiple-effect evaporation work earliest Skill is since fouling is serious, energy consumption is high, the existing trend replaced by low-temperature multi-effect evaporation technology.Low-temperature multi-effect evaporation technology highest is steamed It sends out temperature and is no more than 80 DEG C, water generation ratio is up to 5.5-8.By taking the odd-numbered day makes water 20000t/h desalinator as an example, low temperature Steam consumption quantity is about 140t/h, and steam consumption quantity is larger.

It is retrieved, there is utility model patent number CN207608447U, which provides a kind of thermal power plant heat Film couples seawater desalination system, and the system combines two kinds of techniques of low temperature seawater desalination system and embrane method processing system, first It will be sent into low-temperature multi-effect evaporation after sea water preprocessing and generate fresh water, then further produce concentrated water feeding embrane method processing system Water improves seawater utilization rate.This kind of system of identical water yield can suitably reduce heat source stream consumption, but concentrated seawater is sent into Full film processing system, it is unfavorable to run to film itself, reduces its service life.Secondly, membranous system needs regular backwash to protect The normal water flux of film is demonstrate,proved, frequently backwash also further increases clean water consumption.

Have Chinese invention CN109160563A again, the invention provides one kind based on vapor supplementary set in coal steam-electric plant smoke with The seawater desalination system of waste heat recycling, the system main innovation point has two o'clock, first, being that water-borne formula cigarette is arranged before absorption tower Gas Cooler Mist heat recovering goes seawater desalination system to generate fresh water with the hot water after heating.Second, being cold provided with flue gas But device is reduced into adsorption tower smoke temperature, and the evaporation capacity on such absorption tower is reduced, and water resources consumption is reduced.But the system Absorption tower real standard weighing apparatus problem is considered, because wet desulphurization absorption tower moisturizing mainly passes through the shape that mist eliminator flushing sprays Formula moisturizing into absorption tower is reduced into tower flue gas temperature, and tower evaporation capacity is reduced, then means the reduction of mist eliminator flushing water, remove The reduction of day with fog washing water quantity will cause multi-stage demister blockage problem.Operating experience through desulfurization industry these years, now in the industry Reach common understanding, that is, entering tower flue gas temperature cannot be below 90 DEG C (fired power generating units).In addition, seawater low temperature desalinating process needs low temperature Heat source temperature cannot be below 85 DEG C, and in order to guarantee that gas cooler has heat exchange temperature and pressure appropriate, absorption tower enters tower temperature degree cannot be low In 95 DEG C.Boiler export flue gas saturation temperature is about 38 DEG C -45 DEG C, and system does not receive outlet capacity.Therefore, the system flue gas Cooler is only capable of the sensible heat of recovery section flue gas, and flue-gas temperature is reduced to from 135 DEG C after deduster by taking separate unit 300MW unit as an example 95 DEG C, reduced temperature is only 40 DEG C, and recycling sensible heat is about 58369500kJ/h.Consider according to water generation ratio 8, then one day production water Amount is 4872 tons, and water yield is less.

There is Chinese invention CN108458334A again, the invention provides a kind of novel thermal power plant's low temperature heat and disappears white The device and method of cigarette, described device mainly export one gas cooler of setting on absorption tower, with water-borne cooling, the part by flue gas Condensate moisture in flue gas is got off, and it is white to realize that flue gas disappears.Meanwhile the water-borne temperature for flowing through cooler increases, with raising temperature Hot water goes to heat primary/Secondary Air, and excess heat is then scattered in air by cooling tower, realizes part tow taste heat recycling benefit With.Dedicated gas cooler is arranged in device needs outside absorption tower, takes up an area larger.And it is small to flue gas cooling range, usually 40 DEG C -48 DEG C can only be cooled to, and for northern coal-burning power plant, winter situation is unable to satisfy flue gas and disappears white discharge.

Based on above-mentioned status, needs to design a kind of coal steam-electric plant smoke that can either meet and disappear the requirement of white discharge, and can offset The system that the latent heat of flue gas and water are recycled during white, such as thermal energy and water are used in seawater desalination system, it can While carrying out environmental protection, to improve the utilization rate of the energy.

