CN105060545A - System and method for softening treatment of desulfurization wastewater of coal-fired power plant - Google Patents
System and method for softening treatment of desulfurization wastewater of coal-fired power plant Download PDFInfo
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- CN105060545A CN105060545A CN201510424135.5A CN201510424135A CN105060545A CN 105060545 A CN105060545 A CN 105060545A CN 201510424135 A CN201510424135 A CN 201510424135A CN 105060545 A CN105060545 A CN 105060545A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 46
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 34
- 230000023556 desulfurization Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 127
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 26
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 25
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 25
- 238000005352 clarification Methods 0.000 claims abstract description 21
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 18
- 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 claims abstract description 11
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 8
- 239000004571 lime Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 80
- 239000010802 sludge Substances 0.000 claims description 29
- 239000010908 plant waste Substances 0.000 claims description 22
- 239000003546 flue gas Substances 0.000 claims description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 18
- 238000002425 crystallisation Methods 0.000 claims description 12
- 230000008025 crystallization Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 9
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 8
- 210000000481 breast Anatomy 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 5
- 238000000247 postprecipitation Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 abstract description 3
- 235000013336 milk Nutrition 0.000 abstract description 3
- 239000008267 milk Substances 0.000 abstract description 3
- 210000004080 milk Anatomy 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000010517 secondary reaction Methods 0.000 abstract 4
- 229910052925 anhydrite Inorganic materials 0.000 abstract 1
- 235000010216 calcium carbonate Nutrition 0.000 abstract 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 235000012254 magnesium hydroxide Nutrition 0.000 abstract 1
- 239000000347 magnesium hydroxide Substances 0.000 abstract 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000011575 calcium Substances 0.000 description 14
- 239000003814 drug Substances 0.000 description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000011734 sodium Substances 0.000 description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 235000011089 carbon dioxide Nutrition 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- SEPPVOUBHWNCAW-FNORWQNLSA-N (E)-4-oxonon-2-enal Chemical compound CCCCCC(=O)\C=C\C=O SEPPVOUBHWNCAW-FNORWQNLSA-N 0.000 description 1
- LLBZPESJRQGYMB-UHFFFAOYSA-N 4-one Natural products O1C(C(=O)CC)CC(C)C11C2(C)CCC(C3(C)C(C(C)(CO)C(OC4C(C(O)C(O)C(COC5C(C(O)C(O)CO5)OC5C(C(OC6C(C(O)C(O)C(CO)O6)O)C(O)C(CO)O5)OC5C(C(O)C(O)C(C)O5)O)O4)O)CC3)CC3)=C3C2(C)CC1 LLBZPESJRQGYMB-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
- Treating Waste Gases (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a system and a method for softening treatment of desulfurization wastewater of a coal-fired power plant. A primary reaction tank, a primary clarification tank, a secondary reaction tank and a secondary clarification tank are arranged, lime milk, sodium sulfate, polymeric ferric sulfate and polyacrylamide are added to the primary reaction tank for a primary reaction and clarified through the primary clarification tank, Mg(OH)2 and CaSO4*2H2O in the wastewater after the primary reaction are removed, the mixture has a secondary reaction in the secondary reaction tank, smoke is fed into the secondary reaction tank and is settled in the secondary clarification tank, CaCO3 is settled, and softening treatment of the desulfurization wastewater of the coal-fired power plant is completed. The system is simple in structure and easy to implement and facilitates industrial production; when the softening treatment effect is met, that is, the content of Mg<2+> is smaller than or equal to 5 mg/L and the content of Ca<2+> is smaller than or equal to 5 mg/L, the adding amount of chemical is reduced, and the chemical operation cost is reduced, so that the operation cost of a zero discharging system for the desulfurization wastewater of the coal-fired power plant is reduced, and the system has important economic benefits and environmental benefits.
Description
Technical field
The invention belongs to waste water zero-discharge technology field, coal-burning power plant, relate to a kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water.
