CN102489136A - Flue gas desulfurizing waste water recovering process and device - Google Patents
Flue gas desulfurizing waste water recovering process and device Download PDFInfo
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- CN102489136A CN102489136A CN2011104217983A CN201110421798A CN102489136A CN 102489136 A CN102489136 A CN 102489136A CN 2011104217983 A CN2011104217983 A CN 2011104217983A CN 201110421798 A CN201110421798 A CN 201110421798A CN 102489136 A CN102489136 A CN 102489136A
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Abstract
The invention relates to a flue gas desulfurizing waste water recovering process, which includes steps of separating underflow slurry from gypsum slurry from the bottom of a desulfurizing tower by means of cyclone and leading the underflow slurry into a vacuum belt dehydrator; draining waste water without washing water, which is removed from the front section of the vacuum belt dehydrator, into a closed waste water collection box after solid-phase impurity therein is filtered, leading high-temperature raw flue gas before being desulfurized into a water layer of the waste water collection box in a spray dispersing manner, leading steam which is generated by spraying and evaporating waste water into a raw flue gas inlet of the desulfurizing tower along with flue gas; separating crystals from impurity of the waste water in the waste water collection box by concentrating and gathering, circulating waste water between the bottom of the waste water collection box and a filter by the aid of a water pump so as to remove impurity; and finally dehydrating the solid impurity captured by the filter and then burying the same in deep pits or serving the same as gypsum seed crystal. Desulfurizing waste water is heated into steam by heat of high-temperature flue gas, the steam can be recovered by a desulfurizing system, and chloridion, metal ion, sulfate ion and solid impurity can be removed effectively.
Description
Technical field
The present invention relates to a kind of coal-fired plant flue gas desulfurization waste-water recovery and treatment method and device, method and device that the desulfurization wastewater of particularly the thick plaster slurry liquid of lime/lime stone wet desulphurization being deviate from recycles.
Background technology
Contain multiple materials such as sulfide, chloride, nitrate in the fire coal, contain a large amount of SO in the flue gas that burning produces
2And NO
XReach nuisances such as dust, so coal-fired plant's boiler smoke must be through desulfurization, denitration and dust removal process before discharging.SO wherein
2The lime/lime stone wet desulphurization method that removes most employing by-product gypsum; In the absorption tower, spray flue gas with the lime/lime stone slurries; Make the calcium carbonate reaction in the wherein sulfur dioxide and slurries generate calcium sulfite and calcium sulfate; This mix slurry is carried contents of many kinds of heavy metal ion such as salts such as the chloride, nitrate of suspended state dust, solubility and Hg, Ph, Ni, As, Cd, Cr secretly and is reduced to the tower still; Blast air and make the part calcium sulfite oxidation become calcium sulfate (being gypsum) deposition, with tower still bottom with CaSO
4Be that main gypsum slurries is discharged, isolate underflow liquid, obtain by-produced gypsum by vacuum belt dewaterer vacuum draw dehydration back again through the gypsum cyclone; In the desulfurization wastewater that vacuum belt dewaterer is deviate from then enrichment the above-mentioned contents of many kinds of heavy metal ion and the solubility salt that discharge forbidden; At present, these waste water adopt multisteps such as neutralization, reaction, flocculation, deposition to handle suddenly more, make above-mentioned impurity enriched in sediment or suspension; Behind separating and dehydrating, mud cake is transported to the slag field buries processing.Above method skill is complicated, and step is many, because the waste water impurity complicated component; Need correspondence to be provided with machine sulfide medicine system, flocculant medicine system, flocculation aid preparation and dosing system, facilities such as hydrochloric acid dosing system, equipment investment and operating cost are high; And can't handle the chlorion in the waste water, and and chlorion can cause equipment corrosion, the waste water after therefore handling can not circulate and return desulphurization system and utilize; Can only dilute the back discharging, still have the hidden danger of environmental pollution.
Summary of the invention
The object of the invention provides a kind of coal-fired plant flue gas desulfurization waste-water recovery and treatment method; It separates the impurity (comprising chlorion) in the desulfurization wastewater of removing to deviate from the thick plaster slurry liquid of lime/lime stone wet desulphurization with simple technology; And the waste water after handling can return desulphurization system and recycle, and reduces the discharge of wastewater pollution on the environment.The present invention also provides the isolated plant of this method.
