Device and method for collecting and removing iodine gas

Abstract

The invention relates to the technical field of electric propulsion tests, and provides an iodine gas collecting and removing device and method.The iodine gas collecting and removing device comprises a collecting pipeline, a front valve, a rear valve and a cooling structure; the collecting pipeline is of a tubular structure, the cooling structure is arranged in the collecting pipeline in the circumferential direction of the collecting pipeline or arranged in the collecting pipeline, and the front valve and the rear valve are arranged at the front end and the rear end of the collecting pipeline respectively. And the collecting pipeline is provided with a degassing port. The cavity is formed in the outer wall or the interior of the collection pipeline, the pipeline is cooled, the collection pipeline is heated through the additional heating mechanism, and the valve and the waste gas collection mechanism are supplemented, so that the collection and removal functions of the iodine gas in the collection pipeline are realized, the iodine adsorption and removal method of the iodine gas collection device is simplified, and the collection efficiency is improved. And emission of harmful gas is avoided, and wide applicability is achieved.

Description

Technical Field

[0001] This invention relates to the field of electric propulsion testing technology, and more specifically, to an iodine gas collection and removal device and method. Background Technology

[0002] Iodine is a sublimable substance with certain toxicity and corrosiveness. At normal pressure, iodine has a melting point of 113.7℃ and a boiling point of 182℃, and its condensation temperature is relatively low. Iodine is increasingly used as a working fluid in aerospace electric thrusters. During ground-based vacuum tests, iodine, after participating in the operation of the electric thruster, exists as a gaseous substance in the air. Uncontrolled release of iodine gas could cause air pollution and threaten the health of test personnel; therefore, it is necessary to collect iodine gas.

[0003] The current method for collecting iodine gas is mainly low-temperature sublimation adsorption, followed by wiping or soaking the iodine adsorbed on the condensation wall with alcohol. However, the above method has limitations: (1) Low collection efficiency of single pipeline: The current adsorption pipeline is mainly a single collection pipeline with a limited effective collection area. On the one hand, the adsorption capacity of the large-diameter pipe wall for iodine gas in the center of the pipe is weak; on the other hand, the amount of iodine adsorption and deposition increases in the later stage of small-diameter adsorption, reducing the absorption capacity. (2) Cumbersome iodine removal process: Iodine gas is adsorbed on the wall of the collection pipeline. When further removing iodine, the collection pipeline needs to be dismantled and then soaked or wiped with alcohol separately to remove the iodine adsorbed on the wall. The process is very cumbersome. (3) Multiple dismantling processes of the collection pipeline may reduce the airtightness of the pipeline. Since the collection pipeline is connected to the vacuum chamber and vacuum pump pipeline respectively, multiple dismantling processes may reduce the airtightness of the pipeline connection. In addition, a separate airtightness test is required after each pipeline installation, which reduces the work efficiency. (4) The low-temperature preparation system is complex. To provide the low-temperature conditions for iodine gas adsorption, the low-temperature environment is mainly provided by compressor refrigeration cycle or freezer, and the whole system is quite complex.

[0004] Current iodine gas collection devices suffer from problems such as low iodine gas collection efficiency, cumbersome iodine removal process, reduced pipeline airtightness, and complex low-temperature preparation system. A new iodine gas adsorption and collection structure and method are needed to achieve the adsorption and collection of iodine gas. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this invention is to provide an iodine gas collection and removal device and method.

[0006] An iodine gas collection and removal device according to the present invention includes a collection pipeline, a pre-valve, a post-valve, and a cooling structure;

[0007] The collection pipeline is a tubular structure, the cooling structure is arranged circumferentially along the collection pipeline, and the pre-valve and post-valve are respectively located at the front end and rear end of the collection pipeline; The collection pipeline is equipped with a degassing port.

[0008] An iodine gas collection and removal device according to the present invention includes a collection pipeline, a pre-valve, a post-valve, and a cooling structure; The collection pipeline has a tubular structure, and the cooling structure is located inside the collection pipeline and is in direct contact with iodine gas. The outer wall of the main body of the cooling structure does not contact the inner wall of the collection pipeline. The pre-valve and post-valve are respectively located at the front end and rear end of the collection pipeline. The collection pipeline is equipped with a degassing port.

