JP2009072098A - Method of killing harmful organisms attached to vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for safe heat-treating of a vehicle, without increasing the gasoline concentration inside a booth. <P>SOLUTION: The method for housing a vehicle inside a booth, heating a gas in the booth and killing harmful organisms attached to the vehicle includes heating the gas in the booth, while discharging gasoline vapor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for killing pests attached to a vehicle. More specifically, the present invention relates to a method for heating a vehicle and killing pests attached to the vehicle while preventing an increase in gasoline concentration.

In recent years, exports of used cars have been active. At this time, Oceania countries such as New Zealand, which have their own ecosystems, are required to inspect all imported used vehicles and detoxify the pests attached to the vehicles in order to maintain the ecosystem. Yes.
A fumigation method is known as a method for killing pests. However, the fumigation method uses chemicals that are toxic to the human body and have a negative impact on the environment.
Therefore, methods for killing pests by heat-treating vehicles have been studied. That is, a method of storing a vehicle in a booth, heating gas in the booth, and killing pests attached to the vehicle has been studied. If the temperature in the booth is raised, the gasoline in the vehicle's gasoline tank will vaporize, increasing the gasoline concentration in the booth, causing a risk of fire and air pollution.
On the other hand, as a method for preventing the generation of gasoline vapor, it may be possible to extract gasoline from the vehicle in advance. However, extracting gasoline from all vehicles is cumbersome and time consuming. Also, the risk of fire due to gasoline ignition increases.

  Therefore, an object of the present invention is to provide a method for safely heat-treating a vehicle without increasing the gasoline concentration in the booth.

  The present inventor has studied a method of heat treating a vehicle while preventing an increase in gasoline concentration in the booth. As a result, it has been found that it is effective to heat-treat the vehicle while discharging gasoline vapor in the booth, and the present invention has been completed.

  That is, the present invention is a method of storing a vehicle in a booth, heating gas in the booth, and killing pests attached to the vehicle, and heating while discharging gasoline vapor. is there.

  According to the present invention, pests adhering to the vehicle can be safely killed without increasing the gasoline concentration in the heat treatment of the vehicle in the booth.

  The present invention is a method in which a vehicle is housed in a booth, gas in the booth is heated, and a pest attached to the vehicle is killed, and heating is performed while exhausting gasoline vapor.

(booth)
The booth includes a floor portion (19), a front wall portion (21) having a vehicle loading / unloading portion (20), a rear wall portion (22), left and right side wall portions (23), and a roof portion (24) covering them. ). An example of the booth is shown in FIG.
The booth may have any shape such as a box shape, a dome shape, or a three-dimensional shape that allows a vehicle to be carried in and out, and the shape is not particularly limited. The booth should have a dual structure building that is not directly exposed to wind and rain and minimizes the heat loss of the heated gas. The booth is preferably 15 to 40 m long and 9 to 40 m wide. The number of vehicles in the booth is preferably 3-40. Two units are not practical due to the low efficiency of the number of processed units, preferably four units. When the number of units accommodated is 41 units or more, the temperature of the gas in the entire vehicle is not uniform, and preferably 16 units.
It is preferable that the rear wall portion (22) of the booth, the left and right side wall portions (23), and the roof portion (24) covering them have heat insulating materials. The thickness of the heat insulating material is preferably 5 to 200 mm. If it is less than 5 mm, the heat insulating effect is poor. Moreover, when it exceeds 200 mm, there is no change in the heat insulation effect. Preferably it is 20-100 mm. As the heat insulating material, polystyrene foam, rigid polyurethane foam, rock wool, glass wool, fiber-mixed cement board and the like are preferable.

  A water groove having a width of 10 to 100 mm and a depth of 10 to 100 mm is installed on the floor of the front wall portion including the carry-in / out section (20), and a thermal barrier sheet is suspended from the ceiling of the carry-in / out section. It is preferable that the booth is soaked to ensure airtightness of the booth and prevent heat loss of the heated air. The thickness of the thermal barrier sheet is preferably 0.1 to 50 mm. If it is thinner than 0.1 mm, the heat insulation effect is poor. If it is thicker than 50 mm, it will interfere with the loading and unloading of the vehicle. Preferably it is 2-10 mm. Examples of the thermal barrier sheet include plastic sheets such as vinyl chloride resin and polyethylene resin, cotton cloth, synthetic fiber cloth, and rubber.

