CN112174361A - Process and chemical method for removing chloride ions in wet desulfurization and denitrification gypsum of thermal power plant - Google Patents
Process and chemical method for removing chloride ions in wet desulfurization and denitrification gypsum of thermal power plant Download PDFInfo
- Publication number
- CN112174361A CN112174361A CN201910582326.2A CN201910582326A CN112174361A CN 112174361 A CN112174361 A CN 112174361A CN 201910582326 A CN201910582326 A CN 201910582326A CN 112174361 A CN112174361 A CN 112174361A
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- China
- Prior art keywords
- gypsum
- medicine
- power plant
- thermal power
- chloride ions
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 17
- 230000023556 desulfurization Effects 0.000 title claims abstract description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 16
- 239000010440 gypsum Substances 0.000 title abstract description 29
- 229910052602 gypsum Inorganic materials 0.000 title abstract description 29
- 238000000034 method Methods 0.000 title abstract description 17
- 239000000126 substance Substances 0.000 title description 2
- 239000003814 drug Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000002351 wastewater Substances 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 238000005189 flocculation Methods 0.000 claims description 2
- 230000016615 flocculation Effects 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 3
- 239000000047 product Substances 0.000 abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 5
- 239000006227 byproduct Substances 0.000 abstract description 5
- 239000003546 flue gas Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000011449 brick Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000004566 building material Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 238000000108 ultra-filtration Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 102100025547 mRNA (2'-O-methyladenosine-N(6)-)-methyltransferase Human genes 0.000 description 1
- 101710115853 mRNA (2'-O-methyladenosine-N(6)-)-methyltransferase Proteins 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C01F11/46—Sulfates
- C01F11/468—Purification of calcium sulfates
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The thermal power plant produces desulfurized gypsum as a byproduct in the process of treating flue gas desulfurization and denitration of the coal-fired boiler, has large amount, is piled up and stored in the open air, occupies a large amount of land, causes secondary pollution to the environment, and wastes resources by paving and filling ditches at present. The method is different from advanced countries such as America, Germany, Japan, UK and the like, the Western countries mainly build factories to produce gypsum boards and cut bricks in production places, but China has no large-area development in this aspect, and only a small number of manufacturers for producing gypsum boards exist, and the production is stopped due to the high content of chloride ions in gypsum, and the problem of high chloride ion content in the wet desulfurization and denitration gypsum of a thermal power plant is solved by adopting the technology of 'removal process and medicine method of chloride ions in the wet desulfurization and denitration gypsum of the thermal power plant', so that the market is developed, and waste products are changed into products.
Description
Technical Field
When the process and the method for removing chloride ions in wet desulfurization gypsum of a thermal power plant thoroughly solve the problem of treatment of atmospheric pollution in the thermal power plant, the adopted desulfurization and denitration equipment generates desulfurized gypsum as a byproduct, the gypsum contains 2000 + chloride ions and 3000mg/L, the gypsum is used for building materials, other products such as building material gypsum boards and the like are damaged easily due to high chloride ion content, the production manufacturer stops producing and closing the doors, so that a large amount of gypsum raw materials accumulated in the thermal power plant cannot be solved, and a plurality of power plants fail to meet the environmental-friendly solid waste discharge standard when landfill, so that the problem is urgently solved at present. The technology of the invention thoroughly solves the problem that the gypsum has high chloride ion content and is not easy to be made into building material products, so that the thermal power plant controls heavy pollution desulfurization, and byproducts in denitration are changed into products from waste products. The gypsum board is widely used for producing building material products.
The amount of desulfurized gypsum discharged in China is more than 500 million tons every year, and most of desulfurized gypsum is abandoned in the open air or used for paving roads and filling ditches. The open-air stockpiling and the like occupy a large amount of land, cause secondary pollution to the environment and waste a large amount of high-quality resources.
Advanced countries such as the United states, Germany and Japan are basically all utilized, gypsum boards are mainly produced in factories of production places, and according to the current trend, desulfurized gypsum is expected to be in short supply all over the world in nearly two years.
Background
The power generation of a thermal power plant causes a large amount of waste gas containing sulfur and nitrate in burning coal, the waste gas can cause serious pollution when being discharged into the atmosphere, and acid rain or haze is formed to cause serious harm to the air environment, so that the health of human survival is endangered. People adopt various means for treating air pollution, and particularly, the desulfurization and denitrification equipment of a thermal power plant is a device for treating waste gas containing a large amount of sulfur and nitrate.
The DLWS desulfurization process takes limestone slurry as a washing absorbent, the whole desulfurization process is carried out in two stages, the two stages are divided into an upper stage and a lower stage, the two stages are synthesized in an absorption tower, the absorbent slurry is sprayed into the absorption tower, the absorption tower is fully contacted and mixed with flue gas, and the flue gas is washed, SO2 in the flue gas reacts with CaCO3 in the slurry and blown strong oxidation air. 2.7 tons of desulfurized gypsum can be produced as a byproduct of 1 ton of SO2, and 3 million tons of desulfurized gypsum are discharged every year if the sulfur content of coal is 1 percent in a 30-million KW coal-fired power plant. The large-scale desulfurization technical conditions of the thermal power plant are mature, and the total capacity of the flue gas desulfurization unit of the thermal power plant in the whole country at the end of 2016 years exceeds 5000 ten thousand KW. Wet desulfurization of coal containing 2% sulfur at 70% sulfur content resulted in an average desulfurization rate of 90% to produce 950 million tons of sulfur-containing gypsum. Therefore, the amount of desulfurized gypsum as a by-product is very large.
