A solvent feeding system

Abstract

The present invention relates to a solvent feeding system, which belongs to the technical field of fine chemical industry, and comprises a solvent barrel, an extraction gun, an air suction hood, an electric upper barrel roller, a metering scale, an electric lower barrel roller, a movable arm, a solvent barrel quantitative nitrogen filling switch, a nitrogen purge switch, an exhaust gas switch valve, an extraction pump, a first mixing tank, a first on-site liquid level gauge, a first nitrogen filling system, a first barrel material feed switch, a first tank area feed switch, a first flame arrester, a first mixer, a first remote liquid level gauge, a second mixing tank, a second on-site liquid level gauge, a second nitrogen filling system, a second barrel material feed switch, a second tank area feed switch, a second flame arrester, a second mixer, a second remote liquid level gauge, a collecting pipe, a collecting pipe exhaust pipe, an exhaust main pipe and a laser light emitter. The solvent feeding system of the present invention makes the feeding of barreled solvents safer, more environmentally friendly and more accurate, reduces the exhaust gas discharge and reduces the production cost through the selection and automatic control of related equipment.

Description

Technical Field

[0001] The invention relates to a solvent feeding system and belongs to the technical field of fine chemical industry. Background Art

[0002] In the field of fine chemical production, there are many intermittent production operations, which involve intermittent input of materials due to their process characteristics. For raw materials with larger quantities, they are generally stored in tank areas. When feeding, flow control is used and pumping is used for closed feeding. This controls leakage and solves safety and environmental protection issues.

[0003] The feeding of a small amount of barreled hazardous materials is all done on-site. The main operation methods are on-site extraction and feeding with a barrel pump and vacuum suction. The feeding methods are all manual operations, the environment is open, the labor intensity is high, it is difficult to control the volatilization of hazardous materials, and there are great safety and environmental risks.

[0004] Vacuum suction is operated under negative pressure. For highly volatile hazardous materials, a large amount of materials are discharged with the vacuum pump and need to be deeply condensed and cooled. Due to the high gas flow rate, a large area of ​​condensation equipment is required for condensation. The tail gas after condensation needs to be treated by a regenerative thermal oxidizer (RTO) to meet the emission requirements. This results in an increase in construction investment and production costs. How to use a small amount of investment to achieve a low labor intensity, safe and environmentally friendly barreled material feeding system is an urgent problem to be solved.

[0005] At present, there are two ways to feed a small amount of barreled hazardous materials: The first way is to first transport the solvent barrel to the extraction site and place it on a manual scale. The mixing kettle is replaced with nitrogen, the relevant process valves are opened, the solvent barrel cover is opened, the barrel pump is inserted into the solvent barrel, the barrel pump is turned on, and the solvent is pumped into the mixing kettle. After loading, the barrel pump is controlled according to the displayed weight of the scale, and the barrel pump is stopped when the weight requirement is reached. When the solvent stock in the solvent barrel is small, the solvent barrel needs to be tilted manually to extract the solvent in the barrel as much as possible to reduce loss. After one barrel is exhausted, the pump is stopped, the barrel pump is manually lifted out, inserted into another barrel, and the operation is repeated. A gas collection hood is set above the solvent barrel to absorb the volatile gas and enter the tail gas treatment. Considering the operation of inserting and extracting the barrel pump, the gas collection hood needs to be installed at a relatively high position. This feeding method is manually operated, and there are problems such as low degree of automation, high labor intensity, large safety hazards without nitrogen protection, and inaccurate measurement affecting production. Since the gas collection hood is relatively large and high, the suction volume is large, which increases the load of tail gas treatment. The second method is: first transport the solvent barrel to the extraction site and place it on the manual scale. Open the relevant process valve, open the solvent barrel cover, insert the extraction tube into the solvent barrel, turn on the vacuum pump, use the negative pressure to suck the solvent into the mixing kettle, and after loading, control the mixing kettle feed valve according to the displayed weight of the scale. When the weight requirement is reached, close the mixing kettle feed valve, stop the vacuum pump, inject nitrogen, remove the negative pressure of the mixing kettle, and proceed to the next step of production. When the solvent stock in the solvent barrel is small, it is necessary to manually tilt the solvent barrel to extract the solvent in the barrel as much as possible to reduce loss. After one barrel is exhausted, manually lift the extraction tube and insert it into another barrel to repeat the operation. A gas collection hood is set above the solvent barrel to absorb the volatile gas and enter the tail gas treatment. Considering the operation of inserting and extracting the extraction tube, the gas collection hood needs to be installed at a relatively high position. Since the vacuum pump is used to suck the material, the solvent evaporates in large quantities under negative pressure conditions and is discharged with the vacuum pump. The tail gas contains a large amount of solvent, and the tail gas needs to be deeply condensed to recover the solvent in the tail gas. This feeding method uses manual operation, and there are also problems such as low degree of automation, high labor intensity, inaccurate measurement, and production impact. Although the mixing kettle can be filled with nitrogen for safety protection, the formation of explosive gas by evacuating the solvent barrel and inhaling air cannot be eliminated, which poses a great safety hazard. Since deep cooling is added after the vacuum pump, the construction investment and production costs are increased. At the same time, the amount of tail gas increases after the vacuum pump is added, and the gas collection hood is relatively large and high, resulting in a large amount of air suction. These factors increase the load of tail gas treatment.

