CN112870589B - Method and system for extinguishing fire and reducing temperature by using active carbon on vibrating screen - Google Patents
Method and system for extinguishing fire and reducing temperature by using active carbon on vibrating screen Download PDFInfo
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- CN112870589B CN112870589B CN202110045116.7A CN202110045116A CN112870589B CN 112870589 B CN112870589 B CN 112870589B CN 202110045116 A CN202110045116 A CN 202110045116A CN 112870589 B CN112870589 B CN 112870589B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 371
- 238000000034 method Methods 0.000 title claims abstract description 105
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 64
- 238000001931 thermography Methods 0.000 claims abstract description 232
- 238000001816 cooling Methods 0.000 claims abstract description 149
- 239000000463 material Substances 0.000 claims abstract description 148
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- 239000000498 cooling water Substances 0.000 claims description 171
- 238000005507 spraying Methods 0.000 claims description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 22
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
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- 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 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- A62C31/005—Delivery of fire-extinguishing material using nozzles
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0072—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using sprayed or atomised water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/05—Means for preventing contamination of the components of the optical system; Means for preventing obstruction of the radiation path
- G01J5/051—Means for preventing contamination of the components of the optical system; Means for preventing obstruction of the radiation path using a gas purge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
- G01J5/061—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity by controlling the temperature of the apparatus or parts thereof, e.g. using cooling means or thermostats
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
- G01J2005/065—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity by shielding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Emergency Management (AREA)
- Radiation Pyrometers (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
A method for extinguishing fire and reducing temperature by active carbon on a vibrating screen comprises the following steps: 1) the thermal imaging instrument (1) shoots materials entering the tail imaging area (3) of the vibrating screen (2) in real time to obtain a thermal imaging image; 2) analyzing and judging whether the material entering the imaging area (3) has a high temperature point or not according to the thermal imaging image; 2a) if the thermal imaging image does not have the high temperature point, repeating the step 1); 2b) if the thermal imaging image is judged to have a high temperature point, the material at the high temperature point is subjected to fire extinguishing and cooling treatment through a spontaneous combustion activated carbon extinguishing cooling device arranged at the tail part of the vibrating screen (2). According to the invention, the spontaneous combustion high-temperature activated carbon is detected in the falling state of the activated carbon particles at the tail part of the vibrating screen, and can be processed in time, so that the problem that the high-temperature activated carbon particles are difficult to detect and dispose comprehensively is solved, and the safety of the system is improved.
Description
Technical Field
The invention relates to detection and treatment of high-temperature active carbon particles in an active carbon flue gas purification device, in particular to a method and a system for extinguishing and cooling active carbon on a vibrating screen, and belongs to the technical field of active carbon flue gas purification.
Background
The amount of flue gas generated in the sintering process accounts for about 70 percent of the total flow of steel, and the main pollutant components in the sintering flue gas are dust and SO 2 、NO X (ii) a In addition, a small amount of VOCs, dioxin, heavy metals and the like are also added; the waste water can be discharged after purification treatment. At present, the technology of treating sintering flue gas by using an activated carbon desulfurization and denitrification device is mature, and the activated carbon desulfurization and denitrification device is popularized and used in China, so that a good effect is achieved.
The working schematic diagram of the activated carbon desulfurization and denitrification device in the prior art is shown in fig. 1: raw flue gas (main component of pollutant is SO) generated in sintering process 2 ) The flue gas is discharged as clean flue gas after passing through an active carbon bed layer of the adsorption tower; adsorbing pollutants (the main component of the pollutants is SO) in the flue gas 2 ) The activated carbon is sent into an analysis tower through an activated carbon conveyor S1, the activated carbon adsorbed with pollutants in the analysis tower is heated to 400-430 ℃ for analysis and activation, SRG (sulfur-rich) gas released after the analysis and activation is subjected to an acid making process, the activated carbon after the analysis and activation is cooled to 110-130 ℃ and then discharged out of the analysis tower, activated carbon dust is screened out by a vibrating screen, and the activated carbon particles on the screen reenter the adsorption tower through an activated carbon conveyor S2; fresh activated carbon is supplied to the conveyor S1 (activated carbon used in the flue gas purification apparatus is cylindrical activated carbon granules having typical sizes: 9mm in diameter and 11mm in height).
As shown in figure 1, the activated carbon is heated to 400-430 ℃ in the desorption tower, and the burning point temperature of the activated carbon used by the activated carbon flue gas purification device is 420 ℃; the desorption column was of a gas-tight construction and was filled with nitrogen.
The schematic structure of the prior art desorption tower is shown in fig. 2: the active carbon is not contacted with air in the desorption tower so as to ensure that the active carbon is not burnt in the desorption tower; in the process of heating and cooling the activated carbon in the desorption tower, occasionally, a small amount of heated activated carbon particles are not sufficiently cooled in the cooling section, and a small amount of high-temperature activated carbon particles which are not cooled to a safe temperature are discharged from the desorption tower (the amount of activated carbon particles filled in the desorption tower of the sintering flue gas purification device exceeds hundreds of tons, and the processes of flowing, cooling, heating, heat conduction and the like of the activated carbon particles in the desorption tower are complicated). High temperature activated carbon particle is from analytic tower discharge back and air contact, spontaneous combustion (smoldering, flameless) can take place, the low temperature activated carbon particle around it can be ignited to a small amount of high temperature activated carbon particle of spontaneous combustion, the high temperature activated carbon particle of these spontaneous combustion can follow the activated carbon circulation and get into each link of gas cleaning device, threaten the safe and stable operation of sintering activated carbon flue gas purification system, sintering activated carbon flue gas purification device has the requirement that detects and deal with high temperature spontaneous combustion activated carbon particle. As shown in fig. 1, the sintered activated carbon flue gas purification device circulates between the desorption tower and the adsorption tower, and all links such as the desorption tower, the adsorption tower, the conveyor, the vibrating screen, the buffer bin and the like are all of airtight structures.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for extinguishing fire and reducing temperature by using active carbon on a vibrating screen. According to the invention, the thermal imager is arranged above the cover plate at the tail part of the vibrating screen of the activated carbon flue gas purification device, the thermal imager shoots materials entering an imaging area to obtain thermal imaging images, and then analyzes and judges whether the materials have high temperature points, and then the spontaneous combustion activated carbon extinguishing cooling device arranged at the tail part of the vibrating screen is used for extinguishing and cooling the materials at the corresponding high temperature points. According to the technical scheme provided by the invention, the spontaneous combustion or high-temperature activated carbon is detected at the falling section of the tail part of the vibrating screen of the activated carbon flue gas purification device, and can be positioned and processed in time, so that the problem that high-temperature activated carbon particles are difficult to detect and treat comprehensively is solved, and the safety of the system is improved.
According to a first embodiment of the invention, a method for extinguishing fire and reducing temperature by using activated carbon on a vibrating screen is provided.
A method for extinguishing fire and reducing temperature by active carbon on a vibrating screen comprises the following steps:
1) the thermal imaging instrument shoots the material entering the imaging area at the tail part of the vibrating screen in real time to obtain a thermal imaging image;
2) analyzing and judging whether the material entering the imaging area has a high temperature point or not according to the thermal imaging image;
2a) if the thermal imaging image does not have the high temperature point, repeating the step 1);
2b) and if the thermal imaging image is judged to have a high temperature point, extinguishing and cooling the material at the high temperature point through an autoignition activated carbon extinguishing and cooling device arranged at the tail part of the vibrating screen.
In the invention, the spontaneous combustion activated carbon extinguishing cooling device is a fire extinguishing gas blowing device. The fire extinguishing gas blowing device is arranged on an end plate at the tail part of the vibrating screen. The fire extinguishing gas blowing device is provided with a fire extinguishing gas valve.
Preferably, in step 2b), when it is judged that the thermographic image has a high temperature point, the current time t0 is recorded. Starting from the moment t0, opening a fire extinguishing gas valve of the fire extinguishing gas blowing device, and blowing the fire extinguishing gas to the corresponding high-temperature material by the fire extinguishing gas blowing device. After the fire extinguishing gas is sprayed by the fire extinguishing gas spraying and blowing device for the duration time t1, the fire extinguishing gas valve is closed, and the high-temperature material achieves the effect of extinguishing and cooling. Wherein the duration t1 of the fire extinguishing gas blowing by the fire extinguishing gas blowing device satisfies the following relational expression:
wherein: t1 is the duration, s, of the fire extinguishing gas blown by the fire extinguishing gas blowing device. C h The specific heat capacity of the activated carbon is kJ/(kg-DEG C). M h Kg is the amount of activated carbon to be cooled. Δ t h Is the target of active carbon temperature reduction. C n kJ/(kg. DEG C.) is the specific heat capacity of the fire extinguishing gas. Rho n Density of extinguishing gas, kg/m 3 。Δt n The temperature of the fire extinguishing gas is increased after the fire extinguishing gas is extinguished and cooled. S 1 Cross-sectional area of the orifice, m, of the extinguishing gas blowing means 2 。v 1 The flow velocity of the fire extinguishing gas sprayed by the fire extinguishing gas spraying and blowing device is m/s. k is a radical of formula 1 For safety systemsThe number is 1.5-2.
In the invention, the vibrating screen is provided with the cover plate, and the material entering the vibrating screen moves along the length direction of the vibrating screen. Preferably, the imaging region includes a first imaging region and a second imaging region. At the end of the shaker, the first imaging zone is located upstream of the second imaging zone.
In step 1), the thermal imager shoots the material that gets into in the shale shaker tail portion imaging area in real time, obtains the thermal imaging image, specifically is:
1a) a light shield is arranged on a cover plate at the tail part of the vibrating screen, and a thermal imager is arranged at the top of the light shield;
1b) the connecting position of the thermal imaging camera and the light shield is taken as a base point, and the thermal imaging camera performs reciprocating swing around the base point. The thermal imaging instrument shoots materials entering a first imaging area and/or a second imaging area at the tail part of the vibrating screen in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image.
In the invention, in step 2), whether the material entering the imaging area has a high temperature point is judged according to the thermal imaging image analysis, specifically:
the thermal imaging instrument shoots the material entering the first imaging area at the tail part of the vibrating screen in real time to obtain a primary thermal imaging image. The maximum temperature value T1 in the primary thermographic image is acquired and compared with the set target temperature T0 by the maximum temperature value T1. And if T1 is not more than T0, judging that the primary thermal imaging image does not have a high temperature point, and repeating the step 1). If T1 is larger than T0, the primary thermal imaging image is judged to have suspected high-temperature points. Preferably, the value range of T0 is 390-425 ℃, and preferably 400-420 ℃.
When the primary thermal imaging image is judged to have the suspected high-temperature point, the thermal imaging instrument tracks and shoots a secondary thermal imaging image of the material at the suspected high-temperature point entering a second imaging area at the tail part of the vibrating screen, and whether the suspected high-temperature point is the high-temperature point is further judged.
Dividing the secondary thermal imaging image into n areas, obtaining the highest temperature of each of the n areas, selecting the highest temperature value T2 of the n highest temperatures, and comparing the highest temperature value T2 with a set target temperature T0. If T2 is not more than T0, the suspected high temperature point is judged to be a false high temperature point, and the step 1) is repeated. And if T2 is greater than T0, confirming that the suspected high temperature point is the high temperature point. The highest temperature value T2 corresponds to the area on the secondary thermal imaging image, so that the found position of the material at the high temperature point in the second imaging area on the vibrating screen is determined and recorded.
