Separation Device and Separation Method for Mixed Gas

Abstract

The present invention provides a separation device and a separation method for a mixed gas, which relate to the technical field of mixed gas separation and detection; the separation device includes an adsorption pipeline, a gas adsorption structure, and a heating mechanism; a plurality of adsorption pipelines are connected in sequence, one of the adsorption pipelines is provided with a gas inlet for the mixed gas to enter, and another adsorption pipeline is provided with a gas outlet for discharging the gas; a plurality of gas adsorption structures are respectively installed in a plurality of adsorption pipelines one by one, and each gas adsorption structure respectively adsorbs one of the multiple gases in the mixed gas; a plurality of heating mechanisms are in one-to-one correspondence with the plurality of adsorption pipelines and are used for heating the adsorption pipelines. The present invention realizes the separation purpose by sequentially adsorbing various gases to be separated in the mixed gas, and can release the adsorbed gas by heating. Not only is the gas separation effect better than the existing chromatographic column separation method, but also the separation efficiency is significantly improved, which is beneficial to subsequent detection.

Description

Technical Field

[0001] The present invention relates to the technical field of mixed gas separation and detection, and particularly to a separation device and a separation method for a mixed gas. Background Art

[0002] The existing separation device for mixed gas fills or sprays special materials in a chromatographic column. These special materials have different attractions to different gas molecules. Therefore, during the flow of the mixed gas in the pipeline, the flow rates of different gases gradually change. After flowing through a relatively long pipeline, different gases are gradually separated.

[0003] Since the existing chromatographic column separates by the different flow rates of different gases in the pipeline, the separation effect is not ideal, and the situation of incomplete separation often occurs; moreover, it is necessary to make the gas flow through as long a length as possible within a limited volume, so the pipeline diameter is very thin, which not only results in a low gas flow rate, causing low separation efficiency, but also easily causes pipeline blockage when the gas passes through, and only allows a small amount of the gas to be measured to enter, affecting the detection efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a separation device for a mixed gas and a separation method using the device, so as to solve the problems of poor separation effect, low separation efficiency, and affecting the detection efficiency of the existing chromatographic column.

[0005] To solve the above technical problems, the present invention first provides a separation device for a mixed gas, and the specific technical solution is as follows:

[0006] A separation device for a mixed gas includes an adsorption pipeline, a gas adsorption structure, and a heating mechanism; a plurality of the adsorption pipelines are connected in sequence, one of the adsorption pipelines is provided with a gas inlet for the mixed gas to enter, and another adsorption pipeline is provided with a gas outlet for discharging the gas; a plurality of gas adsorption structures are respectively installed in a plurality of the adsorption pipelines, and each of the gas adsorption structures respectively adsorbs one of a variety of gases in the mixed gas; a plurality of the heating mechanisms are respectively matched with a plurality of the adsorption pipelines and are used for heating the adsorption pipelines.

[0007] Further, the multiple adsorption pipelines include a first adsorption pipeline, a second adsorption pipeline, and a third adsorption pipeline that are connected in sequence; the first adsorption pipeline is provided with the gas inlet, the third adsorption pipeline is provided with a gas outlet, and an exhaust pipeline is connected to the gas outlet; a first valve body is arranged between the first adsorption pipeline and the second adsorption pipeline, and the first valve body is used to open and close the connection between the first adsorption pipeline and the second adsorption pipeline; a second valve body is arranged between the second adsorption pipeline and the third adsorption pipeline, and the second valve body is used to open and close the connection between the second adsorption pipeline and the third adsorption pipeline; a third valve body is arranged on the exhaust pipeline, and the third valve body is used to open and close the exhaust pipeline.

[0008] Further, the first valve body is connected to the third valve body through a first air outlet pipeline, the first valve body is used to open and close the inlet of the first air outlet pipeline, and the third valve body is used to open and close the outlet of the first air outlet pipeline.

[0009] Further, a fourth valve body is arranged on the exhaust pipeline, the second valve body is connected to the fourth valve body through a second air outlet pipeline, the second valve body is used to open and close the inlet of the second air outlet pipeline, and the fourth valve body is used to open and close the outlet of the second air outlet pipeline.

[0010] Further, the exhaust pipeline has an air inlet end and an air outlet end, the air inlet end is communicated with the gas outlet, and a gas detector is connected to the air outlet end.

[0011] Further, the number of the adsorption pipelines is X, and the types of gases to be separated from the mixed gas are Y, wherein Y = X + 1.