[0006] Therefore, providing a solvent dosing system that, through the selection and automated control of related equipment, makes the dosing of barreled solvents safer, more environmentally friendly, and more accurate, reduces exhaust emissions, and reduces production costs has become a technical problem that needs to be urgently solved in this technical field. Summary of the invention

[0007] The purpose of the present invention is to provide a solvent feeding system, which makes the feeding of barreled solvents safer, more environmentally friendly and accurate, reduces tail gas emissions and reduces production costs through the selection and automatic control of related equipment.

[0008] The above object of the present invention is achieved through the following technical solutions:

[0009] A solvent feeding system, the solvent feeding system includes: a solvent barrel, an extraction gun, a suction hood, an electric upper barrel roller, a metering scale, an electric lower barrel roller, a movable arm, a solvent barrel quantitative nitrogen filling switch, a nitrogen purge switch, an exhaust gas switch valve, an extraction pump, a first mixing tank, a first on-site liquid level meter, a first nitrogen filling system, a first barrel material feeding switch, a first tank area feeding switch, a first flame arrester, a first mixer, a first remote liquid level meter, a second mixing tank, a second on-site liquid level meter, a second nitrogen filling system, a second barrel material feeding switch The second tank area feed switch, the second flame arrester, the second mixer, the second remote level gauge, the liquid collecting pipe, the liquid collecting pipe tail pipe, the tail pipe and the laser light emitter; the extraction gun is fixed to the movable arm; the upper part of the extraction gun is connected to the extraction pump through a pressure hose, and the extraction pump is turned on to extract the material through the extraction gun; the laser light emitter is located in the middle and upper part of the extraction gun and the lower part of the movable arm, and the middle part of the extraction gun is provided with an air suction hood, and the air suction hood is provided with a laser hole; a liquid collecting pipe is provided under the movable arm; a nitrogen purge port is provided on the upper part of the extraction gun; and at the same time, the upper part of the extraction gun is also provided with a A nitrogen filling port is provided, and nitrogen is filled into the solvent barrel through the quantitative nitrogen filling switch of the solvent barrel; the suction hood is connected to the exhaust main pipe, and the connection with the exhaust main pipe is controlled by the exhaust switch valve; the collecting pipe connects the exhaust gas to the exhaust main pipe through the collecting pipe exhaust pipe; the first mixing tank and the second mixing tank are both equipped with on-site and remote liquid level gauges, which are the first on-site liquid level gauge, the second on-site liquid level gauge, the first remote liquid level gauge and the second remote liquid level gauge, respectively, to observe the material situation in the mixing tank through the liquid level; the first remote liquid level gauge and the second remote liquid level gauge are respectively The first and second barrel material feed switches are interlocked with the first barrel material feed switch respectively; the nitrogen filling systems are respectively the first nitrogen filling system and the second nitrogen filling system, and the nitrogen flow rate is controlled according to the pressure in the mixing tank; the tank area feed switches are respectively the first tank area feed switch and the second tank area feed switch, which are interlocked with the first remote liquid level gauge and the second remote liquid level gauge respectively; flame arresters are installed on the exhaust pipe of the mixing tank, which are respectively the first flame arrester and the second flame arrester; each mixing tank is provided with a mixer, which are respectively the first mixer and the second mixer.

