CN107055900A - A kind of desulfurization wastewater treatment system and method - Google Patents
A kind of desulfurization wastewater treatment system and method Download PDFInfo
- Publication number
- CN107055900A CN107055900A CN201710134334.1A CN201710134334A CN107055900A CN 107055900 A CN107055900 A CN 107055900A CN 201710134334 A CN201710134334 A CN 201710134334A CN 107055900 A CN107055900 A CN 107055900A
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- CN
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- Prior art keywords
- flue
- heat exchanger
- desulfurization wastewater
- waste water
- wastewater
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 50
- 230000023556 desulfurization Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 104
- 239000000428 dust Substances 0.000 claims abstract description 35
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 34
- 238000005054 agglomeration Methods 0.000 claims abstract description 29
- 230000002776 aggregation Effects 0.000 claims abstract description 29
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 26
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 10
- 230000008020 evaporation Effects 0.000 claims abstract description 10
- 150000001805 chlorine compounds Chemical class 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 239000010865 sewage Substances 0.000 claims description 25
- 239000010802 sludge Substances 0.000 claims description 21
- 238000004062 sedimentation Methods 0.000 claims description 20
- 238000009835 boiling Methods 0.000 claims description 16
- 238000005189 flocculation Methods 0.000 claims description 16
- 230000016615 flocculation Effects 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 230000018044 dehydration Effects 0.000 claims description 12
- 238000006297 dehydration reaction Methods 0.000 claims description 12
- 230000003009 desulfurizing effect Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 239000006228 supernatant Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 238000005352 clarification Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000000889 atomisation Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 239000003500 flue dust Substances 0.000 claims description 2
- 235000019504 cigarettes Nutrition 0.000 claims 2
- 230000008569 process Effects 0.000 abstract description 12
- 239000002699 waste material Substances 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 4
- RCTYPNKXASFOBE-UHFFFAOYSA-M chloromercury Chemical compound [Hg]Cl RCTYPNKXASFOBE-UHFFFAOYSA-M 0.000 abstract description 3
- 239000003517 fume Substances 0.000 abstract description 3
- BQPIGGFYSBELGY-UHFFFAOYSA-N mercury(2+) Chemical compound [Hg+2] BQPIGGFYSBELGY-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 description 9
- 239000004411 aluminium Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 229920001285 xanthan gum Polymers 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 241000370738 Chlorion Species 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- 230000035800 maturation Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 235000010413 sodium alginate Nutrition 0.000 description 2
- 229940005550 sodium alginate Drugs 0.000 description 2
- 239000000661 sodium alginate Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention belongs to wastewater desulfurized by fume wet processing technology field, it is related to a kind of desulfurization wastewater treatment system and method, gas approach between boiler and electrostatic precipitator sprays into the desulfurization wastewater for being mixed with dust agglomeration aid of certain temperature and pressure, make desulfurization wastewater vacuum flashing in gas approach of heat using the lower pressure of gas approach, dust agglomerator promotes PM2.5 particle agglomerations in flue gas after waste water evaporation, makes the increase of its particle diameter be easy to follow-up electrostatic precipitator capture to collect；Secondly, a large amount of chlorides in waste water can react with bivalent mercury, form mercury chloride and captured with dust in flue gas by deduster, so as to remove bivalent mercury in flue gas.The present invention utilizes existing flue, by being heated to the desulfurization wastewater for being mixed with dust agglomeration aid, is then squeezed into pump in flue sprayer unit, desulfurization wastewater is set all to be evaporated in low pressure flue, reach wastewater zero discharge, and can be in cooperation-removal flue gas PM2.5 and mercury ion, realize the treatment of wastes with processes of wastes against one another.
Description
Technical field
The invention belongs to wastewater desulfurized by fume wet processing technology field, more particularly to one kind can cooperation-removal PM2.5 and
The desulfurization wastewater treatment system of dimercurion.
