CN115490355A - Coal fired power plant desulfurization effluent treatment plant - Google Patents
Coal fired power plant desulfurization effluent treatment plant Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 52
- 230000023556 desulfurization Effects 0.000 title claims abstract description 52
- 239000003245 coal Substances 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000002351 wastewater Substances 0.000 claims abstract description 35
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 28
- 239000012528 membrane Substances 0.000 claims abstract description 27
- 238000002425 crystallisation Methods 0.000 claims abstract description 21
- 230000008025 crystallization Effects 0.000 claims abstract description 21
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 7
- 235000002639 sodium chloride Nutrition 0.000 claims description 94
- 238000003756 stirring Methods 0.000 claims description 69
- 150000003839 salts Chemical class 0.000 claims description 63
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 62
- 238000001728 nano-filtration Methods 0.000 claims description 54
- 239000003513 alkali Substances 0.000 claims description 49
- 238000000926 separation method Methods 0.000 claims description 43
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 35
- 238000003825 pressing Methods 0.000 claims description 34
- 239000011780 sodium chloride Substances 0.000 claims description 31
- 238000004062 sedimentation Methods 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 25
- 239000010802 sludge Substances 0.000 claims description 19
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 238000005374 membrane filtration Methods 0.000 claims description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 11
- 239000004571 lime Substances 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 235000012255 calcium oxide Nutrition 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 5
- 239000012452 mother liquor Substances 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910001424 calcium ion Inorganic materials 0.000 claims description 2
- 238000010979 pH adjustment Methods 0.000 claims 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 239000004568 cement Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 abstract description 3
- 239000000347 magnesium hydroxide Substances 0.000 abstract description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 abstract description 3
- 241000196324 Embryophyta Species 0.000 abstract 4
- 244000286663 Ficus elastica Species 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 229910021645 metal ion Inorganic materials 0.000 abstract 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 14
- 239000000243 solution Substances 0.000 description 12
- 239000004317 sodium nitrate Substances 0.000 description 7
- 235000010344 sodium nitrate Nutrition 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 description 4
- 235000011152 sodium sulphate Nutrition 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-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
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 235000014413 iron hydroxide Nutrition 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- -1 sulfate radicals Chemical class 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
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- 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
- 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
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/04—Softening water by precipitation of the hardness using phosphates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a coal-fired power plant desulfurization wastewater treatment device, and belongs to the field of desulfurization wastewater treatment. The invention relates to a desulfurization wastewater treatment device of a coal-fired power plant, which is a brand new treatment process for respectively extracting metal ions and chloride ions which are easy to scale in wastewater through a physicochemical pretreatment technology, a membrane treatment technology and an evaporative crystallization technology and performing resource utilization, wherein the water produced by a reverse osmosis membrane is recycled on the production process, magnesium hydroxide, calcium sulfate and calcium carbonate precipitated by primary softening reaction are sent to a cement plant for cooperative treatment to produce cement, and calcium carbonate with higher purity and whiteness is extracted through secondary softening and can be used for raw materials and inner and outer wall whitewashing of a pvc plastic plant, a rubber plant, a coating plant and a waterproof material plant.
Description
Technical Field
The invention relates to the field of desulfurization wastewater treatment, in particular to a desulfurization wastewater treatment device for a coal-fired power plant.
Background
After flue gas of a coal-fired power plant is absorbed by slurry, a large amount of magnesium sulfate, calcium sulfate, nitrate, chloride, iron hydroxide and other salt substances can be generated, wherein a large amount of magnesium ions and a small amount of heavy metal substances in raw materials for grinding are in desulfurization wastewater, the slurry is continuously recycled in the prior art, the ions are continuously enriched in a system, brown substances precipitated in the cyclic absorption process are used as raw materials for manufacturing cement, and the main components of the brown substances comprise CaSO4, iron hydroxide, magnesium hydroxide, a small amount of heavy metal precipitates and the like. The hardness of the desulfurization waste water is particularly high, and the continuous enrichment of chloride ions in the desulfurization waste water can also seriously affect the recycling.
