CN115282543A - Intelligent fire prevention and extinguishing system and method for coal storage silo - Google Patents
Intelligent fire prevention and extinguishing system and method for coal storage silo Download PDFInfo
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- CN115282543A CN115282543A CN202210929125.7A CN202210929125A CN115282543A CN 115282543 A CN115282543 A CN 115282543A CN 202210929125 A CN202210929125 A CN 202210929125A CN 115282543 A CN115282543 A CN 115282543A
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- 239000003245 coal Substances 0.000 title claims abstract description 187
- 238000003860 storage Methods 0.000 title claims abstract description 129
- 230000002265 prevention Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 102
- 238000012806 monitoring device Methods 0.000 claims abstract description 27
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 18
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 42
- 239000007789 gas Substances 0.000 claims description 37
- 238000005507 spraying Methods 0.000 claims description 16
- 239000000779 smoke Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 231100000331 toxic Toxicity 0.000 claims description 4
- 230000002588 toxic effect Effects 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000006864 oxidative decomposition reaction Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 206010000369 Accident Diseases 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/12—Nozzles specially adapted for fire-extinguishing for delivering foam or atomised foam
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
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- Business, Economics & Management (AREA)
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- Chemical & Material Sciences (AREA)
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- General Physics & Mathematics (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
An intelligent fire prevention and extinguishing system for a coal storage silo and a method thereof are provided, the system comprises a monitoring device, a nitrogen gas storage tank and an automatic jet flow fire extinguishing device which are arranged around the coal storage silo, the signal output end of the monitoring device is connected with the signal input end of an intelligent terminal, the intelligent terminal is in bidirectional signal connection with a centralized control center, a pressure sensor is arranged inside the nitrogen gas storage tank, the signal output end of the pressure sensor is connected with the signal input end of the centralized control center, the signal input end of the automatic jet flow fire extinguishing device is connected with the signal output end of the intelligent terminal, and a first pipeline and a second pipeline are arranged inside the coal storage silo; the coal silo has the advantages of realizing multi-level linkage fire prevention and extinguishing and intelligent management of the coal silo, improving safety management of the coal silo, ensuring equipment and personnel safety, and having the characteristics of rapid alarm, simple operation and rapid fire disposal.
Description
Technical Field
The invention relates to the technical field of fire prevention and extinguishment, in particular to an intelligent fire prevention and extinguishment system and method for a coal silo.
Background
At present, after coal of a coal storage silo is spontaneously combusted, the early stage is not easy to perceive, accidents are easy to develop in an enlarged mode, a series of difficulties such as high risk, high fire extinguishing difficulty, incapability of integrally controlling change trend and the like exist in the rescue process, and potential high-risk risks are caused to nearby personnel and equipment.
The existing silo coal temperature monitoring management only utilizes a manual handheld temperature measuring instrument to indirectly know the temperature of stored materials in a silo after the materials are output by a feeder. In the process, while obvious errors exist, the internal structure of the silo cannot be controlled, and the internal structure mainly comprises the conditions of temperature changes of steps, dead-angle coal accumulation areas, coal seams and material surface layers, and has serious management defects of incomplete implementation of silo safety basic measures, backward information acquisition monitoring prevention means and the like. The fire prevention and extinguishing of the silo is based on a single inerting system and an automatic water cannon for prevention and control, and cannot achieve a better effect.
Chinese patent application CN112991660A discloses a silo safety monitoring system, including central controller, monitoring unit and alarm device, electric connection each other between central controller, monitoring unit and the alarm device, still install wireless transceiver sensor on the central controller, detecting element is including video monitoring module and inductor unit. The sensor unit comprises a temperature sensor and a smoke sensor and is used for monitoring the temperature change of the silo and the abnormal smoke condition. The video monitoring module consists of a plurality of high-definition cameras which are uniformly distributed and is used for monitoring the condition of the silo through videos so as to find the fire problem in time. The alarm device is composed of a buzzer, the sound is loud, and the warning effect is obvious. The central controller can also be controlled by the mobile terminal, so that the display condition can be conveniently and timely found. The environment conditions around and inside the silo can be monitored rapidly, dangerous situations can be found conveniently in time, and economic loss and animal and plant safety damage are reduced. However, because fire risks in different degrees, including chronic and sudden, may occur inside the silo, the monitoring system has the disadvantages that only an abnormal risk is found, the abnormal degree cannot be determined, the loop cannot be closed, and furthermore, corresponding measures for handling the dangerous situations in different degrees cannot be performed in a linkage manner.