Background technology
Coal-burning power plant will realize desulfurization wastewater zero release, must be cured process to desulfurization wastewater, and solidification treatment generally can adopt evaporative crystallization technique.Containing a large amount of fouling tendency ions such as calcium, magnesium in desulfurization wastewater, general Ca
2+concentration can reach 600 ~ 900mg/L, Mg
2+concentration can reach 3000 ~ 5000mg/L.Meanwhile, owing to also existing containing a large amount of sulfate ions, the calcium sulfate in waste water is in hypersaturated state, and water quality is unstable, and the extremely easy heat exchange surface at evaporation crystallization equipment forms fouling, greatly affects equipment normal operating efficiency.Therefore before evaporative crystallization, need to soften desulfurization wastewater, significantly reduce Ca in desulfurization wastewater
2+and Mg
2+content, ensure that evaporative crystallization technique normal table runs.
Current desulfurization wastewater zero release runs good coal-burning power plant and all adopts the softening treatment process combined with evaporative crystallization, wherein sofening treatment technique adopts Dual alkali (lime adds sodium carbonate two-stage sofening treatment), and system stable water outlet and water quality is (Mg better
2+≤ 5mg/L, Ca
2+≤ 5mg/L), make the evaporation crystallization equipment matting cycle longer, and matting expense is lower, but the medicament running cost of sofening treatment technique is up to 32.5 yuan/(m
3﹒ waste water), medicament running cost is too high makes the popularization of this technique be greatly limited, therefore coal-burning power plant desulfurization wastewater zero release engineering construction also seldom.
For reducing desulfurization wastewater sofening treatment medicament running cost, develop a kind of technique and method of novel softening Desulphurization for Coal-fired Power Plant waste water, (the Mg when meeting sofening treatment effect
2+≤ 5mg/L, Ca
2+≤ 5mg/L), reduce added amount of chemical, greatly save working cost, there is good development and application prospect.
Summary of the invention
For overcoming the problems of the prior art, the object of this invention is to provide a kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water, (the Mg when meeting sofening treatment effect
2+≤ 5mg/L, Ca
2+≤ 5mg/L), reduce added amount of chemical, reduce medicament running cost, thus reduce the working cost of Desulphurization for Coal-fired Power Plant wastewater zero discharge system.
For achieving the above object, the present invention adopts following technical scheme:
A kind of system of sofening treatment Desulphurization for Coal-fired Power Plant waste water, comprise first order reaction case, one-level settling pond, second order reaction case, secondary settling pond, wherein, one-level settling pond and secondary settling pond are all with water out and sludge outlet, the outlet of first order reaction case is connected with the entrance of one-level settling pond, the water out of one-level settling pond is connected with second order reaction tank inlet, and the outlet of second order reaction case is connected with secondary settling pond entrance.
First order reaction agitator and first order reaction case pH meter is provided with in described first order reaction case; Second order reaction agitator and second order reaction case pH meter is provided with in described second order reaction case.
Be provided with intermediate water tank between described one-level settling pond and second order reaction case, the water out of one-level settling pond is connected with the entrance of intermediate water tank, and intermediate water tank outlet is connected with the entrance of second order reaction case; Described intermediate water tank is provided with the middle water pump for the water in intermediate water tank being transported to second order reaction case.
Be provided with secondary between described second order reaction case outlet and secondary settling pond entrance and clarify service pump.
Also comprise pressure filter, the sludge outlet of one-level settling pond, the sludge outlet of secondary settling pond are all connected with the entrance of pressure filter, and the water out of pressure filter is connected with the entrance of first order reaction case.
One-level sludge pump is provided with between the sludge outlet of described one-level settling pond and pressure filter entrance; Secondary sludge pump is provided with between the sludge outlet of described secondary settling pond and pressure filter entrance.