Background technology
Wet Flue Gas Desulfurization Technique is widely used flue gas desulfurization technique at present, the technology has that desulfuration efficiency is high, system into
Ripe stable the advantages of.However, Wet FGD can produce substantial amounts of waste water in the process of running, the waste water is in faintly acid
And containing substantial amounts of chlorion, fluorine ion, heavy metal ion, suspension and other impurities, with certain corrosivity, if not
Can effectively handle can cause water resource waste and environmental pollution.Therefore, it is necessary to carry out scientific disposal to desulfurization wastewater.
Waste water treatment process widely used at present mainly has chemical settling handling process, flue Direct spraying evaporator man
Skill, evaporative crystallization technique etc..Chemical settling handling process is current wet desulphurization sector application most wide waste water treatment process.Should
The capital equipment of technique is three headers, and general processing method is that nertralizer, flocculant and flocculation aid are added into desulfurization wastewater,
And be constantly aerated, the impurity such as heavy metal, suspension flocculating setting from waste water is got off, be finally reached the discharge mark of country's permission
It is accurate.The technique needs to use a large amount of chemical assistants in operation, and operational outfit floor space is big, and energy consumption is big.Flue is direct
Spray evaporation technique is a kind of emerging technique, and its specific method is that waste water is directly atomized to the flue sprayed into before electrostatic precipitator
It is interior, evaporate waste water using the high-temperature flue gas in flue, the crystallization dust produced after waste water evaporation is captured by electrostatic precipitator, most
Wastewater zero discharge is realized eventually.But the use condition of this method is very harsh, it is necessary to which droplet has enough times of contact with flue gas, put down
Straight flue, fine atomization and straying quatity.And the flowing of actual flue gas in flue is not often uneven, smooth, according to this work
The problems such as skill will produce not thorough evaporation, corrosion flue.Evaporative crystallization technique is a kind of technique of more maturation, and its method is
Desulfurization wastewater is heated, water vapour after its evaporative crystallization, evaporation is condensed reuse, the crystallization salt of generation is collected storage.Should
Technique has the advantages that wastewater zero discharge, waste water recoverable, technology maturation, but its energy consumption is huge, and operating cost is high.
The content of the invention
For the problem above of prior art, the invention provides a kind of desulfurization wastewater treatment system and method, the system
Do not increase existing flue resistance, be pumped into after the desulfurization wastewater for being mixed with dust agglomeration aid is heated between boiler and electrostatic precipitator
Flue sprayer unit in, using the low relative pressure of flue make waste water all vaporization, realize wastewater zero discharge and can cooperate with de-
Except the PM2.5 and bivalent mercury in flue gas, the treatment of wastes with processes of wastes against one another is reached.
In order to solve the above-mentioned technical problem, present invention employs following technical proposals.
A kind of desulfurization wastewater treatment system, including boiler, electrostatic precipitator, desulfurizing tower, hydrocyclone, sedimentation clarification dress
Put, sludge dehydration device, sewage collecting box, heat exchanger, sweet-water tank, flue sprayer unit, boiler flue connection electrostatic remove
The air inlet of dirt device, the gas outlet of electrostatic precipitator connects the air inlet of desulfurizing tower, the desulfurization slurry outlet connection water of desulfurizing tower
Power cyclone, the supernatant effluent outlet connection sedimentation clarifier of hydrocyclone, the slurry outlet of sedimentation clarifier connects
Connect sludge pump, sludge pump connection sludge dehydration device, the wastewater outlet connection sewage collecting box of sludge dehydration device, sedimentation clarification
The supernatant effluent outlet connection sewage collecting box of device, sewage collecting box is connected the water inlet of heat exchanger by waste water pump, changed
The water inlet of hot device is also connected with sweet-water tank, and the delivery port connection of vapor heat exchanger is arranged on the flue spraying dress in boiler flue
Put.
Preferably, flocculation aid chemicals dosing plant is installed on sedimentation clarifier, convenient addition flocculation aid.
Preferably, dust agglomeration aid chemicals dosing plant is installed on sewage collecting box, convenient addition dust agglomeration aid.
Preferably, the heat exchanger is vapor heat exchanger.
