CN213671059U - Fly ash wet processing system for cooperative disposal of cement kiln - Google Patents
Fly ash wet processing system for cooperative disposal of cement kiln Download PDFInfo
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- CN213671059U CN213671059U CN202021784745.9U CN202021784745U CN213671059U CN 213671059 U CN213671059 U CN 213671059U CN 202021784745 U CN202021784745 U CN 202021784745U CN 213671059 U CN213671059 U CN 213671059U
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Abstract
The utility model relates to the field of solid waste disposal, in particular to a fly ash wet processing system for cement kiln cooperative disposal, which comprises a fly ash washing system and a wastewater treatment system; the fly ash washing system washes and dechlorinates fly ash, the dechlorinated fly ash is dried and then enters a cement kiln for treatment, and wastewater generated by washing enters a wastewater treatment system; after the wastewater treatment system treats the wastewater, the wastewater enters evaporation crystallization equipment for crystallization; sludge generated in the wastewater treatment process enters a cement kiln for treatment; the method has the technical effects that the chlorine content in the fly ash is reduced by three-stage washing, the damage of cement kiln equipment caused by excessive chlorine is effectively avoided, and the scale of co-processing the fly ash by the cement kiln is improved; condensed water generated by evaporating purified wastewater is recycled to the fly ash washing system; the utility model discloses can not arrange waste water outward, do not exert an influence to surface water environment.
Description
Technical Field
The utility model belongs to the technical field of solid waste handles and specifically relates to a flying dust wet processing system that is used for cement kiln to deal with in coordination.
Background
With the continuous development of the urbanization level and the enhancement of the industrial economy, the yield of solid wastes such as sludge of municipal sewage treatment plants, sewage treatment sludge of industrial enterprises, polluted soil and the like is increased day by day; meanwhile, as the living standard of people is improved, the refuse city becomes a big factor which troubles the development of cities. At present, general solid wastes such as sludge, polluted soil and the like are mainly entrusted to an environmental sanitation department for landfill disposal, so that resource waste is caused; domestic garbage is subjected to reduction treatment in an incineration mode, and a large amount of incineration fly ash is generated and cannot be disposed.
According to the analysis of main elements, the components of the sludge, the polluted soil, the incineration fly ash and the like comprise Si, Ca, Al, Fe and the like, are similar to the components of cement raw materials, and can replace part of the cement raw materials; the sludge and other organic solid wastes of the municipal sewage plant contain a certain amount of heat value, and can replace part of cement production fuel. According to the relevant recommended technology in the catalog of advanced pollution control technologies in 2017 (in the field of solid waste treatment and disposal), the fly ash generated by burning the household garbage is subjected to countercurrent washing and solid-liquid separation, and the obtained dechlorinated fly ash can be used as a cement raw material for synergistic disposal, so that the fly ash generated by burning is harmless, reduced and recycled; the national hazardous waste record clearly indicates that the household garbage incineration fly ash meets the pollution control standard for cement kiln co-processing solid waste (GB 30485-2013), can enter a cement kiln for co-processing, the processing link belongs to the exemption range, the management is not carried out according to the hazardous waste, and the superiority of the cement kiln co-processing solid waste and the household garbage incineration fly ash is fully reflected.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a tertiary washing reduces chloride ion content, and waste water reuse is not arranged outward, does not influence surface water environment, and flying dust wet process cement kiln coprocessing system that byproduct economic benefits is high.
