Inverting system for liquid storage tanks in adjacent oxygen production stations

Abstract

The invention relates to a liquid storage tank inversion system in adjacent oxygen production stations, which comprises a first liquid storage tank, a second liquid storage tank, a first liquid inlet pipeline, a first vehicle filling pipeline, a second liquid inlet pipeline, a second vehicle filling pipeline, a first inversion pipeline, a second front inversion pipeline and a second rear inversion pipeline, the first end of the first tank reversing pipeline can be connected to the first position of the first vehicle filling pipeline in an on-off mode, and the second end of the first tank reversing pipeline can be connected with the second liquid storage tank in an on-off mode. The first end of the second front tank reversing pipeline is connected to the second position of the second vehicle filling pipeline in an on-off bypass mode, and the second end of the second front tank reversing pipeline is connected to the third position of the first tank reversing pipeline in a bypass mode. The first end of the second rear tank reversing pipeline is connected to the fourth position of the first tank reversing pipeline, and the second end of the second rear tank reversing pipeline can be connected with the first liquid storage tank in an on-off mode. According to the invention, flexible conveying and two-way storage of liquid in adjacent oxygen production stations during normal production are realized, free tank inversion between low-temperature liquid storage tanks is also realized, and harm to the environment and personnel during liquid leakage is reduced to the greatest extent.

Description

Technical Field

[0001] The invention relates to the field of oxygen production stations, and in particular to a liquid storage tank emptying system in adjacent oxygen production stations. Background Art

[0002] At present, oxygen production is an indispensable public auxiliary unit for both metallurgical enterprises and petrochemical enterprises. Cryogenic liquid storage tanks (liquid oxygen, liquid nitrogen, liquid argon) are an important part of the backup system of oxygen stations and are also process devices that are key to production safety monitoring. In recent years, there have been frequent incidents of leakage in cryogenic liquid storage tanks. If emergency measures are not taken, the defects will expand, which will not only endanger the personal safety of workers, but also cause considerable economic losses to enterprises.

[0003] The prior art discloses a liquid tank dumping device (a utility model patent with the authorization number CN206156739U), which is particularly aimed at acidic liquid storage devices and tank dumping devices used in power plants. The device uses the installation height difference to pour the liquid in the leaking liquid storage tank into other empty liquid storage tanks through a pipeline, and controls the flow or blocking of the liquid in the leaking liquid storage tank by opening and closing the liquid valve on the connecting pipeline. However, the scheme has the following disadvantages: first, the system can only realize the single direction of tank dumping from a high-position liquid tank to a low-position liquid tank. If a low-position liquid tank leaks, the tank dumping technology will fail and must be realized by means of a pump or pressure difference; second, for two tanks that are far apart and transported over long distances, the pipeline resistance loss is relatively large, which requires the two liquid tanks to have a large height difference, which invisibly increases the basic cost. Third, for multiple liquid tanks of equal volume arranged in the same area, there is a height difference in the arrangement, which will affect the visual beauty.

[0004] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a liquid storage tank dumping system in adjacent oxygen production stations to overcome the defects of the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a liquid storage tank emptying system in adjacent oxygen production stations, which not only realizes the flexible transportation and two-way storage of liquids in adjacent oxygen production stations during normal production, but also realizes the free emptying between low-temperature liquid storage tanks, thereby minimizing the harm to the environment and personnel caused by liquid leakage, and effectively increasing the safety and flexibility of production regulation.

[0006] The object of the present invention is achieved in this way. A liquid storage tank emptying system in adjacent oxygen production stations comprises a first liquid storage tank and a second liquid storage tank arranged adjacent to each other, and a first liquid inlet pipeline, a first vehicle filling pipeline, a second liquid inlet pipeline, a second vehicle filling pipeline, a first emptying pipeline, a second front emptying pipeline, and a second rear emptying pipeline; the first liquid inlet pipeline can be connected to the first liquid storage tank in an on-off manner, a first end of the first vehicle filling pipeline is connected to the first liquid storage tank, and a first liquid vehicle filling pump and a first vehicle filling valve are sequentially arranged on the first vehicle filling pipeline from the first end to the second end thereof; the second liquid inlet pipeline can be connected to the second liquid storage tank in an on-off manner, a first end of the second vehicle filling pipeline is connected to the second liquid storage tank, A second liquid car filling pump and a second car filling valve are sequentially arranged on the second car filling pipeline from its first end to its second end; the first end of the first tank-turning pipeline can be connected to the first position of the first car filling pipeline in an on-off manner, and its second end can be connected to the second liquid storage tank in an on-off manner, and the first position is located between the first liquid car filling pump and the first car filling valve; the first end of the second front tank-turning pipeline can be connected to the second position of the second car filling pipeline in an on-off manner, and its second end is connected to the third position of the first tank-turning pipeline, and the second position is located between the second liquid car filling pump and the second car filling valve; the first end of the second rear tank-turning pipeline is connected to the fourth position of the first tank-turning pipeline, and its second end can be connected to the first liquid storage tank in an on-off manner.

