CN105214474B - A kind of flue gas desulfurization waste-water pretreatment system integrated with sludge and its technique - Google Patents
A kind of flue gas desulfurization waste-water pretreatment system integrated with sludge and its technique Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 88
- 230000023556 desulfurization Effects 0.000 title claims abstract description 87
- 239000002351 wastewater Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000003546 flue gas Substances 0.000 title claims abstract description 35
- 239000010802 sludge Substances 0.000 title claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 24
- 239000002244 precipitate Substances 0.000 claims abstract description 21
- 238000005345 coagulation Methods 0.000 claims abstract description 15
- 238000004062 sedimentation Methods 0.000 claims abstract description 14
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 13
- 239000010440 gypsum Substances 0.000 claims abstract description 11
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 11
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 239000013049 sediment Substances 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000003814 drug Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 5
- 229940079593 drug Drugs 0.000 claims abstract description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 36
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 239000006228 supernatant Substances 0.000 claims description 15
- 230000001590 oxidative effect Effects 0.000 claims description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 14
- 238000010992 reflux Methods 0.000 claims description 13
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 10
- 239000004571 lime Substances 0.000 claims description 10
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 7
- 125000000129 anionic group Chemical group 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000701 coagulant Substances 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims description 4
- 235000010261 calcium sulphite Nutrition 0.000 claims description 4
- 125000002091 cationic group Chemical group 0.000 claims description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 4
- 239000000347 magnesium hydroxide Substances 0.000 claims description 4
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 229920002472 Starch Polymers 0.000 claims 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 abstract description 4
- 230000003009 desulfurizing effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000004902 Softening Agent Substances 0.000 abstract description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 abstract description 2
- 235000019341 magnesium sulphate Nutrition 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 210000004209 hair Anatomy 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- SGIDZKQKQMFQNU-UHFFFAOYSA-N [dihydroxy(oxo)-$l^{6}-sulfanylidene]calcium Chemical compound OS(O)(=O)=[Ca] SGIDZKQKQMFQNU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 210000002966 serum Anatomy 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to a kind of flue gas desulfurization waste-water pretreatment system integrated with sludge and its techniques, including smoke-gas wet desulfurization system and waste water treatment system；Flue gas desulfurization waste-water initially enters Pre-coagulation pond, enters preformed precipitate pond after adding Pre-coagulation compound drug, separation of solid and liquid obtains being back in the cyclone of desulphurization system with gypsum or magnesium sulfate solid sediment as main component；The water outlet of preformed precipitate pond enters softening pond, is separated by solid-liquid separation, is obtained after separation with desulfurizing agent sediment as main component, then be back in desulfurization slurry case for flue gas desulfurization into softening sedimentation basin after adding compounding softening agent；The water outlet of softening sedimentation basin, which then enters in neutralization pond, adjusts pH to neutrality.The advantage of the invention is that：System organically combines smoke-gas wet desulfurization system and waste water treatment system, realizes the direct reuse of desulfurization wastewater sludge, reduces concentration and the dewatering unit of desulfurization wastewater sludge, reduces the investment and operating cost of desulfurization wastewater processing.
Description
Technical field
The present invention relates to a kind of flue gas desulfurization waste-water pretreatment system integrated with sludge and its techniques, belong to environmental protection
With water resources rational use technical field.
Background technique
Sulfur dioxide is both a kind of main atmosphere pollution and one of the major incentive that acid rain is formed.Related data
It has been shown that, nineteen ninety-five China's SO2 emissions have surmounted the U.S. as the first big country of world's sulfur dioxide (SO2) emissions.According to《2014
Year China Environmental State Bulletin》Statistics, national sulfur dioxide (SO2) emissions total amount is 1974.4 ten thousand tons, wherein the two of thermal power plant
Sulfur oxide emissions amount occupies first.Therefore, the characteristics of China's energy resource structure, determines that controlling the discharge of coal-fired sulfur dioxide is me
State controls the emphasis of sulfur dioxide pollution, and controlling step amount is to control coal-fired sulfur dioxide dirt
The key of dye.It puts into effect within 2013《Prevention and control of air pollution action plan》More stringent want is proposed to sulfur dioxide (SO2) emissions
It asks, also promotes the fast development of Coal,steam plant with FGD industry.By the end of the year 2014, put into operation coal steam-electric plant smoke in the whole nation
About 7.6 hundred million kilowatts of desulfurization machine set capacity, account for the 92.1% of national coal motor pool-size.
