An anti-knock peak cutting system and method for reducing peak concentrations of ship painting exhaust gas

Abstract

The application discloses a kind of anti-flame breaking peak systems for reducing ship coating exhaust concentration peak, the system includes exhaust peak shaving module and anti-flame breaking module, the exhaust peak shaving module is connected with the exhaust treatment device, the anti-flame breaking module is connected with the exhaust peak shaving module;The exhaust peak shaving module includes side suction type bucket exhaust hood, first electric air valve, second electric air valve, peak shaving device and third electric air valve, the anti-flame breaking module includes inert foam bin, electromagnetic air inlet valve, fourth electric air valve, fifth electric air valve and auxiliary fan;The application also relates to a kind of method for reducing ship coating exhaust concentration peak.The exhaust peak shaving module is provided in the application, when the volatile organic compound gas concentration generated in ship spraying workshop exceeds 1500㎎ / m 3 , exhaust peak shaving module is started to reduce the concentration of volatile organic compound gas, improve the safety of ship spraying workshop operation.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, and in particular relates to a fire-prevention and explosion-reducing peak reduction system and method for reducing the peak concentration of exhaust gas during ship painting. Background Technology

[0002] During indoor paint spraying operations in ship painting plants, the large-scale volatilization of volatile organic compounds (VOCs) from paint and solvents (benzene, toluene, xylene, etc.) seriously affects the health of painting workers and the safety of the working environment. Furthermore, the rapid friction between particulate matter in the VOCs and pipe walls generates static electricity; sparks generated by workers operating machinery can also cause the combustion (explosion) of gaseous dust. Additionally, the current VOCs treatment capacity of most domestic shipbuilding painting plants' waste gas treatment equipment is only 1200-1500 mg / m³. 3 Around 2000 mg / m³, while under high-volume conditions at spray painting sites, the peak emission of organic waste gas can reach or even exceed 2000 mg / m³. 3 When dealing with such extreme working conditions, it brings great limitations and instability to the personnel and equipment at the construction site. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fire-prevention and explosion-proof peak-shaving system and method for reducing the peak concentration of volatile organic compound (VOC) gases generated in ship painting workshops. The system and method of this invention, by installing an exhaust gas peak-shaving module before the exhaust gas treatment device, can reduce the concentration of VOC gases exceeding 1500 mg / m³ in the ship painting workshop. 3 At the same time, the exhaust gas peak reduction module is activated to reduce the concentration of volatile organic compounds. The addition of an anti-explosion module improves the safety of the exhaust gas peak reduction module's operation and enhances the safety of ship painting workshop operations.

[0004] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows:

[0005] A fire-prevention and explosion-proof peak-shaving system for reducing peak concentrations of exhaust gases from ship painting processes. Volatile organic compounds (VOCs) generated during painting in the ship's painting workshop are treated by an exhaust gas treatment device before being discharged. The exhaust gas treatment device includes an exhaust gas impeller and exhaust gas treatment equipment. The treated VOCs are discharged through a chimney. The system includes an exhaust gas peak-shaving module and an explosion-proof module. The exhaust gas peak-shaving module is connected to the exhaust gas treatment device, and the explosion-proof module is connected to the exhaust gas peak-shaving module. The exhaust gas peak-shaving module includes a side-suction bucket-shaped exhaust hood, a first electric air valve, a second electric air valve, a peak-shaving device, and a third electric air valve. The explosion-proof module includes an inert foam chamber, an electromagnetic inlet valve, a fourth electric air valve, a fifth electric air valve, and an auxiliary fan. The side-suction bucket-shaped exhaust hood is connected to the exhaust gas impeller inlet via the second electric air valve. The side-suction bucket-shaped exhaust hood is connected to the peak shaving device inlet via the first electric air valve. The peak shaving device outlet is connected to the exhaust gas impeller via the third electric air valve. The electromagnetic air inlet valve is connected to the inert foam chamber. Compressed air enters the inert foam chamber through the electromagnetic air inlet valve. The inert foam chamber is connected to the peak shaving device. The exhaust gas treatment equipment is connected to the peak shaving device via a pipeline. The pipeline connecting the exhaust gas treatment equipment and the peak shaving device is equipped with the fourth electric air valve. The peak shaving device outlet is connected to the auxiliary fan inlet via the fifth electric air valve. The auxiliary fan outlet is connected to the exhaust gas treatment equipment.

[0006] The aforementioned peak shaving device includes a housing and peak shaving plates. The housing has a peak shaving device inlet and an outlet on both sides. The peak shaving device inlet is connected to the first electric air valve and the fourth electric air valve, respectively, and the peak shaving device outlet is connected to the third electric air valve and the fifth electric air valve, respectively. The upper surface of the housing has an inert gas port, a temperature sampling component port, an electronic fresh air control valve inlet, and a burst relief plate mounting hole. The front surface of the housing has multiple slots, and the peak shaving plates are installed in these slots. Each peak shaving plate has threaded abutments on both sides of the housing, and the peak shaving plates are connected and fixed to the housing via these threaded abutments. The front surface of the housing also has a burst suppression device mounting hole and a differential pressure sampling component hole. The peak shaving device operates under negative pressure.

[0007] The aforementioned peak-shaving plate is generally rectangular in shape. It includes a sealing cover and a sealing mesh plate. The sealing cover is located on one side of the peak-shaving plate and is surrounded by corrosion-resistant and high-temperature-resistant rubber rings. A handle is provided on the sealing cover, allowing the peak-shaving plate to be pushed into or pulled out of the slot on the housing by pushing or pulling the handle. Multiple through holes are evenly distributed on the end face of the sealing mesh plate. A support rod and filler are provided inside the sealing mesh plate, with the support rod fixing the filler to the sealing mesh plate. Limiting slides are provided on both sides of the peak-shaving plate, allowing the peak-shaving plate to be pushed into or pulled out of the slot on the housing via these limiting slides.

[0008] The threaded abutment plate is generally elongated. The fixed end of the threaded abutment plate is fixed to both sides of the plate groove of the box body by bolts. The free end of the threaded abutment plate rotates around the bolts. When the peak-cutting plate is pushed into the plate groove of the box body, the threaded abutment plate is rotated so that the free end of the threaded abutment plate is located on the sealing cover plate. The bolts are tightened so that the threaded abutment plate fixes the peak-cutting plate in the plate groove of the box body.

[0009] When the filler in the sealing mesh plate is granular activated carbon, the iodine value of the granular activated carbon is not less than 800 mg / g; when the filler in the sealing mesh plate is honeycomb activated carbon, the iodine value of the granular activated carbon is not less than 650 mg / g; and the specific surface area of ​​the granular activated carbon is not less than 750 m² / g. When the filler in the sealing mesh plate is activated carbon fiber cotton, the specific surface area of ​​the activated carbon fiber cotton is not less than 1100 m² / g.

