A device for measuring trace organic gases

Abstract

The utility model provides a device for measuring trace organic gas belongs to detection technical field for solving artificial detection distillation end point subjectivity is strong, accuracy is low and part organic matter detection difficult technical problem. Including: the sampling pipe of connection in reaction device, sampling pipe rear end is connected with filter and detector in proper order, filter includes casing, filter core, air inlet, gas outlet and water outlet, air inlet connects sampling pipe, gas outlet connects detector, filter core is located in the casing, filter core filters water in sampling gas, and water is discharged through water outlet, and gas is discharged through gas outlet, detector is used for detecting organic ingredient in sampling gas. Have the technical effect of realizing real -time accurate measurement, reducing artificial error, improving detection security and stability.

Description

Technical Field

[0001] This utility model relates to the field of detection technology, specifically to a device for measuring trace amounts of organic gases. Background Technology

[0002] In the production process of CMC workshops, distillation is often used to separate organic matter from liquids, such as separating alcohol from water. In specific operations, the liquid is heated to the boiling point of the target organic matter, and the difference in boiling points is used to achieve vapor-liquid separation of the organic matter and water, ultimately completing the recovery of the organic matter.

[0003] On the one hand, this process results in the separation of organic gases containing a large amount of water vapor; on the other hand, currently, determining the distillation endpoint mainly relies on manual measurement, such as assessing the amount of residual organic matter through timed sampling and odor identification. However, manual detection has significant limitations: different operators have individual differences in odor sensitivity, and some organic substances have no significant odor characteristics or are not suitable for human contact, leading to highly subjective judgments, large fluctuations in accuracy, or difficulties in detection. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model proposes a device for measuring trace organic gases, which solves the technical problems of high subjectivity, low accuracy and difficulty in detecting some organic compounds in manual detection of distillation endpoint.

[0005] The technical solution adopted in this utility model is: a device for measuring trace amounts of organic gases, comprising: A sampling tube connected to the reaction device, wherein a filter and a detector are sequentially connected to the rear end of the sampling tube; The filter includes a housing, a filter element, an air inlet, an air outlet, and a water outlet. The air inlet is connected to the sampling tube, the air outlet is connected to the detector, the filter element is disposed inside the housing, the filter element filters water in the sampled gas, and discharges water through the water outlet and discharges gas through the air outlet. The detector is used to detect organic components in the sampled gas.

[0006] Optionally, a sampling pump is provided on the sampling tube between the reaction device and the filter.

[0007] Optionally, the outlet of the filter is provided with a water reservoir and a drain valve.

[0008] Optionally, the housing is tubular, and the inner cavity of the housing is divided into upper and lower cavities by a support plate. The air inlet is connected to the inside of the upper cavity. The filter element is also tubular, with its outer circumference closed. After the filter element is filled with filter filler, its lower end contacts the support plate, and its upper end is sealed and limited by a support ring inside the housing. The air outlet is then connected to the inside of the filter element.

[0009] Optionally, the filter element has a sealing end cap at its upper end, an outlet on its side, a passage at a corresponding position on the support ring, and an air outlet at a corresponding position on the housing.

[0010] Optionally, the sealing end cap of the filter element is provided with an operating post, and an abutment plate is provided on the operating post, with the mounting cover of the housing pressing down on the abutment plate.

[0011] Optionally, the outer periphery of the shell is covered by a water bath container, which has an inlet pipe and an outlet pipe.

[0012] Optionally, the area between the shell and the filter element in the corresponding range of the water bath container is provided with heat exchange fins.

[0013] Optionally, the filter core is a 3A molecular sieve, and / or the water bath container is kept at a temperature of 78℃-80℃.

[0014] Optionally, the filter has at least two stages connected in series.

[0015] As can be seen from the above technical solution, the beneficial technical effects of this utility model are as follows: By incorporating a sampling tube connected to the reaction device, a filter with water vapor separation function, and an organic component detector, real-time online detection of organic gases during the distillation process was achieved. This device effectively filters water vapor from the sampled gas, avoiding interference from water vapor on the detection results, while also eliminating subjective errors inherent in traditional manual judgment, thus improving detection accuracy and safety. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the overall layout.

[0018] Figure 2 This is a schematic diagram of a filter.

[0019] Reference numerals: Sampling tube 1, Filter 2, Housing 21, Support plate 211, Support ring 212, Mounting cover 213, Filter element 22, Sealing end cover 221, Operating column 222, Abutment plate 223, Air inlet 23, Air outlet 24, Water outlet 25, Water storage area 26, Drain valve 27, Water bath container 28, Heat exchange fins 29, Detector 3, Sampling pump 4. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0021] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0022] To facilitate understanding of this solution, the scenario is briefly described below: In the applicant's CMC workshop, alcohol is heated to its boiling point during production to achieve complete alcohol recovery. Currently, this is done manually using methods such as smelling. However, this method is too crude, leading to inconsistent alcohol content readings due to differences in personnel, and is not economical. Therefore, this solution is designed and developed based on existing infrared combustible gas detectors to achieve real-time alcohol content measurement.

