JP2004035091A - Gasoline vapor collecting method and collecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasoline vapor collecting method and its collecting apparatus capable of surely collecting the gasoline vapor generated during gasoline supply by adsorption. <P>SOLUTION: The gasoline vapor collecting apparatus 1 has a gasoline vapor introducing means 10 introducing the gasoline vapor and a removably attachably replaceably mounted gasoline vapor adsorbing means 20 adsorbing the gasoline vapor. The gasoline vapor collecting method includes a process of collecting the gasoline vapor generated during gasoline supply at a gas station and making an adsorbing means 20 adsorb it by use of the gasoline vapor collecting apparatus 1 and a desorption process of desorbing the gasoline component from the adsorbing means 20 after the adsorbing means 20 having the adsorbed gasoline vapor is removed from the gasoline vapor collecting apparatus 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and a device for collecting gasoline vapor that adsorb and capture gasoline vapor generated during refueling of a vehicle at a gas station.
[0002]
[Prior art]
With the recent tightening of regulations on environmental purification, there has been an increasing trend to reduce the amount of chemical substances emitted from chemical factories and to recover and reuse chemical substances.
Therefore, in a chemical factory or the like that uses a large amount of a solvent or the like, a solvent is recovered by an adsorption method, and examples thereof include a recovery of methylene chloride and a recovery of cyclohexanone. These are both fixed bed adsorption devices using activated carbon or activated carbon fibers as adsorbents, and when desorbing a solvent from the adsorbent, it is generally performed under heating using a heat source such as steam. It is a target.
[0003]
By the way, when gasoline is supplied to a car at a gas station, gasoline vapor is generated. At present, this gasoline vapor is released into the atmosphere (environment) as it is, and no measures such as recovery have been taken.
[0004]
Japanese Patent Application Laid-Open No. 60-110697 discloses a means for liquefying and recovering gasoline vapor generated during refueling of a fuel tank of an automobile at a gas station. This gasoline vapor liquefaction and recovery means dissolves gasoline vapor into the absorbent by trapping gasoline vapor generated during refueling and diffusing it into the gasoline absorbent using a hood provided at the nozzle valve at the tip of the refueling hose. And collect them.
[0005]
Then, the gasoline absorbent saturated by capturing gasoline is regenerated by vaporizing and removing gasoline components from the gasoline absorbent by applying a negative pressure. On the other hand, the gasified gasoline is configured to be liquefied by adjusting the pressure and to accumulate in a predetermined receiver.
[0006]
[Problems to be solved by the invention]
However, for example, when the above-mentioned adsorption device using activated carbon or the like as an adsorbent is applied to gasoline vapor recovery, the heat of adsorption generated at the time of adsorption cannot be removed, and there is a risk of ignition due to a superheated portion. is there. In addition, the application is extremely important because the steam source used for desorption must be secured, a large installation area is required, and a large amount of water is mixed in the gasoline recovered by desorption. Have difficulty.
[0007]
Further, in Japanese Patent Application Laid-Open No. 60-110697, the solenoid valve inside the apparatus is a problem in terms of security of a gas station, and new work such as extracting and managing collected gasoline occurs.
[0008]
An object of the present invention is to provide a gasoline vapor collecting method and a collecting device which do not have the above-described problems and can reliably collect gasoline vapor generated during refueling by adsorbing the gasoline vapor. It is in.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of a gasoline vapor collecting method according to claim 1 is a gasoline vapor introducing means for introducing gasoline vapor, and a gasoline which is detachably and interchangeably provided and adsorbs gasoline vapor. Using a gasoline vapor collecting device having a vapor adsorbing means, gasoline vapor generated during refueling a car at a gas station is collected and adsorbed by the adsorbing means, and the gasoline vapor is adsorbed. After the adsorption means is removed from the gasoline vapor collecting device, a desorption step of desorbing gasoline components from the adsorption means is included.
[0010]
According to this feature, in the adsorption step, gasoline vapor generated during refueling the automobile can be reliably collected. Further, when the adsorption capacity of the adsorbing means is reduced due to the adsorption of gasoline vapor or the like, the gasoline vapor can be immediately collected by removing the adsorbing means and replacing it with a new adsorbing means.
