CN210340762U - Coke oven flue gas back distribution system - Google Patents
Coke oven flue gas back distribution system Download PDFInfo
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- CN210340762U CN210340762U CN201920904313.8U CN201920904313U CN210340762U CN 210340762 U CN210340762 U CN 210340762U CN 201920904313 U CN201920904313 U CN 201920904313U CN 210340762 U CN210340762 U CN 210340762U
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Abstract
The utility model relates to a coke oven flue gas return system, which comprises a waste gas return unit consisting of a return main pipe, a red return main pipe, a green return main pipe, a return branch pipe, a small flue connecting pipe and a flue gas return fan; the top of the coke oven converging flue is provided with an air intake port connected with a return main pipe, the return main pipe is provided with a fan inlet regulating valve, a flue gas return fan, a fan outlet regulating valve and a flowmeter, the return main pipe is branched into a red return main pipe and a green return main pipe, the red return main pipe is provided with a red electric butterfly valve, and the green return main pipe is provided with a green electric butterfly valve; the red return main pipe and the green return main pipe are respectively connected with the corresponding small flues of the coke oven through the return branch pipes and the small flue connecting pipes; the red electric butterfly valve and the green electric butterfly valve are respectively interlocked with a waste gas oil cylinder in the coke oven exchange system for control. The system structure is simple, the safety is high, the whole investment of the equipment is low, and the operation and the maintenance operation of other equipment and pipelines in the coke oven production are convenient.
Description
Technical Field
The utility model relates to a flue gas blending technical field among the coke oven heating system especially relates to a coke oven flue gas blending system.
Background
At present, the requirement of environmental protection laws and regulations on the concentration of nitrogen oxide emission in the coking production process is increasingly strict, and the adoption of a waste gas circulation method for reducing the concentration of nitrogen oxide in the coke oven waste gas from the source is simpler, more convenient and more economic than the post-treatment nitrogen reduction means of desulfurization and denitrification, so that the waste gas circulation method for reducing the nitrogen oxide is widely adopted by more and more coking plants.
The waste gas circulation method reduces the concentration of nitrogen oxides in the coke oven waste gas, namely, the waste gas in a flue of the coke oven is extracted and mixed into the rising air heated by the coke oven, the oxygen content in the vertical flue is diluted, the combustion reaction intensity is reduced, the combustion temperature is reduced, and the intensity of side reactions for generating the nitrogen oxides in a high-temperature region is reduced, so that the generation of the nitrogen oxides in the vertical flue is reduced, and the aim of reducing the nitrogen oxides in the waste gas discharged from the coke oven from the source is fulfilled.
The device that exhaust gas circulation adopted simple structure, small investment, occupation of land are little, the regulation is convenient and the nitrogen reduction effect is obvious, but the process units in present design, transformation, operation have following problem:
1. the lack of overall planning and layout of a waste gas back-distribution process system in a coke oven regional building with limited space leads to the fact that the process arrangement of equipment, pipelines and the like is not concise and reasonable; the operation and maintenance of waste gas return system equipment and pipelines are not considered; the maintenance, overhaul and operation space of other process equipment and pipelines are not considered.
2. The waste gas return system is designed, built and put into use at present, and is mostly connected with the coke oven body by a hole on a waste gas shutter or a small flue connecting pipe to connect a return branch pipe; or the return branch pipe directly occupies a mixed gas inlet reserved by the shutter and an ash removal port of a small flue connecting pipe and the like, and other equipment interfaces are technically set for other purposes.
3. The reversing matching relation of some waste gas back-distribution systems and the coke oven heating system is realized by the coke oven exchange transmission device, so that the load and the potential safety hazard of the exchange transmission device are increased, and the waste gas back-distribution system is complicated in equipment and structure, increased in cost and increased in potential safety hazard points.
