阅读说明：本技术 基于分时复用控制算法的自适应油气排放处理装置及控制方法 (Self-adaptive oil gas emission treatment device based on time-sharing multiplexing control algorithm and control method ) 是由 蓝桂平 丁冬兵 杜武 邹云 肖天成 郑飞 周东来 于 2021-06-10 设计创作，主要内容包括：本发明涉及一种基于分时复用控制算法的自适应油气排放处理装置。包括若干个(填充了吸附物质的)油气吸附罐,若干电磁阀,真空泵,吸收罐(填充了一部分汽油),储油罐,以及管道。所述若干个油气吸附罐先进行串联(串联状态用于吸附油气过程),并且若干个油气吸附罐的一端进行并联(并联状态用于脱附油气过程)。本装置的结构简单,控制方便,吸附罐的多级串联结构能够有效的增强油气的吸附效率,吸附罐的并联脱附结构能够最大化的提高脱附效率,吸附效率提升了85％。真空泵的分时复用,在吸附阶段不但未降低吸附装置的吸附能力,而且有效减少了80％吸附时间,在脱附阶段也可进行高效的脱附,充分利用了真空泵资源。本发明的装置吸附阶段的时间仅占整个运行周期的30-40％。(The invention relates to a self-adaptive oil gas emission treatment device based on a time-sharing multiplexing control algorithm. The device comprises a plurality of oil gas adsorption tanks (filled with adsorption substances), a plurality of electromagnetic valves, a vacuum pump, an absorption tank (filled with a part of gasoline), an oil storage tank and pipelines. The oil gas adsorption tanks are connected in series (the series state is used for the oil gas adsorption process), and one ends of the oil gas adsorption tanks are connected in parallel (the parallel state is used for the oil gas desorption process). The device has the advantages of simple structure, convenient control, effective adsorption efficiency enhancement of the oil gas due to the multistage series connection structure of the adsorption tanks, maximized desorption efficiency enhancement of the parallel desorption structure of the adsorption tanks, and 85% improvement of the adsorption efficiency. The time-sharing multiplexing of the vacuum pump not only does not reduce the adsorption capacity of the adsorption device in the adsorption stage, but also effectively reduces 80 percent of adsorption time, and efficient desorption can be carried out in the desorption stage, thereby fully utilizing the vacuum pump resources. The adsorption phase of the apparatus of the present invention takes only 30-40% of the total operating cycle.)

1. The self-adaptive oil gas emission treatment device based on the time-sharing multiplexing control algorithm is characterized by comprising a plurality of oil gas adsorption tanks, a plurality of electromagnetic valves, a vacuum pump, an absorption tank, an oil storage tank and a pipeline;

the oil gas adsorption tanks are connected in series, and one ends of the oil gas adsorption tanks are connected in parallel;

one end of the first oil gas adsorption tank in the oil gas adsorption tanks is provided with an air inlet which is communicated with the oil storage tank; the other end of the last oil gas adsorption tank in the oil gas adsorption tanks is an exhaust port;

the electromagnetic valves are respectively arranged on pipelines among the oil storage tank, the oil gas adsorption tank, the vacuum pump and the absorption tank, and the opening and closing states of the pipelines are realized according to working requirements;

the vacuum pump is arranged between the absorption tank and the parallel ends of the oil gas adsorption tanks;

the absorption tank is communicated with the oil storage tank through a pipeline;

the system also comprises a control system, wherein the control system controls the rotating speed of the vacuum pump and the opening of the plurality of electromagnetic valves to complete the self-adaptive oil-gas emission treatment process based on the time-sharing multiplexing control algorithm.

2. The adaptive hydrocarbon emission treatment device of claim 1, wherein: the oil gas adsorption tanks are two first adsorption tanks and two second adsorption tanks, and one ends of the oil gas adsorption tanks are connected in parallel after being connected in series.

3. The adaptive hydrocarbon emission treatment device of claim 2, wherein: the number of the electromagnetic valves is five, and the electromagnetic valves comprise a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic 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 with a first electromagnetic valve through a pipeline, the front end of the first electromagnetic valve is an air inlet which is communicated with the oil storage tank, the outlet end of the second adsorption tank is connected with one end of a second electromagnetic valve through a pipeline, and the other end of the second electromagnetic valve is an air outlet; the other ends of the two adsorption tanks are connected with each other and connected with one end of a third electromagnetic valve; the other end of the third electromagnetic valve is simultaneously connected to an air inlet of the vacuum pump and one end of a fourth electromagnetic valve through a pipeline, and the other end of the fourth electromagnetic valve is connected with the outlet end of the second adsorption tank through a pipeline; the absorption tank is connected with the outside and is provided with two ports, wherein the first port is connected with the air outlet of the vacuum pump, the second port is connected with one end of the fifth electromagnetic valve through a pipeline, and the other end of the fifth electromagnetic valve is connected with the oil return port of the oil storage tank.

