CN114455761A - Method for treating industrial wastewater by using power generation flue gas waste heat - Google Patents
Method for treating industrial wastewater by using power generation flue gas waste heat Download PDFInfo
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- CN114455761A CN114455761A CN202111422425.8A CN202111422425A CN114455761A CN 114455761 A CN114455761 A CN 114455761A CN 202111422425 A CN202111422425 A CN 202111422425A CN 114455761 A CN114455761 A CN 114455761A
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- flue gas
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- 238000000034 method Methods 0.000 title claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003546 flue gas Substances 0.000 title claims abstract description 47
- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 36
- 238000010248 power generation Methods 0.000 title claims abstract description 23
- 239000002918 waste heat Substances 0.000 title claims abstract description 20
- 239000002351 wastewater Substances 0.000 claims abstract description 119
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 63
- 230000023556 desulfurization Effects 0.000 claims abstract description 63
- 229920000642 polymer Polymers 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 5
- 239000012991 xanthate Substances 0.000 claims description 5
- 239000003945 anionic surfactant Substances 0.000 claims description 4
- 150000007942 carboxylates Chemical class 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 239000002736 nonionic surfactant Substances 0.000 claims description 4
- 239000000149 chemical water pollutant Substances 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 abstract description 45
- 230000008020 evaporation Effects 0.000 abstract description 44
- 239000002245 particle Substances 0.000 abstract description 21
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 239000003500 flue dust Substances 0.000 description 16
- 239000002956 ash Substances 0.000 description 15
- 239000010881 fly ash Substances 0.000 description 12
- 239000000779 smoke Substances 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 8
- 239000003814 drug Substances 0.000 description 8
- 238000003860 storage Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 4
- 229920002125 Sokalan® Polymers 0.000 description 4
- 239000004584 polyacrylic acid Substances 0.000 description 4
- 239000000176 sodium gluconate Substances 0.000 description 4
- 229940005574 sodium gluconate Drugs 0.000 description 4
- 235000012207 sodium gluconate Nutrition 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000001509 sodium citrate Substances 0.000 description 2
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 235000012247 sodium ferrocyanide Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- 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
Landscapes
- 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)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
According to the invention, the process regulator is applied to the treatment of the industrial wastewater by using the waste heat of the power generation flue gas for the first time, the industrial wastewater and the process regulator are uniformly mixed, and then the industrial wastewater added with the process regulator is sprayed into an evaporator or a flue of a power generation boiler system of a power plant, so that the problem that the desulfurization wastewater is difficult to clean after being solidified in the evaporation process of the flue can be effectively solved. The process regulator can change the crystallization process and surface adhesion of the particles in the solution, so that the crystallized particles become fine and are not easy to aggregate into large particles, and the particles are effectively prevented from being solidified. The crystallized particles of the particles become fine, the bonding force between the particles becomes extremely weak, the particles are not easy to aggregate into massive particles, the particles are not easy to precipitate and adhere to the surface of the evaporator, and the cleanliness of the surface of the evaporator is improved, so that the heat conduction efficiency is improved, and the wastewater is easier to evaporate to dryness quickly under the working condition of medium and low temperature (100 ℃ -380 ℃).
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a method for treating industrial wastewater by using power generation flue gas waste heat.
Background
The types of power plants are many, such as coal-fired, gas-fired, garbage-incinerated, etc., and with the promulgation and implementation of various national environmental regulations and water-saving plans, the treatment work of the industrial wastewater faces huge pressure. The traditional treatment method can not meet the requirements of environmental protection laws and policies.
Although the prior art scheme can realize the requirement of wastewater treatment, the prior art scheme has huge problems in the operation process: when industrial wastewater, particularly desulfurization wastewater, is sprayed back into a main flue or a wastewater evaporation tower for evaporation, the total dissolved solids can not enter a dust remover along with flue gas after the moisture is evaporated to dryness, most of the total dissolved solids can be separated out on the inner wall to form large-area hard blocks, so that the operating condition of the system is rapidly worsened, a spray gun can be blocked while the flue is blocked, the atomization effect is influenced, and the system is finally stopped to influence normal production. The prior technical scheme can not process the desulfurization wastewater and ensure the stable and continuous production operation of the system.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art, provides a method for treating industrial wastewater by using power generation flue gas waste heat, and effectively solves the problem that the industrial wastewater, particularly desulfurization wastewater, is difficult to clean after being hardened in the flue evaporation process.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a method for treating industrial wastewater by utilizing power generation flue gas waste heat.
