CN1206170C - Process for treating cyclic cooling water - Google Patents
Process for treating cyclic cooling water Download PDFInfo
- Publication number
- CN1206170C CN1206170C CN 02109415 CN02109415A CN1206170C CN 1206170 C CN1206170 C CN 1206170C CN 02109415 CN02109415 CN 02109415 CN 02109415 A CN02109415 A CN 02109415A CN 1206170 C CN1206170 C CN 1206170C
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- water
- cooling water
- reverse osmosis
- treatment process
- recirculated cooling
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Abstract
The present invention relates to a method for treating cyclic cooling water, which belongs to the technical field of industrial water saving. In the prior art, a method capable of being used for deeply treating cyclic cooling water has poor economy. In the present invention, a fiber filtering device and a low-pressure reverse osmosis treating device are additionally arranged behind a side filtering line in a cyclic cooling water system with a low concentration multiple, the quantity of lead-out water is from 0.2% to 2.0% of the quantity of cyclic water, the coarse filtration and the fiber filtration are carried out to the lead-out water, and the reverse osmosis treatment is carried out to the filtered effluent water; the discharge quantity of a concentrated solution is from 15% to 25% of the treatment quantity, a penetrating solution returns the cooling water system in a cyclic mode, and the concentrated solution is discharged. The method has the advantages of good economy, water saving and less cost increase, and the method can be used for the cyclic cooling water system with the low concentration multiple.
Description
Technical field
The present invention relates to a kind of treatment process of recirculated cooling water, relate in particular to a kind of method that reduces the recirculating cooling water system amount of makeup water, especially for the method that in the lower recirculating cooling water system of cycles of concentration, reduces amount of makeup water.The invention belongs to industrial water-saving technology field.
Background technology
The unenclosed constructions of the most employing of China's recirculating cooling water system at present, recirculated cooling water is in recycling process, enter in the recirculating cooling water system because of the contained a large amount of pollutents such as dust of air on the one hand, dissolved oxygen concentration in the recirculated water is raise, suspended substance gathers and cause the procreation of microorganism to grow, and causes biological clay harm; Make refrigeration cycle each time that the water yield is decreased because of reasons such as vaporization losses, air-cooled tower windage loss on the other hand.Therefore, in the recirculating cooling water system working cycle, need a large amount of make up water of continuous supplementation (generally selecting fresh surface water or underground water for use), a part is replenished as recycle system vaporization losses, air-cooled tower windage loss water, and another part is as ensureing recycle system circulation cooling water quality stabilizing, avoiding need being replenished by the water yield of recycle system blowdown because of water quality deterioration causes fouling of cold exchange device burn into and rate of heat exchange to descend.In this two portions make up water, generally be constant as the magnitude of recruitment of recycle system vaporization losses, air-cooled tower windage loss water, depend primarily on the temperature of environment and the form of air-cooled tower; Second section then is subjected to circulating water quality and to the influence of circulating water treatment technology as ensureing that recycle system circulation cooling water quality stabilizing need be replenished by the water yield of recycle system blowdown, the treatment measures of taking as the source of the content of concentration, bacterium and the microorganism of suspended substance in the recirculated cooling water, total solids level, make up water and water quality, to circulating cooling water quality etc.Based on foregoing a variety of causes, according to traditional idea and understanding, present Water Treatment in Circulating Cooling System mainly adopts chemical agents such as adding various types of Scale inhibitorss, inhibiter, sterilant in the recycle system, and small part water is made by-passing filter remove measures such as suspended substance processing.There is following problem in this processing scheme, singly deposit when using chemical agent because between the diversity of the complicacy of water quality, chemical agent, medicament and unavoidably bad chemical reaction can take place between medicament and the recirculated water, and chemical agent must regularly quantitatively add, grasp the improper deterioration that can accelerate water quality on the contrary, produce opposite effect, the chemical agent that is added simultaneously just became new pollutent after losing efficacy, the solids content in the recirculated water can not be reduced simultaneously, still processing need be partly effluxed generally speaking; Singly deposit small part water in the circulating water system is done the measure that by-passing filter removes the suspended substance processing, can only alleviate or part solves the biological clay problem that suspended substance brought in the recirculated water, and reach certain treatment effect, need the low-down cycles of concentration of control; Both are used in combination, part by-passing filter when adding chemical agent, controlling low-down cycles of concentration (as below 2.0) but also have only, could effectively keep the normal operation of recirculating cooling water system, because adopt lower cycles of concentration, system need discharge a large amount of sewage, need in the recycle system, to replenish a large amount of fresh waters simultaneously, this not only causes waste, the increase quantity of wastewater effluent of great lot of water resources, and has increased production cost.