4. The adaptive hydrocarbon emission treatment device of claim 3, wherein: the adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device which are connected in parallel, 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 adsorption substances include but are not limited to activated carbon and molecular sieves.

5. The adaptive hydrocarbon emission treatment device of claim 4, wherein: the control system comprises 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, a plurality of electromagnetic valves, a communication module, an upper computer, a local display module and a storage module, and also comprises control software, wherein the pressure sensor is arranged at an air inlet of the device, the concentration sensor is arranged at an air outlet, the liquid level meter is arranged at a recovery tank,

the pressure sensor is used for monitoring the air inlet pressure, the concentration sensor is used for monitoring the gas concentration of the air outlet, the liquid level meter is used for monitoring the liquid level in the absorption tank, the input module is used for reading the sensor signal and the state of the button, the microcontroller MCU is used for reading the 4-20mA analog signal and the digital signal of the control button which are collected by the sensor through the input module, and after the signals are calculated and processed, the decision is finally made, the state of the electromagnetic valve is controlled through the output module, the rotating speed of the vacuum pump is controlled through the frequency conversion module, and then the standby, the adsorption, the desorption, the air supplement and the recovery of the device are realized; after the microcontroller MCU processes and calculates the signals, the processed data is stored in the storage module, and is locally displayed and sent to the upper computer through the communication module;

the hardware structure and the control software are configured to:

a standby module, an adsorption module, a desorption module, a gas supplementing module, a recovery module and an oil gas concentration detection module,

the standby module comprises a pressure sensor, a vacuum pump and an electromagnetic valve, the vacuum pump is managed to be in a stop state, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the fourth electromagnetic valve are in a closed state;

the adsorption module comprises a concentration sensor, a vacuum pump, a first electromagnetic valve and a second electromagnetic valve, the vacuum pump is managed to be in a low-speed rotation state, and the corresponding electromagnetic valves are in a state of being matched with the first adsorption tank and the second adsorption tank for adsorption;

the desorption module comprises a concentration sensor, a vacuum pump, a third electromagnetic valve and a fourth electromagnetic valve, the vacuum pump is managed to be in a high-speed rotation state, the corresponding electromagnetic valves are in a state of being matched with the first adsorption tank and the second adsorption tank for desorption, so that oil and gas are separated, and oil flows back to enter a pipeline;

the gas supplementing module comprises a concentration sensor, a vacuum pump and a fifth electromagnetic valve, the vacuum pump is managed to be in a stop state, the corresponding electromagnetic valve is in a matched gas supplementing state, the absorption tank is enabled to be blown and flows to the absorption tank through a pipeline for absorption, the absorption tank is fully fused with oil after absorbing oil gas, and the oil gas flows back to the oil storage tank through the oil return port again;

the recovery module comprises a liquid level meter and an electromagnetic valve, manages the liquid level of the absorption tank, opens the fifth electromagnetic valve when the liquid level in the absorption tank reaches a certain value, and closes the fifth electromagnetic valve when the liquid level is lower than the certain value;

the oil gas concentration detection module comprises an oil gas concentration detector and is arranged at the exhaust port, and when the concentration of the exhaust port exceeds the emission standard, the self-adaptive oil gas emission processing device automatically switches to a desorption process to prevent unqualified harmful oil gas from being discharged into the air.

6. The adaptive hydrocarbon emission treatment control method of the adaptive hydrocarbon emission treatment device according to any one of claims 1 to 5, characterized by comprising the steps of:

s1, reading the sensor signal and the state of the button, and locally storing and sending the data to an upper computer and locally displaying;

s2, when the air pressure of the air inlet is insufficient, the system is in a standby state, and the vacuum pump and all the electromagnetic valves are in a closed state;

s3, entering an adsorption flow: if the emergency stop button and the stop button are not pressed, and the intake pressure P is more than or equal to P_OpenerAnd the system is not alarmed, the system enters an adsorption state and the frequency f is 15-20% of the rated power of the vacuum pump_{Is low in}Driving a vacuum pump to accelerate the volatile oil gas in the oil storage tank to quickly enter the adsorption tank for adsorption; if the emergency stop button and the stop button are pressed, or the intake pressure P is less than P_{To be treated}Or when an alarm occurs, the system enters a standby state; wherein P is_OpenerIs the starting pressure of the system, P_{To be treated}Is the standby pressure of the system;

