CN218248601U - Oil gas recovery system of filling station - Google Patents
Oil gas recovery system of filling station Download PDFInfo
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- CN218248601U CN218248601U CN202222522248.7U CN202222522248U CN218248601U CN 218248601 U CN218248601 U CN 218248601U CN 202222522248 U CN202222522248 U CN 202222522248U CN 218248601 U CN218248601 U CN 218248601U
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Abstract
The utility model discloses a gas station oil gas recovery system, which comprises a first condenser, a second condenser, a compressor, a vortex tube, a heat exchanger, a circulating fan, an adsorption tower and an oil gas storage tank, wherein the adsorption tower is also connected with a vacuum pump and a nitrogen tank; the vortex tube comprises a cold end and a hot end, the cold end can provide cold energy for the first condenser and the second condenser to condense oil gas to be recovered, and the hot end can provide heat for the heat exchanger to be desorbed and regenerated by the adsorption tower and also can provide heat for defrosting of the first condenser and the second condenser. The oil gas recovery system is simple in structure, convenient to operate, high in oil gas recovery rate of a gas station, economical, practical, safe and environment-friendly.
Description
Technical Field
The utility model relates to an oil gas recovery device, especially a gas station's vapor recovery system.
Background
Gasoline is a light oil product which is very volatile, and oil gas is generated in the processes of storage, loading and unloading, transportation and retail. The oil gas dissipated to the atmosphere is volatilized, so that the damage to surrounding residents is caused, the surrounding environment is polluted, and the potential danger of fire and explosion accidents exists.
The oil gas of the gas station is mainly generated in the process of collecting the oil gas into an underground oil tank through a pipeline in closed connection when gasoline is added to the motor vehicle.
The evaporation loss of the gasoline is 1.44Kg when 1 cubic meter of gasoline is added in a common gasoline station, and the gasoline pollution and the oil loss can be reduced by utilizing the oil gas recovery equipment, so that the installation of the oil gas recovery device in the gasoline station can give consideration to the double effects of environmental protection and economy.
At present, oil gas recovery equipment mainly comprises four types, namely a membrane type condensation method oil gas recovery device, a membrane method oil gas recovery device, a condensation adsorption method oil gas recovery device and a pressure swing adsorption method oil gas recovery device, but has some problems in the actual operation process.
The membrane condensation method oil gas recovery device compresses oil gas, utilizes a fan to cool, recovers a part of oil gas, then separates through a membrane separator, the concentrated oil gas returns to an oil gas storage tank, and the filtered gas containing a small amount of oil gas is discharged into the atmosphere. Because oil gas is very high through compressor compression back temperature, hardly with the fan cooling to normal atmospheric temperature, get back to in the oil gas storage tank as high temperature oil gas, can spread rapidly and promote the evaporation of oil in the oil gas storage tank, lead to the oil gas volume to increase additionally, and the oil gas volume of cooling liquefaction is very little, economic benefits is poor.
The membrane method oil gas recovery device is characterized in that oil gas firstly permeates a membrane, and returns to an oil gas storage tank after being enriched and compressed on the permeation side of the membrane, tail gas after oil gas removal is discharged into the atmosphere, and concentrated oil gas is higher than the temperature of oil in the oil gas storage tank due to the temperature in the compression process, so that additional evaporation of the oil in the oil gas storage tank can be caused, and the operation effect is poor.
The oil gas recovery device by the condensation adsorption method is characterized in that after a part of oil gas is recovered by condensing the oil gas through a refrigerator, the rest oil gas is adsorbed by an adsorption tank and then is discharged into the atmosphere. The activated carbon is required to be replaced by new activated carbon after oil gas adsorption saturation, and the activated carbon is regenerated.
The pressure swing adsorption method oil gas recovery device firstly discharges oil gas after being adsorbed by an adsorbent, vacuum desorption is carried out after the adsorbent is saturated, the pressure swing adsorption device causes the adsorbent to be quickly saturated due to incomplete desorption, the adsorption function is lost, and the discharge can not reach the national standard.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned among the prior art not enough, provide a novel oil gas recovery system of filling station, simple installation, economical and practical, safety ring guarantor.
The technical scheme of the utility model elaborates as follows:
a gas station oil gas recovery system comprises a first condenser (1), a second condenser (2), a compressor (9), a vortex tube (10), a heat exchanger (5), a circulating fan (6), an adsorption tower and an oil gas storage tank (8); wherein the content of the first and second substances,
the first condenser (1) is used for receiving oil gas and precooling the oil gas, and the first condenser (1) is connected with the second condenser (2) so that the precooled oil gas is further subjected to deep cooling in the second condenser (2); the second condenser (2) is connected with the vortex tube (10) to receive cold energy provided by the vortex tube (10), and the second condenser (2) is also connected with the adsorption tower through a pipeline and is used for sending cryogenic oil gas into the adsorption tower;
the compressor (9) is connected with the vortex tube (10) to provide compressed gas for the vortex tube (10), the vortex tube (10) comprises a cold end and a hot end, the cold end is connected with the second condenser (2) and used for providing cold for the second condenser (2), and the hot end is connected with the heat exchanger (5) and used for providing heat for the heat exchanger (5);
the heat exchanger (5) is connected with the hot end of the vortex tube (10) and used for receiving heat provided by the hot end; the heat exchanger (5) is also connected with the adsorption tower and used for heating the gas passing through the adsorption tower; the heat exchanger (5) is also connected with a circulating fan (6) through a pipeline to provide gas heated by the heat exchanger for the circulating fan (6); the circulating fan (6) is also connected with the adsorption tower and is used for feeding the heated gas into the adsorption tower;
the adsorption tower is internally provided with an adsorbent and is also connected with a vacuum pump (7) for pumping gas in the adsorption tower and a nitrogen tank (11) for filling nitrogen into the adsorption tower; the adsorption tower is connected with a heat exchanger (5) through a pipeline to send discharged gas to the heat exchanger (5) for heating;
the first condenser (1), the second condenser (2), the adsorption tower and the vacuum pump (7) are all connected with an oil gas storage tank (8) through pipelines.
