CN216572314U - Filling station's cubic vapor recovery system - Google Patents
Filling station's cubic vapor recovery system Download PDFInfo
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- CN216572314U CN216572314U CN202121297731.9U CN202121297731U CN216572314U CN 216572314 U CN216572314 U CN 216572314U CN 202121297731 U CN202121297731 U CN 202121297731U CN 216572314 U CN216572314 U CN 216572314U
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Abstract
The invention relates to a tertiary oil gas recovery system of a gas station. Comprises an air-inducing pump, a condensing box, a refrigerating unit and a recovery tank; the air-entraining pump is arranged between the underground oil tank and the condensing tank and is used for pumping oil gas in the underground oil tank into the condensing tank; the condensing tank is used for cooling and liquefying the oil gas; the refrigerating unit provides cold energy for the condensing box; one end of the recovery tank is connected with an oil outlet of the condensing tank through a pipeline and is used for storing cooled and liquefied oil, and the other end of the recovery tank is communicated with the underground oil tank through a pipeline; the device also comprises an adsorption and desorption device, a vacuum pump and a control system. The beneficial effects are as follows: the investment is small, the cost is low, and the market popularization and application value is high; cost is reduced by 20% compared with a similar system in the prior art; the operation energy consumption is low, the resources are saved, and the operation cost is low. The working temperature of the condensing box is controlled between minus 25 ℃ and minus 15 ℃, more than 90% of oil gas can be cooled and liquefied in the temperature range, the frequent start and stop of a refrigerating unit are avoided, and the comprehensive energy consumption is reduced by more than half.
Description
Technical Field
The invention relates to the technical field of oil gas recovery and treatment, in particular to a tertiary oil gas recovery system of a gas station.
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, adsorption, membrane separation and the like. The condensation method is characterized in that the heat of oil gas is replaced by utilizing a refrigeration technology to realize the direct conversion of oil gas components from a gas phase to a liquid phase, the principle is simple, but the gas is generally cooled to-30 to-50 ℃ or even lower, and because of the rapid change of the oil gas temperature before and after condensation, if devices such as defrosting and deicing are not added, the oil outlet pipe is easy to be condensed or frozen and blocked, so that the condensation efficiency is reduced, the failure rate of a valve on a pipeline is increased, and the stable operation of the whole oil gas recovery is further influenced.
CN207276194U 'oil gas processing device at a filling station', the refrigeration system of the patent is to cool and liquefy the desorbed oil gas. The defects are that the load of the adsorbent is large, and the replacement period of the adsorbent is short; the device has more equipment, large investment and high energy consumption. CN212253363U oil gas treatment system by compression condensation adsorption method, which is to pressurize oil gas to 1.2MPa, then cool and adsorb. The method has the disadvantages that the energy consumption is high, the oil-gas compressor is increased, and the liquid gasoline (1.2MPa) can be partially gasified when being discharged to the oil storage tank, so that the light components are circularly compressed and cooled for multiple times; the investment is large, the working pressure of all equipment and pipelines is 1.2MPa, and the corresponding cost is increased. CN206492360U adsorption and condensation device for oil gas recovery, the working principle of the patent is firstly condensation and then adsorption and desorption, and the defect is that an air-introducing pump is not used, the air resistance of the device is large, and the oil storage tank is easy to overpressure; light hydrocarbon components are easily enriched in the device, so that the device operates frequently; two sets of refrigerating units are arranged, the refrigerating temperature is low (-60 ℃), the energy consumption is high, and the investment is large. CN106807179A "an adsorption condensation oil gas recovery device and oil gas recovery process using self-adsorption heat regeneration", the refrigeration system of the patent is to cool and liquefy the desorbed oil gas. The defect is that an air guide pump is not arranged, the air resistance of the device is large, and the oil storage tank is easy to generate overpressure; the load of the adsorbent is large, and the replacement period of the adsorbent is short; two vacuum pumps and three sets of refrigerating units are arranged, the refrigerating temperature is low (-80 to-50 ℃), the power of the whole machine is 120kW (the power of the device proposed by the patent applications is 1.8kW), the energy consumption is high, and the investment is large.
