Gas collection thermal desorption system
By designing an air heating device and air flow switching device in the gas detection system, rapid heating and heat dissipation of the sampled gas is achieved, which solves the problem of long heating and heat dissipation time in conventional systems and improves detection efficiency.
Patent Information
- Application Number
- CN202420719962.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-09
AI Technical Summary
In conventional gas detection systems, the heating and heat dissipation time of the adsorption column is long, resulting in too long circulation detection time.
A gas collection and heat desorption system is designed, and heats it on the second gas pipeline through an air heating device, and the air flow switching element is used to control the on and off of the adsorption pipe and the heating air, so as to achieve rapid heating and heat dissipation of the sampled gas.
This system can achieve rapid heating and heat dissipation of sampled gas, shorten cycle detection time, and improve detection efficiency.
Smart Images
Figure CN222635925U_ABST
Abstract
Description
Technical Field
[0001] The utility model embodiment relates to the technical field of medical gas detection, and in particular to a gas collection thermal desorption system. Background Art
[0002] In the field of medical gas detection, the gas exhaled by the patient often needs to be adsorbed onto an adsorption column and then heated and discharged for gas detection and analysis.
[0003] The conventional gas adsorption and heating process is as follows: the patient's exhaled gas is first enriched in the adsorption column. Then the adsorption column is heated by a heating rod mounted on the outer wall of the adsorption column to heat the gas. After heating to the required temperature, pure air can be introduced into the adsorption column to blow out the gas that is thermally desorbed on the adsorption tube for subsequent detection and analysis. The adsorption column then dissipates heat and cools down to the initial temperature before the next gas adsorption and heating can be performed, thereby realizing cyclic detection and analysis.
[0004] However, conventional gas heating operations use a heating rod mounted on the adsorption column for heating, and the heating rod takes a long time to heat the adsorption column and the adsorption column takes a long time to dissipate heat, which results in a long cycle detection time. Utility Model Content
[0005] In order to solve the above technical problems or at least partially solve the above technical problems, an embodiment of the utility model provides a gas collection thermal desorption system.
[0006] The embodiment of the utility model provides a gas collection thermal desorption system, comprising an air heating device, a first gas pipeline, a second gas pipeline, an air flow switching member, and at least two adsorption tubes for adsorbing sampled gas;
[0007] The first gas pipeline has a first inlet for sampled gas to flow in and a first outlet for sampled gas to flow out; the second gas pipeline has a second inlet for air to enter, the air heating device is arranged on the second gas pipeline and is used to heat the air flowing into the second gas pipeline, and the second gas pipeline has a second outlet for heated air to be discharged;
[0008] The airflow switching component is used to control all of the adsorption tubes to be connected to one of the first outlet and the second outlet, and to control all of the adsorption tubes to be disconnected from the other of the first outlet and the second outlet; or, the airflow switching component is used to control at least one of two of the adsorption tubes to be connected to one of the first outlet and the second outlet, and to control the other of at least two of the adsorption tubes to be connected to the other of the first outlet and the second outlet.
[0009] In some embodiments, the air heating device includes a heating tube and a heating structure disposed on the heating tube;
[0010] The heating tube is sleeved on the outer wall of the second gas pipeline, or the heating tube is connected to one end of the second gas pipeline where the second outlet is arranged and communicated with the second outlet.
[0011] In some embodiments, the air heating device further comprises a controller electrically connected to the heating structure, the controller being used to control the start and stop of the heating structure;
[0012] And / or, the heating structure is arranged on the inner wall of the heating tube;
[0013] And / or, the heating structure includes a resistance heater or an electromagnetic heater.
[0014] In some embodiments, the air heating device further comprises an air supply structure disposed in the second gas pipeline, so that the air outside the second gas pipeline enters into the second gas pipeline through the second inlet under the pumping action of the air supply structure.
[0015] In some embodiments, the air supply structure is disposed at or near the second inlet.
[0016] In some embodiments, the airflow switching element includes a control valve, which includes a first opening that can communicate with the first outlet, a second opening that can communicate with the second outlet, and at least two third openings that can communicate with corresponding adsorption tubes respectively.
[0017] In some embodiments, all of the adsorption tubes are arranged in parallel, and all of the adsorption tubes are spaced apart along the radial direction of the adsorption tubes.