Preferably, the steam inlet duct of vapor heat exchanger is provided with wastewater outlet temperature in regulating valve, vapor heat exchanger
Interlocked with steam inlet duct regulating valve, realize wastewater outlet temperature automatic control.
Preferably, the flue sprayer unit in flue is two sets, and the using and the reserved, a set of work, a set of during normal operation
Cleaning is standby, and work and cleaning can be carried out simultaneously.It is two sets for the vapor heat exchanger that waste water is heated, the using and the reserved, normal fortune
A set of work when turning, a set of cleaning is standby, and work and cleaning can be carried out simultaneously.Two sets of flue sprayer units connect a set of steaming respectively
Vapour heat exchanger, the water inlet of two sets of vapor heat exchangers is all connected with sweet-water tank and sewage collecting box.
A kind of method for treating desulfurized wastewater, based on foregoing desulfurization wastewater treatment system, first adds into desulfurization wastewater and helps
Solidifying agent, dust agglomeration aid is mixed into after sedimentation clarification, heat exchanger heating is pumped into by pump after being well mixed, by nozzle atomization after heating
Spray into the flue before electrostatic precipitator, thermal wastewater all evaporates in low pressure flue, a large amount of chlorides and flue gas in waste water
Bivalent mercury is sloughed in middle bivalent mercury reaction, and dust agglomeration aid makes a large amount of PM2.5 reunite change greatly, is easy to follow-up electrostatic precipitator to catch
Obtain, the pollutant dust that the evaporation of remaining waste water is produced is collected with exhaust gas dust by electrostatic precipitator.
Preferably, the waste water in sewage collecting box, which need to add a certain amount of flocculation aid, removes oil removal, it is follow-up to reduce
The addition of dust agglomeration aid.
Preferably, described flocculation aid, which is water process, often uses flocculation aid, dust agglomeration aid can use disclosed patent
In single agglomerator, such as xanthans, aluminium polychloride, bodied ferric sulfate；Or mixing agglomerator, such as xanthans is with polymerizeing chlorine
Change aluminium, aluminium polychloride and sodium alginate etc..
Preferably, wastewater outlet temperature is more than boiling point of the waste water under flue pressure, and wastewater outlet temperature in heat exchanger
Degree is higher, and liquid-drop diameter is smaller after waste water is vaporized in flue.
Preferably, demineralized water leaving water temperature is greater than boiling point of the demineralized water under flue pressure, and desalination in heat exchanger
Water outlet temperature is higher, and liquid-drop diameter is smaller after demineralized water is vaporized in flue.
Preferably, the loine pressure that desulfurization wastewater heating sprays into flue should make waste water much larger than flue gas pressures in flue
Liquid is still kept not vaporize in boiling point under being heated above flue pressure.
Preferably, the loine pressure that demineralized water heating sprays into flue should make waste water exist much larger than flue gas pressures in flue
Still liquid is kept not vaporize when being heated above boiling point under flue pressure.
What gas approach of the present invention between boiler and electrostatic precipitator sprayed into certain temperature and pressure is mixed with dust group
The desulfurization wastewater of poly- auxiliary agent, the temperature is higher than boiling point of the waste water under flue gas pressure, and the pressure is higher than flue gas pressure.
Make desulfurization wastewater vacuum flashing in gas approach of heat, dust agglomerator after waste water evaporation using the lower pressure of gas approach
Promote PM2.5 particle agglomerations in flue gas, make the increase of its particle diameter be easy to follow-up electrostatic precipitator capture to collect；Secondly, in waste water
A large amount of chlorides can react with bivalent mercury, form mercury chloride and captured with dust in flue gas by deduster, so as to remove in flue gas
Bivalent mercury.
Desulfurization wastewater is directly sprayed into flue using fume afterheat evaporation desulfurization and only to flue instant invention overcomes traditional
Spray into single waste water and without the deficiency of dust agglomeration aid, to the strong adaptability of flue, spray desulfurization wastewater in flue
All vaporizations, do not reduce flue-gas temperature, and waste water straying quatity is big, require low to flue sprayer unit, easy to operate.