In summary, the existing gas station tertiary oil gas recovery technology has the following disadvantages: 1. the investment is large, the cost is high, and the market popularization and application value is not large; 2. the operation energy consumption is high, and resources are wasted; 3. the device has too many devices, which is not beneficial to maintenance; 4. emergency interlocking parking protection is not provided for the conditions of over-temperature, over-pressure and the like in the system operation process; 5. the oil outlet pipe of the condensing device is easy to condense or freeze and block, so that the condensing efficiency is reduced, the failure rate of a valve on a pipeline is increased, and the stable operation of the whole oil gas recovery is influenced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a tertiary oil gas recovery system which can continuously and stably operate, has low system cost (low investment cost and operation cost), simple structure, long service life and easy operation, and is beneficial to maintenance and repair.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a three-time oil gas recovery system of a gas station is characterized by comprising an air guide pump, a condensation box, a refrigerating unit and a recovery tank; the air-entraining pump is arranged between the underground oil tank and the condensing tank and is used for pumping oil gas in the underground oil tank into the condensing tank; the condensing box is a heat exchange place of oil gas and a refrigerant and is used for cooling and liquefying the oil gas, the condensing box is of a sealing structure, and the condensing box is provided with an oil gas inlet, an oil gas outlet and an oil liquid outlet; the refrigerating unit provides cold energy for the condensing box; one end of the recovery tank is connected with an oil outlet of the condensing tank through a pipeline and is used for storing cooled and liquefied oil, and the other end of the recovery tank is communicated with an underground oil tank through a pipeline;
also comprises an absorption and desorption device which is provided with a plurality of absorption and desorption devices,
the oil-gas inlet end of the adsorption and desorption device is communicated with the oil-gas outlet end of the condensing box through an oil-gas pipeline and is also communicated with the oil-gas inlet end of the condensing box; the oil gas outlet end of the adsorption and desorption device is emptied;
also comprises a vacuum pump,
the vacuum pump is arranged between the oil gas inlet end of the condensing device and the oil gas inlet end of the absorption and desorption device and is used for extracting and desorbing the absorbed oil gas in the absorption and desorption device;
also comprises a control system which is used for controlling the operation of the electric motor,
and the control system automatically controls the working conditions according to the pressure value in the underground oil tank, the liquid level value in the recovery tank and the AE-01 value of the absorption and desorption device.
Further, the control system comprises a system start-stop module, an interlocking control module, an oil liquid recovery module, an absorption and desorption module and a data acquisition module,
the start-stop module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump and is used for controlling the start and stop of the system according to the change of the pressure value;
the interlocking control module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump, when the pressure value is higher than a set value, the air-entraining pump is started, and when the pressure value is lower than the set value, the air-entraining pump is stopped;
the oil liquid recovery module comprises a liquid level sensor arranged on the recovery tank, the oil liquid is controlled to flow back to the underground oil tank according to the change of the liquid level value in the recovery tank, and when the liquid level reaches a set value, the discharge valve is opened, and the liquid gasoline flows back to the underground gasoline storage tank;
the adsorption and desorption module comprises a gas concentration detector arranged at an outlet of the adsorption and desorption device, and is used for controlling adsorption of oil gas or desorption of oil gas according to the change of AE-01 value in the adsorption and desorption device, when the detection value AE-01 is higher than a set value, the air-entraining pump is stopped, and meanwhile, the adsorption and desorption process is switched from adsorption to desorption to start the desorption process; the device also comprises a temperature sensor on the adsorption and desorption device, when the temperature value is higher than a set value, the air-entraining pump stops, and the adsorption and desorption process is switched from adsorption to desorption to start the desorption process;
when the detection value AE-01 is higher than a set value, the adsorption and desorption device is used for switching to desorption when the oil gas adsorbed by the adsorption and desorption device is saturated;
the temperature set value is 50 ℃, the temperature value is 50 ℃ higher than the temperature value, the activated carbon is damaged, the deactivation is caused, if the desorption is switched, the temperature reduction process is started, the temperature in the adsorption and desorption device is ensured not to be higher than 50 ℃, and the system is protected; the real state is difficult to reach, if the quality of the activated carbon has problems, the condition of reaching 50 ℃ can also appear, the normal operation of the system can be ensured through the control switching of the adsorption and desorption module, and the system is safe and has no fault.
The data acquisition module is used for acquiring temperature values, pressure values, liquid level values and AE-01 values.
Furthermore, the refrigerating unit can realize double control of temperature and pressure,
specifically, the working temperature of the condensing box is controlled between minus 25 ℃ and minus 15 ℃, more than 90% of oil gas can be cooled and liquefied in the temperature range, and meanwhile, the refrigerating unit is prevented from being started and stopped frequently, so that the comprehensive energy consumption is low; when the temperature value in the condensing box is higher than minus 15 ℃, the refrigerating unit is started, and when the temperature value in the condensing box is lower than minus 25 ℃, the refrigerating unit is stopped; alternatively, the refrigeration unit is started when the pressure value between the underground oil tank and the bleed air pump is higher than the highest set value (different systems correspond to different values, for example 50pa-500pa), and the refrigeration unit is stopped when the pressure value between the underground oil tank and the bleed air pump is lower than the lowest set value (-50pa-0 pa).
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, and both the first adsorption and desorption device and the second adsorption and desorption device are activated carbon adsorption and desorption devices.
