CN112066399A - Nitrogen reduction device and nitrogen reduction process suitable for coke oven - Google Patents
Nitrogen reduction device and nitrogen reduction process suitable for coke oven Download PDFInfo
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- CN112066399A CN112066399A CN202010933741.0A CN202010933741A CN112066399A CN 112066399 A CN112066399 A CN 112066399A CN 202010933741 A CN202010933741 A CN 202010933741A CN 112066399 A CN112066399 A CN 112066399A
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- exhaust gas
- coke oven
- nitrogen
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 43
- 239000000571 coke Substances 0.000 title claims abstract description 38
- 230000009467 reduction Effects 0.000 title claims abstract description 25
- 238000011946 reduction process Methods 0.000 title claims abstract description 11
- 239000002912 waste gas Substances 0.000 claims abstract description 82
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 45
- 238000002485 combustion reaction Methods 0.000 claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 claims abstract description 3
- 239000003034 coal gas Substances 0.000 claims description 8
- 230000001174 ascending effect Effects 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 238000004939 coking Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000006722 reduction reaction Methods 0.000 description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
- F23G7/068—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator using regenerative heat recovery means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/10—Arrangement of sensing devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to the technical field of coking waste gas circulation, in particular to a nitrogen reduction device and a nitrogen reduction process suitable for a coke oven. The device comprises a combustion chamber, a first inclined channel, a second inclined channel, a regenerative chamber, an exhaust plate, an exhaust pipeline and an exhaust gas circulating pipeline; the combustion chamber is connected with the second chute and the regenerator through a first chute, the regenerator is connected with the exhaust gas tray through a pipeline, and the exhaust gas tray is connected with an exhaust gas pipeline; one end of the waste gas circulating pipeline is connected with the waste gas pipeline, the other end of the waste gas circulating pipeline is divided into a first waste gas circulating branch pipe and a second waste gas circulating branch pipe, the first waste gas circulating branch pipe is connected with a first inclined flue, and the second waste gas circulating branch pipe is connected with a second inclined flue. The invention has simple and convenient operation and easy realization, and the content of nitrogen oxide discharged by the coke oven chimney does not exceed 150mg/m3Meets the national standard discharge requirement; meanwhile, the cost of a downstream denitration process is reduced, and the organic unification of nitrogen reduction and cost reduction is realized.
Description
Technical Field
The invention relates to the technical field of coking waste gas circulation, in particular to a nitrogen reduction device and a nitrogen reduction process suitable for a coke oven.
Background
Nitrogen oxides are one of the main pollution sources causing atmospheric pollution, and the emission of the nitrogen oxides brings great harm to human production, life, natural environment and social environment. Along with the coking cleaning technologyIn 2019, five ministries of ecological environment department and the like jointly issue the comments on promoting implementation of ultra-low emission in the steel industry, and the limit value of nitrogen oxides in the coke oven smoke is 150mg/m3. Therefore, with the increase of national environmental protection, the emission control of the coke oven nitrogen oxides is increasingly strict.
The mechanism of formation of nitrogen oxides is mainly classified into 3 types, thermal-thermal type NOXFast NOXAnd nitrogen component-containing fuel type NOXWherein the coke oven waste gas is mainly temperature thermal NOX. The mechanism of formation of thermal nitrogen oxides is that during combustion, nitrogen entrained by the air is oxidized to NOXThere is a direct relationship with temperature.
Aiming at the generation reason of thermal nitrogen oxides, the existing nitrogen reduction technology adopted by the domestic coke oven in the design aspect is mainly two, which are respectively as follows:
(1) an internal circulation hole is arranged in the vertical flame path of the combustion chamber, and waste gas circulation is carried out from the internal circulation hole by virtue of entrainment;
(2) for large volume coke ovens (7m and above), staged combustion technology is also employed.
The two nitrogen reduction methods have low denitration efficiency and are difficult to complete the task of reducing the emission of nitrogen oxides. At present, the Selective Catalytic Reduction (SCR) technology is adopted in part of domestic coke oven denitration, ammonia is used as a reducing agent, and nitrogen oxides are removed under the action of a specific catalyst. Firstly, the ammonia dosage in the catalytic process cannot be accurately controlled, and if the dosage is too high, NH3Can escape along with the flue, has harmful side reaction and causes serious harm to the atmosphere; secondly, the catalyst needs to be replaced regularly, which is expensive and inevitably increases the cost. Therefore, the selective catalytic reduction technology has the disadvantages of huge investment, high operating cost, long response time, time and labor waste and incapability of being popularized and used in a large range.
At the present stage, high-quality coking coal resources are exhausted, the proportion of poor-quality coking coal in blended coal is increased, pollutants generated by coking are increased, the national environmental protection standard is improved continuously, and the requirement of organically unifying nitrogen reduction and cost reduction cannot be met by means of the nitrogen reduction technology.
