阅读说明：本技术 一种低温气瓶的气体回收装置 (Gas recovery device of low-temperature gas cylinder ) 是由 林定标 王培正 陈辉 于 2019-11-27 设计创作，主要内容包括：本发明提供了一种低温气瓶的气体回收装置,属于低温气瓶充装技术领域。它解决了现有低温气瓶充装时气体挥发等技术问题。低温气瓶包括瓶体,瓶体上分别设有液相阀和气相阀,瓶体的液相阀用于连接低温液体充装管道；本气体回收装置包括低温液体储罐,低温液体储罐与空分设备通过低温液体管相连通且空分设备能够通过低温液体管向低温液体储罐内供给低温液体；低温液体储罐与瓶体的气相阀通过蒸发回气管道相连通。本发明中利用空分连续生产的低温液体来回收低温气瓶充装排放的气体,整个结构较为简单,制造成本低,且能够同时对应多个充装的低温气瓶,占用空间小,使用方便。(The invention provides a gas recovery device of a low-temperature gas cylinder, and belongs to the technical field of filling of low-temperature gas cylinders. It has solved the gaseous technical problem such as volatilize when current low temperature gas cylinder fills dress. The low-temperature gas cylinder comprises a cylinder body, a liquid phase valve and a gas phase valve are respectively arranged on the cylinder body, and the liquid phase valve of the cylinder body is used for connecting a low-temperature liquid filling pipeline; the gas recovery device comprises a low-temperature liquid storage tank, wherein the low-temperature liquid storage tank is communicated with an air separation plant through a low-temperature liquid pipe, and the air separation plant can supply low-temperature liquid into the low-temperature liquid storage tank through the low-temperature liquid pipe; the low-temperature liquid storage tank is communicated with the gas phase valve of the bottle body through an evaporation gas return pipeline. The invention utilizes the low-temperature liquid produced by air separation and continuous production to recover the gas filled and discharged by the low-temperature gas cylinder, has simpler whole structure and low manufacturing cost, can simultaneously correspond to a plurality of filled low-temperature gas cylinders, occupies small space and is convenient to use.)

1. A gas recovery device of a low-temperature gas cylinder comprises a cylinder body (1), wherein a liquid phase valve (1a) and a gas phase valve (1b) are respectively arranged on the cylinder body (1), and the liquid phase valve (1a) of the cylinder body (1) is used for being connected with a low-temperature liquid filling pipeline (2); the gas recovery device is characterized by comprising a low-temperature liquid storage tank (3), wherein the low-temperature liquid storage tank (3) is communicated with an air separation plant through a low-temperature liquid pipe (4), and the air separation plant can supply low-temperature liquid into the low-temperature liquid storage tank (3) through the low-temperature liquid pipe (4); the low-temperature liquid storage tank (3) is communicated with the gas phase valve (1b) of the bottle body (1) through an evaporation gas return pipeline (5).

2. The gas recovery device of a low-temperature gas cylinder according to claim 1, wherein the low-temperature liquid storage tank (3) comprises a tank body (3a), a liquid inlet valve (3b) and a gas inlet valve (3c) are respectively arranged on the tank body (3a), one end of the evaporation gas return pipeline (5) is connected with the gas inlet valve (3c), and the other end of the evaporation gas return pipeline (5) is connected with the gas phase valve (1 b).

3. The gas recovery device of a cryogenic gas cylinder according to claim 2, characterized in that each cryogenic liquid storage tank (3) corresponds to a plurality of cryogenic gas cylinders; the low-temperature liquid filling pipeline (2) is divided into a plurality of groups of filling branch pipes (21) through multi-way joints, and each group of filling branch pipes (21) is correspondingly connected with a liquid phase valve (1a) of the low-temperature gas cylinder; the evaporation gas return pipeline (5) is divided into a plurality of groups of evaporation gas return branch pipes (51) through a multi-way joint, and the gas phase valve (1b) of each low-temperature gas cylinder is connected with one group of evaporation gas return branch pipes (51).

4. Gas recovery device of a cryogenic gas cylinder according to claim 3, characterized in that the filling branch (21) and the return gas branch (51) are cryogenic hoses.

5. The gas recovery device of a cryogenic gas cylinder according to claim 1 or 2 or 3 or 4, characterized in that the cryogenic liquid storage tank (3) is a double-layer heat insulation structure; the low-temperature liquid filling pipeline (2) and the evaporation gas return pipeline (5) are vacuum heat insulation pipes.

Technical Field

The invention belongs to the technical field of filling of low-temperature gas cylinders, and relates to a gas recovery device of a low-temperature gas cylinder.