Further, the first adsorption-desorption device and the second adsorption-desorption device are automatically switched to be used when adsorbing and desorbing oil gas, the adsorption-desorption module is automatically switched to the second adsorption-desorption device to adsorb the oil gas after the AE-01 value of the oil gas outlet end of the adsorption-desorption device reaches a set value, meanwhile, the vacuum pump is started to carry out vacuum desorption on the oil gas of the first adsorption-desorption device, and the desorbed oil gas enters the oil gas inlet of the condensing box; the first adsorption-desorption device and the second adsorption-desorption device are alternately used, and the switching of adsorption/desorption is carried out according to a set period as required.
The temperature sensors are respectively arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump, inside the condensing box, on the first adsorption-desorption device and the second adsorption-desorption device and used for measuring the temperature of each part.
And the flowmeter is arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump and is used for measuring the flow rate of oil gas in the oil-gas inlet pipeline.
Further, still include the spark arrester, the spark arrester sets up on the oil gas pipeline between underground oil tank and bleed pump and inhales the pipeline of desorption device export for prevent outside flame to get into the system pipeline.
The device further comprises a sledge body, wherein the sledge body is used for installing an air guide pump, a condensing box, a refrigerating unit, a recovery tank, an absorption and desorption device, a vacuum pump and an oil-gas pipeline; the skid body comprises a skid body pipeline interface, and the skid body pipeline interface comprises an oil gas inlet, an oil return outlet and an exhaust gas outlet;
the oil gas import and the gaseous phase pipeline UNICOM of underground oil tank, oil return export and underground oil tank UNICOM, the exhaust gas export and atmosphere UNICOM.
The invention has the advantages over the prior art that:
1. the investment is small, the cost is low, and the market popularization and application value is high; through measurement and calculation, the cost of the system of the invention is reduced by 20 percent compared with the similar system in the prior art;
2. the operation energy consumption is low, the resources are saved, and the operation cost is low;
3. the device has few parts and equipment, is beneficial to maintenance and repair and is easy to operate;
4. emergency interlocking parking protection is provided for the conditions of over-temperature, over-pressure and the like in the system operation process;
5. the condensing tank and the recovery tank are separately arranged, so that the problems that the liquid level of liquid oil in the condensing tank is difficult to control, the condensed liquid oil is easily absorbed by steam in the condenser again and the like are effectively solved;
6. the condensed liquid oil is discharged into a recovery tank for cooling before entering an underground oil tank, so that the temperature difference with the environment can be reduced, the condensation and freezing blockage of pipelines and valves can be reduced, and the device can continuously and stably operate; if the failure rate is greatly reduced, the maintenance probability is reduced, and the service life of the system is prolonged; the production efficiency is also obviously improved.
7. The working temperature of the condensing box is controlled between minus 25 ℃ and minus 15 ℃, more than 90% of oil gas can be cooled and liquefied in the temperature range, the frequent start and stop of a refrigerating unit are avoided, and the comprehensive energy consumption is reduced by more than half.
8. The system comprises the flame arrester, and the system has good safety.
9. The system comprises a filter, so that dust in the suction and desorption device is prevented from entering the vacuum pump, the operation is guaranteed, the failure rate is low, and the production efficiency is high.
Drawings
FIG. 1 is a schematic view of a tertiary oil and gas recovery system of the present invention.
Wherein: 1-underground oil tank, 2-induced air pump, 3-condensing box, 32-oil gas inlet, 36-return oil outlet, 4-recovery tank, 5-discharge valve, 6-refrigerating unit, 7-vacuum pump, 8-first adsorption-desorption device, 9-second adsorption-desorption device and 10-discharge gas outlet.
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 tertiary oil-gas recovery system of the present invention is characterized by comprising an air-introducing pump, a condensing tank, a refrigerating unit and a recovery tank; the air-entraining pump is arranged between the underground oil tank and the condensing tank and is used for pumping oil gas in the underground oil tank into the condensing tank; the condensing box is a heat exchange place of oil gas and a refrigerant and is used for cooling and liquefying the oil gas, the condensing box is of a sealing structure, and the condensing box is provided with an oil gas inlet, an oil gas outlet and an oil liquid outlet; the refrigerating unit provides cold energy for the condensing box; one end of the recovery tank is connected with an oil outlet of the condensing tank through a pipeline and is used for storing cooled and liquefied oil, and the other end of the recovery tank is communicated with the underground oil tank through a pipeline;
also comprises an absorption and desorption device which is provided with a plurality of absorption and desorption devices,
the oil-gas inlet end of the adsorption and desorption device is communicated with the oil-gas outlet end of the condensing box through an oil-gas pipeline and is also communicated with the oil-gas inlet end of the condensing box; the oil gas outlet end of the adsorption and desorption device is emptied;
also comprises a vacuum pump,
the vacuum pump is arranged between the oil gas inlet end of the condensing device and the oil gas inlet end of the absorption and desorption device and is used for extracting and desorbing the absorbed oil gas in the absorption and desorption device;
also comprises a control system which is used for controlling the operation of the electric motor,
and the control system automatically controls the working conditions according to the pressure value in the underground oil tank, the liquid level value in the recovery tank and the AE-01 value of the absorption and desorption device.
