CN110697939A - Thermal power plant flue gas desulfurization wastewater chlorine reduction recycling system and process - Google Patents
Thermal power plant flue gas desulfurization wastewater chlorine reduction recycling system and process Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 200
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 145
- 230000023556 desulfurization Effects 0.000 title claims abstract description 145
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000003546 flue gas Substances 0.000 title claims abstract description 70
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000000460 chlorine Substances 0.000 title claims abstract description 47
- 229910052801 chlorine Inorganic materials 0.000 title claims abstract description 47
- 238000004064 recycling Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 claims abstract description 47
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 44
- 239000000701 coagulant Substances 0.000 claims abstract description 20
- 239000010802 sludge Substances 0.000 claims abstract description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 229910052783 alkali metal Inorganic materials 0.000 claims description 29
- 239000003513 alkali Substances 0.000 claims description 28
- 239000006228 supernatant Substances 0.000 claims description 26
- 239000002244 precipitate Substances 0.000 claims description 25
- 235000019738 Limestone Nutrition 0.000 claims description 22
- 239000006028 limestone Substances 0.000 claims description 22
- 150000001340 alkali metals Chemical class 0.000 claims description 21
- 125000001741 organic sulfur group Chemical group 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 19
- 239000007921 spray Substances 0.000 claims description 15
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 13
- 239000008394 flocculating agent Substances 0.000 claims description 13
- 230000003009 desulfurizing effect Effects 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 9
- 239000012065 filter cake Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 239000008267 milk Substances 0.000 claims description 7
- 210000004080 milk Anatomy 0.000 claims description 7
- 235000013336 milk Nutrition 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 239000013049 sediment Substances 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 4
- 238000005352 clarification Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 241000370738 Chlorion Species 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 13
- 239000010440 gypsum Substances 0.000 description 22
- 229910052602 gypsum Inorganic materials 0.000 description 22
- 229910001385 heavy metal Inorganic materials 0.000 description 22
- 150000002500 ions Chemical class 0.000 description 21
- 239000000706 filtrate Substances 0.000 description 19
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 11
- 239000000920 calcium hydroxide Substances 0.000 description 11
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 10
- -1 fluoride ions Chemical class 0.000 description 9
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 239000003814 drug Substances 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 7
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 5
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 238000006298 dechlorination reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 150000002736 metal compounds Chemical class 0.000 description 3
- 230000003472 neutralizing effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000000463 material Substances 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
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 238000013014 water-saving technology Methods 0.000 description 1
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
- 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
- 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
-
- 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
- C02F1/52—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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/29—Chlorine compounds
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treating Waste Gases (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a thermal power plant flue gas desulfurization waste water chlorine reduction recycling system which comprises a waste water tank, a triple box, a clarifier, a sludge dewatering device and a clear water tank, wherein the triple box comprises a neutralization box, a reaction box and a settling box which are sequentially connected, the waste water tank is connected with the neutralization box in the triple box through a pipeline, the settling box in the triple box is connected with the clarifier through a pipeline, the upper part of the clarifier is connected with the clear water tank through a pipeline, and the bottom of the clarifier is connected with the sludge dewatering device through a pipeline. A first adding device is further arranged on a pipeline between the neutralization box and the wastewater box, a second adding device is arranged above the reaction box, and a coagulant aid adding device is arranged above the settling box. The invention can reduce the concentration of chloride ions, realize the recycling of wastewater and effectively improve the wastewater treatment efficiency. The invention also provides a chlorine reduction recycling process for the thermal power plant flue gas desulfurization wastewater, which simplifies the treatment process of removing chloride ions, reaches the wastewater recycling standard and saves the operation cost of desulfurization wastewater treatment.
Description
Technical Field
The invention relates to the technical field of waste water treatment of a thermal power plant, in particular to a system and a process for chlorine reduction and recycling of flue gas desulfurization waste water of the thermal power plant.
Background
Flue gas generated by combustion power generation of a thermal power plant contains a large amount of sulfur oxides, and the sulfur oxides are one of main atmospheric pollutants, so the flue gas of the thermal power plant needs to be subjected to desulfurization treatment. The wet desulphurization is a desulphurization process widely used, has high desulphurization reaction speed and high efficiency, is suitable for flue gas desulphurization of large-scale thermal power plants, and most thermal power plants in China use limestone wet desulphurization technology to remove oxysulfide in the flue gas. However, the wastewater generated by wet desulphurization is complex in composition and various in pollutant types, and is the most difficult wastewater to treat in the production of thermal power plants. The flue gas desulfurization wastewater of the thermal power plant mainly comprises suspended matters, high-concentration sulfite, sulfate, chloride, fluoride and trace heavy metal ions (such as mercury, chromium, nickel, lead and the like), and the traditional desulfurization wastewater treatment process can adjust the pH value and remove heavy metals and suspended matters, but can not effectively control the chloride ions.