A method for sofening treatment Desulphurization for Coal-fired Power Plant waste water, comprises the following steps:
1) first order reaction is carried out: first, desulfurization wastewater enters into first order reaction case, start first order reaction agitator simultaneously, and to first order reaction case feeding lime breast, sodium sulfate, bodied ferric sulfate, polyacrylamide, regulated the dosage of milk of lime by first order reaction pH meter, control ph is 11.0 ~ 11.5, and sodium sulfate dosage is 20 ~ 30g/L, bodied ferric sulfate dosage is 20 ~ 30mg/L, and the dosage of polyacrylamide is 0.5 ~ 1mg/L;
2) one-level clarification: after first order reaction terminates, desulfurization wastewater enters into one-level settling pond and clarifies, and makes Mg (OH)
2and CaSO
42H
2o precipitates;
3) second order reaction is carried out: the water outlet of one-level settling pond flows automatically to intermediate water tank, be transported in second order reaction case through middle water pump, flue gas pass into desulfurization in second order reaction case after, starts second order reaction agitator simultaneously, controls CO in flue gas by second order reaction pH meter
2dosage, control ph is 9.0 ~ 10.0;
4) secondary clarification: after second order reaction terminates, waste water is transported in secondary settling pond through secondary clarification service pump and clarifies, and makes CaCO
3precipitation, completes the sofening treatment of Desulphurization for Coal-fired Power Plant waste water.
Described step 2) in the body refuse that gets off of clarification postprecipitation be transported to pressure filter through one-level sludge pump and carry out press filtration; Described step 4) in the body refuse that gets off of clarification postprecipitation be transported in pressure filter through secondary sludge pump and carry out press filtration.
The filtrate water of described pressure filter turns back to first order reaction case, and mud cake is transported outward; The liquid that the water out of described secondary settling pond is discharged carries out evaporative crystallization.
Described step 4) in secondary settling pond, add polyacrylamide, and the dosage of polyacrylamide is 1 ~ 2mg/L.
Compared with prior art, the beneficial effect that has of the present invention:
The present invention proposes the method for milk of lime-sodium sulfate-flue gas sofening treatment desulfurization wastewater, during first order reaction, the medicaments such as feeding lime breast, sodium sulfate, bodied ferric sulfate, polyacrylamide, make the magnesium ion in desulfurization wastewater form magnesium hydrate precipitate to get off, meanwhile, sodium sulfate and calcium hydroxide reaction generate sodium hydroxide; Add flue gas during second order reaction, the sodium hydroxide that the carbonic acid gas in flue gas and first order reaction are generated reacts and generates sodium carbonate, makes the calcium ion in desulfurization wastewater form precipitation of calcium carbonate and gets off; In second order reaction case, pass into flue gas simultaneously, abundant aeration and stripping are carried out to waste water, the ammonia nitrogen in desulfurization wastewater can be reduced, make ammonia-nitrogen content in the desulfurization wastewater after softening be less than 10mg/L; Owing to adopting sodium sulfate to replace sodium carbonate of the prior art in present method, medicament running cost can reduce about 60% than two alkali tenderizer; While realizing wastewater treatment, utilization is cured to the carbonic acid gas in coal-fired plant flue gas, reduces the discharge of greenhouse gases, for coal-burning power plant's carbon dioxide discharge-reduction provides new development and utilization measure; The present invention adopts the Mg after milk of lime, sodium sulfate, flue gas combined sofening treatment in waste water
2+≤ 2mg/L, Ca
2+≤ 5mg/L; The present invention is (Mg when meeting sofening treatment effect
2+≤ 5mg/L, Ca
2+≤ 5mg/L), reduce added amount of chemical, reduce medicament running cost, thus reduce the working cost of Desulphurization for Coal-fired Power Plant wastewater zero discharge system, there is important economic benefit and environmental benefit.
Further, the sodium sulfate that first order reaction uses, source can be the sodium sulfate in evaporative crystallization mother liquor, also can be the sodium sulfate added outside system.Sodium sulfate in the sodium sulfate added outside use system or evaporative crystallization mother liquor, all can reduce costs.
The present invention is by arranging first order reaction case, one-level settling pond, second order reaction case, secondary settling pond, by adding the medicaments such as milk of lime, sodium sulfate, bodied ferric sulfate, polyacrylamide in first order reaction case, carry out first order reaction, and after the clarification of one-level settling pond, remove the Mg (OH) in desulfurization wastewater
2and CaSO
42H
2o, then carries out second order reaction in second order reaction case, by passing into flue gas in second order reaction case, carries out second order reaction, and carries out sedimentation through secondary settling pond, make CaCO
3precipitation, completes the process to Desulphurization for Coal-fired Power Plant waste water, and native system structure is simple, is easy to realize, is convenient to suitability for industrialized production.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein, 1-first order reaction case, 2-first order reaction box mixer, 3-first order reaction case pH meter, 4-one-level settling pond, 5-intermediate water tank, water pump in the middle of 6-, 7-second order reaction case, 8-second order reaction box mixer, 9-second order reaction case pH meter, 10-secondary clarification service pump, 11-secondary settling pond, 12-one-level sludge pump, 13-secondary sludge pump, 14-pressure filter.
