Air separation reserve drainage system

Abstract

The utility model relates to the technical field of air separation backup systems, in particular to an air separation backup liquid drainage system. The air separation backup liquid drainage system comprises an air separation backup system body, a liquid filling pump, a liquid drainage pipe, an evaporation device and a delivery pipe. The delivery pipe is communicated with the air separation backup system, the liquid filling pump is arranged on the delivery pipe, and the liquid discharge pipe is connected with the delivery pipe; the evaporation device comprises an evaporation inner box, a gravel layer arranged at the bottom of the evaporation inner box and a gas discharge pipe arranged at the top of the evaporation inner box, and the liquid discharge pipe is communicated with the gravel layer; liquid nitrogen / liquid oxygen pre-cooled by the liquid filling pump is discharged into the evaporation device through the liquid discharging pipe, the discharging height of nitrogen / oxygen can be increased through the gas discharging pipe, and potential safety hazards caused by nitrogen concentration to operators are avoided; the liquid nitrogen / liquid oxygen is discharged to the gravel layer so that the ground can be prevented from being damaged, meanwhile, the contact area between the liquid nitrogen / liquid oxygen and the gravel layer can be increased, the gas discharging efficiency is improved, and the discharging requirement is met while precooling of the liquid filling pump is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation backup systems, in particular to an air separation backup liquid discharge system. Background Art

[0002] The air separation backup system usually stores liquid nitrogen and liquid oxygen. When a failure of the air separation unit causes insufficient gas supply to subsequent units, temporary tail gas is used to provide nitrogen and oxygen, thereby ensuring the stable operation of subsequent systems and avoiding losses caused by shutdown of subsequent systems.

[0003] The air separation backup system, such as the Chinese utility model patent with application number 202320591802.9, provides an uninterrupted oxygen supply device for the air separation backup system, which enables the subsequent gas-using devices to continue production without stopping during the short shutdown of the air separation. When the air separation system is shut down, the liquid oxygen stored in the liquid oxygen storage tank is pressurized and gasified by the backup pump and sent to the subsequent gas-using device to ensure the continuous production of the system during the short shutdown.

[0004] The air separation backup system can also sell the stored liquid nitrogen and liquid oxygen to generate economic benefits; however, in the actual sales process, the delivery pump needs to be pre-cooled. At this time, the delivery pump will be opened to discharge the liquid nitrogen or liquid oxygen. The discharged liquid nitrogen and liquid oxygen will damage the ground due to the low temperature. At the same time, the random discharge of vaporized nitrogen can easily suffocate nearby operators, causing safety hazards and failing to meet actual emission requirements. Utility Model Content

[0005] The utility model aims to provide an air separation backup liquid discharge system to solve the technical problem that the discharge of liquid nitrogen and liquid oxygen in the current air separation backup system cannot meet the requirements.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An air separation backup liquid discharge system, comprising an air separation backup system, a liquid filling pump, a liquid discharge pipe, an evaporation device and an external delivery pipe;

[0008] The external delivery pipe is connected to the air separation backup system, the liquid filling pump is arranged on the external delivery pipe, and one end of the liquid discharge pipe is connected to the external delivery pipe;

[0009] The evaporation device comprises an evaporation inner box, a gravel layer arranged at the bottom of the evaporation inner box and a gas discharge pipe arranged at the top of the evaporation inner box, and the other end of the liquid discharge pipe is communicated with the gravel layer.

[0010] It is further defined that the air separation backup liquid drainage system also includes a gas input pipe, and the gas input pipe is connected to the gravel layer.

[0011] It is further defined that the liquid discharge pipe includes an evaporation section and a liquid supply section, the evaporation section is connected to the external delivery pipe through the liquid supply section, one end of the evaporation section extends through the evaporation inner box to the inside of the gravel layer, and the gas input pipe is connected to the gravel layer through the evaporation section.

[0012] It is further defined that a plurality of discharge holes are provided on the evaporation section, the plurality of discharge holes are arranged in an array along the axial direction of the evaporation section, and the discharge holes are located inside the gravel layer.

[0013] It is further defined that the thickness of the gravel layer is 1000 mm to 1500 mm.

[0014] It is further defined that a gas source switch valve is provided on the gas input pipe, and the gas source switch valve is located outside the evaporation inner box.