The country pays great attention to the pollution treatment of the water environment, puts strict limits on the discharge standard and the discharge total amount of the wastewater, and encourages enterprises to adopt various new water-saving technologies to carry out advanced treatment and recycling on various types of wastewater. Clear requirements of 'action plan for water pollution prevention and control' are issued 4, month and 2 days 2015, and the research and development of technologies for advanced wastewater treatment in key industries, industrial high-salinity wastewater desalination and the like are accelerated. As a main source of energy in China, thermal power plants generate large amount of desulfurization waste water, and because a desulfurization system has a large water circulation coefficient, chloride ions in the waste water are generally high. Too high content chloride ion can lead to the corrosivity increase of waste water, causes system's pipeline and equipment corrosion, influences equipment safety and system efficiency, and thermal power plant's desulfurization waste water is difficult to effective utilization. At present, the traditional chlorine reduction method achieves the purpose of reducing the concentration of chloride ions in a system by discharging certain waste water and supplementing fresh water, along with the issuance of ten national policies of water, the national emission requirement on high-salinity waste water is higher and higher, and the pressure of recycling waste water of a thermal power plant without discharging is higher and higher. In order to meet the requirement of zero emission of the desulfurization wastewater, the content of chloride ions in the wastewater needs to be reduced.
At present, in order to ensure the recycling of flue gas desulfurization wastewater of a thermal power plant, dechlorination equipment needs to be added, the content of chloride ions in the wastewater is reduced, a widely-applied process is a method of concentrating before heating and crystallizing, but the defects of unstable system operation, high energy consumption and large equipment investment exist no matter membrane concentration is carried out by using a filter membrane or heating, evaporating and concentrating are carried out, the loss of 0.1-0.3% of boiler thermal efficiency can be caused in the heating and crystallizing process, the wastewater can not be recycled by evaporation, and water resources are wasted. Therefore, a system and a process capable of reducing the concentration of chloride ions in flue gas desulfurization wastewater of a thermal power plant are needed.
Disclosure of Invention
The invention aims to provide a thermal power plant flue gas desulfurization waste water chlorine reduction recycling system which can effectively remove chloride ions in desulfurization waste water, simplify treatment equipment of desulfurization waste water and save treatment cost of desulfurization waste water. Meanwhile, the invention also provides a chlorine-reducing recycling process for the flue gas desulfurization wastewater of the thermal power plant, which can realize zero discharge of the flue gas desulfurization wastewater of the thermal power plant, reduce the content of chloride ions in the wastewater, reduce the corrosivity of the desulfurization wastewater, recycle the desulfurization wastewater and save water resources.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a flue gas desulfurization waste water of thermal power plant falls chlorine recycling system for reduce the content of chloride ion in the flue gas desulfurization waste water of thermal power plant, reduce corrosivity, protect circulating equipment and water equipment, realize the recycle of desulfurization waste water. The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system comprises a waste water tank, a triple box, a clarifier, a sludge dewatering device and a clear water tank. Desulfurization waste water gets into in the waste water tank along the pipeline and collects and stores, the triplex case is including neutralization box, reaction box and the settling tank that links to each other in order, the waste water tank is connected with neutralization box in the triplex case through the pipeline, settling tank in the triplex case is connected with the clarifier through the pipeline. The upper part of the clarifier is connected with the clear water tank through a pipeline, and the bottom of the clarifier is connected with a sludge dewatering device through a pipeline. The solid matter in the desulfurization waste water and the sediment generated by the reaction are primarily settled in a settling tank, then enter a clarifier for further settling separation, and the settled pollutants at the bottom of the clarifier form solid waste material after passing through a sludge dewatering device for discharge. Desulfurization waste water after handling in the clarifier gets into the clear water tank along the pipeline and collects, and the aquatic of collecting contains calcium hydroxide, can be used for thermal power plant's flue gas desulfurization, realizes the cyclic utilization of waste water.
Still be equipped with first feeder apparatus on the pipeline between neutralization box and the waste water tank, the reaction box top is equipped with the second and throws feeder apparatus, and the setting tank top is equipped with coagulant aid feeder apparatus, and first feeder apparatus, second are thrown feeder apparatus and coagulant aid feeder apparatus and are used for throwing into waste water treatment medicament and flocculation coagulant aid medicament to the triplex case, handle desulfurization waste water to reduce the chloride ion content in the waste water.
Utilize first throwing to throw feeder apparatus and second to throw and throw the medicament in neutralization case and the reaction box among the aforementioned thermal power plant flue gas desulfurization waste water chlorine reduction recycling system, first throwing is thrown the feeder apparatus and is included alkali dosing tank, organic sulfur dosing tank, flocculating agent dosing tank and three pipeline mixer who connects in order, alkali dosing tank, organic sulfur dosing tank and flocculating agent dosing tank are connected with a pipeline mixer respectively. The pipeline mixer can accelerate the mixing of the medicament in the pipeline, and improves the reaction efficiency of the wastewater in the neutralization tank. And adjusting the pH value of the wastewater in a neutralization tank, and removing most heavy metal ions, fluoride ions and sulfate ions. The second feeding device comprises an alkali metal hydroxide feeding box and an alkali metal metaaluminate feeding box, and the concentration of chloride ions in the wastewater is mainly reduced in the reaction box, so that the chlorine reduction recycling treatment is a main process.
The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system further comprises a limestone slurry tank and a desulfurization tower spray water tank, and the clear water tank is connected with the limestone slurry tank and the desulfurization tower spray water tank through a pipeline. The invention utilizes the clean water tank to collect the supernatant in the clarifier, the main components in the supernatant are calcium hydroxide and sodium hydroxide, and the supernatant can be used as a limestone slurry tank for collection and reuse, and also can be directly used for flue gas desulfurization of a thermal power plant and enters a spray water tank of a desulfurization tower.