[0011]
Further, in the desorption step, the gasoline component adsorbed by the adsorption means is desorbed, so that the adsorption means is regenerated and the adsorbability of gasoline vapor is reproduced, so that it can be reused as a new adsorption means. Further, since the gasoline component desorbed from the adsorption means has a high concentration, it can be reused as a fuel or the like by collecting it.
[0012]
In addition, the invention of a gasoline vapor collecting device according to claim 2 is provided detachably and replaceably with gasoline vapor introduction means for introducing gasoline vapor generated during refueling a car at a gas station, Gasoline vapor adsorbing means for adsorbing the introduced gasoline vapor.
[0013]
According to this feature, since the gasoline vapor is adsorbed by the adsorbing means, gasoline vapor generated during refueling of the vehicle is collected and securely adsorbed, thereby preventing gas diffusion into the environment. Can be. In addition, since the adsorption means is removable and replaceable, if the adsorption capacity of gasoline vapor in the adsorption means is reduced, remove the adsorption means and replace it with a new adsorption means to reproduce high adsorption capacity. It is possible to immediately resume gasoline vapor collection. In addition, the introduction means allows the gasoline vapor to be efficiently introduced into the device and adsorbed by the adsorption means.
[0014]
The invention of a gasoline vapor collecting device according to a third aspect is characterized in that, in the second aspect, the adsorbing means includes an adsorbing device for adsorbing gasoline vapor and a cooling device for cooling the adsorbing device. Features.
[0015]
According to this feature, since the heat of adsorption generated when gasoline vapor is adsorbed can be removed by cooling the adsorption device by the cooling means, there is no danger of ignition, etc., and the adsorbent adsorbing ability is stably maintained. can do.
[0016]
According to a fourth aspect of the present invention, there is provided a gasoline vapor collecting apparatus according to the second or third aspect, wherein the gasoline vapor collecting apparatus includes a moving unit.
[0017]
According to this feature, the attachment / detachment / replacement operation of the suction means can be easily performed by, for example, moving the suction means manually. In addition, at a gas station with a narrow site, the gasoline vapor collecting device can be moved according to the conditions at the time of refueling so that it does not hinder refueling work, etc., and furthermore, the gasoline vapor collecting device can collect gasoline vapor according to the type of automobile. It is possible to move to the most suitable position for the collection.
[0018]
According to a fifth aspect of the present invention, there is provided a gasoline vapor collecting device according to the third aspect, wherein the adsorbing device is formed by overlapping flow paths formed by partition plates provided with heat transfer fins. It is a plate-fin heat exchanger type adsorption device in which adsorption channels filled with an adsorbent to be adsorbed and heat exchange channels through which a heat medium flows are alternately arranged.
[0019]
According to this feature, since the adsorption device is a plate fin heat exchanger type, the heating and cooling of the adsorbent can be performed indirectly. That is, high-concentration gasoline can be recovered without mixing the heat medium into the recovered gasoline.
[0020]
According to a sixth aspect of the present invention, there is provided a gasoline vapor collecting device according to any one of the second to fifth aspects, wherein the gasoline vapor introducing means has a gas suction device for sucking the gasoline vapor, The gas suction device is characterized in that the gas suction device is disposed downstream of the adsorption means in the gas flow path.
[0021]
According to this feature, since the gas suction device for sucking gasoline vapor is arranged downstream of the adsorption means, the gas passing through the gas suction device is a purified gas containing almost no gasoline component (that is, gasoline vapor is not used). Gas after being adsorbed by the adsorption means), and there is no danger of ignition or the like even if this purified gas passes through the gas suction device.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
The gasoline vapor collecting method of the present invention uses a gasoline vapor collecting device 1 described later to collect gasoline vapor generated during refueling of a vehicle at a gas station, and to collect the gasoline vapor in an adsorbing device 20 as an adsorbing means. The method includes an adsorption step of adsorbing, and a desorption step of desorbing gasoline components from the adsorption device 20 after removing the adsorption device 20 that has adsorbed gasoline vapor from the gasoline vapor collection device 1.
[0023]
FIG. 1 shows an embodiment of a gasoline vapor collecting device 1 according to the present invention, and FIG. 2 shows gasoline generated during refueling of an automobile using the gasoline vapor collecting device 1. It is an example of the collection of vapor. Note that arrows in FIG. 1 indicate gas flow paths.
