A gas detection device for process equipment and control engineering

Abstract

The application relates to the technical field of gas detection, and particularly discloses a gas detection device for process equipment and control engineering, which comprises a gas guiding unit, a tar cleaning unit and a gas detection unit. The tar is broken into micron-sized mist drops through a Venturi injection structure, and then is efficiently separated through a mist capturing backflow structure, so that tar pollution is greatly reduced from the source. An elastic plugging structure realizes one-way traffic and automatic sealing of airflow, and prevents backflow interference. Meanwhile, an airflow-driven pneumatic rotary sweeping structure is used to perform circumferential rotary sweeping on a detection probe, so that adhered tar is completely removed, the probe is kept clean at all times, the gas detection precision and long-term stability are effectively improved, and the device is particularly suitable for industrial gas monitoring scenes with high tar content.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and more specifically, to a gas detection device for process equipment and control engineering. Background Technology

[0002] In industrial processes such as coal gasification and incineration power generation, continuous online monitoring of high-temperature, high-humidity, dust-laden gases (such as coal gasification syngas: temperature 150-250℃, containing a large amount of water vapor, tar, and fly ash) is crucial for ensuring process stability and safe production.

[0003] For the aforementioned gas detection conditions, existing sampling probes typically employ a straight-through or simple L-shaped structure. When extracting high-temperature dusty gases, the tar in the gas has high adhesion and condensation properties. Upon direct contact with the probe, a viscous coating layer easily forms on its surface. Tar accumulation gradually shields the probe's sensitive elements, leading to delayed response, decreased sensitivity, or even complete failure, severely impacting the continuity and reliability of online monitoring. Furthermore, the probe is constantly exposed to the gas path, and even during non-detection periods, it cannot avoid contact with the tar atmosphere. Tar vapor can slowly condense and deposit on the probe surface, forming stubborn dirt that is difficult to remove, resulting in initial response deviations and affecting the long-term consistency of detection accuracy. Summary of the Invention

[0004] To overcome the above-mentioned technical problems, the present invention proposes a gas detection device for process equipment and control engineering.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A gas detection device for process equipment and control engineering, comprising:

[0007] A gas diversion unit includes a diversion pipe, in which a Venturi ejector structure is embedded, and a mist-catching and reflux structure is provided at the outlet end of the diversion pipe.

[0008] A tar cleaning unit is connected to the outlet end of a drainage pipe, including a connecting pipe, wherein an elastic sealing structure is movably embedded in the connecting pipe, and a pneumatic rotary sweeping structure is provided at the center of the elastic sealing structure.

[0009] A gas detection unit, which is connected to the outlet end of a connecting pipe, includes a gas detection chamber and a detection element installed on the shaft end of the gas detection chamber. The detection element is equipped with a detection probe that extends into the gas detection chamber. An exhaust pipe is connected to one side of the gas detection chamber.

[0010] As a further aspect of the present invention: the Venturi ejector structure includes a tapering section, a necking section, and a diffusion section connected in sequence.

[0011] As a further aspect of the present invention: the mist-catching and recirculation structure includes a central diversion column coaxially disposed at the outlet end of the diversion pipe. The central diversion column is fixed inside the diversion pipe by multiple sets of connecting frames arranged circumferentially. A mist-catching cover is fixed to one end of the central diversion column facing the outlet of the diversion pipe by a support column.

[0012] As a further aspect of the present invention: a conical hood that connects to the mist-collecting hood is provided on the inner side of the drainage pipe, and a return groove is provided on the outer side of the bottom of the conical hood.

[0013] As a further aspect of the present invention: the elastic sealing structure includes a sealing ring plate fixed inside the connecting pipe, a telescopic end cap slidably embedded in the sealing ring plate, and a first spring abutting against the gas detection chamber at one end of the telescopic end cap facing the gas detection chamber.

