CN112624112A - Method and system for detecting high-temperature activated carbon and cooling blanking channel - Google Patents

Method and system for detecting high-temperature activated carbon and cooling blanking channel Download PDF

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CN112624112A
CN112624112A CN202110026462.0A CN202110026462A CN112624112A CN 112624112 A CN112624112 A CN 112624112A CN 202110026462 A CN202110026462 A CN 202110026462A CN 112624112 A CN112624112 A CN 112624112A
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activated carbon
cooling water
temperature
gas
cooling
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CN112624112B (en
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刘雁飞
周浩宇
陈思墨
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Hunan Zhongye Changtian Energy Conservation And Environmental Protection Technology Co ltd
Zhongye Changtian International Engineering Co Ltd
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Hunan Zhongye Changtian Energy Conservation And Environmental Protection Technology Co ltd
Zhongye Changtian International Engineering Co Ltd
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    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/354—After-treatment
    • C01B32/36—Reactivation or regeneration
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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Abstract

A method for detecting high-temperature activated carbon and cooling a blanking channel comprises the following steps: 1) the thermal imager shoots the material entering the imaging area in real time to obtain a thermal imaging picture; 2) analyzing whether the material entering the imaging area has a high temperature point or not according to the thermal imaging graph; 2a) if the area does not have the high temperature point, repeating the step 1); 2b) if the area has a suspected high temperature point, recording the found position of the material at the high temperature point in a second detection area on the vibrating screen and giving an alarm; 3) and according to the found position of the material at the high-temperature point in the second detection area on the vibrating screen, extinguishing the fire and reducing the temperature of the material at the position on the screen by using an activated carbon channel. According to the invention, the high-temperature activated carbon is detected in the screening step of the activated carbon flue gas purification device and is processed at the position of the on-screen activated carbon channel, so that the high-temperature activated carbon is found and cooled in time, the problem that the high-temperature activated carbon is difficult to detect comprehensively is solved, and the safety of the system is improved.

Description

Method and system for detecting high-temperature activated carbon and cooling blanking channel
Technical Field
The invention relates to detection and treatment of high-temperature activated carbon particles in an activated carbon flue gas purification device, in particular to a method and a system for high-temperature detection of activated carbon and cooling of a blanking channel, and belongs to the technical field of activated 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 SO2、NOX(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 figure 1: raw flue gas (main component of pollutant is SO) generated in sintering process2) 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 gas2) 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). The high-temperature activated carbon particles are discharged from the desorption tower and then contact with air, spontaneous combustion (smoldering and flameless) can occur, a small amount of high-temperature activated carbon particles of the spontaneous combustion can possibly ignite low-temperature activated carbon particles around the high-temperature activated carbon particles, the high-temperature activated carbon particles of the spontaneous combustion can enter each link of the flue gas purification device along with the circulation of the activated carbon, the safe and stable operation of the sintering activated carbon flue gas purification system is threatened, and the sintering activated carbon flue gas purification device has the requirement of detecting and disposing the high-temperature spontaneous combustion activated carbon particles. 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 provides a method and a system for detecting the high temperature of activated carbon and cooling a blanking channel. According to the invention, the thermal imager is arranged above the vibrating screen cover plate of the activated carbon flue gas purification device, the thermal imager firstly shoots materials entering an imaging area to obtain a thermal imaging image, then analyzes and judges whether the materials have high temperature points or not, records the found positions of the materials at the high temperature points in the imaging area, and then extinguishes and cools the detected high temperature materials through the activated carbon extinguishing and cooling device arranged on the on-screen activated carbon channel between the vibrating screen and the conveyor. According to the technical scheme provided by the invention, the spontaneous combustion or high-temperature activated carbon is detected in the vibration screening link of the activated carbon flue gas purification device, and can be positioned and processed in time, so that the high-temperature spontaneous combustion of the activated carbon in subsequent processes is avoided, 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 detecting high-temperature activated carbon and cooling at a blanking channel is provided.
A method for detecting high-temperature activated carbon and cooling a blanking channel comprises the following steps:
1) the method comprises the following steps that materials enter a vibrating screen, and a thermal imager shoots the materials entering a first detection area on the vibrating screen in real time to obtain a primary thermal imaging graph;
2) analyzing and judging whether the material entering the first detection area has a high temperature point or not according to the primary thermal imaging image;
2a) if the primary thermal imaging image is judged not to have the high temperature point, repeating the step 1);
2b) if the primary thermal imaging image is judged to have the suspected high-temperature point, performing step 3);
3) a thermal imaging instrument tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering a second detection area on the vibrating screen, and further judges whether the suspected high-temperature point is a high-temperature point;
3a) if the suspected high temperature point is a false high temperature point, repeating the step 1);
3b) if the suspected high-temperature point is determined as the high-temperature point, recording the found position of the material at the high-temperature point in a second detection area on the vibrating screen and giving an alarm;
4) the activated carbon extinguishing and cooling device arranged at the position of the activated carbon channel on the screen between the vibrating screen and the conveyor extinguishes and cools the detected high-temperature material.
Wherein the first detection zone is located upstream of the second detection zone on the shaker screen.
In the invention, in the step 4), the activated carbon extinguishing and cooling device is a gas blowing device; the fire extinguishing and cooling treatment comprises the following steps: the gas blowing device arranged on the active carbon channel on the screen blows the fire extinguishing gas to the detected high-temperature material, thereby realizing the extinguishing and cooling of the high-temperature material.
Preferably, in the fire extinguishing and temperature reducing process according to step 4), the mass flow rate of the fire extinguishing gas blown by the gas blowing device satisfies the following relational expression:
Figure BDA0002890389280000031
wherein: LL (LL)NThe flow of the fire extinguishing gas which is blown in the quenching and cooling treatment process of the active carbon is kg/s. ChtThe specific heat capacity of the activated carbon is kJ/(kg-DEG C). LL (LL)htThe flow rate of the activated carbon to be quenched and cooled is kg/s. Delta ThtIn order to adopt the fire extinguishing gas to extinguish the temperature of the active carbon in the cooling process, the temperature is higher than the temperature of the active carbon. Delta TNThe temperature of the fire extinguishing gas is increased after the fire extinguishing gas is extinguished and cooled. CNkJ/(kg. DEG C.) is the specific heat capacity of the fire extinguishing gas. KN1Ratio of fire suppressing gas to active carbon cooling, KN1＜1。KN2For the participation of extinguishing gas in the cooling process of activated carbon, KN2＜1。
In the fire extinguishing and temperature reducing treatment of the step 4), the mass flow rate of the cooling water sprayed by the cooling water spraying device satisfies the following relational expression:
Figure BDA0002890389280000032
wherein: LL (LL)H1The flow of cooling water sprayed in the quenching and cooling process of the active carbon is kg/s. ChtThe specific heat capacity of the activated carbon is kJ/(kg-DEG C). LL (LL)htThe flow rate of the activated carbon to be quenched and cooled is kg/s. Delta Tht1In order to quench the target temperature of the active carbon in the cooling process by using cooling water, the temperature is controlled. CH1The specific heat capacity of water at the evaporation temperature, kJ/(kg. DEG C.). T ise1The evaporation temperature of water, DEG C. T ise2The initial temperature of the cooling water is DEG C. CH2The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C.). h ishzIs the latent heat of vaporization of water at the evaporation temperature, kJ/kg.
In the invention, in the step 4), the activated carbon extinction cooling device comprises an activated carbon extinction device and an activated carbon cooling device. Wherein, the active carbon extinguishing device is a gas blowing device. The active carbon cooling device is a cooling water spraying device. The fire extinguishing and cooling treatment comprises the following steps: the extinguishing treatment of the high-temperature materials is completed by blowing the detected high-temperature materials through the gas blowing device arranged on the on-screen activated carbon channel, and the cooling water is sprayed on the detected high-temperature materials through the cooling water spraying device arranged on the on-screen activated carbon channel to complete the cooling treatment of the high-temperature materials.
Preferably, in the fire extinguishing and temperature reducing treatment in step 4), the gas spraying device sprays fire extinguishing gas to the detected high-temperature material, and the cooling water spraying device sprays cooling water to the detected high-temperature material. Wherein the flow rate V of the fire extinguishing gas blown by the gas blowing deviceNThe following formula is satisfied:
Figure BDA0002890389280000033
in the formula: vNThe flow of the fire extinguishing gas, m, blown in the process of extinguishing the activated carbon3/s。STIs the cross-sectional area of the activated carbon channel on the sieve, m2。L2Is the height difference m between the nozzle position of the gas injection device and the nozzle position of the cooling water spraying device. t is ti0And (4) the time, s, for the high-temperature material to move from the detected high-temperature point position to the nozzle position of the gas injection device.
Water spray quantity LL of cooling water spraying deviceH2The following formula is satisfied:
Figure BDA0002890389280000034
in the formula: LL (LL)H2The flow rate of cooling water sprayed in the cooling treatment process of the active carbon is kg/s. ChtThe specific heat capacity of the activated carbon is kJ/(kg-DEG C). LL (LL)htThe flow rate of the activated carbon to be cooled is kg/s. Delta Tht2Is the target of active carbon temperature reduction. CH1The specific heat capacity of water at the evaporation temperature, kJ/(kg. DEG C.). T ise1The evaporation temperature of water, DEG C. T ise2The initial temperature of the cooling water is DEG C. CH2The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C.). h ishzIs the latent heat of vaporization of water at the evaporation temperature, kJ/kg.
Preferably, the vibrating screen is provided with a cover plate, and the material entering the vibrating screen moves along the length direction of the vibrating screen.
The thermal imager shoots the material entering the first detection area in real time in the step 1) to obtain a primary thermal imaging diagram, which specifically comprises the following steps:
1a) the cover plate of the vibrating screen is provided with an opening, the observation device is arranged above the opening and covers the opening, the thermal imager is arranged above the cover plate, and the observation device is positioned between the cover plate and the thermal imager;
1b) the thermal imaging system shoots the material entering the first detection area on the vibrating screen in real time through the observation device and the opening hole to obtain a thermal imaging image.
Preferably, in step 3), the thermal imaging instrument tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering the second detection area, specifically:
the thermal imaging instrument reciprocates in a vertical plane around the observation device, and detects the material entering a suspected high-temperature point in a second detection area on the vibrating screen through the observation device to obtain a secondary thermal imaging graph.