Preferably, the top of the light shield is also provided with a dustproof cooling protective cover. The thermal imaging camera is installed in the dustproof cooling protective cover. The thermal imaging system and the dustproof cooling protective cover are swung back and forth around the base point by taking the connecting position of the dustproof cooling protective cover and the light shield as the base point.
Preferably, a cooling medium is introduced into the dustproof cooling protection cover, and the cooling medium is ejected into the light shield from the dustproof cooling protection cover. Preferably, the cooling medium is one of compressed air, water and nitrogen. Preferably, a black coating is arranged on the inner wall of the light shield.
Preferably, the cover plate of the vibrating screen is provided with an opening. The light shield is positioned on the upper part of the opening. The width of the openings is equal or substantially equal to the width of the shaker.
Preferably, the cover plate of the vibrating screen is also provided with a dust removal air port. The dust removal wind gap is located the upstream of lens hood. And the dust removal device removes dust for the materials on the vibrating screen through the dust removal air opening.
Preferably, the thermal imager is connected with a data processing module, the data processing module is connected with a main process computer control system, and meanwhile, a fire extinguishing gas valve of the fire extinguishing gas blowing device is connected with the main process computer control system. And when the thermal imaging image is judged to have a high-temperature point, the data processing module gives an alarm to the main process computer control system, and the main process computer control system realizes the fire extinguishing and cooling treatment on the corresponding high-temperature material by controlling the operation of the fire extinguishing gas valve.
According to a second embodiment of the present invention, a method for extinguishing fires and cooling activated carbon on a vibrating screen is provided.
A method for extinguishing fire and reducing temperature by active carbon on a vibrating screen comprises the following steps:
1) the thermal imaging instrument shoots the material entering the imaging area at the tail part of the vibrating screen in real time to obtain a thermal imaging image;
2) analyzing and judging whether the material entering the imaging area has a high temperature point or not according to the thermal imaging image;
2a) if the thermal imaging image does not have the high temperature point, repeating the step 1);
2b) and if the thermal imaging image is judged to have a high temperature point, extinguishing and cooling the material at the high temperature point through an autoignition activated carbon extinguishing and cooling device arranged at the tail part of the vibrating screen.
In the invention, the spontaneous combustion activated carbon extinguishing cooling device is a cooling water spraying device. The cooling water spraying device is arranged on an end plate at the tail part of the vibrating screen. And a cooling water valve is arranged on the cooling water spraying device.
Preferably, in step 2b), when it is judged that the thermographic image has a high temperature point, the current time t0 is recorded. And starting from the t0 moment, opening a cooling water valve of the cooling water spraying device, and spraying water to the corresponding high-temperature material by the cooling water spraying device to cool. And after the cooling water spraying device sprays water to the high-temperature material for a duration t2, the cooling water valve is closed, and the high-temperature material achieves the effect of extinguishing and cooling. Wherein the duration t2 of the cooling water spray device spraying water satisfies the following relation:
wherein: t2 is the duration of cooling water spray, s. C h The specific heat capacity of the activated carbon is kJ/(kg-DEG C). M h Kg is the amount of activated carbon to be cooled. Δ t h Is the target of active carbon temperature reduction. C w1 kJ/(kg. DEG C.) is the specific heat capacity of water at the evaporation temperature. C w2 kJ/(kg. DEG.C.) is the specific heat capacity of water at the initial temperature. T is w1 The evaporation temperature of water, DEG C. Rho w Density of cooling water, kg/m 3 。T w2 For coolingThe initial temperature of the water sprayed by the water spraying device is DEG C. h is w Is the latent heat of vaporization of water at the evaporation temperature, kJ/kg. S 2 Is the cross-sectional area of the spray hole of the cooling water spray device, m 2 。v 2 The flow rate of the water sprayed from the cooling water spray device is m/s. k is a radical of 2 The value is 1.2-1.9 for safety factor.
In the invention, the vibrating screen is provided with the cover plate, and the material entering the vibrating screen moves along the length direction of the vibrating screen. Preferably, the imaging region includes a first imaging region and a second imaging region. At the end of the shaker, the first imaging zone is located upstream of the second imaging zone.
In step 1), the thermal imager shoots the material that gets into in the shale shaker tail portion imaging area in real time, obtains the thermal imaging image, specifically is:
1a) a light shield is arranged on a cover plate at the tail part of the vibrating screen, and a thermal imager is arranged at the top of the light shield;
1b) the connecting position of the thermal imaging camera and the light shield is taken as a base point, and the thermal imaging camera swings back and forth around the base point. The thermal imaging instrument shoots materials entering a first imaging area and/or a second imaging area at the tail part of the vibrating screen in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image.
In the invention, in step 2), whether the material entering the imaging area has a high temperature point is judged according to the thermal imaging image analysis, specifically:
the thermal imaging instrument shoots the material entering the first imaging area at the tail part of the vibrating screen in real time to obtain a primary thermal imaging image. The maximum temperature value T1 in the primary thermographic image is acquired and compared with the set target temperature T0 by the maximum temperature value T1. And if T1 is not more than T0, judging that the primary thermal imaging image does not have a high temperature point, and repeating the step 1). And if T1 is greater than T0, judging that the primary thermal imaging image has a suspected high-temperature point. Preferably, the value range of T0 is 390-425 ℃, and preferably 400-420 ℃.
When the primary thermal imaging image is judged to have the suspected high-temperature point, the thermal imaging instrument tracks and shoots a secondary thermal imaging image of the material at the suspected high-temperature point entering a second imaging area at the tail part of the vibrating screen, and whether the suspected high-temperature point is the high-temperature point is further judged.
Dividing the secondary thermal imaging image into n areas, obtaining the highest temperature of each of the n areas, selecting the highest temperature value T2 of the n highest temperatures, and comparing the highest temperature value T2 with a set target temperature T0. If T2 is not more than T0, the suspected high temperature point is judged to be a false high temperature point, and the step 1) is repeated. And if T2 is greater than T0, confirming that the suspected high temperature point is the high temperature point. The highest temperature value T2 corresponds to the area on the secondary thermal imaging image, so that the found position of the material on the vibrating screen in the second imaging area at the high temperature point is determined and recorded.
Preferably, the top of the light shield is also provided with a dustproof cooling protective cover. The thermal imaging camera is installed in the dustproof cooling protective cover. The thermal imaging system and the dustproof cooling protective cover are swung back and forth around the base point by taking the connecting position of the dustproof cooling protective cover and the light shield as the base point.
Preferably, a cooling medium is introduced into the dustproof cooling protection cover, and the cooling medium is ejected into the light shield from the dustproof cooling protection cover. Preferably, the cooling medium is one of compressed air, water and nitrogen. Preferably, a black coating is arranged on the inner wall of the light shield.
Preferably, the cover plate of the vibrating screen is provided with an opening. The light shield is positioned on the upper part of the opening. The width of the openings is equal or substantially equal to the width of the shaker.
Preferably, the cover plate of the vibrating screen is also provided with a dust removal air port. The dust removal wind gap is located the upstream of lens hood. And the dust removal device removes dust for the materials on the vibrating screen through the dust removal air opening.
Preferably, the thermal imager is connected with a data processing module, the data processing module is connected with a main process computer control system, and a cooling water valve of the cooling water spraying device is connected with the main process computer control system. And when the thermal imaging image is judged to have a high-temperature point, the data processing module gives an alarm to the main process computer control system, and the main process computer control system realizes the fire extinguishing and cooling treatment on the corresponding high-temperature material by controlling the operation of the cooling water valve.
According to a third embodiment of the present invention, a system for fighting fires and cooling on a shaker screen is provided.
A fire extinguishing and cooling system of active carbon on a vibrating screen or a fire extinguishing and cooling system of active carbon on a vibrating screen for the method of the first embodiment comprises a thermal imager, a vibrating screen and a spontaneous combustion active carbon extinguishing and cooling device. And a cover plate is arranged on the vibrating screen. The thermal imaging camera is arranged above the cover plate at the tail part of the vibrating screen. The spontaneous combustion activated carbon extinguishing cooling device is arranged at the tail of the vibrating screen. And an imaging area is arranged at the tail part of the vibrating screen.
In the invention, the spontaneous combustion activated carbon extinguishing cooling device is a fire extinguishing gas blowing device. The fire extinguishing gas blowing device is arranged on an end plate at the tail part of the vibrating screen. The fire extinguishing gas blowing device comprises a fire extinguishing gas main pipe and a fire extinguishing gas branch pipe. The fire extinguishing gas main pipe is arranged outside the vibrating screen. One end of the fire extinguishing gas branch pipe is communicated with the fire extinguishing gas main pipe, and the other end of the fire extinguishing gas branch pipe extends into the vibrating screen. And one end of the fire extinguishing gas branch pipe, which is positioned in the vibrating screen, is provided with a fire extinguishing gas nozzle. Preferably, the fire extinguishing gas blowing device further includes a fire extinguishing gas valve. The fire extinguishing gas valve is arranged on the fire extinguishing gas main pipe and located at the upper stream of the connecting position of the fire extinguishing gas branch pipe and the fire extinguishing gas main pipe, and the fire extinguishing gas valve controls the opening and closing of the fire extinguishing gas blowing device.
Preferably, the end plate at the tail part of the vibrating screen is provided with a through hole. The fire extinguishing gas branch pipe extends into the vibrating screen through the through hole. The aperture of the through hole is larger than the vibration amplitude range of the vibrating screen. Preferably, a flexible seal is provided at the entrance of the fire suppressing gas nozzle. The flexible sealing element is a flexible rubber sheet or a flexible rubber sleeve. Preferably, in the fire extinguishing gas blowing apparatus, the number of the fire extinguishing gas branch pipes is 1 to 50, preferably 2 to 30. Each fire extinguishing gas branch pipe is communicated with a fire extinguishing gas main pipe, and the fire extinguishing gas branch pipes are arranged in parallel at intervals.
Preferably, the system further comprises a light shield. The light shield is arranged on the cover plate at the tail part of the vibrating screen. The thermal imager is disposed on top of the light shield. The imaging region includes a first imaging region and a second imaging region. At the end of the shaker, the first imaging zone is located upstream of the second imaging zone. The connecting position of the thermal imaging camera and the light shield is taken as a base point, and the thermal imaging camera swings back and forth around the base point. The thermal imaging instrument shoots materials entering a first imaging area and/or a second imaging area at the tail part of the vibrating screen in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image.
Preferably, the top of the light shield is also provided with a dustproof cooling protective cover. The thermal imaging camera is installed in the dustproof cooling protective cover. The thermal imaging system and the dustproof cooling protective cover are swung back and forth around the base point by taking the connecting position of the dustproof cooling protective cover and the light shield as the base point. Preferably, the inner wall of the light shield is provided with a black coating.
Preferably, the cover plate at the tail part of the vibrating screen is provided with an opening. The light shield is positioned on the upper part of the opening. The width of the openings is equal or substantially equal to the width of the shaker.
Preferably, the cover plate of the vibrating screen is also provided with a dust removal air port. The dust removal wind gap is located the upstream of lens hood. And the dust removal device removes dust for the materials on the vibrating screen through the dust removal air opening.