At the same time, the addition of dust agglomeration aid can make desulfurization wastewater in auxiliary removing flue gas during being processed
Chloride in PM2.5, desulfurization wastewater can remove the bivalent mercury in flue gas, improve the overall demercuration rate of desulphurization system.This hair
It is bright desulfurization wastewater control is achieved many things at one stroke.
Brief description of the drawings
Fig. 1 is a kind of flow chart of desulfurization wastewater treatment system of the invention.
Fig. 2 is the boiling point of pure water at various pressures.
In figure：1. the hydrocyclone 5. of 2. electrostatic precipitator of boiler, 3. desulfurizing tower 4. sedimentation clarifier 6. helps solidifying
The dust agglomeration aid chemicals dosing plant 11. of 9. sewage collecting box of agent chemicals dosing plant 7. sludge pump, 8. sludge dehydration device 10. gives up
The flue sprayer unit of 12. vapor heat exchanger of water pump, 13. sweet-water tank 14..
Embodiment
The present invention is furture elucidated below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of desulfurization wastewater treatment system, including boiler 1, electrostatic precipitator 2, desulfurizing tower 3, hydraulic cyclone
Device 4, sedimentation clarifier 5, sludge dehydration device 8, sewage collecting box 9, vapor heat exchanger 12, sweet-water tank 13, flue spraying
Device 14.The flue of boiler 1 connects the air inlet of electrostatic precipitator 2, and the gas outlet of electrostatic precipitator 2 connects entering for desulfurizing tower 3
Gas port, the desulfurization slurry outlet connection hydrocyclone 4 of desulfurizing tower 3, the supernatant effluent outlet connection sedimentation of hydrocyclone 4
Clarifier 5, the slurry outlet connection sludge pump 7 of sedimentation clarifier 5, the connection sludge dehydration device 8 of sludge pump 7, sludge takes off
The wastewater outlet connection sewage collecting box 9 of water installations 8, the supernatant effluent outlet connection sewage collecting box of sedimentation clarifier 5
9, sewage collecting box 9 connects the water inlet of vapor heat exchanger 12 by waste water pump 11, and the water inlet of vapor heat exchanger 12 is also connected with
Sweet-water tank 13, the delivery port connection of vapor heat exchanger 12 is arranged on the flue sprayer unit 14 in boiler flue.
Vapor heat exchanger 12 can also be replaced with other heat exchangers, and the steam inlet duct of vapor heat exchanger 12 is provided with regulation
Wastewater outlet temperature is interlocked with steam inlet duct regulating valve in valve, vapor heat exchanger 12, realizes that wastewater outlet temperature is controlled automatically
System.
Flocculation aid chemicals dosing plant, convenient addition flocculation aid are installed on sedimentation clarifier 5.Installed on sewage collecting box 9
There are dust agglomeration aid chemicals dosing plant 10, convenient addition dust agglomeration aid.
Flue sprayer unit 14 in flue is two sets, and the using and the reserved, a set of work during normal operation, a set of cleaning is standby
With simultaneously work and cleaning can be carried out.It is two sets, the using and the reserved, during normal operation for the vapor heat exchanger 12 that waste water is heated
A set of work, a set of cleaning is standby, and work and cleaning can be carried out simultaneously.Two sets of flue sprayer units 14 connect a set of steam respectively
Heat exchanger 12, the water inlet of two sets of vapor heat exchangers 12 is all connected with sweet-water tank 13 and sewage collecting box 9.
The underflow liquid outlet auxiliary connection product dehydrate system of hydrocyclone 4.
A kind of method for treating desulfurized wastewater, it is first added based on foregoing desulfurization wastewater treatment system into desulfurization wastewater
Flocculation aid, dust agglomeration aid is mixed into after sedimentation clarification, it is well mixed after vapor heat exchanger 12 be pumped into by pump heated, after heating by
Flue sprayer unit 14 is sprayed into the flue before electrostatic precipitator 2, and thermal wastewater all evaporates in low pressure flue, big in waste water
Amount chloride sloughs bivalent mercury with bivalent mercury reaction in flue gas, and dust agglomeration aid makes a large amount of PM2.5 reunions become big, is easy to follow-up
Electrostatic precipitator 2 is captured, and the pollutant dust that the evaporation of remaining waste water is produced is collected with exhaust gas dust by electrostatic precipitator 2.