[0018] In some embodiments, all of the adsorption tubes are located on the same side of the airflow switching component along the length direction of the adsorption tubes, and the adsorption tubes and the second gas pipeline are located on opposite sides of the airflow switching component.
[0019] In some embodiments, the first gas pipeline and the second gas pipeline are located on the same side of the gas flow switching component along the length direction of the adsorption tube.
[0020] In some embodiments, each of the adsorption tubes includes an adsorption column and two adsorption pipes;
[0021] The two adsorption pipes are respectively arranged at two ends of the adsorption column along the length direction of the adsorption tube and are both connected with the inner cavity of the adsorption column. The inner wall surface of the adsorption column forms an adsorption surface for adsorbing the sampled gas.
[0022] Compared with the prior art, the technical solution provided by the embodiment of the utility model has the following advantages:
[0023] The embodiment of the utility model provides a gas collection thermal desorption system, including an air heating device, a first gas pipeline, a second gas pipeline, an airflow switching component, and at least two adsorption tubes for adsorbing sampled gas. The first gas pipeline is provided with a first inlet for sampled gas to flow in and a first outlet for sampled gas to flow out. The second gas pipeline has a second inlet for air to enter, the air heating device is provided on the second gas pipeline and is used to heat the air flowing into the second gas pipeline, the second gas pipeline has a second outlet for heated air to be discharged, and the airflow switching component is provided to control all adsorption tubes to be connected to one of the first outlet and the second outlet, and to control all adsorption tubes to be disconnected from the other of the first outlet and the second outlet. Or, the airflow switching element is used to control one of the at least two adsorption tubes to be connected to one of the first outlet and the second outlet, and to control the other of the at least two adsorption tubes to be connected to the other of the first outlet and the second outlet, so that when the corresponding adsorption tube is connected to the first outlet, the sampling gas can be delivered to the adsorption tube through the first inlet and the second outlet to achieve adsorption and deposition of the gas in the adsorption tube, and when the airflow switching element controls the corresponding adsorption tube to be connected to the second outlet, the heated air can be delivered to the adsorption tube through the second inlet and the second outlet to achieve heating operation of the sampled gas deposited in the adsorption tube, that is, to achieve thermal desorption operation. Compared with the prior art that uses a heating rod to directly heat the adsorption tube to achieve indirect heating of the sampled gas in the adsorption tube, which results in a long heating time and a long heat dissipation time, the embodiment of the utility model realizes the thermal desorption operation of the sampled gas by delivering hot air to the adsorption tube without directly heating the adsorption tube, which can not only achieve rapid heating of the sampled gas, but also make the heat dissipation of the adsorption tube faster after the thermal desorption operation, so as to accelerate the cycle detection efficiency. In addition, the embodiment of the utility model sets up at least two adsorption tubes, and controls the on-off status of each adsorption tube and the first outlet and the second outlet through the airflow switching component, so that all adsorption tubes can perform sampling gas deposition and thermal desorption operations simultaneously or in batches, which can further effectively improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the embodiments of the utility model, and together with the description, are used to explain the principles of the embodiments of the utility model.
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0026] Figure 1 This is a schematic diagram of the structure of the gas collection and thermal desorption system according to an embodiment of the utility model;
[0027] Figure 2 The working diagram of the gas collection thermal desorption system according to the embodiment of the utility model is as follows: Figure 1 ;
[0028] Figure 3 The working diagram of the gas collection thermal desorption system according to the embodiment of the utility model is as follows: Figure 2 ;
[0029] Figure 4 The working diagram of the gas collection thermal desorption system according to the embodiment of the utility model is as follows: Figure 3 ;
[0030] Figure 5 The working diagram of the gas collection thermal desorption system according to the embodiment of the utility model is as follows: Figure 4 .
[0031] Among them, 1. air heating device; 11. heating tube; 2. first gas pipeline; 21. first inlet; 22. first outlet; 3. second gas pipeline; 31. second inlet; 32. second outlet; 4. air flow switching member; 41. first opening; 42. second opening; 43. third opening; 5. adsorption tube; 51. adsorption column; 52. adsorption pipeline; 53. first adsorption tube; 54. second adsorption tube. DETAILED DESCRIPTION
[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the scheme of the embodiments of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0033] In the following description, many specific details are set forth to facilitate a full understanding of the embodiments of the utility model, but the embodiments of the utility model can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the utility model, rather than all of the embodiments.