The water quality of the desulfurized wastewater is characterized by
(1) The pH value is 4-6.5, the water-soluble organic fertilizer is weakly acidic and contains a large amount of suspended matters, supersaturated sulfite, sulfate and heavy metals.
(2) High content of suspended matter (gypsum, siO) 2 Al and Fe), generally between 5000 and 16000 mg/L;
(3) Contains trace mercury, lead, chromium and other heavy metal ions and arsenic, selenium, cyanide and other pollutants;
(4) Contains a large amount of Ca 2+ 、Mg 2+ Cation and C1 - 、S0 4 2- 、NO - 3 Plasma, total Dissolved Solids (TDS) between 25000-60000mg/L, hardness around 16000mg/L, wherein C1 content is generally between 6000-25000 mg/L.
Therefore, the desulfurization wastewater has the characteristics of high salt content, high hardness and high C1 content, and has strong corrosivity and scaling property, the main sources of chlorine in the desulfurization process are coal, a desulfurizer and water, and due to the recycling of the desulfurization system water, chloride ions are gradually enriched in an absorption liquid, most metal pipelines and parts are seriously attached, and higher and effective anti-corrosion measures need to be taken.
This water must be effectively treated in order to preserve the environment and to allow stable operation of the process equipment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a coal-fired power plant desulfurization wastewater treatment device and a coal-fired power plant desulfurization wastewater treatment process.
The purpose of the invention can be realized by the following technical scheme:
a desulfurization wastewater treatment device for a coal-fired power plant comprises:
the system comprises a desulfurization wastewater collecting tank, a primary stirring softening device, a lime bin and adding device, a primary tubular membrane filtering system, a primary plate-and-frame filter pressing device, a secondary stirring softening device, a sodium carbonate dissolving and adding device, a secondary tubular membrane filtering system, a secondary plate-and-frame filter pressing device, a primary alkali-resistant high-pressure nano-filtration salt separating system, a secondary alkali-resistant nano-filtration salt separating system, a high-pressure reverse osmosis concentration system and a sodium chloride evaporative crystallization device.
The desulfurization wastewater collecting tank is characterized in that an outlet pipeline of the desulfurization wastewater collecting tank is connected with a first-stage stirring softening device, an overflow port of a sedimentation tank of the first-stage stirring softening device is connected with an inlet of a raw water tank of a first-stage tubular membrane filtering system, a clear liquid outlet of the first-stage tubular membrane filtering system is connected with an inlet pipeline of a second-stage stirring softening device, an overflow port of the sedimentation tank of the second-stage stirring softening device is connected with an inlet of the raw water tank of the second-stage tubular membrane filtering system, an outlet of a clear liquid buffer tank of the second-stage tubular membrane filtering system is connected with an inlet of the raw water buffer tank of the first-stage alkali-resistant high-pressure nanofiltration salt separation system, a concentrated water outlet pipeline of the high-pressure reverse osmosis concentration system is connected with an inlet pipeline of a sodium chloride evaporative crystallization device, a clear liquid outlet pipeline of the high-pressure reverse osmosis concentration system is connected with a circulating inlet of the desulfurization system, and a mother liquid outlet pipeline of the sodium chloride evaporative crystallization device is connected with a water tank water inlet of a plant biochemical system.
Wherein, desulfurization waste water on the desulfurization waste water collecting pit collection production line, tank bottom outlet pipe and one-level stirring softening installation access connection, lime feed bin and throw feeder apparatus throw quick lime to one-level stirring softening installation medicament to constantly stir and let its fully react, through the input of pH meter control quick lime, liquid pH after the stable control reaction is at 11 0.5 within range, and its chemical reaction formula has in aqueous solution:
Ca(OH) 2 +MgSO 4 ＝Mg(OH) 2 ↓+CaSO 4 ↓
Ca(OH) 2 +FeSO 4 ＝Fe(OH) 2 ↓+CaSO 4 ↓
4Fe(OH) 2 +O 2 +2H 2 O＝4Fe(OH) 3 ↓
the desulfurization waste water first-stage stirring softening device removes excessive sulfate radicals, magnesium ions, iron ions and the like in the waste water to generate precipitated heavy metal ions under the alkaline condition.
