CN102650486A - Closed water cooling system being capable of producing condensed water - Google Patents
Closed water cooling system being capable of producing condensed water Download PDFInfo
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- CN102650486A CN102650486A CN2012100038353A CN201210003835A CN102650486A CN 102650486 A CN102650486 A CN 102650486A CN 2012100038353 A CN2012100038353 A CN 2012100038353A CN 201210003835 A CN201210003835 A CN 201210003835A CN 102650486 A CN102650486 A CN 102650486A
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Abstract
The invention relates to a closed water cooling system being capable of producing condensed water, and provides the closed water cooling system for thermal power stations, which solves the closed water cooling problem under the weather conditions of high-temperature humidity and high-temperature drought. The closed water cooling system comprises a closed water cooler body which can produce the condensed water, a vacuum butterfly valve A, a vacuum butterfly valve B, a membranization water pump, a steam ejector A, a steam ejector B, an ultrafiltration industrial water replenishing pipe, an ultrafiltration industrial water replenishing control valve, a salt balance drain valve, a five-section steam extraction and admission control valve, a station auxiliary steam admission control valve, a liquid level sensor and a distributed control system (DCS); a vacuum system, a condensate system, an auxiliary steam extraction system, a heat regenerative system and the like which exist in a turboset are fully utilized, a water evaporation cooling method under high vacuum condition is adopted to solve the problem that the turboset capacity is limited due to the overhigh closed water temperature and to improve the cooling conditions of a main and auxiliary units, and the heat which is dissipated by hot closed water can be utilized to produce the condensed water; and meanwhile, the power consumption and investment of the closed water system are greatly reduced.
Description
(1) technical field:
The enclosed water cooling system that the present invention can produce condensate relates to the enclosed water cooling system that a kind of thermal power station uses.
(2) background technology:
The enclosed water that the thermal power station of prior art uses is the demineralized water of closed cycle; Comprise as its user of enclosed water of cooling medium the hydrogen-cooled device of steam turbine generator, steam turbine generator inner cold water cooler, the various water pumps of steam turbine side sealing water cooler, the multiple pump motor of steam turbine side water-air cooling but device, bearing cooler, little machine main oil pump bearing cooler, vavuum pump working seal water cooler, steam turbine ram's horn cooler, high pressure main inlet throttle-stop valve cooler, reheat stop interceptor valve cooler, pressure fan motor water-air cooling but device, control oil station cooler, primary air fan motor water-air cooling but device, lubricated and control oil station cooler, id-motor water-air cooling but device, lubricated and control oil station cooler, air preheater bearing oil cooler, hydrogen generator station cooler, chemical sampling frame cooler, coal pulverizer bearing oil cooler, start boiler water circulating pump with cooler etc., enclosed water is the essential condition that guarantees thermal power station's main and auxiliaries safe operation.The heat that hot enclosed water carries is taken away by open circulation water in the enclosed water cooler.
The normally used enclosed water cooler of prior art thermal power station is a plate type heat exchanger, also has the minority power station to use shell-and-tube heat exchanger.Plate type heat exchanger and shell-and-tube heat exchanger are the water water heat exchanger, promptly in heat exchange plate both sides, heat exchanger tube the outside, working medium is the forced convection heat release to the heat transfer type of wall.
Plate type heat exchanger is a kind of high-performance heat exchanger of compact conformation; With countercurrent heat exchange method work, its cold junction end difference is 5K usually, reduces the enclosed coolant-temperature gage like expectation with the method that further reduces cold junction end difference; Improve the cooling effect of enclosed water; Its cost is the plate number that increases investment, increases plate type heat exchanger, and cold junction end difference is reduced to 3.5K from 5K, and investment increases by 40% approximately.
Process with world industryization; The freshwater resources growing tension; Particularly be fit to low calcium, magnesium ion that the enclosed water cooler directly uses, the freshwater resources of low chlorine root, low solid content, low oxygen demand are more rare, and thermal power station's use seawater, municipal middle water are increasing as the case of open circulation water or the use of open circulation water supplementing water; The material of the plate of plate type heat exchanger and the heat-transfer pipe of shell-and-tube heat exchanger is used better and better, but the average fault-free hourage of enclosed water cooler does not rise counter falling.