For the circulating water quality that improves recirculating cooling water system, the cycles of concentration that improves circulating water system, reduction system's amount of makeup water and system's blowdown flow rate, carried out technical study widely at present both at home and abroad, and focus mostly in exploitation, as various organophosphates, energy and Ca to the chemical agent of circulating water treatment
2+, Mg
2+The chelating poly-phosphate of complexing etc., recirculated cooling water for a certain specific water quality, select suitable chemical agent to handle to play really the effect of stable circulation water water quality, anticorrosion, antiscale, kill microorganisms, but in, but owing to the characteristics of this method have determined still problem recited above can occur to the recirculated cooling water treating processes.US6086772 (EP0893412) discloses a kind of method of preventing the biological pollution of cooling water system recirculated water, in cooling water recirculation system, place ozonizer, produce ozone with high concentration by ozonizer, replace sterilant such as chlorine etc., finish the germicidal action of and microbial contamination biological to recirculated water in the recirculating cooling water system, but this method has only been improved in the circulating water quality problem because of biological pollution brought, the problem that the circulating water quality that causes because of suspended substance and total solids etc. in the recirculated water worsens is not had an effect substantially, can not fundamentally improve the amount of makeup water of the cycles of concentration and the reduction cooling circulating water system of circulating cooling system.Chinese patent ZL93108366.4,93218891 and 94202193 discloses a kind of treatment process and device that is used for the air-conditioning system water coolant, this method and device are that the strainer that a kind of function carbon fiber processing material is a main body is fixed in the recirculated cooling water flow process of air-conditioning system, allow water naturally by this filter plant, because this material has the electromotive force that can reduce water, the dissolved oxygen in the consume water, the Ca in the planar water
2+, Mg
2+Effect Deng pollutent, thereby recirculated water has been played the effect of anticorrosion, antiscale, supression microbial proliferation growth, have the efficient height, use manpower and material resources sparingly, keep the stable effect of circulating water quality than the chemical method processing, yet this method is in implementation process, for the open type circulating cooling system, handle material usage and require to be the 0.033-0.050% (weight) of the global cycle water yield, if be used for quantity of circulating water several ten thousand m
3In the large-scale water circulation system more than the/h, the one-time pad amount of this material will reach several tons, because carbon fibre material is very light, cost an arm and a leg, therefore install one-time investment and floor space is very big, and the saturated regeneration of this material needs to consume a large amount of clear water again, produces a large amount of sewers, uses in extensive Water Treatment in Circulating Cooling System to be difficult to realize.
Summary of the invention
The main economy problems that exists of recirculated cooling water treatment technology in the prior art the object of the present invention is to provide a kind of treatment process of investing low, recirculated water recovery utilization rate height, reduction recirculated cooling water amount of makeup water that floor space is little.
The present patent application people is through studying discovery for a long period of time, because of causing the recirculated water total solids level, vaporization losses and air-cooled tower windage loss constantly concentrate in the recirculating cooling water system, particularly the thickening problem of soluble solids and small free microorganism is the important factor that restriction circular water treating system cycles of concentration improves, can play anti-scaling action though add chemical agent, but certain limit is arranged, general filtration can only have effect preferably to suspended substance, but it is powerless for soluble solids and little water free microorganism, therefore only efflux some amount or, just can keep normal operation operating than hanging down under the cycles of concentration.For reducing solids content in the circulating water system, general exercisable scheme is the extremely low fresh supplemented water of employing solids content, or removes solid in circulating water system, adopts the latter more reasonable economically.Concrete which kind of mode of employing and operational condition also are the important factors that influences investment cost and working cost, the applicant is through economic balance and be defined as " filtration+reverse osmosis is handled the less water deep purifying " repeatedly behind the experimental study is final plan, and concrete scheme is as follows:
Other filter outlet line is set in recirculating cooling water system, draw the 0.2%-2.0% that the water yield is a quantity of circulating water, drawing-off water carries out coarse filtration, fiber filter, filter water outlet and carry out reverse-osmosis treated, the concentrated solution output is the 15%-25% of treatment capacity, penetrating fluid loops back in the cooling water system, and concentrated solution is discharged and handled.