Chinese patent application CN207137190U discloses a fire-fighting system with fire-proof function for coal silo, which comprises fire-fighting system, coal silo, carbon monoxide detector, temperature detector, smoke detector, high-pressure carbon dioxide fire extinguisher and water curtain fire extinguisher, wherein the carbon monoxide detector, temperature detector, smoke detector, high-pressure carbon dioxide fire extinguisher and water curtain fire extinguisher are all connected with the fire-fighting system. The utility model discloses can prevent the fire accident because silo coal spontaneous combustion brings, newly increase fire extinguishing systems economy and be suitable for, the degree of difficulty of reforming transform engineering is little. However, since the coal is combusted after the temperature of the coal is raised in the early stage of the fire in the silo, the precautionary measure before the combustion is very important, and the application of the patent has the defects that no precautionary measure exists and multi-stage linkage for fire prevention and extinguishment cannot be realized.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an intelligent fire prevention and extinguishing system and method for a coal storage silo.
In order to achieve the purpose, the invention adopts the technical scheme that:
an intelligent fire prevention and extinguishing system for a coal storage silo comprises a monitoring device 1, a nitrogen gas storage tank 4 and an automatic jet fire extinguishing device 9 which are arranged around the coal storage silo, wherein the signal output end of the monitoring device 1 is connected with the signal input end of an intelligent terminal 2, the intelligent terminal 2 is in bidirectional signal connection with a centralized control center 3, a pressure sensor 6 is arranged inside the nitrogen gas storage tank 4, the signal output end of the pressure sensor 6 is connected with the signal input end of the centralized control center 3, the signal input end of the automatic jet fire extinguishing device 9 is connected with the signal output end of the intelligent terminal 2, a first pipeline 7 and a second pipeline 8 are arranged inside the coal storage silo, a plurality of gas outlets communicated with the coal storage silo are formed in the first pipeline 7 and the second pipeline 8, the gas inlet of the first pipeline 7 is connected with the gas outlet of the nitrogen gas storage tank 4 through an inflation valve 10, and the gas inlet of the second pipeline 8 is connected with the gas outlet of the nitrogen gas storage tank 4 through a gas locking valve 11; the centralized control center 3 is in bidirectional signal connection with the coal feeder, and the centralized control center 3 is in bidirectional signal connection with a spraying device arranged above a belt at the bottom of the coal storage silo.
The monitoring device 1 comprises a temperature monitor, a smoke monitor, a gas monitor, an infrared thermal imager and a flame detector.
The PSA nitrogen making system 5 is arranged around the coal storage silo at the same time, and the air outlet of the PSA nitrogen making system 5 is connected with the air inlet of the nitrogen storage tank 4.
At least one first pipeline 7 and at least one second pipeline 8 are arranged inside each coal storage silo, and at least one charging valve 10 and at least one air locking valve 11 are arranged inside each coal storage silo.
The first pipeline 7 and the second pipeline 8 are in an annular point type structure and are annularly layered at the conical bottom of the coal storage silo.
The nitrogen storage tank 4, the PSA nitrogen production system 5, the first pipeline 7, the second pipeline 8, the charging valve 10 and the air locking valve 11 form an inerting system.
The automatic jet fire extinguishing device 9 and the spraying device above the belt at the bottom of the coal storage silo form a fire extinguishing system.