[0015] It is further defined that the liquid supply section includes a liquid nitrogen discharge branch pipe and a liquid oxygen discharge branch pipe, the liquid filling pump includes a liquid nitrogen filling pump and a liquid oxygen filling pump, the external delivery pipe includes a liquid nitrogen external sales pipe and a liquid oxygen external sales pipe, and the liquid nitrogen external sales pipe and the liquid oxygen external sales pipe are both connected to the air separation backup system;

[0016] The liquid nitrogen filling pump is arranged on the liquid nitrogen external sales pipe, and the liquid nitrogen discharge branch pipe is connected to the liquid nitrogen external sales pipe; the liquid oxygen filling pump is arranged on the liquid oxygen external sales pipe, and the liquid oxygen discharge branch pipe is connected to the liquid oxygen external sales pipe;

[0017] The liquid nitrogen discharge branch pipe and the liquid oxygen discharge branch pipe are both connected to one end of the evaporation section.

[0018] It is further defined that a liquid nitrogen drainage unit is provided on the liquid nitrogen discharge branch pipe, the liquid nitrogen discharge branch pipe is connected to the liquid nitrogen external sales pipe through the liquid nitrogen drainage unit, and the liquid nitrogen drainage unit is connected to opposite sides of the liquid nitrogen filling pump;

[0019] The liquid oxygen discharge branch pipe is provided with a liquid oxygen spray guide unit, and the liquid oxygen discharge branch pipe is connected with the liquid oxygen external sales pipe through the liquid oxygen spray guide unit, and the liquid oxygen spray guide unit is connected to the opposite sides of the liquid oxygen filling pump.

[0020] It is further defined that the liquid nitrogen external sales pipe is provided with a stop valve before liquid nitrogen external sales and a stop valve after liquid nitrogen external sales, the stop valve before liquid nitrogen external sales is located between the air separation backup system and the liquid nitrogen external sales unit, and the stop valve after liquid nitrogen external sales is located at the end of the liquid nitrogen external sales pipe; the liquid oxygen external sales pipe is provided with a stop valve before liquid oxygen external sales and a stop valve after liquid oxygen external sales, the stop valve before liquid oxygen external sales is located between the air separation backup system and the liquid oxygen external sales unit, and the stop valve after liquid oxygen external sales is located at the end of the liquid oxygen external sales pipe.

[0021] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0022] 1. The utility model utilizes a liquid discharge pipe to discharge the liquid nitrogen / liquid oxygen used for precooling the liquid filling pump into the evaporation device. On the one hand, the discharge height of nitrogen / oxygen can be increased through the gas discharge pipe to avoid the potential safety hazard to operators caused by the concentration of nitrogen; on the other hand, discharging the liquid nitrogen / liquid oxygen into the gravel layer can avoid damaging the ground, and at the same time can also increase the contact area between the liquid nitrogen / liquid oxygen and the gravel layer, improve the gas discharge efficiency, and realize the precooling of the liquid filling pump while meeting the discharge requirements.

[0023] 2. The utility model connects the gas input pipe with the evaporation section to further improve the evaporation efficiency of liquid nitrogen / liquid oxygen; by opening a plurality of discharge holes on the evaporation section, the distribution of liquid nitrogen and liquid oxygen in the gravel layer is more uniform, thereby improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the air separation backup liquid discharge system of the utility model;

[0025] In the figure: 10-air separation backup system; 20-liquid filling pump; 21-liquid nitrogen filling pump; 22-liquid oxygen filling pump; 30-liquid discharge pipe; 31-evaporation section; 32-liquid supply section; 33-liquid nitrogen discharge branch pipe; 34-liquid oxygen discharge branch pipe; 35-liquid nitrogen shower unit; 36-liquid oxygen shower unit; 40-evaporation device; 41-evaporation inner box; 42-gravel layer; 43-gas discharge pipe; 50-gas input pipe; 51-gas source switch valve; 60-external delivery pipe; 61-liquid nitrogen external sale pipe; 62-liquid oxygen external sale pipe; 63-liquid nitrogen external sale pre-stop valve; 64-liquid oxygen external sale pre-stop valve; 65-liquid nitrogen external sale post-stop valve; 66-liquid oxygen external sale post-stop valve. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is further described in detail in combination with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model. Specific details such as specific system structures and technologies are proposed in order to more thoroughly understand the embodiments of the utility model. The described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. However, it should be clear to those skilled in the art that the utility model can also be implemented in other embodiments without these specific details. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection disclosed by the present utility model.

[0027] Example 1

[0028] refer to Figure 1The present embodiment provides an air separation backup liquid discharge system, including an air separation backup system 10, a liquid filling pump 20, a liquid discharge pipe 30, an evaporation device 40 and an external delivery pipe 60, the external delivery pipe 60 is connected to the air separation backup system 10, the liquid filling pump 20 is arranged on the external delivery pipe 60, one end of the liquid discharge pipe 30 is connected to the external delivery pipe 60, and the other end of the liquid discharge pipe 30 is connected to the evaporation device 40.