The inventive method adopts " coarse filtration+fiber filter+reverse osmosis " purification process technique, not only makes the cooling circulating water that should not carry out reverse-osmosis treated can carry out reverse-osmosis treated, and the reverse osmosis membrane pollution is light, but the longer cycle running.In addition, handle owing to only other drainage in the recirculating cooling water system being carried out deep purifying, handling total amount is the 0.2%-2.0% of recirculating cooling water system recirculated water total amount only, makes the water yield that need handle less, reverse osmosis pressure is low, needed treatment facility investment and working cost are lower, and floor space is few, not chemical agent consumption, water reclamation rate height, quantity of wastewater effluent is few, has advantages of high practicability and unusual ideal economy, has good benefits in environment and social benefit simultaneously.According to preliminary reckoning, the cycles of concentration of recirculating cooling water system is brought up to 3.0 and 4.0 by 2.0, the amount of makeup water that is used for system is with corresponding reduction by 25% and 33%.
Description of drawings
Fig. 1 is a recirculated cooling water treatment scheme synoptic diagram of the present invention, and the small part recirculated cooling water is carried out advanced treatment, can reach aim of stable operation.
Embodiment
Further specify the solution of the present invention and effect below in conjunction with accompanying drawing.
In the recirculating cooling water system of Fig. 1, systemic circulation water coolant 1 decreases quantity of circulating water and is concentrated because of vaporization losses, air-cooled tower windage loss 2 and is recirculated water 3, recirculated water 3 small parts enter other filter line through coarse filtration facility 4 and fabric filter 5 filtration treatment, enter the 0.5%-2.0% that the water yield of handling in other filter tank is preferably recirculated water 3 water yields.The coarse filtration facility can be removed wherein silt and part suspended substance for for clarification, sand filtration etc.Fiberfill fibers bundle or fibre-ball filtration medium in the fabric filter 5, suspended substance in the recirculated water that filter is handled by making more than 95% and microorganism are held back by fiber medium and adsorb, trapped fluid is with pressurized air and filter water outlet backwash and regeneration, trapped fluid and regenerated liquid 8 and coarse filtration relief liquor 7 discharge systems.Water outlet after fabric filter 5 filters enters reverse osmosis unit 6 and makes the desalination purifying treatment, the concentrated solution 9 of reverse osmosis unit 6 is discharged circulating water system, output is preferably the 20%-25% of reverse osmosis unit flooding quantity, and reverse osmosis unit infiltration is purified waste water and is back to recirculating cooling water system after recycle system make up water 10 is mixed.
Filtration medium in the fabric filter 5 can adopt all kinds of fibrous bundles or fibrous nodules, and the filtration linear velocity is 10-25mh
-1When reaching saturated need the regeneration of filtration to fiber medium, air and filtration water outlet with 0.3-0.5MPa are regenerated to strainer, the fiber medium performance is replied, fiber medium trapped fluid and regenerated liquid are discharged recirculating cooling water system as sewage, its discharge total amount by the 2%-5% of processing quantity of circulating water.Reverse osmosis unit 6 can adopt rolled membrane module, plate type membrane component or tubular membrane component, but preferably select rolled membrane module for use, mould material can be selected a kind of in the materials such as cellulose acetate, many cellulose acetates, polymeric amide, polysulfone composite membrane for use, and the infiltration water flux is 10-40Lh
-1m
-2, average ratio of desalinization is 90%-95%, and control concentrated solution output is 15%-25% in the operating process, and concentrated solution is directly discharged recirculating cooling water system as sewage, and working pressure is generally about 2.0MPa.The amount of makeup water of recirculating cooling water system make up water 10 is replenished according to the water yield summation of the treatment unit draining 7,8,9 of the vaporization losses in the working cycle, air-cooled tower windage loss and other filter line.