For the purpose of the utility model, the following technical scheme is adopted for implementation:
a fly ash wet processing system for cement kiln co-processing comprises a fly ash washing system and a waste water processing system; the fly ash washing system washes and dechlorinates fly ash, the dechlorinated fly ash is dried and then enters a cement kiln for treatment, and wastewater generated by washing enters a wastewater treatment system; after the wastewater treatment system treats the wastewater, the wastewater enters evaporation crystallization equipment for crystallization; sludge generated in the wastewater treatment process enters a cement kiln for treatment; the fly ash washing system comprises an ash bin, a pulping pool, a first-level washing tank, a second-level washing tank, a third-level washing tank and a centrifuge; conveying fly ash into a pulping pool from an ash bin through pneumatic conveying, stirring the fly ash into slurry in the pulping pool, enabling the slurry to sequentially pass through a first-stage water washing tank, a second-stage water washing tank and a third-stage water washing tank, stirring the slurry by the first-stage water washing tank, the second-stage water washing tank and the third-stage water washing tank, dechlorinating the slurry, fully precipitating the slurry after stirring, refluxing filtrate in the third-stage water washing tank into the second-stage water washing tank, refluxing filtrate in the second-stage water washing tank into the first-stage water washing tank, and allowing the filtrate in the first-stage water washing tank to enter a wastewater treatment system; centrifuges are connected to the rear parts of the first-stage water washing tank, the second-stage water washing tank and the third-stage water washing tank, the centrifuges convey precipitates into the next water washing tank, and the precipitates are dechlorinated and dried and finally enter a cement kiln; the wastewater treatment system comprises a storage tank, a decalcification reaction tank, a heavy metal removal tank, a sedimentation tank, a neutralization tank, an adsorption tank, a sand filter and MVR evaporative crystallization equipment which are connected in sequence; the wastewater flowing out of the primary washing tank enters a storage pool, the wastewater is decalcified and fully precipitated in a decalcification reaction pool, the wastewater on the upper layer enters a heavy metal removal pool, the metal removal pool is connected with a metal precipitator, a coagulant and a coagulant aid adding device, the heavy metal is precipitated under the action of the metal precipitator, the coagulant and the coagulant aid, and the wastewater on the upper layer enters a neutralization pool; in a neutralization pond, acid and alkali in the wastewater are added for neutralization reaction, so that a normal PH environment required by subsequent reaction is ensured; and (3) the neutralized wastewater enters an adsorption tank, particles in the wastewater are adsorbed under the action of activated carbon, then the wastewater enters a sand filter, suspended particles are filtered out, the wastewater enters MVR evaporation crystallization equipment for crystallization, and the generated condensed water flows back to a three-stage washing tank.
Preferably, the decalcification reaction tank is connected with one or more of sodium hydroxide, carbonate, silicate and phosphate adding devices; a calcium ion detection sensor is arranged in the decalcification reaction tank.
Preferably, the metal precipitating agent comprises sodium carbonate, sodium sulfide and a chelating agent; the coagulant is polyaluminium chloride; the coagulant aid is polyacrylamide.
Preferably, the lower layer sludge after the decalcification treatment is separated into decalcification filtrate and waste residue through centrifugal treatment, the decalcification filtrate flows back into a storage pool, and the waste residue enters a cement kiln for treatment.
Preferably, the acid added into the neutralization tank is hydrochloric acid, and the hydrochloric acid is introduced into the lower part of the neutralization tank through a pipeline to ensure that the adding position of the hydrochloric acid is below the liquid level of the solution, so that the generation of hydrochloric acid mist is prevented.
Preferably, the waste gas generated by the hydrochloric acid storage tank is introduced into the acid absorption tower, absorbed by the sodium hydroxide solution and then discharged by using a high-exhaust-gas cylinder.
Preferably, the waste activated carbon which loses activity in the adsorption tank enters a cement kiln for treatment.
Preferably, the sand filter is periodically back-flushed, and the back-flushing water flows back to the storage tank.
Preferably, the ratio of water to ash in the first-stage water washing tank, the second-stage water washing tank and the third-stage water washing tank is kept to be 2: 1-4: 1.
preferably, tap water and a stabilizer are added into the three-stage washing tank.
In summary, the technical effect of the utility model is that the condensed water generated by evaporation of the purified waste water is reused in the fly ash washing system; the content of chlorine element in the fly ash is reduced by the three-stage washing, the damage of cement kiln equipment caused by excessive chlorine element is effectively avoided, and the scale of the fly ash co-processed by the cement kiln is improved; sludge and waste activated carbon generated by the washing wastewater treatment are automatically treated by utilizing the existing cement kiln; the produced crystalline salt has high purity and can be sold as a byproduct after being identified by the byproduct.