[0010] Preferably, the solvent feeding system further comprises electrical appliances, and the electrical appliances are all provided with explosion-proof electrical appliances, explosion-proof control boxes and explosion-proof on-site operation display screens.

[0011] Preferably, the explosion-proof on-site operation display screen is connected to the electric upper barrel roller and the electric lower barrel roller to control the entry and exit of the barrel.

[0012] Preferably, the explosion-proof on-site operation display screen is connected to a metering scale and is interlocked with an extraction pump to control the extraction amount.

[0013] Preferably, the explosion-proof on-site operation display screen is connected to the movable arm to control the position of the extraction gun, and is linked with the laser light emitter to play a role in auxiliary positioning.

[0014] Preferably, the explosion-proof on-site operation display screen is connected to the quantitative nitrogen filling switch of the solvent barrel, and the nitrogen filling is turned on when the extraction pump is started and turned off when the extraction pump is stopped.

[0015] Preferably, the explosion-proof on-site operation display screen is connected to a nitrogen purge switch, which is turned on for purge when the extraction is completed.

[0016] Preferably, the explosion-proof on-site operation display screen is connected to the exhaust gas switch valve and is opened when the solvent barrel reaches the metering scale.

[0017] Preferably, the explosion-proof on-site operation display screen is connected to the extraction pump, and starts when the extraction gun reaches a specified position and stops when a specified amount is reached.

[0018] Preferably, the measuring scale has a tilting function.

[0019] Beneficial effects:

[0020] The solvent feeding system of the present invention makes the feeding of barreled solvents safer, more environmentally friendly and more accurate through the selection and automatic control of relevant equipment, reduces the exhaust gas emission and reduces the production cost.

[0021] The present invention is further described below through the accompanying drawings and specific implementation modes, but it is not intended to limit the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of the structure of a feeding system for a flammable barreled ethyl acetate solvent in a certain enterprise.

[0023] Main parts name:

[0024] 1 Solvent barrel 2 Extraction gun

[0025] 3 Suction hood 4 Electric drum roller

[0026] 5 Measuring scale (with tilt function) 6 Electric lower drum roller

[0027] 7 Movable arm 8 Solvent barrel quantitative nitrogen filling switch

[0028] 9 Nitrogen purge switch 10 Exhaust switch valve

[0029] 11 Extraction pump 12-1 First mixing tank

[0030] 13-1 First on-site liquid level gauge 14-1 First nitrogen filling system

[0031] 15-1 First barrel material feed switch 16-1 First tank area feed switch

[0032] 17-1 First flame arrester 18-1 First mixer

[0033] 19-1 First remote level meter 12-2 Second mixing tank

[0034] 13-2 Second on-site liquid level gauge 14-2 Second nitrogen filling system

[0035] 15-2 Second barrel material feed switch 16-2 Second tank area feed switch

[0036] 17-2 Second flame arrester 18-2 Second mixer

[0037] 19-2 Second remote level gauge 20 Liquid collecting pipe

[0038] 21 Liquid collector tail gas pipe 22 tail gas main pipe

[0039] 23. Laser emitter DETAILED DESCRIPTION

[0040] The present invention can be implemented according to the following examples, but is not limited thereto. These examples are only intended to illustrate the implementation process of the present invention, and are not intended to limit the scope of the present invention in any way. In the following examples, various processes and methods not described in detail are conventional methods known in the art.

