CN113606159A - Fully-sealed fan for flue gas recirculation and sealing monitoring method - Google Patents
Fully-sealed fan for flue gas recirculation and sealing monitoring method Download PDFInfo
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- CN113606159A CN113606159A CN202110749734.XA CN202110749734A CN113606159A CN 113606159 A CN113606159 A CN 113606159A CN 202110749734 A CN202110749734 A CN 202110749734A CN 113606159 A CN113606159 A CN 113606159A
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- 238000007789 sealing Methods 0.000 title claims abstract description 101
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000003546 flue gas Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 78
- 238000011049 filling Methods 0.000 claims abstract description 4
- 238000004880 explosion Methods 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 241000886569 Cyprogenia stegaria Species 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Images
Classifications
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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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
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- 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
- F04D29/083—Sealings especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention provides a full-sealed fan for flue gas recirculation and a sealing monitoring method, wherein the system comprises the fan, a sealing cover and a sealed gas inlet pipeline, wherein a shell and a bearing of the fan are arranged in the sealing cover; the air inlet of the fan is communicated with a flue gas inlet pipeline, and the air outlet of the fan is communicated with a flue gas outlet pipeline; the flue gas inlet pipeline and the flue gas outlet pipeline extend out of the sealing cover; the sealing cover is provided with an explosion-proof opening; the sealing gas inlet pipeline is used for filling sealing gas into the sealing cover, and the sealing gas inlet pipeline is arranged outside the sealing cover and communicated with the sealing cover. According to the invention, the sealing cover covers all possible leakage points of the fan, and high-pressure gas is introduced through the sealing gas inlet pipeline, so that the pressure in the sealing cover is higher than that in the fan shell, therefore, zero leakage of smoke in the fan is realized, and the sealing effect of the fan can be monitored in real time.
Description
Technical Field
The invention belongs to the technical field of flue gas recirculation, and particularly relates to a fully-sealed fan for flue gas recirculation and a sealing monitoring method.
Background
The waste incineration treatment is a waste treatment technology widely used at present, dioxin highly toxic substances in incineration smoke can cause great harm to the environment, the waste incineration treatment is a problem of great social attention, the diffusion of the dioxin substances is effectively controlled, and the popularization and the application of a waste incineration power generation technology are directly related. Flue gas recirculation is a low-nitrogen combustion technology, and gradually becomes one of the conventional flue gas purification processes of a power plant, wherein an outlet of a waste heat boiler is used as an air extraction opening for flue gas recirculation, and medium-temperature flue gas is fed into a waste incinerator through a fan, so that the method is a more advanced recirculation technical route. However, the flue gas at the position is not removed with dioxin, so that complete sealing in the conveying process must be ensured, the leakage of the recycled flue gas is prevented, and otherwise, the environmental safety is influenced. Because the fan rotates at high speed under normal conditions, positive pressure exists in the shell, and under the action of pressure difference, the joints of the mechanical parts comprise the shell, the parts between the shell and the inlet/outlet assembly, between the shell and the bearing, and the parts with gaps such as flanges and the like, and the leakage risk exists. Therefore, the fan becomes the most critical sealing part in the whole recirculation system due to the high leakage rate of the fan. The reasons for the fan leakage are: due to the machined structure, various defects, shapes and size deviations are inevitably generated on the surface of a mechanical product, so that a gap is inevitably generated at the joint of mechanical parts, and a medium leaks through the gap due to the pressure difference between the inner side and the outer side of the fan. That is, there is a risk of leakage at various locations, such as the fan casing, the bearings, and the connections of the parts.
The sealing technology of the prior art for the air blower has the following defects: 1) measures are taken locally, such as strengthening sealing between a fan shell and a bearing to avoid leakage of a medium from a gap, or arranging a counter blade on a rear disc of an impeller to reduce positive pressure between shafts so as to weaken the force of leakage of the medium, and the like, and the whole fan cannot be covered, so that the operation and safety requirements are difficult to meet. 2) In a fan in the prior art, the fan is arranged in a sealing tank capable of bearing larger pressure, an air inlet of the fan is communicated with air in the sealing tank, air entering the fan due to poor sealing is changed from leakage outside the system into leakage inside the system, and air leakage of the system is completely avoided. However, this method is not suitable for circulating flue gas containing pollutants such as fly ash particles and acidic gases at the outlet of the waste heat boiler, and the flow size of the flue gas should not be enlarged from the original air inlet of the fan to the whole sealed tank, otherwise the equipment in the tank may be damaged.