In order to build the large electric power plant station in the drought and water shortage area; Prior art has been developed air cooling fired power generating unit (comprising Direct Air-Cooled and indirect air cooling); The air cooling fired power generating unit is that safe production in summer is designed with the small-sized wet type circulating water cooling system of a cover usually; Aim at the enclosed water cooler open circulation water is provided, the water consumption that this kind design not only increased considerably capital expenditure, increased considerably the air cooling fired power generating unit also may not necessarily solve the too high problem of air cooling fired power generating unit enclosed in summer coolant-temperature gage.
(3) summary of the invention:
Technical problem to be solved:
Under hot and humid meteorological condition; When the open circulation coolant-temperature gage surpasses 33 ℃; The enclosed coolant-temperature gage will be above 38 ℃, because the enclosed coolant-temperature gage is the essential condition that guarantees thermal power station's main and auxiliaries safe operation, the enclosed coolant-temperature gage surpasses 38 ℃ possibly cause that the Turbo-generator Set limit exerts oneself.The thermal power station of south China had within 1 year count the open circulation coolant-temperature gages more for a long time above 33 ℃; Thermal power station's open circulation coolant-temperature gage to Southeast Asia can become normality above 33 ℃; To the fired power generating unit of the water-deficient area of adopting Direct Air-Cooled or indirect air cooling, also have within 1 year and count the enclosed coolant-temperature gages more for a long time and surpass 38 ℃, the Turbo-generator Set of prior art can only be dealt with forced partial outage.
When the open circulation coolant-temperature gage surpasses 33 ℃, reduce the enclosed coolant-temperature gage with the method that reduces cold junction end difference, not only costly but also effect is limited, cold junction end difference can not drop to 0.
The enclosed water cooler of prior art is the heat transfer temperature and pressure of design to guarantee to be necessary between enclosed water side and the open type water side of enclosed water side still to be open type water side take usually low temperature rise, high flow capacity no matter; For improving the heat transfer coefficient of plate type heat exchanger, adopt the design of high reynolds number, high turbulence level usually, its cost is High Pressure Difference, high energy consumption; The equivalent diameter of plate type heat exchanger runner has only about 7mm, stops up for preventing runner, must dispose from removing contamination filter screen in open circulation water side, has increased the energy consumption of open circulation water booster again; Jumbo board-like enclosed water cooler needs import, costs an arm and a leg.
Air cooling fired power generating unit in the construction of high temperature and drought water-deficient area is that safe production in summer is designed with the small-sized wet type circulating water cooling system of a cover usually; Aim at the enclosed water cooler open circulation water is provided, the water consumption that this kind design not only increased considerably capital expenditure, increased considerably the air cooling fired power generating unit also may not necessarily solve the too high problem of air cooling fired power generating unit enclosed in summer coolant-temperature gage.
Solve the technical scheme that its technical problem adopts:
The purpose of this invention is to provide a kind of enclosed water cooling system that can produce condensate takes to solve under the meteorological condition of hot and humid or high temperature and drought with the diverse technology path of prior art; When the open circulation coolant-temperature gage surpasses 33 ℃, the problem that the enclosed coolant-temperature gage will be above 38 ℃.The present invention abandons with open circulation water and goes to cool off the routine of closing water recirculated water; Make full use of systems such as the existing vacuum system of Steam Turbine, condensate system, auxiliary steam bleeding system, heat regenerative system; Be employed in the transpiration-cooled method of water under the high vacuum condition and solve the problem that the too high restriction Turbo-generator Set of enclosed coolant-temperature gage is exerted oneself and improved main and auxiliary machine cooling condition, and hot enclosed water liberated heat capable of using is produced condensate; Reduce simultaneously the power consumption and the investment of closed Water System significantly.