The booth preferably has a seat hung from the upper part of the front wall as an opening / closing part for carrying in and out of the vehicle. Moreover, it is preferable that the skirt part of this sheet | seat is put in a water groove, and airtightness is maintained with the water in a water groove. That is, the booth has a seat suspended from the upper portion of the front wall portion, and the skirt portion of the seat is preferably placed in the water groove and airtightness is maintained by the water in the water groove. .
In order to facilitate loading and unloading of the vehicle, it is preferable to have a tire guide on the floor of the booth.
The booth preferably has a combustible gas detection alarm device. Examples of the alarm device include a handy type, a wall-mounted type, and a stationary type, and a stationary type is preferable. In addition, examples of the measurement method include an infrared method, a catalytic combustion method, and a semiconductor method.
The booth preferably has explosion-proof equipment. Devices that require explosion-proof equipment include heating devices, gas flow devices, exhaust devices, flammable gas alarm devices, lighting fixtures, and the like.

The booth preferably has an explosion-proof automatic control system. The system measures the gasoline concentration at three or more locations with a stationary concentration meter, and when the concentration at one of the locations is 1000 ppm or more, the exhaust fan is automatically operated to suck in the outside air gas, and the gasoline concentration is measured. Reduce to 10 ppm or less. When it falls below 10 ppm, the exhaust fan is automatically stopped. In addition, when the gasoline concentration reaches a dangerous concentration (10000 ppm or more) region, the heating is automatically stopped and the emergency warning system automatically replaces the outside air with the exhaust fan.
The booth is preferably installed in the building. The building is preferably a structure that can prevent wind, rain, earthquake, and the like, and has an airtight structure with a shutter that can carry in and out the vehicle. The building is preferably composed of a sheet, a flat plate or a combination thereof, and a support. The building may be comprised from the support | pillar and the flat plate. Examples of the flat plate include a plastic sheet, a metal plate, and a cement plate. The building may be a tent composed of a column and a sheet. The sheet is preferably a flame retardant sheet.
The building may have a size that can install one or more booths, and preferably has a size that can install two or more booths. Therefore, the building is preferably 5 to 50 m wide, 10 to 80 m long, and 2 to 5 m high. It is preferable to have a plurality of booths in the building.

(Vehicle)
The target vehicles of the present invention are mainly used export vehicles, but also include new export vehicles. Examples of vehicles include passenger cars, wagon cars, RV cars, light vans, buses, trucks, and motorcycles.

(Pest)
Pests include insect nets, arthropods such as spiders, and molluscs such as African mussels and snails.

(Storing)
The storage of the vehicle can be performed by starting the vehicle engine and running on its own. When running on its own, there are many vehicles that do not move because the battery is out of charge. Therefore, it is also necessary to charge the battery. Moreover, it can also carry in with a roller and a conveyor.

(heating)
The gas in the booth is air, but carbon dioxide gas, nitrogen gas, or the like may be used in combination.
Moreover, when the gas humidity in a booth is 50 to 80%, it acts effectively on pests.
The temperature of the gas in the booth is preferably 50 to 80 ° C. Pests can be killed by setting the temperature of the gas in the booth to 50 to 80 ° C. Further, the inside of the vehicle has a complicated shape, and it is necessary to suppress the variation in temperature in the vehicle and to heat it as uniformly as possible. In addition, in order to process as many vehicles as possible per hour, it is necessary to process in a short time.

  It is preferable to raise the temperature of the gas with a heating device. Examples of the heating device include a boiler, a sheathed heater, an infrared heater, a far infrared heater, a combustion burner, a heat exchanger, a planar heating element, and a combination thereof. A heat exchanger, a sheathed heater, and a planar heating element are preferable. More preferably, it is a heat exchanger. The heat exchanger may be any of an erotic fin type, a plate fin type, and a fin tube type. The heat medium of the heat exchanger may be any liquid such as water or oil, or steam or gas. Steam or oil is preferred. The temperature of the heat medium of the heating device is preferably 50 to 500 ° C, more preferably 80 to 300 ° C. If the temperature is lower than 50 ° C., the temperature inside the booth is not so good.