Summary of the invention

It is an object of that present invention to provide a kind of flue gas disappear it is white coupling sea water desalination total energy approach method and system, solution Secondary pollution caused by the current heat-engine plant desulfurized rear wet saturated flue gas formed of having determined is discharged into atmosphere, while also solving at present Flue gas disappear it is white during a large amount of heat or cooling capacity needed according to technique difference, while heat in flue gas and water also result in it is huge The problem of big energy waste；Furthermore the needs of problems in low temperature seawater desalination system to steam is also reduced.

To reach above-mentioned purpose, the following technical solutions are proposed by the present invention: a kind of flue gas disappears the energy of white coupling sea water desalination The method of comprehensive utilization, the flue gas of boiler discharge is followed by deduster dedusting, desulfurizing tower desulfurization in therrmodynamic system, after desulfurization Wet saturated flue gas enters gas cooler, and wet saturated flue gas cools down, deeply in cooler and water-borne directly or indirectly contact completion Degree dehydration, discharged outward eventually by chimney, about 15 DEG C of smog discharge temperature, realize flue gas disappear it is white；Chilled water in cooler It is then provided by lithium bromide heat pump unit cold end, chilled water temperature is about 7 DEG C, and the vapor and chilled water in wet saturated flue gas are in cigarette Heat exchange forms condensed water and enters low temperature seawater desalination system and finally flow into fresh-water tank in Gas Cooler, and chilled water is inhaled in cooler It is warming up to 25 DEG C after heat, and transfers heat to lithium bromide heat pump unit, the hot water that lithium bromide heat pump unit hot end generates then is made The work of low temperature seawater desalination system is driven for heat source, fresh water is generated, realizes the recycling of fume waste heat and water.

The main steam driving steam turbine power generation that boiler generates, lack of gas are discharged into condenser after acting, and condenser is made using seawater It is cooled down, is heated up after the cooling latent heat generated of Absorption by Sea Water lack of gas, the seawater after heating is divided into two parts, a part for cold source Sea is flow back to, another part is sent to level-one pre-heater, the high-temperature water of level-one pre-heater after the processing of sea water preprocessing device Water is produced from each effect sea water desalination module, each module produces about 45 DEG C of water final temperature, and level-one pre-heater, which mainly recycles, produces water portion Divide sensible heat；Seawater is flowed into about 45 DEG C -55 DEG C of seawater after second level pre-heater heats again from level-one pre-heater, is then sent Desalt processing is carried out to seawater into low-temperature multi-effect evaporation module.

Lithium bromide heat pump unit driving heat source uses 6 sections of steam extractions of steam turbine, hydrophobic after steam extraction condensation that heat source is used as to be sent to two Grade pre-heater is drawn back hydrophobic, recycling of the completion to hydrophobic (about 110-160 DEG C) sensible heat by back pressure of condenser, while Reduce the high temperature impact to condenser.

The hot water that lithium bromide heat pump unit hot end generates is sent to the low temperature in low temperature seawater desalination system through hot water circulating pump Multiple-effect evaporation module, hot water as heat source flow through low-temperature multi-effect evaporation module one effect low-temperature evaporation module after be recycled back to lithium bromide Heat pump unit hot end, seawater flow into low-temperature multi-effect after the heating of second level pre-heater and evaporate in module；The hot fresh water of evaporation of seawater As heat source followed by next effect low-temperature evaporation module and level-one pre-heater, flow ultimately into fresh-water tank, high salinity Concentrated seawater is flowed out from last outlet imitated of low-temperature multi-effect evaporation module, is sent to bittern case, completes white to take heat using disappearing Heat in system carries out desalination recycling to seawater.