[0014] As a further embodiment of the present invention: the telescopic end cap includes a sealing disc that is slidably connected to the inner wall of the gas detection chamber, and a transition cover that is slidably adapted to the inner wall of the sealing ring is coaxially provided at the bottom of the sealing disc. The transition cover has a plurality of transition holes circumferentially provided, and the outer side of the sealing disc has a plurality of intercepting mesh sheets circumferentially provided.

[0015] As a further aspect of the present invention: the pneumatic rotary sweeping structure includes a rotating shaft rotatably mounted at the center of the sealing disc, a turbine blade is provided at one end of the rotating shaft facing the inside of the transition cover, and a rotary sweeping component is provided at the other end of the rotating shaft facing the inside of the gas detection chamber.

[0016] As a further aspect of the present invention: the rotary scanning component includes a mounting platform fixed coaxially with the rotating shaft, and a scraper adapted to the outer contour of the detection probe is provided on one side of the mounting platform.

[0017] As a further aspect of the present invention: a central airbag is provided on the axial end of the mounting platform facing the detection probe, a central air cavity communicating with the central airbag is provided in the mounting platform, a flexible bladder is provided on the end face of the scraper that is in contact with the detection probe, an expansion air cavity communicating with the flexible bladder is provided in the scraper, and an air passage is connected between the expansion air cavity and the central air cavity.

[0018] As a further embodiment of the present invention: the gas detection chamber is further provided with a covering structure adapted to the detection probe. The covering structure includes an installation cavity opened in the gas detection chamber, a push plate is axially slidably installed in the installation cavity, a second spring is provided in the installation cavity to abut against the push plate, and a covering ring adapted to the outer peripheral surface of the detection probe is provided on the push plate.

[0019] The elastic sealing structure is provided with a push rod for pushing the push plate, and the gas detection chamber is provided with a through hole to accommodate the push rod.

[0020] The beneficial effects of this invention are:

[0021] This invention utilizes a Venturi ejector structure embedded in the drainage channel to generate a high-speed airflow as the gas flows through the throat. This airflow creates a significant velocity difference with the tar droplets, tearing and breaking large-diameter tar droplets into micron-sized aerosol droplets through viscous shear force. Simultaneously, it enhances turbulent mixing, creating favorable conditions for subsequent capture and separation. Subsequently, the oil-gas-liquid droplets are efficiently captured and separated by the mist-catching and recirculation structure, significantly reducing the tar content entering the detection unit and minimizing tar contamination of the detection probe at the source.

[0022] The elastic sealing structure in the tar cleaning unit automatically opens towards the gas detection chamber under the pressure of the airflow, enabling one-way gas passage. When the airflow stops or the pressure reverses, the elastic sealing structure resets and seals, effectively preventing gas backflow and external impurities from entering the detection chamber, ensuring the stability of the detection environment and the accuracy of the measurement results.

[0023] When gas flows through the elastic sealing structure, it synchronously drives the pneumatic rotary sweeping structure at its center to rotate circumferentially. At the same time, the pneumatic rotary sweeping structure moves axially with the elastic sealing structure and contacts the detection probe, performing a circumferential rotary sweep on the probe surface to thoroughly remove tar impurities adhering to it. This effectively eliminates the interference of tar impurities on the detection probe, keeping the detection probe in a clean state at all times. This ensures that the detection element of the gas detection unit can acquire accurate gas composition data in real time, making it particularly suitable for industrial gas monitoring scenarios with high tar content. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0026] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0027] Figure 3 This is a cross-sectional structural schematic diagram from another perspective of the present invention;

[0028] Figure 4 This is a cross-sectional view of the gas diversion unit in this invention;

[0029] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 for Figure 4 Enlarged view at point B in the middle;

[0031] Figure 7 This is a schematic diagram of the internal structure of the tar cleaning unit and the gas detection unit in this invention;

[0032] Figure 8 for Figure 7 Enlarged view at point C;

[0033] Figure 9 This is a three-dimensional schematic diagram of the elastic sealing structure and the pneumatic rotary sweeping structure in this invention;

[0034] Figure 10 This is a cross-sectional schematic diagram of the elastic sealing structure and the pneumatic rotary sweeping structure in this invention;

[0035] Figure 11 for Figure 10 Enlarged view of point D in the middle.

