CN114933371A - Waste incineration fly ash water washing liquid pretreatment equipment and treatment method thereof - Google Patents
Waste incineration fly ash water washing liquid pretreatment equipment and treatment method thereof Download PDFInfo
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- CN114933371A CN114933371A CN202210555888.XA CN202210555888A CN114933371A CN 114933371 A CN114933371 A CN 114933371A CN 202210555888 A CN202210555888 A CN 202210555888A CN 114933371 A CN114933371 A CN 114933371A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 204
- 239000007788 liquid Substances 0.000 title claims abstract description 158
- 238000005406 washing Methods 0.000 title claims abstract description 132
- 239000010881 fly ash Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004056 waste incineration Methods 0.000 title claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 132
- 238000000926 separation method Methods 0.000 claims abstract description 47
- 238000002203 pretreatment Methods 0.000 claims abstract description 10
- 239000013043 chemical agent Substances 0.000 claims description 35
- 239000000706 filtrate Substances 0.000 claims description 28
- 238000012546 transfer Methods 0.000 claims description 26
- 229910001385 heavy metal Inorganic materials 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 238000001704 evaporation Methods 0.000 claims description 18
- 230000008020 evaporation Effects 0.000 claims description 18
- 239000007790 solid phase Substances 0.000 claims description 17
- 238000002425 crystallisation Methods 0.000 claims description 16
- 230000008025 crystallization Effects 0.000 claims description 16
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical group [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 13
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 13
- 229910001424 calcium ion Inorganic materials 0.000 claims description 13
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 238000006386 neutralization reaction Methods 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000006298 dechlorination reaction Methods 0.000 claims description 7
- 238000004062 sedimentation Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000000265 homogenisation Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000004448 titration Methods 0.000 claims description 4
- 238000003556 assay Methods 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical group [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 12
- 239000011575 calcium Substances 0.000 description 12
- 229910052791 calcium Inorganic materials 0.000 description 12
- 239000011777 magnesium Substances 0.000 description 12
- 229910052749 magnesium Inorganic materials 0.000 description 12
- 150000001804 chlorine Chemical class 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a waste incineration fly ash water washing liquid pretreatment device applied to the technical field of waste incineration fly ash treatment, and also relates to a fly ash water washing liquid pretreatment method, wherein each reaction water tank (2) of the waste incineration fly ash water washing liquid pretreatment device is respectively connected with a solid-liquid separation part (3), and the solid-liquid separation part (3) is connected with a cache water tank (4); the pretreatment equipment and the pretreatment method for the waste incineration fly ash washing liquid can effectively improve the treatment quality of the fly ash washing liquid, realize the controllability of the pretreatment process of the fly ash washing liquid, realize the controllability of the pretreatment result and simultaneously reduce the field operation strength.
Description
Technical Field
The invention belongs to the technical field of waste incineration fly ash treatment, and particularly relates to a device for pretreating waste incineration fly ash water washing liquid and a method for pretreating the fly ash water washing liquid.
Background
In the process of co-processing the fly ash generated by burning the household garbage, the fly ash needs to be pre-processed, the core is that soluble chlorine elements in the fly ash are removed through water washing, and the fly ash qualified in dechlorination is subjected to subsequent co-processing, but a large amount of water washing liquid generated in the process can be recycled through evaporation mass separation crystallization due to the soluble chlorine salt, so that the influence on the environment and the waste of resources caused by direct discharge are avoided. Because the fly ash washing liquid contains a large amount of soluble chlorine salt, calcium, magnesium, heavy metals and filter residues which are not completely separated, the calcium, the magnesium and the like can cause the washing liquid to be separated out in the evaporation process to form scale to influence the heat exchange efficiency of the evaporator, and the filter residues, the heavy metals and the like can influence the quality of crystallized salt, the fly ash washing liquid needs to be pretreated to meet the requirement of subsequent evaporation quality-grading crystallization. Fluctuations in the fly ash composition can affect the composition of the aqueous scrubbing solution, which can lead to uncertainty in the pretreatment of the fly ash aqueous scrubbing solution, and therefore, optimization of the pretreatment process is desirable.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the garbage incineration fly ash washing liquid pretreatment equipment is simple in structure, can perform process optimization on the fly ash washing liquid pretreatment process, effectively improves the treatment quality of the fly ash washing liquid, realizes the controllability of the pretreatment process and the pretreatment result of the fly ash washing liquid, and simultaneously reduces the field operation intensity.
To solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention relates to a pretreatment device for waste incineration fly ash washing liquid, which comprises a transfer water tank, wherein the transfer water tank is communicated with a plurality of reaction water tanks, each reaction water tank is respectively connected with a solid-liquid separation component, and the solid-liquid separation component is connected with a cache water tank; every the reaction pond in set up the reaction agitator respectively, the reaction agitator sets up bilayer structure's stirring paddle, the reaction pond bottom sets up the slope, every reaction pond connects chemical agent respectively and adds the part, chemical agent gets rid of and PH regulator, heavy metal remover for calcium ion remover, magnesium ion.
The calcium ion remover of the chemical agent adding component is sodium carbonate, the magnesium ion removing and PH regulator is sodium hydroxide, and the heavy metal remover is ferrous sulfate or sodium thiosulfate.
The buffer water tank is communicated with a neutralization tank, a structure capable of adding hydrochloric acid is arranged in the neutralization tank, and the neutralization tank is communicated with a stable reaction tank.
The stable reaction tank is communicated with a filter, the filter is communicated with an evaporation crystallization working section, and the solid-liquid separation part is communicated with a solid-phase washing working section.
The reaction tank lower extreme set up the washing liquid export, the low position of washing liquid export alignment slope, washing liquid export intercommunication solid-liquid separation part, the slope includes a plurality of not at the slope planes of coplanar.
The transfer water tank is communicated with the washing liquid inlet of each reaction water tank through a pipeline, and the chemical agent adding component is communicated with the liquid medicine inlet of each reaction water tank.
A transfer buffer tank is arranged between the solid-liquid separation component and the buffer pool; the reaction water pool comprises a reaction water pool A, a reaction water pool B and a reaction water pool C.
The pipeline between the stable reaction tank and the filter is communicated with a cache water tank; the pipeline between the transfer buffer tank and the buffer pool is communicated with the pipeline between the transfer pool and the reaction pool.
The invention also relates to a method for pretreating the fly ash washing liquid of the waste incineration, which has simple steps, can carry out process optimization on the pretreatment process of the fly ash washing liquid, effectively improves the treatment quality of the fly ash washing liquid, realizes the controllability of the pretreatment process and the pretreatment result of the fly ash washing liquid, and simultaneously reduces the operation intensity on site.
The pretreatment method of the waste incineration fly ash water washing liquid comprises the following pretreatment steps:
s1, fly ash washing liquid generated in a fly ash washing dechlorination process enters a transfer water tank for caching, fine solids which are not completely separated in solid-liquid separation in a washing section are settled to a pipeline at the bottom of the transfer water tank 1 again in a natural settling mode, and then enter a reaction water tank through a return liquid inlet;
s2, the water washing liquid which is homogenized and naturally settled enters a reaction water tank from a transfer water tank, and a reaction stirrer of the reaction water tank carries out double-layer stirring; the chemical agent adding part adds chemical agents to each reaction water tank respectively: calcium ion remover, magnesium ion remover, pH regulator and heavy metal remover;
s3, feeding water washing liquid after reaction in the reaction water tank into a solid-liquid separation component for solid-liquid separation, feeding filtrate into a buffer water tank for natural sedimentation and homogenization, and feeding a solid phase into a solid phase water washing section;
and S4, detecting the PH value of the filtrate on line by using a buffer pool and a stable reaction pool, and performing online linkage control on the addition amount of the hydrochloric acid added into the filtrate according to detection equipment of the PH value.
And S5, filtering the filtrate passing through the stable reaction tank by using a filter, and then entering an evaporation crystallization section.
