A carbon adsorption type closed-loop control device for oil and gas recovery

Abstract

This utility model relates to the field of oil and gas recovery control technology, and discloses a carbon adsorption-type closed-loop control device for oil and gas recovery. It aims to solve the technical problems of existing single-adsorption tank designs, which require shutdown during desorption, resulting in discontinuous oil and gas recovery, low efficiency, and reliance on manual experience for activated carbon saturation judgment, which easily leads to wasted energy or leakage risks. This utility model includes an oil and gas recovery component and a closed-loop control component. The oil and gas recovery component includes a condenser, a buried oil tank, and an adsorption tank. The closed-loop control component includes an oil and gas concentration sensor installed on the exhaust pipe of the adsorption tank and a vacuum sensor installed on the vacuum pipe. The control signal output terminal of the control module is connected to a drive module, which includes a desorption solenoid valve connected to the adsorption tank and a vacuum pump to start the vacuum pump and achieve desorption from the adsorption tank. This utility model significantly improves oil and gas recovery efficiency, safety, and automation level.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas recovery control technology, and in particular to a carbon adsorption type closed-loop control device for oil and gas recovery. Background Technology

[0002] Oil and gas recovery is an energy-saving and environmentally friendly new technology. It utilizes this technology to recover oil and gas emitted during storage, transportation, and loading / unloading, preventing air pollution caused by oil and gas volatilization, eliminating safety hazards, and improving energy utilization efficiency while reducing economic losses, thus yielding considerable economic benefits. Common methods include adsorption, absorption, condensation, and membrane separation systems. Adsorption utilizes the adsorption capacity of adsorbents such as activated carbon, silica gel, or activated fibers on the oil / gas / air mixture to separate oil and gas from air. Oil and gas pass through adsorbents such as activated carbon, with the oil and gas components adsorbed onto the adsorbent surface. Then, after depressurization or steam desorption, the enriched oil and gas is pumped into an oil tank or liquefied using other methods. Meanwhile, the adsorption capacity of activated carbon and other adsorbents for air is very weak, and the unadsorbed exhaust gas is discharged through the exhaust pipe.

[0003] The prior art Chinese patent document 200810097554.2 discloses a continuous circulation oil and gas adsorption and recovery method, including: (1) using an activated carbon bed in an adsorption tower to adsorb and recover oil and gas; (2) desorbing and regenerating the adsorption tower that is saturated with adsorption; (3) the desorbed high-concentration oil and gas enters the recovery tower and is absorbed by the liquid lean gasoline body; (4) the tail gas in the recovery tower re-enters the adsorption tower for cyclic adsorption; wherein at least two adsorption tanks in the adsorption tower alternately perform adsorption and desorption regeneration, so that the oil and gas adsorption can be continuously circulated, and remote monitoring can be achieved by using a fully automatic control program.

[0004] However, the above-mentioned solutions have at least the following technical problems during implementation: the single adsorption tank design requires shutdown during desorption, and operating parameters cannot be dynamically adjusted; this leads to discontinuous and inefficient oil and gas recovery; furthermore, the determination of activated carbon saturation relies on manual experience, making it impossible to dynamically assess the lifespan of the activated carbon adsorption material, which can easily result in wasted energy or leakage risks; and it cannot significantly reduce after-sales costs. Therefore, there is an urgent need to propose a carbon adsorption-based closed-loop control device for oil and gas recovery. Summary of the Invention

[0005] In view of the above technical problems, this disclosure provides a carbon adsorption type closed-loop control device for oil and gas recovery, which solves the technical problems of existing single adsorption tank designs requiring shutdown during desorption, and the inability to dynamically adjust operating parameters; resulting in discontinuous oil and gas recovery, low efficiency, and the reliance on manual experience to determine activated carbon saturation, making it impossible to dynamically judge the lifespan of the activated carbon adsorption material, which easily leads to wasted energy consumption or leakage risks; and the inability to significantly reduce after-sales costs.

[0006] According to one aspect of this disclosure, a carbon adsorption type oil and gas recovery closed-loop control device is provided, including an oil and gas recovery component and a closed-loop control component; the oil and gas recovery component includes a condenser, the condenser's inlet pipe is connected to the inlet of multiple buried oil tanks, the return oil pipe is connected to the return oil port of at least one buried oil tank, and the outlet pipe is diverted to at least two adsorption tanks arranged in parallel via an inlet solenoid valve; the adsorption tank is connected to the return oil pipe via a vacuum pipe, and a desorption solenoid valve, a vacuum sensor, and a vacuum pump are sequentially arranged along the fluid flow direction on the vacuum pipe;

[0007] The closed-loop control component includes a data acquisition module, which includes an oil and gas concentration sensor installed on the exhaust pipe of the adsorption tank and a vacuum sensor installed on the vacuum pipe. The sensor signal output terminal of the data acquisition module is connected to the control module to adaptively adjust the operating parameters and perform logical operations. The control signal output terminal of the control module is connected to the drive module, which includes a desorption solenoid valve connected to the adsorption tank and a vacuum pump to start the vacuum pump to realize the desorption of the adsorption tank.

