CN103058408A - Recovery treatment method and treatment recycling system of power generation industrial wastewater - Google Patents
Recovery treatment method and treatment recycling system of power generation industrial wastewater Download PDFInfo
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- CN103058408A CN103058408A CN2011103207274A CN201110320727A CN103058408A CN 103058408 A CN103058408 A CN 103058408A CN 2011103207274 A CN2011103207274 A CN 2011103207274A CN 201110320727 A CN201110320727 A CN 201110320727A CN 103058408 A CN103058408 A CN 103058408A
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Abstract
The invention relates to a recovery treatment method of power generation industrial wastewater. The method drainage produced in a power generation process is classifiedly recovered according to water quality and is used again after corresponding treatment, so that power generation industrial wastewater can be completely used reasonably and wastewater treatment cost is maximally reduced, and zero-release of the power generation industrial wastewater is realized in a true sense. The treatment recycling system of the power generation industrial wastewater combines conventional water treatment apparatuses according to the characteristic of water quality of process drainage, takes full use of existing water production apparatuses and filter-press apparatuses of a power generation factory, thereby forming a water treatment system suitable for treating the power generation industrial wastewater. The treatment recycling system is simple in apparatus constitution and low in total cost, has very low usage and maintenance cost, and is suitable for various types of thermal power generation industries.
Description
Technical field
The present invention relates to a kind of power generation industries waste water reclamation treatment process and process reclaiming system, particularly a kind of method and treatment system that realizes the intermediate water processing of power generation industries wastewater zero discharge.
Background technology
Water is a kind of non-renewable and limited resources.Along with the fast development of large industrial economy, the day by day exhausted and serious waste of water resources has become the common issue with that the whole world faces.How the fuel-burning power plant reduces unit generating water requirement as highly energy-consuming water industry, and the zero release that realizes trade effluent is one of major objective of enterprise's disposal of three wastes discharging always.Thermal power plant generally adopts the following practice to the processing of trade effluent at present: the first is that the consequence that causes thus is a large amount of wastes of water resources with Industrial Wastewater Treatment rear direct discharging up to standard; The second is that all generating Waste Water Centralized are reclaimed after the unified processing of sewage plant; But because the water body composition of the main discharge point of power plant is different, the mode of focusing on will increase the expense of wastewater treatment, and is unfavorable to the accounting cost control of enterprise.In the practice, it would be desirable repeating again to recycle after the factory effluent classification disposal, realize the zero release of trade effluent.
Summary of the invention
The present invention is directed to the deficiency that exists in the generation current industrial wastewater treatment technology, proposed the processing reclaiming system of a kind of power generation industries waste water reclamation treatment process and realization the method.
A kind of power generation industries waste water reclamation treatment process of the present invention, comprise that the draining that will produce in the electrification technique as well as takes different recovery approach to reclaim and process according to the water quality situation, qualified water recycling will be processed, described power generation industries waste water mainly is comprised of two class water, and first kind water is the polyhalide water of water manufacturing system and therrmodynamic system generation in service; Equations of The Second Kind water is the ultra that desulfurization dust-removing technique produces; It is characterized in that: softening and the flocculation sediment art breading through lime successively behind the first kind water centralized recovery, then reach the standard of natural water through the dilution neutralization, use as the circulating water system make up water, the sewer that described circulating water system produces is for greening, life and other flat water, remainder enter and return the industrial impounding reservoir use after sewage works is processed; Described Equations of The Second Kind water centralized recovery obtains clear water by filter-pressing process after flocculation sediment is processed, a clear water part that obtains through press filtration is as the desulphurization system process water, and a part is as the ash discharge system process water.
Described power generation industries waste water reclamation treatment process, it is characterized in that first kind water through lime in earlier stage softening and depositing technology process and obtain to add the pure water of producing through reverse osmosis in the high rigidity clear water, make the processing water of described first kind water reach the natural water standard and use as the circulating water system make up water.