[0034] Reference Figures 1 to 5As shown, this embodiment provides a gas collection thermal desorption system, including an air heating device 1, a first gas pipeline 2, a second gas pipeline 3, an air flow switching component 4 and at least two adsorption tubes 5 for adsorbing the sampled gas.
[0035] The first gas pipeline 2 has a first inlet 21 for the sampled gas to flow in and a first outlet 22 for the sampled gas to flow out; the second gas pipeline 3 has a second inlet 31 for air to enter, the air heating device 1 is arranged on the second gas pipeline 3 and is used to heat the air flowing into the second gas pipeline 3, and the second gas pipeline 3 has a second outlet 32 for the heated air to be discharged.
[0036] The airflow switching member 4 is used to control all adsorption tubes 5 to be connected to one of the first outlet 22 and the second outlet 32, and to control all adsorption tubes 5 to be disconnected from the other of the first outlet 22 and the second outlet 32. Alternatively, the airflow switching member 4 is used to control one of at least two adsorption tubes 5 to be connected to one of the first outlet 22 and the second outlet 32, and to control the other of at least two adsorption tubes 5 to be connected to the other of the first outlet 22 and the second outlet 32.
[0037] When implementing it, refer to Figure 1 In the left and right directions of the drawings shown, the first gas pipeline 2 and the second gas pipeline 3 can be arranged on the right side of the airflow switching member 4, for example, and at least two adsorption tubes 5 can be arranged on the left side of the airflow switching member 4. In this case, a first inlet 21 for the sampled gas to flow in can be arranged at the right end of the first gas pipeline 2, and a first outlet 22 for the sampled gas to flow out can be arranged at the left end of the second gas pipeline 3. A second inlet 31 for air to enter is arranged at the right end of the second gas pipeline 3, and a second outlet 32 for air heated by the air heating device 1 to flow out is arranged at the left end of the second gas pipeline 3.
[0038] Specifically, refer to Figure 2 and Figure 3 As shown, in one implementation, the specific process of the airflow switching member 4 controlling all adsorption tubes 5 to be connected to one of the first outlet 22 and the second outlet 32 and disconnected from the other of the first outlet 22 and the second outlet 32 is as follows:
[0039] Reference Figure 2 As shown, when the airflow switching element 4 controls all the adsorption tubes 5 to be connected to the first outlet 22 and disconnected from the second outlet 32, the sampled gas flowing into the first gas pipeline 2 and discharged through the first outlet 22 can flow into each adsorption tube 5 respectively. At this time, it can be considered that all the adsorption tubes 5 are performing adsorption deposition or enrichment operations on the sampled gas. The specific flow path of the sampled gas can be referred to Figure 2 As shown by the dotted arrow in .
[0040] After all adsorption tubes 5 have completed the adsorption and deposition operation of the sampled gas, refer to Figure 3 As shown, at this time, the airflow switching component 4 can control the adsorption tubes 5 to be connected to the second outlet 32 and disconnected from the first outlet 22. At this time, all the adsorption tubes 5 no longer receive the sampled gas transported through the first gas pipeline 2, but receive the heated air transported through the second gas pipeline 3. The heated air enters each adsorption tube 5 respectively to heat or thermally desorb the sampled gas deposited in each adsorption tube 5. At the same time, in the process of heating the sampled gas in the adsorption tube 5, the heated air can be discharged toward the outlet end of the adsorption tube 5 under the action of the airflow of the heated air, so that the operator can collect the sampled gas after thermal desorption discharged from the outlet end of the adsorption tube 5 and perform corresponding gas detection and analysis operations. The specific flow path of the heated air can be referred to. Figure 3 As shown by the dotted arrow in .
[0041] It should be noted that, for the above implementation, the airflow switching member 4 usually controls all the adsorption tubes 5 to be connected to the first outlet 22 and disconnected from the second outlet 32 first, so as to first perform the deposition adsorption operation of the sampled gas. Then, all the adsorption tubes 5 are controlled to be connected to the second outlet 32 and disconnected from the first outlet 22, so as to perform the thermal desorption operation of the sampled gas. That is, the above process has the above sequence, so as to ensure that the sampled gas can be reliably detected later.