The flue gas desulfurization waste-water recovery and treatment method is following: go out top stream dilute slurry and underflow underflow liquid from the gypsum slurries at the bottom of the desulfurizing tower through cyclonic separation, the former returns desulfurizing tower and makes spray liquid, and the latter introduces vacuum belt dewaterer; In vacuum belt dewaterer, back segment adds water washing; In, the waste water deviate from of back segment vacuum belt dewaterer returns desulfurizing tower and is used for spray; The waste water that does not contain washings that the vacuum belt dewaterer leading portion is deviate from is drawn; Through getting into the waste water collection case of a sealing behind the filtering solid phase impurity; To feed in the water layer of waste water collection case with the mode that spraying disperses without the former flue gas of the high temperature of desulfurization, with waste water atomizing in the case and evaporation at high temperature, the water vapour of generation together feeds the former smoke inlet of desulfurizing tower with flue gas; The impurity of while waste water in waste water collection case is by enrichment method and have crystallization to separate out; Extract waste water to filter through water pump from waste water collection case bottom; Clear water in the filtering water behind the impurity returns waste water collection case; Form water circulation so continuously or discontinuously, at last with filter traps to solid impurity dehydration back dell bury or as gypsum seed.
The low concentration desulfurization wastewater that this method is deviate from the desulfurated plaster slurries returns desulfurizing tower and is used for spraying in the tower, and the desulfurization wastewater of high concentration separates with impurity through high-temperature evaporation, returns desulfurizing tower with the form of steam.The vaporization energy of desulfurization wastewater comes from the heat that the former flue gas of high temperature is held; Promptly draw one undesulfured hot flue gas and send under the waste water liquid level of desulfurization wastewater collection case with the dispersion air-flow that is uniformly distributed with from former flue gas flue collector; Hot flue gas (flue-gas temperature is generally 130～280 ℃) in water behind a large amount of bubblings self temperature reduce; Simultaneously heat is passed to desulfurization wastewater and make it rapid evaporation; Flue gas after the cooling carries water vapour and discharges waste water collection case, and mixes at the inlet of desulfurizing tower from the former flue gas of the high temperature of flue collector, goes into the tower desulfurization.Water vapour is unsaturation in the flue gas after above-mentioned mixing, water droplet can not occur, therefore can not cause corrosion.On the other hand, the water in the waste water collection case constantly is evaporated concentrated, Ca wherein
+, chlorion, heavy metal ion, SO
4 2-, SO
3 2-Separate out Deng impurity generation gypsum crystallization or various soluble salt crystallization.In sum, the heat that this method utilizes high-temperature flue gas itself to hold is heated into desulfurization wastewater can be by the water vapour of desulphurization system recycling, and the while high-temperature flue gas is by humidifying cooling, and flue gas cool-down helps SO
2Absorbing and removing, and the aqueous vapor of this part humidification is used to compensate the water yield of evaporation in the desulphurization system, reduced desulfurization water.This flue gas desulfurization waste-water processing method technology is simple, and flow process is reasonable, reaches effect in energy saving and environmental protection.
The present invention also is provided for the device of above-mentioned coal-fired plant flue gas desulfurization waste-water recycling; By the waste water acquisition system; Filter; Desulfurization wastewater collection case is formed with the air-flow disperser that is arranged in this case; Said waste water acquisition system is by vacuum belt dewaterer; Be arranged in a plurality of vacuum chambers that link to each other with vavuum pump of vacuum belt dewaterer downside and be connected in first vacuum chamber and the U type liquid-gas separator of back between one vacuum chamber; The fluid-tight chamber of U type bottom for enlarging; The bottom of fluid-tight chamber communicates with the not filtration side of filter by the water sampling pipeline, and the filtration side of filter communicates with desulfurization wastewater collection case; Air-flow disperser in the said desulfurization wastewater collection case is made up of an air-flow house steward, a plurality of dispersion pipe and a plurality of spray guns of being installed on each dispersion pipe; A plurality of dispersion pipes all communicate with the air-flow house steward, and said dispersion house steward links to each other with former flue gas house steward's fairlead by the outer blower fan of desulfurization wastewater collection case; Be provided with circulation line and circulating pump between said desulfurization wastewater collection case bottom and the filter.
