CN106762793B - Device for preventing shaft end of air blower from sealing and leaking coal gas - Google Patents
Device for preventing shaft end of air blower from sealing and leaking coal gas Download PDFInfo
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- CN106762793B CN106762793B CN201710002304.5A CN201710002304A CN106762793B CN 106762793 B CN106762793 B CN 106762793B CN 201710002304 A CN201710002304 A CN 201710002304A CN 106762793 B CN106762793 B CN 106762793B
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- gate valve
- gas
- pipeline
- fan
- blower
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/009—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by bleeding, by passing or recycling fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a device for preventing gas leakage at the shaft end sealing part of a blower, which comprises: the device comprises a fan shell (1), a comb-tooth-shaped seal (2), a rotor (3), a balance disc cavity (4), a gas recovery pipe (5), a ball valve (6), a grease cup (16), a first impeller (7), a second impeller (15), a first gate valve (9), a second gate valve (11), a third gate valve (12) and a fourth gate valve (8); the first impeller (7) and the second impeller (15) are sleeved on the rotor (3), the comb-tooth-shaped seal (2) is arranged at an air inlet end and an air outlet end, and the ball valve (6) is arranged at the air inlet end; the grease cup (16) is arranged at the air outlet end, a gas recovery pipeline (5) is laid at the air outlet end, and the second gate valve (11) and the third gate valve (12) are arranged on the gas recovery pipeline; a first gas pipeline (14) is laid between the first gas pipeline and the second gas pipeline, and the first gate valve (9) and the fourth gate valve (8) are respectively arranged on the gas outlet pipeline and the gas inlet pipeline.
Description
Technical Field
The invention relates to the technical field of coke oven gas purification, in particular to a device for preventing gas from leaking from the shaft end of an air blower in a sealing way.
Background
At present, a coal gas blower of a coking plant is key equipment in the whole coking production process, the reliability of the coal gas blower is very important, and the coal gas blower is increasingly paid more attention to the prevention of coal gas leakage at the shaft end sealing part of the blower. A shaft sleeve is arranged at a main shaft of an existing gas blower, as shown in figure 1, a comb-tooth-shaped seal 2 and a grease cup 16 are respectively arranged at an air inlet end and an air outlet end of a blower shell 1, a fourth gate valve and a first gate valve are respectively arranged on a gas inlet pipeline and a gas outlet pipeline, along with the operation of the blower, gas enters the blower shell along the gas inlet pipeline, one part of the gas is sent out along the gas outlet pipeline, the other part of the gas is damaged because a groove on the shaft sleeve 17 is filled with impurities such as tar, dust and the like, and the gas leaks at a shaft end seal of the blower.
In order to avoid the above situation, the conventional solution is to connect a hole reserved on the side surface of the lower part of the balance disc cavity at the air outlet end of the casing with an air inlet pipeline for recovering the gas leaked from the sealing part of the air outlet end, and use a grease cup at the air inlet end of the casing to squeeze the grease cup into the sealing part to enhance the sealing property. The method can effectively avoid gas leakage when the blower operates normally. However, when the gas blower is switched, the air inlet end and the air outlet end of the blower are all in a positive pressure state, which causes gas to leak from the shaft end seal.
The other method is that nitrogen flushing protection is adopted at the air inlet end and the air outlet end of the shell, and the nitrogen and the comb-tooth-shaped seal form combined seal. The method can reduce the gas leakage at the sealing position of the fan. However, the heat value is reduced due to the fact that nitrogen is mixed into the coal gas, the risk of suffocation of the nitrogen is increased due to the fact that the nitrogen is continuously introduced into the machine room, and the coal gas and the nitrogen can be leaked from the sealing position simultaneously in the switching process of the fan.
Although the two methods solve the problem of coal gas leakage in the running process of the fan, the problem of coal gas leakage in the switching process of the fan is not effectively controlled, the indoor coal gas concentration exceeds the standard when the fan is switched, and the safety risk in the operating process is increased.
