Emptying gas recovery device for oxygen production low-temperature liquid oxygen liquid nitrogen storage tank

Abstract

The utility model relates to the technical field of air recovery devices, and provides an oxygen production low-temperature liquid oxygen liquid nitrogen storage tank emptying gas recovery device which comprises a liquid storage tank body provided with an emptying opening. An air inlet of the air temperature vaporizer is communicated with the vent nozzle; a gas inlet of the gas compressor communicates with a gas outlet of the air temperature gasifier. By means of the technical scheme, the problem that in the prior art, no recovery device is provided for the emptying gas of the oxygen production low-temperature liquid oxygen liquid nitrogen storage tank is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas recovery devices, in particular to a venting gas recovery device for an oxygen-making low-temperature liquid oxygen and liquid nitrogen storage tank. Background Art

[0002] Cryogenic liquid oxygen and liquid nitrogen storage tanks are essential equipment in the industrial oxygen production process. However, these tanks inevitably emit a certain amount of gas during normal operation and maintenance. This vented gas typically contains valuable components such as oxygen and nitrogen. Large storage tanks are generally atmospheric pressure powder storage tanks, with a cryogenic liquid vaporization rate between 0.12% and 0.18%. The vaporized gas is discharged into the atmosphere through a vent valve at the top of the tank to maintain a stable tank pressure. The vented gas is not recovered, resulting in waste. With rising energy prices and increasingly stringent environmental protection requirements, the need to conserve energy and reduce emissions is becoming increasingly urgent. By recovering the valuable components in this vented gas, oxygen production costs can be reduced and resource utilization can be improved. Utility Model Content

[0003] The utility model provides a vent gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production, which solves the problem in the related art that there is no vent gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production.

[0004] The technical solution of the utility model is as follows:

[0005] A venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production, comprising:

[0006] a liquid storage tank body, wherein the liquid storage tank body has a drain port;

[0007] An air-temperature vaporizer, wherein the air inlet of the air-temperature vaporizer is connected to the vent;

[0008] A gas compressor, wherein the gas compressor air inlet is communicated with the air outlet of the air-temperature vaporizer.

[0009] Optionally, it also includes:

[0010] A pressure-stabilizing vent valve is provided, wherein the vent port is connected to the air inlet of the air-temperature vaporizer through the pressure-stabilizing vent valve.

[0011] Optionally, it also includes:

[0012] A pipeline vent valve, one end of which is connected to the pressure-stabilizing vent valve and is connected in parallel with the air inlet of the air-temperature vaporizer, and the other end of which is connected to the outside world.

[0013] Optionally, it also includes:

[0014] a first shutoff valve, through which the air inlet of the air-temperature vaporizer is connected to the pressure-stabilizing vent valve;

[0015] A second shut-off valve is provided, wherein the air outlet of the air temperature vaporizer is connected to the air inlet of the gas compressor through the second shut-off valve.

[0016] Optionally, it also includes:

[0017] A pipeline check valve, wherein the second shut-off valve is connected to the gas compressor inlet through the pipeline check valve.

[0018] Optionally, it also includes:

[0019] A heat collection cover is provided outside the gas compressor and is used to collect heat generated during operation of the gas compressor;

[0020] A fan is provided at the top of the heat collection cover and is connected to the top of the air temperature vaporizer 2. Optionally,

[0021] Also includes:

[0022] A nozzle is arranged on the top of the air temperature vaporizer and is connected to the heat collection cover.

[0023] Optionally, the nozzle comprises:

[0024] A fixed pipeline, one end of which is arranged on the top of the air-temperature vaporizer;

[0025] A first pipeline, wherein a first angle is formed between two end surfaces of the first pipeline, the first angle being α, and one end of the first pipeline being rotatably disposed on the other end of the fixed pipeline;

[0026] A second pipeline, wherein a second angle is formed between two end surfaces of the second pipeline, the second angle being β, and one end of the second pipeline is rotatably disposed on the other end of the first pipeline;

[0027] The third pipeline has a third angle between its two end faces, and the third angle is γ. One end of the third pipeline is rotatably arranged at the other end of the second pipeline. After the first pipeline, the second pipeline and the third pipeline are rotated, the third pipeline can face any direction inside the air-temperature vaporizer.

[0028] Optionally, the first angle is the same as the third angle, and the sum of the first angle and the third angle is the second angle.

