Adaptive oil and gas emission treatment device and control method based on time-sharing multiplexing control algorithm

Abstract

The present invention relates to an adaptive oil and gas emission treatment device based on a time-sharing multiplexing control algorithm. It includes a plurality of oil and gas adsorption tanks (filled with adsorbents), a plurality of solenoid valves, a vacuum pump, an absorption tank (filled with a portion of gasoline), an oil storage tank, and a pipeline. The plurality of oil and gas adsorption tanks are first connected in series (the series state is used for the oil and gas adsorption process), and one end of the plurality of oil and gas adsorption tanks is connected in parallel (the parallel state is used for the oil and gas desorption process). The structure of this device is simple and easy to control. The multi-stage series structure of the adsorption tank can effectively enhance the adsorption efficiency of oil and gas, and the parallel desorption structure of the adsorption tank can maximize the desorption efficiency, and the adsorption efficiency is increased by 85%. The time-sharing multiplexing of the vacuum pump not only does not reduce the adsorption capacity of the adsorption device during the adsorption stage, but also effectively reduces the adsorption time by 80%. Efficient desorption can also be performed during the desorption stage, making full use of the vacuum pump resources. The adsorption stage of the device of the present invention only accounts for 30-40% of the entire operating cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas recovery and processing, and in particular to an adaptive oil and gas emission processing device and a control method based on a time-sharing multiplexing control algorithm. Background Art

[0002] Oil vapor recovery is a new energy-saving and environmentally friendly technology. It recovers oil vapor emitted during storage, transportation, and loading and unloading, preventing atmospheric pollution caused by volatilization and eliminating safety hazards. By improving energy utilization and minimizing losses, it achieves higher efficiency. Currently, the most common methods include condensation, adsorption, and hybrid adsorption, which combine these methods. However, all methods suffer from low absorption rates and long adsorption cycles. Summary of the Invention

[0003] In order to address the deficiencies of the prior art, the present invention aims to provide a processing device and a control method that can absorb oil and gas to the maximum extent.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] An adaptive oil and gas emission treatment device based on a time-sharing multiplexing control algorithm is characterized by comprising a plurality of oil and gas adsorption tanks (filled with adsorbents), a plurality of solenoid valves, a vacuum pump, an absorption tank, an oil storage tank, and a pipeline;

[0006] The plurality of oil and gas adsorption tanks are first connected in series (the series state is used for the oil and gas adsorption process), and one end of the plurality of oil and gas adsorption tanks are connected in parallel (the parallel state is used for the oil and gas desorption process);

[0007] One end of the first of the plurality of oil and gas adsorption tanks is an air inlet, which is communicated with the oil storage tank; the other end of the last of the plurality of oil and gas adsorption tanks is an exhaust port;

[0008] The solenoid valves are installed on the pipelines between the oil storage tank, the oil and gas adsorption tank, the vacuum pump and the absorption tank respectively, and the pipelines are opened and closed according to the working requirements;

[0009] The vacuum pump is installed between the absorption tank and the parallel ends of several oil and gas absorption tanks;

[0010] The absorption tank is connected to the oil storage tank through a pipeline;

[0011] The system also includes a control system, which controls the speed of the vacuum pump and the opening of several electromagnetic valves to complete the adaptive oil and gas emission processing process based on the time-sharing multiplexing control algorithm.

[0012] Furthermore, the plurality of oil and gas adsorption tanks are two first adsorption tanks and a second adsorption tank, which are connected in series and then connected in parallel at one end.

[0013] Furthermore, there are five solenoid valves, namely, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a fifth solenoid valve; the first adsorption tank and the second adsorption tank are installed and connected in series through a pipeline; the front end of the first adsorption tank is connected to the first solenoid valve through a pipeline, the front end of the first solenoid valve is an air inlet, and the air inlet is connected to the oil storage tank, the outlet end of the second adsorption tank is connected to one end of the second solenoid valve through a pipeline, and the other end of the second solenoid valve is an exhaust port; the remaining other ends of the two adsorption tanks are connected to each other and connected to one end of the third solenoid valve; the other end of the third solenoid valve is simultaneously connected to the air inlet of the vacuum pump and one end of the fourth solenoid valve through a pipeline, and the other end of the fourth solenoid valve is connected to the outlet end of the second adsorption tank through a pipeline; the absorption tank has two ports connected to the outside world, wherein the first port is connected to the air outlet of the vacuum pump, the second port is connected to one end of the fifth solenoid valve through a pipeline, and the other end of the fifth solenoid valve is connected to the oil return port of the oil storage tank.