As an alternative or preferred solution, the above-mentioned gasoline station vapor recovery system,
the first condenser (1) comprises an oil-gas precooling shell, a first refrigerant pipe and a first defrosting pipe, wherein the oil-gas precooling shell can exchange heat with each other, an air inlet of the oil-gas precooling shell is connected with an oil-gas recovery pipe, and an air outlet of the oil-gas precooling shell is connected with an air inlet of an oil-gas deep cooling shell of the second condenser (2); the air inlet of the first refrigerant pipe is connected with the air outlet of the oil-gas deep cooling shell, the air inlet of the first defrosting pipe is connected with the air outlet of the second defrosting pipe, the air outlet of the first defrosting pipe is connected with the air inlet of the compressor (9) to provide an air source for the compressor, and the air outlet of the first refrigerant pipe is connected with the air inlet of the adsorption tower;
the second condenser (2) comprises an oil gas cryogenic shell, a second refrigerant pipe and a second defrosting pipe, wherein the oil gas cryogenic shell can exchange heat with each other, an air inlet of the oil gas cryogenic shell is connected with an air outlet of the oil gas precooling shell, and an air outlet of the oil gas cryogenic shell is connected with an air inlet of the first refrigerant pipe of the first condenser (1); the air inlet of the second refrigerant pipe is connected with the cold end of the vortex pipe (10), and the air outlet of the second refrigerant pipe is connected with the air inlet of the compressor (9) to provide an air source for the compressor (9); and the air inlet of the second defrosting pipe is connected with the hot end of the vortex pipe (10), and the air outlet of the second defrosting pipe is connected with the air inlet of the first defrosting pipe.
As an alternative or preferred solution, the above-mentioned gasoline station vapor recovery system,
the gas outlet of the first defrosting pipe is connected with the gas inlet of the compressor (9) through a pipeline provided with an eighteenth control valve (SV 18), the gas outlet of the second refrigerant pipe is connected with the gas inlet of the compressor (9) through a pipeline provided with a seventeenth control valve (SV 17), and the gas outlet of the first refrigerant pipe is connected with the gas inlet of the adsorption tower through a pipeline provided with a first control valve (SV 1).
Alternatively, or preferably, the gasoline station hydrocarbon recovery system of any of the above,
the vortex tube (10) comprises a vortex chamber, the two ends of the vortex chamber are respectively a cold end and a hot end, and an air inlet of the vortex chamber is connected with an air outlet of the compressor (9); the cold end is connected with the air inlet of the second refrigerant pipe through a pipeline provided with a fifteenth control valve (SV 15); the hot end is connected with a heat exchange tube of the heat exchanger (5) through a pipeline;
the heat exchanger (5) comprises a heat exchange tube and a heat exchanger shell which can exchange heat with each other, an air inlet of the heat exchange tube is connected with the hot end, and an air outlet of the heat exchange tube is connected with an air inlet of the compressor (9) to provide a circulating air inlet source for the compressor (9); the air inlet of the heat exchanger shell is connected with the adsorption tower and used for receiving gas discharged from the adsorption tower, and the air outlet of the heat exchanger shell is connected with the air inlet of the circulating fan (6);
and the air inlet of the circulating fan (6) is connected with the air outlet of the heat exchanger shell, and the air outlet of the circulating fan (6) is connected with the adsorption tower.
As an alternative or preferred solution, the above-mentioned gasoline station vapor recovery system,
the hot end of the vortex tube (10) is connected with the air inlet of the second defrosting tube through a pipeline provided with a fourteenth control valve (SV 14), and the cold end of the vortex tube (10) is also connected with the air inlet of the compressor (9) through a pipeline provided with a sixteenth control valve (SV 16); the vortex tube (10) is connected with the heat exchanger (5) through a pipeline provided with a thirteenth control valve (SV 13); the first defrosting pipe is connected with an air inlet of the compressor (9) through a pipeline provided with an eighth temperature transmitter (TI-118).
As an alternative or preferred solution, the above-mentioned gasoline station vapor recovery system,
and the air outlet of the first refrigerant pipe is connected with the air inlet of the adsorption tower through a pipeline provided with a seventh temperature transmitter (TI-117).
As an alternative or preferred solution, the above-mentioned gasoline station hydrocarbon recovery system, said adsorption tower comprising a first adsorption tower (3) and a second adsorption tower (4),
the first adsorption tower (3) is connected with the second condenser (2) through a pipeline provided with a first control valve (SV 1) to receive oil gas subjected to deep cooling; the first adsorption tower (3) is also connected to an exhaust gas discharge pipe through a pipeline provided with a third control valve (SV 3);
the second adsorption tower (4) is connected with the second condenser (2) through a pipeline provided with a second control valve (SV 2) to receive the oil gas subjected to deep cooling; the second adsorption tower (4) is also connected to the exhaust gas discharge pipe through a pipeline provided with a fourth control valve (SV 4);
and an oil gas VOC analyzer is arranged on the waste gas discharge pipe.
