CN109386834B - Ceramsite sintering matched equipment set adopting tail gas secondary combustion process - Google Patents
Ceramsite sintering matched equipment set adopting tail gas secondary combustion process Download PDFInfo
- Publication number
- CN109386834B CN109386834B CN201811387767.9A CN201811387767A CN109386834B CN 109386834 B CN109386834 B CN 109386834B CN 201811387767 A CN201811387767 A CN 201811387767A CN 109386834 B CN109386834 B CN 109386834B
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- Prior art keywords
- secondary combustion
- ceramsite
- tail gas
- combustion chamber
- rotary kiln
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 56
- 238000005245 sintering Methods 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 57
- 230000001502 supplementing effect Effects 0.000 claims description 24
- 230000032683 aging Effects 0.000 claims description 19
- 239000002912 waste gas Substances 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000010992 reflux Methods 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 7
- 230000001877 deodorizing effect Effects 0.000 abstract description 5
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 5
- 239000000919 ceramic Substances 0.000 description 9
- 239000010815 organic waste Substances 0.000 description 8
- 238000005457 optimization Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000004332 deodorization Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
- F27B17/0041—Chamber type furnaces specially adapted for burning bricks or pottery
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a ceramsite sintering matched equipment set adopting a tail gas secondary combustion process, which belongs to the technical field of ceramsite preparation processes, and comprises a rotary kiln, wherein the rotary kiln is used for sintering ceramsite raw materials, and a tail gas outlet pipeline of the rotary kiln is provided with a reflux branch; the secondary combustion chamber is arranged at the material outlet of the rotary kiln, and sintered ceramsite is firstly introduced into the secondary combustion chamber; and the reflux branch is used for conveying part of tail gas into the secondary combustion chamber for secondary combustion and pre-cooling ceramsite in the secondary combustion chamber. The matched equipment group is used for the sintering process in the ceramsite preparation process, so that part of tail gas flows back into the secondary combustion chamber to carry out secondary combustion, the content of organic pollutants in the tail gas can be effectively reduced, the burden of subsequent deodorizing equipment is lightened, and the investment and material cost of related equipment can be reduced.
Description
Technical Field
The invention relates to the technical field of ceramsite preparation processes, in particular to a ceramsite sintering matched equipment set adopting a tail gas secondary combustion process.
Background
Ceramsite, as the name implies, is a ceramic granule. The appearance characteristics of the ceramsite are mostly round or elliptic spheres, but some broken stone-like ceramsite is not round or elliptic spheres, but is in an irregular broken stone shape, the surface of the ceramsite is a layer of hard shell, the layer of shell is ceramic or enamel, the ceramsite has the effects of water insulation and air retention, and the ceramsite is endowed with higher strength. The light weight is the most important point in many excellent performances of the ceramsite, and is also the main reason that the ceramsite can replace heavy sand to prepare light aggregate concrete and light mortar.
Ceramsite is usually formed by sintering ceramsite raw materials in a rotary kiln, when organic waste is contained in the ceramsite raw materials, incompletely combusted organic gaseous substances are usually generated in the sintering process, for example, chinese patent application No. 201710287802.9 discloses a method for preparing ceramsite by using polluted soil and industrial sludge and the prepared ceramsite, which inevitably generates incompletely combusted organic pollutants under the condition of roasting, and deodorizing equipment can be used for treating the organic pollutants in the ceramsite raw materials, but equipment investment and material (such as ozone and the like) cost are increased, and a scheme is needed to solve or improve the situation.
Disclosure of Invention
Aiming at the technical problems, the ceramsite sintering matched equipment set adopting the tail gas secondary combustion process is used for the sintering process in the ceramsite preparation process, so that part or all of tail gas flows back into a secondary combustion chamber to carry out secondary combustion, the content of organic pollutants in the tail gas can be effectively reduced, the burden of subsequent deodorizing equipment is lightened, and the investment and material cost of related equipment can be reduced.