The present invention handles by the other deep purifying of filtering line small part recirculated water to existing recirculating cooling water system, improved the water quality of full cycle water system, make cycles of concentration control lower in the present recirculating cooling water system bring up to higher level, as can reach more than 3.0, reduced amount of makeup water and system's blowdown flow rate of circulating water system significantly.
The inventive method is applicable to the processing of recirculated cooling water in the factory, and to hang down in the recirculating cooling water system of cycles of concentration operation, only needing to increase simple equipment can realize, reaches the purpose of reduction system amount of makeup water and blowdown flow rate especially at present.
Embodiment 1:
At home in certain factory of petrochemical refining recirculating cooling water system, recirculated water total amount 20858m
3h
-1, recycle system vaporization losses 188m
3h
-1, air-cooled tower windage loss 22m
3h
-1, the blowdown flow rate 223m of system
3h
-1, the circulation cycles of concentration is 1.77, with the make up water of surface water as recirculating cooling water system, amount of makeup water is 433m
3h
-1The main water quality of recirculated water is: the hard 102mgL of calcium
-1, basicity 115mgL
-1, turbidity 15mgL
-1, electricity is led 1590mgL
-1, Cl
-150mgL
-1, pH8.2.
Adopt the present invention to circulating cooling system other filter tank water outlet carrying out fiber filter and low pressure reverse osmosis processing, the processing water yield is 206m
3h
-1, filling fiber bundle in the fabric filter, control line filter depth 15mh
-1, the fibrous bundle in the strainer is regenerated the trapped fluid of discharge and backwash water water yield average out to 10m with air and the filtration water outlet of 0.5MPa
3h
-1, the low pressure reverse osmosis device adopts the cellulose acetate membrane module, and the penetrating fluid flow velocity is 20Lh
-1m
-2, working pressure is 2.0MPa, control concentrated solution output is 49m
3h
-1, purifying waste water after the processing is 149m
3h
-1With 269m
3h
-1Surface water system make up water mix and be back in the circulating water system.
The circulating water quality of the whole circulation system that obtains after method of the present invention is handled is: the hard 101.7mgL of calcium
-1, basicity 114.9mgL
-1, turbidity 14.6mgL
-1, electricity is led 1576.8mgL
-1, Cl
-146mgL
-1, pH8.2 satisfies the water quality requirement of recirculated water fully.The amount of makeup water 269m of system
3h
-1, the blowdown flow rate 59m of system
3h
-1, system's cycles of concentration brings up to 3.32.Compare with existing recirculating cooling water system, the recirculated water magnitude of recruitment has reduced by 38%, and system's blowdown has reduced by 73.5%, and circulating water quality is constant substantially.
Embodiment 2:
At home in certain factory of petrochemical refining recirculating cooling water system, recirculated water total amount 42800m
3h
-1, recycle system vaporization losses 652m
3h
-1, air-cooled tower windage loss 40m
3h
-1, the blowdown flow rate 504m of system
3h
-1, Control Circulation cycles of concentration 2.2, with the make up water of surface water as recirculating cooling water system, amount of makeup water is 1196m
3h
-1, the main water quality of recirculated water is: the hard 60.3mgL of calcium
-1, basicity 58.8mgL
-1, turbidity 13mgL
-1, electricity is led 386mgL
-1, Cl
-55mgL
-1, pH7.99.
Adopt the present invention to circulating cooling system other filter tank water outlet carrying out fiber filter and low pressure reverse osmosis processing, the processing water yield is 422m
3h
-1, filling fiber bundle in the fabric filter, control line filter depth 18mh
-1, with air and the filtration water outlet of 0.5MPa the fibrous bundle in the strainer to be regenerated, the trapped fluid of discharge and the backwash water water yield are 21m
3h
-1, reverse osmosis unit adopts the cellulose acetate membrane module, and the penetrating fluid flow velocity is 25Lh
-1m
-2, working pressure is 2.0MPa, control concentrated solution output is 80m
3h
-1, purifying waste water after the processing is 321m
3h
-1With 793m
3h
-1Surface water system make up water mix and be back in the circulating water system.