Preferably, in step 3), judging whether the suspected high temperature point is a high temperature point according to the secondary thermal imaging map, specifically:
dividing the secondary imaging graph 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. And if the T2 is less than or equal to T0, the suspected high temperature point is a false high temperature point. And if T2 is greater than T0, confirming that the suspected high temperature point is the high temperature point. And the highest temperature value T2 corresponds to an area on a secondary thermal imaging graph, so that the found position of the material at the high temperature point in a second detection area on the vibrating screen is determined and an alarm is given.
According to a second embodiment of the invention, a system for high temperature activated carbon detection and cooling at a blanking channel is provided.
The system comprises a thermal imaging instrument, a vibrating screen, an active carbon extinguishing cooling device, an on-screen active carbon channel and a conveyor. And an oversize activated carbon outlet of the vibrating screen is connected with a feed inlet of the conveyor through an oversize activated carbon channel. The vibrating screen is provided with a cover plate. The thermal imaging camera is arranged above the vibrating screen cover plate. An imaging area is arranged on the vibrating screen. The imaging zone includes a first detection zone and a second detection zone. On the shaker, the first detection zone is located upstream of the second detection zone. The activated carbon extinguishing cooling device is arranged on the activated carbon channel on the screen.
In the invention, the activated carbon extinguishing and cooling device is a gas blowing device. The gas blowing device comprises a gas conveying main pipe, a gas conveying branch pipe and a gas nozzle. The gas delivery main pipe is arranged outside the activated carbon channel on the screen. The gas delivery branch pipe is arranged on the active carbon channel on the sieve. One end of the gas delivery branch pipe is connected with the gas delivery main pipe, and the other end of the gas delivery branch pipe extends into the active carbon channel on the screen. The tail end of the gas conveying branch pipe is provided with a gas nozzle. Preferably, the gas delivery main pipe is provided with a gas valve for controlling the opening and closing of the gas blowing device.
Preferably, the number of gas delivery branches is a plurality, preferably 2 to 30, more preferably 3 to 16. Each gas conveying branch pipe is connected with a gas conveying main pipe, and the plurality of gas conveying branch pipes are uniformly distributed along the periphery of the on-screen activated carbon channel. Preferably, the gas nozzles are located at the lower side of the distal end of the gas delivery manifold.
In the invention, the activated carbon extinguishing cooling device is a cooling water spraying device. The cooling water spraying device comprises a cooling water conveying main pipe, a cooling water conveying branch pipe and a cooling water nozzle. The cooling water delivery main pipe is arranged outside the active carbon channel on the screen. The cooling water conveying branch pipe is arranged on the active carbon channel on the screen. One end of the cooling water delivery branch pipe is connected with the cooling water delivery main pipe, and the other end of the cooling water delivery branch pipe extends into the active carbon channel on the screen. The tail end of the cooling water conveying branch pipe is provided with a cooling water nozzle. Preferably, a cooling water valve is arranged on the cooling water delivery main pipe and controls the cooling water spraying device to be opened and closed.
Preferably, the number of the cooling water delivery branch pipes is plural, preferably 2 to 30, more preferably 3 to 16. Each cooling water conveying branch pipe is connected with a cooling water conveying main pipe, and the cooling water conveying branch pipes are uniformly distributed along the periphery of the on-screen activated carbon channel. Preferably, the cooling water nozzles are located at the lower side of the distal ends of the cooling water delivery branch pipes.
In the invention, the activated carbon extinguishing cooling device comprises an activated carbon extinguishing device and an activated carbon cooling device. Wherein, the active carbon extinguishing device is a gas blowing device arranged on the active carbon channel on the screen. The active carbon cooling device is a cooling water spraying device arranged on the active carbon channel on the screen.
Preferably, the cooling water supply branch pipe of the cooling water spraying device is disposed below the gas supply branch pipe of the gas blowing device.
Preferably, the system further comprises a viewing device disposed above the shaker deck between the shaker deck and the thermal imaging camera. The viewing device includes a sidewall shield, a top viewing aperture and a bottom viewing aperture. The top observation hole is defined by the top edge of the side wall cover body. The area enclosed by the bottom edge of the side wall cover body is the bottom observation hole. Preferably, the cover plate of the vibrating screen is provided with an opening, and the bottom observation hole of the observation device is equal to the opening in the cover plate in size and is superposed with the opening in the cover plate in position. Preferably, the width of the openings is equal or substantially equal to the width of the vibrating screen.
The thermal imaging system moves back and forth in a vertical plane around the observation device, and shoots materials entering a first detection area and/or a second detection area on the vibrating screen in real time through the observation device to obtain a primary thermal imaging diagram and/or a secondary thermal imaging diagram.
Preferably, the bottom of the observation device is further provided with a front partition plate and a rear partition plate, the two partition plates are both positioned at the bottom of the side wall cover body, the front partition plate is positioned at the upstream side of the bottom observation hole, and the rear partition plate is positioned at the downstream side of the bottom observation hole.
Preferably, the front and rear diaphragms are movable in relation to each other in the plane of the bottom viewing aperture along the length of the shaker screen in response to a change in the position of the thermal imaging camera in a reciprocating motion about the viewing means in a vertical plane. Preferably, the center of the gap between the front and rear partition plates is aligned with the center of the top observation hole and the thermal imaging camera.
Preferably, the system further comprises a data processing module and a control system. The thermal imager is connected with a data processing module, and the data processing module is connected with a control system. Meanwhile, a gas valve of the gas injection device and/or a cooling water valve of the cooling water spraying device are/is connected with the control system. The control system controls the operation of the data processing module, the thermal imager, the gas valve 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.
After the thermal imaging appearance detected high temperature active carbon, the processing mode safe relatively mainly includes: 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 activated carbon; after the spontaneous combustion activated carbon particles are extinguished, if the spontaneous combustion activated carbon particles are continuously kept at a high temperature above the ignition point, spontaneous combustion can occur in the presence of air, so that the spontaneous combustion activated carbon particles need to be safely disposed, and then the spontaneous combustion activated carbon particles need to be extinguished and cooled.
In the application, a method for detecting high-temperature activated carbon and cooling a blanking channel is provided. In the method, a thermal imager firstly shoots materials in an imaging area on a 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 on the vibrating screen. When the thermal imaging image is judged to have a high-temperature point, the detected high-temperature material is subjected to air injection and/or water spray cooling treatment through the activated carbon extinguishing cooling device arranged on the blanking channel, so that the high-temperature material is extinguished and cooled.
In the invention, the method for extinguishing fire and reducing temperature by using the active carbon on the vibrating screen mainly comprises three treatment schemes. In a first processing scheme, the activated carbon extinguishing and cooling device is a gas blowing device. The scheme adopts nitrogen and CO2Inert 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, the desorption tower needs to use a large amount of nitrogen, 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 nearby2Gas-generating and gas-storing apparatus, e.g. CO produced during high-temperature calcination of limestone (or dolomite)2Then the use of CO is also contemplated2Used as a cooling medium to extinguish fire and reduce temperature. The invention arranges the gas injection device at the position of the active carbon blanking channel, namely the gas injection device is arranged at the position of the active carbon channel on the screen between the vibrating screen and the conveyor, when the thermal imager detects that the vibrating screen has high-temperature materials, the gas injection device immediately opens the gas valve to form a fire extinguishing gas atmosphere,the corresponding high-temperature materials are sprayed with fire extinguishing gas to extinguish fire and reduce temperature, thereby avoiding the situation that peripheral materials are ignited due to untimely treatment and ensuring the safe and stable operation of the system. In the present invention, the mass flow rate of the fire extinguishing gas blown by the gas blowing device satisfies the following relational expression in terms of the heat balance between the activated carbon and the fire extinguishing gas:
Figure BDA0002890389280000071
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)ht30 ℃ 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, the temperature of the extinguishing gas is Delta TN125-25-100 ℃. In the formula 1, KN1Ratio of fire suppressing gas to active carbon cooling, KN1＜1；KN2For the participation of extinguishing gas in the cooling process of activated carbon, KN2＜1；KN1And KN2The specific value of (A) can be obtained according to working conditions and experience. LL (LL)htFor the flow of the activated carbon to be extinguished and cooled, the current flow of the activated carbon to be cooled is the same as the flow of the discharging device of the desorption tower at a certain moment in the past, namely LLhtCan be obtained by measuring the flow of the activated carbon in the discharging device of the desorption tower at a certain time in the past. The fire extinguishing gas blowing flow calculated according to the formula 1 ensures that the detected high-temperature activated carbon achieves the extinguishing cooling effect and simultaneously controls the use cost of the fire extinguishing gas. In addition, the blowing time t1 of the gas blowing device can be adjusted according to working conditions and experience, for example, the blowing time of the fire extinguishing gas is more than 2 times of the time of the activated carbon particles moving from the detection finding position to the gas blowing device, and further the effect of extinguishing and cooling is achieved.
In a second treatment scheme, the activated carbon quenching cooling device is coldA water sprinkler. 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 CO2When the specific heat capacity of the gas is large, the temperature reduction range 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. Furthermore, in view of the low cost and ready availability of water, the second treatment option of the present invention employs water as the cooling medium. According to the invention, the cooling water spraying device is arranged at the position of the on-screen activated carbon channel between the vibrating screen and the conveyor, when the thermal imager detects that high-temperature materials exist on the vibrating screen, the cooling water spraying device immediately opens the cooling water valve to spray cooling water to the corresponding high-temperature materials to extinguish fire and reduce 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 present invention, the mass flow rate of the cooling water sprayed by the cooling water spraying device satisfies the following relation in terms of the heat balance between the activated carbon and the cooling water:
Figure BDA0002890389280000072
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 reduced 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 ℃ (for example,. DELTA.T)ht120 c) to ensure that the cooling water is completely converted to water vapour during the cooling process, i.e. liquid water is not carried into the chain bucket, when the cooling water is warmed during the heat exchange process to a water evaporation temperature at the local atmospheric pressure, e.g. 100 c. That is, the invention avoids liquid water from entering the conveyor and even the whole flue gas purification device by accurately controlling the water spraying flow of the cooling water spraying deviceThe neutralization is carried out, SO that the active carbon powder is prevented from being adhered to conveying equipment due to the liquid water in the conveying system, and simultaneously, the SO which is not completely resolved in the liquid water and the active carbon can be prevented2Reaction to form H2SO4And corrodes the transport equipment. The invention adopts water which is low in cost and easy to obtain as a medium for cooling the activated carbon, thereby reducing the use cost and avoiding common technical problems which may occur when the water is used as a cooling medium. In addition, the spraying time period t2 of the cooling water spraying device can be adjusted according to working conditions and experience, for example, the spraying time period of the cooling water is more than 2 times of the time for moving the activated carbon particles from the detection finding position to the cooling water spraying device.