[0007] In a preferred embodiment of the present invention, a first liquid inlet valve is provided on the first liquid inlet pipeline, and a second liquid inlet valve is provided on the second liquid inlet pipeline; the fourth position and the third position are respectively close to the first end and the second end of the first tank pouring pipeline, a first front tank pouring valve is provided on the first tank pouring pipeline and located between the first end and the fourth position, and a first rear tank pouring valve is provided on the first tank pouring pipeline and located between the second end and the third position; a second front tank pouring valve is provided on the second front tank pouring pipeline, and a second rear tank pouring valve is provided on the second rear tank pouring pipeline.

[0008] In a preferred embodiment of the present invention, a first liquid level detection device is provided on the first liquid storage tank, and a second liquid level detection device is provided on the second liquid storage tank.

[0009] In a preferred embodiment of the present invention, the liquid storage tank emptying system in the adjacent oxygen production station also includes a controller, which is electrically connected to the first liquid inlet valve, the first liquid filling pump, the second liquid inlet valve, the second liquid filling pump, the first front emptying valve, the first rear emptying valve, the second front emptying valve, the second rear emptying valve, the first liquid level detection device and the second liquid level detection device; the controller can close the first liquid filling pump when the liquid level of the first liquid storage tank reaches a preset minimum liquid level, and close the second filling pump when the liquid level of the second liquid storage tank reaches a preset minimum liquid level; the controller can also close the first liquid inlet valve and open the first liquid filling pump when the liquid level of the first liquid storage tank reaches a preset maximum liquid level The controller can also close the second liquid inlet valve and open the second liquid filling pump, the second front tank dumping valve and the second rear tank dumping valve when the liquid level of the second liquid storage tank reaches the preset maximum liquid level, or close the second liquid inlet valve and open the second liquid filling pump, the second front tank dumping valve and the second rear tank dumping valve; the controller can also close the first liquid inlet valve and open the first liquid filling pump, the first front tank dumping valve and the first rear tank dumping valve when the first liquid storage tank leaks; the controller can also close the second liquid inlet valve and open the second liquid filling pump, the second front tank dumping valve and the second rear tank dumping valve when the second liquid storage tank leaks.

[0010] In a preferred embodiment of the present invention, a first alarm is also provided on the first liquid storage tank, and a second alarm is also provided on the second liquid storage tank. The controller is electrically connected to the first alarm and the second alarm, and can control the first alarm to alarm when the liquid level in the first liquid storage tank reaches a preset minimum liquid level or the liquid level in the first liquid storage tank reaches a preset maximum liquid level, and can also control the second alarm to alarm when the liquid level in the second liquid storage tank reaches a preset minimum liquid level or the liquid level in the second liquid storage tank reaches a preset maximum liquid level.

[0011] In a preferred embodiment of the present invention, the first front tank dump valve and the second front tank dump valve are both pressure regulating valves, and the first liquid inlet valve and the second liquid inlet valve are both quick-cut valves.

[0012] In a preferred embodiment of the present invention, a first front liquid discharge pipeline is connected to the first tank-turning pipeline and is located between the first front tank-turning valve and the fourth position so as to be switched on and off, a first rear liquid discharge pipeline is connected to the first tank-turning pipeline and is located between the first rear tank-turning valve and the second end thereof so as to be switched on and off, a second front liquid discharge pipeline is connected to the second front tank-turning pipeline and is located between the second front tank-turning valve and the second end thereof so as to be switched on and off, and a second rear liquid discharge pipeline is connected to the second rear tank-turning pipeline and is located between the second rear tank-turning valve and the second end thereof so as to be switched on and off.

[0013] In a preferred embodiment of the present invention, a first front drain liquid valve is provided on the first front drain liquid pipeline, a first rear drain liquid valve is provided on the first rear drain liquid pipeline, a second front drain liquid valve is provided on the second front drain liquid pipeline, and a second rear drain liquid valve is provided on the second rear drain liquid pipeline.

[0014] In a preferred embodiment of the present invention, a first front safety valve is connected on the first tank-turning pipeline and located between the first front tank-turning valve and the fourth position, a first rear safety valve is connected on the first tank-turning pipeline and located between the first rear tank-turning valve and its second end, a second front safety valve is connected on the second front tank-turning pipeline and located between the second front tank-turning valve and its second end, and a second rear safety valve is connected on the second rear tank-turning pipeline and located between the second rear tank-turning valve and its second end.

[0015] In a preferred embodiment of the present invention, a first pressure monitoring device is connected to the first tank-turning pipeline and is located between the first front tank-turning valve and the fourth position, and a second pressure monitoring device is connected to the second front tank-turning pipeline and is located between the second front tank-turning valve and its second end.

[0016] As mentioned above, since most enterprises have two or more oxygen production devices, and each oxygen production device is usually equipped with a liquid backup system, this application fully combines the integrity of the cryogenic oxygen production process and the actual production and operation of the liquid backup system, and sets a corresponding tank dumping pipeline between two adjacent liquid storage tanks, which not only ensures the flexible transportation and two-way storage of liquids in adjacent oxygen production stations during normal production, but also realizes the free tank dumping between low-temperature liquid storage tanks. When a liquid storage tank leaks, the liquid in the liquid storage tank can be quickly dumped and transferred to other liquid storage tanks, which greatly shortens the tank dumping time of the accident liquid storage tank. During the tank dumping process, the filling pump is used to pressurize the tank, which overcomes the static pressure problem caused by the terrain difference in the existing tank dumping technology. During the accident tank dumping process, there is no need to use a tank truck to pull away the liquid, which also ensures the safety of the staff. The whole system has a simple structure, convenient operation, strong operability, low cost, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0018] in:

[0019] Figure 1 : It is a structural schematic diagram of the liquid storage tank dumping system in adjacent oxygen production stations provided by the present invention.

