CN214388579U - Control system for CO automatic detection - Google Patents
Control system for CO automatic detection Download PDFInfo
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- CN214388579U CN214388579U CN202022898032.1U CN202022898032U CN214388579U CN 214388579 U CN214388579 U CN 214388579U CN 202022898032 U CN202022898032 U CN 202022898032U CN 214388579 U CN214388579 U CN 214388579U
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 239000003245 coal Substances 0.000 claims abstract description 147
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000011261 inert gas Substances 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000002817 coal dust Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 12
- 230000002269 spontaneous effect Effects 0.000 abstract description 7
- 238000011897 real-time detection Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The application relates to a control system for automatic CO detection, which belongs to the technical field of gas detection and comprises a pulverized coal bunker, a CO detection module arranged inside the top of the pulverized coal bunker, and a pulverized coal conveying channel arranged at the bottom of the pulverized coal bunker, wherein a discharge valve is arranged on the pulverized coal conveying channel, a pulverized coal discharging mechanism for powder falling and emergency powder discharge is arranged at the bottom of the pulverized coal bunker, and a top fire extinguishing mechanism is arranged at the top of the pulverized coal bunker; the CO detection module, the pulverized coal discharge mechanism and the top fire extinguishing mechanism are all electrically connected with a central control module positioned outside the pulverized coal bin. The coal powder bin of the pulverized coal boiler can be subjected to real-time detection on the content of CO in the coal powder bin, and the pulverized coal discharging mechanism and the top fire extinguishing mechanism can be selectively started after the content of CO exceeds a preset value, so that safety accidents caused by spontaneous combustion of pulverized coal in the coal powder bin or overhigh concentration of CO are avoided, and the safe operation of the pulverized coal boiler is guaranteed.
Description
Technical Field
The application relates to the field of gas detection, in particular to a control system for automatic CO detection.
Background
The pulverized coal boiler is an industrial coal-fired heating device with high combustion rate, environmental protection and energy saving, and is widely applied to the fields of power plants, chemical plants and the like. The existing pulverized coal boiler comprises a boiler body, a pulverized coal bin and a bag-type dust collector, wherein the pulverized coal bin is provided with a discharge hole and a discharge hole, the boiler body is provided with a feeding hole and an air outlet, the discharge hole of the pulverized coal bin is communicated with the feeding hole of the boiler body through a communicating pipe, and the air outlet of the boiler body is communicated with the bag-type dust collector through a ventilating pipe. When the boiler works, proper coal is dried and ground to form coal powder, the coal powder is pumped into the fuel bins in a tank car or bin pump pneumatic conveying mode, a coal powder bin is arranged in front of each boiler room, and the coal powder bins deliver the coal powder to the hearth for combustion through a feeding system.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: because a large amount of coal dust is accumulated in the coal dust bin, the coal dust bin is easy to spontaneously combust after a certain time, and has potential safety hazard.
SUMMERY OF THE UTILITY MODEL
In order to detect the spontaneous combustion condition of the pulverized coal in the pulverized coal bin in real time and react according to the detection result, and the occurrence of safety accidents is reduced, the application provides a control system for automatic CO detection.
The control system for CO automatic detection provided by the application adopts the following technical scheme:
a control system for automatic CO detection comprises a pulverized coal bunker, a CO detection module arranged in the top of the pulverized coal bunker, and a pulverized coal conveying channel arranged at the bottom of the pulverized coal bunker, wherein a discharge valve is arranged on the pulverized coal conveying channel, a pulverized coal discharging mechanism for reducing and discharging powder in an emergency manner is arranged at the bottom of the pulverized coal bunker, and a top fire extinguishing mechanism is arranged at the top of the pulverized coal bunker; and the CO detection module, the pulverized coal discharge mechanism and the top fire extinguishing mechanism are all electrically connected with a central control module positioned outside the pulverized coal bin.