Drawings
Fig. 1 is a flow chart of the present invention.
Detailed Description
As shown in FIG. 1, a fly ash wet treatment system for cement kiln co-processing comprises a fly ash washing system 1 and a waste water treatment system 2. The fly ash washing system 1 washes and dechlorinates fly ash, the dechlorinated fly ash is dried and then enters a cement kiln for treatment, and wastewater generated by washing enters a wastewater treatment system 2. The wastewater treatment system 2 is used for treating wastewater and then crystallizing the wastewater in evaporation crystallization equipment. Sludge generated in the wastewater treatment process enters a cement kiln for treatment.
The fly ash washing system 1 comprises an ash bin 11, a pulping pond 12, a first-level washing tank 13, a second-level washing tank 14, a third-level washing tank 15 and a centrifuge 16. The fly ash enters the pulping tank 12 from the ash bin 11 through pneumatic transmission, the fly ash is stirred into slurry in the pulping tank 12, the slurry sequentially passes through the first-stage water washing tank 13, the second-stage water washing tank 14 and the third-stage water washing tank 15, the first-stage water washing tank 13, the second-stage water washing tank 14 and the third-stage water washing tank 15 are used for dechlorinating the slurry while stirring, and the water-ash ratio in the first-stage water washing tank 13, the second-stage water washing tank 14 and the third-stage water washing tank 15 is kept to be 3: 1. tap water and a stabilizer are added to the tertiary water washing tank 15. After stirring, the slurry is fully precipitated, the filtrate in the third water washing tank 15 flows back to the second water washing tank 14, the filtrate in the second water washing tank 14 flows back to the first water washing tank 13, and the filtrate in the first water washing tank 13 enters the wastewater treatment system 2. The rear parts of the first-stage water washing tank 13, the second-stage water washing tank 14 and the third-stage water washing tank 15 are respectively connected with a centrifugal machine 16, the centrifugal machine 16 sends precipitates into the next water washing tank, and the precipitates finally enter the cement kiln after dechlorination and drying.
The wastewater treatment system 2 comprises a storage tank 21, a decalcification reaction tank 22, a heavy metal removal tank 23, a sedimentation tank 24, a neutralization tank 25, an adsorption tank 26, a sand filter 27 and MVR evaporative crystallization equipment 28 which are connected in sequence. The wastewater flowing out of the primary washing tank 13 enters a storage tank 21 and then enters a decalcification reaction tank 22, one or more of sodium hydroxide, carbonate, silicate and phosphate is/are added into the decalcification reaction tank 22 to precipitate calcium ions in the wastewater, a calcium ion detection sensor is arranged in the decalcification reaction tank 22, when the concentration of the calcium ions reaches the standard, stirring is stopped, after sufficient precipitation, sludge at the lower layer is separated into decalcification filtrate and waste residues through centrifugal treatment, the decalcification filtrate flows back into the storage tank 21, and the waste residues enter a cement kiln for treatment. The wastewater on the upper layer enters a heavy metal removal tank 23, heavy metals are precipitated under the action of sodium carbonate, sodium sulfide and a chelating agent, and the polyaluminium chloride and polyacrylamide are used as flocculating agents, so that the flocculating and precipitating speed is high. Has wide pH value range and can effectively remove heavy metal ions. The upper layer wastewater enters a neutralization pond 25. In the neutralization tank 25, hydrochloric acid is added to perform neutralization reaction with alkali in the wastewater, so that a normal pH environment required by subsequent reaction is ensured. Hydrochloric acid is introduced into the lower part of the neutralization tank 25 through a pipeline, so that the adding position of the hydrochloric acid is ensured to be below the liquid level of the solution, and the generation of hydrochloric acid mist is prevented. And introducing waste gas generated by the hydrochloric acid storage tank into an acid absorption tower, absorbing the waste gas by using a sodium hydroxide solution, and then discharging the waste gas by using a 15m high exhaust funnel. The neutralized wastewater enters an adsorption tank 26, particles in the wastewater are adsorbed and treated under the action of activated carbon, and the waste activated carbon which loses activity in the adsorption tank 26 enters a cement kiln for treatment. The wastewater then enters a sand filter 27, suspended particles are filtered out, the sand filter 27 is periodically back-flushed, and back-flushing water flows back to the storage tank 21. The wastewater enters an MVR evaporation crystallization device 28 for crystallization, and the generated condensed water flows back to the tertiary washing tank 15.
