CN1113212C - External decomposition technology for waste heat generating technology of cement kiln - Google Patents
External decomposition technology for waste heat generating technology of cement kilnInfo
- Publication number
- CN1113212C CN1113212C CN 96107067 CN96107067A CN1113212C CN 1113212 C CN1113212 C CN 1113212C CN 96107067 CN96107067 CN 96107067 CN 96107067 A CN96107067 A CN 96107067A CN 1113212 C CN1113212 C CN 1113212C
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- CN
- China
- Prior art keywords
- kiln
- fluidized bed
- heat generating
- bed calciner
- technology
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to an external decomposition technology for a waste heat generating technology of a cement kiln, which is characterized in that both kiln fume and raw material are operated and run by the technology system at negative pressure; a circulation process outside the kiln of partial material is realized. The present invention can increase the kiln yield by more than 80% and increase generated energy by 30 to 40 %; the present invention can be used for large-scale production.
Description
The present invention relates to a kind of method that is used for cement kiln residual heat generating, belong to pre-burning manufacturing cement in fluid bed, utilize a kind of improvement of kiln fume afterheat electricity-generating method simultaneously.
Precal cination technique is a kind of burning clinker of cement new technology that grows up the seventies, this method is to have set up a dore furnace between suspended preheater and rotary kiln, the fuel of adding about 60% in stove, make the exothermic process of fuel combustion and the endothermic process of raw material carbonate decomposition, make it promptly carry out heat exchange with suspended state or fluidisation attitude form, thereby the resolution ratio that makes the kiln raw material is brought up to more than 75%, has reduced the thermic load of rotary kiln thus, has improved the productivity ratio of kiln again.
Utilize the cement kiln residual heat generating technology, prior art all adopts the technology pattern of traditional hollow kiln band waste heat boiler, and this technological process kiln output is little, efficient is low, hear rate is high, generating production line small scale.Though the patent 85100898 of my institute's earlier application adopts the fluidization principle that cold wind, cold burden are directly sent into dore furnace, save 4 to 5 grades of preheaters, but its technological process is not perfect, the kiln flue gas of this patent is not by decomposition furnace system, and raw material are gone into kiln after partly decomposing through dore furnace, and the remainder raw material are directly into kiln, this patent adopts positive pressure operation, the used combustion air of dore furnace is the normal temperature air that blower fan blasts, and hear rate is still high, and system scale is again little.
The objective of the invention is: improve technological process, make full use of the kiln fume afterheat, improve raw material resolution ratio and kiln output, cut down the consumption of energy simultaneously, increase economic efficiency.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of method of utilizing cement kiln residual heat generating, its characteristics are:
1) total system moves under negative-pressure operation, and raw material, coal dust directly enter fluidized bed calciner, goes into fluidized bed calciner from the hot blast that kiln hood extracts through tertiary-air pipe, goes out kiln exit gas and enters the fluidized bed calciner middle part;
2) all or part of feeding fluidized bed calciner of raw material, after preheating, the decomposition, the mixing of materials gas that comes out from fluidized bed calciner carries out the separation of gas material through 1～3 grade of rotoclone collector, and the material of accepting is gone into kiln, and high-temperature flue gas enters the waste heat boiler generating.
The method of above-mentioned cement kiln residual heat generating, its characteristics are: described rotoclone collector is a two-stage.
The method of above-mentioned cement kiln residual heat generating, its characteristics are: high temperature ratio tripper is set under first order rotoclone collector, makes part or all of material go into fluidized bed calciner again according to running situation, realize the outer circulation of part decomposition material stove.
Accompanying drawing 1 is technological process of the present invention
Accompanying drawing 2 is dore furnace schematic diagram of the present invention
As shown in Figure 1: rotary kiln 1, roots blower 2, fluidized bed calciner 3, one-level rotoclone collector 4, secondary rotoclone collector 5, waste heat boiler 6, Turbo-generator Set 7, air-introduced machine 8, cottrell 9, high temperature ratio tripper 10.
Advantage of the present invention:
1. fluidized bed calciner moves under negative-pressure operation, raw material preheating and decomposition under 850 ℃ of-900 ℃ of temperature, The Decomposition of Calcium Carbonate rate is reached more than 75%, kiln output increased 80%.
