Emptying gas recovery device in medical oxygen filling process

Abstract

The invention belongs to the technical field of gas recovery, and particularly relates to an emptying gas recovery device in the medical oxygen filling process. The device is mainly composed of a medical oxygen steel cylinder, a filter, a compressor, a precooler, a liquefaction cooler, a rectifying tower and related pipelines, oxygen is filled into the medical oxygen steel cylinder through a first pipeline, emptying gas of the medical oxygen steel cylinder enters the filter through a second pipeline to be filtered, the filtered gas enters the compressor to be compressed, and the compressed gas enters the precooler to be liquefied. The compressed gas enters a precooler to be precooled, the precooled gas is liquefied under the action of a liquefaction cooler, liquefied air enters a rectifying tower to be rectified through a reboiler, and nitrogen, argon and oxygen are sequentially separated out; the precooler is reasonable in design, the air stroke is greatly prolonged, the cooling unit can fully precool air, and the precooling effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of gas recovery, and in particular relates to a vented gas recovery device in a medical oxygen filling process. Background Art

[0002] The filling of gaseous medical oxygen is generally done by using medical liquid oxygen to pressurize to 14.7MPa through a plunger liquid oxygen pump, then vaporize it into gas through a special vaporizer for medical oxygen, and fill it into a medical oxygen cylinder through a special filling station for medical oxygen. This filling process generally does not cause medical oxygen pollution and complies with the relevant provisions of medical oxygen GMP. During filling, the oxygen content in the pipeline needs to be checked. When the oxygen content reaches 99.6% or above, the medical oxygen filling state can be entered. If it does not meet the standard, it needs to be emptied continuously until it meets the standard before formal filling can be carried out. At the same time, air replacement is required during the oxygen filling process. The medical oxygen cylinders that have been cleaned and disinfected and qualified are moved to the filling station, and the filling heads are connected one by one. The gas distribution valve is opened. The gas will be filled into each cylinder under pressure. When the pressure in the bottle reaches 0.7MPa, the vent valve is opened to empty all the medical oxygen gas in the bottle. This replacement is repeated twice to replace all the air that may exist in the bottle. Therefore, a large amount of vent gas will be discharged through the vent valve during the entire oxygen filling process. At present, the vent gas is not recycled and is directly discharged. Although the oxygen content in the vent gas does not meet the medical standards, the oxygen content in the gas is also quite high. Direct discharge leads to a waste of resources.

[0003] To this end, the patent specification with publication number CN116817541B discloses a vented gas recovery device for a medical oxygen filling process, comprising a distillation tower, a liquid inlet pipe is installed on the distillation tower, the other end of the liquid inlet pipe is connected to an input air source and a recovered gas source, the liquid inlet pipe is used to inject a mixed gas of liquid input air and recovered gas into the distillation tower, a liquid outlet pipe is installed at the bottom of the distillation tower, a reboiler is installed at the other end of the liquid outlet pipe, and the output end of the reboiler is connected to the air inlet pipe; by cooling and regulating the temperature in the top area of ​​the distillation tower until the temperature in the top area is lower than the boiling point of oxygen and higher than the boiling point of nitrogen, the oxygen mixed with nitrogen in the top area is condensed and adheres to the inner wall of the distillation tower in the top area, the oxygen and nitrogen in the top area are separated, and the purity of the nitrogen output in the top area is improved.

[0004] However, this vented gas recovery device in the medical oxygen filling process still has some shortcomings, such as its air precooling efficiency is not ideal, which is not conducive to the rapid liquefaction of subsequent cold air. Therefore, it needs to be optimized and improved. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems existing in the conventional technology and to provide a vented gas recovery device for the medical oxygen filling process.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a vented gas recovery device during a medical oxygen filling process, comprising a medical oxygen cylinder, a filter, a compressor, a precooler, a liquefied cooler and a distillation tower, wherein the input end of the medical oxygen cylinder is connected to a first pipeline for oxygen filling, the venting end of the medical oxygen cylinder is connected to the input end of the filter via a second pipeline, the output end of the filter is connected to the input end of the compressor via a third pipeline, the output end of the compressor is connected to the input end of the precooler via a fourth pipeline, the output end of the precooler is connected to the input end of the liquefied cooler via a fifth pipeline, the output end of the liquefied cooler is connected to the input end of the distillation tower via a sixth pipeline, the first output end of the distillation tower is connected to a seventh pipeline for outputting nitrogen, the second output end of the distillation tower is connected to an eighth pipeline for outputting argon, and the third output end of the distillation tower is connected to a ninth pipeline for outputting oxygen.

