CN1295157C - Heat-engine plant circulating water classified concentration series using process - Google Patents
Heat-engine plant circulating water classified concentration series using process Download PDFInfo
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- CN1295157C CN1295157C CN 02120890 CN02120890A CN1295157C CN 1295157 C CN1295157 C CN 1295157C CN 02120890 CN02120890 CN 02120890 CN 02120890 A CN02120890 A CN 02120890A CN 1295157 C CN1295157 C CN 1295157C
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Abstract
The present invention discloses a classified concentrating and serial using technique for circulating water of a heat-engine plant. Circulating cooling water of a power plant is treated by two stages, feeding water is in serial operation, first-stage raw water enters a circulating cooling water system of a first-stage machine set to be in low-concentrated multiplying power operation after being used by an industrial water system, and the concentrated multiplying power is not less than 2; first-stage circulating sewerage is dealkalized and softened through weak-acidity ion-exchange resins to be used as circulating feeding water of a second-stage machine set, the circulating cooling system of the second-stage machine set adopts high-concentrated multiplying power operation, the concentrated multiplying power is not less than 45, and the total concentrated multiple of the circulating cooling water is not more than 60; the sewerage is used as raw water for the water feeding systems of the boilers or water for other subscribers. The classified concentrating and serial using technique can be used for furthest reducing wastewater quantity and environmental pollution so as to realize the zero discharge of the circulating cooling water of the power plant, and the classified concentrating and serial using technique has obvious economical and social benefit.
Description
Technical field
The present invention relates to a kind of heat-engine plant circulating water classification concentration series use technology, belong to the circulating cooling water of power plant processing technology field.
Background technology
In power industry, the fuel-burning power plant is the important component part of electrical production.To the end of the year 2000, China's generating total installation of generating capacity is 3.193 hundred million kilowatts, and wherein the thermoelectricity installed capacity is 2.375 hundred million kilowatts, and fossil capacity accounts for 74.4% of total volume.Thermal power plant's production characteristics, consume fuel and water resources only are example with the water, and a whole nation year total water consumption is 23.54 billion cubic meters, and it is 586 billion cubic meters that the fresh water amount is got in national thermal power generation, accounts for half of whole nation industry water intaking total amount, therefore becomes the water consumption rich and influential family.It is calculated that about 8.6 ten thousand tons/day of 1000MW large thermal power plant whole plant water loss, the water consumption of a suitable medium-sized city.In addition, the waste water of heat-engine plant discharging causes serious harm to environment, and is particularly seriously deficient in the northern area of China water resources, and the power plant effluent discharging also causes water environment pollution to restrict the Sustainable development of city and electric power.Given this, how to reduce thermal power plant's water consumption, improve water surrounding, realize the power plant effluent zero release, become the urgent problem that solves of insider.
The water consumption system with more is a cooling water system in the thermal power plant, recirculated cooling water blowdown loss occupies very big proportion, reducing the topmost technological approaches of this loss is the concentration rate that improves recirculating cooling water system, and the selection of concentration rate should meet safety, economical operation requirement.Disclosed scheme in the prior art, generally all adopt the single-stage concentration technique, and the circulation supplementary feed is in parallel the use, be that the water original place comes water or the water coolant after subsidiary engine uses directly to enter each unit cooling tower, supplementary feed adopts and simply adds aching and limpization processing or water stabilizer processing, thereby make concentration rate of circulating cooling water bring up to 3～4 times from 2, its water amount of blowdown is still bigger, and effect is unsatisfactory.
Summary of the invention
The object of the present invention is to provide a kind of heat-engine plant circulating water classification concentration series use technology.It can improve concentration rate of circulating cooling water, reduces wastewater flow rate, realizes water saving, thereby realizes the circulating water system zero release.
