CN104129824A - Method for heat-engine plant desulfurization wastewater comprehensive treatment and dust particle emission reduction - Google Patents
Method for heat-engine plant desulfurization wastewater comprehensive treatment and dust particle emission reduction Download PDFInfo
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- CN104129824A CN104129824A CN201410361990.1A CN201410361990A CN104129824A CN 104129824 A CN104129824 A CN 104129824A CN 201410361990 A CN201410361990 A CN 201410361990A CN 104129824 A CN104129824 A CN 104129824A
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Abstract
The invention discloses a method for heat-engine plant desulfurization wastewater comprehensive treatment and dust particle emission reduction. The method is suitable for wastewater produced by flue gas wet-method desulfurization of a heat-engine plant and other high-salt content wastewater. The method is characterized in that in a waste liquid evaporation drying tower, heat of flue gas and high-temperature adjustment hot air are used for evaporation curing treatment on the wastewater sprayed by an atomizing nozzle, residue obtained by waste liquid evaporation drying are mixed with dust particles in the flue gas so that large particles are obtained by aggregation, the large particles are deposited on the bottom of the waste liquid evaporation drying tower under the action of gravity and a centrifugal force and then are discharged by an ash system, and fine particles in the flue gas goes through the top of the waste liquid evaporation drying tower with the flue gas, then enter into an electric precipitator and then are removed. The method can simply and effectively treat desulphurization wastewater. The fine particles and the liquid drops are aggregated to form the large particles and the large particles are deposited on the bottom of the waste liquid evaporation drying tower so that power plant dust particle discharge is reduced. The method has simple processes, improves flue gas humidity at an inlet of a deduster, realizes real zero discharge of the heat-engine plant desulfurization wastewater and reduces the pollution produced by dust particles on the atmospheric environment.
Description
Technical field
The present invention relates to be applicable to heat-engine plant desulfurized waste water and flue gases purification field, relate in particular to a kind of heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing discharge-reducing method.
Background technology
At present, thermal power plant's minimizing sulfur dioxide emissions approach mainly contains: rear desulfurization, i.e. flue gas desulfurization of desulfurization and burning in desulfurization before burning, burning.Flue gas desulfurization is considered to control the most effective approach of sulphur dioxide emission.Wet desulfurization of flue gas by limestone-gypsum method technique because its applicable coal scope is wide, be suitable for that coal sulphur content scope is large, desulfuration efficiency is high, system availability is high, absorption agent utilization ratio is high, Wingdale source is abundant and the advantage such as cheapness, technical maturity, serviceability height, become and in present stage world wide, apply flue gas desulfurization technique the most widely.But in wet desulfurization of flue gas by limestone-gypsum method technological process, can produce a large amount of desulfurization wastewaters, needing to process could qualified discharge.Compared with the desulfurization wastewater trade effluent general with thermal power plant, water-quality ratio is more special, is mainly manifested in the following aspects: (1) waste water is slightly acidic, and PH is 4～6; (2) suspension content is high, but particle is tiny, and major ingredient is gypsum, and next also has from adding calcium carbonate and calcium sulfite etc. in the flying dust of flue gas, sweetening process; (3) in waste water, contain soluble chloride, fluorochemical etc.; (4) in waste water, contain the metallic elements such as Ca, Mg, Na, Pb, Cd, Cr, Ni, Hg, Co, Cu, Al, Zn, Mn, wherein major part is the heavy metal element of restriction in the existing sewage drainage standard of thermal power plant (GB8978-1996); (5), from water-quality guideline, in desulfurization wastewater, chemical oxygen demand is also one of transnormal items.The desulfurization wastewater bringing is thus processed problem also becomes a new problem in fuel-burning power plant design, production and scientific research.
Current, fuel-burning power plant desulfurization wastewater often adopts neutralization, precipitation, flocculation and conventional chemical treatment techniques concentrated and clarification, but chemical process processing cost is high, and needs constantly to add pharmaceutical chemicals, and labor intensive, can not recycle.In another chemical process processed waste water, chlorion still cannot be removed.At present, the whole nation 90% and above thermal power generation unit use Wet Flue Gas Desulfurization Technique, and the desulfurization processing of steel industry, produce a large amount of desulfurization wastewaters.
