CN107551751A - Moisture and heat recovery and utilization method and its system in a kind of coal-burning power plant's discharge flue gas - Google Patents

Moisture and heat recovery and utilization method and its system in a kind of coal-burning power plant's discharge flue gas Download PDF

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Publication number
CN107551751A
CN107551751A CN201710761611.1A CN201710761611A CN107551751A CN 107551751 A CN107551751 A CN 107551751A CN 201710761611 A CN201710761611 A CN 201710761611A CN 107551751 A CN107551751 A CN 107551751A
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China
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condenser
heat
pipeline
power plant
flue gas
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翟欢乐
王勇
陆军
刘敏
阚亚雄
邓春萌
陆荣
阮小婷
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Jiangsu Hit Fluid Engineering Equipment Technology Co Ltd
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Jiangsu Hit Fluid Engineering Equipment Technology Co Ltd
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Abstract

The invention discloses a kind of coal-burning power plant to discharge moisture and heat recovery and utilization method and its system in flue gas, and this method is realized by hollow-fibre membrane vapor trapping system and heat pump two systems;The hollow-fibre membrane vapor trapping system includes membrane module, condenser A, vavuum pump, condensate pump and purifier;The heat pump includes joining end to end the evaporator to form circulation loop, compressor, condenser B and expansion valve by heat exchange circulation pipeline A, the heat pump is that hollow-fibre membrane vapor trapping system will trap water vapor condensation into water extraction cooling source, realizes Water Sproading;The hollow-fibre membrane vapor trapping system provides thermal source for heat pump heating boiler recirculated water, realizes heat recovery.In coal-burning power plant's discharge flue gas 20% 40% moisture and heat can be recycled using the present invention, reaches the purpose saved water and energy;Improve power plant emission Gas Parameters simultaneously, solve the problems, such as white cigarette phenomenon and gypsum rain.

Description

Moisture and heat recovery and utilization method and its system in a kind of coal-burning power plant's discharge flue gas
Technical field
The present invention relates to moisture and heat recovery and utilization technical field, and in particular to discharges flue gas reclaimed water in a kind of coal-burning power plant Point and heat recovery and utilization method and its system.
Background technology
For coal-burning power plant, due to being mounted with wet desulphurization tower, discharge in flue gas and contain substantial amounts of saturated steam.For One 600MW coal unit, 50 DEG C or so of exhaust gas volumn about 200 × 10 is discharged per hour4Nm3/ h, saturation water is carried in flue gas Vapor content about 200t/h, vapor carry latent heat about 1.24 × 108Kcal/h, coal unit are run 5500 hours by annual Calculate, then about 1,100,000 tons of water of year discharge, discharge heat year equivalent to 9.7 ten thousand tons of mark coals of burning.
Because the temperature of coal-burning power plant's discharge flue gas is relatively low, realize that moisture and heat recovery have larger difficulty, current state Internal and external parts research institution carries out recovery technology to moisture in flue gas and heat using hollow-fibre membrane and ceramic membrane and ground Study carefully, as Nanjing University of Technology have studied " a kind of ceramic membrane condensation process recovery method of power plant stack gas waste heat and water " ZL201310685026.X, North China Electric Power University have studied a kind of " device that water vapour in flue gas is trapped based on hollow-fibre membrane And method " ZL201310410548.9, but the existing achievement in research of both technologies still suffers from some problems, can not enter in power plant Row business promotion.Wherein, ceramic membrane recovery technology is in the incorgruous flowing flue gas in ceramic membrane both sides and cooling water, though moisture can be carried out Recovery, but because the number of degrees of cooling water heating are limited, it is difficult to realize UTILIZATION OF VESIDUAL HEAT IN, and flue gas because temperature reduces and lift is insufficient, Chimney surrounding environment is made a very bad impression;The advanced water-filling steam separation of hollow-fibre membrane vapor trapping recovery technology is carried out again Condensation recovery, though not reducing power plant's exhaust gas temperature, no matter using air cooling mode or equal using water-cooling pattern condenser system is Critical defect be present, its hollow cold mode is influenced by ambient temperature big and power consumption is high, and then quantity required is huge for water-cooling pattern Cooling water source and it is difficult to Btu utilization.The water resource enriched in flue gas and thermal resource are discharged in face of coal-burning power plant, although existing Some flue gas moisture and heat recovery and utilization technologies obtain good effect in laboratory, but still need solve some key issues Business promotion application can be carried out.