Preferably, the system further comprises a data processing module and a main process computer control system. The thermal imaging instrument is connected with the data processing module, the data processing module is connected with the main process computer control system, and meanwhile, the fire extinguishing gas valve of the fire extinguishing gas blowing device is connected with the main process computer control system. The main process computer control system controls the operation of the data processing module, the thermal imager and the fire extinguishing gas valve.
According to a fourth embodiment of the present invention, a system for fighting fires and cooling on a shaker screen is provided.
A fire extinguishing and cooling system of active carbon on a vibrating screen or a fire extinguishing and cooling system of active carbon on a vibrating screen for the method of the second embodiment comprises a thermal imager, a vibrating screen and a spontaneous combustion active carbon extinguishing and cooling device. And a cover plate is arranged on the vibrating screen. The thermal imaging camera is arranged above the cover plate at the tail part of the vibrating screen. The spontaneous combustion activated carbon extinguishing cooling device is arranged at the tail of the vibrating screen. And an imaging area is arranged at the tail part of the vibrating screen.
In the invention, the spontaneous combustion activated carbon extinguishing cooling device is a cooling water spraying device. The cooling water spraying device is arranged on an end plate at the tail part of the vibrating screen. The cooling water spraying device comprises a cooling water main pipe and a cooling water branch pipe. The cooling water main pipe is arranged outside the vibrating screen. One end of the cooling water branch pipe is communicated with the cooling water main pipe, and the other end of the cooling water branch pipe extends into the vibrating screen. And one end of the cooling water branch pipe, which is positioned in the vibrating screen, is provided with a cooling water nozzle. Preferably, the cooling water sprinkler further comprises a cooling water valve. And the cooling water valve is arranged on the cooling water main pipe and is positioned at the upper stream of the connecting position of the cooling water branch pipe and the cooling water main pipe, and the cooling water valve controls the cooling water spraying device to be opened and closed.
Preferably, the end plate at the tail part of the vibrating screen is provided with a through hole. The cooling water branch pipe extends into the vibrating screen through the through hole. The aperture of the through hole is larger than the vibration amplitude range of the vibrating screen. Preferably, the inlet of the cooling water nozzle is provided with a flexible sealing member. The flexible sealing element is a flexible rubber sheet or a flexible rubber sleeve. Preferably, in the cooling water spraying device, the number of the cooling water branch pipes is 1 to 50, preferably 2 to 30. Each cooling water branch pipe is communicated with a cooling water main pipe, and the cooling water branch pipes are arranged in parallel at intervals.
Preferably, the system further comprises a light shield. The light shield is arranged on the cover plate at the tail part of the vibrating screen. The thermal imager is disposed on top of the light shield. The imaging region includes a first imaging region and a second imaging region. At the end of the shaker, the first imaging zone is located upstream of the second imaging zone. The connecting position of the thermal imaging camera and the light shield is taken as a base point, and the thermal imaging camera swings back and forth around the base point. The thermal imaging instrument shoots materials entering a first imaging area and/or a second imaging area at the tail part of the vibrating screen in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image.
Preferably, the top of the light shield is also provided with a dustproof cooling protective cover. The thermal imaging camera is installed in the dustproof cooling protective cover. The thermal imaging system and the dustproof cooling protective cover are swung back and forth around the base point by taking the connecting position of the dustproof cooling protective cover and the light shield as the base point. Preferably, the inner wall of the light shield is provided with a black coating.
Preferably, the cover plate at the tail part of the vibrating screen is provided with an opening. The light shield is positioned on the upper part of the opening. The width of the openings is equal or substantially equal to the width of the shaker.
Preferably, the cover plate of the vibrating screen is also provided with a dust removal air port. The dust removal wind gap is located the upstream of lens hood. And the dust removal device removes dust for the materials on the vibrating screen through the dust removal air opening.
Preferably, the system further comprises a data processing module and a main process computer control system. The thermal imager is connected with the data processing module, the data processing module is connected with the main process computer control system, and meanwhile, the cooling water valve of the cooling water spraying device is connected with the main process computer control system. The main process computer control system controls the operation of the data processing module, the thermal imager and the cooling water valve.
As shown in fig. 1, the activated carbon flue gas purification device circulates between the desorption tower and the adsorption tower, all links such as the desorption tower, the adsorption tower, the conveyor and the buffer bin are all airtight structures, and activated carbon is in a large amount of gathering states in the above devices, and occasionally appearing high-temperature activated carbon may be surrounded by a group of normal-temperature activated carbon, so that high-temperature activated carbon particles are difficult to detect comprehensively.
In the activated carbon flue gas purification device, activated carbon circulates between an analysis tower and an adsorption tower, and all the activated carbon needs to be screened out by a vibrating screen in the circulation. The active carbon powder screening is a subsequent process of a desorption tower (a high-temperature heating link), and active carbon particles are in a rolling and flat-spreading state on a vibrating screen. Therefore, the high-temperature activated carbon particles (or the spontaneous combustion activated carbon) are detected in the activated carbon screening link, and the high-temperature activated carbon particles in the activated carbon flue gas purification process can be found more conveniently. And because the active carbon particles at the falling section of the rear end (namely the tail part) of the vibrating screen are in a parabolic shape, the active carbon particles in the falling process are more dispersed than the upper horizontal section of the vibrating screen, and the active carbon particles at the bottom layer are shielded by the active carbon particles at the surface layer to the minimum, so that the active carbon particles are easier to detect and identify by a thermal imaging instrument. Consequently, this application sets up thermal imaging system in the top of shale shaker afterbody apron, arranges here that thermal imaging system more can detect all active carbon particles comprehensively, avoids lou examining.
After the thermal imaging system detects the spontaneous combustion activated carbon particles, namely high temperature points, the relatively safe disposal mode mainly comprises: 1. discharging the spontaneous combustion activated carbon; the exhausted spontaneous combustion activated carbon often increases the loss of an activated carbon flue gas purification system, and exhausted spontaneous combustion activated carbon particles need further treatment; 2. extinguishing and cooling the spontaneous combustion activated carbon; after the spontaneous combustion activated carbon particles are extinguished, if the high-temperature state above the spontaneous combustion point is continuously maintained, spontaneous combustion can occur when the spontaneous combustion activated carbon particles meet air, so that the spontaneous combustion activated carbon particles need to be extinguished and cooled for safe disposal.
The application provides a method for extinguishing a fire and reducing the temperature of active carbon on a vibrating screen, wherein in the method, a thermal imaging instrument firstly shoots materials in an imaging area at the tail of the vibrating screen in real time to obtain a thermal imaging image; and analyzing and judging whether the material entering the imaging area has a high temperature point or not according to the thermal imaging image. And if the thermal imaging image does not have the high temperature point, the thermal imager continues to monitor the material entering the imaging area at the tail part of the vibrating screen. And when the thermal imaging image is judged to have a high-temperature point, extinguishing and cooling the corresponding high-temperature material through the spontaneous combustion activated carbon extinguishing and cooling device arranged at the tail part of the vibrating screen, so that extinguishing and cooling of the high-temperature material are realized.
In the invention, the method for extinguishing fire and reducing temperature by using the active carbon on the vibrating screen comprises two embodiments. In a first embodiment, the spontaneous combustion activated carbon quenching cooling device is an extinguishing gas blowing device. The scheme adopts nitrogen and CO 2 Inert gases and the like can insulate oxygen to extinguish fire, on one hand, the extinguishing gas can insulate oxygen to prevent high temperature and smoldering active carbon from burning to play a role in extinguishing fire, and can bring away part of heat to play a role in cooling; on the other hand, solutionA large amount of nitrogen is needed by the separation tower, and a nitrogen gas generating and storing device is arranged nearby, so that the fire extinguishing and cooling system can be directly used; correspondingly, there is CO nearby 2 Gas-generating and gas-storing apparatus, e.g. CO produced during high-temperature calcination of limestone (or dolomite) 2 Then the use of CO is also contemplated 2 Used as cooling medium to extinguish fire and reduce temperature. The fire extinguishing gas blowing device is arranged on the end plate at the tail part of the vibrating screen, namely the fire extinguishing gas blowing device is directly arranged at a position near the downstream of the thermal imager, when the thermal imager detects that high-temperature materials exist at the tail part of the vibrating screen, the fire extinguishing gas blowing device immediately opens the fire extinguishing gas valve, and rapidly blows the fire extinguishing gas to corresponding falling high-temperature materials to extinguish fire and cool, so that peripheral materials are prevented from being ignited due to untimely treatment, and the safe and stable operation of the system is ensured. In the invention, according to the heat balance between the active carbon and the fire extinguishing gas, the duration t1 of fire extinguishing and temperature reduction of the fire extinguishing gas spraying device can be obtained:
generally, the average temperature of the cooled activated carbon particles discharged from the desorption tower is about 120 to 140 ℃, the temperature of the activated carbon is lowered to a predetermined target temperature T0 or less, and the amount of the extinguishing gas is considered to be, for example, a temperature of 20 to 50 ℃ for the cooled activated carbon (e.g., Δ T) h 30 ℃ below zero. Ideally, the fire suppressing gas is heated to an average temperature of all the activated carbon particles, e.g., 125 ℃, during the heat exchange process; if the initial temperature of the extinguishing gas is 25 ℃, at this time, Δ t n 125-25-100 ℃. In formula 1, the duration t1 of the fire extinguishing and cooling of the fire extinguishing gas blowing device means that the high-temperature activated carbon particles falling down from the vibrating screen can be filled with the tail of the vibrating screen by the fire extinguishing gas, oxygen is isolated, partial heat is taken away, and the purposes of reducing the temperature of the high-temperature and smoldering activated carbon particles and extinguishing the smoldering activated carbon particles are achieved. The duration t1 of fire extinguishing and temperature reduction also shows that the dosage of fire extinguishing gas is precisely controlled, so that the technical scheme of the invention can extinguish and cool the spontaneous combustion activated carbon particlesMeanwhile, the use cost of the fire extinguishing gas can be controlled.
