CN205886577U - Zero discharge system of desulfurization waste water of coal -fired flue gas semidry method desorption fluorine chlorine - Google Patents

Zero discharge system of desulfurization waste water of coal -fired flue gas semidry method desorption fluorine chlorine Download PDF

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CN205886577U
CN205886577U CN201620855618.0U CN201620855618U CN205886577U CN 205886577 U CN205886577 U CN 205886577U CN 201620855618 U CN201620855618 U CN 201620855618U CN 205886577 U CN205886577 U CN 205886577U
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flue
desulfurization wastewater
alkali liquor
coal
gas
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杨建国
赵虹
赵敏
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to PCT/CN2017/094277 priority patent/WO2018028425A1/en
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Abstract

The utility model discloses a zero discharge system of desulfurization waste water of coal -fired flue gas semidry method desorption fluorine chlorine. The utility model discloses a high concentration alkali liquor tube way, desulfurization waste water pipeline, dilute alkali liquor tube way, alkali liquid spray make up put, compressed air pipe way, process water pipe way, flue. High concentration alkali lye and the mixture of desulfurization waste water become dilutent alkali lye, and alkali liquid spray that rethread multiinjector netization was arranged makes up and puts the flue that spouts between air preheater and the dust remover, with the abundant homogeneous mixing of flue gas, solidify gaseous major parts such as the HCl in the flue gas, HF, SO3 to the flying dust in, reduce substantially desulfurization waste water discharge, and desulfurization waste water spouts into the flue as the base solvent again, has realized the emission of desulfurization waste water zero delivery. The utility model discloses it is less to gas temperature, afterbody flue and equipment influence, still effectively reduce the tendentiousness that afterbody low temperature flue and equipment deposition corrode to promote desulfurization efficiency. The utility model has the advantages of the system is simple, the investment is little, low the showing of running cost.