Wet process of FGD be occur neutralization reaction in absorption tower using the sulfur dioxide in alkaline matter and flue gas and
It removes, is discharged into atmosphere through chimney after the flue gas demisting after desulfurization.The Wet Flue Gas Desulfurization Technology being most widely used is with lime
Calcium method based on stone, proportion are secondly the magnesium processes based on MgO 90% or more.In based Wet Process Flue Gas
In, in order to maintain the balance of desulfurizer serum recycle system substance, preventing chloride ion in flue gas is more than specified value, guarantees by-product
The quality of object gypsum or magnesium sulfate, it is necessary to a certain amount of desulfurization wastewater is discharged from system.Thermal power plant desulfurization wastewater has
The feature that pH is low, suspension content is high and particle is small, usually also containing pollutants such as heavy metal, chloride, sulfate.
Raising with society to environmental protection requirement, country propose thermal power plant and realize the complete ultralow row of factory's waste water
Put the requirement of even zero-emission.Therefore, the terminal link as full factory's waste water cascade utilization, desulfurization wastewater zero-emission are firepower hairs
The key of power plant effluent zero-emission.China is generallyd use traditional using the firepower Thermal generation unit of flue gas desulfurization technique at present
" precipitating-flocculation-clarification " three header techniques.However, although three traditional header desulfuration waste water treatment process can reduce waste water
Turbidity, heavy metal and part hardness, but salt content is not substantially reduced, after processing can not reuse, to ecology influence after discharge
It is larger.Therefore, many R&D institutions and power generation unit have carried out the technological development for desulfurization wastewater zero-emission in recent years
Work.Such as multiple-effect evaporation technique, function of mechanical steam recompression technique, positive osmosis process have been applied successfully in power plant, realize
The efficient removal of salinity in desulfurization wastewater.However, above-mentioned technique faced in actual moving process in desulfurization wastewater hardness from
Son is in desalting system the problem of fouling.Even if there is also operational effects for melded system design using the power plant of melded system
The big problem of desulfurization wastewater specific resistance to filtration difficulty after difference, suspended matter increase softening agent dosage, pretreatment.Therefore, for
The element characteristics of flue gas desulphurization system and the water quality characteristics of desulfurization wastewater, developing operation is reliable, at high treating effect, Treatment of Sludge
Set the specific flue gas desulfurization waste-water softening pretreatment process method of outlet, water affairs management and " zero-emission " for thermal power plant
It has a very important significance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of reliable for operation, high treating effects, specific resistance to filtration outlet
Specific flue gas desulfurization waste-water pretreatment system integrated with sludge and its technique.
In order to solve the above technical problems, the technical scheme is that：A kind of flue gas desulfurization waste-water is integrated with sludge pre-
Processing system, innovative point are：Including smoke-gas wet desulfurization system and waste water treatment system；
The wet desulfurization system includes sequentially connected desulfurization slurry case, absorption tower, oxidizing tower, cyclone, vacuum skin
Band dewaterer and desulfurization wastewater pond；
The waste water treatment system include the preformed precipitate device for connecting and setting gradually with desulfurization wastewater pond, softening plant and
Neutralize device；The preformed precipitate device is made of the first dosing tank, Pre-coagulation pond and the preformed precipitate pond set gradually；The softening
Device is made of the second dosing tank, softening pond and the softening sedimentation basin set gradually；It is described neutralize device by set gradually the
Three dosing tanks and neutralization pond are constituted.
