CN211595509U - Coke oven flue gas blending process unit - Google Patents
Coke oven flue gas blending process unit Download PDFInfo
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- CN211595509U CN211595509U CN201922374933.8U CN201922374933U CN211595509U CN 211595509 U CN211595509 U CN 211595509U CN 201922374933 U CN201922374933 U CN 201922374933U CN 211595509 U CN211595509 U CN 211595509U
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Abstract
The utility model relates to a coke oven flue gas blending process units, including fan entry governing valve, fan export governing valve, flowmeter, switching-over system, compensator, blending person in charge, flue gas governing valve, switching-over valve, metal collapsible tube, blending branch pipe and waste gas blending little flue connecting pipe. The beneficial effects are as follows: the utility model does not use a coke oven exchange transmission device, adopts a reversing system to lead out flue gas from a converging flue, and enters the coke oven body through a main return pipe, a branch return pipe and a small flue for waste gas return by pressurization of a fan, and the switching is convenient and reliable; the space between the side wall of the flue and the side column of the underground chamber is fully utilized to arrange the return pipeline system, the process arrangement is simple, reasonable, safe and reliable, the equipment investment is reduced, 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 coke oven heating flue gas blending technology in the technical field of coking, in particular to a coke oven flue gas blending process device.
Background
With the enhancement of environmental awareness of people, the requirements of national environmental regulations on the emission of nitrogen oxides in the coking production process are increasingly strict. The method for reducing the concentration of the nitrogen oxides in the coke oven waste gas by adopting the waste gas circulation method is simpler, more convenient and more economical than the method for reducing the nitrogen by adopting the desulfurization, the denitrification and the nitrogen reduction. Therefore, the waste gas recycling process for reducing nitrogen oxides has been widely adopted by more and more coke plants.
The process for reducing the concentration of nitrogen oxides in the waste gas of the coke oven by a waste gas circulation method is to extract the waste gas of a flue of the coke oven to be mixed into the rising air heated by the coke oven, dilute the oxygen content in a vertical flue, reduce the combustion reaction intensity, reduce the combustion temperature and reduce the intensity of side reactions of nitrogen oxides generated in a high-temperature region so as to reduce the generation of the nitrogen oxides in the vertical flue and achieve the purpose of reducing the nitrogen oxides in the waste gas discharged from the coke oven from the source.
The device adopted by the waste gas circulation process has the advantages of simple structure, less investment, small occupied area, convenient adjustment and obvious nitrogen reduction effect. The existing design, waste gas back-distribution system under construction and put into use at present has the following problems:
1) the operation and the overhaul of equipment and pipelines in the waste gas back-distribution system are not considered, the maintenance, the overhaul and the operation space of other process equipment and pipelines are not considered, the overall planning layout of the waste gas back-distribution process system in the construction of the coke oven area with limited space is lacked, and the process arrangement of the equipment, the pipelines and the like is not concise and reasonable;
2) the connection with the coke oven body is that a hole is opened 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 a small flue connecting pipe ash cleaning port and is technically set as a special equipment interface for other purposes, and special equipment for connecting a waste gas return system with the coke oven body is lacked, so that the waste gas return system can be conveniently and safely cut off from the coke oven body when being opened, stopped and overhauled;
3) the reversing matching relationship between some waste gas back-distribution systems and the coke oven heating systems is realized by the coke oven exchange transmission device, so that the load and potential safety hazards of the exchange transmission device are increased, and the waste gas back-distribution systems are complicated in equipment structure, increased in cost and increased in potential safety hazard points.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the technical problem solved by the utility model is to provide a coke oven flue gas blending process device, a coke oven exchange transmission device is not used, a reversing system is adopted to lead the flue gas out from a converging flue, and the flue gas is pressurized by a fan and enters the coke oven body through a blending main pipe, a blending branch pipe and a small flue for waste gas blending, so that the switching is convenient and reliable; the space between the side wall of the flue and the side column of the underground chamber is fully utilized to arrange the return pipeline system, the process arrangement is simple, reasonable, safe and reliable, the equipment investment is reduced, and the operation and the maintenance operation of other equipment and pipelines in the coke oven production are convenient.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coke oven flue gas recollection process unit comprises a fan inlet regulating valve, a fan outlet regulating valve, a flowmeter, a reversing system, a compensator, a recollection main pipe, a flue gas regulating valve, a reversing valve, a metal hose, a recollection branch pipe and a waste gas recollection small flue connecting pipe, and is characterized in that the fan inlet is connected with a confluence flue gas intake port through the fan inlet regulating valve, and the outlet is connected with the recollection main pipe through the fan outlet regulating valve; the main return pipe is longitudinally arranged in an area between the side wall of the flue of the basement of the coke oven and the side column; the flowmeter is arranged in the return main pipe close to the end of the fan; the compensators are uniformly arranged on each section of the return main pipe; one end of the return branch pipe is connected with the return main pipe through a metal hose, a reversing valve and a flue gas regulating valve, and the other end of the return branch pipe is connected with a small flue connecting pipe for waste gas return; the reversing system is connected with the reversing valve.