Summary of the invention
For above shortcomings in prior art, the invention provides a kind of heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing discharge-reducing method, the method utilizes coal steam-electric plant smoke to desulfurization wastewater, or other is difficult to recycle the waste water that saltiness is high, first by pressure filter separating treatment, after evaporate solidification treatment, have cost low, do not take up an area, the simple feature of technique, and can effectively solve the problem of power plant's turning dust deposit in flue, reduce power plant's maintenance workload.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
Heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing discharge-reducing method, the method comprises the steps:
1) waste water after thionizer desulfurization aspirated and is delivered into settling bowl by pipeline through waste drains pump, in settling bowl, pass through preliminary sedimentation and separate;
2) clear liquid on settling bowl top is transported to medium atomization nozzle by pipeline under infusion pump effect after fine filter filters, and sprays into waste liquid evaporate to dryness tower under the atomizing of atomizing nozzle;
3) the required pressurized air of atomizing nozzle is to enter interchanger by pipeline under the effect of air compressor machine, is heated to after certain temperature by interchanger, sends into atomizing nozzle;
4) waste water is atomized as fine drop after atomizing nozzle in waste liquid evaporate to dryness tower, flue gas from air preheater enters from the bottom of waste liquid evaporate to dryness tower, spray into from the tuyere of waste liquid evaporate to dryness tower bottom through variable valve from the warm air in air preheater air vout branch road, fine drop is mixed and is heated to temperature of saturation in waste liquid evaporate to dryness tower with flue gas and warm air, until evaporate to dryness;
5) in flue gas, the resistates after fine particle and waste liquid evaporate to dryness bumps and agglomeration, form macrobead thing, macrobead thing is deposited on the bottom of waste liquid evaporate to dryness tower and discharges from the bottom of waste liquid evaporate to dryness tower under gravity and centrifugal action, and other small particle enters in electric precipitator and is removed through the top of waste liquid evaporate to dryness tower with flue gas;
6) settling bowl bottom sediments containing the large waste liquid of mud under the effect of mud scraper, pool bottom sludge is scraped to the middle lowest part to pond, under sludge pump effect, be delivered into pressure filter by pipeline, through pressure filter centrifugation, solids enters ash-slag disposal system, and liquids is returned to settling bowl by pipeline.
As a preferred embodiment of the present invention, described atomizing nozzle is arranged on the top of the smoke inlet on waste liquid evaporate to dryness tower, atomizing nozzle is multiple and is evenly distributed on waste liquid evaporate to dryness inner wall of tower circumference, the flue gas flow direction formation square crossing that the waste water of atomizing nozzle ejection and smoke inlet pass into.
As another kind of preferred version of the present invention, the pressure ratio that pressurized air and desulfurization wastewater enter in atomizing nozzle is 0.25～0.6, and the size droplet diameter after atomizing nozzle atomization is 0～200 μ m, and speed is 50～100m/s.
As a modification of the present invention scheme, in interchanger, heating medium is steam, and steam derives from the steam of the auxiliary header of power plant, the steam that boiler export steam is extracted out through live steam or the steam turbine low-pressure end of pressure and temperature reducing.
Scheme is as a further improvement on the present invention uniformly distributed multiple tuyeres on the bottom circumference of waste liquid evaporate to dryness tower, and the outlet-inclined impeller vane of tuyere upwards.