Background

In the prior art, welded insulated gas cylinders for low pressure liquid storage have great advantages both in terms of fill weight and end use compared to conventional gas cylinders for high pressure gas storage. Therefore, cryogenic gas cylinders are increasingly in common use. The low-temperature gas cylinder is generally connected with a low-temperature liquid storage tank through a metal hose, and the low-temperature liquid is filled by utilizing the pressure difference between the low-temperature liquid storage tank and the low-temperature gas cylinder. Because the metal hose can not insulate heat, the low-temperature liquid is gasified in a large amount, the pressure of the low-temperature gas cylinder is increased continuously, in order to keep the pressure difference between the low-temperature liquid storage tank and the low-temperature gas cylinder, the gas with the continuously increased pressure in the low-temperature gas cylinder needs to be released at any time in the filling process to relieve the pressure, a large amount of gas is wasted, the filling time is prolonged, and the potential safety hazard and the loss of gas cold quantity are increased.

Chinese patent (publication number: CN 207880437U; publication date: 2018-09-18) discloses a cold energy recovery device of a low-temperature high-pressure hydrogen storage cylinder, which is arranged in a double-layer hydrogen storage cylinder comprising an inner container and a shell and comprises a heat exchange pipeline and a flow control valve, wherein the heat exchange pipeline is arranged at two sides of a hydrogen outlet pipeline, the flow control valve is arranged at the cylinder mouth of the shell of the cylinder, and the heat exchange pipeline and the gas outlet pipeline are led out of the cylinder through the flow control valve; the heat exchange pipeline is arranged in a W shape in the inner container of the gas cylinder and adopts a fin structure; the flow control valve controls the flow of the gas outlet pipeline; the flow control valve is also communicated with a vacuum pumping pipeline and a vacuum measuring pipeline, and the vacuum pumping pipeline and the vacuum measuring pipeline are arranged on a vacuum heat insulation interlayer between the shell and the inner container.

In the above patent document, the vacuum heat insulating layer is arranged on the double-layer hydrogen storage cylinder, the structure of the cylinder is improved, and although cold quantity can be recovered to a certain degree, the structure of the whole cylinder is complex, the manufacturing cost is high, and the volume of the cylinder with unit storage capacity is large, and the occupied space is large.

Disclosure of Invention

The invention provides a gas recovery device of a low-temperature gas cylinder aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to efficiently and conveniently recover gas in the gas charging process of the low-temperature gas cylinder and ensure the structural compactness of the low-temperature gas cylinder.

The purpose of the invention can be realized by the following technical scheme:

a gas recovery device of a low-temperature gas cylinder comprises a cylinder body, wherein a liquid phase valve and a gas phase valve are respectively arranged on the cylinder body, and the liquid phase valve of the cylinder body is used for connecting a low-temperature liquid filling pipeline; the gas recovery device is characterized by comprising a low-temperature liquid storage tank, wherein the low-temperature liquid storage tank is communicated with an air separation plant through a low-temperature liquid pipe, and the air separation plant can supply low-temperature liquid into the low-temperature liquid storage tank through the low-temperature liquid pipe; the low-temperature liquid storage tank is communicated with the gas phase valve of the bottle body through an evaporation gas return pipeline.

The working principle is as follows: when the low-temperature gas cylinder is filled, liquid enters from a liquid phase valve of the low-temperature gas cylinder, when the liquid enters the low-temperature gas cylinder, the temperature of part of the liquid in the cylinder body rises and is vaporized, the pressure in the cylinder body rises due to the reduction of the volume in the cylinder body, and the vaporized gas is discharged from a gas phase valve of the cylinder body and enters a low-temperature liquid storage tank through a vapor return pipeline. The low-temperature liquid storage tank is at low temperature and normal pressure, and the air separation equipment supplies low-temperature liquid into the low-temperature liquid storage tank through a low-temperature liquid pipe; the low-temperature liquid produced by air separation contacts with the recovered low-temperature gas thermal mass, and the low-temperature gas is liquefied into liquid which is stored in a low-temperature liquid storage tank; the gas in the filling process is recycled, the whole structure is simpler, the manufacturing cost is low, a plurality of filled low-temperature gas cylinders can be simultaneously corresponded, the occupied space is small, and the use is convenient; the low-temperature liquid produced by air separation continuously is utilized to recover the gas discharged by filling the low-temperature gas cylinder, and a small filling workshop can generate 30 ten thousand yuan per year.

In the gas recovery device of the low-temperature gas cylinder, the low-temperature liquid storage tank comprises a tank body, a liquid inlet valve and a gas inlet valve are respectively arranged on the tank body, one end of the evaporation gas return pipeline is connected with the gas inlet valve, and the other end of the evaporation gas return pipeline is connected with the gas phase valve.

In the above gas recovery device for cryogenic gas cylinders, each cryogenic liquid storage tank corresponds to a plurality of cryogenic gas cylinders; the low-temperature liquid filling pipeline is divided into a plurality of groups of filling branch pipes through multi-way joints, and each group of filling branch pipes is correspondingly connected with a liquid phase valve of the low-temperature gas cylinder; the evaporation gas return pipeline is divided into a plurality of groups of evaporation gas return branch pipes through a multi-way joint, and a gas phase valve of each low-temperature gas cylinder is connected with one group of evaporation gas return branch pipes.