Said filter comprises a plurality of filter chambers, and said collection tube is provided with the multichannel switch that can communicate with each filter chamber's device selection above filter.
Said filter is fixed in the case of desulfurization wastewater collection box top; Its below is provided with the filtrating overflow launder; The filter outer wall is provided with the baffle plate that extends downward below the overflow notch, forms the fluid-tight air chamber between baffle plate and the overflow launder, and the fluid-tight air chamber links to each other with vavuum pump through the vacuum filtration pipe.
Said collection pipeline and circulation line are provided with check-valves.
Description of drawings
Fig. 1 is the embodiment system schematic that includes the flue gas desulfurization waste-water recycling and processing device of desulfurizing tower.
Among the figure, the former flue gas house steward of 1-, 2,9, the 27-switch valve, the former flue gas fairlead of 3-, 4-blower fan, 5-desulfurization wastewater collection case; 6-air-flow house steward, 6-1-air-flow dispersion pipe, 7-spray gun, 8-blast pipe, 10-desulfurizing tower, 11-desulfurization flue gas smoke exhaust pipe; The 12-vacuum belt dewaterer, the 13-vavuum pump, 14-first vacuum chamber, the fluid-tight chamber of 15-U type liquid-gas separator, 16-waste water is gathered pipeline, 17; The 20-check-valves, 18-waste water circulating pump, 19-waste water circulation pipe, 21-multichannel switch, 22-filter, 23-desulfurizing tower slush pump; 24-gypsum cyclone, 25-gas-liquid separator, 26-baffle plate, 28-liquid seal trough, 29,30-vacuum filtration pipe, A, B, C-filter chamber.
The specific embodiment
The method and the flow process of the recycling of embodiment 1 flue gas desulfurization waste-water
Like Fig. 1; Isolate top stream dilute slurry and underflow underflow liquid from the desulfurated plaster slurries at the bottom of desulfurizing tower 10 towers through cyclone 24, eddy flow top stream dilute slurry returns desulfurizing tower 10 and is used for spray, and underflow underflow liquid is introduced vacuum belt dewaterer 12; Simultaneously by vavuum pump 13 vacuum dehydrations; Use water washing on the belt after first vacuum chamber of vacuum belt dewaterer, remove soluble salt in the gypsum, the gypsum by-product after the tail end of vacuum belt dewaterer 12 must dewater; Vacuum belt dewaterer 12 is provided with a plurality of vacuum chambers that communicate with vavuum pump 13, and except that first vacuum chamber 14, it is low concentration wastewater that the gypsum that each vacuum chamber is collected is deviate from water; Via vacuum filtration pipe 29; Through gas-liquid separator 25, deposit melt pit in, send desulfurizing tower 10 back to through sump pump again and be used for spray.The desulfurization wastewater that first vacuum chamber 14 is collected is the filtrating that is not washed water-reducible high chloride ion concentration; This waste water is drawn from the fluid-tight chamber 15 of U type liquid-gas separator, gather pipeline 16 gravity flows (or carry with pump) to the filter 22 that is installed on the waste water collection case 5 through waste water.Filter 22 is fixed in the case at top of desulfurization wastewater collection case 5, and it comprises A, B, three filter chambers of C, and the below is provided with overflow launder 28; Filter 22 is provided with from outer wall and extends downward the baffle plate 26 below the notch of overflow launder 28, and baffle plate 26 stretches under the liquid level of overflow launder 28, and baffle plate 26 encloses above the liquid level of overflow launder 28 and forms the fluid-tight air chamber.The filtrating of filter 22 gets into waste water collection case 5 through overflow launder 28 overflows.A, B, three filter chambers of C alternately switch through multichannel switch 21, and at least one filter chamber is used for filtering, and all the other are subsequent use or be used to leave standstill the air-dry solid that is trapped.