The present invention is as the preposition flue gas treatment technology of thionizer, and hot flue gas obtains moistening and lowering temperature at this, can replace the spray cooling processing of desulfuration absorbing tower entrance, and increases smoke moisture.Make like this moisture vaporization losses in desulfuration absorbing tower reduce, be equivalent to the part water in recycle sweetening process.Compared with prior art, the present invention also tool have the following advantages:
1, the present invention utilizes has discrepancy in elevation flue between fuel-burning power plant air preheater and electric precipitator, centre arranges waste liquid evaporate to dryness tower, utilization enters and passes into high temperature air at the bottom of waste liquid evaporate to dryness tower flue gas heat and tower desulfurization wastewater is carried out to atomization and vaporization processing, micron order tiny solid particle in waste water, various ions, after heavy metal element drying crystalline, be blended in flue gas with dust, macrobead thing is also discharged at the bottom of falling to tower, small particle enters electric precipitator with flue gas and is caught by electrode, with the outer row of ash, waste steam is arranged outward with flue gas, not only can realize so the real zero release of desulfurization wastewater, reduce the discharge of power plant's dust granules thing, meet the actual requirement of environmental protection, and can save the processing cost in traditional chemical method.
2, can conveniently solve current desulfurization wastewater by the inventive method and process a difficult problem, and processing method is simple, investment and running cost low.
3, make full use of heat and additional high temperature compressed air medium atomization and the disturbance of flue gas, can accelerate the quick evaporate to dryness of waste liquid, and ensure that in waste liquid evaporate to dryness tower, flue-gas temperature remains on flue gas acid dew point temperature, and the humidity that can improve flue gas and enter electric precipitator, has improved electric precipitator dust removing effects.
4, after the method puts goods on the market operation, can replace existing various desulfurization wastewater treatment technology and use in thermal power generation unit.Will reduce largely desulfurization wastewater processing cost and equipment maintenance cost, in the desulfurization wastewaters such as coal-fired thermal power generation unit, promote the use of, market outlook are huge.
Brief description of the drawings
Fig. 1 is the structural representation of heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing emission reduction device.
In accompanying drawing: 1-atomizing nozzle; 2-fine filter; 3-infusion pump; 4-settling bowl; 5-waste drains pump; 6-sludge pump; 7-pressure filter; 8-mud scraper; 9-tuyere; 10-waste liquid evaporate to dryness tower; 11-variable valve; 12-interchanger; 13-air compressor machine; 14-smoke inlet.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing discharge-reducing method, heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing emission reduction device are adopted in the method, as shown in Figure 1, this device comprises waste liquid evaporate to dryness tower 10, fine filter 2, infusion pump 3, settling bowl 4, mud scraper 8, waste drains pump 5, sludge pump 6, pressure filter 7, variable valve 11, air compressor machine 13 and interchanger 12, multiple atomizing nozzles 1 are evenly set in the lower circumference of waste liquid evaporate to dryness tower 10, multiple tuyeres 9 are evenly set on the bottom circumference of waste liquid evaporate to dryness tower 10, and the outlet-inclined impeller vane of tuyere 9 upwards.On waste liquid evaporate to dryness tower 10, be provided with smoke inlet 14, the position height of smoke inlet 14 is between tuyere 9 and atomizing nozzle 1, mud scraper 8 is arranged on the bottom of settling bowl 4, can prevent that sludge absorption is in the bottom of settling bowl 4, be convenient to take away in time containing the large waste liquid of mud, the entrance of settling bowl 4 is connected by waste water transport pipe with the waste drains pump of outside thionizer 5.
The method comprises the steps:
1) waste water after thionizer desulfurization aspirated and is delivered into settling bowl 4 by pipeline through waste drains pump 5, in settling bowl 4, passing through preliminary sedimentation and separate.
2) clear liquid on settling bowl 4 tops is transported to medium atomization nozzle 1 by pipeline under infusion pump 3 effects after fine filter 2 filters, and sprays into waste liquid evaporate to dryness tower 10 under the atomizing of atomizing nozzle 1.
Desulfurization wastewater before entering nozzle can be carried out to heat treated in advance, allow its temperature be controlled at 95 DEG C of left and right (being that its boiling temperature is following), mix with pressurized air again, spray into waste liquid evaporate to dryness tower through nozzle, can accelerate like this waste liquid evaporate to dryness speed in waste liquid evaporate to dryness tower, reduce the evaporate to dryness time, can further control flue-gas temperature in evaporate to dryness tower and reduce amplitude, ensure in evaporate to dryness tower that flue-gas temperature is on flue gas acid dew point temperature.
