CN101182088A - Novel technique for quality-preservation treatment of sugar plant circulation cooling water - Google Patents
Novel technique for quality-preservation treatment of sugar plant circulation cooling water Download PDFInfo
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- CN101182088A CN101182088A CNA2007100663851A CN200710066385A CN101182088A CN 101182088 A CN101182088 A CN 101182088A CN A2007100663851 A CNA2007100663851 A CN A2007100663851A CN 200710066385 A CN200710066385 A CN 200710066385A CN 101182088 A CN101182088 A CN 101182088A
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Abstract
The invention relates to a treatment technology and equipment of circulating cooling water of a sugar factory juice steam condensing system. The technology process includes steps as follows: firstly, pH value of the circulating cooling water is regulated to be neutralized through alkaline materials; secondly, circulating water in a circulating a circulating water tank is rotated; the third step is to cool mixed steam condensing water after fetching a part of heat and supplement the circulating water in the circulating water tank; and fourthly, a part of the cooling water which has circulated for many times is heated to be at the temperature of about 65 degree Celsius after being filtered through an ultra-filtration membrane system and is sent to the press to be used as pressing infiltration water, or a part of the cooling water which has circulated for many times is sent to a boiler to be used as ash water, and the circulating water is recharged again through the settlement and the filtration. The equipment includes the circulating water tank, a cooling tower, a condenser, the ultra-filtration system, a heat exchanger, a boiler water membrane dust removing and ash sluicing system and a sediment pool. The invention can ensure the circulating cooling water to be not metamorphic and stink. The mixed steam condensing water and the part of the cooling water which has circulated for many times are ensured to be utilized reasonably. A large quantity of production water is saved for sugar manufacturing factories. No sewage is discharged. The investment is saved. And the invention has the advantages of low operating cost and stable operation.
Description
Technical field
The present invention relates to a kind of improvement of sugar refining technology, particularly the treatment process of sugar refinery juice vapour condenser system recirculated cooling water.
Background technology
Sugar refinery vacuum condensation system need be with a large amount of water coolants, and for water-saving and emission-reducing, water coolant must recycle.Owing to evaporate and boil sugared juice vapour water of condensation and contain micro-SO
2(water-soluble formation sulfurous acid) and micro sugar, and bring in the recirculated cooling water, concentration increases to make recirculated cooling water repeatedly circulate afterwards in circulating water pool, and at a certain temperature, it is smelly to cause recirculated cooling water to turn sour, and can not recycle for a long time.At present, the former water of a large amount of low temperature is extracted in most of sugar refinery, and circulating water pool internal recycle water coolant makes its acquisition can keep the Pollutant levels and the temperature of sugar refinery ordinary production by turns.Here it is causes a large amount of former water, the major causes that discharging COD total amount exceeds standard of extracting in sugar refinery.
Relevant open source literature has been reported the comprehensive utilization method of some sugar refinery condenser system water coolants, for example:
1, Chinese patent: application number: 200610124164.0 applyings date: 2006.12.12 title: boil sugared water of productive use comprehensive utilization method and equipment, application (patent right) people: Guitang (Group) Co Ltd, Guangxi address: No. 100 summaries in Guigang, Guangxi, Guigang, 537102 Guangxi Zhuang Autonomous Region happiness road: the present invention a kind ofly will boil water coolant in the sugared condensate vacuum system and water of condensation separately and the method and apparatus that all utilizes again, it is that the juice gas and the water coolant of the outlet of boiling pan top are introduced indirect condenser simultaneously, in indirect condenser, juice gas is walked different passages with water coolant, condenser is connected to vacuum pump, the boiling pan top is gone out the interruption-forming vacuum, juice gas leads in the holding tank in the indirect condenser condensation, as process water by sugar refinery's reuse, and water coolant leads to spray pond or hot water storage tank after the indirect condenser outlet, uses as producing hot water or domestic hot-water.Not only, also alleviated the harm that sewage discharge brings to environment for sugar enterprise has saved water of productive use.