[0010] The inert gas vent on the upper surface of the aforementioned housing is connected to the inert foam chamber. A material valve is installed at the outlet of the inert foam chamber. A first temperature sensor is installed in the temperature sampling component hole on the upper surface of the housing. An electronic fresh air control valve is installed in the air inlet of the electronic fresh air control valve on the upper surface of the housing. An explosion vent is installed in the explosion vent mounting hole on the upper surface of the housing. An explosion suppression device is installed in the explosion suppression device mounting hole on the front end of the housing. A differential pressure sensor is installed in the differential pressure sampling component hole on the front end of the housing. The explosion vent is made of grooved stainless steel with a flameless design. The explosion vent has a straight-through unidirectional flow structure. The explosion vent is connected to the housing of the peak shaving device via a flange. The explosion vent pressure is set to 5-7.5 kPa, with a maximum of 10 kPa. The explosion suppression device contains an explosion suppressant. The activation time of the explosion suppression device is less than 1.5 milliseconds. The release time of the explosion suppressant in the explosion suppression device is 30-85 milliseconds.

[0011] A fire damper is installed on the pipe connecting the auxiliary fan and the outlet of the peak shaving device in the aforementioned fire and explosion prevention module; an explosion-proof valve is installed on the pipe between the peak shaving device and the waste gas treatment equipment. The explosion-proof valve is installed on the pipe 3m-4m away from the inlet of the peak shaving device, and is connected to the pipe via a flange. The explosion-proof valve is placed horizontally; a spark arrester is installed on the pipe between the explosion-proof valve and the waste gas treatment equipment. After the spark arrester triggers an alarm signal, it injects inert gas into the pipe; the spark arrester and the waste gas... The spark detector is installed on the pipeline between the processing equipment. The distance between the spark detector and the spark extinguisher is 9m-12m. The reaction time of the spark detector to capture the infrared light emitted by the spark in the pipeline and trigger the alarm signal is less than 0.1 seconds. A second temperature sensor is also installed on the pipeline connecting the auxiliary fan and the outlet of the peak shaving device. The spark extinguisher sprays inert gas into the pipeline after it is started. The auxiliary fan is an explosion-proof motor. The auxiliary fan adopts a spark-free treatment, and the outlet of the auxiliary fan adopts a spark-free treatment.

[0012] The aforementioned waste gas peak reduction module, explosion prevention module, and waste gas treatment device are connected by pipelines. The components within the waste gas peak reduction module and the explosion prevention module are connected by pipelines. The pipelines are equipped with anti-static grounding and are made of wear-resistant carbon steel.

[0013] A method for reducing peak concentrations of exhaust gases from ship painting processes, the method specifically includes the following steps:

[0014] The first step is to prepare a fire and explosion prevention peak reduction system. This system includes an exhaust gas peak reduction module and a fire and explosion prevention module. The exhaust gas peak reduction module is connected to the exhaust gas treatment device, and the fire and explosion prevention module is connected to the exhaust gas peak reduction module. The exhaust gas peak reduction module includes a side-suction bucket-shaped exhaust hood, a first electric air valve, a second electric air valve, a peak reduction device, and a third electric air valve. The fire and explosion prevention module includes an inert foam chamber, an electromagnetic inlet valve, a fourth electric air valve, a fifth electric air valve, and an auxiliary fan. The side-suction bucket-shaped exhaust hood is connected to the exhaust gas impeller inlet through the second electric air valve. The side-suction bucket-shaped exhaust hood is connected to the peak reduction device... The device inlet is connected to the first electric air valve; the peak shaving device outlet is connected to the exhaust gas impeller via the third electric air valve; the electromagnetic air inlet valve is connected to the inert foam chamber; the inert foam chamber is connected to the peak shaving device; the exhaust gas treatment equipment is connected to the peak shaving device via a pipeline; the pipeline connecting the exhaust gas treatment equipment and the peak shaving device is equipped with the fourth electric air valve; the peak shaving device outlet is connected to the auxiliary fan inlet via the fifth electric air valve; the auxiliary fan outlet is connected to the exhaust gas treatment equipment; the side-suction bucket-shaped exhaust hoods are installed on both sides of the ship painting workshop.

[0015] The second step is to open the second electric air valve after the fire and explosion prevention peak reduction system is installed. The exhaust gas peak reduction module and the fire and explosion prevention module are in standby mode. The volatile organic compounds generated in the ship painting workshop enter the exhaust gas treatment device through the side suction bucket exhaust hood for treatment and are then discharged through the chimney.

[0016] The third step is when the concentration of volatile organic compounds (VOCs) in the ship painting workshop exceeds 1500 mg / m³. 3 At this time, the second electric air valve is closed, and the first and third electric air valves are opened. The volatile organic compounds (VOCs) generated in the ship painting workshop enter the peak-shaving device in the peak-shaving module through the side-suction bucket-shaped exhaust hood. The VOCs concentration is reduced to 1500 mg / m³ by the peak-shaving plates within the device. 3 It is then treated by an exhaust gas treatment device before being discharged through a chimney;

[0017] The fourth step is to reduce the concentration of volatile organic compounds (VOCs) in the ship painting workshop to 1500 mg / m³. 3 Then, open the second, fourth, and fifth electric air valves, close the first and third electric air valves, and turn on the auxiliary fan. The dry hot air in the waste gas treatment equipment enters the peak shaving device through the pipeline. The dry hot air desorbs the filler in the peak shaving plate of the peak shaving device. After the dry hot air desorbs the peak shaving device, it enters the waste gas treatment equipment through the auxiliary fan for decomposition treatment and is discharged through the chimney.

[0018] Fifth step: After the peak shaving device is desorbed, close the fourth electric air valve. The air outside the peak shaving device enters the peak shaving device through the electronic fresh air control valve to rapidly cool the peak shaving device, so that the temperature inside the peak shaving device is reduced to the same temperature as the air outside the peak shaving device.

[0019] Step 6: When the peak shaving device is performing desorption, if an abnormal operating condition occurs in the pipeline between the waste gas treatment equipment and the peak shaving device or in the peak shaving device (sparks, smoldering, or explosion are detected, or the desorption drying hot air exceeds the set temperature range), the second temperature sensor sends an abnormal temperature signal in the pipeline to the spark detector. The spark detector captures the infrared light emitted by the sparks, smoldering, or explosion in the pipeline and sends an alarm signal to the spark extinguisher. After receiving the alarm signal from the spark detector, the spark extinguisher releases inert gas into the pipeline to extinguish the sparks in the pipeline.