Disclosure of Invention
In order to overcome the defects of the prior art, the nitrogen reduction device and the nitrogen reduction process suitable for the coke oven are provided, so that the increasingly severe environment-friendly requirement is met, the cost of the downstream denitration process is reduced, and the organic unification of nitrogen reduction and cost reduction is realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a nitrogen reduction device suitable for a coke oven comprises a combustion chamber, a first inclined way, a second inclined way, a regenerative chamber, an exhaust gas tray, an exhaust gas pipeline and an exhaust gas circulating pipeline; the combustion chamber is connected with the second chute and the regenerator through a first chute, the regenerator is connected with the exhaust gas tray through a pipeline, and the exhaust gas tray is connected with an exhaust gas pipeline; one end of the waste gas circulating pipeline is connected with the waste gas pipeline, the other end of the waste gas circulating pipeline is divided into a first waste gas circulating branch pipe and a second waste gas circulating branch pipe, the first waste gas circulating branch pipe is connected with a first inclined flue, and the second waste gas circulating branch pipe is connected with a second inclined flue.
And the first exhaust gas circulation branch pipe and the second exhaust gas circulation branch pipe are respectively provided with a first electric valve and a second electric valve, and the first electric valve and the second electric valve are electrically connected with a first controller.
And a flowmeter is arranged on the waste gas circulating pipeline.
The flowmeter is a mass flowmeter or a volume flowmeter.
The flow meter is digital display or mechanical.
And a variable frequency fan is arranged at one end of the waste gas circulating pipeline connected with the waste gas pipeline.
And the waste gas pipeline is provided with a waste gas monitor.
The variable frequency fan is electrically connected with the waste gas monitor and the second controller.
A nitrogen reduction process suitable for a coke oven specifically comprises the following steps:
1) when the coke oven waste gas flows through the waste gas pipeline through the waste gas disc, the waste gas monitor monitors the flow of the waste gas in real time and transmits data to the second controller;
2) the second controller adjusts the speed of a variable frequency fan connected with the waste gas circulating pipeline according to the monitoring data, and controls the gas flow through a flowmeter connected with the variable frequency fan;
3) when the first inclined channel is an ascending air flow and the second inclined channel is a descending air flow below the combustion chamber, the first controller controls the first electric valve to be opened, the second electric valve is closed, and the waste gas enters the combustion chamber along the first waste gas circulation branch pipe;
4) when the first inclined channel is a descending air flow and the second inclined channel is an ascending air flow under the combustion chamber, the operation is opposite to that of the first inclined channel;
5) under the condition of not influencing the combustion efficiency of the fuel, the circulation volume of the waste gas is 21-30 percent of the total amount of the waste gas, the preheating temperature of air and coal gas is 300-800 ℃, and the final content of nitrogen oxide is not more than 150mg/m3。
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a nitrogen reduction process suitable for the coke oven, overcomes the problem that the existing denitration technology cannot meet the current environmental protection requirement, simultaneously reduces the cost of the downstream denitration technology, and realizes the organic unification of nitrogen reduction and cost reduction. The process is simple and convenient to operate and easy to realize, and the content of nitrogen oxide discharged by the coke oven chimney does not exceed 150mg/m3And meets the national standard discharge requirement.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: 1-first chute 2-first exhaust gas circulation branch pipe 3-first controller 4-first electric valve 5-flowmeter 6-exhaust gas circulation pipeline 7-variable frequency fan 8-second controller 9-exhaust gas monitor 10-exhaust gas pipeline 11-exhaust gas disc 12-regenerator 13-second chute 14-combustion chamber 15-second exhaust gas circulation branch pipe 16-second electric valve
Detailed Description
The invention discloses a nitrogen reduction device and a nitrogen reduction process suitable for a coke oven. Those skilled in the art can modify the process parameters appropriately to achieve the desired results with reference to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
As shown in figure 1, the nitrogen reducing device suitable for the coke oven comprises a combustion chamber 14, a first chute 1, a second chute 13, a regenerator 12, an exhaust tray 11, an exhaust pipeline 10 and an exhaust gas circulating pipeline 6. The combustion chamber 14 is connected with the second chute 13 and the regenerator 12 through the first chute 1, the regenerator 12 is connected with the exhaust gas tray 11 through a pipeline, and the exhaust gas tray 11 is connected with the exhaust gas pipeline 10.
One end of the waste gas circulating pipeline 6 is connected with the waste gas pipeline 10, the other end of the waste gas circulating pipeline is divided into a first waste gas circulating branch pipe 2 and a second waste gas circulating branch pipe 15, the first waste gas circulating branch pipe 2 is connected with a first inclined flue 1, and the second waste gas circulating branch pipe 15 is connected with a second inclined flue 13.