2. existing hollow kiln dust contained flue gas is big, and system air leakage is big, and dust stratification is many, affects waste heat boiler efficient and rule Mould, efficient cyclone dust-precipitator gross efficiency reaches about 95% in the system of the present invention, so Gas Parameters is stable, the flow height, EGT can improve generated energy 30-40% up to 850 ℃. The present invention can be with horizontal or vertical exhaust-heat boiler is supporting, And scale and benefit are arranged, improved the cogeneration integral level.
3. save 4-5 level pre-heating device, saved equipment investment.
The embodiment of the invention:
By the technological process shown in the accompanying drawing 1, at present just in cement plant, Huhehaote City 2
#Kiln is implemented.Raw material directly feed fluidized bed calciner without preheater, the coal dust of burning usefulness directly feeds fluidized bed calciner by delivery pump from kiln hood, the coal dust of burning usefulness directly feeds the dore furnace bottom by delivery pump from kiln hood, required combustion air major part extracts hot blast by tertiary-air pipe from kiln hood and provides, the fluidized wind of dore furnace is blasted from the bottom by roots blower, go out kiln exit gas and enter the dore furnace middle part, raw material preheating in dore furnace is also decomposed the back and is accepted into kiln by the secondary rotoclone collector, this system can make the raw material resolution ratio reach more than 75%, for the thermal efficiency and the operational stability that improves dore furnace, again return dore furnace by the partial material that the one-level rotoclone collector is accepted by the control of high temperature ratio tripper, form the stove outer circulation with this, go into the usefulness of waste heat boiler for generating by the high-temperature flue gas (about 850 ℃) of secondary rotoclone collector.
Claims (3)
1. method that is used for cement kiln residual heat generating is characterized in that:
1) total system moves under negative-pressure operation, and raw material, coal dust directly enter fluidized bed calciner, goes into fluidized bed calciner from the hot blast that kiln hood extracts through tertiary-air pipe, goes out kiln exit gas and enters the fluidized bed calciner middle part;
2) all or part of feeding fluidized bed calciner of raw material, after preheating, the decomposition, the mixing of materials gas that comes out from fluidized bed calciner carries out the separation of gas material through 1～3 grade of rotoclone collector, and the material of accepting is gone into kiln, and high-temperature flue gas enters the waste heat boiler generating.
2. the method for cement kiln residual heat generating according to claim 1, it is characterized in that: described rotoclone collector is a two-stage.
3. the method for cement kiln residual heat generating according to claim 1, it is characterized in that: high temperature ratio tripper is set under first order rotoclone collector, make part or all of material go into fluidized bed calciner again according to running situation, realize the outer circulation of part decomposition material stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96107067 CN1113212C (en) | 1996-07-15 | 1996-07-15 | External decomposition technology for waste heat generating technology of cement kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96107067 CN1113212C (en) | 1996-07-15 | 1996-07-15 | External decomposition technology for waste heat generating technology of cement kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1146546A CN1146546A (en) | 1997-04-02 |
| CN1113212C true CN1113212C (en) | 2003-07-02 |
Family
ID=5119506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96107067 Expired - Fee Related CN1113212C (en) | 1996-07-15 | 1996-07-15 | External decomposition technology for waste heat generating technology of cement kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1113212C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571573B (en) * | 2008-09-10 | 2012-10-24 | 安徽海螺川崎工程有限公司 | Method for testing power generating performance of waste heat of cement kiln |
| CN101608866B (en) * | 2009-07-24 | 2010-08-25 | 天津水泥工业设计研究院有限公司 | Predecomposition kiln tail system outside of cement kiln, which can treat raw materials with combustibles |
| CN105276573B (en) * | 2015-12-01 | 2017-09-15 | 天津德诚志成水泥建材技术咨询服务有限公司 | Wind coal charge is classified low nitrogen burning equipment and technology and cement clinker burning system |
-
1996
- 1996-07-15 CN CN 96107067 patent/CN1113212C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1146546A (en) | 1997-04-02 |
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