[0042] In this embodiment, at least two adsorption tubes 5 can simultaneously perform a deposition operation of the sampled gas or a thermal desorption operation of the sampled gas, that is, all adsorption tubes 5 can simultaneously perform a deposition operation or a thermal desorption operation of the sampled gas, so as to improve the detection efficiency.
[0043] Specifically, refer to Figure 4 and Figure 5 As shown, in another implementation, the specific process of the airflow switching member 4 for controlling one of the at least two adsorption tubes 5 to be connected to one of the first outlet 22 and the second outlet 32, and controlling the other of the at least two adsorption tubes 5 to be connected to the other of the first outlet 22 and the second outlet 32 is as follows:
[0044] For the convenience of description, the present embodiment is described by assuming that there are two adsorption tubes 5. For example, it is assumed that the adsorption tube 5 may include a first adsorption tube 53 and a second adsorption tube 54.
[0045] Reference Figure 4As shown, when the airflow switching element 4 controls the first adsorption tube 53 to be connected to the first outlet 22 and disconnected from the second outlet 32, and controls the second adsorption tube 54 to be connected to the second outlet 32 and disconnected from the first outlet 22, the first adsorption tube 53 can transport the sampled gas through the first gas pipeline 2, thereby realizing the adsorption and deposition operation of the sampled gas in the first adsorption tube 53. The specific flow path of the sampled gas can be referred to Figure 4 At the same time, the second adsorption tube 54 can deliver heated air through the second gas pipeline 3, so as to achieve thermal desorption of the sampled gas deposited in the second adsorption tube 54. The specific flow path of the heated air can be referred to Figure 4 As shown by the dashed arrows, the first adsorption tube 53 and the second adsorption tube 54 can perform different operations respectively, so as to realize the two adsorption tubes 5 to perform the deposition and thermal desorption operations of the sampled gas alternately in a cycle, so as to improve the detection efficiency.
[0046] Reference Figure 5 As shown, when the airflow switching element 4 controls the first adsorption tube 53 to be disconnected from the first outlet 22 and connected to the second outlet 32, and controls the second adsorption tube 54 to be disconnected from the second outlet 32 and connected to the first outlet 22, the second adsorption tube 54 can transport the sampled gas through the first gas pipeline 2, thereby realizing the adsorption and deposition operation of the sampled gas in the second adsorption tube 54. The specific flow path of the sampled gas can be referred to Figure 5 At the same time, the first adsorption tube 53 can deliver heated air through the second gas pipeline 3, so as to achieve thermal desorption of the sampled gas deposited in the first adsorption tube 53. The specific flow path of the heated air is shown in FIG. Figure 5 As shown by the solid arrows, the first adsorption tube 53 and the second adsorption tube 54 can perform different operations respectively, so as to realize the two adsorption tubes 5 to perform the deposition and thermal desorption operations of the sampled gas alternately in a cycle, so as to improve the detection efficiency.
[0047] That is to say, in this embodiment, the deposition operation and thermal desorption operation of the sampling gas can also be performed alternately and cyclically through at least two adsorption tubes 5 at the same time, that is, all adsorption tubes 5 alternately perform deposition or thermal desorption operations of the sampling gas, so as to improve the detection efficiency.
[0048] Illustratively, in this embodiment, the sampled gas may be, for example, gas exhaled by a patient.
[0049] In addition, compared with the prior art that uses a heating rod to directly heat the adsorption tube 5 to achieve indirect heating of the sampling gas in the adsorption tube 5, which results in a long heating time and a long heat dissipation time, the present embodiment realizes the thermal desorption operation of the sampling gas by delivering heated air into the adsorption tube 5 without directly heating the adsorption tube 5. This can not only achieve rapid heating of the sampling gas, but also make the heat dissipation of the adsorption tube 5 faster after the thermal desorption operation, so as to speed up the cycle detection efficiency.