The former flue gas of former flue gas house steward's 1 high temperature is sent into waste water collection case 5 from former flue gas fairlead 3 through high-temperature blower 4; Through air-flow house steward 6, dispersion pipe 6-1 with below hot flue gas to the waste water liquid level; At last by spray gun 7 ejections; Evenly disperse in waste water with the minute bubbles form, gas-liquid fully contacts, and waste water receives thermal evaporation.Disperse the flue-gas temperature behind the bubbling to reduce, and the steam that carries evaporation discharges from gas exhaust piping 8, the inlet of desulfurizing tower 10 with converge from former flue gas house steward 1 undesulfured high-temperature flue gas, go into desulfurizing tower 10 and carry out desulfurization.Along with the water in the waste water collection case 5 constantly evaporate, impurity is concentrated, wherein all contaminations ion as Ca
+, chlorion, heavy metal ion, SO
4 2-, SO
3 2-Thereby separate out and be removed Deng generating gypsum crystallization or various soluble salt crystallization.Be connected with waste water circulation pipe 19 and circulating pump 18 between the inlet of waste water collection case 5 bottoms and filter 22, the underflow waste water that waste water collection case 5 bottoms are concentrated is drawn to filter 22, and circulating filtration is removed solid repeatedly.
Waste water is gathered on pipeline 16 and the waste water circulation pipe 19 check-valves 17,20 is housed respectively, prevents to produce when pipeline from switching waste water and flows backwards.Link to each other through U type liquid-gas separator between first vacuum chamber 14 and the follow-up vacuum chamber, the effect of ventilation at a distance from liquid played in the fluid-tight chamber 15 of U type liquid-gas separator.The thin liquid that can prevent other vacuum chamber is sneaked into and is reduced the concentration of desulfurization wastewater in first vacuum chamber 14, to reduce the desulfurization wastewater discharge capacity, improves blowdown and treatment effeciency.
Filter 22 is made by the corrosion resistant filtrate of special-purpose material or alloy filter screen, be beneficial to that solid is held back and with high moisture content solids from, good water permeability, intensity is high, is easy to change safeguard.Vacuum filtration pipeline 30 draws from steam-water separation chamber 25 and connects negative pressure system, is used for filter 22 solid material suction filtration when full, opens valve 27 during suction filtration, and the siccative of suction filtration is poured in the specified containers, regularly transports processing.The filtrating that filter 22 leaches is gone into overflow launder 28, overflows in the waste water collection case 5 after forming certain liquid level, and this liquid level and coaming plate 26 form fluid-tights, prevent the vacuum leak that forms when vacuum filtration pipeline 30 is bled.
To the dewatered solid of suction filtration gained as as gypsum seed; Can do following processing: the desulfurization wastewater in the first emptying waste water collection case 5, fill with clear water, take out clean water with waste water circulating pump 18 and constantly carry out cycling elution valve 27 suction filtrations of open vacuum suction filtration pipeline 30 simultaneously; Soluble salt is removed in washing; Last gained be qualified gypsum seed, leacheate can be used and continue to reclaim soluble salt once again through waste water collection case 5 evaporation humidification crystallization salifies.
Enforcement case 2
Certain 2 * 330MW coal-firing units gas desulfurization waste water adopts the inventive method to handle, and compares result such as following table with traditional desulfurization wastewater processing method.
According to last table,, adopt the inventive method and device with the flue gas desulfurization waste-water of the coal-fired unit of 2 * 330MW; Traditional relatively desulfurization wastewater treatment technology, system is simple, is convenient to operation; Once investment is about traditional desulfurization wastewater treatment technology 1/3; The operation maintenance workload is little, and operating cost is merely 2/3 of traditional desulfurization wastewater treatment technology, and traditional desulfurization wastewater needs a large amount of medicament such as Ca (OH) of handling
2, clairtan, polyacrylamide, hydrochloric acid etc., and the present invention need not to add medicament.The tradition desulfurization wastewater is handled still has a large amount of chlorine-contained wastewaters to produce, and needs dilution discharge, and all waste water of the present invention all reclaim with effective minimizing desulphurization system water consumption.The tradition desulfurization wastewater has a large amount of mud to need landfill disposal, and the recyclable most of solid of method provided by the invention fully utilizes as gypsum seed, but the various metal soluble salt centralized collection landfills of minute quantity, also recyclable processing.