By adopting the technical scheme, in the working process of the pulverized coal boiler, the CO concentration in the pulverized coal bin is detected in real time by utilizing the CO detection module fixed in the pulverized coal bin, a control program is preset in the central control module, and when the CO concentration is detected to exceed the lowest dangerous value, the top fire extinguishing mechanism is opened to reduce the CO concentration; when the CO concentration is detected to reach the spontaneous combustion value of the pulverized coal, the pulverized coal discharging mechanism at the bottom is started to discharge the pulverized coal, and when the CO concentration is lower than the safety value of the CO, the pulverized coal discharging mechanism and the fire extinguishing mechanism are stopped, so that the CO concentration can be reduced while the CO in the pulverized coal bin is automatically detected, the safety of the pulverized coal bin is ensured, and the occurrence of fire or explosion accidents is avoided.
Preferably, the top fire extinguishing mechanism comprises an inert gas nozzle fixed at the top of the pulverized coal bin, the inert gas nozzle is communicated with a gas storage tank located outside the pulverized coal bin through a vent pipe, and the vent pipe is provided with a control valve which is electrically connected with the central control module.
By adopting the technical scheme, inert gas is flushed into the pulverized coal bunker, so that the concentration of CO is reduced.
Preferably, the inert gas shower head is provided in plurality.
By adopting the technical scheme, the inert gas is rapidly and uniformly distributed in the pulverized coal bunker.
Preferably, the pulverized coal discharging mechanism comprises a discharging pipeline which is arranged below the pulverized coal bin and is obliquely arranged, the discharging pipeline is communicated with the pulverized coal bin through a pipeline, a discharging valve is arranged on the pipeline between the discharging pipeline and the pulverized coal bin, and the discharging valve is electrically connected with the central control module.
Through adopting above-mentioned technical scheme, the opening of control module control relief valve can decide whether to open the outside row of relief valve according to the CO concentration value that CO detection module surveyed.
Preferably, a spiral shaft is arranged in the material discharging pipeline along the length direction of the material discharging pipeline, and the spiral shaft is driven by a driving motor; the driving motor is electrically connected with the central control module.
By adopting the technical scheme, the driving motor and the screw shaft are utilized to control the discharging speed.
Preferably, the CO detection module is positioned in a detection box fixed at the top of the pulverized coal bin, and the bottom surface of the detection box is a filter plate for filtering pulverized coal.
By adopting the technical scheme, the CO detection module is protected, and a gas sampling area in the detection box is formed.
Preferably, a cleaning brush for cleaning attached coal dust is arranged on the bottom surface of the filter plate, the cleaning brush is driven by a micro motor arranged in the detection box, and the micro motor is electrically connected with the central control module.
Through adopting above-mentioned technical scheme, the cleaning brush cleans the buggy that adheres to on the filter, avoids the space on the buggy jam filter to cause the testing result inaccurate.
Preferably, an induced draft fan communicated with the pulverized coal bunker is arranged at the top of the pulverized coal bunker, an induced draft valve is arranged on the induced draft fan, and the induced draft valve is electrically connected with the central control module; the position of the pulverized coal bunker top, far away from the draught fan, is provided with an air supplementing pipeline communicated with the pulverized coal bunker, an air supplementing valve is arranged on the air supplementing pipeline, and the air supplementing valve is electrically connected with the central control module.
By adopting the technical scheme, when the CO concentration exceeds a safe value, the induced draft valve can be opened and the induced draft fan can be started to discharge CO out of the pulverized coal bunker, so that the CO concentration in the pulverized coal bunker is reduced.
In summary, the present application includes at least one of the following beneficial technical effects: by arranging the pulverized coal discharging mechanism, the top fire extinguishing mechanism and the induced draft fan, when the CO concentration in the pulverized coal bin reaches a lower dangerous value, the induced draft valve is opened, the induced draft fan is started to exhaust the air to the outside, and the control valve is opened to inject inert gas into the pulverized coal bin, so that the CO concentration is reduced; when the concentration reaches the condition that the spontaneous combustion of the pulverized coal is considered to occur, the pulverized coal discharge mechanism is started to discharge materials to the outside of the pulverized coal bin, the discharge valve is closed when the concentration is reduced to be lower than the spontaneous combustion value, the induced draft fan and the top fire extinguishing mechanism continue to work at the moment until the concentration of CO in the pulverized coal bin is lower than the minimum dangerous value, the induced draft fan and the induced draft valve are closed, and the control valve is closed; therefore, early treatment can be performed when the CO concentration in the pulverized coal bin is too high or pulverized coal is self-combusted, explosion or pulverized coal continuous combustion in the pulverized coal bin is avoided, and safe operation of the pulverized coal boiler is guaranteed.
