Device for detecting concentration of multi-component trace gas

Abstract

The utility model discloses a device for detecting the concentration of multi-component trace gas, and particularly relates to the technical field of gas detection equipment, the device comprises a gas chromatograph main body, one side of the outer surface wall of the gas chromatograph main body is connected with a gas inlet pipe, the lower end of the gas inlet pipe is fixedly connected with a fixed seat on the outer surface wall of the gas chromatograph main body, and the fixed seat is fixedly connected with the gas chromatograph main body. A treatment cylinder is connected to the interior of the fixed seat, a partition plate is connected to the interior of the treatment cylinder, and a concentration structure is arranged on one side of the partition plate. By arranging the concentration structure, low-concentration trace gas can be concentrated and enriched, extremely-low-concentration gas which is originally difficult to detect is gathered in quantity, the concentration of the trace gas in a gas sample is greatly improved, and a detection signal becomes easy to capture and analyze from weak, so that the detection sensitivity is greatly enhanced; trace gas components which are possibly omitted in the past can be accurately found, and the reliability and the accuracy of a detection result are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detection equipment technical field, concretely relates to a device for detecting multi-component trace gas concentration. BACKGROUND

[0002] Trace gas detection is applied more and more widely in industry, environment, medical treatment and petroleum, chemical industry, metallurgy and many other fields, especially in dangerous places where flammable, explosive and toxic gases exist. In recent years, atmospheric environmental problems are highlighted, and global climate warming causes the concentration of greenhouse gases in the atmosphere to continue to rise. In the field of environmental detection, it is of great significance to accurately quantify the detection of trace gases in the atmosphere. Trace gas detection mainly uses methods such as mass spectrometry, electronic nose and spectroscopy detection. Gas chromatograph is also one of the commonly used detection equipment.

[0003] In the application number 202220954461.2, a gas chromatograph with a gas filtering structure is disclosed. The upper end of the retaining ring is fixedly connected with a filtering device for filtering the sample. The filtering device includes a first cover plate for closing the upper end of the fixed shell. The upper end of the first cover plate is fixedly connected with the lower end of the vertical part of the gas outlet pipe, and the inner cavity of the gas outlet pipe is communicated with the inner cavity of the first cover plate. The gas in the inner cavity of the fixed shell can enter the main body of the gas chromatograph through the gas outlet pipe for analysis. The inner surface of the first cover plate is threadedly connected with a fixed shell for installing and fixing the separation device and the air pump. The lower end of the fixed shell is provided with a fixed hole which is communicated with the inner cavity of the fixed shell for fixing the air pump. The inner surface of the fixed hole is fixedly connected with the air pump at the lower part. The sample is sucked into the inner cavity of the separation shell. The inner surface of the fixed hole is threadedly connected with the separation device at the upper part. In the above, the dust doped in the detection sample is filtered by the filtering device, thereby improving the detection accuracy. However, in the actual detection scene, it is difficult to concentrate and enrich the extremely low concentration target gas when detecting the low concentration trace gas in the environment or industry. Only dust removal cannot strengthen the weak signal, so that the trace gas cannot be accurately quantitatively analyzed due to weak signal after entering the instrument. Secondly, when facing complex samples with multiple components and large differences in component concentration, such as mixed waste gas in a chemical plant, it is difficult to concentrate on different concentration gases. High concentration gas can easily shield the low concentration trace gas signal, interfere with the determination of each component concentration, and the instrument cannot sensitively capture the weak signal without concentration and concentration of heavy metal vapor and other trace gases. It is difficult to determine its existence and concentration, and it is also difficult to extract a small amount of gas components, so that the gas sample entering the analysis cannot fully represent the original sample, and it is difficult to fully and accurately reflect the true situation, which finally affects the reliability and accuracy of the detection result. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a device for detecting multi-component trace gas concentration to solve the above-mentioned deficiencies in the art.