In order to achieve the above purpose, the invention provides a ceramsite sintering matched equipment set adopting a tail gas secondary combustion process, which comprises:
the rotary kiln is used for sintering the ceramsite raw materials, and a return branch is arranged on a tail gas outlet pipeline of the rotary kiln;
the secondary combustion chamber is arranged at the material outlet of the rotary kiln, and sintered ceramsite is firstly introduced into the secondary combustion chamber;
and the reflux branch is used for conveying part of tail gas into the secondary combustion chamber for secondary combustion and pre-cooling ceramsite in the secondary combustion chamber.
The ceramic raw material can produce a large amount of incomplete organic waste gas of burning when sintering in the rotary kiln, and direct emission can pollute the environment, this application will be partly tail gas and return to the secondary combustion chamber and fully contact with the ceramic particle surface of 800~1000 ℃ and make organic waste gas carry out the secondary combustion, make the organic matter of insufficient burning have the chance to continue to decompose under the high temperature again, this scheme has reduced the content of the organic matter of tail gas, has alleviateed the burden of follow-up deodorization equipment greatly, can adopt the deodorization equipment of lower handling capacity, and then practiced thrift equipment cost, can solve the problem of ceramic particle kiln tail gas foul smell simultaneously, can also effectually prevent the production of dioxin.
The returned tail gas pre-cools the output materials, so that the ceramsite can be prevented from entering a cooling kiln to be cooled in a quenching mode after being output, and the ceramsite is easy to have flaws such as cracks and the like, and the product quality of the ceramsite is influenced; meanwhile, the reflux tail gas sweeps the ceramsite material, so that dust in the ceramsite material can be further removed.
As the optimization of the technical scheme, the mixed and proportioned raw materials are stored in the ageing material warehouse, wherein the raw materials at least comprise one of municipal sludge and industrial sludge, and in order to enable the ageing material warehouse to generate negative pressure and reduce unorganized emission, the ageing material warehouse is provided with an exhaust gas air supplementing branch, and the exhaust gas air supplementing branch inputs the volatilized exhaust gas in the ageing material warehouse into the rotary kiln for treatment. The air in the ageing material warehouse contains a large amount of organic waste gas, and the air is collected and enters the rotary kiln to be used as secondary air for supplying.
Because municipal sludge and/or industrial sludge exist in the ageing material warehouse, a large amount of organic waste gas can volatilize, and at the moment, the organic waste gas is pumped and conveyed into the rotary kiln for combustion, so that the volatilization of organic matters in the ceramsite raw material can be promoted, the content of the organic matters is reduced, the combustion supporting effect can be achieved, and further, the sintered finished product phase of the ceramsite is more perfect and the sintering is more complete; in addition, the rotary kiln needs to supplement air in the sintering process, the ceramsite firing is performed in an aerobic combustion environment, and heavy metals in raw materials can be solidified in the ceramsite in a free state in an oxide form after being subjected to aerobic combustion, so that the secondary air is supplemented through waste gas collection, sufficient oxygen is provided, organic matters in the waste gas are consumed, fuel is fully combusted, sufficient air flow is provided, and an exhaust air supplementing branch circuit just plays a role in supplementing air when the organic waste gas is conveyed to the rotary kiln, and the sintering quality of the rotary kiln is improved.
Preferably, the material outlet of the secondary combustion chamber is communicated with the cooling kiln.
As the optimization of the technical scheme, the backflow branch is provided with a backflow tail gas fan and a backflow tail gas regulating valve.
As the optimization of the technical scheme, the exhaust gas air supplementing branch is provided with an exhaust gas air supplementing fan and an exhaust gas air supplementing regulating valve.
As the optimization of the technical scheme, the aging material warehouse is not provided with openings except for a raw material inlet, a raw material outlet and a communication opening of the waste gas air supplementing branch.
Preferably, the above technical solution is that the return branch conveys all tail gas into the secondary combustion chamber for secondary combustion, and pre-cools the ceramsite in the secondary combustion chamber.
Compared with the prior art, the invention has the following advantages:
the ceramsite sintering matched equipment set adopting the tail gas secondary combustion process is used for the sintering process in the ceramsite preparation process, so that part of tail gas flows back into a secondary combustion chamber to perform secondary combustion, the content of organic pollutants in the tail gas can be effectively reduced, the burden of subsequent deodorizing equipment is reduced, and the investment and material cost of related equipment can be reduced;
after the volatile waste gas of the ageing material warehouse is introduced, the required air quantity of the rotary kiln can be more complemented, the sintered finished product phase of the ceramsite is more complete, and the sintering is more complete;
the backflow tail gas can pre-cool the materials before entering the cooling kiln, so that the quality of the ceramsite is improved, and the dust content in the ceramsite is further reduced.