In a third processing scheme, the activated carbon extinguishing cooling device comprises an activated carbon extinguishing device and an activated carbon cooling device. Wherein, the active carbon extinguishing device is a gas blowing device, and the active carbon cooling device is a cooling water spraying device. The invention adopts nitrogen and CO2Inert gas and other gases capable of isolating oxygen are used as flame-retardant gas, after a thermal imager finds a high-temperature point, a gas blowing device blows fire extinguishing gas for flame retardance, and then water is used as a cooling medium to cool high-temperature activated carbon. Generally, burning coal undergoes a water gas reaction when it encounters water. In the application scenario of the present invention, however, the cooling water supply branch of the cooling water spraying device is arranged below the gas supply branch of the gas injection device, i.e. the cooling water spraying holes are arranged in the region below the gas spraying holes. And particularly, in the process of extinguishing and cooling the high-temperature activated carbon, the thermal imager immediately opens the gas valve of the gas spraying device after finding the high-temperature material, the gas spraying device sprays fire extinguishing gas to the spontaneous combustion activated carbon, after the fire extinguishing gas is sprayed for a time period of t3, the cooling water valve of the cooling water spraying device is opened, the cooling water spraying device sprays cooling water (or cooling water mist) to the high-temperature activated carbon, after the cooling water is sprayed for a time period of t4, the cooling water valve is closed, the fire extinguishing gas is sprayed for a time period of t5 from the closing moment of the cooling water valve, and then the gas valve is closed, so that the fire extinguishing and cooling treatment on the high-temperature activated carbon particles is completed. From the aspect of spraying time, the spraying and cooling of the cooling water are completed in the process of spraying the fire extinguishing gasThe spraying of cooling water is carried out under the isolated condition of fire extinguishing gas from the jetting position, so that the cooling water spraying can be ensured to be carried out in an oxygen-free environment, meanwhile, the volume and the range of smoldering or high-temperature activated carbon particles are small, the cooling water can be rapidly extinguished after meeting water, and the condition of continuous water gas reaction is not formed. In addition, compared to nitrogen and CO2And inert gas and the like, water also has the advantages of low cost and easiness in obtaining, so that the scheme adopts the fire extinguishing gas and the water as the cooling medium of the high-temperature activated carbon together, and is a good choice. The blowing periods t3, t4, t5 mentioned here can be adjusted according to the working conditions and experience. For example, the fire extinguishing gas spraying time t3 is 0.5-1 s; the cooling water spraying time period t4 is more than 2 times the time for the activated carbon particles to move from the detection finding position to the cooling water spraying device; after the cooling water stops spraying, the continuous spraying time t5 of the fire extinguishing gas is 0.5-1 s. The fire extinguishing gas spraying time periods t3 and t5 before and after the cooling water is sprayed can ensure that the cooling water is sprayed in an oxygen-free environment, so that the common technical problems which can occur when water is used as a cooling medium are avoided.
In a third process variant, the flow rate V of the extinguishing gas blown by the gas blowing deviceNComprises the following steps:
Figure BDA0002890389280000091
in the formula: vNThe flow of the fire extinguishing gas injected in the extinguishing treatment process of the activated carbon is m3/s；STIs the cross-sectional area of the activated carbon channel on the sieve, m2；L2The height difference m between the nozzle position of the gas injection device and the nozzle position of the cooling water spraying device; t is ti0And (4) the time, s, for the high-temperature material to move from the detected high-temperature point position to the nozzle position of the gas injection device. The flow of the fire extinguishing gas sprayed in the extinguishing process of the activated carbon calculated according to the formula 3 can ensure that smoldering activated carbon particles are isolated from air after reaching an activated carbon blanking channel between the vibrating screen and the conveyor.
According to the heat balance of the active carbon and the cooling water, the mass flow of the cooling water sprayed by the cooling water spraying device can be obtained as follows:
Figure BDA0002890389280000092
generally, the spontaneous combustion or high-temperature activated carbon (about 420 ℃) detected by the thermal imaging system has a higher temperature after being extinguished by the fire extinguishing gas blown by the gas blowing device, and in formula 4, for example, the cooling water amount is considered according to the temperature reduction of the activated carbon by 15-20 ℃ (for example, Δ T)ht215 c) to ensure that the cooling water is completely converted to water vapour during the cooling process, and liquid water is not carried into the chain bucket, when the cooling water is warmed during the heat exchange process to the water evaporation temperature at the local atmospheric pressure, for example 100 c. It can be seen from formula 4 that the present invention prevents liquid water from entering the conveyor or even the whole flue gas purification device by precisely controlling the water spraying amount of the cooling water spraying device, thereby preventing the activated carbon powder from adhering to the conveying equipment due to the liquid water in the conveying system, and simultaneously preventing the incompletely resolved SO in the liquid water and the activated carbon2Reaction to form H2SO4And corrodes the transport equipment. The invention adopts water which is low in cost and easy to obtain as a medium for cooling the activated carbon, reduces the use cost and avoids the technical problem which can occur when the water is used as the cooling medium.
It should be noted that, specifically, in the process of extinguishing and cooling the high-temperature activated carbon, the three schemes all adopt a method of blowing the extinguishing gas and/or spraying the cooling water in advance, the speed of the activated carbon is high in the process of falling in the blanking channel between the vibrating screen and the conveyor, the contact time of the activated carbon with the extinguishing gas and/or the cooling water is short, and the method of blowing the extinguishing gas and/or spraying the cooling water in advance can ensure that the activated carbon has enough time to contact the extinguishing gas and/or the cooling water when passing through the blanking channel, so that the purpose of extinguishing and cooling the high-temperature activated carbon is achieved.
Preferably, the specific high-temperature detection process in the method of the present invention is as follows: firstly, shooting a material entering a first detection area on a vibrating screen to obtain a primary thermal imaging graph; analyzing and judging whether the material entering the first detection area has a suspected high-temperature point or not according to the primary thermal imaging graph; tracking and shooting the material with the suspected high-temperature point in the primary thermal imaging graph to obtain a secondary thermal imaging graph of the material at the suspected high-temperature point entering a second detection area; and analyzing and judging whether the suspected high-temperature point is a high-temperature point or not according to the secondary thermal imaging graph. And when the suspected high-temperature point is confirmed to be the high-temperature point, recording the found position of the material at the high-temperature point in the second detection 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 thermal imaging map with the target temperature T0, it can be determined whether there is a high temperature point in the primary thermal imaging map. If T1 is not more than T0, it is determined that the primary thermal imaging graph does not have a high temperature point, and the thermal imaging instrument continues to perform high temperature detection on the material subsequently entering the first detection area. 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 graph of the material in the second detection area. Dividing the secondary thermal imaging graph into n regions (for example, into nine-square grids), acquiring the highest temperature value T2 in the n regions, and comparing T2 with the target temperature T0 to determine whether the suspected high temperature point is a high temperature point. And if the T2 is not more than T0, judging that the suspected high temperature point is a false high temperature point, and continuously carrying out high temperature monitoring on the material subsequently entering the first detection area by the thermal imager. If T2 is greater than T0, the suspected high temperature point is determined to be a high temperature point, the highest temperature value T2 corresponds to an area on the secondary thermal imaging graph, and therefore the found position of the material at the high temperature point in the second detection area is determined and an alarm is given to the control system. In order to further embody the accuracy or precision of the high-temperature detection, the secondary thermal imaging graph 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 this application, the thermal imaging system sets up in the top of shale shaker apron (thermal imaging system is independent of the shale shaker setting promptly), is equipped with the trompil on the apron of shale shaker, 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. Through the arrangement, although the vibrating screen is simple and convenient, the screen plate of the vibrating screen needs to be provided with the openings with larger sizes. The large size of the opening causes the following problems: 1. because the thermal imager needs to be ensured to image, dust removal cannot be arranged right above the opening, and working dust of the vibrating screen overflows to seriously affect the surrounding environment; 2. the active carbon particles jump out of the vibrating screen in the screening process, so that the loss of the active carbon is increased; 3. foreign matters easily enter the flue gas purification device from the holes of the vibrating screen, and the safe and stable operation of the activated carbon flue gas purification device is influenced.
Aiming at the problems, the invention further optimizes and reduces the size of the opening, and the cover plate of the vibrating screen is provided with a slender opening, and the width of the opening is the same as that of the vibrating screen, so that the thermal imaging camera can detect all the activated carbon flowing through the screen plate of the vibrating screen. Meanwhile, an observation device is arranged on the upper part of the opening of the cover plate of the vibrating screen. The observation device comprises a side wall cover body, wherein observation holes are formed in the upper portion and the bottom of the side wall cover body, namely a top observation hole and a bottom observation hole, the top observation hole is formed in the top end of the side wall cover body, and the bottom observation hole is formed in the bottom end of the side wall cover body. Generally, the bottom observation hole of the observation device is equal in size and coincides with the opening of the vibrating screen cover plate. The observation device can ensure that the optical channel of the thermal imaging instrument for imaging the activated carbon particles on the vibrating screen through the top observation hole and the bottom observation hole is smooth, the height of the observation device can be determined according to experience or adjusted as required, and the constraint condition of the observation device is mainly to ensure that the activated carbon particles cannot jump out of the vibrating screen. Meanwhile, the observation device can play a role in eliminating observation obstacles and optimizing the imaging environment and the imaging background.
