JPH07174297A - Washing processing method of residual gas in liquefied petroleum gas cylinder - Google Patents

Abstract

PURPOSE:To enable of disposal of residual gas without discharging the malodor of pollution outside at the time of washing residual gas in a gas cylinder by injection- filling liquefied gas into the residual gas in the gas cylinder to be reinspected so as to dissolve residue in the liquified gas, and then recovering this into a storage tank to wash the inside of the cylinder. CONSTITUTION:In the case of washing to remove residual gas in a used liquefied petroleum gas cylinder, the pressure of a primary storage tank is constantly lowered, and gas is sucked from the primary storage tank by a compressor to compress it. The compressed gas is then condensed and liquified to be sent to a secondary storage tank, and repeated operation is performed. Only the good quality gas out of soiled liquefied gas in the primary storage tank is thereby vaporized and condensed, transferred to the secondary storage tank, and liquefied material containing much reside is left in the primary storage tank. This residue is taken out into another cylinder and completely burnt in an incinerator. A small quantity of liquefied gas is injection- filled into the empty cylinder from a liquid line 1 through a valve 2, and after dissolving the residue again in the liquefied gas, this is recovered to wash the inside of the cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a treatment method for cleaning and removing residual gas in a used liquefied petroleum gas container.

[Prior Art] Most of the containers conventionally brought to a container inspection place are almost empty of liquid gas, and often only gaseous gas. The residue inside the container remains attached to the bottom part of the container, and it is difficult to remove it, but when it is filled with water, it floats, and it suffers from water pollution and odor. Especially in the recent LP gas, there are many twin supply systems and the automatic switching device uses the gas until it is completely empty. However, if the container is not completely cleaned at the time of inspection in a nearly empty state, it burns with a bad odor. There are many problems that are mistaken for gas leaks.

[Problems to be Solved by the Invention] As described in the prior art, when the conventional method is used, the removal of the residues in the vessel is accompanied by unsaturated hydrogenated petroleum, especially butadiene, in the components of the LP gas. It contains a small amount of sulfur or acetylene and produces the following drains and solids. That is, 1. Butadiene (monomer polymer) 2. Butadiene polymer (liquid butadiene) 3. Butadiene oxide (solid) 4. Pentane 5. Sulfur gum The above was used after vaporizing liquefied petroleum gas. The so-called empty container is repeatedly used for a period of filling the container (4 to 6 years) while being attached to the inside of the container. As a result, the inside of the container is gradually contaminated and becomes a source of generation of malodor, which has many problems. In order to solve such a problem, the present invention aims to treat the generated foul-smelling odor without releasing it to the outside, and an object of the present invention is to provide a method for burying it. In the High Pressure Gas Control Act,
Inspection of gas containers is strictly regulated, and expired containers that have been repeatedly filled for 4 to 6 years are brought to a container re-inspection site to recover residual gas with problems. The removal and cleaning of the residue is an important issue in this field.

(Means for Solving the Problems) In order to achieve the above object, in the residual gas removal treatment method of the present invention, a valve (2) is inserted into an empty container from the liquid line (1) in FIG. A small amount (5 to 10 l) of liquid gas is injected and injected through (1) to dissolve the residue again in the liquid gas. Then this is shown in FIG.
The inside of the container can be washed by collecting in the primary storage tank of No. 2.

(Embodiment) An embodiment will be described with reference to the drawings. In the drawing, FIG. 2-2 shows a differential pressure type recovery system using a compression unit, in which the pressure of the primary storage tank is constantly lowered and a compressor is used. Gaseous gas is sucked from the primary storage tank, compressed, further condensed and liquefied, and sent to the secondary storage tank for repeated operation.
Therefore, of the dirty liquid gas stored in the primary storage tank, only the good quality gas is vaporized and condensed and transferred to the secondary storage tank. Will remain. This is taken out into another container and completely burned in an incinerator. Regarding the results of the above method, it was proved that the result of the experiment was effective by developing and adopting the cleaning device for the residual gas recovery device of the conventional container inspection place in 1982. The gas currently used is mainly city gas and liquefied petroleum gas, and its usage is mainly for domestic use, commercial use, industrial use, medical use, etc., but recently the use range of LPG has expanded. The safety has been completed. Most of the recent LP gas has a twin supply system, and the gas is used by the automatic switching device until it is completely empty, or in the case of a container that is not completely cleaned in a nearly empty state, it burns with a bad odor and leaks gas. There are many misunderstandings. The present invention has been completed in order to eliminate the above-mentioned conventional drawbacks, and it is clear from the demonstration that the effect of the present invention is great. In the series of steps of the present invention, first, the inspection container data must be registered by the handy terminal of the recovery container, and secondly, the operation process is buried in the terminal display, the third is the appearance inspection, 4) Residual gas recovery, 5) valve removal, 6) pressure resistance test, 7) polishing the outside of the container, 8) secondary appearance inspection, and proceeding in order to clean the gas liquid. Is performed together with the evacuation of the gas fraction when recovering the fourth residual gas.
Although the present invention mainly focuses on the treatment using a compressor, it is also possible to utilize a pump.

(Effects of the Invention) Since the present invention is configured as described above, it has the effects described below.

1. Conventionally, the location condition of the liquefied petroleum gas container re-inspection site is remote, but by adopting the method of the present invention while the existing inspection station is gradually becoming a downtown area, it can be used as a countermeasure for the rehabilitation of facilities by removing bad odors. It is suitable for pollution prevention because it has the effect of being able to respond sufficiently.

2. After passing the inspection, the container is refilled with gas and used in general households, etc., but since the inside of the container is completely cleaned, troubles due to bad odor will be eliminated even when using gas combustion.

[Brief description of drawings]

[FIG. 1] shows the steps of the conventional residual gas treatment system,
The dotted line shows the new process of the present invention. [Fig. 2] is L
In the PG container re-inspection process chart, the internal liquid cleaning portion indicated by a thick frame in the figure is the position of the residual gas treatment process. [Explanation of symbols] 1 ……………… Liquid line 2 ……………… Valve

Claims (2)

[Claims] 1. A residual gas in a gas container to be re-examined is supplied from a liquid line (1) through a valve (2) into a liquid gas of 5 to 10.
After injecting about 1 l to dissolve the residue in the liquid gas,
A method for treating residual gas in a liquefied petroleum gas container, which is characterized by recovering in a storage tank and cleaning the inside of the container to completely clean the residual gas in the container. 2. The residual gas self-treatment method according to claim 1, wherein only the residue collected in claim 1 is taken out and completely burned in an incinerator to obtain a pollution-free effect.