A kind of power generation industries wastewater treatment and renovation system that realizes power generation industries waste water reclamation treatment process, be comprised of process drain categorised collection system and processing, reclaiming system, described process drain recovery system comprises the water collecting basin that is arranged at each process drain mouth and the waste water reclamation pond formation that links to each other by pipeline with water collecting basin; Described waste water reclamation pond comprises that first kind water waste water reclamation pond and Equations of The Second Kind water waste water reclamation pond form, and wherein first kind water waste water reclamation pond is decided the platoon sewage collecting basin and linked to each other with steam turbine apparatus cools wastewater collecting basin with Water Treatment wastewater collecting basin, boiler sampling water coolant wastewater collecting basin, boiler respectively; Equations of The Second Kind water waste water reclamation pond links to each other with ground flushing water water collecting basin with desulphurization system process drain wastewater collecting basin, component cooling water water collecting basin, water bath dust-removing overflow water water collecting basin for subsequent use respectively, and the sewage in described each water collecting basin is squeezed into corresponding waste water reclamation pond through the pump pressure mode; Described first kind waste water reclamation pond by the road successively with the softening treating pond of lime, flocculation sediment treating pond, and dilution neutralizing treatment pond link to each other; Described Equations of The Second Kind waste water reclamation pond links to each other with the waste water flocculating treating pond by the road, and the outlet pipeline in described flocculation treatment pond links to each other with plate type pressure filter through force (forcing) pump; The outlet pipeline in described dilution neutralizing treatment pond links to each other with the circulating water system water pipe through small pump; The water outlet of described plate type pressure filter links to each other with desulphurization system process water pipeline and ash discharge system water pipeline respectively by the road.
Power generation industries waste water reclamation treatment process of the present invention, with the draining that produces in the electrification technique as well as according to the recovery of classifying of water quality situation, and repeat after processing accordingly to recycle, the power generation industries waste water that makes had both obtained all rationally reuses, can reduce to greatest extent cost for wastewater treatment again.Realized power generation industries wastewater zero discharge truly.Power generation industries wastewater treatment and renovation of the present invention system, according to the process drain water quality characteristics conventional water treatment device is made up, and take full advantage of the existing water preparation process device in power station and filter-pressing device, make it to become the water treatment system that a cover is suitable for processing power generation industries waste water, equipment consists of simple, overall cost is low, and the operation and maintenance cost is also very low, is applicable to various types of thermal power generation corporations and uses.
Description of drawings
Fig. 1 is power generation industries wastewater treatment and renovation system flowchart of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
Power generation industries waste water reclamation treatment process of the present invention is divided into two classes with the electrification technique as well as draining by water quality characteristics, recycling behind the classification recycling disposal.First kind water is polyhalide water, mainly comprise: (this treatment process adopts reverse osmosis process to the Water Treatment process drain, the waste water of discharging is high hardness water), boiler sampling water coolant (water quality than natural water slightly well), boiler arrange surely, platoon process water (water quality does not contain hardness, is alkaline water), steam turbine apparatus cools draining (water quality is natural water).Above-mentioned process drain is recycled in the waste water reclamation pond by recovery pipe network unification separately, and realizes acid-base neutralisation reaction and the dilution process of nature in the pond.Equations of The Second Kind water is the ultra, comprises the draining that boiler desulfurization technique produces, water bath dust-removing technique overflow water for subsequent use, and ground flushing water etc., the characteristics of this part water are that pH value approaches neutrality, high turbidity and soot particle particle diameter are little, about 50 ~ 200um.
First kind waste water at first carries out the lime softening process after realizing the nature neutralization processes, and adds the white lime [Ca of purity more than 70% in water
2(OH)
2], the compound calcium carbonate [CaCO that calcium in the waste water, magnesium ion is transformed into be insoluble in water
3] and magnesium hydroxide [Mg(OH)
2], reach the purpose that basicity in the water and hardness all decrease.The softening treatment process of lime requires OH in the water
-Amount is in the scope of 0.1 ~ 0.4mmol/L, and water temperature is controlled 20 ~ 25 ℃ of scopes, and an amount of stirring and steam heating are conducive to improve the softening effect of lime.
The draining meeting of chemical technology pretreatment system contains the partial suspended colloidalmaterial, the impact that is subjected to lime quality purity in the softening processing links of lime also can generating portion suspended substance and colloidalmaterial, carries out the flocculation sediment processing so enter down one recycle-water pond through the water outlet that lime is softening after processing.What the volume of pond for recovering can not be done when considering the natural sedimentation mode is excessive, so flocculation agent has been taked compound prescription, belongs to high molecular polymer, such as commercially available polyacrylamide, is mixed with 10% left and right sides concentration during concrete operations, evenly adds by the dosage of 60PPm.
