CN104501624A - Power plant used cooling system combining evaporative type cooler and surface type condensing system - Google Patents
Power plant used cooling system combining evaporative type cooler and surface type condensing system Download PDFInfo
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- CN104501624A CN104501624A CN201410749009.2A CN201410749009A CN104501624A CN 104501624 A CN104501624 A CN 104501624A CN 201410749009 A CN201410749009 A CN 201410749009A CN 104501624 A CN104501624 A CN 104501624A
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Abstract
The invention discloses a power plant used cooling system combining an evaporative type cooler and a surface type condensing system. The cooling system comprises the evaporative type cooler, wherein the evaporative type cooler is connected with a surface type condenser and an indirect cooling tower through a water distribution network; the surface type condenser is successively connected with water treatment equipment, a boiler, a steam turbine and a generator combined unit through a water pipe so as to form a closed path. For the power plant used cooling system combining the evaporative type cooler and the surface type condensing system, disclosed by the invention, when used in high temperature environment in summer, a dual-stage cooling manner is adopted for lowering the temperature, so that the cooling effect of circulating water is ensured, the back pressure of the system is reduced, and the generating efficiency of the steam turbine is improved.
Description
Technical field
The invention belongs to cooling system technical field, be specifically related to power plant's cooling system that a kind of evaporative type cooler is combined with surface-type condensing system.
Background technology
Thermal power plant's electricity generation system circulation mainly includes the parts such as boiler, steam turbine, generator and condenser; Surface-type condensing system is also called the solidifying formula indirect air cooling system of table, be lack according to NORTHWEST CHINA regional water the thermal power plant's generating condensing system arisen at the historic moment, surface-type condensing system forms primarily of air cooling tower, surface condenser, circulating water line and water circulating pump; The factor affecting of surface-type condensing system important is the cooling capacity of air cooling tower to recirculated water, and most air cooling tower design cooling range is 10 DEG C.
According to coal resources in China distribution situation, the Northwest's rich coal resources, as thermal power industry, the technology type of traditional clammy cooling tower and the larger shortcoming of water consumption, make its use lacking area in Northwest Dry Region and water resource be restricted.In addition, the hot weather that the Northwest easily occurs summer, larger on the cooling effect impact of air cooling tower, cause air cooling tower cooling effect limited, the general ideal effect that can not reach design at summer high temperature environment, cause electricity generation system back pressure to raise, steam turbine power generation load is limited, often can not reach oepration at full load state, power plants generating electricity coal consumption increases; As can be seen here, particularly important to circulating water cooling at high temperature season.
Evaporation cooling technique is a kind of efficient, water saving, environmental protection and energy-conservation cooling technology, takes away the heat of main equipment, reach the effect of cooling according to latent heat of vaporization during cooling medium evaporation.Evaporative cooling equipment relies on the latent heat of vaporization can realize unit repeats itself water water temperature and is reduced to sub-wet-bulb temperature lower than outdoor air wet bulb temperature; Compare the temperature of the outdoor air of the air cooling cooling limit, the outdoor air wet bulb temperature of the clammy cooling limit more effectively can realize indirect cool tower Inner eycle water for cooling.In the Northwest of China, because air wet-bulb depression is comparatively large, evaporative cooling driven potential is comparatively large, is more conducive to the use of evaporation cooling technique.
For the surface-type condensing system in thermal power plant, NORTHWEST CHINA area, devaporizer is adopted to realize the cooled recirculated water reducing temperature twice of indirect cool tower, give full play to the advantage of devaporizer in Northwest Dry Region, to improve cooling effect, reduction electricity generation system back pressure, raising steam turbine power generation load, saving gross coal consumption rate, the increase power plants generating electricity economic benefit of summer high temperature recirculated water, there is certain promotional value.
Summary of the invention
The object of the present invention is to provide power plant's cooling system that a kind of evaporative type cooler is combined with surface-type condensing system, adopt when summer high temperature environment twin-stage to cool, ensure that the cooling effect of recirculated water, reduce system back pressure, improve steam turbine power generation efficiency.
The technical solution adopted in the present invention is, power plant's cooling system that evaporative type cooler is combined with surface-type condensing system, and include evaporative type cooler, evaporative type cooler is connected with surface condenser, indirect cool tower by grid; Surface condenser connects and composes closed-loop path with water treatment facilities, boiler, steam turbine and generator combined unit successively by water pipe.