[0050] The gas collection thermal desorption system provided in this embodiment realizes the thermal desorption operation of the sampled gas by delivering hot air into the adsorption tube 5 without directly heating the adsorption tube 5, which can not only realize the rapid heating of the sampled gas, but also make the heat dissipation of the adsorption tube 5 faster after the thermal desorption operation, so as to speed up the cycle detection efficiency. In addition, this embodiment sets at least two adsorption tubes 5, and controls the on-off status of each adsorption tube 5 and the first outlet 22 and the second outlet 32 through the airflow switching member 4, so that all adsorption tubes 5 can perform the sampled gas deposition and thermal desorption operations simultaneously or in batches, and then can further effectively improve the detection efficiency.
[0051] Exemplarily, the adsorption tube 5 is configured as follows Figures 1 to 5 The number of adsorption tubes 5 can be set according to the detection requirements, and this embodiment does not specifically limit this. In addition, the adsorption principle and specific structure of the adsorption tube 5 can refer to the description of the relevant technology, which will not be repeated here.
[0052] In some embodiments, the air heating device 1 includes a heating tube 11 and a heating structure disposed on the heating tube 11 .
[0053] The heating pipe 11 is sleeved on the outer wall of the second gas pipeline 3 , or the heating pipe 11 is connected to one end of the second gas pipeline 3 where the second outlet 32 is arranged and communicated with the second outlet 32 .
[0054] In specific implementation, when the heating tube 11 is sleeved on the outer wall of the second gas pipe 3, the heating structure arranged on the heating tube 11 first heats the pipe wall of the second gas pipe 3, so that the second gas pipe 3 transfers the heat to the air flowing in the second gas pipe 3, thereby realizing indirect heating of the air.
[0055] For example, when the heating tube 11 is sleeved on the outer wall of the second gas pipeline 3, in order to ensure that the heating tube 11 quickly heats the tube wall of the second gas pipeline 3, the heating structure on the heating tube 11 can be arranged to be in close contact with the tube wall of the second gas pipeline 3 to achieve direct heat transfer to avoid heat loss. Alternatively, the heating structure on the heating tube 11 can be arranged to achieve heat transfer with the tube wall of the second gas pipeline 3 through a heat-conducting medium, and the heat-conducting medium can be, for example, a heat-conducting glue or a heat-conducting metal.
[0056] Alternatively, when the heating tube 11 is connected to one end of the second gas pipeline 3 where the second outlet 32 is set, the heating tube 11 can be connected to the second gas pipeline 3 to form a complete pipeline structure. At this time, the air flowing into the second gas pipeline 3 can continue to flow along the second gas pipeline 3 and finally flow into the heating tube 11. The air in the heating tube 11 is directly heated by the heating structure on the heating tube 11, so that the air can be further heated rapidly to improve the heating efficiency.
[0057] For example, when the heating tube 11 is connected to one end of the second gas pipeline 3 where the second outlet 32 is set, the diameter of the heating tube 11 can be set to be consistent with the diameter of the second gas pipeline 3, and the two can be connected and fixed by bonding or welding.
[0058] Reference Figures 1 to 5 As shown, in some embodiments, the air heating device 1 further includes a controller electrically connected to the heating structure, and the controller is used to control the start and stop of the heating structure.
[0059] That is to say, when it is necessary to heat the air in the second gas pipeline 3, the heating structure can be controlled to start by the controller; when it is not necessary to heat the air in the second gas pipeline 3, the heating structure can be controlled to stop working by the controller to realize automatic control of the heating structure.
[0060] In some embodiments, in order to further improve the heating efficiency of the heating structure on the pipe wall of the second gas pipe 3 or on the air directly flowing through the heating pipe 11, the heating structure can be set on the inner wall of the heating pipe 11 to shorten the heat transfer distance between the heating structure and the pipe wall of the second gas pipe 3 or the heat transfer distance between the heating structure and the air in the heating pipe 11, thereby effectively improving the heating efficiency.
[0061] Alternatively, in other implementations, the heating structure may also be disposed on the outer wall of the heating tube 11 .
[0062] Exemplarily, the heating structure includes a resistive heater or an electromagnetic heater.
[0063] In some embodiments, the air heating device 1 also includes an air supply structure arranged in the second gas pipeline 3, so that the air outside the second gas pipeline 3 enters the second gas pipeline 3 through the second inlet 31 under the pumping action of the air supply structure, thereby accelerating the flow of air into the second gas pipeline 3 or accelerating the flow speed of air in the second gas pipeline 3.