Disclosure of Invention
The invention aims to provide a fully-sealed fan for flue gas recirculation and a sealing monitoring method, which can realize full sealing of the fan in a flue gas recirculation process, can realize real-time monitoring of pressure in the fan and ensure zero-leakage operation of the fan. In order to achieve the purpose, the invention adopts the following technical scheme:
a fully enclosed fan for flue gas recirculation, comprising:
the shell and the bearing of the fan are both arranged in a sealing cover; the air inlet of the fan is communicated with a flue gas inlet pipeline, and the air outlet of the fan is communicated with a flue gas outlet pipeline; the flue gas inlet pipeline and the flue gas outlet pipeline both extend out of the sealing cover; an explosion-proof opening is formed in the sealing cover;
and the sealing gas inlet pipeline is used for filling sealing gas into the sealing cover, and the sealing gas inlet pipeline is arranged outside the sealing cover and communicated with the sealing cover.
Preferably, the number of the sealed gas inlet pipelines is multiple, and the input ends of all the sealed gas inlet pipelines are communicated with the output end of the same sealed gas main pipeline.
Preferably, a pressure reducing valve is arranged on the sealing gas main pipeline.
Preferably, a pressure detector is arranged in the sealing cover.
Preferably, a gas heater is arranged on the sealing gas main pipe.
Preferably, high-pressure gas is introduced into the sealing gas main pipeline.
A sealing monitoring method for a full-sealed fan for flue gas recirculation is based on the full-sealed fan for flue gas recirculation and comprises the following steps:
s1, the pressure detector monitors the air pressure P in the sealing cover in real time and transmits the pressure value to the control unit in real time, and the control unit judges whether the air pressure P is in a set range; if not, go to S2; otherwise, the control unit outputs a normal signal to the display screen;
s2, the control unit respectively judges the air pressure P value and the upper limit value in the set range and the size between the air pressure P value and the lower limit value in the set range, if the air pressure P value is higher than the upper limit value, S3 is executed, and if the air pressure P value is lower than the lower limit value, S4 is executed;
s3, the control unit judges the relation between the air pressure P value and the explosion point, if the air pressure P value is larger than or equal to the explosion point, the explosion-proof opening is opened; otherwise, the explosion-proof port is kept closed, and the control unit adjusts the pressure reducing valve to reduce the air pressure in the sealing cover;
s4, the control unit judges the relation between the air pressure P value and the leakage point, if the air pressure P value is less than or equal to the leakage point, the control point starts the alarm device; otherwise, the alarm device does not act, and the control unit adjusts the pressure reducing valve so as to increase the air pressure in the sealing cover.
PreferablyThe rated wind pressure value of the fan is P0The upper limit value in the set range is 1.3P0The lower limit value in the set range is 1.2P0。
Preferably, the leakage point is P0。
Preferably, before S1, the method further includes: the control unit starts the gas heater, then compressed gas is filled into the sealed gas main pipeline, and the gas heater heats the compressed gas to the acid dew point of the flue gas.
Compared with the prior art, the invention has the advantages that:
(1) the sealing cover extends from the fan air inlet to the bearing along the horizontal direction and extends from the bottom of the machine shell to the fan air outlet along the height direction, so that the sealing cover covers all possible leakage points of the fan. Meanwhile, high-pressure gas is introduced through the sealing gas inlet pipeline, so that the pressure in the sealing cover is higher than that in the fan shell, the flue gas leaked into the sealing cover is forced to flow back, no flue gas is leaked into the sealing cover, and zero leakage of the flue gas in the fan is realized.
(2) The fan air intake and flue gas inlet pipeline intercommunication, flue gas inlet pipeline extend the sealed cowling, therefore the air in fan air intake and the sealed cowling does not communicate with each other to avoid the flue gas circulation to whole sealed cowling, do not influence the operation mode of fan prior art, be applicable to the msw incineration field.
(3) The pressure reducing valve, the pressure detector and the explosion-proof port are interlocked to form PID regulation and high-pressure gas is automatically regulated, so that the pressure in the sealing cover is slightly higher than the pressure in the fan, medium smoke in the fan is ensured to escape to the sealing cover, and the sealing effect is achieved. From this, realized the real-time supervision to sealed effect to the risk is revealed in the precaution, improves sealed monitoring's degree of automation.
Drawings
FIG. 1 is a side view of a fully enclosed fan for flue gas recirculation according to an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of the seal gas and flue gas in the hermetically sealed fan for flue gas recirculation of FIG. 1;
FIG. 3 is a flow chart of a seal monitoring method for a hermetically sealed fan for flue gas recirculation.