An overflow port of a sedimentation tank of the primary stirring and softening device is connected with an inlet of a raw water tank of the primary tubular membrane filtering system, a clear liquid outlet of the primary tubular membrane filtering system is connected with an inlet pipeline of the secondary stirring and softening device, a concentrated liquid outlet of the primary tubular membrane filtering system is connected with an inlet pipeline of the primary stirring and softening device, a sludge discharge pipeline at the bottom of the sedimentation tank of the primary stirring and softening device is connected with an inlet of the primary plate-and-frame filter pressing device, an outlet pipeline of a filtrate outlet collecting tank of the primary plate-and-frame filter pressing device is connected with an inlet of the primary stirring and softening device, and a sludge discharge groove conveyor of the primary plate-and-frame filter pressing device conveys the sludge to an outward transport vehicle compartment;
the overflow port of the sedimentation tank of the first-stage stirring softening device is connected with the inlet of the raw water tank of the first-stage tubular membrane filtering system, the clear liquid outlet of the first-stage tubular membrane filtering system is connected with the inlet pipeline of the second-stage stirring softening device, the sodium carbonate dissolving and adding device adds the sodium carbonate to the second-stage stirring softening device, the sodium carbonate is continuously stirred to fully react, the hardness of the wastewater is further reduced, and the chemical reaction formula of the sodium carbonate in the water solution is as follows:
Ca 2+ +Na 2 CO 3 ＝2Na + +CaCO 3 ↓
the sedimentation tank overflow mouth of second grade stirring softening installation is connected with the former feed water tank import of second grade tubular membrane filtration system, and the export of second grade tubular membrane filtration system's clear solution buffer tank is connected with the former feed water buffer tank import of one-level alkali-resistant high pressure nanofiltration salt system of dividing and is connected, and the thick water pipeline of one-level alkali-resistant high pressure nanofiltration salt system of dividing is connected with desulfurization waste water collecting pit import, and concentrated sodium sulfate solution gets into one-level stirring softening installation, and its chemical reaction formula has in the aqueous solution:
Ca(OH) 2 +Na 2 SO 4 ＝2NaOH+CaSO 4 ↓
salt system clear solution pipeline is separated with the alkaline-resisting of second grade to alkaline-resisting high pressure nanofiltration of one-level alkali-resisting high pressure nanofiltration is separated salt system raw water jar inlet pipe and is connected, the alkaline-resisting of second grade is nanofiltration is separated salt system raw water jar outlet pipe and is separated salt system inlet pipe with the alkaline-resisting of second grade and is connected, the alkaline-resisting of second grade is nanofiltration is separated salt system dense water outlet pipe and is separated salt system raw water buffer tank import with the alkaline-resisting high pressure nanofiltration of one-level and is connected, it reaches 60 with the mass ratio of sulfate radical to separate chloridion in the salt clear solution through the two-stage nanofiltration, make the sodium chloride purity that follow-up evaporative crystallization obtained satisfy the industrial salt one-level standard requirement.
The clear liquid outlet pipeline of the secondary alkali-resistant nanofiltration salt separation system is connected with the raw water tank inlet pipeline of the high-pressure reverse osmosis concentration system, the concentrated water outlet pipeline of the high-pressure reverse osmosis concentration system is connected with the inlet pipeline of the sodium chloride evaporative crystallization device, the hydrochloric acid is adjusted back to the pH device outlet pipeline and is connected with the concentrated water outlet pipeline of the high-pressure reverse osmosis concentration system, the hydrochloric acid and the concentrated water are uniformly mixed through a pipeline mixer, a pH meter is arranged at the tail end of the pipeline, the acid adding amount is controlled through PID, and the pH range is controlled to be between 6.5 and 7.5.