Drawings
Fig. 1 is a schematic overall configuration diagram of a control system for automatic CO detection according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a top fire extinguishing mechanism of a control system for automatic CO detection according to an embodiment of the present application.
Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a schematic bottom structure diagram of a pulverized coal bunker of a control system for automatic CO detection according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a pulverized coal discharge mechanism of a control system for automatic CO detection according to an embodiment of the present application.
Description of reference numerals: 1. a pulverized coal bunker; 11. a pulverized coal discharge mechanism; 111. a discharge valve; 112. a screw shaft; 113. a drive motor; 114. a discharge conduit; 12. a pulverized coal conveying passage; 121. a discharge valve; 13. an air supply pipeline; 131. an air supplement valve; 14. an induced draft fan; 141. an induced draft valve; 2. a central control module; 3. a CO detection module; 4. a detection cartridge; 41. a filter plate; 42. a cleaning brush; 5. a top fire suppression mechanism; 51. an inert gas showerhead; 52. a control valve; 53. an air duct; 54. an air storage tank.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a control system for automatic detection of CO.
CO, as a combustible gas, is one of the gases of major interest in pulverized coal boilers. The CO concentration is generally used as a signal to detect whether the coal fines are natural or not. The direct source of CO in the coal dust bin is incomplete combustion of the coal dust, and in addition, low-temperature oxidation of the coal dust in the bin and introduction of heat sources delivered to the coal mill are also reasons for the increase in CO concentration.
Referring to fig. 1 and 2, the control system for automatic CO detection includes a coal powder bin 1, a CO detection module 3, a coal powder discharge mechanism 11, a coal powder conveying channel 12, a central control module 2 controlled by a PLC program, and a top fire extinguishing mechanism 5.
The bottom of the coal powder bin 1 is fixedly provided with a coal powder conveying channel 12 which is communicated with the coal powder bin 1 and extends downwards, and the bottom end of the coal powder conveying channel 12 is connected with a coal powder conveying mechanism (not shown in the figure). The pulverized coal conveying channel 12 is provided with a discharge valve 121. The discharge valve 121 is mainly used for controlling the discharge amount of the pulverized coal. The discharge valve 121 is electrically connected with the central control module 2.
Referring to fig. 1 and 4, the pulverized coal discharging mechanism 11 is located at the bottom of the pulverized coal bunker 1. The pulverized coal discharging mechanism 11 includes a discharging duct 114 disposed obliquely below the pulverized coal bunker 1. The discharging pipeline 114 is communicated with the pulverized coal bunker 1 by a vertical pipeline. The conduit communicates with the discharge conduit 114 proximate the upper portion of the discharge conduit 114. The conduit is provided with a discharge valve 111. The discharge valve 111 is electrically connected to the central control module 2. The pulverized coal discharging mechanism 11 can drop and discharge the pulverized coal in the pulverized coal bunker 1 in an emergency manner under the condition that the normal conveying of the pulverized coal into the boiler is not influenced.
The inner surface of the communication part of the pipeline and the coal powder bin 1 is an inclined surface which inclines towards the coal powder conveying channel 12. Under normal conditions, bleeder valve 121 opens, and blow-off valve 111 closes, and the intercommunication department of buggy storehouse 1 and pipeline sets to the inclined plane can effectively avoid the in-process buggy of unloading to be detained for a long time in buggy storehouse 1 and can't get into buggy transfer passage 12.
Referring to fig. 4 and 5, a screw shaft 112 is disposed in the discharge duct 114 along the length of the discharge duct 114. The screw shaft 112 is rotatably coupled to a side plate at one end of the discharge duct 114 having a large height in a longitudinal direction. The screw shaft 112 is rotated by a driving motor 113 fixed to an outer side of the discharge duct 114. The driving motor 113 is electrically connected to the center control module 2.