[0029] Among them, the air separation backup system 10 needs to pre-cool the liquid filling pump 20 before loading the stored liquid nitrogen and liquid oxygen for sale through the external delivery pipe 60. At this time, the liquid discharge pipe 30 can be selected to be connected between the air separation backup system 10 and the liquid filling pump 20. When the liquid nitrogen and liquid oxygen are sold through the external delivery pipe 60, the liquid nitrogen and liquid oxygen can also be discharged to the evaporation device 40 through the liquid discharge pipe 30. The evaporation device 40 collects the liquid nitrogen and liquid oxygen in a unified manner, and discharges the evaporated gas in a unified manner, so as to avoid the liquid nitrogen and liquid oxygen being discharged everywhere to cause damage to the ground and cause suffocation hazards to the operators.

[0030] Specifically, the evaporation device 40 includes an evaporation inner box 41 , a gravel layer 42 and a gas exhaust pipe 43 .

[0031] The evaporation inner box 41 can be formed by digging a pit on the ground, for example, forming a 1500mm×1500mm×1500mm deep pit, using concrete pouring to form a 200mm thick retaining wall, and planting reinforcement in the retaining wall.

[0032] The gravel layer 42 is paved with pebbles with a particle size of 30mm to 50mm. The paving thickness of the gravel layer 42 can be selected to be 1000mm to 1500mm, preferably 1200mm, to avoid damage to the ground due to random discharge. At the same time, the liquid nitrogen / liquid oxygen contacts the gaps between the pebbles to increase the contact area and improve the evaporation efficiency.

[0033] The gas discharge pipe 43 is opened at the top of the evaporation inner box 41, and the gas discharge pipe 43 is at least 4 meters away from the ground to avoid excessive local concentration of evaporated nitrogen / oxygen, so that the air separation backup system drainage meets the requirements.

[0034] To further illustrate, the liquid discharge pipe 30 includes an evaporation section 31 and a liquid supply section 32, wherein the liquid supply section 32 includes a liquid nitrogen discharge branch pipe 33 and a liquid oxygen discharge branch pipe 34, one end of the liquid nitrogen discharge branch pipe 33 and one end of the liquid oxygen discharge branch pipe 34 are both connected to the external delivery pipe 60, the other end of the liquid nitrogen discharge branch pipe 33 and the other end of the liquid oxygen discharge branch pipe 34 are both connected to the evaporation section 31, and the other end of the evaporation section 31 extends through the evaporation inner box 41 to the gravel layer 42, so that the liquid nitrogen can be mixed with the liquid oxygen and then discharged into the gravel layer 42 for evaporation.

[0035] Among them, the other end of the evaporation section 31 can be selected to extend to the middle position of the gravel layer 42, so that the liquid nitrogen / liquid oxygen can be evenly diffused in the entire gravel layer 42; or the other end of the evaporation section 31 can be selected to be blocked, and then a plurality of discharge holes are opened on the evaporation section 31 located in the gravel layer 42, and the plurality of discharge holes are arranged in a row along the axis of the evaporation section 31, so that the liquid nitrogen / liquid oxygen can be evenly distributed in the gravel layer 42 through the discharge holes, thereby improving the evaporation efficiency of the liquid nitrogen / liquid oxygen.

[0036] Preferably, a gas input pipe 50 is provided below the evaporation section 31 , and the gas input pipe 50 extends from the outside of the evaporation inner box 41 to the gravel layer 42 , and is used to provide compressed air or steam to improve the evaporation efficiency of liquid nitrogen / liquid oxygen. At this time, a gas source switch valve 51 is provided on the gas input pipe 50 to facilitate the control of the gas supply, and the gas source switch valve 51 is provided on the outside of the evaporation inner box 41 .

[0037] Correspondingly, the external delivery pipe 60 includes a liquid nitrogen external sales pipe 61 and a liquid oxygen external sales pipe 62, and the liquid filling pump 20 includes a liquid nitrogen filling pump 21 and a liquid oxygen filling pump 22; the liquid nitrogen filling pump 21 is installed on the liquid nitrogen external sales pipe 61, and the liquid nitrogen discharge branch pipe 33 is connected to the liquid nitrogen external sales pipe 61; the liquid oxygen filling pump 22 is installed on the liquid oxygen external sales pipe 62, and the liquid oxygen discharge branch pipe 34 is connected to the liquid oxygen external sales pipe 62.

