CN110906752A - Kiln tail bypass processing system that leaks informaton suitable for cement kiln - Google Patents

Kiln tail bypass processing system that leaks informaton suitable for cement kiln Download PDF

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Publication number
CN110906752A
CN110906752A CN201911309254.0A CN201911309254A CN110906752A CN 110906752 A CN110906752 A CN 110906752A CN 201911309254 A CN201911309254 A CN 201911309254A CN 110906752 A CN110906752 A CN 110906752A
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CN
China
Prior art keywords
flue gas
kiln
fly ash
smoke
treatment system
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CN201911309254.0A
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Chinese (zh)
Inventor
方明
张冬冬
王朝雄
刘亚雷
陈慧
周海叶
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NANJING KAISHENG KAINENG ENVIRONMENTAL ENERGY SOURCES CO Ltd
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NANJING KAISHENG KAINENG ENVIRONMENTAL ENERGY SOURCES CO Ltd
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Priority to CN201911309254.0A priority Critical patent/CN110906752A/en
Publication of CN110906752A publication Critical patent/CN110906752A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001Extraction of waste gases, collection of fumes and hoods used therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases

Abstract

The invention discloses a kiln tail bypass air-bleeding treatment system suitable for a cement kiln, which comprises a garbage storage, an incinerator, a decomposing furnace and a cement kiln system, wherein the garbage storage transports solid garbage to the incinerator for treatment, the incinerator is connected with the decomposing furnace, the cement kiln system comprises a grate cooler and a rotary kiln, and further comprises a kiln tail smoke chamber, a smoke quenching system, a fly ash recycling treatment system and a smoke air treatment system, wherein the kiln tail smoke chamber is connected with the rotary kiln, a cold odor inlet of the smoke quenching system is connected with the garbage storage, and a smoke inlet of the smoke quenching system is connected with a smoke air outlet of the kiln tail smoke chamber And (3) after agglomeration, feeding the mixture into a melting furnace for heating and melting, and finally generating the high-added-value rock wool through a cotton forming workshop to realize waste utilization of fly ash.

