Movable type bin sweeping tail gas recovery device based on train oil unloading and using method of movable type bin sweeping tail gas recovery device

Abstract

The invention relates to the field of volatile organic compound treatment, in particular to a movable type bin sweeping tail gas recovery device based on train oil unloading and a using method.The movable type bin sweeping tail gas recovery device comprises a controller, a sensor, an adsorption tank, a mover, a connecting pipe, a quick coupler and an electromagnetic valve, the adsorption tank comprises a tank body, an air inlet, an air outlet and an adsorption material, and the adsorption material is arranged in the tank body; the mover is located between the air inlet and the air outlet, the tank body is placed above the mover, connecting pipes are arranged on the outer sides of the air inlet and the air outlet, quick couplings are arranged on the connecting pipes, the sensor comprises a pressure sensor, the pressure sensor and the electromagnetic valve are both arranged at the air outlet, and the pressure sensor detects pressure and sends a signal to the controller; the controller controls the electromagnetic valve to open and close according to the signal. By arranging the movable bin sweeping tail gas recovery device, the problem that part of oil depot railway oil unloading bin sweeping tail gas treatment is difficult can be solved with low cost, and the purpose of bin sweeping tail gas recovery is achieved on the basis that the fixed building area is not increased.

Description

Technical Field

[0001] The invention relates to the field of volatile organic compound treatment, and in particular to a mobile sweeping tail gas recovery device based on train oil unloading and a use method thereof. Background Art

[0002] According to the 2007 Oil Storage Air Pollutant Emission Standard, oil storages have successively installed and used oil and gas recovery devices to reduce the emission of air pollutants. Oil and gas recovery devices are mainly used to recover oil and gas generated during the oil delivery process by road, railway, and dock. However, when the standard was issued, it did not involve the recovery of railway oil unloading sweeping tanks. In actual operation, enterprises often directly emptied the sweeping tank exhaust gas from the sweeping tank zero-level tank exhaust pipeline without recycling it.

[0003] According to the 2020 standard for atmospheric pollutant emissions from oil storage depots, the standard clearly requires that "the oil and gas generated from the sweep tanks of pumping stations should be collected in a closed manner and sent to the oil and gas treatment device for recovery and treatment". After the release of this standard, existing oil storage depots have two conventional practices based on the previous standards. The first is to collect the sweep tail gas in a closed manner and send it to the original fixed oil and gas recovery device. The second is to add a small-capacity fixed oil and gas recovery device near the sweep tank. However, before the release of the 2020 standard, the oil and gas recovery devices for oil storage depots on roads, railways, and docks had been basically renovated, and the oil and gas treatment of the railway oil unloading sweep tanks was not considered during the renovation. The sweep tanks of some companies are far away from the fixed oil and gas recovery devices and pipeline laying is difficult; the crude oil gas recovery device has no sufficient processing capacity, and the introduction of sweep tail gas may cause the risk of excessive emissions during the peak period of oil storage depot shipments. As for the method of adding a fixed oil and gas recovery device near the sweep operation area, the overall cost of the equipment is relatively high. Some oil storage depots have problems such as tight site space and insufficient power load, making it difficult to add a fixed device.

[0004] Patent CN110152449A discloses a mobile oil and gas treatment device and its treatment method, the process principle of which is water-cooled condensation + adsorption + steam regeneration. The device has the advantages of simple structure, low cost and convenient operation, but has high requirements for public engineering conditions, requires circulating water and steam, and is not suitable for the field of oil product depot train unloading and sweeping.

[0005] Patent CN111363582A discloses a mobile jet fuel oil and gas recovery system, the process principle of which is two-stage condensation + adsorption. The device is mainly used for the volatilized oil and gas during the loading and unloading of jet fuel, and can also be used in the field of train oil unloading and sweeping. However, the volatility and light component content of gasoline are significantly higher than that of jet fuel. If this process is used to ensure that the emission meets the standard, the refrigeration capacity of the condensing device needs to be increased and the capacity of the adsorption tank needs to be increased. In addition, the structure of the device itself is relatively complex, which will bring about problems such as increased equipment cost, increased power load, and inconvenient equipment transportation.