[0041] Unless otherwise specified, the equipment or components used in the present invention are conventional equipment or components available on the market in the technical field; and their performance parameters are conventional performance parameters used in the art.

[0042] Example 1

[0043] like Figure 1As shown, it is a schematic diagram of the structure of a feeding system for a flammable barreled ethyl acetate solvent applied to a certain enterprise in accordance with an embodiment of the present invention, wherein 1 is a solvent barrel, 2 is an extraction gun, 3 is an air suction hood, 4 is an electric upper barrel roller, 5 is a metering scale (with a tilting function), 6 is an electric lower barrel roller, 7 is a movable arm, 8 is a quantitative nitrogen filling switch for the solvent barrel, 9 is a nitrogen purge switch, 10 is an exhaust gas switch valve, 11 is an extraction pump, 12-1 is a first mixing tank, 13-1 is a first on-site liquid level gauge, 14-1 is a first nitrogen filling system, 15-1 is a first barrel material feeding switch, 16-1 is a first tank area feeding switch, 17-1 is a first flame arrester, 18-1 is a first mixer, 19-1 is a first remote liquid level gauge, and 12-2 is a second mixing tank , 13-2 is the second on-site liquid level meter, 14-2 is the second nitrogen filling system, 15-2 is the second barrel material feed switch, 16-2 is the second tank area feed switch, 17-2 is the second flame arrester, 18-2 is the second mixer, 19-2 is the second remote liquid level meter, 20 is the liquid collecting pipe, 21 is the liquid collecting pipe tail pipe, 22 is the tail gas main pipe, and 23 is the laser light emitter; the solvent feeding system of the present invention comprises: a solvent barrel 1, an extraction gun 2, an air suction hood 3, an electric upper barrel roller 4, a metering scale (with a tilting function) 5, an electric lower barrel roller 6, a movable arm 7, a solvent barrel quantitative nitrogen filling switch 8, a nitrogen purge switch 9, a tail gas switch valve 10, an extraction pump 11, a first mixing tank 12-1, a first on-site liquid level meter 13-1, a first nitrogen filling System 14-1, first barrel material feed switch 15-1, first tank area feed switch 16-1, first flame arrester 17-1, first mixer 18-1, first remote level gauge 19-1, second mixing tank 12-2, second on-site level gauge 13-2, second nitrogen filling system 14-2, second barrel material feed switch 15-2, second tank area feed switch 16-2, second flame arrester 17-2, second mixer 18-2, second remote level gauge 19-2, liquid collecting pipe 20, liquid collecting pipe tail gas pipe 21, tail gas main pipe 22 and laser light emitter 23; extraction gun 2 is fixed to movable arm 7; the upper part of extraction gun 2 is connected to extraction pump 11 through pressure hose, and extraction pump 11 is turned on to extract material through extraction gun 2; laser light emitter 2 3 is located at the middle and upper part of the extraction gun 2 and the lower part of the movable arm 7. A suction hood 3 is arranged in the middle of the extraction gun 2. The suction hood 3 can slide up and down along the extraction gun 2 but cannot rotate. A laser hole is arranged in the suction hood 3 so that the light beam emitted by the laser illuminator 23 passes through and irradiates the surface of the solvent barrel 1. A liquid collecting pipe 20 is arranged below the movable arm 7 to collect the residual liquid in the extraction gun 2. A nitrogen purge port is arranged at the upper part of the extraction gun 2, and the purge is controlled by the nitrogen purge switch 9. At the same time, a nitrogen filling port is also arranged at the upper part of the extraction gun 2, and nitrogen is filled into the solvent barrel 1 through the solvent barrel quantitative nitrogen filling switch 8. The suction hood 3 is connected to the exhaust main pipe 22, and the connection with the exhaust main pipe is controlled by the exhaust switch valve 10. The liquid collecting pipe 20 connects the exhaust gas to the exhaust main pipe 22 through the liquid collecting pipe exhaust pipe 21.The first mixing tank 12-1 and the second mixing tank 12-2 are both provided with on-site and remote level gauges, namely, a first on-site level gauge 13-1, a second on-site level gauge 13-2, a first remote level gauge 19-1 and a second remote level gauge 19-2, for observing the material conditions in the mixing tanks through the liquid levels. The first remote level gauge 19-1 and the second remote level gauge 19-2 are interlocked with the first barrel material feed switch 15-1 and the second barrel material feed switch 15-2, respectively, and are closed when the material reaches a high level to prevent safety accidents; the nitrogen filling system is set up, namely the first nitrogen filling system 14-1 and the second nitrogen filling system 14-2, and the nitrogen flow rate is controlled according to the pressure in the mixing tank; the tank area feed switch is set up, namely the first tank area feed switch 16-1 and the second tank area feed switch 16-2, respectively, and is interlocked with the first remote level gauge 19-1 and the second remote level gauge 19-2, respectively, and is closed when the material reaches a high level to prevent safety accidents; flame arresters are set up in the tail gas pipeline of the mixing tank, namely the first flame arrester 17-1 and the second flame arrester 17-2, respectively, to prevent backfire and cause safety accidents; each mixing tank is equipped with a mixer, namely the first mixer 18-1 and the second mixer 18-2. ;