The content of the invention
The purpose of the present invention is to provide moisture and heat recovery profit in a kind of coal-burning power plant's discharge flue gas regarding to the issue above With method and its system, this method using membrane separation technique and heat pump techniques recycle in coal-burning power plant's discharge flue gas moisture and Heat, reach the purpose saved water and energy.
The technical scheme is that:
Moisture and heat recovery and utilization method in a kind of coal-burning power plant's discharge flue gas, are comprised the following steps that:
Membrane module is arranged in the flue between desulfurizing tower of electric power plant and chimney, the membrane module passes through pipeline and condenser A import connection, condenser A one end outlet are connected by pipeline with boiler circulating water line, condensate pump and purifier It is sequentially arranged on the pipeline that condenser A is connected with boiler circulating water line;The condenser A the other end outlet by pipeline with Flue is connected, and vavuum pump is installed on the pipeline that condenser A is connected with flue;Flue gas connects during flue flowing with membrane module Touch, due to the inside and outside differential pressure and selective penetrated property of hollow-fibre membrane, the hydrone in flue gas enters inside hollow-fibre membrane, cocurrent To condenser A;Condenser A and heat pump carry out heat exchange, in the working medium absorptive condenser A in heat exchange circulation pipeline A Heat, vapor is condensed in condenser A, so that the pressure in condenser A is in compared with low state, maintains hollow-fibre membrane Inside and outside differential pressure;Uncooled vapor and remaining gas flow back to flue, the vapor warp of condensation by vavuum pump in condenser A Boiler feedwater is used as after crossing purifier processing;Heat pump absorbs heat from condenser A, and the heat pump includes passing through pipe Road joins end to end the evaporator to form circulation loop, compressor, condenser B and expansion valve, and the pipeline for forming circulation loop is built-in There is working medium;The low temperature liquid working medium of the expansion valve outflow is become by the heat in heat exchange circulation pipeline A absorptive condensers A Enter evaporator into normal temperature gaseous working medium, upgrade to high-temperature gas thermal source after compressor work;High-temperature gas thermal source enters After condenser B, by the boiler recirculated water draw heat in heat exchange circulation pipeline B, become normal temperature liquid refrigerant and flow to expansion valve, By becoming low temperature liquid working medium after expansion valve.
It is a kind of realize described in coal-burning power plant's discharge flue gas in the system of moisture and heat recovery and utilization method, it is including hollow Tunica fibrosa vapor trapping system and heat pump;
The hollow-fibre membrane vapor trapping system includes membrane module, condenser A, vavuum pump, condensate pump and water purification Equipment;The membrane module is arranged in the flue between desulfurizing tower of electric power plant and chimney;The membrane module passes through pipeline and condenser A Import connection, condenser A one end outlet is connected by pipeline with boiler circulating water line, condensate pump and purifier according to On the secondary pipeline for being located at condenser A and being connected with boiler circulating water line;The other end outlet of the condenser A passes through pipeline and cigarette Road is connected, and vavuum pump is arranged on the pipeline that condenser A is connected with flue;
The heat pump includes joined end to end by heat exchange circulation pipeline the A evaporator to form circulation loop, compression Machine, condenser B and expansion valve, heat exchange circulation pipeline A is built with working medium;
The heat pump absorbs heat, the expansion valve and evaporator by heat exchange circulation pipeline A from condenser A Between heat exchange circulation pipeline A stretched into from condenser A one end through hole inside condenser A, pass and evaporate from the through hole of the other end Device connects;
The heat exchange circulation pipeline B of boiler circulating water line is stretched into inside condenser B from condenser B one end through hole, from another The through hole of one end passes, and the heat pump gives boiler circulating water heating by heat exchange circulation pipeline B.
In such scheme, in addition to blower fan;The assembling is located at behind membrane module in flue.