[0006] Patent CN101462687A discloses a mobile absorption condensation and adsorption variable-frequency oil and gas recovery method. The device used in the field of train unloading and tank cleaning has problems such as relatively complex device, high equipment cost, large power consumption, and inconvenient equipment transportation.

[0007] In addition, the tank cleaning frequency of the vast majority of oil storage depots by railway is relatively low, generally 4 - 5 times per month, the concentration of the tank cleaning gas is relatively low, the gas volume is small, and the recovery economic benefit is relatively low. Therefore, it is of great significance to study a low-cost oil and gas recovery device for railway unloading and tank cleaning. Summary of the Invention

[0008] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a low-cost, highly flexible, simple-structured and strong-adaptability train unloading and tank cleaning tail gas recovery device and its use method for use under the conditions of low tank cleaning frequency, low total amount and concentration of tank cleaning tail gas.

[0009] Aiming at the above purpose, the technical solution adopted by the present invention is: a mobile tank cleaning tail gas recovery device based on train unloading, including a controller, a sensor, an adsorption tank, a mover, a connecting pipe, a quick coupling, and a solenoid valve. The adsorption tank includes a tank body, an air inlet, an air outlet, and an adsorption material. The air inlet is arranged on one side of the tank body, the air outlet is arranged on the other side of the tank body, and the adsorption material is arranged in the tank body, in the middle of the air inlet and the air outlet. The tank body is placed above the mover. Connecting pipes are arranged outside the air inlet and the air outlet, and quick couplings are arranged on the connecting pipes. The sensor includes a pressure sensor, and both the pressure sensor and the solenoid valve are arranged at the air outlet. The pressure sensor detects the pressure and sends a signal to the controller, and the controller controls the opening and closing of the solenoid valve according to the signal.

[0010] For the above-mentioned mobile tank cleaning tail gas recovery device based on train unloading, the air inlet is connected to the tank cleaning zero-position tank through the connecting pipe and the quick coupling, and the filling height of the adsorption material in the tank body is not lower than the height of the air inlet.

[0011] For the above-mentioned mobile tank cleaning tail gas recovery device based on train unloading, the calculation formula for the usage amount of the adsorption material is: Where: Q represents the mass required for the adsorption material, A represents the non-methane total hydrocarbon concentration of the tank cleaning gas, T represents the cumulative actual purging gasoline time during the tank cleaning process, L represents the tank cleaning flow rate, and w represents the dynamic adsorption rate of the adsorption material.

[0012] The above-mentioned mobile scavenging tail gas recovery device based on train oil unloading, the scavenging zero-position tank includes an exhaust pipeline connected to the scavenging zero-position tank, and a first valve, a second valve, and a third valve are arranged on the exhaust pipeline. The first valve is arranged on the exhaust pipeline. The second valve is connected to the air inlet, and the third valve is connected to the exhaust port. The second valve is arranged at one end of the first valve close to the scavenging zero-position tank, and the third valve is arranged at one end of the first valve far from the scavenging zero-position tank.

[0013] The above-mentioned mobile scavenging tail gas recovery device based on train oil unloading, the adsorption tank is placed horizontally, the air inlet and the exhaust port are arranged on the left and right sides of the tank body, and the adsorption tank further includes a charging port and a discharging port. The charging port is arranged at the top of the tank body, and the discharging port is arranged at the bottom of the tank body.

[0014] The above-mentioned mobile scavenging tail gas recovery device based on train oil unloading, the charging port and the discharging port are arranged at the center line of the tank body, and the diameter of the tank body at the positions where the charging port and the discharging port are arranged is larger than the diameter at the positions where the air inlet and the exhaust port are arranged.

[0015] The above-mentioned mobile scavenging tail gas recovery device based on train oil unloading, the sensor further includes a temperature transmitter, and the temperature transmitter detects the temperature of the adsorption material when the oil and gas recovery structure performs oil and gas recovery and sends a temperature signal to the controller.