Further, the first reflux pump is installed between the preformed precipitate pond and cyclone.
Further, the second reflux pump is installed between the softening sedimentation basin and desulfurization slurry case.
The present invention is based on a kind of flue gas desulfurization waste-water pretreatment systems integrated with sludge, and it is useless to disclose a kind of flue gas desulfurization
Water pretreating process integrated with sludge, innovative point are：The pretreating process is specific as follows：
（1）The smoke absorption that boiler generates enters in absorption tower, while the feeding lime into desulfurization slurry case, is uniformly mixed
It is sprayed at the top of absorption tower afterwards, it is made to absorb the sulfur dioxide in flue gas, the slurry reaction of sulfur dioxide absorption generates sulfurous acid
Calcium simultaneously enters in oxidizing tower；
（2）Air is blasted into oxidizing tower at this time, calcium sulfite is made to force oxidation, crystallization, the slurries after oxidation enter rotation
It is separated by solid-liquid separation in stream device, the supernatant after separation of solid and liquid is back in oxidizing tower, and the concentrated slurry of bottom is through vacuum belt
Dewaterer dehydration forms the outward transport comprehensive utilization of solid gypsum after the completion of dehydration；Supernatant a part after the completion of dehydration is back to
In oxidizing tower, a part drains into desulfurization wastewater pond outside as flue gas desulfurization waste-water；
（3）Desulfurization wastewater in desulfurization wastewater pond enters Pre-coagulation pond, while the first dosing tank is added into Pre-coagulation pond
Lime and high polymer coagulant compound drug enter preformed precipitate pond after solution mixing, by suspended matter, the SO in desulfurization wastewater4 2-With
F-Precipitating, wherein sediment main component is gypsum, it is back in cyclone by the first reflux pump；
（4）The supernatant that preformed precipitate obtains enter softening pond, while the second dosing tank to softening pond in add sodium hydroxide,
Sodium carbonate and high polymer coagulant compound soft dose, and softening sedimentation basin is entered after solution mixing, the heavy metal ion in solution is sunk
It forms sediment, as long as sediment has magnesium hydroxide and calcium carbonate to constitute, it is back in desulfurization slurry case by the second reflux pump, as
Desulfurizing agent is used for flue gas desulfurization；
（5）The supernatant that softened sedimentation basin obtains enters neutralization pond, and salt is added into neutralization pond by third dosing tank
Acid adjusts supernatant pH to neutrality.
Further, the step（1）Magnesia can be added in middle desulfurization slurry case to be mixed.
Further, the step（3）The lime control pH added in middle Pre-coagulation pond is 7.5~8.0.
Further, the step（3）The high polymer coagulant that middle Pre-coagulation pond adds is cationic polyacrylamide, is thrown
Dosage is 2~20 mg/L.
Further, the step（4）Added in middle softening pond sodium hydroxide and sodium carbonate control pH be 10.5~
11.5。
Further, the step（4）The sodium carbonate dosage in middle softening pond is 2000~5000 mg/L.
Further, the step（4）The high polymer coagulant that middle softening pond adds is anionic polyacrylamide, is added
Amount is 5~50mg/L.
The advantage of the invention is that：
（1）Flue gas desulfurization waste-water pretreatment system integrated with sludge is by smoke-gas wet desulfurization system and waste water treatment system
It organically combining, desulfurization process is carried out to the flue gas that boiler generates, the mixed solution handled is constantly separated by solid-liquid separation, according to
Precipitation behavior transports outward comprehensive utilization after being back to system processing, or is back to device and continues to serve as desulfurizing agent, realizes that desulfurization is useless
The direct reuse of sewage sludge reduces concentration and the dewatering unit of desulfurization wastewater sludge, reduces the investment of desulfurization wastewater processing
And operating cost.