In a second embodiment, the spontaneous combustion activated carbon quenching cooling device is a cooling water spraying device. According to the scheme, water is selected as a cooling medium for extinguishing fire and reducing temperature by using active carbon. On one hand, the specific heat ratio of water to nitrogen and CO 2 When the specific heat capacity of the gas is large, the temperature reduction amplitude of water with the same volume is larger, and the required water quantity is smaller; on the other hand, the water spraying amount is less, water vapor generated after water absorbs heat when meeting the high-temperature activated carbon is less, in the application scene of the invention, spontaneous combustion or high-temperature activated carbon particles are local high-temperature points in all activated carbon particles, the volume and the range of the activated carbon particles at the high-temperature points are very small, the activated carbon particles can be rapidly cooled when meeting water, and the water vapor reaction can not occur between a small amount of water vapor and the activated carbon at a lower temperature. In addition, in view of the low cost and ready availability of water, water is used as the cooling medium in the second embodiment of the present invention. According to the invention, the cooling water spraying device is arranged on the end plate at the tail part of the vibrating screen, namely, the cooling water spraying device is directly arranged at a position near the downstream of the thermal imager, when the thermal imager detects that high-temperature materials exist at the tail part of the vibrating screen, the cooling water spraying device immediately opens the cooling water valve, and quickly sprays water mist to the corresponding high-temperature materials which are about to fall to extinguish fire and reduce the temperature, so that peripheral materials are prevented from being ignited due to untimely treatment, and the safe and stable operation of the system is ensured. In the invention, according to the heat balance between the activated carbon and the cooling water, the duration t2 of the fire extinguishing and temperature lowering of the cooling water spraying device can be obtained:
generally, the average temperature of the cooled activated carbon particles discharged from the desorption tower is about 120 to 140 ℃, the temperature of the activated carbon is lowered to a predetermined target temperature T0 or less, and the amount of cooling water is, for example, considered to reduce the temperature of the activated carbon by 15 to 20 ℃ (Δ T, for example) h 20 c) to ensure that the cooling water is completely converted to water vapor during the cooling process, i.e. liquid water is not carried into the chain bucket, when the cooling water rises during the heat exchange processThe temperature reaches the water evaporation temperature at the local atmospheric pressure, for example 100 ℃. The water evaporation temperature as used herein refers to the temperature of water at which it rapidly evaporates in large quantities. In formula 2, the duration t2 of the fire extinguishing and cooling of the cooling water spraying device means that high-temperature activated carbon particles falling from the vibrating screen can pass through the curtain formed by the water mist to take away part of heat of the high-temperature and smoldering activated carbon, so that the purposes of reducing the temperature of the high-temperature and smoldering activated carbon particles and extinguishing the smoldering activated carbon particles are achieved, and meanwhile, the water mist is converted into water vapor through heat exchange. The duration t2 of fire extinguishing and temperature reduction indicates that the invention avoids liquid water from being brought into the vibrating screen and even the whole flue gas purification device by accurately controlling the water spraying amount of the cooling water spraying device, thereby avoiding the adhesion of the activated carbon powder on the conveying equipment caused by the liquid water in the conveying system, and simultaneously avoiding the incomplete analysis of SO in the liquid water and the activated carbon 2 Reaction to form H 2 SO 4 And corrodes the transport equipment. The invention adopts water which is low in cost and easy to obtain as a medium for extinguishing and cooling the activated carbon, reduces the use cost and avoids common technical problems which may occur when the water is used as the extinguishing and cooling medium.
Further, in the above-described formulas 1 and 2, M h Kg is the amount of activated carbon to be cooled. As can be seen from fig. 6, the high-temperature activated carbon particles passing through the spontaneous combustion activated carbon extinguishing cooling device at the tail of the vibrating screen come from a discharge device (such as a roller feeder) of the desorption tower, the amount of activated carbon to be cooled at present is the same as the flow rate of the discharge device of the desorption tower at a certain moment in the past, and the time length in the middle is t, wherein t represents the time length of the activated carbon particles from the discharge device of the desorption tower to the found position of the high-temperature activated carbon particles, and is unit of s. The time at which the high temperature activated carbon particles were found in the imaging zone at the rear of the vibrating screen was set to t 0. Therefore, the time t0 is advanced by t time, and the amount of the activated carbon to be cooled can be obtained by measuring the blanking flow of the activated carbon of the discharge device of the desorption tower at that time.
Preferably, the specific high-temperature detection process in the method of the present invention is as follows: firstly, shooting a material entering a first imaging area at the tail part of the vibrating screen by a thermal imaging instrument to obtain a primary thermal imaging image; analyzing and judging whether the material entering the first imaging area has suspected high-temperature points or not according to the primary thermal imaging image; tracking and shooting the material with the suspected high-temperature point in the primary thermal imaging image, and acquiring a secondary thermal imaging image of the material at the suspected high-temperature point entering the second imaging area; and analyzing and judging whether the suspected high-temperature point is a high-temperature point or not according to the secondary thermal imaging image. And when the suspected high-temperature point is confirmed to be the high-temperature point, recording the found position of the high-temperature point material in the second imaging area and giving an alarm.
In the invention, the thermal imaging image (i.e. the primary thermal imaging image or the secondary thermal imaging image) is an infrared image with temperature information, and the temperature information of the material at each point in the imaging area can be read from the thermal imaging image. Comparing the highest temperature value T1 in the primary thermographic image with the target temperature T0, it can be determined whether there is a high temperature point in the primary thermographic image. And if the T1 is not more than T0, judging that the primary thermal imaging image does not have a high-temperature point, and continuously carrying out high-temperature monitoring on the material subsequently entering the first imaging area by the thermal imaging instrument. If T1 is greater than T0, the primary thermal imaging image is judged to have a suspected high temperature point; the thermal imager further shoots the material at the suspected high-temperature point to obtain a secondary thermal imaging image of the material in the second imaging area. Dividing the secondary thermal imaging image into n regions (for example, into nine-square grids), acquiring a highest temperature value T2 in the n regions, and comparing the T2 with a target temperature T0 to determine whether the suspected high temperature point is a high temperature point. If T2 is not more than T0, the suspected high temperature point is judged to be a false high temperature point, and the thermal imager continues to monitor the high temperature of the material entering the first imaging area subsequently. If T2 is greater than T0, the suspected high temperature point is confirmed to be a high temperature point, the highest temperature value T2 corresponds to the area on the secondary thermal imaging image, and therefore the found position of the material at the high temperature point in the second imaging area is determined and an alarm is given to a main control (namely a main process computer control system). In order to further embody the accuracy or precision of the high-temperature detection, the secondary thermal imaging image can be a plurality of continuously shot pictures, and the temperature information of the material at the suspected high-temperature point in the plurality of continuously shot pictures is compared, so that more accurate judgment is made on whether the suspected high-temperature point is the high-temperature point.
In the transportation process of high-temperature materials, when the temperature of the materials reaches a certain value, oxidation exothermic reaction can occur in the materials, so that the temperature of the materials is further increased; but the vibration or the relative change of the internal position exists between the materials in the transportation process, so that the condition of the oxidation exothermic reaction of the materials can be destroyed, and the temperature of the materials is reduced. If the situation that the material is high in temperature or spontaneously combusted is directly judged through a primary thermal imaging image after a primary high-temperature point is detected, the found position of the material at the high-temperature point is marked and subjected to alarm processing, and the situation that processing is improper due to inaccurate detection is inevitable. According to the technical scheme, the process of identifying the high-temperature point materials is divided into preliminary judgment of suspected high-temperature points, tracking judgment is carried out on the suspected high-temperature points, and therefore accurate judgment data of the high-temperature points are obtained. The accurate judgment of the high temperature point of the material is also beneficial to the subsequent further processing of the material aiming at the high temperature point.
It should be noted that, in the transportation process of the material by the vibrating screen or the conveyer, local relative displacement occurs between material particles on the conveyer due to the vibration of the conveyer, so that the material which may be self-burning releases heat, and the initial suspected high temperature point is determined as the false high temperature point.
Generally speaking, the main body of the vibrating screen is a sealing structure, active carbon moves in the vibrating screen, and conventional detection modes such as a thermocouple arranged in the existing vibrating screen are difficult to capture high-temperature active carbon particles passing through rapidly. The thermal imaging camera is arranged in the vibrating screen, so that the problems of insufficient space and severe working environment (vibration and dust) exist. Therefore, the existing vibrating screen needs to be modified to meet the requirement of a thermal imaging camera on detecting high-temperature activated carbon particles.
In this application, the thermal imaging camera is disposed above the shaker tail cover plate (i.e., the thermal imaging camera is disposed independently of the shaker). Be equipped with the trompil with the shale shaker width on the apron of shale shaker afterbody, the imaging area of thermal imaging system covers the trompil width, covers the active carbon particle and the active carbon particle of a small segment horizontal segment of shale shaker rear end whereabouts section, and the thermal imaging system passes through the active carbon that the trompil flowed through on to the shale shaker sieve carries out real-time supervision. Preferably, the thermal imaging camera is arranged on the top of a light shield, and the light shield is arranged on the upper part of the opening at the tail part of the vibrating screen. The light shield is provided with a black coating to prevent light reflection. The lens hood can play the purpose of shielding external light, eliminates the interference of external light to the thermal imager. In the invention, the connecting position of the thermal imaging camera and the light shield is taken as a base point, and the thermal imaging camera performs reciprocating swing around the base point; the thermal imaging instrument shoots materials entering a first imaging area and/or a second imaging area at the tail part of the vibrating screen in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image.
Further preferably, the thermal imaging camera is mounted in a dustproof cooling protective cover, and the dustproof cooling protective cover is arranged at the top of the light shield. The tail part of the dustproof cooling protective cover (namely, one end of the dustproof cooling protective cover, which is positioned outside the light shield) is filled with a cooling medium, the cooling medium is sprayed out from the front end of the dustproof cooling protective cover (namely, one end of the dustproof cooling protective cover, which is positioned in the light shield), and the cooling medium is used for cooling the thermal imager and ensures that the working temperature of the thermal imager is not higher than 60 ℃. Meanwhile, the cooling medium can prevent dust from entering the thermal imager to cause instrument failure. The cooling medium of the front end spun of dustproof cooling safety cover still plays clean guard action to the camera lens of thermal imager and safety cover high definition protection lens, prevents the dust gathering, pollutes camera lens and safety cover high definition protection lens. In addition, the cooling medium sprayed out of the dustproof cooling protective cover can maintain positive pressure in the light shield, prevent external dust from entering the light shield, and prevent individual activated carbon particles from jumping out of the vibrating screen from the opening of the light shield to damage a thermal imager. The cooling medium is not particularly limited and may perform the above-described functions, and for example, the cooling medium is one of compressed air, water, and nitrogen. In the present invention, the thermal imaging system and the dust-proof cooling protective cover are reciprocated about a base point at a connecting position of the dust-proof cooling protective cover and the light shield.
In the invention, the cover plate of the vibrating screen is also provided with a dust removal air port. The dust removal wind gap is located the upstream of lens hood. The cooling medium sprayed out of the front end of the dustproof cooling protective cover and the negative pressure of the dust removal air port remove dust in the space of the thermal imaging range, and are beneficial to improving the accuracy of thermal imaging and providing a good working environment for a thermal imager.
In the invention, the installation height, the lens and the like of the thermal imager are adjusted according to the actual situation on site. Thermal imaging system, dustproof cooling safety cover, lens hood are a whole, and this whole is independent of the shale shaker, is located the top of shale shaker afterbody apron, and is higher 1 ~ 2cm than shale shaker apron position.
In the present invention, one or more thermal imagers may be provided on top of the light shield. In specific implementation, can set up a plurality of thermal imaging cameras, shoot the material that gets into in the formation of image district through controlling a plurality of independent thermal imaging cameras and acquire the thermal imaging image to guarantee not to omit the material among the high temperature testing process, solved the problem that is difficult to detect comprehensively among the prior art. Simultaneously, the thermal imaging system does reciprocating swing around the basic point, and the position of thermal imaging system can swing along with the transport of material on the shale shaker promptly, and to the material of suspected high temperature point, the thermal imaging system can further track and judge to make and detect more accurately, also more be favorable to realizing the comprehensiveness that detects.
In the invention, the system for extinguishing fire and reducing temperature by using the active carbon on the vibrating screen further comprises a main process computer control system (for short, master control) and a data processing module. The method comprises the steps that after a thermal imager acquires a thermal imaging image of a material in an imaging area, whether a high-temperature point exists in the corresponding material or not is judged according to the thermal imaging image, data information judged as the high-temperature point is transmitted to a data processing module, the data processing module is connected with a main control, an alarm is sent to the main control, and the main control enters the next processing flow.
In the present application, the material refers to activated carbon, and is generally fresh activated carbon after being desorbed by an desorption tower.