[0044] The working principle of the solvent feeding system of the present invention is as follows:

[0045] Before feeding, the first nitrogen filling system 14-1 and the second nitrogen filling system 14-2 are turned on to replace the air in the first mixing tank 12-1 and the second mixing tank 12-2 to a qualified level, and the pressure of the first mixing tank 12-1 and the second mixing tank 12-2 is controlled to maintain a nitrogen environment; the tail gas passes through the first flame arrester 17-1 and the second flame arrester 17-2 and is vented to the tail gas recovery system; according to production requirements, the first tank area feed switch 16-1 or the second tank area feed switch 16-2 is turned on to ensure that the material enters the first mixing tank 12-1 or the second mixing tank 12-2, and the first The mixing tank 12-1 or the second mixing tank 12-2 is respectively provided with a first on-site liquid level meter 13-1, a second on-site liquid level meter 13-2, a first mixer 18-1, a second mixer 18-2, a first remote liquid level meter 19-1, and a second remote liquid level meter 19-2; firstly, the tank area material is quantitatively pumped into the first mixing tank 12-1 or the second mixing tank 12-2; the first tank area feed switch 16-1 or the second tank area feed switch 16-2 is closed; then the first barrel material feed switch 15-1 and the second barrel material feed switch 15-2 are opened to feed the barreled material;