The first exhaust gas circulation branch pipe 2 and the second exhaust gas circulation branch pipe 15 are respectively provided with a first electric valve 4 and a second electric valve 16, and the first electric valve 4 and the second electric valve 16 are electrically connected with the first controller 3.
A flowmeter 5 is arranged on the exhaust gas circulating pipeline 6. The flow meter 5 is a mass flow meter or a volume flow meter. The flow meter 5 is digital or mechanical.
And a variable frequency fan 7 is arranged at one end of the waste gas circulating pipeline 6 connected with the waste gas pipeline 10. An exhaust gas monitor 9 is arranged on the exhaust gas pipeline 10. The variable frequency fan 7 and the waste gas monitor 9 are electrically connected with the second controller.
A nitrogen reduction process suitable for a coke oven specifically comprises the following steps:
1) when the coke oven waste gas flows through the waste gas pipeline 10 through the waste gas disk 11, the waste gas monitor 9 monitors the flow rate of the waste gas in real time and transmits the data to the second controller 8;
2) the second controller 8 adjusts the speed of the variable frequency fan 7 connected with the waste gas circulating pipeline 10 according to the monitoring data, and controls the gas flow through the flowmeter 5 connected with the variable frequency fan 7;
3) when the first inclined channel 1 is an ascending air flow and the second inclined channel 13 is a descending air flow below the combustion chamber, the first controller 3 controls the first electric valve 4 to be opened, the second electric valve 16 to be closed, and the waste gas enters the combustion chamber 14 along the first waste gas circulating branch pipe 2;
4) when the first inclined channel 1 is a descending air flow and the second inclined channel 13 is an ascending air flow under the combustion chamber, the operation is opposite to the operation;
5) under the condition of not influencing the combustion efficiency of the fuel, the circulation volume of the waste gas is 21-30 percent of the total amount of the waste gas, the preheating temperature of air and coal gas is 300-800 ℃, and the final content of nitrogen oxide is not more than 150mg/m3。
Example 1
When the nitrogen reduction device is adopted in a coke oven with the size of 6m, the preheating temperature of air and coal gas is 600 ℃, the circulating amount of waste gas is 21 percent of the total amount of the waste gas, and the average content of discharged nitrogen oxides is 142mg/m3。
Example 2
When the 6m coke oven adopts the nitrogen reducing device, the preheating temperature of air and coal gas is 400 ℃, the circulating amount of waste gas is 23 percent of the total amount of the waste gas, and the average content of the discharged nitrogen oxides is 119mg/m when the gas direction is reversed3。
Example 3
When the coke oven with the size of 7m adopts the nitrogen reducing device, the preheating temperature of air and coal gas is 500 ℃, the circulating amount of waste gas is 22 percent of the total amount of the waste gas, and the average content of the discharged nitrogen oxides is 128mg/m3。
Example 4
When the coke oven with the size of 7m adopts the nitrogen reducing device, the preheating temperature of air and coal gas is 450 ℃, the circulating amount of waste gas is 25 percent of the total amount of the waste gas, and the average content of nitrogen oxide discharged when the gas direction is reversed is 102mg/m3。
Example 5
When the coke oven with the size of 7m adopts the nitrogen reducing device, the preheating temperature of air and coal gas is 400 ℃, the circulation of waste gas is 30 percent of the total amount of the waste gas, and the average content of the discharged nitrogen oxides is 85mg/m3。
The invention adopts a nitrogen reduction process suitable for the coke oven, overcomes the problem that the existing denitration technology cannot meet the current environmental protection requirement, simultaneously reduces the cost of the downstream denitration technology, and realizes the organic unification of nitrogen reduction and cost reduction. The toolThe process is simple and convenient to operate and easy to realize, and the content of nitrogen oxide discharged by the coke oven chimney does not exceed 150mg/m3And meets the national standard discharge requirement.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The nitrogen reduction device suitable for the coke oven is characterized by comprising a combustion chamber, a first inclined channel, a second inclined channel, a regenerative chamber, an exhaust gas disc, an exhaust gas pipeline and an exhaust gas circulating pipeline; the combustion chamber is connected with the second chute and the regenerator through a first chute, the regenerator is connected with the exhaust gas tray through a pipeline, and the exhaust gas tray is connected with an exhaust gas pipeline; one end of the waste gas circulating pipeline is connected with the waste gas pipeline, the other end of the waste gas circulating pipeline is divided into a first waste gas circulating branch pipe and a second waste gas circulating branch pipe, the first waste gas circulating branch pipe is connected with a first inclined flue, and the second waste gas circulating branch pipe is connected with a second inclined flue.
2. The nitrogen reducing device for the coke oven as claimed in claim 1, wherein the first exhaust gas circulation branch pipe and the second exhaust gas circulation branch pipe are respectively provided with a first electric valve and a second electric valve, and the first electric valve and the second electric valve are electrically connected with the first controller.