[0036] In the picture:

[0037] 100. Gas diversion unit; 110. Diversion pipe; 120. Venturi ejector structure; 121. Tapered section; 122. Necked section; 123. Diffusion section; 130. Mist catching and recirculation structure; 131. Central diversion column; 132. Connecting frame; 133. Support column; 134. Mist catching hood; 135. Conical diversion hood; 136. Recirculation groove;

[0038] 200. Tar cleaning unit; 210. Connecting pipe; 220. Elastic sealing structure; 221. Sealing ring; 222. Telescopic end cap; 2221. Sealing disc; 2222. Transition cover; 2223. Transition hole; 2224. Interception mesh; 223. First spring; 230. Pneumatic rotary sweeping structure; 231. Rotating shaft; 232. Turbine blade; 233. Rotary sweeping component; 2331. Mounting platform; 2332. Scraper; 2333. Central airbag; 2334. Central air chamber; 2335. Flexible bladder; 2336. Expansion air chamber; 2337. Air passage;

[0039] 300. Gas detection unit; 310. Gas detection chamber; 311. Through hole; 320. Detection element; 330. Detection probe; 340. Transmission line; 350. Exhaust pipe; 360. Covering structure; 361. Mounting cavity; 362. Push plate; 363. Second spring; 364. Covering ring; 365. Top rod. Detailed Implementation

[0040] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0041] Please see Figure 1 , Figure 2 and Figure 3 This invention discloses a gas detection device for process equipment and control engineering, comprising a gas diversion unit 100, a tar cleaning unit 200, and a gas detection unit 300. The gas diversion unit 100 includes a diversion pipe 110, in which a Venturi ejector structure 120 is embedded, and a mist-collecting and recirculating structure 130 is provided at the outlet end of the diversion pipe 110. The tar cleaning unit 200 is connected to the outlet end of the diversion pipe 110 and includes a connecting pipe 210, in which an elastic sealing structure 220 is movably embedded, and a pneumatic rotary sweeping structure 230 is provided at the center of the elastic sealing structure 220. The gas detection unit 300 is connected to the outlet end of the connecting pipe 210 and includes a gas detection chamber 310 and a detection element 320 installed on the shaft end of the gas detection chamber 310. A detection probe 330 extending into the gas detection chamber 310 is provided on the detection element 320, and an exhaust pipe 350 is connected to one side of the gas detection chamber 310.

[0042] Specifically, the gas to be tested is introduced into the inlet pipe 110. When the gas flows through the throat of the Venturi ejector structure 120, the airflow velocity increases sharply, and a huge velocity difference is generated between the gas and the tiny tar droplets. The viscous shear force generated by the velocity difference acts on the surface of the droplets, causing the larger tar droplets to be torn and broken into smaller micron-sized droplets. Subsequently, the strong turbulence and acceleration make the oil vapor and carrier gas mix evenly, generating fine aerosol droplets at the end of the Venturi ejector structure 120. When the aerosol droplets pass through the mist-catching and recirculating structure 130, the oil vapor droplets are captured by the mist-catching and recirculating structure 130, and the oil vapor droplets are separated from the gas.

[0043] After initial separation of oil mist, the gas enters the connecting pipe 210. Under the pressure of the airflow, the elastic sealing structure 220 is pushed open towards the gas detection chamber 310, allowing the gas to enter the gas detection chamber 310 in one direction. As the gas flows through the elastic sealing structure 220, it simultaneously drives the pneumatic rotary sweeping structure 230 to rotate circumferentially. At the same time, the pneumatic rotary sweeping structure 230 follows the elastic sealing structure 220 axially and approaches and contacts the detection probe 330, thereby performing a circumferential rotary sweep on the detection probe 330 to remove tar impurities adhering to the surface of the detection probe 330 and improve the gas detection accuracy. The gas in the gas detection chamber 310 is detected by the detection probe 330 on the detection element 320. The detection data is transmitted to the upstream processing equipment via the transmission line 340. Finally, the detected gas is discharged from the exhaust pipe 350 on one side of the gas detection chamber 310.

