Waste gas recycling device of low-temperature liquid oxygen storage tank

Abstract

The utility model provides a waste gas recycling device of a low-temperature liquid oxygen storage tank, which belongs to the technical field of raw material recycling and comprises a liquid oxygen storage tank, a pressure relief device, an exhaust pipe, a first gas delivery pipe, a first air temperature type vaporizer, a second gas delivery pipe and a second air temperature type vaporizer. One end of the exhaust pipe penetrates through the opening in the bottom of the liquid oxygen storage tank, the other end of the exhaust pipe is fixedly connected with the second gas conveying pipe between the first air temperature type vaporizer and the second air temperature type vaporizer, and the first air temperature type vaporizer is connected with the opening in the bottom of the liquid oxygen storage tank through the first gas conveying pipe; and the second air temperature type vaporizer is connected with external aerobic equipment through a pipeline. According to the utility model, gaseous oxygen which is originally discharged to the outside is recycled, so that the use efficiency of raw materials is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of raw material recycling, and particularly relates to an exhaust gas recycling device for a low-temperature liquid oxygen storage tank. Background Art

[0002] As a common raw material for industrial production, oxygen is commonly stored in a pressurized liquid state in a tank. When in use, it is converted into a gaseous state through a pressure reduction and temperature increase process and then supplied to the workshop for production. Currently, one or more air-cooled vaporizers are usually connected in series according to the local environment to complete the pressure reduction and temperature increase processes of liquid oxygen. However, the oxygen gasified in the storage tank due to the increase in ambient temperature enters the atmosphere through the exhaust port reserved at the bottom of the storage tank for factory shipment, resulting in waste of raw materials and increased production costs. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to realize the recycling of the gasified oxygen that needs to be discharged in the liquid oxygen storage tank. In view of the deficiencies of the prior art, an exhaust gas recycling device for a low-temperature liquid oxygen storage tank is provided.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0005] An exhaust gas recycling device for a low-temperature liquid oxygen storage tank includes a liquid oxygen storage tank, a pressure relief device, an exhaust pipe, a first gas transmission pipe, a first air-cooled vaporizer, a second gas transmission pipe, and a second air-cooled vaporizer. The pressure relief device is provided at the center of the top of the liquid oxygen storage tank. One end of the exhaust pipe penetrates through the bottom opening of the liquid oxygen storage tank, and the other end is fixedly connected to the second gas transmission pipe between the first air-cooled vaporizer and the second air-cooled vaporizer. The first air-cooled vaporizer is connected to the bottom opening of the liquid oxygen storage tank through the first gas transmission pipe, and the second air-cooled vaporizer is connected to an external oxygen-consuming device through a pipeline.

[0006] Further, a safety valve and a second stop valve are installed on the exhaust pipe. The first gas transmission pipe is provided with a first stop valve, the second gas transmission pipe is provided with two first stop valves, and the interface between the exhaust pipe and the second gas transmission pipe is located between the two first stop valves.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0008] 1) Using an air-cooled vaporizer to reduce the pressure and increase the temperature of liquid oxygen saves the need for an external stable heat source for the oxygen state conversion, saves production costs, and has good practicability and environmental friendliness;

[0009] 2) Use an independent pipeline equipped with a safety valve to lead the gaseous oxygen in the liquid oxygen storage tank to the pipeline between two air-cooled vaporizers, mix it with the oxygen passing through the first air-cooled vaporizer, and then enter the second air-cooled vaporizer to further improve the overall gasification effect of oxygen;

[0010] 3) When the amount of gaseous oxygen generated in the liquid oxygen storage tank meets the production needs or the first air-cooled vaporizer is damaged, the oxygen can directly enter the second air-cooled vaporizer by closing the stop valve, which improves the fault tolerance and practicality of the device;

[0011] 4) The second air-cooled vaporizer plays a buffering role, providing a stable pressure reduction environment for the gaseous oxygen in the liquid oxygen storage tank, which is beneficial to reducing the impact on the oxygen-consuming equipment at the rear end and improving the equipment life and production safety. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0013] Among them, 1 - liquid oxygen storage tank, 11 - pressure relief device, 12 - exhaust pipe, 13 - gas transmission pipe, 2 - first air-cooled vaporizer, 21 - second gas transmission pipe, 3 - first stop valve, 4 - safety valve, 5 - second air-cooled vaporizer, 6 - second stop valve. Detailed Embodiments

[0014] To better understand the present invention, the content of the present invention will be further clearly described below in conjunction with embodiments. However, the protection scope of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0015] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0016] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] Example 1