The control system comprises a system start-stop module, an interlocking control module, an oil recovery module, an absorption and desorption module and a data acquisition module,
the start-stop module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump and is used for controlling the start and stop of the system according to the change of the pressure value;
the interlocking control module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump, when the pressure value is higher than a set value, the air-entraining pump is started, and when the pressure value is lower than the set value, the air-entraining pump is stopped;
the oil liquid recovery module comprises a liquid level sensor arranged on the recovery tank, the oil liquid is controlled to flow back to the underground oil tank according to the change of the liquid level value in the recovery tank, and when the liquid level reaches a set value, the discharge valve is opened, and the liquid gasoline flows back to the underground gasoline storage tank;
the adsorption and desorption module comprises a gas concentration detector arranged at the outlet of the adsorption and desorption device, and is used for controlling the adsorption of oil gas or the desorption of oil gas according to the change of AE-01 value in the adsorption and desorption device, when the detection value AE-01 is higher than a set value, the bleed air pump is stopped, and the adsorption and desorption process is switched from adsorption to desorption to start the desorption process; the device also comprises a temperature sensor on the adsorption and desorption device, when the temperature value is higher than a set value, the air-entraining pump stops, and the adsorption and desorption process is switched from adsorption to desorption to start the desorption process;
when the detection value AE-01 is higher than a set value, the adsorption and desorption device is used for switching to desorption when the oil gas adsorbed by the adsorption and desorption device is saturated;
the temperature set value is 50 ℃, the temperature value is 50 ℃ higher than the temperature value, the activated carbon is damaged, the deactivation is caused, if the desorption is switched, the temperature reduction process is started, the temperature in the adsorption and desorption device is ensured not to be higher than 50 ℃, and the system is protected; the actual state is difficult to reach, if the quality of the activated carbon has problems, the condition of reaching 50 ℃ can also appear, the normal operation of the system can be ensured through the control switching of the adsorption and desorption module, and the system is safe and has no fault.
The data acquisition module is used for acquiring temperature values, pressure values, liquid level values and AE-01 values.
Example 2
As shown in fig. 1, the tertiary oil-gas recovery system of the present invention is characterized by comprising an air-introducing pump, a condensing tank, a refrigerating unit and a recovery tank; the air-entraining pump is arranged between the underground oil tank and the condensing tank and is used for pumping oil gas in the underground oil tank into the condensing tank; the condensing box is a heat exchange place of oil gas and a refrigerant and is used for cooling and liquefying the oil gas, the condensing box is of a sealing structure, and the condensing box is provided with an oil gas inlet, an oil gas outlet and an oil liquid outlet; the refrigerating unit provides cold energy for the condensing box; one end of the recovery tank is connected with an oil outlet of the condensing tank through a pipeline and is used for storing cooled and liquefied oil, and the other end of the recovery tank is communicated with an underground oil tank through a pipeline;
also comprises an absorption and desorption device which is provided with a plurality of absorption and desorption devices,
the oil-gas inlet end of the adsorption and desorption device is communicated with the oil-gas outlet end of the condensing box through an oil-gas pipeline and is also communicated with the oil-gas inlet end of the condensing box; the oil gas outlet end of the adsorption and desorption device is emptied;
also comprises a vacuum pump,
the vacuum pump is arranged between the oil gas inlet end of the condensing device and the oil gas inlet end of the absorption and desorption device and is used for extracting and desorbing the absorbed oil gas in the absorption and desorption device;
and a control system is also included, wherein,
and the control system automatically controls the working conditions according to the pressure value in the underground oil tank, the liquid level value in the recovery tank and the AE-01 value of the absorption and desorption device.