Disclosure of Invention
The first process comprises the following steps: in order to solve the problem that the quality of products of the desulfurized gypsum is highly influenced by the chloride ions in the building material industry, the gypsum mud in the discharged desulfurization and denitration wastewater is separated from the vacuum belt desliming machine and the filter cloth, and the chloride ions in the gypsum mud are brought into the desliming wastewater, so that the content of the chloride ions in the gypsum is reduced.
The second process comprises the following steps: a purifying device is arranged in the desliming wastewater pool, muddy water containing chloride ions is conveyed into the purifying device, and the wastewater enters the device to undergo tangential acceleration reaction in three stages. Adding alkaline agent, controlling pH at 7.5-8, adding polyaluminium chloride or polyferric sulfate liquid into the second medicine, controlling pH at 6.5-7.5, adding third medicine CAPAM at the third port, and sampling at water outlet to obtain wastewater flocculation separation. And the wastewater enters a sedimentation tank through a water outlet for sedimentation, and the sludge and the water are thoroughly separated within three minutes after the wastewater enters the sedimentation tank. The water quality is clear and colorless.
The third process comprises the following steps: a set of filter tank equipment matched with the purification of waste water per hour is installed, clear water in a pool is input through a tank filled with filter materials through power, the outlet water of the filter material tank enters an ultrafiltration device, and the outlet water from the ultrafiltration device is input into reverse osmosis device equipment through a safety valve power pump. Dechlorination ions are thoroughly eliminated through a pressurized filtering membrane, and a larger market is developed for the sale of the desulfurized gypsum in a power plant. The filter tank, the ultrafiltration equipment and the reverse osmosis equipment are mature equipment for purifying water quality at present, and can be purchased and installed for use according to actual needs.
The process flow comprises the following steps:
Detailed Description
Medicine name and liquid proportioning method
The first medicine is prepared by mixing sodium hydroxide and sodium bicarbonate in solid granule or powder 6: 4, and then mixing with tap water to obtain liquid, wherein the medicinal component in the liquid accounts for 20%.
The second medicine is polymeric ferric sulfate or polymeric aluminum chloride (solid powder), which is mixed with tap water and stirred into liquid, and the liquid medicine comprises 25 percent of components.
The third medicine is CPAm solid white powder which is mixed with tap water according to 1 per mill and stirred into liquid.
The three medicines are added into muddy water in three stages, the PH value of the first alkaline medicine is controlled to be 7.5-8, then the second medicine is added, the PH value of the second medicine is controlled to be 6.5-7, the water quality change is observed when the third medicine is added, the water quality is in a micro particle shape, then the third medicine is added, the overall water quality is in a floccule shape after the third medicine is added, and the mud residue in the water is thoroughly separated from the water and quickly settles in the water.
Claims (5)
1. The wastewater containing the chloride ions is added with the three medicaments by a purifying device in three stages, the flow is accelerated along the tangent line, so that the medicaments are fully mixed with the wastewater to react, and the desulfurization muddy water in the wastewater is purified.
2. The first agent names are sodium hydroxide and baking soda.
3. The second agent is named polyaluminium chloride or polyferric sulfate.
4. The third agent name is CPAm.
5. Adding three medicaments into a purification device in three stages, wherein the three medicaments are divided into three medicament adding ports and three control valves, wherein the first medicament is added from a water inlet, and the PH is controlled to be between 8 and 9; the second medicine is arranged 1m behind the water inlet; and the third medicament is 1m below the second medicament adding port. The three medicine adding openings are provided with water outlet valve ports for detecting PH, the PH detection opening is arranged at the position of the second medicine adding opening after the first medicine is added, the PH value standard is 8-8.9, the PH detection opening of the second medicine is arranged at the position of the third medicine adding opening, the PH value standard is 6.5-7, the third medicine detection opening is an outlet of a purifying device pipeline, and after flocculation, mud and water are separated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910582326.2A CN112174361A (en) | 2019-07-01 | 2019-07-01 | Process and chemical method for removing chloride ions in wet desulfurization and denitrification gypsum of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910582326.2A CN112174361A (en) | 2019-07-01 | 2019-07-01 | Process and chemical method for removing chloride ions in wet desulfurization and denitrification gypsum of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112174361A true CN112174361A (en) | 2021-01-05 |
Family
ID=73914904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910582326.2A Pending CN112174361A (en) | 2019-07-01 | 2019-07-01 | Process and chemical method for removing chloride ions in wet desulfurization and denitrification gypsum of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112174361A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022214897A1 (en) * | 2021-04-07 | 2022-10-13 | Knauf Gips Kg | Methods of removing chloride from gypsum having high level of chloride salt |
-
2019
- 2019-07-01 CN CN201910582326.2A patent/CN112174361A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022214897A1 (en) * | 2021-04-07 | 2022-10-13 | Knauf Gips Kg | Methods of removing chloride from gypsum having high level of chloride salt |
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Application publication date: 20210105 |