[0020] Step 7: When the spark extinguisher releases inert gas into the pipeline but fails to extinguish the sparks in the pipeline, or when sparks appear or the peak shaving device is in a smoldering state; the first temperature sensor on the housing sends an abnormal temperature signal to the explosion suppression device, which then issues an alarm and feeds the alarm signal back to the electromagnetic air intake valve. The electromagnetic air intake valve is opened, allowing compressed air to enter the inert foam chamber through the electromagnetic air intake valve. Simultaneously, the material valve is opened, and the compressed air drives the inert gas in the inert foam chamber to enter the peak shaving device through the pipeline. At the same time, the explosion suppression device in the peak shaving device is activated to release the explosion suppressant. The fire damper and the auxiliary fan are closed, preventing the inert gas in the peak shaving device from entering the waste gas treatment device. Sparks appearing in the peak shaving device or the smoldering state is extinguished, thus extinguishing the sparks in the pipeline between the waste gas treatment equipment and the peak shaving device, or extinguishing the sparks appearing in the peak shaving device or the smoldering state. The pipeline between the waste gas treatment equipment and the peak shaving device and the peak shaving device are then put into normal operating condition, completing the desorption work of the peak shaving device.

[0021] Step 8: After the rapid cooling process by the peak-shaving device is completed, when the concentration of volatile organic compounds generated in the ship painting workshop exceeds 1500 mg / m³ again... 3 Then, repeat steps three through five to reduce the peak concentration of exhaust gas from ship painting.

[0022] In the second step described above, the concentration of volatile organic compounds generated by the second electric air valve in the ship painting workshop is less than 1500 mg / m³. 3 Work is carried out in a timely manner.

[0023] In the fourth step above, when the drying hot air desorbs the peak-shaving device, the temperature of the drying hot air is 80℃-100℃. When the drying hot air desorbs the peak-shaving device, the electronic fresh air control valve on the peak-shaving device is opened to allow air from outside the peak-shaving device to enter the peak-shaving device through the electronic fresh air control valve, so that the temperature inside the peak-shaving device does not exceed 100℃.

[0024] Abnormal operating conditions of the pipeline between the aforementioned waste gas treatment equipment and the peak shaving device or the peak shaving device include the discovery of sparks in the pipeline between the waste gas treatment equipment and the peak shaving device, being in a state of smoldering or explosion, or the desorption drying hot air exceeding the set temperature range; or the discovery of sparks in the peak shaving device, being in a state of smoldering or explosion, or the desorption drying hot air exceeding the set temperature range.

[0025] In the seventh step above, after the explosion suppression device is activated and releases the explosion suppressant, if the pressure inside the peak shaving device exceeds the set pressure value, the explosion relief plate on the peak shaving device will open to release the pressure and reduce the pressure inside the fire-fighting device to less than the set pressure value; the set pressure value inside the peak shaving device is 10 kPa.

[0026] When the aforementioned peak shaving device is working, if the differential pressure sensor on the peak shaving device detects that the pressure difference between the peak shaving device and the external environment is not within the set range, after the peak shaving device finishes working, check the sealing mesh plate in the peak shaving plate inside the peak shaving device and the blockage of the filling material in the sealing mesh plate. Replace or clean the peak shaving plate inside the peak shaving device to restore the pressure difference during the operation of the peak shaving device to normal. The pressure difference setting value of the peak shaving device is set according to the number of peak shaving plates installed inside the peak shaving device.

[0027] Based on the above technical solution, the anti-explosion peak reduction system and method for reducing the peak concentration of exhaust gas from ship painting, as described in this invention patent, has achieved the following technical advantages through practical application:

[0028] 1. This invention provides a fire-prevention and explosion-proof peak-shaving system for reducing the peak concentration of volatile organic compound (VOC) gases generated in ship painting workshops. This system utilizes an exhaust gas peak-shaving module installed before the exhaust gas treatment device. 3 At the same time, the exhaust gas peak reduction module is activated to reduce the concentration of volatile organic compounds. The addition of an anti-explosion module improves the safety of the exhaust gas peak reduction module's operation and enhances the safety of ship painting workshop operations.

[0029] 2. The peak-shaving device in the anti-explosion peak-shaving system for reducing the peak concentration of exhaust gas from ship painting, as described in this invention, is equipped with an explosion relief plate, an explosion suppression device, and a differential pressure sensor, which improves the safety of the peak-shaving device's operation. At the same time, the peak-shaving plate installed in the peak-shaving device is easy to replace and clean, which improves the maintenance efficiency of the peak-shaving device.

[0030] 3. The present invention provides a fire-prevention and explosion-proof peak reduction system for reducing the peak concentration of exhaust gas from ship painting. By setting up spark detectors, spark extinguishers, and inert foam chambers, the system can extinguish fires in a timely manner when they occur in the system pipelines or peak reduction devices, thereby improving the safety of system operation. Attached Figure Description

[0031] Figure 1 This is a structural diagram of the anti-explosion peak reduction system in the anti-explosion peak reduction system for reducing the peak concentration of exhaust gas during ship painting, as described in this invention.

[0032] Figure 2 This is a structural diagram of a peak-shaving device in an anti-explosion peak-shaving system for reducing the peak concentration of exhaust gas from ship painting, according to the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0034] This invention relates to a fire-prevention and explosion-reducing peak system for reducing the peak concentration of exhaust gas during ship painting. The volatile organic compounds (VOCs) generated during the painting process in the ship painting workshop are treated by an exhaust gas treatment device 22 before being discharged. The exhaust gas treatment device 22 includes an exhaust gas impeller 23 and an exhaust gas treatment equipment 24. The VOCs treated by the exhaust gas treatment device 22 are discharged through a chimney.

[0035] like Figure 1-2 The system describes a fire-prevention and explosion-reduction peak-shaving system for reducing the peak concentration of exhaust gas from ship painting. The system includes an exhaust gas peak-shaving module and an explosion-prevention module. The exhaust gas peak-shaving module is connected to the exhaust gas treatment device 22, and the explosion-prevention module is connected to the exhaust gas peak-shaving module. The exhaust gas peak-shaving module includes a side-suction bucket-shaped exhaust hood 1, a first electric air valve 10, a second electric air valve 11, a peak-shaving device 2, and a third electric air valve 12. The explosion-prevention module includes an inert foam chamber 4, an electromagnetic inlet valve 15, a fourth electric air valve 13, a fifth electric air valve 14, and an auxiliary fan 3. The side-suction bucket-shaped exhaust hood 1 is connected to the inlet of the exhaust gas impeller 23 via the second electric air valve 11, and the side-suction bucket-shaped exhaust hood 1 is connected to the inlet of the peak-shaving device 2 via the first electric air valve 10. The outlet of the exhaust gas treatment device 22 is connected to the exhaust gas impeller 23 via the third electric air valve 12. The electromagnetic air inlet valve 15 is connected to the inert foam chamber 4. Compressed air enters the inert foam chamber 4 through the electromagnetic air inlet valve 15. The inert foam chamber 4 is connected to the peak shaving device 2. The exhaust gas treatment device 24 is connected to the peak shaving device 2 via a pipeline. The pipeline connecting the exhaust gas treatment device 24 and the peak shaving device 2 is equipped with the fourth electric air valve 13. The outlet of the peak shaving device 2 is connected to the inlet of the auxiliary fan 3 via the fifth electric air valve 14. The outlet of the auxiliary fan 3 is connected to the exhaust gas treatment device 24. An exhaust gas peak shaving module is installed before the exhaust gas treatment device 22. When the concentration of volatile organic compounds generated in the ship painting workshop exceeds 1500 mg / m³, the peak shaving module is used. 3 At the same time, the exhaust gas peak reduction module is activated to reduce the concentration of volatile organic compounds. The addition of an anti-explosion module improves the safety of the exhaust gas peak reduction module's operation and enhances the safety of ship painting workshop operations.