（2）Preformed precipitate device is set in system, removes in desulfurization wastewater with gypsum suspended matter as main component, avoids soft
The side reaction of agent and gypsum reduces added amount of chemical, improves sofening treatment efficiency；Softening plant effectively prevent film concentration, steams
The scale problems of the desalinations units such as hair；It is compounded, gypsum is realized in desulfurization wastewater preprocessing process and taken off by the combination of medicament
Sulphur agent（Magnesium hydroxide and calcium carbonate）High-purity independently recycle, have significant economic benefit；
（3）The pH value and dosage for controlling the medicament being added in device, are effectively ensured waste water treatment efficiency.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of flue gas desulfurization waste-water pretreatment system integrated with sludge of the present invention.
Specific embodiment
As shown in Figure 1, the invention discloses a kind of flue gas desulfurization waste-water pretreatment system integrated with sludge, including flue gas
Wet desulfurization system and waste water treatment system.
Wet desulfurization system includes sequentially connected desulfurization slurry case 2, absorption tower 1, oxidizing tower 3, cyclone 4, vacuum skin
Band dewaterer 5 and desulfurization wastewater pond 6.
Waste water treatment system include the preformed precipitate device for connecting and setting gradually with desulfurization wastewater pond 6, softening plant and in
And device；Preformed precipitate device is made of the first dosing tank 8, Pre-coagulation pond 7 and the preformed precipitate pond 9 set gradually；Softening plant by
The second dosing tank 11, softening pond 12 and the softening sedimentation basin 13 set gradually is constituted；Device is neutralized to be added by the third set gradually
Medicine-chest 16 and neutralization pond 15 are constituted；First reflux pump 10 is wherein installed between preformed precipitate pond 9 and cyclone 4, sedimentation basin 13 is softened
Second reflux pump 14 is installed between desulfurization slurry case 2.
Embodiment 1
The invention also discloses a kind of flue gas desulfurization waste-water pretreating process integrated with sludge, the pretreating process is specific
It is as follows：
（1）The smoke absorption that boiler generates enters in absorption tower 1, while the feeding lime into desulfurization slurry case 2, and mixing is equal
It is sprayed at the top of absorption tower 1 after even, it is made to absorb the sulfur dioxide in flue gas, the slurry reaction of sulfur dioxide absorption generates sulfurous
Sour calcium simultaneously enters in oxidizing tower 3；
（2）Air is blasted into oxidizing tower 3 at this time, calcium sulfite is made to force oxidation, crystallization, the slurries after oxidation enter rotation
It is separated by solid-liquid separation in stream device 4, the supernatant after separation of solid and liquid is back in oxidizing tower 3, and the concentrated slurry of bottom is through vacuum skin
Band dewaterer 5 is dehydrated, and the outward transport comprehensive utilization of solid gypsum is formed after the completion of dehydration；Supernatant a part reflux after the completion of dehydration
Into oxidizing tower 3, a part drains into desulfurization wastewater pond 6 outside as flue gas desulfurization waste-water；
（3）Desulfurization wastewater in desulfurization wastewater pond 6 enters Pre-coagulation pond 7, while the first dosing tank 8 is into Pre-coagulation pond 7
Feeding lime and cationic polyacrylamide compound drug, wherein lime control pH is 7.5~8.0, cationic polyacrylamide
Dosage control is 2~20 mg/L, then enters preformed precipitate pond 9 after solution mixing, by suspended matter, the SO in desulfurization wastewater4 2-
And F-Precipitating, wherein sediment main component is gypsum, it is back in cyclone 4 by the first reflux pump 10；
（4）The supernatant that preformed precipitate obtains enters softening pond 12, while the second dosing tank 11 adds hydrogen into softening pond 12
Sodium oxide molybdena, sodium carbonate and anionic polyacrylamide compound soft dose, and wherein sodium hydroxide and sodium carbonate control pH are 8~10.5,
Sodium carbonate dosage is 1000~2000 mg/L, and the control of anionic polyacrylamide dosage is 2~5mg/L, and then solution is mixed
Enter softening sedimentation basin 13 after conjunction, the heavy metal ion in solution is precipitated, as long as sediment has magnesium hydroxide and calcium carbonate structure
At it is back in desulfurization slurry case 2 by the second reflux pump 14, is used for flue gas desulfurization as desulfurizing agent；
（5）The supernatant that softened sedimentation basin obtains enters neutralization pond 15, through third dosing tank 16 into neutralization pond 15
It adds hydrochloric acid and adjusts supernatant pH to neutrality.