According to the invention, the thermal imager reciprocates in a vertical plane around the observation device, so that the material entering the first detection area or the second detection area can be shot in real time through the observation device, a primary thermal imaging graph or a secondary thermal imaging graph is obtained, and the high-temperature detection of the material is more accurately realized. Correspondingly, the observation device also comprises a front partition plate arranged on the upstream side of the bottom observation hole and a rear partition plate arranged on the downstream side of the bottom observation hole. According to the position change of the thermal imaging instrument which makes reciprocating motion around the observation device in a vertical plane, the front partition plate and the rear partition plate synchronously move along the length direction of the vibrating screen in the plane where the bottom observation hole is located, namely the positions of the front partition plate and the rear partition plate in the observation device are adjusted according to the installation position of the thermal imaging instrument. The center of a pore formed among the front clapboard, the rear clapboard and the bottom observation hole, the center of the top observation hole and the thermal imager are positioned on the same straight line. The arrangement of the front partition plate and the rear partition plate can further avoid the problem caused by the large-size observation hole formed in the cover plate of the vibrating screen, reduce the requirement on the dedusting air volume, and simultaneously still meet the requirement of a thermal imager for detecting high-temperature activated carbon particles.
Preferably, in the technical solution of the present application, one or more thermal imaging cameras may be provided. 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 is around viewing device reciprocating motion in vertical plane, and the position of thermal imaging system can move 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 application, the expression "on-screen activated carbon channel" and "blanking channel" are the same meaning and refer to the channel arranged between the on-screen activated carbon outlet of the vibrating screen and the feed inlet of the conveyor.
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.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the thermal imager is adopted to detect the temperature of the activated carbon, the suspected high-temperature point is preliminarily judged, and the suspected high-temperature point is tracked and detected, so that accurate high-temperature point judgment data is obtained, and the detection accuracy is improved.
2. According to the technical scheme provided by the invention, on the basis of identifying the high-temperature activated carbon, the injection amount of the gas injection device and/or the water injection amount of the cooling water spraying device can be accurately controlled, the extinguishing and cooling of the high-temperature activated carbon are realized, the waste is avoided, meanwhile, the liquid water is prevented from being brought into a conveying system, and the safety of the system is improved.
3. In the invention, the position of the thermal imaging instrument can move along with the conveying of the materials on the vibrating screen, which is beneficial to tracking and judging the materials and solves the problem that high-temperature activated carbon particles in the activated carbon flue gas purification device are difficult to detect comprehensively.
4. According to the invention, the observation device is arranged between the vibrating screen cover plate and the thermal imager, so that the problem that a large-size observation hole is formed in the vibrating screen cover plate due to detection is avoided, observation obstacles can be eliminated due to the arrangement of the observation device, the imaging environment and the imaging background are optimized, and meanwhile, the activated carbon particles are prevented from jumping out of the vibrating screen, so that the safe and stable operation of the activated carbon flue gas purification device is ensured.
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 detecting high temperature of activated carbon and cooling at a blanking channel according to the present invention;
FIG. 4 is a schematic diagram of a thermal imager acquiring a primary thermal image of a material in a first detection area according to the present invention;
FIG. 5 is a schematic diagram of a thermal imager acquiring a secondary thermal image of a material in a second detection area according to the present invention;
FIG. 6 is a schematic view of the position and structure of the observation device according to the present invention;
FIG. 7 is a relationship diagram of a thermal imager, a control system, and a data processing module according to the present invention;
fig. 8 is a data processing flow chart of the thermal imager of the present invention;
FIG. 9 is a schematic structural view of a vibrating screen, an over-screen activated carbon channel and a conveyor in the invention;
FIG. 10 is a schematic structural view of a cooling system at a first high temperature activated carbon detecting and blanking channel according to the present invention;
FIG. 11 is a plan view of a first activated carbon quenching cooling device in accordance with the present invention;
FIG. 12 is a side view of a first activated carbon quenching cooling device according to the present invention;
FIG. 13 is a logic block diagram of a first high temperature activated carbon quenching cooling process in accordance with the present invention;
FIG. 14 is a schematic structural view of a cooling system at a second high temperature activated carbon detecting and blanking channel in the present invention;
FIG. 15 is a plan view of a second activated carbon quenching cooling device in accordance with the present invention;
FIG. 16 is a side view of a second activated carbon quenching cooling device in accordance with the present invention;
FIG. 17 is a logic block diagram of a second high temperature activated carbon quenching cooling process in accordance with the present invention;
FIG. 18 is a schematic structural view of a cooling system at a third high temperature activated carbon detecting and blanking channel in the present invention;
FIG. 19 is a plan view of a third activated carbon quenching cooling device in accordance with the present invention;
FIG. 20 is a side view of a third activated carbon quenching cooling device in accordance with the present invention;
FIG. 21 is a logic block diagram of a third high temperature activated carbon quenching cooling process in accordance with the present invention;
reference numerals:
1: a thermal imager; 2: vibrating screen; 201: a cover plate; 3: an imaging area; 301: a first detection zone; 302: a second detection zone; 4: an observation device; 401: a sidewall mask body; 402: a top viewing aperture; 403: a bottom viewing aperture; 404: a front bulkhead; 405: a rear bulkhead; 5: a gas injection device; 501: a gas delivery main pipe; 502: a gas delivery manifold; 503: a gas valve; 504: a gas nozzle; 6: a cooling water spray device; 601: a cooling water delivery main pipe; 602: a cooling water delivery branch pipe; 603: a cooling water valve; 604: a cooling water nozzle; 7: an active carbon channel is arranged on the screen; 8: a conveyor; a1: a data processing module; a2: and (5) controlling the system.
Detailed Description
According to the embodiment of the invention, a system for detecting high-temperature activated carbon and cooling at a blanking channel is provided.
The utility model provides a high temperature active carbon detects and blanking passageway department refrigerated system, this system includes thermal imaging system 1, shale shaker 2, active carbon extinguishes cooling device, on-screen active carbon passageway 7, conveyer 8. And an oversize activated carbon outlet of the vibrating screen 2 is connected with a feed inlet of a conveyor 8 through an oversize activated carbon channel 7. The vibrating screen 2 is provided with a cover plate 201. The thermal imaging camera 1 is disposed above the cover plate 201 of the vibrating screen 2. An imaging zone 3 is provided on the shaker 2. The imaging zone 3 includes a first detection zone 301 and a second detection zone 302. On the vibrating screen 2, the first detection zone 301 is located upstream of the second detection zone 302. The activated carbon extinguishing cooling device is arranged on the activated carbon channel 7 on the screen.
In the invention, the activated carbon extinguishing and cooling device is a gas blowing device 5. The gas blowing device 5 includes a main gas supply pipe 501, a branch gas supply pipe 502, and a gas nozzle 504. The gas delivery main pipe 501 is provided outside the on-screen activated carbon passage 7. The gas delivery manifold 502 is disposed on the oversize activated carbon passage 7. One end of the gas delivery branch pipe 502 is connected with the gas delivery main pipe 501, and the other end extends into the oversize activated carbon passage 7. The gas delivery manifold 502 terminates in a gas nozzle 504. Preferably, the gas delivery main pipe 501 is provided with a gas valve 503, and the gas valve 503 controls the opening and closing of the gas blowing device 5.
Preferably, the number of gas delivery manifolds 502 is multiple, preferably 2-30, more preferably 3-16. Each gas delivery branch pipe 502 is connected to the gas delivery main pipe 501, and a plurality of gas delivery branch pipes 502 are uniformly distributed along the periphery of the oversize activated carbon passage 7. Preferably, the gas nozzles 504 are located on the underside of the distal end of the gas delivery manifold 502. Or
In the invention, the activated carbon extinguishing cooling device is a cooling water spraying device 6. The cooling water spray device 6 includes a cooling water delivery main pipe 601, a cooling water delivery branch pipe 602, and a cooling water nozzle 604. The cooling water delivery main pipe 601 is provided outside the on-screen activated carbon passage 7. The cooling water delivery branch pipe 602 is provided on the on-screen activated carbon passage 7. One end of the cooling water delivery branch pipe 602 is connected with the cooling water delivery main pipe 601, and the other end extends into the on-screen activated carbon channel 7. The cooling water delivery branch pipe 602 is provided at its end with a cooling water nozzle 604. Preferably, the cooling water delivery main pipe 601 is provided with a cooling water valve 603, and the cooling water valve 603 controls the cooling water spraying device 6 to be opened and closed.
Preferably, the number of the cooling water delivery branch pipes 602 is plural, preferably 2 to 30, and more preferably 3 to 16. Each cooling water delivery branch pipe 602 is connected to the cooling water delivery main pipe 601, and the plurality of cooling water delivery branch pipes 602 are uniformly distributed along the periphery of the oversize activated carbon passage 7. Preferably, the cooling water nozzles 604 are located at the lower side of the distal end of the cooling water delivery manifold 602.
In the invention, the activated carbon extinguishing cooling device comprises an activated carbon extinguishing device and an activated carbon cooling device. Wherein, the active carbon extinguishing device is a gas blowing device 5 arranged on an active carbon channel 7 on the screen. The active carbon cooling device is a cooling water spraying device 6 arranged on the active carbon channel 7 on the screen.
Preferably, the cooling water delivery branch pipe 602 of the cooling water spray device 6 is disposed below the gas delivery branch pipe 502 of the gas blowing device 5.
Preferably, the system further comprises a viewing device 4, the viewing device 4 being arranged on the upper part of the cover plate 201 of the vibrating screen 2, between the cover plate 201 of the vibrating screen 2 and the thermal imaging camera 1. The viewing device 4 comprises a sidewall shell 401, a top viewing aperture 402 and a bottom viewing aperture 403. The top observation hole 402 is defined as the area surrounded by the top edges of the side wall shells 401. The bottom viewing aperture 403 is defined by the bottom edge of the sidewall shroud 401. Preferably, an opening is formed in the cover plate 201 of the vibrating screen 2, and the bottom observation hole 403 of the observation device 4 is equal in size and coincident in position with the opening in the cover plate 201. Preferably, the width of the openings is equal or substantially equal to the width of the vibrating screen 2.
The thermal imaging system 1 surrounds the observation device 4 makes reciprocating motion in a vertical plane, and the thermal imaging system 1 shoots materials entering the first detection area 301 and the second detection area 302 on the vibrating screen 2 in real time through the observation device 4 to obtain a primary thermal imaging diagram and a secondary thermal imaging diagram.
Preferably, the bottom of the observation device 4 is further provided with a front partition 404 and a rear partition 405, both of which are located at the bottom of the sidewall housing 401, the front partition 404 is located at the upstream side of the bottom observation hole 403, and the rear partition 405 is located at the downstream side of the bottom observation hole 403.
