Gas sampling device for chemical safety and method thereof

Abstract

The present application relates to the technical field of chemical safety, and particularly relates to a gas sampling device for chemical safety and a method thereof, which comprises the following steps: S1, before sampling, detecting working condition parameters in a sampling cylinder through a sensor group, and performing adaptive pretreatment according to the detection result; S2, switching an isolation mechanism to physically isolate a sampling cavity from a cleaning cavity, and sampling gas; S3, after sampling is completed, automatically selecting one or more of a negative pressure suction mode, an electrostatic elimination auxiliary mode, a wet dust suppression mode and an inert gas purging mode according to the detected working condition parameters, and driving a cleaning mechanism to scrape the inner wall of the sampling cylinder and synchronously collect the scraped matters; and S4, synchronously driving a cleaning assembly to clean a filter screen while the cleaning mechanism is running, and the like, through multi-mode cooperation of "negative pressure suction + airflow barrier + wet dust suppression", the scraped dust is collected immediately after being generated, pollution of dust flying to sampling gas and a subsequent pipeline is avoided, and detection accuracy is significantly improved.

Description

Technical Field

[0001] This invention relates to the technical field of chemical safety, and in particular to a gas sampling device and method for chemical safety. Background Technology

[0002] The chemical industry comprises enterprises and units engaged in the production and development of chemical products. Chemical products can generate large amounts of toxic substances during processing, storage, use, and waste disposal, which can impact the ecological environment and human health. Therefore, it is necessary to use sampling devices to collect samples of the surrounding air and then test them to prevent excessive toxic gases from endangering the lives of workers.

[0003] However, existing chemical gas sampling methods suffer from the following main problems: Dust adhering to the inner wall of the sampling cylinder is difficult to remove completely, and dust splashing during the scraping process causes secondary pollution, affecting detection accuracy and subsequent sampling. High-humidity gases condense on the cylinder wall, causing dust to form slurry that clogs the pipeline; simultaneously, water vapor dissolves acidic / alkaline gases, leading to detection distortion. Dust friction generates static electricity, exacerbating adsorption, and reactive gases form a molecular layer residue on the cylinder wall, producing a "memory effect." Flammable and explosive dust may trigger an explosion during scraping friction, and the dynamic sealing structure poses a leakage risk. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above-mentioned gas sampling devices and methods for chemical safety, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a gas sampling device and method for chemical safety, which aims to improve sampling accuracy, collection efficiency, and safety and environmental protection levels.

[0007] To solve the above technical problems, the present invention provides the following technical solution: S1. Before sampling, the working parameters inside the sampling tube are detected by a sensor group, and adaptive preprocessing is performed based on the detection results; S2. Switch the isolation mechanism to physically isolate the sampling chamber from the clean chamber for gas sampling; S3. After sampling is completed, based on the detected working parameters, one or more of the following modes are automatically selected: negative pressure suction mode, electrostatic elimination auxiliary mode, wet dust suppression mode, and inert gas purging mode. The cleaning mechanism is driven to scrape the inner wall of the sampling tube and collect the scraped material simultaneously. S4. When the cleaning mechanism is running, the cleaning components are driven synchronously to clean the filter screen. S5. Perform passivation treatment and thermal drying, and perform molecular-level anti-adsorption treatment and drying sterilization on the inner wall of the sampling tube; S6. Reset all moving parts and keep the isolation mechanism closed.

[0008] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the adaptive preprocessing includes activating the heating unit to preheat the inner wall of the sampling cylinder when the relative humidity is detected to be ≥ a set threshold, so that the cylinder wall temperature is higher than the gas dew point temperature. When an electrostatic potential ≥ a set threshold is detected, the electrostatic eliminator is activated to neutralize the electrostatic charge.

[0009] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the negative pressure suction mode specifically involves activating the negative pressure pump inside the hollow scraper to generate local negative pressure in the dust suction holes on the scraper; while the scraper removes dust, the dust is directionally sucked in by the dust suction holes and transported to the external dust collection container through the negative pressure flow channel.