The device comprises an impeller 1, a casing 2, a bearing 3, a coupling 4, a motor 5, a base 6, a sealing cover 7, a flue gas inlet pipeline 8, a flue gas outlet pipeline 9, a sealing gas inlet pipeline 10, an explosion-proof port 11, a flexible connection 12, a pressure reducing valve 13, a gas heater 14 and a sealing gas main pipeline 15.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying schematic drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
As shown in fig. 1-2, a fully enclosed fan for flue gas recirculation includes: a fan, a sealing cover 7 and a sealing gas inlet pipeline 10.
The fan comprises a casing 2, an impeller 1, a bearing 3, a coupling 4, a base 6 and a motor 5, and the assembling structure and the connection mode of the assembling structure and the connection mode are the prior art and are not described herein.
The sealing cover 7 is used for placing the shell 2 and the bearing 3 of the fan inside; the air inlet of the fan is communicated with a flue gas inlet pipeline 8, and the air outlet of the fan is communicated with a flue gas outlet pipeline 9 through a flexible connection 12; the flue gas inlet pipeline 8 and the flue gas outlet pipeline 9 extend out of the sealing cover 7; the sealing cover 7 is provided with an explosion-proof opening 11, and when the pressure in the sealing cover 7 is too high, auxiliary pressure discharge can be realized; a pressure detector (gas detector) is arranged in the sealing cover 7 and used for indicating the air pressure in the sealing cover 7. From the above, it can be seen that: the flue gas inlet pipeline 8, the flue gas outlet pipeline 9 and the sealing cover 7 are not communicated. The sealing cover 7 covers the shell itself, the space between the shell 2 and the flue gas inlet pipeline 8, the space between the shell 2 and the flue gas outlet pipeline 9, the space between the shell 2 and the bearing 3, and the space between the shell 2 and the flange.
And the sealing gas inlet pipeline 10 is used for filling sealing gas into the sealing cover 7, and the sealing gas inlet pipeline 10 is arranged outside the sealing cover 7 and communicated with the sealing cover 7. Wherein, the sealing gas (high-pressure gas) adopts compressed air or nitrogen. In other embodiments other than this embodiment, the high pressure gas may be other gases.
As shown in fig. 2, the number of the sealed gas inlet pipes 10 is 2, and the input ends of all the sealed gas inlet pipes 10 are communicated with the output end of the same sealed gas main pipe 15. The sealing gas main pipe 15 functions to stabilize the wind pressure at the input end of the sealing gas inlet pipe 10. High-pressure gas is introduced into the sealed gas main pipeline 15; the seal gas main pipe 15 is provided with a pressure reducing valve 13 and a gas heater 14. In other embodiments other than this embodiment, the number of the seal gas inlet pipes 10 and the position of the input end are not limited.
If the gas pressure in the sealing cover 7 is too high, the process difficulty of the sealing cover 7 may be increased; if the gas pressure is too low, zero leakage of the medium in the fan cannot be ensured. The pressure reducing valve 13 thus functions to regulate the pressure of the compressed air.
The gas heater 14 functions as follows: because the flue gas at the outlet of the boiler is 220 ℃ and contains acidic gas, if the compressed air is at normal temperature, when the compressed air presses the escaped flue gas to return, a small amount of compressed air can pass through the gap and even enter the fan, the temperature of the flue gas is reduced after the flue gas meets the pressure, and a certain corrosion risk exists, so that the compressed air is heated to be higher than the acid dew point of the flue gas. Of course, only a small amount of compressed air may flow inside the casing 2, and if it is found by practical observation that no corrosion risk is posed, the electric heating may be eliminated.
Therefore, the compressed gas sequentially passes through the pressure reducing valve 13, the gas heater 14 and the sealed gas main pipeline 15 to respectively realize pressure regulation, gas heating and wind pressure stabilization, and the safe operation of the sealing structure is assisted to be realized.
Based on the above-mentioned fully sealed fan, this embodiment also provides a sealing monitoring method for a fully sealed fan for flue gas recirculation, as shown in fig. 3.
Firstly, the control unit starts the gas heater 14, then compressed gas is filled into the sealed gas main pipeline 15, and the gas heater 14 heats the compressed gas to the acid dew point of the flue gas. Then, steps S1 to S4 are performed.
And S1, acquiring the air pressure P in the sealing cover 7 in real time.
The pressure detector monitors the air pressure P in the sealing cover 7 in real time, and transmits the pressure value to the control unit in real time, and the control unit judges whether the air pressure P is in a set range. If not, go to S2; otherwise, the control unit outputs a normal signal to the display screen.