To realize that the disappear total energy approach method of white coupling sea water desalination of above-mentioned flue gas further designs a kind of cigarette Gas disappear it is white coupling sea water desalination energy comprehensive utilization system, the system comprises Thermal System of Fossil Fuel-Fired Power Station, disappear it is white take hot systems, Three parts of low temperature seawater desalination system；

The therrmodynamic system includes boiler, steam turbine, condenser, feed pump, circulating pump room, deduster, desulfurizing tower, cigarette Gas Cooler and chimney；The smoke outlet of the boiler and the entrance of deduster connect, the outlet of deduster and the entrance of desulfurizing tower Connection, the outlet of desulfurizing tower and the smoke inlet of gas cooler connect, and the exhanst gas outlet of gas cooler is connect with chimney, cigarette Gas from boiler generate after with regard to successively by deduster, desulfurizing tower, gas cooler carry out flue-gas dust-removing and desulfurization disappear it is white after pass through Chimney discharge.The lack of gas outlet of the connection of the steam inlet of boiler and steam turbine, steam turbine is connect with the lack of gas entrance of condenser, is coagulated The condensation water out of vapour device is connected with the water inlet of feed pump, and the water outlet of feed pump is connected with the water inlet of boiler, vapour Lack of gas are discharged into condenser after turbine acting, and after seawater cooling, water enters boiler by feed pump and recycles.The condensing Device cooling water is connected for water return pipeline with circulating pump room, and the cooling seawater of condenser is provided by circulating pump room, and seawater is inhaled It heats up 5 DEG C -7 DEG C after receiving lack of gas latent heat, most of seawater flows back to sea, and small part is then sent to the heating of level-one pre-heater.

It is described disappear it is white take hot systems include lithium bromide heat pump unit, refrigerant circulation pump；The lithium bromide heat pump machine that system uses Group is mono-potency lithium bromide heat pump, and COP 1.7, i.e. recycling 0.7J flue gas heat low-temperature heat quantity need to consume 1J high temperature driven heat High temperature is measured, and generates the middle low-temperature water heating of 1.7J.Lithium bromide heat pump unit includes cold side conduits and hot side conduit, the cold end pipe Road includes cold source outlet and cold source entrance, and the hot side conduit includes thermal source outlet and thermal source inlet；Lithium bromide heat pump unit Cold source outlet is connected with the cold source entrance of gas cooler described in therrmodynamic system, the cold source outlet of gas cooler and refrigerant The entrance of circulating pump is connected, and the outlet of the refrigerant circulation pump is connected with the cold source entrance of lithium bromide heat pump unit；Lithium bromide Heat pump unit cold end generate chilled water be supplied to gas cooler disappear it is white, chilled water cooler heat absorption after be warming up to 25 DEG C, and lithium bromide heat pump is transferred heat to, carry out flue gas heat recycling.

The low temperature seawater desalination system includes seawater pretreatment system, level-one pre-heater, second level pre-heater, low temperature Multiple-effect evaporation module, steam condenser, bittern case, fresh-water tank, hot water circulating pump, seawater booster pump；It is coagulated described in therrmodynamic system The connection of the entrance of vapour device backwater outlet and seawater pretreatment system, the water outlet and seawater booster pump of the sea water preprocessing device Water inlet be connected, the water outlet of seawater booster pump is connected with the seawater inlet of level-one pre-heater；Extract cooling condenser and The part seawater of heating enters low temperature seawater desalination system, carries out a part of recycling to the heat in therrmodynamic system.It is described The seawer outlet of pre-heater is connected with the seawater inlet of second level pre-heater, the seawer outlet of second level pre-heater with it is low The seawater inlet of warm multiple-effect evaporation module is connected, and low-temperature multi-effect evaporates the steam (vapor) outlet of module and the steam inlet of steam condenser Be connected, low-temperature multi-effect evaporation module water outlet be connected with the fresh water entrance of level-one pre-heater, level-one pre-heater it is light Water out is connected with the water inlet of fresh-water tank；The concentrated seawater outlet of low-temperature multi-effect evaporation module is connected with the entrance of bittern case.

Disappear the white driving steam condensation water discharge spout mouth for taking lithium bromide heat pump unit described in hot systems and second level preheating The hydrophobic entrance of device connects, and the hydrophobic outlet of the second level pre-heater and the hydrophobic entrance of condenser connect, and drives to steam turbine The hydrophobic latent heat that dynamic lithium bromide heat pump generates has carried out the utilization of heat and the recycling of water；The heat source of the lithium bromide heat pump unit Outlet is connected with the hot water inlet of hot water circulating pump, and the heat source of hot water outlet and low-temperature multi-effect the evaporation module of hot water circulating pump enters Mouth is connected, and the thermal source outlet of low-temperature multi-effect evaporation module is connected with the thermal source inlet of lithium bromide heat pump unit, lithium bromide heat pump Unit provides heat source to low temperature seawater desalination system.