Embodiment
Below in conjunction with example, the present invention is described in further detail:
See Fig. 1, the present invention includes first order reaction case 1, one-level settling pond 4, intermediate water tank 5, second order reaction case 7 and secondary settling pond 11, wherein, one-level settling pond 4 and secondary settling pond 11 are all with water out and sludge outlet, the outlet of first order reaction case 1 is connected with the entrance of one-level settling pond 4, the water out of one-level settling pond 4 is connected with intermediate water tank 5 entrance, intermediate water tank 5 outlet is connected with second order reaction case 7 entrance, second order reaction case 7 exports and is connected with secondary settling pond 11 entrance through secondary clarification service pump 10, the water out of secondary settling pond 11 discharges treated water, carry out evaporative crystallization, the sludge outlet of one-level settling pond 4 and secondary settling pond 11 is for discharging the body refuse through sedimentation, and the sludge outlet of one-level settling pond 4 is connected with pressure filter through one-level sludge pump 12, the sludge outlet of secondary settling pond 11 is connected with pressure filter through secondary sludge pump 13, from the body refuse of one-level settling pond 4 and the sludge outlet of secondary settling pond 11 through pressure filter 14 press filtration, filtrate water turns back to first order reaction case 1, mud cake is transported outward.
First order reaction agitator 2 and first order reaction case pH meter 3 is provided with in described first order reaction case 1;
Second order reaction agitator 8 and second order reaction case pH meter 9 is provided with in described second order reaction case 1;
Described intermediate water tank 5 is provided with the middle water pump 6 for the water in intermediate water tank 5 being transported to second order reaction case 7.
A method for sofening treatment Desulphurization for Coal-fired Power Plant waste water, comprises the following steps:
1) first order reaction is carried out: first, desulfurization wastewater enters into first order reaction case 1, start first order reaction agitator 2, and to medicaments such as first order reaction case feeding lime breast, sodium sulfate, bodied ferric sulfate, polyacrylamides, in first order reaction case, principal reaction is as follows simultaneously:
MgSO
4+Ca(OH)
2→Mg(OH)
2↓+CaSO
4↓
Na
2SO
4+Ca(OH)
2+2H
2O→NaOH+CaSO
4·2H
2O↓
Regulated the dosage of milk of lime by first order reaction pH meter 3, pH value general control is 11.0 ~ 11.5.Sodium sulfate dosage is 20 ~ 30g/L, and bodied ferric sulfate dosage is 20 ~ 30mg/L, and the dosage of polyacrylamide is 0.5 ~ 1mg/L.
2) one-level clarification: after first order reaction terminates, desulfurization wastewater enters into one-level settling pond 4 and clarifies, and makes Mg (OH)
2and CaSO
42H
2o precipitates, and the body refuse one-level sludge pump 11 settled down is transported to pressure filter and carries out press filtration.
3) second order reaction is carried out: one-level settling pond 4 water outlet flows automatically to intermediate water tank 5, be transported in second order reaction case 7 through middle water pump 6, flue gas pass into desulfurization in second order reaction case 7 after, start second order reaction agitator 8, in second order reaction case, principal reaction is as follows simultaneously;
2NaOH+CO
2→Na
2CO
3+H
2O
Na
2CO
3+CaSO
4→CaCO
3↓+Na
2SO
4
CO in flue gas is controlled by second order reaction pH meter 9
2dosage, pH value general control, 9.0 ~ 10.0, guarantees CO
2inexcessive.