As an alternative or preferred solution, the above-mentioned gasoline station vapor recovery system,
the first adsorption tower (3) is connected with an oil gas storage tank (8) through a pipeline provided with a first pressure transmission controller (PIC-111), is connected with a vacuum pump (7) through a pipeline provided with an eighth control valve (SV 8), and is connected with a nitrogen tank (11) through a pipeline provided with a fifth control valve (SV 5);
and the second adsorption tower (4) is connected with an oil gas storage tank (8) through a pipeline provided with a second pressure transmission controller (PIC-112), is connected with a vacuum pump (7) through a pipeline provided with a ninth control valve (SV 9), and is connected with a nitrogen tank (11) through a pipeline provided with a sixth control valve (SV 6).
As an alternative or preferred solution, the above-mentioned gasoline station vapor recovery system,
a sixth temperature transmitter (TI-116) is arranged on a pipeline connecting the heat exchanger (5) and the circulating fan (6);
the first adsorption tower (3) is connected with the heat exchanger (5) through a pipeline provided with a fourth temperature transmitter (TI-114);
the second adsorption tower (4) is connected with the heat exchanger (5) through a pipeline provided with a fifth temperature transmitter (TI-115).
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses an oil gas condensing equipment is constituteed to first condenser, second condenser, compressor and vortex tube, and oil gas is earlier about through first condenser precooling to 3 ℃ -10 ℃, and the cold junction of recycling vortex tube carries out cold volume to the second condenser and provides, can further cool off the oil gas through first condenser precooling to about-40 ℃, get off the component condensation of 90% in the oil gas and flow back to the oil gas storage tank.
Simultaneously, the system also comprises an oil gas regeneration device consisting of a vortex tube, a heat exchanger, a circulating fan, a nitrogen tank and a vacuum pump, oil gas which is subjected to deep cooling by a second condenser enters an adsorption tower to be adsorbed, after adsorption saturation, desorption is carried out by the vacuum pump firstly, the desorbed oil gas returns to an oil gas storage tank, nitrogen gas is filled into the adsorption tower after vacuum is stopped, the circulating fan is started to carry out nitrogen gas circulation among the adsorption tower, the heat exchanger and the circulating fan, the nitrogen gas is heated by hot gas discharged by the vortex tube through the heat exchanger, hot nitrogen gas is subjected to thermal desorption through an adsorbent, and the hot nitrogen gas is discharged to an oil tank through the vacuum pump after desorption is completed, so that regeneration is completed.
In addition, the system can also utilize a vortex tube to defrost, and gas at the hot end of the vortex tube can enter a partition wall of a second condenser through a pipeline to heat the second condenser, then enters a partition wall of a first condenser to heat the first condenser through heat exchange, and then enters an air inlet of a compressor to provide a circulating air inlet source for the compressor; the gas at the cold end of the vortex tube enters the air inlet of the compressor through the pipeline to provide a circulating air inlet source for the compressor, and the purpose of defrosting the first condenser and the second condenser is achieved through recycling.
The utility model discloses an oil gas recovery system equipment is simple, and cold production, heat production process security are high, do not have easily fire, explosive spark risk, can utilize the heat and the cold volume of vortex tube simultaneously ingeniously for the energy can make full use of, simple easy operation, energy utilization is high. The concentration of oil gas discharged by tail gas is lower than 1g/m when the oil gas discharged by a gas station is treated 3 The oil gas recovery rate can reach 99.8%. The oil gas recovery system of the gas station is more stable in operation, economical, practical, safe and environment-friendly, and the vortex tube has no running part and does not need maintenance.
The utility model discloses utilize the low temperature condensation oil gas that the vortex tube produced, utilize its heat regeneration adsorbent that produces high-temperature gas simultaneously, energy utilization is high, finally discharges VOC and is less than 1 gram cubic meter, far is less than national standard 25 grams cubic meter, has both reduced environmental pollution, has retrieved a large amount of petrol again. The system has the advantages that the heat and the cold generated by the system are only completed by one vortex tube, the device is simple, the problem that the conventional device needs complex equipment of a unit for heating and refrigerating by electricity when generating heat is solved, a gas station is a class A explosion-proof area, potential safety hazards can be caused by heating by electricity, the vortex tube can generate high heat and extremely low temperature instantly without electricity, and the potential safety hazards are avoided. The existing oil gas recovery device for condensation adsorption needs frequent replacement of the adsorbent due to no regeneration device, and the treatment operation on the adsorbent is complex. The pressure swing adsorption device causes the adsorbent to be saturated quickly and lose the adsorption function because of incomplete desorption, and the discharge can not reach the national standard. The system overcomes the defects of the devices, and has the advantages of high oil gas recovery rate of the gas station, lower cost, simple operation, small device investment and long service life.
Drawings
FIG. 1 is a schematic view of the overall structure of a gas recovery system of a gas station in an embodiment;
fig. 2 is a schematic structural diagram of a first condenser.
In the figure:
1-a first condenser, 2-a second condenser, 3-a first absorption tower, 4-a second absorption tower, 5-a heat exchanger, 6-a circulating fan, 7-a vacuum pump, 8-an oil gas storage tank, 9-a compressor, 10-a vortex tube, 11-a nitrogen tank, SV 1-SV 18-a first-eighteenth control valve, TI-114-TI-118-a fourth-eighth temperature transmitter, PIC-111-a first pressure transmitter controller, PIC-112-a second pressure transmitter controller and an FI-100-oil gas VOC analyzer.
Detailed Description
The technical solutions of the present invention will be explained and illustrated in detail below with reference to preferred embodiments and drawings so that those skilled in the art can better understand the present invention and implement the present invention, and the illustrated embodiments are not intended to limit the scope of the present invention.
Referring to fig. 1, a gas recovery system for a gas station includes a first condenser 1, a second condenser 2, a first adsorption tower 3, a second adsorption tower 4, a compressor 9, a vortex tube 10, a heat exchanger 5, a circulating fan 6, a vacuum pump 7, a gas storage tank 8, a vortex tube 10, and a nitrogen tank 11.