[0029] The working principle and beneficial effects of the utility model are as follows:

[0030] In the present invention, in order to solve the problem that there is no recovery device for the vented gas of the low-temperature liquid oxygen and liquid nitrogen storage tank for oxygen production, a vented gas recovery device for the low-temperature liquid oxygen and liquid nitrogen storage tank for oxygen production is designed, which includes a liquid storage tank body, an air-temperature vaporizer and a gas compressor. Specifically, during the storage and use of the liquid oxygen and liquid nitrogen in the liquid storage tank body, the gas generated is discharged from the vent port. These vented gases directly enter the air-temperature vaporizer, where the temperature of the surrounding environment is used to heat the gas. If the unheated gas is directly introduced into the gas compressor, it will cause damage to the gas compressor. The heated gas then flows to the air inlet of the gas compressor. The gas compressor compresses the heated gas so that its pressure reaches a standard that can be reused or stored.

[0031] The advantage is that by recycling the vented gas from the cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production, the effective utilization of resources is achieved, the waste of gas is avoided, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0033] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0034] Figure 2 This is a schematic diagram of the nozzle structure of the utility model;

[0035] Figure 3 This is a schematic diagram of the structure of the nozzle after rotation of the utility model.

[0036] In the figure: 1. Liquid storage tank body, 101. Vent, 2. Air temperature vaporizer, 3. Gas compressor, 4. Pressure-stabilizing vent valve, 5. Pipeline vent valve, 6. First shut-off valve, 7. Second shut-off valve, 8. Pipeline check valve, 9. Heat collection cover, 10. Fan, 11. Nozzle, 1101. Fixed pipeline, 1102. First pipeline, 1103. Second pipeline, 1104. Third pipeline. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0038] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0039] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0040] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] Reference Figures 1 to 3 , which is the first embodiment of the utility model, proposes a venting gas recovery device for a low-temperature liquid oxygen and liquid nitrogen storage tank for oxygen production, including a liquid storage tank body 1, the liquid storage tank body 1 having a venting port 101; the air inlet of an air-temperature vaporizer 2 is connected to the venting port 101; the air inlet of a gas compressor 3 is connected to the air outlet of the air-temperature vaporizer 2.

[0042] In this embodiment, in order to solve the problem that there is no recovery device for the vented gas of the low-temperature liquid oxygen and liquid nitrogen storage tank for oxygen production, a vented gas recovery device for the low-temperature liquid oxygen and liquid nitrogen storage tank for oxygen production is designed, which includes a liquid storage tank body 1, an air-temperature vaporizer 2 and a gas compressor 3. Specifically, during the storage and use of the liquid oxygen and liquid nitrogen in the liquid storage tank body 1, the gas generated is discharged from the vent port 101. These vented gases directly enter the air-temperature vaporizer 2, where the temperature of the surrounding environment is used to heat the gas. If the unheated gas is directly introduced into the gas compressor 3, it will cause damage to the gas compressor 3. The heated gas then flows to the air inlet of the gas compressor 3. The gas compressor 3 compresses the heated gas so that its pressure reaches a standard that can be reused or stored.

[0043] The advantage is that by recycling the vented gas from the cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production, the effective utilization of resources is achieved, the waste of gas is avoided, and the production cost is reduced.

[0044] Furthermore, it also includes a pressure-stabilizing vent valve 4, and the vent port 101 is connected to the air inlet of the air-temperature vaporizer 2 through the pressure-stabilizing vent valve 4.

[0045] Furthermore, it also includes a pipeline vent valve 5, one end of the pipeline vent valve 5 is connected to the pressure-stabilizing vent valve 4 and is connected in parallel with the air inlet of the air-temperature vaporizer 2, and the other end of the pipeline vent valve 5 is connected to the outside world.

[0046] Furthermore, it also includes a first shut-off valve 6, through which the air inlet of the air-temperature vaporizer 2 is connected to the pressure-stabilizing vent valve 4; the air outlet of the air-temperature vaporizer 2 is connected to the air inlet of the gas compressor 3 through a second shut-off valve 7.

[0047] Furthermore, a pipeline check valve 8 is included, and the second shut-off valve 7 is connected to the air inlet of the gas compressor 3 through the pipeline check valve 8.

[0048] In this embodiment, the liquid storage tank body 1 generates vent gas during operation. These gases first pass through the pressure-stabilizing vent valve 4 at the vent port 101 for pressure stabilization and then enter the air-temperature vaporizer 2. Under special circumstances, such as when the air-temperature vaporizer 2 or the gas compressor 3 needs maintenance or fails, the gas can be directly discharged to the outside through the pipeline vent valve 5 to ensure the safety of the system. The first shut-off valve 6 provided in front of the air inlet of the air-temperature vaporizer 2 can cut off the gas from entering the air-temperature vaporizer 2, for example, when performing equipment maintenance or replacing parts. The gas heated by the air-temperature vaporizer 2 is controlled by the second shut-off valve 7 to control its flow direction, and then passes through the pipeline check valve 8 to prevent the gas from flowing back, and finally enters the air inlet of the gas compressor 3.