[0010] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the wet dust suppression mode specifically involves spraying dust suppression liquid onto the cylinder wall through a micro-atomizing nozzle on the scraper before or during the scraper's movement to form a liquid film; the scraped dust mixes into the liquid film to form moist agglomerates, which slide down the cylinder wall to the dust collection tank.

[0011] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the inert gas purging mode specifically involves: while the scraper is moving, inert gas is introduced through an annular air curtain nozzle to form a downward airflow barrier; the inert gas replaces the residual gas in the cylinder, reducing the oxygen concentration.

[0012] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the passivation treatment specifically involves: when an active gas is detected in the sample gas, a passivating agent is sprayed onto the cylinder wall through a nozzle after cleaning to form a molecular-level anti-adsorption layer.

[0013] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the thermal drying specifically involves: starting the heating unit to raise the temperature inside the cylinder to 60-80°C, and simultaneously introducing a drying inert gas to purge, thereby achieving drying and sterilization.

[0014] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the device comprises: a sampling collection port; a sampling cylinder disposed on one side of the sampling collection port; a heating tube disposed inside the sampling cylinder; a filter plate disposed inside the sampling collection port; a first cylinder disposed at the top of the sampling collection port; a cleaning plate connected to the output end of the first cylinder; a second cylinder disposed at the top of the sampling collection port; and a sealing plate disposed at the output end of the second cylinder.

[0015] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, the sampling cylinder is provided with a drive motor at the top, a rotating shaft at the bottom of the drive motor, an opening communicating with its inner cavity on the outer side of the rotating shaft, a connecting rod connected to the outer side of the rotating shaft, a scraper connected to the outer side of the connecting rod, a plurality of gas ports on one side of the scraper, and a plurality of nozzles on the other side of the scraper.

[0016] As a preferred embodiment of the chemical safety gas sampling device and method of the present invention, wherein: an annular gas outlet pipe is provided at the upper part of the sampling cylinder, a suction pipe is connected to the bottom of the rotating shaft, an annular transfer component is connected to the top of the rotating shaft, and the annular transfer component is connected to the liquid inlet pipe.

[0017] The beneficial effects of this invention are as follows: By employing a multi-mode synergy of "negative pressure suction + airflow barrier + wet dust suppression," scraped dust is collected instantly upon generation, preventing dust contamination of the sampling gas and subsequent pipelines, and significantly improving detection accuracy. Real-time monitoring of humidity, static electricity, and dust concentration via a sensor array automatically selects corresponding modes such as preheating, static electricity removal, and wet dust suppression, solving problems difficult to address with traditional methods, such as high humidity condensation, electrostatic adsorption, and easily polymerizable gas residues. An isolated chamber design physically isolates the cleaning operation from the sampling gas path; inert gas purging and static electricity elimination are introduced for flammable and explosive dust, eliminating explosion hazards; the entire process operates in a closed loop, preventing leakage of toxic and harmful substances. Passivation spraying and thermal drying processes prevent the adsorption of reactive gases at the molecular level, while also avoiding microbial growth and metal corrosion, ensuring the stability and repeatability of long-term sampling. The cleaning mechanism and filter cleaning are synchronized, completing cylinder wall cleaning and filter regeneration in one operation, significantly shortening the sampling interval and adapting to high-frequency online monitoring requirements. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a partial internal cross-sectional view provided for the present invention.

[0020] Figure 3 This is a schematic diagram from another perspective provided for the present invention.

[0021] Figure 4 Provided by the present invention Figure 3 Enlarged diagram of point A in the middle.

[0022] Figure 5 Provided by the present invention Figure 3 Enlarged diagram of point B in the middle.

[0023] Figure 6 This is a schematic diagram of the heating element provided by the present invention.

[0024] Figure 7 This is a schematic diagram of the inlet pipe provided by the present invention.

[0025] Figure 8 This is a schematic diagram showing the cooperation between the rotating shaft and the annular rotating component provided by the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Reference Figures 1-8 This invention provides a chemical safety and environmentally friendly gas sampling method. Through multi-stage intelligent control, it achieves self-cleaning, dust suppression, dehumidification and safety protection of the sampling tube, significantly improving sampling accuracy, collection efficiency and safety and environmental protection level.