In the present application, the terms "upstream" and "downstream" refer to relative concepts in terms of the flow direction of activated carbon particles on a conveying device such as a vibrating screen, that is, a position where activated carbon particles pass first on the conveying device is upstream, and a position where activated carbon particles pass later is downstream. Or, the upstream and the downstream are relative concepts according to the flowing direction of the cooling medium in the pipeline in the active carbon fire-extinguishing and temperature-reducing system.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the thermal imaging system is arranged above the vibrating screen tail cover plate, and because the active carbon particles at the tail part of the vibrating screen are in a parabolic falling state, the active carbon particles are more dispersed when falling than other positions, the active carbon particles at the bottom layer are shielded by the active carbon particles at the surface layer to the minimum, and are easier to detect and identify by the thermal imaging system, namely, the thermal imaging system is arranged at the position to detect all the active carbon particles more comprehensively, and the omission is avoided.
2. According to the invention, a high-temperature detection mode of the thermal imager is adopted, and accurate judgment data of the high-temperature point is obtained by preliminarily judging the suspected high-temperature point and tracking and judging the suspected high-temperature point, so that the detection accuracy is improved.
3. According to the technical scheme provided by the invention, under the condition that the materials in the imaging area at the tail part of the vibrating screen are identified to have high temperature points, the fire extinguishing gas injection amount of the fire extinguishing gas injection device can be accurately controlled, and the use cost of the fire extinguishing gas can be controlled while the high temperature materials are extinguished and cooled.
4. According to the technical scheme provided by the invention, under the condition that the materials in the imaging area at the tail part of the vibrating screen are identified to have high temperature points, the water spraying amount of the cooling water spraying device can be accurately controlled, the high-temperature materials are extinguished and cooled, meanwhile, the liquid water is prevented from being brought into a conveying system, and the safety of the system is improved.
5. The arrangement of the light shield can achieve the purpose of shielding external light and eliminate the interference of the external light on the thermal imager; meanwhile, due to the arrangement of the dustproof cooling protective cover and the introduction of a cooling medium into the dustproof cooling protective cover, the thermal imager can be cooled, dust is prevented from being accumulated, and a lens of the thermal imager and a high-definition protective lens of the protective cover are cleaned and protected.
Drawings
FIG. 1 is a schematic diagram of an activated carbon desulfurization and denitrification apparatus in the prior art;
FIG. 2 is a schematic diagram of a prior art desorption tower;
FIG. 3 is a flow chart of a method for extinguishing fires and cooling by activated carbon on a vibrating screen according to the present invention;
FIG. 4 is a schematic structural diagram of a system for extinguishing fires and cooling by activated carbon on a vibrating screen according to the present invention;
FIG. 5 is a schematic view showing the construction of a fire extinguishing gas nozzle of the fire extinguishing gas spraying apparatus according to the present invention;
FIG. 6 is a schematic diagram of another system for extinguishing fires and cooling with activated carbon on a vibrating screen according to the present invention;
FIG. 7 is a schematic view showing the structure of a cooling water nozzle of the cooling water spraying apparatus of the present invention;
FIG. 8 is a schematic view of a thermal imager acquiring a single thermal image of the material in the first imaging region in accordance with the present invention;
FIG. 9 is a schematic diagram of a thermal imager of the present invention acquiring a second thermographic image of the material in the second imaging area;
FIG. 10 is a diagram showing the relationship between a thermal imager, a data processing module, and a master control in the present invention;
fig. 11 is a data processing flow chart of the thermal imager of the present invention;
FIG. 12 is a logic diagram of a high temperature activated carbon particle process flow of the present invention;
FIG. 13 is a logic diagram of another high temperature activated carbon particle treatment process according to the present invention.
Reference numerals:
1: a thermal imager; 2: vibrating screen; 201: a cover plate; 3: an imaging area; 301: a first imaging region; 302: a second imaging area; 4: a fire extinguishing gas blowing device; 401: a fire suppressing gas valve; 402: a main fire extinguishing gas pipe; 403: a fire extinguishing gas branch pipe; 404: a fire extinguishing gas nozzle; 5: a cooling water spray device; 501: a cooling water valve; 502: a cooling water main pipe; 503: cooling water branch pipes; 504: a cooling water nozzle; 6: a light shield; 7: a dust-proof cooling protective cover; 8: a dust removal tuyere; a1: a data processing module; a2: a main process computer control system.
Detailed Description
According to a third embodiment of the present invention, a system for fighting fires and cooling on a shaker screen is provided.
A fire extinguishing and cooling system of active carbon on a vibrating screen or a fire extinguishing and cooling system of active carbon on a vibrating screen for the method of the first embodiment comprises a thermal imager 1, a vibrating screen 2 and a spontaneous combustion active carbon extinguishing and cooling device. And a cover plate 201 is arranged on the vibrating screen 2. The thermal imaging camera 1 is disposed above a cover plate 201 at the rear of the vibrating screen 2. The spontaneous combustion active carbon extinguishing cooling device is arranged at the tail part of the vibrating screen 2. And an imaging area 3 is arranged at the tail part of the vibrating screen 2.
In the invention, the spontaneous combustion active carbon extinguishing and cooling device is a fire extinguishing gas blowing device 4. The fire extinguishing gas blowing device 4 is arranged on an end plate at the tail part of the vibrating screen 2. The fire extinguishing gas blowing device 4 includes a main fire extinguishing gas pipe 402 and fire extinguishing gas branch pipes 403. A main fire suppressing gas pipe 402 is provided outside the vibrating screen 2. One end of the fire extinguishing gas branch pipe 403 is communicated with the fire extinguishing gas main pipe 401, and the other end of the fire extinguishing gas branch pipe 403 extends into the vibrating screen 2. The fire extinguishing gas branch pipe 403 is provided with a fire extinguishing gas nozzle 404 at one end located inside the vibrating screen 2. Preferably, the fire extinguishing gas blowing device 4 further includes a fire extinguishing gas valve 401. The fire extinguishing gas valve 401 is provided in the main fire extinguishing gas pipe 402 at a position upstream of a position where the fire extinguishing gas branch pipe 403 is connected to the main fire extinguishing gas pipe 402, and the fire extinguishing gas valve 401 controls the opening and closing of the fire extinguishing gas blowing device 4.
Preferably, an end plate at the tail part of the vibrating screen 2 is provided with a through hole. Through which fire extinguishing gas branch pipes 403 extend into the vibrating screen 2. The aperture of the through hole is larger than the vibration amplitude range of the vibrating screen 2. Preferably, a flexible seal is provided at the entrance of the fire suppressing gas nozzle 404. The flexible sealing element is a flexible rubber sheet or a flexible rubber sleeve. Preferably, in the fire extinguishing gas blowing device 4, the number of the fire extinguishing gas branch pipes 403 is 1 to 50, preferably 2 to 30. Each fire extinguishing gas branch pipe 403 is communicated with a fire extinguishing gas main pipe 402, and the fire extinguishing gas branch pipes 403 are arranged in parallel at intervals.
Preferably, the system further comprises a light shield 6. The light shield 6 is arranged on a cover plate 201 at the tail part of the vibrating screen 2. The thermal imaging camera 1 is disposed on top of the light shield 6. The imaging zone 3 comprises a first imaging zone 301 and a second imaging zone 302. At the rear of the shaker 2, the first imaging zone 301 is located upstream of the second imaging zone 302. The thermal imaging system 1 swings back and forth around the base point of the connection position of the thermal imaging system 1 and the light shield 6. The thermal imaging camera 1 shoots materials entering a first imaging area 301 and/or a second imaging area 302 at the tail part of the vibrating screen 2 in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image.
Preferably, the top of the light shield 6 is also provided with a dustproof cooling protective cover 7. The thermal imaging camera 1 is mounted within a dust-tight cooling protective cover 7. With the connecting position of the dustproof cooling protection cover 7 and the light shield 6 as a base point, the thermal imaging system 1 and the dustproof cooling protection cover 7 are swung back and forth around the base point. Preferably, a black coating is provided on the inner wall of the light shield 6.
Preferably, the cover plate 201 at the tail of the vibrating screen 2 is provided with an opening. A light shield 6 is located above the aperture. The width of the openings is equal or substantially equal to the width of the vibrating screen 2.
Preferably, the cover plate 201 of the vibrating screen 2 is further provided with a dust removal air port 8. The dust removal tuyere 8 is located upstream of the light shield 6. And the dust removal device removes dust from the materials on the vibrating screen 2 through the dust removal air port 8.
Preferably, the system further includes a data processing module A1 and a main process computer control system A2. The thermal imaging system 1 is connected with a data processing module A1, the data processing module A1 is connected with a main process computer control system A2, and meanwhile, a fire-extinguishing gas valve 401 of a fire-extinguishing gas blowing device 4 is connected with a main process computer control system A2. The main process computer control system a2 controls the operation of the data processing module a1, the thermal imager 1, and the fire suppressing gas valve 401.
According to a fourth embodiment of the present invention, a system for fighting fires and cooling on a shaker screen is provided.
The system for extinguishing fire and cooling by using the active carbon on the vibrating screen or the system for extinguishing fire and cooling by using the active carbon on the vibrating screen for the method of the second embodiment comprises a thermal imager 1, a vibrating screen 2 and a spontaneous combustion active carbon extinguishing cooling device. And a cover plate 201 is arranged on the vibrating screen 2. The thermal imaging camera 1 is disposed above a cover plate 201 at the rear of the vibrating screen 2. The spontaneous combustion active carbon extinguishing cooling device is arranged at the tail part of the vibrating screen 2. And an imaging area 3 is arranged at the tail part of the vibrating screen 2.
In the invention, the spontaneous combustion activated carbon extinguishing cooling device is a cooling water spraying device 5. The cooling water spraying device 5 is arranged on an end plate at the tail part of the vibrating screen 2. The cooling water sprinkler 5 includes a cooling water main pipe 502 and a cooling water branch pipe 503. The cooling water main 502 is disposed outside the vibrating screen 2. One end of the cooling water branch pipe 503 is communicated with the cooling water main pipe 501, and the other end of the cooling water branch pipe 503 extends into the vibrating screen 2. The cooling water branch pipe 503 is provided with a cooling water nozzle 504 at an end located inside the vibrating screen 2. Preferably, the cooling water sprinkler 5 further comprises a cooling water valve 501. The cooling water valve 501 is disposed on the cooling water main pipe 502, and is located upstream of a connection position of the cooling water branch pipe 503 and the cooling water main pipe 502, and the cooling water valve 501 controls opening and closing of the cooling water spraying device 5.
Preferably, an end plate at the tail part of the vibrating screen 2 is provided with a through hole. Through which cooling water branch pipes 503 extend into the vibrating screen 2. The aperture of the through hole is larger than the vibration amplitude range of the vibrating screen 2. Preferably, a flexible seal is provided at the inlet of the cooling water nozzle 504. The flexible sealing element is a flexible rubber sheet or a flexible rubber sleeve. Preferably, in the cooling water spraying device 5, the number of the cooling water branch pipes 503 is 1 to 50, preferably 2 to 30. Each of the cooling water branch pipes 503 is communicated with the cooling water main pipe 502, and the cooling water branch pipes 503 are arranged in parallel at intervals.