[0049] The advantage is that the pressure-stabilizing vent valve 4 ensures the stability of the vented gas pressure, making the entire recovery process smoother and reducing equipment damage and operational failures caused by pressure fluctuations. The provision of the pipeline vent valve 5 increases the flexibility of the system, and can quickly discharge gas in the event of equipment failure or emergency to ensure safety. The first shut-off valve 6 and the second shut-off valve 7 facilitate the separate maintenance and inspection of the air-temperature vaporizer 2 and the gas compressor 3 without affecting the normal operation of the entire production line. The pipeline check valve 8 effectively avoids the backflow of gas when the gas compressor 3 fails or shuts down, protecting the safety of the equipment and system. Through precise control and regulation of gas flow, the recovery device can operate efficiently under different working conditions, thereby improving the efficiency and quality of resource recovery.

[0050] Furthermore, it also includes a heat collection cover 9; the heat collection cover 9 is arranged on the outside of the gas compressor 3, for collecting the heat generated during the operation of the gas compressor 3; the fan 10 is arranged on the top of the heat collection cover 9, and the fan 10 is connected to the top of the air temperature vaporizer 2.

[0051] Furthermore, it also includes a nozzle 11, which is arranged on the top of the air-temperature vaporizer 2 and is connected to the heat collection cover 9.

[0052] In this embodiment, after the liquid storage tank body 1 generates vent gas, it enters the air-temperature vaporizer 2 through the vent port 101 and the pressure-stabilizing vent valve 4 for heating. When the gas compressor 3 is working, the heat collection cover 9 on the outside collects the heat generated by its operation. The fan 10 is started and the heat is transported to the nozzle 11 at the top of the air-temperature vaporizer 2 through the pipeline. The nozzle 11 sprays the heat evenly into the interior of the air-temperature vaporizer 2, thereby improving the efficiency of gas heating. For example, in the cold winter, the external ambient temperature is low, and the heat generated by the gas compressor 3 can effectively supplement the heat required by the air-temperature vaporizer 2, ensuring the smooth progress of the gas heating process.

[0053] The advantage is that the combination of the heat collection hood 9 and the fan 10 realizes the recovery and utilization of the waste heat generated by the gas compressor 3, improves the comprehensive utilization rate of energy, and reduces the energy consumption of the entire system. In a low-temperature environment, the heat of the compressor is used to assist the air-temperature vaporizer 2 in its operation, thereby enhancing the stable operation capability of the device under different climatic conditions. The additional energy input required to maintain the normal heating of the air-temperature vaporizer 2 is reduced, thereby reducing production costs. Heat is evenly sprayed into the nozzle 11, making the temperature distribution in the air-temperature vaporizer 2 more uniform and the gas heating effect more ideal. It embodies the concepts of energy conservation, emission reduction and resource recycling, meets the requirements of sustainable development, and helps enterprises reduce environmental impact. It improves the operational stability and reliability of the entire recovery device and reduces the adverse effects of changes in external ambient temperature on the gas heating process.

[0054] Furthermore, the nozzle 11 includes a fixed pipeline 1101, one end of which is arranged at the top of the air-temperature vaporizer 2; a first angle is provided between the two end surfaces of the first pipeline 1102, the first angle is α, and one end of the first pipeline 1102 is rotatably provided at the other end of the fixed pipeline 1101; a second angle is provided between the two end surfaces of the second pipeline 1103, the second angle is β, and one end of the second pipeline 1103 is rotatably provided at the other end of the first pipeline 1102; a third angle is provided between the two end surfaces of the third pipeline 1104, the third angle is γ, and one end of the third pipeline 1104 is rotatably provided at the other end of the second pipeline 1103. After the first pipeline 1102, the second pipeline 1103 and the third pipeline 1104 are rotated, the third pipeline 1104 can face any direction inside the air-temperature vaporizer 2.

[0055] Furthermore, the first angle is the same as the third angle, and the sum of the first angle and the third angle is the second angle.