[0009] The present invention provides a method for collecting and removing iodine gas, comprising the following steps: S1: Open the pre-valve and post-valve, and start the vacuum pump to allow iodine gas to enter the collection pipeline and be cooled and collected by the cooling structure; S2: Close the pre-valve and post-valve and stop the vacuum pump. Stop the cooling process and use the heating mechanism to heat the collection pipeline to ensure that the iodine adsorbed on the pipeline wall is completely vaporized. S3: Open the degassing valve so that the iodine gas is collected through the degassing port.

[0010] Preferably, the two ends of the pre-valve are respectively equipped with a first connector and a second connector, and the first connector and the second connector are respectively connected to one end of the collection pipeline and the vacuum chamber; The rear valve is equipped with a third connector and a fourth connector at both ends, and the third connector and the fourth connector are respectively connected to the collection pipeline and the vacuum pump.

[0011] Preferably, after the iodine gas removal is completed, the pre-valve and post-valve are closed; after the first and third connectors are allowed to be opened, the collection pipeline is removed, cleaned, and then reinstalled or a new collection pipeline is installed.

[0012] Preferably, the cooling structure is cylindrical, including an inner cylindrical wall, an outer cylindrical wall, a coolant inlet, and a coolant outlet, with a cavity formed between the inner and outer cylindrical walls. The coolant inlet and coolant outlet are respectively located at both ends of the cavity.

[0013] Preferably, the cooling structure and the collection pipeline are an integral structure, and the outer wall surface of the collection pipeline directly serves as the inner cylindrical wall surface; The cavity can be either direct current type or spiral type.

[0014] Preferably, the collection pipeline adopts at least one structure selected from multiple branch air pipes, grids, and ribs.

[0015] Preferably, it also includes a heating mechanism, a degassing valve, an iodine waste gas collection mechanism, and branch gas paths; The degassing valve is connected to a degassing port and one end of a branch gas path at its two ends, respectively. The iodine waste gas collection mechanism is a container for storing iodine waste gas and is connected to the other end of the branch gas path.

[0016] Preferably, the heating mechanism is a heating resistance strip, which is externally wrapped around the collection pipe or embedded in the collection pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention constructs a cavity on the outer wall or inside of the collection pipeline and cools the pipeline using a refrigerant. An additional heating mechanism raises the temperature of the collection pipeline, and valves and a waste gas collection mechanism are added to achieve the collection and removal of iodine gas from the pipeline. This simplifies the iodine adsorption and removal methods of iodine gas collection devices, avoids the emission of harmful gases, and has wide applicability. It has promoted the ground testing of iodine-based electric thrusters and contributed to the research and application of electric thrusters.

[0018] 2. The present invention adopts a scheme of isolating valves at both ends. After the collection pipeline completes the adsorption and collection of iodine gas, it can realize the segmented isolation of iodine and avoid the leakage of iodine vapor.

[0019] 3. The present invention uses a jacketed supercooling solution to cool the collection pipeline, which is simple to operate and simplifies the low-temperature preparation device.

[0020] 4. The present invention uses heating and sublimation to vaporize the collected iodine and store it separately. This achieves the removal of adsorbed iodine without disassembling the collection device, thus avoiding airtightness problems caused by frequent disassembly and assembly of the collection device. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram of the collection piping and cooling structure; Figure 2 This is a schematic diagram showing the structure in which the collection pipelines are connected to the vacuum chamber and the vacuum pump, respectively.

[0022] The diagram shows: Collection pipe 1; Degassing port 11; Pre-valve 2; First connector 21; Second connector 22; Post-valve 3; Third connector 31; Fourth connector 32; Cooling structure 4; Inner cylindrical wall surface 41; Outer cylindrical wall surface 42; Cavity 43; Coolant inlet 44; Coolant outlet 45; Vacuum chamber 5; Vacuum pump 6. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0024] Example 1: To address the problems of low iodine gas collection efficiency, cumbersome iodine removal process, reduced pipeline airtightness, and complex low-temperature preparation systems, and to ensure increased iodine gas collection efficiency while reducing system complexity and eliminating the disassembly and reassembly of collection pipelines and the iodine removal process, this invention provides an iodine gas collection and removal device, including a collection pipeline 1, a pre-valve 2, a post-valve 3, and a cooling structure 4. The collection pipeline 1 has a tubular structure, as shown below. Figure 1 , Figure 2 As shown, the cooling structure 4 is arranged circumferentially along the collection pipe 1, and the pre-valve 2 and the post-valve 3 are respectively configured at the front end and the rear end of the collection pipe 1.

