CN112110407A - Double-frequency-conversion oil gas recovery gas-liquid ratio adjusting device and method - Google Patents
Double-frequency-conversion oil gas recovery gas-liquid ratio adjusting device and method Download PDFInfo
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- CN112110407A CN112110407A CN201910529001.8A CN201910529001A CN112110407A CN 112110407 A CN112110407 A CN 112110407A CN 201910529001 A CN201910529001 A CN 201910529001A CN 112110407 A CN112110407 A CN 112110407A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
- B67D7/0476—Vapour recovery systems
- B67D7/0478—Vapour recovery systems constructional features or components
- B67D7/048—Vapour flow control means, e.g. valves, pumps
- B67D7/0482—Vapour flow control means, e.g. valves, pumps using pumps driven at different flow rates
Abstract
The invention discloses a device and a method for adjusting a gas-liquid ratio of double-frequency-conversion oil gas recovery, and particularly relates to the technical field of oil gas recovery of a gas station. The problem of unqualified gas-liquid ratio caused by parameter drift of a current mechanical gas-liquid ratio adjusting mode, abrasion of an oil-gas recovery vacuum pump and insufficient maintenance manpower of equipment of a gas station is solved. Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device includes the controller, the controller includes the control mainboard, integrated central processing unit and the data acquisition module that links to each other with central processing unit on the control mainboard, the acousto-optic display module, storage module, communication module, gas-liquid ratio control module and central processing unit, even there is the measurement flowmeter on the controller, gas flowmeter, frequency conversion self priming pump and frequency conversion vacuum pump, the measurement flowmeter, gas flowmeter links to each other with data acquisition module, frequency conversion self priming pump, frequency conversion vacuum pump links to each other with gas-liquid ratio control module, it has LCD screen and bee calling organ to link on the acousto-optic display module, communication module possesses RS485 communication interface and handsheet ware interface.
Description
Technical Field
The invention relates to the technical field of oil gas recovery of gas stations, in particular to a device and a method for adjusting the gas-liquid ratio of double-frequency-conversion oil gas recovery.
Background
The oil gas recovery of the gas station is a process of recovering oil gas volatilized and overflowed nearby an oil tank opening in the refueling process to an underground storage tank by adopting vacuum auxiliary oil gas recovery equipment. According to the requirement of the national standard GB20952, the ratio of the volume of the recovered oil gas to the volume of the oil filling (gas-liquid ratio) is between 1 and 1.2.
The oil gas recovery equipment of the gas station is installed, so that the resource waste is avoided, the operation environment of the gas station is improved, the risk of oil gas explosion is reduced, the physical and mental health of staff is ensured, and a great effect is exerted on safety and environmental protection. However, the equipment stability is not high, so that the gas-liquid ratio parameter qualification rate of oil gas recovery in various places at present is generally low and is only about 50%. In order to ensure that the gas-liquid ratio is qualified and reaches the standard, a gas station needs to invest a large amount of manpower and material resources to carry out manual detection and is provided with a gas-liquid ratio detection instrument. At present, the mainstream secondary oil gas recovery equipment adopts a mechanical regulating valve to control the gas-liquid ratio, and the gas-liquid ratio can have larger drift after being used for a period of time, so that the gas-liquid ratio needs to be periodically calibrated. For part of old equipment, the oil-gas recovery vacuum pump is seriously abraded, the vacuum degree of a pump head is insufficient, and the lowest gas-liquid ratio requirement cannot be met even if the mechanical regulating valve is regulated to the maximum opening degree. In this case, the oil gas recovery vacuum pump needs to be frequently replaced, which causes heavy economic burden to the gasoline station.
Besides high equipment failure rate, numerous factors can influence the gas-liquid ratio of the refueling operation in the actual operation process of the refueling station. The current monitoring of the ratio of the artificial gas to the artificial gas is static detection of a sealing station, the working condition is stable, interference factors are less, and the ratio of the artificial gas to the artificial gas is relatively easy to guarantee to be stable. In the actual operation process, factors such as fluctuation of oil filling amount, fluctuation of oil tank pressure, unreasonable pipeline arrangement, centralized oil gas recovery equipment and the like can cause fluctuation of gas-liquid ratio, so that oil gas is dissipated and discharged.