[0014] Furthermore, the adsorption and desorption device includes a first adsorption and desorption device and a second adsorption and desorption device connected in parallel, wherein the first adsorption and desorption device and the second adsorption and desorption device are activated carbon adsorption and desorption devices or molecular sieve adsorption and desorption devices, and the adsorbents include but are not limited to activated carbon and molecular sieve.

[0015] Furthermore, the control system includes a pressure sensor, a concentration sensor, a liquid level meter, a control button, an input module, a microcontroller MCU, an output module, a frequency conversion module, a vacuum pump, several solenoid valves, a communication module, a host computer, a local display module and a storage module, and also includes control software, wherein the pressure sensor is installed at the air inlet of the device, the concentration sensor is installed at the exhaust port, and the liquid level meter is installed at the recovery tank.

[0016] The pressure sensor is used to monitor the intake pressure, the concentration sensor is used to monitor the gas concentration at the exhaust port, and the liquid level gauge is used to monitor the liquid level in the absorption tank. The input module is used to read the sensor signal and the status of the button. The microcontroller MCU is used to read the 4-20mA analog signal collected by the sensor and the digital signal of the control button through the input module, calculate and process these signals, and finally make a decision to control the status of the solenoid valve through the output module and the speed of the vacuum pump through the frequency conversion module, thereby realizing the standby, adsorption, desorption, gas replenishment and recovery of the device; after the microcontroller MCU processes and calculates the signal, it not only stores the processed data in the storage module, but also displays the data locally and sends it to the host computer through the communication module;

[0017] The above hardware structure and control software are configured as follows:

[0018] Standby module, adsorption module and desorption module, air supply module, recovery module and oil and gas concentration detection module,

[0019] The standby module includes a pressure sensor, a vacuum pump and a solenoid valve, and manages the vacuum pump to be in a stopped state and the solenoid valve to be in a closed state;

[0020] The adsorption module includes a concentration sensor, a vacuum pump, and a solenoid valve. The vacuum pump is kept in a low-speed rotation state, and the corresponding solenoid valve is in a state of matching the first adsorption tank and the second adsorption tank for adsorption. The desorption module includes a concentration sensor, a vacuum pump, and a solenoid valve. The vacuum pump is kept in a high-speed rotation state, and the corresponding solenoid valve is in a state of matching the first adsorption tank and the second adsorption tank for desorption, so that the oil and gas are separated and the oil flows back into the pipeline.

[0021] The air supply module includes a concentration sensor, a vacuum pump and a solenoid valve. The vacuum pump is in a stopped state, and the corresponding solenoid valve is in a matching air supply state, so that the adsorption tank is purged and flows through the pipeline to the absorption tank for absorption. After the absorption tank absorbs the oil and gas, it is fully integrated with the oil and then flows back to the oil storage tank through the oil return port.

[0022] The recovery module includes a liquid level meter and a solenoid valve to manage the liquid level of the absorption tank. When the liquid level in the absorption tank reaches a certain value, the fifth solenoid valve is opened, and when the liquid level is lower than a certain value, the fifth solenoid valve is closed;

[0023] The oil and gas concentration detection module includes an oil and gas concentration detector installed at the exhaust port. When the concentration at the exhaust port exceeds the emission standard, the adaptive oil and gas emission treatment device will automatically switch to the desorption process to prevent harmful oil and gas that does not meet the standard from being discharged into the air;

[0024] The present invention also provides an adaptive oil and gas emission control method for the adaptive oil and gas emission treatment device, which is characterized by comprising the following steps:

[0025] S1, read sensor signals and button status, and store the data locally and send it to the host computer and local display;

[0026] S2. When the air pressure at the air inlet is insufficient, the system is in standby mode, and the vacuum pump and all solenoid valves are closed;

[0027] S3, enter the adsorption process: If the emergency stop button and the stop button are not pressed, and the inlet pressure P≥P 启 , and the system does not alarm, the system enters the adsorption state and operates at a frequency f of 15-20% of the rated power of the vacuum pump. 低Drive the vacuum pump to accelerate the volatilized oil and gas in the oil storage tank to enter the adsorption tank for adsorption; if the emergency stop button and the stop button are pressed, or the intake pressure P<P 待 , or an alarm occurs, the system enters standby mode; 启 is the starting pressure of the system, P 待 is the standby pressure of the system;