An intelligent fire prevention and extinguishing method for a coal storage silo comprises the following steps:
firstly, parameters of starting a first-level alarm, a second-level alarm and a third-level alarm of a system are set through a centralized control center 3 respectively;
step two, when the system judges that the condition triggers the first-level alarm, the air locking valve 11 is opened, and nitrogen is filled into the coal storage silo through the second pipeline 8, so that the air in the coal storage silo is prevented from flowing backwards; when the system judges that the closing condition is met, the air locking valve 11 is closed according to the time set by the time delay;
when the system judges that the condition triggers the secondary alarm, the air locking valve 11 is opened, nitrogen is filled into the coal storage silo through the second pipeline 8, the air charging valve 10 is opened, the nitrogen is filled into the coal storage silo through the conical region at the middle lower part of the coal bed of the first pipeline 7, oxygen in the coal bed is diluted, the oxidative decomposition of coal is delayed, and the coal is discharged by a coal feeder in a linkage manner; when the system judges that the closing condition is met, the air locking valve 11 is reduced to first-level alarm judgment according to the time set by time delay, the charging valve 10 is closed according to the time set by time delay, and the high-temperature alarm of the coal feeder is closed according to the time set by time delay;
when the system judges that the condition triggers the tertiary alarm, the air-lock valve 11 is opened, the nitrogen is filled into the coal storage silo through the second pipeline 8, the air-charge valve 10 is opened, the nitrogen is filled into the coal storage silo through the conical region of the middle lower part of the coal bed of the first pipeline 7, toxic and combustible gas at the upper part of the coal bed is replaced, the automatic jet fire extinguishing device 9 is opened, the automatic jet fire extinguishing device 9 sprays nitrogen foam according to the condition in the silo, the coal feeder is linked for discharging coal, and the spraying device above the belt at the bottom of the coal storage silo carries out cooling and spraying; when the system judges that the closing condition is met, the air locking valve 11 is lowered to the secondary alarm judgment according to the time set in the time delay mode, the inflation valve 10 is lowered to the secondary alarm judgment according to the time set in the time delay mode, the automatic jet fire extinguishing device 9 is closed in the time delay mode, and the spraying device above the belt at the bottom of the coal storage silo is closed in the time delay mode.
The invention has the technical effects and advantages that:
an intelligent fire prevention and extinguishing system for a coal storage silo and a method thereof technically apply coal feeder linkage, belt linkage, inerting system and fire extinguishing system linkage, achieve all-round consideration for the coal storage silo, apply multi-stage linkage to multi-stage alarm, completely avoid fire of the coal storage silo, and greatly improve the fire prevention and extinguishing system for the coal storage silo.
An intelligent fire prevention and extinguishing system for a coal storage silo is characterized in that a temperature monitor, a smoke monitor, a gas monitor, an infrared thermal imager and a flame detector are arranged in a monitoring device 1, so that gas components in the coal storage silo and the surface temperature of a coal bed can be continuously monitored for 24 hours, risk sources are found in time, and accidents caused by spontaneous combustion of coal are prevented from being expanded; because the signal output end of the monitoring device 1 is connected with the signal input end of the intelligent terminal 2, the intelligent terminal 2 is in bidirectional signal connection with the centralized control center 3, and the signal input end of the automatic jet fire extinguishing device 9 is connected with the signal output end of the intelligent terminal 2, the monitoring device 1 can automatically track and position the automatic jet fire extinguishing device 9 in a protected three-dimensional space range, and carry out omnibearing itinerant scanning on a coal silo, so that a fire source can be found in time and accurately positioned, at the moment, the monitoring device 1 drives the automatic jet fire extinguishing device 9 to quickly and accurately aim a nozzle at the fire source, and the initially-fired fire source can be extinguished instantly, so that the fire source cannot be in a disaster; because the spray set above the belt at the bottom of the coal storage silo can cool the heating coal, the follow-up potential safety hazard can not appear, and the prevention in the bud can be really realized. The safety of equipment and personnel is fundamentally ensured, and the safety benefit is developed to the maximum extent.
The intelligent fire prevention and extinguishing method for the coal storage silo is characterized in that the temperature and the change condition of toxic and harmful gases in each area inside the coal storage silo are remotely monitored in real time on line through a monitoring device 1, an inerting system, a fire extinguishing system and a centralized control center 3 are combined according to actual needs, closed-loop linkage multistage fire prevention and extinguishing measures are realized, the safe production measures are effectively implemented by using an information technical prevention height, the safety management and information acquisition technical level of the coal storage silo can be highly improved, and the intelligent control essential target of the coal storage silo is further achieved.