[0005] In order to achieve the above object, the utility model provides the following technical scheme: a device for detecting the concentration of multi-component trace gas, which comprises a gas chromatograph main body, the outer wall of the gas chromatograph main body is connected with an air inlet pipe, the lower end of the air inlet pipe is fixedly connected with a fixing seat on the outer wall of the gas chromatograph main body, the inside of the fixing seat is connected with a processing cylinder, and the inside of the processing cylinder is connected with a partition plate.

[0006] Preferably, one side of the partition plate is provided with a concentration structure, the concentration structure comprises a glass microtube arranged in the processing cylinder, the inside of the glass microtube is provided with an adsorption block, the outside of the glass microtube is provided with a plurality of heating wires and a plurality of refrigeration fins, heat-conducting silicone grease is arranged between the refrigeration fins, the heat-conducting silicone grease can fill the tiny gap between the refrigeration fins and the glass microtube, the heat-conducting efficiency is further improved, and the cold energy generated by the refrigeration fins can be effectively transmitted to the inside of the glass microtube for refrigeration in the adsorption process.

[0007] Preferably, the plurality of heating wires are wound on the outer wall of the glass microtube, and the plurality of heating wires and the plurality of refrigeration fins are arranged at intervals.

[0008] Preferably, the concentration structure further comprises a first connecting end and a second connecting end connected to the end of the glass microtube respectively, a micro electromagnetic valve is arranged on the first connecting end and the second connecting end, and the end of the air inlet pipe away from the gas chromatograph main body penetrates into the inside of the processing cylinder and is connected with the first connecting end.

[0009] Through the above technical scheme:

[0010] Before detection, the micro electromagnetic valve on the second connecting end is opened, the gas sample enters the glass microtube, at this time, the refrigeration fins work, the temperature of the glass microtube is reduced, the trace gas in the gas sample is adsorbed by the adsorption block, after a certain time of adsorption, the micro electromagnetic valve on the second connecting end is closed, then the heating wires are rapidly heated, and at the same time, the micro electromagnetic valve on the first connecting end is opened, the gas passes through the microtube at a certain flow rate, and the desorbed trace gas is brought into the air inlet pipe, in the above operation, the target trace gas is efficiently adsorbed and enriched by using a specific adsorption material and a low-temperature environment, so that the extremely weak signal is enhanced, thereby the device can more accurately capture and identify, the sensitivity and accuracy of detection are greatly improved, in addition, different gases can be separated and enriched according to their characteristics, the interference and shielding of high-concentration gas on the signal of low-concentration trace gas are avoided, and the concentration of each component can be accurately measured.

[0011] Preferably, the other side of the partition plate and the inside of the processing cylinder are connected with a partition plate, and the upper end of the partition plate is provided with a stainless steel sintered filter cartridge.

[0012] Preferably, the upper end surface of the stainless steel sintering filter cartridge is connected with a connecting disc, the connecting disc is arranged in the embedding groove arranged on the upper end surface of the treatment cylinder, and the upper end surface of the connecting disc is connected with a connecting pipe; by rotating the connecting disc clockwise, the protrusions on the outer surface wall of the connecting disc are turned to the opening on the upper end surface of the treatment cylinder, and finally the connecting disc is pulled upward to take out the stainless steel sintering filter cartridge for cleaning, so that subsequent filtering treatment can be carried out; after cleaning, the connecting disc can be installed back to the original position by reversing the above operation.

[0013] Preferably, the upper end surface of the stainless steel sintering filter cartridge is connected with a connecting disc, the connecting disc is arranged in the embedding groove arranged on the upper end surface of the treatment cylinder, and the upper end surface of the connecting disc is connected with a connecting pipe; by rotating the connecting disc clockwise, the protrusions on the outer surface wall of the connecting disc are turned to the opening on the upper end surface of the treatment cylinder, and finally the connecting disc is pulled upward to take out the stainless steel sintering filter cartridge for cleaning, so that subsequent filtering treatment can be carried out; after cleaning, the connecting disc can be installed back to the original position by reversing the above operation.