Further, the application design flue gas disappear it is white coupling sea water desalination energy comprehensive utilization system, it is described directly Disappear it is white to take hot systems further include settling tank, technique water tank, condensate water discharge pump, sludge discharge pump, blast cap pallet, the flue gas is cold But device is the white cooler that directly disappears；The cold source outlet of the lithium bromide heat pump unit is connected with the white cooler spraying layer that directly disappears, White cooler bottom disappear directly as blast cap pallet, refrigerant falls into blast cap pallet, the outlet of blast cap pallet and settling tank after spraying Entrance be connected, flue gas condensing water and refrigerant mixing after flow automatically together into settling tank, the outlet of settling tank goes out including supernatant liquor Mouth and lower layer's sludge outlet, supernatant liquor are flowed into technique water tank, and lower layer's sludge outlet is connected with the entrance of sludge discharge pump, The outlet of sludge discharge pump is connected with the entrance of desulfurization pulping system, and sludge is sent to desulfurization pulping system through sludge discharge pump；Institute The outlet for stating technique water tank includes first outlet and second outlet, and the first outlet is connected with the entrance that refrigerant circulation pumps, cold The outlet of matchmaker's circulating pump is connected with the cold source entrance of lithium bromide heat pump unit, the second outlet and condensate water discharge pump of technique water tank Entrance be connected, the outlet of condensate water discharge pump is connected with the entrance of seawater booster pump described in low temperature seawater desalination system, work Skill water tank inner part water is sent to low temperature seawater desalination system through condensate water discharge pump, remaining water is sent to refrigerant circulation pump circulation benefit With.

Further, the application design flue gas disappear it is white coupling sea water desalination energy comprehensive utilization system, it is described indirectly Disappear it is white to take hot systems further include settling tank, technique water tank, condensate water discharge pump, sludge discharge pump, blast cap pallet, expansion tank, The gas cooler is the white cooler that disappears indirectly；The lithium bromide heat pump unit cold source outlet and the white cooler heat exchange that disappears indirectly Coil pipe is connected, and the entrance that the outlet of white cooler heat exchange coil pump with refrigerant circulation that disappears indirectly is connected, outlet that refrigerant circulation pumps and The cold source entrance of lithium bromide heat pump unit is connected, and disappears indirectly and is connected with level pressure between white cooler heat exchange coil and refrigerant circulation pump Expansion tank forms a closed circulation system；Disappear indirectly white cooler bottom be blast cap pallet, flue gas disappear it is white take heat after Condensed water fall into blast cap pallet, the outlet of blast cap pallet is connected with the entrance of settling tank, and condensed water is precipitated from flowing into settling tank The outlet of case includes supernatant liquor outlet and lower layer's sludge outlet, and it is clear that supernatant liquor exports the upper layer that is connected with the entrance of technique water tank Liquid is flowed into technique water tank, and lower layer's sludge outlet is connected with the entrance of sludge discharge pump, the outlet and desulfurization of sludge discharge pump The entrance of pulping system is connected, and sludge is sent to desulfurization pulping system through sludge discharge pump；The outlet of technique water tank and condensed water are arranged The entrance pumped out is connected, the outlet and the entrance phase of seawater booster pump described in low temperature seawater desalination system of condensate water discharge pump Even, condensed water is eventually sent to low temperature seawater desalination system.