The control system comprises a system start-stop module, an interlocking control module, an oil recovery module, an adsorption and desorption module and a data acquisition module,
the start-stop module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump and is used for controlling the start and stop of the system according to the change of the pressure value;
the interlocking control module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump, when the pressure value is higher than a set value, the air-entraining pump is started, and when the pressure value is lower than the set value, the air-entraining pump is stopped;
the oil liquid recovery module comprises a liquid level sensor arranged on the recovery tank, the oil liquid is controlled to flow back to the underground oil tank according to the change of the liquid level value in the recovery tank, and when the liquid level reaches a set value, the discharge valve is opened, and the liquid gasoline flows back to the underground gasoline storage tank;
the adsorption and desorption module comprises a gas concentration detector arranged at an outlet of the adsorption and desorption device, and is used for controlling adsorption of oil gas or desorption of oil gas according to the change of AE-01 value in the adsorption and desorption device, when the detection value AE-01 is higher than a set value, the air-entraining pump is stopped, and meanwhile, the adsorption and desorption process is switched from adsorption to desorption to start the desorption process; the device also comprises a temperature sensor on the adsorption and desorption device, when the temperature value is higher than a set value, the air-entraining pump stops, and the adsorption and desorption process is switched from adsorption to desorption to start the desorption process;
when the detection value AE-01 is higher than a set value, the adsorption and desorption device is used for switching to desorption when the oil gas adsorbed by the adsorption and desorption device is saturated;
the temperature set value is 50 ℃, the temperature value is 50 ℃ higher than the temperature value, the activated carbon is damaged, the deactivation is caused, if the desorption is switched, the temperature reduction process is started, the temperature in the adsorption and desorption device is ensured not to be higher than 50 ℃, and the system is protected; the real state is difficult to reach, if the quality of the activated carbon has problems, the condition of reaching 50 ℃ can also appear, the normal operation of the system can be ensured through the control switching of the adsorption and desorption module, and the system is safe and has no fault.
The data acquisition module is used for acquiring temperature values, pressure values, liquid level values and AE-01 values.
The refrigerating unit can realize double control of temperature and pressure,
specifically, the working temperature of the condensing box is controlled between-25 ℃ and-15 ℃, more than 95% of oil gas can be cooled and liquefied in the temperature range (tests and HYSYS simulation data show the effect), meanwhile, the refrigerating unit is prevented from being started and stopped frequently, and the comprehensive energy consumption is low; when the temperature value in the condensing box is higher than minus 15 ℃, the refrigerating unit is started, and when the temperature value in the condensing box is lower than minus 25 ℃, the refrigerating unit is stopped; alternatively, the refrigeration unit is started when the pressure value between the underground oil tank and the bleed air pump is higher than the highest set value (different systems correspond to different values, such as 50pa to 500pa, in this embodiment 150pa, and in the other three embodiments 50pa, 300pa and 500pa, respectively), and the refrigeration unit is stopped when the pressure value between the underground oil tank and the bleed air pump is lower than the lowest set value (0 pa).
Example 3
As shown in fig. 1, the tertiary oil-gas recovery system of the present invention is characterized by comprising an air-introducing pump, a condensing tank, a refrigerating unit and a recovery tank; the air-entraining pump is arranged between the underground oil tank and the condensing tank and is used for pumping oil gas in the underground oil tank into the condensing tank; the condensing box is a heat exchange place of oil gas and a refrigerant and is used for cooling and liquefying the oil gas, the condensing box is of a sealing structure, and the condensing box is provided with an oil gas inlet, an oil gas outlet and an oil liquid outlet; the refrigerating unit provides cold energy for the condensing box; one end of the recovery tank is connected with an oil outlet of the condensing tank through a pipeline and is used for storing cooled and liquefied oil, and the other end of the recovery tank is communicated with an underground oil tank through a pipeline;
also comprises an absorption and desorption device which is provided with a plurality of absorption and desorption devices,
the oil-gas inlet end of the adsorption and desorption device is communicated with the oil-gas outlet end of the condensing box through an oil-gas pipeline and is also communicated with the oil-gas inlet end of the condensing box; the oil gas outlet end of the adsorption and desorption device is emptied;
also comprises a vacuum pump,
the vacuum pump is arranged between the oil gas inlet end of the condensing device and the oil gas inlet end of the absorption and desorption device and is used for extracting and desorbing the absorbed oil gas in the absorption and desorption device;
and a control system is also included, wherein,
and the control system automatically controls the working conditions according to the pressure value in the underground oil tank, the liquid level value in the recovery tank and the AE-01 value of the absorption and desorption device.
The control system comprises a system start-stop module, an interlocking control module, an oil recovery module, an absorption and desorption module and a data acquisition module,
the start-stop module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump and is used for controlling the start and stop of the system according to the change of the pressure value;
the interlocking control module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump, when the pressure value is higher than a set value, the air-entraining pump is started, and when the pressure value is lower than the set value, the air-entraining pump is stopped;
the oil liquid recovery module comprises a liquid level sensor arranged on the recovery tank, the oil liquid is controlled to flow back to the underground oil tank according to the change of the liquid level value in the recovery tank, and when the liquid level reaches a set value, the discharge valve is opened, and the liquid gasoline flows back to the underground gasoline storage tank;
the adsorption and desorption module comprises a gas concentration detector arranged at an outlet of the adsorption and desorption device, and is used for controlling adsorption of oil gas or desorption of oil gas according to the change of AE-01 value in the adsorption and desorption device, when the detection value AE-01 is higher than a set value, the air-entraining pump is stopped, and meanwhile, the adsorption and desorption process is switched from adsorption to desorption to start the desorption process; the device also comprises a temperature sensor on the adsorption and desorption device, when the temperature value is higher than a set value, the air-entraining pump stops, and the adsorption and desorption process is switched from adsorption to desorption to start the desorption process;
when the detection value AE-01 is higher than a set value, the adsorption and desorption device is used for switching to desorption when the oil gas adsorbed by the adsorption and desorption device is saturated;
the temperature set value is 50 ℃, the temperature value is 50 ℃ higher than the temperature value, the activated carbon is damaged, the deactivation is caused, if the desorption is switched, the temperature reduction process is started, the temperature in the adsorption and desorption device is ensured not to be higher than 50 ℃, and the system is protected; the real state is difficult to reach, if the quality of the activated carbon has problems, the condition of reaching 50 ℃ can also appear, the normal operation of the system can be ensured through the control switching of the adsorption and desorption module, and the system is safe and has no fault.