[0018] Refer to Figure 1 , which includes a liquid oxygen storage tank 1, a pressure relief device 11, an exhaust pipe 12, a first gas transmission pipe 13, a first air-cooled vaporizer 2, a second gas transmission pipe 21, a first stop valve 3, a safety valve 4, a second air-cooled vaporizer 5 and a second stop valve 6. The pressure relief device 11 is provided at the center of the top of the liquid oxygen storage tank 1. One end of the exhaust pipe 12 penetrates through the bottom opening of the liquid oxygen storage tank 1, and the other end is fixedly connected to the second gas transmission pipe 21 between the first air-cooled vaporizer 2 and the second air-cooled vaporizer 5. A safety valve 4 and a second stop valve 6 are installed on the exhaust pipe 12. When the pressure value is higher than the set value, the safety valve 4 automatically opens to allow oxygen to enter the second air-cooled vaporizer 2 through the exhaust pipe 12. The first air-cooled vaporizer 2 is connected to the bottom opening of the liquid oxygen storage tank 1 through the first gas transmission pipe 13, and the first gas transmission pipe 13 is provided with a first stop valve 3. The second air-cooled vaporizer 5 is connected to an external oxygen-consuming device through a pipeline. The second gas transmission pipe 21 is provided with two first stop valves 3. The interface between the exhaust pipe 12 and the second gas transmission pipe 21 is located between the two first stop valves 3. A first stop valve 3 is installed between the second air-cooled vaporizer 5 and the subsequent oxygen-consuming device. When the device works, the first stop valve 3 and the second stop valve 6 are both opened, and the safety valve 4 is adjusted to the preset pressure value.

[0019] The technical solution provided by the embodiment of the present application guides the gaseous oxygen in the tank to the pipeline between the first and second air-cooled vaporizers through the exhaust pipe penetrating into the liquid oxygen storage tank, mixes with the oxygen passing through the first air-cooled vaporizer, and then passes through the second air-cooled vaporizer together, so that the temperature and pressure of the oxygen in different paths tend to be consistent, which is convenient for subsequent use at the production end. The gaseous oxygen that originally needed to be discharged into the atmosphere is recycled, improving the utilization rate of raw materials and having good economy.

[0020] Example 2

[0021] The waste gas recovery and utilization device of the low-temperature liquid oxygen storage tank according to the embodiment of the present utility model is different from that of Example 1 in that:

[0022] When the ambient temperature is relatively high, if the oxygen vaporized in the liquid oxygen storage tank 1 alone can meet the production demand or the first air-cooled vaporizer 2 needs to be overhauled, the first stop valves 3 at both ends of the first air-cooled vaporizer can be closed, so that only gaseous oxygen in the liquid oxygen storage tank 1 is discharged from the tank body and enters the second air-cooled vaporizer 5 through the exhaust pipe 12, and after buffering, decompression and temperature rise, it is output to the oxygen-consuming device, which can extend the service life of the first air-cooled vaporizer 2 and has practicality.

[0023] Finally, it should be noted that the above embodiments are only preferred embodiments of the present utility model, which are only used to illustrate the technical solutions of the present utility model rather than to limit them. Any modifications, improvements or other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present utility model, as long as they do not depart from the spirit and scope of the technical solutions of the present utility model, shall be included within the protection scope of the present utility model.

Claims

1. A waste gas recovery and utilization device for a cryogenic liquid oxygen storage tank, characterized in that: The invention comprises a liquid oxygen storage tank (1), a pressure relief device (11), an exhaust pipe (12), a first air supply pipe (13), a first air-temperature vaporizer (2), a second air supply pipe (21) and a second air-temperature vaporizer (5). The pressure relief device (11) is arranged at the top center of the liquid oxygen storage tank (1). One end of the exhaust pipe (12) penetrates through the bottom opening of the liquid oxygen storage tank (1), and the other end is fixedly connected to the second air supply pipe (21) between the first air-temperature vaporizer (2) and the second air-temperature vaporizer (5). The first air-temperature vaporizer (2) is connected to the bottom opening of the liquid oxygen storage tank (1) via the first air supply pipe (13), and the second air-temperature vaporizer (5) is connected to an external oxygen demanding device via a pipeline.

2. The waste gas recovery and utilization device of the cryogenic liquid oxygen storage tank according to claim 1, characterized in that: The exhaust pipe (12) is provided with a safety valve (4) and a second stop valve (6); the first gas supply pipe (13) is provided with a first stop valve (3); the second gas supply pipe (21) is provided with two of the first stop valves (3); and the interface between the exhaust pipe (12) and the second gas supply pipe (21) is located between the two first stop valves (3).

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