Further, the application design flue gas disappear it is white coupling sea water desalination energy comprehensive utilization system, the flue gas Cooler is located at desulfurization column overhead, the inlet of chimney.Gas cooler is arranged in desulfurization column overhead, it is only necessary to by desulfurization column overhead Remove, cooler relies on desulfurizing tower ontology rigidity, is installed on its top, is not necessarily to additional floor.And flue gas according to the actual situation Cooler can using direct spray refrigeration water and the direct contact process of flue gas or with flue gas mediate contact technique, mainly depend on In desulfurization column overhead height, flue gas dust burdening etc..Desulfurization column overhead is higher, and cooler installation site is higher, such as uses open system Then cooling water circulating pump consumption is high, and cooling closed system indirectly can be used.If flue gas after desulfurization dustiness is a height of to avoid lithium bromide Evaporator with heat pump blocking is proposed with cooling closed system indirectly.Directly cooling open system can be used in remaining situation.

Further, the application design flue gas disappear it is white coupling sea water desalination energy comprehensive utilization system device, it is described The effect number of low-temperature multi-effect evaporation module is 3 effects -8 effect.When imitating number lower than 3 effect, then thermal energy cannot be made full use of to carry out seawater Sufficiently desalination, but when imitate number be higher than 8 when, behind water vapour temperature it is lower and lower, concentration of seawater is higher and higher, sea water desalination Water yield it is less do not have practical significance.

The utility model has the advantages that

By by flue gas disappear white and sea water desalination organically combine, it can be achieved that it is following the utility model has the advantages that

1, using deep condensation technique, exhaust gas temperature is minimum up to 15 DEG C, realizes that the flue gas entire-year disappears white discharge.

2, desulfurization fume heat may be implemented, moisture recycles.Chilled water is produced by lithium bromide heat pump in gas cooler Raw, flue gas heat send hot low temperature seawater desalination system after being recovered, it is pre- that the condensed water in cooler is then sent to low temperature seawater desalination Processing system realizes hydro-thermal recycling.

3, low temperature seawater desalination system steam consumption quantity is reduced, the comprehensive water generation ratio of system is improved.Low temperature seawater desalination system is adopted With low-temperature multi-effect evaporation technology, low-temperature multi-effect evaporation technology requires heat source temperature to be not less than 80 DEG C, the heat that lithium bromide heat pump generates Coolant-temperature gage is 85 DEG C and meets sea water desalination requirement, and since lithium bromide heat pump COP is 1.7, that is, the heat generated adds compared with direct steam Heat reduces 42%.Also, low temperature seawater desalination system original seawater can be further reduced system steaming using multistage preheating system Vapour consumption.

4, retrofit work amount in desulfurization zone is few.Gas cooler is arranged in desulfurization column overhead, it is only necessary to go desulfurization column overhead Fall, cooler relies on desulfurizing tower ontology rigidity, is installed on its top, is not necessarily to additional floor.

5, the white system setting that disappears is versatile and flexible.Directly spray chilled water and flue gas can be used in gas cooler according to actual needs Direct contact process can also be used and flue gas mediate contact technique.

From the above technical scheme, technical solution of the present invention, which provides, provides a kind of flue gas and disappears white coupling sea water desalination Total energy approach method and system, can satisfy the coal steam-electric plant smoke entire-year disappears the requirement of white discharge, and can use lithium bromide Heat pump unit absorbs after boiler wet method desulfurization vapor latent heat and water in wet saturated flue gas, after being recycled, is used for sea water desalination. It is evaporated using the hot water supply seawater low-temperature multi-effect that lithium bromide heat pump generates, the comprehensive utilization of thermal power plant's tow taste heat can be played Purpose.The lithium bromide heat pump COP used can save sea water desalination steam consumption about 40%-45% for 1.7.It can carry out While environmental protection, the utilization rate of the energy is improved.

It should be appreciated that as long as aforementioned concepts and all combinations additionally conceived described in greater detail below are at this It can be viewed as a part of the subject matter of the disclosure in the case that the design of sample is not conflicting.

Can be more fully appreciated from the following description in conjunction with attached drawing present invention teach that the foregoing and other aspects, reality Apply example and feature.The features and/or benefits of other additional aspects such as illustrative embodiments of the invention will be below Description in it is obvious, or learnt in practice by the specific embodiment instructed according to the present invention.