[0036] The aforementioned peak shaving device 2 includes a housing 313 and peak shaving plates 32. The housing 313 has an inlet and an outlet on both sides. The inlet is connected to the first electric air valve 10 and the fourth electric air valve 13, respectively, and the outlet is connected to the third electric air valve 12 and the fifth electric air valve 14, respectively. The upper surface of the housing 313 has an inert gas port 37, a temperature source component port 38, an electronic fresh air control valve inlet 39, and a burst relief plate mounting hole 310. The front surface of the housing 313 has multiple slots, and the peak shaving plates 32 are installed in these slots. Each peak shaving plate 32 has threaded abutments 33 on both sides of the housing 313. The peak-shaving plate 32 is connected and fixed to the housing 313 by the threaded abutment plate 33. The front end face of the housing 313 is also provided with an explosion suppression device mounting hole 35 and a differential pressure source component hole 36. The peak-shaving device 2 is in a negative pressure state when it is working. The explosion relief plate 9, the explosion suppression device 18 and the differential pressure sensor 19 are provided in the peak-shaving device 2 to improve the safety of the operation of the peak-shaving device 2. At the same time, the peak-shaving plate 32 provided in the peak-shaving device 2 is easy to replace and clean, which improves the maintenance efficiency of the peak-shaving device 2. The negative pressure state when the peak-shaving device 2 is working allows the outside air to automatically enter the peak-shaving device 2 when the electronic fresh air control valve 16 is opened, controlling the temperature of the peak-shaving device 2 within the normal range and improving the efficiency of the rapid cooling of the peak-shaving device 2.

[0037] The aforementioned peak-shaving plate 32 is generally rectangular in shape. The peak-shaving plate 32 includes a sealing cover plate 31 and a sealing mesh plate. The sealing cover plate 31 is located on one side of the peak-shaving plate 32, and is surrounded by corrosion-resistant and high-temperature resistant rubber rings. A handle 34 is provided on the sealing cover plate 31, allowing the peak-shaving plate 32 to be pushed into or pulled out of the slot on the housing 313 by pushing or pulling the handle 34. Multiple through holes are evenly distributed on the end face of the sealing mesh plate. A support rod and filler 311 are provided inside the sealing mesh plate, with the support rod fixing the filler 311 to the sealing mesh plate. Limiting slides 312 are provided on both sides of the peak-shaving plate 32, allowing the peak-shaving plate 32 to be pushed into or pulled out of the slot on the housing 313 via the limiting slides 312. The corrosion-resistant and high-temperature resistant rubber rings around the sealing cover plate 31 improve the airtightness between the sealing cover plate 31 and the housing 313 during installation, thus improving the working effect of the peak-shaving device 2.

[0038] The threaded abutment plate 33 is generally elongated. The fixed end of the threaded abutment plate 33 is fixed to both sides of the plate groove of the housing 313 by bolts. The free end of the threaded abutment plate 33 rotates around the bolts. When the peak-cutting plate 32 is pushed into the plate groove of the housing 313, the threaded abutment plate 33 is rotated so that the free end of the threaded abutment plate 33 is located on the sealing cover plate 31. The bolts are tightened so that the threaded abutment plate 33 fixes the peak-cutting plate 32 in the plate groove of the housing 313.

[0039] When the filler 311 in the sealing mesh plate is granular activated carbon, the iodine value of the granular activated carbon is not less than 800 mg / g; when the filler 311 in the sealing mesh plate is honeycomb activated carbon, the iodine value of the granular activated carbon is not less than 650 mg / g and the specific surface area of ​​the granular activated carbon is not less than 750 m² / g; when the filler 311 in the sealing mesh plate is activated carbon fiber cotton, the specific surface area of ​​the activated carbon fiber cotton is not less than 1100 m² / g.

[0040] An inert gas vent 37 on the upper surface of the aforementioned housing 313 is connected to the inert foam chamber 4. A material valve 21 is installed at the outlet of the inert foam chamber 4. A first temperature sensor 17 is installed in the temperature source hole 38 on the upper surface of the housing 313. An electronic fresh air control valve 16 is installed in the electronic fresh air control valve inlet 39 on the upper surface of the housing 313. A burst relief plate 9 is installed in the burst relief plate mounting hole 310 on the upper surface of the housing 313. A burst suppression device 18 is installed in the burst suppression device mounting hole 35 on the front end face of the housing 313. A differential pressure sensor 19 is installed in the differential pressure source hole 36 on the end face; the explosion relief disc 9 is made of stainless steel with grooves and is flameless; the explosion relief disc 9 has a straight-through unidirectional flow structure; the explosion relief disc 9 is connected to the housing 313 of the peak shaving device 2 by a flange; the explosion relief pressure of the explosion relief disc 9 is set to 5-7.5 kPa, with a maximum of 10 kPa; the explosion suppression device 18 contains an explosion suppressant; the activation time of the explosion suppression device 18 is less than 1.5 milliseconds; the release time of the explosion suppressant in the explosion suppression device 18 is 30-85 milliseconds.

[0041] A fire damper 5 is installed on the pipe connecting the auxiliary fan 3 and the outlet of the peak shaving device 2 in the aforementioned fire and explosion prevention module; an explosion-proof valve 6 is installed on the pipe between the peak shaving device 2 and the waste gas treatment equipment 24. The explosion-proof valve 6 is installed on the pipe 3m-4m away from the inlet of the peak shaving device 2, and is connected to the pipe via a flange. The explosion-proof valve 6 is placed horizontally; a spark extinguisher 7 is installed on the pipe between the explosion-proof valve 6 and the waste gas treatment equipment 24. After the spark extinguisher 7 triggers an alarm signal, it injects inert gas into the pipe; a spark detector 8 is installed on the pipe between the spark extinguisher 7 and the waste gas treatment equipment 24. The distance between the spark detector 8 and the spark extinguisher 7 is 9m-12m. The reaction time of the spark detector 8 in capturing the infrared light emitted by the spark in the pipeline and triggering the alarm signal is less than 0.1 seconds. A second temperature sensor 20 is also installed on the pipeline connecting the auxiliary fan 3 and the outlet of the peak shaving device 2. The spark extinguisher 7 sprays inert gas into the pipeline after starting. The auxiliary fan 3 is an explosion-proof motor. The auxiliary fan 3 adopts a spark-free treatment, and the outlet of the auxiliary fan 3 adopts a spark-free treatment. The installation of the spark detector 8, the spark extinguisher 7, and the inert foam chamber 4 can extinguish the fire in time when a fire occurs in the system pipeline or the peak shaving device 2, thereby improving the safety of system operation.