[0056] In this embodiment, when the heat generated during the operation of the gas compressor 3 is transported to the nozzle 11 at the top of the air-temperature vaporizer 2 through the heat collection cover 9 and the fan 10, the nozzle 11 plays a key role. The fixed pipeline 1101 is firmly installed on the top of the air-temperature vaporizer 2. There are gear teeth on the first pipeline 1102, the second pipeline 1103, and the third pipeline 1104. At the same time, there are independent drive motors and transmission gears on the first pipeline 1102, the second pipeline 1103, and the third pipeline 1104. The transmission gears mesh with the gear teeth. When the different drive motors rotate, the corresponding gears are driven to rotate, so that the first pipeline 1102 can rotate relative to the fixed pipeline 1101, the second pipeline 1103 can rotate relative to the first pipeline 1102, and the third pipeline 1104 can also rotate relative to the second pipeline 1103. Based on the temperature requirements at different locations within air-temperature vaporizer 2, or due to equipment installation location and space limitations, first conduit 1102, second conduit 1103, and third conduit 1104 can be flexibly rotated so that third conduit 1104 can face any direction within air-temperature vaporizer 2, thereby achieving precise heat injection and uniform distribution. Assuming that first angle α and third angle γ are both 24°, and second angle β is 48°, this angle design allows nozzle 11 to better adapt to different injection requirements during rotation and adjustment.

[0057] The advantage is that, through the rotatable pipeline design, heat can be accurately directed to the position in the air-temperature vaporizer 2 that needs to be heated, achieving more precise temperature control and improving the gas heating effect. It is adaptable to different installation environments and the internal structure of the air-temperature vaporizer 2, and is convenient for adjusting the heat injection direction according to actual conditions. Heat can be effectively and evenly distributed inside the air-temperature vaporizer 2, avoiding local overheating or overcooling, and improving the efficiency and quality of gas heating. The special angle design makes the rotation of the pipeline and the heat injection more reasonable, further enhancing the performance and adaptability of the nozzle 11. Accurate heat injection reduces energy waste and reduces the operating cost of the entire recovery device. It ensures that under various complex working conditions, a stable and uniform heat supply can be provided to the air-temperature vaporizer 2, thereby improving the reliability and stability of the entire system.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank, characterized in that: include: A liquid storage tank body (1), wherein the liquid storage tank body (1) has a drain port (101); An air-temperature vaporizer (2), wherein an air inlet of the air-temperature vaporizer (2) is in communication with the vent (101); A gas compressor (3), wherein an air inlet of the gas compressor (3) is connected to an air outlet of the air-temperature vaporizer (2).

2. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 1 is characterized in that: Also includes: A pressure-stabilizing vent valve (4), wherein the vent port (101) is connected to the air inlet of the air-temperature vaporizer (2) through the pressure-stabilizing vent valve (4).

3. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 2 is characterized in that: Also includes: A pipeline vent valve (5), one end of which is connected to the pressure-stabilizing vent valve (4) and is connected in parallel to the air inlet of the air-temperature vaporizer (2), and the other end of which is connected to the outside world.

4. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 3 is characterized in that: Also includes: a first shutoff valve (6), wherein the air inlet of the air-temperature vaporizer (2) is connected to the pressure-stabilizing vent valve (4) via the first shutoff valve (6); A second shut-off valve (7), wherein the air outlet of the air-temperature vaporizer (2) is connected to the air inlet of the gas compressor (3) through the second shut-off valve (7).

5. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 4 is characterized in that: Also includes: A pipeline check valve (8), wherein the second shut-off valve (7) is connected to the air inlet of the gas compressor (3) through the pipeline check valve (8).

6. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 1 is characterized in that: Also includes: A heat collection cover (9); the heat collection cover (9) is arranged outside the gas compressor (3) and is used to collect heat generated during the operation of the gas compressor (3); A fan (10), the fan (10) is arranged on the top of the heat collection cover (9), and the fan (10) is connected to the top of the air-temperature vaporizer (2).

7. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 6, characterized in that: Also includes: A nozzle (11), wherein the nozzle (11) is arranged at the top of the air-temperature vaporizer (2) and is in communication with the heat collection cover (9).

8. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 7, characterized in that: The nozzle (11) comprises: A fixed pipeline (1101), one end of the fixed pipeline (1101) is arranged on the top of the air-temperature vaporizer (2); A first pipeline (1102), wherein a first angle is formed between two end surfaces of the first pipeline (1102), the first angle being α, and one end of the first pipeline (1102) is rotatably arranged at the other end of the fixed pipeline (1101); A second pipeline (1103), wherein a second angle is formed between two end surfaces of the second pipeline (1103), the second angle being β, and one end of the second pipeline (1103) is rotatably arranged at the other end of the first pipeline (1102); The third pipeline (1104) has a third angle between its two end faces, and the third angle is γ. One end of the third pipeline (1104) is rotatably arranged at the other end of the second pipeline (1103). After the first pipeline (1102), the second pipeline (1103) and the third pipeline (1104) are rotated, the third pipeline (1104) can face any direction inside the air-temperature vaporizer (2).

9. The venting gas recovery device for a cryogenic liquid oxygen and liquid nitrogen storage tank for oxygen production according to claim 8, characterized in that: The first angle is the same as the third angle, and the sum of the first angle and the third angle is the second angle.

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