Referring to fig. 2 and 3, an air supply pipeline 13 communicated with the interior of the pulverized coal bunker 1 is fixedly arranged on the top surface of the pulverized coal bunker 1. An air supplement valve 131 is arranged on the air supplement pipeline 13. And an induced draft fan 14 fixedly connected to the pulverized coal bunker 1 is arranged on the top surface of the pulverized coal bunker 1 far away from the air supplementing pipeline 13. The induced draft fan 14 is communicated with the interior of the pulverized coal bunker 1. An air outlet of the induced draft fan 14 is provided with an induced draft valve 141. The induced draft fan 14, the air supplement valve 131 and the induced draft valve 141 are all electrically connected with the central control module 2.
The CO detection module 3 is arranged in a detection box 4 fixed on the bottom surface of the top plate of the pulverized coal bunker 1. The bottom plate of the cartridge 4 is a filter plate 41 capable of filtering out pulverized coal and allowing gas to pass therethrough. The filter plate 41 separates the pulverized coal space from the internal space of the detection box 4, and prevents pulverized coal from damaging the CO detection module 3. The inside of the cartridge 4 forms a gas sampling area. The CO detection module 3 may be a CO concentration sensor. The CO detection module 3 is electrically connected with the central control module 2.
A cleaning brush 42 is rotatably connected to the bottom surface of the filter plate 41, and a micro motor (a fixing structure of the micro motor is not shown) for driving the cleaning brush 42 to rotate is fixedly arranged inside the detection box 4. The micro motor is electrically connected with the central control module 2. Under the drive of the micro motor, the cleaning brush 42 cleans the coal dust attached to the filter plate 41, and the situation that the coal dust blocks the gap on the filter plate 41 to cause inaccurate detection results is avoided. The CO detection module 3 can be arranged on the top plate of the pulverized coal bunker 1 at intervals, so that the accuracy of the detection result is ensured.
Referring to fig. 1 and 2, the top fire extinguishing mechanism 5 includes an inert gas nozzle 51 located on the inner wall of the pulverized coal bunker 1 near the ceiling of the pulverized coal bunker 1. The inert gas nozzles 51 are provided in plurality at equal intervals in the circumferential direction of the pulverized coal bunker 1. An annular pipe surrounding the pulverized coal bunker 1 is fixedly arranged at a position opposite to the inert gas nozzle 51 outside the pulverized coal bunker 1. The annular pipe communicates with the inert gas shower head 51. The annular pipe is connected to an inert gas tank 54 located outside the pulverized coal bunker 1 through a ventilation pipe 53. The control valve 52 is provided on the vent pipe 53. The control valve 52 is electrically connected to the center control module 2.
The implementation principle of the control system for automatic detection of CO in the embodiment of the application is as follows: when the CO concentration in the pulverized coal bunker 1 reaches a lower dangerous value, the induced draft valve 141 is opened, the induced draft fan 14 is started to exhaust air to the outside, and the control valve 52 is opened to inject inert gas into the pulverized coal bunker 1, so that the CO concentration is reduced; when the CO concentration reaches the condition that pulverized coal spontaneous combustion is considered to occur, the pulverized coal discharging mechanism 11 is started to discharge materials to the outside of the pulverized coal bunker 1, until the CO concentration is reduced to be lower than the spontaneous combustion value, the discharging valve 111 is closed, the induced draft fan 14 and the top fire extinguishing mechanism 5 continue to work at the moment, until the CO concentration in the pulverized coal bunker 1 is lower than the lowest dangerous value, the induced draft fan 14 and the induced draft valve 141 are closed, and the control valve 52 is closed.
The control system for CO automatic detection can make early treatment when the CO concentration in the pulverized coal bunker 1 is too high or pulverized coal is spontaneously combusted, so that explosion or pulverized coal continuous combustion in the pulverized coal bunker 1 is avoided, and the safe operation of a pulverized coal boiler is guaranteed.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a CO automated inspection's control system, includes buggy storehouse (1), sets up at inside CO detection module (3) of buggy storehouse (1) cang ding, sets up buggy transfer passage (12) in buggy storehouse (1) bottom, be provided with bleeder valve (121), its characterized in that on buggy transfer passage (12): a pulverized coal discharging mechanism (11) for reducing and discharging powder and emergency powder is arranged at the bottom of the pulverized coal bin (1), and a top fire extinguishing mechanism (5) is arranged at the top of the pulverized coal bin (1); and the CO detection module (3), the pulverized coal discharge mechanism (11) and the top fire extinguishing mechanism (5) are all electrically connected with a central control module (2) positioned outside the pulverized coal bin (1).