The data acquisition module is used for acquiring temperature values, pressure values, liquid level values and AE-01 values.
The refrigerating unit can realize double control of temperature and pressure,
specifically, the working temperature of the condensing box is controlled between minus 25 ℃ and minus 15 ℃, more than 90% of oil gas can be cooled and liquefied in the temperature range, and meanwhile, the refrigerating unit is prevented from being started and stopped frequently, so that the comprehensive energy consumption is low; when the temperature value in the condensing box is higher than minus 15 ℃, the refrigerating unit is started, and when the temperature value in the condensing box is lower than minus 25 ℃, the refrigerating unit is stopped; alternatively, the refrigeration unit is started when the pressure value between the underground oil tank and the bleed air pump is higher than the highest set value (different systems correspond to different values, for example, 50pa to 500pa, 50pa in this embodiment, and 300pa and 500pa in the other three embodiments respectively), and the refrigeration unit is stopped when the pressure value between the underground oil tank and the bleed air pump is lower than the lowest set value (0 pa).
The adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device which are connected in parallel, and both the first adsorption and desorption device and the second adsorption and desorption device are activated carbon adsorption and desorption devices;
during adsorption, the condensed lean oil air enters an adsorption tank, and the separation of light hydrocarbon and air is realized by adsorbing the light hydrocarbon component in oil gas through the activated carbon by utilizing the difference of the affinity of the activated carbon with the air and the light hydrocarbon component in the oil gas;
during desorption, the light hydrocarbon components adsorbed in the activated carbon are subjected to vacuum desorption by using a vacuum pump to form high-concentration oil gas which is intensively conveyed to the front of the condensing box. The desorbed adsorbent recovers the original function and can adsorb the oil gas again;
the first adsorption-desorption device and the second adsorption-desorption device are automatically switched to be used when adsorbing and desorbing oil gas, the adsorption-desorption module is automatically switched to the second adsorption-desorption device to adsorb the oil gas after the AE-01 value of the oil gas outlet end of the adsorption-desorption device reaches a set value, meanwhile, the vacuum pump is started to carry out vacuum desorption on the oil gas by the first adsorption-desorption device, and the desorbed oil gas enters the oil gas inlet of the condensing box; the first adsorption-desorption device and the second adsorption-desorption device are alternately used, and the switching of adsorption/desorption is carried out according to a set period as required. The switching period of adsorption/desorption was 12 h/time.
The temperature sensors are respectively arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump, inside the condensing box, on the first adsorption-desorption device and the second adsorption-desorption device and used for measuring the temperature of each part.
The device is characterized by further comprising a flowmeter, wherein the flowmeter is arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump and used for measuring the oil-gas flow rate in the oil-gas inlet pipeline.
The device also comprises a flame arrester, wherein the flame arrester is arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump and on a pipeline at the outlet of the adsorption and desorption device, and is used for preventing external flame from entering a system pipeline. The system has good safety.
The dust absorption and desorption device further comprises a filter, wherein the filter is arranged between the absorption and desorption device and the vacuum pump and is used for preventing dust in the absorption and desorption device from entering the vacuum pump. The operation is guaranteed, the failure rate is low, and the production efficiency is naturally high.
The device also comprises a sledge body, wherein the sledge body is used for installing an air-inducing pump, a condensing box, a refrigerating unit, a recovery tank, an absorption and desorption device, a vacuum pump and an oil-gas pipeline; the skid body comprises a skid body pipeline interface, and the skid body pipeline interface comprises an oil gas inlet, an oil return outlet and an exhaust gas outlet;
the oil gas import and the gaseous phase pipeline UNICOM of underground oil tank, oil return export and underground oil tank UNICOM, the exhaust gas export and atmosphere UNICOM.