Disclosure of Invention
The invention aims to solve the problems of the prior device for preventing gas leakage at the shaft end sealing part of the blower, and provides a device for preventing gas leakage at the shaft end sealing part of the blower, which comprises: the device comprises a fan shell, a comb-tooth-shaped seal, a rotor, a balance disc cavity, a gas recovery pipe, a ball valve, a grease cup, a first impeller, a second impeller, a first gate valve, a second gate valve, a third gate valve and a fourth gate valve; the rotor is arranged in the fan shell, penetrates through the air inlet end of the fan shell and the air outlet end of the fan shell, and is sleeved with the first impeller and the second impeller and arranged in the fan shell; the comb-tooth-shaped seal is arranged at the air inlet end and the air outlet end of the fan shell, and the ball valve is arranged at the air inlet end of the fan shell; the grease cup is arranged at the air outlet end of the fan shell, a gas recovery pipeline is laid at the air outlet end of the fan shell, the gas outlet of the gas recovery pipeline is communicated with the gas inlet of a gas inlet pipeline arranged outside the fan shell through a pipeline, and the second gate valve and the third gate valve are arranged on the gas recovery pipeline; lay first gas pipeline between this second gate valve and this third gate valve, this first gas pipeline's gas outlet and the gas inlet that is used for connecting the second gas pipeline of ball valve pass through the pipeline intercommunication, install this first gate valve on the outside coal gas outlet pipeline of this fan casing, install this fourth gate valve on the outside coal gas inlet pipeline of this fan casing.
One end of the fifth gate valve is connected to a coal gas inlet pipeline outside the fan shell, and the other end of the fifth gate valve is communicated with the gas outlet of the first coal gas pipeline and the gas inlet of the second coal gas pipeline through pipelines respectively to form a closed negative pressure pipeline.
When the fan is switched, the other end of the fifth gate valve is respectively communicated with the air outlet of the first gas pipeline and the air inlet of the second gas pipeline of the fan to be switched through pipelines.
The first gate valve, the second gate valve, the third gate valve and the fourth gate valve are respectively opened, the ball valve is closed, negative pressure is respectively formed at the comb-tooth-shaped seal and the balance disc cavity, and gas leakage at the air inlet end of the fan shell and the air outlet end of the fan shell is effectively prevented.
The second gate valve is used for balancing and improving the suction force generated by the negative pressure at the ball valve.
The second gate valve is used for balancing and improving the suction force generated by the negative pressure at the balancing disk cavity.
The second gate valve, the third gate valve, the fourth gate valve and the first gate valve are opened, the ball valve is closed, the air blower starts to work normally, coal gas enters the fan shell along the coal gas inlet pipeline, negative pressure is formed at the air inlet end of the fan shell and the air outlet end of the fan shell, the coal gas cannot leak at the air inlet end of the fan shell and the air outlet end of the fan shell, most of the coal gas can be discharged along the coal gas outlet pipeline, and residual coal gas can be returned to the coal gas inlet pipeline along the coal gas recovery pipeline for recycling.
When the fan is switched, the second gate valve, the third gate valve, the fourth gate valve and the first gate valve in the running fan are in an open state, and the ball valve of the running fan is in a closed state; simultaneously opening the ball valve, the fifth gate valve and the third gate valve of the fan to be switched, closing the second gate valve of the fan to be switched, opening the first gate valve of the fan to be switched, and then opening the fan to be switched to start working; then opening the fourth gate valve to ensure the normal work of the fourth gate valve, and closing the running fan; and then closing the second gate valve, the third gate valve, the fourth gate valve and the first gate valve in the running fan, then opening the second gate valve of the fan to be switched, closing the fifth gate valve of the fan to be switched, and finishing the switching operation.
The invention has the advantages that: when the fan is switched, the second gas pipeline at the air inlet end of the fan shell is always in a negative pressure state, the suction force generated by the negative pressure is utilized to effectively recover the gas leaked from the comb-tooth-shaped sealing positions at the air outlet end of the fan shell and the air inlet end of the fan shell, the standard exceeding of the gas in the fan chamber is relieved, the gas leaked from the comb-tooth-shaped sealing positions at the air outlet end of the fan shell and the air inlet end of the fan shell is not influenced by the pressure in the fan shell any more, and the zero leakage of the gas in the switching process is realized; the ball valve has the function of collecting gas under negative pressure, and prevents yellow dry oil from entering a comb-tooth-shaped seal and adhering impurities in the gas to damage a sealing sheet; the fifth gate valve is respectively communicated with the air inlet end of the fan shell and the air outlet end of the fan shell to form a closed negative pressure pipeline which is not influenced by the state of the fan.