The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system further comprises a pH value measuring instrument and a chloride ion measuring instrument, and is used for monitoring the reaction environment and the reaction effect, the pH value measuring instrument is arranged in the neutralization box, the total number of the chloride ion measuring instruments is two, the two chloride ion measuring instruments are respectively arranged in the neutralization box and the clear water box, and the chloride ion concentrations before and after treatment are recorded.
In order to prevent the produced water from meeting the use requirement, the clarifier is also connected with the neutralization tank through a pipeline, and after the water quality detection is carried out, if the produced water can not meet the use requirement, the water in the clarifier flows back into the neutralization tank through the pipeline to be treated again.
The device comprises a controller, wherein the controller is in signal connection with two chloride ion measuring instruments and is also in signal connection with a second feeding device, and the controller can obtain the chlorine reduction effect of the system according to the data of the two chloride ion measuring instruments, feed the chlorine reduction effect back to the second feeding device and adjust the feeding amount of a chlorine reduction agent.
The utility model provides a thermal power plant's flue gas desulfurization waste water falls chlorine recycling process, adopts aforementioned thermal power plant's flue gas desulfurization waste water to fall chlorine recycling system, includes the following step:
a. the desulfurization wastewater enters a wastewater tank along a pipeline for collection, so as to provide conditions for the subsequent treatment process;
b. the desulfurization wastewater in the wastewater tank enters a triple box after passing through a first adding device in a pipeline;
c. the desulfurization wastewater overflows into a reaction box after passing through a neutralization box, alkali metal hydroxide and alkali metal metaaluminate are added into the reaction box through a second adding device, the pH value in the reaction box is adjusted, chloride ions in the desulfurization wastewater are removed, and precipitated calcium chloroaluminate is generated;
d. the desulfurization wastewater enters a settling tank, and a coagulant aid adding device is used for adding the coagulant aid into the settling tank, so that calcium chloroaluminate generated in the wastewater precipitates and impurities form larger particles, and the particles are condensed and settled;
e. the desulfurization wastewater enters a clarifier through a pipeline for clarification;
f. supernatant in the clarifier enters a clear water tank along a pipeline to be collected, bottom sediment in the clarifier enters a sludge dewatering device, and after dewatering treatment, filter cakes are transported and discharged.
In the step b of the thermal power plant desulfurization wastewater chlorine reduction recycling process, alkali liquor, alkali metal organic sulfur and a flocculating agent are sequentially added into a pipeline between a wastewater box and a triple box by a first adding device, the alkali liquor added by an alkali adding box is lime milk liquid and sodium hydroxide, the pH value range of the alkali liquor in the neutralizing box is adjusted to be 9-10, most of heavy metal ions are dissolved in the wastewater under an acid environment, the alkali liquor is added to increase the pH value, the heavy metal ions can form precipitates in the form of hydroxides, the heavy metal ions in the wastewater are preliminarily removed, meanwhile, calcium ions in the lime milk liquid can also react with fluoride ions and sulfate ions in the flue gas desulfurization wastewater to generate calcium fluoride precipitates and calcium sulfate precipitates, and the concentrations of the fluoride ions and the sulfate ions in the wastewater are reduced. The adding amount of alkali metal organic sulfur in the organic sulfur dosing box is 1.13-1.69 times of the concentration of iron in the wastewater according to the equivalent sulfur element, and the organic sulfur can be combined with heavy metal ions to form stable organic metal compound precipitate so as to further remove the heavy metal ions in the wastewater. The flocculant adding range of the flocculant adding box is 100mg/L-150mg/L, under the action of alkali liquor and organic sulfur, more precipitates are generated in the desulfurization wastewater, colloids and fine suspended matters in the wastewater can be aggregated into flocs with separable characteristics by adding the flocculant, and the sedimentation process is accelerated.
And c, adding alkali metal hydroxide and alkali metal meta-aluminate into the reaction box by a second adding device, controlling the pH value of the wastewater in the reaction box to be 11-12, and controlling the adding amount of the alkali metal meta-aluminate to be 2-5 times of the molar concentration of the chloride ions in the wastewater. In the reaction box, chloride ions generate calcium chloroaluminate precipitate to realize the removal of chloride ions.
In the step f of the thermal power plant desulfurization wastewater chlorine reduction recycling process, the supernatant in the clarifier enters the clear water tank to be collected, the supernatant collected in the clear water tank mainly contains calcium hydroxide and sodium hydroxide, and the supernatant can be collected as limestone slurry or directly used for thermal power plant flue gas desulfurization, so that the desulfurization wastewater is recycled.
Compared with the prior art, the invention has the advantages that: the utility model provides a flue gas desulfurization waste water of thermal power plant falls chlorine recycling system need not additionally to add the dechlorination system, can effectively get rid of the heavy metal ion in the flue gas desulfurization waste water of thermal power plant, and harmful substance, solid impurity and chloride ion reduce the corrosivity of desulfurization waste water, realize waste water recycle in the flue gas desulfurization system of thermal power plant, and this system improves in original flue gas desulfurization waste water treatment system of thermal power plant, reforms transform with low costsly. Meanwhile, the pipeline mixer is arranged to add the medicament into the wastewater, so that the mixing degree of the medicament in the wastewater is effectively improved, and the wastewater treatment efficiency is improved. The invention also provides a chlorine reduction recycling process for the flue gas desulfurization wastewater of the thermal power plant, which utilizes alkali metal meta-aluminate to remove chloride ions in the flue gas desulfurization wastewater of the thermal power plant, simplifies the treatment process, combines the treated wastewater with the desulfurization process, achieves the recycling of the wastewater, and saves the operation cost of a flue gas desulfurization wastewater treatment system of the thermal power plant.