The utility model discloses there is following benefit: condensed water generated by evaporating purified wastewater is reused in the fly ash washing system 1; the content of chlorine element in the fly ash is reduced by the three-stage washing, the damage of cement kiln equipment caused by excessive chlorine element is effectively avoided, and the scale of the fly ash co-processed by the cement kiln is improved; sludge and waste activated carbon generated by the washing wastewater treatment are automatically treated by utilizing the existing cement kiln; the produced crystalline salt has high purity and can be sold as a byproduct after being identified by the byproduct.
Claims (10)
1. A fly ash wet treatment system for cement kiln co-processing is characterized in that the system comprises a fly ash washing system (1) and a waste water treatment system (2); the fly ash washing system (1) washes and dechlorinates fly ash, the dechlorinated fly ash is dried and then enters a cement kiln for treatment, and wastewater generated by washing enters a wastewater treatment system (2); after the wastewater treatment system (2) treats wastewater, the wastewater enters evaporation crystallization equipment for crystallization; sludge generated in the wastewater treatment process enters a cement kiln for treatment;
the fly ash washing system (1) comprises an ash bin (11), a pulping pool (12), a primary washing tank (13), a secondary washing tank (14), a tertiary washing tank (15) and a centrifuge (16); fly ash enters a pulping tank (12) from an ash bin (11) through pneumatic conveying, the fly ash is stirred into slurry in the pulping tank (12), the slurry sequentially passes through a first-stage water washing tank (13), a second-stage water washing tank (14) and a third-stage water washing tank (15), the first-stage water washing tank (13), the second-stage water washing tank (14) and the third-stage water washing tank (15) are used for dechlorinating while stirring the slurry, the slurry is stirred and fully precipitated, filtrate in the third-stage water washing tank (15) flows back into the second-stage water washing tank (14), filtrate in the second-stage water washing tank (14) flows back into the first-stage water washing tank (13), and the filtrate in the first-stage water washing tank (13) enters a wastewater treatment system (2); centrifuges (16) are connected to the rear parts of the first-stage water washing tank (13), the second-stage water washing tank (14) and the third-stage water washing tank (15), the centrifuges (16) send precipitates to the next water washing tank, and the precipitates finally enter a cement kiln after dechlorination and drying;
the wastewater treatment system (2) comprises a storage tank (21), a decalcification reaction tank (22), a heavy metal removal tank (23), a sedimentation tank (24), a neutralization tank (25), an adsorption tank (26), a sand filter (27) and MVR evaporation crystallization equipment (28) which are connected in sequence; waste water flowing out of the primary washing tank (13) enters a storage pool (21), the waste water is decalcified and fully precipitated in a decalcification reaction pool (22), the waste water on the upper layer enters a heavy metal removal pool (23), the metal removal pool (23) is connected with a metal precipitator, a coagulant and a coagulant aid adding device, heavy metals are precipitated under the action of the metal precipitator, the coagulant and the coagulant aid, and the waste water on the upper layer enters a neutralization pool (25); in a neutralization tank (25), acid and alkali in the wastewater are added for neutralization reaction, so that a normal pH environment required by subsequent reaction is ensured; and (3) the neutralized wastewater enters an adsorption tank (26), particles in the wastewater are adsorbed under the action of activated carbon, then the wastewater enters a sand filter (27), suspended particles are filtered out, the wastewater enters MVR evaporation crystallization equipment (28) for crystallization, and the generated condensed water flows back to a three-level washing tank (15).
2. The wet fly ash treatment system for cement kiln co-processing according to claim 1, wherein the decalcification reaction tank (22) is connected with one or more of sodium hydroxide, carbonate, silicate and phosphate adding devices; a calcium ion detection sensor is arranged in the decalcification reaction tank (22).