Existing is 2000t/h with an enclosed discharge, and the enclosed water cooler that 7K (reducing to 38 ℃ for 45 ℃) falls in the enclosed water temperature is the example explanation: enclosed water enthalpy drop 29.25kJ/kg, 2000t/h heat release 58.5 * 10 altogether
6KJ/h, rising like the open circulation water temperature also is 7K (33 ℃ rise to 40 ℃), open circulation discharge needs 2000t/h.Water is that 2484.38kJ/kg is to 2432.31kJ/kg at vacuum state 0.001MPa (a) to the interval latent heat of vaporization of 0.004MPa (a); As long as the water of evaporation 23.8t/h under this vacuum state interval; Its caloric receptivity and temperature rise 7K, the open circulation water of flow 2000t/h are together.Water is 6.97 ℃ to 28.96 ℃ at vacuum state 0.001MPa (a) to the interval saturation temperature (also claiming boiling temperature) of 0.004MPa (a), quite is lower than 33 ℃; The boiling coefficient of water is much larger than the forced convection exothermic coefficient; The hot enclosed water liberated heat of 2000t/h can produce the water vapour of 23.8t/h under high vacuum condition, these water vapours will condense, reclaim in No. 8 low-pressure heaters (12) and/or condenser (13).
The enclosed water cooling system that the present invention can produce condensate comprises enclosed water cooler body (1), vacuum butterfly valve A (2), vacuum butterfly valve B (3), membranization water pump (4), steam jet ejector A (5), steam jet ejector B (6), ultrafiltration industry water filling pipe (7), ultrafiltration industry water moisturizing control valve (8), salt balance draining valve (9), 5 sections the admission control valves (10) that draw gas, the auxilliary vapour admission control valve (11) of station-service, liquid level sensor and DCS control systems that can produce condensate; The 0.001MPa (a) that can produce the enclosed water cooling system needs of condensate realizes with steam jet ejector A (5) and/or steam jet ejector B (6) to the interval vacuum state of 0.004MPa (a); The nozzle of steam jet ejector A (5) is by 5 sections admission control valve (10) steam supplies that draw gas; The nozzle of steam jet ejector B (6) is by auxilliary vapour admission control valve (11) steam supply of station-service; The diffuser exit of steam jet ejector A (5) connects the vapour side of No. 8 low-pressure heaters (12) of steamer pusher side, reclaims heat, the hot well of condensate backflow condenser (13) by the main frame condensate; The diffuser exit of steam jet ejector B (6) connects condenser (13) vapour side, and condensate imports the hot well of condenser (13); The aperture of the keying of vacuum butterfly valve A (2), vacuum butterfly valve B (3) and 5 sections admission control valves (10) that draw gas, the auxilliary vapour admission control valve (11) of station-service is with being controlled by DCS control system, with least energy consumption control enclosed water outlet temperature in best target value; The industry water that does not have solid content and do not have colloid silicon through ultrafiltration gets into the housing of the enclosed water cooler body (1) that can produce condensate through ultrafiltration industry water moisturizing control valve (8), ultrafiltration industry water filling pipe (7); The aperture of ultrafiltration industry water moisturizing control valve (8) is controlled by liquid level sensor and DCS control system, keeps the U type tube bank about 50mm in bottom that can produce the enclosed water cooler body (1) of condensate based on the water flooding in transpiration-cooled enclosed water cooler body (1) housing; Can produce through the industry water that ultrafiltration does not have solid content and do not have colloid silicon in the enclosed water cooler body (1) of condensate and concentrated; The aperture of control salt balance draining valve (9) can be controlled concentration rate, reaches the minimum target of U type tube bank non-scaling while salt balance displacement of the enclosed water cooler body (1) that can produce condensate.
Can produce the enclosed water cooler body (1) of condensate mainly is made up of the tube bank of U type, vacuum involucrum, membranization water dispenser, low-resistance dehydrater, steam outlet; Enclosed water is mobile in the pipe of U type tube bank, and the pipe outer surface of U type tube bank is accepted the water droplet under the even pouring of membranization water dispenser, at the pipe outer surface formation moisture film of U type tube bank; Moisture film evaporates heat absorption under high vacuum condition, the heat release of enclosed water, and water vapour condenses, reclaims in No. 8 low-pressure heaters (12) and/or condenser (13), and completion can be produced the function of the enclosed water cooling system of condensate.
Membranization water pump (4) gets into the membranization water dispenser of the enclosed water cooler body (1) that can produce condensate from the bottom water retention zone suction of enclosed water cooler body (1) the vacuum involucrum that can produce condensate after the supercharging; Exert oneself into evaporated quantity of water 2 to 5 times of the flow of membranization water pump (4); The membranization of water is handled gimmick and is effectively reduced the evaporation of water temperature, has significantly improved the cooling performance of the enclosed water cooling system that can produce condensate.