2, design optimization [author] Bei Deguang of [autograph] cane sugar factory circulating water cooling system [periodical name] Guangxi light industry .1996 (1) .-28-31[keyword] round-robin cooling system wastewater treatment sugar refinery [digest] cane sugar factory is the water rich and influential family, water conservation is even more important.This paper author is after participating in the design of a plurality of sugar refinery, by to each sugar refinery design and the actual motion effect Analysis of circulating water supply system in the past, especially cooling tower and spray cooler cooling system commonly used are analyzed, find out existing problem, propose the way of solution, and sum up the optimization design flow process.The flow process of periodical feeding and blowdown system is as follows: source water enters boiler, Closed Circulation in Sugar Production, cooling and as domestic water through purifying, water coolant enters after the balancing tank water and is pumped into the first and second the third condensers, pan boiling system is cooled off, the water of discharging with equipment such as vaporizer and ponds, workshop also enters the balancing tank, part water coolant and sanitary sewage directly are discharged into (this article has been narrated the flow process of transforming front and back periodical feeding and blowdown system with 2 accompanying drawings, sees original text) in the environment.
Above-mentioned open source literature 1 is mentioned water of condensation and be can be used as process water by sugar refinery's reuse, and water coolant leads to spray pond or hot water storage tank after the indirect condenser outlet, uses as producing hot water or domestic hot-water.Document 2 is provided with a balancing tank, the part water coolant is concentrated called, and has also solved in the past the directly water resource waste problem of discharging, but above-mentioned document does not also have finally to solve the recirculated cooling water of cooling-water drain and the balancing tank smelly problem of turning sour.
Summary of the invention
The purpose of this invention is to provide a kind of can solve existing sugar plant circulation cooling water in circulating water pool repeatedly circulation back concentration increase, it is smelly that recirculated water is turned sour, the problem that can not recycle for a long time.
For achieving the above object, the present invention adopts novel technique for quality-preservation treatment of sugar plant circulation cooling water, can solve the problem of sugar refinery zero water intaking zero release, just need improve the water quality of recirculated cooling water for this reason, guarantee the permanent circulation of recirculated water and not corrupt, not smelly, form the independent closed cycle water system that does not efflux.
The technological process of sugar refinery of the present invention condenser system recirculated cooling water treatment process is as follows:
One, use alkaline material, generally adopt milk of lime, liming or sodium hydroxide, perhaps ash-flushing water is regulated the pH value of recirculated cooling water, makes it arrive neutral (between the about 7-7.5 of PH).Owing to evaporate and boil in the sugared juice vapour water of condensation and contain micro-SO
2Composition and sugar after circulation repeatedly, acid strengthen very soon, and perishable corruption and smelly need add the alkali neutralization, thereby guarantee that recirculated cooling water never degenerates, nondiscoloration, not smelly.
Two, rotate circulating water pool internal recycle water coolant, improve the water quality in the circulating water pool, guarantee that recirculated cooling water recycles for a long time.Under existing Technology equipment, concentration increases micropollutant along with the prolongation of cycling time in the recirculated water, finally will efflux.For addressing this problem, the juice vapour water of condensation sugar degree of having only the control evaporation and boiling sugar, after the recirculated cooling water sugar-containing concentration is higher than juice vapour water of condensation sugar-containing concentration, take out and use the part recirculated cooling water, replenish simultaneously and lowly contain sugared clean vapour and coagulate water, coagulate containing of water of sugared total amount owing to the water coolant that goes out circulating water pool contains sugared total amount greater than additional vapour, then its sugar degree of recirculated cooling water and pollutent can not raise again.
Three, the mixed steam behind the part heat removal is water-cooled to about 30 ℃ with fixed attention replenishment cycles pond internal recycle water.
Four, will part through round-robin water coolant repeatedly after ultrafiltration membrane system is filtered, remove suspended substance, microorganism, colloid is warming up to then and send squeezing as the squeezing infiltration water about 65 ℃; Perhaps send boiler as towards buck through round-robin water coolant repeatedly part,, utilize cindery adsorption to remove part colloid and sugar part through the high temperature killing microorganisms, again through sedimentation, filtration, the covering recirculated cooling water; Also desirable part recirculated cooling water promotes rotating of recirculated cooling water as other water with this simultaneously, improves the water quality in the circulating water pool.