[0046] First, use a forklift to place the solvent barrel 1 on the electric barrel roller 4, and the solvent barrel 1 is automatically transported to the metering scale (with tilting function) 5, and the movable arm 7 is opened to align the extraction gun 2 with the barrel hole of the solvent barrel 1. A laser light emitter 23 is provided on the upper part of the extraction gun 2, and is fixedly linked with the extraction gun 2. The light beam emitted by the laser light emitter 23 is irradiated to the surface of the solvent barrel 1 through the light-transmitting holes of the suction hood 3, and the extraction gun 2 is assisted by the falling light point to accurately align with the barrel hole of the solvent barrel 1 to achieve accurate positioning. The suction hood 3 follows the extraction gun 2 and is also aimed at the barrel hole of the solvent barrel 1, and the suction hood 3 maintains a distance of 150 mm from the barrel hole of the solvent barrel 1; the exhaust gas switch valve 10 is opened to put the suction hood 3 in the suction state, and the barrel cover is opened manually, and the leaked gas is sucked away by the suction hood 3; the extraction gun 2 is controlled to enter the barrel and is about 50 mm below the liquid surface. The extraction gun 2 has a liquid level tracking function. During the extraction process, the extraction gun 2 is always about 50 mm below the liquid surface; the suction hood 3 automatically adjusts its height to the barrel hole; the extraction gun 2 is a jacketed structure, the inner tube is used for solvent extraction, and nitrogen is introduced into the outer tube to enter the solvent barrel 1 for nitrogen protection. Turn on the quantitative nitrogen filling switch 8 of the solvent barrel 1 to allow nitrogen to enter the solvent barrel 1 in a quantitative manner; turn on the metering function of the metering scale (with tilting function) 5 to determine the required amount of material, turn on the extraction pump 11, and extract the solvent in the solvent barrel 1 into the first mixing tank 12-1 or the second mixing tank 12-2; when the required amount of material is reached, the extraction pump 11 automatically stops; when the liquid level in the solvent barrel 1 is too low, affecting the extraction, the metering scale (with tilting function) 5 automatically tilts to ensure that the solvent can be extracted in the maximum amount to reduce loss; after the extraction is completed, turn on the nitrogen purge switch 9 to purge the material in the pipeline to the first mixing tank 12-1 or the second mixing tank 12-2; after the purge is completed, lift the extraction gun 2, and the suction hood 3 moves to a distance of 150mm above the barrel hole of the solvent barrel 1; manually close the barrel cover, turn on the electric lower barrel roller 6, and transport the solvent barrel 1 to the outside of the system; if the material is replaced, the extraction gun 2 can be accurately aligned with the liquid collecting pipe 20 by the light beam falling point emitted by the laser light emitter 23. Insert the extraction gun 2 into the liquid collecting pipe 20, open the bottom valve of the extraction gun 2, and put the residual material into the liquid collecting pipe 20; the residual material is discharged from the bottom discharge valve of the liquid collecting pipe 20, and the liquid collecting pipe 20 is provided with a liquid collecting pipe tail gas pipe 21 on the upper part of the liquid collecting pipe 20, which is connected to the tail gas main pipe 22 of the suction hood 3 and enters the tail gas treatment system.

[0047] All electrical equipment adopts explosion-proof electrical appliances. An explosion-proof control box and an explosion-proof on-site operation display screen are set up on site. The explosion-proof on-site operation display screen is connected to the electric upper barrel roller 4 and the electric lower barrel roller 6 to control the entry and exit of the barrel; it is connected to the metering scale 5 (with tilting function), and is interlocked with the extraction pump 11 to control the extraction amount; it is connected to the movable arm 7 to control the position of the extraction gun 2, and is linked with the laser light emitter 23 to play a role in auxiliary positioning; the explosion-proof on-site operation display screen is connected to the solvent barrel quantitative nitrogen filling switch 8, when the extraction pump 11 is started, the nitrogen filling is turned on, and it is turned off when the extraction pump 11 stops; it is connected to the nitrogen purge switch 9, and it is turned on for purge when the extraction is completed; it is connected to the exhaust gas switch valve 10, and it is turned on when the solvent barrel 1 reaches the metering scale 5 and the extraction gun is aimed at the nozzle for operation; it is connected to the extraction pump 11, and it is turned on when the extraction gun 2 reaches the specified position, and it stops when the specified amount is reached.