Drawings
FIG. 1 is a schematic flow chart of the operation of the present invention;
FIG. 2 is a schematic view showing the operation of a conventional desulfurization waste water treatment technique.
The meaning of the reference numerals: 1-a wastewater tank, 2-a three-header tank, 3-a clarifier, 4-a sludge dewatering device, 5-a clear water tank, 6-a neutralization tank, 7-a reaction tank, 8-a settling tank, 9-a first adding device, 10-a second adding device, 11-a coagulant aid adding device, 12-an alkali adding tank, 13-an organic sulfur adding tank, 14-a flocculating agent adding tank, 15-an alkali metal hydroxide adding tank, 16-an alkali metal metaaluminate adding tank, 17-a limestone slurry tank, 18-a desulfurizing tower spraying water tank, 19-a pH value measuring instrument, 20-a chloride ion measuring instrument, 21-a controller and 22-a pipeline mixer.
The invention is further described with reference to the following figures and detailed description.
Detailed Description
Example 1 of the invention: the utility model provides a flue gas desulfurization waste water of thermal power plant falls chlorine recycling system for reduce the content of chlorion in the flue gas desulfurization waste water of thermal power plant, reduce the corrosivity of desulfurization waste water, make the desulfurization waste water can recycle in the flue gas desulfurization of thermal power plant. As shown in fig. 1, the thermal power plant flue gas desulfurization wastewater chlorine reduction recycling system comprises a wastewater tank 1, a triple box 2, a clarifier 3, a sludge dewatering device 4 and a clean water tank 5. Waste water tank 1 is used for collecting desulfurization waste water, triple box 2 is including continuous neutralization box 6, reaction box 7 and settling tank 8 in order, and desulfurization waste water accomplishes main processing process in triple box 2. The waste water tank 1 is connected with a neutralizing tank 6 in the triple box 2 through a pipeline, a settling tank 8 in the triple box 2 is connected with the clarifier 3 through a pipeline, the upper part of the clarifier 3 is connected with a clear water tank 5 through a pipeline, and the bottom of the clarifier 3 is connected with a sludge dewatering device 4 through a pipeline. Solid impurities in the desulfurization wastewater and precipitates generated by the treatment reaction are primarily settled in a settling tank 8, and are finally settled and separated in a clarifier 3. The pollutant that subsides of clarifier 3 bottom forms solid waste behind sludge dewatering device 4, and the filter cake discharges to the external world, and the supernatant in the clarifier 3 gets into clear water tank 5 along the pipeline and collects, and the aquatic of collecting contains calcium hydroxide, can be used for thermal power plant's flue gas desulfurization, realizes the cyclic utilization of desulfurization waste water.
As shown in figure 1, a first adding device 9 is further arranged on a pipeline between the neutralization tank 6 and the wastewater tank 1, a second adding device 10 is arranged above the reaction tank 7, and a coagulant aid adding device 11 is arranged above the settling tank 8. The first adding device 9, the second adding device 10 and the coagulant aid adding device 11 are used for adding a reagent required by desulfurization wastewater treatment and a flocculation coagulant aid for assisting sedimentation into the triple box 2, the desulfurization wastewater treatment is completed in the triple box 2, the chloride ion content in the wastewater is reduced, and the desulfurization wastewater can be reused for flue gas desulfurization of a thermal power plant.
As shown in fig. 1, the first adding apparatus 9 according to the present embodiment includes an alkali adding tank 12, an organic sulfur adding tank 13, a flocculant adding tank 14, and three line mixers 22 connected in sequence, wherein the alkali adding tank 12, the organic sulfur adding tank 13, and the flocculant adding tank 14 are connected to one line mixer 22, respectively, and the line mixer 22 can accelerate mixing of the chemical and the desulfurization wastewater in the line, thereby improving the reaction efficiency of the wastewater in the neutralization tank 6. The pH of the wastewater is adjusted in the neutralization tank 6 and most of the heavy metal ions, fluoride ions and sulfate ions are removed. The second feeding device 10 comprises an alkali metal hydroxide feeding box 15 and an alkali metal meta-aluminate feeding box 16, the alkali metal meta-aluminate is used for absorbing chloride ions in the desulfurization wastewater, and the treatment process in the reaction box 7 is the main process of the chlorine reduction treatment of the desulfurization wastewater.