The enclosed water cooling system that the present invention can produce condensate also is appreciated that to being the jetting type heat pump with steam jet ejector A (5); Is hot enclosed water liberated heat nationality low-pressure steam that carrier carries back No. 8 low-pressure heaters (12) to recycle; Become the part of Steam Turbine heat regenerative system, effectively reduce the hear rate of Turbo-generator Set; Steam jet ejector A (5) adopts steam turbine to draw gas for 5 sections can reduce the Turbo-generator Set hear rate; Steam jet ejector B (6) adopts 0.8MPa to solve Turbo-generator Set 5 sections not enough problems of extraction pressure under startup operating mode and running on the lower load to the auxilliary vapour of the station-service of 1.3MPa; Also improved the controllability of enclosed water out water temperature, making the enclosed water temperature be lower than the open type water temperature becomes the possibility option; The diffuser exit of steam jet ejector B (6) connect condenser (13) make the present invention can be under high back pressure Direct Air-cooled Unit summer condition operate as normal.
The present invention can be used for designing new power station, and employing can be produced the enclosed water cooling system of condensate, also can be used for the transformation of prior art at the enclosed water cooling system in labour power station.
The beneficial effect of the invention:
That perfection has solved is hot and humid, but problem of enclosed water-cooled under the high temperature and drought meteorological condition, avoids occurring the phenomenon of exerting oneself because of the high restriction of enclosed coolant-temperature gage Turbo-generator Set;
Be specially adapted to Direct Air-Cooled or indirect air cooling Turbo-generator Set, avoid occurring limiting the phenomenon that Turbo-generator Set is exerted oneself, reduce closed Water System capital expenditure and zero water consumption significantly because of the enclosed coolant-temperature gage is high;
Improve the cooling condition of thermal power station's main and auxiliaries, guarantee the generating set safe operation;
The heat-pump-type operation principle, the enclosed coolant-temperature gage can be lower than the open circulation coolant-temperature gage;
The upgraded product of large-scale plate type heat exchanger, import substitution significantly reduces the investment of enclosed hydrothermal exchange system;
No open circulation water booster power consumption significantly reduces enclosed water-circulating pump power consumption;
Recyclable enclosed water liberated heat is produced condensate, reduces the Turbo-generator Set hear rate.
(4) description of drawings:
Fig. 1 is for producing the enclosed water cooling system structure chart of condensate.
At Fig. 1:
1 can produce condensate enclosed water cooler body, 2 vacuum butterfly valve A,
3 vacuum butterfly valve B, 4 membranization water pumps,
5 steam jet ejector A, 6 steam jet ejector B,
7 ultrafiltration industry water filling pipes, 8 ultrafiltration industry water moisturizing control valves,
9 salt balance draining valves, 10 5 sections admission control valves that draw gas,
11 station-services assist vapour admission control valve, 12 No. 8 low-pressure heaters,
13 condensers.