[0042] The aforementioned waste gas peak reduction module, explosion prevention module, and waste gas treatment device 22 are connected by pipelines. The components within the waste gas peak reduction module and the explosion prevention module are also connected by pipelines. The pipelines are equipped with anti-static grounding and are made of wear-resistant carbon steel. The anti-static grounding of the pipelines improves the safety of system operation.

[0043] A method for reducing peak concentrations of exhaust gases from ship painting processes, the method specifically includes the following steps:

[0044] The first step is to prepare a fire and explosion prevention peak reduction system. This system includes a waste gas peak reduction module and a fire and explosion prevention module. The waste gas peak reduction module is connected to the waste gas treatment device 22, and the fire and explosion prevention module is connected to the waste gas peak reduction module. The waste gas peak reduction module includes a side-suction bucket-shaped exhaust hood 1, a first electric air valve 10, a second electric air valve 11, a peak reduction device 2, and a third electric air valve 12. The fire and explosion prevention module includes an inert foam chamber 4, an electromagnetic air inlet valve 15, a fourth electric air valve 13, a fifth electric air valve 14, and an auxiliary fan 3. The side-suction bucket-shaped exhaust hood 1 is connected to the inlet of the waste gas impeller 23 through the second electric air valve 11, and the side-suction bucket-shaped exhaust hood 1 is connected to the peak reduction device. The inlet of the ship painting workshop is connected to the first electric air valve 10. The outlet of the peak shaving device 2 is connected to the exhaust gas impeller 23 through the third electric air valve 12. The electromagnetic air inlet valve 15 is connected to the inert foam chamber 4. The inert foam chamber 4 is connected to the peak shaving device 2. The exhaust gas treatment equipment 24 is connected to the peak shaving device 2 through a pipeline. The pipeline connecting the exhaust gas treatment equipment 24 and the peak shaving device 2 is equipped with the fourth electric air valve 13. The outlet of the peak shaving device 2 is connected to the inlet of the auxiliary fan 3 through the fifth electric air valve 14. The outlet of the auxiliary fan 3 is connected to the exhaust gas treatment equipment 24. The side-suction bucket-shaped exhaust hoods are installed on both sides of the ship painting workshop.

[0045] The second step is to open the second electric air valve 11 after the fire and explosion prevention peak reduction system is installed. The exhaust gas peak reduction module and the fire and explosion prevention module are in standby mode. The volatile organic compounds generated in the ship painting workshop enter the exhaust gas treatment device 22 through the side suction bucket exhaust hood for treatment and then are discharged through the chimney.

[0046] The third step is when the concentration of volatile organic compounds (VOCs) in the ship painting workshop exceeds 1500 mg / m³. 3 At this time, the second electric air valve 11 is closed, and the first electric air valve 10 and the third electric air valve 12 are opened. The volatile organic compounds (VOCs) generated in the ship painting workshop enter the peak-shaving device 2 in the peak-shaving module through the side-suction bucket-shaped exhaust hood. The VOCs are reduced to 1500 mg / m³ by the peak-shaving plate 32 in the peak-shaving device 2. 3 After being treated by the exhaust gas treatment device 22, it is then discharged through the chimney.

[0047] The fourth step is to reduce the concentration of volatile organic compounds (VOCs) in the ship painting workshop to 1500 mg / m³. 3Then, open the second electric air valve 11, the fourth electric air valve 13 and the fifth electric air valve 14, close the first electric air valve 10 and the third electric air valve 12, and turn on the auxiliary fan 3. The dry hot air in the exhaust gas treatment equipment 24 enters the peak shaving device 2 through the pipeline. The dry hot air desorbs the filler 311 in the peak shaving plate 32 in the peak shaving device 2. After the dry hot air desorbs the peak shaving device 2, it enters the exhaust gas treatment equipment 24 through the auxiliary fan 3 for decomposition treatment and is discharged through the chimney.

[0048] Fifth step: After the peak shaving device 2 is desorbed, the fourth electric air valve 13 is closed. The external air of the peak shaving device 2 enters the peak shaving device 2 through the electronic fresh air control valve 16 to rapidly cool the peak shaving device 2, so that the temperature inside the peak shaving device 2 is reduced to the same temperature as the external air of the peak shaving device 2.

[0049] Step 6: When the peak shaving device 2 is performing desorption, if the pipeline between the waste gas treatment equipment 24 and the peak shaving device 2 or the peak shaving device 2 experiences abnormal operating conditions (sparks, smoldering, or explosion, or the desorption drying hot air exceeds the set temperature range), the second temperature sensor 20 sends an abnormal temperature signal inside the pipeline to the spark detector 8. The spark detector 8 captures the infrared light emitted by the sparks, smoldering, or explosion in the pipeline and sends an alarm signal to the spark extinguisher 7. After receiving the alarm signal from the spark detector 8, the spark extinguisher 7 releases inert gas into the pipeline to extinguish the sparks inside the pipeline.

[0050] Step 7: When the spark extinguisher 7 releases inert gas into the pipeline but fails to extinguish the sparks in the pipeline, or when sparks appear or the peak shaving device 2 is in a smoldering state; the first temperature sensor 17 on the housing 313 sends an abnormal temperature signal to the explosion suppression device 18, the explosion suppression device 18 issues an alarm and feeds back the alarm signal to the electromagnetic air intake valve 15, opens the electromagnetic air intake valve 15 to allow compressed air to enter the inert foam chamber 4 through the electromagnetic air intake valve 15, and at the same time opens the material valve 21, the compressed air drives the inert gas in the inert foam chamber 4 to enter through the pipeline. Inside the peak shaving device 2, the explosion suppression device 18 in the peak shaving device 2 is activated to release the explosion suppressant. The fire damper 5 and the auxiliary fan 3 are closed to prevent the inert gas in the peak shaving device 2 from entering the waste gas treatment device 22. Sparks or smoldering in the peak shaving device 2 are extinguished, and sparks in the pipeline between the waste gas treatment equipment 24 and the peak shaving device 2 are extinguished, or sparks or smoldering in the peak shaving device 2 are extinguished. The pipeline between the waste gas treatment equipment 24 and the peak shaving device 2 and the peak shaving device 2 are brought to normal working condition, completing the desorption work of the peak shaving device 2.