s4, entering a desorption process: if the concentration C of the exhaust port is more than or equal to C in the adsorption process_{Removing 1}＜C_{Sign board}The system enters the desorption state and the maximum frequency f_{Height of}Driving a vacuum pump, vacuumizing the oil gas adsorbed in the adsorption tank, desorbing the oil gas, feeding the oil gas into a recovery pipeline, and finally feeding the oil gas into a recovery tank; if the concentration C of the exhaust port is less than C in the adsorption process_{Removing 1}The adsorption state is maintained. Wherein C is_{Removing 1}Is the starting concentration of the desorption process, C_{Sign board}Is the standard of emission concentration in national standard or row standard or landmark;

s5, entering a qi tonifying process: if the concentration C of the exhaust port is less than C in the desorption process_{Doff 2}＜C_{Removing 1}The system enters a gas supplementing state and is kept for a certain time; otherwise, continuously keeping the desorption state; wherein C is_{Doff 2}The system stops desorption and enters the concentration of a gas supplementing state;

s6, entering a recovery flow: after the air supply process is finished, if the liquid level H is more than or equal to H_{On the upper part}The system starts to recover oil gas and opens the liquid return valve; if the liquid level H is less than H_{Lower part}The system stops recovering oil gas and closes the liquid return valve; wherein H_{On the upper part}And H_{Lower part}The liquid level of the liquid return valve is started and closed respectively;

the above is a working period of the system, and after the system finishes the working period, the system automatically reciprocates to carry out the working period.

7. The adaptive hydrocarbon emission treatment control method of the adaptive hydrocarbon emission treatment device of claim 6, further comprising the step of

S7, steps S1-S6, provided that the concentration C of the exhaust port is not less than C_{Sign board}And the system is interrupted and enters a desorption process to ensure that the oil gas which does not reach the standard cannot be discharged into the atmosphere.

8. The adaptive hydrocarbon discharge treatment control method of the adaptive hydrocarbon discharge treatment device according to claim 6, wherein in step S3, the vacuum pump is controlled by the frequency conversion module to have a frequency f of 15-20% of the rated power_{Is low in}Driving a vacuum pump; in step S4, the frequency conversion module controls the vacuum pump to have the frequency f of 100% of the rated power_{Height of}The vacuum pump is driven.

Technical Field

The invention relates to the technical field of oil gas recovery and treatment, in particular to a self-adaptive oil gas discharge treatment device and a control method based on a time-sharing multiplexing control algorithm.

Background

The oil gas recovery is a new energy-saving and environment-friendly technology, the oil gas discharged in the processes of storage, transportation, loading and unloading of oil products is recovered by using the oil gas recovery technology, the atmospheric pollution caused by volatilization of the oil gas is prevented, the potential safety hazard is eliminated, and the loss and the benefit are reduced by improving the utilization rate of energy sources, so that higher benefit is obtained. The most common methods at present are condensation method, adsorption method and mixed adsorption method combining the above methods. However, any of the above methods has the disadvantages of low absorption rate and long adsorption process time.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a treatment device and a control method which can absorb oil and gas to the maximum extent.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the self-adaptive oil gas emission treatment device based on the time-sharing multiplexing control algorithm is characterized by comprising a plurality of oil gas adsorption tanks (filled with adsorption substances), a plurality of electromagnetic valves, a vacuum pump, an absorption tank, an oil storage tank and pipelines;

the oil gas adsorption tanks are connected in series (in a series state for oil gas adsorption process), and one ends of the oil gas adsorption tanks are connected in parallel (in a parallel state for oil gas desorption process);

one end of the first oil gas adsorption tank in the oil gas adsorption tanks is provided with an air inlet which is communicated with the oil storage tank; the other end of the last oil gas adsorption tank in the oil gas adsorption tanks is an exhaust port;

the electromagnetic valves are respectively arranged on pipelines among the oil storage tank, the oil gas adsorption tank, the vacuum pump and the absorption tank, and the opening and closing states of the pipelines are realized according to working requirements;

the vacuum pump is arranged between the absorption tank and the parallel ends of the oil gas adsorption tanks;

the absorption tank is communicated with the oil storage tank through a pipeline;

the system also comprises a control system, wherein the control system controls the rotating speed of the vacuum pump and the opening of the plurality of electromagnetic valves to complete the self-adaptive oil-gas emission treatment process based on the time-sharing multiplexing control algorithm.

Furthermore, the oil gas adsorption tanks are two first adsorption tanks and two second adsorption tanks, and after the oil gas adsorption tanks are connected in series, one ends of the oil gas adsorption tanks are connected in parallel.