[0024]
As shown in the drawing, the gasoline vapor collecting device 1 includes a gas suction device 10 as a means for introducing gasoline vapor into the device, and an adsorption device 20 as a means for adsorbing the introduced gasoline vapor. A cooling water circulating device 15 as a means for cooling the cooling water. The adsorbing device 20 is detachable, that is, separable from the gas suction device 10 and the cooling water circulating device 15 and is provided so as to be exchangeable.
[0025]
The adsorber 20 can be used without particular limitation as long as it can adsorb gasoline vapor. For example, a plate fin heat exchanger adsorber, a shell and tube heat exchanger adsorber, a plate A heat exchanger adsorption device or the like can be employed. Here, an embodiment using a plate fin heat exchanger type adsorption device as the adsorption device 20 will be described. The gasoline vapor collecting device 1 has a suction gas amount of 1 m ³ / h, a gasoline vapor concentration in the suction gas of 15% by volume (the rest is air), a relative humidity of the suction gas of 70%, and a cooling water temperature of 30 ° C. Assuming that the operation time per day (that is, the integrated value of the time required for one refueling) is 2.5 hours, the apparatus size is approximately 1.6 m, The width is 1.1 m and the depth is 0.8 m.
[0026]
As shown in FIG. 2, the introduction port 11 for introducing gasoline vapor is installed near a location where gasoline vapor generated during refueling of the automobile 7 is generated, for example, near a refueling port 7 a for a fuel tank of the automobile 7. It is configured such that gasoline vapor can be efficiently introduced into the adsorption device 20. The suction hose 19 connecting the inlet 11 and the suction device 20 can be provided with a filter for filtering dust and the like contained in the air. The specific shape, size, and the like of the inlet 11 or the suction hose 19 can be appropriately set according to use conditions such as efficiently capturing gasoline vapor. Reference numeral 8 denotes a refueling machine disposed at a gas station, and reference numeral 9 denotes a refueling hose that extends from the refueling machine 8 and supplies fuel to a fuel tank of the automobile 7.
[0027]
Further, a gas suction pump 13 which is a component of the gas suction device 10 in FIG. 1 is installed downstream of the adsorption device 20 in the gas flow path. With such a configuration, the gas passing through the gas suction pump 13 is a gas in which gasoline vapor is captured by passing through the adsorption device 20, that is, a purified gas containing almost no gasoline component. There is no danger of ignition and ignition. The purified gas that has passed through the gas suction pump 13 is discharged from the outlet 12 into the atmosphere (environment).
[0028]
The cooling water circulation device 15 cools the adsorption device 20 by flowing cooling water as a cooling medium through a heat exchange flow path 21 formed inside the adsorption device 20 described below. As the configuration, for example, a cooling water storage tank 15a and a circulation pump 15b for circulating the cooling water, which include a cooling device (not shown) for maintaining the cooling water at a predetermined temperature can also be used.
[0029]
The gasoline vapor collecting apparatus 1 according to the present embodiment has a carriage 30 as a moving means, and can be moved by, for example, human power. Thereby, the attachment / detachment / replacement work of the suction device 20 described later can be easily performed, and even if the suction apparatus 20 is installed in the gas station, it does not hinder the oil supply work or the like.
[0030]
Since the adsorbing device 20 is detachable and replaceable, the adsorbing device 20 is replaced when the gasoline vapor adsorbing ability is reduced. This replacement is performed by removing the adsorption device 20 from the gasoline vapor trapping device 1 or by removing the adsorption device 20 together with the carriage 30 and replacing it with a fresh adsorption device 20.
[0031]
The replacement of the adsorption device 20 can be performed, for example, by monitoring the concentration of gasoline contained in the purified gas discharged from the exhaust port 12 and detecting a gasoline component having a predetermined value or more. The method for detecting the gasoline concentration is not particularly limited, but examples include measurement using an analyzer or measurement using a detection tube, and the method using the detection tube is preferred because it is simple.