[0020] Description of Figure Numbers:

[0021] 1. A first liquid storage tank;

[0022] 11. First liquid inlet pipeline; V04a, first liquid inlet valve; 12. First vehicle filling pipeline; 121, first liquid vehicle filling pump; V03a, first vehicle filling valve; 13. First liquid level detection device;

[0023] 2. Second liquid storage tank; 21. Second liquid inlet pipeline; V04b. Second liquid inlet valve; 22. Second vehicle filling pipeline; 221. Second liquid vehicle filling pump; V03b. Second vehicle filling valve; 23. Second liquid level detection device;

[0024] 3. First tank dumping pipeline; V01a, first front tank dumping valve; V02b, first rear tank dumping valve; 31, first front liquid discharge pipeline; 311, first front liquid discharge valve; 32, first rear liquid discharge pipeline; 321, first rear liquid discharge valve; 33, first front safety valve; 34, first rear safety valve; 35, first pressure monitoring device;

[0025] 4. Second front tank dumping pipeline; V01b, second front tank dumping valve; 41. Second front liquid discharge pipeline; 411, second front liquid discharge valve; 42. Second front safety valve; 43. Second pressure monitoring device;

[0026] 5. Second rear tank dumping pipeline; V02a, second rear tank dumping valve; 51. Second rear liquid discharge pipeline; 511, second rear liquid discharge valve; 52. Second rear safety valve. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0028] like Figure 1As shown, the present application provides a liquid storage tank tank-turning system in adjacent oxygen production stations, comprising a first liquid storage tank 1 and a second liquid storage tank 2 arranged adjacent to each other, and a first liquid inlet pipeline 11, a first vehicle filling pipeline 12, a second liquid inlet pipeline 21, a second vehicle filling pipeline 22, a first tank-turning pipeline 3, a second front tank-turning pipeline 4, and a second rear tank-turning pipeline 5; the first liquid inlet pipeline 11 can be connected to the first liquid storage tank 1 in an on-off manner, the first end of the first vehicle filling pipeline 12 is connected to the first liquid storage tank 1, and a first liquid vehicle filling pump 121 and a first vehicle filling valve V03a are sequentially provided on the first vehicle filling pipeline 12 from the first end to the second end thereof; the second liquid inlet pipeline 21 can be connected to the second liquid storage tank 2 in an on-off manner, the first end of the second vehicle filling pipeline 22 is connected to the second liquid storage tank 2, and The second car filling pipeline 22 is provided with a second liquid car filling pump 221 and a second car filling valve V03b in sequence from the first end to the second end; the first end of the first tank-turning pipeline 3 can be connected to the first position of the first car filling pipeline 12 in an on-off manner, and the second end can be connected to the second liquid storage tank 2 in an on-off manner, and the first position is located between the first liquid car filling pump 121 and the first car filling valve V03a; the first end of the second front tank-turning pipeline 4 can be connected to the second position of the second car filling pipeline 22 in an on-off manner, and the second end is connected to the third position of the first tank-turning pipeline 3, and the second position is located between the second liquid car filling pump 221 and the second car filling valve V03b; the first end of the second rear tank-turning pipeline 5 is connected to the fourth position of the first tank-turning pipeline 3, and the second end can be connected to the first liquid storage tank 1 in an on-off manner.

[0029] It can be understood that there will be a certain distance between the adjacent first liquid storage tank 1 and the second liquid storage tank 2 in the actual arrangement. The first liquid inlet pipeline 11 and the second liquid inlet pipeline 21 are used to receive cryogenic liquids such as liquid oxygen, liquid nitrogen, and hydraulic fluid from air separation, and the first vehicle filling pipeline 12 and the second vehicle filling pipeline 22 are used to transport the cryogenic liquid in the corresponding liquid storage tank to the corresponding tank truck.

[0030] When the oxygen generator is in normal production, both ends of the first tank dumping pipeline 3 are disconnected from the first car filling pipeline 12 and the second liquid storage tank 2, and the first end of the second front tank dumping pipeline 4 and the second end of the second rear tank dumping pipeline 5 are disconnected from the second car filling pipeline 22 and the first liquid storage tank 1. The first liquid inlet pipeline 11 and the second liquid inlet pipeline 21 are connected to the first liquid storage tank 1 and the second liquid storage tank 2 respectively, and the cryogenic liquid from the air separation enters the corresponding liquid storage tank through the corresponding liquid inlet pipeline to be stored in the corresponding liquid storage tank. When a tank truck arrives, the corresponding liquid filling pump and filling valve are opened to pull away the cryogenic liquid in the corresponding liquid storage tank; when the tank truck leaves, the corresponding liquid filling pump and filling valve are closed.