After each water treatment worker goes on duty, taking the water sample in the reaction water tank A which is subjected to the previous water treatment and the water sample in the reaction water tank B which is subjected to the water treatment and needs to be subjected to the current work to carry out titration assay; testing and judging whether the water quality processed in the previous shift is qualified or not and the components of the water sample to be processed in the current shift; adding chemical agents into the water washing liquid to be treated in the class according to the composition of water samples; if the water quality treated in the previous work is unqualified, adding chemical agents according to the components for secondary treatment; if the solid-liquid separation is qualified, carrying out solid-liquid separation; the filtrate produced in the washing section in the production process enters a reaction water tank C.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
the invention relates to a pretreatment device and a pretreatment method for waste incineration fly ash water washing liquid. Thus, the quality of the fly ash washing liquid is effectively improved. The whole device and the method have low cost and reliable use, can continuously operate, meet the treatment requirement of the fly ash washing liquid on site, effectively separate and recover soluble calcium, magnesium, heavy metal, filter residue which is not completely separated, calcium, magnesium and the like, reduce pollution and protect the environment. When the fly ash water washing liquid is pretreated, the fly ash water washing liquid generated in the fly ash washing dechlorination process enters the transit water tank 1 for caching, and fine solids which are not completely separated in the solid-liquid separation of the washing section are also settled to the pipeline at the bottom of the transit water tank 1 again in a natural settling mode; the water washing liquid which is homogenized and naturally settled enters a reaction water tank from a transfer water tank, and a reaction stirrer of the reaction water tank carries out double-layer stirring; the chemical agent adding part adds chemical agents to each reaction water tank respectively: calcium ion remover, magnesium ion remover, pH regulator and heavy metal remover; the water washing liquid after the reaction in the reaction water tank enters a solid-liquid separation part for solid-liquid separation, the filtrate enters a buffer water tank for natural sedimentation and homogenization, and the solid phase enters a solid phase water washing section; and the buffer pool and the stable reaction pool detect the pH value of the filtrate on line, and the addition amount of the hydrochloric acid added into the filtrate is controlled in an on-line linkage manner according to the detection equipment of the pH value. And filtering the filtrate in the stable reaction tank by a filter and then entering an evaporation crystallization section. The pretreatment equipment and the pretreatment method for the waste incineration fly ash washing liquid can optimize the process of the pretreatment process of the fly ash washing liquid, effectively improve the treatment quality of the fly ash washing liquid, realize the controllability of the pretreatment process of the fly ash washing liquid and the pretreatment result, and simultaneously reduce the field operation strength.
Drawings
The contents of the specification, as well as the references used in the drawings, will now be briefly described as follows:
FIG. 1 is a schematic structural view of a waste incineration fly ash water washing liquid pretreatment apparatus according to the present invention;
FIG. 2 is a schematic sectional view of the reaction stirring tank of the waste incineration fly ash washing liquid pretreatment apparatus according to the present invention;
FIG. 3 is a schematic structural view of the slope of the reaction stirring tank of the waste incineration fly ash washing liquid pretreatment apparatus according to the present invention;
in the drawings, the symbols are respectively: 1. a transit water pool; 2. a reaction water tank; 3. a solid-liquid separation member; 4. caching a water pool; 5. a reaction stirrer; 6. a slope; 7. a chemical agent addition member; 8. a neutralization tank; 9. stabilizing the reaction tank; 10. a filter; 11. an evaporation crystallization section; 12. a solid-phase water washing section; 13. a transfer buffer tank; 14. a reaction water tank A; 15. a reaction water tank B; 16. a reaction water tank C; 17. stirring the paddle; 18. a washing liquid outlet; 19. a slope plane; 20. a liquid medicine inlet; 21. a washing liquid inlet; 22. and a return liquid inlet.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:
as shown in attached figures 1-3, the invention relates to a pretreatment device for waste incineration fly ash washing liquid, which comprises a transfer water tank 1, wherein the transfer water tank 1 is communicated with a plurality of reaction water tanks 2, each reaction water tank 2 is respectively connected with a solid-liquid separation component 3, and the solid-liquid separation component 3 is connected with a cache water tank 4; every reaction water tank 2 in set up reaction agitator 5 respectively, reaction agitator 5 sets up bilayer structure's stirring paddle 17, reaction water tank 2 bottom sets up slope 6, every reaction water tank 2 is connected chemical agent respectively and is added part 7, chemical agent is calcium ion remover, magnesium ion gets rid of and PH regulator, heavy metal remover. The structure provides an improvement scheme aiming at the defects in the prior art. Because the fly ash washing liquid in the prior art contains a large amount of soluble chlorine salt, calcium, magnesium, heavy metals and filter residues which are not completely separated, the calcium, the magnesium and the like can cause the washing liquid to be separated out in the evaporation process to form scale to influence the heat exchange efficiency of an evaporator, and the filter residues, the heavy metals and the like can influence the quality of crystallized salt, the fly ash washing liquid needs to be pretreated to meet the requirement of subsequent evaporation and quality separation crystallization. Therefore, the device of the invention carries out pretreatment before the fly ash washing liquid enters the evaporation crystallization working section 11, and in a reaction water tank, soluble calcium, magnesium, heavy metals, filter residue which is not completely separated, calcium, magnesium and the like in the fly ash washing liquid are reacted and separated out, and then solid-liquid separation is carried out, and the pretreated filtrate is supplied to the evaporation crystallization working section 11. Therefore, the quality of the fly ash water washing liquid is effectively improved. The whole equipment and the method have low cost and reliable use, can continuously operate, effectively separate out and recover soluble calcium, magnesium, heavy metal, filter residue which is not thoroughly separated, calcium, magnesium and the like, reduce pollution and protect the environment. When the fly ash water washing liquid is pretreated, the fly ash water washing liquid generated in the fly ash washing dechlorination process enters the transit water tank 1 for caching, and fine solids which are not completely separated in the solid-liquid separation of the washing section are also settled to the pipeline at the bottom of the transit water tank 1 again in a natural settling mode; the water washing liquid which is homogenized and naturally settled enters a reaction water tank 2 from a transit water tank 1, and a reaction stirrer 5 of the reaction water tank 2 performs double-layer stirring; the chemical agent adding part 7 adds chemical agents to each reaction tank 2: calcium ion remover, magnesium ion remover, pH regulator and heavy metal remover; the water washing liquid after the reaction in the reaction water tank 2 enters a solid-liquid separation part 3 for solid-liquid separation, the filtrate enters a buffer water tank 4 for natural sedimentation and homogenization, and the solid phase enters a solid phase water washing section 12; the buffer pool 4 and the stable reaction pool 9 detect the PH value of the filtrate on line, and the addition amount of the hydrochloric acid added into the filtrate is controlled in an on-line linkage manner according to the detection equipment of the PH value. The filtrate passing through the stabilization reaction tank 9 is filtered by a filter 10 and then enters an evaporation crystallization section 11. The pretreatment equipment and the pretreatment method for the waste incineration fly ash washing liquid can optimize the process of the pretreatment process of the fly ash washing liquid, effectively improve the treatment quality of the fly ash washing liquid, realize the controllability of the pretreatment process of the fly ash washing liquid and the pretreatment result, and simultaneously reduce the field operation strength.
The chemical agent of the chemical agent adding part 7 is composed of a calcium ion remover, a magnesium ion remover, a pH regulator and a heavy metal remover, wherein the calcium ion remover is sodium carbonate, the magnesium ion remover and the pH regulator are sodium hydroxide, and the heavy metal remover is ferrous sulfate or sodium thiosulfate. According to the structure, the chemical agent is added into the reaction water tank through the chemical agent adding part 7, so that efficient and reliable reaction of the water washing liquid is realized. And the heavy metal remover is selected and used, so that the effect is good.
The buffer pool 4 is communicated with a neutralization tank 8, a structure capable of adding hydrochloric acid is arranged in the neutralization tank 8, and the neutralization tank 8 is communicated with a stable reaction tank 9. The stable reaction tank 9 is communicated with a filter 10, the filter 10 is communicated with an evaporation crystallization section 11, and the solid-liquid separation part 3 is communicated with a solid-phase water washing section 12. 2 lower extreme in reaction tank set up wash solution export 18, wash solution export 18 aims at the low position of slope 6, wash solution export 18 intercommunication solid-liquid separation part 3, slope 6 includes a plurality of not in the slope plane 19 of coplanar. According to the structure, after water washing liquid enters the reaction water tank, the water washing liquid is stirred in the reaction water tank through the stirring blades of the reaction stirrer and then reacts, and after the reaction, the water washing liquid is subjected to mass loading and natural sedimentation on the slope, and then enters the solid-liquid separation component.