[0044] It should be noted that the present invention utilizes the Venturi ejector structure 120 embedded in the drainage pipe 110 to generate a high-speed airflow when the gas flows through the throat, forming a huge velocity difference with the tar droplets. Through viscous shear force, the large-diameter tar droplets are torn and broken into micron-sized aerosol droplets, while enhancing turbulent mixing and creating favorable conditions for subsequent capture and separation. Subsequently, the mist-catching and recirculation structure 130 efficiently captures the oil, gas and liquid droplets and achieves gas-liquid separation, significantly reducing the tar content entering the detection unit and reducing tar contamination of the detection probe 330 from the source.

[0045] The elastic sealing structure 220 in the tar cleaning unit 200 automatically opens towards the gas detection chamber 310 under the action of airflow pressure, realizing one-way gas passage; when the airflow stops or the pressure reverses, the elastic sealing structure 220 resets and seals, effectively preventing gas backflow in the detection chamber and the intrusion of external impurities, ensuring the stability of the detection environment and the accuracy of the measurement results.

[0046] When gas flows through the elastic sealing structure 220, it synchronously drives the pneumatic rotary sweeping structure 230 at its center to rotate circumferentially. At the same time, the pneumatic rotary sweeping structure 230 moves axially with the elastic sealing structure 220 and contacts the detection probe 330, performing a circumferential rotary sweep on the probe surface to thoroughly remove tar impurities adhering to it. This effectively eliminates the interference of tar impurities on the detection probe 330, keeping the detection probe 330 in a clean state at all times. This ensures that the detection element 320 of the gas detection unit 300 can acquire accurate gas composition data in real time, which is especially suitable for industrial gas monitoring scenarios with high tar content.

[0047] In one embodiment, please refer to Figure 4 and Figure 5 The Venturi ejector structure 120 includes a tapered section 121, a necked section 122, and a diffuser section 123 connected in sequence.

[0048] Specifically, when the gas transitions from the converging section 121 to the necking section 122, the airflow velocity increases sharply, causing larger tar droplets to be torn apart into smaller micron-sized droplets. Subsequently, the airflow transitions from the necking section 122 to the diffusion section 123. The intense turbulence and acceleration cause the oil vapor to mix evenly with the carrier gas, generating fine aerosol droplets at the end of the diversion pipe 110.

[0049] It is worth noting that by setting up a gradient airflow acceleration channel through a series of connected converging sections 121, necking sections 122, and diffuser sections 123, a gradient airflow acceleration channel is formed. When the gas transitions from the converging section 121 to the necking section 122, the flow cross-section decreases sharply, and the airflow velocity increases exponentially, generating a huge velocity difference and viscous shear force, which efficiently tears and breaks up the large-diameter tar droplets carried in the gas. Subsequently, when entering the diffuser section 123, the gradient change in airflow velocity further enhances the turbulence intensity, causing the remaining larger droplets to be broken up a second time in inertial collisions, ultimately generating micron-sized uniform droplets, thus improving the pretreatment capability for high-viscosity tar.

[0050] The constricted section 122, as the core throat of the Venturi structure, is where the relative velocity between the gas and liquid phases reaches its peak, which not only improves the droplet breaking efficiency but also enhances the momentum exchange and energy transfer between oil vapor and carrier gas.

[0051] After the airflow enters the diffuser section 123 from the constriction section 122, the flow area suddenly expands, causing strong turbulent pulsations and backflow, which enables the oil vapor and carrier gas to achieve highly uniform mixing at both the macroscopic and microscopic scales. This generates fine aerosol droplets with narrow particle size distribution and high dispersion at the end of the diversion pipe 110. This homogenization process effectively avoids local tar aggregation and greatly improves the collection efficiency of the subsequent mist-catching backflow structure 130.