Claims (5)
1. flue gas desulfurization waste-water recovery and treatment method is characterized in that following steps: go out top stream dilute slurry and underflow underflow liquid from the gypsum slurries at the bottom of the desulfurizing tower through cyclonic separation, the former returns desulfurizing tower and makes spray liquid, and the latter introduces vacuum belt dewaterer; In vacuum belt dewaterer, back segment adds water washing; In, the waste water deviate from of back segment vacuum belt dewaterer returns desulfurizing tower and is used for spray; The waste water that does not contain washings that the vacuum belt dewaterer leading portion is deviate from is drawn; Through getting into the waste water collection case of a sealing behind the filtering solid phase impurity; To feed in the water layer of waste water collection case with the mode that spraying disperses without the former flue gas of the high temperature of desulfurization, with waste water atomizing in the case and evaporation at high temperature, the water vapour of generation together feeds the former smoke inlet of desulfurizing tower with flue gas; The impurity of while waste water in waste water collection case is by enrichment method and have crystallization to separate out; Extract waste water to filter through water pump from waste water collection case bottom; Clear water in the filtering water behind the impurity returns waste water collection case; Form water circulation so continuously or discontinuously, at last with filter traps to solid impurity dehydration back dell bury or serve as gypsum seed.
2. the device of the described flue gas desulfurization waste-water recovery and treatment method of claim 1; It is characterized in that by the waste water acquisition system; Filter; Desulfurization wastewater collection case is formed with the air-flow disperser that is arranged in this case; Said waste water acquisition system is by vacuum belt dewaterer; Be arranged in a plurality of vacuum chambers that link to each other with vavuum pump of vacuum belt dewaterer downside and be connected in first vacuum chamber and the U type liquid-gas separator of back between one vacuum chamber; The fluid-tight chamber of U type bottom for enlarging; The bottom of fluid-tight chamber communicates with the not filtration side of filter by the water sampling pipeline, and the filtration side of filter communicates with desulfurization wastewater collection case; Air-flow disperser in the said desulfurization wastewater collection case is made up of an air-flow house steward, a plurality of dispersion pipe and a plurality of spray guns of being installed on each dispersion pipe; A plurality of dispersion pipes all communicate with the air-flow house steward, and said dispersion house steward links to each other with former flue gas house steward's fairlead by the outer blower fan of desulfurization wastewater collection case; Be provided with circulation line and circulating pump between said desulfurization wastewater collection case bottom and the filter.
3. device according to claim 2 is characterized in that said filter comprises a plurality of filter chambers, and said collection tube is provided with the multichannel switch that can communicate with each filter chamber's device selection above filter.
4. device according to claim 3; It is characterized in that said filter is fixed in the case of desulfurization wastewater collection box top; Its below is provided with the filtrating overflow launder; The filter outer wall is provided with the baffle plate that extends downward below the overflow notch, forms the fluid-tight air chamber between baffle plate and the overflow launder, and the fluid-tight air chamber links to each other with vavuum pump through the vacuum filtration pipe.
5. according to claim 1 or 2 or 3 or 4 described devices, it is characterized in that said collection pipeline and circulation line are provided with check-valves.