[0016] The above-mentioned mobile scavenging tail gas recovery device based on train oil unloading, the mover includes a flat plate, a bracket, and rollers. The bracket is installed above the flat plate, and the rollers are installed below the flat plate. The bracket supports the tank body.

[0017] The above-mentioned mobile scavenging tail gas recovery device based on train oil unloading, the mover further includes a driver, and the driver drives the rollers to move. The driver includes a steering driver and a straight-line driver. The rollers include straight-line wheels and steering wheels. The controller sends a signal to the steering driver, and the steering driver controls the steering wheels to control the moving direction. The controller sends a signal to the straight-line driver, and the straight-line driver controls the straight-line wheels to push the flat plate to move.

[0018] A method for using a mobile scavenging tail gas recovery device based on train oil unloading, the method is carried out by using the mobile scavenging tail gas recovery device based on train oil unloading according to any one of claims 1-9, and includes the following steps:

[0019] S1: Loading. Calculate the minimum usage mass of the adsorption material according to the calculation formula for the usage amount of the adsorption material, and fill the adsorption material into the tank through the loading port. The adsorption material should completely fill the tank.

[0020] S2: Connection. Move the scavenging tail gas recovery device to the side of the scavenging zero tank. Connect the intake port to the second valve on the exhaust pipeline using a connecting pipe, and connect the exhaust port to the third valve on the exhaust pipeline using a connecting pipe. Close the first valve and open the second and third valves.

[0021] S3: Adsorption. The tail gas enters the tank under the action of the scavenging pump, and the adsorption material adsorbs the tail gas in the scavenging zero tank entering the tank.

[0022] S4: Transfer. After adsorption is completed, drive the roller to move the tank to the regeneration device.

[0023] S5: Regeneration. The intake port is connected to the fixed oil and gas recovery pipeline through a connecting pipe, and the fixed oil and gas recovery pipeline sucks the tail gas in the adsorption material into the fixed oil and gas recovery pipeline for regeneration.

[0024] For the usage method of the above-mentioned mobile scavenging tail gas recovery device based on train unloading of oil, step S5 further includes purging. The pressure sensor sends the in-pipe pressure signal to the controller, and the controller opens the solenoid valve for purging according to the pressure signal to improve the regeneration effect of the adsorption material in the tank.

[0025] The beneficial effects of a mobile scavenging tail gas recovery device based on train unloading of oil in the present invention are as follows: By setting up a mobile scavenging tail gas recovery device, the problem of difficult treatment of scavenging tail gas during railway unloading of oil in some oil depots can be solved at a relatively low cost. On the basis of not increasing the fixed building area, the purpose of scavenging tail gas recovery can be achieved. By using connecting pipes to connect with fixed devices such as adsorption, regeneration, and liquefaction, tail gas recovery resources can be obtained. By setting a tank with a wide middle and narrow ends, it can ensure that the adsorption material is evenly placed, and at the same time, the gas entering from one end is evenly distributed, and there will be no "short circuit" of gas. By using a solenoid valve for "purging" the tank, the tail gas in the adsorption material can be thoroughly regenerated. By using the adsorption material calculation formula, the minimum usage amount of the adsorption material placed in the tank can be obtained to prevent insufficient placement of the adsorption material, resulting in weakened adsorption capacity. After the tail gas recovery of the scavenging zero tank is completed, this device can be connected to the existing fixed oil and gas recovery device in the oil depot through the use of connecting pipes and connecting valves to complete the recovery and treatment of oil and gas. Through mobile operation, this device can solve the problem of difficult treatment of scavenging tail gas during railway unloading of oil in some oil depots at a relatively low cost, and the device has a small floor area, low cost, simple operation, low running power, and will not affect the treatment effect of the fixed oil and gas recovery device. Description of the Drawings

[0026] Figure 1 This is the overall structural schematic diagram of the present invention;

[0027] Figure 2 This is the structural schematic diagram of the tank body of the present invention;

[0028] Figure 3 This is the schematic diagram of the adsorption connection between the present invention and the scavenging zero-position tank;

[0029] Figure 4 This is the schematic diagram of the connection between the present invention and the adsorption-absorption regeneration;

[0030] Figure 5 This is the schematic diagram of the connection between the present invention and the absorption-adsorption regeneration;

[0031] Figure 6 This is the schematic diagram of the connection between the present invention and the condensation-adsorption regeneration.