The reversing system is interlocked with a waste gas oil cylinder in the exchange transmission device.
The main return pipe is composed of a plurality of sections of reducing pipes and is subjected to multistage reducing along the longitudinal direction of the coke oven.
The fan is arranged on the top surface of the converging flue.
And the return main pipe and the return branch pipe are respectively provided with a heat insulation layer.
And fixed connection points are arranged at the two ends of the return main pipe connected with the compensator.
The waste gas recycling is connected with the small flue through a small flue connecting pipe through a flange.
Compared with the prior art, the beneficial effects of the utility model are that:
1) a return pipe system is arranged by fully utilizing the space between the side wall of the flue and the side column of the basement, and the space does not belong to a main operation space in the production, operation and maintenance processes of the coke oven; the fan is arranged on the top surface of the converging flue, so that the whole process route is shortest, the overhaul and operation space of equipment such as the fan and the like is considered, and the operation space and overhaul channel of other facilities of the coke oven are considered, and the whole arrangement of the waste gas back-distribution process system is more reasonable and concise;
2) the main pipe is reduced in section, uniform air inlet of each return branch pipe is guaranteed, and the condition that the air inlet of the return branch pipes is short-circuited at the position close to the fan is avoided;
3) the recycling branch pipe is connected with the small flue for recycling waste gas by a flange, so that the tightness of a pipeline system is ensured; the reversing system of the return branch pipe is interlocked with the waste gas oil cylinder, so that waste gas is ensured to enter the coke oven after the gas exchange process is finished, and the potential local deflagration phenomenon is avoided; the waste gas back-distribution system corresponds to the coke oven heating mode, so that safety accidents are avoided; the arrangement of the compensator (expansion joint) and the fixed point on the return main pipe prevents production accidents caused by thermal stress in a high-temperature running state, and the measures ensure the safety of the flue gas return system;
4) the return branch pipe is connected with the small flue for waste gas return by adopting a flange, and the reversing system is arranged independently of the coke oven exchange transmission device, so that the system is convenient to overhaul, and the return system is convenient to delay the main process debugging and put into operation of the coke oven under the condition of short construction period.
Drawings
FIG. 1 is a schematic front view of the process arrangement principle of the present invention;
FIG. 2 is a schematic top view of the process arrangement principle of the present invention;
fig. 3 is a schematic cross-sectional view of the process arrangement principle of the present invention.
In the figure: 1-converging flue gas taking port 2-fan inlet regulating valve 3-fan 4-fan outlet regulating valve 5-flowmeter 6-reversing system 8-compensator 9-return main pipe 10-flue gas regulating valve 11-reversing valve 12-metal hose 13-return branch pipe 14-small flue gas return connecting pipe 15-waste gas oil cylinder in exchange transmission device
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 utility model relates to a coke oven flue gas blending process device, which comprises a fan inlet regulating valve 2, a fan 3, a fan outlet regulating valve 4, a flowmeter 5, a reversing system 6, a waste gas shutter 7, a compensator 8, a blending main pipe 9, a flue gas regulating valve 10, a reversing valve 11, a metal hose 12, a blending branch pipe 13 and a waste gas blending small flue connecting pipe 14, wherein the fan 3 inlet is connected with a converging flue gas intake port 1 through the fan inlet regulating valve 2, and the outlet is connected with the blending main pipe 9 through the fan outlet regulating valve 4; the main return pipe 9 consists of a plurality of sections of reducing pipes, is longitudinally arranged in the area between the side wall of the flue of the basement of the coke oven and the side column along the coke oven, belongs to a non-main operation space, and does not influence the arrangement of other process pipelines, equipment setting, operation control and the like; the flowmeter 5 is arranged in a return main pipe 9 close to the fan 3; the compensators 8 are uniformly arranged on each section of the return main pipe 9; one end of the return branch pipe 13 is connected with the return main pipe 9 through a metal hose 12, a reversing valve 11 and a flue gas regulating valve 10, and the other end of the return branch pipe is connected with a small flue flange 14 for waste gas return; the reversing system 6 is connected with the reversing valve 11 through a reversing valve carrying rod to realize the communication or the disconnection of the return branch pipe 13, namely, the waste gas is determined to be introduced into the coke oven or not.
The reversing system 6 is interlocked with a waste gas oil cylinder 14 in the exchange transmission device.
The main return pipe 9 is composed of a plurality of sections of reducing pipes, and is designed in a multi-stage reducing mode along the longitudinal direction of the coke oven, the reducing can ensure that each return branch pipe 13 uniformly admits air, and the condition that the inlet air of the return branch pipe 13 close to the fan 3 is short-circuited is avoided.