[0028] S4, enter the desorption process: If the concentration of the exhaust port C≥C during the adsorption process 脱1 <C 标 , the system enters the desorption state and operates at the maximum frequency f 高 Drive the vacuum pump to vacuum the oil and gas adsorbed in the adsorption tank, desorb the oil and gas, and enter the recovery pipeline and finally enter the recovery tank; if during the adsorption process, the concentration of the exhaust port C<C 脱1 , then the adsorption state is maintained. 脱1 is the starting concentration of the desorption process, C 标 It is the emission concentration standard in the national standard, industry standard or local standard;

[0029] S5, enter the gas replenishment process: If the concentration of the exhaust port C<C during the desorption process 脱2 <C 脱1 , the system enters the gas replenishment state and maintains it for a certain period of time; otherwise, it continues to maintain the desorption state; where C 脱2 It is the concentration at which the system stops desorption and enters the gas replenishment state;

[0030] S6, enter the recovery process: After the gas filling process is completed, if the liquid level H≥H 上 , the system starts to recover oil and gas and opens the liquid return valve; if the liquid level H<H 下 , the system stops recovering oil and gas and closes the liquid return valve; 上 and H 下 They are the liquid levels for starting and closing the liquid return valve;

[0031] The above is a working cycle of the system. After the end, the system automatically repeats the cycle.

[0032] Furthermore, the following steps are included

[0033] S7, in steps S1-S6, as long as the concentration C≥C 标 , the system will be interrupted and enter the desorption process to ensure that substandard oil and gas will not be discharged into the atmosphere.

[0034] Furthermore, in step S3, the frequency conversion module is used to control the vacuum pump to operate at a frequency f of 20% of the rated power. 低 Drive the vacuum pump; in step S4, the frequency conversion module controls the vacuum pump to a frequency f of 100% of the rated power. 高Drive the vacuum pump.

[0035] The advantages of the present invention over the prior art are:

[0036] 1. The present invention has a simple structure and a convenient control method, which enables the vacuum pump to use different pumping speeds in the adsorption and desorption stages, thereby enhancing the absorption efficiency of the oil and gas recovery device. Specifically, in step S2, the frequency conversion module is used to control the vacuum pump to pump at a frequency f of 15-20% of the rated power. 低 Drive the vacuum pump. In step S3, the frequency conversion module controls the vacuum pump to operate at a frequency f of 100% of the rated power. 高 The vacuum pump is driven to increase the adsorption efficiency by 85%. In conventional devices, the adsorption phase takes up 90%-95% of the entire operating cycle, while in the device of the present invention, the adsorption phase takes up 30%-40% of the entire operating cycle.

[0037] 2. The two adsorption tanks are connected in multi-stage series to enhance the adsorption rate.

[0038] 3. The vacuum pump extracts air during the adsorption stage, making it easier for the oil and gas in the oil storage tank to flow into the adsorption tank for adsorption, and the oil and gas are not easily discharged from the exhaust port, thereby enhancing the absorption efficiency of the oil and gas recovery device.

[0039] 4. In view of the shortcomings of traditional devices of this type, it is proposed to time-share the vacuum pump, that is, to pump air at a lower speed during the adsorption stage to improve the adsorption efficiency, and to pump air at the maximum speed for desorption during the desorption stage; the former is to quickly extract the oil and gas volatilized from the oil storage tank through the pumping effect of the vacuum pump, and enter the adsorption tank through the pipeline for full adsorption; in the latter, the oil and gas are in full contact with the adsorbent in the adsorption tank and are adsorbed on the adsorbent. The strong pumping effect of the vacuum pump is required to make the oil adsorbed on the adsorbent separate from the adsorbent, enter the pipeline, and finally enter the recovery tank; this can make full use of hardware resources and save a lot of hardware costs to achieve the same oil and gas recovery effect. In other words, if this method is not used and the same oil and gas recovery effect is to be achieved, hardware must be increased, which increases costs; that is, make full use of the vacuum pump to improve the efficiency of adsorption and desorption.

[0040] 5. During the system's working cycle, the system always relies on the data collected by the sensors and the button status to adaptively start each work process.

[0041] 6. According to the inlet pressure, adjust the vacuum pump to work at a lower speed to improve the adsorption efficiency; according to the exhaust port concentration, adjust the vacuum pump to work at a higher speed to improve the desorption efficiency; at the same time, at any stage of the entire working cycle, as long as the exhaust concentration exceeds the standard, desorption will be carried out at the maximum speed to ensure that the gas discharged through the exhaust port is harmless.