When using the pretreating process, after system continuous work 3 months, the average fouling of softening plant inner wall with a thickness of
2.96mm。
Embodiment 2
The present embodiment is compared to the difference of embodiment 1：Step（4）The pH of middle sodium hydroxide and sodium carbonate is controlled
10.5~11.5, sodium carbonate dosage is 2000~5000 mg/L, and the control of anionic polyacrylamide dosage is 5~50mg/
L。
When using the pretreating process, after system continuous work 3 months, the average fouling of softening plant inner wall with a thickness of
1.84mm。
Embodiment 3
The present embodiment is compared to the difference of embodiment 1：Step（4）The pH of middle sodium hydroxide and sodium carbonate is controlled
11.5~13, sodium carbonate dosage is 5000~8000 mg/L, and the control of anionic polyacrylamide dosage is 50~70mg/
L。
When using the pretreating process, after system continuous work 3 months, the average fouling of softening plant inner wall with a thickness of
3.12mm。
Therefore according to above-described embodiment, the average fouling thickness of softening plant inner wall is minimum in embodiment 2, therefore selects hydrogen
The pH of sodium oxide molybdena and sodium carbonate is 10.5~11.5, and sodium carbonate dosage is 2000~5000 mg/L, anionic polyacrylamide
Dosage control is 5~50mg/L.
Basic principles and main features of the invention have been shown and described above.It should be understood by those skilled in the art that
The present invention is not limited to the above embodiments, and the above embodiments and description only illustrate the principle of the present invention,
Without departing from the spirit and scope, various changes and improvements may be made to the invention, these changes and improvements are all fallen
Enter in scope of the claimed invention.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (8)
1. a kind of flue gas desulfurization waste-water pretreatment system integrated with sludge, it is characterised in that：Including smoke-gas wet desulfurization system
And waste water treatment system；
The wet desulfurization system includes that sequentially connected desulfurization slurry case, absorption tower, oxidizing tower, cyclone, vacuum belt are de-
Water dispenser and desulfurization wastewater pond；
The waste water treatment system includes preformed precipitate device, softening plant and the neutralization for connecting and setting gradually with desulfurization wastewater pond
Device；The preformed precipitate device is made of the first dosing tank, Pre-coagulation pond and the preformed precipitate pond set gradually；The softening plant
It is made of the second dosing tank, softening pond and the softening sedimentation basin set gradually；The neutralization device is added by the third set gradually
Medicine-chest and neutralization pond are constituted；
First reflux pump is installed between the preformed precipitate pond and cyclone, is installed between the softening sedimentation basin and desulfurization slurry case
Second reflux pump.