Furthermore, the number of the electromagnetic valves is five, and the electromagnetic valves comprise a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic 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 with a first electromagnetic valve through a pipeline, the front end of the first electromagnetic valve is an air inlet which is communicated with the oil storage tank, the outlet end of the second adsorption tank is connected with one end of a second electromagnetic valve through a pipeline, and the other end of the second electromagnetic valve is an air outlet; the other ends of the two adsorption tanks are connected with each other and connected with one end of a third electromagnetic valve; the other end of the third electromagnetic valve is simultaneously connected to an air inlet of the vacuum pump and one end of a fourth electromagnetic valve through a pipeline, and the other end of the fourth electromagnetic valve is connected with the outlet end of the second adsorption tank through a pipeline; the absorption tank is connected with the outside and is provided with two ports, wherein the first port is connected with the air outlet of the vacuum pump, the second port is connected with one end of the fifth electromagnetic valve through a pipeline, and the other end of the fifth electromagnetic valve is connected with the oil return port of the oil storage tank.

Further, the adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device which are connected in parallel, 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 adsorption substances include but are not limited to activated carbon and molecular sieves.

Further, the control system comprises 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, a plurality of electromagnetic valves, a communication module, an upper computer, a local display module and a storage module, and also comprises control software, wherein the pressure sensor is arranged at an air inlet of the device, the concentration sensor is arranged at an air outlet, the liquid level meter is arranged at a recovery tank,

the pressure sensor is used for monitoring the air inlet pressure, the concentration sensor is used for monitoring the gas concentration of the air outlet, the liquid level meter is used for monitoring the liquid level in the absorption tank, the input module is used for reading the sensor signal and the state of the button, the microcontroller MCU is used for reading the 4-20mA analog signal and the digital signal of the control button which are collected by the sensor through the input module, and after the signals are calculated and processed, the decision is finally made, the state of the electromagnetic valve is controlled through the output module, the rotating speed of the vacuum pump is controlled through the frequency conversion module, and then the standby, the adsorption, the desorption, the air supplement and the recovery of the device are realized; after the microcontroller MCU processes and calculates the signals, the processed data is stored in the storage module, and is locally displayed and sent to the upper computer through the communication module;

the hardware structure and the control software are configured to:

a standby module, an adsorption module, a desorption module, a gas supplementing module, a recovery module and an oil gas concentration detection module,

the standby module comprises a pressure sensor, a vacuum pump and an electromagnetic valve, the vacuum pump is managed to be in a stop state, and the electromagnetic valve is managed to be in a closed state;

the adsorption module comprises a concentration sensor, a vacuum pump and an electromagnetic valve, the vacuum pump is managed to be in a low-speed rotation state, and the corresponding electromagnetic valve is in a state of being matched with the first adsorption tank and the second adsorption tank for adsorption; the desorption module comprises a concentration sensor, a vacuum pump and an electromagnetic valve, the vacuum pump is managed to be in a high-speed rotation state, the corresponding electromagnetic valve is in a state of being matched with the first adsorption tank and the second adsorption tank for desorption, so that oil and gas are separated, and oil flows back to enter the pipeline;

the gas supplementing module comprises a concentration sensor, a vacuum pump and an electromagnetic valve, the vacuum pump is managed to be in a stop state, the corresponding electromagnetic valve is in a state matched with gas supplementing, the adsorption tank is enabled to be swept and flows to the absorption tank through a pipeline for absorption, the absorption tank is fully fused with oil after absorbing oil gas, and the oil gas flows back to the oil storage tank through an oil return port again;

the recovery module comprises a liquid level meter and an electromagnetic valve, manages the liquid level of the absorption tank, opens the fifth electromagnetic valve when the liquid level in the absorption tank reaches a certain value, and closes the fifth electromagnetic valve when the liquid level is lower than the certain value;

the oil gas concentration detection module comprises an oil gas concentration detector which is arranged at the exhaust port, and when the concentration of the exhaust port exceeds the emission standard, the self-adaptive oil gas emission processing device automatically switches to a desorption process to prevent the unqualified harmful oil gas from being discharged into the air;

the invention also provides a self-adaptive oil gas emission treatment control method of the self-adaptive oil gas emission treatment device, which is characterized by comprising the following steps of:

s1, reading the sensor signal and the state of the button, and locally storing and sending the data to an upper computer and locally displaying;

s2, when the air pressure of the air inlet is insufficient, the system is in a standby state, and the vacuum pump and all the electromagnetic valves are in a closed state;

s3, entering an adsorption flow: if the emergency stop button and the stop button are not pressed, and the intake pressure P is more than or equal to P_OpenerAnd the system is not alarmed, the system enters an adsorption state and the frequency f is 15-20% of the rated power of the vacuum pump_{Is low in}Driving a vacuum pump to accelerate the volatile oil gas in the oil storage tank to quickly enter the adsorption tank for adsorption; if the emergency stop button and the stop button are pressed, or the intake pressure P is less than P_{To be treated}Or when an alarm occurs, the system enters a standby state; wherein P is_OpenerIs the starting pressure of the system, P_{To be treated}Is the standby pressure of the system;