Preferably, the front and rear baffles 404, 405 are correspondingly moved in the plane of the bottom viewing aperture 403 along the length of the shaker screen 2 in response to changes in the position of the thermal imaging camera 1 reciprocating in a vertical plane about the viewing device 4. Preferably, the center of the gap between the front partition 404 and the rear partition 405 is aligned with the center of the top observation hole 402 and the thermal imaging camera 1.
Preferably, the system further comprises a data processing module a1 and a control system a 2. The thermal imaging system 1 is connected with a data processing module A1, and the data processing module A1 is connected with a control system A2. Meanwhile, the gas valve 503 of the gas blowing device 5 and the cooling water valve 603 of the cooling water spraying device 6 are connected to the control system a 2. The control system a2 controls the operation of the data processing module a1, the thermal imager 1, the gas valve 503, and the cooling water valve 603.
Example 1
As shown in fig. 4-5 and fig. 9-10, a system for detecting high-temperature activated carbon and cooling at a blanking channel comprises a thermal imaging camera 1, a vibrating screen 2, an activated carbon extinguishing cooling device, an on-screen activated carbon channel 7 and a conveyor 8. And an oversize activated carbon outlet of the vibrating screen 2 is connected with a feed inlet of a conveyor 8 through an oversize activated carbon channel 7. The vibrating screen 2 is provided with a cover plate 201. The thermal imaging camera 1 is disposed above the cover plate 201 of the vibrating screen 2. An imaging zone 3 is provided on the shaker 2. The imaging zone 3 includes a first detection zone 301 and a second detection zone 302. On the vibrating screen 2, the first detection zone 301 is located upstream of the second detection zone 302. The activated carbon extinguishing cooling device is arranged on the activated carbon channel 7 on the screen.
Example 2
As shown in fig. 11 to 12, example 1 was repeated except that the activated carbon extinction cooling device was a gas blowing device 5. The gas blowing device 5 includes a main gas supply pipe 501, a branch gas supply pipe 502, and a gas nozzle 504. The gas delivery main pipe 501 is provided outside the on-screen activated carbon passage 7. The gas delivery manifold 502 is disposed on the oversize activated carbon passage 7. One end of the gas delivery branch pipe 502 is connected with the gas delivery main pipe 501, and the other end extends into the oversize activated carbon passage 7. The gas delivery manifold 502 terminates in a gas nozzle 504. The gas delivery main pipe 501 is provided with a gas valve 503, and the gas valve 503 controls the opening and closing of the gas blowing device 5.
The number of gas delivery manifolds 502 is 16. Each gas delivery branch pipe 502 is connected to the gas delivery main pipe 501, and 16 gas delivery branch pipes 502 are uniformly distributed along the periphery of the oversize activated carbon passage 7. The gas nozzles 504 are located on the underside of the distal end of the gas delivery manifold 502.
Example 3
Embodiment 2 is repeated as shown in fig. 6, except that the system further comprises a viewing device 4, the viewing device 4 being arranged on top of the cover plate 201 of the vibrating screen 2, between the cover plate 201 of the vibrating screen 2 and the thermal imaging camera 1. The viewing device 4 comprises a sidewall shell 401, a top viewing aperture 402 and a bottom viewing aperture 403. The top observation hole 402 is defined as the area surrounded by the top edges of the side wall shells 401. The bottom viewing aperture 403 is defined by the bottom edge of the sidewall shroud 401. The cover plate 201 of the vibrating screen 2 is provided with an opening, and the bottom observation hole 403 of the observation device 4 is equal to the opening of the cover plate 201 in size and is coincident in position. The width of the opening is equal to the width of the vibrating screen 2.
The thermal imaging system 1 surrounds the observation device 4 makes reciprocating motion in a vertical plane, and the thermal imaging system 1 shoots materials entering the first detection area 301 and the second detection area 302 on the vibrating screen 2 in real time through the observation device 4 to obtain a primary thermal imaging diagram and a secondary thermal imaging diagram.
Example 4
Example 3 was repeated except that the bottom of the observation device 4 was further provided with a front partition 404 and a rear partition 405, both of which are located at the bottom of the sidewall housing 401, the front partition 404 being located at the upstream side of the bottom observation hole 403, and the rear partition 405 being located at the downstream side of the bottom observation hole 403.
In response to the change in the position of the thermal imaging camera 1 reciprocating in the vertical plane about the viewing device 4, the front and rear bulkheads 404, 405 move along the length of the shaker 2 in the plane of the bottom viewing aperture 403. The center of the gap between the front baffle 404 and the rear baffle 405 is aligned with the center of the top observation hole 402 and the thermal imaging camera 1.
Example 5
As shown in FIG. 7, example 4 is repeated except that the system further includes a data processing module A1 and a control system A2. The thermal imaging system 1 is connected with a data processing module A1, and the data processing module A1 is connected with a control system A2. Meanwhile, the gas valve 503 of the gas blowing device 5 is connected to the control system a 2. The control system a2 controls the operation of the data processing module a1, the thermal imager 1, and the gas valve 503.
Example 6
As shown in FIGS. 14 to 16, example 5 was repeated except that the activated carbon extinction cooling device was replaced with a cooling water spraying device 6 by the gas blowing device 5. The cooling water spray device 6 includes a cooling water delivery main pipe 601, a cooling water delivery branch pipe 602, and a cooling water nozzle 604. The cooling water delivery main pipe 601 is provided outside the on-screen activated carbon passage 7. The cooling water delivery branch pipe 602 is provided on the on-screen activated carbon passage 7. One end of the cooling water delivery branch pipe 602 is connected with the cooling water delivery main pipe 601, and the other end extends into the on-screen activated carbon channel 7. The cooling water delivery branch pipe 602 is provided at its end with a cooling water nozzle 604. The cooling water delivery main pipe 601 is provided with a cooling water valve 603, and the cooling water valve 603 controls the cooling water spraying device 6 to be opened and closed.
The number of the cooling water delivery branch pipes 602 is 16. Each cooling water delivery branch pipe 602 is connected to the cooling water delivery main pipe 601, and 16 cooling water delivery branch pipes 602 are uniformly distributed along the periphery of the oversize activated carbon passage 7. The cooling water nozzles 604 are located at the lower side of the distal ends of the cooling water delivery branch pipes 602.
The cooling water valve 603 of the cooling water sprinkler 6 is connected to the control system a 2. The control system a2 controls the operation of the data processing module a1, the thermal imager 1, and the cooling water valve 603.
Example 7
Example 5 was repeated except that the activated carbon extinction cooling device included an activated carbon extinction device and an activated carbon cooling device, as shown in fig. 18 to 20. Wherein, the active carbon extinguishing device is a gas blowing device 5 arranged on an active carbon channel 7 on the screen. The active carbon cooling device is a cooling water spraying device 6 arranged on the active carbon channel 7 on the screen.
The cooling water spray device 6 includes a cooling water delivery main pipe 601, a cooling water delivery branch pipe 602, and a cooling water nozzle 604. The cooling water delivery main pipe 601 is provided outside the on-screen activated carbon passage 7. The cooling water delivery branch pipe 602 is provided on the on-screen activated carbon passage 7. One end of the cooling water delivery branch pipe 602 is connected with the cooling water delivery main pipe 601, and the other end extends into the on-screen activated carbon channel 7. The cooling water delivery branch pipe 602 is provided at its end with a cooling water nozzle 604. The cooling water delivery main pipe 601 is provided with a cooling water valve 603, and the cooling water valve 603 controls the cooling water spraying device 6 to be opened and closed.
The number of the cooling water delivery branch pipes 602 is 16. Each cooling water delivery branch pipe 602 is connected to the cooling water delivery main pipe 601, and 16 cooling water delivery branch pipes 602 are uniformly distributed along the periphery of the oversize activated carbon passage 7. The cooling water nozzles 604 are located at the lower side of the distal ends of the cooling water delivery branch pipes 602.
The cooling water delivery branch pipe 602 of the cooling water spray device 6 is disposed below the gas delivery branch pipe 502 of the gas blowing device 5.
The gas valve 503 of the gas blowing device 5 and the cooling water valve 603 of the cooling water spraying device 6 are both connected with a control system a 2. The control system a2 controls the operation of the data processing module a1, the thermal imager 1, the gas valve 503, and the cooling water valve 603.
Example 8
As shown in fig. 3, a method for detecting high-temperature activated carbon and cooling a blanking channel comprises the following steps:
1) the material enters the vibrating screen 2, and the thermal imaging instrument 1 shoots the material entering the first detection area 301 on the vibrating screen 2 in real time to obtain a primary thermal imaging graph;
2) whether the material entering the first detection area 301 has a high temperature point is judged according to the primary thermal imaging image analysis;
2a) if the primary thermal imaging image is judged not to have the high temperature point, repeating the step 1);
2b) if the primary thermal imaging image is judged to have the suspected high-temperature point, performing step 3);
3) the thermal imaging instrument 1 tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering a second detection area 302 on the vibrating screen 2, and further judges whether the suspected high-temperature point is a high-temperature point;
3a) if the suspected high temperature point is a false high temperature point, repeating the step 1);
3b) if the suspected high-temperature point is determined as the high-temperature point, recording the found position of the material at the high-temperature point in the second detection area 302 on the vibrating screen 2 and giving an alarm;
4) the detected high-temperature materials are put out a fire and cooled through an active carbon extinguishing cooling device arranged at an active carbon channel 7 on the screen between the vibrating screen 2 and the conveyor 8.
Wherein the first detection zone 301 is located upstream of the second detection zone 302 on the vibrating screen 2.
Example 9
As shown in fig. 13, example 8 was repeated except that in step 4), the activated carbon extinction cooling device was the gas blowing device 5. The fire extinguishing and cooling treatment comprises the following steps: the gas blowing device 5 arranged on the active carbon channel 7 on the screen blows fire extinguishing gas to the detected high-temperature material, so that the high-temperature material is extinguished and cooled.