2. a kind of based on a kind of pretreatment work of flue gas desulfurization waste-water pretreatment system integrated with sludge described in claim 1
Skill, it is characterised in that：The pretreating process is specific as follows：
(1) smoke absorption that boiler generates enters in absorption tower, while the feeding lime into desulfurization slurry case, after mixing from
It is sprayed at the top of absorption tower, it is made to absorb the sulfur dioxide in flue gas, the slurry reaction of sulfur dioxide absorption generates calcium sulfite simultaneously
Into in oxidizing tower；
(2) air is blasted into oxidizing tower at this time, calcium sulfite is made to force oxidation, crystallization, the slurries after oxidation enter cyclone
In be separated by solid-liquid separation, the supernatant after separation of solid and liquid is back in oxidizing tower, and the concentrated slurry of bottom is dehydrated through vacuum belt
Machine dehydration forms the outward transport comprehensive utilization of solid gypsum after the completion of dehydration；Supernatant a part after the completion of dehydration is back to oxidation
In tower, a part drains into desulfurization wastewater pond outside as flue gas desulfurization waste-water；
(3) desulfurization wastewater in desulfurization wastewater pond enters Pre-coagulation pond, while the first dosing tank feeding lime into Pre-coagulation pond
With high polymer coagulant compound drug, enter preformed precipitate pond after solution mixing, by suspended matter, the SO in desulfurization wastewater4 2-And F-It is heavy
It forms sediment, wherein sediment main component is gypsum, it is back in cyclone by the first reflux pump；
(4) supernatant that preformed precipitate obtains enters softening pond, while the second dosing tank adds sodium hydroxide, carbonic acid into softening pond
Sodium and high polymer coagulant compound soft dose, and softening sedimentation basin is entered after solution mixing, the heavy metal ion in solution is precipitated, is sunk
Starch is mainly made of magnesium hydroxide and calcium carbonate, it is back in desulfurization slurry case by the second reflux pump, as desulfurization
Agent is used for flue gas desulfurization；
(5) supernatant that softened sedimentation basin obtains enters neutralization pond, and hydrochloric acid tune is added into neutralization pond by third dosing tank
Supernatant pH is saved to neutrality.
3. pretreating process according to claim 2, it is characterised in that：It can be thrown in desulfurization slurry case in the step (1)
Magnesia is added to be mixed.
4. pretreating process according to claim 2, it is characterised in that：It is added in Pre-coagulation pond in the step (3)
It is 7.5~8.0 that lime, which controls pH,.
5. pretreating process according to claim 2, it is characterised in that：The height that Pre-coagulation pond adds in the step (3)
Molecular flocculant is cationic polyacrylamide, and dosage is 2~20mg/L.
6. pretreating process according to claim 2, it is characterised in that：The hydrogen added in softening pond in the step (4)
Sodium oxide molybdena and sodium carbonate control pH are 10.5~11.5.
7. pretreating process according to claim 2, it is characterised in that：The sodium carbonate in softening pond is thrown in the step (4)
Dosage is 2000~5000mg/L.
8. pretreating process according to claim 2, it is characterised in that：The high score that softening pond adds in the step (4)
Sub- flocculant is anionic polyacrylamide, and dosage is 5~50mg/L.
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| CN106007046B (en) * | 2016-05-10 | 2019-06-11 | 上海电力学院 | A kind of desulfurization wastewater hardness ions recycling pretreating process |
| CN106379953A (en) * | 2016-10-14 | 2017-02-08 | 北京姚魏环保技术有限公司 | Desulfurization wastewater sludge-water mixing device |
| CN106830425A (en) * | 2017-02-27 | 2017-06-13 | 上海电力学院 | It is a kind of to remove system and its technique that sulfate radical in waste water recycles sediment |
| CN109095484A (en) * | 2018-10-30 | 2018-12-28 | 华北电力大学（保定） | A method of utilizing desulfurization wastewater preparing magnesium hydroxide |
| CN109095732B (en) * | 2018-10-30 | 2021-10-29 | 华北电力大学（保定） | Process for preparing high-purity magnesium hydroxide based on magnesium-method desulfurization wastewater |
| CN110028178A (en) * | 2019-04-17 | 2019-07-19 | 新疆中泰化学阜康能源有限公司 | The method and device thereof of coagulation chemical oxidation coprecipitation method processing desulfurization wastewater |
| CN111689608A (en) * | 2020-06-18 | 2020-09-22 | 上海电力大学 | Desulfurization wastewater zero-discharge pretreatment process based on three-alkali method |
| CN112194318A (en) * | 2020-09-28 | 2021-01-08 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Flue gas waste heat concentration method and device for desulfurization wastewater |
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