[0032] Explanation of reference numerals: Controller 1, adsorption tank 2, tank body 21, air inlet 22, exhaust port 23, oil and gas recovery structure 24, loading port 25, unloading port 26, mover 3, flat plate 31, support 32, roller 33, connecting pipe 4, quick coupling 5, solenoid valve 6, pressure sensor 71, temperature transmitter 72, scavenging zero-position tank 8, first valve 81, second valve 82, third valve 83, exhaust pipeline 84, fixed oil and gas recovery device 100, modified pipeline 101, vacuum pump 102, fourth electric valve 103, fifth electric valve 104, absorption tower 105. Detailed implementation manners

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described below in conjunction with the detailed implementation manners and the accompanying drawings.

[0034] Embodiment 1

[0035] As Figure 1-2 shown, a mobile scavenging tail gas recovery device based on train unloading of oil includes a controller 1, a sensor, an adsorption tank 2, a mover 3, a connecting pipe 4, a quick coupling 5, and a solenoid valve 6. The connecting pipe uses a metal hose.

[0036] The controller is internally equipped with a single-chip microcomputer control system. The box cover is provided with an alarm, operation buttons, and operation indication buttons. According to the different functions of the mobile scavenging tail gas recovery device in different stages, the single-chip microcomputer control system records the preset instructions, selects the operation buttons, and controls according to different modes. During the working state, the indication buttons display the specific working state.

[0037] The adsorption tank is a horizontal adsorption tank, so as to ensure as uniform gas distribution as possible and avoid situations such as gas "short circuit". The adsorption tank includes a tank body 21, an air inlet 22, an exhaust port 23, an oil and gas recovery structure 24, a charging port 25, and a discharging port 26. The air inlet is arranged on one side of the tank body, and the exhaust port is arranged on the other side of the tank body. The air inlet and the exhaust port are distributed left and right at both ends of the tank body. The charging port is above the tank body, and the discharging port is below the tank body. Usually, it is blocked with a blind plate. After 5 years of use or when the service life is reached and the internal adsorption material needs to be replaced, the adsorption material is unloaded from the discharging port and re-filled from the charging port. When filling, the tank should be filled as much as possible. To facilitate the filling and replacement of the adsorption material, the charging port is located in the upward direction in the middle of the adsorption tank, and the discharging port is located in the downward direction in the middle of the adsorption tank and is equipped with a 90° elbow.

[0038] The interior of the tank body has a rhombus-shaped structure. The charging port and the discharging port are arranged at the center line of the tank body. The diameter of the tank body at the location where the charging port and the discharging port are arranged is larger than the diameter at the location where the air inlet and the exhaust port are arranged.

[0039] The oil and gas recovery structure is arranged in the tank body, located between the air inlet and the exhaust port. The oil and gas recovery structure can use common oil and gas recovery adsorption methods such as an adsorption material adsorption structure and a condensation adsorption structure. In this technical solution, an example is mainly given for the use of an adsorption material for adsorption, and activated carbon is mainly used as the adsorption material.

[0040] When filling the adsorption material into the tank body, the minimum dosage of the adsorption material is calculated according to the type of oil and gas tail gas, the adsorption time, the gas flow rate during tank cleaning, and the self-dynamic adsorption rate of the adsorption material. The calculation formula for the usage amount of the adsorption material is: Where: Q represents the mass required for the adsorption material, A represents the non-methane total hydrocarbon concentration of the tank cleaning gas, T represents the cumulative actual purging gasoline time during the tank cleaning process, L represents the tank cleaning flow rate, and w represents the dynamic adsorption rate of the adsorption material. When filling the adsorption material, it should be at least higher than the horizontal line of the air inlet and the exhaust port.