3) the required pressurized air of atomizing nozzle 1 is to enter interchanger 12 by pipeline under the effect of air compressor machine 13, is heated to after certain temperature by interchanger 12, sends into atomizing nozzle 1.
4) waste water is atomized as fine drop after atomizing nozzle 1 in waste liquid evaporate to dryness tower 10, flue gas from air preheater enters from the bottom of waste liquid evaporate to dryness tower 10, spray into from waste liquid evaporate to dryness tower 10 bottom tuyeres 9 through variable valve 11 from the warm air in air preheater air vout branch road (typical temperature is at 300 DEG C～400 DEG C), fine drop is heated to temperature of saturation with flue gas and warm air in interior mixing of waste liquid evaporate to dryness tower 10, until evaporate to dryness.Desulfurization wastewater by pump pressurize mix by a certain percentage with pressurized air after through atomizing nozzle atomization, pressurized air is first through pressurization post-heating, the pressure ratio that pressurized air and desulfurization wastewater enter in atomizing nozzle 1 is 0.25～0.6, size droplet diameter after atomizing nozzle 1 atomization is 0～200 μ m, and speed is 50～100m/s.Atomizing nozzle 1 is arranged on the top of the smoke inlet 14 on waste liquid evaporate to dryness tower 10, atomizing nozzle 1 is multiple and is evenly distributed on waste liquid evaporate to dryness tower 10 inwall circumference, the flue gas flow direction formation square crossing fluidic arrangement that the waste water that atomizing nozzle 1 sprays and smoke inlet pass into.
In interchanger 12, heating medium is steam, and steam derives from the steam of the auxiliary header of power plant, the steam that boiler export steam is extracted out through live steam or the steam turbine low-pressure end of pressure and temperature reducing.
At the bottom of waste liquid evaporate to dryness tower, spray into high temperature air, can strengthen the 10 interior disturbances of waste liquid evaporate to dryness tower, increase drop residence time in waste liquid evaporate to dryness tower, accelerate waste liquid evaporate to dryness, prevent that liquid is collected in bottom, causes being bonded together of equipment corrosion and lime-ash.In addition, at waste liquid evaporate to dryness tower, 10 top exit places can add filtration unit or tripping device, further reduce kind of dust.
Waste liquid evaporate to dryness tower 10 provides sufficient space for the rapid evaporate to dryness that sprays into waste liquid, the heat of flue gas impels waste liquid evaporation, its bottom can arrange in the even micro-tendency of surrounding that tuyere 9 sprays into multiply high temperature air and strengthens waste liquid and flue gas disturbance and heat exchange, further accelerates waste liquid evaporate to dryness.
5) in flue gas, the resistates after fine particle and waste liquid evaporate to dryness bumps and agglomeration, form macrobead thing, macrobead thing is deposited on the bottom of waste liquid evaporate to dryness tower 10 and discharges from the bottom of waste liquid evaporate to dryness tower 10 under gravity and centrifugal action, and other small particle enters in electric precipitator and is removed through the top of waste liquid evaporate to dryness tower 10 with flue gas.
6) settling bowl 4 bottom sediments containing the large waste liquid of mud under the effect of mud scraper 8, pool bottom sludge is scraped to the middle lowest part to pond, under sludge pump 6 effects, be delivered into pressure filter 7 by pipeline, through pressure filter 7 centrifugations, solids enters ash-slag disposal system, and liquids is returned to settling bowl 4 by pipeline.