Design of the present invention is such, for realizing purpose of the present invention, it is that supplementary feed carries out classification and concentrates that the present invention comes water with waterhead area, series connection is used, being about to circulating cooling water of power plant is divided into two-stage and handles, the supplementary feed series operation, waterhead area come water just the former water of the first step after industrial water system uses, enter the low concentration rate operation of first step unit recirculating cooling water system, first step circulation sewer through the weak acid ion-exchange resin dealkalize is softening handle after as second stage unit circulation supplementary feed, the recirculating cooling water system of second stage unit adopts the high concentration ratio operation, and the total concentration rate of recirculated cooling water 〉=6.0, its sewer after clarification filtration and reverse osmosis membrane processing as the former water of power plant's pot compensating water system and other user's water.
Concrete, concentration rate≤2 of first step concentration systems recirculated cooling water among the present invention, concentration rate≤4.5 of second stage concentration systems recirculated cooling water.Technology of the present invention comprises the steps:
A, waterhead area come water (supplementary feed) to enter the low concentration rate of first step unit recirculating cooling water system≤2 operations after industrial water system uses;
B, through the sewage that the first step concentrate to be discharged, filter the weak acid ion exchange treatment;
In order to satisfy the influent quality of weak acid resin, before the weak acid resin interchanger, high-efficiency filtration systems is set, remove the suspended substance in the water into earlier, again through ion exchange resin dealkalize, the softening processing, utilize the weak acid ion-exchange resin exchange capacity big, regeneration easily, and also the low principle of acid consumption is removed carbonate hardness and basicity in the water, reduce the saltiness in the water, thereby reach the purpose that improves the recirculated water concentration rate.Used exchange membrane is generally the low pressure pollution resistant composite film.
The weak acid ion exchange treatment system fiber ball filter design separate unit 200m that exerts oneself among the present invention
3/ h, water inlet suspension content 60～100mg/L, water outlet suspension content≤5mmol/L, double-current technology is adopted in weak acid ion-exchange, the separate unit 280～350m that exerts oneself
3/ h, the average basicity 0.5～0.7mmol/L of its water outlet, when go out alkalinity of water be influent alkalinity 60%～65% the time resin lost efficacy, need regeneration.
C, circulation supplementary feed enter second stage unit circulating cooling system, concentration rate≤4.5, and the total concentration rate of recirculated cooling water 〉=6.0.
D, the second stage concentrate the clarifying contaminated liquids filtration treatment of discharging, and this operation also is the processing of giving of reverse osmosis membrane processing.
E, reverse osmosis membrane processing.
This operation is utilized semi-permeable membranes desalination principle, remove the salt in the water, can obtain the fresh water of low saline salinity, be used for the former water of boiler of power plant supplementary feed treatment system or supply other fresh water user, in power plant, reuse, thereby reach water saving and prevent the purpose that waste water effluxes.
Reverse osmosis membrane processing system system current journey is provided in detail by this Figure of description 2.
Among the present invention, reverse osmosis treatment system design maximum processing capability 240m
3/ h.Be provided with an accelerator, two valveless filtering pools, 5 double filtering strainers, 5 activated charcoal filters and 3 cover reverse osmosiss (adopting U.S. Hai Deneng company to produce the low composite membrane LFCI that pollutes) desalting plant in the system.Native system design controlling index is: accelerator water outlet suspension content≤10mg/L, go out the water hardness and be 10%～20% of water inlet hardness, the water outlet total silicon for the water inlet total silicon～30%, outlet water organic substance (COD) be entering organic matter of water～50%, water outlet pH value～10.8; Valveless filtering pool water outlet suspension content≤10mg/L, filtered water tank water inlet (the filter tank water outlet adds the acid back) pH value 7.5～8.5; The double filtering filter backwash cycle is definite through debugging according to Inlet and outlet water pressure reduction, and SDI≤4 are from water consumption≤5%; The activated charcoal filter backwash cycle is definite through debugging according to practical operation situation, SDI≤4, and COD (Mn)≤2mg/L is from water consumption≤5%, Reverse Osmosis Desalination Process Equipment system ratio of desalinization 〉=95%, system recoveries rate 75%.