The fan 3 is arranged on the top surface of the converging flue.
And heat insulation layers are arranged on the main return pipe 9 and the branch return pipes 13.
And fixed connection points are arranged at two ends of the return main pipe 9 connected with the compensator 8.
The waste gas recycling is connected with the small flue through a flange by a small flue connecting pipe 14, and the waste gas is recycled to the coke oven through the small flue.
When in work:
1) the fan 3 extracts flue waste gas from a converging flue gas inlet 1 arranged at the top of the converging flue, and the flue waste gas is adjusted and sent into a return main pipe 9 positioned in the basement through a fan inlet adjusting valve 2 and a fan outlet adjusting valve 4; the flow meter 5 is arranged on the main return distribution pipe 9 and used for metering the amount of the flue gas to be returned, the main return distribution pipe 9 is provided with variable diameters in sections, the compensators 8 are uniformly arranged at certain intervals, and fixed points are arranged at proper positions along the longitudinal direction of the coke oven, so that production accidents caused by thermal stress in a high-temperature operation state are prevented, and the safety of a flue gas return distribution system is ensured;
2) the reversing system 6 arranged on the return branch pipe 13 is interlocked with a waste gas oil cylinder 15 in the exchange transmission device, and after a reversing action ending signal of the waste gas oil cylinder is received, the reversing system 6 acts to enable the opening and closing state of a reversing valve 11 on the return branch pipe to correspond to the heating state of the coke oven, namely the reversing valve 11 on the waste gas branch pipe 13 corresponding to the small flue of the coke oven in an updraft state is in an opening state, and the reversing valve on the waste gas branch pipe 13 corresponding to the small flue of the coke oven in a downdraft state is in a closing state;
3) the flow of the returned flue gas is adjusted by a flue gas adjusting valve 10, and the returned flue gas enters a small flue through a return branch pipe 13 to deplete oxygen in the ascending gas flow, reduce the intensity of combustion reaction in a combustion chamber of the coke oven and reduce the generation amount of nitrogen oxides; the metal hose 12 is arranged on the return branch pipe 13 so as to facilitate installation and adjustment and ensure safe operation of the process system under the 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 (7)
1. A coke oven flue gas recollection process unit comprises a fan inlet regulating valve, a fan outlet regulating valve, a flowmeter, a reversing system, a compensator, a recollection main pipe, a flue gas regulating valve, a reversing valve, a metal hose, a recollection branch pipe and a waste gas recollection small flue connecting pipe, and is characterized in that the fan inlet is connected with a confluence flue gas intake port through the fan inlet regulating valve, and the outlet is connected with the recollection main pipe through the fan outlet regulating valve; the main return pipe is longitudinally arranged in an area between the side wall of the flue of the basement of the coke oven and the side column; the flowmeter is arranged in the return main pipe close to the end of the fan; the compensators are uniformly arranged on each section of the return main pipe; one end of the return branch pipe is connected with the return main pipe through a metal hose, a reversing valve and a flue gas regulating valve, and the other end of the return branch pipe is connected with a small flue connecting pipe for waste gas return; the reversing system is connected with the reversing valve.
2. The coke oven flue gas blending process unit of claim 1, wherein the reversing system is interlocked with a flue gas cylinder in the exchange gear.
3. The coke oven flue gas blending process device of claim 1, wherein the main blending pipe is composed of a plurality of sections of reducing pipes, and the diameter of the main blending pipe is changed along the longitudinal direction of the coke oven in a multistage manner.
4. The coke oven flue gas blending process unit of claim 1, wherein the fan is disposed on the top surface of the converging flue.
5. The coke oven flue gas blending process unit of claim 1, wherein the main blending pipe and the branch blending pipe are both provided with a heat insulation layer.
6. The coke oven flue gas blending process unit of claim 1, wherein fixed connection points are provided at both ends of the main blending pipe connected to the compensator.
7. The coke oven flue gas blending process unit of claim 1, wherein the flue gas blending small flue connecting pipe is connected with the small flue through a flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922374933.8U CN211595509U (en) | 2019-12-25 | 2019-12-25 | Coke oven flue gas blending process unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922374933.8U CN211595509U (en) | 2019-12-25 | 2019-12-25 | Coke oven flue gas blending process unit |
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| CN211595509U true CN211595509U (en) | 2020-09-29 |
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| CN201922374933.8U Active CN211595509U (en) | 2019-12-25 | 2019-12-25 | Coke oven flue gas blending process unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046176A (en) * | 2021-11-10 | 2022-02-15 | 长沙矿山研究院有限责任公司 | Access stope filling and roof connecting device and method |
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2019
- 2019-12-25 CN CN201922374933.8U patent/CN211595509U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046176A (en) * | 2021-11-10 | 2022-02-15 | 长沙矿山研究院有限责任公司 | Access stope filling and roof connecting device and method |
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