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Cited By (12)
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|---|---|---|---|---|
| CN103272466A (en) * | 2013-05-02 | 2013-09-04 | 杭州蓝轩环保科技有限公司 | Flue gas desulphurization device and desulphurization method |
| CN103285733A (en) * | 2013-06-26 | 2013-09-11 | 贵州兴化化工股份有限公司 | Two-way utilization method and device for wet process circulation desulfurization recovered solution |
| CN103351066A (en) * | 2013-07-22 | 2013-10-16 | 中国大唐集团环境技术有限公司 | Novel wet flue gas desulfurization wastewater treatment method and system |
| CN103480262A (en) * | 2013-10-14 | 2014-01-01 | 中国计量学院 | Wastewater supply process for wet-process smoke desulfurization wastewater treatment system |
| CN104418447A (en) * | 2013-09-09 | 2015-03-18 | 中国石油化工股份有限公司 | Process for treating waste liquid from catalytic cracking flue gas desulfurization |
| CN105066146A (en) * | 2015-07-24 | 2015-11-18 | 南京赛佳环保实业有限公司 | System and method for treating high-concentration organic waste liquid |
| CN106365232A (en) * | 2016-11-15 | 2017-02-01 | 青岛达能环保设备股份有限公司 | Low-temperature sprinkling and evaporation treatment method for desulfurization waste water |
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| CN112551627A (en) * | 2020-11-26 | 2021-03-26 | 武汉天空蓝环保科技有限公司 | Desulfurization waste water enrichment facility and zero discharge system |
| CN112723453A (en) * | 2020-12-23 | 2021-04-30 | 武汉天空蓝环保科技有限公司 | Desulfurization wastewater zero-discharge system for dry slag cooling |
| CN113351391A (en) * | 2020-12-29 | 2021-09-07 | 武汉天空蓝环保科技有限公司 | Double-fluid atomization spray gun subsystem and desulfurization wastewater zero discharge system |
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| CN103272466A (en) * | 2013-05-02 | 2013-09-04 | 杭州蓝轩环保科技有限公司 | Flue gas desulphurization device and desulphurization method |
| CN103272466B (en) * | 2013-05-02 | 2015-09-16 | 杭州蓝轩环保科技有限公司 | A kind of flue gas desulfur device and sulfur method |
| CN103285733B (en) * | 2013-06-26 | 2015-12-02 | 贵州兴化化工股份有限公司 | A kind of two-way Application way of wet recycle desulfurization Ethylene recov and device |
| CN103285733A (en) * | 2013-06-26 | 2013-09-11 | 贵州兴化化工股份有限公司 | Two-way utilization method and device for wet process circulation desulfurization recovered solution |
| CN103351066A (en) * | 2013-07-22 | 2013-10-16 | 中国大唐集团环境技术有限公司 | Novel wet flue gas desulfurization wastewater treatment method and system |
| CN104418447A (en) * | 2013-09-09 | 2015-03-18 | 中国石油化工股份有限公司 | Process for treating waste liquid from catalytic cracking flue gas desulfurization |
| CN103480262B (en) * | 2013-10-14 | 2016-04-27 | 中国计量学院 | Wet flue gas desulfurization waste water treatment system waste water supply technique |
| CN103480262A (en) * | 2013-10-14 | 2014-01-01 | 中国计量学院 | Wastewater supply process for wet-process smoke desulfurization wastewater treatment system |
| CN105066146A (en) * | 2015-07-24 | 2015-11-18 | 南京赛佳环保实业有限公司 | System and method for treating high-concentration organic waste liquid |
| CN106391684A (en) * | 2016-11-11 | 2017-02-15 | 中建中环工程有限公司 | Soil restoration system |
| CN106365232A (en) * | 2016-11-15 | 2017-02-01 | 青岛达能环保设备股份有限公司 | Low-temperature sprinkling and evaporation treatment method for desulfurization waste water |
| CN110776181A (en) * | 2019-05-15 | 2020-02-11 | 浙江浩普环保工程有限公司 | Desulfurization wastewater zero-discharge process and system |
| CN112551627A (en) * | 2020-11-26 | 2021-03-26 | 武汉天空蓝环保科技有限公司 | Desulfurization waste water enrichment facility and zero discharge system |
| CN112551627B (en) * | 2020-11-26 | 2022-01-18 | 武汉天空蓝环保科技有限公司 | Desulfurization waste water enrichment facility and zero discharge system |
| CN112723453A (en) * | 2020-12-23 | 2021-04-30 | 武汉天空蓝环保科技有限公司 | Desulfurization wastewater zero-discharge system for dry slag cooling |
| CN112723453B (en) * | 2020-12-23 | 2023-08-04 | 武汉天空蓝环保科技有限公司 | Desulfurization wastewater zero discharge system for dry slag cooling |
| CN113351391A (en) * | 2020-12-29 | 2021-09-07 | 武汉天空蓝环保科技有限公司 | Double-fluid atomization spray gun subsystem and desulfurization wastewater zero discharge system |
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