Drawings
Fig. 1 is a schematic view of a ceramic sintering equipment set according to example 1.
Fig. 2 is a schematic view of a ceramic sintering equipment set according to example 2.
Fig. 3 is a schematic view of a ceramic sintering equipment set according to example 3.
Fig. 4 is a schematic view of a ceramic sintering equipment set according to example 4.
The gas flow paths in fig. 1 to 4 are all indicated by broken lines, and the solid material flow paths in fig. 3 and 4 are all indicated by solid lines.
In the figure: the device comprises an ageing material warehouse b-1, an exhaust air supplementing branch b-1.1, an exhaust air supplementing fan b-1.2, an exhaust air supplementing regulating valve b-1.3, a rotary kiln c-1, a reflux branch c-1.1, a reflux tail gas fan c-1.2, a reflux tail gas regulating valve c-1.3, a cooling kiln c-7 and a secondary combustion chamber c-8.
Detailed Description
The invention is described in further detail below in connection with specific examples:
the embodiment relates to a sintering process and a raw material storage process in a ceramsite preparation process in the ceramsite preparation process, wherein in the processes described in the embodiments, the content of organic waste which is not completely combusted in tail gas can be effectively reduced, the burden of subsequent deodorizing equipment is reduced, and the investment and material cost of related equipment can be reduced;
wherein, the embodiment 2 can complement the air quantity required by the rotary kiln and ensure that the sintered finished product phase of the ceramsite is more perfect and the sintering is more complete; example 3 the material was pre-cooled before entering the kiln, improving the quality of the ceramsite and further reducing the dust content therein.
Example 1: referring to fig. 1, a ceramsite sintering matching equipment set adopting a tail gas secondary combustion process comprises a rotary kiln c-1 for sintering ceramsite, wherein a tail gas outlet pipeline of the rotary kiln c-1 is provided with a backflow branch c-1.1, the backflow branch c-1.1 conveys part of tail gas with the temperature of about 200 ℃ back to a secondary combustion chamber c-8 for secondary combustion, the backflow branch c-1.1 is provided with a backflow tail gas fan c-1.2 for providing power and a backflow tail gas regulating valve c-1.3 for regulating flow, and the backflow tail gas fan c-1.2 is an induced draft fan;
and the exhaust gas treated by the secondary combustion chamber c-8 is summarized with the exhaust gas of the rotary kiln c-1.
The waste gas is collected and used as waste heat recovery for other purposes, such as heating of a drying kiln.
Example 2: referring to fig. 2, the ceramsite sintering kit using the tail gas secondary combustion process is different from that of example 1 in that: the system also comprises an ageing material warehouse b-1, wherein ceramsite raw materials containing municipal sludge and industrial sludge are stored in the ageing material warehouse b-1 after being mixed and proportioned, an exhaust air supplementing branch b-1.1 is arranged on the ageing material warehouse b-1, and the ageing material warehouse b-1 is not opened except a raw material inlet, a raw material outlet and a communication port with the exhaust air supplementing branch b-1.1, namely, when materials are not circulated, the ageing material warehouse b-1 is airtight;
the waste gas air supplementing branch b-1.1 inputs the volatilized waste gas in the ageing material warehouse b-1 into the rotary kiln c-1 for secondary air supplementing, and the waste gas air supplementing branch b-1.1 is provided with a waste gas air supplementing fan b-1.2 for providing power and a waste gas air supplementing regulating valve b-1.3 for regulating flow.
Example 3: referring to fig. 3, the ceramsite sintering kit using the tail gas secondary combustion process is different from that of example 2 in that: the device also comprises a cooling kiln c-7 communicated with the rear of the secondary combustion chamber c-8, and a reflux branch c-1.1 is used for conveying part of tail gas into the secondary combustion chamber c-8 to pre-cool materials in the secondary combustion chamber c-8.