[0032]
The suction device 20 according to the present embodiment is configured by a casing made of metal such as aluminum, and the inside thereof forms a suction portion 29 as shown in FIG. As shown in the drawing, the adsorbing section 29 is configured such that heat exchange channels 21 and adsorption channels 22 are alternately arranged so that their flow directions are orthogonal to each other. Have been. Heat transfer fins 25 extending in the same direction as the flow direction are provided in the heat exchange channel 21 and the adsorption channel 22, respectively. As the heat transfer fins 25, those having a corrugated structure or a staggered structure can be used. In FIG. 3, the flow directions of the heat exchange flow path 21 and the adsorption flow path 22 are arranged so as to be orthogonal to each other.
[0033]
The heat medium to be circulated through the heat exchange flow path 21 can be appropriately set according to use conditions and the like. For example, a heat medium for cooling can be used when gasoline vapor is adsorbed, and when a gasoline component is desorbed. Can use a heating medium for heating. By allowing the heat medium to flow through the heat exchange channel 21 in this way, the adsorption channel 22 can be indirectly cooled or heated via the partition plate 24.
[0034]
The adsorption channel 22 is filled with an adsorbent 26 that adsorbs gasoline components. As the adsorbent 26, any adsorbent capable of adsorbing gasoline components can be used without particular limitation. More specifically, for example, activated carbon, silica gel, zeolite, and the like can be adopted, and activated carbon is preferable because of its high adsorptivity.
[0035]
When a cooling heat medium is used to adsorb gasoline vapor, the heat of adsorption due to the adsorption of gasoline vapor can be removed and the generation of an overheated portion can be prevented. Activated carbon can be used.
[0036]
Next, an adsorption step for adsorbing gasoline vapor and a desorption step for desorbing gasoline components will be described with reference to FIGS. 4 and 5.
[0037]
The adsorption step is performed by attaching the adsorption device 20 to the gasoline vapor collecting device 1 and introducing gasoline vapor into the device. As shown in FIG. 4, the gasoline component contained in the gasoline vapor 50 is adsorbed and captured by the adsorbent 26 by passing the gasoline vapor 50 through the adsorption channel 22. As a result, the purified gas 51 containing no gasoline component is discharged from the outlet of the adsorption channel 22. At this time, by flowing a cooling heat medium 52 such as cooling water through the heat exchange channel 21 to indirectly cool the adsorbent 26, heat of adsorption generated when gasoline is adsorbed to the adsorbent 26 is removed. As a result, it is possible to prevent the generation of an overheated portion, thereby safely adsorbing gasoline vapor without danger of ignition or the like, and stably maintaining the adsorption capacity of the adsorbent 26.
[0038]
After the adsorption device 20 that has adsorbed gasoline vapor and has reduced adsorption capacity is removed from the gasoline vapor collection device 1, desorption and recovery operations of gasoline components are performed. The operation of desorbing and recovering the gasoline component can be performed, for example, by transporting the removed adsorption device 20 to a predetermined business office or the like outside the gas station.
[0039]
In the desorption step, in a state where the gasoline component is adsorbed on the adsorbent 26, as shown in FIG. 5, a heating heat medium 53 such as steam is passed through the heat exchange channel 21 to indirectly adsorb the adsorbent 26. A depressurizing operation of reducing the pressure from the inlet side of the gasoline vapor 50 in the adsorption channel 22 by a vacuum pump 71 or the like while heating, and purging gas from the outlet side of the purification gas 51 of the adsorption channel 22 in this heated / depressurized state. A purging operation for flowing 54 is performed. Thus, the gasoline component adsorbed by the adsorbent 26 is desorbed, and the gas 55 containing the gasoline component at a high concentration is discharged. Further, as described above, it is preferable that the purge gas 54 be circulated in a direction opposite to the flow direction of the gasoline vapor 50.
[0040]
The gas 55 containing the gasoline component at a high concentration is sent to a cooling device 72 such as a condenser, where the gasoline component is liquefied to recover a liquid gasoline 56. Since the recovered gasoline 56 has a high concentration, it can be used for recycling fuel, refinery, and the like. On the other hand, the gas 57 from which the gasoline component has been removed by the cooling device 72 is discharged from the device. In the case where the gas 57 contains gasoline components that cannot be completely collected in the cooling device 72, the gas 57 is introduced into a separately installed adsorption device to adsorb and process the gasoline components, And the like, and incineration treatment can further reduce the emission of gasoline vapor to the environment. Here, the purge gas 54 preferably does not contain a component that reacts with gasoline, for example, oxygen, and examples thereof include nitrogen, helium, argon, and carbon dioxide.