(5) specific embodiment:
Existing is 2000t/h with an enclosed discharge, and 7K falls in the enclosed water temperature, reduces to 30 ℃ from 37 ℃, the enclosed water cooling system that can produce condensate be the optimal way that the example explanation realizes invention:
The enclosed water cooling system that the present invention can produce condensate comprises enclosed water cooler body (1), vacuum butterfly valve A (2), vacuum butterfly valve B (3), membranization water pump (4), steam jet ejector A (5), steam jet ejector B (6), ultrafiltration industry water filling pipe (7), ultrafiltration industry water moisturizing control valve (8), salt balance draining valve (9), 5 sections the admission control valves (10) that draw gas, the auxilliary vapour admission control valve (11) of station-service, liquid level sensor and DCS control systems that can produce condensate; The 0.001MPa (a) that can produce the enclosed water cooling system needs of condensate realizes with steam jet ejector A (5) and/or steam jet ejector B (6) to the interval vacuum state of 0.004MPa (a); The nozzle of steam jet ejector A (5) is by 5 sections admission control valve (10) steam supplies that draw gas; The nozzle of steam jet ejector B (6) is by auxilliary vapour admission control valve (11) steam supply of station-service; The diffuser exit of steam jet ejector A (5) connects the vapour side of No. 8 low-pressure heaters (12) of steamer pusher side, reclaims heat, the hot well of condensate backflow condenser (13) by the main frame condensate; The diffuser exit of steam jet ejector B (6) connects condenser (13) vapour side, and condensate imports the hot well of condenser (13); The aperture of the keying of vacuum butterfly valve A (2), vacuum butterfly valve B (3) and 5 sections admission control valves (10) that draw gas, the auxilliary vapour admission control valve (11) of station-service is with being controlled by DCS control system, with least energy consumption control enclosed water outlet temperature in best target value; The industry water that does not have solid content and do not have colloid silicon through ultrafiltration gets into the housing of the enclosed water cooler body (1) that can produce condensate through ultrafiltration industry water moisturizing control valve (8), ultrafiltration industry water filling pipe (7); The aperture of ultrafiltration industry water moisturizing control valve (8) is controlled by liquid level sensor and DCS control system, keeps the U type tube bank about 50mm in bottom that can produce the enclosed water cooler body (1) of condensate based on the water flooding in transpiration-cooled enclosed water cooler body (1) housing; Can produce through the industry water that ultrafiltration does not have solid content and do not have colloid silicon in the enclosed water cooler body (1) of condensate and concentrated; The aperture of control salt balance draining valve (9) can be controlled concentration rate, reaches the minimum target of U type tube bank non-scaling while salt balance displacement of the enclosed water cooler body (1) that can produce condensate.
The vacuum involucrum is made up of the compound carbon steel sheet welding of 8mm stainless steel, also can use the inboard thermal spraying 0.3mm of 8mm carbon steel sheet stainless steel layer to substitute; The vacuum involucrum outside is welded with reinforcement, and the heat insulation layer all standing is arranged.
The tube bank of U type is made up of nominal diameter Ф 19 * 1 seamless stainless steel convergent-divergent pipes, and the chlorine root of stainless steel and industry water is complementary, and can be martensitic stain less steel, austenitic stainless steel or two phase stainless steel; Tube sheet is the thick stainless steel of 35mm, carbon steel composite plate; U type tube and tube plate connects with the back weldering mode that expands earlier; U type tube bank nominal gross area 600m
2
Membranization water pump (4) 100m that exerts oneself
3/ h, lift 29m.
Membranization water pump (4) and built-in membranization water dispenser, the low-resistance dehydrater of enclosed water cooler body (1) that can produce condensate are stainless steel.
Vacuum butterfly valve A (2), vacuum butterfly valve B (3) are the two eccentric vacuum butterfly valves of soft seal, and valve rod is furnished with water seal arrangement.
Steam jet ejector A (5), steam jet ejector B (6) are the martensitic stain less steel material.
The enclosed water cooling system that the present invention can produce condensate should be arranged in Turbine Island 6m layer, nearly condenser throat.
Claims (5)
1. the enclosed water cooling system that can produce condensate is characterized in that: comprise enclosed water cooler body (1), vacuum butterfly valve A (2), vacuum butterfly valve B (3), membranization water pump (4), steam jet ejector A (5), steam jet ejector B (6), ultrafiltration industry water filling pipe (7), ultrafiltration industry water moisturizing control valve (8), salt balance draining valve (9), 5 sections the admission control valves (10) that draw gas, the auxilliary vapour admission control valve (11) of station-service, liquid level sensor and DCS control systems that can produce condensate; The 0.001MPa (a) that can produce the enclosed water cooling system needs of condensate realizes with steam jet ejector A (5) and/or steam jet ejector B (6) to the interval vacuum state of 0.004MPa (a); The nozzle of steam jet ejector A (5) is by 5 sections admission control valve (10) steam supplies that draw gas; The nozzle of steam jet ejector B (6) is by auxilliary vapour admission control valve (11) steam supply of station-service; The diffuser exit of steam jet ejector A (5) connects the vapour side of No. 8 low-pressure heaters (12) of steamer pusher side, reclaims heat, the hot well of condensate backflow condenser (13) by the main frame condensate; The diffuser exit of steam jet ejector B (6) connects condenser (13) vapour side, and condensate imports the hot well of condenser (13); The aperture of the keying of vacuum butterfly valve A (2), vacuum butterfly valve B (3) and 5 sections admission control valves (10) that draw gas, the auxilliary vapour admission control valve (11) of station-service is with being controlled by DCS control system, with least energy consumption control enclosed water outlet temperature in best target value; The industry water that does not have solid content and do not have colloid silicon through ultrafiltration gets into the housing of the enclosed water cooler body (1) that can produce condensate through ultrafiltration industry water moisturizing control valve (8), ultrafiltration industry water filling pipe (7); The aperture of ultrafiltration industry water moisturizing control valve (8) is controlled by liquid level sensor and DCS control system, keeps the U type tube bank about 50mm in bottom that can produce the enclosed water cooler body (1) of condensate based on the water flooding in transpiration-cooled enclosed water cooler body (1) housing; Can produce through the industry water that ultrafiltration does not have solid content and do not have colloid silicon in the enclosed water cooler body (1) of condensate and concentrated; The aperture of control salt balance draining valve (9) can be controlled concentration rate, reaches the minimum target of U type tube bank non-scaling while salt balance displacement of the enclosed water cooler body (1) that can produce condensate.