The heated gas outlet may be any of a floor, left and right side wall surfaces, a ceiling, a front wall provided with a carry-in / out unit, a rear wall, and the like. Preferably, a floor or / and left and right side walls are preferred. Also, the number of heated gas outlets is preferably two or more. If there are two or more outlets, there will be less variation in the temperature of the gas in the booth.
Booth with boiler (25), steam header (26), steam heat exchange coil (27), circulation fan (28), gas inlet (29), steam piping system (30) and gas circulation piping system (31) An example of the plan view is shown in FIG.

  The gas heated by the heating device is sent into the booth by the gas flow device. Examples of the gas flow device include a blower, a stirrer, and a combination thereof. Examples of the blower and the agitator include a sirocco fan, a roots blower, an axial fan, a hydraulic ventilation fan, and a fan. The gas flow device can be used for heating in the booth and exhausting the gas in the booth. The place where the gas flow device is attached is not particularly limited, but is preferably a ceiling part or a side wall part. The number of gas outlets is preferably two or more. Moreover, the place where the outlet is attached is preferably a floor portion or a side wall portion. The booth preferably has a conduit fitted with a blower.

The gas flow rate is preferably 1 to 5 m / second, more preferably 2 to 3 m / second. If it is less than 1 m / sec, the temperature inside the booth will not rise, and if it exceeds 5 m / sec, the air volume will be too large to control the gas temperature to 50 ° C. or higher, and the cost of the heating device will increase.
The temperature of the gas sent from the gas flow device into the booth is preferably 60 to 80 ° C. If the temperature of the gas is less than 60 ° C., it takes a long time to increase the temperature of the gas in the booth, and the efficiency of the number of processed vehicles is deteriorated. If the temperature exceeds 80 ° C., the amount of gasoline leaked from the gasoline tank increases, the gasoline concentration in the booth increases, the risk of explosion increases, and the vehicle may be damaged.

Heating is preferably performed by blowing a gas having a temperature of 60 to 80 ° C. into the booth with an air volume (V) represented by the following formula.
0.5V ₀ ≦ V
However, _{V 0} booth volume ^(m 3), V is the blowing rate per minute ^{(m 3).}
If the air flow is too large, the amount of heat is wasted. In addition, when the flow is small, temperature unevenness occurs. Therefore, it is more preferable that 0.5V ₀ ≦ V ≦ 1.5V ₀ .
The temperature of the gas in the booth is preferably increased at a rate of 1 to 2 ° C./min. The heating time is preferably 10 minutes to 3 hours, more preferably 30 minutes to 2 hours. If the time for the heating process is less than 10 minutes, the heating equipment and the amount of heat are increased. If it exceeds 3 hours, more gasoline will leak from the gasoline tank and the gasoline concentration in the booth will increase, increasing the risk of explosion. In addition, if the heating process takes a long time, many vehicles cannot be processed. Therefore, it is necessary to increase the number of booths, which increases the cost.
In heating, it is preferable to provide time for maintaining the temperature of the gas in the booth. That is, it is preferable to maintain the temperature of the gas in the booth at 50 to 80 ° C. for 5 minutes to 1 hour. If the maintenance time is too short, there is no effect on pests, and if it is too long, there is no difference in the effect on pests, and the gasoline concentration increases and the risk increases.

(Gasoline vapor discharge)
The gasoline vapor is preferably discharged by discharging the gas in the booth. The gas can be discharged from the inlet of the gas flow device used for heating the gas in the booth. It can also be carried out from the inlet of a gas flow device for discharging gasoline vapor. Examples of the gas flow device include a roots blower, a sirocco fan, and an axial fan. These preferably have explosion-proof specifications.
It is preferable to remove the gasoline by bringing the discharged gas into contact with the adsorbent.
The gas from which gasoline has been removed by contacting with the adsorbent can also be returned to the booth. That is, the gas discharged from the booth can be circulated.