[0012] Further, the adsorption pipeline is a U-shaped pipe.

[0013] Further, a temperature detection mechanism and a control mechanism are further included; the multiple temperature detection mechanisms are respectively connected to the multiple adsorption pipelines in one-to-one correspondence and are used to detect the temperature of the adsorption pipelines; the control mechanism is respectively connected to the temperature detection mechanism and the heating mechanism, and the control mechanism is used to open and close the heating mechanism.

[0014] Further, a heat dissipation mechanism is further included, and the heat dissipation mechanism is used to cool the adsorption pipeline.

[0015] In addition, the present invention further provides a gas separation method, including the following steps: gas adsorption: passing the mixed gas through a plurality of gas adsorption structures in sequence, and each of the gas adsorption structures respectively adsorbs one of the multiple gases in the mixed gas; gas discharge: first discharging the mixed gas after being adsorbed and filtered, and then heating and discharging the adsorbed gas.

[0016] According to the separation device and method of the mixed gas provided by the present invention, by sequentially adsorbing various gases to be separated in the mixed gas, the separation purpose is achieved, and the adsorbed gas can be released by heating. The separation process does not require the gas to pass through a long and thin pipeline. Not only is the gas separation effect better than the existing chromatographic column separation method, but also the separation efficiency is significantly improved, which is beneficial to subsequent detection. Brief Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the working principle and the connection of each component of the separation device for the mixed gas provided by the embodiment of the present invention;

[0019] Figure 2 It is a partial structural schematic diagram of the separation device for the mixed gas provided by the embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the U-shaped tube of the separation device for the mixed gas provided by the embodiment of the present invention;

[0021] Figure 4 It is a schematic flowchart of the separation method for the mixed gas provided by the embodiment of the present invention.

[0022] Icon:

[0023] 1 - First adsorption pipeline; 101 - Gas inlet; 2 - Second adsorption pipeline; 3 - Third adsorption pipeline; 301 - Gas outlet; 4 - Gas adsorption structure; 5 - Exhaust pipeline; 501 - Intake end; 502 - Outlet end; 6 - Gas detector; 7 - First valve body; 8 - Second valve body; 9 - Third valve body; 10 - Fourth valve body; 11 - First dryer; 12 - Second dryer; 13 - Third dryer; 14 - Temperature detection mechanism; 15 - Heat dissipation mechanism; 16 - Housing; 17 - Clamping mechanism; Detailed Embodiments

[0024] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Since the chromatographic column separates by the different flow rates of different gases in the pipeline, the separation effect is not ideal, and the situation of incomplete separation often occurs; moreover, the chromatographic column needs to make the gas flow through as long a length as possible within a limited volume, so the pipeline diameter is very thin, and the gas is likely to cause pipeline blockage when passing through; and because the pipeline diameter is thin and the gas flow rate is low, the time required for gas separation is relatively long, about 15 min; and the pipeline only allows a small amount of the gas to be measured to enter. When the gas volume is large, it is easy to cause the separation device to be overloaded and unable to complete the separation, and the maximum allowable volume of the gas to be measured is not more than 1 mL. In view of this, this embodiment provides a separation device for a mixed gas, which realizes the separation of the mixed gas by changing the separation principle of the mixed gas to achieve a better separation effect and efficiency.

[0028] Combined with the attached Figure 1 As shown (the arrows in the figure are the flow directions of the mixed gas), the separation device for the mixed gas of this embodiment includes an adsorption pipeline, a gas adsorption structure 4, and a heating mechanism (not shown in the figure); the multiple adsorption pipelines of this embodiment are connected in sequence. One of the adsorption pipelines is provided with a gas inlet 101 for the mixed gas to enter, and another adsorption pipeline is provided with a gas outlet 301 for discharging the gas. The gas outlet 301 is connected to a detector through an exhaust pipeline 5. The gas after being detected by the detector is finally discharged outside the device. Specifically, the exhaust pipeline 5 of this embodiment has an inlet end 501 and an outlet end 502. The inlet end 501 of this embodiment is communicated with the gas outlet 301, and the outlet end 502 is connected to a gas detector 6.

[0029] The multiple gas adsorption structures 4 of this embodiment are respectively installed in multiple adsorption pipelines one by one. The material of the gas adsorption structure 4 is preferably a polymer material with good adsorption effect, such as zeolites like A zeolite, Y zeolite, beta zeolite, ZSM-5, FER, MEL, etc. Each gas adsorption structure 4 respectively adsorbs one of the multiple gases in the mixed gas, and each adsorption structure has a different adsorption function, or rather, the types of gases adsorbed by each adsorption structure are different.