In the fire extinguishing and temperature reducing treatment, the mass flow of the fire extinguishing gas sprayed by the gas spraying device 5 satisfies the following relational expression:
Figure BDA0002890389280000171
wherein: LL (LL)NThe flow of the fire extinguishing gas which is blown in the quenching and cooling treatment process of the active carbon is kg/s. ChtThe specific heat capacity of the activated carbon is kJ/(kg-DEG C). LL (LL)htThe flow rate of the activated carbon to be quenched and cooled is kg/s. Theta ThtIn order to adopt the fire extinguishing gas to extinguish the temperature of the active carbon in the cooling process, the temperature is higher than the temperature of the active carbon. Theta TNThe temperature of the fire extinguishing gas is increased after the fire extinguishing gas is extinguished and cooled. CNkJ/(kg. DEG C.) is the specific heat capacity of the fire extinguishing gas. KN1Ratio of fire suppressing gas to active carbon cooling, KN1＝0.95。KN2For the participation of extinguishing gas in the cooling process of activated carbon, KN2＝0.95。
Example 10
Example 9 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.
In step 1), the thermal imager 1 shoots the material entering the first detection area 301 in real time to obtain a primary thermal imaging diagram, which specifically comprises:
1a) be equipped with the trompil on the apron 201 of shale shaker 2, viewing device 4 sets up in the trompil top and covers the trompil, and thermal imaging system 1 sets up in the top of apron 201, and viewing device 4 is located between apron 201 and thermal imaging system 1.
1b) The thermal imaging system 1 shoots the material entering the vibrating screen 2 in the first detection area 301 in real time through the observation device 4 and the opening hole to obtain a thermal imaging diagram.
Example 11
The embodiment 10 is repeated, except that in step 2), whether the material entering the first detection area 301 has a high temperature point is determined according to the thermal imaging image analysis, specifically:
acquiring a highest temperature value T1 in the primary thermal imaging image according to the 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; preferably, T0 is taken to be 420 ℃.
In step 3), the thermal imaging instrument 1 tracks and shoots a secondary thermal imaging graph in which the material at the suspected high-temperature point enters the second detection area 302, specifically:
the thermal imaging system 1 reciprocates in a vertical plane around the observation device 4, and the thermal imaging system 1 detects the material entering a suspected high-temperature point in the second detection area 302 on the vibrating screen 2 through the observation device 4 to obtain a secondary thermal imaging graph.
As shown in fig. 8, in step 3), determining whether the suspected high temperature point is a high temperature point according to the secondary thermal imaging map, specifically:
dividing the secondary imaging graph into 9 areas, 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. And if the T2 is less than or equal to T0, judging the suspected high temperature point as a false high temperature point. 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 graph, so that the found position of the material at the high temperature point in the second detection area 302 on the vibrating screen 2 is determined and an alarm is given.
Example 12
As shown in FIG. 17, example 11 was repeated except that the activated carbon extinction cooling device was replaced with a cooling water spraying device 6 by the gas blowing device 5. The fire extinguishing and cooling treatment comprises the following steps: the cooling water spraying device 6 arranged on the active carbon channel 7 on the screen sprays cooling water to the detected high-temperature materials, so that the high-temperature materials are extinguished and cooled.
In the fire extinguishing and temperature reducing treatment in the step 4), the mass flow of the cooling water sprayed by the cooling water spraying device 6 satisfies the following relational expression:
Figure BDA0002890389280000191
wherein: LL (LL)H1The flow of cooling water sprayed in the quenching and cooling process of the active carbon is kg/s. ChtThe specific heat capacity of the activated carbon is kJ/(kg-DEG C). LL (LL)htThe flow rate of the activated carbon to be quenched and cooled is kg/s. Theta ThtlIn order to quench the target temperature of the active carbon in the cooling process by using cooling water, the temperature is controlled. CH1The specific heat capacity of water at the evaporation temperature, kJ/(kg. DEG C.). T ise1The evaporation temperature of water, DEG C. T ise2The initial temperature of the cooling water is DEG C. CH2The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C.). h ishzIs the latent heat of vaporization of water at the evaporation temperature, kJ/kg.
Example 13
As shown in fig. 21, example 11 was repeated except that in step 4), the activated carbon extinction cooling means included activated carbon extinction means and activated carbon cooling means. Wherein the activated carbon extinguishing device is the gas blowing device 5. The active carbon cooling device is a cooling water spraying device 6. The fire extinguishing and cooling treatment comprises the following steps: the extinguishing treatment of the high-temperature materials is completed by blowing the fire extinguishing gas to the detected high-temperature materials through the gas blowing device 5 arranged on the active carbon passage 7 on the screen. And the cooling water spraying device 6 arranged on the active carbon channel 7 on the screen sprays cooling water to the detected high-temperature materials, so that the cooling treatment of the high-temperature materials is completed.
In the fire extinguishing and temperature reducing treatment in the step 4), the gas spraying device 5 sprays fire extinguishing gas to the detected high-temperature materials, and meanwhile, the cooling water spraying device 6 sprays cooling water to the detected high-temperature materials. Wherein the flow rate V of the fire extinguishing gas blown by the gas blowing device 5NComprises the following steps:
Figure BDA0002890389280000192
in the formula: vNThe flow of the fire extinguishing gas, m, blown in the process of extinguishing the activated carbon3/s。STIs the cross-sectional area of the activated carbon channel on the sieve, m2。L2Is the height difference m between the nozzle position of the gas injection device and the nozzle position of the cooling water spraying device. t is ti0And (4) the time, s, for the high-temperature material to move from the detected high-temperature point position to the nozzle position of the gas injection device.
Water spray quantity LL of cooling water spray device 6H2The following formula is satisfied:
Figure BDA0002890389280000193
in the formula: LL (LL)H2The flow rate of cooling water sprayed in the cooling treatment process of the active carbon is kg/s. ChtThe specific heat capacity of the activated carbon is kJ/(kg-DEG C). LL (LL)htThe flow rate of the activated carbon to be cooled is kg/s. Theta Tht2Is the target of active carbon temperature reduction. CH1The specific heat capacity of water at the evaporation temperature, kJ/(kg. DEG C.). T ise1The evaporation temperature of water, DEG C. T ise2The initial temperature of the cooling water is DEG C. CH2The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C.). h ishzIs the latent heat of vaporization of water at the evaporation temperature, kJ/kg.
Application example 1
A method for detecting high-temperature activated carbon and cooling at a blanking channel by using the system in embodiment 5 comprises the following steps:
1) the material gets into shale shaker 2, and thermal imaging system 1 shoots in real time the material that gets into first detection zone 301 on shale shaker 2, obtains once thermal imaging graph.
2) According to the primary thermal imaging graph analysis, the highest material temperature T1 in the first detection area 301 is obtained as 412 ℃, T1 is compared with a set target temperature T0, the value of T0 is 410 ℃, and T1 is more than T0, so that the fact that a suspected high temperature point exists in the primary thermal imaging graph is judged.
3) The thermal imaging instrument 1 tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering the second detection area 302 on the vibrating screen 2, and further judges whether the suspected high-temperature point is a high-temperature point.
Dividing the secondary thermal imaging graph into 9 areas, acquiring the highest temperature of each of the 9 areas, selecting the highest temperature value T2 of the 9 highest temperatures as 412 ℃, and comparing the highest temperature value T2 with the set target temperature T0 as 410 ℃. T2 > T0, and 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 graph, so that the found position of the material at the high temperature point in the second detection area 302 on the vibrating screen 2 is determined and an alarm is given.
After the found position of the material at the high-temperature point in the second detection area 302 on the vibrating screen 2 is detected and determined, the gas blowing device 5 blows fire extinguishing gas, the time length t1 for blowing the fire extinguishing gas is more than 2 times of the time for moving the activated carbon particles from the detected found position to the gas blowing device 5, and t1 is 35 s. The fire extinguishing gas is nitrogen. The mass flow of the fire extinguishing gas blown by the gas blowing device 5 satisfies the following relational expression:
Figure BDA0002890389280000201
wherein: LL (LL)NThe flow of the fire extinguishing gas which is blown in the quenching and cooling treatment process of the active carbon is kg/s. ChtIs the specific heat capacity of activated carbon, Cht＝0.84kJ/(kg·℃)。LLhtFor the flow of the cooled activated carbon to be extinguished, LLht＝5kg/s。ΔThtTheta T as the target of temperature reduction by activated carbon in the process of quenching and cooling by fire extinguishing gasht＝20℃。θTNTo increase the temperature of the extinguishing gas after the temperature of the extinguishing gas is loweredN＝20℃。CNSpecific heat capacity of extinguishing gas, CN＝1.3kJ/(kg·℃)。KN1Ratio of fire suppressing gas to active carbon cooling, KN1＝0.95。KN2For the participation of extinguishing gas in the cooling process of activated carbon, KN2＝0.95。
Application example 2
A method for detecting high-temperature activated carbon and cooling at a blanking channel by using the system in embodiment 6 comprises the following steps:
1) the material gets into shale shaker 2, and thermal imaging system 1 shoots in real time the material that gets into first detection zone 301 on shale shaker 2, obtains once thermal imaging graph.
2) According to the primary thermal imaging graph analysis, the highest material temperature T1 in the first detection area 301 is obtained to be 418 ℃, T1 is compared with a set target temperature T0, the value of T0 is 410 ℃, and T1 is larger than T0, so that the fact that a suspected high temperature point exists in the primary thermal imaging graph is judged.
3) The thermal imaging instrument 1 tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering the second detection area 302 on the vibrating screen 2, and further judges whether the suspected high-temperature point is a high-temperature point.
Dividing the secondary thermal imaging graph into 9 areas, acquiring the highest temperature of each of the 9 areas, selecting a highest temperature value T2 of the 9 highest temperatures as 419 ℃, and comparing the highest temperature value T2 with a set target temperature T0 as 410 ℃. T2 > T0, and 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 graph, so that the found position of the material at the high temperature point in the second detection area 302 on the vibrating screen 2 is determined and an alarm is given.
