CN107082523B - Wet desulfurization wastewater recycling treatment system and treatment method thereof - Google Patents
Wet desulfurization wastewater recycling treatment system and treatment method thereof Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 104
- 230000023556 desulfurization Effects 0.000 title claims abstract description 104
- 239000002351 wastewater Substances 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004064 recycling Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 70
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 33
- 239000001110 calcium chloride Substances 0.000 claims abstract description 31
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 31
- 239000007787 solid Substances 0.000 claims abstract description 18
- 230000003750 conditioning effect Effects 0.000 claims abstract description 16
- 238000005189 flocculation Methods 0.000 claims abstract description 14
- 230000016615 flocculation Effects 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 13
- 238000005352 clarification Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims description 30
- 238000005507 spraying Methods 0.000 claims description 23
- 239000002699 waste material Substances 0.000 claims description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 21
- 239000003546 flue gas Substances 0.000 claims description 21
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 19
- 239000000920 calcium hydroxide Substances 0.000 claims description 19
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 19
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 19
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 16
- 239000000347 magnesium hydroxide Substances 0.000 claims description 14
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 239000008394 flocculating agent Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 4
- 239000000047 product Substances 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 6
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 5
- 239000003814 drug Substances 0.000 description 5
- 229910001425 magnesium ion Inorganic materials 0.000 description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/32—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- 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
-
- 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
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- 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
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A wet desulfurization wastewater recycling treatment system and a treatment method thereof comprise a desulfurization wastewater pretreatment system, a primary conditioning system, a deep modulation system and a solid calcium chloride generation system which are sequentially connected, wherein the desulfurization wastewater pretreatment system comprises a concentration tower, a desulfurization front flue and a desulfurization wastewater storage tank which are connected with the concentration tower; the first-stage conditioning system comprises a thick slurry discharge pump, a first-stage conditioning box and a first solid-liquid separation device which are sequentially connected along the water flow direction; the depth modulation system comprises a depth modulation box, a clarification flocculation tank and a solid-liquid separation device II which are sequentially connected along the water flow direction, wherein the depth modulation box is simultaneously connected with the solid-liquid separation device I and the dosing device II, and the clarification flocculation tank and the solid-liquid separation device II are both connected with the collecting tank II; the solid calcium chloride generating system comprises a dryer, a drying fan and a collecting tank III. The invention has the characteristics of safety, applicability and the like, has good popularization and practical value, and can generate good economic benefit after wide popularization and application.
Description
Technical Field
The invention relates to the field of wet desulfurization wastewater of thermal power plants, in particular to a wet desulfurization wastewater recycling treatment system and a wet desulfurization wastewater recycling treatment method.
Background
Wet desulfurization in thermal power plant produces a large amount of waste water, the cost of waste water is more complicated, the main solid components in waste water are dust and gypsum, and the liquid phase is mainly magnesium sulfate, magnesium chloride, calcium sulfate, calcium chloride and other salts. Because of the complex condition of changing the fire coal condition, the composition difference of the wet desulphurization waste water is also larger. The existing wastewater treatment technology mainly comprises the steps of adding chemicals to pretreat through a three-header, and then carrying out advanced treatment through reverse osmosis membrane, multi-effect evaporation, MVR evaporation and other processes, so as to realize zero emission of desulfurization wastewater.
The three-header dosing is to sequentially add medicines such as slaked lime milk, sodium carbonate, flocculating agent and the like into the desulfurization wastewater, and adjust the PH of the wastewater to be neutral; the pretreated wastewater is subjected to advanced treatment by utilizing technologies such as reverse osmosis membrane, multi-effect evaporation, MVR evaporation and the like. The technology has higher dosing cost, reverse osmosis membrane cost and steam consumption running cost, poor economy, the treated wastewater can not realize resource utilization, and a large amount of magnesium ions and chloride ions in the wastewater can not be effectively recycled.