The first condenser 1 and the second condenser 2 both belong to one type of heat exchanger, and are multi-medium tube-shell heat exchangers, oil gas flows in a heat exchanger shell, different cold and hot media enter a non-communicated heat exchanger tube pass to achieve respective heat exchange, and the heat exchanger is common finished equipment on the market. The first condenser 1 and the second condenser 2 can transfer cold in the refrigerant to nearby gas to be condensed in a fast mode to convert the gas or steam to be condensed into liquid, and simultaneously can transfer heat in the heat medium to a frosted refrigerant pipeline in a fast mode during defrosting to melt the frost into liquid to drop, so that quick defrosting is achieved. The adsorption tower is internally provided with a medium for adsorbing oil gas components, such as molecular sieves and other adsorbents, and the adsorbents are conventional products. The compressor 9 is a mature product on the market, and is a driven fluid machine capable of lifting low-pressure gas into high-pressure gas. The vortex tube 10 is a mature product on the market, is a refrigeration device, generates low temperature by using compressed gas, and also generates hot gas at the same time, and generally comprises an air inlet, a vortex generation cavity, and a cold end and a hot end which are positioned at two sides of the vortex generation cavity. The heat exchanger 5 is a mature product on the market and is used for exchanging heat of media with different temperatures. The circulating fan 6 is a device which uses the rotation of an internal impeller to form negative pressure at an air inlet end to suck air and send the air out at an air outlet end, and is an existing product. The vacuum pump 7 is an apparatus for evacuating a container to be evacuated (in this embodiment, the container to be evacuated is an adsorption tower) to obtain a certain degree of vacuum in the container to be evacuated, and is a conventional product.
In this embodiment, each component is connected to a Programmable Logic Controller (PLC), and is controlled by the PLC.
The interrelationship between the components of the oil and gas recovery system is described in detail below:
the first condenser 1 comprises an oil-gas precooling shell, a first defrosting pipe and a first refrigerant pipe, wherein the oil-gas precooling shell, the first defrosting pipe and the first refrigerant pipe can exchange heat with each other.
And an air inlet of the oil gas precooling shell is connected with the oil gas recovery main pipe, receives oil gas and precools the oil gas through a refrigerant in the first refrigerant pipe. The refrigerant can be an external refrigerant, and can also be residual oil gas after condensation through the oil gas cryogenic pipe of the second condenser 2, and the residual oil gas is used as the refrigerant, so that resource utilization and cost saving are facilitated. The gas outlet of the oil gas precooling pipe is connected with the gas inlet of the oil gas deep cooling shell of the second condenser 2, and the precooled residual oil gas is conveyed to the second condenser 2 for continuous deep cooling. The oil gas precooling shell is further connected to the oil gas storage tank 8 through a pipeline and used for conveying and storing cooled oil gas to the oil gas storage tank 8.
The air inlet of the first refrigerant pipe can be connected with an external refrigerant supply end, and is preferably connected with the air outlet of the oil-gas deep cooling shell of the second condenser 2. The air outlet of the first refrigerant pipe is connected with the air inlet of the first adsorption tower 3 and the air inlet of the second adsorption tower 4 through a pipeline provided with a seventh temperature transmitter (TI-117), a first control valve SV1 is arranged on the pipeline at the air inlet end of the first adsorption tower 3, and a second control valve SV2 is arranged on the pipeline at the air inlet end of the second adsorption tower 4. The air outlet of the first defrosting pipe is connected with the air inlet of the compressor 9 through a pipeline provided with an eighth temperature transmitter (TI-118).
The second condenser 2 comprises an oil-gas deep cooling shell, a second defrosting pipe and a second refrigerant pipe which can exchange heat with each other. The air inlet of the oil gas cryogenic shell is connected with the air outlet of the oil gas precooling shell of the first condenser 1, and the air outlet of the oil gas cryogenic shell is connected with the air inlet of the first refrigerant pipe. The oil gas deep cooling shell is further connected to the oil gas storage tank 8 through a pipeline and used for conveying and storing cooled oil gas to the oil gas storage tank 8.
The air inlet of the second refrigerant pipe is connected with the cold end of the vortex pipe 10, and the air outlet of the second refrigerant pipe is connected with the air inlet of the compressor 9 through a pipeline provided with a seventeenth control valve SV 17.
And an air inlet of the compressor 9 is respectively connected with a first defrosting pipe of the first condenser 1, a second refrigerant pipe of the second condenser 2, the cold end of the vortex tube 10 and a heat exchange pipe of the heat exchanger 5 through pipelines to receive an air source from four directions. The outlet of the compressor 9 is connected to the inlet of the vortex tube 10 by a pipe to provide compressed gas to the vortex tube 10.
The air source of the vortex tube circulates in the system and is not communicated with the outside air, so that the air source is clean and dry, the cold end of the vortex tube can reach the low temperature of-40 ℃, and the air inlet temperature of the vortex tube can be ensured to be within a control range due to the heat exchange between the hot end and the outside environment, and the refrigerating capacity of the vortex tube is ensured.