In such scheme, the membrane module is that the encapsulation of some hollow fiber film threads forms.
In such scheme, the purifier is mixed bed or EDI devices.
In such scheme, the working medium is the compounds such as halogenated hydrocarbons or freon.
Compared with prior art, the beneficial effects of the invention are as follows:The evaporator of heat pump of the present invention is hollow-fibre membrane Vapor trapping system will trap water vapor condensation into water extraction cooling source, realize Water Sproading;Hollow-fibre membrane vapor trapping system The vapor of system trapping provides thermal source for heat pump heating boiler recirculated water, realizes heat recovery.The present invention can reclaim profit The moisture and heat of 20%-40% in flue gas is discharged with coal-burning power plant, reaches the purpose saved water and energy;Discharge cigarette is not changed simultaneously The temperature of gas, flue gas water content is reduced, so as to solve the problems, such as power plant's white cigarette phenomenon and gypsum rain.
Brief description of the drawings
Fig. 1 is that the flow of moisture and heat recovery and utilization method in flue gas is discharged by the coal-burning power plant of an embodiment of the present invention Figure.
In figure:1st, membrane module;2. condenser A;3. vavuum pump;4. condensate pump;5. purifier;6. evaporator;It is 7. cold Condenser B;8. compressor;9. expansion valve;10. blower fan;11. heat exchange circulation pipeline A;12. heat exchange circulation pipeline B.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description, but protection scope of the present invention It is not limited to this.
Moisture and heat recovery and utilization method comprise the following steps that in a kind of coal-burning power plant's discharge flue gas:
Membrane module 1 is arranged in the flue between desulfurizing tower of electric power plant and chimney, the membrane module 1 passes through pipeline and condensation Device A2 import connection, condenser A2 one end outlet are connected by pipeline with boiler circulating water line, condensate pump 4 and water purification Equipment 5 is sequentially arranged on the pipeline that condenser A2 is connected with boiler circulating water line;The other end outlet of the condenser A2 is logical Piping is connected with flue, and vavuum pump 3 is installed on the pipeline that condenser A2 is connected with flue;Flue gas flue flowing during with Membrane module 1 contacts, and due to the inside and outside differential pressure and selective penetrated property of hollow-fibre membrane, the hydrone in flue gas enters hollow-fibre membrane Inside, and flow to condenser A2;Condenser A2 and heat pump carry out heat exchange, and the working medium in heat exchange circulation pipeline A12 is inhaled The heat in condenser A2 is received, most vapor are condensed in condenser A2, so that the pressure in condenser A2 is in Compared with low state, the inside and outside differential pressure of hollow-fibre membrane is maintained;A small amount of uncooled vapor and remaining gas are led in condenser A2 Cross vavuum pump 3 and flow back to flue, the vapor of condensation is used as boiler feedwater after the processing of purifier 5;
Heat pump absorbs heat from condenser A2, and the heat pump includes passing through heat exchange circulation pipeline A11 head and the tail phases Company forms evaporator 6, compressor 8, condenser B7 and the expansion valve 9 of circulation loop, forms the pipeline of circulation loop built with work Matter;The low temperature liquid working medium that the expansion valve 9 flows out is become by the heat in heat exchange circulation pipeline A11 absorptive condensers A2 Enter evaporator 6 into normal temperature gaseous working medium, upgrade to high-temperature gas thermal source after the acting of compressor 8;High-temperature gas thermal source enters After entering condenser B7, by the boiler recirculated water draw heat in heat exchange circulation pipeline B12, become normal temperature liquid refrigerant flow to it is swollen Swollen valve 9, by becoming low temperature liquid working medium after expansion valve 9.