[0051] Step 8: After the rapid cooling process by the peak-shaving device 2 is completed, when the concentration of volatile organic compounds generated in the ship painting workshop exceeds 1500 mg / m³ again... 3 Then, repeat steps three through five to reduce the peak concentration of exhaust gas from ship painting.

[0052] In the second step described above, the concentration of volatile organic compounds generated by the second electric air valve 11 in the ship painting workshop is less than 1500 mg / m³. 3 Work is carried out in a timely manner.

[0053] In the fourth step above, when the drying hot air desorbs the peak-shaving device 2, the temperature of the drying hot air is 80℃-100℃. When the drying hot air desorbs the peak-shaving device 2, the electronic fresh air control valve 16 on the peak-shaving device 2 is opened, allowing air from outside the peak-shaving device 2 to enter the peak-shaving device 2 through the electronic fresh air control valve 16, so that the temperature inside the peak-shaving device 2 does not exceed 100℃. The drying hot air can improve the desorption effect on the peak-shaving device 2 and improve the working effect of the peak-shaving device 2.

[0054] Abnormal operating conditions of the pipeline between the aforementioned waste gas treatment equipment 24 and the peak shaving device 2 or the peak shaving device 2 include the discovery of sparks in the pipeline between the waste gas treatment equipment 24 and the peak shaving device 2, being in a state of smoldering or explosion, or the desorption drying hot air exceeding the set temperature range; or the discovery of sparks in the peak shaving device 2, being in a state of smoldering or explosion, or the desorption drying hot air exceeding the set temperature range.

[0055] In the seventh step above, after the explosion suppression device 18 is activated and releases the explosion suppressant, the pressure inside the peak shaving device 2 exceeds the set pressure value. Then, the explosion relief disc 9 on the peak shaving device 2 opens to release the pressure inside the fire-fighting device, reducing the pressure inside the device to less than the set pressure value. The set pressure value inside the peak shaving device 2 is 10 kPa.

[0056] When the aforementioned peak-shaving device 2 is working, if the differential pressure sensor 19 on the peak-shaving device 2 detects that the pressure difference between the peak-shaving device 2 and the external environment is not within the set range, after the peak-shaving device 2 has finished working, check the sealing mesh plate in the peak-shaving plate 32 inside the peak-shaving device 2 and the blockage of the filler 311 in the sealing mesh plate. Replace or clean the peak-shaving plate 32 inside the peak-shaving device 2 to restore the pressure difference during the operation of the peak-shaving device 2 to normal. The pressure difference setting value of the peak-shaving device 2 is set according to the number of peak-shaving plates 32 installed inside the peak-shaving device 2.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A fire-prevention and explosion-reducing peak-shaving system for reducing the peak concentration of exhaust gas during ship painting, wherein volatile organic compounds (VOCs) generated during painting in the ship painting workshop are treated by an exhaust gas treatment device (22) before being discharged, the exhaust gas treatment device (22) comprising an exhaust gas impeller (23) and exhaust gas treatment equipment (24), and the VOCs treated by the exhaust gas treatment device (22) are discharged through a chimney, characterized in that, The system includes a waste gas peak reduction module and a fire and explosion prevention module. The waste gas peak reduction module is connected to the waste gas treatment device (22), and the fire and explosion prevention module is connected to the waste gas peak reduction module. The waste gas peak reduction module includes a side-suction bucket-shaped exhaust hood (1), a first electric air valve (10), a second electric air valve (11), a peak reduction device (2), and a third electric air valve (12). The fire and explosion prevention module includes an inert foam chamber (4), an electromagnetic air inlet valve (15), a fourth electric air valve (13), a fifth electric air valve (14), and an auxiliary fan (3). The side-suction bucket-shaped exhaust hood (1) is connected to the inlet of the waste gas impeller (23) through the second electric air valve (11), and the side-suction bucket-shaped exhaust hood (1) is connected to the inlet of the peak reduction device (2) through the first electric air valve (12). 0) Connection, the outlet of the peak shaving device (2) is connected to the exhaust gas impeller (23) through the third electric air valve (12), the electromagnetic air inlet valve (15) is connected to the inert foam chamber (4), compressed air enters the inert foam chamber (4) through the electromagnetic air inlet valve (15), the inert foam chamber (4) is connected to the peak shaving device (2), the exhaust gas treatment equipment (24) is connected to the peak shaving device (2) through a pipeline, the pipeline connecting the exhaust gas treatment equipment (24) and the peak shaving device (2) is equipped with the fourth electric air valve (13), the outlet of the peak shaving device (2) is connected to the inlet of the auxiliary fan (3) through the fifth electric air valve (14), the outlet of the auxiliary fan (3) is connected to the exhaust gas treatment equipment (24); The peak shaving device (2) includes a housing (313) and a peak shaving plate (32). The housing (313) has an inlet and an outlet for the peak shaving device (2) on both sides. The inlet of the peak shaving device (2) is connected to the first electric air valve (10) and the fourth electric air valve (13) respectively. The outlet of the peak shaving device (2) is connected to the third electric air valve (12) and the fifth electric air valve (14) respectively. The upper surface of the housing (313) is provided with an inert gas hole (37), a temperature source component hole (38), and an electronic fresh air control valve. An air inlet (39) and a deflation plate mounting hole (310) are provided. The front end face of the housing (313) is provided with multiple plate grooves. The peak-shaving plate (32) is installed in the plate groove. Each peak-shaving plate (32) is provided with a threaded abutment plate (33) on both sides of the housing (313). The peak-shaving plate (32) and the housing (313) are connected and fixed by the threaded abutment plate (33). The front end face of the housing (313) is also provided with a deflation device mounting hole (35) and a differential pressure source component hole (36). The peak-shaving device (2) is in a negative pressure state when it is working.

2. The anti-explosion peak reduction system for reducing the peak concentration of exhaust gas during ship painting, as described in claim 1, is characterized in that... The peak-shaving plate (32) is generally rectangular. The peak-shaving plate (32) includes a sealing cover plate (31) and a sealing mesh plate. The sealing cover plate (31) is located on one side of the peak-shaving plate (32). Corrosion-resistant and high-temperature resistant rubber rings are provided around the sealing cover plate (31). A handle (34) is provided on the sealing cover plate (31). By pushing and pulling the handle (34), the peak-shaving plate (32) can be pushed into or pulled out of the slot on the box body (313). Multiple through holes are evenly distributed on the end face of the sealing mesh plate. A support rod and a filler (311) are provided inside the sealing mesh plate. The support rod fixes the filler (311) to the sealing mesh plate. Limiting slides (312) are provided on both sides of the peak-shaving plate (32). The peak-shaving plate (32) can be pushed into or pulled out of the slot on the box body (313) through the limiting slides (312).