[0052] The entire tar crushing process relies entirely on the geometric properties of the Venturi structure itself to guide the airflow, which avoids tar carbonization and blockage of the pipeline caused by high temperature, and also prevents secondary impurities that may be introduced by chemical treatment, ensuring the integrity of the original gas components. It is especially suitable for process control scenarios with strict requirements for component accuracy.

[0053] The fine aerosol droplets generated by the Venturi structure have significantly reduced particle size and uniform distribution, making it easier for tar to be captured and separated by the fog return structure 130. This greatly reduces the risk of downstream detection probe 330 being contaminated by tar, ensuring the long-term stable operation and detection accuracy of the gas detection unit 300 from the source.

[0054] Further, please refer to Figure 4 and Figure 6 The mist-catching and reflux structure 130 includes a central diversion column 131 coaxially disposed at the outlet end of the diversion pipe 110. The central diversion column 131 is fixed inside the diversion pipe 110 by multiple sets of connecting frames 132 arranged circumferentially. A mist-catching cover 134 is fixed to one end of the central diversion column 131 facing the outlet of the diversion pipe 110 by a support column 133.

[0055] The inner side of the drainage pipe 110 is provided with a conical drainage hood 135 that is connected to the mist hood 134, and a return groove 136 is provided on the outer side of the bottom of the conical drainage hood 135.

[0056] Specifically, the oil mist gas flow ejected from the Venturi ejector structure 120 is guided by the central diversion column 131, causing the oil mist gas flow to violently collide with the inner wall of the mist-catching hood 134 at the end of the diversion pipe 110. The mist-catching hood 134 is used to capture the oil mist droplets, while the gas flows upward from the gap between the conical diversion hood 135 and the mist-catching hood 134 into the connecting pipe 210. Tiny droplets adhere to the inner wall of the mist-catching hood 134 and converge into large droplets, which fall from the bottom edge of the mist-catching hood 134 to the conical diversion hood 135. The conical diversion hood 135 guides the oil and discharges it into the return tank 136, thereby achieving effective separation of oil and gas.

[0057] It should be noted that by setting the central diversion column 131 to axially guide the high-speed aerosol airflow ejected by the Venturi ejector structure 120, the airflow is forced to impact the inner wall of the mist-collecting hood 134 in a directional manner, causing the airflow to violently collide with the inner wall of the mist-collecting hood 134. The inertial force of the droplets is used to break through the air film constraint and adhere to the wall surface, thereby improving the one-time collection efficiency of micron-sized tar droplets and preventing the droplets from escaping with the airflow.

[0058] The annular gap formed between the fog-catching hood 134 and the conical guide hood 135 forces the airflow to bypass the inner wall of the fog-catching hood 134 and instead go around the gap between them. This increases the gas residence time, giving tiny droplets more opportunities to adhere to the wall surface through diffusion and collision, while ensuring that the clean gas can smoothly enter the next unit and achieve efficient gas-liquid separation.

[0059] Tiny droplets adhering to the inner wall of the mist-collecting hood 134 flow downwards along the wall under the shearing force of the airflow and gravity, and converge into large droplets at the bottom edge of the mist-collecting hood 134. The large droplets then fall to the conical guide hood 135 below by their own weight. The conical guide hood 135 adopts a conical surface design to collect and guide the dripping oil, allowing it to flow smoothly into the return groove 136 opened at the bottom along the conical surface. This prevents the oil from being entrained by the high-speed airflow and facilitates subsequent centralized discharge or treatment, avoiding the risk of blockage caused by tar accumulation in the pipeline.

[0060] Through the aforementioned multi-stage capture and reflux mechanism, most of the tar droplets in the gas flow are captured and discharged, significantly reducing the tar content of the gas entering the connecting pipe 210. This fundamentally reduces the risk of tar contamination to the subsequent elastic sealing structure 220 and detection probe 330, enabling the gas detection unit 300 to maintain high accuracy and stability during long-term operation. It is particularly suitable for online monitoring scenarios of industrial gases with high tar content.