[0064] Exemplarily, the air supply structure may be a fan, with the suction side of the fan facing the outside of the second gas pipeline 3 and the blowing side of the fan facing the inside of the second gas pipeline 3, so that the external air is accelerated to enter the second gas pipeline 3 and can be accelerated to flow in the second gas pipeline 3 and then discharged through the second outlet 32. Alternatively, the air supply structure may also be a vacuum pump, for example.
[0065] In order to more effectively allow external air to enter the second gas duct 3 under the action of the air supply structure, the air supply structure can be arranged at or near the second inlet 31 to shorten the distance between the air supply structure and the second inlet 31, that is, the distance between the air supply structure and the external air can be reduced, and then the external air can be effectively adsorbed into the second gas duct 3.
[0066] Reference Figures 1 to 5 As shown, in some embodiments, the airflow switching element 4 includes a control valve, which includes a first opening 41 that can be connected to the first outlet 22, a second opening 42 that can be connected to the second outlet 32, and at least two third openings 43 that can be connected to corresponding adsorption tubes 5 respectively.
[0067] That is, the connection and disconnection conditions between each third opening 43 and the first opening 41 and the second opening 42 are controlled by the control valve, and then the connection and disconnection conditions between each adsorption tube 5 and the first outlet 22 and the second outlet 32 are controlled.
[0068] For example, when there are two adsorption tubes 5, the third openings 43 are set to two, so the control valve at this time may be a four-way valve. Or when there are three adsorption tubes 5, the third openings 43 are set to three, so the control valve at this time may be a five-way valve. The specific type of the control valve depends on the number of adsorption tubes 5.
[0069] Reference Figures 1 to 5 As shown, in some embodiments, all adsorption tubes 5 are arranged in parallel, and all adsorption tubes 5 are arranged at intervals along the radial direction of the adsorption tubes 5, so that the arrangement of all adsorption tubes 5 is more regular and beautiful, and it is convenient for operators to collect the sampled gas after thermal desorption discharged from each adsorption tube 5.
[0070] Reference Figures 1 to 5As shown, in some embodiments, all adsorption tubes 5 are located on the same side of the airflow switching member 4 along the length direction of the adsorption tubes 5 , and the adsorption tubes 5 and the second gas pipeline 3 are located on opposite sides of the airflow switching member 4 .
[0071] That is to say, by arranging all the adsorption tubes 5 on the same side of the airflow switching component 4, and then arranging the adsorption tubes 5 and the second gas pipeline 3 on different sides of the airflow switching component 4, a reasonable position arrangement can be achieved according to the different operating functions or roles of the adsorption tubes 5 and the second gas pipeline 3, so as to facilitate the operator to perform corresponding operations.
[0072] Reference Figures 1 to 5 As shown, in some embodiments, the first gas pipeline 2 and the second gas pipeline 3 are located on the same side of the airflow switching component 4 along the length direction of the adsorption tube 5, which not only makes the appearance of the gas collection thermal desorption system more beautiful and regular, but also facilitates the corresponding air and sampling gas input operations on the same side of the airflow switching component 4.
[0073] Reference Figures 1 to 5 As shown, in some embodiments, each adsorption tube 5 includes an adsorption column 51 and two adsorption pipes 52 .
[0074] Two adsorption pipes 52 are respectively arranged at two ends of the adsorption column 51 along the length direction of the adsorption tube 5 and are both connected to the inner cavity of the adsorption column 51 . The inner wall surface of the adsorption column 51 forms an adsorption surface for adsorbing the sampled gas.
[0075] In specific implementation, it is set that two adsorption pipes 52 can be along Figure 1 The left and right directions shown are arranged on both sides of the adsorption column 51. At this time, the sampling gas discharged through the first outlet 22 can enter the adsorption column 51 through the adsorption pipe 52 on the right and be adsorbed and deposited on the adsorption surface. After the adsorption and deposition are completed, the heated air discharged through the second outlet 32 enters the adsorption column 51 through the adsorption pipe 52 on the right to heat and blow the sampling gas on the adsorption surface. Finally, the heated sampling gas is discharged through the outlet end of the adsorption pipe 52 on the left and then collected to facilitate subsequent detection and analysis operations of the sampling gas.