[0031] During the normal production process, if the liquid level in a certain liquid storage tank reaches the preset minimum liquid level, the liquid filling pump and filling valve corresponding to the liquid storage tank are closed. If the liquid in a certain liquid storage tank reaches the preset maximum liquid level, taking the case where the liquid level in the first liquid storage tank 1 reaches the preset maximum liquid level but the liquid in the second liquid storage tank 2 has not yet reached it, the first liquid inlet pipeline 11 should be disconnected from the first liquid storage tank 1. On the one hand, the liquid in the liquid storage tank can be pulled away through the filling tank; on the other hand, both ends of the first tank dumping pipeline 3 are connected to the first filling pipeline 12 and the second liquid storage tank 2, and the liquid in the first liquid storage tank 1 is transferred to the second liquid storage tank 2 through the first liquid filling pump 121 through the first tank dumping pipeline 3; after the liquid in the first liquid storage tank 1 drops to a certain value, the first liquid inlet pipeline 11 can be opened again.

[0032] Since the tank truck operates intermittently and cannot quickly remove the liquid in the first liquid storage tank 1, the first tank dumping pipeline 3 is used to transfer the liquid to the second liquid storage tank 2 during the interval when the tank truck is removing the liquid (that is, tank dumping is not performed when the tank truck is filling the liquid; tank dumping is performed during the period when the tank truck removes the liquid and leaves the site). This can speed up the transfer of the liquid in the first liquid storage tank 1 and the injection of the liquid in the second liquid storage tank 2. If the liquid level in the second liquid storage tank 2 reaches the preset maximum level but the liquid in the first liquid storage tank 1 has not reached it, the second front tank dumping pipeline 4 and the second rear tank dumping pipeline 5 are used to transfer the liquid to the first liquid storage tank 1 during the interval when the tank truck is removing the liquid.

[0033] If a liquid storage tank leaks during normal production, the corresponding liquid inlet pipeline and vehicle filling valve of the liquid storage tank are closed, and the liquid in the liquid storage tank is transferred to another liquid storage tank. This can not only quickly transfer the liquid, but also avoid the danger of operators using tank trucks. Taking the leakage of the first liquid storage tank 1 as an example, at this time, the first liquid inlet pipeline 11 is closed, the first vehicle filling valve V03a is closed, no more liquid is added, and the tank truck is no longer used to pull liquid; both ends of the first tank-removing pipeline 3 are connected to the first vehicle filling pipeline 12 and the second liquid storage tank 2, and the liquid in the first liquid storage tank 1 is transferred to the second liquid storage tank 2 through the first tank-removing pipeline 3 through the first liquid vehicle filling pump 121.

[0034] Therefore, since most enterprises have two or more oxygen production devices, and each oxygen production device is usually equipped with a liquid backup system, this application fully combines the integrity of the cryogenic oxygen production process and the actual production and operation of the liquid backup system, and sets a corresponding tank dumping pipeline between two adjacent liquid storage tanks, which not only ensures the flexible transportation and two-way storage of liquids in adjacent oxygen production stations during normal production, but also realizes the free tank dumping between low-temperature liquid storage tanks. When a liquid storage tank leaks, the liquid in the liquid storage tank can be quickly dumped and transferred to other liquid storage tanks, which greatly shortens the tank dumping time of the accident liquid storage tank. During the tank dumping process, the filling pump is used to pressurize the tank, which overcomes the static pressure problem caused by the terrain difference in the existing tank dumping technology. During the accident tank dumping process, there is no need to use a tank truck to pull away the liquid, which also ensures the safety of the staff. The whole system has a simple structure, convenient operation, strong operability, low cost, safety and reliability.

[0035] In a specific implementation, in order to facilitate the control of the on-off of each pipeline, a first liquid inlet valve V04a is provided on the first liquid inlet pipeline 11, and a second liquid inlet valve V04b is provided on the second liquid inlet pipeline 21; the fourth position and the third position are respectively close to the first end and the second end of the first tank pouring pipeline 3, and a first front tank pouring valve V01a is provided on the first tank pouring pipeline 3 and located between the first end and the fourth position, and a first rear tank pouring valve V02b is provided on the first tank pouring pipeline 3 and located between the second end and the third position; a second front tank pouring valve V01b is provided on the second front tank pouring pipeline 4, and a second rear tank pouring valve V02a is provided on the second rear tank pouring pipeline 5.

[0036] Among them, according to actual needs, the second end of the first tank pouring pipeline 3 can be directly connected to the second liquid storage tank 2, or it can be connected to the second liquid inlet pipeline 21 and located between the second liquid inlet valve V04b and the second liquid storage tank 2; the second end of the second rear tank pouring pipeline 5 can be directly connected to the first liquid storage tank 1, or it can be connected to the first liquid inlet pipeline 11 and located between the first liquid inlet valve V04a and the first liquid storage tank 1.

[0037] In order to detect the liquid level in each liquid storage tank, a first liquid level detection device 13 is provided on the first liquid storage tank 1, and a second liquid level detection device 23 is provided on the second liquid storage tank 2. The liquid level detection device here can be, for example, a liquid level sensor to detect the liquid level in real time.

[0038] Preferably, in order to improve the automatic control of the system, the liquid storage tank emptying system in the adjacent oxygen production station also includes a controller, and the controller is electrically connected to the first liquid inlet valve V04a, the first liquid filling pump 121, the second liquid inlet valve V04b, the second liquid filling pump 221, the first front emptying valve V01a, the first rear emptying valve V02b, the second front emptying valve V01b, the second rear emptying valve V02a, the first liquid level detection device 13 and the second liquid level detection device 23.