The transfer water tank 1 is communicated with a washing liquid inlet 21 of each reaction water tank 2 through a pipeline, and the chemical agent adding part 7 is communicated with a chemical liquid inlet 20 of each reaction water tank 2. A transfer buffer tank 13 is arranged between the solid-liquid separation component 3 and the buffer pool 4; the reaction water pool 2 comprises a reaction water pool A14, a reaction water pool B15 and a reaction water pool C16. Above-mentioned structure, a plurality of reaction tanks are applied to different processing shifts respectively, satisfy the requirement. The pipeline between the stable reaction tank 9 and the filter 10 is communicated with the buffer water tank 4; the pipeline between the transit buffer tank 13 and the buffer pool 4 is communicated with the pipeline between the transit pool 1 and the reaction pool 2.
The stable reaction tank is communicated with a filter, the filter is communicated with an evaporation crystallization working section, and the solid-liquid separation part is communicated with a solid-phase washing working section.
The invention also relates to a method for pretreating the waste incineration fly ash water washing liquid, which has simple steps, can optimize the process of the pretreatment process of the fly ash water washing liquid, effectively improves the treatment quality of the fly ash water washing liquid, realizes the controllability of the pretreatment process of the fly ash water washing liquid and the controllability of the pretreatment result, and simultaneously reduces the field operation strength.
The pretreatment method of the waste incineration fly ash washing liquid comprises the following steps:
s1, fly ash washing liquid generated in the fly ash washing dechlorination process enters a transfer water tank 1 for caching, fine solids which are not completely separated in solid-liquid separation in a washing section are again settled to a pipeline at the bottom of the transfer water tank 1 in a natural settling mode, and then enter a reaction water tank through a return liquid inlet; s2, the water washing liquid which is homogenized and naturally settled enters a reaction water tank 2 from a transit water tank 1, and a reaction stirrer 5 of the reaction water tank 2 performs double-layer stirring; the chemical agent adding part 7 adds chemical agents to each reaction tank 2: calcium ion remover, magnesium ion remover, pH regulator and heavy metal remover; s3, feeding the water washing liquid after the reaction in the reaction water tank 2 into a solid-liquid separation part 3 for solid-liquid separation, feeding the filtrate into a buffer water tank 4 for natural sedimentation and homogenization, and feeding the solid phase into a solid phase water washing section 12; and S4, detecting the pH value of the filtrate on line by using the buffer pool 4 and the stable reaction pool 9, and performing online linkage control on the addition amount of the hydrochloric acid added into the filtrate according to a detection device of the pH value. And S5, filtering the filtrate passing through the stable reaction tank 9 by using a filter 10, and then entering an evaporation crystallization section 11.
In the method for pretreating the waste incineration fly ash washing liquid, after each water treatment worker goes on duty, a water sample in a reaction water tank A14 in which the previous water treatment is finished and a water sample in a reaction water tank B15 in which the water treatment is required are taken for titration assay; testing and judging whether the water quality processed in the previous shift is qualified or not and the components of the water sample to be processed in the current shift; adding chemical agents into the water washing liquid to be treated in the class according to the composition of water samples; if the water quality treated in the previous work is unqualified, adding chemical agents according to the components for secondary treatment; if the solid-liquid separation is qualified, carrying out solid-liquid separation; the filtrate produced in the water washing section in the production process enters a reaction water pool C16. And the step realizes clear division of the responsibility of each shift. Through the operation process description, under the normal condition, each water treatment station only needs one sampling and two titrations, so that the chemical agents can be accurately added in the water treatment process, and meanwhile, the water quality of the water treatment can be effectively controlled to meet the standard requirement.
