CN1186285C - Method for reducing nitrogen oxide exhaust of cement kiln - Google Patents
Method for reducing nitrogen oxide exhaust of cement kiln Download PDFInfo
- Publication number
- CN1186285C CN1186285C CNB031299326A CN03129932A CN1186285C CN 1186285 C CN1186285 C CN 1186285C CN B031299326 A CNB031299326 A CN B031299326A CN 03129932 A CN03129932 A CN 03129932A CN 1186285 C CN1186285 C CN 1186285C
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- Prior art keywords
- compressed air
- ammonia water
- liquid
- pump station
- pressure
- 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.)
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 239000004568 cement Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 22
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 39
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 39
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 16
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 102100032040 Amphoterin-induced protein 2 Human genes 0.000 claims 1
- 101000776165 Homo sapiens Amphoterin-induced protein 2 Proteins 0.000 claims 1
- KWYCPUNAAYFHAK-UHFFFAOYSA-N N-(2,6-Dimethylphenyl)-4-[[(diethylamino)acetyl]amino]benzamide Chemical compound C1=CC(NC(=O)CN(CC)CC)=CC=C1C(=O)NC1=C(C)C=CC=C1C KWYCPUNAAYFHAK-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000354 decomposition reaction Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 229910052755 nonmetal Inorganic materials 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The present invention relates to a method for reducing the discharge of nitrogen oxides of cement kilns, which belongs to the technical field of inorganic non-metal materials. The present invention is characterized in that a nozzle on a spray gun is put on an area at temperature to 850 DEG C to 1050 DEG C on the upper part of a cement predecomposition system decomposition kiln to cause ammonia water whose concentration is from 20% to 25% to flow to a liquid and gas supplying pump station through a first level pressurizing pump from a storage tank; compressed air flows to the liquid and gas supplying pump station through a compressed air pipeline; the supply quantity of the ammonia water is determined according to the condition that the ratio of NH3 to NO is 1.3 to 2.0 in a control system, and the quantity of the compressed air is automatically adjusted according to ammonia spraying quantity; the ammonia water whose pressure is from 0.5 to 5 kg/cm<2> and the compressed air whose pressure is from 0.5 to 5 kg/cm<2> are simultaneously supplied to the spray gun by the pump station; the nozzle on the spray gun sprays micro atomized liquid drops with an average particle diameter of 10 to 20 mu m to the area on the upper part of the cement predecomposition system decomposition kiln. The present invention has the characteristics that the method can not be limited by the production technology, and the discharge of nitrogen oxides can be greatly reduced.
Description
Technical Field
The invention belongs to the field of inorganic non-metallic materials, and particularly relates to a method for reducing nitrogen oxide emission of a cement kiln.
Background
With the continuous development of scientific and technological progress and the continuous improvement of the living standard of people in China, the building industry becomes the main investment field of national economic development. The cement is one of the indispensable materials in the building industry, so the demand is increasing, and the ecological environment of the earth is seriously damaged by the atmospheric pollution caused by nitrogen oxides discharged by the production of the cement. According to statistics, the cement industry has become a consumer for discharging nitrogen oxides equivalent to automobile exhaust after the power industry, and the main measures of reducing the nitrogen oxides in the cement kiln are as follows: the method has low cost, but has a certain limit for reducing the nitrogen oxides because the cement production technology must not be influenced.
Disclosure of Invention
The invention aims to solve the problems of environmental pollution caused by the production of nitrogen oxide in cement production and the problem of certain limit of nitrogen oxide reduction in the prior art, and provides a method for reducing the nitrogen oxide emission of a cement kiln, which adopts a waste gas denitration technology, is not limited by a production process, has large nitrogen oxide reduction amplitude, can flexibly select parameters according to the emission standard requirement, is convenient to operate and has a simple process.
The technical scheme adopted by the invention for solving the problems in the prior art is as follows: a method for reducing nitrogen oxide emission of a cement kiln is characterized by comprising the following steps: in the area with the upper temperature of 850-1050 ℃ of a cement predecomposition system decomposing furnace, a nozzle on a spray gun is placed in the area, valve bodies on an ammonia water pipeline and a compressed air pipeline are respectively opened, ammonia water with the weight concentration of 20-25% flows to a liquid and gas supply pump station from a storage tank through a primary booster pump, compressed air flows to the liquid and gas supply pump station through the compressed air pipeline, liquid and gas supply pumps of the ammonia water pipeline and the compressed air pipeline are respectively adjusted, and the ammonia water supply amount is controlled according to NH in a system3The mol ratio of NO to NO is determinedto be 1.3-2.0, the amount of compressed air is automatically adjusted by the ammonia spraying amount, the pressure and the flow are in a linear proportional relation, and the pump station enables the pressure to be 0.5-5 kg/cm2While the pressure is 0.5-5 kg/cm2The compressed air is supplied to a spray gun, and the adjusted ammonia water and the compressed air are sprayed out to form fine atomized liquid drops with the average particle size of 10-20 mu m to the upper area of a cement predecomposition system decomposing furnace through a nozzle on the spray gun.