The vortex tube 10 comprises a cold end and a hot end, a vortex generation cavity is arranged between the cold end and the hot end, and an air inlet is formed in the vortex generation cavity. The gas inlet is connected to the gas outlet of the compressor 9 and receives compressed gas from the compressor 9. The cold end is connected with a second refrigerant pipe air inlet of the second condenser 2 through a pipeline provided with a fifteenth control valve SV15 to provide cold energy for the second refrigerant pipe; in addition, the cold end is also connected with the air inlet of the compressor 9 through a pipeline provided with a sixteenth control valve SV 16. The hot end is connected with an air inlet of a heat exchange tube of the heat exchanger 5 through a pipeline provided with a thirteenth control valve SV13 to provide heat for the heat exchanger 5; in addition, the hot end of the condenser is connected with an air inlet of a second defrosting pipe of the second condenser 2 through a pipeline provided with a fourteenth control valve SV14, and then the hot end of the condenser is connected to a first defrosting pipe of the first condenser 1, so that heat is provided for defrosting and cooling of the first condenser 1 and the second condenser 2.
The heat exchanger 5 comprises a heat exchange tube and a heat exchanger shell which can exchange heat with each other, wherein an air inlet of the heat exchange tube is connected with a hot end through a pipeline provided with a thirteenth control valve SV13, and an air outlet of the heat exchange tube is connected with an air inlet of the compressor 9 to provide an air source for the compressor 9. And the air inlet of the heat exchanger shell is connected with the first adsorption tower 3 and the second adsorption tower 4 through a pipeline provided with a seventh control valve SV7 and used for receiving gas exhausted from the adsorption towers, and the air outlet of the second heat exchange pipe is connected with the air inlet of the circulating fan 6 through a pipeline provided with a sixth temperature transmitter TI-116.
The air inlet of the circulating fan 6 is connected with the air outlet of the heat exchanger shell of the heat exchanger 5, the air outlet of the circulating fan 6 is connected with the adsorption tower through a main pipeline, the main pipeline is connected with the first adsorption tower 3 and the second adsorption tower 4 after being branched, an eighth control valve SV8 is arranged on a branched pipeline connected with the first adsorption tower 3, and a ninth control valve SV9 is arranged on a branched pipeline connected with the second adsorption tower 4.
One end of the vacuum pump 7 is connected to a main pipeline between the circulating fan 6 and the adsorption tower through a pipeline provided with a tenth control valve SV10, and the other end of the vacuum pump 7 is connected to an oil gas storage tank 8.
The first adsorption tower 3 is provided with an air inlet for inputting residual condensed oil gas and is connected with an air outlet of a first refrigerant pipe of the first condenser 1 through a pipeline provided with a first control valve SV 1; an air inlet for supplying air to the circulating fan 6 or sucking air to the vacuum pump is connected with the vacuum pump 7 and the circulating fan 6 through a pipeline provided with an eighth control valve SV 8; the gas outlet for discharging the waste gas is connected to a waste gas discharge pipe by a pipeline provided with a third control valve SV3, and the waste gas discharge pipe is provided with an oil gas VOC analyzer FC-100; the gas outlet is used for discharging oil gas and is connected to the heat exchanger 5 through a pipeline provided with a fifth control valve SV 5; the regeneration circulation line (i.e., the line provided with the fifth control valve SV5 connectable to the gas outlet from which oil and gas are discharged) is also connected to a nitrogen tank 11 through a line provided with an eleventh control valve SV11. The first adsorption tower 3 is also connected with an oil gas storage tank 8 through a pipeline provided with a first pressure transmission controller PIC-111.
The second adsorption tower 4 is provided with an air inlet for inputting residual condensed oil gas and is connected with an air outlet of a first refrigerant pipe of the first condenser 1 through a pipeline provided with a second control valve SV 2; the air inlet for air supply of the circulating fan 6 or air suction of the vacuum pump is connected with the vacuum pump 7 and the circulating fan 6 through a pipeline provided with a ninth control valve SV 9; the gas outlet for discharging the waste gas is connected to a waste gas discharge pipe by a pipeline provided with a fourth control valve SV 4; the gas outlet is used for discharging oil gas and is connected to the heat exchanger 5 through a pipeline provided with a sixth control valve SV 6; the regeneration circulation line (i.e., the line provided with the sixth control valve SV6 connectable to the gas outlet from which oil and gas are discharged) is also connected to a nitrogen tank 11 through a line provided with an eleventh control valve SV11. The second adsorption tower 4 is also connected with the oil gas storage tank 8 through a pipeline provided with a second pressure transmission controller PIC-112.
The oil gas recovery system of the gas station has the working principle that:
and (3) recovering condensed oil gas: when the fuel charger is used for filling fuel to motor vehicles, the oil gas enters the oil gas recovery main pipe. The compressor 9 is started to convey compressed gas to the vortex tube 10, hot end gas of the vortex tube 10 enters the heat exchanger 5 through a pipeline provided with a thirteenth control valve SV13 to perform partition wall heat exchange to circulate regenerated gas, and cold end gas of the vortex tube 10 enters a second refrigerant tube of the second heat exchanger 2 through a fifteenth control valve SV15 to perform partition wall heat exchange. In the process, oil gas in the oil gas recovery main pipe is precooled and cooled to about 3-10 ℃ through an oil gas precooling shell of a first condenser 1 of the system, moisture and high-boiling-point oil gas components in the oil gas are condensed, condensate is conveyed to an oil gas storage tank 8 through a pipeline, residual oil gas is continuously conveyed to an oil gas deep cooling shell of a second condenser 2, the oil gas is cooled to about-40 ℃ by deep cooling gas generated by a vortex tube 10, and 90% of components in the oil gas are condensed and conveyed to the oil gas storage tank 8 through the pipeline. The residual oil gas after the deep cooling condensation enters a first refrigerant pipe of the first condenser 1 as a refrigerant to exchange heat with the oil gas to be condensed in the oil gas precooling shell, and then enters the first adsorption tower 3 or the second adsorption tower 4.