In conclusion, the invention has the characteristics of high fire prevention and extinguishing efficiency, convenient operation and labor saving.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a system architecture diagram of the present invention.
FIG. 3 is a diagram of a multi-stage linkage method of the present invention.
Wherein: 1. a monitoring device; 2. an intelligent terminal; 3. a centralized control center; 4. a nitrogen gas storage tank; 5. a PSA nitrogen generation system; 6. a pressure sensor; 7. a first pipe; 8. a second conduit; 9. an automatic jet fire extinguishing device; 10. an inflation valve; 11. an air locking valve.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
An intelligent fire prevention and extinguishing system for a coal storage silo comprises a monitoring device 1, a nitrogen gas storage tank 4 and an automatic jet flow fire extinguishing device 9 which are arranged around the coal storage silo, wherein the signal output end of the monitoring device 1 is connected with the signal input end of an intelligent terminal 2, the intelligent terminal 2 is in bidirectional signal connection with a centralized control center 3, a pressure sensor 6 is arranged inside the nitrogen gas storage tank 4, the signal output end of the pressure sensor 6 is connected with the signal input end of the centralized control center 3, the signal input end of the automatic jet flow fire extinguishing device 9 is connected with the signal output end of the intelligent terminal 2, a first pipeline 7 and a second pipeline 8 are arranged inside the coal storage silo, a plurality of gas outlets communicated with the coal storage silo are formed in the first pipeline 7 and the second pipeline 8, the gas inlet of the first pipeline 7 is connected with the gas outlet of the nitrogen gas storage tank 4 through an inflation valve 10, and the gas inlet of the second pipeline 8 is connected with the gas outlet of the nitrogen gas storage tank 4 through a gas locking valve 11; the centralized control center 3 is in bidirectional signal connection with the coal feeder, and the centralized control center 3 is in bidirectional signal connection with a spraying device arranged above a belt at the bottom of the coal storage silo.
The monitoring device 1 is internally provided with a temperature monitor, a smoke monitor, a gas monitor, an infrared thermal imager and a flame detector.
The PSA nitrogen making system 5 is arranged around the coal storage silo at the same time, and the air outlet of the PSA nitrogen making system 5 is connected with the air inlet of the nitrogen storage tank 4.
At least one first pipeline 7 and at least one second pipeline 8 are arranged inside each coal storage silo, and at least one charging valve 10 and at least one air locking valve 11 are arranged inside each coal storage silo.
The first pipeline 7 and the second pipeline 8 are in annular point type structures and are annularly arranged at the conical bottom of the coal storage silo in a layered mode.
The nitrogen gas storage tank 4, the PSA nitrogen making system 5, the first pipeline 7, the second pipeline 8, the charging valve 10 and the air locking valve 11 form an inerting system.
The automatic jet fire extinguishing device 9 and the spraying device above the belt at the bottom of the coal storage silo form a fire extinguishing system.
