CN219824254U - Blast furnace damping down gas recovery device - Google Patents
Blast furnace damping down gas recovery device Download PDFInfo
- Publication number
- CN219824254U CN219824254U CN202320211057.0U CN202320211057U CN219824254U CN 219824254 U CN219824254 U CN 219824254U CN 202320211057 U CN202320211057 U CN 202320211057U CN 219824254 U CN219824254 U CN 219824254U
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- gas
- pipeline
- air
- blast furnace
- regulating valve
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- 238000011084 recovery Methods 0.000 title claims abstract description 36
- 238000013016 damping Methods 0.000 title claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims description 99
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 241000918585 Pythium aphanidermatum Species 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
A blast furnace damping-down gas recovery device is invented to solve the technical defect that raw gas is discharged to the outside of a furnace in the existing blast furnace damping-down process. The system comprises the existing system equipment and is characterized in that a pressure regulating valve group is arranged on an existing gas pipeline, and two ends of the pressure regulating valve group are connected with a gas recovery device in parallel; the gas recovery device consists of an air extractor, an air suction pipeline, an air outlet pipeline and an air assisting pipeline, wherein the air suction pipeline provided with a cut-off valve and a check valve is connected with the air inlet end of the pressure regulating valve group, and a A, B, C, D option is arranged at the connection point of the air suction pipeline; the auxiliary gas pipeline provided with a flow regulating valve and a high-pressure gas shut-off valve is connected with a high-pressure gas source; the air outlet pipeline is connected to the air outlet end of the pressure regulating valve set and has E or F point option. The blast furnace does not discharge raw gas to the outside of the furnace in the whole damping down process, and has the characteristics of strong adaptability, sensitive reaction, safety, reliability, smooth operation and the like, so that the whole recovery of the damping down gas of the blast furnace can be realized, and the environmental pollution and the energy waste are avoided.
Description
Technical field:
the utility model belongs to the technical field of blast furnace damping down, and particularly relates to a recovery device of blast furnace damping down gas.
The background technology is as follows:
the blast furnace must be shut down for maintenance, middle maintenance, overhaul or other reasons when shut down is required. The blowing-down is to cut off the blast furnace and the gas system and communicate with the atmosphere, and at the same time, the blast furnace is stopped from blowing. The traditional blast furnace damping down method comprises the following steps: firstly, a furnace top relief valve is opened to discharge raw gas to the outside of the furnace, then a gas system is closed, and then air supply is stopped. The disadvantages of this method are clearly two: firstly, a large amount of coal gas discharged from the furnace top in the blast furnace damping down process has potential safety hazard and seriously pollutes the environment because of dust-containing, high temperature, toxicity, flammability and explosiveness; and the gas is also an energy source, so that the gas can run off in the damping down process, and the energy source is wasted. For this reason, chinese patent discloses several techniques for recovering blast furnace damping-off gas, and the "gas recovery device for blast furnace damping-off gas" disclosed in CN 211665118U is one example thereof, and the "gas-cutting" process is herein referred to as "damping-off" process. The patent intends to solve the above-mentioned drawbacks of the prior art by arranging a gas recovery device in parallel at both ends of the existing gas grid-connected valve. However, the actual effect is not ideal, and the reason is mainly that: the patent only connects the recovery device in parallel at two ends of the gas grid-connected valve, and the gas grid-connected valve needs to be closed when recovering the damping-down gas, so that the gas grid-connected valve cannot be adjusted according to the change of the gas quantity, and has poor adaptability, thereby affecting smooth operation and recovery effect. Furthermore, since the exhaust pipe of the blast furnace damping-down gas recovery device is directly connected to the gas pipe network, the operation of punching holes under pressure is required, which in turn makes construction difficult.
The utility model comprises the following steps:
the purpose of the utility model is that: aiming at the defects of the prior art, the blast furnace damping-down gas recovery device has the characteristics of strong adaptability, flexible adjustment, safety, reliability, smooth operation, convenient installation and the like, and can practically realize the full efficient recovery of the blast furnace damping-down gas, thereby avoiding environmental pollution and energy waste.
The technical scheme of the utility model is as follows: the utility model provides a blast furnace damping down gas recovery unit, utilizes current system equipment facility, includes blast furnace raw coke oven gas relief valve, gas pipeline air-vent valve group, gas pipe network, its characterized in that: an air extractor is arranged between the blast furnace raw gas diffusion valve and the gas pipe network and spans across the gas pipeline pressure regulating valve group; the air extractor consists of an air extractor, an air suction pipeline, an air outlet pipeline and an air assisting pipeline, wherein the air suction pipeline of the air extractor is connected to a pipeline in front of the pressure regulating valve group, the air outlet pipeline of the air extractor is connected to a pipeline behind the pressure regulating valve group, and the air assisting pipeline of the air extractor is connected to a high-pressure air source.