The residual oil gas from the first condenser 1 enters a first adsorption tower 3 through a pipeline provided with a first control valve SV1 (at the moment, a second control valve SV2 is closed), light components in the oil gas in the first adsorption tower 1 are adsorbed by an adsorption molecular sieve (an existing oil gas adsorbent) in the first adsorption tower 1, and the adsorbed waste oil gas enters a waste gas discharge pipe through a pipeline provided with a third control valve SV3 (at the moment, a fourth control valve SV4 is closed) to be discharged to the atmosphere. An oil gas VOC analyzer FC-100 is arranged on a waste gas discharge pipe to implement on-line detection, if the discharged tail gas exceeds the standard, a signal is transmitted to a PLC controller to control opening of a second control valve SV2 and closing of a first control valve SV1, the residual oil gas from a first condenser 1 enters a second adsorption tower 4 through a pipeline provided with the second control valve SV2 to be adsorbed by a molecular sieve, the adsorbed waste oil gas enters the waste gas discharge pipe through a pipeline provided with a fourth control valve SV4 (at the moment, a third control valve SV3 is closed) to be discharged to the atmosphere, on-line detection is implemented according to the oil gas VOC analyzer FC-100 arranged on the waste gas discharge pipe to perform adsorption tower switching, and qualified discharge is ensured.
And (3) regenerating the adsorption tower after adsorption saturation: firstly, vacuum desorption is carried out on the adsorption tower through a vacuum pump 7, desorbed oil gas returns to an oil gas storage tank 8, the vacuum pump is stopped, nitrogen is filled into the adsorption tower through a nitrogen tank 11, a circulating fan 6 is started to carry out nitrogen circulation, the nitrogen is heated by hot gas discharged by a vortex tube 10 through a heat exchanger 5, hot nitrogen is subjected to thermal desorption through an adsorbent, and the desorbed oil gas is discharged to the oil gas storage tank 8 through the vacuum pump.
The details are as follows:
when the first adsorption tower 1 is saturated with adsorbed oil gas (the oil gas VOC analyzer FC-100 communicated with the first adsorption tower detects that the discharged waste oil gas exceeds the standard), the PLC control system automatically regenerates the first adsorption tower 1. First, the eighth control valve SV8 and the tenth control valve SV10 are opened, while the third control valve SV3, the first control valve SV1, the fifth control valve SV5, the seventh control valve SV7, the ninth control valve SV9, the eleventh control valve SV11, the twelfth control valve SV12, and the thirteenth control valve SV13 are closed. And starting the vacuum pump 7, and keeping the vacuum for 20 minutes when the pressure of the first pressure transmission controller PIC-111 on the connecting pipeline of the first adsorption tower 3 and the oil gas storage tank 8 reaches a set value of-0.99. The tenth control valve SV10 is then closed, and the vacuum pump 7 is stopped. The fifth control valve SV5 and the seventh control valve SV7 are opened, while closing of the third control valve SV3, the first control valve SV1, the sixth control valve SV6, the ninth control valve SV9, and the thirteenth control valve SV13 is confirmed, the eleventh control valve SV11 is opened to charge nitrogen gas into the first adsorption tower 1, and the eleventh control valve SV11 is closed when the pressure of the first pressure transmission controller PIC-111 reaches the set value of 0.00001. And starting the circulating fan 6 to carry out regeneration treatment, wherein the desorbed oil gas containing nitrogen in the first adsorption tower 3 sequentially passes through the heat exchanger 5 and the circulating fan 6 in the regeneration process and then returns to the first adsorption tower 3.
If the first pressure transmission controller PIC-111 exceeds the set value of 0.001 in the regeneration process, the twelfth control valve SV12 is automatically opened to exhaust gas from the gasoline storage tank 8, and when the first pressure transmission controller PIC-111 reaches the set value of 0.00001, the twelfth control valve SV12 is automatically closed. And when the difference between the values of the fourth temperature transmitter TI-114 and the sixth temperature transmitter TI-116 is less than 1-4 ℃, the circulation is kept for 30 minutes, and the circulating fan 6 is stopped. Then the tenth control valve SV10 is opened, the vacuum pump 7 is turned on, the vacuum is maintained for 20 minutes when the pressure of the first pressure transmission controller PIC111 reaches the set value-0.99, and then the tenth control valve SV10 is closed, and the vacuum pump 7 is stopped. And the eleventh control valve SV11 is opened again to charge nitrogen to the set value of the first pressure transmission controller PIC-111 of 0.00001, the eleventh control valve SV11 is closed, and the regeneration of the first adsorption tower 1 is finished.
When the second adsorption tower 2 is saturated with adsorbed oil gas (the oil gas VOC analyzer communicated with the first adsorption tower detects that the discharged waste oil gas exceeds the standard), the PLC control system automatically regenerates the second adsorption tower 2.
When the regeneration treatment is performed, the ninth control valve SV9 and the tenth control valve SV10 are first opened, the fourth control valve SV4, the second control valve SV2, the sixth control valve SV6, the seventh control valve SV7, the eighth control valve SV8, the eleventh control valve SV11, the twelfth control valve SV12 and the thirteenth control valve SV13 are simultaneously closed, the vacuum pump 7 is started, the vacuum is maintained for 20 minutes when the pressure of the second pressure transmission controller PIC-112 on the pipeline connecting the second adsorption tower 4 and the oil and gas storage tank 8 reaches a set value of-0.99, then the tenth control valve SV10 is closed, and the vacuum pump 7 is stopped. And opening a sixth control valve SV6 and a seventh control valve SV7, closing a fourth control valve SV4, a second control valve SV2, a fifth control valve SV5 and an eighth control valve SV8 at the same time, opening an eleventh control valve SV11, filling nitrogen gas until the pressure of a second pressure transmission controller PIC-112 reaches a set value of 0.00001, closing the eleventh control valve SV11, starting a circulating fan 6, performing regeneration treatment, and returning the desorbed oil gas containing the nitrogen gas in the second adsorption tower 4 to the second adsorption tower 4 through a heat exchanger 5 and the circulating fan 6 in sequence in the regeneration process.