An intelligent fire prevention and extinguishing method for a coal storage silo comprises the following steps:
firstly, parameters of starting a first-level alarm, a second-level alarm and a third-level alarm of a system are set through a centralized control center 3 respectively;
step two, when the system judges that the condition triggers the first-level alarm, the air locking valve 11 is opened, and nitrogen is filled into the coal storage silo through the second pipeline 8, so that the air in the coal storage silo is prevented from flowing backwards; when the system judges that the closing condition is met, the air locking valve 11 is closed according to the time set by the time delay;
when the system judges that the condition triggers the secondary alarm, the air locking valve 11 is opened, nitrogen is filled into the coal storage silo through the second pipeline 8, the air charging valve 10 is opened, the nitrogen is filled into the coal storage silo through the conical region at the middle lower part of the coal bed of the first pipeline 7, oxygen in the coal bed is diluted, the oxidative decomposition of coal is delayed, and the coal is discharged by a coal feeder in a linkage manner; when the system judges that the closing condition is met, the air locking valve 11 is reduced to first-level alarm judgment according to the time set by time delay, the charging valve 10 is closed according to the time set by time delay, and the high-temperature alarm of the coal feeder is closed according to the time set by time delay;
when the system judges that the condition triggers the tertiary alarm, the air locking valve 11 is opened, nitrogen is filled into the coal storage silo through the second pipeline 8, the air charging valve 10 is opened, the nitrogen is filled into the coal storage silo through the conical region at the middle lower part of the coal bed of the first pipeline 7, toxic and combustible gas at the upper part of the coal bed is replaced, the automatic jet fire extinguishing device 9 is opened, the automatic jet fire extinguishing device 9 sprays nitrogen foam according to the condition in the coal storage silo, the coal feeder is linked for discharging coal, and the spraying device above the belt at the bottom of the coal storage silo performs cooling spraying; when the system judges that the closing condition is met, the air locking valve 11 is lowered to the secondary alarm judgment according to the time set in the time delay mode, the inflation valve 10 is lowered to the secondary alarm judgment according to the time set in the time delay mode, the automatic jet fire extinguishing device 9 is closed in the time delay mode, and the spraying device above the belt at the bottom of the coal storage silo is closed in the time delay mode.
And the first-level alarm is the lowest-level alarm, the inerting system is linked, and nitrogen is filled into the lowest layer of the coal storage silo, so that the temperature of the coal rises slowly.
The second-level alarm is a middle-level alarm, the air locking valve 11 and the air charging valve 10 are opened, nitrogen is charged into the lower layer and the middle layer of the coal storage silo and spread to the whole coal storage silo, the gas in the coal storage silo is inerted, and the temperature rise of the coal is prevented; simultaneously, a coal feeder below the coal storage silo related to the alarm point is linked to discharge the heated coal in the coal storage silo; and the spraying device above the belt at the bottom of the coal storage silo is linked to cool the heating coal.
The third-level alarm is a high-level alarm, and on the basis of the second-level alarm, the automatic jet fire extinguishing device 9 is linked to spray the heating coal in the coal storage silo.
Referring to fig. 1, a temperature monitor, a smoke monitor, a gas monitor, an infrared thermal imager and a flame detector are additionally arranged in a coal storage silo area, a monitoring device 1 collects data and then reaches a server of an electronic room through optical fibers, the data and a PLC control system are integrated to a system platform of a centralized control center 3 for data analysis, and correspondingly sends instructions to an inerting system and an automatic jet fire extinguishing device 9 in the coal storage silo area on site to perform actions of different degrees on abnormal dangerous situations.
As shown in fig. 2, monitoring devices 1 are used for monitoring the operating environment in the coal storage silo, and intelligent terminal 2 is used for collecting various monitoring data of monitoring devices 1, sends data to centralized control center 3, accepts the instruction of centralized control center 3 to move PLC, and can also look over data at the cell-phone end through ripe 4G network. The centralized control center 3 is used for centralized control of the operation of the whole system, including the state and linkage control of the coal feeder. The nitrogen storage tank 4 is used for storing nitrogen and ensuring that enough nitrogen can be supplied to the bin. The PSA nitrogen production system 5 produces high purity (> 97%) nitrogen gas in an inerting protection system. The pressure sensor 6 is used for monitoring the pressure condition of the nitrogen, and the centralized control center 3 can monitor the pressure condition in real time. The arrangement of the first pipeline 7, the second pipeline 8, the charging valve 10 and the air locking valve 11 can be used for charging nitrogen gas by opening different charging valves 10 and air locking valves 11 aiming at different heating degrees of coal. The DCS control center is used for controlling automatic manual switching of the automatic jet fire extinguishing device 9 and debugging the automatic jet fire extinguishing device 9. Aiming at fire accidents possibly occurring in a coal storage silo, the automatic jet fire extinguishing device 9 has the functions of automatic high-pressure water injection, automatic nitrogen foam injection, remote control automatic injection, 360-degree all-directional rotation and remote control of the lifting of a fire monitor in the silo.