Along with the increasing importance of people on the environmental protection problem of the gas station, the supervision on the running state of the environmental protection equipment of the gas station is also stricter. Therefore, the normal operation of secondary oil gas recovery needs to be guaranteed through technical means in a gas station, the workload of manual inspection is reduced, and the stability of secondary oil gas recovery equipment is improved.
Disclosure of Invention
The invention aims to overcome the defects, and provides a double-frequency-conversion oil-gas recovery gas-liquid ratio adjusting device and method which can comprehensively ensure that the gas-liquid ratio reaches the standard by controlling a frequency-conversion self-priming pump and a frequency-conversion oil-gas recovery vacuum pump and adjusting the oiling flow rate and the return air flow rate simultaneously, and can keep the oiling flow rate at the maximum value on the basis of the gas-liquid ratio reaching the standard.
The invention specifically adopts the following technical scheme:
double-frequency-conversion oil gas recovery gas-liquid ratio adjusting device for carrying out feedback adjustment on oil gas recovery gas-liquid ratio parameters through oil feeding amount and air return amount, and adjusting oil feeding flow speed and air return flow speed through controlling a frequency conversion self-priming pump and a frequency conversion oil gas recovery vacuum pump
Preferably, two frequency conversion oil gas recovery gas-liquid ratio adjusting device, which comprises a controller, the controller includes the control mainboard, integrated data acquisition module, reputation display module, storage module, communication module, gas-liquid ratio control module and the central processing unit that have central processing unit and link to each other with central processing unit on the control mainboard, even have measurement flowmeter, gas flowmeter, frequency conversion self priming pump and frequency conversion vacuum pump on the controller, measurement flowmeter, gas flowmeter link to each other with data acquisition module, frequency conversion self priming pump, frequency conversion vacuum pump link to each other with gas-liquid ratio control module.
Preferably, the acousto-optic display module is connected with a liquid crystal screen and a buzzer and used for displaying current oil gas recovery information and prompting alarm content.
Preferably, the acousto-optic display module is connected with a liquid crystal screen and a light alarm for displaying current oil gas recovery information and prompting alarm content.
Preferably, the communication module is provided with an RS485 communication interface and a handsheet device interface.
Preferably, the metering flowmeter and the variable-frequency self-priming pump are arranged on an oil way of the oiling machine; the gas flowmeter and the variable-frequency vacuum pump are arranged on the gas circuit of the oiling machine.
The double-frequency-conversion oil gas recovery gas-liquid ratio adjusting method adopts the double-frequency-conversion oil gas recovery gas-liquid ratio adjusting device and comprises the following steps:
71. the data acquisition module detects an oiling pulse sent by the metering flowmeter and starts a gas-liquid ratio closed-loop regulation action;
72. the variable frequency self-priming pump is gradually increased to the highest rotating speed under the control of the oiling execution unit; the variable frequency vacuum pump is gradually increased to the highest rotating speed under the control of the air return execution unit;
73. waiting for a data acquisition period;
74. judging whether the variable frequency self-priming pump and the variable frequency vacuum pump reach the highest frequency; if yes, the next step is carried out, and if not, the step returns to 73;
75. the central processing unit carries out data processing in real time according to the oiling pulse and the return air pulse to obtain the oiling amount, the return air amount and the gas-liquid ratio at the current time point, and judges whether the air suction speed is more than or equal to 1.1 multiplied by the oiling speed; if yes, the rotating speed of the variable-frequency self-priming pump is unchanged, the rotating speed of the variable-frequency vacuum pump is adjusted, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1; if not, the rotating speed of the variable-frequency vacuum pump is unchanged, the rotating speed of the variable-frequency self-priming pump is adjusted, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1;
76. the data acquisition module detects that no refueling pulse exists, judges that the refueling process is finished, and the storage module stores the refueling information;
77. judging whether the average refueling flow speed is less than 15L/min or the gas-liquid ratio is less than 1 or the gas-liquid ratio is greater than 1.2 in the refueling process, if so, sending out a buzzing alarm according to the three conditions, displaying corresponding alarm information by a liquid crystal screen, and finishing the closed-loop regulation; if not, the closed-loop regulation is directly finished.