[0030] The multiple heating mechanisms of this embodiment are respectively matched with the multiple adsorption pipelines one by one and are used to heat the adsorption pipelines. In specific applications, the heating step is generally after the mixed gas is completely adsorbed, and then each adsorption pipeline is heated in sequence to release the adsorbed gas. Specifically, the heating mechanism can be an insulating heating wire installed in the adsorption pipeline.

[0031] When using the gas separation device for mixed gas of this embodiment to separate gases, it is necessary to adsorb various gases to be separated in the mixed gas in sequence, or rather, to make the mixed gas pass through multiple adsorption pipelines in sequence to achieve the purpose of separating gases one by one, and the adsorbed gas can be released by heating. The separation process does not require the gas to pass through a long and thin pipeline. Not only is the gas separation effect better than the existing chromatographic column separation method, but also the separation efficiency is significantly improved, which is beneficial for subsequent detection. In addition, since the adsorption principle is used for mixed gas separation, the separation time interval of different gases can be freely set, and the complete separation of different gases can be achieved. Through the above structural design, the pipeline diameter of the separation device of this embodiment can be up to 10 mm at most, which is not easy to cause pipeline blockage, and a relatively large carrier gas flow can be allowed, reducing the separation time to a minimum of 5 min, and the maximum allowable volume of the gas to be measured can be up to 20 mL.

[0032] Combined with the attached Figure 1 As shown, in order to better understand the mixed gas separation device of this embodiment, the multiple adsorption pipelines in the figure of this embodiment are defined as the first adsorption pipeline 1, the second adsorption pipeline 2, and the third adsorption pipeline 3 that are connected in sequence. Of course, the specific number of adsorption pipelines is determined according to the separation requirements; the first adsorption pipeline 1 of this embodiment is provided with the above-mentioned gas inlet 101, and the third adsorption pipeline 3 of this embodiment is provided with the above-mentioned gas outlet 301.

[0033] In order to facilitate the control of the gas flow and temporary storage, and prevent the mixed gas adsorbed into the adsorption structure from directly mixing back into the filtered mixed gas through the pipeline, in this embodiment, a first valve body 7 is provided between the first adsorption pipeline 1 and the second adsorption pipeline 2. The first valve body 7 is used to open and close the connection between the first adsorption pipeline 1 and the second adsorption pipeline 2. And a second valve body 8 is provided between the second adsorption pipeline 2 and the third adsorption pipeline 3 in this embodiment. The second valve body 8 is used to open and close the connection between the second adsorption pipeline 2 and the third adsorption pipeline 3. In addition, in order to facilitate the control of the outlet gas, a third valve body 9 is provided on the exhaust pipeline 5 of this embodiment. The third valve body 9 is used to open and close the exhaust pipeline 5.

[0034] Preferably, the first valve body 7 and the third valve body 9 in this embodiment are both three-way valves, and the first valve body 7 is connected to the third valve body 9 through a first outlet pipeline. That is, the three interfaces of the first valve body 7 are respectively connected to the outlet of the first adsorption pipeline 1, the inlet of the second adsorption pipeline 2, and the inlet of the first outlet pipeline. The three interfaces of the third valve body 9 are respectively connected to the outlet of the exhaust pipeline 5, the inlet of the detector, and the outlet of the first outlet pipeline. When the first adsorption pipeline 1 completes adsorption, the first valve body 7 closes the connection between the first adsorption pipeline 1 and the second adsorption pipeline 2 to prevent the gas in the first adsorption pipeline 1 from returning to the mixed gas again. After the gas separation is completed, the first adsorption pipeline 1 and the gas adsorption structure 4 therein are heated by a heating mechanism. At this time, the connection between the first adsorption pipeline 1 and the first outlet pipeline is opened through the first valve body 7, and then the adsorbed gas is discharged.

[0035] Similarly, the second valve body 8 in this embodiment is also a three-way valve, and a fourth valve body 10 is provided on the exhaust pipeline 5. The fourth valve body 10 is also a three-way valve. The second valve body 8 is connected to the fourth valve body 10 through a second outlet pipeline. Specifically, the three interfaces of the second valve body 8 in this embodiment are respectively connected to the second adsorption pipeline 2, the third adsorption pipeline 3, and the inlet of the second outlet pipeline. The three joints of the fourth valve body 10 in this embodiment are respectively connected to a part of the exhaust pipeline 5, another part of the exhaust pipeline 5, and the outlet of the second outlet pipeline. By switching the second valve body 8, the connection between the second adsorption pipeline 2 and the third adsorption pipeline 3 can be opened and closed. By switching the fourth valve body 10, the connection between the second adsorption pipeline 2 and the exhaust pipeline 5 can be opened and closed. Of course, the valve body structure and layout form in this embodiment are not limited to this, as long as the above switching function can be realized.