[0042] In summary, the present device has a simple structure and is easy to control. The multi-stage series structure of the adsorption tanks can effectively enhance the adsorption efficiency of oil and gas, and the parallel desorption structure of the adsorption tanks can maximize the desorption efficiency, with the adsorption efficiency increased by 85%. The time-sharing reuse of the vacuum pump not only does not reduce the adsorption capacity of the adsorption device during the adsorption phase, but also effectively reduces the adsorption time by 80%. Efficient desorption can also be performed during the desorption phase, making full use of the vacuum pump resources. Typically, with traditional devices, the adsorption phase accounts for 90%-95% of the entire operating cycle. The adsorption phase of the device of the present invention accounts for 30-40% of the entire operating cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0044] Figure 2 This is a flow diagram of oil and gas in the device during the adsorption process of the present invention;

[0045] Figure 3 This is a flow diagram of oil and gas in the device during the desorption process of the present invention;

[0046] Figure 4 This is a flow diagram of oil and gas in the device during the gas replenishment process of the present invention;

[0047] Figure 5 It is a control principle block diagram of the present invention;

[0048] Figure 6 It is a control flow chart of the present invention.

[0049] Among them: 1-air inlet, 11-first adsorption tank, 12-second adsorption tank, 21-first solenoid valve, 22-second solenoid valve, 23-third solenoid valve, 24-fourth solenoid valve, 25-fifth solenoid valve, 3-vacuum pump, 4-absorption tank, 5-oil storage tank, 6-pipeline, 7-exhaust port. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are generally within the scope of protection of the present invention.

[0051] Example 1

[0052] like Figure 1 As shown, the adaptive oil and gas emission treatment device based on the time-sharing multiplexing control algorithm of the present invention includes a plurality of oil and gas adsorption tanks, a plurality of solenoid valves, a vacuum pump, an absorption tank, an oil storage tank, and a pipeline;

[0053] The plurality of oil and gas adsorption tanks are first connected in series, and one end of the plurality of oil and gas adsorption tanks are connected in parallel;

[0054] One end of the first of the plurality of oil and gas adsorption tanks is an air inlet, which is communicated with the oil storage tank; the other end of the last of the plurality of oil and gas adsorption tanks is an exhaust port;

[0055] The solenoid valves are installed on the pipelines between the oil storage tank, the oil and gas adsorption tank, the vacuum pump and the absorption tank respectively, and the pipelines are opened and closed according to the working requirements;

[0056] The vacuum pump is installed between the absorption tank and the parallel ends of several oil and gas absorption tanks;

[0057] The absorption tank is connected to the oil storage tank through a pipeline;

[0058] The system also includes a control system, which controls the opening of a vacuum pump and a plurality of electromagnetic valves to complete an adaptive oil and gas emission processing process based on a time-sharing multiplexing control algorithm.

[0059] The plurality of oil and gas adsorption tanks are two first adsorption tanks and a second adsorption tank, which are connected in series and then connected in parallel at one end.

[0060] There are five solenoid valves, namely, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a fifth solenoid valve; the first adsorption tank and the second adsorption tank are installed and connected in series through a pipeline; the front end of the first adsorption tank is connected to the first solenoid valve through a pipeline, the front end of the first solenoid valve is an air inlet, and the air inlet is connected to the oil storage tank, the outlet end of the second adsorption tank is connected to one end of the second solenoid valve through a pipeline, and the other end of the second solenoid valve is an exhaust port; the remaining other ends of the two adsorption tanks are connected to each other and connected to one end of the third solenoid valve; the other end of the third solenoid valve is simultaneously connected to the air inlet of the vacuum pump and one end of the fourth solenoid valve through a pipeline, and the other end of the fourth solenoid valve is connected to the outlet end of the second adsorption tank through a pipeline; the absorption tank has two ports connected to the outside world, of which the first port is connected to the air outlet of the vacuum pump, the second port is connected to one end of the fifth solenoid valve through a pipeline, and the other end of the fifth solenoid valve is connected to the oil return port of the oil storage tank.

[0061] The adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device connected in parallel, wherein the first adsorption and desorption device and the second adsorption and desorption device are both activated carbon adsorption and desorption devices or molecular sieve adsorption and desorption devices.