The process flow of the embodiment is briefly described as follows:
when the pressure PT-01 of the underground oil tank reaches a set value (+150Pa), the air-entraining pump J-101 starts to operate, oil gas in the underground oil tank is pumped into the condenser ET-101, and the oil gas is cooled to-15 to-25 ℃. At this time, most of the oil gas (more than 90% of the hydrocarbons) is converted into liquid gasoline, the liquid gasoline enters the recovery tank V-103, and the rest of the lean air enters the adsorption tank (the initial default adsorption tank V-101).
After the lean air passes through the activated carbon bed layer, 99% of hydrocarbons are absorbed, and the clean air is discharged from a discharge port at the upper part of the adsorption tank. With continuous adsorption, the activated carbon begins to saturate when AE-01 reaches 8mg/m3And when the adsorption tanks are automatically switched, the adsorption tank V-102 starts to adsorb the oil gas. And simultaneously, starting a vacuum pump J-102 to perform vacuum desorption on the adsorption tank V-101. The desorption time is set to be 20-25 min, and desorbed oil gas enters a front pipeline of the condensing box. After the desorption is finished, the SDV-01 is opened, the adsorption tank V-101 slowly releases the negative pressure state, the normal state is recovered, the standby working state is entered, and then the SDV-01 is closed. So, realize the automatic switch-over and the automatic desorption process of adsorption tanks. When the pressure of the oil tank reaches-50 Pa, the air induction pump J-101 automatically stops entering a standby state.
The control system of the system disclosed by the invention adopts a Siemens 200SMART type PLC control system to realize control. The control system consists of field instrument valves, an explosion-proof electrical control cabinet, a control room remote display/control box, cables and other electrical accessories. The flowmeter adopts a serial port communication mode, other pressure, temperature and gas concentration instruments adopt 4-20mA current signal communication modes, and the PLC is communicated with the man-machine display screen through a network port. The explosion-proof electrical control cabinet is arranged on the sledge body, and functions of instrument signal acquisition, valve control, display screen communication, remote data transmission and the like are achieved. Power distribution and a man-machine display screen are integrated in a control room remote display/control box, the parameter state, alarm information and operation records of the instrument valve are displayed in a centralized mode, and other functions such as man-machine automatic start-stop control and emergency chain parking are achieved. The remote control box can be selectively placed in a gas station operation room or integrally installed in an explosion-proof electrical control cabinet according to actual requirements.
The system of the invention has the following characteristics:
1) the emission index meets the design requirement
The purpose of the oil gas discharge treatment device arranged in the gas station is to recover volatile oil gas in the oil tank and reduce the discharge of VOCs, and the specific index for detecting whether the oil gas discharge treatment device meets the requirement is the concentration of non-methane total hydrocarbon discharged into the atmosphere after passing through the oil gas discharge treatment device. The device requires that the emission concentration of non-methane total hydrocarbon is not more than 10g/m3。
The system adopts a condensation and activated carbon adsorption process, the condensation temperature is-15 to-25 ℃, more than 95 percent of oil gas can be condensed, lean oil air passes through the activated carbon adsorption tank, and the separation of light hydrocarbon and air is realized by utilizing the different affinities of the activated carbon and the air and light hydrocarbon components in the oil gas and absorbing the light hydrocarbon components in the oil gas through the activated carbon. A concentration detector (the sensitivity is 1ppm) is arranged at the outlet of the device, and the discharge concentration of the device reaches 8g/m3The adsorption tanks are switched to ensure that the concentration of the discharged gas reaches the standard stably.
2) Stability of operation
The oil gas emission treatment device is arranged on the ground near a fuel tank area of a gas station, automatic control is realized during operation, the operation of personnel on duty is not needed, and a high-stability and high-intelligence system is required by the device.
The system of the invention is in a standby state for 24 hours, when the gas pressure in the oil tank exceeds a set value (150Pa), the bleed air pump is automatically started, the oil tank overpressure oil gas is discharged after being processed by the device, and the bleed air pump is automatically closed when the oil tank pressure is reduced to the set value (-50 Pa). The refrigerating unit adopts temperature and pressure dual control, can realize automatic start and stop, and keeps the temperature of the condensing box between 15 ℃ below zero and 25 ℃ below zero. The switching of the adsorption tanks is provided with concentration interlocking control of the concentration detector, and automatic switching can be realized. When the device is over-pressure, over-temperature, and the concentration of tail gas exceeds standard and fails, the automatic alarm interlocking shutdown can be realized. The system of the invention can realize unattended automatic operation.
3) Convenient to install
Most of the oil and gas emission treatment devices are installed and transformed in the existing operating gas stations, and customers hope that the influence of the transformation work on the operation of the gas stations is reduced as much as possible, so that the devices are required to be small in size, convenient to transport and quick to install.
The device is highly integrated in the engineering design stage, the size of equipment is controlled, an interface is reserved, and the oil gas inlet, the discharge outlet and the oil gas return port are only required to be connected on site, so that the field workload is very small.