[0008] In some embodiments of this disclosure, a flame arrester, a pressure transmitter, and an air pump are sequentially arranged along the gas flow direction on the intake pipe.

[0009] In some embodiments of this disclosure, a flame arrester is provided on the return oil line.

[0010] In some embodiments of this disclosure, a balance solenoid valve, an exhaust solenoid valve, and a flame arrester are sequentially arranged along the gas flow direction on the exhaust pipe of the adsorption tank.

[0011] In some embodiments of this disclosure, the control module is also connected to an alarm for reminding users to change the carbon in the adsorption tank.

[0012] In some embodiments of this disclosure, the vacuum pump is a dry vacuum pump.

[0013] In some embodiments of this disclosure, a temperature sensor is also provided on the exhaust pipe of the adsorption tank to detect the outlet temperature of the adsorption tank.

[0014] In some embodiments of this disclosure, a flow sensor is also provided on the vacuum pipeline for detecting the return oil flow rate of the vacuum pipeline.

[0015] The beneficial effects of this utility model are as follows:

[0016] It can dynamically adjust operating parameters to ensure that the device's emissions meet standards; it can determine the service life of the adsorption material, reducing the need for manual on-site verification; it can significantly extend the service life of the adsorption material, reducing operating costs; it can greatly improve the reliability of the device; and it can significantly save the manufacturer's after-sales expenses.

[0017] Continuous operation is achieved through alternating adsorption / desorption in at least two adsorption tanks, avoiding downtime issues associated with single-tank desorption. Dry vacuum pump desorption prevents lubricating oil contamination of the recovered oil and reduces maintenance costs. Flame arresters are installed on the inlet, return, and exhaust lines to prevent flame propagation. Vacuum sensors in the vacuum lines monitor desorption pressure in real time to prevent overpressure or leakage. Real-time data feedback from oil-gas concentration and flow sensors allows the control module to automatically adjust parameters such as desorption time and vacuum pump power to ensure timely desorption when adsorption is saturated. Temperature sensors monitor the outlet gas temperature of the adsorption tanks, triggering alarms or shutdowns in case of abnormal temperature rises. The vacuum pump start-stop frequency is optimized based on vacuum sensor data to reduce energy consumption. Pressure transmitters and flow sensors work together to control the speed of the gas delivery pump, matching the oil-gas load. The control module uses an alarm to prompt for activated carbon replacement based on adsorption time or efficiency decline trends, avoiding human error. The inlet line directly connects to multiple buried oil tanks for centralized processing of multi-source oil and gas. The return oil pipeline is linked with the vacuum pipeline, and the desorbed liquid oil is directly returned to the oil tank, forming a closed-loop recycling system. Attached Figure Description

[0018] Figure 1 Process flow diagram of carbon adsorption type closed-loop control device for oil and gas recovery;

[0019] Figure 2 Architecture diagram of a carbon adsorption type closed-loop control device for oil and gas recovery.

[0020] Figure 3 This is the control logic diagram for a carbon adsorption type oil and gas recovery closed-loop control device. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Example 1

[0022] This example discloses a carbon adsorption type closed-loop control device for oil and gas recovery. See [link to relevant documentation]. Figures 1 to 3 ;

[0023] It includes an oil and gas recovery component and a closed-loop control component; the oil and gas recovery component includes a condenser, the condenser's air inlet pipe is connected to the air inlet of multiple buried oil tanks, the oil return pipe is connected to the oil return port of at least one buried oil tank, and the air outlet pipe is diverted to at least two adsorption tanks arranged in parallel via an air inlet solenoid valve; the adsorption tank is connected to the oil return pipe via a vacuum pipe, and a desorption solenoid valve, a vacuum sensor, and a vacuum pump are sequentially installed on the vacuum pipe along the fluid flow direction;

[0024] The closed-loop control component includes a data acquisition module, which includes an oil and gas concentration sensor installed on the exhaust pipe of the adsorption tank and a vacuum sensor installed on the vacuum pipe. The sensor signal output terminal of the data acquisition module is connected to the control module to adaptively adjust the operating parameters and perform logical operations. The control signal output terminal of the control module is connected to the drive module, which includes a desorption solenoid valve connected to the adsorption tank and a vacuum pump to start the vacuum pump to realize the desorption of the adsorption tank.

[0025] A flame arrester, a pressure transmitter, and an air pump are installed sequentially along the gas flow direction on the intake pipe.

[0026] A flame arrester is installed on the return oil line.

[0027] The exhaust pipe of the adsorption tank is equipped with a balance solenoid valve, an exhaust solenoid valve, and a flame arrester in sequence along the gas flow direction.

[0028] The control module is also connected to an alarm for carbon replacement reminders in the adsorption tank.

[0029] The vacuum pump is a dry vacuum pump.