As shown in fig. 3, historical data is stored in a professional monitoring database from the field data acquisition to the internet of things platform to the HMI data acquisition server, the state of the coal feeder is linked, the data is subjected to early warning analysis through the centralized control center 3, three levels of alarm thresholds are given through data learning, and processing measures of different degrees are made for the three levels of alarm.
The monitoring device 1 is used for monitoring the temperature, smoke, combustible gas, toxic gas and infrared thermal imager of the coal storage silo in an all-round and multi-aspect manner, on the basis, the monitoring device acts according to a signal fed back by the monitoring device 1, the coal storage silo is automatically locked and filled with the inert gas, and an emergency fire extinguishing measure is taken; by combining the inerting system and the fire extinguishing system, the intelligent control of the coal storage silo is realized, the safety of the coal storage silo and the surrounding environment is protected, and unnecessary loss and influence are avoided.
The input signal is detected by the coal silo, and the inerting system and the fire extinguishing system can be started by the following three signals:
1, first-level alarm signals; (2) a secondary alarm signal; (3) three-level alarm signal
The first-level alarm signal and the second-level alarm signal start the inerting system to prevent coal spontaneous combustion, and the third-level alarm signal starts the fire extinguishing system to prevent fire.
1. Locking gas: when the monitoring device 1 monitors that the coal storage silo generates a primary alarm signal, the coal storage silo locking valve 11 is opened, the coal outlet below the coal storage silo is locked by nitrogen, so that the main component of gas permeating from the coal outlet to a coal storage layer is inert gas, the coal storage silo is continuously sealed and isolated from the outside, and the gas entering the coal storage silo is ensured to be inert gas (an automatic continuous gas locking ring is arranged around the ring-shaped coal outlet).
2. And (3) inflating: when the monitoring device 1 monitors that the coal storage silo generates a three-level alarm signal, the inflation is started. The 'inflation' is a multi-point inflation ring, the first pipeline 7 and the second pipeline 8 are in an annular point structure and are annularly and hierarchically arranged at the conical bottom of the coal storage silo, and the high-rise coal silo has the characteristics of wide range, large pressure, high density and uniform distribution, so that nitrogen is uniformly distributed in a crack of the high-rise coal. The inerting system automatically permeates high-purity nitrogen into the coal bed according to the height of the coal, so that the purposes of reducing the concentration of combustible gas and reducing the temperature of the coal bed are achieved.
3. Automatic tracking and positioning jet flow fire extinguishing: when monitoring that the coal storage silo produces tertiary alarm signal through monitoring devices 1, extinguishing device starts, and automatic efflux extinguishing device 9 moves to in the coal storage silo, through infrared thermal imager and the flame detector that sets up in monitoring devices 1, reaches the effect of fire control fire extinguishing to the accurate injection foam water of fire source.
4. Linkage feeder: more than one coal feeder is arranged below the coal storage silo, each coal feeder is provided with a corresponding measuring point, and after an alarm occurs at the corresponding measuring point, the coal feeder can act to lower high-temperature coal near the coal feeder and convey the coal away through a belt below the coal storage silo.
5. Belt spraying device: every belt top of coal storage silo bottom corresponds there is spray set, has the coal of generating heat to emit from coal storage silo in when a belt, and the cooling on this belt sprays and will start the linkage, carries out cooling treatment to the coal of generating heat, guarantees follow-up potential safety hazard that can not appear.