SUMMERY OF THE UTILITY MODEL
The utility model provides a coke oven flue gas blending system draws the flue gas from joining the flue department, through arranging the flue gas at joining the flue top and blending fan pressurization, makes the flue gas of blending back get into in the coke oven furnace body through blending back the main pipe in proper order, blending back branch pipe, little flue connecting pipe and little flue, reduces the oxygen content in the updraft, and then reduces the combustion reaction intensity, reduces the formation of nitrogen oxide secondary reaction from the source, reaches the purpose of source nitrogen reduction; the system has simple structure, high safety and low overall equipment investment, and is convenient for the operation and maintenance of other equipment and pipelines in the production of the coke oven.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coke oven flue gas back-distribution system comprises waste gas back-distribution units which are respectively arranged in underground chambers at two sides of a coke oven machine and coke; the waste gas return distribution unit consists of a return main pipe, a red return main pipe, a green return main pipe, return branch pipes, small flue connecting pipes and a flue gas return fan; the top of the coke oven converging flue is provided with an air intake connected with a return main pipe, the return main pipe is sequentially provided with a fan inlet regulating valve, a flue gas return fan, a fan outlet regulating valve and a flowmeter along the flow direction of flue gas, the flue gas return fan is arranged at the top of the converging flue, the return main pipe is divided into a red return main pipe and a green return main pipe at a counter resistance wall, the red return main pipe is provided with a red electric butterfly valve at one end close to the return main pipe, and the green return main pipe is provided with a green electric butterfly valve at one end close to the return main pipe; the red and green main back-distribution pipes are longitudinally arranged in the area between the side wall of the flue and the side column along the coke oven, the red and green main back-distribution pipes are respectively connected with the waste gas back-distribution interfaces at the bottoms of the small flue connecting pipes corresponding to the small flues of the coke ovens through a plurality of back-distribution branch pipes, one end of each small flue connecting pipe is connected with a waste gas shutter, and the other end of each small flue connecting pipe is connected with a connecting port brick air passage corresponding to the small flue of the coke oven; the red electric butterfly valve and the green electric butterfly valve are respectively interlocked with a waste gas oil cylinder in the coke oven exchange system for control.
The flue gas return fan is a variable frequency fan.
The red main distribution pipe and the green main distribution pipe are respectively provided with a plurality of compensators and pipeline supports, and the compensators and the pipeline supports are arranged at intervals and are longitudinally and uniformly arranged along the red main distribution pipe and the green main distribution pipe.
And a butterfly valve is arranged on the return branch pipe.
And a section of metal hose is arranged on the return branch pipe.
And the outer sides of the main return pipe, the red main return pipe, the green main return pipe and the branch return pipe are respectively provided with a heat insulation layer.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the space between the side wall of the flue and the side column of the underground chamber is fully utilized to arrange a pipeline system of the waste gas return-distribution unit, the space does not belong to a main operation space in the production, operation and maintenance processes of the coke oven, the flue gas return-distribution fan is arranged at the top of the converging flue, the whole process route is shortest, the overhaul and operation spaces of equipment such as the flue gas return-distribution fan and the like are considered, and the operation spaces and overhaul channels of other facilities of the coke oven are also considered, so that the whole process layout of the coke oven flue gas return-distribution system is more reasonable and simpler;
2) the red electric butterfly valve, the green electric butterfly valve and the waste gas oil cylinder which are controlled to be opened and closed correspondingly to the red return main pipe and the green return main pipe are controlled to be interlocked, so that waste gas is ensured to reenter the furnace after the exchange process of coke oven gas is finished, and the potential local deflagration phenomenon is avoided; the flue gas recirculation system of the utility model is provided with a red recirculation main pipe, a green recirculation main pipe, a red electric butterfly valve and a green electric butterfly valve which correspond to the red and green heating modes of the coke oven heating system, thus being easy to operate and avoiding safety accidents caused by confusion; the red and green distribution main pipes are provided with compensators and pipeline brackets, so as to prevent production accidents caused by thermal stress in a high-temperature running state, thereby ensuring the safety of the flue gas distribution system;
3) the waste gas of returning to join in marriage branch pipe and little flue connecting pipe bottom returns to join in marriage the interface connection, returns to join in marriage and sets up the butterfly valve on the branch pipe, makes things convenient for each branch pipe department to return to join in marriage the regulation and the system maintenance of flue gas flow, under the nervous condition of time limit for a project, also can debug in advance, put into operation coke oven main process system, then drop into again the flue gas system of returning to join in marriage.
4) The flue gas return fan is arranged in the explosion-proof area II, so that the explosion-proof grade of related electrical equipment can be reduced, and the corresponding equipment investment cost is reduced; the red electric butterfly valve and the green electric butterfly valve take the inherent waste gas oil cylinder exchange end signal of the coke oven as an action signal, the action is reliable, and the process system is more economical to arrange.