Preferably, the system further comprises a light shield 6. The light shield 6 is arranged on a cover plate 201 at the tail part of the vibrating screen 2. The thermal imaging camera 1 is disposed on top of the light shield 6. The imaging zone 3 comprises a first imaging zone 301 and a second imaging zone 302. At the rear of the shaker 2, the first imaging zone 301 is located upstream of the second imaging zone 302. The thermal imaging system 1 swings back and forth around the base point of the connection position of the thermal imaging system 1 and the light shield 6. The thermal imaging camera 1 shoots materials entering a first imaging area 301 and/or a second imaging area 302 at the tail part of the vibrating screen 2 in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image.
Preferably, the top of the light shield 6 is also provided with a dustproof cooling protective cover 7. The thermal imaging camera 1 is mounted within a dust-tight cooling protective cover 7. With the connecting position of the dustproof cooling protection cover 7 and the light shield 6 as a base point, the thermal imaging system 1 and the dustproof cooling protection cover 7 are swung back and forth around the base point. Preferably, a black coating is provided on the inner wall of the light shield 6.
Preferably, the cover plate 201 at the rear of the vibrating screen 2 is provided with an opening. A light shield 6 is located above the aperture. The width of the openings is equal or substantially equal to the width of the vibrating screen 2.
Preferably, the cover plate 201 of the vibrating screen 2 is further provided with a dust removal air port 8. The dust removal tuyere 8 is located upstream of the light shield 6. And the dust removal device removes dust from the materials on the vibrating screen 2 through the dust removal air port 8.
Preferably, the system further includes a data processing module A1 and a main process computer control system A2. The thermal imager 1 is connected with a data processing module A1, the data processing module A1 is connected with a main process computer control system A2, and meanwhile, a cooling water valve 501 of the cooling water spraying device 5 is connected with a main process computer control system A2. The main process computer control system a2 controls the operation of the data processing module a1, the thermal imager 1, and the cooling water valve 501.
Example 1
The utility model provides a system for active carbon extinguishment cooling on shale shaker, this system includes that thermal imaging system 1, shale shaker 2, spontaneous combustion active carbon extinguish cooling device. And a cover plate 201 is arranged on the vibrating screen 2. The thermal imaging camera 1 is disposed above a cover plate 201 at the rear of the vibrating screen 2. The spontaneous combustion active carbon extinguishing cooling device is arranged at the tail part of the vibrating screen 2. And an imaging area 3 is arranged at the tail part of the vibrating screen 2.
Example 2
As shown in fig. 8 and 9, embodiment 1 is repeated except that the system further comprises a light shield 6. The light shield 6 is arranged on a cover plate 201 at the tail part of the vibrating screen 2. The thermal imaging camera 1 is disposed on top of the light shield 6. The imaging zone 3 comprises a first imaging zone 301 and a second imaging zone 302. At the rear of the shaker 2, a first imaging zone 301 is located upstream of a second imaging zone 302. The thermal imaging system 1 swings back and forth around the base point of the connection position of the thermal imaging system 1 and the light shield 6. The thermal imaging system 1 shoots materials entering a first imaging area 301 and a second imaging area 302 at the tail part of the vibrating screen 2 in real time to obtain a primary thermal imaging image and a secondary thermal imaging image.
Example 3
Example 2 is repeated except that the top of the light shield 6 is also provided with a dust-proof cooling protective cover 7. The thermal imaging camera 1 is mounted within a dust-tight cooling protective cover 7. With the connecting position of the dustproof cooling protection cover 7 and the light shield 6 as a base point, the thermal imaging system 1 and the dustproof cooling protection cover 7 are swung back and forth around the base point. And a black coating is arranged on the inner wall of the light shield 6.
Example 4
Example 3 is repeated except that the cover plate 201 at the rear of the vibrating screen 2 is provided with openings. A light shield 6 is located above the aperture. The width of the opening is equal to the width of the vibrating screen 2.
Example 5
Example 4 is repeated, except that the cover plate 201 of the vibrating screen 2 is also provided with a dust removal air port 8. The dust removal tuyere 8 is located upstream of the light shield 6. And the dust removal device removes dust from the materials on the vibrating screen 2 through the dust removal air port 8.
Example 6
As shown in fig. 4 and 5, example 5 was repeated except that the spontaneous combustion activated carbon quenching cooling device was the fire extinguishing gas blowing device 4. The fire extinguishing gas blowing device 4 is arranged on an end plate at the tail part of the vibrating screen 2. The fire extinguishing gas blowing device 4 includes a main fire extinguishing gas pipe 402 and fire extinguishing gas branch pipes 403. A main fire suppressing gas pipe 402 is provided outside the vibrating screen 2. One end of the fire extinguishing gas branch pipe 403 is communicated with the fire extinguishing gas main pipe 401, and the other end of the fire extinguishing gas branch pipe 403 extends into the vibrating screen 2. The fire extinguishing gas branch pipe 403 is provided with a fire extinguishing gas nozzle 404 at one end located inside the vibrating screen 2. The fire extinguishing gas blowing device 4 further includes a fire extinguishing gas valve 401. The fire extinguishing gas valve 401 is provided in the main fire extinguishing gas pipe 402 at a position upstream of a position where the fire extinguishing gas branch pipe 403 is connected to the main fire extinguishing gas pipe 402, and the fire extinguishing gas valve 401 controls the opening and closing of the fire extinguishing gas blowing device 4.
Example 7
Example 6 was repeated except that the end plate of the rear portion of the vibrating screen 2 was provided with through holes. Through which fire extinguishing gas branch pipes 403 extend into the vibrating screen 2. The aperture of the through hole is larger than the vibration amplitude range of the vibrating screen 2. A flexible seal is provided at the entrance of the fire suppressing gas nozzle 404. The flexible sealing element is a flexible rubber sheet. In the fire extinguishing gas spraying device 4, the number of the fire extinguishing gas branch pipes 403 is 30. Each fire extinguishing gas branch pipe 403 is communicated with a fire extinguishing gas main pipe 402, and the fire extinguishing gas branch pipes 403 are arranged in parallel at intervals.
Example 8
As shown in FIG. 10, example 7 was repeated except that the system further included a data processing module A1 and a main process computer control system A2. The thermal imaging system 1 is connected with a data processing module A1, the data processing module A1 is connected with a main process computer control system A2, and meanwhile, a fire-extinguishing gas valve 401 of a fire-extinguishing gas blowing device 4 is connected with a main process computer control system A2. The main process computer control system a2 controls the operation of the data processing module a1, the thermal imager 1, and the fire suppressing gas valve 401.
Example 9
As shown in fig. 6 and 7, example 5 was repeated except that the spontaneous combustion activated carbon quenching cooling device was a cooling water spraying device 5. The cooling water spraying device 5 is arranged on an end plate at the tail part of the vibrating screen 2. The cooling water sprinkler 5 includes a cooling water main pipe 502 and a cooling water branch pipe 503. The cooling water main 502 is disposed outside the vibrating screen 2. One end of the cooling water branch pipe 503 is communicated with the cooling water main pipe 501, and the other end of the cooling water branch pipe 503 extends into the vibrating screen 2. The cooling water branch pipe 503 is provided with a cooling water nozzle 504 at an end located inside the vibrating screen 2. The cooling water sprinkler 5 further comprises a cooling water valve 501. The cooling water valve 501 is disposed on the cooling water main pipe 502, and is located upstream of a connection position of the cooling water branch pipe 503 and the cooling water main pipe 502, and the cooling water valve 501 controls opening and closing of the cooling water spraying device 5.
Example 10
Example 9 was repeated except that the end plate of the rear portion of the vibrating screen 2 was provided with through holes. Through which cooling water branch pipes 503 extend into the vibrating screen 2. The aperture of the through hole is larger than the vibration amplitude range of the vibrating screen 2. The inlet of the cooling water nozzle 504 is provided with a flexible seal. The flexible sealing element is a flexible rubber sleeve. In the cooling water spray device 5, the number of the cooling water branch pipes 503 is 30. Each of the cooling water branch pipes 503 is communicated with the cooling water main pipe 502, and the cooling water branch pipes 503 are arranged in parallel at intervals.
Example 11
Example 10 is repeated except that the system further includes a data processing module A1 and a main process computer control system A2. The thermal imager 1 is connected with a data processing module A1, the data processing module A1 is connected with a main process computer control system A2, and meanwhile, a cooling water valve 501 of the cooling water spraying device 5 is connected with a main process computer control system A2. The main process computer control system a2 controls the operation of the data processing module a1, the thermal imager 1, and the cooling water valve 501.
Example 12
As shown in fig. 3, a method for extinguishing fire and reducing temperature by using activated carbon on a vibrating screen comprises the following steps:
1) the thermal imaging instrument 1 shoots materials entering an imaging area 3 at the tail part of the vibrating screen 2 in real time to obtain a thermal imaging image;
2) analyzing and judging whether the material entering the imaging area 3 has a high temperature point or not according to the thermal imaging image;
2a) if the thermal imaging image does not have the high temperature point, repeating the step 1);
2b) if the thermal imaging image is judged to have a high temperature point, the material at the high temperature point is extinguished and cooled through a spontaneous combustion activated carbon extinguishing and cooling device arranged at the tail part of the vibrating screen 2.
Example 13
Example 12 is repeated except that the vibrating screen 2 is provided with a cover plate 201, and the material entering the vibrating screen 2 moves along the length direction of the vibrating screen 2. The imaging zone 3 comprises a first imaging zone 301 and a second imaging zone 302. At the rear of the shaker 2, the first imaging zone 301 is located upstream of the second imaging zone 302.
In step 1), the thermal imaging instrument 1 shoots the material entering the vibrating screen 2 tail imaging area 3 in real time to obtain a thermal imaging image, which specifically comprises:
1a) a light shield 6 is arranged on a cover plate 201 at the tail part of the vibrating screen 2, and the thermal imaging camera 1 is arranged at the top of the light shield 6;
1b) the thermal imaging system 1 swings back and forth around the base point of the connection position of the thermal imaging system 1 and the light shield 6. The thermal imaging system 1 shoots materials entering a first imaging area 301 and a second imaging area 302 at the tail part of the vibrating screen 2 in real time to obtain a primary thermal imaging image and a secondary thermal imaging image.
Example 14
As shown in fig. 11, the embodiment 13 is repeated, except that in step 2), whether the material entering the imaging area 3 has a high temperature point is judged according to the thermal imaging image analysis, specifically:
the thermal imaging instrument 1 shoots the material entering the first imaging area 301 at the tail of the vibrating screen 2 in real time to obtain a primary thermal imaging image. The maximum temperature value T1 in the primary thermographic image is acquired and compared with the set target temperature T0 by the maximum temperature value T1. And if T1 is not more than T0, judging that the primary thermal imaging image does not have a high temperature point, and repeating the step 1). And if T1 is greater than T0, judging that the primary thermal imaging image has a suspected high-temperature point. The value of T0 was 418 ℃.
When the primary thermal imaging image is judged to have the suspected high-temperature point, the thermal imaging instrument 1 tracks and shoots a secondary thermal imaging image of the material at the suspected high-temperature point entering the second imaging area 302 at the tail part of the vibrating screen 2, and further judges whether the suspected high-temperature point is the high-temperature point.