s4, entering a desorption process: if the concentration C of the exhaust port is more than or equal to C in the adsorption process_{Removing 1}＜C_{Sign board}The system enters the desorption state and the maximum frequency f_{Height of}Driving a vacuum pump, vacuumizing the oil gas adsorbed in the adsorption tank, desorbing the oil gas, feeding the oil gas into a recovery pipeline, and finally feeding the oil gas into a recovery tank; if the concentration C of the exhaust port is less than C in the adsorption process_{Removing 1}The adsorption state is maintained. Wherein C is_{Removing 1}Is the starting concentration of the desorption process, C_{Sign board}Is the standard of emission concentration in national standard or row standard or landmark;

s5, entering a qi tonifying process: if the concentration C of the exhaust port is less than C in the desorption process_{Doff 2}＜C_{Removing 1}The system enters a gas supplementing state and is kept for a certain time; otherwise, continuously keeping the desorption state; wherein C is_{Doff 2}The system stops desorption and enters the concentration of a gas supplementing state;

s6, entering a recovery flow: after the air supply process is finished, if the liquid level H is more than or equal to H_{On the upper part}The system starts to recover oil gas and opens the liquid return valve; if the liquid level H is less than H_{Lower part}The system stops recovering oil gas and closes the liquid return valve; wherein H_{On the upper part}And H_{Lower part}The liquid level of the liquid return valve is started and closed respectively;

the above is a working period of the system, and after the system finishes the working period, the system automatically reciprocates to carry out the working period.

Further, the method also comprises the following steps

S7, steps S1-S6, provided that the concentration C of the exhaust port is not less than C_{Sign board}And the system is interrupted and enters a desorption process to ensure that the oil gas which does not reach the standard cannot be discharged into the atmosphere.

Further, in step S3, the vacuum pump is controlled by the frequency conversion module to have a frequency f of 20% of the rated power_{Is low in}Driving a vacuum pump; in step S4, the frequency conversion module controls the vacuum pump to have the frequency f of 100% of the rated power_{Height of}The vacuum pump is driven.

The invention has the advantages over the prior art that:

1. the invention has simple structure and convenient control method, leads the vacuum pump to adopt different pumping speeds in the adsorption and desorption stages, and enhances the absorption efficiency of the oil gas recovery device; specifically, in step S2, the frequency conversion module controls the vacuum pump to control the frequency f of 15-20% of rated power_{Is low in}Driving a vacuum pumpIn step S3, the frequency conversion module controls the vacuum pump to have a frequency f of 100% of the rated power_{Height of}The vacuum pump is driven, and the adsorption efficiency is improved by 85%; in the traditional device, the time of the adsorption stage accounts for 90-95% of the whole operation period, and the time of the adsorption stage of the device accounts for 30-40% of the whole operation period.

2. The two adsorption tanks are connected in a multistage series connection mode, so that the adsorption rate is enhanced.

3. The vacuum pump is bled in the absorption stage for oil gas in the oil storage tank is changeed to flow and is adsorbed in the adsorption tank, and oil gas is difficult for discharging from the gas vent, has strengthened oil gas recovery device's absorption efficiency.

4. The vacuum pump is subjected to time-sharing multiplexing aiming at the defects of the traditional devices, namely, air is pumped at a lower rotating speed in the adsorption stage, the adsorption efficiency is improved, and the vacuum pump is vacuumized at the maximum rotating speed in the desorption stage for desorption; the former is to rapidly pump out the oil gas volatilized from the oil storage tank through the air pumping action of the vacuum pump, and the oil gas enters the adsorption tank through the pipeline to be fully adsorbed; in the latter, the oil gas is fully contacted with the adsorption substance in the adsorption tank and adsorbed on the adsorption substance, and the oil adsorbed on the adsorption substance is separated from the adsorption substance by powerful air suction of a vacuum pump, enters a pipeline and finally enters a recovery tank; therefore, hardware resources can be fully utilized, a large amount of hardware cost is saved for achieving the same oil gas recovery effect, and conversely, if the method is not used and the same oil gas recovery effect is achieved, hardware needs to be added, and the cost is increased; the vacuum pump is fully utilized, and the adsorption and desorption efficiency is improved.

5. In the working period of the system, the system starts each working process in a self-adaptive manner by always depending on the data acquired by the sensor and the button state.

6. According to the air inlet pressure, the vacuum pump is adjusted to work at a lower rotating speed, so that the adsorption efficiency is improved; according to the concentration of the exhaust port, the desorption efficiency is improved by adjusting the vacuum pump at a high rotating speed; at any stage of the whole working period, desorption is carried out at the maximum rotating speed as long as the exhaust concentration exceeds the standard, and the harmlessness of the exhaust gas passing through the exhaust port is guaranteed.