[0025] like Figure 2 As shown, the two ends of the pre-valve 2 are respectively equipped with a first connector 21 and a second connector 22. The first connector 21 and the second connector 22 are respectively connected to one end of the collection pipeline 1 and the vacuum chamber 5, and are used to close and connect the gas path connection between the collection pipeline 1 and the vacuum chamber 5.

[0026] Furthermore, the two ends of the rear valve 3 are respectively equipped with a third connector 31 and a fourth connector 32, which are connected to the collection pipeline 1 and the vacuum pump 6 respectively, and are used to close and open the gas path connection between the collection pipeline 1 and the vacuum pump 6.

[0027] After collecting iodine gas, the pre-valve 2 and post-valve 3 can be closed; the first connector 21 and the third connector 31 can be opened, the collection pipeline 1 can be removed, cleaned and reinstalled, or a new collection pipeline 1 can be installed to complete the removal of iodine from the pipeline.

[0028] like Figure 1 As shown, the cooling structure 4 has a cylindrical configuration, including an inner cylindrical wall 41, an outer cylindrical wall 42, a coolant inlet 44, and a coolant outlet 45. A cavity 43 is formed between the inner cylindrical wall 41 and the outer cylindrical wall 42. The cavity 43 can be of the direct flow type or the spiral type.

[0029] Furthermore, the coolant inlet 44 and coolant outlet 45 are respectively disposed at both ends of the cavity 43. The coolant inlet 44 and coolant outlet 45 are both disposed on the side wall of the collection pipe 1 and communicate with the outside of the collection pipe 1 to allow coolant to flow in. The coolant enters the cavity 43 from the coolant inlet 44 and reaches the coolant outlet 45 to cool the collection pipe 1 and collect iodine gas. The inner cylindrical wall 41 is fastened to the outer wall of the gas collection pipe 1. In a preferred embodiment, the cooling structure 4 and the collection pipe 1 are an integral structure, and the outer wall of the collection pipe 1 directly serves as the inner cylindrical wall 41.

[0030] The iodine gas collection and removal device also includes a heating mechanism, a degassing valve, an iodine waste gas collection mechanism, and a branch gas path; the collection pipeline 1 is equipped with a degassing port 11, and the two ends of the degassing valve are respectively connected to the degassing port 11 and one end of the branch gas path; the iodine waste gas collection mechanism is a container for storing iodine waste gas and is connected to the other end of the branch gas path.

[0031] The heating mechanism is a heating resistance strip, which can be externally wrapped or embedded in the collection pipe 1, making close contact with the collection pipe 1 to ensure good heat transfer.

[0032] The present invention also provides a method for collecting and removing iodine gas, which collects and removes iodine adsorbed in a collection pipe 1, comprising the following steps: S1: Open the pre-valve 2 and the post-valve 3, and start the vacuum pump 6. Iodine gas enters the collection pipeline 1 and is cooled and collected by the cooling structure 4. Specifically, the vacuum pump 6 is connected to the vacuum chamber 5 through the collection pipeline 1. The iodine gas collection process is a continuous process. During the continuous pumping of gas from the vacuum chamber 5 by the vacuum pump 6, the iodine gas condenses on the inner wall of the collection pipeline 1 when it passes through the collection pipeline 1.

[0033] S2: Close the pre-valve 2 and post-valve 3 and stop the vacuum pump 6. Stop the cooling process and use the heating mechanism to heat the collection pipeline 1 to ensure that the iodine adsorbed on the pipeline wall is completely vaporized. S3: Open the degassing valve so that the iodine gas flows through the degassing port 11, the degassing valve, and the branch gas path into the iodine waste gas collection mechanism for collection.

[0034] Specifically, the collection pipe 1 can adopt a structure with increased contact area, and can be one or more of the following structures: multi-branch air pipe, grid, rib, etc.

[0035] Example 2: The difference between this embodiment and embodiment 1 is that the cooling structure 4 is built inside the collection pipe 1 and is in direct contact with the iodine gas, while the outer wall surface 42 of the main body of the cooling structure 4 does not contact the inner wall surface of the collection pipe 1.

[0036] The working principle of this invention is as follows: Vacuum pump 6 is connected to vacuum chamber 5 through collection pipe 1 and continuously pumps air from vacuum chamber 5. During the continuous pumping process, iodine gas is cooled and condensed on the inner wall of collection pipe 1 as it passes through it. After the iodine collection is complete, the pre-valve 2 and post-valve 3 are closed, and the operation of vacuum pump 6 is stopped to halt cooling. At this time, a heating mechanism is used to heat collection pipe 1 to ensure that the iodine adsorbed on the pipe wall is completely vaporized. The degassing valve is then opened, allowing the iodine gas to flow through degassing port 11, the degassing valve, and the branch gas path into the iodine waste gas collection mechanism for collection.