Preferably, the information stored in the memory module in 76 for this fueling includes fueling amount, return air amount, gas-liquid ratio, average fueling flow rate, and average return air flow rate.
Preferably, in 73, a data acquisition period is defined as T10-2000 ms.
Preferably, in the step 75, the rotating speed of the variable frequency vacuum pump is adjusted by adopting a PID control algorithm.
The invention has the following beneficial effects:
the device can adjust the gas-liquid ratio parameter of the oil-gas recovery by controlling the variable-frequency self-priming pump and the variable-frequency oil-gas recovery vacuum pump, and can improve the stability and the qualification rate of the gas-liquid ratio by adjusting the oil-filling flow rate and the air-returning flow rate simultaneously, and the oil-filling flow rate is kept at the maximum value on the basis of the gas-liquid ratio reaching the standard.
Drawings
FIG. 1 is a structural block diagram of a double-frequency-conversion oil-gas recovery gas-liquid ratio adjusting device;
FIG. 2 is a flow chart of a method for adjusting the gas-liquid ratio of double-frequency-conversion oil gas recovery.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1:
example one
Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device, its characterized in that for carry out feedback control to oil gas recovery gas-liquid ratio parameter through adding oil volume and return-air volume, through the control to frequency conversion self priming pump and frequency conversion oil gas recovery vacuum pump, adjust and refuel velocity of flow and return-air velocity.
Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device, which comprises a controller, the controller includes the control mainboard, the integrated data acquisition module that has central processing unit and link to each other with central processing unit on the control mainboard, the acousto-optic display module, storage module, communication module, gas-liquid ratio control module and central processing unit, but data acquisition module gathers refueling signal and return-air signal, even there is the measurement flowmeter on the controller, gas flowmeter, frequency conversion self priming pump and frequency conversion vacuum pump, the measurement flowmeter, gas flowmeter links to each other with the data acquisition module, the frequency conversion self priming pump, the frequency conversion vacuum pump links to each other with gas-liquid ratio control module, steerable frequency conversion self priming pump and frequency conversion vacuum pump frequency.
The metering flowmeter and the variable-frequency self-priming pump are arranged on an oil way of the oiling machine; the gas flowmeter and the variable-frequency vacuum pump are arranged on the gas circuit of the oiling machine.
As shown in fig. 2, the method for adjusting the gas-liquid ratio recovered by using double-frequency-conversion oil gas comprises the following steps:
71. the data acquisition module detects an oiling pulse sent by the metering flowmeter and starts a gas-liquid ratio closed-loop regulation action;
72. the variable frequency self-priming pump is gradually increased to the highest rotating speed under the control of the oiling execution unit; the variable frequency vacuum pump is gradually increased to the highest rotating speed under the control of the air return execution unit;
73. waiting for a data acquisition period T of 10-2000 ms;
74. judging whether the variable frequency self-priming pump and the variable frequency vacuum pump reach the highest frequency; if yes, the next step is carried out, otherwise, the step returns to 53;
75. the central processing unit carries out data processing in real time according to the oiling pulse and the return air pulse to obtain the oiling amount, the return air amount and the gas-liquid ratio at the current time point, and judges whether the air suction speed is more than or equal to 1.1 multiplied by the oiling speed; if yes, the rotating speed of the variable-frequency self-priming pump is unchanged, the rotating speed of the variable-frequency vacuum pump is adjusted by adopting a PID control algorithm, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1; if not, the rotating speed of the variable-frequency vacuum pump is unchanged, the rotating speed of the variable-frequency self-priming pump is adjusted by adopting a PID control algorithm, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1;
76. the data acquisition module detects that no refueling pulse exists, judges that the refueling process is finished, and the storage module stores the refueling information; the information of the refueling stored in the storage module comprises refueling volume, return air volume, gas-liquid ratio, average refueling flow speed and average return air flow speed.