[0062] Example 2

[0063] like Figure 1As shown, the adaptive oil and gas emission treatment device based on the time-sharing multiplexing control algorithm of the present invention is as follows: Figure 1 As shown, the adaptive oil and gas emission treatment device based on the time-sharing multiplexing control algorithm of the present invention includes a plurality of oil and gas adsorption tanks, a plurality of solenoid valves, a vacuum pump, an absorption tank, an oil storage tank, and a pipeline;

[0064] The plurality of oil and gas adsorption tanks are first connected in series, and one end of the plurality of oil and gas adsorption tanks are connected in parallel;

[0065] One end of the first of the plurality of oil and gas adsorption tanks is an air inlet, which is communicated with the oil storage tank; the other end of the last of the plurality of oil and gas adsorption tanks is an exhaust port;

[0066] The solenoid valves are installed on the pipelines between the oil storage tank, the oil and gas adsorption tank, the vacuum pump and the absorption tank respectively, and the pipelines are opened and closed according to the working requirements;

[0067] The vacuum pump is installed between the absorption tank and the parallel ends of several oil and gas absorption tanks;

[0068] The absorption tank is connected to the oil storage tank through a pipeline;

[0069] The system also includes a control system, which controls the opening of a vacuum pump and a plurality of electromagnetic valves to complete an adaptive oil and gas emission processing process based on a time-sharing multiplexing control algorithm.

[0070] The plurality of oil and gas adsorption tanks are two first adsorption tanks and a second adsorption tank, which are connected in series and then connected in parallel at one end.

[0071] There are five solenoid valves, namely, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a fifth solenoid valve; the first adsorption tank and the second adsorption tank are installed and connected in series through a pipeline; the front end of the first adsorption tank is connected to the first solenoid valve through a pipeline, the front end of the first solenoid valve is an air inlet, and the air inlet is connected to the oil storage tank, the outlet end of the second adsorption tank is connected to one end of the second solenoid valve through a pipeline, and the other end of the second solenoid valve is an exhaust port; the remaining other ends of the two adsorption tanks are connected to each other and connected to one end of the third solenoid valve; the other end of the third solenoid valve is simultaneously connected to the air inlet of the vacuum pump and one end of the fourth solenoid valve through a pipeline, and the other end of the fourth solenoid valve is connected to the outlet end of the second adsorption tank through a pipeline; the absorption tank has two ports connected to the outside world, of which the first port is connected to the air outlet of the vacuum pump, the second port is connected to one end of the fifth solenoid valve through a pipeline, and the other end of the fifth solenoid valve is connected to the oil return port of the oil storage tank.

[0072] The adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device connected in parallel, wherein the first adsorption and desorption device and the second adsorption and desorption device are both activated carbon adsorption and desorption devices or molecular sieve adsorption and desorption devices.

[0073] The control system includes a pressure sensor, a concentration sensor, a liquid level meter, a control button, an input module, a microcontroller MCU, an output module, a frequency conversion module, a vacuum pump, several solenoid valves, a communication module, a host computer, a local display module and a storage module, and also includes control software, wherein the pressure sensor is installed at the air inlet of the device, the concentration sensor is installed at the exhaust port, and the liquid level meter is installed at the recovery tank.

[0074] The pressure sensor is used to monitor the intake pressure, the concentration sensor is used to monitor the gas concentration at the exhaust port, and the liquid level gauge is used to monitor the liquid level in the absorption tank. The input module is used to read the sensor signal and the status of the button. The microcontroller MCU is used to read the 4-20mA analog signal collected by the sensor and the digital signal of the control button through the input module, calculate and process these signals, and finally make a decision to control the status of the solenoid valve through the output module and the speed of the vacuum pump through the frequency conversion module, thereby realizing the standby, adsorption, desorption, gas replenishment and recovery of the device; after the microcontroller MCU processes and calculates the signal, it not only stores the processed data in the storage module, but also displays the data locally and sends it to the host computer through the communication module;

[0075] Specifically, analog signals are converted to digital quantities via the analog-to-digital converter (ADC) in the microcontroller (MCU). This digital quantity is then linearly compared to the sensor's range, ultimately calculating the actual physical quantities, including intake pressure and exhaust concentration. For digital signals, the system is started, stopped, or emergency-stopped based on the high or low levels (1 or 0) read from each button. The specific process for making decisions and controlling the state of the solenoid valve through the output module is as follows: Based on the intake pressure and exhaust concentration values ​​and liquid level detected by the sensor, the system determines which step of the workflow to execute. Workflows include standby, adsorption, desorption, gas replenishment, or recovery. The solenoid valve's state (open or closed) is then changed according to the workflow.