[0023] Specifically, an apparatus for measuring trace amounts of organic gases; please refer to the appendix. Figure 1 One possible implementation includes: a sampling tube 1 connected to the reaction apparatus, with a filter 2 and a detector 3 connected sequentially to the rear end of the sampling tube 1. The reaction apparatus, such as a reaction vessel, is a reaction vessel for heating alcohol to its boiling point; this is not an improvement in this solution. This measuring device is adaptable to various reaction apparatuses. The filter 2 includes a housing 21, a filter element 22, an air inlet 23, an air outlet 24, and a water outlet 25. The air inlet 23 is connected to the sampling tube 1, and the air outlet 24 is connected to the detector 3. The filter element 22 is located inside the housing 21. The filter element 22 filters the water in the sampled gas and discharges the water through the water outlet 25. The gas is discharged through the air outlet 24 and enters the detector 3. The detector 3 is used to detect organic components in the sampled gas.

[0024] In the above embodiments, during the distillation process, the sampled gas exiting the reaction device (such as a reaction vessel) contains not only the target organic gas (e.g., alcohol vapor) but also a large amount of water vapor. If the sampled gas is not filtered beforehand and directly passed into detector 3 for detection, several problems will arise: water vapor may interfere with the detection element of detector 3, affecting its accurate detection of organic components, leading to data deviations and failing to accurately reflect the actual content of organic components in the sampled gas. Prolonged exposure to sampled gas containing a large amount of water vapor in detector 3 may cause water vapor to condense inside the detector, corroding its components, shortening its lifespan, and increasing maintenance costs and replacement frequency. The presence of water vapor may reduce the detection sensitivity of detector 3, making the detection of trace organic gases difficult and failing to meet the requirements for accurate measurement of trace organic gases. However, by filtering the water in the sampled gas through the filter element of filter 2 and discharging the water through outlet 25, allowing only the filtered gas to enter detector 3 through outlet 24, the above problems can be effectively avoided, improving the accuracy and reliability of the detection.

[0025] In the above embodiments, detector 3 is not a core improvement of this application; in actual operation, existing commercial detectors can be directly selected. Detector 3 is mainly based on the unique physical or chemical properties of different organic gases for detection. For example, some organic gases undergo specific electrochemical reactions on the electrode surface, generating a current signal proportional to the concentration of the organic gas. By measuring the magnitude of this current signal, the concentration of the organic gas can be determined. Another example is that different organic gas molecules have specific infrared absorption spectra. When infrared light passes through a sampling gas containing organic gas, the organic gas molecules absorb infrared light of specific wavelengths. By detecting the degree of infrared light absorption, the concentration of the organic gas can be calculated. In this embodiment, taking alcohol detection as an example, existing infrared combustible gas alarms and breathalyzers can be disassembled and modified, and then installed in a filtered pipeline for detection.

[0026] The core advantages of the above embodiments are: replacing the existing method of determining the distillation endpoint by manual smelling, thus eliminating the interference of subjective factors on the detection results. By separating water vapor and organic gases through a filter, water vapor is prevented from interfering with detector readings. Simultaneously, detectors based on electrochemical / infrared / catalytic combustion principles enable accurate quantitative analysis of various organic gases (including odorless or toxic gases). This technical solution not only reduces the detection error rate but also enables automated real-time monitoring, significantly improving production safety and process stability.

[0027] In one possible implementation, a sampling pump 4 is installed on the sampling pipe 1 between the reaction device and the filter 2. The outlet 25 of the filter 2 is equipped with a water reservoir and a drain valve 27. This implementation achieves three core benefits by adding a sampling pump and filter to the sampling tube: First, the sampling pump actively draws in the sampling gas to form a stable airflow, which not only provides continuous gas pressure for subsequent filtration, ensuring that the gas penetrates the filter element at a constant flow rate, greatly improving filtration efficiency and integrity, but also avoids gas retention or detection delays caused by insufficient gas pressure. Second, the coordinated operation of the water buffer and drain valve establishes a water vapor management mechanism. When water vapor liquefies and accumulates at the front end of the filter, the water buffer can temporarily store a certain amount of liquid water. Combined with the timed automatic drainage function, this effectively prevents the filter element from failing due to long-term immersion, continuously maintaining the filter element in a dry state and at its optimal filtration performance. Third, through the optimization of gas pressure drive and water vapor separation, this system reduces the error rate caused by water vapor interference in traditional manual detection, while shortening the detection response time and improving the real-time performance and accuracy of the distillation process control.