[0028] Includes the following steps: S1. Pre-sampling preparation and adaptive adjustment of operating conditions S1.1 Operating Condition Monitoring: The sensor array installed inside the sampling tube collects real-time data on the current environment and the temperature T, relative humidity RH, dust concentration C, and electrostatic potential V inside the sampling tube.

[0029] S1.2 Adaptive preprocessing: If the relative humidity RH is detected to be ≥ the set threshold RH0 (e.g., 60%), the heating unit will be activated to preheat the inner wall of the sampling tube, so that the tube wall temperature is 5-10℃ higher than the gas dew point temperature to prevent condensation during the sampling process. If an electrostatic potential V is detected to be ≥ the set threshold V0, the electrostatic eliminator is activated to neutralize the electrostatics until the electrostatic potential drops to a safe range.

[0030] S2. Isolation chamber switching and sampling operation S2.1 Cavity Isolation: A controllable isolation baffle installed inside the sampling tube divides the sampling tube into a sampling chamber and a cleaning chamber, physically isolating the cleaning chamber containing the cleaning mechanism from the sampling gas path.

[0031] S2.2 Negative pressure sampling: Turn on the sampling pump to allow the sample gas to enter the sampling chamber through the sampling inlet and be delivered to the detection equipment through the sampling outlet; during the sampling process, keep the cleaning chamber closed to avoid interference from the cleaning mechanism to the sampling airflow.

[0032] S3. Cleaning and dust suppression after sampling After sampling is completed, an intelligent cleaning program is executed, automatically selecting one or more of the following cleaning modes based on the dust characteristics and static electricity status detected by S1.1: S3.1 Negative Pressure Suction Mode Start the negative pressure pump inside the hollow scraper to create local negative pressure in the suction holes on the scraper; The drive scraper rotates back and forth on the inner wall of the sampling cylinder, and the scraper blade on the scraper scrapes off the dust adhering to the cylinder wall. The scraped dust is sucked into the suction hole at the moment of scraping and transported to the external dust collection container through the negative pressure channel to prevent the dust from flying.

[0033] S3.2 Static Elimination Assist Mode (triggered when S1.1 detects excessive static potential) During the scraper's movement, the static electricity generated by friction is continuously released through the conductive brush bristles integrated on the scraper. Simultaneously, ion air is sprayed into the scraping area through ion air nozzles to neutralize the static electricity on the dust surface and prevent the dust from re-adhering due to static adsorption.

[0034] S3.3 Wet dust suppression mode (selectable when dust concentration C ≥ set threshold C0 and the dust is non-flammable and non-explosive) Before or during the scraper's movement, a dust-suppressing liquid (water or a compatible solvent) is sprayed onto the cylinder wall through a micro-atomizing nozzle integrated on the scraper, forming an extremely thin liquid film. When the scraper removes dust, the dust mixes into the liquid film, forming moist agglomerates that lose their ability to fly and slide down the cylinder wall to the dust collection tank for discharge.

[0035] S3.4 Inert gas purging mode (for flammable and explosive dust or reactive gases) While the scraper is moving, inert gas (nitrogen) is introduced through the annular air curtain nozzle inside the sampling tube to form a downward airflow barrier, which presses the dust into the dust collection tank. The inert gas simultaneously replaces the residual gas inside the cylinder, reducing the oxygen concentration and eliminating the risk of explosion.

[0036] S4. Filter cleaning and synchronous drive When the cleaning mechanism is in operation, the transmission mechanism synchronously drives the brush strip to move up and down reciprocally. The brush on the surface of the brush strip repeatedly cleans the surface of the filter screen set at the sampling inlet, removing residual dust or pollutants blocked by the filter screen; The dust that falls during cleaning is collected and discharged by the negative pressure or gravity in S3.

[0037] S5. Passivation and drying maintenance (to prevent memory effect and microbial growth) S5.1 Passivation treatment: If active gases (such as H2S, HCl, VOCs) are detected in the sample gas, after cleaning, a small amount of passivating agent (silanizing agent) is sprayed onto the cylinder wall through the nozzle on the scraper to form a molecular-level anti-adsorption layer on the cylinder wall.