  Examples of the adsorbent include activated carbon, molecular sieve, ceramic absorbent, and silica gel. Activated carbon is particularly preferable as the adsorbent. The activated carbon preferably adsorbs petroleum hydrocarbons mainly composed of mesopores. The component having mesopores of activated carbon is preferably 30 to 70%. Further, the mesopores preferably have 3 to 500 soot and adsorb C2 to C12 petroleum hydrocarbons. If the mesopores are smaller than 3 mm, the regeneration efficiency of the activated carbon is poor. On the other hand, if it is larger than 500 mm, the adsorption of petroleum hydrocarbons having a small number of carbon atoms is poor. Preferably it is 20-300cm. That is, the activated carbon preferably has 30 to 70% mesopores, and the mesopore diameter is preferably 3 to 500 mm. Examples of activated carbon materials include coconut husk, coal, wood, and resin. Coal or wood is preferred. Examples of the activated carbon include Pellet charcoal, crushed charcoal, and powdered charcoal. Pellet charcoal or crushed charcoal is preferable.

The contact time between the gas and the adsorbent is preferably 0.1 minutes to 3 hours, and the superficial velocity (SV value) of the gas is preferably 0.2 to 2.0 m / s.
Further, it is preferable to discharge gasoline vapor by connecting a conduit to a gasoline tank of a vehicle. The conduit is preferably connected to the filling port of the gasoline tank. That is, it is preferable to remove the fuel tank lid of the gasoline tank, and separately attach a lid with a conduit to the gasoline tank filler port to release gasoline vapor from the conduit outside the booth. Examples of the material of the lid, packing, and conduit attached to the lid of the filler port include metals such as copper and aluminum, and plastic resins such as Teflon, nylon, and polyethylene. The inner diameter of the conduit is preferably 4-12 mm.

  It is also preferable to connect the conduit to the atmospheric release system of the gasoline tank to discharge gasoline vapor. The gasoline tank is provided with an air discharge system conduit to prevent vaporized gasoline from being released into the atmosphere. The atmospheric discharge system conduit is connected to the engine intake and a canister filled with activated carbon. During engine startup, the atmospheric discharge system conduit is connected to the engine intake by a control valve, and the gas from the gasoline tank is guided to the engine intake and burned. On the other hand, while the engine is stopped, the atmospheric discharge system conduit is disconnected from the engine intake by the control valve, and the gas from the gasoline tank is released to the atmosphere from a canister filled with activated carbon. Accordingly, the conduit is preferably connected to a conduit for release into the atmospheric release system of the gasoline tank, particularly the canister atmosphere.

Further, it is preferable to remove gasoline vapor discharged from the conduit by adsorption or cooling. That is, gasoline vapor can be removed by adsorbing to activated carbon filled in a container. Moreover, you may cool the gasoline vapor | steam discharged | emitted from a conduit | pipe with a heat exchanger. The cooling temperature is preferably around −20 ° C.
For discharging the gasoline vapor, it is preferable to use both a method of discharging the gas in the booth and a method of discharging from the atmospheric release system of the gasoline tank.
The gasoline concentration in the booth is preferably 300 ppm or less. However, gasoline pollutes the air and is a carcinogenic substance group B type B (a classification with relatively insufficient evidence). In order to minimize the amount, 10 ppm is preferable.

The present invention carries a vehicle into the booth (i), heats the gas in the booth while discharging gasoline vapor (ii), discharges the gas in the booth (iii), and carries the vehicle out of the booth. (Iv).
Carrying in and heating are as described above.
The discharge (iii) of the gas in the booth can be performed using a blower or / and a stirrer. Examples of the blower and the agitator include a sirocco fan, a roots blower, an axial fan, and a hydraulic fan. A blower or the like may be attached separately, but it is preferable to use the same device as the device that blows gas into the booth. Moreover, when using two or more booths, it is preferable that the gas to be discharged is connected to another booth where the vehicle has been carried in using a conduit and the heated gas is effectively used. The air volume which discharges | emits the gas in a booth becomes like this. Preferably it is 8-1000 m < ³ > / min, More preferably, it is 10-500 m < ³ > / min. If the air volume is less than 8 m ³ / min, cooling in the booth is slow, and if the air volume is too large, energy is wasted.
Carrying out the vehicle (iv) can be carried out by starting the vehicle engine and running on its own. When running on its own, there are many vehicles that do not move because the battery is out of charge. Therefore, it may be necessary to charge the battery. Moreover, it can also carry out with a roller and a conveyor.