Waste water in sewage collecting box 9 need to add a certain amount of flocculation aid and remove oil removal, be reunited with reducing follow-up dust
The addition of auxiliary agent.Described flocculation aid is that water process often uses flocculation aid, and dust agglomeration aid can be used in disclosed patent
Single agglomerator, such as xanthans, aluminium polychloride, bodied ferric sulfate；Or mixing agglomerator, such as xanthans and polyaluminium
Aluminium, aluminium polychloride and sodium alginate etc..
Wastewater outlet temperature is more than boiling point of the waste water under flue pressure, and wastewater outlet temperature in the vapor heat exchanger 12
Degree is higher, and liquid-drop diameter is smaller after waste water is vaporized in flue.Demineralized water leaving water temperature is greater than in the vapor heat exchanger 12
Boiling point of the demineralized water under flue pressure, and desalination water outlet temperature is higher, liquid-drop diameter is got over after demineralized water is vaporized in flue
It is small.
The loine pressure that desulfurization wastewater heating sprays into flue should make waste water paramount in heating much larger than flue gas pressures in flue
Liquid is still kept not gasify when boiling point under flue pressure.The loine pressure that the demineralized water heating sprays into flue should be much larger than
Flue gas pressures in flue, make waste water still keep liquid not gasify in boiling point under being heated above flue pressure.
Detailed process is：The desulfurization slurry produced first after the cleaning of desulfurizing tower 3 flue gas is separated through hydrocyclone 4 to be concentrated
Afterwards, bottom underflow liquid removes byproduct dewatering system, and supernatant effluent enters sedimentation clarifier 5, passes through flocculation aid chemicals dosing plant 6
Flocculation aid is added into sedimentation depositing reservoir, most suspended substances in desulfurization wastewater is settled down, the mud settled down is through dirt
Dredge pump 7 squeezes into supernatant effluent in sludge dehydration device 8, sedimentation clarifier 5 and enters sewage collecting box 9, sludge dehydration device 8
The waste water of abjection also enters sewage collecting box 9, and the solid-state waste sludge that sludge dehydration device 8 is deviate from presses fixed-end forces.Pass through dust
Agglomeration aid chemicals dosing plant 10 adds agglomeration aid into sewage collecting box 9, and well mixed rear waste water (is pumped out by waste water pump 11
Mouth pressure should make wastewater pressure be higher than in pipeline pressure under thermal wastewater boiling point in the case where meeting pressure loss in piping, refer to Fig. 2 pure
The boiling point of water at various pressures chooses pump discharge pressure) it is pumped into vapor heat exchanger 12, the mixing of waste water and agglomeration aid is molten
After liquid is heated through steam (temperature can rise to 125 degrees centigrades), into flue sprayer unit 14.Waste water mixed solution is through flue
The atomization decompression moisture of sprayer unit 14 is all evaporated, and the flue gas that impurities are produced with dust form with boiler 1 is removed into electrostatic
Dirt device 2 is simultaneously captured, and the agglomeration aid in waste water mixed solution can promote PM2.5 agglomerations in flue gas, be easy to by electrostatic
Deduster 2 is collected.At the same time, the bivalent mercury reaction in the chlorion and flue gas in waste water, generates mercury chloride, with powder in flue gas
Dirt enters electrostatic precipitator 2 and is captured.Finally realize PM2.5 and divalence in desulfurization wastewater zero-emission and cooperation-removal flue gas
Mercury, the treatment of wastes with processes of wastes against one another.Vapor heat exchanger 12 and flue sprayer unit 14 have two sets, normal a set of work, other set by using
Sweet-water tank 13 injects demineralized water into vapor heat exchanger 12, and decompression vaporization is sprayed with flue sprayer unit after heating, and washing is steamed
Vapour heat exchanger 12, flue sprayer unit 14 and its between pipeline, prevention pipeline and equipment scaling.The two can be carried out simultaneously,
When wastewater flow rate is larger, two sets of flue sprayer units 14 are also simultaneously operable.