After the found position of the material at the high-temperature point in the second detection area 302 on the vibrating screen 2 is detected and determined, cooling water is sprayed by the cooling water spraying device 6, the time length t2 for spraying the cooling water is more than 2 times of the time for moving the activated carbon particles from the detected found position to the cooling water spraying device 6, and t2 is 28 s. The mass flow of the cooling water sprayed by the cooling water spraying device 6 satisfies the following relational expression:
Figure BDA0002890389280000211
wherein: LL (LL)H1The flow of cooling water sprayed in the quenching and cooling process of the active carbon is kg/s. ChtTo move aliveSpecific heat capacity of charcoal, Cht＝0.84kJ/(kg·℃)。LLhtFor the flow of the cooled activated carbon to be extinguished, LLht＝5kg/s。θTht1In order to quench the active carbon cooling target in the cooling process by using cooling water, theta Tht1＝80℃。CH1Specific heat capacity of water at evaporation temperature, CH1＝4.22kJ/(kg·℃)。Te1Is the evaporation temperature of water, Te1＝100℃。Te2Is the initial temperature of the cooling water, Te2＝25℃。CH2Specific heat capacity of water at initial temperature, CH2＝4.177kJ/(kg·℃)。hhzThe latent heat of vaporization of water at the evaporation temperature, hhz＝2257.1kJ/kg。
Application example 3
A method for detecting high-temperature activated carbon and cooling at a blanking channel by using the system in embodiment 7 comprises the following steps:
1) the material gets into shale shaker 2, and thermal imaging system 1 shoots in real time the material that gets into first detection zone 301 on shale shaker 2, obtains once thermal imaging graph.
2) According to the primary thermal imaging graph analysis, the highest material temperature T1 in the first detection area 301 is obtained to be 426 ℃, T1 is compared with a set target temperature T0, the value of T0 is 410 ℃, and T1 is larger than T0, so that the fact that a suspected high temperature point exists in the primary thermal imaging graph is judged.
3) The thermal imaging instrument 1 tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering the second detection area 302 on the vibrating screen 2, and further judges whether the suspected high-temperature point is a high-temperature point.
Dividing the secondary thermal imaging graph into 9 areas, acquiring the highest temperature of each of the 9 areas, selecting a highest temperature value T2 of the 9 highest temperatures to be 427 ℃, and comparing the highest temperature value T2 with a set target temperature T0 to be 410 ℃. T2 > T0, and 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 graph, so that the found position of the material at the high temperature point in the second detection area 302 on the vibrating screen 2 is determined and an alarm is given.
After the found position of the material at the high-temperature point in the second detection area 302 on the vibrating screen 2 is detected and determined, the gas blowing device 5 blows fire extinguishing gas, the cooling water spraying device 6 sprays cooling water after the time delay t3 is 0.5s, and the cooling water spraying time period t4 is 22s (which is more than 2 times of the time for moving the activated carbon particles from the detected found position to the gas blowing device 5). After the cooling water stops spraying, the fire extinguishing gas continues to be sprayed for a time t5 which is 1 s. The fire extinguishing gas is nitrogen. Wherein the flow rate of the fire extinguishing gas blown by the gas blowing device 5 is
Figure BDA0002890389280000221
In the formula: vNThe flow of the fire extinguishing gas, m, blown in the process of extinguishing the activated carbon3And s. ST is the cross-sectional area of the passage of the activated carbon on the sieve, ST＝0.16m2。L2Is the height difference, L, between the nozzle position of the gas injection device and the nozzle position of the cooling water spray device2＝0.4m。ti0The time for the high-temperature material to move from the detected high-temperature point position to the nozzle position of the gas injection device, ti0＝10s。
Water spray quantity LL of cooling water spray device 6H2The following formula is satisfied:
Figure BDA0002890389280000222
in the formula: LL (LL)H2The flow rate of cooling water sprayed in the cooling treatment process of the active carbon is kg/s. ChtIs the specific heat capacity of activated carbon, Cht＝0.84kJ/(kg·℃)。LLhtFor the flow of activated carbon to be cooled, LLht＝5kg/s。θTht2Theta T as a target for cooling the activated carbonht2＝40℃。CH1Specific heat capacity of water at evaporation temperature, CH1＝4.22kJ/(kg·℃)。Te1Is the evaporation temperature of water, Te1＝100℃。Te2Is the initial temperature of the cooling water, Te2＝25℃。CH2For water at initial temperatureSpecific heat capacity, CH2＝4.177kJ/(kg·℃)。hhzThe latent heat of vaporization of water at the evaporation temperature, hhz＝2257.1kJ/kg。
Application example 4
A method for detecting high-temperature activated carbon and cooling at a blanking channel by using the system in embodiment 7 comprises the following steps:
1) the material gets into shale shaker 2, and thermal imaging system 1 shoots in real time the material that gets into first detection zone 301 on shale shaker 2, obtains once thermal imaging graph.
2) According to the primary thermal imaging graph analysis, the maximum material temperature T1 in the first detection area 301 is obtained to be 147 ℃, T1 is compared with a set target temperature T0, the value of T0 is 410 ℃, and T1 is less than T0, so that the primary thermal imaging graph is judged not to have a high temperature point. The thermal imaging system 1 continuously monitors the high temperature of the material subsequently entering the first detection area 301.

Claims (13)

1. A method for detecting high-temperature activated carbon and cooling a blanking channel comprises the following steps:
1) the method comprises the following steps that materials enter a vibrating screen (2), a thermal imaging instrument (1) shoots the materials entering a first detection area (301) on the vibrating screen (2) in real time to obtain a primary thermal imaging graph;
2) whether the material entering the first detection area (301) has a high temperature point is judged according to the primary thermal imaging image analysis;
2a) if the primary thermal imaging image is judged not to have the high temperature point, repeating the step 1);
2b) if the primary thermal imaging image is judged to have the suspected high-temperature point, performing step 3);
3) a thermal imaging instrument (1) tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering a second detection area (302) on the vibrating screen (2), and further judges whether the suspected high-temperature point is a high-temperature point;
3a) if the suspected high temperature point is a false high temperature point, repeating the step 1);
3b) if the suspected high-temperature point is determined as the high-temperature point, recording the found position of the material at the high-temperature point in a second detection area (302) on the vibrating screen (2) and giving an alarm;
4) the detected high-temperature materials are subjected to fire extinguishing and cooling treatment through an activated carbon extinguishing cooling device arranged at an activated carbon channel (7) on the screen between the vibrating screen (2) and the conveyor (8);
wherein the first detection zone (301) is located upstream of the second detection zone (302) on the vibrating screen (2).
2. The method of claim 1, wherein: in the step 4), the activated carbon extinguishing and cooling device is a gas blowing device (5); the fire extinguishing and cooling treatment comprises the following steps: the gas blowing device (5) arranged on the active carbon channel (7) on the screen is used for blowing fire extinguishing gas to the detected high-temperature material, so that the high-temperature material is extinguished and cooled; or
In the step 4), the activated carbon extinguishing and cooling device is a cooling water spraying device (6); the fire extinguishing and cooling treatment comprises the following steps: the cooling water is sprayed to the detected high-temperature materials through the cooling water spraying device (6) arranged on the active carbon channel (7) on the screen, so that the high-temperature materials are extinguished and cooled.
3. The method of claim 1, wherein: in the step 4), the activated carbon extinguishing cooling device comprises an activated carbon extinguishing device and an activated carbon cooling device; wherein the activated carbon extinguishing device is a gas blowing device (5); the active carbon cooling device is a cooling water spraying device (6); the fire extinguishing and cooling treatment comprises the following steps: the gas blowing device (5) arranged on the active carbon channel (7) on the screen is used for blowing fire extinguishing gas to the detected high-temperature material to finish the extinguishing treatment of the high-temperature material; and the cooling water spraying device (6) arranged on the on-screen activated carbon channel (7) sprays cooling water to the detected high-temperature materials to finish cooling treatment of the high-temperature materials.
4. The method of claim 2, wherein: in the fire extinguishing and temperature reducing treatment in the step 4), the mass flow of the fire extinguishing gas sprayed by the gas spraying device (5) satisfies the following relational expression:
Figure FDA0002890389270000011
wherein: LL (LL)NThe flow of the fire extinguishing gas blown in the process of quenching and cooling the active carbon is kg/s; chtThe specific heat capacity of the activated carbon is kJ/(kg DEG C); LL (LL)htThe flow rate of the activated carbon to be quenched and cooled is kg/s; delta ThtIn order to adopt the fire extinguishing gas to extinguish the cooling target of active carbon, the temperature is controlled; delta YMThe temperature of the fire extinguishing gas is increased after the fire extinguishing gas is extinguished and cooled; cNkJ/(kg. DEG C) which is the specific heat capacity of the fire extinguishing gas; kN1Ratio of fire suppressing gas to active carbon cooling, KN1＜1；KN2For the participation of extinguishing gas in the cooling process of activated carbon, KN2Less than 1; or
In the fire extinguishing and temperature reducing treatment of the step 4), the mass flow of the cooling water sprayed by the cooling water spraying device (6) satisfies the following relational expression:
Figure FDA0002890389270000021
wherein: LL (LL)H1Cooling water flow, kg/s, sprayed in the quenching and cooling process of the activated carbon; chtThe specific heat capacity of the activated carbon is kJ/(kg DEG C); LL (LL)htThe flow rate of the activated carbon to be quenched and cooled is kg/s; delta Tht1Quenching the temperature reduction target of the active carbon in the cooling process by adopting cooling water; cH1The specific heat capacity of water at the evaporation temperature, kJ/(kg. DEG C); t ise1The evaporation temperature of water, DEG C; t ise2The initial temperature of the cooling water, DEG C; cH2The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C); h ishzIs the latent heat of vaporization of water at the evaporation temperature, kJ/kg.
5. The method of claim 3, wherein: extinguishing fire and reducing temperature in step 4)In the treatment, the gas injection device (5) injects fire extinguishing gas to the detected high-temperature material, and the cooling water spraying device (6) sprays cooling water to the detected high-temperature material; wherein the flow rate V of the fire extinguishing gas blown by the gas blowing device (5)NThe following formula is satisfied:
Figure FDA0002890389270000022
in the formula: vNThe flow of the fire extinguishing gas, m, blown in the process of extinguishing the activated carbon3/s；STIs the cross-sectional area of the activated carbon channel on the sieve, m2；L2The height difference m between the nozzle position of the gas injection device and the nozzle position of the cooling water spraying device; t is ti0The time s for the high-temperature material to move from the detected high-temperature point position to the nozzle position of the gas injection device;
the water spray amount LL of the cooling water spray device (6)H2The following formula is satisfied:
Figure FDA0002890389270000023
in the formula: LL (LL)H2The flow rate of cooling water sprayed out in the cooling treatment process of the active carbon is kg/s; chtThe specific heat capacity of the activated carbon is kJ/(kg DEG C); LL (LL)htThe flow rate of the activated carbon to be cooled is kg/s; delta Tht2The temperature of the active carbon is reduced to the target value of DEG C; cH1The specific heat capacity of water at the evaporation temperature, kJ/(kg. DEG C); t ise1The evaporation temperature of water, DEG C; t ise2The initial temperature of the cooling water, DEG C; cH2The specific heat capacity of water at the initial temperature, kJ/(kg. DEG C); h ishzIs the latent heat of vaporization of water at the evaporation temperature, kJ/kg.