Feature of the present invention is also,
Evaporative type cooler, includes cooler casing, and the two side that cooler casing is relative is respectively provided with an air inlet; Be provided with heat exchange module-packing composite cooling unit in cooler casing, the arranged on left and right sides of heat exchange module-packing composite cooling unit is respectively provided with a vertical pipe type indirect evaporating-cooling unit; The top of heat exchange module-packing composite cooling unit is provided with water collection device a, cooler casing roof corresponding above water collection device a is provided with exhaust outlet, is provided with cooling blower a (18) in exhaust outlet; The top of vertical pipe type indirect evaporating-cooling unit is provided with water collection device b, cooler casing roof corresponding above water collection device b is provided with ventilation window, is provided with cooling blower b in ventilation window.
Vertical pipe type indirect evaporating-cooling unit, includes vertical heat exchanging pipe group, and the top of vertical heat exchanging pipe group is provided with liquid distribution b, and liquid distribution b is made up of shower and the nozzle that is evenly arranged at multiple downward spray on shower; The below of vertical heat exchanging pipe group is provided with cyclic water tank b, and cyclic water tank b is connected with shower by the second feed pipe; Form air channel between vertical heat exchanging Guan Zuyu cyclic water tank b, the housing of cooler body sidewall that air channel is corresponding is provided with overfiren air port.
Vertical heat exchanging pipe group is made up of the heat exchanger tube that many are vertically arranged.
Second feed pipe is provided with water circulating pump b.
Heat exchange module-packing composite cooling unit, includes heat exchange module, and heat exchange module is connected with described surface condenser, indirect cool tower by grid; The top of heat exchange module is provided with liquid distribution a, and liquid distribution a is made up of sparge pipe and the nozzle that is evenly arranged at multiple downward spray on sparge pipe; The below of heat exchange module is disposed with evaporative cooling filler and cyclic water tank a, and cyclic water tank a is connected with sparge pipe by the first feed pipe.
The delivery port of heat exchange module passes through evaporative type cooler circulating water pipe and is connected with surface condenser, go out on evaporative type cooler circulating water pipe and be connected with demineralized water water distributor, demineralized water water distributor passes through to be connected into evaporative type cooler circulating water pipe with the water inlet of heat exchange module; Surface condenser is connected with indirect cool tower by the first water pipe, and indirect cool tower is connected with demineralized water water distributor by the second water pipe.
Heat exchange module is heat exchange coil.
First feed pipe is provided with water circulating pump a.
Evaporative cooling filler is the filler of inverted triangle body shape.
Beneficial effect of the present invention is:
1. power plant of the present invention cooling system adopts the cooled recirculated water of evaporative type cooler splitter section indirect cool tower to carry out cooling twice, mix with former water route through cooling twice Posterior circle water, reach the object of indirect cool tower recirculated water reducing temperature twice, ensure the cooling effect at summer high temperature slot cycle water, to alleviate the situation that summer high temperature period surface condenser back pressure raises the systems generate electricity load decline caused, and then reduce power plants generating electricity coal consumption, improve generating efficiency.
2. vertical pipe type indirect evaporating-cooling unit to be combined with heat exchange module-packing composite cooling unit with cooling system and to form evaporative type cooler by power plant of the present invention, by vertical pipe type indirect evaporating-cooling unit fore-cooling room outer air, air themperature is reduced further again by the evaporative cooling filler in heat exchange module-packing composite cooling unit, when summer high temperature environment, improve the indirect cool tower recirculated water heat exchange efficiency that air is connected with heat exchange module.
3. power plant of the present invention adopts the combining form of indirect evaporative cooling technology and direct evaporating-cooling technology compound with cooling system, reduce trickle water temperature in evaporative type cooler, the indirect cool tower leaving water temperature be connected with heat exchange module is higher, generally be in the temperature range of easier fouling, the reduction of trickle room temperature can make trickle not easily in the outer fouling of heat exchange module, ensure that the service life of evaporative type cooler.
4. be provided with water collection device in the evaporative type cooler in power plant of the present invention cooling system, reduce the drift ice water consumption of evaporative type cooler, the potential safety hazard that the system reform causes original system is less, has certain exploitativeness.
Accompanying drawing explanation
The structural representation of Tu1Shi power plant of the present invention cooling system;
The structural representation of evaporative type cooler in Tu2Shi power plant of the present invention cooling system.