S2, judging whether the air pressure P value is in the set range.
In this embodiment, the rated wind pressure value of the fan is P0The upper limit value in the set range is 1.3P0The lower limit value in the set range is 1.2P0I.e. setting the range to [1.2P ]0，1.3P0]. When the fan is running, the pressure in the shell 2 can not exceed P0Therefore, when the P value is 1.2-1.3 times of P0When the pressure is higher than the pressure in the shell 2, the pressure in the sealing cover 7 is slightly higher than the pressure in the shell 2, and complete sealing is realized; when the P value is less than P0At this point, it is difficult to ensure that the pressure inside the sealing cover 7 is higher than the pressure inside the casing 2, which may cause a leakage risk. In other embodiments other than this embodiment, the setting range of the P value may be specifically selected.
Specifically, the control unit determines the air pressure P value and the upper limit value in the setting range, and the size between the air pressure P value and the lower limit value in the setting range, and if the air pressure P value is higher than the upper limit value, S3 is executed; if the pressure P is lower than the lower limit, S4 is executed.
S3, it is determined whether the pressure P reaches the explosion point (i.e., a pressure at which the sealed cover 7 may explode). Wherein, the explosion point is determined by the material of the sealing cover 7.
The control unit judges the relation between the air pressure P value and the explosion point, if the air pressure P value is larger than or equal to the explosion point, the explosion-proof port 11 is automatically opened, when the pressure in the sealing cover 7 is gradually recovered to be smaller than the upper limit of the set range, the explosion-proof port 11 receives a signal of the control unit, and the explosion-proof port 11 is automatically closed. Otherwise, the explosion vent 11 remains closed and the control unit adjusts the pressure relief valve 13 to reduce the air pressure within the sealed enclosure 7. As will be appreciated by those skilled in the art, the structure of the explosion vent 11 and the control manner between the explosion vent 11 and the control unit are all known in the art.
S4, determine whether the pressure P reaches the leakage point (i.e. a pressure value at which the pressure is too low to achieve full sealing). Wherein the leakage point is P0。
The control unit judges the relation between the air pressure P value and the leakage point, if the air pressure P value is less than or equal to the leakage point P0And the control point starts the alarm device and immediately checks the whole system, so that the pressure in the cover is restored to the set range as soon as possible. Otherwise, the alarm device is deactivated and the control unit adjusts the pressure relief valve 13 to increase the air pressure in the sealing cap 7.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A hermetically sealed fan for flue gas recirculation, comprising:
the shell and the bearing of the fan are both arranged in a sealing cover; the air inlet of the fan is communicated with a flue gas inlet pipeline, and the air outlet of the fan is communicated with a flue gas outlet pipeline; the flue gas inlet pipeline and the flue gas outlet pipeline both extend out of the sealing cover; an explosion-proof opening is formed in the sealing cover;
and the sealing gas inlet pipeline is used for filling sealing gas into the sealing cover, and the sealing gas inlet pipeline is arranged outside the sealing cover and communicated with the sealing cover.
2. The all-sealed fan for flue gas recirculation according to claim 1, wherein the number of the sealed gas inlet pipes is multiple, and the input ends of all the sealed gas inlet pipes are communicated with the output end of the same sealed gas main pipe.
3. The all-sealed fan for flue gas recirculation according to claim 2, wherein a pressure reducing valve is provided on the sealed gas main.
4. The hermetically sealed fan for flue gas recirculation of claim 3, wherein a pressure detector is disposed within the sealed enclosure.
5. The all-sealed fan for flue gas recirculation according to claim 3, wherein a gas heater is provided on the sealed gas main.
6. The all-sealed fan for flue gas recirculation according to claim 3, wherein the sealed gas main is filled with high-pressure gas.
7. A sealing monitoring method for a full-sealed fan for flue gas recirculation based on any one of claims 3 to 6, characterized by comprising the following steps:
s1, the pressure detector monitors the air pressure P in the sealing cover in real time and transmits the pressure value to the control unit in real time, and the control unit judges whether the air pressure P is in a set range; if not, go to S2; otherwise, the control unit outputs a normal signal to the display screen;
s2, the control unit respectively judges the air pressure P value and the upper limit value in the set range and the size between the air pressure P value and the lower limit value in the set range, if the air pressure P value is higher than the upper limit value, S3 is executed, and if the air pressure P value is lower than the lower limit value, S4 is executed;
s3, the control unit judges the relation between the air pressure P value and the explosion point, if the air pressure P value is larger than or equal to the explosion point, the explosion-proof opening is opened; otherwise, the explosion-proof port is kept closed, and the control unit adjusts the pressure reducing valve to reduce the air pressure in the sealing cover;
s4, the control unit judges the relation between the air pressure P value and the leakage point, if the air pressure P value is less than or equal to the leakage point, the control point starts the alarm device; otherwise, the alarm device does not act, and the control unit adjusts the pressure reducing valve so as to increase the air pressure in the sealing cover.