It is a kind of realize described in coal-burning power plant's discharge flue gas in the system of moisture and heat recovery and utilization method, it is including hollow Tunica fibrosa vapor trapping system and heat pump;
The hollow-fibre membrane vapor trapping system includes membrane module 1, condenser A2, vavuum pump 3, the and of condensate pump 4 Purifier 5;The membrane module 1 is arranged in the flue between desulfurizing tower of electric power plant and chimney;The membrane module 1 is some hollow The encapsulation of fiber film wire forms;The membrane module 1 is connected by pipeline with condenser A2 import, and condenser A2 one end outlet is logical Piping is connected with boiler circulating water line, and condensate pump 4 and purifier are sequentially arranged at condenser A2 and boiler circulating water pipe On the pipeline of road connection;The other end outlet of the condenser A2 is connected by pipeline with flue, and vavuum pump 3 is arranged on condenser On the pipeline that A2 is connected with flue;Flue gas is edged down by its pressure value after membrane module, can install blower fan 10, the blower fan if necessary 10 are arranged in flue, and behind membrane module 2.The purifier is mixed bed or EDI devices.
The heat pump includes joining end to end to form the evaporator of circulation loop by heat exchange circulation pipeline A11 pipelines 6th, compressor 8, condenser B7 and expansion valve 9, the pipeline of circulation loop is formed built with working medium;The working medium is halogenated hydrocarbons or fluorine The compounds such as Leon.
The heat pump absorbs heat by heat exchange circulation pipeline A11 from condenser A2, and the expansion valve 9 is with steaming Heat exchange circulation pipeline A11 is stretched into inside condenser A2 from condenser A2 one end through hole between hair device 6, is worn from the through hole of the other end Go out and be connected with evaporator 6;
The heat exchange circulation pipeline B12 of boiler circulating water line is stretched into inside condenser B7 from condenser B7 one end through hole, Passed from the through hole of the other end, the heat pump gives boiler circulating water heating by heat exchange circulation pipeline B12.
Fig. 1 discharges moisture and the flow chart of heat recovery and utilization method in flue gas for a kind of coal-burning power plant of the present invention, It is designed by taking 600MW coal unit as an example:
Wherein I represents normal discharge flue gas, and its flow is 2640t/h, and temperature is 50 DEG C, pressure 1.014bar, is in Steam-laden state, i.e. vapor flow about 200t/h;
Wherein II represents by discharging flue gas after membrane module 1, and its flow is 2580t/h, and temperature is 50 DEG C, and pressure is 1.01bar, before by membrane module 1 compared with Gas Parameters, a certain proportion of vapor is captured in flue gas, traps ratio and film The erection space of component 1 is related, and erection space is bigger, and corresponding trapping ratio is higher, traps proportion 20%-40%, this example is pressed 30% design;Meanwhile flue gas is edged down by its pressure value after membrane module 1, can install blower fan 10 if necessary;
Wherein III represents the vapor of the trapping of membrane module 1, and its flow is 60t/h, and temperature is 50 DEG C, and pressure is by condenser A2 In condensation temperature determine, condensation temperature is lower, and corresponding steam-laden pressure is lower, sets condensation temperature as 13 DEG C When, corresponding pressure is 0.023bar, and the inside and outside differential pressure of membrane module 1 is 0.991bar;
Wherein IV represents caused condensed water after condenser A2 heat exchange, and its flow is 58.8t/h, and temperature is 13 DEG C, due to Trapping water water quality is preferable, and electrical conductivity is less than 200 μ S/cm, by can be used as boiler feedwater after the simple process of purifier 5;
Wherein V represents uncondensable micro water vapor and other on-condensible gases in condenser A2, and its flow is 1.2t/h, Temperature is 13 DEG C, pressure 0.023bar, is drawn back by vavuum pump 3 to flue;
Wherein VI represents boiler recirculated water, and its flow is 2050t/h, and as coal unit uses water-cooling pattern, then boiler follows Temperature of the ring water after cooling tower is 42 DEG C, and this temperature also refers to the temperature entered before heat pump condenser B7;
Wherein VII represents the boiler recirculated water after heat exchange, and its flow is 2050t/h, by heat pump overall heat exchange efficiency 80% calculates the leaving water temperature of boiler recirculated water, and its value is 55.8 DEG C, reclaims heat 2.83 × 107Kcal/h, equivalent to saving Mark coal 4t/h.
Those listed above is a series of to describe illustrating only for possible embodiments of the invention in detail, They simultaneously are not used to limit the scope of the invention, all equivalent embodiments made without departing from skill spirit of the present invention or change It should be included in the scope of the protection.