The obtained positively effect of the present invention is:
Use technology of the present invention, do not increasing under the condition of cost, concentration rate of circulating cooling water is brought up to more than 6 times, water saving is more than 40%, reduce wastewater flow rate to greatest extent, thermal power plant's water amount of blowdown of million kilowatt can drop to below 200 tons, handles by clarification filtration and reverse osmosis desalination, thereby can reach the wastewater zero discharge requirement of circulating cooling water of power plant system.
The present invention takes into account and has considered draining in other waste water of power plant such as sanitary sewage, acidic and alkaline waste water, facility floor wash-down water, miscellaneous water, boiler chemical rinsing waste water, cooling tower maintenance waste water and the Waste Water Treatment, and all includes treatment system of the present invention in.
Technology of the present invention, the difference of the visual waterhead area water quality of its concrete processing condition and the composition difference of sewer adjust accordingly.
Technology of the present invention goes for the circulating water treatment of other industry such as chemical industry, metallurgy industry equally, is not subjected to the restriction of the concrete processing condition of the present invention.
Description of drawings
What accompanying drawing 1 was represented is schema of the present invention.
What accompanying drawing 2 was represented is reverse osmosis membrane processing system system water schema.
What accompanying drawing 3 was represented is the schema of the embodiment of the invention.
Embodiment
Following examples are in order to explanation the present invention.
Present embodiment is concentrated with the classification of certain four unit recirculated cooling water of power plant, series connection is used and is example.
The schema of present embodiment is provided by accompanying drawing 3.
The embodiment explanation:
Four specified oeprations at full load of unit, reservoir comes water (waterhead area comes water) to enter the unit circulating water system 1, No. 2 after industrial system is used, 1, No. 2 unit recirculated waters adopt low concentration rate operation, concentration rate 1.76, its sewer after the weak acid ion exchange treatment as 3, No. 4 unit circulation supplementary feed, 3, the recirculated water of No. 4 units adopts the high concentration ratio operation, concentration rate 3.86, the total concentration rate 6.79 of recirculated water, its sewer after clarification filtration and reverse osmosis membrane processing as the Yuan Shui of Boiler water Feeding System system.
Unit among the embodiment is ton/hour.
Claims (2)
1, a kind of heat-engine plant circulating water classification concentration series use technology, it is characterized in that waterhead area comes water to enter first step unit recirculating cooling water system with concentration rate≤2 operations after industrial system is used, first step circulation sewer through the weak acid ion-exchange resin dealkalize is softening handle after as second stage unit circulation supplementary feed, the circulating water system of second stage unit adopts 2＜concentration rate≤4.5 operations, its sewer after clarification filtration and reverse osmosis membrane processing as the former water of boiler of power plant compensating water system and other user's water.
2, by the described heat-engine plant circulating water classification of claim 1 concentration series use technology, it is characterized in that the total concentration rate of recirculated water 〉=6.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02120890 CN1295157C (en) | 2002-06-07 | 2002-06-07 | Heat-engine plant circulating water classified concentration series using process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02120890 CN1295157C (en) | 2002-06-07 | 2002-06-07 | Heat-engine plant circulating water classified concentration series using process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1463926A CN1463926A (en) | 2003-12-31 |
| CN1295157C true CN1295157C (en) | 2007-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02120890 Expired - Fee Related CN1295157C (en) | 2002-06-07 | 2002-06-07 | Heat-engine plant circulating water classified concentration series using process |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355663C (en) * | 2006-02-20 | 2007-12-19 | 张贵祥 | Circulating utilization treatment technology for waste water of heat-engine plant |
| CN101311123B (en) * | 2007-05-24 | 2010-05-26 | 中国石油化工股份有限公司 | Recirculated cooling water system cascade use method |
| CN101738133B (en) * | 2008-11-20 | 2012-05-30 | 中国石油化工股份有限公司 | Optimized operation method of circulating cooling water system |
| CN101805081B (en) * | 2010-03-22 | 2011-11-23 | 山东电力工程咨询院有限公司 | Water treatment system of power plant for combining multi-path water into one path of water |
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2002
- 2002-06-07 CN CN 02120890 patent/CN1295157C/en not_active Expired - Fee Related
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