8. The seal monitoring method for a totally enclosed fan for flue gas recirculation according to claim 7, wherein said fan has a rated wind pressure value of P0The upper limit value in the set range is 1.3P0The lower limit value in the set range is 1.2P0。
9. The seal monitoring method for a hermetically sealed fan for flue gas recirculation according to claim 7, wherein the leakage point is P0。
10. The seal monitoring method for a hermetically sealed fan for flue gas recirculation of claim 7, further comprising, before S1: the control unit starts the gas heater, then compressed gas is filled into the sealed gas main pipeline, and the gas heater heats the compressed gas to the acid dew point of the flue gas.
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| CN202110749734.XA CN113606159A (en) | 2021-07-02 | 2021-07-02 | Fully-sealed fan for flue gas recirculation and sealing monitoring method |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2727508Y (en) * | 2004-08-30 | 2005-09-21 | 邢台钢铁有限责任公司 | Gas fan sealing device |
| CN102878108A (en) * | 2012-09-21 | 2013-01-16 | 西安陕鼓动力股份有限公司 | Inlet air sealing device for axial air feeding type air compressor |
| CN103850985A (en) * | 2014-03-20 | 2014-06-11 | 合肥通用机械研究院 | Fan adopting shell heat tracing and sealed buffer gas heating |
| CN104343721A (en) * | 2013-07-31 | 2015-02-11 | 李玉富 | Fan sealing device |
| CN105927541A (en) * | 2016-05-26 | 2016-09-07 | 无锡联合超滤净化设备科技有限公司 | Blowing or induced draft device for pressurizing combustible and explosive as well as corrosive gases |
| CN206129681U (en) * | 2016-09-30 | 2017-04-26 | 上海德惠特种风机有限公司 | High temperature fan sealing structure charging with nitrogen |
| CN109404958A (en) * | 2018-11-12 | 2019-03-01 | 南京博沃科技发展有限公司 | A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue |
| CN209129904U (en) * | 2018-11-28 | 2019-07-19 | 济南风机厂有限责任公司 | The explosion-proof tank body blower of production of aluminum powder line |
| CN110822098A (en) * | 2019-12-13 | 2020-02-21 | 马鞍山钢铁股份有限公司 | Shaft seal failure protection structure and application method thereof |
| CN212003614U (en) * | 2020-04-26 | 2020-11-24 | 刘圣伟 | Solid-liquid pump with better sealing performance |
-
2021
- 2021-07-02 CN CN202110749734.XA patent/CN113606159A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2727508Y (en) * | 2004-08-30 | 2005-09-21 | 邢台钢铁有限责任公司 | Gas fan sealing device |
| CN102878108A (en) * | 2012-09-21 | 2013-01-16 | 西安陕鼓动力股份有限公司 | Inlet air sealing device for axial air feeding type air compressor |
| CN104343721A (en) * | 2013-07-31 | 2015-02-11 | 李玉富 | Fan sealing device |
| CN103850985A (en) * | 2014-03-20 | 2014-06-11 | 合肥通用机械研究院 | Fan adopting shell heat tracing and sealed buffer gas heating |
| CN105927541A (en) * | 2016-05-26 | 2016-09-07 | 无锡联合超滤净化设备科技有限公司 | Blowing or induced draft device for pressurizing combustible and explosive as well as corrosive gases |
| CN206129681U (en) * | 2016-09-30 | 2017-04-26 | 上海德惠特种风机有限公司 | High temperature fan sealing structure charging with nitrogen |
| CN109404958A (en) * | 2018-11-12 | 2019-03-01 | 南京博沃科技发展有限公司 | A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue |
| CN209129904U (en) * | 2018-11-28 | 2019-07-19 | 济南风机厂有限责任公司 | The explosion-proof tank body blower of production of aluminum powder line |
| CN110822098A (en) * | 2019-12-13 | 2020-02-21 | 马鞍山钢铁股份有限公司 | Shaft seal failure protection structure and application method thereof |
| CN212003614U (en) * | 2020-04-26 | 2020-11-24 | 刘圣伟 | Solid-liquid pump with better sealing performance |
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