[0014] Preferably, the upper end surface of the stainless steel sintering filter cartridge is connected with a connecting disc, the connecting disc is arranged in the embedding groove arranged on the upper end surface of the treatment cylinder, and the upper end surface of the connecting disc is connected with a connecting pipe; by rotating the connecting disc clockwise, the protrusions on the outer surface wall of the connecting disc are turned to the opening on the upper end surface of the treatment cylinder, and finally the connecting disc is pulled upward to take out the stainless steel sintering filter cartridge for cleaning, so that subsequent filtering treatment can be carried out; after cleaning, the connecting disc can be installed back to the original position by reversing the above operation.

[0015] Through the above technical scheme:

[0016] Before concentration, the gas sample enters the stainless steel sintering filter cartridge through the connecting pipe to remove large-particle impurities in the gas sample, and then enters the glass column containing chemical adsorbents (such as silica gel to remove moisture and active alumina to remove acidic gas) through the communication pipe to remove specific chemical substances in the gas sample that may interfere with detection; the silica gel removes moisture to avoid chemical reaction between moisture and target gas during concentration or detection, ensuring that the detection result truly reflects the concentration and characteristics of the target gas; the active alumina removes acidic gas to prevent the acidic gas from corroding equipment components, reducing the service life of the equipment, and also avoiding reaction with other gas components to generate new compounds, interfering with accurate detection and analysis of trace gases, so that the gas sample entering the concentration link is more pure and reliable.

[0017] In the above technical scheme, the technical effects and advantages of the utility model are provided:

[0018] 1. By arranging the concentration structure, low-concentration trace gases can be concentrated and enriched, a large amount of extremely low-concentration gases that are originally difficult to detect can be gathered, the concentration of trace gases in the gas sample is greatly improved, the detection signal becomes easy to capture and analyze from weak, the sensitivity of detection is greatly enhanced, trace gas components that may have been missed in the past can be accurately found, the reliability and accuracy of the detection result are improved, secondly, the concentration and enrichment function can also enable the device to detect complex gas samples with multiple components or large differences in the concentration of each component, separate and enrich the components according to their characteristics, avoid the interference and shielding of high-concentration gases on the signal of low-concentration trace gases, and ensure that the concentration of each component can be accurately determined, thereby improving the adaptability and accuracy of detection.

[0019] 2、By setting the filtering structure, before the concentration treatment, the large particle impurities in the gas sample and the specific chemical substances that may interfere with the detection can be removed, not only ensuring that the internal pipeline and components of the subsequent device are free from particle wear and blockage, maintaining the smoothness of the gas transmission path, but also making the gas sample entering the concentration link more pure and reliable, greatly improving the accuracy and effectiveness of the trace gas treatment in the concentration process, so that the trace gas can be more accurately enriched and detected in the adsorption, desorption and other operations, reducing errors and interference, and ensuring the accuracy and reliability of the detection results. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0022] Figure 2 It is a sectional view of the processing cylinder of the present application.

[0023] Figure 3 It is a sectional view of the processing cylinder of the present application.

[0024] Figure 4 It is a sectional view of the glass microtube of the present application.

[0025] Figure 5 It is an enlarged schematic view of the concentration structure of the present application.

[0026] Figure 6 It is a schematic view of the stainless steel sintered filter cartridge taken out of the processing cylinder of the present application.