Claims (6)

1. moisture and heat recovery and utilization method in a kind of coal-burning power plant's discharge flue gas, it is characterised in that comprise the following steps that:
Membrane module (1) is arranged in the flue between desulfurizing tower of electric power plant and chimney, the membrane module (1) passes through pipeline and condensation Device A (2) import connection, condenser A (2) one end outlet are connected by pipeline with boiler circulating water line, condensate pump (4) It is sequentially arranged at purifier (5) on the pipeline that condenser A (2) is connected with boiler circulating water line;The condenser A (2) Other end outlet is connected by pipeline with flue, and vavuum pump (3) is installed on the pipeline that condenser A (2) is connected with flue;Flue gas exists Contacted during flue flowing with membrane module (1), due to the inside and outside differential pressure and selective penetrated property of hollow-fibre membrane, the water in flue gas Molecule enters inside hollow-fibre membrane, and flows to condenser A (2);Condenser A (2) carries out heat exchange, heat exchange with heat pump The heat in working medium absorptive condenser A (2) in circulation line A (11), vapor is condensed in condenser A (2), so that cold Pressure in condenser A (2) is in the inside and outside differential pressure for compared with low state, maintaining hollow-fibre membrane;It is uncooled in condenser A (2) Vapor and remaining gas flow back to flue by vavuum pump (3), and the vapor of condensation is used as pot after purifier (5) processing Stove make-up water;
Heat pump absorbs heat from condenser A (2), and the heat pump includes passing through heat exchange circulation pipeline A (11) head and the tail phase Company forms evaporator (6), compressor (8), condenser B (7) and the expansion valve (9) of circulation loop, forms the pipeline of circulation loop Built with working medium;The low temperature liquid working medium of expansion valve (9) outflow passes through heat exchange circulation pipeline A (11) absorptive condenser A (2) heat in, become normal temperature gaseous working medium and enter evaporator (6), upgrade to high-temperature gas heat after compressor (8) acting Source;After high-temperature gas thermal source enters condenser B (7), by the boiler recirculated water draw heat in heat exchange circulation pipeline B (12), Become normal temperature liquid refrigerant and flow to expansion valve (9), by becoming low temperature liquid working medium after expansion valve (9).
2. the system of moisture and heat recovery and utilization method in a kind of coal-burning power plant's discharge flue gas realized described in claim 1, It is characterised in that it includes hollow-fibre membrane vapor trapping system and heat pump;
The hollow-fibre membrane vapor trapping system includes membrane module (1), condenser A (2), vavuum pump (3), condensate pump And purifier (5) (4);The membrane module (1) is arranged in the flue between desulfurizing tower of electric power plant and chimney;The membrane module (1) it is connected by pipeline with condenser A (2) import, condenser A (2) one end outlet passes through pipeline and boiler circulating water pipe Road is connected, and condensate pump (4) and purifier are sequentially arranged on the pipeline that condenser A (2) is connected with boiler circulating water line;Institute The other end outlet for stating condenser A (2) is connected by pipeline with flue, and vavuum pump (3) is arranged on condenser A (2) and connected with flue On the pipeline connect;
The heat pump includes joined end to end by heat exchange circulation pipeline A (11) evaporator (6) to form circulation loop, pressure Contracting machine (8), condenser B (7) and expansion valve (9), heat exchange circulation pipeline A (11) is built with working medium;
The heat pump absorbs heat from the condenser A (2) by heat exchange circulation pipeline A (11), the expansion valve (9) with It is internal from condenser A (2) one end through hole to stretch into condenser A (2) by heat exchange circulation pipeline A (11) between evaporator (6), from another The through hole at end passes to be connected with evaporator (6);
The heat exchange circulation pipeline B (12) of boiler circulating water line is stretched into condenser B (7) from condenser B (7) one end through hole Portion, passed from the through hole of the other end, the heat pump gives boiler circulating water heating by heat exchange circulation pipeline B (12).