Detailed description of the invention

Attached drawing is not intended to drawn to scale.In the accompanying drawings, identical or nearly identical group each of is shown in each figure It can be indicated by the same numeral at part.For clarity, in each figure, not each component part is labeled. Now, example will be passed through and the embodiments of various aspects of the invention is described in reference to the drawings, in which:

Fig. 1 be flue gas of the present invention disappear white coupling sea water desalination ability integration using system and device flow diagram；

Fig. 2 is that flue gas disappears white direct cooling system device figure；

Fig. 3 is that flue gas disappears white indirect cooling system device figure；

Fig. 4 is the in line thermal procession line chart of desulfurization wet flue gas；

Fig. 5 is desulfurization fume thermal procession line chart after this system deep condensation.

1, gas cooler；2, refrigerant circulation pumps；3, lithium bromide heat pump unit；4, seawater booster pump；5, level-one preheats Device；6, second level pre-heater；7, hot water circulating pump；8, an effect low-temperature evaporation module；9, two effect low-temperature evaporation module；10, triple effect Low-temperature evaporation module；11, bittern case；12, steam condenser；13, fresh-water tank；14, boiler；15, deduster；16, desulfurizing tower； 17, chimney；18, steam turbine；19, feed pump；20, condenser；21, circulating pump room；2201, directly disappear white cooler spray Layer；2202, disappear white cooler heat exchange coil indirectly；23, blast cap pallet；24, settling tank；25, sludge discharge pump；26, process water Case；27, condensate water discharge pump；28, expansion tank；29, sea water preprocessing device；30, desulfurization pulping system.

Specific embodiment

In order to better understand the technical content of the present invention, special to lift specific embodiment and institute's accompanying drawings is cooperated to be described as follows.

Various aspects with reference to the accompanying drawings to describe the present invention in the disclosure, shown in the drawings of the embodiment of many explanations. It is not intended to cover all aspects of the invention for embodiment of the disclosure.It should be appreciated that a variety of designs and reality presented hereinbefore Those of apply example, and describe in more detail below design and embodiment can in many ways in any one come it is real It applies, this is because conception and embodiment disclosed in this invention are not limited to any embodiment.In addition, disclosed by the invention one A little aspects can be used alone, or otherwise any appropriately combined use with disclosed by the invention.

The present invention design a kind of flue gas disappear white coupling sea water desalination total energy approach method, boiler in therrmodynamic system For the flue gas of 14 discharges followed by 15 dedusting of deduster, 16 desulfurization of desulfurizing tower, it is cooling that the wet saturated flue gas after desulfurization enters flue gas Device 1, wet saturated flue gas is in gas cooler 1 and cooling, deep dehydration, final flue gas are completed in water-borne directly or indirectly contact About 15 DEG C of exhaust temperature, realize flue gas disappear it is white；Chilled water needed for 1 in gas cooler is mentioned by 3 cold end of lithium bromide heat pump unit For chilled water temperature is about 7 DEG C, and the vapor and chilled water in wet saturated flue gas exchange heat in gas cooler 1 forms condensation Water enters low temperature seawater desalination system and finally flows into fresh-water tank 13；Chilled water is warming up to 25 after 1 heat absorption in gas cooler DEG C, and lithium bromide heat pump unit 3 is transferred heat to, the hot water that 3 hot end of lithium bromide heat pump unit generates then is used as heat source to drive The work of low temperature seawater desalination system, generates fresh water, realizes the recycling of fume waste heat and water.

The main steam driving steam turbine 18 that boiler 14 generates generates electricity, and lack of gas are discharged into condenser 20 and are cooled down after acting, coagulates It heats up about 5 DEG C~7 DEG C after the latent heat that vapour device 20 is generated using seawater as cold source, the cooling of Absorption by Sea Water lack of gas, the sea after heating Moisture is two parts, and a part flows back to sea, and another part is sent to level-one pre-heater after the processing of sea water preprocessing device 29 5, the high-temperature water of level-one pre-heater 5 produces water from each effect sea water desalination module, and each module produces about 45 DEG C of water final temperature, level-one Mainly recycling produces water section sensible heat to pre-heater 5；Seawater is flowed into second level pre-heater 6 from level-one pre-heater 5 and heats again Then about 45 DEG C -55 DEG C of seawater afterwards are sent in low-temperature multi-effect evaporation module and carry out sea water desalination processing；

3 driving heat source of lithium bromide heat pump unit uses 6 sections of steam extractions of steam turbine 18, hydrophobic after steam extraction condensation to send as heat source It toward second level pre-heater 6, is drawn back by 20 back pressure of condenser hydrophobic, completes and hydrophobic (about 110 DEG C -160 DEG C) sensible heat is returned It receives and utilizes, while decreasing the high temperature impact to condenser 20.