[0027] Explanation of reference signs:

[0028] 1, gas chromatograph main body; 2, gas inlet pipe; 3, fixed seat; 4, processing cylinder; 5, spacer plate; 6, concentration structure; 61, glass microtube; 62, adsorption block; 63, heating wire; 64, heat-conducting silicone grease; 65, refrigeration sheet; 66, first connecting end; 67, second connecting end; 68, micro electromagnetic valve; 7, partition plate; 8, stainless steel sintered filter cartridge; 9, connecting disc; 10, connecting pipe; 11, communication pipe; 12, glass column; 13, conveying pipe. DETAILED DESCRIPTION

[0029] In order to make the technical scheme of the utility model better understood by the skilled in the art, the utility model will be further described in detail below in combination with the drawings.

[0030] The utility model provides a kind of device for detecting concentration of multi-component trace gas as Figure 1 As shown in a kind of device for detecting concentration of multi-component trace gas, comprising:

[0031] Gas chromatograph main body 1, the outer wall of gas chromatograph main body 1 side is connected with inlet pipe 2, the lower end of inlet pipe 2 and the outer wall of gas chromatograph main body 1 are fixedly connected with fixed seat 3, the inside of fixed seat 3 is connected with processing cylinder 4, the inside of processing cylinder 4 is connected with spacing plate 5.

[0032] The utility model provides a kind of device for detecting concentration of multi-component trace gas as Figure 2 、 Figure 4 And Figure 5 The side of spacing plate 5 is equipped with concentration structure 6, and concentration structure 6 includes glass microtube 61 arranged in the inside of processing cylinder 4, the inside of glass microtube 61 is equipped with adsorption block 62, adsorption block 62 is porous adsorption material (such as molecular sieve or activated carbon fiber), and the outside of glass microtube 61 is equipped with a plurality of heating wires 63 and a plurality of refrigerating fins 65, and heat-conducting silicone grease 64 is arranged between refrigerating fins 65, heat-conducting silicone grease 64 can fill the small gap between refrigerating fin 65 and glass microtube 61, further improve the heat conduction efficiency, ensure that the cold energy generated by refrigerating fin 65 can be effectively transmitted to the inside of glass microtube 61, for refrigeration in adsorption process.

[0033] A plurality of heating wires 63 are wound on the outer wall of glass microtube 61, and a plurality of heating wires 63 and a plurality of refrigerating fins 65 are spaced apart from each other.

[0034] Concentration structure 6 further includes first connecting end 66 and second connecting end 67 connected to the end of glass microtube 61 respectively, and micro electromagnetic valve 68 is arranged on first connecting end 66 and second connecting end 67, one end of inlet pipe 2 away from gas chromatograph main body 1 is connected with first connecting end 66 by penetrating and extending to the inside of processing cylinder 4.

[0035] Through the above technical scheme:

[0036] Before detection, open the micro electromagnetic valve 68 on the second connecting end 67, the gas sample enters the glass micro tube 61, at this time the refrigeration piece 65 works, the temperature of the glass micro tube 61 is reduced, and trace gas in the gas sample is adsorbed by the adsorption block 62, after a certain time of adsorption, the micro electromagnetic valve 68 on the second connecting end 67 is closed, then the heating wire 63 is rapidly heated, and the micro electromagnetic valve 68 on the first connecting end 66 is opened, the gas passes through the micro tube at a certain flow rate, and the desorbed trace gas is taken into the gas inlet pipe 2.In the above operation, the target trace gas is efficiently adsorbed and enriched by using a specific adsorption material and a low-temperature environment, so that the extremely weak signal is enhanced, thereby the device can capture and identify more accurately, and the detection sensitivity and accuracy are greatly improved.

[0037] The utility model provides a kind of device for detecting multi-component trace gas concentration as Figure 3 And Figure 6 As shown in a kind of device for detecting multi-component trace gas concentration, the other side of spacer plate 5 and located inside processing cylinder 4 is connected with partition plate 7, and the upper end of partition plate 7 is provided with stainless steel sintered filter cartridge 8.

[0038] The upper end surface of stainless steel sintered filter cartridge 8 is connected with connecting disc 9, and connecting disc 9 is arranged in the embedded groove opened on the upper end surface of processing cylinder 4, and the upper end surface of connecting disc 9 is connected with connecting pipe 10.

