Device capable of recycling flash steam of liquid oxygen storage tank

Abstract

The utility model relates to a device capable of recovering flash gas in a liquid oxygen storage tank, which belongs to the technical field of liquid oxygen storage equipment and is used for recovering flash gas in the liquid oxygen storage tank. According to the technical scheme, an oxygen compressor is connected with a storage tank through a gas conveying pipeline, a safety discharge valve is installed at the top of the storage tank, a stop valve and a safety valve are installed in the gas conveying pipeline, the upper end of a recovery pipeline is connected to the top of the storage tank 1, and the lower end of the recovery pipeline is connected to the gas conveying pipeline between the stop valve and the safety valve; a low-temperature compressor, an exhaust valve and a check valve are additionally arranged on the gas conveying pipeline between the safety valve and a connecting point at the upper end of the recycling pipeline, a recycling adjusting valve is additionally arranged on the gas conveying pipeline between the connecting point at the upper end of the recycling pipeline and the storage tank, and a bypass valve is installed in the recycling pipeline. The flash evaporation waste gas recovery device is simple in structure, convenient to use and good in effect, flash evaporation waste gas in the storage tank can be recovered, the problem of discharge of flash evaporation gas of the storage tank is effectively solved, the effects of saving energy and reducing consumption are achieved, and economic benefits of enterprises are improved.

Description

Technical Field

[0001] This utility model relates to a device for directly pressurizing and recovering waste oxygen emitted during the operation of a liquid oxygen storage tank and converting it into liquid oxygen, belonging to the technical field of liquid oxygen storage equipment. Background Technology

[0002] Liquid oxygen has a wide range of applications. As a cryogenic liquid, it exists between -183℃ and 184℃ and requires large air separation liquid storage tanks for storage. During normal operation, although the liquid storage tank and gas pipeline are insulated, heat inevitably enters. This heat causes slight evaporation of the liquid inside the tank. Furthermore, during the filling process from the internal components of the tower into the tank and the cryogenic storage process, liquid oxygen flash evaporation is unavoidable. Currently, in the use of large air separation liquid storage tanks, the gas generated by liquid oxygen flash evaporation is discharged through an outlet pipe via a discharge valve or pressure relief valve to ensure constant pressure operation of the liquid storage tank. This released oxygen can be recovered and condensed back into liquid oxygen after cooling. If the oxygen released into the atmosphere can be converted into liquid oxygen, the cost will be lower than that of liquid oxygen produced by the air separation unit. This not only recovers oxygen and increases liquid oxygen production but also avoids the resource waste caused by oxygen release. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a device that can recover flash vapor from liquid oxygen storage tanks. This recovery device can recover the flash vapor from the storage tank into the air separation liquid storage tank, avoiding the waste of resources caused by oxygen release, increasing the liquid oxygen storage capacity, and improving the economic benefits of enterprises.

[0004] The technical solution to the above technical problem is:

[0005] An apparatus for recovering flash vapor from a liquid oxygen storage tank includes a storage tank, an oxygen compressor, and a gas transmission pipeline. The oxygen compressor is connected to the storage tank via the gas transmission pipeline. A safety discharge valve is installed on the top of the storage tank. A shut-off valve and a safety valve are installed in the gas transmission pipeline. The improvement is that a recovery pipeline is added. The upper end of the recovery pipeline is connected to the top of the storage tank, and the lower end of the recovery pipeline is connected to the gas transmission pipeline between the shut-off valve and the safety valve. A cryogenic compressor, an exhaust valve, and a check valve are added to the gas transmission pipeline between the upper end of the safety valve and the upper end of the recovery pipeline. A recovery regulating valve is added to the gas transmission pipeline between the upper end of the recovery pipeline and the storage tank. A bypass valve is installed in the recovery pipeline.

[0006] The aforementioned device for recovering flash vapor from a liquid oxygen storage tank includes a pressure gauge installed in the storage tank and a pressure gauge installed on the gas transmission pipeline between the check valve and the upper connection point of the recovery pipeline.

[0007] The beneficial effects of this utility model are:

[0008] This invention adds a cryogenic compressor, an exhaust valve, and a check valve to the original gas transmission pipeline. A recovery pipeline is added between the storage tank and the gas transmission pipeline, and a bypass valve is installed in the recovery pipeline. A recovery regulating valve is also added to the gas transmission pipeline between the storage tank and the recovery pipeline connection point. These valves can be replaced individually. The recovery regulating valve, check valve, exhaust valve, and pressure gauge ensure safe operation. The flash vapor in the storage tank can be returned to the gas transmission pipeline for recovery through the recovery regulating valve and recovery pipeline. This effectively solves the problem of flash vapor emission from the storage tank, achieves energy saving and consumption reduction, improves the working environment, and enhances the economic benefits of the enterprise. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] The following are marked in the diagram: Storage tank 1, oxygen compressor 2, gas pipeline 3, safety discharge valve 4, shut-off valve 5, safety valve 6, recovery pipeline 7, cryogenic compressor 8, exhaust valve 9, check valve 10, recovery regulating valve 11, bypass valve 12, pressure gauge 13. Detailed Implementation

[0011] This utility model consists of a gas transmission pipeline 3, a safety discharge valve 4, a shut-off valve 5, a safety valve 6, a recovery pipeline 7, a cryogenic compressor 8, an exhaust valve 9, a check valve 10, a recovery regulating valve 11, a bypass valve 12, and a pressure gauge 13.