[0076] The above hardware structure and control software are configured as follows:

[0077] Standby module, adsorption module and desorption module, air supply module, recovery module and oil and gas concentration detection module,

[0078] The standby module includes a pressure sensor, a vacuum pump and a solenoid valve, and manages the vacuum pump to be in a stopped state and the first to fifth solenoid valves to be in a closed state;

[0079] The adsorption module includes a concentration sensor, a vacuum pump, a first solenoid valve and a second solenoid valve, and manages the vacuum pump to be in a low-speed rotation state, and the corresponding solenoid valve is in a state of matching the first adsorption tank and the second adsorption tank for adsorption;

[0080] The desorption module includes a concentration sensor, a vacuum pump, a third solenoid valve, and a fourth solenoid valve. The vacuum pump is kept in a high-speed rotation state, and the corresponding solenoid valves are in a state of matching the first adsorption tank and the second adsorption tank for desorption, so that the oil and gas are separated and the oil returns to the pipeline;

[0081] The air supply module includes a concentration sensor, a vacuum pump and a fifth solenoid valve. The vacuum pump is in a stopped state, and the corresponding solenoid valve is in a matching air supply state, so that the absorption tank is purged and flows through the pipeline to the absorption tank for absorption. After the absorption tank absorbs the oil and gas, it is fully integrated with the oil and then flows back to the oil storage tank through the oil return port.

[0082] The recovery module includes a liquid level meter and a solenoid valve to manage the liquid level of the absorption tank. When the liquid level in the absorption tank reaches a certain value, the fifth solenoid valve is opened, and when the liquid level is lower than a certain value, the fifth solenoid valve is closed;

[0083] The oil and gas concentration detection module includes an oil and gas concentration detector, which is installed at the exhaust port. When the concentration at the exhaust port exceeds the emission standard, the adaptive oil and gas emission treatment device will automatically switch to the desorption process to prevent substandard harmful oil and gas from being discharged into the air.

[0084] Example 3

[0085] like Figure 5 Shown is a control principle block diagram of the present invention, Figure 6 As shown in the control flow chart of the present invention, the control method of the adaptive oil and gas emission treatment device based on the time-sharing multiplexing control algorithm of the present invention includes the following steps:

[0086] S1, read sensor signals and button status, and store the data locally and send it to the host computer and local display;

[0087] S2. When the air pressure at the air inlet is insufficient, the system is in standby mode, and the vacuum pump and all solenoid valves are closed;

[0088] S3, enter the adsorption process: If the emergency stop button and the stop button are not pressed, and the inlet pressure P≥P 启 , and the system does not alarm, the system enters the adsorption state, the first solenoid valve, the second solenoid valve, and the fourth solenoid valve are opened, and the frequency f is 15-20% of the rated power of the vacuum pump. 低 Drive the vacuum pump to accelerate the volatilized oil and gas in the oil storage tank to enter the adsorption tank for adsorption; if the emergency stop button and the stop button are pressed, or the intake pressure P<P待 , or an alarm occurs, the system enters standby mode; 启 is the starting pressure of the system, P 待 is the standby pressure of the system;

[0089] S4, enter the desorption process: If the concentration of the exhaust port C≥Cde1<Cstandard during the adsorption process, the system enters the desorption state, closes the first solenoid valve, the second solenoid valve, and the fourth solenoid valve, opens the third solenoid valve, and 高 Drive the vacuum pump to vacuum the oil and gas adsorbed in the adsorption tank, desorb the oil and gas, and enter the recovery pipeline and finally enter the recovery tank; if during the adsorption process, the concentration of the exhaust port C<C 脱1 , then the adsorption state is maintained. 脱1 is the starting concentration of the desorption process, C 标 It is the emission concentration standard in the national standard, industry standard or local standard;

[0090] S5, enter the gas replenishment process: If the concentration of the exhaust port C<C during the desorption process 脱2 <C 脱1 , the system enters the air supply state, opens the first solenoid valve and the second solenoid valve, closes the vacuum pump and the third solenoid valve, and maintains this state for a certain period of time; otherwise, it continues to maintain the desorption state; where C 脱2 This is the concentration at which the system stops desorption and enters the air replenishment state. In the air replenishment state, air is allowed to purge the absorption tank, sweeping the remaining oil and gas into the pipeline, and then flowing through the pipeline to the absorption tank for absorption. After the absorption tank absorbs the oil and gas, it flows back to the oil storage tank through the oil return port.

[0091] S6, enter the recovery process: After the gas filling process is completed, if the liquid level H≥H 上 , the system starts to recover oil and gas, and opens the fifth solenoid valve; if the liquid level H<H 下 , the system stops recovering oil and gas and closes the fifth solenoid valve; 上 and H 下 They are the liquid levels for starting and closing the fifth solenoid valve;

[0092] The above is a working cycle of the system. After the end, the system automatically repeats the cycle.

[0093] It also includes the following steps

[0094] S7, in steps S1-S6, as long as the concentration C≥C 标 , the system will be interrupted and enter the desorption process to ensure that substandard oil and gas will not be discharged into the atmosphere.