Calcium chloride and magnesium hydroxide are two important chemical synthetic products, wherein the calcium chloride is mainly used for drying agents and snow melting agents, the magnesium hydroxide is mainly used for fireproof flame retardants, and the application is huge. At present, the domestic calcium chloride production adopts a method of hydrochloric acid and limestone (slaked lime) neutralization to generate a calcium chloride solution, and then the calcium chloride solution is dried to obtain a calcium chloride finished product; magnesium hydroxide is produced by using magnesia as material and alkali solution after dissolution. Both the production needs to consume a certain amount of raw materials, so the current market price is higher.
The wastewater of the limestone-gypsum wet desulfurization process contains a large amount of chloride ions and magnesium ions, and the chloride ions and the magnesium ions in the wastewater are directly discharged after the conventional wastewater treatment, so that water pollution and waste are caused. To above-mentioned problem, this patent provides a wet flue gas desulfurization waste water resourceful treatment system, utilizes the flue gas of desulfurization entry as dry medium, carries out concentration decrement to desulfurization waste water, obtains strong acidity, high chloride ion's concentrate, later utilizes low-priced slaked lime to add medicine, solid-liquid separation, flocculation precipitation process, obtains calcium chloride clear solution and magnesium hydrate solid, can produce calcium chloride and magnesium hydrate product respectively after the drying, realizes changing waste into valuables, solves desulfurization waste water emission's problem simultaneously.
Disclosure of Invention
The invention aims to provide a wet desulphurization wastewater recycling treatment system and a wet desulphurization wastewater recycling treatment method, which aim to solve the technical problems that the prior art is easy to cause water pollution and waste; and solves the technical problems of complex technical process and higher operation cost in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a wet desulfurization wastewater recycling treatment system is characterized in that: the desulfurization waste water pretreatment system comprises a concentration tower, a pre-desulfurization flue and a desulfurization waste water storage tank, wherein the pre-desulfurization flue and the desulfurization waste water storage tank are connected with the concentration tower in sequence, the lower part of the concentration tower is connected with the pre-desulfurization flue through a booster fan, the upper part of a part connected with the pre-desulfurization flue on the pre-desulfurization flue is connected with the top of the concentration tower through a pipeline, the desulfurization waste water storage tank is connected with the lower part of the concentration tower through a conveying pump, a demister and a spraying layer are sequentially arranged in the upper part of the concentration tower from top to bottom, and the spraying layer is connected with the lower part of the concentration tower through a circulating pump arranged outside the concentration tower;
the first-stage conditioning system comprises a thick slurry discharge pump, a first-stage conditioning box and a first solid-liquid separation device which are sequentially connected along the water flow direction, wherein the thick slurry discharge pump is connected with the bottom of the concentrating tower, the first-stage conditioning box is connected with a first chemical adding device, and the first solid-liquid separation device is connected with a first collecting tank;
the depth modulation system comprises a depth modulation box, a clarification flocculation tank and a solid-liquid separation device II which are sequentially connected along the water flow direction, wherein the depth modulation box is simultaneously connected with the solid-liquid separation device I and the dosing device II, and the clarification flocculation tank and the solid-liquid separation device II are both connected with the collecting tank II;
the solid calcium chloride generation system comprises a dryer, a drying fan and a collecting tank III, wherein the dryer is connected with the deep modulation system through a solid-liquid separation device II, and the dryer and the collecting tank III are both connected with the dryer.
Further preferably, the spraying layers are at least two layers, a single-phase hollow cone pressure nozzle is arranged on the spraying layers, and the particle size of the sprayed liquid drops is 1500-1400 microns.
Further, the demister is at least one layer and is a mechanical demister.
In addition, the first dosing device is internally provided with slaked lime, the second dosing device is a multistage series dosing device, and the slaked lime and the flocculating agent are arranged in the second dosing device.
More preferably, the first collecting tank is a first-stage waste residue collecting tank, the second collecting tank is a magnesium hydroxide collecting tank, and the third collecting tank is a calcium chloride collecting tank.