[0028] In one possible implementation, see Appendix Figure 2 The housing 21 is tubular, and the inner cavity of the housing 21 is divided into upper and lower cavities by the support plate 211. The support plate 211 has holes or other through areas to ensure that water vapor can pass through freely. The air inlet 23 is connected to the inside of the upper cavity. The filter element 22 is also tubular. The outer circumference of the filter element 22 is closed (so that water vapor cannot pass through). After the filter element is filled inside, the lower end contacts the support plate 211. The upper end is sealed and limited by the support ring 212 inside the housing 21, so that water vapor cannot pass through the gap between the support ring 212 and the filter element 22. The air outlet 24 is connected inside the filter element 22.

[0029] In the above embodiment, the water vapor passes through the following path: it enters from the air inlet 23, moves down through the gap between the housing 21 and the filter element 22 and passes through the support plate 211, then enters the interior of the filter element 22 and exits from the air outlet 24. During this process, when the water vapor enters from the air inlet 23, it is mixed with water vapor and organic gases (such as alcohol). When passing through the filter element 22, the organic gases pass smoothly and exit from the air outlet 24, while the water vapor is trapped by the filter element 22. As the water vapor concentration inside the housing 21 increases, the water gradually liquefies and accumulates, and is subsequently discharged periodically through the water outlet 25.

[0030] In one possible implementation, see Appendix Figure 2The filter element 22 has a sealing end cap 221 at its upper end and an outlet on its side. A passage port is located at a corresponding position on the support ring 212, and an air outlet 24 is located at a corresponding position on the housing 21. An operating post 222 is provided on the sealing end cap 221 of the filter element 22, and an abutment plate 223 is provided on the operating post 222. The mounting cover 213 of the housing 21 presses against the abutment plate 223, and the mounting cover 213 can be connected to the housing 21 by screws. In the above embodiment, the integrated design of the sealing end cap and the operating post transforms the filter element replacement operation from the traditional complex disassembly and assembly to a single "pull-out" action, shortening maintenance time. The pressing structure of the abutment plate and the mounting cover provides double protection, ensuring zero leakage in the air circuit system and preventing filter element displacement through mechanical limiting. The precise alignment design of the support ring passage port and the housing air outlet, combined with the detachable mounting cover, allows the filter element replacement process without disassembling the entire filter, ensuring convenient maintenance during continuous production.

[0031] In one possible implementation, see Appendix Figure 2 The outer periphery of the shell 21 is covered by a water bath container 28, which has an inlet pipe and an outlet pipe. Within the corresponding area of ​​the water bath container 28, the region between the shell 21 and the filter element 22 is provided with heat exchange fins 29. These fins 29 can be tilted to facilitate the falling of water droplets into the water storage area 26. Furthermore, the filter media is a 3A molecular sieve (filled in granular form within the filter element 22), and / or the water bath container 28 has a heat preservation temperature of 78℃-80℃.

[0032] In the above embodiments, 3A molecular sieve is a synthetically produced inorganic crystalline material with a pore size of 3 Å (angstroms, a unit of length, 1 Å = 0.1 nanometers). The pore size of the 3Å molecular sieve only allows water molecules (kinetic diameter approximately 2.6 Å) to pass through, while ethanol molecules (kinetic diameter approximately 4.5 Å) are blocked. It has a uniform microporous structure, with pore sizes similar to the diameter of water molecules, enabling selective adsorption based on molecule size and polarity. It primarily adsorbs water molecules, while adsorbing little or no other larger molecules, thus it is often used as a desiccant. 3A molecular sieves are typically prepared using aluminosilicates as the basic framework through specific synthetic processes. The main components include silicon dioxide (SiO2) and aluminum oxide (Al2O3), and may also contain some alkali metal oxides, such as sodium oxide (Na2O). Its chemical composition can generally be expressed as Na2O·Al2O3·2SiO2·4.5H2O or similar forms (the chemical composition of 3A molecular sieves may vary depending on the preparation method and application).