[0041] The tank body is placed above a mover. Connecting pipes are arranged outside the air inlet and the exhaust port, and quick connectors are arranged on the connecting pipes. The sensor includes a pressure sensor 71 and a temperature transmitter 72. The pressure sensor and the solenoid valve are both arranged at the exhaust port. The pressure sensor detects the pressure and sends a signal to the controller, and the controller controls the opening and closing of the solenoid valve according to the signal. When the solenoid valve is started, it can be automatically opened according to the pressure mainly in the "regeneration" mode for purging the adsorption material to improve the regeneration effect by introducing clean air for backwashing at the end of regeneration. The temperature transmitter detects the temperature of the adsorption material when the oil and gas recovery structure is recovering oil and gas and sends a temperature signal to the controller.

[0042] The mover includes a flat plate 31, a bracket 32, rollers 33, and a driver. The bracket is installed above the flat plate, and the rollers are installed below the flat plate. The bracket supports the tank body, and the driver drives the rollers to move. It can also be driven by an oil depot trailer. At this time, an oil depot trailer hook connection ring is provided in front of the flat plate, and the hook of the trailer is directly installed on the connection ring.

[0043] When using the driver, the driver includes a steering driver and a straight-line driver. The rollers include straight-line wheels and steering wheels. The controller sends signals to the steering driver, and the steering driver controls the steering wheels to control the moving direction. The controller sends signals to the straight-line driver, and the straight-line driver controls the straight-line wheels to push the flat plate to move. The mover can also use an overall equipment load vehicle, and its main function is to move the mobile scavenging tail gas recovery device to the working position.

[0044] As Figure 3 shown, when the mobile scavenging tail gas recovery device described in this technical solution is connected to the scavenging zero-position tank, the air inlet is connected to the scavenging zero-position tank 8 through a connecting pipe and a quick coupling, and the oil and gas recovery structure uses an adsorption material for oil and gas recovery.

[0045] The scavenging zero-position tank includes an exhaust pipeline 84 connected to the scavenging zero-position tank. A first valve 81, a second valve 82, and a third valve 83 are provided on the exhaust pipeline. The first valve is provided on the exhaust pipeline. The second valve is connected to the air inlet, and the third valve is connected to the exhaust port. The second valve is provided at one end of the first valve close to the scavenging zero-position tank, and the third valve is provided at one end of the first valve far from the scavenging zero-position tank.

[0046] The alarm mainly alarms when the temperature transmitter detects that the material temperature during the adsorption process exceeds the set value, or when the pressure during the regeneration process cannot be reduced to the set value. The temperature changer or pressure sensor sends signals to the controller, and the controller controls the alarm to alarm.

[0047] The working modes of the mobile scavenging tail gas recovery device are recorded in the controller, including four modes: adsorption mode, regeneration mode, stop mode, and debugging mode. In the adsorption mode, only the temperature transmitter sends temperature signals to the controller and the alarm is effective, and the solenoid valve does not act; in the regeneration mode, the temperature transmitter alarm and the pressure sensor alarm are both effective, and the solenoid valve will automatically open and close according to the pressure detected by the pressure sensor. After the regeneration mode is completed, the solenoid valve will remain open until the pressure in the tank returns to atmospheric pressure and then automatically jumps to the stop mode; in the stop mode, all alarms are ineffective and the solenoid valve does not act; in the debugging mode, the solenoid valve can be manually opened and closed and does not act automatically, and all alarms are ineffective.

[0048] When in use, the specific method steps are as follows:

[0049] S1: Loading. Calculate the minimum mass of the adsorbent material according to the calculation formula for the usage amount of the adsorbent material, and fill the adsorbent material into the tank through the loading port. The adsorbent material should completely fill the tank.

[0050] S2: Connection. Move the scavenging tail gas recovery device to the side of the scavenging zero tank. Connect the inlet to the second valve on the exhaust pipeline using the quick coupling of the connecting pipe, and connect the exhaust port to the third valve on the exhaust pipeline using the connecting pipe. Close the first valve and open the second and third valves.