Can using the dust stratification at the bottom of waste liquid evaporate to dryness tower and after pressure filter is processed solid waste after directly harmlessness disposing is carried out in outward transport as material of construction or Cement industry raw material.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. heat-engine plant desulfurized wastewater comprehensive treatment and dust granules thing discharge-reducing method, is characterized in that: the method comprises the steps:
1) waste water after thionizer desulfurization aspirated and is delivered into settling bowl (4) by pipeline through waste drains pump (5), in settling bowl (4), pass through preliminary sedimentation and separate;
2) clear liquid on settling bowl (4) top is transported to medium atomization nozzle (1) by pipeline under infusion pump (3) effect after fine filter (2) filters, and sprays into waste liquid evaporate to dryness tower (10) under the atomizing of atomizing nozzle (1);
3) the required pressurized air of atomizing nozzle (1) is to enter interchanger (12) by pipeline under the effect of air compressor machine (13), is heated to after certain temperature by interchanger (12), sends into atomizing nozzle (1);
4) waste water is atomized as fine drop after atomizing nozzle (1) in waste liquid evaporate to dryness tower (10), flue gas from air preheater enters from the bottom of waste liquid evaporate to dryness tower (10), spray into from the tuyere (10) of waste liquid evaporate to dryness tower (10) bottom through variable valve (11) from the warm air in air preheater air vout branch road, fine drop is mixed and is heated to temperature of saturation in waste liquid evaporate to dryness tower (10) with flue gas and warm air, until evaporate to dryness;
5) in flue gas, the resistates after fine particle and waste liquid evaporate to dryness bumps and agglomeration, form macrobead thing, macrobead thing is deposited on the bottom of waste liquid evaporate to dryness tower (10) and discharges from the bottom of waste liquid evaporate to dryness tower (10) under gravity and centrifugal action, and other small particle enters in electric precipitator and is removed through the top of waste liquid evaporate to dryness tower (10) with flue gas;
6) settling bowl (4) bottom sediments containing the large waste liquid of mud under the effect of mud scraper (8), pool bottom sludge is scraped to the middle lowest part to pond, under sludge pump (6) effect, be delivered into pressure filter (7) by pipeline, through pressure filter (7) centrifugation, solids enters ash-slag disposal system, and liquids is returned to settling bowl (4) by pipeline.
2. heat-engine plant desulfurized wastewater comprehensive treatment according to claim 1 and dust granules thing discharge-reducing method, it is characterized in that: described atomizing nozzle (1) is arranged on the top of the smoke inlet (14) on waste liquid evaporate to dryness tower (10), atomizing nozzle (1) is multiple and is evenly distributed on waste liquid evaporate to dryness tower (10) inwall circumference, the flue gas flow direction formation square crossing that the waste water of atomizing nozzle (1) ejection and smoke inlet pass into.
3. heat-engine plant desulfurized wastewater comprehensive treatment according to claim 2 and dust granules thing discharge-reducing method, it is characterized in that: the pressure ratio that pressurized air and desulfurization wastewater enter in atomizing nozzle (1) is 0.25～0.6, size droplet diameter after atomizing nozzle (1) atomization is 0～200 μ m, and speed is 50～100m/s.
4. heat-engine plant desulfurized wastewater comprehensive treatment according to claim 1 and dust granules thing discharge-reducing method, it is characterized in that: in interchanger (12), heating medium is steam, steam derives from the steam of the auxiliary header of power plant, the steam that boiler export steam is extracted out through live steam or the steam turbine low-pressure end of pressure and temperature reducing.