The treatment method of the wet desulfurization wastewater recycling treatment system is characterized by comprising the following steps of:
step one, desulfurization wastewater pretreatment: pumping desulfurization wastewater in a desulfurization wastewater storage tank into a concentration tower through a delivery pump, pumping high-temperature flue gas in a desulfurization front flue into the concentration tower through a booster fan, sequentially passing through a spraying layer in the concentration tower and a demister, returning the high-temperature flue gas to the desulfurization front flue through a pipeline arranged at the top of the concentration tower, spraying the desulfurization wastewater through the spraying layer, and evaporating the desulfurization wastewater into concentrated waste liquid through the high-temperature flue gas;
step two, primary tempering of desulfurization wastewater: pretreating desulfurization wastewater in the first step, enabling concentrated waste liquid to enter a first-stage conditioning tank through a thick slurry discharge pump, conditioning the desulfurization wastewater in the first-stage conditioning tank by using slaked lime arranged in a first dosing device, and separating generated first-stage filtering liquid from first-stage waste residues after conditioning by a first solid-liquid separation device;
step three, deep tempering of desulfurization wastewater: after desulfurization wastewater is subjected to primary quenching and tempering in the second step, the primary filtering liquid enters a deep-mixing box, slaked lime and flocculating agent in a second dosing device are utilized for quenching and tempering, and after quenching and tempering, the generated calcium chloride clear liquid is separated from magnesium hydroxide solids after being treated by a solid-liquid clarification flocculation tank and a second separation device;
step four, generating solid calcium chloride: and (3) after the desulfurization wastewater is subjected to deep tempering treatment in the step (III), enabling the calcium chloride clear liquid to enter a dryer, and drying the calcium chloride clear liquid through hot air by a drying fan to generate calcium chloride salt, so that the recycling treatment of the desulfurization wastewater is completed.
Further preferably, the temperature of the high-temperature flue gas in the first step is 100-150 ℃, and the flow velocity of the high-temperature flue gas in the tower is 2-5 m/s; the spraying liquid-gas ratio of the spraying layer is 1-10L/M 3 The method comprises the steps of carrying out a first treatment on the surface of the The PH value of the concentrated waste liquid is 0.2-2.0, and the concentration of chloride ions is 50000 mg/L-250000 mg/L, so that the concentrated waste liquid is a strong acid high corrosion liquid.
In addition, the PH value of the primary filtering liquid in the second step is 4-6.
More preferably, after the primary filtering liquid in the third step is quenched and tempered by the slaked lime and the flocculating agent in the second dosing device, the PH value is 9-11.5.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
the invention realizes the evaporation of the wastewater by utilizing the waste heat of the flue gas, can complete the concentration process of the desulfurization wastewater without an additional heat source, and solves the technical problem of the influence of complex and variable wastewater components on the process technology.
According to the invention, chloride ions and magnesium ions in the wastewater are utilized, and chemical dosing tempering is performed through the slaked lime with low price, so that calcium chloride and magnesium hydroxide products are finally generated, and the recycling of the wastewater is realized.
The invention has simple process and operation cost far lower than that of the conventional wastewater treatment processes such as membrane treatment, multi-effect evaporation and the like, can recycle the pure water in the wastewater, and reduces the water consumption of the subsequent desulfurization system.
The invention has the characteristics of safety, applicability and the like, has good popularization and practical value, and can generate good economic benefit after wide popularization and application.
Drawings
FIG. 1 is a schematic diagram of a wet desulfurization wastewater reclamation treatment system according to the present invention;
FIG. 2 is a flow chart of the operation of the invention for recycling desulfurization waste water.
Reference numerals: 1-a concentration tower; 2-a flue before desulfurization; 3-a desulfurization waste water storage tank; 4-a booster fan; 5-a delivery pump; 6-demister; 7-spraying a layer; 8-a circulating pump; 9-a thick stock discharge pump; 10-a first-stage tempering box; 11-a first solid-liquid separation device; 12-a first medicine adding device; 13-depth modulation box; 14-clarifying a flocculation tank; 15-a second solid-liquid separation device; 16-collecting groove I; 17-a second collecting tank; 18-a dryer; 19-a drying blower; 20-collecting tank III; 21-a second medicine adding device.