[0051] S3: Adsorption. Through the operation buttons of the controller, put the mobile scavenging tail gas recovery device in the adsorption mode. When it is confirmed that the on-site equipment is connected normally and the adsorption mode operation indicator light on the explosion-proof control box is on, the oil storage depot can carry out the railway oil unloading scavenging operation normally. During the scavenging process, the gas enters the tank from the exhaust pipeline of the zero tank through the second valve under the action of the scavenging pump, is adsorbed by the adsorbent material, and then returns to the exhaust pipeline of the zero tank through the exhaust port and the third valve to be discharged up to standard.

[0052] Then maintain this state until the railway oil unloading scavenging is completed. During the adsorption period of the equipment during the scavenging process, pay attention to the temperature of the adsorbent material in the tank. When the temperature is too high, stop the adsorption. After the scavenging is completed, first click the stop button on the controller to put the working mode in the stop mode, then remove the metal hose, and use the quick plug to block the quick couplings of the inlet and exhaust ports of the mobile device to prevent gas volatilization.

[0053] S4: Transfer. After the adsorption is completed, the controller sends a signal to the driver, and the driver drives the roller belt to move the tank to the regeneration device, or uses the oil depot trailer to drag the flatbed to drive the tank to move to the regeneration device.

[0054] S5: Regeneration. Connect the inlet to the fixed oil and gas recovery pipeline through the connecting pipe, and the fixed oil and gas recovery pipeline inhales the tail gas in the adsorbent material into the fixed oil and gas recovery pipeline for regeneration.

[0055] During the regeneration process, the pressure sensor sends the pressure signal in the pipe to the controller, and the controller automatically opens the solenoid valve of the device for purging according to the pressure change. Purging can improve the regeneration effect of the activated carbon in the horizontal tank. When the program determines that the regeneration is completed, the mobile scavenging tail gas recovery device can give a prompt and keep the solenoid valve open. At this time, the fixed oil and gas recovery device can be stopped, and the mobile scavenging tail gas recovery device will restore the pressure through the solenoid valve. When the pressure in the tank returns to atmospheric pressure, the controller controls the mobile scavenging tail gas recovery device to automatically be in the stop state. Then the metal hose can be disconnected, and the inlet of the mobile scavenging tail gas recovery device can be blocked with a quick plug and moved to the vicinity of the scavenging zero tank to wait for the next railway oil unloading scavenging operation.

[0056] When the shipping operation of the oil storage depot stops and the fixed oil and gas recovery device is in the standby state, the mobile tank cleaning tail gas recovery device can be connected to the fixed oil and gas recovery device for regeneration. According to the different process principles of the fixed oil and gas recovery device, there are certain differences in the regeneration operation of the mobile tank cleaning tail gas recovery device. Combining with this device, the regeneration processes of the common "adsorption - absorption", "absorption - adsorption", and "condensation - adsorption" process principles of the three common fixed oil and gas recovery devices in the oil storage depot are discussed.

[0057] In the above three methods, the fixed devices are all equipped with two adsorption tanks operating alternately. During the regeneration process of the mobile tank cleaning tail gas recovery device, when the emission concentration is close to the emission limit, the valve needs to be manually controlled to switch so that the gas enters the other adsorption tank, ensuring that the fixed device will not exceed the emission standard during the regeneration process of the mobile device. In addition, after the regeneration of the mobile tank cleaning tail gas recovery device is completed and removed, the two adsorption tanks of the fixed device should be regenerated.

[0058] In addition to the above three common functions in the oil storage depot, the fixed devices of the remaining processes must have a regeneration function (such as a vacuum pump), a function of liquefying the regenerated oil and gas (such as an absorption tower, a refrigeration unit, etc.), and a function of ensuring that the liquefied gas emission does not exceed the standard (such as an activated carbon tank, a membrane module, etc.) to regenerate the mobile tank cleaning tail gas recovery device. The regeneration operation of the mobile tank cleaning tail gas recovery device is implemented with reference to the principles of the above three methods, and the mobile tank cleaning tail gas recovery device needs to be connected to the inlet of the vacuum regeneration module and regenerated by means of vacuum pumping.