Drawings
FIG. 1 is a schematic structural diagram of a coke oven flue gas recycling system according to the present invention.
FIG. 2 is a schematic view of the connection relationship between the flue gas distribution fan, the distribution main pipe, the red distribution main pipe and the green distribution main pipe.
Fig. 3 is a schematic view of the connection relationship between the red back-distribution main pipe, the green back-distribution main pipe, the small flue connecting pipe, the small flue and the waste gas shutter.
In the figure: 1. converging flue gas taking port 2, fan inlet regulating valve 3, flue gas return fan 4, fan outlet regulating valve 5, flow meter 6, red electric butterfly valve 7, green electric butterfly valve 8, waste gas shutter 9, compensator 10, red return main pipe 11, green return main pipe 12, butterfly valve 13, metal hose 14, return branch pipe 15, small flue connecting pipe 16, waste gas oil cylinder 17, connecting port brick air flue of coke oven small flue
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1-3, the coke oven flue gas recycling system of the present invention comprises a waste gas recycling unit respectively disposed in the underground chambers at the two sides of the coke oven machine and the coke oven; the waste gas return distribution unit consists of a return main pipe, a red return main pipe 10, a green return main pipe 11, a return branch pipe 14, a small flue connecting pipe 15 and a flue gas return fan 3; the top of a coke oven converging flue is provided with an air intake 1 connected with a return main pipe, the return main pipe is sequentially provided with a fan inlet regulating valve 2, a flue gas return fan 3, a fan outlet regulating valve 4 and a flow meter 5 along the flow direction of flue gas, the flue gas return fan 3 is arranged at the top of the converging flue, the return main pipe is divided into a red return main pipe 10 and a green return main pipe 11 at a counter resisting wall, the red return main pipe 10 is provided with a red electric butterfly valve 6 at one end close to the return main pipe, and the green return main pipe 11 is provided with a green electric butterfly valve 7 at one end close to the return main pipe; the red and green main return distribution pipes 10 and 11 are longitudinally arranged in the area between the side wall of the flue and the side column of the coke oven, the red and green main return distribution pipes 10 and 11 are respectively connected with the waste gas return distribution interface at the bottom of a small flue connecting pipe 15 arranged corresponding to each small flue of the coke oven through a plurality of return distribution branch pipes 14, one end of the small flue connecting pipe 15 is connected with a waste gas shutter 8, and the other end of the small flue connecting pipe 15 is connected with a connecting port brick air passage 17 corresponding to the small flue of the coke oven; the red electric butterfly valve 6 and the green electric butterfly valve 7 are respectively interlocked with a waste gas oil cylinder 16 in the coke oven exchange system for control.
The flue gas return fan 3 is a variable frequency fan.
The red main distribution pipe 10 and the green main distribution pipe 11 are respectively provided with a plurality of compensators 9 and pipeline supports, the compensators 9 and the pipeline supports are arranged at intervals and are longitudinally and uniformly arranged along the red main distribution pipe 10 and the green main distribution pipe 11.
The return branch pipe 14 is provided with a butterfly valve 12.
The return branch pipe 14 is provided with a section of metal hose 13.
And heat insulation layers are respectively arranged on the outer sides of the main return pipe, the red main return pipe 10, the green main return pipe 11 and the branch return pipes 14.