Specifically, the process regulator is uniformly mixed with the industrial wastewater in the wastewater tank through a dosing device, and then is sprayed into an evaporator or a flue together.
Specifically, the process regulator is uniformly mixed with the industrial wastewater in a pipeline mixer through a dosing device, and then is sprayed into an evaporator or a flue together.
Specifically, the industrial wastewater comprises one or a mixture of more than two of desulfurization wastewater, circulating water concentrated water, desalted water concentrated water and landfill leachate.
Specifically, the process regulator is one or a mixture of more of xanthate, surfactant, polymer and organic carboxylate.
Preferably, the surfactant is an anionic surfactant and/or a nonionic surfactant.
Preferably, the polymer has a number average molecular weight of 1200 or less and a molecular weight distribution index of 2.5 or less.
The invention also claims a process regulator for treating industrial wastewater by using the waste heat of the power generation flue gas, wherein the process regulator is one or a mixture of more of xanthate, surfactant, polymer and organic carboxylate.
Preferably, the surfactant is an anionic surfactant and/or a nonionic surfactant.
Preferably, the polymer has a number average molecular weight of 1200 or less and a molecular weight distribution index of 2.5 or less.
Has the advantages that:
according to the invention, the process regulator is applied to the treatment of the industrial wastewater by using the waste heat of the power generation flue gas for the first time, the industrial wastewater and the process regulator are uniformly mixed, and then the industrial wastewater added with the process regulator is sprayed into an evaporator or a flue of a power generation boiler system of a power plant, so that the problem that the desulfurization wastewater is difficult to clean after being solidified in the evaporation process of the flue can be effectively solved. The process regulator can change the crystallization process and the surface adhesion of the particles in the solution, so that the crystallized particles become fine and are not easy to aggregate into large particles, and the particles are effectively prevented from being solidified. The crystallized particles of the particles become fine, the bonding force between the particles becomes extremely weak, the particles are not easy to aggregate into massive particles, the particles are not easy to precipitate and adhere to the surface of the evaporator, and the cleanliness of the surface of the evaporator is improved, so that the heat conduction efficiency is improved, and the wastewater is easier to evaporate to dryness quickly under the working condition of medium and low temperature (100 ℃ -380 ℃).
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic diagram showing the overall structure of a power plant wastewater system of the present invention using high-temperature flue gas for evaporation.
FIG. 2 is a hard block cleaned up in the wastewater evaporation tower before the process modifier is added.
FIG. 3 shows the discharge condition of the wastewater evaporation tower after fatty alcohol-polyoxyethylene ether sulfate is added into the desulfurization wastewater.
FIG. 4 shows the discharge of the wastewater evaporation tower after adding the xanthate to the desulfurization wastewater.
FIG. 5 shows the discharge of the wastewater evaporation tower after adding polyacrylic acid to the desulfurization wastewater.
FIG. 6 shows the discharge of the wastewater evaporation tower after the addition of sodium gluconate to the desulfurized wastewater.
FIG. 7 shows the discharge of the wastewater evaporation tower after adding sodium citrate and polyacrylic acid to the desulfurized wastewater.
FIG. 8 shows the discharge of the desulfurized wastewater with sodium gluconate and sodium dodecylbenzenesulfonate added thereto.
Wherein each reference numeral represents:
10 power plant boilers; 20 a denitration device; 30 air preheater; 40 main flue dust remover; 50 a wet desulfurization tower; 60, a chimney; 70, a main flue; 701, a main flue gate; 702 a first bypass flue; 703 smoke inlet gate; 704 a second bypass flue; 705 a smoke outlet gate; 80 a waste water evaporation tower; an ash hopper with 81 rows; 90 bypass flue dust collector; 100, a medicine adding device; 101 a medicament cartridge; 102 a dosing line; 103 a metering pump; 104 ball valve; 105 an electric cabinet; a 106Y filter; 107 back pressure valve; 200 waste water back-spraying conveying pipeline; 201 a desulfurization waste water storage tank; 202 a desulfurization waste water conveying pipeline; 203, a regulating pool; 204, a desulfurization wastewater efflux pump; 205 mixer.
Detailed Description
The invention will be better understood from the following examples.
Taking desulfurization wastewater of a certain power plant as an example, the invention provides application of a process regulator in treating industrial wastewater by using power generation flue gas waste heat.
As shown in FIG. 1, the anti-blocking system for power plant wastewater evaporation by using high temperature flue gas of the present invention comprises a power plant main flue, a wastewater evaporation tower 80, a wastewater back-spray conveying pipeline 200 and a chemical adding device 100.