The invention relates to a pretreatment device and a pretreatment method for waste incineration fly ash water washing liquid. Therefore, the quality of the fly ash water washing liquid is effectively improved. The whole device and the method have low cost and reliable use, can continuously operate, meet the treatment requirement of the fly ash washing liquid on site, effectively separate and recover soluble calcium, magnesium, heavy metal, filter residue which is not completely separated, calcium, magnesium and the like, reduce pollution and protect the environment. When the fly ash water washing liquid is pretreated, the fly ash water washing liquid generated in the fly ash washing dechlorination process enters the transit water tank 1 for caching, and fine solids which are not completely separated in the solid-liquid separation of the washing section are also settled to the pipeline at the bottom of the transit water tank 1 again in a natural settling mode; the water washing liquid which is homogenized and naturally settled enters a reaction water tank from a transfer water tank, and a reaction stirrer of the reaction water tank carries out double-layer stirring; the chemical agent adding part adds chemical agents to each reaction water tank respectively: calcium ion remover, magnesium ion remover, pH regulator and heavy metal remover; the water washing liquid after the reaction in the reaction water tank enters a solid-liquid separation part for solid-liquid separation, the filtrate enters a buffer water tank for natural sedimentation and homogenization, and the solid phase enters a solid phase washing section; and the buffer pool and the stable reaction pool detect the pH value of the filtrate on line, and the addition amount of the hydrochloric acid added into the filtrate is controlled in an on-line linkage manner according to the detection equipment of the pH value. And filtering the filtrate in the stable reaction tank by a filter and then entering an evaporation crystallization section. The pretreatment equipment and the pretreatment method for the waste incineration fly ash washing liquid can optimize the process of the pretreatment process of the fly ash washing liquid, effectively improve the treatment quality of the fly ash washing liquid, realize the controllability of the pretreatment process and the pretreatment result of the fly ash washing liquid, and simultaneously reduce the field operation intensity.
The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.
Claims (10)
1. A waste incineration fly ash washing liquid pretreatment device is characterized in that: the system comprises a transfer water tank (1), wherein the transfer water tank (1) is communicated with a plurality of reaction water tanks (2), each reaction water tank (2) is respectively connected with a solid-liquid separation component (3), and the solid-liquid separation component (3) is connected with a cache water tank (4); every reaction water tank (2) in set up reaction agitator (5) respectively, reaction agitator (5) set up bilayer structure's stirring paddle (17), reaction water tank (2) bottom sets up slope (6), chemical agent interpolation part (7) is connected respectively in every reaction water tank (2), chemical agent is calcium ion remover, magnesium ion gets rid of and PH regulator, heavy metal remover.
2. The waste incineration fly ash washing liquid pretreatment apparatus according to claim 1, characterized in that: the calcium ion remover of the chemical agent adding part (7) is sodium carbonate, the magnesium ion remover and the PH regulator are sodium hydroxide, and the heavy metal remover is ferrous sulfate or sodium thiosulfate.
3. The waste incineration fly ash washing liquid pretreatment apparatus according to claim 1 or 2, characterized in that: the buffer pool (4) is communicated with the neutralization tank (8), a structure capable of adding hydrochloric acid is arranged in the neutralization tank (8), and the neutralization tank (8) is communicated with the stable reaction tank (9).
4. The waste incineration fly ash washing liquid pretreatment apparatus according to claim 3, characterized in that: the stable reaction tank (9) is communicated with a filter (10), the filter (10) is communicated with an evaporation crystallization working section (11), and the solid-liquid separation part (3) is communicated with a solid-phase water washing working section (12).
5. The waste incineration fly ash water washing liquid pretreatment apparatus according to claim 1 or 2, characterized in that: reaction pond (2) lower extreme set up wash solution export (18), the low grade position of slope (6) is aimed at in wash solution export (18), wash solution export (18) intercommunication solid-liquid separation part (3), slope (6) include a plurality of not slope planes (19) at the coplanar.
6. The waste incineration fly ash water washing liquid pretreatment apparatus according to claim 1 or 2, characterized in that: the transfer water tank (1) is communicated with a washing liquid inlet (21) of each reaction water tank (2) through a pipeline, and the chemical agent adding component (7) is communicated with a liquid medicine inlet (20) of each reaction water tank (2).
7. The waste incineration fly ash washing liquid pretreatment apparatus according to claim 4, characterized in that: a transfer buffer tank (13) is arranged between the solid-liquid separation component (3) and the buffer pool (4); the reaction water pool (2) comprises a reaction water pool A (14), a reaction water pool B (15) and a reaction water pool C (16).
8. The waste incineration fly ash washing liquid pretreatment apparatus according to claim 7, characterized in that: the pipeline between the stable reaction tank (9) and the filter (10) is communicated with the buffer water tank (4); the pipeline between the transfer buffer tank (13) and the buffer pool (4) is communicated with the pipeline between the transfer pool (1) and the reaction pool (2).