3. The anti-explosion peak reduction system for reducing the peak concentration of exhaust gas during ship painting, as described in claim 2, is characterized in that... The threaded abutment plate (33) is generally elongated. The fixed end of the threaded abutment plate (33) is fixed to both sides of the plate groove of the housing (313) by bolts. The free end of the threaded abutment plate (33) rotates around the bolts. When the peak-cutting plate (32) is pushed into the plate groove of the housing (313), the threaded abutment plate (33) is rotated so that the free end of the threaded abutment plate (33) is located on the sealing cover plate (31). The bolts are tightened so that the threaded abutment plate (33) fixes the peak-cutting plate (32) in the plate groove of the housing (313).

4. The anti-explosion peak reduction system for reducing the peak concentration of exhaust gas during ship painting, as described in claim 2, is characterized in that... When the filler (311) in the sealing mesh plate is granular activated carbon, the iodine value of the granular activated carbon is not less than 800 mg / g; when the filler (311) in the sealing mesh plate is honeycomb activated carbon, the iodine value of the granular activated carbon is not less than 650 mg / g; and the specific surface area of ​​the granular activated carbon is not less than 750 m² / g. When the filler (311) in the sealing mesh plate is activated carbon fiber cotton, the specific surface area of ​​the activated carbon fiber cotton is not less than 1100 m² / g.

5. A fire-prevention and explosion-reducing peak-shaving system for reducing the peak concentration of exhaust gas during ship painting, as described in claim 1, is characterized in that... The inert gas hole (37) on the upper end face of the housing (313) is connected to the inert foam chamber (4). The outlet of the inert foam chamber (4) is provided with a material valve (21). The first temperature sensor (17) is installed in the temperature sampling component hole (38) on the upper end face of the housing (313). The electronic fresh air control valve (16) is installed in the electronic fresh air control valve inlet (39) on the upper end face of the housing (313). The explosion relief plate (9) is installed in the explosion relief plate mounting hole (310) on the upper end face of the housing (313). The explosion suppression device mounting hole (35) is provided on the front end face of the housing (313). An explosion suppression device (18) is installed inside the housing (313). A differential pressure sensor (19) is installed in the differential pressure source hole (36) on the front end face of the housing (313). The explosion relief plate (9) is made of stainless steel with grooves and is flameless. The explosion relief plate (9) is a straight-through unidirectional flow structure. The explosion relief plate (9) and the housing (313) of the peak shaving device (2) are connected by a flange. The explosion relief pressure of the explosion relief plate (9) is set to 5-7.5 kPa, with a maximum of 10 kPa. An explosion suppressant is provided inside the explosion suppression device (18). The start-up time of the explosion suppression device (18) is less than 1.5 milliseconds. The release time of the explosion suppressant in the explosion suppression device (18) is 30-85 milliseconds.

6. A fire-prevention and explosion-reducing peak-shaving system for reducing peak concentrations of exhaust gases from ship painting, as described in claim 1, is characterized in that... A fire damper (5) is installed on the pipe connecting the auxiliary fan (3) in the fireproof module to the outlet of the peak shaving device (2); an explosion-proof valve (6) is installed on the pipe between the peak shaving device (2) and the waste gas treatment equipment (24). The explosion-proof valve (6) is installed on the pipe 3m-4m away from the inlet of the peak shaving device (2). The explosion-proof valve (6) is connected to the pipe through a flange and is placed horizontally; a spark extinguisher (7) is installed on the pipe between the explosion-proof valve (6) and the waste gas treatment equipment (24). After the spark extinguisher (7) triggers an alarm signal, it sprays inert gas into the pipe; the spark extinguisher (7) A spark detector (8) is installed on the pipeline between the auxiliary fan (3) and the exhaust gas treatment equipment (24). The distance between the spark detector (8) and the spark extinguisher (7) is 9m-12m. The reaction time of the spark detector (8) to capture the infrared light emitted by the spark in the pipeline and trigger the alarm signal is less than 0.1 seconds. A second temperature sensor (20) is also installed on the pipeline connecting the auxiliary fan (3) and the outlet of the peak shaving device (2). The spark extinguisher (7) sprays inert gas into the pipeline after starting. The auxiliary fan (3) is an explosion-proof motor. The auxiliary fan (3) adopts a spark-free treatment. The outlet of the auxiliary fan (3) adopts a spark-free treatment.

7. A fire-prevention and explosion-reducing peak-shaving system for reducing the peak concentration of exhaust gas during ship painting, as described in claim 1, is characterized in that... The exhaust gas peak reduction module, the fire and explosion prevention module, and the exhaust gas treatment device are connected by pipes. The components in the exhaust gas peak reduction module and the fire and explosion prevention module are connected by pipes. The pipes are equipped with anti-static grounding and are made of wear-resistant carbon steel.