4) secondary clarification: after second order reaction terminates, waste water is transported in secondary settling pond 11 by secondary clarification service pump 10 and clarifies, and adds polyacrylamide in secondary settling pond 11, and the dosage of polyacrylamide is 1 ~ 2mg/L, makes CaCO
3precipitate, body refuse secondary sludge pump 13 is transported in pressure filter and carries out press filtration.
The body refuse of one-level settling pond 4, secondary settling pond 11, enter pressure filter 14 and carry out press filtration, filtrate water turns back to first order reaction case 1, and mud cake is transported outward.
The present invention is (Mg when meeting sofening treatment effect
2+≤ 5mg/L, Ca
2+≤ 5mg/L), reduce added amount of chemical, reduce medicament running cost, thus reduce the working cost of Desulphurization for Coal-fired Power Plant wastewater zero discharge system, there is important economic benefit and environmental benefit.
The present invention mainly has following characteristics:
1) medicament such as first order reaction feeding lime breast, sodium sulfate, bodied ferric sulfate, polypropylene milling amine, make the magnesium ion in desulfurization wastewater form magnesium hydrate precipitate and get off, meanwhile, sodium sulfate and calcium hydroxide reaction generate sodium hydroxide;
2) sodium sulfate of first order reaction use, source can be the sodium sulfate in evaporative crystallization mother liquor, also can be the sodium sulfate added outside system;
3) second order reaction adds flue gas, and the sodium hydroxide that the carbonic acid gas in flue gas and first order reaction are generated reacts and generates sodium carbonate, makes the calcium ion in desulfurization wastewater form precipitation of calcium carbonate and gets off;
4) because native system and method adopt sodium sulfate to replace the method for sodium carbonate, medicament running cost can reduce about 60% than two alkali tenderizer;
5) native system and method are cured utilization to the carbonic acid gas in coal-fired plant flue gas while realizing wastewater treatment, reduce the discharge of greenhouse gases, for coal-burning power plant's carbon dioxide discharge-reduction provides new development and utilization measure;
6) Mg after employing milk of lime, sodium sulfate, flue gas combined sofening treatment in waste water
2+≤ 2mg/L, Ca
2+≤ 5mg/L;
7) in second order reaction case, pass into flue gas simultaneously, abundant aeration and stripping are carried out to waste water, the ammonia nitrogen in desulfurization wastewater can be reduced, make ammonia-nitrogen content in the desulfurization wastewater after softening be less than 10mg/L.
Below by an example, the present invention will be described.
The main Analysis Results of Water Quality of certain coal-fired electric desulfurization wastewater is in table 1.
Certain Desulphurization for Coal-fired Power Plant waste water quality of table 1 is analyzed
Adopt the method for milk of lime-sodium sulfate of the present invention-flue gas sofening treatment Desulphurization for Coal-fired Power Plant waste water, wherein desulfurization wastewater enters in first order reaction case 1, start first order reaction agitator 2 simultaneously, at medicaments such as first order reaction case feeding lime breast, sodium sulfate, bodied ferric sulfate, polyacrylamides, carry out chemical physics reaction, pH value controls about 11.0 ~ 11.5, enters in one-level settling pond 4 and clarifies, make the Mg in waste water after reaction
2+ion forms Mg (OH)
2precipitate, Mg after one-level is softening
2+≤ 2mg/L.The clear water of one-level settling pond 4 is from flowing in intermediate water tank 5, second order reaction case 7 is transported to by middle water pump 6, flue gas add desulfurization in second order reaction case 7 after, pH value controls about 9.0 ~ 10.0, be transported to secondary settling pond 11 by secondary clarification service pump 10 after abundant reaction to clarify, and add polyacrylamide in secondary settling pond 11, and the dosage of polyacrylamide is 1 ~ 2mg/L, makes the Ca in waste water
2+ion forms CaCO
3precipitate, Ca after secondary softening
2+≤ 5mg/L.The body refuse scum pump of one-level settling pond 4, secondary settling pond 11 is transported to pressure filter 14 and carries out press filtration, and filtrate water turns back in first order reaction case 1, and mud cake is transported outward.