The equipment that above-mentioned novel technique for quality-preservation treatment of sugar plant circulation cooling water adopts comprises circulating water pool, cooling tower, condenser, ultrafiltration system and interchanger, wherein cooling tower, condensator outlet are received circulating water pool, the circulating water pool outlet connects ultrafiltration system, and heat exchanger inlet and outlet connects cooling tower and ultrafiltration system.
The equipment that above-mentioned novel technique for quality-preservation treatment of sugar plant circulation cooling water adopts also can comprise circulating water pool, cooling tower, condenser, boiler water film dedusting and Ash Removal System, detritus pool and filtering system, wherein cooling tower, condensator outlet are received circulating water pool, the circulating water pool outlet connects boiler water film dedusting and Ash Removal System, boiler water film dedusting and Ash Removal System connect detritus pool, and detritus pool connects cooling tower and circulating water pool after taking over filtering system.The difference of this complete equipment just connects boiler water film dedusting and Ash Removal System with the circulating water pool outlet, and its treatment process principle is the same.
The present invention compared with prior art, its outstanding substantive distinguishing features and obvious improvement is:
1, guarantee that recirculated cooling water never degenerates, nondiscoloration, not smelly, circulating water pool internal recycle water coolant improves the water quality in the circulating water pool by turns, guarantees that recirculated cooling water recycles for a long time.
2, Closed Circulation in Sugar Production waste water reclaiming, mixed steam coagulate water and the part repeatedly the round-robin water coolant all obtain reasonable use.
3, for sugar enterprise has saved a large amount of water of productive use, need not replenish source water, alleviate the harm that sewage discharge brings to environment yet.
4, this novel process is compared with dividing wall type condensation process, biochemical terminal treatment process, has advantages such as reduced investment, working cost are low, stable operation.
Description of drawings
Fig. 1 is the schema of novel technique for quality-preservation treatment of sugar plant circulation cooling water of the present invention, and clean water is as the squeezing infiltration water.
Fig. 2 is the schema of novel technique for quality-preservation treatment of sugar plant circulation cooling water of the present invention, and recirculated water is as ash-flushing water.
As shown in Figure 1, the equipment that this condenser system recirculated cooling water treatment process adopts comprises circulating water pool 4, cooling tower 2, condenser 3, ultrafiltration system 5 and interchanger 1, wherein circulating water pool 4 is received in cooling tower 2, condenser 3 outlets, circulating water pool 4 outlets connect ultrafiltration system 5, ultrafiltration system 5 connects interchanger 1, and heat exchanger exit connects cooling tower 2.
Idiographic flow is as follows: mixed steam coagulate water at first enter interchanger 1 (interchanger 1 can be recuperative heat exchangers such as plate-type heat exchanger, spiral-plate exchanger, shell and tube heat exchanger) with the squeezing infiltration water carry out thermal exchange, enter cooling tower 2 then, be cooled to about 30 ℃, enter circulating water pool 4 again, as the additional water source of circulating water pool internal cooling water; Enter circulating water pool 4 from condenser 3 effusive secondary juice vapour water of condensation with water coolant, add milk of lime or liming, perhaps sodium hydroxide, make it arrive neutral (between the about 7-7.5 of PH), enter cooling tower 2 then and be cooled to enter circulating water pool 4 about 30 ℃, recycle; Part through round-robin water coolant repeatedly through ultrafiltration system 5 (ultrafiltration system comprises ultrafiltration membrance filter equipment, pre-processing device, row is dense and back-washing equipment, automatic control equipment, pump etc.), remove suspended substance, microorganism, colloid, enter then interchanger 1 be warming up to send about 65 ℃ the squeezing as the squeezing infiltration water; Part also can be used as other purposes through round-robin water coolant repeatedly, draws circulating water pool 4, with this promote recirculated cooling water by turns, improve the water quality in the circulating water pool.Most of recirculated cooling water uses at system's internal recycle, if the water yield reduces in the circulating water pool 4, can strengthen the magnitude of recruitment that mixed steam coagulates water.
As shown in Figure 2, the equipment that this condenser system recirculated cooling water treatment process adopts comprises circulating water pool 4, cooling tower 2, condenser 3, boiler water film dedusting and Ash Removal System 6, detritus pool and filtering system 7, wherein circulating water pool 4 is received in cooling tower 2, condenser 3 outlets, circulating water pool 4 outlets connect boiler water film dedusting and Ash Removal System 6, boiler water film dedusting and Ash Removal System 6 connect detritus pool 7, and detritus pool 7 connects cooling tower 2 and circulating water pool 4 after taking over filtering system 7.