In figure, 1. evaporative type cooler, 2. enter evaporative type cooler circulating water pipe, 3. go out evaporative type cooler circulating water pipe, 4. water treatment facilities, 5. boiler, 6. steam turbine and generator combined unit, 7. surface condenser, 8. indirect cool tower, 9. demineralized water water distributor, 10. water circulating pump b, 11. cyclic water tank b, 12. evaporative cooling fillers, 13. water circulating pump a, 14. cyclic water tank a, 15. water collection device a, 16. heat exchange modules, 17. liquid distribution a, 18. cooling blower a, 19. water collection device b, 20. cooling blower b, 21. liquid distribution b, 22. standpipe set of heat exchange tubes, 23. first water pipes, 24. second water pipes.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Power plant's cooling system that evaporative type cooler of the present invention is combined with surface-type condensing system, its structure as shown in Figure 1, includes evaporative type cooler 1, and evaporative type cooler 1 is connected with surface condenser 7 and indirect cool tower 8 by grid; Surface condenser 7 connects and composes closed-loop path with water treatment facilities 4, boiler 5, steam turbine and generator combined unit 6 successively by water pipe.
Evaporative type cooler 1, its structure as shown in Figure 2, include cooler casing, the two side that cooler casing is relative is respectively provided with an air inlet, be provided with heat exchange module-packing composite cooling unit in cooler casing, the arranged on left and right sides of heat exchange module-packing composite cooling unit is respectively provided with a vertical pipe type indirect evaporating-cooling unit; The top of heat exchange module-packing composite cooling unit is provided with water collection device a15, cooler casing roof corresponding above water collection device a15 is provided with exhaust outlet, cooling blower a18 is provided with in exhaust outlet, the top of each vertical pipe type indirect evaporating-cooling unit is provided with water collection device b19, cooler casing roof corresponding above water collection device b19 is provided with ventilation window, in ventilation window, is provided with cooling blower b20.
Vertical pipe type indirect evaporating-cooling unit, includes vertical heat exchanging pipe group 22, and vertical heat exchanging pipe group 22 is made up of the heat exchanger tube that many are vertically arranged; The top of vertical heat exchanging pipe group 22 is provided with liquid distribution b21, and liquid distribution b21 is made up of shower and the nozzle that is evenly arranged at multiple downward spray on shower; The below of vertical heat exchanging pipe group 22 is provided with cyclic water tank b11, and cyclic water tank b11 is connected with shower by the second feed pipe, the second feed pipe is provided with water circulating pump b10; Form air channel between vertical heat exchanging pipe group 22 and cyclic water tank b11, the housing of cooler body sidewall that air channel is corresponding is provided with overfiren air port.
Heat exchange module-packing composite cooling unit, includes heat exchange module 16, and heat exchange module 16 is connected with surface condenser 7, indirect cool tower 8 by grid; The top of heat exchange module 16 is provided with liquid distribution a17, and liquid distribution a17 is made up of sparge pipe and the nozzle that is evenly arranged at multiple downward spray on sparge pipe; The below of heat exchange module 16 is disposed with evaporative cooling filler 12 and cyclic water tank a14, and cyclic water tank a14 is connected with sparge pipe by the first feed pipe, the first feed pipe is provided with water circulating pump a13.
As shown in Figure 1, the delivery port of heat exchange module 16 passes through evaporative type cooler circulating water pipe 3 and is connected with surface condenser 7, go out on evaporative type cooler circulating water pipe 3 and be connected with demineralized water water distributor 9, demineralized water water distributor 9 passes through to be connected into the water inlet of evaporative type cooler circulating water pipe 2 with heat exchange module 16; Surface condenser 7 is connected with indirect cool tower 8 by the first water pipe 23, and indirect cool tower 8 is connected on demineralized water water distributor 9 by the second water pipe 24.
Heat exchange module 16 is heat exchange coil.
Evaporative cooling filler 12 is the filler of inverted triangle body shape.
The operation principle of power plant's cooling system that evaporative type cooler of the present invention is combined with surface-type condensing system:
The air inlet of air first on evaporative type cooler 1 two side enters in evaporative type cooler 1, two vertical pipe type indirect evaporating-cooling unit are entered in the drainage of cooling blower a18, in each vertical pipe type indirect evaporating-cooling unit, air is divided into two parts, portion of air flows through outside heat exchanger tube, another part air flows through in heat exchanger tube, by liquid distribution a17 spray under water in heat exchanger tube with air inversion heat exchange, increase the heat exchange efficiency of air and water, heat exchange inner air tube and water hot and humid area, be attached to the water film surface water evaporation of heat exchanger tube inwall, moisture film heat on absorption heat-exchange tube wall, carry out the air outside cooling heat transferring pipe, trickle mediate contact in air and heat exchanger tube, the outer outdoor air of heat exchanger tube by etc. but clammy, air after precooling enters in heat exchange module-packing composite cooling unit, water when evaporative cooling filler 12 and under liquid distribution a17 sprays carries out hot and humid area, part trickle carburation by evaporation takes away heat, air constant enthalpy is lowered the temperature, trickle temperature declines, the air of constant enthalpy cooling flows through outside heat exchange module 16 again, after overcooled trickle then falls back cyclic water tank a14, liquid distribution a17 is delivered to through the first feed pipe under the effect of water circulating pump a13, sprayed to outside heat exchange module 16 by liquid distribution a17, with air inversion from bottom to top in the outer heat exchange of heat exchange module 16, take away the recirculated water heat of indirect cool tower 8, reach the object of indirect cool tower 8 recirculated water reducing temperature twice, the air absorbing heat discharges evaporative type cooler 1 after water collection device a15, recirculated water after reducing temperature twice gets back to water treatment of power plant equipment, enters boiler 5 after treatment, continues power generation cycle.