[Example 1]
<Test equipment>
The test apparatus is shown in FIG.

(booth)
As the booth (1), a sealed reefer container (L: 5,486 mm, W: 2,270 mm, H: 2,234 mm, V: 27.8 m ³ ) without gas leakage was used.

(Vehicle)
As the vehicle (2), a used passenger car (vehicle type; legacy, year; 1997, displacement; 2000 cc, manufactured by Subaru) was used. The vehicle had a canister, and about a quarter of gasoline remained in the gasoline tank.

(Heating device, gas flow device)
As the heating device (3), a hot air generator (model: TSK101B, heater capacity: 45 kW (200 V, 3 phase), manufacturer: Taketsuna Manufacturing Co., Ltd.) was used. A blower (model: YU-2200, 32 m ³ / min, manufacturer: Takeko Seisakusho Co., Ltd.) was used as the gas flow device (4). The suction conduit (6) of the gas flow device (4) was connected to the upper portion of the container, and the discharge conduit (5) of the heating device (3) was connected to the lower portion of the container by an aluminum duct.

(Adsorption tank)
As the adsorption tank (7), a suction port was attached to the lower part of a stainless steel container (diameter: 600 mm, height: 1,000 mm), and a discharge port was attached to the upper lid. Gasoline adsorption activated carbon (8) (trade name: Kuraray Coal, brand: KG, shape: granular, particle size: 8 mesh, bulk specific gravity: 0.7 g / cc) Of 100 kg.

(Discharge device)
As the gas flow device (9), the circulation blower (trade name: electric blower, model: KSB-750 (H), air volume: 23 m ³ / min, static pressure: 2.3 kPa, manufacturer: Showa Denki Co., Ltd.) What attached the inverter to adjust was used. The suction port of the gas flow device (9) was connected to the lower suction port of the booth (1) with an aluminum suction conduit (11) having an inner diameter of 100 mm.
Next, the discharge port of the gas flow device (9) was connected to the lower suction port of the adsorption tank (7) with an aluminum conduit having an inner diameter of 100 mm. A hole was made in this conduit, and an anemo master (10) (Model: 6113, wind speed measurement range: 0.1 to 50 m / s, wind temperature: 0 to 100 ° C., manufacturer: manufactured by Kanomax) was inserted. The suction port (7) was connected to the upper discharge port of the booth (1) by an aluminum suction conduit (12).

<Test method>
(Vehicle storage)
The window of the passenger car was opened and carried into booth (1), and booth (1) was sealed.

(heating)
The heating temperature of the heating device (3) was 200 ° C., the air volume was set at 30 m ³ / min with an inverter, and the hot air discharge temperature was set at 80 ° C. When the display temperature of the thermometer at the measurement points a, b, and c reached 65 ° C., the hot air discharge temperature was set at 65 ° C. and maintained for 30 minutes, and the heating was terminated. The installation location of each temperature is shown in FIG.

(adsorption)
Simultaneously with the start of heating of the heating device, the gas flow device (9) is operated, the air flow rate of the gas flow device (9) is set to 15 m ³ / min with the inverter from the wind speed of the anemo master (10), and the booth ( 1) The air inside was circulated to the adsorption tank (7). The superficial velocity (SV) at this time was 0.88 m / s.

<Evaluation>
(temperature)
The temperature in the booth (1) is set up in a self-recording thermometer (ondori: TR-72S type, manufactured by Thermo Recorder) in (a) container space, (b) under the front seat in the car (c) in the conduit, Measure the change in temperature of the site over time. The air temperature (d) in front of the adsorption tank (7) was printed out from the anemone master (10) after the heating.