3. moisture and heat recycling system in a kind of discharge flue gas in coal-burning power plant's according to claim 2, its feature It is, in addition to blower fan (10);The blower fan (10) is arranged in flue, and behind membrane module (2).
4. moisture and heat recycling system in a kind of discharge flue gas in coal-burning power plant's according to claim 2, its feature It is, the membrane module (1) is that the encapsulation of some hollow fiber film threads forms.
5. moisture and heat recycling system in a kind of discharge flue gas in coal-burning power plant's according to claim 2, its feature It is, the purifier is mixed bed or EDI devices.
6. moisture and heat recycling system in a kind of discharge flue gas in coal-burning power plant's according to claim 2, its feature It is, the working medium is halogenated hydrocarbons or freon.
CN201710761611.1A 2017-08-30 2017-08-30 Moisture and heat recovery and utilization method and its system in a kind of coal-burning power plant's discharge flue gas Pending CN107551751A (en)

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CN108278591A (en) * 2018-01-25 2018-07-13 北京建筑大学 A kind of flue gas waste heat recovery and purification system based on membrane separation technique
CN108310943A (en) * 2018-03-06 2018-07-24 北京建筑大学 A kind of ozone oxidation type embrane method flue gas waste heat recovery and purification system
CN108380009A (en) * 2018-04-03 2018-08-10 中国科学院理化技术研究所 Self-circulation device and method for removing white smoke
CN109126363A (en) * 2018-10-31 2019-01-04 南京圣卡孚科技有限公司 A kind of method and device for eliminating white cigarette containing wet flue gas
CN109917074A (en) * 2018-09-26 2019-06-21 华北电力大学 An experimental method and device for simulating the capture of sulfur dioxide and moisture in flue gas
CN109942043A (en) * 2019-04-26 2019-06-28 中创水务科技环保(广东)有限公司 A kind of percolate treating process and device
CN111721665A (en) * 2020-06-19 2020-09-29 陕西省特种设备检验检测研究院 Method and device for detecting content of condensed water in boiler tail flue gas
CN115075914A (en) * 2022-05-31 2022-09-20 中国人民解放军火箭军工程大学 Method for calculating smoke-eliminating and temperature-reducing water consumption of tail gas of diesel generator set

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CN108278591A (en) * 2018-01-25 2018-07-13 北京建筑大学 A kind of flue gas waste heat recovery and purification system based on membrane separation technique
CN108310943A (en) * 2018-03-06 2018-07-24 北京建筑大学 A kind of ozone oxidation type embrane method flue gas waste heat recovery and purification system
CN108380009A (en) * 2018-04-03 2018-08-10 中国科学院理化技术研究所 Self-circulation device and method for removing white smoke
CN108380009B (en) * 2018-04-03 2024-09-20 中国科学院理化技术研究所 Self-circulation device and method for flue gas whitening
CN109917074A (en) * 2018-09-26 2019-06-21 华北电力大学 An experimental method and device for simulating the capture of sulfur dioxide and moisture in flue gas
CN109126363A (en) * 2018-10-31 2019-01-04 南京圣卡孚科技有限公司 A kind of method and device for eliminating white cigarette containing wet flue gas
CN109942043A (en) * 2019-04-26 2019-06-28 中创水务科技环保(广东)有限公司 A kind of percolate treating process and device
CN109942043B (en) * 2019-04-26 2023-09-19 中创水务科技环保(广东)有限公司 Percolate treatment process and device
CN111721665A (en) * 2020-06-19 2020-09-29 陕西省特种设备检验检测研究院 Method and device for detecting content of condensed water in boiler tail flue gas
CN111721665B (en) * 2020-06-19 2022-12-09 陕西省特种设备检验检测研究院 Method and device for detecting content of condensed water in boiler tail flue gas
CN115075914A (en) * 2022-05-31 2022-09-20 中国人民解放军火箭军工程大学 Method for calculating smoke-eliminating and temperature-reducing water consumption of tail gas of diesel generator set
CN115075914B (en) * 2022-05-31 2024-02-06 中国人民解放军火箭军工程大学 Method for calculating smoke abatement, cooling and water consumption of tail gas of diesel generating set

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Application publication date: 20180109