The clear liquid outlet pipeline of the high-pressure reverse osmosis concentration system is connected with the inlet of a circulating water tank of the desulfurization system, the mother liquid outlet pipeline of the sodium chloride evaporative crystallization device is connected with the water inlet of a plant biochemical system, and the clear liquid of the high-pressure reverse osmosis concentration system is alkaline water and can be used for absorbing acid gas in flue gas, so that the use amount of quicklime is saved.
The invention has the beneficial effects that:
1. the invention solves the problem of treatment of high-salt, high-hardness and high-chloride ion wastewater of a coal-fired power plant, simultaneously carries out resource utilization on the precipitate, and prepares industrial-grade sodium chloride after purifying sodium chloride in the wastewater;
2. the invention treats the waste water and simultaneously filters out alkaline water to return to the desulphurization circulating water tank, so as to continuously absorb sulfur dioxide and other acidic gases in the flue gas and reduce the usage amount of quicklime;
3. the invention greatly reduces the discharge amount of waste water, realizes the recycling of water resources, and only a very small amount of sodium chloride evaporative crystallization mother liquor containing sodium nitrate is treated by a biochemical system.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view showing the structure of a wastewater treatment apparatus according to the present application.
The parts corresponding to the reference numerals in the drawings are as follows:
the device comprises a desulfurization wastewater collection tank (01), a primary stirring softening device (02), a primary tubular membrane filtration system (03), a secondary stirring softening device (04), a secondary tubular membrane filtration system (05), a primary alkali-resistant high-pressure nanofiltration salt separation system (06), a secondary alkali-resistant nanofiltration salt separation system (07), a high-pressure reverse osmosis concentration system (08), a sodium chloride evaporation crystallization device (09), a lime storage bin and adding device (101), a sodium carbonate dissolving and adding device (102), a primary plate frame filter pressing device (103), a secondary plate frame filter pressing device (104), a primary back-pressing water inlet pump (105), a secondary plate frame filter pressing water inlet pump (106), an alkali-resistant high-pressure nanofiltration salt separation system raw water tank (107), a primary alkali-resistant high-pressure nanofiltration salt separation system water inlet pump (108) and a hydrochloric acid pH device (109).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a novel process and a novel device for treating desulfurization wastewater of a coal-fired power plant comprise a desulfurization wastewater collecting tank 01, a primary stirring softening device 02, a primary tubular membrane filtering system 03, a secondary stirring softening device 04, a secondary tubular membrane filtering system 05, a primary alkali-resistant high-pressure nano-filtration salt separation system 06, a secondary alkali-resistant nano-filtration salt separation system 07, a high-pressure reverse osmosis concentration system 08 and a sodium chloride evaporative crystallization device 09.
A lime bin and adding device 101, a sodium carbonate dissolving and adding device 102, a primary plate-and-frame filter pressing device 103, a secondary plate-and-frame filter pressing device 104, a primary filter pressing water inlet pump 105, a secondary filter pressing water inlet pump 106, a primary alkali-resistant high-pressure nano-filtration salt separation system raw water tank 107, a primary alkali-resistant high-pressure nano-filtration salt separation system water inlet pump 108 and a hydrochloric acid pH adjusting device 109.