The present invention utilizes existing flue, by being heated to the desulfurization wastewater for being mixed with dust agglomeration aid, is then squeezed into pump
In flue sprayer unit, desulfurization wastewater is all evaporated in low pressure flue, reach wastewater zero discharge, and can cooperation-removal flue gas
In PM2.5 and mercury ion, realize the treatment of wastes with processes of wastes against one another.
Claims (10)
1. a kind of desulfurization wastewater treatment system, including boiler, electrostatic precipitator, desulfurizing tower, hydrocyclone, sedimentation clarification dress
Put, sludge dehydration device, sewage collecting box, heat exchanger, sweet-water tank, flue sprayer unit, it is characterized in that：The flue of boiler connects
The air inlet of electrostatic precipitator is connect, the gas outlet of electrostatic precipitator connects the air inlet of desulfurizing tower, and the desulfurization slurry of desulfurizing tower goes out
Mouth connection hydrocyclone, the supernatant effluent outlet connection sedimentation clarifier of hydrocyclone, settles the mud of clarifier
Slurry outlet connection sludge pump, sludge pump connection sludge dehydration device, the wastewater outlet connection sewage collecting box of sludge dehydration device,
The supernatant effluent outlet connection sewage collecting box of clarifier is settled, sewage collecting box connects entering for heat exchanger by waste water pump
The mouth of a river, the water inlet of heat exchanger is also connected with sweet-water tank, and the delivery port connection of vapor heat exchanger is arranged on the cigarette in boiler flue
Road sprayer unit.
2. a kind of desulfurization wastewater treatment system according to claim 1, it is characterized in that：Install and help on sedimentation clarifier
Solidifying agent chemicals dosing plant.
3. a kind of desulfurization wastewater treatment system according to claim 1, it is characterized in that：Dust is installed on sewage collecting box
Agglomeration aid chemicals dosing plant.
4. a kind of desulfurization wastewater treatment system according to claim 1, it is characterized in that：The heat exchanger is steam heat-exchanging
Device.
5. a kind of desulfurization wastewater treatment system according to claim 4, it is characterized in that：The steam inlet tube of vapor heat exchanger
Road is provided with wastewater outlet temperature in regulating valve, vapor heat exchanger and interlocked with steam inlet duct regulating valve.
6. a kind of desulfurization wastewater treatment system according to claim 4, it is characterized in that：Flue sprayer unit in flue is
Two sets, vapor heat exchanger is two sets, and two sets of flue sprayer units connect a set of vapor heat exchanger respectively, two sets of vapor heat exchangers
Water inlet is all connected with sweet-water tank and sewage collecting box.
7. a kind of method for treating desulfurized wastewater, it is characterized in that：Based on the desulfurization wastewater treatment system described in claim 1, first to
Flocculation aid is added in desulfurization wastewater, dust agglomeration aid is mixed into after sedimentation clarification, heat exchanger heating is pumped into by pump after being well mixed,
Sprayed into after heating by nozzle atomization in the flue before electrostatic precipitator, thermal wastewater all evaporates in low pressure flue, in waste water
A large amount of chlorides slough bivalent mercury with bivalent mercury reaction in flue gas, and dust agglomeration aid makes a large amount of PM2.5 reunions become big, after being easy to
Continuous electrostatic precipitator capture, the pollutant dust that the evaporation of remaining waste water is produced is collected with exhaust gas dust by electrostatic precipitator.
8. a kind of method for treating desulfurized wastewater according to claim 7, it is characterized in that：Waste water addition in sewage collecting box
A certain amount of flocculation aid removes oil removal, to reduce the addition of follow-up dust agglomeration aid.