[0048] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the above embodiments describe the present invention in detail, relevant technical personnel in the field should understand that the present invention can be modified or equivalently replaced, but any modification and partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A solvent feeding system, characterized in that: Including solvent barrel, extraction gun, suction hood, electric upper barrel roller, metering scale, electric lower barrel roller, movable arm, solvent barrel quantitative nitrogen filling switch, nitrogen purge switch, tail gas switch valve, extraction pump, first mixing tank, first on-site liquid level meter, first nitrogen filling system, first barrel material feed switch, first tank area feed switch, first flame arrester, first mixer, first remote liquid level meter, second mixing tank, second on-site liquid level meter, second nitrogen filling system, second barrel material feed switch, second tank area feed switch, second flame arrester, second mixer, second remote liquid level meter, collecting pipe, collecting The tail gas pipe, tail gas main pipe and laser light emitter are arranged in a pipe; the extraction gun is fixed on the movable arm; the upper part of the extraction gun is connected to the extraction pump through a pressure hose, and the extraction pump is turned on to extract the material through the extraction gun; the laser light emitter is located in the middle and upper part of the extraction gun and the lower part of the movable arm, and an air suction hood is arranged in the middle part of the extraction gun, and a laser hole is arranged in the air suction hood; a liquid collecting pipe is arranged under the movable arm; a nitrogen purge port is arranged on the upper part of the extraction gun; at the same time, a nitrogen filling port is also arranged on the upper part of the extraction gun, and nitrogen is filled into the solvent barrel through the quantitative nitrogen filling switch of the solvent barrel; the air suction hood is connected to the tail gas main pipe, and the connection with the tail gas main pipe is controlled by the tail gas switch valve; the liquid collecting pipe The tail gas is connected to the tail gas main pipe through the collecting pipe tail gas pipe; the first mixing tank and the second mixing tank are both equipped with on-site and remote level gauges, namely the first on-site level gauge, the second on-site level gauge, the first remote level gauge and the second remote level gauge, and the material situation in the mixing tank is observed by the liquid level; the first remote level gauge and the second remote level gauge are interlocked with the first barrel material feed switch and the second barrel material feed switch respectively; the nitrogen filling systems are respectively the first nitrogen filling system and the second nitrogen filling system, and the nitrogen flow rate is controlled according to the pressure in the mixing tank; the tank area feed switches are respectively the first tank area feed switch and the second tank area feed switch. The switch and the second tank area feed switch are interlocked with the first remote liquid level gauge and the second remote liquid level gauge respectively; flame arresters are set on the exhaust pipe of the mixing tank, which are the first flame arrester and the second flame arrester respectively; each mixing tank is provided with a mixer, which are the first mixer and the second mixer respectively; the solvent feeding system also includes electrical appliances, which are equipped with explosion-proof electrical appliances, explosion-proof control box and explosion-proof on-site operation display screen; the explosion-proof on-site operation display screen is connected to the movable arm to control the position of the extraction gun, and is linked with the laser light emitter to play a role in auxiliary positioning; the metering scale has a tilt function.

2. The solvent feeding system according to claim 1, characterized in that: The explosion-proof on-site operation display screen is connected with the electric upper barrel roller and the electric lower barrel roller to control the entry and exit of the barrel.

3. The solvent feeding system according to claim 2, characterized in that: The explosion-proof on-site operation display screen is connected to the metering scale and is interlocked with the extraction pump to control the extraction amount.

4. The solvent feeding system according to claim 3, characterized in that: The explosion-proof on-site operation display screen is connected to the quantitative nitrogen filling switch of the solvent barrel. The nitrogen filling is turned on when the extraction pump is started and is turned off when the extraction pump is stopped.

5. The solvent feeding system according to claim 4, characterized in that: The explosion-proof on-site operation display screen is connected to the nitrogen purge switch, which is turned on for purge when the extraction is completed.

6. The solvent feeding system according to claim 5, characterized in that: The explosion-proof on-site operation display screen is connected to the tail gas switch valve and is turned on when the solvent barrel reaches the metering scale.

7. The solvent feeding system according to claim 6, characterized in that: The explosion-proof on-site operation display screen is connected to the extraction pump, and is started when the extraction gun reaches a specified position and stopped when a specified amount is reached.

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