[0039] The controller can close the first liquid filling pump 121 when the liquid level of the first liquid storage tank 1 reaches the preset minimum liquid level, and close the second liquid filling pump 221 when the liquid level of the second liquid storage tank 2 reaches the preset minimum liquid level. The controller can also close the first liquid inlet valve V04a and open the first liquid filling pump 121 to fill the tank car when the liquid level of the first liquid storage tank 1 reaches the preset maximum liquid level; or close the first liquid inlet valve V04a and open the first liquid filling pump 121, the first front tank dumping valve V01a and the first rear tank dumping valve V02b to dump the tank. The controller can also close the second liquid inlet valve V04b and open the second liquid filling pump 221 to fill the tank car when the liquid level of the second liquid storage tank 2 reaches the preset maximum liquid level; or close the second liquid inlet valve V04b and open the second liquid filling pump 221, the second front tank dumping valve V01b and the second rear tank dumping valve V02a to dump the tank. The controller can also close the first liquid inlet valve V04a and open the first liquid filling pump 121, the first front tank dumping valve V01a and the first rear tank dumping valve V02b to dump the tank when a leak occurs in the first liquid storage tank 1. The controller can also close the second liquid inlet valve V04b and open the second liquid filling pump 221, the second front tank dumping valve V01b and the second rear tank dumping valve V02a to dump the tank when a leak occurs in the second liquid storage tank 2.

[0040] The first vehicle charging valve V03a and the second vehicle charging valve V03b are both manual valves. When the tank vehicle is not being charged, the corresponding vehicle charging valves should be closed.

[0041] Furthermore, a first alarm is provided on the first liquid storage tank 1, and a second alarm is provided on the second liquid storage tank 2. The controller is electrically connected to the first alarm and the second alarm, and can control the first alarm to alarm when the liquid level of the first liquid storage tank 1 reaches a preset minimum liquid level or the liquid level of the first liquid storage tank 1 reaches a preset maximum liquid level, and can also control the second alarm to alarm when the liquid level of the second liquid storage tank 2 reaches a preset minimum liquid level or the liquid level of the second liquid storage tank 2 reaches a preset maximum liquid level.

[0042] Furthermore, since the liquid pressure pumped by the liquid filling pump is greater than the pressure of the liquid stored in the liquid storage tank, in order for the liquid pressure delivered by the liquid filling pump to meet the liquid pressure requirement of the liquid storage tank when emptying the tank, the first front tank emptying valve V01a and the second front tank emptying valve V01b are both pressure regulating valves.

[0043] The pressure regulating valve here can specifically be a pressure reducing valve. Generally, the liquid pressure at the outlet of the filling pump is 0.8Mpa. After passing through the pressure regulating valve, the pressure can be reduced to 0.1-0.3MPa to reach the liquid inlet pressure of the liquid storage tank, which is the same as the air separation liquid inlet pressure.

[0044] The first liquid inlet valve V04a and the second liquid inlet valve V04b are preferably quick-cut valves, so that when a leakage accident occurs, the liquid inlet valves can be quickly closed and the response is faster.

[0045] Furthermore, in order to discharge the liquid remaining in the tank pouring pipeline in time after the corresponding tank pouring pipeline is completed and the corresponding tank pouring valve is closed, a first front liquid discharge pipeline 31 is connected and disconnected on the first tank pouring pipeline 3 and between the first front tank pouring valve V01a and the fourth position, a first rear liquid discharge pipeline 32 is connected and disconnected on the first tank pouring pipeline 3 and between the first rear tank pouring valve V02b and its second end, a second front liquid discharge pipeline 41 is connected and disconnected on the second front tank pouring pipeline 4 and between the second front tank pouring valve V01b and its second end, and a second rear liquid discharge pipeline 51 is connected and disconnected on the second rear tank pouring pipeline 5 and between the second rear tank pouring valve V02a and its second end.

[0046] The first front discharge line 31 can be used to discharge the liquid in the first tank dumping line 3 between the first front tank dumping valve V01a and the fourth position, and the first rear discharge line 32 can be used to discharge the liquid in the first tank dumping line 3 between the first rear tank dumping valve V02b and the second end of the first tank dumping line 3. The second front discharge line 41 can be used to discharge the liquid in the second front tank dumping line 4 between the second front tank dumping valve V01b and the third position, and the second rear discharge line 51 can be used to discharge the liquid in the second rear tank dumping line 5 between the second rear tank dumping valve V02a and the second end of the second rear tank dumping line 5.

[0047] In order to facilitate the on-off of each drainage pipeline, a first front drainage valve 311 is provided on the first front drainage pipeline 31, a first rear drainage valve 321 is provided on the first rear drainage pipeline 32, a second front drainage valve 411 is provided on the second front drainage pipeline 41, and a second rear drainage valve 511 is provided on the second rear drainage pipeline 51. The first front drainage valve 311, the first rear drainage valve 321, the second front drainage valve 411 and the second rear drainage pipeline 51 are generally manual valves.

[0048] Furthermore, in order to ensure the safe operation of the system, a first front safety valve 33 is connected on the first tank-turning pipeline 3 and is located between the first front tank-turning valve V01a and the fourth position, a first rear safety valve 34 is connected on the first tank-turning pipeline 3 and is located between the first rear tank-turning valve V02b and its second end, a second front safety valve 42 is connected on the second front tank-turning pipeline 4 and is located between the second front tank-turning valve V01b and its second end, and a second rear safety valve 52 is connected on the second rear tank-turning pipeline 5 and is located between the second rear tank-turning valve V02a and its second end.