Claims (6)
1. An intelligent fire prevention and extinguishing system for a coal storage silo is characterized by comprising a monitoring device (1), a nitrogen gas storage tank (4) and an automatic jet fire extinguishing device (9) which are arranged around the coal storage silo, wherein the signal output end of the monitoring device (1) is connected with the signal input end of an intelligent terminal (2), the intelligent terminal (2) is in bidirectional signal connection with a centralized control center (3), a pressure sensor (6) is arranged inside the nitrogen gas storage tank (4), the signal output end of the pressure sensor (6) is connected with the signal input end of the centralized control center (3), the signal input end of the automatic jet fire extinguishing device (9) is connected with the signal output end of the intelligent terminal (2), a first pipeline (7) and a second pipeline (8) are arranged inside the coal storage silo, a plurality of gas outlets communicated with the coal storage silo are formed in the first pipeline (7) and the second pipeline (8), the gas inlet of the first pipeline (7) is connected with the gas outlet of the nitrogen gas storage tank (4) through a gas charging valve (10), and the gas inlet of the second pipeline (8) is connected with the gas outlet of the nitrogen gas storage tank (4) through a gas locking valve (11); the centralized control center (3) is in bidirectional signal connection with the coal feeder, and the centralized control center (3) is in bidirectional signal connection with a spraying device arranged above a belt at the bottom of the coal storage silo.
2. The intelligent fire prevention and extinguishing system for a coal storage silo according to claim 1, characterized in that the monitoring device (1) comprises a temperature monitor, a smoke monitor, a gas monitor, an infrared thermal imager and a flame detector.
3. The intelligent fire prevention and extinguishing system for the coal storage silo as claimed in claim 1, wherein a PSA nitrogen production system (5) is arranged around the coal storage silo, and an air outlet of the PSA nitrogen production system (5) is connected with an air inlet of the nitrogen storage tank (4).
4. An intelligent fire prevention and extinguishing system for coal storage silos according to claim 1, wherein at least one first pipeline (7) and at least one second pipeline (8) are arranged inside each coal storage silo, and at least one charging valve (10) and at least one gas locking valve (11) are arranged inside each coal storage silo.
5. The intelligent fire prevention and extinguishing system for the coal storage silo according to claim 1, wherein the first pipeline (7) and the second pipeline (8) are of an annular point structure and are annularly layered at the conical bottom of the coal storage silo.
6. The fire prevention and extinguishing method based on the intelligent fire prevention and extinguishing system for the coal silo as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:
firstly, setting parameters of starting a primary alarm, a secondary alarm and a tertiary alarm of a system through a centralized control center (3) respectively;
step two, when the system judgment condition triggers a primary alarm, the air locking valve (11) is opened, and nitrogen is filled into the coal storage silo through the second pipeline (8), so that air backflow in the coal storage silo is prevented; when the system judges that the closing condition is met, the air locking valve (11) is closed according to the time set by the delay;
when the system judges that the condition triggers the secondary alarm, the air locking valve (11) is opened, nitrogen is filled into the coal storage silo through the second pipeline (8), the air charging valve (10) is opened, the nitrogen is filled into the coal storage silo through the conical region at the middle lower part of the coal bed of the first pipeline (7), oxygen in the coal bed is diluted, the oxidative decomposition of coal is delayed, and the coal is discharged by a coal feeder in a linkage manner; when the system judges that the closing condition is met, the air locking valve (11) is reduced to first-level alarm judgment according to the time set by delay, the air charging valve (10) is closed according to the time set by delay, and the high-temperature alarm of the coal feeder is closed according to the time set by delay;
when the system judges that the condition triggers the tertiary alarm, the air locking valve (11) is opened, nitrogen is filled into the coal storage silo through the second pipeline (8), the inflation valve (10) is opened, the nitrogen is filled into the coal storage silo through the conical region at the middle lower part of the coal bed of the first pipeline (7), toxic and combustible gas at the upper part of the coal bed is replaced, the automatic jet flow fire extinguishing device (9) is opened, the automatic jet flow fire extinguishing device (9) sprays nitrogen foam according to the condition in the silo, the coal feeder is linked to discharge coal, and the spraying device above a belt at the bottom of the coal storage silo carries out cooling spraying; when the system judges that the closing condition is met, the air locking valve (11) is reduced to the second-stage alarm judgment according to the time set by the time delay, the air charging valve (10) is reduced to the second-stage alarm judgment according to the time set by the time delay, the automatic jet fire extinguishing device (9) is closed at the time set by the time delay, and the spraying device above the belt at the bottom of the coal storage silo is closed at the time set by the time delay.
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Application publication date: 20221104 |