As shown in fig. 1, the present embodiment further includes a limestone slurry tank 17 and a desulfurization tower spray water tank 18, and the clear water tank 5 is connected to the limestone slurry tank 17 and the desulfurization tower spray water tank 18 through a pipeline. After treatment, the main components in the desulfurization wastewater are calcium hydroxide and sodium hydroxide, main impurities and pollutants are basically removed, the content of chloride ions is reduced, the corrosivity is reduced, and the limestone slurry can be collected or directly used for spray desulfurization of a desulfurization tower to realize water resource recycling. In the actual production process, the pH value in the desulfurizing tower influences the desulfurizing efficiency, if the pH value is too high, the absorption of oxysulfide can be accelerated, but limestone dissolution is not facilitated, if the pH value is too low, limestone dissolution is facilitated, but the absorption efficiency of oxysulfide is reduced, the final desulfurizing effect is influenced, the pH value of the desulfurizing tower is generally controlled to be 5-6, when the pH value in the desulfurizing tower is more than 6, the treated wastewater is not discharged into a desulfurizing tower spray water tank 18, the pH value is prevented from being further increased, and the treated wastewater can be discharged into a limestone slurry tank 17 for collection.
As shown in fig. 1, in this embodiment, in order to improve the system control capability, the system further includes a pH value measuring instrument 19 and two chloride ion measuring instruments 20, the pH value measuring instrument 19 is disposed in the neutralization tank 6 to monitor the reaction environment in the neutralization tank 6, and the two chloride ion measuring instruments 20 are disposed in the neutralization tank 6 and the clean water tank 5, respectively, and are used for recording the changes in the chloride ion concentration before and after the treatment.
Example 2 of the invention: as shown in fig. 1, this example is used for treating gypsum filtrate from flue gas desulfurization in a thermal power plant. The natural gypsum contains more impurities and chlorides, the gypsum filtrate can not be directly used for flue gas desulfurization of a thermal power plant, and the gypsum filtrate can be treated by the embodiment to meet the use requirement.
As shown in figure 1, the system for reducing chlorine and recycling the thermal power plant flue gas desulfurization wastewater is used for reducing the content of chloride ions in gypsum filtrate and reducing the corrosivity of the gypsum filtrate, so that the gypsum filtrate meets the use requirement of thermal power plant flue gas desulfurization. The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system comprises a waste water tank 1, a triple box 2, a clarifier 3, a sludge dewatering device 4 and a clear water tank 5. Waste water case 1 is used for collecting the gypsum filtrating, triplex case 2 is including continuous neutralization box 6, reaction box 7 and settling tank 8 in order, and the gypsum filtrating accomplishes main processing procedure in triplex case 2. The waste water tank 1 is connected with a neutralizing tank 6 in the triple box 2 through a pipeline, a settling tank 8 in the triple box 2 is connected with the clarifier 3 through a pipeline, the upper part of the clarifier 3 is connected with a clear water tank 5 through a pipeline, and the bottom of the clarifier 3 is connected with a sludge dewatering device 4 through a pipeline. The solid impurities in the gypsum filtrate and the precipitate from the treatment reaction are subjected to a preliminary sedimentation in a sedimentation tank 8 and a final sedimentation separation in a clarifier 3. The pollutant that subsides of clarifier 3 bottom forms solid waste behind sludge dewatering device 4, and the filter cake discharges to the external world, and the supernatant in clarifier 3 gets into clear water tank 5 along the pipeline and collects, and the principal ingredients in the aquatic of collecting is calcium hydroxide, can be used for thermal power plant's flue gas desulfurization.
As shown in figure 1, a first adding device 9 is further arranged on a pipeline between the neutralization tank 6 and the wastewater tank 1, a second adding device 10 is arranged above the reaction tank 7, and a coagulant aid adding device 11 is arranged above the settling tank 8. The first adding device 9, the second adding device 10 and the coagulant aid adding device 11 are used for adding a medicament required by gypsum filtrate treatment and a flocculation coagulant aid for assisting sedimentation into the triple box 2, the gypsum filtrate treatment is completed in the triple box 2, and the chloride ion content in the gypsum filtrate is reduced, so that the gypsum filtrate meets the flue gas desulfurization requirement of a thermal power plant.
As shown in fig. 1, the first adding apparatus 9 according to the present embodiment includes an alkali adding tank 12, an organic sulfur adding tank 13, a flocculant adding tank 14, and three line mixers 22 connected in sequence, wherein the alkali adding tank 12, the organic sulfur adding tank 13, and the flocculant adding tank 14 are connected to one line mixer 22, respectively, and the line mixer 22 can accelerate mixing of the chemicals and the gypsum filtrate in the line, thereby improving the reaction efficiency of the gypsum filtrate in the neutralization tank 6. The pH of the gypsum filtrate is adjusted in the neutralization tank 6 and the majority of heavy metal ions, fluoride ions and sulfate ions are removed. The second feeding device 10 comprises an alkali metal hydroxide feeding box 15 and an alkali metal meta-aluminate feeding box 16, the alkali metal meta-aluminate is used for absorbing chloride ions in the gypsum filtrate, and the treatment process in the reaction box 7 is the main process of the gypsum filtrate chlorine reduction treatment.
As shown in fig. 1, the present embodiment further includes a limestone slurry tank 17 and a desulfurization tower spray water tank 18, and the clear water tank 5 is connected to the limestone slurry tank 17 and the desulfurization tower spray water tank 18 through a pipeline. After treatment, the main components in the gypsum filtrate are calcium hydroxide and sodium hydroxide, main impurities and pollutants in the gypsum filtrate are basically removed, the content of chloride ions is reduced, the corrosivity is reduced, and the gypsum filtrate can be used as limestone slurry for collection or directly used for spray desulfurization of a desulfurizing tower, so that the water resource recycling is realized.