In a word, this device's simple structure, control is convenient, and the multistage series structure of adsorption tank can effectual reinforcing oil gas adsorption efficiency, and the improvement desorption efficiency that the parallelly connected desorption structure of adsorption tank can maximize has promoted 85% adsorption efficiency. The time-sharing multiplexing of the vacuum pump not only does not reduce the adsorption capacity of the adsorption device in the adsorption stage, but also effectively reduces 80 percent of adsorption time, and efficient desorption can be carried out in the desorption stage, thereby fully utilizing the vacuum pump resources. In conventional devices, the adsorption phase takes 90% to 95% of the total operating cycle. The adsorption phase of the apparatus of the present invention takes 30-40% of the total operating cycle.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention;

FIG. 2 is a flow diagram of hydrocarbons in the adsorption process of the present invention in an apparatus;

FIG. 3 is a flow diagram of oil and gas in the device during desorption of the invention;

FIG. 4 is a flow diagram of the gas in the device during the gas make-up process of the present invention;

FIG. 5 is a control schematic block diagram of the present invention;

fig. 6 is a control flow diagram of the present invention.

Wherein: 1-air inlet, 11-first adsorption tank, 12-second adsorption tank, 21-first electromagnetic valve, 22-second electromagnetic valve, 23-third electromagnetic valve, 24-fourth electromagnetic valve, 25-fifth electromagnetic valve, 3-vacuum pump, 4-adsorption tank, 5-oil storage tank, 6-pipeline and 7-exhaust port.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Example 1

As shown in fig. 1, the adaptive oil gas discharge processing device based on the time-sharing multiplexing control algorithm of the invention comprises a plurality of oil gas adsorption tanks, a plurality of electromagnetic valves, a vacuum pump, an absorption tank, an oil storage tank and a pipeline;

the oil gas adsorption tanks are connected in series, and one ends of the oil gas adsorption tanks are connected in parallel;

one end of the first oil gas adsorption tank in the oil gas adsorption tanks is provided with an air inlet which is communicated with the oil storage tank; the other end of the last oil gas adsorption tank in the oil gas adsorption tanks is an exhaust port;

the electromagnetic valves are respectively arranged on pipelines among the oil storage tank, the oil gas adsorption tank, the vacuum pump and the absorption tank, and the opening and closing states of the pipelines are realized according to working requirements;

the vacuum pump is arranged between the absorption tank and the parallel ends of the oil gas adsorption tanks;

the absorption tank is communicated with the oil storage tank through a pipeline;

the system also comprises a control system, wherein the control system controls the vacuum pump and the electromagnetic valves to be opened, and the self-adaptive oil gas emission treatment process based on the time-sharing multiplexing control algorithm is completed.

The oil gas adsorption tanks are two first adsorption tanks and two second adsorption tanks, and one ends of the oil gas adsorption tanks are connected in parallel after being connected in series.

The number of the electromagnetic valves is five, and the electromagnetic valves comprise a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic 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 with a first electromagnetic valve through a pipeline, the front end of the first electromagnetic valve is an air inlet which is communicated with the oil storage tank, the outlet end of the second adsorption tank is connected with one end of a second electromagnetic valve through a pipeline, and the other end of the second electromagnetic valve is an air outlet; the other ends of the two adsorption tanks are connected with each other and connected with one end of a third electromagnetic valve; the other end of the third electromagnetic valve is simultaneously connected to an air inlet of the vacuum pump and one end of a fourth electromagnetic valve through a pipeline, and the other end of the fourth electromagnetic valve is connected with the outlet end of the second adsorption tank through a pipeline; the absorption tank is connected with the outside and is provided with two ports, wherein the first port is connected with the air outlet of the vacuum pump, the second port is connected with one end of the fifth electromagnetic valve through a pipeline, and the other end of the fifth electromagnetic valve is connected with the oil return port of the oil storage tank.

The adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device which are connected in parallel, wherein the first adsorption and desorption device and the second adsorption and desorption device are both an activated carbon adsorption and desorption device or a molecular sieve adsorption and desorption device.