First kind waste water is through natural neutralization, lime clear water softening and the rear acquisition of coagulating sedimentation processing still contains higher hardness, do not increase again corresponding treatment unit among the present invention, but according to water quality dilution principle, utilized existing appliance arrangement in the chemical water preparation process, a part of pure water that reverse osmosis is produced directly adds in the waste water after the processing, thereby has obtained the waste water close to the natural water standard.
Above-mentioned waste water uses as the make up water of circulating water system with pump housing pressuring method, the corresponding usage quantity that reduces fresh water, the sewer that simultaneously circulating water system is produced is as greening and life wash water, other unit coal washing, flushing cinder water etc., and indigested sewer enters and returns industrial impounding reservoir after the sewage recycle bin focuses on and recycle.
Equations of The Second Kind water is the ultra, recovery method with first kind water is the same, at first all kinds of waste water unifications are concentrated to the waste water reclamation pond, consider the dust granules that contains in the draining of power plant desulfurization dust collecting process thin (50 ~ 200um), the board-like filter-pressing device of tradition can't obtain high-quality clear water, so before filter-pressing process, increased flocculation treatment process, pass through again the filter-pressing device press filtration after making dust-laden waste water form the floc sedimentation shape, filter cake after the press filtration falls outward, and the clear water that produces after the press filtration then reclaims and uses as desulfurization, the circulation of ash discharge process water.
Clear water after the press filtration is divided into two portions, a part is the desulphurization system process water, with pump housing pressuring method for thionizer spray irrigation water and lime white flow container mixing water, another part is the ash discharge system process water, mainly stirs ash hoist humidification water and ground flushing water etc. for grey storehouse.
Embodiment 3 * 6MW heat supply unit, the chemistry water preparation process adopts the reverse-osmosis treated technology, and exhaust steam in steam turbine adopts the cooling of wet type process of circulation cooling water, and source water is the blending water of surface water and groundwater, day industrial water consumption day produces about 1800 tons of wastewater flow rates about 2800 tons.Wherein: the Water Treatment process drain is 180 tons, goes out about water hardness 28mmol/L, and it is neutral that pH value is; Boiler sampling cooling draining is the mixture of natural water and sample water, and water displacement is 360 tons, goes out about water hardness 8.0mmol/L, and it is neutral that pH value is; The draining of steam turbine apparatus cools is 90 tons, adopts the natural water cooling, goes out about water hardness 8.5mmol/L; The draining of boiler process water is at 150 tons, and hardness 0mmol/L, PH are alkalescence; Wastewater Form Circulating Cooling Water goes out water hardness 25mmol/L about 800 tons; 150 tons of sulfur removal technology drainings are the ultra; The ash discharge system water is at 130 tons, without outer draining.
In above-mentioned process drain, chemical technology draining, boiler blowdown water, the draining of steam turbine apparatus cools and boiler sampling thief cooling draining collect in the pond for recovering jointly, are called first kind water aggregating apparatus; This part water at first passes through acid-base neutralisation reaction and the dilution process of nature in pond for recovering, make waste water PH about 8.0, hardness is about 17mmol/L, thereafter water hardness is about 17mmol/L after processing by the lime softening process, obtain clear water by flocculation sediment technique, flocculation agent (polyacrylamide) consumption 3 ㎎/L, the waste water hardness 12mmol/L after the processing, reverse osmosis water outlet hardness is 0, presses 30m
3The requirement of the average treatment water yield of/h and final outflow water hardness 8/mmol/L is evenly mixed the reverse osmose pure-water of 10% ratio and can be realized in the neutralization reaction pond.
First kind wastewater treatment equipment was processed 720 tons of waste water in average day, this part water uses as the circulating water system make up water, 700 tons of corresponding saving fresh water amount, and the technique sewer that the unit circulating water system produces is as greening, life flushing and other unit coal washing, flushing cinder water, remainder enter and return the industrial impounding reservoir recycle after group's sewage works focuses on, and have realized the zero release of chemical water manufacturing system and therrmodynamic system process water.