2. the enclosed water cooling system that can produce condensate according to claim 1 is characterized in that the described enclosed water cooler body (1) that can produce condensate mainly is made up of the tube bank of U type, vacuum involucrum, membranization water dispenser, low-resistance dehydrater, steam outlet.
3. the enclosed water cooling system that can produce condensate according to claim 1; It is characterized in that the bottom water retention zone suction of described membranization water pump (4), get into membranization water dispenser after the supercharging based on transpiration-cooled enclosed water cooler body (1) from enclosed water cooler body (1) the vacuum involucrum that can produce condensate; Exert oneself into evaporated quantity of water 2 to 5 times of the flow of membranization water pump (4).
4. the enclosed water cooling system that can produce condensate according to claim 1; It is characterized in that described steam jet ejector A (5) is the jetting type heat pump; Is hot enclosed water liberated heat nationality low-pressure steam that carrier carries back No. 8 low-pressure heaters (12) to recycle; Become the part of Steam Turbine heat regenerative system, effectively reduce the hear rate of Turbo-generator Set.
5. the enclosed water cooling system that can produce condensate according to claim 1, the diffuser exit that it is characterized in that described steam jet ejector B (6) connect condenser (13) make the present invention can be under high back pressure Direct Air-cooled Unit summer condition operate as normal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210003835.3A CN102650486B (en) | 2012-01-09 | 2012-01-09 | Closed water cooling system being capable of producing condensed water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210003835.3A CN102650486B (en) | 2012-01-09 | 2012-01-09 | Closed water cooling system being capable of producing condensed water |
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| CN102650486A true CN102650486A (en) | 2012-08-29 |
| CN102650486B CN102650486B (en) | 2014-04-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748963A (en) * | 2012-07-10 | 2012-10-24 | 章礼道 | Closed water cooling system with double-evaporative cooling pressure |
| CN114087039A (en) * | 2021-11-15 | 2022-02-25 | 山东日照发电有限公司 | Energy-saving improvement method for cooling mode of closed water heat exchanger after unit shutdown |
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| JPS5771249A (en) * | 1980-10-22 | 1982-05-04 | Toshiba Corp | Controlling device for cooler |
| JPH01234773A (en) * | 1988-03-15 | 1989-09-20 | Gunma Netsu Kanri Center:Kk | Method of cooling object using filtered air |
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| RU2071162C1 (en) * | 1993-01-29 | 1996-12-27 | Специальное конструкторско-технологическое бюро по высоковольтной и криогенной технике Мосэнерго | Hydrogen drier in electric generator cooling system |
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| CN102748963A (en) * | 2012-07-10 | 2012-10-24 | 章礼道 | Closed water cooling system with double-evaporative cooling pressure |
| CN102748963B (en) * | 2012-07-10 | 2014-01-15 | 章礼道 | Closed water cooling system with double-evaporative cooling pressure |
| CN114087039A (en) * | 2021-11-15 | 2022-02-25 | 山东日照发电有限公司 | Energy-saving improvement method for cooling mode of closed water heat exchanger after unit shutdown |
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|---|---|
| CN102650486B (en) | 2014-04-02 |
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