In the gas recovery device for the low-temperature gas cylinder, the charging branch pipe and the evaporation return gas branch pipe are low-temperature hoses.

In the gas recovery device of the low-temperature gas cylinder, the low-temperature liquid storage tank is of a double-layer heat insulation structure; the low-temperature liquid filling pipeline and the evaporation gas return pipeline are vacuum heat insulation pipes.

Compared with the prior art, the low-temperature gas cylinder filling device has the advantages that the low-temperature liquid produced by air separation continuous production is utilized to recover the gas filled and discharged by the low-temperature gas cylinder, the whole structure is simpler, the manufacturing cost is low, the low-temperature gas cylinder filling device can simultaneously correspond to a plurality of low-temperature gas cylinders, the occupied space is small, and the use is convenient.

Drawings

FIG. 1 is a schematic view of the structure of the gas recovery apparatus.

In the figure, 1, a bottle body; 1a, a liquid phase valve; 1b, a gas phase valve; 2. a cryogenic liquid filled conduit; 21. filling a branch pipe; 3. a cryogenic liquid storage tank; 3a, a tank body; 3b, a liquid inlet valve; 3c, an intake valve; 4. a low temperature liquid pipe; 5. an evaporation air return pipeline; 51. evaporating the return air branch pipe.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the cryogenic gas cylinder comprises a cylinder body 1, a liquid phase valve 1a and a gas phase valve 1b are respectively arranged on the cylinder body 1, and the liquid phase valve 1a of the cylinder body 1 is used for connecting a cryogenic liquid filling pipeline 2; the gas recovery device comprises a low-temperature liquid storage tank 3, wherein the low-temperature liquid storage tank 3 is communicated with an air separation plant through a low-temperature liquid pipe 4, and the air separation plant can supply low-temperature liquid into the low-temperature liquid storage tank 3 through the low-temperature liquid pipe 4; the low-temperature liquid storage tank 3 is communicated with the gas phase valve 1b of the bottle body 1 through an evaporation gas return pipeline 5. Further, the low-temperature liquid storage tank 3 comprises a tank body 3a, a liquid inlet valve 3b and an air inlet valve 3c are respectively arranged on the tank body 3a, one end of the evaporation air return pipeline 5 is connected with the air inlet valve 3c, and the other end of the evaporation air return pipeline 5 is connected with the gas phase valve 1 b; each low-temperature liquid storage tank 3 corresponds to a plurality of low-temperature gas cylinders; the low-temperature liquid filling pipeline 2 is divided into a plurality of groups of filling branch pipes 21 through multi-way joints, and each group of filling branch pipes 21 is correspondingly connected with a liquid phase valve 1a of a low-temperature gas cylinder; the evaporation gas return pipeline 5 is divided into a plurality of groups of evaporation gas return branch pipes 51 through multi-way joints, and the gas phase valve 1b of each low-temperature gas cylinder is connected with one group of evaporation gas return branch pipes 51; the filling branch pipe 21 and the evaporation return gas branch pipe 51 are low-temperature hoses; the low-temperature liquid storage tank 3 is of a double-layer heat insulation structure; the cryogenic liquid-filled conduit 2 and the boil-off gas conduit 5 are vacuum insulated pipes.

When the low-temperature gas cylinder is filled, liquid enters from the liquid phase valve 1a of the low-temperature gas cylinder, when the liquid enters the low-temperature gas cylinder, the temperature of part of the liquid in the bottle body 1 rises and is vaporized, the volume in the bottle body 1 is reduced to cause the pressure to rise, and the vaporized gas is discharged from the gas phase valve 1b of the bottle body 1 and enters the low-temperature liquid storage tank 3 through the evaporation gas return pipeline 5. The low-temperature liquid storage tank 3 is at low temperature and normal pressure, and the air separation equipment supplies low-temperature liquid into the low-temperature liquid storage tank 3 through a low-temperature liquid pipe 4; the low-temperature liquid produced by air separation contacts with the recovered low-temperature gas thermal mass, and the low-temperature gas is liquefied into liquid and stored in a low-temperature liquid storage tank 3; the gas in the filling process is recycled, the whole structure is simpler, the manufacturing cost is low, a plurality of filled low-temperature gas cylinders can be simultaneously corresponded, the occupied space is small, and the use is convenient; the low-temperature liquid produced by air separation continuously is utilized to recover the gas discharged by filling the low-temperature gas cylinder, and a small filling workshop can generate 30 ten thousand yuan per year.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although 1, the vial is used more herein; 1a, a liquid phase valve; 1b, a gas phase valve; 2. a cryogenic liquid filled conduit; 21. filling a branch pipe; 3. a cryogenic liquid storage tank; 3a, a tank body; 3b, a liquid inlet valve; 3c, an intake valve; 4. a low temperature liquid pipe; 5. an evaporation air return pipeline; 51. evaporation return manifold, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.