[0049] On the one hand, since both the first front tank dump valve V01a and the second front tank dump valve V01b use a pressure regulating valve, if the pressure regulating valve fails, there will be a pressure overpressure situation; on the other hand, if there is residual cryogenic liquid in the tank dump pipeline, it is likely to vaporize and cause the pressure in the pipeline to overpressure. Through the setting of each safety valve, when the pressure in the corresponding pipeline is overpressure, it can be automatically opened to protect the pipeline from overpressure.

[0050] Furthermore, a first pressure monitoring device 35 is connected to the first tank dumping pipeline 3 and located between the first front tank dumping valve V01a and the fourth position, and a second pressure monitoring device 43 is connected to the second front tank dumping pipeline 4 and located between the second front tank dumping valve V01b and the second end thereof. The pressure monitoring device here can be, for example, a pressure gauge, so that the staff can timely understand the pressure situation in the pipeline. When the pressure exceeds a certain value, the staff can inspect the pressure regulating valve to determine whether there is a failure, etc.

[0051] More specifically, the first front tank dumping valve V01a and the first rear tank dumping valve V02b are opened and closed together, and the second front tank dumping valve V01b and the second rear tank dumping valve V02a are opened and closed together. The entire tank dumping system mainly has the following three working states, and the specific working principles are as follows:

[0052] The first working state: the oxygen generator is in normal production

[0053] At this time, the liquid backup system is in an unactivated state, and each liquid storage tank is in a liquid filling state, continuously containing liquid, and the liquid in each liquid storage tank can be transported away by a tank truck. Correspondingly, the first front tank dump valve V01a, the first rear tank dump valve V02b, the second front tank dump valve V01b and the second rear tank dump valve V02a are all closed, the first liquid inlet valve V04a and the second liquid inlet valve V04b are both opened, and the low-temperature liquid from the air separation is respectively filled into the corresponding liquid storage tank through the corresponding liquid inlet valve. When the tank truck corresponding to the first liquid storage tank 1 (or the second liquid storage tank 2) arrives, the first filling pump and the first filling valve V03a (or the second filling pump and the second filling valve V03b) are opened to pull away the low-temperature liquid in the first liquid storage tank 1 (or the second liquid storage tank 2). The filling of the tank truck is mainly achieved by the liquid filling pump, that is, after the low-temperature liquid comes out of the corresponding liquid storage tank, it is pressurized by the corresponding liquid filling pump and enters the corresponding tank truck; the liquid filling pump is opened intermittently according to demand.

[0054] The second working state: During normal production, a low liquid level alarm or a high liquid level alarm occurs in a liquid storage tank.

[0055] When the first liquid level detection device 13 detects that the liquid level in the first liquid storage tank 1 reaches the preset minimum liquid level, the controller controls the first alarm to sound an alarm (low liquid level alarm), and turns off the first liquid filling pump 121, and manually closes the first filling valve V03a to stop the tank car. When the second liquid level detection device 23 detects that the liquid level in the second liquid storage tank 2 reaches the preset minimum liquid level, the controller controls the second alarm to sound an alarm (low liquid level alarm), and turns off the second liquid filling pump 221, and manually closes the second filling valve V03b to stop the tank car.

[0056] When the liquid in the liquid storage tank reaches the preset maximum liquid level, a high-level alarm will be sounded, and the corresponding liquid inlet valve will be closed at this time. The user should use a tank truck to pull away the liquid in time. However, since the tank truck is not pulling liquid continuously, there is no tank truck on site during this period before the tank truck pulls away the liquid and arrives again, and the work efficiency is low. In this embodiment, in order to improve the work efficiency in this case, when one of the first liquid storage tank 1 and the second liquid storage tank 2 is about to be full and the high-level alarm is sounded, and the tank truck fails to arrive in time, the user can transfer the liquid to the liquid storage tank with surplus volume by inverting the tank.

[0057] For example, when the first liquid storage tank 1 is about to be filled and a high liquid level alarm sounds, that is, when the first liquid level detection device 13 detects that the liquid in the first liquid storage tank 1 reaches the preset maximum liquid level, the controller controls the first alarm to sound an alarm (high liquid level alarm), and the controller closes the first liquid inlet valve V04a at this time; after the user confirms the selection of tank dumping, the controller controls the opening of the first liquid filling pump 121, the first front tank dumping valve V01a and the first rear tank dumping valve V02b, and transfers the liquid in the first liquid storage tank 1 to the second liquid storage tank 2 through the first liquid filling pump 121; when the second liquid storage tank 2 has a high liquid level alarm, the controller closes the second liquid inlet valve V04b and the first liquid filling pump 121. In this process, after the liquid in the first liquid storage tank 1 drops to a certain value, the staff can remotely open the first liquid inlet valve V04a to continue to fill the liquid.