[0095] In step S3, the frequency f is 20% of the rated power of the vacuum pump. 低Drive the vacuum pump; in step S4, the frequency f is 100% of the rated power of the vacuum pump. 高 Drive the vacuum pump.

Claims

1. An adaptive oil and gas emission control method based on a time-sharing multiplexing control algorithm, using an adaptive oil and gas emission treatment device based on a time-sharing multiplexing control algorithm, the adaptive oil and gas emission treatment device comprising a plurality of oil and gas adsorption tanks, a plurality of solenoid valves, a vacuum pump, an absorption tank, an oil storage tank, and a pipeline; in, The plurality of oil and gas adsorption tanks are first connected in series, and one end of the plurality of oil and gas adsorption tanks are connected in parallel; One end of the first of the plurality of oil and gas adsorption tanks is an air inlet, which is communicated with the oil storage tank; the other end of the last of the plurality of oil and gas adsorption tanks is an exhaust port; The solenoid valves are installed on the pipelines between the oil storage tank, the oil and gas adsorption tank, the vacuum pump and the absorption tank respectively, and the pipelines are opened and closed according to the working requirements; The vacuum pump is installed between the absorption tank and the parallel ends of several oil and gas absorption tanks; The absorption tank is connected to the oil storage tank through a pipeline; It also includes a control system, which controls the speed of the vacuum pump and the opening of several solenoid valves to complete the adaptive oil and gas emission processing process based on the time-sharing multiplexing control algorithm; The method is characterized by comprising the following steps: S1, read sensor signals and button status, and store the data locally and send it to the host computer and local display; S2. When the air pressure at the air inlet is insufficient, the system is in standby mode, and the vacuum pump and all solenoid valves are closed; S3, enter the adsorption process: If the emergency stop button and the stop button are not pressed, and the inlet pressure P≥P 启 , and the system does not alarm, the system enters the adsorption state and operates at a frequency f of 15-20% of the rated power of the vacuum pump. 低 Drive the vacuum pump to accelerate the volatilized oil and gas in the oil storage tank to enter the adsorption tank for adsorption; if the emergency stop button and the stop button are pressed, or the intake pressure P<P 待 , or an alarm occurs, the system enters standby mode; 启 is the starting pressure of the system, P 待 is the standby pressure of the system; S4, enter the desorption process: If the concentration of the exhaust port C≥C during the adsorption process 脱1 <C 标 , the system enters the desorption state and operates at the maximum frequency f 高 Drive the vacuum pump to vacuum the oil and gas adsorbed in the adsorption tank, desorb the oil and gas, and enter the recovery pipeline and finally enter the recovery tank; if during the adsorption process, the concentration of the exhaust port C<C 脱1 , then the adsorption state is maintained; among which C 脱1 is the starting concentration of the desorption process, C 标 It is the emission concentration standard in the national standard, industry standard or local standard; S5, enter the gas replenishment process: If the concentration of the exhaust port C<C during the desorption process 脱2 <C 脱1 , the system enters the gas replenishment state and maintains it for a certain period of time; otherwise, it continues to maintain the desorption state; where C 脱2 It is the concentration at which the system stops desorption and enters the gas replenishment state; S6, enter the recovery process: After the gas filling process is completed, if the liquid level H≥H 上 , the system starts to recover oil and gas and opens the liquid return valve; if the liquid level H<H 下 , the system stops recovering oil and gas and closes the liquid return valve; 上 and H 下 They are the liquid levels for starting and closing the liquid return valve; The above is a working cycle of the system. After the end, the system automatically repeats the cycle.

2. The control method according to claim 1, wherein: The plurality of oil and gas adsorption tanks are two first adsorption tanks and a second adsorption tank, which are connected in series and then connected in parallel at one end.

3. The control method according to claim 2, wherein: There are five solenoid valves, namely, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a fifth solenoid valve; the first adsorption tank and the second adsorption tank are installed and connected in series through a pipeline; the front end of the first adsorption tank is connected to the first solenoid valve through a pipeline, the front end of the first solenoid valve is an air inlet, and the air inlet is connected to the oil storage tank, the outlet end of the second adsorption tank is connected to one end of the second solenoid valve through a pipeline, and the other end of the second solenoid valve is an exhaust port; the remaining other ends of the two adsorption tanks are connected to each other and connected to one end of the third solenoid valve; the other end of the third solenoid valve is simultaneously connected to the air inlet of the vacuum pump and one end of the fourth solenoid valve through a pipeline, and the other end of the fourth solenoid valve is connected to the outlet end of the second adsorption tank through a pipeline; the absorption tank has two ports connected to the outside world, of which the first port is connected to the air outlet of the vacuum pump, the second port is connected to one end of the fifth solenoid valve through a pipeline, and the other end of the fifth solenoid valve is connected to the oil return port of the oil storage tank.