Example 2

As shown in fig. 1, the adaptive oil gas discharge processing device based on the time-division multiplexing control algorithm of the present invention, as shown in fig. 1, includes a plurality of oil gas adsorption tanks, a plurality of electromagnetic valves, a vacuum pump, an absorption tank, an oil storage tank, and a pipeline;

the oil gas adsorption tanks are connected in series, and one ends of the oil gas adsorption tanks are connected in parallel;

one end of the first oil gas adsorption tank in the oil gas adsorption tanks is provided with an air inlet which is communicated with the oil storage tank; the other end of the last oil gas adsorption tank in the oil gas adsorption tanks is an exhaust port;

the electromagnetic valves are respectively arranged on pipelines among the oil storage tank, the oil gas adsorption tank, the vacuum pump and the absorption tank, and the opening and closing states of the pipelines are realized according to working requirements;

the vacuum pump is arranged between the absorption tank and the parallel ends of the oil gas adsorption tanks;

the absorption tank is communicated with the oil storage tank through a pipeline;

the system also comprises a control system, wherein the control system controls the vacuum pump and the electromagnetic valves to be opened, and the self-adaptive oil gas emission treatment process based on the time-sharing multiplexing control algorithm is completed.

The oil gas adsorption tanks are two first adsorption tanks and two second adsorption tanks, and one ends of the oil gas adsorption tanks are connected in parallel after being connected in series.

The number of the electromagnetic valves is five, and the electromagnetic valves comprise a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic 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 with a first electromagnetic valve through a pipeline, the front end of the first electromagnetic valve is an air inlet which is communicated with the oil storage tank, the outlet end of the second adsorption tank is connected with one end of a second electromagnetic valve through a pipeline, and the other end of the second electromagnetic valve is an air outlet; the other ends of the two adsorption tanks are connected with each other and connected with one end of a third electromagnetic valve; the other end of the third electromagnetic valve is simultaneously connected to an air inlet of the vacuum pump and one end of a fourth electromagnetic valve through a pipeline, and the other end of the fourth electromagnetic valve is connected with the outlet end of the second adsorption tank through a pipeline; the absorption tank is connected with the outside and is provided with two ports, wherein the first port is connected with the air outlet of the vacuum pump, the second port is connected with one end of the fifth electromagnetic valve through a pipeline, and the other end of the fifth electromagnetic valve is connected with the oil return port of the oil storage tank.

The adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device which are connected in parallel, wherein the first adsorption and desorption device and the second adsorption and desorption device are both an activated carbon adsorption and desorption device or a molecular sieve adsorption and desorption device.

The control system comprises 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, a plurality of electromagnetic valves, a communication module, an upper computer, a local display module and a storage module, and also comprises control software, wherein the pressure sensor is arranged at an air inlet of the device, the concentration sensor is arranged at an air outlet, the liquid level meter is arranged at a recovery tank,

the pressure sensor is used for monitoring the air inlet pressure, the concentration sensor is used for monitoring the gas concentration of the air outlet, the liquid level meter is used for monitoring the liquid level in the absorption tank, the input module is used for reading the sensor signal and the state of the button, the microcontroller MCU is used for reading the 4-20mA analog signal and the digital signal of the control button which are collected by the sensor through the input module, and after the signals are calculated and processed, the decision is finally made, the state of the electromagnetic valve is controlled through the output module, the rotating speed of the vacuum pump is controlled through the frequency conversion module, and then the standby, the adsorption, the desorption, the air supplement and the recovery of the device are realized; after the microcontroller MCU processes and calculates the signals, the processed data is stored in the storage module, and is locally displayed and sent to the upper computer through the communication module;

specifically, for an analog signal, the analog signal is converted into a digital quantity through an analog-to-digital converter (ADC) in the microcontroller MCU, the digital quantity and the measuring range of the sensor are subjected to linear operation, and finally, the actual physical quantity including the intake pressure and the exhaust concentration is calculated. The digital signal is activated, stopped, or abruptly stopped according to the high/low level (1 or 0) read by each button. The specific process of making a decision and controlling the state of the electromagnetic valve through the output module comprises the following steps: according to the air inlet pressure value and the air outlet concentration value detected by the sensor, the liquid level, the work flow of which step the switching system executes is determined, and the work flow comprises standby, adsorption, desorption, air supplement or recovery. And changes the state (open or closed) of the solenoid valve according to the work flow.

The hardware structure and the control software are configured to:

a standby module, an adsorption module, a desorption module, a gas supplementing module, a recovery module and an oil gas concentration detection module,

the standby module comprises a pressure sensor, a vacuum pump and an electromagnetic valve, the vacuum pump is managed to be in a stop state, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the fourth electromagnetic valve are in a closed state;

the adsorption module comprises a concentration sensor, a vacuum pump, a first electromagnetic valve and a second electromagnetic valve, the vacuum pump is managed to be in a low-speed rotation state, and the corresponding electromagnetic valves are in a state of being matched with the first adsorption tank and the second adsorption tank for adsorption;

the desorption module comprises a concentration sensor, a vacuum pump, a third electromagnetic valve and a fourth electromagnetic valve, the vacuum pump is managed to be in a high-speed rotation state, the corresponding electromagnetic valves are in a state of being matched with the first adsorption tank and the second adsorption tank for desorption, so that oil and gas are separated, and oil flows back to enter a pipeline;