[0038] S5.2 Thermal Drying: Start the heating unit to raise the temperature inside the cylinder to 60-80℃, and at the same time, purge with dry inert gas for 5-10 minutes to thoroughly dry the environment inside the cylinder and prevent the growth of microorganisms and metal corrosion.

[0039] S6. Sealing and Safety Reset After cleaning, all moving parts are reset and the isolation baffle remains closed to ensure that the sampling chamber and cleaning chamber are physically isolated when the sampling tube is in standby mode, thus preventing external contaminants from entering and internal residues from leaking.

[0040] Reference Figures 1-8 The present invention provides a specific sampling device: Specifically, the system includes a sampling collection port 1, a sampling cylinder 2 located on one side of the sampling collection port 1, a heating tube 21 located inside the sampling cylinder 2, a filter plate 3 located inside the sampling collection port 1, a first cylinder 4 located at the top of the sampling collection port 1, a cleaning plate 41 connected to the output end of the first cylinder 4, a second cylinder 5 located at the top of the sampling collection port 1, and a sealing plate 51 located at the output end of the second cylinder 5. A drive motor 6 is located at the top of the sampling cylinder 2, a rotating shaft 61 is located at the bottom of the drive motor 6, an opening 611 communicating with its inner cavity is opened on the outer side of the rotating shaft 61, a connecting rod 62 is connected to the outer side of the rotating shaft 61, a scraper 63 is connected to the outer side of the connecting rod 62, several sets of air ports 64 are located on one side of the scraper 63, and several sets of nozzles 65 are located on the other side of the scraper 63. An annular air outlet pipe 7 is provided at the top inside the sampling tube 2. An air intake pipe 8 is connected to the bottom of the rotating shaft 61. An annular transfer component 91 is connected to the top of the rotating shaft 61. The annular transfer component 91 is connected to the liquid inlet pipe 9.

[0041] Preferably, when the sampling collection port 1 is facing the sampling area, air enters the sampling cylinder 2 through the sampling collection port 1. The gas will be filtered by the filter plate 3. When testing is required, the second cylinder 5 is activated to drive the sealing plate 51 to ensure a seal. When cleaning is required, the first cylinder 4 is activated to drive the cleaning plate 41 to move, thereby cleaning the filter plate 3. Furthermore, the sensor array collects real-time data on the current environment and the temperature T, relative humidity RH, dust concentration C, and electrostatic potential V inside the sampling tube. When the relative humidity is greater than or equal to the set threshold, heating is performed through heating tube 21 to prevent condensation during the sampling process; When an electrostatic potential ≥ a set threshold is detected, the electrostatic eliminator is activated to neutralize the electrostatic charge. When cleaning is required, air is drawn in through the air inlet 64 connected to the suction pipe 8, and then the scraper 63 scrapes and sucks in the dust at the same time. The scraped dust is sucked in directionally by the dust suction hole at the moment of scraping and is transported to the external dust collection container through the negative pressure channel to prevent dust from flying. Preferably, conductive brush bristles can be integrated into the scraper to generate static electricity through friction. Then, ion air is sprayed onto the scraping area through the ion air nozzle to neutralize the static electricity on the dust surface and prevent the dust from re-adhering due to static adsorption.

[0042] When the dust concentration is greater than or equal to the set threshold and is non-flammable and non-explosive dust, water or a compatible solvent enters the annular transfer unit 91 through the liquid inlet pipe 9, and then enters the rotating shaft 61 through the opening 611. The dust suppressant liquid (water or compatible solvent) is then sprayed onto the cylinder wall through the nozzle 65, forming an extremely thin liquid film. When the scraper removes the dust, the dust mixes into the liquid film to form a moist agglomerate, loses its ability to fly, and slides down the cylinder wall to the dust collection tank for discharge.

[0043] Inert gas (nitrogen) is introduced through the annular outlet pipe 7 inside the sampling tube 2, forming a downward airflow barrier that forces the dust towards the dust collection tank.