[0041]
The vacuum pump 71 for sucking the purging gas 54 can use an explosion-proof structure, and the use of an ignition prevention specification can avoid the danger of ignition or the like. In some cases, a contained gas can be used. Further, by pressurizing the exhaust gas from the vacuum pump, the gasoline component can be more easily liquefied and recovered. The pressurizing means at this time includes a vacuum pump with a mechanical booster and a blower.
[0042]
【The invention's effect】
As described above, according to the present invention, gasoline vapor generated during refueling of a car at a gas station can be collected, and thus, gasoline vapor emission to the environment can be minimized. In addition, it is sufficient to install the gasoline vapor collecting apparatus of the present invention in an existing gas station without requiring any special construction or the like.
[0043]
Further, in the gasoline vapor collecting device of the present invention, since the adsorbing device is provided detachably and replaceably, when the adsorbing ability of gasoline vapor is reduced, the adsorbing device is replaced to immediately replace the gasoline vapor. Capture can be resumed. In addition, since it is space-saving and has moving means, it does not hinder refueling work or the like in a gas station.
[0044]
In addition, since the adsorption device that has adsorbed gasoline vapor can be regenerated by desorbing gasoline components, it can be used again as a new adsorption device. The desorbed gasoline component can also be recovered and used as fuel or the like.
[Brief description of the drawings]
FIG. 1 is a drawing showing one embodiment of a gasoline vapor trapping device of the present invention.
FIG. 2 shows an example of collecting gasoline vapor generated during refueling of an automobile using the gasoline vapor collection device.
FIG. 3 is an example of an internal structure of a suction device.
FIG. 4 is a drawing for explaining the principle of adsorption in an adsorption device.
FIG. 5 is a drawing for explaining the principle of desorption in the adsorption device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gasoline vapor collection device 7 Automobile 8 Refueling machine 9 Refueling hose 10 Gas suction device 11 Inlet 12 Exhaust port 13 Gas suction pump 15 Cooling water circulation device 19 Suction hose 20 Adsorption device 21 Heat exchange channel 22 Adsorption channel 24 Partition plate 25 Heat transfer fins 26 Adsorbent 29 Adsorber 30 Truck 50 Gasoline vapor 51 Purified gas 52 Cooling heat medium 53 Heating medium 54 Purging gas 55 Gas containing high concentration of gasoline vapor 56 Recovered gasoline 57 Cooling Gas passed through the device 71 Vacuum pump 72 Cooling device

Claims (6)

Using a gasoline vapor collecting device having gasoline vapor introducing means for introducing gasoline vapor and detachably and replaceably provided gasoline vapor adsorbing means for adsorbing gasoline vapor, the vehicle is used at a gas station at a gas station. An adsorption step of collecting gasoline vapor generated during refueling and adsorbing the gasoline vapor on the adsorption means,
A method for collecting gasoline vapor, comprising a desorption step of removing gasoline components from the adsorption means after removing the adsorption means having adsorbed gasoline vapor from the gasoline vapor collection device. Gasoline vapor introduction means for introducing gasoline vapor generated during refueling a car at a gas station;
A gasoline vapor collecting device, comprising: a gasoline vapor adsorbing means that is detachably and replaceably provided and adsorbs introduced gasoline vapor. 3. The gasoline vapor collecting device according to claim 2, wherein the adsorbing device includes an adsorbing device for adsorbing gasoline vapor and a cooling device for cooling the adsorbing device. The gasoline vapor collection device according to claim 2 or 3, wherein the gasoline vapor collection device includes a moving unit. In the third aspect, the adsorption device is configured by overlapping flow paths formed by partition plates provided with heat transfer fins, and flows an adsorption flow path filled with an adsorbent for adsorbing gasoline vapor and a heat medium. A gasoline vapor collecting device, which is a plate-fin heat exchanger type adsorption device in which heat exchange channels are alternately arranged. In any one of claims 2 to 5, the means for introducing gasoline vapor has a gas suction device for sucking gasoline vapor, and the gas suction device is provided downstream of the adsorption means in a gas flow path. A gasoline vapor trap, which is arranged.

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