[0059] The specific examples are as follows.

[0060] Example 2

[0061] The same parts as the above example will not be elaborated here, and the regeneration process of "adsorption - absorption" will be mainly described.

[0062] As Figure 4 shown, the process principle of the fixed oil and gas recovery device in the oil storage depot is "adsorption - absorption". Connect the inlet of the mobile tank cleaning tail gas recovery device to the modified pipeline 101 of the fixed oil and gas recovery device 100 through a metal hose, and the exhaust port is still blocked with a quick - fitting plug. Set the working mode of the mobile tank cleaning tail gas recovery device to the regeneration mode, and at the same time set the fixed oil and gas recovery device to the manual mode. Manually turn on the vacuum pump 102, the fourth electric valve 103, and the fifth electric valve 104 of the fixed device, and at the same time establish a liquid level circulation in the absorption tower 105. The fixed oil and gas recovery device starts to vacuum - regenerate the activated carbon in the adsorption tank of the mobile tank cleaning tail gas recovery device. The regenerated oil and gas enter the absorption tower through the vacuum pump and are absorbed by the absorption tower of the fixed oil and gas recovery device. The unabsorbed oil and gas pass through the adsorption tank of the fixed oil and gas recovery device and are adsorbed and then discharged up to the standard.

[0063] Example 3

[0064] The same parts as those in the above embodiments will not be described again, and the regeneration process of "absorption - adsorption" will be mainly described.

[0065] As Figure 5 shown, the process principle of the fixed - type oil - gas recovery device in the oil storage depot is "absorption - adsorption". The regeneration principle and regeneration operation of the device are the same as those of the "adsorption - absorption" principle device. If the device adopts the "low - temperature absorption - adsorption" process, the refrigeration unit needs to be started first to cool the circulating oil, and regeneration can be carried out after the temperature is stable.

[0066] Example 4

[0067] The same parts as those in the above embodiments will not be described again, and the regeneration process of "condensation - adsorption" will be mainly described.

[0068] As Figure 6 shown, the process principle of the fixed - type oil - gas recovery device in the oil storage depot is "condensation - adsorption". Connect the air inlet of the mobile tank - cleaning tail - gas recovery device to the transformation pipeline of the fixed - type oil - gas recovery device through a metal hose, and the exhaust port is still blocked with a quick - fitting plug. First, put the fixed - type oil - gas recovery device in the manual mode and start the condensation unit for precooling. After precooling, manually turn on the vacuum pump and electric valve of the fixed - type device. At the same time, put the mobile device in the regeneration mode. The fixed - type oil - gas recovery device starts to vacuum - regenerate the activated carbon in the adsorption tank of the mobile tank - cleaning tail - gas recovery device. The regenerated oil - gas enters the refrigeration unit through the vacuum pump for condensation and liquefaction, and the unliquefied oil - gas passes through the adsorption tank of the fixed - type oil - gas recovery device and is adsorbed and discharged up to the standard.

[0069] The above embodiments are only for explaining the inventive concept and features of the present invention, and their purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the essence of the content of the present invention should be covered within the protection scope of the present invention.

Claims

1. A mobile scavenging tail gas recovery device based on train oil unloading, characterized in that: It includes a controller, a sensor, an adsorption tank, a mover, a connecting pipe, a quick connector, and a solenoid valve. The adsorption tank includes a tank body, an air inlet, an air outlet, and an adsorption material. The air inlet is arranged on one side of the tank body, the air outlet is arranged on the other side of the tank body, and the adsorption material is arranged in the tank body, in the middle of the air inlet and the air outlet. The tank body is placed above the mover. Connecting pipes are arranged outside the air inlet and the air outlet, and quick connectors are arranged on the connecting pipes. The sensor includes a pressure sensor. The pressure sensor and the solenoid valve are both arranged at the air outlet. The pressure sensor detects the pressure and sends a signal to the controller, and the controller controls the opening and closing of the solenoid valve according to the signal.

2. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 1, characterized in that: The air inlet is connected to the emptying zero-level tank through the connecting pipe and the quick connector, and the filling height of the adsorption material in the tank body is not lower than the height of the air inlet.

3. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 2, wherein: The calculation formula for the usage amount of the adsorption material is as follows: Where: Q represents the required mass of the adsorption material, A represents the total non-methane hydrocarbon concentration of the purging gas, T represents the cumulative actual purging gasoline time during the purging process, L represents the purging flow rate, and w represents the dynamic adsorption rate of the adsorption material.

4. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 2, characterized in that: The emptying zero-level tank includes an exhaust pipeline connected to the emptying zero-level tank. A first valve, a second valve, and a third valve are arranged on the exhaust pipeline. The first valve is arranged on the exhaust pipeline. The second valve is connected to the air inlet, and the third valve is connected to the air outlet. The second valve is arranged at one end of the first valve close to the emptying zero-level tank, and the third valve is arranged at one end of the first valve far from the emptying zero-level tank.

5. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 2, characterized in that: The adsorption tank is placed horizontally. The air inlet and the air outlet are arranged on the left and right sides of the tank body. The adsorption tank further includes a charging port and a discharging port. The charging port is arranged at the top of the tank body, and the discharging port is arranged at the bottom of the tank body.

6. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 5, wherein: The charging port and the discharging port are arranged at the center line of the tank body, and the diameter of the tank body at the positions where the charging port and the discharging port are arranged is larger than the diameter at the positions where the air inlet and the air outlet are arranged.

7. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 6, wherein: The sensor further includes a temperature transmitter. When the oil and gas recovery structure conducts oil and gas recovery, the temperature transmitter detects the temperature of the adsorption material and sends a temperature signal to the controller.

8. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 7, characterized in that: The mover includes a flat plate, a bracket, and rollers. The bracket is installed above the flat plate, and the rollers are installed below the flat plate. The bracket supports the tank body.

9. The mobile scavenging tail gas recovery device based on train oil unloading according to claim 8, characterized in that: The mover further includes a driver. The driver drives the rollers to move. The driver includes a direction-changing driver and a straight-line driver. The rollers include straight-line wheels and direction-changing wheels. The controller sends a signal to the direction-changing driver, and the direction-changing driver controls the direction-changing wheels to control the moving direction. The controller sends a signal to the straight-line driver, and the straight-line driver controls the straight-line wheels to push the flat plate to move.

10. A method for using a mobile scavenging tail gas recovery device based on train oil unloading, characterized in that, The usage method is carried out by using the mobile emptying tail gas recovery device based on train oil unloading according to any one of claims 1-9, and includes the following steps: S1: Loading. Calculate the minimum usage mass of the adsorption material according to the adsorption material usage amount calculation formula, and fill the adsorption material into the tank body through the charging port. The adsorption material needs to completely fill the tank body. S2: Connection. Move the scavenging tail gas recovery device to the side of the scavenging zero-position tank. Connect the inlet to the second valve on the exhaust pipeline using a connecting pipe, and connect the outlet to the third valve on the exhaust pipeline using a connecting pipe. Close the first valve and open the second and third valves. S3: Adsorption. The tail gas enters the tank under the action of the scavenging pump, and the adsorption material adsorbs the tail gas in the scavenging zero-position tank entering the tank. S4: Transfer. After adsorption is completed, drive the roller to move the tank to the regeneration device. S5: Regeneration. Connect the inlet to the fixed oil and gas recovery pipeline using a connecting pipe. The fixed oil and gas recovery pipeline sucks the tail gas in the adsorption material into the fixed oil and gas recovery pipeline for regeneration.

11. The method for using the mobile scavenging tail gas recovery device based on train oil unloading according to claim 10, characterized in that, Step S5 further includes purging. The pressure sensor sends the in-pipe pressure signal to the controller, and the controller opens the solenoid valve for purging according to the pressure signal to improve the regeneration effect of the adsorption material in the tank.

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