As shown in fig. 1, in this embodiment, in order to improve the system control capability, the system further includes a pH value measuring instrument 19 and two chloride ion measuring instruments 20, the pH value measuring instrument 19 is disposed in the neutralization tank 6 to monitor the reaction environment in the neutralization tank 6, and the two chloride ion measuring instruments 20 are disposed in the neutralization tank 6 and the clean water tank 5, respectively, and are used for recording the changes in the chloride ion concentration before and after the treatment.
As shown in fig. 1, in order to prevent the supernatant of the clarifier 3 from reaching the use requirement, the clarifier 3 described in this embodiment is further connected with a neutralization tank 6 through a pipeline. After detection, if the produced water cannot be directly used for flue gas desulfurization of the thermal power plant, the water in the clarifier 3 flows back to the neutralization tank 6 through a pipeline for treatment again.
As shown in fig. 1, the present embodiment further includes a controller 21, the controller 21 is in signal connection with the chloride ion measuring instrument 20, the controller 21 is also in signal connection with the second adding device 10, and the controller 21 can obtain the chlorine reducing effect of the system according to the data of the two chloride ion measuring instruments 20, and feed back the chlorine reducing effect to the second adding device 10 to adjust the adding amount of the chlorine reducing agent.
Example 3 of the invention: the utility model provides a thermal power plant's flue gas desulfurization waste water falls chlorine recycling process, adopts aforementioned thermal power plant's flue gas desulfurization waste water to fall chlorine recycling system, includes the following step:
a. the desulfurization wastewater enters a wastewater tank 1 along a pipeline for collection, so as to provide conditions for the subsequent treatment process;
b. the desulfurization wastewater in the wastewater tank 1 enters the triple box 2 after passing through a first adding device 9 in a pipeline;
c. the desulfurization wastewater overflows into a reaction box 7 after passing through a neutralization box 6, alkali metal hydroxide and alkali metal metaaluminate are added into the reaction box 7 through a second adding device 10, the pH value in the reaction box 7 is adjusted, chloride ions in the desulfurization wastewater are removed, and precipitated calcium chloroaluminate is generated;
d. the desulfurization wastewater enters a settling tank 8, and coagulant aid is added into the settling tank 8 by a coagulant aid adding device 11, so that calcium chloroaluminate precipitate and impurities generated in the wastewater form larger particles, and the particles are coagulated and settled;
e. the desulfurization wastewater enters a clarifier 3 through a pipeline for clarification, and the supernatant of the clarifier 3 is detected;
f. supernatant in the clarifier 3 enters a clear water tank 5 along a pipeline for collection, bottom sediment in the clarifier 3 enters a sludge dewatering device 4, and after dewatering treatment, filter cakes are transported and discharged.
In the foregoing step b of this embodiment, the first adding device 9 sequentially adds alkali liquor, alkali metal organic sulfur and a flocculant into the pipeline between the wastewater tank 1 and the triple box 2, the alkali liquor added by the alkali adding tank 12 is lime milk liquor and sodium hydroxide, the pH value adjusted to the neutralization tank 6 is 9, most of heavy metal ions are dissolved in the wastewater in an acidic environment, the alkali liquor is added to increase the pH value, the heavy metal ions can form a precipitate in the form of hydroxide, the heavy metal ions in the wastewater are preliminarily removed, and meanwhile, calcium ions in the lime milk liquor can also react with fluoride ions and sulfate ions in the flue gas desulfurization wastewater to generate calcium fluoride precipitate and calcium sulfate precipitate, so as to reduce the concentrations of the fluoride ions and the sulfate ions in the wastewater. The addition amount of alkali metal organic sulfur in the organic sulfur dosing tank 13 is 1.13 times of the concentration of iron element in the wastewater, and the organic sulfur can be combined with heavy metal ions to form stable organic metal compound precipitate, so that the heavy metal ions in the wastewater are further removed. The flocculating agent dosage added by the flocculating agent adding box 14 is 100mg/L, under the action of alkali liquor and organic sulfur, more precipitates are generated in the desulfurization wastewater, colloid and fine suspended matters in the wastewater can be gathered into flocculates with separable characteristics by adding the flocculating agent, and the settling process is accelerated.
In step c, the second adding device 10 adds alkali metal hydroxide and alkali metal meta-aluminate into the reaction tank 7, the pH of the wastewater in the reaction tank 7 is controlled to be 11, and the adding amount of the alkali metal meta-aluminate is 2 times of the molar concentration of chloride ions in the wastewater.
In the step f described in this embodiment, the supernatant in the clarifier 3 enters the clear water tank 5 to be collected, the main components of the supernatant in the clear water tank 5 are calcium hydroxide and sodium hydroxide, and the supernatant enters the limestone slurry tank 17 or the spray water tank 18 of the desulfurization tower through a pipeline to be reused.