8. A method for reducing the peak concentration of exhaust gas from ship painting, employing the anti-flammability and peak-shaving system for reducing the peak concentration of exhaust gas from ship painting as described in any one of claims 1-7, characterized in that, The method specifically includes the following steps: The first step is to prepare a fire and explosion prevention peak reduction system. This system includes a waste gas peak reduction module and a fire and explosion prevention module. The waste gas peak reduction module is connected to the waste gas treatment device (22), and the fire and explosion prevention module is connected to the waste gas peak reduction module. The waste gas peak reduction module includes a side-suction bucket-shaped exhaust hood (1), a first electric air valve (10), a second electric air valve (11), a peak reduction device (2), and a third electric air valve (12). The fire and explosion prevention module includes an inert foam chamber (4), an electromagnetic inlet valve (15), a fourth electric air valve (13), a fifth electric air valve (14), and an auxiliary fan (3). The side-suction bucket-shaped exhaust hood (1) is connected to the inlet of the waste gas impeller (23) through the second electric air valve (11), and the side-suction bucket-shaped exhaust hood (1) is connected to the peak reduction device (2). The outlet is connected to the first electric air valve (10), the outlet of the peak shaving device (2) is connected to the exhaust gas impeller (23) through the third electric air valve (12), the electromagnetic air inlet valve (15) is connected to the inert foam chamber (4), the inert foam chamber (4) is connected to the peak shaving device (2), the exhaust gas treatment equipment (24) is connected to the peak shaving device (2) through a pipeline, the pipeline connecting the exhaust gas treatment equipment (24) and the peak shaving device (2) is equipped with the fourth electric air valve (13), the outlet of the peak shaving device (2) is connected to the inlet of the auxiliary fan (3) through the fifth electric air valve (14), the outlet of the auxiliary fan (3) is connected to the exhaust gas treatment equipment (24); the side suction bucket-shaped exhaust hood is installed on both sides of the ship painting workshop. The second step is to open the second electric air valve (11) after the fire and explosion prevention peak reduction system is installed. The exhaust gas peak reduction module and the fire and explosion prevention module are in standby mode. The volatile organic compounds generated in the ship painting workshop enter the exhaust gas treatment device (22) through the side suction bucket exhaust hood for treatment and then are discharged through the chimney. Third step: When the concentration of volatile organic compounds (VOCs) generated in the ship painting workshop exceeds 1500 mg / m³, the second electric air valve (11) is closed, and the first electric air valve (10) and the third electric air valve (12) are opened. The VOCs generated in the ship painting workshop enter the peak shaving device (2) in the peak shaving module through the side-suction bucket-shaped exhaust hood. The VOCs are reduced to 1500 mg / m³ by the peak shaving plate (32) in the peak shaving device (2), and then treated by the exhaust gas treatment device (22) before being discharged through the chimney. Fourth step: When the concentration of volatile organic compounds generated in the ship painting workshop is reduced to 1500 mg / m³, the second electric air valve (11), the fourth electric air valve (13) and the fifth electric air valve (14) are opened, the first electric air valve (10) and the third electric air valve (12) are closed, the auxiliary fan (3) is turned on, and the dry hot air in the exhaust gas treatment equipment (24) enters the peak shaving device (2) through the pipeline. The dry hot air desorbs the filler (311) in the peak shaving plate (32) in the peak shaving device (2). After the dry hot air desorbs the peak shaving device (2), it enters the exhaust gas treatment equipment (24) through the auxiliary fan (3) for decomposition treatment and is discharged through the chimney. Fifth step, after the peak shaving device (2) has completed desorption, the fourth electric air valve (13) is closed. The external air of the peak shaving device (2) enters the peak shaving device (2) through the electronic fresh air control valve (16) to rapidly cool down the peak shaving device (2) so that the temperature inside the peak shaving device (2) is reduced to the same as the temperature of the external air of the peak shaving device (2). Step 6: When the peak shaving device (2) is performing desorption, if the pipeline between the waste gas treatment equipment (24) and the peak shaving device (2) or the peak shaving device (2) experiences abnormal conditions such as the detection of sparks, smoldering, or explosion, or the desorption drying hot air exceeding the set temperature range, the second temperature sensor (20) sends an abnormal temperature signal in the pipeline to the spark detector (8). The spark detector (8) captures the infrared light emitted by the sparks, smoldering, or explosion in the pipeline and sends an alarm signal to the spark extinguisher (7). After receiving the alarm signal from the spark detector (8), the spark extinguisher (7) releases inert gas into the pipeline to extinguish the sparks in the pipeline. Step 7: When the spark extinguisher (7) releases inert gas into the pipeline but fails to extinguish the spark in the pipeline, or when sparks appear or the peak shaving device (2) is in a smoldering state; the first temperature sensor (17) on the housing (313) sends an abnormal temperature signal to the explosion suppression device (18), the explosion suppression device (18) issues an alarm and feeds back the alarm signal to the electromagnetic air intake valve (15), opens the electromagnetic air intake valve (15) to allow compressed air to enter the inert foam chamber (4) through the electromagnetic air intake valve (15), and at the same time opens the material valve (21), the compressed air drives the inert gas in the inert foam chamber (4) to enter the peak shaving device (2) through the pipeline. Inside the peak-shaving device (2), the explosion suppression device (18) in the peak-shaving device (2) is activated to release the explosion suppressant. The fire damper (5) and the auxiliary fan (3) are closed so that the inert gas in the peak-shaving device (2) does not enter the waste gas treatment device (22). The sparks or smoldering state in the peak-shaving device (2) are extinguished, and the sparks in the pipeline between the waste gas treatment equipment (24) and the peak-shaving device (2) are extinguished, or the sparks or smoldering state in the peak-shaving device (2) are extinguished. The pipeline between the waste gas treatment equipment (24) and the peak-shaving device (2) and the peak-shaving device (2) are put into normal working condition, and the desorption work of the peak-shaving device (2) is completed. Step 8: After the peak reduction device (2) has completed the rapid cooling process, when the concentration of volatile organic compounds generated in the ship painting workshop exceeds 1500 mg / m³ again, repeat steps 3 to 5 to complete the reduction of the peak concentration of ship painting exhaust gas.

9. A method for reducing peak concentration of exhaust gas from ship painting according to claim 8, characterized in that, In the second step, the second electric air valve (11) operates when the concentration of volatile organic compounds generated in the ship painting workshop is less than 1500 mg / m³.

10. A method for reducing peak concentration of exhaust gas from ship painting according to claim 8, characterized in that, In the fourth step, when the drying hot air desorbs the peak shaving device (2), the temperature of the drying hot air is 80℃-100℃. When the drying hot air desorbs the peak shaving device (2), the electronic fresh air control valve (16) on the peak shaving device (2) is opened so that the air outside the peak shaving device (2) enters the peak shaving device (2) through the electronic fresh air control valve (16) and keeps the temperature inside the peak shaving device (2) below 100℃.

11. A method for reducing peak concentration of exhaust gas from ship painting according to claim 8, characterized in that, Abnormal operating conditions of the pipeline between the waste gas treatment equipment (24) and the peak shaving device (2) or the peak shaving device (2) include the discovery of sparks in the pipeline between the waste gas treatment equipment (24) and the peak shaving device (2), being in a state of smoldering or explosion, or the desorption drying hot air exceeding the set temperature range; or the discovery of sparks in the peak shaving device (2), being in a state of smoldering or explosion, or the desorption drying hot air exceeding the set temperature range.

12. A method for reducing the peak concentration of exhaust gas from ship painting according to claim 8, characterized in that, In the seventh step, after the explosion suppression device (18) is activated to release the explosion suppressant, the pressure inside the peak shaving device (2) exceeds the set pressure value. Then, the explosion relief plate (9) on the peak shaving device (2) opens to release the pressure inside the peak shaving device (2) so that the pressure inside the peak shaving device (2) is less than the set pressure value. The set pressure value inside the peak shaving device (2) is 10 kPa.

13. A method for reducing peak concentration of exhaust gas from ship painting according to claim 8, characterized in that, When the peak shaving device (2) is working, if the differential pressure sensor (19) on the peak shaving device (2) detects that the pressure difference between the peak shaving device (2) and the external pressure is not within the set range, after the peak shaving device (2) finishes working, check the sealing mesh plate in the peak shaving plate (32) inside the peak shaving device (2) and the blockage of the filling material (311) in the sealing mesh plate, and replace or clean the peak shaving plate (32) inside the peak shaving device (2) so that the pressure difference when the peak shaving device (2) is working returns to normal; the pressure difference setting value of the peak shaving device (2) is set according to the number of peak shaving plates (32) installed inside the peak shaving device (2).

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