The main flue of the power plant comprises a power plant boiler 10, a denitration device 20, an air preheater 30, a main flue dust remover 40, a wet desulphurization tower 50 and a chimney 60 which are sequentially connected through a main flue 70.
The waste water evaporation tower 80 is connected to the main flue 70 between the main flue dust remover 40 and the wet desulphurization tower 50 through a first bypass flue 702, the flue gas outlet of the waste water evaporation tower 80 is connected to the rear bypass flue dust remover 90 through a flue, and the bypass flue dust remover 90 is connected back to the main flue at the front end of the wet desulphurization tower 50 through a second bypass flue 704.
One end of the wastewater back-spraying conveying pipeline 200 is connected to the wet desulphurization tower 50, and the other end is connected with a nozzle arranged at the top of the wastewater evaporation tower 80, so that the desulphurization wastewater discharged from the wet desulphurization tower 50 is back-sprayed into the wastewater evaporation tower 80 to be evaporated to dryness.
The chemical adding device 100 is connected to the wastewater back-spray conveying pipeline 200 and is used for adding a medicament for preventing caking into the desulfurization wastewater in the wastewater back-spray conveying pipeline 200.
The main flue 70 is positioned between the joint of the first bypass flue 702 and the second bypass flue 704, and is provided with a main flue gate 701; a smoke inlet gate 703 is arranged at the position of the first bypass flue 702 close to the connection of the main flue; a smoke outlet gate 705 is arranged at the position, close to the main flue, of the second bypass flue 704; when the smoke inlet gate 703 and the smoke outlet gate 705 are opened and the main flue gate 701 is closed, the high-temperature flue gas in the main flue 70 enters the wastewater evaporation tower 80, is mixed and evaporated with the desulfurization wastewater sprayed into the wastewater evaporation tower 80 at the same time, then returns to the main flue 70 through the second bypass flue 704, and is discharged for subsequent desulfurization treatment; when the smoke inlet gate 703 and the smoke outlet gate 705 are closed and the main flue gate 701 is opened, the high-temperature flue gas is blocked from entering the wastewater evaporation tower 80, and all the flue gas is discharged through the main flue 70 and then is subjected to the subsequent desulfurization treatment.
The bottom of the waste water evaporation tower 80 and the bottom of the bypass flue dust collector 90 are connected to an ash discharge hopper 81, and ash containing salt is collected. Firstly, the main flue dust collector 40 can intercept most of the fly ash in the high-temperature flue gas, and the fly ash can be used as an industrial byproduct fly ash product after being discharged from the main flue dust collector 40. The high temperature flue gas trapped by the main flue dust collector 40 then enters the wastewater evaporation tower 80 and is trapped by the bypass flue dust collector 90 again, and the part of the fly ash contains more salt, so the fly ash is not suitable for being used as a product.
The wastewater back-spray conveying pipeline 200 comprises a desulfurization wastewater storage tank 201 and an adjusting tank 203 which are sequentially connected through a desulfurization wastewater conveying pipeline 202, wherein the desulfurization wastewater is back-sprayed into the wastewater evaporation tower 80 after the pH value of the desulfurization wastewater is adjusted by the adjusting tank 203 and is mixed with high-temperature flue gas, so that the desulfurization wastewater is evaporated to dryness.
The dosing device 100 comprises a group of dosing pipelines 102, and is connected to any one or more of the desulfurization wastewater storage pool 201, the regulating pool 203 and the desulfurization wastewater conveying pipeline 202 through the dosing pipelines 102, and the agent for preventing caking is added into the desulfurization wastewater.
When the dosing pipeline 102 of the dosing device 100 is connected to the desulfurization wastewater storage tank 201 and/or the adjusting tank 203, a corresponding stirring device or an aeration device is arranged in the desulfurization wastewater storage tank 201 and/or the adjusting tank 203 and is used for uniformly mixing the added medicament and the desulfurization wastewater.
The chemical feeding pipeline 102 of the chemical feeding device 100 is connected with the desulfurization wastewater conveying pipeline 202 through the mixer 205, and the added chemical and the desulfurization wastewater are uniformly mixed in the mixer 205 and then are sent into the wastewater evaporation tower 80 together to be mixed and evaporated with the high-temperature flue gas.
The dosing device 10 comprises a medicament barrel 101, a dosing pipeline 102, a metering pump 103, a ball valve 104 and an electric cabinet 105; one end of the dosing pipeline 102 is connected with the chemical barrel 101, and the other end of the dosing pipeline is connected to the desulfurization wastewater conveying line 20; the ball valve 104 is arranged at the end part of the dosing pipeline 102 connected with the medicament barrel 101, the metering pump 103 is positioned on the dosing pipeline 102 and is in signal connection with the electric cabinet 105, and the medicament in the medicament barrel 101 is sent into the wastewater back-spraying conveying pipeline 200 through the dosing pipeline 102 by the metering pump 103.