77. Judging whether the average refueling flow speed is less than 15L/min or the gas-liquid ratio is less than 1 or the gas-liquid ratio is greater than 1.2 in the refueling process, if so, sending out a buzzing alarm according to the three conditions, displaying corresponding alarm information by a liquid crystal screen, and finishing the closed-loop regulation; if not, the closed-loop regulation is directly finished.
Example two
Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device, its characterized in that for carry out feedback control to oil gas recovery gas-liquid ratio parameter through adding oil volume and return-air volume, through the control to frequency conversion self priming pump and frequency conversion oil gas recovery vacuum pump, adjust and refuel velocity of flow and return-air velocity.
Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device, which comprises a controller, the controller includes the control mainboard, the integrated data acquisition module that has central processing unit and link to each other with central processing unit on the control mainboard, the acousto-optic display module, storage module, communication module, gas-liquid ratio control module and central processing unit, but data acquisition module gathers refueling signal and return-air signal, even there is the measurement flowmeter on the controller, gas flowmeter, frequency conversion self priming pump and frequency conversion vacuum pump, the measurement flowmeter, gas flowmeter links to each other with the data acquisition module, the frequency conversion self priming pump, the frequency conversion vacuum pump links to each other with gas-liquid ratio control module, steerable frequency conversion self priming pump and frequency conversion vacuum pump frequency.
The acousto-optic display module is connected with a liquid crystal screen and a buzzer and used for displaying current oil gas recovery information and prompting alarm content.
The metering flowmeter and the variable-frequency self-priming pump are arranged on an oil way of the oiling machine; the gas flowmeter and the variable-frequency vacuum pump are arranged on the gas circuit of the oiling machine.
As shown in fig. 2, the method for adjusting the gas-liquid ratio recovered by using double-frequency-conversion oil gas comprises the following steps:
71. the data acquisition module detects an oiling pulse sent by the metering flowmeter and starts a gas-liquid ratio closed-loop regulation action;
72. the variable frequency self-priming pump is gradually increased to the highest rotating speed under the control of the oiling execution unit; the variable frequency vacuum pump is gradually increased to the highest rotating speed under the control of the air return execution unit;
73. waiting for a data acquisition period T of 10-2000 ms;
74. judging whether the variable frequency self-priming pump and the variable frequency vacuum pump reach the highest frequency; if yes, the next step is carried out, and if not, the step returns to 73;
75. the central processing unit carries out data processing in real time according to the oiling pulse and the return air pulse to obtain the oiling amount, the return air amount and the gas-liquid ratio at the current time point, and judges whether the air suction speed is more than or equal to 1.1 multiplied by the oiling speed; if yes, the rotating speed of the variable-frequency self-priming pump is unchanged, the rotating speed of the variable-frequency vacuum pump is adjusted by adopting a PID control algorithm, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1; if not, the rotating speed of the variable-frequency vacuum pump is unchanged, the rotating speed of the variable-frequency self-priming pump is adjusted by adopting a PID control algorithm, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1;
76. the data acquisition module detects that no refueling pulse exists, judges that the refueling process is finished, and the storage module stores the refueling information; the information of the refueling stored in the storage module comprises refueling volume, return air volume, gas-liquid ratio, average refueling flow speed and average return air flow speed.
77. Judging whether the average refueling flow speed is less than 15L/min or the gas-liquid ratio is less than 1 or the gas-liquid ratio is greater than 1.2 in the refueling process, if so, sending out a buzzing alarm according to the three conditions, displaying corresponding alarm information by a liquid crystal screen, and finishing the closed-loop regulation; if not, the closed-loop regulation is directly finished.
EXAMPLE III
Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device, its characterized in that for carry out feedback control to oil gas recovery gas-liquid ratio parameter through adding oil volume and return-air volume, through the control to frequency conversion self priming pump and frequency conversion oil gas recovery vacuum pump, adjust and refuel velocity of flow and return-air velocity.
Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device, which comprises a controller, the controller includes the control mainboard, the integrated data acquisition module that has central processing unit and link to each other with central processing unit on the control mainboard, the acousto-optic display module, storage module, communication module, gas-liquid ratio control module and central processing unit, but data acquisition module gathers refueling signal and return-air signal, even there is the measurement flowmeter on the controller, gas flowmeter, frequency conversion self priming pump and frequency conversion vacuum pump, the measurement flowmeter, gas flowmeter links to each other with the data acquisition module, the frequency conversion self priming pump, the frequency conversion vacuum pump links to each other with gas-liquid ratio control module, steerable frequency conversion self priming pump and frequency conversion vacuum pump frequency.
The acousto-optic display module is connected with a liquid crystal screen and a buzzer and used for displaying current oil gas recovery information and prompting alarm content.
The communication module is provided with an RS485 communication interface and a hand-copy device interface, the RS485 communication mode can carry out data transmission with external equipment, and the hand-copy device interface is connected with the hand-copy device and can set a gas-liquid ratio set value, a PID parameter, an alarm range and the like
The metering flowmeter and the variable-frequency self-priming pump are arranged on an oil way of the oiling machine; the gas flowmeter and the variable-frequency vacuum pump are arranged on the gas circuit of the oiling machine.
As shown in fig. 2, the method for adjusting the gas-liquid ratio recovered by using double-frequency-conversion oil gas comprises the following steps:
71. the data acquisition module detects an oiling pulse sent by the metering flowmeter and starts a gas-liquid ratio closed-loop regulation action;
72. the variable frequency self-priming pump is gradually increased to the highest rotating speed under the control of the oiling execution unit; the variable frequency vacuum pump is gradually increased to the highest rotating speed under the control of the air return execution unit;
73. and waiting for a data acquisition period T which is 10ms, 100ms and 1000 ms.
74. Judging whether the variable frequency self-priming pump and the variable frequency vacuum pump reach the highest frequency; if yes, the next step is carried out, and if not, the step returns to 73;
75. the central processing unit carries out data processing in real time according to the oiling pulse and the return air pulse to obtain the oiling amount, the return air amount and the gas-liquid ratio at the current time point, and judges whether the air suction speed is more than or equal to 1.1 multiplied by the oiling speed; if yes, the rotating speed of the variable-frequency self-priming pump is unchanged, the rotating speed of the variable-frequency vacuum pump is adjusted by adopting a PID control algorithm, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1; if not, the rotating speed of the variable-frequency vacuum pump is unchanged, the rotating speed of the variable-frequency self-priming pump is adjusted by adopting a PID control algorithm, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1;
76. the data acquisition module detects that no refueling pulse exists, judges that the refueling process is finished, and the storage module stores the refueling information; the information of the refueling stored in the storage module comprises refueling volume, return air volume, gas-liquid ratio, average refueling flow speed and average return air flow speed.
77. Judging whether the average refueling flow speed is less than 15L/min or the gas-liquid ratio is less than 1 or the gas-liquid ratio is greater than 1.2 in the refueling process, if so, sending out a buzzing alarm according to the three conditions, displaying corresponding alarm information by a liquid crystal screen, and finishing the closed-loop regulation; if not, the closed-loop regulation is directly finished.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. Double-frequency conversion oil gas recovery gas-liquid ratio adjusting device, its characterized in that for carry out feedback control to oil gas recovery gas-liquid ratio parameter through adding oil volume and return-air volume, through the control to frequency conversion self priming pump and frequency conversion oil gas recovery vacuum pump, adjust and refuel velocity of flow and return-air velocity.
2. The dual-frequency conversion oil-gas recovery gas-liquid ratio adjusting device of claim 1, which comprises a controller, wherein the controller comprises a control mainboard, a central processing unit and a data acquisition module connected with the central processing unit, an acousto-optic display module, a storage module, a communication module, a gas-liquid ratio control module and a central processing unit are integrated on the control mainboard, a metering flowmeter, a gas flowmeter, a frequency conversion self-priming pump and a frequency conversion vacuum pump are connected on the controller, the metering flowmeter and the gas flowmeter are connected with the data acquisition module, and the frequency conversion self-priming pump and the frequency conversion vacuum pump are connected with the gas-liquid ratio control module.