[0036] Preferably, in order to realize the drying of the outlet gas, a first dryer 11 is further provided on the first outlet pipeline in this embodiment. In addition, a second dryer 12 is provided between the second adsorption pipeline 2 and the third adsorption pipeline 3, and a third dryer 13 is provided between the third adsorption pipeline 3 and the exhaust pipeline 5.

[0037] Based on the above structure, as a preferred embodiment of this embodiment, the number of adsorption pipelines in this embodiment is also designed. When the number of adsorption pipelines is X and the types of gases to be separated in the mixed gas are Y, where Y = X + 1, or equivalently X = Y - 1. This design is considered such that if there are Y types of gases to be separated, then only Y - 1 types need to be separated, and the remaining one type of gas to be separated can be directly discharged by itself without the need for adsorption design, so as to simplify the structure and reduce costs.

[0038] Specifically, taking the mixed gas including CO2, SO2, gaseous H2O, and N2 as an example, CO2, SO2, gaseous H2O, and N2 are all circulated through a stable carrier gas flow. That is to say, the carrier gas flow (which can be He or Ar) drives the above-mentioned several gases to circulate in the separation device. Based on the above gas types, in this embodiment, the gas adsorption structure 4 in the first adsorption pipeline 1 can be selected as an adsorption material for SO2, the gas adsorption structure 4 in the second adsorption pipeline 2 can be selected as an adsorption material for gaseous H2O, and the gas adsorption structure 4 in the third adsorption pipeline 3 can be selected as an adsorption material for gaseous CO2. Among them, N2 is directly discharged from the outlet without being adsorbed.

[0039] Based on the above structure, combined with the attached Figure 2 shown (only a partial structure of the device is shown in the figure), the separation device for the mixed gas in this embodiment further includes a temperature detection mechanism 14 and a control mechanism (not shown in the figure); the temperature detection mechanism 14 can be a temperature sensor, and multiple temperature detection mechanisms 14 are respectively connected to multiple adsorption pipelines in one-to-one correspondence and are used to detect the temperature of the adsorption pipelines; the control mechanism in this embodiment is respectively connected to the temperature detection mechanism 14 and the heating mechanism, and the control mechanism is used to open and close the heating mechanism, and the control mechanism can receive the information detected by the temperature detection mechanism 14 and increase or decrease the heating temperature of the heating mechanism according to the detected temperature data. The control mechanism in this embodiment can be an existing controller or processor, and as long as it is any structure that can receive signals, perform data processing and analysis, and send control instructions, it can be used as the control mechanism in this embodiment.

[0040] In addition, in order to improve the cooling efficiency of each pipeline after heating, the separation device in this embodiment further includes a heat dissipation mechanism 15. The heat dissipation mechanism 15 can be a heat dissipation fan or the like, and is used to cool the adsorption pipelines through the heat dissipation mechanism 15, so that each adsorption pipeline can be quickly cooled, facilitating the subsequent gas separation operation. And in order to improve the integrity of the device, multiple adsorption pipelines in this embodiment are installed in a housing 16 together, and the adsorption pipelines are fixed and limited by a clamping mechanism 17. It should be noted that this is not the main improvement of the separation device for the mixed gas in this embodiment, so this embodiment will not describe it in too much detail.

[0041] In addition, combined with the attachedFigure 3 As shown, in this embodiment, the adsorption pipeline is designed as a U-shaped pipe. The U-shaped pipe can provide a longer gas flow path under the same volume, thereby improving the adsorption effect.

[0042] Combined with the attached Figure 4 As shown, based on the above separation device, the present invention also provides a gas separation method using the separation device, including the following steps:

[0043] Gas adsorption: Pass the mixed gas through a plurality of gas adsorption structures 4 in sequence, and each of the gas adsorption structures 4 selectively adsorbs one of the multiple gases in the mixed gas;

[0044] Gas discharge: First discharge the mixed gas after being adsorbed and filtered, and then heat to discharge the adsorbed gas.