Example 4 of the invention: the utility model provides a thermal power plant's flue gas desulfurization waste water falls chlorine recycling process, adopts aforementioned thermal power plant's flue gas desulfurization waste water to fall chlorine recycling system, includes the following step:
a. the desulfurization wastewater enters a wastewater tank 1 along a pipeline for collection, so as to provide conditions for the subsequent treatment process;
b. the desulfurization wastewater in the wastewater tank 1 enters the triple box 2 after passing through a first adding device 9 in a pipeline;
c. the desulfurization wastewater overflows into a reaction box 7 after passing through a neutralization box 6, alkali metal hydroxide and alkali metal metaaluminate are added into the reaction box 7 through a second adding device 10, the pH value in the reaction box 7 is adjusted, chloride ions in the desulfurization wastewater are removed, and precipitated calcium chloroaluminate is generated;
d. the desulfurization wastewater enters a settling tank 8, and coagulant aid is added into the settling tank 8 by a coagulant aid adding device 11, so that calcium chloroaluminate precipitate and impurities generated in the wastewater form larger particles, and the particles are coagulated and settled;
e. the desulfurization wastewater enters a clarifier 3 through a pipeline for clarification, and the supernatant of the clarifier 3 is detected;
f. supernatant in the clarifier 3 enters a clear water tank 5 along a pipeline for collection, bottom sediment in the clarifier 3 enters a sludge dewatering device 4, and after dewatering treatment, filter cakes are transported and discharged.
In the foregoing step b of this embodiment, the first adding device 9 sequentially adds alkali liquor, alkali metal organic sulfur and a flocculant into the pipeline between the wastewater tank 1 and the triple box 2, the alkali liquor added by the alkali adding tank 12 is lime milk liquor and sodium hydroxide, the pH value adjusted to the neutralization tank 6 is 10, most of heavy metal ions are dissolved in the wastewater in an acidic environment, the alkali liquor is added to increase the pH value, the heavy metal ions can form a precipitate in the form of hydroxide, the heavy metal ions in the wastewater are preliminarily removed, and meanwhile, calcium ions in the lime milk liquor can also react with fluoride ions and sulfate ions in the flue gas desulfurization wastewater to generate calcium fluoride precipitate and calcium sulfate precipitate, so as to reduce the concentrations of the fluoride ions and the sulfate ions in the wastewater. The addition amount of the alkali metal organic sulfur in the organic sulfur dosing tank 13 is 1.69 times of the concentration of the iron element in the wastewater according to the sulfur element, and the organic sulfur can be combined with heavy metal ions to form stable organic metal compound precipitate so as to further remove the heavy metal ions in the wastewater. The flocculating agent dosage added by the flocculating agent adding box 14 is 150mg/L, under the action of alkali liquor and organic sulfur, more precipitates are generated in the desulfurization wastewater, colloid and fine suspended matters in the wastewater can be gathered into flocculates with separable characteristics by adding the flocculating agent, and the settling process is accelerated.
In step c, the second adding device 10 adds alkali metal hydroxide and alkali metal meta-aluminate into the reaction tank 7, the pH of the wastewater in the reaction tank 7 is controlled to be 12, and the adding amount of the alkali metal meta-aluminate is 5 times of the molar concentration of chloride ions in the wastewater.
In the step f described in this embodiment, the supernatant in the clarifier 3 enters the clear water tank 5 to be collected, the main components of the supernatant in the clear water tank 5 are calcium hydroxide and sodium hydroxide, and the supernatant enters the limestone slurry tank 17 or the spray water tank 18 of the desulfurization tower through a pipeline to be reused.
The working principle of the invention is as follows: as shown in fig. 2, the thermal power plant flue gas desulfurization wastewater chlorine reduction recycling system is modified on the basis of an original desulfurization wastewater treatment system, desulfurization wastewater is treated by using the triple box 2, and most pollutants and chloride ions are removed in the neutralization box 6 and the reaction box 7. Heavy metal ions in the desulfurization wastewater form precipitates by means of pH value adjustment and organic sulfur addition, chloride ions form precipitates by means of alkali metal meta-aluminate addition, solid-liquid separation of the desulfurization wastewater can be realized through a settling tank 8 and a clarifier 3, main components in supernatant are calcium hydroxide and sodium hydroxide, the calcium hydroxide and the sodium hydroxide can be collected as limestone slurry or directly used for flue gas desulfurization of a thermal power plant, the limestone slurry is recycled through a clear water tank 6 and then returns to a flue gas desulfurization system of the thermal power plant, the solid precipitates in the clarifier 3 enter a sludge dewatering device 4 to be compressed and filtered, solid waste filter cakes are formed, and the solid waste filter cakes are transported and discharged. Zero release treatment is realized to thermal power plant's flue gas desulfurization waste water, owing to reduced the concentration of chloride ion, corrosivity descends, and the supernatant in clarifier 3 can direct retrieval and utilization, need not to set up the dechlorination system alone.
Claims (10)
1. The utility model provides a flue gas desulfurization waste water of thermal power plant falls chlorine recycling system for reduce the content of chlorion in the flue gas desulfurization waste water of thermal power plant, its characterized in that: the device comprises a waste water tank (1), a triple box (2), a clarifier (3), a sludge dewatering device (4) and a clean water tank (5), wherein the triple box (2) comprises a neutralization tank (6), a reaction tank (7) and a settling tank (8) which are connected in sequence, the waste water tank (1) is connected with the neutralization tank (6) in the triple box (2) through a pipeline, the settling tank (8) in the triple box (2) is connected with the clarifier (3) through a pipeline, the upper part of the clarifier (3) is connected with the clean water tank (5) through a pipeline, and the bottom of the clarifier (3) is connected with the sludge dewatering device (4) through a pipeline; a first adding device (9) is further arranged on a pipeline between the neutralization box (6) and the wastewater box (1), a second adding device (10) is arranged above the reaction box (7), and a coagulant aid adding device (11) is arranged above the settling box (8).