Claims (10)
1. the system of a sofening treatment Desulphurization for Coal-fired Power Plant waste water, it is characterized in that, comprise first order reaction case (1), one-level settling pond (4), second order reaction case (7), secondary settling pond (11), wherein, one-level settling pond (4) and secondary settling pond (11) are all with water out and sludge outlet, the outlet of first order reaction case (1) is connected with the entrance of one-level settling pond (4), the water out of one-level settling pond (4) is connected with second order reaction case (7) entrance, second order reaction case (7) outlet is connected with secondary settling pond (11) entrance.
2. the system of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 1, is characterized in that, is provided with first order reaction agitator (2) and first order reaction case pH meter (3) in described first order reaction case (1); Second order reaction agitator (8) and second order reaction case pH meter (9) is provided with in described second order reaction case (1).
3. the system of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 1, it is characterized in that, intermediate water tank (5) is provided with between described one-level settling pond (4) and second order reaction case (7), the water out of one-level settling pond (4) is connected with the entrance of intermediate water tank (5), and intermediate water tank (5) outlet is connected with the entrance of second order reaction case (7); Described intermediate water tank (5) is provided with the middle water pump (6) for the water in intermediate water tank (5) being transported to second order reaction case (7).
4. the system of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 1, is characterized in that, is provided with secondary clarification service pump (10) between described second order reaction case (7) outlet secondary settling pond (11) entrance.
5. the system of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 1, it is characterized in that, also comprise pressure filter (14), the sludge outlet of one-level settling pond (4), the sludge outlet of secondary settling pond (11) are all connected with the entrance of pressure filter (14), and the water out of pressure filter (14) is connected with the entrance of first order reaction case (1).
6. the system of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 5, is characterized in that, is provided with one-level sludge pump (12) between the sludge outlet of described one-level settling pond (4) and pressure filter (14) entrance; Secondary sludge pump (13) is provided with between the sludge outlet of described secondary settling pond (11) and pressure filter (14) entrance.
7. a method for sofening treatment Desulphurization for Coal-fired Power Plant waste water, is characterized in that, comprises the following steps:
1) first order reaction is carried out: first, desulfurization wastewater enters into first order reaction case (1), start first order reaction agitator (2) simultaneously, and to first order reaction case feeding lime breast, sodium sulfate, bodied ferric sulfate, polyacrylamide, the dosage of milk of lime is regulated by first order reaction pH meter (3), control ph is 11.0 ~ 11.5, sodium sulfate dosage is 20 ~ 30g/L, bodied ferric sulfate dosage is 20 ~ 30mg/L, and the dosage of polyacrylamide is 0.5 ~ 1mg/L;
2) one-level clarification: after first order reaction terminates, desulfurization wastewater enters into one-level settling pond (4) and clarifies, and makes Mg (OH)
2and CaSO
42H
2o precipitates;
3) second order reaction is carried out: one-level settling pond (4) water outlet flows automatically to intermediate water tank (5), be transported in second order reaction case (7) through middle water pump (6), flue gas pass into desulfurization in second order reaction case (7) after, start second order reaction agitator (8) simultaneously, control CO in flue gas by second order reaction pH meter (9)
2dosage, control ph is 9.0 ~ 10.0;
4) secondary clarification: after second order reaction terminates, waste water is clarified service pump (10) through secondary and is transported in secondary settling pond (11) and clarifies, and makes CaCO
3precipitation, completes the sofening treatment of Desulphurization for Coal-fired Power Plant waste water.
8. the method for a kind of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 7, it is characterized in that, described step 2) in the body refuse that gets off of clarification postprecipitation be transported to pressure filter (14) through one-level sludge pump (11) and carry out press filtration; Described step 4) in the body refuse that gets off of clarification postprecipitation be transported to pressure filter (14) through secondary sludge pump (13) and carry out press filtration.
9. the method for a kind of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 8, is characterized in that, the filtrate water of pressure filter (14) turns back to first order reaction case (1), and mud cake is transported outward; The liquid that the water out of described secondary settling pond (11) is discharged carries out evaporative crystallization.
10. the method for a kind of sofening treatment Desulphurization for Coal-fired Power Plant waste water according to claim 7, is characterized in that, described step 4) in secondary settling pond (11), add polyacrylamide, and the dosage of polyacrylamide is 1 ~ 2mg/L.
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