Example 4: referring to fig. 4, the ceramsite sintering kit using the tail gas secondary combustion process is different from that of example 3 in that: and the reflux branch c-1.1 conveys all tail gas into the secondary combustion chamber c-8 for secondary combustion, and pre-cools ceramsite in the secondary combustion chamber c-8.
The foregoing embodiments have described the technical solutions and advantages of the present invention in detail, and it should be understood that the foregoing embodiments are merely illustrative of the present invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like that fall within the principles of the present invention should be included in the scope of the invention.
Claims (3)
1. Ceramsite sintering matched equipment set adopting tail gas secondary combustion process, which is characterized by comprising:
the rotary kiln (c-1) is used for sintering the ceramsite raw materials, and a return branch (c-1.1) is arranged on a tail gas outlet pipeline of the rotary kiln (c-1);
the secondary combustion chamber (c-8) is arranged at the material outlet of the rotary kiln (c-1), and sintered ceramsite is firstly introduced into the secondary combustion chamber (c-8);
the backflow branch (c-1.1) conveys part of tail gas into the secondary combustion chamber (c-8) for secondary combustion, and pre-cools ceramsite in the secondary combustion chamber (c-8);
the mixed and proportioned raw materials are stored in an ageing material warehouse (b-1), wherein the raw materials at least comprise one of municipal sludge and industrial sludge, the ageing material warehouse (b-1) is provided with an exhaust air supplementing branch (b-1.1), and the exhaust air supplementing branch (b-1.1) inputs the volatilized exhaust gas in the ageing material warehouse (b-1) into the rotary kiln (c-1) for treatment;
the material outlet of the secondary combustion chamber (c-8) is communicated with a cooling kiln (c-7);
the backflow branch (c-1.1) is provided with a backflow tail gas fan (c-1.2) and a backflow tail gas regulating valve (c-1.3).
2. The ceramsite sintering matched equipment set adopting tail gas secondary combustion process as set forth in claim 1, wherein: the exhaust air supplementing branch (b-1.1) is provided with an exhaust air supplementing fan (b-1.2) and an exhaust air supplementing regulating valve (b-1.3).
3. The ceramsite sintering matched equipment set adopting tail gas secondary combustion process as set forth in claim 1, wherein: the aging warehouse (b-1) is not provided with openings except for a raw material inlet, a raw material outlet and a communication opening with the waste gas air supplementing branch (b-1.1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387767.9A CN109386834B (en) | 2018-11-21 | 2018-11-21 | Ceramsite sintering matched equipment set adopting tail gas secondary combustion process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387767.9A CN109386834B (en) | 2018-11-21 | 2018-11-21 | Ceramsite sintering matched equipment set adopting tail gas secondary combustion process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109386834A CN109386834A (en) | 2019-02-26 |
| CN109386834B true CN109386834B (en) | 2023-12-22 |
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| CN201811387767.9A Active CN109386834B (en) | 2018-11-21 | 2018-11-21 | Ceramsite sintering matched equipment set adopting tail gas secondary combustion process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114370759B (en) * | 2022-01-14 | 2023-08-25 | 天津水泥工业设计研究院有限公司 | Low-energy-consumption system and process for preparing ceramsite by utilizing solid waste |
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| CN107843110A (en) * | 2017-11-29 | 2018-03-27 | 浙江大东吴集团建设新材料有限公司 | A kind of heated air circulation type Expanded Clay Rotary Kilns |
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| CN209672353U (en) * | 2018-11-21 | 2019-11-22 | 浙江大东吴集团建设有限公司 | Using the ceramisite sintered corollary equipment group of tail gas secondary combustion process |
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2018
- 2018-11-21 CN CN201811387767.9A patent/CN109386834B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4102700A (en) * | 1975-08-27 | 1978-07-25 | Perlmooser Zementwerke Aktiengesellschaft | Process for the production of a mixture to be utilized in the production of building materials and a device for carrying out the process |
| JP2003161411A (en) * | 2001-11-28 | 2003-06-06 | Babcock Hitachi Kk | Slag melting system |
| CN102206091A (en) * | 2010-03-10 | 2011-10-05 | 东南大学 | Method for making ceramsite by using sludge |
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| CN109386834A (en) | 2019-02-26 |
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