The desulfurization wastewater collection pool comprises an adjusting pool, a water inlet pipeline and a water outlet pipeline and is used for caching homogeneous desulfurization wastewater;
an outlet pipeline of the desulfurization wastewater collecting tank is connected with a first-stage stirring softening device, an overflow port of a sedimentation tank of the first-stage stirring softening device is connected with an inlet of a raw water tank of a first-stage tubular membrane filtering system, a clear liquid outlet of the first-stage tubular membrane filtering system is connected with an inlet pipeline of a second-stage stirring softening device, an overflow port of a sedimentation tank of the second-stage stirring softening device is connected with an inlet of a raw water tank of a second-stage tubular membrane filtering system, an outlet of a clear liquid buffer tank of the second-stage tubular membrane filtering system is connected with an inlet of a raw water buffer tank of a first-stage alkali-resistant high-pressure nano-filtration salt separating system, a concentrated water pipeline of the first-alkali-resistant high-pressure nano-filtration salt separating system is connected with an inlet pipeline of a raw water tank of the desulfurization wastewater collecting tank, the clear liquid pipeline of the first-alkali-resistant high-pressure nano-filtration salt separating system is connected with an inlet pipeline of the second-alkali-resistant alkali-nano-separation salt separating system, the outlet pipeline of the raw water tank of the second-stage alkali-resistant nanofiltration salt separation system is connected with the inlet pipeline of the second-stage alkali-resistant nanofiltration salt separation system, the concentrated water outlet pipeline of the second-stage alkali-resistant nanofiltration salt separation system is connected with the inlet of the raw water buffer tank of the first-stage alkali-resistant high-pressure nanofiltration salt separation system, the clear water outlet pipeline of the second-stage alkali-resistant nanofiltration salt separation system is connected with the inlet pipeline of the raw water tank of the high-pressure reverse osmosis concentration system, the high-pressure reverse osmosis concentration system is characterized in that a concentrated water outlet pipeline is connected with an inlet pipeline of a sodium chloride evaporation and crystallization device, a clear water outlet pipeline of the high-pressure reverse osmosis concentration system is connected with an inlet of a circulating water tank of a desulfurization system, and a mother liquor outlet pipeline of the sodium chloride evaporation and crystallization device is connected with a water inlet of a plant biochemical system.
The device also comprises a lime bin and adding device, a sodium carbonate dissolving and adding device and a hydrochloric acid pH adjusting device.
An outlet pipeline of the desulfurization wastewater collecting tank is connected with a primary stirring softening device, outlets of the lime bin and the adding device are connected with a medicament adding inlet of the primary stirring softening device, an overflow port of a sedimentation tank of the primary stirring softening device is connected with an inlet of a raw water tank of a primary tubular membrane filtering system, a clear liquid outlet of the primary tubular membrane filtering system is connected with an inlet pipeline of a secondary stirring softening device, a concentrated liquid outlet of the primary tubular membrane filtering system is connected with an inlet pipeline of the primary stirring softening device, a sludge discharge pipeline at the bottom of the sedimentation tank of the primary stirring softening device is connected with an inlet of a primary plate frame filter pressing device, an outlet pipeline of a filtrate outlet collecting tank of the primary plate frame filter pressing device is connected with an inlet of the primary stirring softening device, and a sludge discharge groove conveyor of the primary plate frame filter pressing device is conveyed to an outward transport vehicle carriage;
the system comprises a sodium carbonate dissolving and adding device, a second-stage stirring and softening device, a second-stage membrane filtration system, a first-stage alkali-resistant high-pressure nanofiltration salt separation system, a second-stage plate frame filter press device, a second-stage sodium carbonate dissolving and adding device, a second-stage stirring and softening device, a medicament adding inlet, a second-stage stirring and softening device, a sedimentation tank overflow port, a second-stage alkali-resistant high-pressure nanofiltration salt separation system, a first-stage raw water buffer tank, a second-stage alkali-resistant high-pressure nanofiltration salt separation system, a second-stage membrane filtration system, a second-stage stirring and softening device inlet, a sedimentation tank bottom sludge discharge pipeline, a second-stage plate frame filter press device, a pressure filtrate outlet and collection tank, a second-stage stirring and softening device inlet, a second-stage plate frame filter press device sludge discharge tank conveyor and a second-plate frame filter press device.