Description

Kiln tail bypass processing system that leaks informaton suitable for cement kiln
Technical Field
The invention relates to the field of cement production and garbage cooperative treatment, in particular to a kiln tail bypass air discharge treatment system suitable for a cement kiln.
Background
Along with the improvement of living standard of people, the production amount of household garbage is more and more. At present, the stock of municipal solid waste in China reaches 60 hundred million tons, occupies 5 hundred million square meters of cultivated land, and still rapidly increases at a speed of 9 percent. These huge amounts of domestic waste have posed a growing threat to the urban and periurban ecological environment. The cement kiln is used for cooperatively treating the urban domestic garbage, so that the advantages of reduction and recycling are obvious, on one hand, a cement burning system can be used for digesting part of high-temperature waste gas generated in the garbage treatment process to be used as a supplementary heat source or a whole heat source for garbage burning, the garbage burning process is more sufficient, and the emission of dioxin is further reduced; on the other hand, ash generated by burning the garbage can be used as a cement admixture, and toxic substances in the garbage can be decomposed into corresponding inorganic substances and heavy metals to be solidified in cement clinker. By 2019, more than 20 provinces have been built or are advancing to build cement kilns to dispose garbage, 150 production lines of sludge, dangerous waste and the like in China, and the production lines respectively comprise: 53 garbage disposal lines with the disposal capacity of 600 ten thousand tons; 45 sludge disposal lines with the disposal capacity of 325 ten thousand tons; 52 dangerous waste disposal lines with the disposal capacity of 341 ten thousand tons.
The garbage in China is not strictly classified, and the concentration of chloride ions in the garbage is generally higher. When the cement kiln is used for cooperatively treating solid waste garbage, generated chloride is circularly enriched in a kiln line, so that the phenomena of ring formation, balling, material blockage of a preheater and the like of a kiln system are easily caused, and related data show that the content of chloride ions in the kiln is too high, the compressive strength of cement clinker is reduced to a certain degree, the quality of cement is influenced, the content of chloride ions in the cement is specifically specified in GB 175-2007 Universal Portland Cement, and the content of chloride in ordinary Portland cement is usually controlled to be not higher than 0.6 g/kg. In order to ensure the operation rate of system equipment and the quality of clinker, the content of chlorine in fly ash co-processed by the cement kiln needs to be strictly controlled. At present, the cement kiln dechlorination mainly adopts a bypass air release mode, and the kiln tail smoke chamber (chloride enrichment area) is subjected to concentrated air release so as to reduce the enrichment amount of chloride ions in a rotary kiln system, improve the equipment operation rate and ensure the product quality. Generally, the bypass air release rate is about 5% of the total flue gas amount at the tail of the kiln.
When the bypass is ventilated, dioxin does not exist in high-temperature dust-containing smoke extracted from a kiln tail smoke chamber, in order to inhibit the dioxin from being formed again, a proper amount of cold air is blown in through an quenching fan, the smoke is rapidly cooled to below 250 ℃, meanwhile, harmful components can be crystallized and attached to dust, separation of fly ash and the smoke is realized through a bag-type dust remover, and the collected fly ash is conveyed to an ash storage bin. The fly ash collected by the dust remover in the waste synergistic bypass air release system is a main attachment of a large amount of low-volatile heavy metal chlorine salt and part of dioxin, is similar to the fly ash of waste incineration, and belongs to high-chlorine dangerous waste. The environmental protection technical specification of the co-processing of solid wastes in the cement kiln (HJ662-2013) stipulates that dust collected by the air release of a bypass cannot return to the cement kiln to produce clinker. At present, no economic and thorough treatment mode exists for fly ash treatment, and the fly ash treatment is a new problem for enterprises under the large background that the reduction cannot be realized by a main treatment mode of harmless treatment and landfill and the approval of a flexible landfill site is difficult.
Disclosure of Invention