[0044] The above provides a detailed description of the chemical safety gas sampling device and method proposed in this invention, and elucidates the principle and implementation of this invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A gas sampling method for chemical safety, characterized in that, Includes the following steps: S1. Before sampling, the operating parameters inside the sampling tube are detected by the sensor group, and adaptive preprocessing is performed based on the detection results. S2. Switch the isolation mechanism to physically isolate the sampling chamber from the clean chamber for gas sampling; S3. After sampling is completed, based on the detected working parameters, one or more of the following modes are automatically selected: negative pressure suction mode, electrostatic elimination auxiliary mode, wet dust suppression mode, and inert gas purging mode. The cleaning mechanism is driven to scrape the inner wall of the sampling tube and collect the scraped material simultaneously. S4. When the cleaning mechanism is running, the cleaning components are driven synchronously to clean the filter screen. S5. Perform passivation treatment and thermal drying, and perform molecular-level anti-adsorption treatment and drying sterilization on the inner wall of the sampling tube; S6. Reset all moving parts and keep the isolation mechanism closed.

2. The chemical safety gas sampling method according to claim 1, characterized in that: The adaptive preprocessing includes activating the heating unit to preheat the inner wall of the sampling cylinder when the relative humidity is detected to be ≥ a set threshold, so that the cylinder wall temperature is higher than the gas dew point temperature. When an electrostatic potential ≥ a set threshold is detected, the electrostatic eliminator is activated to neutralize the electrostatic charge.

3. The chemical safety gas sampling method according to claim 1, characterized in that: The negative pressure suction mode specifically involves activating the negative pressure pump inside the hollow scraper to generate local negative pressure in the dust suction holes on the scraper; while the scraper removes dust, the dust is directionally sucked into the dust suction holes and transported to the external dust collection container through the negative pressure flow channel.

4. The chemical safety gas sampling method according to claim 1, characterized in that: The wet dust suppression mode is as follows: before or during the movement of the scraper, a dust suppression liquid is sprayed onto the cylinder wall through a micro-atomizing nozzle on the scraper to form a liquid film; the scraped dust mixes into the liquid film to form moist agglomerates, which slide down the cylinder wall to the dust collection tank.

5. The chemical safety gas sampling method according to claim 1, characterized in that: The inert gas purging mode is as follows: while the scraper is moving, inert gas is introduced through an annular air curtain nozzle to form a downward airflow barrier; the inert gas replaces the residual gas in the cylinder, reducing the oxygen concentration.

6. The chemical safety gas sampling method according to claim 1, characterized in that: The passivation treatment specifically involves: when an active gas is detected in the sample gas, a passivating agent is sprayed onto the cylinder wall through a nozzle after cleaning to form a molecular-level anti-adsorption layer.

7. The chemical safety gas sampling method according to claim 1, characterized in that: The thermal drying process specifically involves: starting the heating unit to raise the temperature inside the cylinder to 60-80℃, while simultaneously introducing dry inert gas to purge and achieve drying and sterilization.

8. A gas sampling device for chemical safety, characterized in that: The chemical safety gas sampling method according to any one of claims 1 to 7 includes, A sampling collection port (1), a sampling tube (2) located on one side of the sampling collection port (1), a heating tube (21) located inside the sampling tube (2), a filter plate (3) located inside the sampling collection port (1), a first cylinder (4) located at the top of the sampling collection port (1), a cleaning plate (41) connected to the output end of the first cylinder (4), a second cylinder (5) located at the top of the sampling collection port (1), and a sealing plate (51) located at the output end of the second cylinder (5).

9. The chemical safety gas sampling device according to claim 8, characterized in that: The top of the sampling tube (2) is provided with a drive motor (6), the bottom of the drive motor (6) is provided with a rotating shaft (61), the outer side of the rotating shaft (61) is provided with an opening (611) communicating with its inner cavity, the outer side of the rotating shaft (61) is connected with a connecting rod (62), the outer side of the connecting rod (62) is connected with a scraper (63), one side of the scraper (63) is provided with several sets of air ports (64), and the other side of the scraper (63) is provided with several sets of nozzles (65).

10. The chemical safety gas sampling device according to claim 9, characterized in that: An annular air outlet pipe (7) is provided inside the sampling tube (2) at the top. An air intake pipe (8) is connected to the bottom of the rotating shaft (61). An annular transfer device (91) is connected to the top of the rotating shaft (61). The annular transfer device (91) is connected to the liquid inlet pipe (9).

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