The concentrated water pipeline of the primary alkali-resistant high-pressure nanofiltration salt separation system is connected with the inlet pipeline of the desulfurization wastewater collection tank, and the clear water pipeline of the primary alkali-resistant high-pressure nanofiltration salt separation system is connected with the inlet pipeline of the primary water tank of the secondary alkali-resistant nanofiltration salt separation system.
The outlet pipeline of the raw water tank of the secondary alkali-resistant nanofiltration salt separation system is connected with the inlet pipeline of the secondary alkali-resistant nanofiltration salt separation system, the outlet pipeline of the concentrated water of the secondary alkali-resistant nanofiltration salt separation system is connected with the inlet of the raw water buffer tank of the primary alkali-resistant high-pressure nanofiltration salt separation system, and the outlet pipeline of the clear water of the secondary alkali-resistant nanofiltration salt separation system is connected with the inlet pipeline of the raw water tank of the high-pressure reverse osmosis concentration system.
The outlet pipeline of the hydrochloric acid pH adjusting back device is connected with a concentrated water outlet pipeline of a high-pressure reverse osmosis concentration system, the concentrated water outlet pipeline of the high-pressure reverse osmosis concentration system is connected with an inlet pipeline of a sodium chloride evaporative crystallization device, a clear liquid outlet pipeline of the high-pressure reverse osmosis concentration system is connected with an inlet of a circulating water tank of a desulfurization system, and a mother liquid outlet pipeline of the sodium chloride evaporative crystallization device is connected with an inlet pipeline of a biochemical system.
Adding quicklime into the primary stirring softening device by a lime bin and a feeding device, adjusting the pH value to 11, reacting and precipitating insoluble substances such as magnesium hydroxide, calcium sulfate, ferric hydroxide and calcium carbonate, pumping a sludge discharge pipeline at the bottom of the sedimentation tank into a primary plate-and-frame filter pressing device by a sludge pump, performing filter pressing to obtain solids with the water content of about 70%, returning a filter pressing clear liquid to the primary stirring reaction tank, and returning a concentrated liquid of the primary tubular membrane filtration system to the sedimentation tank of the primary stirring softening device.
And adding a sodium carbonate solution into a secondary stirring and softening device by a sodium carbonate dissolving and adding device to react and precipitate calcium carbonate, removing excessive calcium ions added into water, pumping a sludge discharge pipeline at the bottom of the sedimentation tank into a secondary plate-and-frame filter pressing device by a sludge pump, performing filter pressing to obtain calcium carbonate solid with the water content of about 70%, returning a filter pressing clear liquid to a secondary stirring reaction tank, and returning a concentrated liquid of a secondary pipe-type membrane filtration system to the sedimentation tank of the secondary stirring and softening device.
The main components of the waste water after twice softening are sodium sulfate, sodium chloride and sodium nitrate, alkaline sodium sulfate concentrated solution is respectively obtained by a primary alkali-resistant high-pressure nanofiltration salt separation system and returned to a desulfurization waste water raw water tank, the main components of clear liquid are sodium chloride and sodium nitrate, and a very small amount of sodium sulfate is also obtained.
Sodium chloride and sodium nitrate solution obtained after treatment of a secondary alkali-resistant nanofiltration salt separation system enters a raw water tank of a high-pressure reverse osmosis concentration system, alkaline clear liquid with the pH value of 11 obtained after treatment of the high-pressure reverse osmosis concentration system returns to a desulfurization production line for recycling, concentrated solution obtained after treatment of the high-pressure reverse osmosis concentration system returns to the pH value of 6.5-7.5 through a hydrochloric acid pH value adjusting device, the concentrated solution enters a sodium chloride evaporation crystallization device, the mass ratio of sodium chloride to sodium nitrate is detected to be more than 3 times of that of the clear liquid in different batches, the saturated solubility of sodium chloride is 35.9g/100g of water at the temperature of 20 ℃, the saturated solubility of sodium nitrate is 87.6g/100g of water, crystals obtained at first after evaporation are sodium chloride crystal salt, and a small amount of mother liquor containing sodium chloride and sodium nitrate is subjected to biochemical system treatment.