Idiographic flow is as follows: enter circulating water pool 4 from condenser 3 effusive secondary juice vapour water of condensation with water coolant, add milk of lime, liming or sodium hydroxide, make it arrive neutral (between the about 7-7.5 of PH), entering cooling tower 2 then is cooled to about 30 ℃, enter circulating water pool 4, recycle; Part enters boiler water film dedusting and Ash Removal System 6 through round-robin water coolant repeatedly, through the high temperature killing microorganisms, utilize cindery adsorption to remove part colloid and sugar part, again through detritus pool 7 and filtering system 8, remove suspended substance and lime-ash, enter cooling tower 2 then and be cooled to about 30 ℃, the covering recirculated cooling water; The part recirculated cooling water also can be used as other purposes, draws circulating water pool 4, promotes rotating of recirculated cooling water with this, improves the water quality in the circulating water pool.Most of recirculated cooling water uses at system's internal recycle, if the water yield reduces in the circulating water pool 4, can make mixed steam coagulate water and enter cooling tower 2, is cooled to enter circulating water pool 4 again about 30 ℃, as the additional water source of circulating water pool internal cooling water.
Embodiment
Mixed steam about 90 ℃ coagulates water and enters plate-type heat exchanger 1, and temperature reduces after the heat exchange, enters cooling tower 2 then and continues cooling, is cooled to enter circulating water pool 4 about 30 ℃, as the additional water source of circulating water pool internal cooling water; Enter circulating water pool 4 from condenser 3 effusive secondary juice vapour water of condensation with water coolant, add liming or milk of lime, make it arrive neutral (between the about 7-7.5 of PH), enter cooling tower 2 then and be cooled to enter circulating water pool 4 about 30 ℃, recycle; Part is removed suspended substance, microorganism, colloid through ultrafiltration system 5, enter then interchanger 1 be warming up to send about 65 ℃ the squeezing as the squeezing infiltration water, the part can be used as other process waters, draw circulating water pool 4, promote rotating of recirculated cooling water with this, improve the water quality in the circulating water pool.Most of recirculated cooling water recycles in system again, if the water yield reduces in the circulating water pool 4, can strengthen the magnitude of recruitment that mixed steam coagulates water.
Mixed steam about 90 ℃ coagulates water and enters spiral-plate exchanger 1, and temperature reduces after the heat exchange, enters cooling tower 2 then and continues cooling, is cooled to enter circulating water pool 4 about 30 ℃, as the additional water source of circulating water pool internal cooling water; Enter circulating water pool 4 from condenser 3 effusive secondary juice vapour water of condensation with water coolant, add milk of lime or liming, make it arrive neutral (between the about 7-7.5 of PH), enter cooling tower 2 then and be cooled to enter circulating water pool 4 about 30 ℃, recycle; Part is through ultrafiltration system 5, remove suspended substance, microorganism, colloid, enter then spiral heat exchanger 1 be warming up to send about 65 ℃ the squeezing as the squeezing infiltration water, part can be used as other process waters, draw circulating water pool 4, promote rotating of recirculated cooling water, improve the water quality in the circulating water pool with this.Most of recirculated cooling water recycles in system again, if the water yield reduces in the circulating water pool 4, can strengthen the magnitude of recruitment that mixed steam coagulates water.
Enter circulating water pool 4 from condenser 3 effusive secondary juice vapour water of condensation with water coolant, add milk of lime or liming, make it arrive neutral (between the about 7-7.5 of PH), enter cooling tower 2 then and be cooled to enter circulating water pool 4 about 30 ℃, recycle; Part enters boiler water film dedusting and Ash Removal System 6 through round-robin water coolant repeatedly, through the high temperature killing microorganisms, utilize cindery adsorption to remove part colloid and sugar part, again through detritus pool 7 and filtering system 8, remove suspended substance and lime-ash, enter cooling tower 2 then and be cooled to about 30 ℃, the covering recirculated cooling water; The part recirculated cooling water also can be used as other purposes, draws circulating water pool 4, promotes rotating of recirculated cooling water with this, improves the water quality in the circulating water pool.Most of recirculated cooling water uses at system's internal recycle, if the water yield reduces in the circulating water pool 4, can make mixed steam coagulate water and enter cooling tower 2, is cooled to enter circulating water pool 4 again about 30 ℃, as the additional water source of circulating water pool internal cooling water.