[0030] A temperature sensor is also installed on the exhaust pipe of the adsorption tank to detect the outlet temperature of the adsorption tank.

[0031] A flow sensor is also installed on the vacuum line to detect the return oil flow rate.

[0032] During operation, the oil vapors evaporating from underground oil tanks (such as gas station storage tanks) pass through the following sequentially via the intake pipe: flame arrester (explosion-proof) → pressure transmitter (pressure monitoring) → air pump (providing delivery power). The oil vapors enter a condenser for initial condensation; some high-concentration oil vapors liquefy and return to the oil tank via the return pipe. Uncondensed oil vapors are diverted from the condenser via the outlet pipe and enter the parallel adsorption tank through the intake solenoid valve. The activated carbon adsorption tank adsorbs the oil vapors, and the purified gas is discharged through the exhaust pipe: balancing solenoid valve (pressure regulation) → exhaust solenoid valve (emission control) → flame arrester (safety protection). An oil vapor concentration sensor detects the concentration of the emitted gas in the exhaust pipe to determine if the adsorption tank is saturated. An exhaust pipe temperature sensor monitors the adsorption tank's operating status and alarms when abnormal temperatures rise. When the oil vapor concentration sensor detects that the emission concentration is close to the set threshold, adsorption is saturated, or the operating time reaches a preset cycle, the control module initiates the desorption procedure. The intake solenoid valve is closed, stopping the oil vapors from entering the adsorption tank to be desorbed. The desorption solenoid valve and dry vacuum pump are activated to evacuate the adsorption tank. A vacuum sensor monitors the pressure in real time to ensure desorption efficiency. A flow sensor detects the return oil flow rate to optimize the desorption time. The desorbed high-concentration oil and gas are returned to the oil tank via the vacuum pipeline. While one adsorption tank is desorbing, other adsorption tanks remain in the adsorption state, ensuring continuous system operation. The control module dynamically adjusts the following based on data such as oil and gas concentration, vacuum level, flow rate, and temperature: the gas supply pump speed matches the oil and gas load; the vacuum pump power is optimized for energy consumption; and the desorption cycle prevents over-desorption. If pressure or temperature exceeds limits, the solenoid valve is immediately closed and an alarm is triggered. A flame arrester provides full protection, eliminating the risk of combustion and explosion. The control module records the activated carbon usage time and efficiency, and an alarm prompts for carbon replacement, avoiding human error.

[0033] Although some preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0034] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A carbon adsorption type closed-loop control device for oil and gas recovery, characterized in that: It includes an oil and gas recovery component and a closed-loop control component; the oil and gas recovery component includes a condenser, the condenser's air inlet pipe is connected to the air inlet of multiple buried oil tanks, the oil return pipe is connected to the oil return port of at least one buried oil tank, and the air outlet pipe is diverted to at least two adsorption tanks arranged in parallel via an air inlet solenoid valve; the adsorption tank is connected to the oil return pipe via a vacuum pipe, and a desorption solenoid valve, a vacuum sensor, and a vacuum pump are sequentially arranged along the fluid flow direction on the vacuum pipe; The closed-loop control component includes a data acquisition module, which includes an oil and gas concentration sensor installed on the exhaust pipe of the adsorption tank and a vacuum sensor installed on the vacuum pipe. The sensor signal output terminal of the data acquisition module is connected to the control module to adaptively adjust the operating parameters and perform logical operations. The control signal output terminal of the control module is connected to the drive module, which includes a desorption solenoid valve connected to the adsorption tank and a vacuum pump to start the vacuum pump to realize the desorption of the adsorption tank.

2. The carbon adsorption type oil and gas recovery closed-loop control device as described in claim 1, characterized in that: A flame arrester, a pressure transmitter, and an air pump are sequentially installed along the gas flow direction on the air intake pipe.

3. The carbon adsorption type oil and gas recovery closed-loop control device as described in claim 1, characterized in that: A flame arrester is installed on the return oil pipeline.

4. The carbon adsorption type oil and gas recovery closed-loop control device as described in claim 1, characterized in that: The exhaust pipe of the adsorption tank is equipped with a balance solenoid valve, an exhaust solenoid valve, and a flame arrester in sequence along the gas flow direction.

5. The carbon adsorption type oil and gas recovery closed-loop control device as described in claim 1, characterized in that: The control module is also connected to an alarm for reminding users to change the carbon in the adsorption tank.

6. The carbon adsorption type oil and gas recovery closed-loop control device as described in claim 1, characterized in that: The vacuum pump is a dry vacuum pump.

7. The carbon adsorption type oil and gas recovery closed-loop control device as described in claim 1, characterized in that: A temperature sensor is also installed on the exhaust pipe of the adsorption tank to detect the outlet temperature of the adsorption tank.

8. The carbon adsorption type oil and gas recovery closed-loop control device as described in claim 1, characterized in that: A flow sensor is also installed on the vacuum pipeline to detect the return oil flow rate of the vacuum pipeline.

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