Claims (8)
1. A tertiary oil gas recovery system is characterized by comprising an air guide pump, a condensation box, a refrigerating unit and a recovery tank; the air-entraining pump is arranged between the underground oil tank and the condensing tank and is used for pumping oil gas in the underground oil tank into the condensing tank; the condensing box is a heat exchange place of oil gas and a refrigerant and is used for cooling and liquefying the oil gas, the condensing box is of a sealing structure, and the condensing box is provided with an oil gas inlet, an oil gas outlet and an oil liquid outlet; the refrigerating unit provides cold energy for the condensing box; one end of the recovery tank is connected with an oil outlet of the condensing tank through a pipeline and is used for storing cooled and liquefied oil, and the other end of the recovery tank is communicated with an underground oil tank through a pipeline;
also comprises an adsorption-desorption device, a desorption device,
the oil-gas inlet end of the adsorption and desorption device is communicated with the oil-gas outlet end of the condensing box through an oil-gas pipeline and is also communicated with the oil-gas inlet end of the condensing box; the oil gas outlet end of the adsorption and desorption device is emptied;
also comprises a vacuum pump,
the vacuum pump is arranged between the oil gas inlet end of the condensing box and the oil gas inlet end of the absorption and desorption device and is used for extracting and desorbing the absorbed oil gas in the absorption and desorption device;
and a control system is also included, wherein,
and the control system automatically controls the working conditions according to the pressure value in the underground oil tank, the liquid level value in the recovery tank and the AE-01 value of the absorption and desorption device.
2. The tertiary oil and gas recovery system of claim 1, wherein: the control system comprises a system start-stop module, an interlocking control module, an oil recovery module, an absorption and desorption module and a data acquisition module,
the start-stop module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump and is used for controlling the start and stop of the system according to the change of the pressure value;
the interlocking control module comprises a pressure sensor arranged between the underground oil tank and the air-entraining pump; the device also comprises a temperature sensor arranged on the adsorption and desorption device; the device also comprises a gas concentration detector arranged on the adsorption and desorption device;
the oil liquid recovery module comprises a liquid level sensor arranged on a recovery tank;
the adsorption and desorption module comprises a gas concentration detector arranged at an outlet of the adsorption and desorption device; the device also comprises a temperature sensor on the adsorption and desorption device;
the data acquisition module is used for acquiring temperature values, pressure values, liquid level values and AE-01 values.
3. The tertiary oil and gas recovery system of claim 1, wherein: the adsorption and desorption device comprises a first adsorption and desorption device and a second adsorption and desorption device which are connected together in parallel, and the first adsorption and desorption device and the second adsorption and desorption device are both activated carbon adsorption and desorption devices.
4. The tertiary oil and gas recovery system of claim 1, wherein: the temperature sensors are respectively arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump, inside the condensing box, on the first adsorption-desorption device and the second adsorption-desorption device and used for measuring the temperature of each part.
5. The tertiary oil and gas recovery system of claim 1, wherein: the device is characterized by further comprising a flowmeter, wherein the flowmeter is arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump and used for measuring the oil-gas flow rate in the oil-gas inlet pipeline.
6. The tertiary oil and gas recovery system of claim 1, wherein: the device also comprises a flame arrester, wherein the flame arrester is arranged on an oil-gas pipeline between the underground oil tank and the air-entraining pump and on a pipeline at the outlet of the adsorption and desorption device, and is used for preventing external flame from entering a system pipeline.
7. The tertiary oil and gas recovery system of claim 1, wherein: the dust absorption and desorption device further comprises a filter, wherein the filter is arranged between the absorption and desorption device and the vacuum pump and is used for preventing dust in the absorption and desorption device from entering the vacuum pump.
8. The tertiary oil and gas recovery system of claim 1, wherein: the device also comprises a sledge body, wherein the sledge body is used for installing an air-inducing pump, a condensing box, a refrigerating unit, a recovery tank, an absorption and desorption device, a vacuum pump and an oil-gas pipeline; the skid body comprises a skid body pipeline interface, and the skid body pipeline interface comprises an oil gas inlet, an oil return outlet and an exhaust gas outlet;
the oil gas import and the gaseous phase pipeline UNICOM of underground oil tank, oil return export and underground oil tank UNICOM, the exhaust gas export and atmosphere UNICOM.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115779625A (en) * | 2022-12-29 | 2023-03-14 | 珠海经济特区华南联合石油有限公司 | Oil gas recovery system and oil gas recovery method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115779625A (en) * | 2022-12-29 | 2023-03-14 | 珠海经济特区华南联合石油有限公司 | Oil gas recovery system and oil gas recovery method thereof |
| CN115779625B (en) * | 2022-12-29 | 2024-02-13 | 珠海经济特区华南联合石油有限公司 | Oil gas recovery system and oil gas recovery method thereof |
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