The invention can also be realized by adopting the following technical measures:
the method for reducing the emission of nitrogen oxides in the cement kiln is characterized in that ammonia water filtered by a filter in an ammonia water storage tank flows to a primary booster pump through an ammonia water pipeline controlled by a manual stop valve and a flanged spherical cock valve.
The method for reducing nitrogen oxide emission of the cement kiln is characterized in that ammonia water passing through a pressure pump respectively flows through a one-way valve and a flanged spherical plug valve through an ammonia water pipeline, pressure is controlled by a pressure gauge on the flanged spherical plug valve to enable the ammonia water to flow to a liquid and gas supply pump station, redundant ammonia water flows back through the flanged spherical plug valve, the one-way valve and a manual stop valve in a loop and respectively flows through the one-way valve and the flanged spherical plug valve, the pressure gauge on the flanged spherical plug valve controls the pressure to enable the ammonia water to flow to the liquid and gas supply pump station, and the redundant ammonia water flows back to an ammonia water storage tank through the flanged spherical plug valve, the one-.
The methodfor reducing the emission of nitrogen oxides in the cement kiln is characterized in that the compressed air comes from a compressed air pipe network, and the pressure is controlled by a pressure gauge on a spherical plug valve with a flange, so that the compressed air flows to a liquid and gas supply pump station.
The method for reducing the emission of nitrogen oxides in the cement kiln is characterized in that the compressed air is kept normally open.
The invention has the advantages and positive effects that: the method for reducing the emission of nitrogen oxides in the cement kiln adopts the technical scheme of the invention, and the nitrogen oxides in the cement kiln are reduced by ammonia to be converted into N2The method is not limited by the production process, greatly reduces the nitrogen oxide, reduces the environmental pollution to the earth, can flexibly select parameters according to the emission standard reaching requirements, and has convenient operation and simple process.
Drawings
FIG. 1 is a system flow diagram of a method of reducing nitrogen oxide emissions from a cement kiln according to the present invention;
FIG. 2 is a view showing a position of the lance in the decomposing furnace;
fig. 3 is a top view of fig. 2.
The reference numerals in the figures are respectively: 1 is an ammonia water storage tank, 2 is a filter, 3 is a manual stop valve, 4 is a spherical plug valve with a flange, 5 is a primary booster pump, 6 is a one-way valve, 7 is a pressure gauge, 8 is a spray gun, 9 is a nozzle, 10 is a liquid and gas supply pump station, 11 is a mobile platform, 12 is a liquid path connecting hose, 13 is a gas path connecting hose, and 14 is a decomposing furnace.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to FIG. 1, a method for reducing nitrogen oxide emission in a cement kiln includes heating a spray to 850-1050 deg.C in the upper region of a decomposition furnace 14 of a cement predecomposition systemThe nozzle on the gun 8 is placed in the area, the valve bodies on the ammonia water pipeline and the compressed air pipeline are respectively opened, the ammonia water in the ammonia water storage tank 1 placed on the +/-0.00 plane is filtered by the filter 2 and then enters the primary pressure pump 5 arranged on the +/-0.00 plane through the manual stop valve 3 and the flanged spherical plug valve 4, the ammonia water passing through the pressure pump is conveyed to the liquid supply and gas supply pump station 10 on the plane moving platform 11 where the decomposing furnace is located through the check valve 6 and the flanged spherical plug valve 4, and the redundant ammonia water returns to the ammonia water storage tank through the liquid return system. The flow is controlled and regulated by a liquid and gas supply pump station 10, the weight concentration is 20-25%, and the pressure is 0.5-5 kg/cm2The ammonia water is supplied to a spray gun 8 through a connecting hose 12, and compressed air from a compressed air pipe network enters a liquid supply and air supply pump station 10 through a spherical plug valve 4 with a flange to be controlled and regulated, so that the pressure is 0.5-5 kg/cm2Is supplied to the spray gun 8 through a connecting hose 13 and is regulatedAnd the adjusted ammonia water and compressed air are sprayed out of fine atomized liquid drops with the average particle size of 10-20 mu m through a nozzle on a spray gun to the upper area of a cement pre-decomposition system decomposing furnace. In order to avoid the blockage of the nozzle 9, compressed air is kept normally open during normal use, and the spray gun 8 is drawn out of the furnace when not used.
The working principle of the invention is that ammonia is sprayed into a certain temperature area of the decomposing furnace, and NO in the smoke is reduced by the ammoniaxSo that it is converted into N2Thereby reducing the emission of nitrogen oxides.
Controlling equation of ammonia injection denitration:
the optimum temperature window range for ammonia spraying denitration in cement production is as follows: about 850-1050 ℃. At higher temperatures, NH3 is combusted to form NO, for which the formation of NO increases. At low temperatures, the OH groups required for the conversion of NH3 to NH2 are not present in sufficient concentration, and ammonia emissions are increased.