Dividing the secondary thermal imaging image into 9 areas of the nine-square grid, obtaining the highest temperature of each of the 9 areas, selecting the highest temperature value T2 of the 9 highest temperatures, and comparing the highest temperature value T2 with a set target temperature T0. If T2 is not more than T0, the suspected high temperature point is judged to be a false high temperature point, and the step 1) is repeated. And if T2 is greater than T0, confirming that the suspected high temperature point is the high temperature point. The highest temperature value T2 is used to correspond to the area on the secondary thermal image, so as to determine and record the found position of the material on the vibrating screen 2 in the second imaging area 302.
Example 15
Example 14 is repeated except that the top of the light shield 6 is also provided with a dust-tight cooling protective cover 7. The thermal imaging camera 1 is mounted within a dust-tight cooling protective cover 7. With the connecting position of the dustproof cooling protection cover 7 and the light shield 6 as a base point, the thermal imaging system 1 and the dustproof cooling protection cover 7 are swung back and forth around the base point. And a cooling medium is introduced into the dustproof cooling protective cover 7 and is sprayed out of the dustproof cooling protective cover 7 into the light shield 6. The cooling medium is compressed air. And a black coating is arranged on the inner wall of the light shield 6.
Example 16
Example 15 is repeated except that the cover plate 201 of the vibrating screen 2 is provided with openings. A light shield 6 is located above the aperture. The width of the opening is equal to the width of the vibrating screen 2.
Example 17
Example 16 is repeated except that the cover plate 201 of the vibrating screen 2 is also provided with a dust removal tuyere 8. The dust removal tuyere 8 is located upstream of the light shield 6. And the dust removal device removes dust from the materials on the vibrating screen 2 through the dust removal air port 8.
Example 18
Example 17 was repeated except that the spontaneous combustion activated carbon quenching cooling device was the fire extinguishing gas blowing device 4. The fire extinguishing gas blowing device 4 is arranged on an end plate at the tail part of the vibrating screen 2. The fire extinguishing gas blowing device 4 is provided with a fire extinguishing gas valve 401. The fire extinguishing gas is nitrogen.
As shown in fig. 12, in step 2b), when it is judged that the thermographic image has a high temperature point, the current time t0 is recorded. Starting from the time t0, the fire extinguishing gas valve 401 of the fire extinguishing gas blowing device 4 is opened, and the fire extinguishing gas blowing device 4 blows fire extinguishing gas to the corresponding high-temperature material. After the fire extinguishing gas is blown by the fire extinguishing gas blowing device 4 for the duration time t1, the fire extinguishing gas valve 401 is closed, and the high-temperature material achieves the effect of extinguishing and cooling. Wherein the duration t1 of the fire extinguishing gas blowing by the fire extinguishing gas blowing device 4 satisfies the following relational expression:
wherein: t1 is the duration, s, of the fire extinguishing gas blown by the fire extinguishing gas blowing device. C h The specific heat capacity of the activated carbon is kJ/(kg-DEG C). M h Kg is the amount of activated carbon to be cooled. Δ t h Is the target of active carbon temperature reduction. C n kJ/(kg. DEG C.) is the specific heat capacity of the fire extinguishing gas. ρ n is the density of the extinguishing gas, kg/m 3 。Δt n The temperature of the fire extinguishing gas is increased after the fire extinguishing gas is extinguished and cooled. S 1 Is the sectional area of the spray hole m of the fire extinguishing gas spraying device 2 。v 1 The flow velocity of the fire extinguishing gas sprayed by the fire extinguishing gas spraying and blowing device is m/s. k is a radical of 1 The value is 1.5-2 for the safety factor.
Example 19
Example 18 was repeated except that the thermal imaging camera 1 was connected to a data processing module a1, the data processing module a1 was connected to the main process computer control system a2, and the fire suppressing gas valves 401 of the fire suppressing gas blowing device 4 were connected to the main process computer control system a 2. When the thermal imaging image is judged to have a high temperature point, the data processing module A1 gives an alarm to the main process computer control system A2, and the main process computer control system A2 realizes the fire extinguishing and temperature reducing treatment on the corresponding high-temperature material by controlling the operation of the fire extinguishing gas valve 401.
Example 20
Example 17 was repeated except that the spontaneous combustion activated carbon extinction cooling device was a cooling water spraying device 5. The cooling water spraying device 5 is arranged on an end plate at the tail part of the vibrating screen 2. A cooling water valve 501 is arranged on the cooling water spraying device 5.
As shown in fig. 13, in step 2b), when it is judged that the thermographic image has a high temperature point, the current time t0 is recorded. Starting from the time t0, the cooling water valve 501 of the cooling water spraying device 5 is opened, and the cooling water spraying device 5 sprays water to the corresponding high-temperature material for cooling. After the cooling water spraying device 5 sprays water to the high-temperature material for the duration time t2, the cooling water valve 501 is closed, and the high-temperature material achieves the effect of extinguishing and cooling. Wherein the duration t2 of the cooling water spraying device 5 spraying water satisfies the following relation:
wherein: t2 is the duration of time, s, for which the cooling water spray device sprays water. C h The specific heat capacity of the activated carbon is kJ/(kg-DEG C). M h Kg is the amount of activated carbon to be cooled. Δ t h Is the target of cooling the activated carbon at the temperature. C w1 kJ/(kg. DEG C.) is the specific heat capacity of water at the evaporation temperature. C w2 The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C.). T is w1 The evaporation temperature of water, DEG C. Rho w Density of cooling water, kg/m 3 。T w2 Is the initial temperature of the water sprayed by the cooling water spraying device. h is w Is the latent heat of vaporization of water at the evaporation temperature, kJ/kg. S 2 Is the cross-sectional area of the spray hole of the cooling water spray device, m 2 。v 2 The flow rate of the water sprayed from the cooling water spray device is m/s. k is a radical of 2 The value is 1.2-1.9 for safety factor.
Example 21
Example 20 was repeated except that the thermal imager 1 was connected to a data processing module a1, the data processing module a1 was connected to the main process computer control system a2, and the cooling water valve 501 of the cooling water spray device 5 was connected to the main process computer control system a 2. When the thermal imaging image is judged to have a high temperature point, the data processing module A1 gives an alarm to the main process computer control system A2, and the main process computer control system A2 realizes the fire extinguishing and temperature reduction treatment on the corresponding high-temperature material by controlling the operation of the cooling water valve 501.
Application example 1
A method for extinguishing fires and cooling activated carbon on a vibrating screen, using the system of embodiment 8, the method comprising the steps of:
1) the thermal imaging instrument 1 shoots materials entering a first imaging area 301 at the tail part of the vibrating screen 2 in real time to obtain a primary thermal imaging image;
2) and analyzing and judging whether the material entering the imaging area 3 has a high temperature point according to the primary thermal imaging image:
the maximum temperature value T1 in the primary thermographic image is obtained as 391 ℃, and this maximum temperature value T1 is compared with the set target temperature T0. T0 has a value of 390 ℃. Since T1 > T0, the primary thermographic image is judged to have a suspected high temperature point.
The thermal imaging system 1 tracks and shoots a secondary thermal imaging image of the material at the suspected high-temperature point entering the second imaging area 302 at the tail part of the vibrating screen 2, and further judges whether the suspected high-temperature point is a high-temperature point:
dividing the secondary thermal imaging image into nine-grid squares, obtaining the highest temperature of each of the 9 areas, selecting the highest temperature value T2 of the 9 highest temperatures to be 388 ℃, and comparing the highest temperature value T2 with the set target temperature T0. Since T2 < T0, the suspected high temperature point is determined to be a false high temperature point. Repeat step 1).
Application example 2
A method for extinguishing fires and cooling activated carbon on a vibrating screen, using the system of embodiment 8, the method comprising the steps of:
1) the thermal imaging instrument 1 shoots materials entering a first imaging area 301 at the tail part of the vibrating screen 2 in real time to obtain a primary thermal imaging image;
2) and analyzing and judging whether the material entering the imaging area 3 has a high temperature point according to the primary thermal imaging image:
the maximum temperature value T1 in the primary thermal imaging image is acquired as 420 ℃, and the maximum temperature value T1 is compared with the set target temperature T0. The value of T0 was 418 ℃. Since T1 > T0, the primary thermographic image is judged to have a suspected high temperature point.
The thermal imaging system 1 tracks and shoots a secondary thermal imaging image of the material at the suspected high-temperature point entering the second imaging area 302 at the tail part of the vibrating screen 2, and further judges whether the suspected high-temperature point is a high-temperature point:
dividing the secondary thermal imaging image into nine-grid squares, obtaining the highest temperature of each of the 9 areas, selecting the highest temperature value T2 of the 9 highest temperatures as 420 ℃, and comparing the highest temperature value T2 with a set target temperature T0. Since T2 > T0, the suspected high temperature point was confirmed to be a high temperature point.
The highest temperature value T2 corresponds to the area on the secondary thermal imaging image, so that the found position of the material at the high temperature point in the second imaging area 302 at the tail part of the vibrating screen 2 is determined, and the material at the high temperature point is subjected to fire extinguishing and temperature reduction treatment by the spontaneous combustion activated carbon extinguishing and cooling device arranged at the tail part of the vibrating screen 2.
The spontaneous combustion active carbon extinguishing cooling device is a fire extinguishing gas blowing device. The fire extinguishing gas is nitrogen. When it is judged that the thermal imaging image has a high temperature point, the current time t0 is recorded. From the time t0, the fire extinguishing gas valve 401 of the fire extinguishing gas blowing device 4 is opened, and the fire extinguishing gas blowing device 4 blows the fire extinguishing gas to the corresponding high-temperature material. After the fire extinguishing gas is blown by the fire extinguishing gas blowing device 4 for the duration time t1, the fire extinguishing gas valve 401 is closed, and the high-temperature material achieves the effect of extinguishing and cooling. Wherein the duration t1 of the fire extinguishing gas blowing by the fire extinguishing gas blowing device 4 satisfies the following relational expression:
wherein: t1 is the duration, s, of the fire extinguishing gas blown by the fire extinguishing gas blowing device. C h Is the specific heat capacity of activated carbon, C h ＝0.84kJ/(kg·℃)。M h Amount of activated carbon to be cooled, M h ＝0.5kg。Δt h Δ t as a target for the temperature reduction of activated carbon h ＝60℃。C n Specific heat capacity of extinguishing gas, C n ＝1.30kJ/(kg·℃)。ρ n Density of extinguishing gas, p n ＝1.25kg/m 3 。Δt n For extinguishing fireTemperature, delta t, of gas after extinguishing a fire and cooling n ＝35℃。S 1 Is the total cross-sectional area, S, of the orifices of the extinguishing gas blowing device 1 ＝1.6×10 -3 m 2 ，v 1 Velocity of flow v of extinguishing gas to be sprayed out of the extinguishing gas spraying device 1 100 m/s. The nozzle is 2 double-sided air knives with length of 0.2m and hole width of 2mm, k 1 For safety factor, the value is 1.7.
Application example 3
A method for extinguishing fires and cooling activated carbon on a vibrating screen using the system of example 11, the method comprising the steps of:
1) the thermal imaging instrument 1 shoots materials entering a first imaging area 301 at the tail part of the vibrating screen 2 in real time to obtain a primary thermal imaging image;
2) and analyzing and judging whether the material entering the imaging area 3 has a high temperature point according to the primary thermal imaging image:
the maximum temperature value T1 in the primary thermal imaging image is obtained as 422 ℃, and the maximum temperature value T1 is compared with the set target temperature T0. The value of T0 was 418 ℃. Since T1 > T0, the primary thermographic image is judged to have a suspected high temperature point.