If the second pressure transmission controller PIC-112 exceeds the set value of 0.001 during the regeneration process, the twelfth control valve SV12 is automatically opened to exhaust the gas from the gasoline storage tank 8, and when the second pressure transmission controller PIC-112 reaches the set value of 0.00001, the twelfth control valve SV12 is automatically closed. When the difference between the values of the fifth temperature transmitter TI-115 and the sixth temperature transmitter TI-116 reaches less than 1-4 ℃, the circulation is kept for 30 minutes, and the circulating fan 6 is stopped. Then, the tenth control valve SV10 is opened, the vacuum pump 7 is started, the vacuum is maintained for 20 minutes when the pressure of the second pressure transmission controller PIC-112 reaches the set value-0.99, the tenth control valve SV10 is closed, the vacuum pump 7 is stopped, the eleventh control valve SV11 is opened to charge nitrogen to the set value of the second pressure transmission controller PIC-112 of 0.00001, the eleventh control valve SV11 is closed, and the regeneration of the second adsorption tower 2 is completed.
Defrosting of the first condenser and the second condenser:
when the seventh temperature transmitter TI-117 arranged on the pipeline connecting the first condenser 1 and the adsorption tower detects that the temperature is lower than the set value minus 30 ℃, the defrosting operation is carried out. Firstly, a fourteenth control valve SV14 and an eighteenth control valve SV18 are opened, a thirteenth control valve SV13, a fifteenth control valve SV15 and a seventeenth control valve SV17 are closed, a compressor 9 is started, hot end gas of a vortex tube 10 enters a second defrosting tube of a second condenser 2 to carry out partition wall heat exchange to heat the second condenser 2, then enters a first defrosting tube of a first condenser 1 to carry out partition wall heat exchange to heat the first condenser 1, and then enters an air inlet of the compressor 9. The gas at the cold end of the vortex tube 10 enters the gas inlet of the compressor 9 through SV16 and is recycled. When the eighth temperature transmitter TI-118 on the connection pipe between the first refrigerant pipe and the compressor 9 reaches a set value, the defrosting is finished, the thirteenth control valve SV13, the fifteenth control valve SV15, and the seventeenth control valve SV17 are opened, the fourteenth control valve SV14, and the eighteenth control valve SV18 are closed.
The inventive concept is explained in detail herein using specific examples, and the above description of the embodiments is only used to help understand the core idea of the present invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The oil gas recovery system of the gas station is characterized by comprising a first condenser (1), a second condenser (2), a compressor (9), a vortex tube (10), a heat exchanger (5), a circulating fan (6), an adsorption tower and an oil gas storage tank (8); wherein the content of the first and second substances,
the first condenser (1) is used for receiving oil gas and precooling the oil gas, and the first condenser (1) is connected with the second condenser (2) so that the precooled oil gas is further deep-frozen in the second condenser (2); the second condenser (2) is connected with the vortex tube (10) to receive cold energy provided by the vortex tube (10), and the second condenser (2) is also connected with the adsorption tower through a pipeline and is used for conveying cryogenic oil gas into the adsorption tower;
the compressor (9) is connected with the vortex tube (10) to provide compressed gas for the vortex tube (10), the vortex tube (10) comprises a cold end and a hot end, the cold end is connected with the second condenser (2) and used for providing cold energy for the second condenser (2), and the hot end is connected with the heat exchanger (5) and used for providing heat for the heat exchanger (5);
the heat exchanger (5) is connected with the hot end of the vortex tube (10) and used for receiving heat provided by the hot end; the heat exchanger (5) is also connected with the adsorption tower and used for heating the gas passing through the adsorption tower; the heat exchanger (5) is also connected with a circulating fan (6) through a pipeline to provide gas heated by the heat exchanger for the circulating fan (6); the circulating fan (6) is also connected with the adsorption tower and is used for feeding the heated gas into the adsorption tower;
the adsorption tower is internally provided with an adsorbent and is also connected with a vacuum pump (7) for pumping gas in the adsorption tower and a nitrogen tank (11) for filling nitrogen into the adsorption tower; the adsorption tower is connected with a heat exchanger (5) through a pipeline to send discharged gas to the heat exchanger (5) for heating;
the first condenser (1), the second condenser (2), the adsorption tower and the vacuum pump (7) are all connected with an oil gas storage tank (8) through pipelines.
2. A gasoline station vapor recovery system according to claim 1,
the first condenser (1) comprises an oil-gas precooling shell, a first refrigerant pipe and a first defrosting pipe, wherein the oil-gas precooling shell can exchange heat with one another, an inlet of the oil-gas precooling shell is connected with an oil-gas recovery pipe, and an outlet of the oil-gas precooling shell is connected with an air inlet of the oil-gas copious cooling shell; the air inlet of the first refrigerant pipe is connected with the air outlet of the oil-gas deep cooling shell, the inlet of the first defrosting pipe is connected with the air outlet of the second defrosting pipe, the air outlet of the first defrosting pipe is connected with the air inlet of the compressor (9) to provide an air source for the compressor (9), and the air outlet of the first refrigerant pipe is connected with the air inlet of the adsorption tower;
the second condenser (2) comprises an oil-gas deep cooling shell, a second refrigerant pipe and a second defrosting pipe, wherein the oil-gas deep cooling shell can exchange heat with one another, an air inlet of the oil-gas deep cooling shell is connected with an air outlet of the oil-gas pre-cooling shell, and an air outlet of the oil-gas deep cooling shell is connected with an air inlet of the first refrigerant pipe; the air inlet of the second refrigerant pipe is connected with the cold end of the vortex pipe (10), and the air outlet of the second refrigerant pipe is connected with the air inlet of the compressor (9) to provide an air source for the compressor (9); and the air inlet of the second defrosting pipe is connected with the hot end of the vortex pipe (10), and the air outlet of the second defrosting pipe is connected with the air inlet of the first defrosting pipe.