The dosing pipeline 102 is also provided with a Y-shaped filter 106 and a back pressure valve 107, and the Y-shaped filter 106 and the back pressure valve 107 are sequentially arranged between the ball valve 104 and the metering pump 103.
And a desulfurization wastewater outward-discharging pump 204 is arranged on the wastewater back-spraying conveying pipeline 200, and the desulfurization wastewater outward-discharging pump 204 is in signal connection with the electric cabinet 105.
The working principle of the anti-blocking system for evaporating the power plant wastewater by utilizing the high-temperature flue gas is as follows:
firstly, high-temperature flue gas generated in the power plant boiler 10 is sequentially treated by the denitration device 20, the air preheater 30, the main flue dust remover 40 and the wet desulfurization tower 50 through the power plant main flue 70 and then is discharged into the atmosphere through the chimney 60.
The desulfurization waste water generated by desulfurization in the wet desulfurization tower 50 is collected in a desulfurization waste water storage tank 201 through a pipeline, treated by a regulating tank 203, sent into a waste water evaporation tower 80 connected with the main flue 30 through a desulfurization waste water delivery pipe 202 by a desulfurization waste water outward discharge pump 204 to be mixed with high-temperature flue gas, and the desulfurization waste water is evaporated by the high-temperature flue gas. The high-temperature flue gas in the main flue 30 firstly intercepts most of the fly ash through the main flue dust collector 40, and then enters the wastewater evaporation tower 80 through the first bypass flue 702.
Before the desulfurization wastewater is fed into the wastewater evaporation tower 80 to be mixed with the high-temperature flue gas, a process modifier is added into the desulfurization wastewater through the dosing device 10. When the smoke inlet gate 703 and the smoke outlet gate 705 are opened and the main flue gate 701 is closed, the high-temperature flue gas in the main flue 70 enters the wastewater evaporation tower 80 to be mixed with the desulfurization wastewater sprayed into the wastewater evaporation tower 80 at the same time, the sulfur-containing wastewater is instantaneously evaporated by using the high-temperature flue gas, then the high-temperature flue gas enters the bypass flue dust remover 90 to remove the ash content containing the salt, finally the high-temperature flue gas returns to the main flue 70 through the second bypass flue 704, and the sulfur-containing wastewater is discharged to the subsequent desulfurization treatment. When the smoke inlet gate 703 and the smoke outlet gate 705 are closed and the main flue gate 701 is opened, the high-temperature flue gas is blocked from entering the wastewater evaporation tower 80, and all the flue gas is discharged through the main flue 70 and then is subjected to the subsequent desulfurization treatment. At this moment, the waste water evaporation tower 80 can be subjected to ash removal and maintenance operations, and accumulated ash collected in the waste water evaporation tower 80 and the bypass flue dust remover 90 is discharged from the ash discharge port 81 for centralized treatment.
In different application scenarios, the chemical adding point of the chemical adding device 100 to the desulfurization wastewater may be adjusted, for example, added to the desulfurization wastewater conveying pipe 202, directly added to the desulfurization wastewater storage tank 201, or added to both the desulfurization wastewater conveying pipe 202 and the desulfurization wastewater storage tank 201. If the addition point is on the desulfurization wastewater conveying pipeline 202, the agent and the desulfurization wastewater need to be uniformly mixed by a mixer 205, such as a static mixer, and then are sprayed into the wastewater evaporation tower 80, and the precipitated salt-containing ash can be collected by the subsequent bypass flue dust remover 90. The flue gas in the main flue 40 is prevented from directly entering the waste water evaporation tower 80, so that the fly ash in the flue gas cannot be utilized.
Taking 30 ten thousand kw units as an example, about 1200 tons of coal are consumed per day, about 240 tons of fly ash are generated, the market recycling price is about 150 yuan/ton, 36000 yuan can be put in per day, and 1314 ten thousand yuan can be put in per year. If the flue gas of the main flue is directly sprayed back to the waste water evaporation tower (80), a large amount of harmful components are mixed in the fly ash, the fly ash cannot be recycled, and benefits are generated, meanwhile, the landfill cost of about 240 tons of fly ash is additionally increased every day, the landfill cost is about 48 ten thousand yuan, and the cost of one year is about 17520 ten thousand yuan.