[0038] Liquid nitrogen is discharged through the liquid nitrogen sales pipe 61 for precooling the liquid nitrogen filling pump 21, and liquid oxygen is discharged through the liquid oxygen sales pipe 62 for precooling the liquid oxygen filling pump 22. Therefore, during the operation, a portion of the liquid nitrogen and liquid oxygen are discharged to the gravel layer 42 in the evaporation inner box 41 through the corresponding liquid nitrogen discharge branch pipe 33 and liquid oxygen discharge branch pipe 34 during the sales process, thereby meeting the discharge requirements.

[0039] After completing the pre-cooling of the liquid nitrogen filling pump 21 and / or the liquid oxygen filling pump 22, the liquid nitrogen filling pump 21 and / or the liquid oxygen filling pump 22 are turned on, and the liquid nitrogen and / or liquid oxygen are loaded onto the vehicle through the liquid nitrogen external sales pipe 61 and / or the liquid oxygen external sales pipe 62.

[0040] At this time, in order to facilitate the control of the liquid nitrogen / liquid oxygen discharge object, a liquid nitrogen drain unit 35 is selected to be set on the liquid nitrogen discharge branch pipe 33, and a liquid nitrogen pre-sale stop valve 63 and a liquid nitrogen post-sale stop valve 65 are set on the liquid nitrogen sale pipe 61; the liquid nitrogen discharge branch pipe 33 is connected to both sides of the inlet / outlet of the liquid nitrogen filling pump 21 through the liquid nitrogen drain unit 35; the liquid nitrogen pre-sale stop valve 63 is set between the liquid nitrogen drain unit 35 and the air separation backup system 10, that is, located at the head end of the liquid nitrogen sale pipe 61, and the liquid nitrogen post-sale stop valve 65 is set at the end of the liquid nitrogen sale pipe 61.

[0041] Among them, the liquid nitrogen spray unit 35 includes two liquid nitrogen spray pipes and a liquid nitrogen spray valve arranged on the liquid nitrogen spray pipes. The two liquid nitrogen spray pipes are connected to both sides of the inlet / outlet of the liquid nitrogen filling pump 21. The liquid nitrogen discharge branch pipe 33 is connected to the liquid nitrogen sales pipe 61 through the two liquid nitrogen spray pipes.

[0042] During operation, the liquid nitrogen filling pump 21 needs to be pre-cooled first. At this time, the liquid nitrogen filling pump 21 is closed, and the liquid nitrogen pre-sale stop valve 63, the liquid nitrogen post-sale stop valve 65 and the two liquid nitrogen drain valves are opened, so that the liquid nitrogen can be pre-cooled for the liquid nitrogen filling pump 21 during the process of loading through the liquid nitrogen sale pipe 61, and the liquid nitrogen is discharged to the gravel layer 42 through the liquid nitrogen drain unit 35; when the pre-cooling of the liquid nitrogen filling pump 21 is completed, the two liquid nitrogen drain valves are closed, and the loading is carried out directly; after the loading is completed, the liquid nitrogen pre-sale stop valve 63 and the liquid nitrogen post-sale stop valve 65 are closed, and the two liquid nitrogen drain valves are opened to discharge the liquid nitrogen in the liquid nitrogen sale pipe 61 through the liquid nitrogen drain unit 35.

[0043] Similarly, a liquid oxygen drainage unit 36 ​​is provided on the liquid oxygen discharge branch pipe 34, and a liquid oxygen pre-sale stop valve 64 and a liquid oxygen post-sale stop valve 66 are provided on the liquid oxygen sale pipe 62; the liquid oxygen discharge branch pipe 34 is connected to both sides of the inlet / outlet of the liquid oxygen filling pump 22 through the liquid oxygen drainage unit 36; the liquid oxygen pre-sale stop valve 64 is provided between the liquid oxygen drainage unit 36 ​​and the air separation backup system 10, that is, located at the head end of the liquid oxygen sale pipe 62, and the liquid oxygen post-sale stop valve 66 is provided at the end of the liquid oxygen sale pipe 62.

[0044] Among them, the liquid oxygen spray unit 36 ​​includes two liquid oxygen spray pipes and a liquid oxygen spray valve arranged on the liquid oxygen spray pipes. The two liquid oxygen spray pipes are connected to the inlet / outlet sides of the liquid oxygen filling pump 22. The liquid oxygen discharge branch pipe 34 is connected to the liquid oxygen sales pipe 62 through the two liquid oxygen spray pipes.