[0058] Similarly, when the second liquid storage tank 2 is about to be filled and the high liquid level alarm sounds, that is, when the second liquid level detection device 23 detects that the liquid in the second liquid storage tank 2 has reached the preset maximum liquid level, the controller controls the second alarm to sound an alarm (high liquid level alarm), and the controller closes the second liquid inlet valve V04b at this time; after the user confirms the selection of tank dumping, the controller controls the opening of the second liquid filling pump 221, the second front tank dumping valve V01b and the second rear tank dumping valve V02a, and transfers the liquid in the second liquid storage tank 2 to the first liquid storage tank 1 through the second liquid filling pump 221; when the high liquid level alarm sounds in the first liquid storage tank 1, the controller closes the first liquid inlet valve V04a and the second liquid filling pump 221. In this process, after the liquid in the second liquid storage tank 2 drops to a certain value, the staff can remotely open the second liquid inlet valve V04b to continue filling the liquid.

[0059] The third working state: During normal production, a liquid storage tank leaks

[0060] When a liquid storage tank leaks, the liquid inlet valve of the liquid storage tank should be closed urgently and the liquid in the liquid storage tank should be transferred to other liquid storage tanks in time.

[0061] For example, when the first liquid storage tank 1 leaks, after the user receives a leakage alarm, the controller remotely controls to close the first liquid inlet valve V04a, opens the first liquid filling pump 121, the first front tank emptying valve V01a and the first rear tank emptying valve V02b; and transfers the liquid in the first liquid storage tank 1 to the second liquid storage tank 2 through the first liquid filling pump 121.

[0062] Similarly, when the second liquid storage tank 2 leaks, after the user receives the leakage alarm, the controller remotely controls to close the second liquid inlet valve V04b, opens the second liquid filling pump 221, the second front tank emptying valve V01b and the second rear tank emptying valve V02a; and transfers the liquid in the second liquid storage tank 2 to the first liquid storage tank 1 through the second liquid filling pump 221.

[0063] In summary, the can-inverting system in this embodiment has the following advantages:

[0064] (1) This system is a supplement and improvement to the conventional oxygen production process. It fully combines the actual production and operation conditions, and rationally designs the liquid tank dumping process flow. There are several operation modes corresponding to different oxygen production conditions, which can be achieved by controlling the opening and closing of valves and liquid filling pumps, ensuring the flexible transportation and two-way storage of liquids in adjacent oxygen production stations during normal production, and realizing the free tank dumping between low-temperature liquid storage tanks, thereby maintaining the safe operation of the liquid storage tanks and facilitating the operation and management of on-site personnel. According to the normal production and accident status of the oxygen production unit, the normal startup of the liquid backup system is guaranteed, the operation safety of the liquid storage tank is always guaranteed, while also ensuring the safety of personnel and production, and realizing flexible production.

[0065] (2) The system shortens the time for emptying the tank when a leak occurs in the liquid storage tank. It is easy and quick to operate, creating more favorable protection conditions for the user's safe production.

[0066] (3) The liquid storage tank unloading system is used in adjacent oxygen production stations in the same factory. It can efficiently utilize the process characteristics of the liquid backup system. It can not only flexibly switch the operation mode, but also solve the complexity of unloading tanks by conventional tank trucks. The system has a simple process, strong operability, low operating cost, safety and reliability, and provides users with a flexible production method.

[0067] (4) The system's liquid storage tanks include liquid oxygen, liquid nitrogen, and liquid argon storage tanks used in the oxygen production process. The system uses a vehicle charging pump to pressurize the system, thereby enabling tank transfer between different liquid storage tanks and overcoming the static pressure problem caused by terrain differences.

[0068] (5) The system is equipped with a pressure regulating valve, which can effectively solve the problem of the difference between the filling pump pressure and the allowable pressure of the storage tank filling, and more effectively ensure the safe operation of the liquid storage tank.

[0069] (6) The system is equipped with an automatic control system. When a low liquid level alarm is triggered in a certain liquid storage tank, its liquid filling pump is interlocked and the filling truck is stopped; when a high liquid level alarm is triggered in a certain liquid storage tank, the liquid inlet valve of the liquid level storage tank is interlocked and closed, and the user can manually start the pump to empty the tank or fill the truck; when the liquid is being poured into the tank and the high liquid level alarm is triggered, the liquid inlet valve of the liquid storage tank is interlocked and closed, and the filling pump of the empty liquid storage tank is interlocked and stopped, and the emptying is completed. The high and low liquid level alarms, and the interlocked stopping of the filling pump or the closing of the liquid inlet valve ensure the safe operation of the system.

[0070] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A liquid storage tank dumping system in adjacent oxygen production stations, characterized in that: It includes a first liquid storage tank and a second liquid storage tank arranged adjacent to each other, and a first liquid inlet pipeline, a first vehicle filling pipeline, a second liquid inlet pipeline, a second vehicle filling pipeline, a first tank pouring pipeline, a second front tank pouring pipeline, and a second rear tank pouring pipeline; The first liquid inlet pipeline is connected to the first liquid storage tank in an on-off manner, the first end of the first vehicle filling pipeline is connected to the first liquid storage tank, and a first liquid vehicle filling pump and a first vehicle filling valve are sequentially provided on the first vehicle filling pipeline from the first end to the second end; the second liquid inlet pipeline is connected to the second liquid storage tank in an on-off manner, the first end of the second vehicle filling pipeline is connected to the second liquid storage tank, and a second liquid vehicle filling pump and a second vehicle filling valve are sequentially provided on the second vehicle filling pipeline from the first end to the second end; The first end of the first tank-inverting pipeline can be connected and disconnected to the first position of the first car-filling pipeline, and the second end thereof can be connected and disconnected to the second liquid storage tank, and the first position is located between the first liquid car-filling pump and the first car-filling valve; the first end of the second front tank-inverting pipeline can be connected and disconnected to the second position of the second car-filling pipeline, and the second end thereof is connected and disconnected to the third position of the first tank-inverting pipeline, and the second position is located between the second liquid car-filling pump and the second car-filling valve; the first end of the second rear tank-inverting pipeline is connected and disconnected to the fourth position of the first tank-inverting pipeline, and the second end thereof can be connected and disconnected to the first liquid storage tank.

2. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 1, characterized in that: A first liquid inlet valve is provided on the first liquid inlet pipeline, and a second liquid inlet valve is provided on the second liquid inlet pipeline; the fourth position and the third position are respectively close to the first end and the second end of the first tank pouring pipeline, a first front tank pouring valve is provided on the first tank pouring pipeline and between its first end and the fourth position, and a first rear tank pouring valve is provided on the first tank pouring pipeline and between its second end and the third position; a second front tank pouring valve is provided on the second front tank pouring pipeline, and a second rear tank pouring valve is provided on the second rear tank pouring pipeline.

3. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 2, characterized in that: A first liquid level detection device is provided on the first liquid storage tank, and a second liquid level detection device is provided on the second liquid storage tank.

4. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 3, characterized in that: The liquid storage tank emptying system in the adjacent oxygen production station further includes a controller, and the controller is electrically connected to the first liquid inlet valve, the first liquid filling pump, the second liquid inlet valve, the second liquid filling pump, the first front emptying valve, the first rear emptying valve, the second front emptying valve, the second rear emptying valve, the first liquid level detection device, and the second liquid level detection device; The controller can close the first liquid filling pump when the liquid level of the first liquid storage tank reaches a preset minimum liquid level, and close the second liquid filling pump when the liquid level of the second liquid storage tank reaches a preset minimum liquid level; the controller can also close the first liquid inlet valve and open the first liquid filling pump when the liquid level of the first liquid storage tank reaches a preset maximum liquid level, or close the first liquid inlet valve and open the first liquid filling pump, the first front tank dumping valve and the first rear tank dumping valve; the controller can also close the second liquid inlet valve and open the second liquid filling pump when the liquid level of the second liquid storage tank reaches a preset maximum liquid level, or close the second liquid inlet valve and open the second liquid filling pump, the second front tank dumping valve and the second rear tank dumping valve; the controller can also close the first liquid inlet valve and open the first liquid filling pump, the first front tank dumping valve and the first rear tank dumping valve when the first liquid storage tank leaks; the controller can also close the second liquid inlet valve and open the second liquid filling pump, the second front tank dumping valve and the second rear tank dumping valve when the second liquid storage tank leaks.

5. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 4, characterized in that: A first alarm is also provided on the first liquid storage tank, and a second alarm is also provided on the second liquid storage tank. The controller is electrically connected to the first alarm and the second alarm, and can control the first alarm to alarm when the liquid level of the first liquid storage tank reaches a preset minimum liquid level or the liquid level of the first liquid storage tank reaches a preset maximum liquid level, and can also control the second alarm to alarm when the liquid level of the second liquid storage tank reaches a preset minimum liquid level or the liquid level of the second liquid storage tank reaches a preset maximum liquid level.

6. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 2, characterized in that: The first front tank dump valve and the second front tank dump valve are both pressure regulating valves, and the first liquid inlet valve and the second liquid inlet valve are both quick-cut valves.

7. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 6, characterized in that: A first front liquid discharge pipeline is connected to the first tank-turning pipeline and is located between the first front tank-turning valve and the fourth position so as to be switchable. A first rear liquid discharge pipeline is connected to the first tank-turning pipeline and is located between the first rear tank-turning valve and its second end so as to be switchable. A second front liquid discharge pipeline is connected to the second front tank-turning pipeline and is located between the second front tank-turning valve and its second end so as to be switchable. A second rear liquid discharge pipeline is connected to the second rear tank-turning pipeline and is located between the second rear tank-turning valve and its second end so as to be switchable.

8. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 7, characterized in that: A first front liquid discharge valve is provided on the first front liquid discharge pipeline, a first rear liquid discharge valve is provided on the first rear liquid discharge pipeline, a second front liquid discharge valve is provided on the second front liquid discharge pipeline, and a second rear liquid discharge valve is provided on the second rear liquid discharge pipeline.

9. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 6, characterized in that: A first front safety valve is connected to the first tank-turning pipeline and located between the first front tank-turning valve and the fourth position, a first rear safety valve is connected to the first tank-turning pipeline and located between the first rear tank-turning valve and its second end, a second front safety valve is connected to the second front tank-turning pipeline and located between the second front tank-turning valve and its second end, and a second rear safety valve is connected to the second rear tank-turning pipeline and located between the second rear tank-turning valve and its second end.

10. The liquid storage tank emptying system in adjacent oxygen production stations as claimed in claim 6, characterized in that: A first pressure monitoring device is also connected to the first tank-turning pipeline and located between the first front tank-turning valve and the fourth position, and a second pressure monitoring device is also connected to the second front tank-turning pipeline and located between the second front tank-turning valve and its second end.

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