The hot water that 3 hot end of lithium bromide heat pump unit generates is sent to low in low temperature seawater desalination system through hot water circulating pump 7 Warm multiple-effect evaporation module, heat source, which flows through, is recycled back to the hot end of lithium bromide heat pump unit 3 after low-temperature multi-effect evaporation module, and seawater is from two Grade pre-heater 6 flows into the effect low-temperature evaporation module in low-temperature multi-effect evaporation module after heating；The steam conduct of evaporation of seawater Heat source flows ultimately into fresh-water tank 13, high salinity is dense followed by next effect low-temperature evaporation module and level-one pre-heater 5 Contracting seawater is flowed out from last outlet imitated of low-temperature multi-effect evaporation module, is sent to bittern case 11, completes to utilize therrmodynamic system In heat desalination recycling is carried out to seawater.

To realize that above-mentioned flue gas disappears the total energy approach method of white coupling sea water desalination, when it is implemented, such as Fig. 1 institute Show, design a kind of flue gas and disappear the energy comprehensive utilization system of white coupling sea water desalination, the system comprises Thermal System of Fossil Fuel-Fired Power Station, Disappear and white takes three hot systems, low temperature seawater desalination system parts；

The therrmodynamic system includes boiler 14, steam turbine 18, condenser 20, feed pump 19, circulating pump room 21, deduster 15, desulfurizing tower 16, gas cooler 1 and chimney 17；The flue gas discharge opening of boiler 14 connects deduster 15, the outlet of deduster 15 It is connect with the entrance of desulfurizing tower 16, flue gas enters 15 dedusting of deduster, and the flue gas after dedusting flows into desulfurizing tower 16, desulfurizing tower 16 Outlet connect with the smoke inlet of gas cooler 1, and flue gas is cooled down from the entrance gas cooler 1 of desulfurizing tower 16 to disappear white, and flue gas is cold But the exhanst gas outlet of device 1 is connect with chimney 17, flue gas gas cooler 1 carry out flue gas disappear it is white after atmosphere is discharged by chimney 17 In.Boiler 14 is connect with the steam inlet of steam turbine 18, after the steam of boiler 14 is supplied to the power generation of steam turbine 18, steam turbine 18 Lack of gas outlet is connect with the lack of gas entrance of condenser 20, and the lack of gas after steam turbine 18 does work flow into the cooling of condenser 20, condenser 20 condensation water out is connected with the water inlet of feed pump 19, and the water outlet of feed pump 19 is connected with the water inlet of boiler 14 It connects, hot water is recycled by feed pump 19 into boiler 14.The cooling requirement circulating pump room 21 of condenser 20 provides cold water, Circulating pump room 21 includes water supply line and water return pipeline, and the water supply line of circulating pump room 21 is that condenser 20 provides seawater work For cooling water, seawater enters after condenser 20 absorbs heat the water return pipeline cocurrent for entering circulating pump room 21 from circulating pump room 21 Out, it heats up 5 DEG C -7 DEG C after Absorption by Sea Water lack of gas latent heat, most of seawater flows back to sea, and the seawater after extracting small part heating is sent It is heated toward level-one pre-heater 5.

Setting disappear it is white take hot systems include lithium bromide heat pump unit 3, refrigerant circulation pump 2；The lithium bromide heat pump that system uses Unit 3 is the mono-potency lithium bromide heat pump that COP is 1.7.Lithium bromide heat pump unit 3 includes cold side conduits and hot side conduit；Lithium bromide The cold side conduits of heat pump unit 3 are connected with gas cooler 1 in therrmodynamic system, the outlet of gas cooler 1 and refrigerant circulation The entrance of pump 2 is connected, and refrigerant circulation pump 2 is connect with the cold side conduits another port of lithium bromide heat pump unit 3；Lithium bromide heat pump machine Group 3 generation chilled waters be supplied to gas cooler 1 disappear it is white, chilled water cooler heat absorption after be warming up to 25 DEG C, flow through cold Matchmaker's circulating pump 2 flows back to 3 cold end of lithium bromide heat pump unit, and transfers heat to lithium bromide heat pump unit 3, carries out flue gas heat and returns It receives.