Embodiment 4
Mixed steam about 90 ℃ coagulates water and enters shell and tube heat exchanger 1, and temperature reduces after the heat exchange, enters cooling tower 2 then and continues cooling, is cooled to enter circulating water pool 4 about 30 ℃, as the additional water source of circulating water pool internal cooling water; Enter circulating water pool 4 from condenser 3 effusive secondary juice vapour water of condensation with water coolant, add liming, perhaps sodium hydroxide, make it arrive neutral (between the about 7-7.5 of PH), entering cooling tower 2 then is cooled to about 30 ℃, part is through ultrafiltration system 5, remove suspended substance, microorganism, colloid, enter then shell and tube heat exchanger 1 be warming up to send about 65 ℃ the squeezing as the squeezing infiltration water, the part can be used as other process waters, draw circulating water pool 4, promote rotating of recirculated cooling water with this, improve the water quality in the circulating water pool.Most of recirculated cooling water recycles in system again, if the water yield reduces in the circulating water pool 4, can strengthen the magnitude of recruitment that mixed steam coagulates water.
Enter circulating water pool 4 from condenser 3 effusive secondary juice vapour water of condensation with water coolant, add sodium hydroxide and make it arrive neutral (between the about 7-7.5 of PH), enter cooling tower 2 then and be cooled to enter circulating water pool 4 about 30 ℃, recycle; Part enters boiler water film dedusting and Ash Removal System 6 through round-robin water coolant repeatedly, through the high temperature killing microorganisms, utilize cindery adsorption to remove part colloid and sugar part, again through detritus pool 7 and filtering system 8, remove suspended substance and lime-ash, enter cooling tower 2 then and be cooled to about 30 ℃, the covering recirculated cooling water; The part recirculated cooling water also can be used as other purposes, draws circulating water pool 4, promotes rotating of recirculated cooling water with this, improves the water quality in the circulating water pool.Most of recirculated cooling water uses at system's internal recycle, if the water yield reduces in the circulating water pool 4, can make mixed steam coagulate water and enter cooling tower 2, is cooled to enter circulating water pool 4 again about 30 ℃, as the additional water source of circulating water pool internal cooling water.
Claims (5)
1. novel technique for quality-preservation treatment of sugar plant circulation cooling water, it is characterized in that: this technological process comprises the steps:
(1) regulates the pH value of recirculated cooling water to neutral with alkaline material;
(2) circulating water pool internal recycle water by turns improves the water quality in the circulating water pool, after the recirculated cooling water sugar-containing concentration is higher than juice vapour water of condensation sugar-containing concentration, takes out and use the part recirculated cooling water, replenishes simultaneously to hang down to contain sugared clean vapour and coagulate water;
(3) mixed steam behind the part heat removal is water-cooled to about 30 ℃ with fixed attention replenishment cycles pond internal recycle water;
(4) will part repeatedly the round-robin water coolant after ultrafiltration membrane system is filtered, remove suspended substance, microorganism, colloid is warming up to by interchanger then and send squeezing as the squeezing infiltration water about 65 ℃; Perhaps will part repeatedly the round-robin water coolant send boiler as towards buck, through the high temperature killing microorganisms, utilize cindery adsorption to remove part colloid and sugar part, again through sedimentation, filtration, the covering recirculated cooling water; Also get the part recirculated cooling water simultaneously as other water, promote rotating of recirculated cooling water with this.
2. novel technique for quality-preservation treatment of sugar plant circulation cooling water according to claim 1 is characterized in that: the alkaline material of regulating recirculated water is milk of lime, liming, sodium hydroxide or ash-flushing water.
3. novel technique for quality-preservation treatment of sugar plant circulation cooling water according to claim 1 is characterized in that: it can be plate-type heat exchanger, spiral-plate exchanger or shell and tube heat exchanger with the interchanger that the squeezing infiltration water carries out thermal exchange that mixed steam coagulates water.