Description

Coal-fired flue-gas semidry method takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal
Technical field
This utility model belongs to energy-conserving and emission-cutting technology field, and the desulfurization being related to a kind of de- fluorine and chlorine removal of coal-fired flue-gas semidry method is given up Water zero discharge system.
Background technology
The elemental composition such as sulfur, chlorine, fluorine is contained, during coal combustion, these elemental compositions can generate so in coal2、hcl、hf、so3Deng Gas, wherein hcl, hf, so3Although micro, belong to severe corrosive gas, can bring with equipment to boiler tail low temperature flue Adverse effect.Hcl, hf gas substantially can remove in wet desulfurization system completely, so cl-、f-Can be in desulfurization slurry Enrichment, the cl of excessive concentrations-、f-Desulfuration efficiency can be reduced even makes desulfurization slurry be poisoned, and current desulphurization system mainly passes through discharge Desulfurization wastewater is controlling the cl in desulfurization slurry-Concentration.
Desulfurization wastewater is not only rich in cl-、f-, also it is rich in multiple salts, so desulfurization wastewater is a kind of pollutant, therefore de- Sulfur waste water needs just can be discharged in environment through wastewater treatment.With the raising of environmental consciousness and requirement, desulfurization wastewater zero-emission Put and gradually brought into schedule, the most pollutant in desulfurization wastewater can be removed by conventional lower cost method, but It is cl-But it is difficult to simply remove because of more difficult formation precipitate, more effective technology is exactly the method using evaporation at present, no Cross its energy consumption very big, thus there is a problem of that operating cost is too high.Conventional wastewater zero discharge is equivalent to the discharge of zero pollutant water, Also there is trial to spray into desulfurization wastewater in higher temperatures flue more at present, realize the zero delivery discharge of desulfurization wastewater, the method is implemented Simply, but there is the outstanding problems such as cigarette temperature drop is bigger than normal, flue contamination is serious because injection flow rate is larger, therefore, it is difficult to effectively Implement.
Content of the invention
In order to solve the problems of desulfurization wastewater zero-emission of being related in background technology, this utility model provides one Plant the desulfurization wastewater Zero discharging system that coal-fired flue-gas semidry method takes off fluorine and chlorine removal, spray into base before coal-fired flue-gas enter cleaner unit molten Liquid, makes hcl, hf, so in flue gas3Change into solid salt together with flying dust with cleaner unit removing Deng gas, entrance is greatly decreased Hcl, hf, so of desulfurizing tower3Deng gas, and then desulfurization wastewater amount is greatly decreased, a small amount of desulfurization wastewater discharged is as alkali Substratess matter solvent, thus effectively achieve the zero delivery discharge of desulfurization wastewater.
Hcl, hf, so containing in coal-fired flue-gas3The concentration of gas is typically about tens of μ l/l concentration, and in flue gas simultaneously Also contain so having hundreds to thousands of μ l/l concentration2Gas, semidry method takes off fluorine and chlorine removal technology and there is high concentration so2With low concentration intentional , there is certain impact to technical feasibility of the present utility model in the competitive relation of removing thing.Therefore, applicant is proposing this reality Before new application, carry out mechanism Journal of Sex Research, pass through chemical kineticses simulation study respectively (soft using chemkin Part) and laboratory table simulation experiment study, show that naoh and flue gas actual concentrations combine the basic law of gas reaction: na+、cl- When mol ratio reaches 5, hcl removal efficiency is up to more than 70%, na+、cl-When mol ratio reaches 10, hcl removal efficiency approaches 100%, chemical reaction can be sufficiently complete in 0.1s.The result that two kinds of research methoies obtain is basically identical, and this practicality is described New have technical feasibility.When hcl removal efficiency reaches 70%, desulfurization wastewater flow is reduced to original 30%, now Desulfurization wastewater sprays into the impact very little to cigarette temperature in flue as base solvent.This utility model simple system, little, the naoh of investment Consuming cost be far below the operating cost of other desulfurization wastewater zero-discharge technologies.
This utility model solves the technical scheme that its technical problem is adopted:
This utility model include high concentration alkali liquid pipeline, desulfurization wastewater pipeline, dilution alkali liquor pipeline, alkali liquor atomising device, Compressed air line, technique water lines, flue.
Described high concentration alkali liquid pipeline, for conveying high-concentration alkali liquor, including high concentration alkali liquid storage tank, high-concentration alkali liquor Regulating valve, high concentration alkali flow meters.High-concentration alkali liquor is saturation or the naoh solution close to saturation or other base Solution.High-concentration alkali liquor deposits in high concentration alkali liquid storage tank after configuring, according to hcl gas in unit load (exhaust gas volumn) and flue gas Bulk concentration, by high-concentration alkali liquor governor valve control high concentration alkali flow quantity, high concentration alkali flow quantity is by high concentration alkali flow quantity Meter metering.Using naoh as base, control na+、cl-Ion mol ratio is 1~15.
Described desulfurization wastewater pipeline, for conveying desulfurization wastewater, is adjusted including desulfurization wastewater depositing reservoir, desulfurization wastewater Valve, desulfurization wastewater effusion meter.The desulfurization wastewater of desulphurization system first passes through desulfurization wastewater depositing reservoir in advance and removes most of precipitable thing, Desulfurization wastewater depositing reservoir is also used for buffering the desulfurization wastewater flow coming from desulphurization system.Desulfurization wastewater flow is generally equivalent to desulfurization System wastewater discharge, realizes desulfurization wastewater self-balancing.Under special circumstances, can using fresh water (FW) as necessary supplement or Substitute.
Described dilution alkali liquor pipeline, including alkali liquor dilution mixture device, high-pressure pump.Come from the height of high concentration alkali liquid pipeline The desulfurization wastewater of concentration alkali liquor and desulfurization wastewater pipeline uniform mixed diluting in alkali liquor dilution mixture device, the alkali liquor after dilution leads to Cross high-pressure pump and be delivered to alkali liquor atomising device.
Described alkali liquor atomising device, is arranged in the flue between air preheater and cleaner unit, will come from dilution alkali liquor The dilution alkali liquor of pipeline is atomized into droplet, and full and uniform with flue gas mix, the alkali liquor of atomization can be with the sour gas in flue gas Precursor reactant.Alkali liquor atomising device adopts pneumatic atomization, to adapt to large-scale Load Regulation.Alkali liquor atomising device adopts multiinjector Gridding is arranged, enables fogged lye in full flue section uniform fold, fogged lye and flue gas are full and uniform to be mixed to meet The demand closed.
Described compressed air line, for providing the compressed air needed for alkali liquor atomising device, and as system shutdown When shielding gas, prevent the spray nozzle clogging of alkali liquor atomising device.It is female that compressed air comes from the existing compressed air of coal unit Pipe.
Described technique water lines, access the entrance of desulfurization wastewater pipeline, for purging system pipe during system shutdown Road, prevents pipeline blockage and corrosion.Under special circumstances, can supplement or substitute desulfurization wastewater it is ensured that system stable operation.Work Skill water comes from coal unit existing fresh water (FW) main pipe.
Described flue is the existing back-end ductwork of coal unit, and it is existing empty pre- that the equipment in flue includes coal unit Device, cleaner unit, desulphurization system.
The beneficial effects of the utility model are:
A small amount of base soln spray into cleaner unit before flue gas in, by hcl, hf, so in flue gas3It is cured in flying dust, Desulfurization wastewater flow is greatly decreased, desulfurization wastewater again the solvent as base substance it is achieved that desulfurization wastewater is interior in flue follows Ring, it is achieved thereby that the discharge of desulfurization wastewater zero delivery.This utility model affects less, to back-end ductwork and equipment on flue-gas temperature Safety and economic operation impact is less, simultaneously because hcl, hf, so in flue gas3It is removed Deng gas, also can effectively reduce afterbody Low temperature flue and the tendentiousness of equipment ash deposits corrosion, and lift desulfuration efficiency.This utility model have simple system, investment little, The low remarkable advantage of operating cost.
Brief description
Fig. 1 is system schematic.