[0008] Furthermore, in the above-mentioned vented gas recovery device during the medical oxygen filling process, the outer side of the fifth pipeline is coated with a cold preservation layer.

[0009] Furthermore, in the above-mentioned vented gas recovery device during the medical oxygen filling process, the precooler includes a shell, the interior of the shell is provided with a first spacer ring, a second spacer ring and a third spacer ring in sequence from the outside to the inside, the inner cavity of the shell is divided into a first annular area, a second annular area, a third annular area and a columnar area in sequence from the outside to the inside by the three spacer rings, and the three spacer rings are jointly fixed with a spiral heat exchange tube, one end of the spiral heat exchange tube is equipped with a medium inlet pipe passing through the bottom plate of the shell, and the other end of the spiral heat exchange tube is equipped with a medium outlet pipe passing through the top plate of the shell, and the top plate of the shell is connected to an input interface connected to the first annular area and an output interface connected to the columnar area.

[0010] Furthermore, in the above-mentioned medical oxygen filling process venting gas recovery device, the shell is located on the first spacer ring and is provided with a first connecting port for connecting the first annular area and the second annular area, the shell is located on the second spacer ring and is provided with a second connecting port for connecting the second annular area and the third annular area, and the shell is located on the third spacer ring and is provided with a third connecting port for connecting the third annular area and the columnar area.

[0011] Furthermore, in the above-mentioned vented gas recovery device during the medical oxygen filling process, the first connecting port is located at the lower end of the first spacer ring on a side away from the input interface, the second connecting port is located at the upper end of the second spacer ring on a side away from the first connecting port, and the third connecting port is located at the lower end of the third spacer ring on a side away from the second connecting port.

[0012] Furthermore, in the above-mentioned vented gas recovery device during the medical oxygen filling process, the medium inlet pipe is externally connected to a liquid nitrogen pumping pipe for conveying liquid nitrogen.

[0013] Furthermore, in the above-mentioned vented gas recovery device during the medical oxygen filling process, the first spacer ring, the second spacer ring, the third spacer ring, the spiral heat exchange tube, the medium inlet pipe and the medium outlet pipe are an integrated structure.

[0014] Furthermore, in the above-mentioned vented gas recovery device during the medical oxygen filling process, the first spacer ring, the second spacer ring, the third spacer ring and the shell are an integrated structure, the spiral heat exchange tube, the medium inlet pipe and the medium outlet pipe are an integrated structure, and the first spacer ring, the second spacer ring and the third spacer ring are provided with avoidance holes for avoiding the spiral heat exchange tube.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention is mainly composed of a medical oxygen cylinder, a filter, a compressor, a precooler, a liquefied cooler, a distillation tower and related pipelines. The first pipeline is used to oxygenate the inside of the medical oxygen cylinder. The vented gas of the medical oxygen cylinder enters the filter through the second pipeline for filtration. The filtered gas enters the compressor for compression. The compressed gas enters the precooler for precooling. The precooled gas is liquefied under the action of the liquefied cooler. The liquefied air enters the distillation tower and is rectified by a reboiler to separate nitrogen, argon and oxygen in turn.

[0017] 2. The precooler in the present invention is reasonably designed, and is mainly composed of a shell, a first spacer ring, a second spacer ring, a third spacer ring, a first annular area, a second annular area, a third annular area, a columnar area, a spiral heat exchange tube, a medium inlet tube, a medium outlet tube, an input interface, an output interface, a first connecting port, a second connecting port and a third connecting port. The inner cavity of the shell is reasonably divided into three partitions, and the partitions are connected through staggered connecting ports, so that the air travel between the input interface and the output interface is greatly extended. The cooling unit composed of the spiral heat exchange tube, the medium inlet tube and the medium outlet tube is used to fully precool the air, and the precooling effect is good.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 Schematic diagram of the internal structure of the precooler in the present invention;

[0022] Figure 3 Schematic diagram of the external structure of the precooler in the present invention;

[0023] Figure 4 It is a schematic diagram of the main structure of three spacer rings in the precooler of the present invention;

[0024] Figure 5 It is a schematic diagram of the top view of the structure of three spacer rings in the precooler of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the spiral heat exchange tube, the medium inlet tube, and the medium outlet tube in the present invention;

[0026] In the accompanying drawings, the reference numerals of the various components are as follows:

[0027] 1-medical oxygen cylinder, 2-filter, 3-compressor, 4-precooler, 401-shell, 402-first spacer ring, 403-second spacer ring, 404-third spacer ring, 405-first annular area, 406-second annular area, 407-third annular area, 408-column area, 409-spiral heat exchange tube, 410-medium inlet pipe, 411-medium outlet pipe, 412-input interface, 413-output interface, 414-first connecting port, 415-second connecting port, 416-third connecting port, 5-liquefaction cooler, 6-distillation tower, 7-first pipeline, 8-second pipeline, 9-third pipeline, 10-fourth pipeline, 11-fifth pipeline, 12-sixth pipeline, 13-seventh pipeline, 14-eighth pipeline, 15-ninth pipeline. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 6As shown, this embodiment provides a vented gas recovery device for a medical oxygen filling process, comprising a medical oxygen cylinder 1, a filter 2, a compressor 3, a precooler 4, a liquefied cooler 5 and a distillation tower 6, the input end of the medical oxygen cylinder 1 is connected to a first pipeline 7 for oxygen filling, the venting end of the medical oxygen cylinder 1 is connected to the input end of the filter 2 via a second pipeline 8, the output end of the filter 2 is connected to the input end of the compressor 3 via a third pipeline 9, the output end of the compressor 3 is connected to the input end of the precooler 4 via a fourth pipeline 10, the output end of the precooler 4 is connected to the input end of the liquefied cooler 5 via a fifth pipeline 11, and the output end of the liquefied cooler 5 is connected to the input end of the distillation tower 6 via a sixth pipeline 12. The first output end of the distillation tower 6 is connected to a seventh pipeline 13 for outputting nitrogen, the second output end of the distillation tower 6 is connected to an eighth pipeline 14 for outputting argon, and the third output end of the distillation tower 6 is connected to a ninth pipeline 15 for outputting oxygen.

[0030] In this embodiment, the outer side of the fifth pipeline 11 is coated with a cold-insulating layer.

[0031] In this embodiment, the precooler 4 includes a shell 401, and the interior of the shell 401 is provided with a first spacer ring 402, a second spacer ring 403 and a third spacer ring 404 from the outside to the inside. The inner cavity of the shell 401 is divided into a first annular area 405, a second annular area 406, a third annular area 407 and a columnar area 408 from the outside to the inside by the three spacer rings. The three spacer rings jointly fix a spiral heat exchange tube 409, and one end of the spiral heat exchange tube 409 is equipped with a medium inlet pipe 410 that passes through the bottom plate of the shell 401, and the other end of the spiral heat exchange tube 409 is equipped with a medium outlet pipe 411 that passes through the top plate of the shell 401. The top plate of the shell 401 is connected to an input interface 412 connected to the first annular area 405 and an output interface 413 connected to the columnar area 408.

[0032] In this embodiment, the shell 401 is located on the first spacer ring 402 and is provided with a first connecting port 414 for connecting the first annular area 405 and the second annular area 406; the shell 401 is located on the second spacer ring 403 and is provided with a second connecting port 415 for connecting the second annular area 406 and the third annular area 407; the shell 401 is located on the third spacer ring 404 and is provided with a third connecting port 416 for connecting the third annular area 407 and the columnar area 408.

[0033] In this embodiment, the first connecting port 414 is located at the lower end of the first spacer ring 402 away from the input interface 412, the second connecting port 415 is located at the upper end of the second spacer ring 403 away from the first connecting port 414, and the third connecting port 416 is located at the lower end of the third spacer ring 404 away from the second connecting port 415.

[0034] In this embodiment, the medium inlet pipe 410 is externally connected to a liquid nitrogen pumping pipe for conveying liquid nitrogen.

[0035] One scheme of the present embodiment is: the first spacer ring 402, the second spacer ring 403, the third spacer ring 404, the spiral heat exchange tube 409, the medium inlet pipe 410 and the medium outlet pipe 411 are an integrated structure; another scheme of the present embodiment is: the first spacer ring 402, the second spacer ring 403, the third spacer ring 404 and the shell 401 are an integrated structure, the spiral heat exchange tube 409, the medium inlet pipe 410 and the medium outlet pipe 411 are an integrated structure, and the first spacer ring 402, the second spacer ring 403, the third spacer ring 404 are provided with avoidance holes for avoiding the spiral heat exchange tube 409.