4. The control method according to any one of claims 1 to 3, characterized in that: The control system includes a pressure sensor, a concentration sensor, a liquid level meter, a control button, an input module, a microcontroller MCU, an output module, a frequency conversion module, a vacuum pump, several solenoid valves, a communication module, a host computer, a local display module and a storage module, and also includes control software, wherein the pressure sensor is installed at the air inlet of the device, the concentration sensor is installed at the exhaust port, and the liquid level meter is installed at the recovery tank. The pressure sensor is used to monitor the intake pressure, the concentration sensor is used to monitor the gas concentration at the exhaust port, the liquid level gauge is used to monitor the liquid level in the absorption tank, the input module is used to read the sensor signal and the status of the button, and the microcontroller MCU is used to read the 4-20mA analog signal collected by the sensor and the digital signal of the control button through the input module, calculate and process these signals, and finally make a decision to control the status of the solenoid valve through the output module and the speed of the vacuum pump through the frequency conversion module, thereby realizing the standby, adsorption, desorption, gas replenishment and recovery of the device; after the microcontroller MCU processes and calculates the signal, it not only stores the processed data in the storage module, but also displays the data locally and sends it to the host computer through the communication module; The control system is configured as follows: Standby module, adsorption module and desorption module, air supply module, recovery module and oil and gas concentration detection module, The standby module includes a pressure sensor, a vacuum pump and a solenoid valve, and manages the vacuum pump to be in a stopped state and the first to fifth solenoid valves to be in a closed state; The adsorption module includes a concentration sensor, a vacuum pump, a first solenoid valve and a second solenoid valve, and manages the vacuum pump to be in a low-speed rotation state, and the corresponding solenoid valve is in a state of matching the first adsorption tank and the second adsorption tank for adsorption; The desorption module includes a concentration sensor, a vacuum pump, a third solenoid valve, and a fourth solenoid valve. The vacuum pump is kept in a high-speed rotation state, and the corresponding solenoid valves are in a state of matching the first adsorption tank and the second adsorption tank for desorption, so that the oil and gas are separated and the oil returns to the pipeline; The air supply module includes a concentration sensor, a vacuum pump and a fifth solenoid valve. The vacuum pump is in a stopped state, and the corresponding solenoid valve is in a matching air supply state, so that the absorption tank is purged and flows through the pipeline to the absorption tank for absorption. After the absorption tank absorbs the oil and gas, it is fully integrated with the oil and then flows back to the oil storage tank through the oil return port. The recovery module includes a liquid level meter and a solenoid valve to manage the liquid level of the absorption tank. When the liquid level in the absorption tank reaches a certain value, the fifth solenoid valve is opened, and when the liquid level is lower than a certain value, the fifth solenoid valve is closed; The oil and gas concentration detection module includes an oil and gas concentration detector, which is installed at the exhaust port. When the concentration at the exhaust port exceeds the emission standard, the adaptive oil and gas emission treatment device will automatically switch to the desorption process to prevent substandard harmful oil and gas from being discharged into the air.

5. The control method according to any one of claims 1 to 3, characterized in that: In step S3, the frequency conversion module is used to control the vacuum pump to operate at a frequency f of 15-20% of the rated power. 低 Drive the vacuum pump; in step S4, the frequency conversion module controls the vacuum pump to a frequency f of 100% of the rated power. 高 Drive the vacuum pump.

6. The control method according to claim 4, characterized in that: In step S3, the frequency conversion module is used to control the vacuum pump to operate at a frequency f of 15-20% of the rated power. 低 Drive the vacuum pump; in step S4, the frequency conversion module controls the vacuum pump to a frequency f of 100% of the rated power. 高 Drive the vacuum pump.

7. The control method according to any one of claims 1 to 3, characterized in that The following steps are also included: S7, in steps S1-S6, as long as the concentration C≥C 标 , the system will be interrupted and enter the desorption process to ensure that substandard oil and gas will not be discharged into the atmosphere.

8. The control method according to claim 4, characterized in that The following steps are also included: S7, in steps S1-S6, as long as the concentration C≥C 标 , the system will be interrupted and enter the desorption process to ensure that substandard oil and gas will not be discharged into the atmosphere.

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