3. A gasoline station vapor recovery system according to claim 2,
the air outlet of the first defrosting pipe is connected with the air inlet of the compressor (9) through a pipeline provided with an eighteenth control valve (SV 18), and the air outlet of the second refrigerant pipe is connected with the air inlet of the compressor (9) through a pipeline provided with a seventeenth control valve (SV 17); and the gas outlet of the first refrigerant pipe is connected with the gas inlet of the adsorption tower through a pipeline provided with a first control valve (SV 1).
4. A gasoline station oil and gas recovery system according to claim 2 or 3,
the vortex tube (10) comprises a vortex chamber, the two ends of the vortex chamber are respectively a cold end and a hot end, and an air inlet of the vortex chamber is connected with an air outlet of the compressor (9); the cold end is connected with the air inlet of the second refrigerant pipe through a pipeline provided with a fifteenth control valve (SV 15); the hot end is connected with a heat exchange tube of the heat exchanger (5) through a pipeline;
the heat exchanger (5) comprises a heat exchange tube and a heat exchanger shell which can exchange heat with each other, an air inlet of the heat exchange tube is connected with the hot end, and an air outlet of the heat exchange tube is connected with an air inlet of the compressor (9) to provide an air source for the compressor (9); the air inlet of the heat exchanger shell is connected with the adsorption tower and used for receiving gas discharged from the adsorption tower, and the air outlet of the heat exchanger shell is connected with the air inlet of the circulating fan (6);
and the air inlet of the circulating fan (6) is connected with the air outlet of the heat exchanger shell, and the air outlet of the circulating fan (6) is connected with the adsorption tower.
5. A gasoline station vapor recovery system according to claim 4,
the hot end of the vortex tube (10) is connected with the air inlet of the second defrosting tube through a pipeline provided with a fourteenth control valve (SV 14), and the cold end of the vortex tube (10) is also connected with the air inlet of the compressor (9) through a pipeline provided with a sixteenth control valve (SV 16); the vortex tube (10) is connected with the heat exchanger (5) through a pipeline provided with a thirteenth control valve (SV 13); the first defrosting pipe is connected with an air inlet of the compressor (9) through a pipeline provided with an eighth temperature transmitter (TI-118).
6. A gasoline station vapor recovery system according to claim 5,
and the air outlet of the first refrigerant pipe is connected with the air inlet of the adsorption tower through a pipeline provided with a seventh temperature transmitter (TI-117).
7. A gasoline station hydrocarbon recovery system according to any of the claims 1-3, characterized in that the adsorption towers comprise a first adsorption tower (3) and a second adsorption tower (4),
the first adsorption tower (3) is connected with the second condenser (2) through a pipeline provided with a first control valve (SV 1) to receive oil gas subjected to deep cooling; the first adsorption tower (3) is also connected to an exhaust gas discharge pipe through a pipeline provided with a third control valve (SV 3);
the second adsorption tower (4) is connected with the second condenser (2) through a pipeline provided with a second control valve (SV 2) to receive the oil gas subjected to deep cooling; the second adsorption tower (4) is also connected to the exhaust gas discharge pipe through a pipeline provided with a fourth control valve (SV 4);
and an oil gas VOC analyzer is arranged on the waste gas discharge pipe.
8. A gasoline station vapor recovery system according to claim 7,
the first adsorption tower (3) is connected with an oil gas storage tank (8) through a pipeline provided with a first pressure transmission controller (PIC-111), is connected with a vacuum pump (7) through a pipeline provided with an eighth control valve (SV 8), and is connected with a nitrogen tank (11) through a pipeline provided with a fifth control valve (SV 5);
and the second adsorption tower (4) is connected with an oil gas storage tank (8) through a pipeline provided with a second pressure transmission controller (PIC-112), is connected with a vacuum pump (7) through a pipeline provided with a ninth control valve (SV 9), and is connected with a nitrogen tank (11) through a pipeline provided with a sixth control valve (SV 6).
9. A gasoline station vapor recovery system as claimed in claim 7,
a sixth temperature transmitter (TI-116) is arranged on a pipeline connecting the heat exchanger (5) and the circulating fan (6);
the first adsorption tower (3) is connected with the heat exchanger (5) through a pipeline provided with a fourth temperature transmitter (TI-114);
the second adsorption tower (4) is connected with the heat exchanger (5) through a pipeline provided with a fifth temperature transmitter (TI-115).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222522248.7U CN218248601U (en) | 2022-09-21 | 2022-09-21 | Oil gas recovery system of filling station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222522248.7U CN218248601U (en) | 2022-09-21 | 2022-09-21 | Oil gas recovery system of filling station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116899361A (en) * | 2023-07-17 | 2023-10-20 | 江苏利锦莱德固废综合利用有限公司 | Low-cost VOC recovery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116899361A (en) * | 2023-07-17 | 2023-10-20 | 江苏利锦莱德固废综合利用有限公司 | Low-cost VOC recovery system |
| CN116899361B (en) * | 2023-07-17 | 2024-05-03 | 江苏利锦莱德固废综合利用有限公司 | Low-cost VOC recovery system |
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