3. The nitrogen reducing device for the coke oven as claimed in claim 1, wherein a flow meter is arranged on the exhaust gas circulation pipeline.
4. The nitrogen reducing device for the coke oven as claimed in claim 3, wherein the flow meter is a mass flow meter or a volume flow meter.
5. The nitrogen reduction device for the coke oven according to claim 3, wherein the flow meter is digital or mechanical.
6. The nitrogen reducing device for the coke oven as claimed in claim 1, wherein the end of the exhaust gas circulation pipeline connected with the exhaust gas pipeline is provided with a variable frequency fan.
7. The nitrogen reduction device for the coke oven as claimed in claim 1, wherein the exhaust gas pipeline is provided with an exhaust gas monitor.
8. The nitrogen reducing device for the coke oven as claimed in claim 6 or 7, wherein the variable frequency fan and the waste gas monitor are electrically connected with the second controller.
9. A nitrogen reduction process based on the nitrogen reduction device suitable for the coke oven of claim 1, 2, 3, 4, 5, 6, 7 or 8 is characterized by comprising the following steps:
1) when the coke oven waste gas flows through the waste gas pipeline through the waste gas disc, the waste gas monitor monitors the flow of the waste gas in real time and transmits data to the second controller;
2) the second controller adjusts the speed of a variable frequency fan connected with the waste gas circulating pipeline according to the monitoring data, and controls the gas flow through a flowmeter connected with the variable frequency fan;
3) when the first inclined channel is an ascending air flow and the second inclined channel is a descending air flow below the combustion chamber, the first controller controls the first electric valve to be opened, the second electric valve is closed, and the waste gas enters the combustion chamber along the first waste gas circulation branch pipe;
4) when the first inclined channel is a descending air flow and the second inclined channel is an ascending air flow under the combustion chamber, the operation is opposite to that of the first inclined channel;
5) under the condition of not influencing the combustion efficiency of the fuel, the circulation volume of the waste gas is 21-30 percent of the total amount of the waste gas, the preheating temperature of air and coal gas is 300-800 ℃, and the final content of nitrogen oxide is not more than 150mg/m3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010933741.0A CN112066399A (en) | 2020-09-08 | 2020-09-08 | Nitrogen reduction device and nitrogen reduction process suitable for coke oven |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010933741.0A CN112066399A (en) | 2020-09-08 | 2020-09-08 | Nitrogen reduction device and nitrogen reduction process suitable for coke oven |
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| CN112066399A true CN112066399A (en) | 2020-12-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103834416A (en) * | 2014-03-18 | 2014-06-04 | 辽宁科技大学工程技术有限公司 | Large-sized tamping coke oven |
| CN105885877A (en) * | 2016-05-23 | 2016-08-24 | 中冶焦耐工程技术有限公司 | Method and system for reducing nitric oxide in coke-oven exhaust gas |
| CN205874296U (en) * | 2016-07-21 | 2017-01-11 | 中冶焦耐(大连)工程技术有限公司 | Can reduce coke oven exhaust gas circulation device of nitrogen oxide concentration in waste gas |
| CN106885876A (en) * | 2015-12-16 | 2017-06-23 | 鞍钢股份有限公司 | System and method for detecting oxygen content and nitrogen oxide concentration of coke oven flue gas |
| CN110938447A (en) * | 2019-12-27 | 2020-03-31 | 中冶焦耐(大连)工程技术有限公司 | Novel coke oven structure and sectional heating combustion method thereof |
| CN111171846A (en) * | 2019-12-27 | 2020-05-19 | 中冶焦耐(大连)工程技术有限公司 | Novel coke oven chute structure |
-
2020
- 2020-09-08 CN CN202010933741.0A patent/CN112066399A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103834416A (en) * | 2014-03-18 | 2014-06-04 | 辽宁科技大学工程技术有限公司 | Large-sized tamping coke oven |
| CN106885876A (en) * | 2015-12-16 | 2017-06-23 | 鞍钢股份有限公司 | System and method for detecting oxygen content and nitrogen oxide concentration of coke oven flue gas |
| CN105885877A (en) * | 2016-05-23 | 2016-08-24 | 中冶焦耐工程技术有限公司 | Method and system for reducing nitric oxide in coke-oven exhaust gas |
| CN205874296U (en) * | 2016-07-21 | 2017-01-11 | 中冶焦耐(大连)工程技术有限公司 | Can reduce coke oven exhaust gas circulation device of nitrogen oxide concentration in waste gas |
| CN110938447A (en) * | 2019-12-27 | 2020-03-31 | 中冶焦耐(大连)工程技术有限公司 | Novel coke oven structure and sectional heating combustion method thereof |
| CN111171846A (en) * | 2019-12-27 | 2020-05-19 | 中冶焦耐(大连)工程技术有限公司 | Novel coke oven chute structure |
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