The air suction pipeline is provided with a check valve and a shut-off valve.
The auxiliary gas pipeline is provided with a flow regulating valve and a high-pressure gas shut-off valve.
The suction pipeline of the air extractor is connected to a pipeline in front of the pressure regulating valve group, and the connection point is any point of A, B, C, D points.
The air outlet pipeline of the air extractor is connected to the pipeline behind the pressure regulating valve set, and the connection point is E point or F point.
The air extractor is an ejector or a draught fan.
The high-pressure gas source is nitrogen, high-pressure coal gas or steam.
Compared with the prior art, the utility model has the following advantages:
1. the blast furnace damping-down gas recovery device provided by the utility model can fully recover and send the blast furnace damping-down gas into the gas pipe network, so that the technical effect that the blast furnace damping-down does not discharge raw gas to the outside of the furnace is realized, the problems of environmental pollution and potential safety hazard are thoroughly solved, and the energy sources are also recovered and saved.
2. Because the blast furnace damping-down gas recovery device is provided with the check valve, the damping-down process gas always has a reliable passage and can ensure that the gas of the gas pipe network can not flow backwards.
3. Because the gas recovery device is bridged at the two sides of the pressure regulating valve group, the cooperative operation of the recovery device and the pressure regulating valve group can be realized, and therefore, the flexible regulation of the recovery state can be realized, and the recovery process can be smoothly operated.
4. The gas flow regulating range of the pressure regulating valve group is large, so that the pressure regulating valve group can face gas flow fluctuation caused by the reasons of blast furnace material collapse, water leakage of cooling equipment and the like, and the adaptability can be enhanced, and the safety guarantee can be improved.
5. Because the mounting positions of the air inlet pipeline and the air outlet pipeline of the air extractor are selected in multiple ways, the mounting can be flexibly mastered according to the actual production requirement, and the engineering implementation and the application operation are convenient.
6. Because the blast pipe of the blast furnace damping down gas recovery device is not required to be directly connected with a gas pipe network, the pressurized tapping operation is avoided, and the blast furnace damping down gas recovery device is more convenient to install and construct.
7. The ejector or the induced draft fan of the air extractor can adaptively recycle the coal gas according to different working conditions in the production process, so the utility model has strong practicability and wide popularization.
Description of the drawings:
FIG. 1 is a schematic diagram of the construction of the working system and gas recovery device of the present utility model.
Reference numerals illustrate:
a cold air duct 1; a blow-off valve 2; a hot air furnace group 3; a hot air duct 4; a blast furnace 5; a raw gas pipe 6; a blast furnace raw gas bleeding valve 7; a gas shutoff valve 8; a gravity dust collector 9; a semi-clean gas conduit 10; a bag-type dust collector 11; a clean gas conduit 12; a pressure regulating valve group 13; a gas grid-connected valve 14; a gas pipe network 15; an air suction line; a shut-off valve 17; a check valve 18; an air extractor 19; a flow rate regulating valve 20; a high-pressure gas shut-off valve 21; a gas assist line 22; and an outlet gas line 23.
The specific embodiment is as follows:
the present utility model will be described in detail with reference to the accompanying drawings.
As shown in fig. 1: the utility model provides a blast furnace damping down gas recovery unit, utilizes current system equipment facility, includes blast furnace raw coke oven gas relief valve 7, gas pipeline air-vent valve group 13, gas pipe network 15, its characterized in that: an air extraction device is arranged between the blast furnace raw gas diffusion valve 7 and the gas pipe network 15 and spans across the gas pipeline pressure regulating valve group 13; the air extractor consists of an air extractor 19, an air suction pipeline 16, an air outlet pipeline 23 and an air assisting pipeline 22, wherein the air suction pipeline 16 of the air extractor 19 is connected to a pipeline in front of the pressure regulating valve group 13, the air outlet pipeline 23 of the air extractor 19 is connected to a pipeline behind the pressure regulating valve group 13, and the air assisting pipeline 22 of the air extractor 19 is connected to a high-pressure air source.
Here, a shut-off valve 17 and a non-return valve 18 are provided in the intake line 16, and a flow control valve 20 and a high-pressure gas shut-off valve 21 are provided in the auxiliary line 22.