[0039] The upper end of partition plate 7 is connected with communicating pipe 11, and the lower end surface of communicating pipe 11 is connected with glass column 12 filled with chemical adsorbent.

[0040] The end of glass column 12 away from communicating pipe 11 is connected with conveying pipe 13, and the outlet of conveying pipe 13 is connected with second connecting end 67.

[0041] Through the above technical solution:

[0042] Before the concentration, the gas sample firstly enters into the stainless steel sintered filter cartridge 8 through the connecting pipe 10 to remove the large particle impurities in the gas sample, and then enters into the glass column 12 filled with chemical adsorbent (such as silica gel to remove moisture, activated alumina to remove acidic gas, etc.) through the connecting pipe 11 to remove specific chemical substances in the gas sample that may interfere with the detection, the silica gel to remove moisture can avoid the moisture from reacting with the target gas in the concentration or detection process, ensuring that the detection result truly reflects the concentration and characteristics of the target gas, the activated alumina to remove acidic gas can prevent the acidic gas from corroding the equipment components, reducing the service life of the equipment, and also avoiding the reaction with other gas components to generate new compounds, interfering with the accurate detection and analysis of trace gas, so that the gas sample entering the concentration link is more pure and reliable.

[0043] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the present application for those skilled in the art. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. An apparatus for detecting concentrations of multi-component trace gases, comprising: Include: Gas chromatograph body (1), the outer wall side of the gas chromatograph body (1) is connected with the air inlet pipe (2), the lower end of the air inlet pipe (2) and the outer wall of the gas chromatograph body (1) are fixedly connected with the fixed seat (3), the inside of the fixed seat (3) is connected with the processing cylinder (4), the inside of the processing cylinder (4) is connected with the spacing plate (5), one side of the spacing plate (5) is provided with the concentration structure (6); The concentration structure (6) includes glass microtubule (61) arranged in the processing cylinder (4), the inside of the glass microtubule (61) is provided with adsorption block (62), and the outside of the glass microtubule (61) is provided with a plurality of heating wires (63) and a plurality of refrigeration pieces (65), the heat-conducting silicone grease (64) is arranged between the refrigeration pieces (65).

2. The apparatus for detecting concentration of multi-component trace gas according to claim 1, characterized in that: A plurality of the heating wires (63) are wound on the outer wall of the glass microtubule (61), and the plurality of heating wires (63) and the plurality of refrigeration pieces (65) are arranged at intervals.

3. The apparatus of claim 1, wherein: The concentration structure (6) further includes a first connecting end (66) and a second connecting end (67) connected to the end of the glass microtubule (61) respectively, the micro electromagnetic valve (68) is arranged on the first connecting end (66) and the second connecting end (67), the end of the air inlet pipe (2) away from the gas chromatograph body (1) penetrates and extends to the inside of the processing cylinder (4) and is connected with the first connecting end (66).

4. The apparatus of claim 1, wherein: The other side of the spacing plate (5) and the inside of the processing cylinder (4) are connected with the partition plate (7), the upper end of the partition plate (7) is provided with the stainless steel sintered filter cartridge (8).

5. The apparatus of claim 4, wherein: The upper end surface of the stainless steel sintered filter cartridge (8) is connected with the connecting disc (9), the connecting disc (9) is arranged in the embedding groove on the upper end surface of the processing cylinder (4), and the upper end surface of the connecting disc (9) is connected with the connecting pipe (10).

6. The apparatus of claim 5, wherein: The partition plate (7) is connected with the communication pipe (11), and the lower end surface of the communication pipe (11) is connected with the glass column (12) filled with chemical adsorbent.

7. The apparatus of claim 6, wherein: The glass column (12) is connected with the conveying pipe (13) away from the communication pipe (11), and the outlet of the conveying pipe (13) is connected with the second connecting end (67).

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