the gas supplementing module comprises a concentration sensor, a vacuum pump and a fifth electromagnetic valve, the vacuum pump is managed to be in a stop state, the corresponding electromagnetic valve is in a matched gas supplementing state, the absorption tank is enabled to be blown and flows to the absorption tank through a pipeline for absorption, the absorption tank is fully fused with oil after absorbing oil gas, and the oil gas flows back to the oil storage tank through the oil return port again;

the recovery module comprises a liquid level meter and an electromagnetic valve, manages the liquid level of the absorption tank, opens the fifth electromagnetic valve when the liquid level in the absorption tank reaches a certain value, and closes the fifth electromagnetic valve when the liquid level is lower than the certain value;

the oil gas concentration detection module comprises an oil gas concentration detector and is arranged at the exhaust port, and when the concentration of the exhaust port exceeds the emission standard, the self-adaptive oil gas emission processing device automatically switches to a desorption process to prevent unqualified harmful oil gas from being discharged into the air.

Example 3

As shown in fig. 5, which is a control schematic block diagram of the present invention, and fig. 6 is a control flowchart of the present invention, the control method of the adaptive oil gas discharge processing device based on the time-division multiplexing control algorithm of the present invention includes the following steps:

s1, reading the sensor signal and the state of the button, and locally storing and sending the data to an upper computer and locally displaying;

s2, when the air pressure of the air inlet is insufficient, the system is in a standby state, and the vacuum pump and all the electromagnetic valves are in a closed state;

s3, entering an adsorption flow: if the emergency stop button and the stop button are not pressed, and the intake pressure P is more than or equal to P_OpenerAnd when the system does not give an alarm, the system enters an adsorption state, the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve are opened, and the frequency f is 15-20% of the rated power of the vacuum pump_{Is low in}Driving a vacuum pump to accelerate the volatile oil gas in the oil storage tank to quickly enter the adsorption tank for adsorption; if the emergency stop button and the stop button are pressed, or the intake pressure P is less than P_{To be treated}Or when an alarm occurs, the system enters a standby state; wherein P is_OpenerIs the starting pressure of the system, P_{To be treated}Is the standby pressure of the system;

s4, entering a desorption process: if the concentration C of the exhaust port is more than or equal to C and less than 1 and less than C standard in the adsorption process, the system enters a desorption state, the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve are closed, the third electromagnetic valve is opened, and the maximum frequency f is used_{Height of}Driving a vacuum pump, vacuumizing the oil gas adsorbed in the adsorption tank, desorbing the oil gas, feeding the oil gas into a recovery pipeline, and finally feeding the oil gas into a recovery tank; if the concentration C of the exhaust port is less than C in the adsorption process_{Removing 1}The adsorption state is maintained. Wherein C is_{Removing 1}Is the starting concentration of the desorption process, C_{Sign board}Is the standard of emission concentration in national standard or row standard or landmark;

s5, entering a qi tonifying process: if the concentration C of the exhaust port is less than C in the desorption process_{Doff 2}＜C_{Removing 1}When the system enters an air supplementing state, opening the first electromagnetic valve and the second electromagnetic valve, closing the vacuum pump and the third electromagnetic valve, and keeping for a certain time; otherwise, continuously keeping the desorption state; wherein C is_{Doff 2}The system stops desorption and enters the concentration of a gas supplementing state; when the gas is supplemented, air is used for purging the absorption tank, the residual oil gas is purged into the pipeline and flows into the absorption tank through the pipeline for absorption, and the oil gas is returned into the oil storage tank through the oil return port after being absorbed by the absorption tank;

s6, entering a recovery flow: after the air supply process is finished, if the liquid level H is more than or equal to H_{On the upper part}The system starts to recover oil gas, and a fifth electromagnetic valve is opened; if the liquid level H is less than H_{Lower part}The system stops recovering oil gas, and the fifth electromagnetic valve is closed; wherein H_{On the upper part}And H_{Lower part}The liquid level of the fifth electromagnetic valve is started and closed respectively;

the above is a working period of the system, and after the system finishes the working period, the system automatically reciprocates to carry out the working period.

Also comprises the following steps

S7, steps S1-S6, provided that the concentration C of the exhaust port is not less than C_{Sign board}And the system is interrupted and enters a desorption process to ensure that the oil gas which does not reach the standard cannot be discharged into the atmosphere.

In step S3, the frequency f is 20% of the rated power of the vacuum pump_{Is low in}Driving a vacuum pump; step by stepIn step S4, the frequency f is 100% of the rated power of the vacuum pump_{Height of}The vacuum pump is driven.