In order to solve the problems, the invention provides a kiln tail bypass air-bleeding treatment system suitable for a cement kiln, which comprises a garbage storage, an incinerator, a decomposing furnace and a cement kiln system, wherein the garbage storage transports solid garbage to the incinerator for treatment, the incinerator is connected with the decomposing furnace, the cement kiln system comprises a grate cooler and a rotary kiln, and further comprises a kiln tail smoke chamber, a smoke quenching system, a fly ash recycling treatment system and a smoke air treatment system, the kiln tail smoke chamber is connected with the rotary kiln, the smoke quenching system comprises a cold odor inlet and a smoke inlet, the cold odor inlet of the smoke quenching system is connected with the garbage storage, the smoke inlet of the smoke quenching system is connected with the smoke air outlet of the kiln tail smoke chamber, the smoke outlet of the smoke quenching system is respectively connected with the smoke air inlets of the fly ash recycling treatment system and the grate cooler, the fly ash recycling treatment system is connected with the smoke and air treatment system.
The flue gas quenching system comprises a quenching fan and a flue gas quenching device, the quenching fan is connected with the flue gas quenching device, a hot flue gas inlet of the flue gas quenching device is connected with a kiln tail flue gas chamber, a flue gas outlet of the flue gas quenching device is connected with a fly ash recycling treatment system, and the quenching fan can pump cold odor in the garbage storage into the flue gas quenching device.
The fly ash recycling treatment system comprises a first dust remover, a fly ash storage bin, an auxiliary material bin, an extrusion agglomeration device, a material distribution device, a melting furnace and a cotton forming workshop, wherein a smoke air inlet of the dust remover is connected with a smoke quenching device, a smoke air outlet of the first dust remover is connected with a grate cooler, a fly ash outlet of the first dust remover is connected with the fly ash storage bin, a fly ash inlet of the extrusion agglomeration device is connected with the fly ash storage bin, an auxiliary material inlet of the extrusion agglomeration device is connected with the auxiliary material bin, an outlet of the extrusion agglomeration device is connected with the material distribution device and the melting furnace, a discharge port of the melting furnace is connected with the cotton forming workshop, and a smoke air outlet of the melting furnace is connected with a smoke air treatment system.
The flue gas and air treatment system comprises a second dust remover, a secondary fly ash storage bin, a dangerous waste landfill site and an induced draft fan, wherein a flue gas and air inlet of the second dust remover is connected with the melting furnace, a flue gas and air outlet of the second dust remover is connected with the combustion furnace through the induced draft fan, a fly ash outlet of the second dust remover is connected with the secondary fly ash storage bin, and a fly-back outlet of the secondary fly ash storage bin is connected with the dangerous waste landfill site.
The temperature of the flue gas after mixed and cooled by the flue gas quenching device is lower than 250 ℃.
The smoke discharge temperature of the outlet of the melting furnace top is 100-120 ℃.
The melting furnace adopts a cold top feeding material distribution mode, and a solid layer, a semi-solid layer and a melting layer are sequentially arranged from the upper layer to the lower layer.
The melting furnace adopts an electric melting furnace.
The invention has the following beneficial effects:
(1) the cold odor in the garbage storehouse replaces clean air to enter the flue gas quenching system as quenching cooling air, so that the generation amount of harmful flue gas is reduced, the mixed harmful flue gas is dedusted and then sent to the high-temperature section of the cement kiln grate cooler for decomposition, and the harmless treatment of waste gas is realized.
(2) The high-chlorine harmful fly ash collected by the bypass air discharge and auxiliary material ingredients are reasonably proportioned, then are sent into a melting furnace to be melted into liquid, and then are processed into the rock wool with high added value through a wool-forming workshop, so that the process of changing the harmful fly ash into valuable is realized, and considerable economic value can be generated.
(3) The melting furnace adopts an electric melting furnace, the secondary fly ash is generated in a small amount in a cold top distribution mode, and the reduced secondary fly ash is sent to a dangerous waste landfill site for landfill after chelation harmless treatment.
(4) Harmful flue gas discharged by the melting furnace replaces cold air and is sent into the waste incinerator to be used as cooling air of the heating surface of the hearth, and the treatment cost and equipment investment of the part of flue gas are reduced.
Drawings
FIG. 1 is a process flow diagram of the system of the present invention;
shown in the figure: 1-a waste storage; 2-an incinerator; 3-decomposing furnace; 4-grate cooler; 5-a rotary kiln; 6-kiln tail smoke chamber; 7-a quench fan; 8-flue gas quenching device; 9-a first dust remover; 10-fly ash storage; 11-an auxiliary material bin; 12-an extrusion agglomeration device; 13-a material distribution device; 14-a melting furnace; 15-cotton forming workshop; 16-a second precipitator; 17-secondary fly ash storage; 18-hazardous waste landfill site; 19-a draught fan.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and examples.