3. The wet fly ash treatment system for cement kiln co-processing according to claim 1, wherein the metal precipitator comprises sodium carbonate, sodium sulfide and a chelating agent; the coagulant is polyaluminium chloride; the coagulant aid is polyacrylamide.
4. The wet fly ash treatment system for cement kiln co-processing according to claim 1, wherein the lower layer sludge after decalcification is separated into decalcification filtrate and waste residue by centrifugation, the decalcification filtrate is returned to the storage tank (21), and the waste residue is treated in the cement kiln.
5. The fly ash wet processing system for cement kiln co-processing according to claim 1, wherein the acid added in the neutralization tank (25) is hydrochloric acid, and the hydrochloric acid is introduced into the pipeline at the lower part of the neutralization tank (25) to ensure that the adding position of the hydrochloric acid is below the liquid level of the solution, thereby preventing the generation of hydrochloric acid mist.
6. The wet fly ash treatment system for cement kiln co-processing according to claim 5, wherein the waste gas generated from the hydrochloric acid storage tank is introduced into the acid absorption tower, absorbed by sodium hydroxide solution, and discharged by using the high draft tube.
7. The wet fly ash treatment system for cement kiln co-processing according to claim 1, wherein the spent activated carbon deactivated in the adsorption tank (26) enters the cement kiln for processing.
8. The wet fly ash treatment system for cement kiln co-processing according to claim 1, wherein the sand filter (27) is periodically back-flushed and the back-flushing water is returned to the storage tank (21).
9. The wet fly ash treatment system for cement kiln co-processing according to claim 1, wherein the water-ash ratio in the primary water washing tank (13), the secondary water washing tank (14) and the tertiary water washing tank (15) is maintained at 2: 1-4: 1.
10. the wet fly ash treatment system for cement kiln co-processing according to claim 1, wherein tap water and stabilizer are added to the tertiary washing tank (15).
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| CN202021784745.9U CN213671059U (en) | 2020-08-24 | 2020-08-24 | Fly ash wet processing system for cooperative disposal of cement kiln |
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| CN202021784745.9U CN213671059U (en) | 2020-08-24 | 2020-08-24 | Fly ash wet processing system for cooperative disposal of cement kiln |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309026A (en) * | 2021-12-31 | 2022-04-12 | 湖南博一环保科技有限公司 | Method for dechlorinating and removing heavy salt from fly ash |
| CN114538474A (en) * | 2022-02-25 | 2022-05-27 | 绍兴市上虞众联环保有限公司 | Comprehensive treatment and application method of fly ash |
| CN114733889A (en) * | 2022-04-07 | 2022-07-12 | 深圳市小荷环保技术有限公司 | Waste incineration fly ash washing device and method |
| CN114789187A (en) * | 2022-04-27 | 2022-07-26 | 江山市虎鼎环保科技有限公司 | Landfill solidified fly ash washing system and method |
| CN114956618A (en) * | 2022-05-24 | 2022-08-30 | 安徽海螺环保集团有限公司 | Cement kiln co-processing fly ash system |
-
2020
- 2020-08-24 CN CN202021784745.9U patent/CN213671059U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309026A (en) * | 2021-12-31 | 2022-04-12 | 湖南博一环保科技有限公司 | Method for dechlorinating and removing heavy salt from fly ash |
| CN114538474A (en) * | 2022-02-25 | 2022-05-27 | 绍兴市上虞众联环保有限公司 | Comprehensive treatment and application method of fly ash |
| CN114733889A (en) * | 2022-04-07 | 2022-07-12 | 深圳市小荷环保技术有限公司 | Waste incineration fly ash washing device and method |
| CN114789187A (en) * | 2022-04-27 | 2022-07-26 | 江山市虎鼎环保科技有限公司 | Landfill solidified fly ash washing system and method |
| CN114956618A (en) * | 2022-05-24 | 2022-08-30 | 安徽海螺环保集团有限公司 | Cement kiln co-processing fly ash system |
| CN114956618B (en) * | 2022-05-24 | 2023-07-28 | 安徽海螺环保集团有限公司 | Cement kiln co-treatment fly ash system |
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