9. a kind of method for treating desulfurized wastewater according to claim 7, it is characterized in that：Wastewater outlet temperature is big in heat exchanger
Demineralized water leaving water temperature is more than boiling point of the demineralized water under flue pressure in boiling point of the waste water under flue pressure, heat exchanger.
10. a kind of method for treating desulfurized wastewater according to claim 7, it is characterized in that：Desulfurization wastewater heating sprays into flue
Loine pressure should be greater than flue gas pressures in flue, waste water is still kept liquid in boiling point under being heated above flue pressure
Do not vaporize；The loine pressure that demineralized water heating sprays into flue should be greater than flue gas pressures in flue, waste water is being heated above cigarette
Still liquid is kept not vaporize during boiling point under road pressure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592065A (en) * | 2020-05-29 | 2020-08-28 | 亿川科技(成都)有限责任公司 | Coal-fired boiler double-flue wastewater zero-discharge treatment process |
| CN114292673A (en) * | 2021-12-29 | 2022-04-08 | 北京北科环境工程有限公司 | Blast furnace gas wet pervaporation dechlorination method and dechlorination device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100752327B1 (en) * | 2006-09-12 | 2007-08-27 | 재단법인 포항산업과학연구원 | Removal method of mercury contained in emission gas from incinerator by blast furnace slag and apparatus of the same |
| CN102380278A (en) * | 2011-09-22 | 2012-03-21 | 东南大学 | Method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in evaporation manner and device of method |
| CN105126561A (en) * | 2015-08-04 | 2015-12-09 | 东南大学 | Coal-fired flue gas PM2.5/SO3/Hg combined removing method based on desulfurization wastewater evaporation treatment |
| CN205590492U (en) * | 2016-04-14 | 2016-09-21 | 大唐环境产业集团股份有限公司 | Device of multistage evaporating treatment desulfurization waste water of flue |
| CN106039911A (en) * | 2016-07-29 | 2016-10-26 | 中国神华能源股份有限公司 | Equipment and method for flue gas treatment |
| CN106115826A (en) * | 2016-08-19 | 2016-11-16 | 斯普瑞喷雾***(上海)有限公司 | The method and apparatus that wet desulphurization waste water processes |
| CN206654811U (en) * | 2017-02-27 | 2017-11-21 | 上海明净环保科技有限公司 | A kind of desulfurization wastewater treatment system |
-
2017
- 2017-02-27 CN CN201710134334.1A patent/CN107055900A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100752327B1 (en) * | 2006-09-12 | 2007-08-27 | 재단법인 포항산업과학연구원 | Removal method of mercury contained in emission gas from incinerator by blast furnace slag and apparatus of the same |
| CN102380278A (en) * | 2011-09-22 | 2012-03-21 | 东南大学 | Method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in evaporation manner and device of method |
| CN105126561A (en) * | 2015-08-04 | 2015-12-09 | 东南大学 | Coal-fired flue gas PM2.5/SO3/Hg combined removing method based on desulfurization wastewater evaporation treatment |
| CN205590492U (en) * | 2016-04-14 | 2016-09-21 | 大唐环境产业集团股份有限公司 | Device of multistage evaporating treatment desulfurization waste water of flue |
| CN106039911A (en) * | 2016-07-29 | 2016-10-26 | 中国神华能源股份有限公司 | Equipment and method for flue gas treatment |
| CN106115826A (en) * | 2016-08-19 | 2016-11-16 | 斯普瑞喷雾***(上海)有限公司 | The method and apparatus that wet desulphurization waste water processes |
| CN206654811U (en) * | 2017-02-27 | 2017-11-21 | 上海明净环保科技有限公司 | A kind of desulfurization wastewater treatment system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592065A (en) * | 2020-05-29 | 2020-08-28 | 亿川科技(成都)有限责任公司 | Coal-fired boiler double-flue wastewater zero-discharge treatment process |
| CN114292673A (en) * | 2021-12-29 | 2022-04-08 | 北京北科环境工程有限公司 | Blast furnace gas wet pervaporation dechlorination method and dechlorination device |
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