The sodium chloride evaporation crystallization device is a multi-effect evaporator, the heat source utilizes the flue gas waste heat of a power plant or the waste heat steam generated by the power plant for self power generation to evaporate sodium chloride, the obtained sodium chloride crystal salt is dried by centrifugal separation and reaches the primary standard of industrial salt, the evaporated condensate water is recycled for preparing sodium carbonate solution, the redundant condensate water is recycled on a production line, mud cakes obtained by the primary plate frame filter pressing device can be used for producing cement by a cement plant for cooperative treatment, pure calcium carbonate is obtained by the secondary plate frame, the whiteness of the mud cakes meets the whiteness requirement of wall plastering, and the mud cakes can be used for PVC plastic factories, rubber factories, paint factories and waterproof material factories for plastering raw materials and inner and outer walls.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed.
Claims (7)
1. The utility model provides a coal fired power plant desulfurization effluent treatment plant which characterized in that includes:
the system comprises a desulfurization wastewater collecting tank, a primary stirring softening device, a lime bin and adding device, a primary tubular membrane filtering system, a primary plate-and-frame filter pressing device, a secondary stirring softening device, a sodium carbonate dissolving and adding device, a secondary tubular membrane filtering system, a secondary plate-and-frame filter pressing device, a primary alkali-resistant high-pressure nano-filtration salt separation system, a secondary alkali-resistant nano-filtration salt separation system, a high-pressure reverse osmosis concentration system and a sodium chloride evaporative crystallization device.
The utility model discloses a desulfurization waste water collecting tank, including desulfurization waste water collecting tank, one-level stirring softening installation's sedimentation tank overflow mouth and one-level tubular membrane filtration system's raw water tank import and be connected, one-level tubular membrane filtration system's clear solution export and second grade stirring softening installation's inlet pipeline are connected, second grade stirring softening installation's sedimentation tank overflow mouth and second grade tubular membrane filtration system raw water tank import are connected, second grade tubular membrane filtration system's clear solution buffer tank's export and the alkaline-resisting high pressure of one-level are received and are strained the raw water buffer tank import of salt system and be connected, high-pressure reverse osmosis concentration system dense water outlet pipeline is connected with sodium chloride evaporative crystallization device inlet pipeline, high-pressure reverse osmosis concentration system clear solution outlet pipeline is connected with desulfurization system circulation water tank import, sodium chloride evaporative crystallization device mother liquor outlet pipeline is connected with the biochemical system water inlet in factory.
2. The coal-fired power plant desulfurization wastewater treatment device according to claim 1, characterized by further comprising a lime silo and an adding device, a sodium carbonate dissolving and adding device, and a hydrochloric acid pH adjusting device;
an outlet pipeline of the desulfurization wastewater collecting tank is connected with a primary stirring softening device, outlets of the lime bin and the adding device are connected with a medicament adding inlet of the primary stirring softening device, an overflow port of a sedimentation tank of the primary stirring softening device is connected with an inlet of a raw water tank of a primary tubular membrane filtering system, a clear liquid outlet of the primary tubular membrane filtering system is connected with an inlet pipeline of a secondary stirring softening device, a concentrated liquid outlet of the primary tubular membrane filtering system is connected with an inlet pipeline of the primary stirring softening device, a sludge discharge pipeline at the bottom of the sedimentation tank of the primary stirring softening device is connected with an inlet of a primary plate-and-frame filter pressing device, an outlet pipeline of a filtrate outlet collecting tank of the primary plate-and-frame filter pressing device is connected with an inlet of the primary stirring softening device, and the primary plate-and-frame pressing device is conveyed to a carriage of an outward transport vehicle by a sludge discharge groove conveyor;
the system comprises a sodium carbonate dissolving and adding device, a second-stage stirring and softening device, a second-stage membrane filtration system, a first-stage alkali-resistant high-pressure nanofiltration salt separation system, a second-stage plate frame filter press device, a second-stage sodium carbonate dissolving and adding device, a second-stage stirring and softening device, a medicament adding inlet, a second-stage stirring and softening device, a sedimentation tank overflow port, a second-stage alkali-resistant high-pressure nanofiltration salt separation system, a first-stage raw water buffer tank, a second-stage alkali-resistant high-pressure nanofiltration salt separation system, a second-stage membrane filtration system, a second-stage stirring and softening device inlet, a sedimentation tank bottom sludge discharge pipeline, a second-stage plate frame filter press device, a pressure filtrate outlet and collection tank, a second-stage stirring and softening device inlet, a second-stage plate frame filter press device sludge discharge tank conveyor and a second-plate frame filter press device.