Drawings
FIG. 1 is a schematic view of a conventional device for preventing gas leakage from a shaft end seal of a blower during switching of the blower
FIG. 2 is a schematic structural view of a device for preventing gas leakage from the shaft end seal of a blower in the invention
FIG. 3 is a schematic view of the device for preventing gas leakage from the shaft end seal of the blower in the invention when the blower is switched
1. Fan casing 2, comb-tooth type seal
3. Rotor 4, balance disc cavity
5. Gas recovery pipeline 6, ball valve
7. First impeller 8 and fourth gate valve
9. First gate valve 10, fifth gate valve
11. Second gate valve 12, third gate valve
13. Second gas pipeline 14 and first gas pipeline
15. Second impeller 16, yellow grease cup
17. Shaft sleeve
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, the present invention provides a device for preventing gas leakage at a shaft end seal of a blower, comprising: the device comprises a fan shell 1, a comb-tooth-shaped seal 2, a rotor 3, a balance disc cavity 4, a gas recovery pipe 5, a ball valve 6, a grease cup 16, a first impeller 7, a second impeller 15, a first gate valve 9, a second gate valve 11, a third gate valve 12 and a fourth gate valve 8; the rotor 3 is installed inside the fan casing 1, and the rotor 3 penetrates through the air inlet end of the fan casing 1 and the air outlet end of the fan casing 1, namely the left end and the right end; the first impeller 7 and the second impeller 15 are sleeved on the rotor 3 and are arranged inside the fan shell 1; the comb-tooth-shaped seal 2 is arranged at the left end and the right end of the fan shell 1; the ball valve 6 is arranged at the left end of the fan shell 1; the grease cup 16 is installed at the right end of the fan casing 1, the gas recovery pipeline 5 is laid at the right end of the fan casing 1, the gas outlet of the gas recovery pipeline 5 is communicated with the gas inlet of the gas inlet pipeline installed outside the fan casing 1 through a pipeline, and the second gate valve 11 and the third gate valve 12 are installed on the gas recovery pipeline 5; a first gas pipeline 14 is laid between the second gate valve 11 and the third gate valve 12, the gas outlet of the first gas pipeline 14 is communicated with the gas inlet of a second gas pipeline 13 used for connecting a ball valve through a pipeline, the first gate valve 9 is installed on the gas outlet pipeline outside the fan casing 1, and the fourth gate valve 8 is installed on the gas inlet pipeline outside the fan casing 1.
The upper end of the fifth gate valve 10 is connected to a gas inlet pipeline outside the blower housing 1, and the lower end of the fifth gate valve is respectively communicated with the gas outlet of the first gas pipeline 14 and the gas inlet of the second gas pipeline 13 through pipelines, so as to form a closed negative pressure pipeline.
The first gate valve 9, the second gate valve 11, the third gate valve 12 and the fourth gate valve 8 are respectively opened, the ball valve 6 is closed, negative pressure is respectively formed at the comb-tooth-shaped seal 2 and the balance disc cavity 4, and gas leakage at the left end of the fan shell 1 and the right end of the fan shell is effectively prevented.
The second gate valve 11 is used to balance and increase the suction force at the ball valve 6 due to the negative pressure.
As shown in fig. 3, when the blower performs a switching operation, the lower end of the fifth gate valve 10 is further respectively communicated with the air outlet of the first gas pipeline 14 and the air inlet of the second gas pipeline 13 of the blower to be switched through pipelines.
As shown in fig. 2, the second gate valve 11, the third gate valve 12, the fourth gate valve 8 and the first gate valve 9 are opened, the ball valve 6 is closed, the blower starts to work normally, and the coal gas enters the inside of the blower housing 1 along the coal gas inlet pipeline, because negative pressure is formed at both the left end of the blower housing 1 and the right end of the blower housing, the coal gas does not leak at the left end of the blower housing 1 and the right end of the blower housing 1, most of the coal gas is discharged along the coal gas outlet pipeline, and the residual coal gas returns to the coal gas inlet pipeline along the coal gas recycling pipeline 5 for recycling.