2. The control system for automatic detection of CO according to claim 1, wherein: the top fire extinguishing mechanism (5) comprises an inert gas nozzle (51) fixed to the top of the pulverized coal bin (1), the inert gas nozzle (51) is communicated with a gas storage tank (54) located outside the pulverized coal bin (1) through a ventilation pipeline (53), a control valve (52) is arranged on the ventilation pipeline (53), and the control valve (52) is electrically connected with the central control module (2).
3. The control system for automatic CO detection according to claim 2, wherein: the inert gas nozzles (51) are provided in plurality.
4. The control system for automatic detection of CO according to claim 1, wherein: buggy discharge mechanism (11) is including row's material pipeline (114) that is located buggy storehouse (1) below and slope setting, row's material pipeline (114) and buggy storehouse (1) are through the pipeline intercommunication, be provided with on the pipeline between row's material pipeline (114) and buggy storehouse (1) and arrange material valve (111), arrange material valve (111) and well accuse module (2) electricity and be connected.
5. The control system for CO automatic detection according to claim 4, characterized in that: a screw shaft (112) is arranged in the discharging pipeline (114) along the length direction of the discharging pipeline (114), and the screw shaft (112) is driven by a driving motor (113); the driving motor (113) is electrically connected with the central control module (2).
6. The control system for automatic detection of CO according to claim 1, wherein: the CO detection module (3) is positioned in a detection box (4) fixed at the top of the pulverized coal bin (1), and the bottom surface of the detection box (4) is a filter plate (41) for filtering pulverized coal.
7. The control system for CO automatic detection according to claim 6, characterized in that: the coal dust cleaning device is characterized in that a cleaning brush (42) for cleaning attached coal dust is arranged on the bottom surface of the filter plate (41), the cleaning brush (42) is driven by a micro motor arranged in the detection box (4), and the micro motor is electrically connected with the central control module (2).
8. The control system for automatic detection of CO according to claim 1, wherein: an induced draft fan (14) communicated with the pulverized coal bunker (1) is arranged at the top of the pulverized coal bunker (1), an induced draft valve (141) is arranged on the induced draft fan (14), and the induced draft valve (141) is electrically connected with the central control module (2); the pulverized coal bunker is characterized in that an air supplementing pipeline (13) communicated with the pulverized coal bunker (1) is arranged at the position, far away from a draught fan (14), of the top of the pulverized coal bunker (1), an air supplementing valve (131) is arranged on the air supplementing pipeline (13), and the air supplementing valve (131) is electrically connected with the central control module (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022898032.1U CN214388579U (en) | 2020-12-03 | 2020-12-03 | Control system for CO automatic detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022898032.1U CN214388579U (en) | 2020-12-03 | 2020-12-03 | Control system for CO automatic detection |
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| Publication Number | Publication Date |
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| CN214388579U true CN214388579U (en) | 2021-10-15 |
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| CN202022898032.1U Active CN214388579U (en) | 2020-12-03 | 2020-12-03 | Control system for CO automatic detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115645780A (en) * | 2022-09-16 | 2023-01-31 | 华中科技大学 | Pulverized coal bunker explosion-proof combustion-inhibiting system of deep peak shaving coal-fired boiler |
-
2020
- 2020-12-03 CN CN202022898032.1U patent/CN214388579U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115645780A (en) * | 2022-09-16 | 2023-01-31 | 华中科技大学 | Pulverized coal bunker explosion-proof combustion-inhibiting system of deep peak shaving coal-fired boiler |
| CN115645780B (en) * | 2022-09-16 | 2023-12-12 | 华中科技大学 | Coal powder bin explosion-proof combustion suppression system of deep peak regulation coal-fired boiler |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: HUANENG POWER INT Inc. RIZHAO POWER PLANT Assignor: HUANENG SHANDONG POWER GENERATION Co.,Ltd. Contract record no.: X2023980053319 Denomination of utility model: A Control System for CO Automatic Detection Granted publication date: 20211015 License type: Common License Record date: 20231220 |
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| EE01 | Entry into force of recordation of patent licensing contract |