In figure, 1, high concentration alkali liquid pipeline;1-1, high concentration alkali liquid storage tank;1-2, high-concentration alkali liquor regulating valve;1-3, height Concentration alkaline stream gauge;2nd, desulfurization wastewater pipeline;2-1, desulfurization wastewater depositing reservoir;2-2, desulfurization wastewater regulating valve;2-3, desulfurization Waste water stream gauge;3rd, dilute alkali liquor pipeline;3-1, alkali liquor dilution mixture device;3-2, high-pressure pump;4th, alkali liquor atomising device;5th, compress Air pipe line;5-1, compressed air main pipe;6th, technique water lines;6-1, fresh water (FW) main pipe;7th, flue;7-1, air preheater;7-2、 Cleaner unit;7-3, desulphurization system.
Specific embodiment
Below in conjunction with accompanying drawing, this utility model is further described.
As shown in figure 1, a kind of coal-fired flue-gas semidry method takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal, including high concentration alkali Liquid pipeline 1, desulfurization wastewater pipeline 2, dilution alkali liquor pipeline 3, alkali liquor atomising device 4, compressed air line 5, technique water lines 6, Flue 7.
Described high concentration alkali liquid pipeline 1, including high concentration alkali liquid storage tank 1-1, high-concentration alkali liquor regulating valve 1-2, highly concentrated Degree alkaline stream gauge 1-3.
Described desulfurization wastewater pipeline 2, including desulfurization wastewater depositing reservoir 2-1, desulfurization wastewater regulating valve 2-2, desulfurization wastewater Effusion meter 2-3.
Described dilution alkali liquor pipeline 3, including alkali liquor dilution mixture device 3-1, high-pressure pump 3-2.
Described compressed air line 5, compressed air comes from coal unit existing compressed air main pipe 5-1.
Described technique water lines 6, fresh water (FW) comes from coal unit existing fresh water (FW) main pipe 6-1.
Described flue 7 is the existing back-end ductwork of coal unit, and the equipment in flue includes the existing sky of coal unit Pre- device 7-1, cleaner unit 7-2, desulphurization system 7-3.
Described high concentration alkali liquid pipeline 1, for conveying high-concentration alkali liquor, high-concentration alkali liquor is for saturation or close to saturation Naoh solution or other base soln.High-concentration alkali liquor deposits in high concentration alkali liquid storage tank 1-1 after configuring, according to Hcl gas concentration in unit load (exhaust gas volumn) and flue gas, controls high concentration alkali liquor stream by high-concentration alkali liquor regulating valve 1-2 Amount, high concentration alkali flow quantity is measured by high concentration alkali flow meters 1-3.Using naoh as base, control na+、cl-Ion rubs That ratio is 1~15.
Described desulfurization wastewater pipeline 2, for conveying desulfurization wastewater, the desulfurization wastewater of desulphurization system first passes through desulfurization in advance and gives up Clarification of water pond 2-1 removes most of precipitable thing, and desulfurization wastewater depositing reservoir 2-1 is also used for buffering and comes from desulphurization system 7-3 Desulfurization wastewater flow.Desulfurization wastewater flow is generally equivalent to desulphurization system wastewater discharge, realizes desulfurization wastewater self-balancing.Special In the case of, can be using fresh water (FW) as necessary supplement or replacement.
Described dilution alkali liquor pipeline 3, comes from high-concentration alkali liquor and the desulfurization wastewater pipeline 2 of high concentration alkali liquid pipeline 1 Desulfurization wastewater in alkali liquor dilution mixture device 3-1 uniform mixed diluting, the alkali liquor after dilution is delivered to alkali by high-pressure pump 3-2 Liquid mist gasifying device 4.
Described alkali liquor atomising device 4, is arranged in the flue 7 between air preheater 7-1 and cleaner unit 7-2, will come from The dilution alkali liquor of dilution alkali liquor pipeline 3 is atomized into droplet, and full and uniform with flue gas mix, the alkali liquor of atomization can with flue gas in Sour gas reaction.Alkali liquor atomising device 4 adopts pneumatic atomization, to adapt to large-scale Load Regulation.Alkali liquor atomising device 4 Using multiinjector gridding arrangement, enable fogged lye in full flue section uniform fold, to meet fogged lye and flue gas The demand of full and uniform mixing.
Described compressed air line 5, for providing the compressed air needed for alkali liquor atomising device 4, and stops as system Shielding gas during fortune, prevents the spray nozzle clogging of alkali liquor atomising device 4.
Described technique water lines 6, access the entrance of desulfurization wastewater pipeline 2, for purging system during system shutdown Pipeline, prevents pipeline blockage and corrosion.Under special circumstances, can supplement or substitute desulfurization wastewater it is ensured that system stable operation.