[0036] A specific application of this embodiment is: this device is mainly composed of a medical oxygen cylinder 1, a filter 2, a compressor 3, a precooler 4, a liquefied cooler 5, a distillation tower 6 and related pipelines. The first pipeline 7 is used to fill oxygen into the medical oxygen cylinder 1, and the vented gas of the medical oxygen cylinder 1 enters the filter 2 through the second pipeline 8 for filtration. The filtered gas enters the compressor 3 for compression, and the compressed gas enters the precooler 4 for precooling. The precooled gas is liquefied under the action of the liquefied cooler 5, and the liquefied air enters the distillation tower 6 for distillation using a reboiler to separate nitrogen, argon and oxygen in turn. Among them, the precooler 4 is reasonably designed, and is mainly composed of a shell 401, a first spacer ring 402, a second spacer ring 403, a third spacer ring 404, a first annular area 405, a second annular area 406, a third annular area 407, a columnar area 408, a spiral heat exchange tube 409, a medium inlet pipe 410, a medium outlet pipe 411, an input interface 412, an output interface 413, a first connecting port 414, a second connecting port 415 and a third connecting port 416. The inner cavity of the shell 401 is reasonably divided into three partitions, and the partitions are connected through staggered connecting ports, so that the air travel between the input interface 412 and the output interface 413 is greatly extended. The cooling unit composed of the spiral heat exchange tube 409, the medium inlet pipe 410 and the medium outlet pipe 411 is used to fully precool the air, and the precooling effect is good.

[0037] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A vented gas recovery device for the medical oxygen filling process, characterized in that: It includes a medical oxygen cylinder, a filter, a compressor, a precooler, a liquefied cooler and a distillation tower, wherein the input end of the medical oxygen cylinder is connected to a first pipeline for oxygenation, the venting end of the medical oxygen cylinder is connected to the input end of the filter via a second pipeline, the output end of the filter is connected to the input end of the compressor via a third pipeline, the output end of the compressor is connected to the input end of the precooler via a fourth pipeline, the output end of the precooler is connected to the input end of the liquefied cooler via a fifth pipeline, the output end of the liquefied cooler is connected to the input end of the distillation tower via a sixth pipeline, the first output end of the distillation tower is connected to a seventh pipeline for outputting nitrogen, the second output end of the distillation tower is connected to an eighth pipeline for outputting argon, and the third output end of the distillation tower is connected to a ninth pipeline for outputting oxygen.

2. The vented gas recovery device for the medical oxygen filling process according to claim 1 is characterized in that: The outer side of the fifth pipeline is coated with a cold preservation layer.

3. The vented gas recovery device for the medical oxygen filling process according to claim 2, characterized in that: The precooler includes a shell, the interior of the shell is provided with a first spacer ring, a second spacer ring and a third spacer ring in sequence from the outside to the inside, the inner cavity of the shell is divided into a first annular area, a second annular area, a third annular area and a columnar area in sequence from the outside to the inside by the three spacer rings, and the three spacer rings are jointly fixed with a spiral heat exchange tube, one end of the spiral heat exchange tube is equipped with a medium inlet pipe passing through the bottom plate of the shell, and the other end of the spiral heat exchange tube is equipped with a medium outlet pipe passing through the top plate of the shell, and the top plate of the shell is connected to an input interface connected to the first annular area and an output interface connected to the columnar area.

4. The vented gas recovery device for the medical oxygen filling process according to claim 3 is characterized in that: The shell is located on the first spacer ring and has a first connecting port for connecting the first annular area and the second annular area. The shell is located on the second spacer ring and has a second connecting port for connecting the second annular area and the third annular area. The shell is located on the third spacer ring and has a third connecting port for connecting the third annular area and the columnar area.

5. The vented gas recovery device for the medical oxygen filling process according to claim 4 is characterized in that: The first communication port is located at the lower end of the first spacer ring away from the input interface, the second communication port is located at the upper end of the second spacer ring away from the first communication port, and the third communication port is located at the lower end of the third spacer ring away from the second communication port.

6. The vented gas recovery device for the medical oxygen filling process according to claim 5, characterized in that: The medium inlet pipe is externally connected with a liquid nitrogen pumping pipe for conveying liquid nitrogen.

7. The vented gas recovery device for the medical oxygen filling process according to any one of claims 1 to 6, characterized in that: The first spacer ring, the second spacer ring, the third spacer ring, the spiral heat exchange tube, the medium inlet pipe and the medium outlet pipe are an integrated structure.

8. The vented gas recovery device during the medical oxygen filling process according to any one of claims 1 to 6, characterized in that: The first spacer ring, the second spacer ring, the third spacer ring and the shell are an integrated structure, the spiral heat exchange tube, the medium inlet tube and the medium outlet tube are an integrated structure, and the first spacer ring, the second spacer ring and the third spacer ring are provided with avoidance holes for avoiding the spiral heat exchange tube.

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