The suction pipe 16 of the air extractor 19 is connected to the pipe in front of the pressure regulating valve group 13, and the connection is A, B, C, D four points, and any point can be selected according to the actual situation. The outlet pipe 23 of the air extractor 19 is connected to the pipe behind the pressure regulating valve group 13, and the connection part also has two options of E point or F point.
The air extractor device can adopt two modes, one is an ejector, and the connected high-pressure gas pipeline 22 and the high-pressure gas shut-off valve 21 and the flow regulating valve 20 thereon, wherein the high-pressure gas is nitrogen, high-pressure gas or steam; and then passes through a gas recovery device consisting of an air extractor (ejector) 19, an air suction pipeline 16, a cut-off valve 17, a check valve 18 and an air outlet pipeline 23. Another way is to use a common induced draft fan. The figure shows the former.
With the gas recovery device, the whole damping down process can be completed through the following steps:
(1) The air supply system is operated to reduce the air supply quantity and the pressure regulating valve group 13 is opened to gradually reduce the pressure of the raw gas at the top of the furnace;
(2) Then, the cut-off valve 17 of the gas recovery device is opened to enable the gas recovery device to be put into operation, and the gas flows to the gas pipe network 15 under the suction effect of the air extractor (ejector) 19 or the induced draft fan;
(3) When the air supply amount is reduced to a set value, closing the pressure regulating valve group 13;
(4) Continuously reducing the air supply amount until the air valve 2 is fully opened, and stopping air supply;
(5) When the pressure of the furnace top is reduced to micro positive pressure through the flow regulating valve 20, the valve 17 of the gas recovery device is closed, the high-pressure gas cut-off valve 21 is closed, the blast furnace raw gas relief valve 7 is opened, the gas grid-connected valve 14 is closed, and the gas cut-off valve 8 is closed;
(6) And converting the state of the hot air furnace group 3 into a damping down state.
The blast furnace does not discharge raw gas to the outside of the furnace in the whole damping down process, and the damping down gas flows into a gas pipe network.
Claims (6)
1. The utility model provides a blast furnace damping down gas recovery unit, utilizes current system equipment facility, includes blast furnace raw coke oven gas relief valve (7), gas pipeline air-vent valve group (13), gas pipe network (15), its characterized in that: an air extractor is arranged between the blast furnace raw gas diffusion valve (7) and the gas pipe network (15) and spans across the gas pipeline pressure regulating valve group (13); the air extractor consists of an air extractor (19), an air suction pipeline (16), an air outlet pipeline (23) and an air assisting pipeline (22), wherein the air suction pipeline (16) of the air extractor (19) is connected to a pipeline in front of the pressure regulating valve group (13), the air outlet pipeline (23) of the air extractor (19) is connected to a pipeline behind the pressure regulating valve group (13), and the air assisting pipeline (22) of the air extractor (19) is connected to a high-pressure air source.
2. The blast furnace damping down gas recovery device according to claim 1, wherein: wherein the air suction pipeline (16) is provided with a check valve (18) and a cut-off valve (17).
3. The blast furnace damping down gas recovery device according to claim 1, wherein: a flow regulating valve (20) and a high-pressure gas shut-off valve (21) are arranged on the auxiliary gas pipeline (22).
4. The blast furnace damping down gas recovery device according to claim 1, wherein: the air suction pipeline (16) of the air extractor (19) is connected to a pipeline in front of the pressure regulating valve group (13), the connection point is any point of A, B, C, D points, and the air outlet pipeline (23) of the air extractor (19) is connected to a pipeline in back of the pressure regulating valve group (13), and the connection point is E point or F point.
5. The blast furnace damping down gas recovery apparatus according to claim 1 or 4, wherein: the air extractor (19) is an ejector or an induced draft fan.
6. The blast furnace damping down gas recovery device according to claim 5, wherein: the high-pressure gas source is nitrogen, high-pressure gas or steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320211057.0U CN219824254U (en) | 2023-01-31 | 2023-01-31 | Blast furnace damping down gas recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320211057.0U CN219824254U (en) | 2023-01-31 | 2023-01-31 | Blast furnace damping down gas recovery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219824254U true CN219824254U (en) | 2023-10-13 |
Family
ID=88277222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320211057.0U Active CN219824254U (en) | 2023-01-31 | 2023-01-31 | Blast furnace damping down gas recovery device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219824254U (en) |
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2023
- 2023-01-31 CN CN202320211057.0U patent/CN219824254U/en active Active
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