3. The dual-frequency-conversion oil-gas recovery gas-liquid ratio adjusting device of claim 1, wherein the acousto-optic display module is connected with a liquid crystal screen and a buzzer for displaying current oil-gas recovery information and prompting alarm content.
4. The dual-frequency-conversion oil-gas recovery gas-liquid ratio adjusting device of claim 1, wherein the acousto-optic display module is connected with a liquid crystal screen and a light alarm for displaying current oil-gas recovery information and prompting alarm content.
5. The dual frequency conversion oil gas recovery gas-liquid ratio adjustment device of claim 1, wherein the communication module is provided with an RS485 communication interface and a handsheet interface.
6. The dual variable frequency oil gas recovery gas-liquid ratio adjustment device of claim 1, wherein the metering flowmeter and the variable frequency self-priming pump are mounted on an oil way of the oiling machine; the gas flowmeter and the variable-frequency vacuum pump are arranged on the gas circuit of the oiling machine.
7. The method for adjusting the gas-liquid ratio recovered by double-frequency-conversion oil gas adopts the device for adjusting the gas-liquid ratio recovered by double-frequency-conversion oil gas as claimed in any one of claims 1 to 4, and is characterized by comprising the following steps of:
71. the data acquisition module detects an oiling pulse sent by the metering flowmeter and starts a gas-liquid ratio closed-loop regulation action;
72. the variable frequency self-priming pump is gradually increased to the highest rotating speed under the control of the oiling execution unit; the variable frequency vacuum pump is gradually increased to the highest rotating speed under the control of the air return execution unit;
73. waiting for a data acquisition period;
74. judging whether the variable frequency self-priming pump and the variable frequency vacuum pump reach the highest frequency; if yes, the next step is carried out, and if not, the step returns to 73;
75. the central processing unit carries out data processing in real time according to the oiling pulse and the return air pulse to obtain the oiling amount, the return air amount and the gas-liquid ratio at the current time point, and judges whether the air suction speed is more than or equal to 1.1 multiplied by the oiling speed; if yes, the rotating speed of the variable-frequency self-priming pump is unchanged, the rotating speed of the variable-frequency vacuum pump is adjusted, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1; if not, the rotating speed of the variable-frequency vacuum pump is unchanged, the rotating speed of the variable-frequency self-priming pump is adjusted, and the control target is as follows: total amount of inspiration/total amount of fueling is 1.1;
76. the data acquisition module detects that no refueling pulse exists, judges that the refueling process is finished, and the storage module stores the refueling information;
77. and judging whether the average refueling flow speed is less than 15L/min or the gas-liquid ratio is less than 1 or the gas-liquid ratio is greater than 1.2 in the refueling process, if so, sending a buzzer alarm according to the three conditions, displaying corresponding alarm information by a liquid crystal screen, finishing the closed-loop regulation, and if not, directly finishing the closed-loop regulation.
8. The method for adjusting gas-liquid ratio of dual variable frequency oil gas recovery of claim 7, wherein the information stored in the memory module of 76 for the refueling comprises refueling volume, return gas volume, gas-liquid ratio, average refueling flow rate and average return gas flow rate.
9. The method for adjusting the gas-liquid ratio of double-frequency-conversion oil gas recovery according to claim 7, wherein in 73, a data acquisition period is defined as T10-2000 ms.
10. The method for adjusting gas-liquid ratio of dual variable frequency oil gas recovery of claim 7, wherein in 75, PID control algorithm is used to adjust the rotation speed of the variable frequency vacuum pump.
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| CN113548633A (en) * | 2021-08-04 | 2021-10-26 | 维德路特油站设备(上海)有限公司 | Oil gas recovery system and refueling equipment |
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| CN113548633A (en) * | 2021-08-04 | 2021-10-26 | 维德路特油站设备(上海)有限公司 | Oil gas recovery system and refueling equipment |
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