[0076] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0077] The above description is only a specific implementation of the embodiment of the utility model, so that those skilled in the art can understand or implement the embodiment of the utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the embodiment of the utility model. Therefore, the embodiment of the utility model will not be limited to these embodiments described herein, but will conform to the widest range consistent with the principles and novel features of the embodiment of the utility model described herein.
Claims
1. A gas collection thermal desorption system, characterized in that: It comprises an air heating device (1), a first gas pipeline (2), a second gas pipeline (3), an air flow switching component (4), and at least two adsorption tubes (5) for adsorbing sampled gas; The first gas pipeline (2) has a first inlet (21) for the sampled gas to flow in and a first outlet (22) for the sampled gas to flow out; the second gas pipeline (3) has a second inlet (31) for the air to flow in, the air heating device (1) is arranged on the second gas pipeline (3) and is used to heat the air flowing into the second gas pipeline (3), and the second gas pipeline (3) has a second outlet (32) for the heated air to be discharged; The airflow switching component (4) is used to control all of the adsorption tubes (5) to be connected to one of the first outlet (22) and the second outlet (32), and to control all of the adsorption tubes (5) to be disconnected from the other of the first outlet (22) and the second outlet (32); or, the airflow switching component (4) is used to control at least one of the two adsorption tubes (5) to be connected to one of the first outlet (22) and the second outlet (32), and to control the other of the two adsorption tubes (5) to be connected to the other of the first outlet (22) and the second outlet (32).
2. The gas collection thermal desorption system according to claim 1, characterized in that: The air heating device (1) comprises a heating tube (11) and a heating structure arranged on the heating tube (11); The heating tube (11) is sleeved on the outer wall of the second gas pipeline (3), or the heating tube (11) is connected to one end of the second gas pipeline (3) where the second outlet (32) is arranged and communicates with the second outlet (32).
3. The gas collection thermal desorption system according to claim 2, characterized in that: The air heating device (1) further comprises a controller electrically connected to the heating structure, the controller being used to control the start and stop of the heating structure; And / or, the heating structure is arranged on the inner wall of the heating tube (11); And / or, the heating structure includes a resistance heater or an electromagnetic heater.
4. The gas collection thermal desorption system according to claim 1, characterized in that: The air heating device (1) further comprises an air supply structure arranged in the second gas pipeline (3), so that the air outside the second gas pipeline (3) can enter the second gas pipeline (3) through the second inlet (31) under the pumping action of the air supply structure.
5. The gas collection thermal desorption system according to claim 4, characterized in that: The air supply structure is arranged at the second inlet (31) or close to the second inlet (31).
6. The gas collection thermal desorption system according to any one of claims 1 to 5, characterized in that: The airflow switching element (4) comprises a control valve, which comprises a first opening (41) that can communicate with the first outlet (22), a second opening (42) that can communicate with the second outlet (32), and at least two third openings (43) that can respectively communicate with corresponding adsorption tubes (5).
7. The gas collection thermal desorption system according to any one of claims 1 to 5, characterized in that: All the adsorption tubes (5) are arranged in parallel, and all the adsorption tubes (5) are arranged at intervals along the radial direction of the adsorption tubes (5).
8. The gas collection thermal desorption system according to claim 7, characterized in that: All the adsorption tubes (5) are located on the same side of the airflow switching component (4) along the length direction of the adsorption tubes (5), and the adsorption tubes (5) and the second gas pipeline (3) are located on opposite sides of the airflow switching component (4).
9. The gas collection thermal desorption system according to claim 8, characterized in that: The first gas pipeline (2) and the second gas pipeline (3) are located on the same side of the gas flow switching component (4) along the length direction of the adsorption tube (5).
10. The gas collection thermal desorption system according to any one of claims 1 to 5, characterized in that: Each of the adsorption tubes (5) comprises an adsorption column (51) and two adsorption pipes (52); The two adsorption pipes (52) are arranged at the two ends of the adsorption column (51) along the length direction of the adsorption tube (5) and are both connected to the inner cavity of the adsorption column (51). The inner wall surface of the adsorption column (51) forms an adsorption surface for adsorbing the sampled gas.