Claims (5)
1. A method for reducing nitrogen oxide emission of a cement kiln is characterized by comprising the following steps: the temperature of the upper part of the decomposing furnace of the cement predecomposition system is 85 DEGA 0-1050 ℃ area, placing a nozzle on a spray gun into the area, respectively opening valve bodies on an ammonia water pipeline and a compressed air pipeline, enabling ammonia water with the weight concentration of 20-25% to flow to a liquid and gas supply pump station from a storage tank through a primary booster pump, enabling compressed air to flow to the liquid and gas supply pump station through the compressed air pipeline, respectively adjusting liquid and gas supply pumps of the ammonia water pipeline and the compressed air pipeline, and controlling the ammonia water supply amount according to NH in a control system3The mol ratio of NO to NO is determined to be 1.3-2.0, the amount of compressed air is automatically adjusted by the ammonia spraying amount, the pressure and the flow are in a linear proportional relation, and the pump station enables the pressure to be 0.5-5 kg/cm2While the pressure is 0.5-5 kg/cm2The compressed air is supplied to a spray gun, and the adjusted ammonia water and the compressed air are sprayed out to form fine atomized liquid drops with the average particle size of 10-20 mu m to the upper area of a cement predecomposition system decomposing furnace through a nozzle on the spray gun.
2. The method of reducing nitrogen oxide emissions from a cement kiln as set forth in claim 1, wherein: the ammonia water filtered by the filter in the ammonia water storage tank flows to the first-stage booster pump through the manual stop valve and the flanged spherical cock valve.
3. The method of reducing nitrogen oxide emissions from a cement kiln as set forth in claim 1, wherein: the ammonia water passing through the pressure pump respectively flows through the one-way valve and the spherical plug valve with the flange through an ammonia water pipeline, the pressure is controlled by a pressure gauge on the spherical plug valve with the flange, the ammonia water flows to the liquid and gas supply pump station, and the redundant ammonia water flows back to the ammonia water storage tank through the spherical plug valve with the flange, the one-way valve and the manual stop valve in the loop.
4. The method of reducing nitrogen oxide emissions from a cement kiln as set forth inclaim 1, wherein: the compressed air comes from a compressed air pipe network, and the pressure is controlled by a pressure gauge on the spherical plug valve with the flange through the spherical plug valve with the flange, so that the compressed air flows to the liquid and air supply pump station.
5. The method of reducing nitrogen oxide emissions from a cement kiln as set forth in claim 1, wherein: the compressed air remains normally open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031299326A CN1186285C (en) | 2003-05-27 | 2003-05-27 | Method for reducing nitrogen oxide exhaust of cement kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031299326A CN1186285C (en) | 2003-05-27 | 2003-05-27 | Method for reducing nitrogen oxide exhaust of cement kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1458102A CN1458102A (en) | 2003-11-26 |
| CN1186285C true CN1186285C (en) | 2005-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031299326A Expired - Lifetime CN1186285C (en) | 2003-05-27 | 2003-05-27 | Method for reducing nitrogen oxide exhaust of cement kiln |
Country Status (1)
| Country | Link |
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| CN (1) | CN1186285C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008039545B3 (en) * | 2008-08-25 | 2010-05-12 | Polysius Ag | Method for firing lumpy material and use of a shaft furnace for carrying out the method |
| CN102650497B (en) * | 2012-05-24 | 2014-12-17 | 中国建筑材料科学研究总院 | Method for reducing emission amount of nitrogen oxides (NOx) in firing zone area of cement rotary kiln and special equipment thereof |
| CN103512373B (en) * | 2012-06-26 | 2015-07-15 | 肖开标 | Energy-saving denitration device and method of cement dry-process kiln |
| CN104548916A (en) * | 2015-01-19 | 2015-04-29 | 郑州大器环境治理有限公司 | Rotary kiln denitration indoor spray gun embedding device and denitration method thereof |
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2003
- 2003-05-27 CN CNB031299326A patent/CN1186285C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1458102A (en) | 2003-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TIANJIN DESIGN INST. OF CEMENT INDUSTRY CO., LTD. Free format text: FORMER OWNER: TIANJIN DESIGN INST. OF CEMENT INDUSTRY Effective date: 20070309 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20070309 Address after: Tianjin District of Beichen city in the 300400 major North Road No. 1 Patentee after: TIANJIN CEMENT INDUSTRY DESIGN & RESEARCH INSTITUTE Co.,Ltd. Address before: Tianjin District of Beichen city in the 300400 major North Road No. 1 Patentee before: TIANJIN CEMENT INDUSTRY DESIGN |
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| CX01 | Expiry of patent term |
Granted publication date: 20050126 |
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| CX01 | Expiry of patent term |