5. heat-engine plant desulfurized wastewater comprehensive treatment according to claim 1 and dust granules thing discharge-reducing method, is characterized in that: on the bottom circumference of waste liquid evaporate to dryness tower (10), be uniformly distributed multiple tuyeres (9), the outlet-inclined impeller vane of tuyere (9) upwards.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105645494A (en) * | 2016-01-11 | 2016-06-08 | 新疆环境工程技术有限责任公司 | Spray-drying sewage treatment plant |
| CN106145497A (en) * | 2016-08-04 | 2016-11-23 | 山东奥特高科环保科技有限公司 | A kind of desulfurization wastewater recycles technique and device |
| CN106186117A (en) * | 2016-08-29 | 2016-12-07 | 金川集团股份有限公司 | A kind of processing means containing mud acid water and processing method |
| CN106219895A (en) * | 2016-09-06 | 2016-12-14 | 大唐环境产业集团股份有限公司 | A kind of water treatment facilities utilizing fume afterheat and method for treating water |
| CN107010687A (en) * | 2017-04-27 | 2017-08-04 | 张玉君 | A kind of desulfurizing waste water processing device and its control system and control method |
| CN107445232A (en) * | 2017-09-30 | 2017-12-08 | 北京兴晟科技有限公司 | A kind of Waste water concentrating device |
| CN108793557A (en) * | 2018-06-14 | 2018-11-13 | 龙净科杰环保技术（上海）有限公司 | A kind of desulfurization wastewater bypass flue evaporation treatment process and system |
| CN109231321A (en) * | 2018-10-30 | 2019-01-18 | 宜禾股份有限公司 | A kind of cloth dyeing waste liquid evaporating |
| CN110282718A (en) * | 2019-07-22 | 2019-09-27 | 广东佳德环保科技有限公司 | A kind of system of the reduction method processing containing nitrate wastewater |
| CN110803732A (en) * | 2019-11-29 | 2020-02-18 | 济南山源环保科技有限公司 | Drying and solidifying device for zero discharge of wastewater |
| CN112479293A (en) * | 2020-11-10 | 2021-03-12 | 西安西热水务环保有限公司 | Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower |
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| CN105645494B (en) * | 2016-01-11 | 2019-03-01 | 新疆环境工程技术有限责任公司 | A kind of atomization drying sewage disposal device |
| CN105645494A (en) * | 2016-01-11 | 2016-06-08 | 新疆环境工程技术有限责任公司 | Spray-drying sewage treatment plant |
| CN106145497A (en) * | 2016-08-04 | 2016-11-23 | 山东奥特高科环保科技有限公司 | A kind of desulfurization wastewater recycles technique and device |
| CN106186117A (en) * | 2016-08-29 | 2016-12-07 | 金川集团股份有限公司 | A kind of processing means containing mud acid water and processing method |
| CN106186117B (en) * | 2016-08-29 | 2023-06-02 | 金川集团股份有限公司 | Treatment device and treatment method for mud-containing acid water |
| CN106219895A (en) * | 2016-09-06 | 2016-12-14 | 大唐环境产业集团股份有限公司 | A kind of water treatment facilities utilizing fume afterheat and method for treating water |
| CN107010687A (en) * | 2017-04-27 | 2017-08-04 | 张玉君 | A kind of desulfurizing waste water processing device and its control system and control method |
| CN107445232A (en) * | 2017-09-30 | 2017-12-08 | 北京兴晟科技有限公司 | A kind of Waste water concentrating device |
| CN108793557A (en) * | 2018-06-14 | 2018-11-13 | 龙净科杰环保技术（上海）有限公司 | A kind of desulfurization wastewater bypass flue evaporation treatment process and system |
| CN108793557B (en) * | 2018-06-14 | 2021-10-22 | 龙净科杰环保技术（上海）有限公司 | Desulfurization wastewater bypass flue evaporation treatment process and system |
| CN109231321A (en) * | 2018-10-30 | 2019-01-18 | 宜禾股份有限公司 | A kind of cloth dyeing waste liquid evaporating |
| CN110282718A (en) * | 2019-07-22 | 2019-09-27 | 广东佳德环保科技有限公司 | A kind of system of the reduction method processing containing nitrate wastewater |
| CN110282718B (en) * | 2019-07-22 | 2024-05-14 | 广东佳德环保科技有限公司 | System for treating nitrate-containing wastewater by reduction method |
| CN110803732A (en) * | 2019-11-29 | 2020-02-18 | 济南山源环保科技有限公司 | Drying and solidifying device for zero discharge of wastewater |
| CN112479293A (en) * | 2020-11-10 | 2021-03-12 | 西安西热水务环保有限公司 | Wastewater and flue gas waste heat drying system and method based on semi-dry desulfurization tower |
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