3. The desulfurization wastewater treatment device of claim 1, wherein the concentrated water pipeline of the primary alkali-resistant high-pressure nanofiltration salt separation system is connected with the inlet pipeline of the desulfurization wastewater collection tank, and the clear water pipeline of the primary alkali-resistant high-pressure nanofiltration salt separation system is connected with the inlet pipeline of the raw water tank of the secondary alkali-resistant nanofiltration salt separation system.
4. The desulfurization wastewater treatment device of claim 1, wherein the outlet pipeline of the raw water tank of the secondary alkali-resistant nanofiltration salt separation system is connected with the inlet pipeline of the secondary alkali-resistant nanofiltration salt separation system, the outlet pipeline of the concentrated water of the secondary alkali-resistant nanofiltration salt separation system is connected with the inlet of the raw water buffer tank of the primary alkali-resistant high-pressure nanofiltration salt separation system, and the outlet pipeline of the clear water of the secondary alkali-resistant nanofiltration salt separation system is connected with the inlet pipeline of the raw water tank of the high-pressure reverse osmosis concentration system.
5. The desulfurization wastewater treatment device for coal-fired power plants as recited in claim 2, wherein the hydrochloric acid pH adjustment back device outlet pipeline is connected with a raw water tank inlet pipeline of a high-pressure reverse osmosis concentration system, a concentrated water outlet pipeline of the high-pressure reverse osmosis concentration system is connected with an inlet pipeline of a sodium chloride evaporative crystallization device, a clear liquid outlet pipeline of the high-pressure reverse osmosis concentration system is connected with an inlet of a circulating water tank of a desulfurization system, and a mother liquid outlet pipeline of the sodium chloride evaporative crystallization device is connected with an inlet pipeline of a biochemical system.
6. The desulfurization wastewater treatment device for the coal-fired power plant according to claim 2, characterized in that a lime bin and a feeding device feed quicklime to a primary stirring softening device to adjust the pH value to 11, insoluble substances are precipitated by reaction, a sludge discharge pipeline at the bottom of the sedimentation tank is pumped into a primary plate-and-frame filter pressing device through a sludge pump, filter pressing clear liquid of the primary plate-and-frame filter pressing device returns to the primary stirring reaction tank, and concentrated liquid of the primary tubular membrane filtration system also returns to the sedimentation tank of the primary stirring softening device.
7. The desulfurization wastewater treatment device for the coal-fired power plant according to claim 2, characterized in that a sodium carbonate dissolving and adding device adds a sodium carbonate solution to a secondary stirring and softening device to react and precipitate calcium carbonate, excess calcium ions added in water are removed, a sludge discharge pipeline at the bottom of the sedimentation tank is pumped into a secondary plate-and-frame filter pressing device through a sludge pump, filter pressing clear liquid of the secondary plate-and-frame filter pressing device returns to the secondary stirring and reaction tank, and concentrated liquid of a secondary tubular membrane filtration system also returns to the sedimentation tank of the secondary stirring and softening device.
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