4. the equipment that novel technique for quality-preservation treatment of sugar plant circulation cooling water according to claim 1 adopted, it is characterized in that: this equipment comprises circulating water pool (4), cooling tower (2), condenser (3), ultrafiltration system (5) and interchanger (1), wherein circulating water pool (4) is received in cooling tower (2), condenser 3 outlets, circulating water pool (4) outlet connects ultrafiltration system (5), ultrafiltration system (5) connects interchanger (1), and heat exchanger exit connects cooling tower (2).
5. the equipment that novel technique for quality-preservation treatment of sugar plant circulation cooling water according to claim 1 adopted, it is characterized in that: this equipment comprises circulating water pool (4), cooling tower (2), condenser (3), boiler water film dedusting and Ash Removal System (6), detritus pool (7) and filtering system (8), cooling tower (2) wherein, circulating water pool (4) is received in condenser (3) outlet, circulating water pool (4) outlet connects boiler water film dedusting and Ash Removal System (6), boiler water film dedusting and Ash Removal System (6) connect detritus pool (7), and detritus pool (7) connects cooling tower (2) and circulating water pool (4) after taking over filtering system (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100663851A CN100548909C (en) | 2007-11-19 | 2007-11-19 | Sugar plant circulation cooling water guarantee the quality treatment process and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100663851A CN100548909C (en) | 2007-11-19 | 2007-11-19 | Sugar plant circulation cooling water guarantee the quality treatment process and equipment |
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| Publication Number | Publication Date |
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| CN101182088A true CN101182088A (en) | 2008-05-21 |
| CN100548909C CN100548909C (en) | 2009-10-14 |
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| CNB2007100663851A Expired - Fee Related CN100548909C (en) | 2007-11-19 | 2007-11-19 | Sugar plant circulation cooling water guarantee the quality treatment process and equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798148A (en) * | 2010-03-26 | 2010-08-11 | 广西大学 | Method for producing drinking water by utilizing steam condensation water of sugar refinery |
| CN102765836A (en) * | 2012-08-17 | 2012-11-07 | 国家海洋局天津海水淡化与综合利用研究所 | Seawater circulating cooling system based on forward osmosis moisturizing technique |
| CN103988902A (en) * | 2014-05-29 | 2014-08-20 | 吴忠市物华乳品饮料有限公司 | Milk beverage production process for recycling cooling water |
| CN108609790A (en) * | 2018-05-07 | 2018-10-02 | 山东焦点生物科技股份有限公司 | A kind of water circulation system of Sodium Hyaluronate clean manufacturing |
| CN115752076A (en) * | 2022-10-27 | 2023-03-07 | 成都飞创科技有限公司 | Control method of cooling circulating water system |
-
2007
- 2007-11-19 CN CNB2007100663851A patent/CN100548909C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798148A (en) * | 2010-03-26 | 2010-08-11 | 广西大学 | Method for producing drinking water by utilizing steam condensation water of sugar refinery |
| CN102765836A (en) * | 2012-08-17 | 2012-11-07 | 国家海洋局天津海水淡化与综合利用研究所 | Seawater circulating cooling system based on forward osmosis moisturizing technique |
| CN102765836B (en) * | 2012-08-17 | 2014-04-09 | 国家海洋局天津海水淡化与综合利用研究所 | Seawater circulating cooling system based on forward osmosis moisturizing technique |
| CN103988902A (en) * | 2014-05-29 | 2014-08-20 | 吴忠市物华乳品饮料有限公司 | Milk beverage production process for recycling cooling water |
| CN103988902B (en) * | 2014-05-29 | 2015-11-18 | 吴忠市物华乳品饮料有限公司 | The milk beverage production technology of cooling water cycling and reutilization |
| CN108609790A (en) * | 2018-05-07 | 2018-10-02 | 山东焦点生物科技股份有限公司 | A kind of water circulation system of Sodium Hyaluronate clean manufacturing |
| CN115752076A (en) * | 2022-10-27 | 2023-03-07 | 成都飞创科技有限公司 | Control method of cooling circulating water system |
| CN115752076B (en) * | 2022-10-27 | 2023-12-01 | 成都飞创科技有限公司 | Control method of cooling circulating water system |
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|---|---|
| CN100548909C (en) | 2009-10-14 |
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