When the fan is switched, the second gate valve 11, the third gate valve 12, the fourth gate valve 8 and the first gate valve 9 in the running fan are in an open state, the ball valve 6 of the running fan is in a closed state, and a negative pressure ranging from-4000 Pa to-4500 Pa is formed at the closed state; simultaneously opening the ball valve 6, the fifth gate valve 10 and the third gate valve 12 of the fan to be switched, closing the second gate valve 11 of the fan to be switched, opening the first gate valve 9 of the fan to be switched, and then opening the fan to be switched to start working; at the moment, negative pressure ranging from-5000 Pa to-6000 Pa is formed at the ball valve 6 of the fan to be switched, and then the fourth gate valve 8 is opened to ensure normal work and close the running fan; and then closing the second gate valve 11, the third gate valve 12, the fourth gate valve 8 and the first gate valve 9 in the running fan, then opening the second gate valve 11 of the fan to be switched, closing the fifth gate valve 10 and the ball valve 6 of the fan to be switched, and completing the switching operation.
In a recycling secondary workshop of a coking plant of Laiwu division of iron and steel group in Shandong, the blower of the gas blower is switched, and by adopting the device for preventing the gas leakage at the shaft end sealing part of the blower, the indoor gas concentration is reduced to less than 10ppm from more than 1000ppm in the previous stage in the switching process of the blower, so that the effect of obviously reducing the gas concentration is achieved, and the production safety is effectively ensured.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A device for preventing gas leakage at a shaft end seal of a blower is characterized by comprising: the device comprises a fan shell (1), a comb-tooth-shaped seal (2), a rotor (3), a balance disc cavity (4), a gas recovery pipeline (5), a ball valve (6), a grease cup (16), a first impeller (7), a second impeller (15), a first gate valve (9), a second gate valve (11), a third gate valve (12) and a fourth gate valve (8); the rotor (3) is arranged inside the fan casing (1), the rotor (3) penetrates through the air inlet end of the fan casing (1) and the air outlet end of the fan casing (1), and the first impeller (7) and the second impeller (15) are sleeved on the rotor (3) and are arranged inside the fan casing (1); the comb-tooth-shaped seal (2) is arranged at the air inlet end of the fan shell (1) and the air outlet end of the fan shell (1), and the ball valve (6) is arranged at the air inlet end of the fan shell (1); the grease cup (16) is installed at the air outlet end of the fan shell (1), a coal gas recovery pipeline (5) is laid at the air outlet end of the fan shell (1), the air outlet of the coal gas recovery pipeline (5) is communicated with the air inlet of a coal gas inlet pipeline installed outside the fan shell (1) through a pipeline, and the second gate valve (11) and the third gate valve (12) are installed on the coal gas recovery pipeline (5); a first gas pipeline (14) is laid between the second gate valve (11) and the third gate valve (12), a gas outlet of the first gas pipeline (14) is communicated with a gas inlet of a second gas pipeline (13) used for being connected with the ball valve (6) through a pipeline, the first gate valve (9) is installed on a gas outlet pipeline outside the fan casing (1), and the fourth gate valve (8) is installed on a gas inlet pipeline outside the fan casing (1);
the device also comprises a fifth gate valve (10), one end of the fifth gate valve (10) is connected to a coal gas inlet pipeline outside the fan shell (1), and the other end of the fifth gate valve is respectively communicated with the gas outlet of the first coal gas pipeline (14) and the gas inlet of the second coal gas pipeline (13) through pipelines to form a closed negative pressure pipeline;
when the fan is switched, the other end of the fifth gate valve (10) is respectively communicated with the air outlet of the first gas pipeline (14) and the air inlet of the second gas pipeline (13) of the fan to be switched through pipelines.
2. The device for preventing gas leakage at the shaft end seal of a blower as claimed in claim 1, wherein the first gate valve, the second gate valve, the third gate valve and the fourth gate valve in the running blower are respectively opened, and the ball valve is closed, so that negative pressure is respectively formed at the comb-tooth-shaped seal (2) and the balance disc cavity (4).