The desulfurization wastewater is sprayed back to a wastewater evaporation tower on the site of the thermal power plant, before no process regulator is added, when the desulfurization wastewater is sprayed back, less fly ash falls from a lower ash outlet of an evaporator, the tower is seriously agglomerated, and a flue gas channel of the evaporator is blocked by more than half every 1-2 days, so that the thermal power plant needs to be stopped for manual cleaning; during the cleaning process, the salt accumulated in the evaporator is very hard, and as rock is common, a pneumatic pick is needed to slowly clean the hard blocks, and the cleaning period is as long as 5-7 days.
The following are comparative effects of process modifiers with different ingredients added separately: FIG. 2 shows that a large number of hard lumps are present in the wastewater evaporator before the process control agent is added, which are difficult to clean. FIG. 3 shows that after fatty alcohol polyoxyethylene ether sulfate (AES) is added to the desulfurization wastewater, the wastewater is discharged smoothly from the wastewater evaporation tower, and ash content is in the form of gray fine particles. FIG. 4 shows that after the yellow blood salt is added into the desulfurization wastewater, the wastewater is smoothly discharged by the wastewater evaporation tower without manual cleaning, and the ash content is orange granules. FIG. 5 shows that after polyacrylic acid is added to desulfurization wastewater, the wastewater evaporation tower discharges easily without manual cleaning, and ash content is dark gray powder. FIG. 6 shows that after sodium gluconate is added to the desulfurization waste water, the waste water evaporation tower discharges smoothly without manual cleaning, and the ash content is dark yellow and fine particles. FIG. 7 shows that sodium citrate and polyacrylic acid are added into the desulfurization wastewater, the wastewater is discharged smoothly by the wastewater evaporation tower, manual cleaning is not needed, and ash content is gray particles. FIG. 8 shows that sodium gluconate and sodium dodecylbenzenesulfonate are added into desulfurization wastewater, so that the wastewater is discharged smoothly by the wastewater evaporation tower without manual cleaning, and ash content is gray fine powder.
The invention provides a method for treating industrial wastewater by using power generation flue gas waste heat, and a method and a way for realizing the technical scheme are numerous, the above description is only a preferred embodiment of the invention, and it should be noted that, for a person skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the invention, and the improvements and decorations should also be regarded as the protection scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. A method for treating industrial wastewater by using power generation flue gas waste heat is characterized in that a process regulator is added into the industrial wastewater, the industrial wastewater and the process regulator are uniformly mixed, and then the industrial wastewater added with the process regulator is sprayed into an evaporator or a flue of a power generation boiler system of a power plant.
2. The method for treating industrial wastewater by using the waste heat of the power generation flue gas as claimed in claim 1, wherein the process modifier is uniformly mixed with the industrial wastewater in the wastewater tank by a dosing device and then sprayed into an evaporator or a flue together.
3. The method for treating industrial wastewater by using the waste heat of the power generation flue gas as claimed in claim 1, wherein the process modifier is uniformly mixed with the industrial wastewater in a pipeline mixer by a dosing device and then sprayed into an evaporator or a flue together.
4. The method for treating industrial wastewater by using the waste heat of power generation flue gas as claimed in claim 1, wherein the industrial wastewater comprises any one or a mixture of more than two of desulfurization wastewater, circulating water concentrated water, desalted water concentrated water and landfill leachate.
5. The method for treating industrial wastewater by using the waste heat of power generation flue gas as claimed in claim 1, wherein the process regulator is one or a mixture of more of xanthate, surfactant, polymer and organic carboxylate.
6. The method for treating industrial wastewater by using the waste heat of the power generation flue gas as claimed in claim 5, wherein the surfactant is an anionic surfactant and/or a nonionic surfactant.
7. The method for treating industrial wastewater by using the waste heat of the power generation flue gas as claimed in claim 5, wherein the number average molecular weight of the polymer is less than or equal to 1200, and the molecular weight distribution index is less than or equal to 2.5.
8. A process regulator for treating industrial wastewater by using the waste heat of power generation flue gas is characterized in that the process regulator is one or a mixture of more of xanthate, surfactant, polymer and organic carboxylate.
9. The process regulator for treating industrial wastewater by using the waste heat of power generation flue gas as claimed in claim 8, wherein the surfactant is an anionic surfactant and/or a nonionic surfactant.
10. The process regulator for treating industrial wastewater by using the waste heat of power generation flue gas of claim 8, wherein the polymer has a number average molecular weight of 1200 or less and a molecular weight distribution index of 2.5 or less.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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