[0033] The reason for setting up the water bath container 28 in the above embodiment is that during the distillation process, the sampling gas coming out of the reaction device contains a large amount of water vapor. The high humidity of the sampling gas will put a large load on the filter, affecting the filtration effect and the filter's service life. The water bath container 28 covers the shell 21, and when the sampling gas flows through the area between the shell 21 and the filter element 22, the water in the water bath container 28 can exchange heat with the sampling gas. By controlling the temperature of the water in the water bath container 28, the water vapor in the sampling gas undergoes a phase change upon cooling, transforming from a gaseous state to liquid water droplets, thereby reducing the humidity of the sampling gas, reducing the load on the filter, improving filtration efficiency, and ensuring that the subsequent detector can more accurately detect organic components. The reason for setting the insulation temperature of the water bath container 28 to 78℃-80℃ is that the boiling point of alcohol is generally around 78℃ (the boiling point varies slightly depending on the purity of the alcohol). This temperature range of 78℃-80℃ exceeds the boiling point of alcohol, ensuring that the alcohol in the incoming sampling gas exists in a gaseous form and will not re-liquefy in the water bath container 28 due to temperature reduction. Simultaneously, when the water vapor temperature in the incoming sampling gas is 90-100℃, a temperature difference of more than 10 degrees Celsius is formed with the water bath temperature of 78℃-80℃. Under high humidity conditions, this temperature difference can cause the water vapor in the sampling gas to cool rapidly and convert into water droplets. After the water droplets form, due to the inclined arrangement of the heat exchange fins 29, the water droplets are more likely to fall into the water storage area 26, thereby effectively reducing the humidity of the sampling gas, reducing the load on the filter 2, and enabling the filter 2 to filter the remaining water vapor and other impurities more efficiently, ensuring the stable operation and accurate measurement of the entire measuring device. If the temperature setting is too low, the alcohol may also liquefy, affecting the measurement results; if the temperature setting is too high, the humidity of the sampling gas cannot be effectively reduced, and the purpose of reducing the filter load cannot be achieved. In the above embodiment, when the target organic gas is not alcohol, it may be necessary to change the material of the filter core and the insulation temperature of the water bath container 28 accordingly.

[0034] Furthermore, filter 2 is configured with at least two stages in series to further separate water vapor, dry organic gases (alcohol), and improve detection sensitivity.

[0035] In addition, the entire device can be encapsulated in a housing, which has an air inlet / outlet and a drain outlet.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A device for measuring trace amounts of organic gases, characterized in that, include: A sampling tube (1) is connected to the reaction device, and a filter (2) and a detector (3) are connected in sequence at the rear end of the sampling tube (1); The filter (2) includes a housing (21), a filter element (22), an air inlet (23), an air outlet (24), and a water outlet (25). The air inlet (23) is connected to the sampling tube (1), and the air outlet (24) is connected to the detector (3). The filter element (22) is disposed inside the housing (21). The filter element (22) filters water in the sampled gas and discharges water through the water outlet (25) and discharges gas through the air outlet (24). The detector (3) is used to detect organic components in the sampled gas.

2. The device for measuring trace amounts of organic gases as described in claim 1, characterized in that: A sampling pump (4) is installed on the sampling tube (1) between the reaction device and the filter (2).

3. The device for measuring trace amounts of organic gases as described in claim 1, characterized in that: The filter (2) is equipped with a water reservoir and a drain valve (27) at its outlet (25).

4. The device for measuring trace amounts of organic gases as described in claim 1, characterized in that: The housing (21) is tubular, and the inner cavity of the housing (21) is divided into upper and lower cavities by the support plate (211). The air inlet (23) is connected to the inside of the upper cavity. The filter element (22) is also tubular. The outer circumference of the filter element (22) is closed. After the filter element is filled with filter filler, the lower end contacts the support plate (211). The upper end is sealed and limited by the support ring (212) inside the housing (21). The air outlet (24) is connected inside the filter element (22).

5. The device for measuring trace amounts of organic gases as described in claim 4, characterized in that: The filter element (22) has a sealing end cap (221) at its upper end and an outlet on its side. The support ring (212) has a passage at a corresponding position, and the housing (21) has an air outlet (24) at a corresponding position.

6. The apparatus for measuring trace amounts of organic gases as described in claim 5, characterized in that: An operating post (222) is provided on the sealing end cap (221) of the filter element (22), and an abutment plate (223) is provided on the operating post (222). The mounting cover (213) of the housing (21) presses against the abutment plate (223).

7. The apparatus for measuring trace amounts of organic gases as described in claim 4, characterized in that: The outer periphery of the shell (21) is covered by a water bath container (28), which has an inlet pipe and an outlet pipe.

8. The apparatus for measuring trace amounts of organic gases as described in claim 7, characterized in that: The area corresponding to the water bath container (28) is provided with heat exchange fins (29) in the region between the shell (21) and the filter element (22).

9. The apparatus for measuring trace amounts of organic gases as described in claim 7, characterized in that: The filter core is a 3A molecular sieve, and / or the water bath container (28) has a heat preservation temperature of 78℃-80℃.

10. The apparatus for measuring trace amounts of organic gases as described in claim 1, characterized in that: The filter (2) has at least two stages connected in series.

Images