Detailed Description
In order to make the technical means, innovative features, achieved objects and effects of the present invention more obvious, the invention is further described with reference to the accompanying drawings.
The examples described herein are specific embodiments of the present invention, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the invention to the embodiments and scope of the invention. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification of the present application, including those adopting any obvious substitutions and modifications to the embodiments described herein.
A wet desulfurization wastewater recycling treatment system is shown in fig. 1, and comprises a desulfurization wastewater pretreatment system, a primary tempering system, a deep modulation system and a solid calcium chloride generation system which are sequentially connected, wherein the desulfurization wastewater pretreatment system comprises a concentration tower 1, a desulfurization front flue 2 and a desulfurization wastewater storage tank 3 which are connected with the concentration tower 1, the lower part of the concentration tower 1 is connected with the desulfurization front flue 2 through a booster fan 4, the upper part of the portion, which is connected with the desulfurization front flue 2, of the desulfurization front flue 2 is connected with the top of the concentration tower 1 through a pipeline, the desulfurization wastewater storage tank 3 is connected with the lower tower body of the concentration tower 1 through a conveying pump 5, a demister 6 and a spraying layer 7 are sequentially arranged in the upper tower body of the concentration tower 1 from top to bottom, the demister 6 is at least one layer of mechanical demister, the spraying layer 7 is connected with the lower tower body of the concentration tower 1 through a circulating pump 8 which is arranged outside the concentration tower 1, the spraying layer 7 is at least two layers, a single-phase hollow cone pressure nozzle is arranged on the spraying layer 7, and the particle size of liquid drops is 1500-1400 microns.
The first-stage conditioning system comprises a thick slurry discharge pump 9, a first-stage conditioning box 10 and a first solid-liquid separation device 11 which are sequentially connected along the water flow direction, wherein the thick slurry discharge pump 9 is connected with the bottom of the concentration tower 1, the first-stage conditioning box 10 is connected with a first dosing device 12, the first solid-liquid separation device 11 is connected with a first collecting tank 16, the first collecting tank 16 is a first-stage waste residue collecting tank, and slaked lime is filled in the first dosing device 12.
The depth modulation system comprises a depth modulation box 13, a clarification flocculation tank 14 and a second solid-liquid separation device 15 which are sequentially connected along the water flow direction, wherein the depth modulation box 13 is simultaneously connected with a first solid-liquid separation device 11 and a second dosing device 21, the clarification flocculation tank 14 and the second solid-liquid separation device 15 are both connected with a second collecting tank 17, the second dosing device 21 is a multistage series-connection dosing device, slaked lime and flocculant are arranged in the second collecting tank, and the second collecting tank 17 is a magnesium hydroxide collecting tank.
The solid calcium chloride generating system comprises a dryer 18, a drying fan 19 and a third collecting tank 20, wherein the dryer 18 is connected with the deep modulation system through a second solid-liquid separation device 15, the dryer 18 and the third collecting tank 20 are both connected with the dryer 18, and the third collecting tank 20 is a calcium chloride collecting tank.
The invention also relates to a treatment method of the wet desulfurization wastewater recycling treatment system, which is characterized by comprising the following steps as shown in fig. 2:
step one, desulfurization wastewater pretreatment: the desulfurization wastewater in the desulfurization wastewater storage tank 3 is pumped into the concentration tower 1 through the delivery pump 5, and meanwhile, the desulfurization wastewater in the pre-desulfurization flue 2 is pumped into the concentration tower through the booster fan 4The high-temperature flue gas is pumped into a concentration tower 1, the high-temperature flue gas sequentially passes through a spraying layer 7 and a demister 8 in the concentration tower 1 and then returns to a pre-desulfurization flue 2 through a pipeline arranged at the top of the concentration tower 1, desulfurization waste water is sprayed through the spraying layer 7, and the high-temperature flue gas evaporates the desulfurization waste water into concentrated waste liquid, wherein the temperature of the high-temperature flue gas is 100-150 ℃, and the flow rate of the high-temperature flue gas in the tower is 2-5 m/s; the spraying liquid-gas ratio of the spraying layer (7) is 1-10L/M 3 The method comprises the steps of carrying out a first treatment on the surface of the The PH value of the concentrated waste liquid is 0.2-2.0, and the concentration of chloride ions is 50000 mg/L-250000 mg/L, so that the concentrated waste liquid is a strong acid high corrosion liquid.