Wherein, the mode that evaporative type cooler 1 adopts ground to arrange is installed, the lift of water circulating pump a13 and water circulating pump b10 is all lower, the trickle internal circulating load of evaporative type cooler 1 is less, to be vaporized outside heat exchange module 16 heat exchange by the trickle after cooling and air, evaporative type cooler 1 trickle water consumption is less, and conveying energy consumption is lower.
The course of work of power plant's cooling system that evaporative type cooler of the present invention is combined with surface-type condensing system is as follows:
1. in the summer high temperature period: the air of outdoor higher temperature is after two air inlets of devaporizer 1 enter, and flow into respectively in vertical pipe type indirect evaporating-cooling unit, at vertical heat exchanging pipe group 22 place, air is divided into two; Portion of air flows through outside heat exchanger tube, another part air flows through in heat exchanger tube, enter the uniform water film countercurrent flow that the air in heat exchanger tube is formed at heat exchanger tube inwall with the water sprayed out through liquid distribution b22, cooling heat transferring inside pipe wall water film temperature, air in heat exchanger tube after hot and humid area, after water collection device b19 process, discharges evaporative type cooler 1 through ventilation window.
2. the air through wet precoolings such as standpipe type indirect evaporation coolers enters in heat exchange module-packing composite cooling unit, flow through evaporative cooling filler 12 place and carry out hot and humid area with the water sprayed through liquid distribution a17 on evaporative cooling filler 12 surface, the water film evaporation on evaporative cooling filler 12 surface, absorb the heat of air and water, cooling-air and trickle, cooled air flows through heat exchange module 16, and the trickle after cooling then flow back in cyclic water tank a14.
Trickle after cooling is delivered to liquid distribution a17 through the first feed pipe and is sprayed out under the effect of water circulating pump a13, outside heat exchange module 16, countercurrent flow is carried out with air, absorb the recirculated water heat of indirect cool tower 8, air discharges evaporative type cooler 1 after eventually passing through the water collection device a15 process of cooling blower a18 bottom, trickle continues to fall heat exchange in evaporative cooling filler 12, finally falls back in cyclic water tank a14.
3. enter in heat exchange module 16 through the cooled recirculated water of indirect cool tower 8 heat exchanger through entering evaporative type cooler circulating water pipe 2, after the trickle outside heat exchange module 16 and Air flow, devaporizer 1 is sent by going out evaporative type cooler circulating water pipe 3, send back to again in the boiler 5 of power plant, continued power generation cycle.
Evaporative type cooler combines with power plant surface-type condensing system by power plant of the present invention cooling system, adopt the evaporative type cooler of evaporation cooling technique, will through the cooled recirculated water of indirect cool tower again by evaporative type cooler reducing temperature twice, when summer high temperature environment, employing twin-stage cools, ensure the cooling effect of recirculated water, can also when hot environment, reduce system back pressure, improve steam turbine power generation efficiency, reduce gross coal consumption rate, in NORTHWEST CHINA area thermal power generation inter-plant cooling system, there is good application prospect.
Claims (10)
1. evaporative type cooler power plant's cooling system of combining with surface-type condensing system, it is characterized in that, include evaporative type cooler (1), described evaporative type cooler (1) is connected with surface condenser (7), indirect cool tower (8) by grid;
Described surface condenser (7) connects and composes closed-loop path with water treatment facilities (4), boiler (5), steam turbine and generator combined unit (6) successively by water pipe.