The kiln tail bypass air discharge treatment system suitable for the cement kiln to cooperatively treat the garbage is matched with a cement kiln to cooperatively treat the garbage system for use, and comprises a flue gas quenching system, a fly ash recycling treatment system and a flue gas air treatment system; the invention overcomes the problem of disposing a large amount of high-chlorine harmful fly ash in the kiln tail bypass air discharge treatment system while ensuring the dechlorination effect, and realizes harmless disposal of harmful gas by fully utilizing the coupling among the systems.
As shown in fig. 1, the kiln tail bypass air discharge treatment system suitable for the cement kiln to cooperatively treat the garbage comprises a garbage storage 1, a garbage incinerator 2, a decomposing furnace 3, a kiln tail smoke chamber 6, a rotary kiln 5 and a grate cooler 4; the flue gas quenching system comprises a quenching fan 7 and a flue gas quenching device 8, wherein the inlet of the quenching fan 7 is connected with the garbage storage 1; the fly ash recycling treatment system comprises a fly ash storage bin 10, an auxiliary material bin 11, an extrusion agglomeration device 12, a material distribution device 13, a melting furnace 14 and a cotton forming workshop 15, wherein the fly ash storage bin 10 is connected with a first dust remover 9 and is arranged in parallel with the auxiliary material bin 11; the smoke and air treatment system comprises a first dust remover 9, a second dust remover 16, a secondary fly ash storage bin 17 and an induced draft fan 19.
The cooling air of the flue gas quenching device 8 of the embodiment comes from the cold odor of the garbage storage 1, so that the additional clean air entering the system is reduced, and the temperature of the mixed flue gas is lower than 250 ℃. In the fly ash recycling disposal system, the melting furnace 14 is an electric melting furnace, the melting furnace 14 adopts a cold top feeding material distribution mode, a solid layer, a semi-solid layer and a melting layer are sequentially arranged from the upper layer to the lower layer, and the smoke exhaust temperature of the top outlet of the melting furnace 14 is 100-120 ℃. The high-temperature molten ash generated by the melting furnace 14 is sent to a cotton forming workshop 15 to produce high value-added rock wool. Auxiliary materials are required to be added in rock wool production, the auxiliary materials in the auxiliary material bin 11 mainly comprise low-melting-point salts, silica sand, borax and the like, the material ratio of the ingredients is calculated according to the chemical component proportion of fly ash and rock wool, and the proportioned mixture is pressed into blocks through an extrusion agglomeration device 12.
In the flue gas treatment system, a flue gas outlet of a first dust remover 9 is connected with the high-temperature section of the grate cooler 4 to decompose and absorb organic harmful ingredients in odor; the smoke outlet of the second dust remover 16 is sent to the garbage incinerator 2 to replace cold air to be used as cooling air of the heating surface of the hearth. In the smoke and wind disposal system, the secondary fly ash storage 17 is used for collecting secondary fly ash collected by the second dust collector 16, the amount of the secondary fly ash is about 1% of the total amount of the fly ash, and the reduced fly ash is finally sent to a hazardous waste landfill 18 after being chelated and innocent treated.
In addition, the kiln tail bypass air discharging system is also suitable for the cement kiln to cooperatively treat dangerous waste.
The embodiment provides a kiln tail bypass air discharge treatment system and method suitable for cooperatively treating garbage in a cement kiln, which specifically comprise the following steps:
when the cement kiln is used for cooperatively treating garbage, high-chlorine flue gas is enriched in the kiln tail smoke chamber 6, high-temperature flue gas with the temperature of 900-plus 1000 ℃ discharged by the bypass air release opening is quenched and cooled to about 250 ℃ by cold odor extracted from the garbage storage 1 in the flue gas quenching device 8, and after dust is removed by the first dust remover 9, harmful flue gas is sent to the high-temperature section of the cement kiln grate cooler 4 for decomposition; high chlorine hazardous fly ash is captured in fly ash silo 10. The fly ash in the fly ash storage bin 10 and the auxiliary materials in the auxiliary material bin 11 are pressed into a briquette by an extrusion briquetting device 12 after being mixed according to the components, the briquette is sent into a melting furnace 14 of cold top distribution for heating, and the high-temperature liquid slag melted by heating is sent into a cotton forming workshop 15 to be processed into the rock wool with high added value; a small amount of harmful flue gas generated by melting the fly ash is dedusted by the second deduster 16 and used as cooling air of the heating surface of the hearth of the garbage incinerator 2, a small amount of secondary fly ash collected by the second deduster 16 is stored in a secondary fly ash storage bin 17, and finally the secondary fly ash is chelated and harmless and then sent to a dangerous landfill 18 for landfill disposal.