Step two, primary tempering of desulfurization wastewater: after the desulfurization wastewater is pretreated in the first step, concentrated waste liquid enters a first-stage tempering tank 10 through a thick slurry discharge pump 9, the desulfurization wastewater in the first-stage tempering tank 10 is tempered by slaked lime arranged in a first dosing device 12, after tempering, the desulfurization wastewater is treated by a first solid-liquid separation device 11, and the generated first-stage filtering liquid and the first-stage waste residue are separated, wherein the PH value of the first-stage filtering liquid is 4-6.
Step three, deep tempering of desulfurization wastewater: after desulfurization wastewater is subjected to primary quenching and tempering in the second step, the primary filtering liquid enters a deep-brewing box 13, slaked lime and flocculating agent in a second dosing device 21 are utilized for quenching and tempering, and the PH value after quenching and tempering is 9-11.5. After tempering, the calcium chloride clear liquid and the magnesium hydroxide solid are separated after being treated by a solid-liquid clarification flocculation tank 14 and a separation device II 15, and the magnesium hydroxide solid enters a collection tank II 17.
Step four, generating solid calcium chloride: after the desulfurization wastewater is subjected to deep tempering treatment in the third step, the clear calcium chloride solution enters a dryer 11, and is subjected to hot air drying by a drying fan 19 to generate calcium chloride product salt, and the calcium chloride product salt enters a collecting tank III 20, so that the desulfurization wastewater treatment is completed.
The treatment method of the invention is adopted to carry out the recycling treatment of the desulfurization wastewater in the following three embodiments, and the specific results are as follows:
embodiment one: the desulfurization device of the 1000MW coal-fired thermal power plant has the wastewater yield of 15t/h, wherein the wastewater composition is shown in the following table 1:
TABLE 1 desulfurization waste Water composition in example one
Adopting 120 ℃ flue gas as a concentration medium, wherein the flue gas amount is 360000NM 3 And/h, realizing the concentration of waste water in a flue gas concentration tower, and designing the concentration ratio to be 1:10. The diameter of the concentration tower is 6.5 m, the height is 30 m, the continuous slurry discharge amount after concentration is 1.5t/h, the PH of the concentrated slurry after concentration is 1.0, the chloride ion concentration is 120000mg/L, the magnesium ion concentration is 40000mg/L, and the strong acid corrosion characteristic is realized.
Adding a medicine to the concentrated slurry through primary slaked lime to adjust the pH value to 7.0, and precipitating a large amount of calcium sulfate to form sludge; after passing through the solid-liquid separation device, the filtrate is used for deep dosing treatment, the PH is slowly controlled to rise to 10.0, a large amount of magnesium hydroxide is separated out, and meanwhile, calcium chloride clear liquid is formed. And (3) respectively obtaining a calcium chloride solution and solid magnesium hydroxide after passing through a flocculation precipitation device and a solid-liquid separation device, and evaporating the calcium chloride solution by using a dryer to obtain calcium chloride solids.
The purity of the final product calcium chloride product is 85 percent (calculated as anhydrous calcium chloride); magnesium hydroxide purity 81% (dry basis).