2. power plant according to claim 1 cooling system, is characterized in that, described evaporative type cooler (1), includes cooler casing, and the two side that described cooler casing is relative is respectively provided with an air inlet;
Be provided with heat exchange module-packing composite cooling unit in described cooler casing, the arranged on left and right sides of described heat exchange module-packing composite cooling unit is respectively provided with a vertical pipe type indirect evaporating-cooling unit;
The top of described heat exchange module-packing composite cooling unit is provided with water collection device a (15), the cooler casing roof that described water collection device a (15) top is corresponding is provided with exhaust outlet, in described exhaust outlet, is provided with cooling blower a (18);
The top of described vertical pipe type indirect evaporating-cooling unit is provided with water collection device b (19), the cooler casing roof that described water collection device b (19) top is corresponding is provided with ventilation window, in described ventilation window, is provided with cooling blower b (20).
3. power plant according to claim 2 cooling system, it is characterized in that, described vertical pipe type indirect evaporating-cooling unit, include vertical heat exchanging pipe group (22), the top of described vertical heat exchanging pipe group (22) is provided with liquid distribution b (21), and described liquid distribution b (21) is made up of shower and the nozzle that is evenly arranged at multiple downward spray on shower;
The below of described vertical heat exchanging pipe group (22) is provided with cyclic water tank b (11), and described cyclic water tank b (11) is connected with shower by the second feed pipe;
Form air channel between described vertical heat exchanging pipe group (22) and cyclic water tank b (11), the housing of cooler body sidewall that air channel is corresponding is provided with overfiren air port.
4. power plant according to claim 3 cooling system, is characterized in that, described vertical heat exchanging pipe group (22) is made up of the heat exchanger tube that many are vertically arranged.
5. power plant according to claim 3 cooling system, is characterized in that, described second feed pipe is provided with water circulating pump b (10).
6. power plant according to claim 2 cooling system, it is characterized in that, described heat exchange module-packing composite cooling unit, include heat exchange module (16), described heat exchange module (16) is connected with described surface condenser (7), indirect cool tower (8) by grid;
The top of described heat exchange module (16) is provided with liquid distribution a (17), and described liquid distribution a (17) is made up of sparge pipe and the nozzle that is evenly arranged at multiple downward spray on sparge pipe;
The below of described heat exchange module (16) is disposed with evaporative cooling filler (12) and cyclic water tank a (14), and described cyclic water tank a (14) is connected with sparge pipe by the first feed pipe.
7. power plant according to claim 6 cooling system, it is characterized in that, the delivery port of described heat exchange module (16) passes through evaporative type cooler circulating water pipe (3) and is connected with surface condenser (7), describedly go out evaporative type cooler circulating water pipe (3) is connected with demineralized water water distributor (9), described demineralized water water distributor (9) passes through to be connected into the water inlet of evaporative type cooler circulating water pipe (2) with heat exchange module (16);
Described surface condenser (7) is connected with indirect cool tower (8) by the first water pipe (23), and described indirect cool tower (8) is connected with demineralized water water distributor (9) by the second water pipe (24).
8. the power plant's cooling system according to claim 6 or 7, is characterized in that, described heat exchange module (16) is heat exchange coil.
9. power plant according to claim 6 cooling system, is characterized in that, described first feed pipe is provided with water circulating pump a (13).
10. power plant according to claim 6 cooling system, is characterized in that, the filler that described evaporative cooling filler (12) is inverted triangle body shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410749009.2A CN104501624B (en) | 2014-12-04 | 2014-12-04 | Evaporative type cooler and surface-type condensing system united power plant cooling system |
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| CN201410749009.2A CN104501624B (en) | 2014-12-04 | 2014-12-04 | Evaporative type cooler and surface-type condensing system united power plant cooling system |
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| CN104501624B CN104501624B (en) | 2016-11-30 |
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Cited By (4)
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| CN105387443A (en) * | 2015-11-25 | 2016-03-09 | 宋宏明 | Novel pressure drawing device of steam boiler |
| CN105953599A (en) * | 2016-05-17 | 2016-09-21 | 山东电力建设第工程公司 | Construction method of condenser |
| CN107462084A (en) * | 2017-07-28 | 2017-12-12 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of combining structure of host machine cooling system and subsidiary engine cooling system |
| CN114877711A (en) * | 2021-02-05 | 2022-08-09 | 浙江高晟光热发电技术研究院有限公司 | Wet and dry type cooler |
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| CN101063595A (en) * | 2006-04-26 | 2007-10-31 | 北京国电华北电力工程有限公司 | SCAL indirect air cooling system |
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| CN107462084A (en) * | 2017-07-28 | 2017-12-12 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of combining structure of host machine cooling system and subsidiary engine cooling system |
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| CN104501624B (en) | 2016-11-30 |
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