The ultra that Equations of The Second Kind water aggregating apparatus has mainly concentrated desulfurization dust-removing technique and other water to produce, day output is 260 tons, this part water is processed through flocculation (polyacrylamide) first, consumption 5 ㎎/L obtain clear water through plate type pressure filter behind the formation flocculent precipitate again, and filter cake directly effluxes, the clear water that produces is divided into two portions, a part is as the sulfur removal technology water, and another part so is cycled to repeat utilization as the ash discharge system water.The water yield that loses because of factors such as spontaneous evaporations is replenished in right amount by industrial fresh water, thereby realized the zero release of desulfurization dust-removing technique waste water, and has reached the good water-saving result that day reduces by 260 tons of fresh water amount.
Claims (3)
1. power generation industries waste water reclamation treatment process, comprise that the draining that will produce in the electrification technique as well as takes different recovery approach to reclaim and process according to the water quality situation, qualified water recycling will be processed, described power generation industries waste water mainly is comprised of two class water, and first kind water is the polyhalide water of water manufacturing system and therrmodynamic system generation in service; Equations of The Second Kind water is the ultra that desulfurization dust-removing technique produces; It is characterized in that: softening and the flocculation sediment art breading through lime successively behind the first kind water centralized recovery, then reach the standard of natural water through the dilution neutralization, use as the circulating water system make up water, the sewer that described circulating water system produces is for greening, life and other flat water, remainder enter and return the industrial impounding reservoir use after sewage works is processed; Described Equations of The Second Kind water centralized recovery obtains clear water by filter-pressing process after flocculation sediment is processed, a clear water part that obtains through press filtration is as the desulphurization system process water, and a part is as the ash discharge system process water.
2. according to the power generation industries waste water reclamation treatment process of claim 1, it is characterized in that first kind water through lime in earlier stage softening and depositing technology process and obtain to add the pure water of producing through reverse osmosis in the high rigidity clear water, make the processing water of described first kind water reach the natural water standard and use as the circulating water system make up water.
3. power generation industries wastewater treatment and renovation system that realizes power generation industries waste water reclamation treatment process, be comprised of process drain categorised collection system and processing, reclaiming system, described process drain recovery system comprises the water collecting basin that is arranged at each process drain mouth and the waste water reclamation pond formation that links to each other by pipeline with water collecting basin; Described waste water reclamation pond comprises that first kind water waste water reclamation pond and Equations of The Second Kind water waste water reclamation pond form, and wherein first kind water waste water reclamation pond is decided the platoon sewage collecting basin and linked to each other with steam turbine apparatus cools wastewater collecting basin with Water Treatment wastewater collecting basin, boiler sampling water coolant wastewater collecting basin, boiler respectively; Equations of The Second Kind water waste water reclamation pond links to each other with ground flushing water water collecting basin with desulphurization system process drain wastewater collecting basin, component cooling water water collecting basin, water bath dust-removing overflow water water collecting basin for subsequent use respectively, and the sewage in described each water collecting basin is squeezed into corresponding waste water reclamation pond through the pump pressure mode; Described first kind waste water reclamation pond by the road successively with the softening treating pond of lime, flocculation sediment treating pond, and dilution neutralizing treatment pond link to each other; Described Equations of The Second Kind waste water reclamation pond links to each other with the waste water flocculating treating pond by the road, and the outlet pipeline in described flocculation treatment pond links to each other with plate type pressure filter through force (forcing) pump; The outlet pipeline in described dilution neutralizing treatment pond links to each other with the circulating water system water pipe through small pump; The water outlet of described plate type pressure filter links to each other with desulphurization system process water pipeline and ash discharge system water pipeline respectively by the road.
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| CN105540958A (en) * | 2016-01-26 | 2016-05-04 | 河北省电力勘测设计研究院 | Zero-discharge treatment process of power plant wastewater |
| CN109293073A (en) * | 2018-11-14 | 2019-02-01 | 林方杰 | A kind of thermal power plant's sewage treatment process |
| CN109911958A (en) * | 2019-04-03 | 2019-06-21 | 克拉玛依沃森环保科技有限公司 | A kind of boiler blowdown water recycling technique |
| CN110668605A (en) * | 2019-10-25 | 2020-01-10 | 国电常州发电有限公司 | Thermal power plant wastewater treatment method |
| WO2023142170A1 (en) * | 2022-01-25 | 2023-08-03 | 国网河北省电力有限公司电力科学研究院 | Method and system for reusing circulating water sewage as desulfurization process water |
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