[0045] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air separation backup liquid drainage system, characterized in that: It comprises an air separation backup system (10), a liquid filling pump (20), a liquid discharge pipe (30), an evaporation device (40) and an external delivery pipe (60); The external delivery pipe (60) is in communication with the air separation backup system (10), the liquid filling pump (20) is arranged on the external delivery pipe (60), and one end of the liquid discharge pipe (30) is connected to the external delivery pipe (60); The evaporation device (40) comprises an evaporation inner box (41), a gravel layer (42) arranged at the bottom of the evaporation inner box (41), and a gas discharge pipe (43) arranged at the top of the evaporation inner box (41), and the other end of the liquid discharge pipe (30) is connected to the gravel layer (42).

2. The air separation backup liquid drainage system according to claim 1, characterized in that: The air separation backup liquid drainage system further comprises a gas input pipe (50), wherein the gas input pipe (50) is in communication with the gravel layer (42).

3. The air separation backup liquid drainage system according to claim 2, characterized in that: The liquid discharge pipe (30) comprises an evaporation section (31) and a liquid supply section (32); the evaporation section (31) is connected to an external delivery pipe (60) via the liquid supply section (32); one end of the evaporation section (31) passes through an evaporation inner box (41) and extends to the interior of the gravel layer (42); and the gas input pipe (50) is located below the evaporation section (31).

4. The air separation backup liquid drainage system according to claim 3, characterized in that: The evaporation section (31) is provided with a plurality of discharge holes, which are arranged in an array along the axial direction of the evaporation section (31), and the discharge holes are located inside the gravel layer (42).

5. The air separation backup liquid drainage system according to claim 4, characterized in that: The thickness of the gravel layer (42) is 1000 mm to 1500 mm.

6. The air separation backup liquid drainage system according to claim 4, characterized in that: The gas input pipe (50) is provided with a gas source switch valve (51), and the gas source switch valve (51) is located outside the evaporation inner box (41).

7. The air separation backup liquid drainage system according to claim 6, characterized in that: The liquid supply section (32) comprises a liquid nitrogen discharge branch pipe (33) and a liquid oxygen discharge branch pipe (34); the liquid filling pump (20) comprises a liquid nitrogen filling pump (21) and a liquid oxygen filling pump (22); the external delivery pipe (60) comprises a liquid nitrogen external sales pipe (61) and a liquid oxygen external sales pipe (62); the liquid nitrogen external sales pipe (61) and the liquid oxygen external sales pipe (62) are both connected to the air separation backup system (10); The liquid nitrogen filling pump (21) is arranged on the liquid nitrogen external sales pipe (61), and the liquid nitrogen discharge branch pipe (33) is connected to the liquid nitrogen external sales pipe (61); the liquid oxygen filling pump (22) is arranged on the liquid oxygen external sales pipe (62), and the liquid oxygen discharge branch pipe (34) is connected to the liquid oxygen external sales pipe (62); The liquid nitrogen discharge branch pipe (33) and the liquid oxygen discharge branch pipe (34) are both connected to one end of the evaporation section (31).

8. The air separation backup liquid drainage system according to claim 7, characterized in that: The liquid nitrogen discharge branch pipe (33) is provided with a liquid nitrogen spray guide unit (35), the liquid nitrogen discharge branch pipe (33) is connected to the liquid nitrogen external sales pipe (61) through the liquid nitrogen spray guide unit (35), and the liquid nitrogen spray guide unit (35) is connected to opposite sides of the liquid nitrogen filling pump (21); The liquid oxygen discharge branch pipe (34) is provided with a liquid oxygen spray guide unit (36), and the liquid oxygen discharge branch pipe (34) is connected to the liquid oxygen external sales pipe (62) through the liquid oxygen spray guide unit (36). The liquid oxygen spray guide unit (36) is connected to opposite sides of the liquid oxygen filling pump (22).

9. The air separation backup liquid drainage system according to claim 8, characterized in that: The liquid nitrogen external sales pipe (61) is provided with a liquid nitrogen external sales pre-stop valve (63) and a liquid nitrogen external sales post-stop valve (65), wherein the liquid nitrogen external sales pre-stop valve (63) is located between the air separation backup system (10) and the liquid nitrogen external sales unit (35), and the liquid nitrogen external sales post-stop valve (65) is located at the end of the liquid nitrogen external sales pipe (61); the liquid oxygen external sales pipe (62) is provided with a liquid oxygen external sales pre-stop valve (64) and a liquid oxygen external sales post-stop valve (66), wherein the liquid oxygen external sales pre-stop valve (64) is located between the air separation backup system (10) and the liquid oxygen external sales unit (36), and the liquid oxygen external sales post-stop valve (66) is located at the end of the liquid oxygen external sales pipe (62).

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