[0037] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An iodine gas collecting and removing device, characterized by, It includes a collection pipeline (1), a pre-valve (2), a post-valve (3), and a cooling structure (4); The collection pipe (1) is a tubular structure, the cooling structure (4) is arranged circumferentially along the collection pipe (1), and the front valve (2) and the rear valve (3) are respectively arranged at the front end and the rear end of the collection pipe (1); The collection pipeline (1) is equipped with a degassing port (11).

2. An iodine gas collecting and removing device characterized by, It includes a collection pipeline (1), a pre-valve (2), a post-valve (3), and a cooling structure (4); The collection pipeline (1) is a tubular structure. The cooling structure (4) is located inside the collection pipeline (1) and is in direct contact with iodine gas. The outer wall surface (42) of the main body of the cooling structure (4) does not contact the inner wall surface of the collection pipeline (1). The front valve (2) and the rear valve (3) are respectively located at the front end and the rear end of the collection pipeline (1). The collection pipeline (1) is equipped with a degassing port (11).

3. An iodine gas collection removal method characterized by, Includes the following steps: S1: Open the pre-valve (2) and post-valve (3), and start the vacuum pump (6) to allow iodine gas to enter the collection pipeline (1) and be cooled and collected by the cooling structure (4); S2: Close the pre-valve (2) and the post-valve (3) and stop the vacuum pump (6), stop cooling, and use the heating mechanism to heat the collection pipeline (1) to ensure that the iodine adsorbed on the pipeline wall is completely vaporized; S3: Open the degassing valve so that the iodine gas is collected through the degassing port (11).

4. The iodine gas collecting and removing apparatus according to claim 1 or 2 or the iodine gas collecting and removing method according to claim 3, characterized by, The two ends of the pre-valve (2) are respectively equipped with a first connector (21) and a second connector (22), and the first connector (21) and the second connector (22) are respectively connected to one end of the collection pipeline (1) and the vacuum chamber (5); The rear valve (3) is equipped with a third connector (31) and a fourth connector (32) at both ends, and the third connector (31) and the fourth connector (32) are respectively connected to the collection pipeline (1) and the vacuum pump (6).

5. The iodine gas collecting and removing apparatus according to claim 1 or 2 or the iodine gas collecting and removing method according to claim 3, characterized by, After the iodine gas removal is completed, close the pre-valve (2) and the post-valve (3); allow the first connector (21) and the third connector (31) to be opened, then remove the collection pipeline (1), clean it, and reinstall it or install a new collection pipeline (1).

6. The iodine gas collecting and removing apparatus according to claim 1 or 2 or the iodine gas collecting and removing method according to claim 3, characterized by, The cooling structure (4) is cylindrical, including an inner cylindrical wall (41), an outer cylindrical wall (42), a coolant inlet (44), and a coolant outlet (45), with a cavity (43) formed between the inner cylindrical wall (41) and the outer cylindrical wall (42). The coolant inlet (44) and coolant outlet (45) are respectively located at both ends of the cavity (43).

7. The iodine gas collecting and removing apparatus or the iodine gas collecting and removing method according to claim 6, wherein The cooling structure (4) and the collection pipe (1) are an integral structure, and the outer wall surface of the collection pipe (1) directly serves as the inner cylindrical wall surface (41). The cavity (43) is either direct current type or spiral type.

8. The iodine gas collecting and removing apparatus according to claim 1 or 2 or the iodine gas collecting and removing method according to claim 3, characterized by, The collection pipeline (1) adopts at least one of the following structures: multi-branch air pipe, grid, rib.

9. The iodine gas collecting and removing apparatus according to claim 1 or 2 or the iodine gas collecting and removing method according to claim 3, characterized by, It also includes a heating mechanism, a degassing valve, an iodine waste gas collection mechanism, and branch gas lines; The two ends of the degassing valve are respectively connected with a degassing port (11) and one end of a branch gas path, and the iodine waste gas collecting mechanism is a container for storing iodine waste gas and is connected with the other end of the branch gas path.

10. The iodine gas collecting and removing apparatus or the iodine gas collecting and removing method according to claim 9, wherein The heating mechanism is a heating resistance band, which is externally attached and wound on the collecting pipeline (1) or is embedded in the collecting pipeline (1).

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