Claims (7)

1. coal-fired flue-gas semidry method takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal it is characterised in that including high concentration alkali liquid pipe Road, desulfurization wastewater pipeline, dilution alkali liquor pipeline, alkali liquor atomising device, compressed air line, technique water lines, flue;
Described high concentration alkali liquid pipeline, for conveying high-concentration alkali liquor, is adjusted including high concentration alkali liquid storage tank, high-concentration alkali liquor Valve, high concentration alkali flow meters;High-concentration alkali liquor deposits in high concentration alkali liquid storage tank after configuring, and is adjusted by high-concentration alkali liquor Valve controls high concentration alkali flow quantity, and high concentration alkali flow quantity is measured by high concentration alkali flow meters;
Described desulfurization wastewater pipeline, for conveying desulfurization wastewater, including desulfurization wastewater depositing reservoir, desulfurization wastewater regulating valve, takes off Sulfur waste water stream gauge;Desulfurization wastewater first passes through desulfurization wastewater depositing reservoir in advance and removes most of precipitable thing, desulfurization wastewater depositing reservoir It is also used for buffering desulfurization wastewater flow;
Described alkali liquor atomising device, is arranged in the flue between air preheater and cleaner unit, will come from dilution alkali liquor pipeline Dilution alkali liquor be atomized into droplet, and full and uniform with flue gas mix, the alkali liquor of atomization can be anti-with the sour gas in flue gas Should;
Described compressed air line, for providing the compressed air needed for alkali liquor atomising device, and as during system shutdown Shielding gas, prevents the spray nozzle clogging of alkali liquor atomising device;
Described technique water lines, access the entrance of desulfurization wastewater pipeline, for purging system pipeline during system shutdown, prevent Only pipeline blockage and corrosion;
Described flue is the existing back-end ductwork of coal unit, the equipment in flue include the existing air preheater of coal unit, Cleaner unit, desulphurization system.
2. coal-fired flue-gas semidry method according to claim 1 takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal, and its feature exists It is saturation or the base soln close to saturation in described high-concentration alkali liquor.
3. coal-fired flue-gas semidry method according to claim 2 takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal, and its feature exists It is naoh solution in described high-concentration alkali liquor.
4. coal-fired flue-gas semidry method according to claim 3 takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal, and its feature exists As base, control na in using naoh+、cl-Ion mol ratio is 1~15.
5. coal-fired flue-gas semidry method according to claim 1 takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal, and its feature exists Adopt pneumatic atomization in alkali liquor atomising device, to adapt to large-scale Load Regulation;Alkali liquor atomising device adopts multiinjector grid Change arrangement, enable fogged lye in full flue section uniform fold, fogged lye and flue gas are full and uniform to be mixed to meet Demand.
6. coal-fired flue-gas semidry method according to claim 1 takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal, and its feature exists Come from coal unit existing compressed air main pipe in compressed air.
7. coal-fired flue-gas semidry method according to claim 1 takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal, and its feature exists Come from coal unit existing fresh water (FW) main pipe in fresh water (FW).
CN201620855618.0U 2016-08-08 2016-08-08 Zero discharge system of desulfurization waste water of coal -fired flue gas semidry method desorption fluorine chlorine Active CN205886577U (en)

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CN201620855618.0U CN205886577U (en) 2016-08-08 2016-08-08 Zero discharge system of desulfurization waste water of coal -fired flue gas semidry method desorption fluorine chlorine
PCT/CN2017/094277 WO2018028425A1 (en) 2016-08-08 2017-07-25 Desulphurization wastewater zero-discharge system for removing fluorine and chlorine from coal-fired flue gas by semi-dry process

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106076100A (en) * 2016-08-08 2016-11-09 浙江大学 A kind of coal-fired flue-gas semidry method takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal
WO2018028425A1 (en) * 2016-08-08 2018-02-15 浙江大学 Desulphurization wastewater zero-discharge system for removing fluorine and chlorine from coal-fired flue gas by semi-dry process
CN115318074A (en) * 2022-07-15 2022-11-11 西藏宏聚达环境技术有限公司 Flue gas quenching and semidry deacidification integrated reaction system and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106076100A (en) * 2016-08-08 2016-11-09 浙江大学 A kind of coal-fired flue-gas semidry method takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal
WO2018028425A1 (en) * 2016-08-08 2018-02-15 浙江大学 Desulphurization wastewater zero-discharge system for removing fluorine and chlorine from coal-fired flue gas by semi-dry process
CN115318074A (en) * 2022-07-15 2022-11-11 西藏宏聚达环境技术有限公司 Flue gas quenching and semidry deacidification integrated reaction system and method

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