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (5)
1. A treatment method of a wet desulphurization wastewater recycling treatment system is characterized by comprising the following steps: the wet desulfurization wastewater recycling treatment system comprises a desulfurization wastewater pretreatment system, a primary tempering system, a deep modulation system and a solid calcium chloride generation system which are sequentially connected, wherein the desulfurization wastewater pretreatment system comprises a concentration tower (1), a desulfurization front flue (2) and a desulfurization wastewater storage tank (3), wherein the desulfurization front flue (2) and the desulfurization wastewater storage tank (3) are all connected with the concentration tower (1), the lower part of the concentration tower (1) is connected with the desulfurization front flue (2) through a booster fan (4), the upper part of a part connected with the desulfurization front flue (2) on the desulfurization front flue (2) is connected with the top of the concentration tower (1) through a pipeline, the desulfurization wastewater storage tank (3) is connected with the lower part of the concentration tower (1) through a conveying pump (5), a demister (6) and a spray layer (7) are sequentially arranged in the upper part of the concentration tower (1) from top to bottom, and the spray layer (7) is connected with the lower part of the concentration tower body of the concentration tower (1) through a circulating pump (8) arranged outside the concentration tower (1). The primary conditioning system comprises a thick slurry discharge pump (9), a primary conditioning box (10) and a first solid-liquid separation device (11) which are sequentially connected along the water flow direction, wherein the thick slurry discharge pump (9) is connected with the bottom of the concentration tower (1), the primary conditioning box (10) is connected with a first dosing device (12), and the first solid-liquid separation device (11) is connected with a first collecting tank (16); the depth modulation system comprises a depth modulation box (13), a clarification flocculation tank (14) and a solid-liquid separation device II (15) which are sequentially connected along the water flow direction, wherein the depth modulation box (13) is simultaneously connected with the solid-liquid separation device I (11) and the dosing device II (21), and the clarification flocculation tank (14) and the solid-liquid separation device II (15) are both connected with the collecting tank II (17); the solid calcium chloride generation system comprises a dryer (18), a drying fan (19) and a third collecting tank (20), wherein the dryer (18) is connected with the depth modulation system through a second solid-liquid separation device (15), and the dryer (18) and the third collecting tank (20) are both connected with the dryer (18);
the treatment method of the wet desulfurization wastewater recycling treatment system comprises the following steps:
step one, desulfurization wastewater pretreatment: pumping desulfurization wastewater in a desulfurization wastewater storage tank (3) into a concentration tower (1) through a delivery pump (5), pumping high-temperature flue gas in a pre-desulfurization flue (2) into the concentration tower (1) through a booster fan (4), sequentially returning the high-temperature flue gas to the pre-desulfurization flue (2) through a spraying layer (7) and a demister (6) in the concentration tower (1) after passing through a pipeline arranged at the top of the concentration tower (1), spraying the desulfurization wastewater through the spraying layer (7), and evaporating the desulfurization wastewater into concentrated waste liquid by the high-temperature flue gas; the temperature of the high-temperature flue gas in the first step is 100-150 ℃, and the flow rate of the high-temperature flue gas in the tower is 2-5 m/s; the spray liquid-gas ratio of the spray layer (7) is 1-10L/M3; the pH value of the concentrated waste liquid is 0.2-2.0, and the concentration of chloride ions is 50000-250000 mg/L, so that the concentrated waste liquid is a strong acid high corrosion liquid;
step two, primary tempering of desulfurization wastewater: after the desulfurization wastewater is pretreated in the first step, the concentrated waste liquid enters a first-stage tempering tank (10) through a thick slurry discharge pump (9), slaked lime arranged in a first dosing device (12) is utilized to temper the desulfurization wastewater in the first-stage tempering tank (10), after tempering, the first-stage waste liquid is treated through a first solid-liquid separation device (11), the generated first-stage filtering liquid and the first-stage waste residue are separated, and the pH value of the first-stage filtering liquid is 4-6;
step three, deep tempering of desulfurization wastewater: after desulfurization wastewater is subjected to primary quenching and tempering in the second step, the primary filtered liquid enters a deep-mixing box (13), slaked lime and flocculant in a second dosing device (21) are utilized for quenching and tempering, and after quenching and tempering, the treated wastewater is treated by a solid-liquid clarification flocculation tank (14) and a second solid-liquid separation device (15), and the generated calcium chloride clear liquid is separated from magnesium hydroxide solids; the first-stage filtering liquid is subjected to tempering by using slaked lime and flocculating agent in a second dosing device (21), and the pH value is 9-11.5;
step four, generating solid calcium chloride: after the desulfurization wastewater is subjected to deep tempering treatment in the third step, the clear calcium chloride solution enters a dryer (18), and the clear calcium chloride solution is dried by hot air through a drying fan (19) to generate calcium chloride salt, so that the recycling treatment of the desulfurization wastewater is completed.