9. A method for pretreating waste incineration fly ash water washing liquid is characterized by comprising the following steps: the pretreatment method of the waste incineration fly ash water washing liquid comprises the following pretreatment steps:
s1, fly ash washing liquid generated in a fly ash washing dechlorination process enters a transfer water tank (1) for caching, fine solids which are not completely separated in solid-liquid separation in a washing section are again settled to a pipeline at the bottom of the transfer water tank (1) in a natural settling mode, and then enter a reaction water tank (2) through a return liquid inlet (22);
s2, the washing liquid which is homogenized and naturally settled enters the reaction water tank (2) from the transit water tank (1), and a reaction stirrer (5) of the reaction water tank (2) performs double-layer stirring; the chemical agent adding part (7) adds chemical agents to each reaction water tank (2) respectively: calcium ion remover, magnesium ion remover, pH regulator and heavy metal remover;
s3, feeding the water washing liquid after the reaction in the reaction water tank (2) into a solid-liquid separation part (3) for solid-liquid separation, feeding the filtrate into a buffer water tank (4) for natural sedimentation and homogenization, and feeding the solid phase into a solid phase washing section (12);
and S4, detecting the PH value of the filtrate on line by using the buffer pool (4) and the stable reaction pool (9), and performing online linkage control on the addition amount of the hydrochloric acid added into the filtrate according to detection equipment of the PH value.
And S5, filtering the filtrate passing through the stable reaction tank (9) by a filter (10) and then entering an evaporation crystallization section (11).
10. The method for pretreating a waste incineration fly ash water washing liquid according to claim 1 or 2, characterized by: after each water treatment worker goes on duty, taking the water sample in the reaction water tank A (14) which is finished with the previous water treatment and the water sample in the reaction water tank B (15) which needs to be subjected to the water treatment for the current time to carry out titration assay; testing and judging whether the water quality treated in the previous shift is qualified or not and the components of the water samples required to be treated in the current shift; adding chemical agents into the water washing liquid to be treated in the class according to the composition of water samples; if the water quality treated in the previous work is unqualified, adding chemical agents according to the components for secondary treatment; if the solid-liquid separation is qualified, carrying out solid-liquid separation; the filtrate produced in the water washing section in the production process enters a reaction water pool C (16).
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| CN202210555888.XA CN114933371A (en) | 2022-05-20 | 2022-05-20 | Waste incineration fly ash water washing liquid pretreatment equipment and treatment method thereof |
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| CN202210555888.XA CN114933371A (en) | 2022-05-20 | 2022-05-20 | Waste incineration fly ash water washing liquid pretreatment equipment and treatment method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210394187U (en) * | 2019-07-09 | 2020-04-24 | 北京金隅琉水环保科技有限公司 | Fly ash washing cement kiln is dealt with in coordination and resource comprehensive utilization system |
| CN112374521A (en) * | 2020-11-13 | 2021-02-19 | 河北金坦化工装备有限公司 | Process for extracting calcium chloride from waste incineration fly ash |
| CN112479233A (en) * | 2020-12-19 | 2021-03-12 | 嘉兴昌宏环保科技有限公司 | Deep impurity removal and purification system and method for waste incineration fly ash washing liquid |
| CN215143291U (en) * | 2021-05-06 | 2021-12-14 | 深圳星河环境股份有限公司 | Incineration fly ash pretreatment system |
-
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- 2022-05-20 CN CN202210555888.XA patent/CN114933371A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210394187U (en) * | 2019-07-09 | 2020-04-24 | 北京金隅琉水环保科技有限公司 | Fly ash washing cement kiln is dealt with in coordination and resource comprehensive utilization system |
| CN112374521A (en) * | 2020-11-13 | 2021-02-19 | 河北金坦化工装备有限公司 | Process for extracting calcium chloride from waste incineration fly ash |
| CN112479233A (en) * | 2020-12-19 | 2021-03-12 | 嘉兴昌宏环保科技有限公司 | Deep impurity removal and purification system and method for waste incineration fly ash washing liquid |
| CN215143291U (en) * | 2021-05-06 | 2021-12-14 | 深圳星河环境股份有限公司 | Incineration fly ash pretreatment system |
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