Claims (8)

1. The utility model provides a kiln tail bypass processing system that leaks informaton suitable for cement kiln, includes garbage storage storehouse (1), burns burning furnace (2), dore furnace (3), cement kiln system, garbage storage storehouse (1) transports solid waste to burn burning furnace (2) and handles, it links to each other with dore furnace (3) to burn burning furnace (1), cement kiln system includes grate cooler (4) and rotary kiln (5), its characterized in that still includes kiln tail smoke chamber (6), flue gas rapid cooling system, flying dust resourceful processing system and flue gas processing system, kiln tail smoke chamber (6) link to each other with rotary kiln (5), flue gas rapid cooling system includes cold foul gas entry and flue gas entry, the cold foul gas entry of flue gas rapid cooling system links to each other with garbage storage storehouse (1), the flue gas entry of flue gas rapid cooling system links to each other with the flue gas outlet of kiln tail smoke chamber (6), the flue gas outlet of flue gas rapid cooling system links to each other with flying dust resourceful processing system and the flue gas wind of cooler (4) The inlet is connected, and the fly ash recycling disposal system is connected with the smoke and air treatment system.
2. The kiln tail bypass air-bleeding treatment system suitable for the cement kiln as claimed in claim 1, wherein the flue gas quenching system comprises a quenching fan (7) and a flue gas quenching device (8), the quenching fan (7) is connected with the flue gas quenching device (8), the hot flue gas inlet of the flue gas quenching device (8) is connected with the kiln tail flue gas chamber (6), the flue gas outlet of the flue gas quenching device (8) is connected with a fly ash recycling treatment system, and the quenching fan (7) can pump the cold odor gas in the garbage storage (1) into the flue gas quenching device (8).
3. The kiln tail bypass air-bleeding treatment system suitable for the cement kiln according to claim 2, characterized in that the fly ash recycling treatment system comprises a first dust collector (9), a fly ash storage bin (10), an auxiliary material bin (11), an extrusion agglomeration device (12), a material distribution device (13), a melting furnace (14) and a cotton-forming workshop (15), wherein a flue gas inlet of the dust collector (9) is connected with a flue gas quenching device (8), a flue gas outlet of the first dust collector (9) is connected with the grate cooler (4), a fly ash outlet of the first dust collector (9) is connected with the fly ash storage bin (10), a fly ash inlet of the extrusion agglomeration device (12) is connected with the fly ash storage bin (10), an auxiliary material inlet of the extrusion agglomeration device (12) is connected with the auxiliary material bin (11), an outlet of the extrusion agglomeration device (12) is connected with the material distribution device (13) and the melting furnace (14), the discharge hole of the melting furnace (14) is connected with a cotton forming workshop (15), and the smoke and air outlet of the melting furnace (14) is connected with a smoke and air treatment system.
4. The kiln tail bypass air discharge treatment system suitable for the cement kiln, according to claim 3, characterized in that the flue gas treatment system comprises a second dust collector (16), a secondary fly ash storage bin (17), a hazardous waste landfill site (18) and an induced draft fan (19), wherein a flue gas inlet of the second dust collector (16) is connected with the melting furnace (14), a flue gas outlet of the second dust collector (16) is connected with the incinerator (2) through the induced draft fan (19), a fly ash outlet of the second dust collector (16) is connected with the secondary fly ash storage bin (17), and a fly return outlet of the secondary fly ash storage bin (17) is connected with the hazardous waste landfill site (18).
5. The kiln tail bypass air discharge treatment system suitable for the cement kiln according to claim 2, characterized in that the temperature of the flue gas after mixing and cooling by the flue gas quenching device (8) is lower than 250 ℃.
6. The kiln tail bypass air discharge treatment system suitable for the cement kiln according to the claim 3, characterized in that the temperature of the top outlet smoke of the melting furnace (14) is 100-120 ℃.
7. The kiln tail bypass air discharge treatment system suitable for the cement kiln according to the claim 3, characterized in that the melting furnace (14) adopts a cold top feeding material distribution mode, and the solid layer, the semi-solid layer and the melting layer are arranged from the upper layer to the lower layer in sequence.
8. The kiln tail bypass air discharge treatment system suitable for the cement kiln according to the claim 3, characterized in that the melting furnace (14) adopts an electric melting furnace.
CN201911309254.0A 2019-12-18 2019-12-18 Kiln tail bypass processing system that leaks informaton suitable for cement kiln Pending CN110906752A (en)

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CN201911309254.0A CN110906752A (en) 2019-12-18 2019-12-18 Kiln tail bypass processing system that leaks informaton suitable for cement kiln

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Application Number Priority Date Filing Date Title
CN201911309254.0A CN110906752A (en) 2019-12-18 2019-12-18 Kiln tail bypass processing system that leaks informaton suitable for cement kiln

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114739178A (en) * 2022-04-18 2022-07-12 徐荣 Device and method for harmless treatment of waste incineration fly ash

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114739178A (en) * 2022-04-18 2022-07-12 徐荣 Device and method for harmless treatment of waste incineration fly ash

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