[0012] The diagram shows that a shut-off valve 5 and a safety valve 6 are installed in the existing gas pipeline 3 to control the liquid oxygen delivered by the oxygen compressor 2 to the storage tank 1. At the same time, a safety discharge valve 4 is installed on the top of the storage tank 1 to discharge the flash gas accumulated in the storage tank 1.

[0013] As shown in the figure, this utility model adds multiple valves to the gas transmission pipeline 3 between the storage tank 1 and the oxygen compressor 2, and adds a recovery pipeline 7 between the storage tank 1 and the gas transmission pipeline 3. The flash gas in the storage tank 1 is transported to the gas transmission pipeline 3 through the recovery pipeline 7, and then transported back to the storage tank 1 by the gas transmission pipeline 3, thus realizing recovery.

[0014] The diagram shows that the upper end of the recovery pipe 7 is connected to the top of the storage tank 1, and the lower end of the recovery pipe 7 is connected to the gas transmission pipe 3 between the original shut-off valve 5 and safety valve 6. A cryogenic compressor 8 is added to the gas transmission pipe 3 between the safety valve 6 and the upper connection point of the recovery pipe 7 to increase the pressure of the recovered gas for long-distance transmission. An exhaust valve 9 and a check valve 10 prevent gas backflow from affecting the operating pressure of the storage tank in the event of a sudden equipment shutdown. A recovery regulating valve 11 is added to the gas transmission pipe 3 between the upper connection point of the recovery pipe 7 and the storage tank 1 to regulate the amount of recovered gas supplied to the storage tank. The regulating valve 11 is closed when the operating pressure of the storage tank is lower than the operating pressure, and opened when it is higher. When the inlet pressure of the cryogenic compressor 8 is lower than the design value, the recovery regulating valve 12 is used to adjust and prevent the inlet pressure of the cryogenic fan from being too low.

[0015] As shown in the figure, a pressure gauge 13 is installed in the storage tank 1, and a pressure gauge 13 is also installed on the gas transmission pipeline 3 between the connection point of the check valve 10 and the upper end of the recovery pipeline 7, for detecting the gas pressure in the storage tank 1 and the recovery pipeline 7.

[0016] The usage process of this utility model is as follows:

[0017] Open the exhaust valve 9 and the recovery regulating valve 11 to fully replace the inlet of the cryogenic fan in the recovery pipeline 7. Then open the shut-off valve 5, start the cryogenic compressor 8, and gradually close the bypass valve 12 to enter the oxygen compressor inlet pipeline 8. The pressure of the oxygen compressor inlet pipeline is about 10 kPa. The pressure is increased by the oxygen compressor and sent out.

[0018] The pressure of storage tank 1 is controlled by safety discharge valve 4, the flash vapor of storage tank 1 is recovered by recovery regulating valve 11, the pressure gauge 13 of gas pipeline 3 is observed, the gas pressure in gas pipeline 3 is controlled, and the gas pressure of storage tank 1 is controlled by safety discharge valve 4.

[0019] An embodiment of this utility model is as follows:

[0020] The diameter of storage tank 1 is 19000 mm and the height is 13800 mm;

[0021] The model of oxygen compressor 2 is T1YS502F;

[0022] The gas pipeline 3 has a diameter of 108 mm and a length of 30,000 mm;

[0023] The safety discharge valve 4 is model 347DA20, PN10;

[0024] The model number of the shut-off valve 5 is 347DA80, PN10;

[0025] Safety valve 6 is model DA42Y-16P;

[0026] The diameter of the recycling pipe 7 is 80mm and the length is 10000mm;

[0027] The model number of the cryogenic compressor 8 is ASP22016-010-RFQ;

[0028] The exhaust valve 9 is model number 347DA20, PN10;

[0029] The check valve 10 is model number DH61Y;

[0030] The model of the recovery regulating valve 11 is VSD-5235LA-RS (low temperature type) PN1.6MPa508380A80A;

[0031] The bypass valve 12 is model VSD-5235LA-RS (low temperature type) PN1.6MPa508380A80A;

[0032] The pressure gauge 13 is model EJA430E-JAS4G-92CDB.

Claims

1. An apparatus for recovering flash vapor from a liquid oxygen storage tank, comprising a storage tank (1), an oxygen compressor (2), and a gas transmission pipeline (3), wherein the oxygen compressor (2) is connected to the storage tank (1) via the gas transmission pipeline (3), a safety discharge valve (4) is installed on the top of the storage tank (1), and a shut-off valve (5) and a safety valve (6) are installed in the gas transmission pipeline (3), characterized in that: It adds a recovery pipe (7), the upper end of which is connected to the top of the storage tank (1), and the lower end of which is connected to the gas transmission pipe (3) between the shut-off valve (5) and the safety valve (6). A cryogenic compressor (8), an exhaust valve (9) and a check valve (10) are added to the gas transmission pipe (3) between the safety valve (6) and the upper end connection point of the recovery pipe (7). A recovery regulating valve (11) is added to the gas transmission pipe (3) between the upper end connection point of the recovery pipe (7) and the storage tank (1). A bypass valve (12) is installed in the recovery pipe (7).

2. The apparatus for recovering flash vapor from a liquid oxygen storage tank according to claim 1, characterized in that: The storage tank (1) is equipped with a pressure gauge (13), and the gas transmission pipeline (3) between the check valve (10) and the upper end connection point of the recovery pipeline (7) is also equipped with a pressure gauge (13).

Images