The thermal imaging system 1 tracks and shoots a secondary thermal imaging image of the material at the suspected high-temperature point entering the second imaging area 302 at the tail part of the vibrating screen 2, and further judges whether the suspected high-temperature point is a high-temperature point:
dividing the secondary thermal imaging image into nine-grid squares, obtaining the highest temperature of each of the 9 areas, selecting 423 ℃ as the highest temperature value T2 of the 9 highest temperatures, and comparing the highest temperature value T2 with a set target temperature T0. Since T2 > T0, the suspected high temperature point was confirmed to be a high temperature point.
The highest temperature value T2 corresponds to the area on the secondary thermal imaging image, so that the found position of the material at the high temperature point in the second imaging area 302 at the tail part of the vibrating screen 2 is determined, and the material at the high temperature point is subjected to fire extinguishing and temperature reduction treatment by the spontaneous combustion activated carbon extinguishing and cooling device arranged at the tail part of the vibrating screen 2.
The spontaneous combustion activated carbon extinguishing cooling device is a cooling water spraying device. When it is judged that the thermal imaging image has a high temperature point, the current time t0 is recorded. Starting from the time t0, the cooling water valve 501 of the cooling water spraying device 5 is opened, and the cooling water spraying device 5 sprays water to the corresponding high-temperature material to reduce the temperature. After the cooling water spraying device 5 sprays water to the high-temperature material for the duration time t2, the cooling water valve 501 is closed, and the high-temperature material achieves the effect of extinguishing and cooling. Wherein the duration t2 of the cooling water spraying device 5 spraying water satisfies the following relation:
wherein: t2 is the duration of cooling water spray, s. C h Is the specific heat capacity of activated carbon, C h ＝0.84kJ/(kg·℃)。M h Amount of activated carbon to be cooled, M h ＝0.5kg。Δt h For activated carbon cooling target, Δ t h ＝80℃。C w1 Specific heat capacity of water at evaporation temperature, C w1 ＝4.22kJ/(kg·℃)。C w2 Specific heat capacity of water at initial temperature, C w2 ＝4.191kJ/(kg·℃)。T w1 Is the evaporation temperature of water, T w1 ＝100℃。ρ w As density of cooling water, p w ＝999.7kg/m 3 。T w2 Initial temperature, T, of water sprayed for cooling water spray device w2 ＝10℃。h w The latent heat of vaporization of water at the evaporation temperature, h w ＝2256.6kJ/kg。S 2 Is the cross-sectional area of the spray hole of the cooling water spray device, S 2 ＝1.77×10 -6 m 2 ，v 2 Flow rate of water sprayed to cooling water spray device, v 2 8 m/s. The nozzles are 1 atomizing nozzle with the diameter of the spray hole of 1.5mm, k 2 For safety factor, the value is 1.5.
Claims (13)
1. A method for extinguishing fire and reducing temperature by active carbon on a vibrating screen comprises the following steps:
1) a cover plate (201) is arranged on the vibrating screen (2), and materials entering the vibrating screen (2) move along the length direction of the vibrating screen (2); the thermal imaging instrument (1) shoots materials entering the tail imaging area (3) of the vibrating screen (2) in real time to obtain a thermal imaging image;
1a) a light shield (6) is arranged on a cover plate (201) at the tail part of the vibrating screen (2), and the thermal imager (1) is arranged at the top of the light shield (6); the method comprises the following specific steps:
1b) taking the connecting position of the thermal imaging camera (1) and the light shield (6) as a base point, and reciprocating swinging the thermal imaging camera (1) around the base point; the thermal imaging instrument (1) shoots materials entering a first imaging area (301) and/or a second imaging area (302) at the tail part of the vibrating screen (2) in real time to obtain a primary thermal imaging image and/or a secondary thermal imaging image
2) Analyzing and judging whether the material entering the imaging area (3) has a high temperature point or not according to the thermal imaging image; the method specifically comprises the following steps:
the thermal imaging instrument (1) shoots materials entering a first imaging area (301) at the tail part of the vibrating screen (2) in real time to obtain a primary thermal imaging image; acquiring a highest temperature value T1 in a primary thermal imaging image, and comparing the highest temperature value T1 with a set target temperature T0; if T1 is not more than T0, judging that the primary thermal imaging image does not have a high temperature point, and repeating the step 1); if T1 is greater than T0, the primary thermal imaging image is judged to have a suspected high temperature point;
when the suspected high-temperature point is found in the primary thermal imaging image, the thermal imaging instrument (1) tracks and shoots a secondary thermal imaging image of the material at the suspected high-temperature point entering a second imaging area (302) at the tail of the vibrating screen (2), and further judges whether the suspected high-temperature point is the high-temperature point;
dividing the secondary thermal imaging image into n areas, obtaining the highest temperature of each of the n areas, selecting the highest temperature value T2 of the n highest temperatures, and comparing the highest temperature value T2 with a set target temperature T0; if T2 is not more than T0, judging the suspected high temperature point as a false high temperature point, and repeating the step 1); if T2 is greater than T0, confirming that the suspected high temperature point is a high temperature point; determining and recording the found position of the material at the high temperature point in a second imaging area (302) on the vibrating screen (2) through the area of the highest temperature value T2 corresponding to the secondary thermal imaging image;
2a) if the thermal imaging image does not have the high temperature point, repeating the step 1);
2b) if the thermal imaging image is judged to have a high temperature point, the material at the high temperature point is subjected to fire extinguishing and cooling treatment through a spontaneous combustion activated carbon extinguishing cooling device arranged at the tail part of the vibrating screen (2);
the imaging zone (3) comprises a first imaging zone (301) and a second imaging zone (302); at the end of the shaker (2), the first imaging zone (301) is located upstream of the second imaging zone (302).
2. The method of claim 1, wherein: the spontaneous combustion active carbon extinguishing cooling device is a fire extinguishing gas blowing device (4); the fire extinguishing gas blowing device (4) is arranged on an end plate at the tail part of the vibrating screen (2); the fire extinguishing gas blowing device (4) is provided with a fire extinguishing gas valve (401).
3. The method of claim 2, wherein: in step 2b), when the thermal imaging image is judged to have a high temperature point, recording the current time t 0; starting from the moment t0, opening a fire extinguishing gas valve (401) of a fire extinguishing gas blowing device (4), and blowing fire extinguishing gas to the corresponding high-temperature material by the fire extinguishing gas blowing device (4); after the fire extinguishing gas is sprayed by the fire extinguishing gas spraying and blowing device (4) for a duration t1, closing the fire extinguishing gas valve (401), and enabling the high-temperature materials to achieve the effect of extinguishing and cooling; wherein the duration t1 of the fire extinguishing gas blowing by the fire extinguishing gas blowing device (4) satisfies the following relational expression:
wherein: t1 is the duration, s, of the fire extinguishing gas blown by the fire extinguishing gas blowing device; c h Is the specific heat capacity of the activated carbon, kJ/(kg. DEG C); m h Kg of the amount of activated carbon to be cooled; Δ t h The temperature of the active carbon is reduced to the target value of DEG C; c n kJ/(kg. DEG C) which is the specific heat capacity of the fire extinguishing gas; rho n Density of extinguishing gas, kg/m 3 ；Δt n The temperature of the fire extinguishing gas is increased after the fire extinguishing gas is extinguished and cooled; s 1 Is the sectional area of the spray hole m of the fire extinguishing gas spraying device 2 ；v 1 The flow speed of the fire extinguishing gas sprayed out by the fire extinguishing gas spraying and blowing device is m/s; k is a radical of 1 The value is 1.5-2 for the safety factor.
4. The method of claim 1, wherein: the spontaneous combustion activated carbon extinguishing cooling device is a cooling water spraying device (5); the cooling water spraying device (5) is arranged on an end plate at the tail part of the vibrating screen (2); a cooling water valve (501) is arranged on the cooling water spraying device (5).
5. The method of claim 4, wherein: in step 2b), when the thermal imaging image is judged to have a high temperature point, recording the current time t 0; starting from the time t0, opening a cooling water valve (501) of a cooling water spraying device (5), and spraying water to the corresponding high-temperature material by the cooling water spraying device (5) for cooling; after the cooling water spraying device (5) sprays water to the high-temperature materials for a duration t2, the cooling water valve (501) is closed, and the high-temperature materials achieve the effect of quenching; wherein the duration t2 of the water spray of the cooling water spray device (5) satisfies the following relational expression:
wherein: t2 is the duration of time, s, for which the cooling water spray device sprays water; c h The specific heat capacity of the activated carbon is kJ/(kg DEG C); m h Kg of the amount of activated carbon to be cooled; Δ t h The temperature of the active carbon is reduced to a target value; c w1 The specific heat capacity of water at the evaporation temperature, kJ/(kg. DEG C); c w2 The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C); t is w1 The evaporation temperature of water, DEG C; rho w Density of cooling water, kg/m 3 ；T w2 The initial temperature of the water sprayed by the cooling water spraying device is DEG C; h is w Is the latent heat of vaporization of water at the evaporation temperature, kJ/kg; s 2 For spraying cooling waterCross-sectional area of spray hole m of the spray device 2 ；v 2 The flow speed of water sprayed by the cooling water spraying device is m/s; k is a radical of 2 The value is 1.2-1.9 for safety factor.
6. The method of claim 1, wherein: the value range of T0 is 390-425 ℃.
7. The method of claim 2, wherein: the value range of T0 is 400-420 ℃.
8. The method of claim 1, wherein: the top of the light shield (6) is also provided with a dustproof cooling protective cover (7); the thermal imaging camera (1) is arranged in the dustproof cooling protective cover (7); the connection position of the dustproof cooling protection cover (7) and the light shield (6) is used as a base point, and the thermal imaging system (1) and the dustproof cooling protection cover (7) swing back and forth around the base point.
9. The method of claim 8, wherein: and a cooling medium is introduced into the dustproof cooling protective cover (7), and is sprayed out of the dustproof cooling protective cover (7) into the light shield (6).
10. The method of claim 9, wherein: the cooling medium is one of compressed air, water and nitrogen.
11. The method of claim 8, wherein: and a black coating is arranged on the inner wall of the light shield (6).
12. The method of claim 1, wherein: a cover plate (201) of the vibrating screen (2) is provided with an opening; the light shield (6) is positioned at the upper part of the opening; the width of the opening is equal or basically equal to the width of the vibrating screen (2); and/or
A dust removal air port (8) is also arranged on the cover plate (201) of the vibrating screen (2); the dust removal air port (8) is positioned at the upstream of the light shield (6); the dust removal device removes dust for the materials on the vibrating screen (2) through the dust removal air port (8).
13. The method according to any one of claims 1-12, wherein: the thermal imager (1) is connected with a data processing module (A1), the data processing module (A1) is connected with a main process computer control system (A2), and meanwhile, a fire extinguishing gas valve (401) of a fire extinguishing gas blowing device (4) or a cooling water valve (501) of a cooling water spraying device (5) is connected with the main process computer control system (A2); when the thermal imaging image is judged to have a high-temperature point, the data processing module (A1) gives an alarm to the main process computer control system (A2), and the main process computer control system (A2) realizes the fire extinguishing and temperature reduction treatment on the corresponding high-temperature material by controlling the operation of the fire extinguishing gas valve (401) or the cooling water valve (501).
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