The circulating water quality of the whole circulation system that obtains after method of the present invention is handled is: the hard 59.9mgL of calcium
-1, basicity 58.5mgL
-1, turbidity 11.6mgL
-1, electricity is led 383.3mgL
-1, Cl
-46mgL
-1, pH8.0 satisfies the water quality requirement of recirculated water fully.The amount of makeup water 793m of system
3h
-1, the blowdown flow rate 101m of system
3h
-1, system's cycles of concentration brings up to 5.5.Compare with existing recirculating cooling water system, the recirculated water magnitude of recruitment has reduced by 33.7%, and system's blowdown flow rate has reduced by 80.0%, and circulating water quality is constant substantially.
Claims (7)
1, a kind of treatment process of recirculated cooling water, the bypass decontamination line that comprises coarse filtration is set in recirculating cooling water system, it is characterized in that after coarse filtration, being provided with fiber filter and reverse-osmosis treated, its treatment capacity is the 0.2%-2.0% of quantity of circulating water, reverse osmosis water outlet and make up water are got back to circulating water system, the reverse osmosis concentrated liquid discharging.
2,, it is characterized in that described fiber filter media is fibrous bundle or fibrous nodules according to the treatment process of the described recirculated cooling water of claim 1.
3,, it is characterized in that a kind of for from materials such as cellulose acetate, many cellulose acetates, polymeric amide, polysulfone composite membrane of reverse osmosis membrane that described reverse osmosis adopts according to the treatment process of the described recirculated cooling water of claim 1.
4,, it is characterized in that described reverse osmosis employing rolled membrane module, plate type membrane component or tubular membrane component according to the treatment process of claim 1 or 3 described recirculated cooling waters.
5, according to the treatment process of the described recirculated cooling water of claim 3, the infiltration water flux that it is characterized in that described reverse osmosis membrane is 10～40Lh
-1m
-2
6,, it is characterized in that control concentrated solution output is the 15%-25% of treatment capacity in the described reverse osmosis process according to the treatment process of the described recirculated cooling water of claim 1.
7,, it is characterized in that described fiber filter adopts pressurized air and filters out water reuse, the regenerated liquid discharging according to the treatment process of claim 1 or 2 described recirculated cooling waters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02109415 CN1206170C (en) | 2002-04-04 | 2002-04-04 | Process for treating cyclic cooling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02109415 CN1206170C (en) | 2002-04-04 | 2002-04-04 | Process for treating cyclic cooling water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448342A CN1448342A (en) | 2003-10-15 |
| CN1206170C true CN1206170C (en) | 2005-06-15 |
Family
ID=28680418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02109415 Expired - Lifetime CN1206170C (en) | 2002-04-04 | 2002-04-04 | Process for treating cyclic cooling water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1206170C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501300C (en) * | 2007-03-26 | 2009-06-17 | 任广兴 | Open industrial circulating-cooling water concentrating ratio and drug concentration balance control method |
| CN101279780B (en) * | 2008-05-20 | 2010-06-02 | 钮德明 | Method for removing sugar of and purifying boiler water for sugar refinery |
| CN101822922A (en) * | 2009-03-06 | 2010-09-08 | 北京科净源科技股份有限公司 | Cooling circulating water double pollution discharge treatment method |
| CN203144231U (en) * | 2013-03-22 | 2013-08-21 | 宁波全泽国际贸易有限公司苏州分公司 | Water treatment device for cooling water tower |
| CN104058543A (en) * | 2013-03-22 | 2014-09-24 | 苏州鑫泽雅节能设备有限公司 | Water treatment device for water cooling tower |
| CN106927591A (en) * | 2017-04-19 | 2017-07-07 | 洁禹通（青岛）环保科技有限责任公司 | Level pressure mends desalted water and degassing unit |
| CN108314225A (en) * | 2018-01-26 | 2018-07-24 | 浙江理工大学 | Improve the device and purification method of sewage stripping bottom of tower reuse purified water water quality |
| CN110436687A (en) * | 2018-05-04 | 2019-11-12 | 芜湖佳泽利环境资源科技有限公司北京分公司 | A kind of Zero discharging system and method for suitable industrial circulating water |
| CN112194298B (en) * | 2020-08-07 | 2022-11-01 | 东方电气集团东方锅炉股份有限公司 | System and method for recycling wastewater of whole power plant |
-
2002
- 2002-04-04 CN CN 02109415 patent/CN1206170C/en not_active Expired - Lifetime
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