2. The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system of claim 1, characterized in that: the first adding device (9) comprises an alkali adding box (12), an organic sulfur adding box (13), a flocculating agent adding box (14) and three pipeline mixers (22) which are sequentially connected, wherein the alkali adding box (12), the organic sulfur adding box (13) and the flocculating agent adding box (14) are respectively connected with one pipeline mixer (22); the second feeding device (10) comprises an alkali metal hydroxide feeding box (15) and an alkali metal metaaluminate feeding box (16).
3. The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system according to claim 1 or 2, characterized in that: the system is characterized by further comprising a limestone slurry tank (17) and a desulfurizing tower spray water tank (18), wherein the clear water tank (5) is connected with the limestone slurry tank (17) and the desulfurizing tower spray water tank (18) through pipelines.
4. The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system according to claim 1 or 2, characterized in that: the device is characterized by further comprising a pH value measuring instrument (19) and two chloride ion measuring instruments (20), wherein the pH value measuring instrument (19) is arranged in the neutralization box (6), and the two chloride ion measuring instruments (20) are respectively arranged in the neutralization box (6) and the clear water box (5).
5. The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system of claim 4, characterized in that: the clarifier (3) is also connected with a neutralization tank (6) through a pipeline.
6. The thermal power plant flue gas desulfurization waste water chlorine reduction recycling system of claim 4, characterized in that: the device is characterized by further comprising a controller (21), wherein the controller (21) is in signal connection with the chloride ion measuring instrument (20), and the controller (21) is also in signal connection with the second feeding device (10).
7. A thermal power plant flue gas desulfurization waste water chlorine reduction recycling process adopts the thermal power plant flue gas desulfurization waste water chlorine reduction recycling system of any one of claims 1 to 6, and is characterized by comprising the following steps:
a. the desulfurization wastewater enters a wastewater tank (1) along a pipeline for collection, so as to provide conditions for the subsequent treatment process;
b. desulfurization wastewater in the wastewater tank (1) enters the triple box (2) after passing through a first adding device (9) in a pipeline;
c. the desulfurization wastewater overflows into a reaction box (7) after passing through a neutralization box (6), alkali metal hydroxide and alkali metal metaaluminate are added into the reaction box (7) through a second adding device (10), the pH value in the reaction box (7) is adjusted, chloride ions in the desulfurization wastewater are removed, and precipitated calcium chloroaluminate is generated;
d. the desulfurization wastewater enters a settling tank (8), and coagulant aid is added into the settling tank (8) by a coagulant aid adding device (11), so that calcium chloroaluminate generated in the wastewater precipitates and impurities form larger particles, and the particles are condensed and settled;
e. the desulfurization wastewater enters a clarifier (3) through a pipeline for clarification, and the supernatant of the clarifier (3) is detected;
f. supernatant in the clarifier (3) enters a clear water tank (5) along a pipeline for collection, bottom sediment in the clarifier (3) enters a sludge dewatering device (4), and after dewatering treatment, filter cakes are transported and discharged.
8. The thermal power plant flue gas desulfurization wastewater chlorine reduction recycling process according to claim 7, characterized in that: in the step b, a first adding device (9) sequentially adds alkali liquor, alkali metal organic sulfur and a flocculating agent into a pipeline between the wastewater box (1) and the triple box (2), wherein the alkali liquor added by the alkali adding box (12) is lime milk liquid and sodium hydroxide, and the pH value in the neutralization box (6) is adjusted to be 9-10; the adding amount range of the alkali metal organic sulfur in the organic sulfur dosing tank (13) is 1.13-1.69 times of the concentration of iron element in the wastewater corresponding to sulfur element; the flocculant adding range of the flocculant adding box (14) is 100mg/L-150 mg/L.
9. The thermal power plant flue gas desulfurization wastewater chlorine reduction recycling process according to claim 7, characterized in that: in the step c, adding alkali metal hydroxide and alkali metal meta-aluminate into the reaction box (7) by a second adding device (10), controlling the pH value of the wastewater in the reaction box (7) to be 11-12, and controlling the adding amount of the alkali metal meta-aluminate to be 2-5 times of the molar concentration of chloride ions in the wastewater.
10. The thermal power plant flue gas desulfurization wastewater chlorine reduction recycling process according to claim 7, characterized in that: and in the step f, the supernatant in the clarifier (3) enters a clear water tank (5) for collection, and the supernatant in the clear water tank (5) enters a limestone slurry tank (17) or a spray water tank (18) of a desulfurizing tower through a pipeline for reutilization.
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| CN114262097A (en) * | 2021-12-16 | 2022-04-01 | 西安西热水务环保有限公司 | Wastewater dechlorination system and method based on electrolytic aluminum coupling chemical precipitation |
| CN114262097B (en) * | 2021-12-16 | 2023-11-21 | 西安西热水务环保有限公司 | Electrolytic aluminum coupling chemical precipitation wastewater chlorine removal system and method |
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