(Gasoline concentration)
A Teflon (registered trademark) pipe (inner diameter: 4 mm) is installed in the lower part (a) of the container, the interior space (b) and the lower part of the front seat (c) in the container, and a gasoline measurement detector (model: 101L, Gastec) The product was aspirated 1 to 3 times with a suction pump and measured over time.
At the same time, a polyethylene pipe was installed in the interior space of the vehicle, and a combustible gas alarm (model: GP-88A, contact combustion type, manufactured by Riken Keiki Co., Ltd.) was attached and monitored. The installation location is shown in FIG.

(Empty speed)
The air volume of the blower is calculated by measuring the wind speed of the anemo master (10) and calculating the air volume by wind speed (m / s) × aluminum conduit cross-sectional area (m ² ). The superficial velocity was calculated from the calculated air volume (m ³ / s) by the air volume (m ³ / s) / the adsorption tank cross-sectional area (m ² ).

<Test results>
(1) Table 1 shows changes with time in temperature and gasoline concentration at each location.
(2) There was no abnormality in the combustible gas during the test.

  The outside air temperature (outside the container) changed from 15.4 to 17.3 ° C. for 0 to 71 minutes.

<Discussion>
In the heat treatment, when the temperature at each location 30 minutes after the start of heating becomes 50 ° C or higher, or when the temperature is maintained at 65 ° C for 30 minutes after reaching 65 ° C, all gasoline concentrations are detected (ND) Was not. On the other hand, in the comparative example, when the temperature was 46.0 to 51.3 ° C. 20 minutes after the start of heating, the gasoline concentration was detected as 30 ppm, and then the gasoline concentration increased with temperature and time, and finally reached 600 ppm. From this result, it was found that an increase in gasoline concentration can be prevented by bringing a gas containing gasoline into contact with activated carbon having excellent adsorption ability.

[Example 2]
<Test equipment>
The test apparatus is shown in FIG.

(booth)
The same thing as Example 1 was used.

(Vehicle)
The same thing as Example 1 was used.

(Heating device, gas flow device)
The same thing as Example 1 was used.

(Gas fuel tank gas release device)
A stainless steel screw cap (13) having the same diameter as that of the gasoline fuel tank and a rubber packing were prepared. Teflon (registered trademark) conduit (14) (outer diameter: 6 mm, inner diameter: 4 mm, length: 13 m) is attached to the screw lid (13) with a coating agent, and the gas in the gasoline fuel tank is released outside the container. It was set as the apparatus to do.

(Gasoline removal device)
At the Teflon gas discharge conduit (14) of the gasoline fuel tank, a snake tube (15) (length: snake tube length: about 15 cm glass receiver for physics and chemistry experiments) is attached, and the snake tube (15) is connected to the refrigerant. It was immersed in the cooling container (16) which entered, and it was set as the apparatus which liquefies and removes gasoline.

(Exhaust gasoline concentration measurement)
A Teflon conduit (18) was connected to the tetra bag (17) (size: 150 × 250 mm, registered trademark) on the outlet side of the snake tube (15).

<Test method>
(Vehicle loading)
The same operation as in Example 1 was performed.

(heating)
The same operation as in Example 1 was performed.

(Gas fuel tank gas release)
Open the lid of the gasoline fuel tank of the passenger car, attach the screw lid (13) with the Teflon gas discharge conduit (14) and packing prepared in advance, and attach it to the snake tube (15) outside the booth (1). Connected.
(Gasoline removal)
The serpentine tube (15) was immersed in a cooling vessel (16) containing an acetone-dry ice solution refrigerant cooled to about −20 ° C. to liquefy and remove gasoline.

<Evaluation>
(temperature)
The same operation as in Example 1 was performed. The installation location was the same as in Example 1.

(Gasoline concentration)
The same operation as in Example 1 was performed. The installation location was the same as in Example 1.