In the coke oven flue gas return system of the utility model, a flue gas return fan 3 takes out the coke oven flue gas from a gas taking port 1 arranged at the top of a converging flue, and the flue gas is adjusted by a fan inlet adjusting valve 2 and a fan outlet adjusting valve 4 along a return main pipe, and a flow meter 5 measures the flue gas and sends the flue gas into a pipeline system positioned in a basement; the return main pipe is branched into 2 paths at the position of the counter wall, one path is a red return main pipe 10, the other path is a green return main pipe 11, a red electric butterfly valve 6 is arranged on the red return main pipe 10, a green electric butterfly valve 7 is arranged on the green return main pipe 11, the red electric butterfly valve 6 and the green electric butterfly valve 7 are respectively interlocked and controlled with an exhaust gas cylinder 16 in the coke oven exchange system, after a reversing action ending signal of the exhaust gas cylinder 16 is received, the red electric butterfly valve 6 and the green electric butterfly valve 7 respectively act, one valve is turned on from off so as to be communicated with the return main pipe and the flue gas return fan 3, the other valve is turned off from on so as to be disconnected with the return main pipe and the flue gas return fan 3, the opening and closing states of the 2 valves correspond to the coke oven heat exchange state, namely, the valve on the return main pipe corresponding to the small flue of the coke oven in the ascending air flow state is in, the valve on the return main pipe corresponding to the small flue of the coke oven in the downdraft state is in a closed state;
the returned flue gas enters the small flue through a waste gas returning interface arranged at the bottom of the small flue connecting pipe 15 through a returning branch pipe 14 to deplete oxygen in the ascending gas flow, reduce the intensity of combustion reaction in the combustion chamber of the coke oven and reduce the generation amount of nitrogen oxides, a butterfly valve 12 is arranged on the returning branch pipe 14 to meet the requirement of single-hole adjustment along the longitudinal direction of the coke oven, and a metal hose 13 is also arranged on the returning branch pipe 14 to facilitate installation and adjustment and ensure the safe operation of a process system under a thermal state working condition.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A coke oven flue gas back-distribution system comprises waste gas back-distribution units which are respectively arranged in underground chambers at two sides of a coke oven machine and coke; the waste gas return distribution unit is characterized by consisting of a return distribution main pipe, a red return distribution main pipe, a green return distribution main pipe, a return distribution branch pipe, a small flue connecting pipe and a flue gas return distribution fan; the top of the coke oven converging flue is provided with an air intake connected with a return main pipe, the return main pipe is sequentially provided with a fan inlet regulating valve, a flue gas return fan, a fan outlet regulating valve and a flowmeter along the flow direction of flue gas, the flue gas return fan is arranged at the top of the converging flue, the return main pipe is divided into a red return main pipe and a green return main pipe at a counter resistance wall, the red return main pipe is provided with a red electric butterfly valve at one end close to the return main pipe, and the green return main pipe is provided with a green electric butterfly valve at one end close to the return main pipe; the red and green main back-distribution pipes are longitudinally arranged in the area between the side wall of the flue and the side column along the coke oven, the red and green main back-distribution pipes are respectively connected with the waste gas back-distribution interfaces at the bottoms of the small flue connecting pipes corresponding to the small flues of the coke ovens through a plurality of back-distribution branch pipes, one end of each small flue connecting pipe is connected with a waste gas shutter, and the other end of each small flue connecting pipe is connected with a connecting port brick air passage corresponding to the small flue of the coke oven; the red electric butterfly valve and the green electric butterfly valve are respectively interlocked with a waste gas oil cylinder in the coke oven exchange system for control.
2. The coke oven flue gas recirculation system of claim 1, wherein the flue gas recirculation fan is a variable frequency fan.
3. The coke oven flue gas distribution system of claim 1, wherein the red distribution main pipe and the green distribution main pipe are respectively provided with a plurality of compensators and pipe brackets, and the compensators and the pipe brackets are arranged at intervals and are uniformly arranged along the longitudinal direction of the red distribution main pipe and the green distribution main pipe.
4. The coke oven flue gas recirculation system of claim 1, wherein the recirculation branch is provided with a butterfly valve.
5. The coke oven flue gas recirculation system of claim 1, wherein a length of metal hose is provided on the recirculation branch.
6. The coke oven flue gas distribution system of claim 1, wherein the outsides of the main distribution pipe, the red main distribution pipe, the green main distribution pipe and the branch distribution pipes are respectively provided with a heat insulation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920904313.8U CN210340762U (en) | 2019-06-17 | 2019-06-17 | Coke oven flue gas back distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920904313.8U CN210340762U (en) | 2019-06-17 | 2019-06-17 | Coke oven flue gas back distribution system |
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| Publication Number | Publication Date |
|---|---|
| CN210340762U true CN210340762U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920904313.8U Active CN210340762U (en) | 2019-06-17 | 2019-06-17 | Coke oven flue gas back distribution system |
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| CN (1) | CN210340762U (en) |
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2019
- 2019-06-17 CN CN201920904313.8U patent/CN210340762U/en active Active
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