6. The method according to any one of claims 1-5, wherein: 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);
in the step 1), the thermal imager (1) shoots the material entering the first detection area (301) in real time to obtain a primary thermal image, which specifically comprises the following steps:
1a) a cover plate (201) of the vibrating screen (2) is provided with an opening, the observation device (4) is arranged above the opening and covers the opening, the thermal imager (1) is arranged above the cover plate (201), and the observation device (4) is positioned between the cover plate (201) and the thermal imager (1);
1b) the thermal imaging instrument (1) shoots materials entering a first detection area (301) on the vibrating screen (2) in real time through the observation device (4) and the opening to obtain a primary thermal imaging image; and/or
In the step 3), the thermal imaging instrument (1) tracks and shoots a secondary thermal imaging graph of the material at the suspected high-temperature point entering the second detection area (302), and specifically comprises the following steps:
the thermal imaging system (1) reciprocates in a vertical plane around the observation device (4), and the thermal imaging system (1) detects materials entering a suspected high-temperature point in a second detection area (302) on the vibrating screen (2) through the observation device (4) to obtain a secondary thermal imaging graph.
7. The method according to any one of claims 1-6, wherein: in the step 2), whether the material entering the first detection area (301) has a high temperature point is judged according to the thermal imaging image analysis, and the method specifically comprises the following steps:
acquiring a highest temperature value T1 in the primary thermal imaging image according to the 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; preferably, the value range of T0 is 390-425 ℃, and preferably 400-420 ℃;
in step 3), judging whether the suspected high temperature point is a high temperature point according to the secondary thermal imaging map, specifically:
dividing the secondary imaging graph into n regions, obtaining the highest temperature of each region in the n regions, selecting the highest temperature value T2 in the n highest temperatures, and comparing the highest temperature value T2 with a set target temperature T0; if T2 is less than or equal to T0, judging the suspected high temperature point as a false high temperature point; if T2 is greater than T0, confirming that the suspected high temperature point is a high temperature point; the highest temperature value T2 corresponds to the area on the secondary thermal imaging graph, so that the found position of the material at the high temperature point in the second detection area (302) on the vibrating screen (2) is determined and an alarm is given.
8. A system for high temperature activated carbon detection and cooling at the activated carbon channel or a system for use in the method of any of claims 1-7, the system comprising a thermal imager (1), a vibrating screen (2), an activated carbon quench cooling device, an on-screen activated carbon channel (7), a conveyor (8); an oversize active carbon outlet of the vibrating screen (2) is connected with a feed inlet of a conveyor (8) through an oversize active carbon channel (7); a cover plate (201) is arranged on the vibrating screen (2); the thermal imaging system (1) is arranged above a cover plate (201) of the vibrating screen (2); an imaging area (3) is arranged on the vibrating screen (2); the imaging zone (3) comprises a first detection zone (301) and a second detection zone (302); -on the vibrating screen (2), the first detection zone (301) is located upstream of the second detection zone (302); the activated carbon extinguishing and cooling device is arranged on the activated carbon channel (7) on the screen.
9. The system of claim 8, wherein: the activated carbon extinguishing cooling device is a gas blowing device (5); the gas injection device (5) comprises a gas delivery main pipe (501), a gas delivery branch pipe (502) and a gas nozzle (504); the gas delivery main pipe (501) is arranged outside the on-screen activated carbon channel (7); the gas delivery branch pipe (502) is arranged on the oversize active carbon channel (7); one end of the gas delivery branch pipe (502) is connected with the gas delivery main pipe (501), and the other end of the gas delivery branch pipe extends into the on-screen activated carbon channel (7); the tail end of the gas delivery branch pipe (502) is provided with a gas nozzle (504); preferably, the gas delivery main pipe (501) is provided with a gas valve (503), and the gas valve (503) controls the opening and closing of the gas blowing device (5);
preferably, the number of the gas conveying branch pipes (502) is multiple, preferably 2 to 30, more preferably 3 to 16; each gas conveying branch pipe (502) is connected with a gas conveying main pipe (501), and a plurality of gas conveying branch pipes (502) are uniformly distributed along the periphery of the on-screen activated carbon channel (7); preferably, the gas nozzles (504) are located at the lower side of the end of the gas delivery manifold (502); or
The activated carbon extinguishing cooling device is a cooling water spraying device (6); the cooling water spraying device (6) comprises a cooling water conveying main pipe (601), a cooling water conveying branch pipe (602) and a cooling water nozzle (604); the cooling water conveying main pipe (601) is arranged outside the on-screen activated carbon channel (7); the cooling water conveying branch pipe (602) is arranged on the on-screen activated carbon channel (7); one end of the cooling water delivery branch pipe (602) is connected with the cooling water delivery main pipe (601), and the other end of the cooling water delivery branch pipe extends into the active carbon channel (7) on the screen; the tail end of the cooling water delivery branch pipe (602) is provided with a cooling water nozzle (604); preferably, a cooling water valve (603) is arranged on the cooling water conveying main pipe (601), and the cooling water valve (603) controls the cooling water spraying device (6) to be opened and closed;
preferably, the number of the cooling water conveying branch pipes (602) is multiple, preferably 2 to 30, and more preferably 3 to 16; each cooling water conveying branch pipe (602) is connected with a cooling water conveying main pipe (601), and a plurality of cooling water conveying branch pipes (602) are uniformly distributed along the periphery of the on-screen activated carbon channel (7); preferably, the cooling water nozzles (604) are located at the lower side of the distal end of the cooling water delivery manifold (602).
10. The system of claim 9, wherein: the active carbon extinguishing cooling device comprises an active carbon extinguishing device and an active carbon cooling device; wherein the active carbon extinguishing device is a gas blowing device (5) arranged on the active carbon channel (7) on the screen; the active carbon cooling device is a cooling water spraying device (6) arranged on the active carbon channel (7) on the screen;
preferably, the cooling water delivery branch pipe (602) of the cooling water spray device (6) is disposed below the gas delivery branch pipe (502) of the gas blowing device (5).
11. The system according to any one of claims 8-10, wherein: the system also comprises an observation device (4), wherein the observation device (4) is arranged on the upper part of the cover plate (201) of the vibrating screen (2) and is positioned between the cover plate (201) of the vibrating screen (2) and the thermal imaging camera (1); the viewing device (4) comprises a sidewall shroud (401), a top viewing aperture (402) and a bottom viewing aperture (403); the area enclosed by the top end edge of the side wall cover body (401) is the top observation hole (402); the area enclosed by the bottom end edge of the side wall cover body (401) is the bottom observation hole (403); preferably, an opening is formed in a cover plate (201) of the vibrating screen (2), and an observation hole (403) in the bottom of the observation device (4) is equal to the opening in the cover plate (201) in size and is superposed in position; preferably, the width of the opening is equal or substantially equal to the width of the vibrating screen (2);
the thermal imaging system (1) surrounds the observation device (4) and reciprocates in a vertical plane, and the thermal imaging system (1) shoots materials entering a first detection area (301) and/or a second detection area (302) on the vibrating screen (2) in real time through the observation device (4) to obtain a primary thermal imaging diagram and/or a secondary thermal imaging diagram.
12. The system of claim 11, wherein: the bottom of the observation device (4) is also provided with a front partition plate (404) and a rear partition plate (405), the two partition plates are both positioned at the bottom of the side wall cover body (401), the front partition plate (404) is positioned on the upstream side of the bottom observation hole (403), and the rear partition plate (405) is positioned on the downstream side of the bottom observation hole (403);
preferably, the front partition (404) and the rear partition (405) move along the length direction of the vibrating screen (2) in the plane of the bottom observation hole (403) correspondingly according to the position change of the thermal imaging camera (1) making reciprocating motion around the observation device (4) in the vertical plane; preferably, the center of the gap between the front diaphragm (404) and the rear diaphragm (405) is on the same line with the center of the top observation hole (402) and the thermal imaging camera (1).
13. The system according to any one of claims 8-12, wherein: the system further comprises a data processing module (a1) and a control system (a 2); the thermal imaging camera (1) is connected with a data processing module (A1), and the data processing module (A1) is connected with a control system (A2); meanwhile, a gas valve (503) of the gas injection device (5) and/or a cooling water valve (603) of the cooling water injection device (6) are/is connected with a control system (A2); the control system (A2) controls the operation of the data processing module (A1), the thermal imager (1), the gas valve (503) and the cooling water valve (603).
CN202110026462.0A 2021-01-08 2021-01-08 Method and system for detecting high-temperature activated carbon and cooling blanking channel Active CN112624112B (en)

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CN105107117A (en) * 2015-08-21 2015-12-02 河南联纵消防科技有限公司 Automatic tracking and positioning fire water monitor and automatic tracking and positioning jet flow fire-extinguishing method
CN107998818A (en) * 2017-05-08 2018-05-08 中冶长天国际工程有限责任公司 The inert gas protection system and method for activated carbon adsorber
CN108389352A (en) * 2018-03-14 2018-08-10 青岛市光电工程技术研究院(中国科学院光电研究院青岛光电工程技术研究中心) Fire source probing method and device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105107117A (en) * 2015-08-21 2015-12-02 河南联纵消防科技有限公司 Automatic tracking and positioning fire water monitor and automatic tracking and positioning jet flow fire-extinguishing method
CN107998818A (en) * 2017-05-08 2018-05-08 中冶长天国际工程有限责任公司 The inert gas protection system and method for activated carbon adsorber
CN108389352A (en) * 2018-03-14 2018-08-10 青岛市光电工程技术研究院(中国科学院光电研究院青岛光电工程技术研究中心) Fire source probing method and device

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