(Exhaust gasoline concentration)
Attach a tetra-bag (size: 150 x 250 mm, trademark summary) (17) to the outlet side of the glass snake tube (15) and collect it until the end of heating, and then place a gasoline measurement detector tube (model: 101L, manufactured by Gastech). The sample was sucked 3 times with a suction pump and measured.

<Test results>
(1) Table 2 shows changes with time in temperature and gasoline concentration at each location.
(2) The concentration of exhaust gasoline collected from the start to the end of heating was less than the detection limit.
(3) There was no abnormality in combustible gas during the test.

  The outside air temperature (outside the container) changed from 15.4 to 17.3 ° C. for 0 to 71 minutes.

<Discussion>
In the heat treatment, when the temperature of each part was 50 ° C. or higher in 30 minutes after the start of heating, all gasoline concentrations were not detected (ND). In addition, in the process of maintaining 65 ° C. for 30 minutes after reaching 65 ° C., none of the gasoline concentrations were detected (ND). On the other hand, in the comparative example, when the temperature was 46.0 to 51.3 ° C. 20 minutes after the start of heating, the gasoline concentration was detected as 30 ppm, and then the gasoline concentration increased with temperature and time, and finally reached 600 ppm. From this result, it was found that an increase in gasoline concentration could be prevented by releasing gas containing gasoline from the gasoline fuel tank of the vehicle outside the container.

[Comparative example]
The same operation as in the example was performed except that gasoline vapor was discharged and not adsorbed by the circulation blower (9).

<Test results>

  The outside air temperature (outside the container) changed from 15.1 to 17.9 ° C. for 0 to 71 minutes.

1 is a schematic diagram of an apparatus used in Example 1. 2 is a schematic diagram of an apparatus used in Example 2. It is a figure which shows the measurement position of the temperature and gasoline concentration in Examples 1-2 and a comparative example. It is a perspective view of a booth. It is a top view of a booth.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Booth 2 Vehicle 3 Heating device 4 Gas flow device 5 Discharge conduit 6 Suction conduit 7 Suction conduit 7 Adsorption tank 8 Activated carbon 9 Gas fluidizer 10 Anemo master 11 Suction conduit 12 Discharge conduit 13 Gasoline tank screw cap 14 Gas discharge conduit 15 Snake tube 16 Cooling vessel 17 Tedlar Back 18 Conduit 19 Floor 20 Carry In / Out 21 Front Wall 22 Rear Wall 23 Side Wall 24 Roof 25 Boiler 26 Steam Header 27 Steam Heat Exchange Coil 28 Circulation Fan 29 Gas Suction Port 30 Steam Piping System 31 Gas Circulation Piping system

Claims (13)

A method of storing a vehicle in a booth, heating gas in the booth, and killing pests attached to the vehicle, heating the gas in the booth while discharging gasoline vapor. The method according to claim 1, wherein the gasoline vapor is discharged by discharging the gas in the booth. The method according to claim 2, wherein the exhausted gas is brought into contact with an adsorbent to remove gasoline. The method according to claim 3, wherein the gas which has been brought into contact with the adsorbent and from which gasoline has been removed is returned to the booth. 4. The method according to claim 3, wherein the contact time between the gas and the adsorbent is 0.1 minute to 3 hours, and the superficial velocity (SV value) of the gas is 0.2 to 2.0 m / s. The method of claim 3, wherein the adsorbent is activated carbon. The method according to claim 6, wherein the activated carbon has 30 to 70% mesopores and the mesopore diameter is 3 to 500 mm. The method according to claim 1, wherein the gasoline vapor is discharged by connecting a conduit to a gasoline tank of a vehicle. 9. The method according to claim 8, wherein a conduit is connected to the filling port of the gasoline tank. 9. The process according to claim 8, which is carried out by connecting a conduit to the atmospheric release system of the gasoline tank. 9. A process according to claim 8, wherein the gasoline vapor discharged from the conduit is removed by adsorption or cooling. The method of Claim 1 which maintains the temperature of the gas in a booth at 50-80 degreeC for 5 minutes-1 hour. The method according to claim 1, wherein the gasoline concentration in the booth is maintained at 300 ppm or less.

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