Setting low temperature seawater desalination system includes seawater pretreatment system, level-one pre-heater 5, second level pre-heater 6, low Warm multiple-effect evaporation module, steam condenser 12, bittern case 11, fresh-water tank 13, hot water circulating pump 7, seawater booster pump 4；Heating power system The backwater outlet of condenser 20 is connect with sea water preprocessing device 29 in system, sea water preprocessing device 29 and 4 phase of seawater booster pump Even, seawater booster pump 4 is connected with level-one pre-heater 5；It is pre- that the part seawater to heat up after the cooling condenser 20 of extraction enters seawater Processing unit 29 simultaneously flows into low temperature seawater desalination system, carries out a part of recycling to the heat in therrmodynamic system.Level-one is pre- Heater 5 is connected with second level pre-heater 6, an effect low-temperature evaporation module 8 of second level pre-heater 6 and low-temperature multi-effect evaporation module It is connected and seawater is provided, the heat source that 3 hot end of lithium bromide heat pump unit generates is sent in low temperature seawater desalination system through hot water circulating pump 7 Effect 8 pipeline of low-temperature evaporation module, heat source is recycled back to lithium bromide heat pump unit 3 after flowing through 8 pipeline of an effect low-temperature evaporation module； The steam of evaporation of seawater enters the pipeline of two effect low-temperature evaporation modules 9 as heat source, and seawater is flowed into from an effect low-temperature evaporation module 8 In two effect low-temperature evaporation modules 9, steam flows through and flows into level-one pre-heater as heat source after the pipelines of two effect low-temperature evaporation modules 9 5；The steam of evaporation of seawater in two effect low-temperature evaporation modules 9 enters the pipeline of triple effect low-temperature evaporation module 10, sea as heat source Water flows into triple effect low-temperature evaporation module 10 from two effect low-temperature evaporation modules 9, and steam flows through 10 pipeline of triple effect low-temperature evaporation module Level-one pre-heater 5 is flowed into as heat source afterwards, the steam of evaporation of seawater flows into level-one pre-heater after flowing through steam condenser 12 5, all heat sources for flowing into level-one pre-heaters 5 flow out in fresh-water tank 13 from level-one pre-heater 5, and seawater is from triple effect low temperature The outlet of evaporation module 10 is flowed into bittern case 11, and completion desalinates back seawater using the white heat taken in hot systems that disappears It receives.

The disappear white driving steam condensation water discharge spout mouth for taking lithium bromide heat pump unit 3 in hot systems and second level preheating are set Device 6 connects, and lithium bromide heat pump drives the hydrophobic of steam generation to flow into second level pre-heater 6 from lithium bromide heat pump unit 3, and second level is pre- The connection of heater 6 and condenser 20, hydrophobic conduct heat source flows into condenser 20 after flowing through second level pre-heater 6, to steamer The hydrophobic latent heat that machine 18 drives lithium bromide heat pump unit 3 to generate has carried out the utilization of heat and the recycling of water；Lithium bromide heat pump machine The thermal source outlet of group 3 is connected with the hot water inlet of hot water circulating pump 7, hot water outlet and the low-temperature multi-effect evaporation of hot water circulating pump 7 The heat source that the connected lithium bromide heat pump unit 3 of the thermal source inlet of module generates flows into low-temperature multi-effect evaporation mold by hot water circulating pump 7 Block one effect low-temperature evaporation module 8 in and provide be used for evaporation of seawater heat, low-temperature multi-effect evaporate module thermal source outlet with The thermal source inlet of lithium bromide heat pump unit 3 is connected, and the hot end of lithium bromide heat pump unit 3 is flowed back to after heat source evaporation seawater cooling.