[0045] Among them, in the gas adsorption of this embodiment, the adsorption is carried out in sequence through the above-mentioned gas adsorption structure 4. The adsorption order of multiple gases is determined according to the gas adsorption structure 4 in each adsorption pipeline, and there are no excessive requirements.

[0046] The specific process of the separation method of this embodiment is as follows: In a normal temperature environment, the mixed gas is passed through a plurality of adsorption pipelines filled with gas adsorption structures 4 in sequence by a stable carrier gas flow. Each gas adsorption structure 4 has a selective adsorption effect, and then the filtered gas is discharged. When it is necessary to release the adsorbed gas, the adsorption pipeline is heated separately, so that the adsorbed gas in each adsorption pipeline is released separately, thereby realizing the separation of different gases. After all the gases are discharged, the heat dissipation mechanism 15 cools down the adsorption pipeline to restore the device to room temperature, and prepares to adsorb and release the gas again, repeating this cycle.

[0047] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A separation device for a mixed gas, characterized in that, It includes an adsorption pipeline, a gas adsorption structure, and a heating mechanism; A plurality of the adsorption pipelines are connected in sequence. One of the adsorption pipelines is provided with a gas inlet for the mixed gas to enter, and another adsorption pipeline is provided with a gas outlet for discharging gas; A plurality of gas adsorption structures are respectively installed in a plurality of the adsorption pipelines one by one. Each of the gas adsorption structures respectively adsorbs one of the multiple gases in the mixed gas; A plurality of the heating mechanisms are respectively matched with a plurality of the adsorption pipelines one by one and are used for heating the adsorption pipelines; The plurality of the adsorption pipelines include a first adsorption pipeline, a second adsorption pipeline, and a third adsorption pipeline that are connected in sequence; The first adsorption pipeline is provided with the gas inlet, the third adsorption pipeline is provided with a gas outlet, and the gas outlet is connected with an exhaust pipeline; A first valve body is arranged between the first adsorption pipeline and the second adsorption pipeline. The first valve body is used for opening and closing the connection between the first adsorption pipeline and the second adsorption pipeline; A second valve body is arranged between the second adsorption pipeline and the third adsorption pipeline. The second valve body is used for opening and closing the connection between the second adsorption pipeline and the third adsorption pipeline; A third valve body is arranged on the exhaust pipeline. The third valve body is used for opening and closing the exhaust pipeline; The first valve body is connected with the third valve body through a first air outlet pipeline. The first valve body is used for opening and closing the inlet of the first air outlet pipeline, and the third valve body is used for opening and closing the outlet of the first air outlet pipeline; A fourth valve body is arranged on the exhaust pipeline. The second valve body is connected with the fourth valve body through a second air outlet pipeline. The second valve body is used for opening and closing the inlet of the second air outlet pipeline, and the fourth valve body is used for opening and closing the outlet of the second air outlet pipeline; The first valve body, the second valve body, the third valve body, and the fourth valve body are all three-way valves.

2. The separation device for the mixed gas according to claim 1, characterized in that, The exhaust pipeline has an air inlet end and an air outlet end. The air inlet end is communicated with the gas outlet, and the air outlet end is connected with a gas detector.

3. The separation device for the mixed gas according to any one of claims 1-2, characterized in that, The number of types of gases to be separated in the mixed gas is 1 more than the number of the adsorption pipelines.

4. The separation device for the mixed gas according to any one of claims 1-2, characterized in that, The adsorption pipeline is a U-shaped pipe.

5. The separation device for the mixed gas according to any one of claims 1-2, characterized in that, It further includes a temperature detection mechanism and a control mechanism; A plurality of the temperature detection mechanisms are respectively connected with a plurality of the adsorption pipelines one by one and are used for detecting the temperature of the adsorption pipelines; The control mechanism is respectively connected with the temperature detection mechanism and the heating mechanism. The control mechanism is used for opening and closing the heating mechanism.

6. The separation device for the mixed gas according to any one of claims 1-2, characterized in that, It further includes a heat dissipation mechanism. The heat dissipation mechanism is used for cooling the adsorption pipeline.

7. A method for separating a mixed gas by using a separation device for the mixed gas according to any one of claims 1-6, characterized in that, It includes the following steps: Gas adsorption: The mixed gas is sequentially passed through a plurality of gas adsorption structures. Each of the gas adsorption structures respectively adsorbs one of the multiple gases in the mixed gas; Gas discharge: First, the mixed gas after being adsorbed and filtered is discharged, and then the adsorbed gas is discharged by heating.

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