2. The process of claim 1, wherein: the spraying layers (7) are at least two layers, a single-phase hollow cone pressure nozzle is arranged on the spraying layers, and the particle size of sprayed liquid drops is 1500-1400 microns.
3. The process of claim 1, wherein: the demister (6) is at least one layer and is a mechanical demister.
4. The process of claim 1, wherein: the first dosing device (12) is internally provided with slaked lime, the second dosing device (21) is a multistage series dosing device, and the slaked lime and the flocculating agent are arranged in the multistage series dosing device.
5. The process of claim 1, wherein: the first collecting tank (16) is a first-stage waste residue collecting tank, the second collecting tank (17) is a magnesium hydroxide collecting tank, and the third collecting tank (20) is a calcium chloride collecting tank.
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| CN107082523B (en) * | 2017-05-25 | 2023-08-08 | 国能龙源环保有限公司 | Wet desulfurization wastewater recycling treatment system and treatment method thereof |
| CN107935083B (en) * | 2017-11-13 | 2021-02-09 | 北京国电富通科技发展有限责任公司 | Desulfurization wastewater treatment system for power plant |
| CN109052534A (en) * | 2018-07-19 | 2018-12-21 | 江苏京源环保股份有限公司 | A method of desulfurization wastewater zero-emission is evaporated using fume afterheat |
| CN109110846B (en) * | 2018-08-22 | 2021-11-09 | 盛发环保科技（厦门）有限公司 | Desulfurization wastewater flue gas concentration reduction and cementing fixing system and process |
| CN109095682A (en) * | 2018-08-31 | 2018-12-28 | 广东粤电靖海发电有限公司 | Desulphurization for Coal-fired Power Plant Waste water concentrating sofening treatment method and device |
| CN109607907A (en) * | 2018-10-17 | 2019-04-12 | 北京国电龙源环保工程有限公司 | A kind of desulfurization wastewater multi-heat source coupled processing system and processing method |
| CN109354098A (en) * | 2018-12-21 | 2019-02-19 | 萍乡市新安环保工程有限公司 | A kind of processing system and method for desulfurization wastewater |
| CN110075668A (en) * | 2019-05-14 | 2019-08-02 | 北京中能诺泰节能环保技术有限责任公司 | Waste water treatment system |
| CN110104717B (en) * | 2019-06-13 | 2021-09-14 | 华能安源发电有限责任公司 | Method and system for evaporating desulfurization wastewater and stabilizing circulating slurry by using bypass flue gas |
| CN110180366A (en) * | 2019-07-08 | 2019-08-30 | 通用技术集团工程设计有限公司 | A kind of smoke processing system |
| CN110642443A (en) * | 2019-10-23 | 2020-01-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Iron ore smelting system and method and treatment method of chlorine-containing wastewater |
| CN110668610A (en) * | 2019-11-07 | 2020-01-10 | 盛发环保科技（厦门）有限公司 | Desulfurization wastewater emission reduction and water quality treatment recycling process device |
| CN111675229A (en) * | 2020-04-27 | 2020-09-18 | 广东粤电靖海发电有限公司 | Process for purifying magnesium hydroxide from desulfurization wastewater of coal-fired power plant |
| CN111675370A (en) * | 2020-05-13 | 2020-09-18 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Method and device for modifying desulfurization wastewater concentrated solution |
| CN112110590A (en) * | 2020-09-28 | 2020-12-22 | 广东佳德环保科技有限公司 | Resource recovery system device and method for desulfurization wastewater |
| CN114471085A (en) * | 2021-12-27 | 2022-05-13 | 上海丛麟环保科技股份有限公司 | Hazardous waste incineration flue gas wet deacidification process and system |
| CN115259445A (en) * | 2022-07-12 | 2022-11-01 | 龙佰集团股份有限公司 | Treatment method of wet desulphurization spray liquid for inhibiting generation of sulfur dioxide |
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