3. The device for preventing gas leakage at the shaft end seal of a blower as claimed in claim 1, wherein the second gate valve (11) is used for balancing and increasing the suction force at the ball valve due to the negative pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710002304.5A CN106762793B (en) | 2017-01-03 | 2017-01-03 | Device for preventing shaft end of air blower from sealing and leaking coal gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710002304.5A CN106762793B (en) | 2017-01-03 | 2017-01-03 | Device for preventing shaft end of air blower from sealing and leaking coal gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106762793A CN106762793A (en) | 2017-05-31 |
| CN106762793B true CN106762793B (en) | 2023-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710002304.5A Active CN106762793B (en) | 2017-01-03 | 2017-01-03 | Device for preventing shaft end of air blower from sealing and leaking coal gas |
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| CN (1) | CN106762793B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109798260B (en) * | 2019-01-15 | 2020-11-06 | 临涣焦化股份有限公司 | Gas blower device |
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| CH106289A (en) * | 1923-10-31 | 1924-08-16 | Oerlikon Maschf | Pipeline system with several throttle valves, especially for fans that work together. |
| GB937349A (en) * | 1961-08-17 | 1963-09-18 | North Thames Gas Board | Improvements relating to gas pumps |
| CN2418280Y (en) * | 2000-04-13 | 2001-02-07 | 丁震华 | Boosted centrifugal air-blower for transfering coal gas |
| CN101285555A (en) * | 2007-04-10 | 2008-10-15 | 博莱克·威奇公司 | System and method for collecting and increasing the pressure of seal leak gas |
| CN201507468U (en) * | 2009-09-17 | 2010-06-16 | 江西铜业股份有限公司 | Negative pressure anti-oil leakage device of blower bearing box |
| CN202007791U (en) * | 2011-03-07 | 2011-10-12 | 江苏金通灵流体机械科技股份有限公司 | Multistage centrifugal type blower sealing device |
| CN203239619U (en) * | 2013-04-24 | 2013-10-16 | 莱芜钢铁集团有限公司 | Oil leakage prevention device used for fan bearing box |
| CN104564792A (en) * | 2015-01-26 | 2015-04-29 | 成都成发科能动力工程有限公司 | Controllable shaft end sealing structure of axial flow compressor |
| CN206503762U (en) * | 2017-01-03 | 2017-09-19 | 山东钢铁股份有限公司 | It is a kind of to prevent the device of air blower shaft end sealing leak coal gas |
-
2017
- 2017-01-03 CN CN201710002304.5A patent/CN106762793B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH106289A (en) * | 1923-10-31 | 1924-08-16 | Oerlikon Maschf | Pipeline system with several throttle valves, especially for fans that work together. |
| GB937349A (en) * | 1961-08-17 | 1963-09-18 | North Thames Gas Board | Improvements relating to gas pumps |
| CN2418280Y (en) * | 2000-04-13 | 2001-02-07 | 丁震华 | Boosted centrifugal air-blower for transfering coal gas |
| CN101285555A (en) * | 2007-04-10 | 2008-10-15 | 博莱克·威奇公司 | System and method for collecting and increasing the pressure of seal leak gas |
| CN201507468U (en) * | 2009-09-17 | 2010-06-16 | 江西铜业股份有限公司 | Negative pressure anti-oil leakage device of blower bearing box |
| CN202007791U (en) * | 2011-03-07 | 2011-10-12 | 江苏金通灵流体机械科技股份有限公司 | Multistage centrifugal type blower sealing device |
| CN203239619U (en) * | 2013-04-24 | 2013-10-16 | 莱芜钢铁集团有限公司 | Oil leakage prevention device used for fan bearing box |
| CN104564792A (en) * | 2015-01-26 | 2015-04-29 | 成都成发科能动力工程有限公司 | Controllable shaft end sealing structure of axial flow compressor |
| CN206503762U (en) * | 2017-01-03 | 2017-09-19 | 山东钢铁股份有限公司 | It is a kind of to prevent the device of air blower shaft end sealing leak coal gas |
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| CN106762793A (en) | 2017-05-31 |
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