Vapor recovery device

Abstract

The invention provides a vapor collecting device which enables the absorbent to reach saturation without desorbing the absorbent with abundant absorption capability, and will not discharge the petrol vapor into the atmosphere. In the invention, a first pump (19) is mounted on the recovering pipe (15) of the filler nozzle (8) with a front end opening (17), the recovering pipe (15) passes through the concentration slot (20) and is opened in the gas-liquid separation chamber (21), the gas-liquid separation chamber (21) is in connection with the first or the second absorption tower (33, 34), the second pump is mounted on the circulation pipe (48) in connection with the first or the second absorption tower (33, 34), the circulation pipe (48) is in connection with the absorption side of the first pump (19), and the control device (14) performs switching between the absorption step and the desorption step.

Description

technical field [0001] The present invention relates to a vapor recovering device installed at a gas station for adding fuel oil to automobiles to recover gasoline vapor flowing out of the fuel tank of the automobile during refueling. Background technique [0002] Fuel oil such as gasoline is highly volatile, and when the fuel tank of an automobile is refueled, gasoline vapor flows out of the fuel tank in proportion to the amount of refueling. If this gasoline vapor is released into the atmosphere, not only will resources be wasted, but also there is a danger of fire due to ignition and the possibility of causing environmental pollution. [0003] In order to cope with such problems, it is proposed to recover the gasoline vapor flowing out of the fuel tank during refueling, to condense and liquefy the gasoline vapor, to adsorb the non-liquefiable gasoline vapor on the adsorbent, and to discharge the gas without gasoline vapor into the atmosphere. vapor recovery device (refer...

AI Technical Summary

Problems solved by technology

[0005] However, the amount of fuel (flow rate) to be refueled is not uniform throughout the refueling time. During refueling, the flow rate may be high or the flow rate may be throttled (low flow rate).

[0006] For example, if refueling is carried out for a long time with a high flow rate of refueling, the amount of gasoline vapor generated will also increase, and there is a stage before the adsorbent is desorbed, the adsorbent is saturated, gasoline vapor is not adsorbed, and the gasoline is desorbed. Potential for vapor release to atmosphere

[0007] On the other hand, in the case of refueling in which the flow rate of refueling is throttled for a long time, there is a problem of switching to the desorption process even if the adsorption capacity of the adsorbent is sufficient.

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