[0061] In yet another embodiment, please refer to Figure 7The elastic sealing structure 220 includes a sealing ring 221 fixed in the connecting pipe 210. A telescopic end cap 222 is axially slidably embedded in the sealing ring 221. A first spring 223 is provided at one end of the telescopic end cap 222 facing the gas detection chamber 310 to abut against the gas detection chamber 310.

[0062] Specifically, in the initial state, due to the elastic force of the first spring 223, the telescopic head 222 is always retracted into the sealing ring 221, thereby using the sealing structure of the sealing ring 221 and the telescopic head 222 to block the gas passage between the connecting pipe 210 and the gas detection chamber 310; when the airflow pressure in the connecting pipe 210 is sufficient to overcome the elastic force of the first spring 223, the airflow pushes the telescopic head 222 to slide axially upward relative to the sealing ring 221, thereby pushing the telescopic head 222 open towards the gas detection chamber 310, forcing the airflow to flow into the gas detection chamber 310 through the telescopic head 222; when the airflow flows through the telescopic head 222, it synchronously drives the first spring 223 to move, so as to realize the circumferential rotary cleaning of the detection probe 330.

[0063] It is worth noting that the sliding sealing pair formed by the sealing ring 221 and the telescopic end cap 222, combined with the preload of the first spring 223, forms a normally closed one-way sealing structure in the absence of airflow or under low pressure, effectively preventing gas backflow or intrusion of external impurities in the gas detection chamber 310; when the airflow pressure in the connecting pipe 210 exceeds the threshold set by the first spring 223, the telescopic end cap 222 automatically overcomes the elastic force and slides open axially, realizing pressure adaptive on / off control of the gas path;

[0064] When the airflow passes through the telescopic end cap 222, its kinetic energy is directly converted into mechanical energy to drive the first spring 223 to move. This simultaneously achieves circumferential rotary cleaning of the detection probe 330, ensuring that every stream of air entering the gas detection chamber 310 is accompanied by automatic cleaning of the detection probe 330. This avoids the accumulation of tar on the probe surface and ensures the synchronization of the cleaning action and the detection process, improving the continuity and accuracy of the detection data. It is especially suitable for industrial process control scenarios with large fluctuations in tar content or high detection frequency, and ensures the long-term stability of detection accuracy from a mechanism perspective.

[0065] Further, please refer to Figure 9 and Figure 10 The telescopic end cap 222 includes a sealing disc 2221 that is slidably connected to the inner wall of the gas detection chamber 310. A transition cover 2222 that is slidably adapted to the inner wall of the sealing ring 221 is coaxially provided at the bottom of the sealing disc 2221. The transition cover 2222 has a plurality of transition holes 2223 circumferentially opened, and a plurality of intercepting mesh sheets 2224 are circumferentially opened on the outer side of the sealing disc 2221.

[0066] Specifically, the airflow in the connecting pipe 210 enters the transition cover 2222 through the bottom opening of the transition cover 2222, and then pushes the sealing disc 2221 to move axially, causing the transition cover 2222 and the sealing ring 221 to slide axially until the transition hole 2223 is exposed in the gas detection chamber 310. Then the airflow in the transition cover 2222 can penetrate radially through each transition hole 2223 to the outside of the transition cover 2222. Then the airflow passes upward through each interception mesh 2224 to reach the gas detection chamber 310 above the sealing disc 2221. The interception mesh 2224 further intercepts the tar particles in the airflow, thereby effectively reducing the tar content of the gas to be tested in the gas detection chamber 310.

[0067] It should be noted that the transition holes 2223 are evenly opened around the transition cover 2222, so that the airflow entering the transition cover 2222 can be evenly diffused radially to the surrounding area, avoiding the concentrated jet of airflow from causing scouring or disturbance to local areas (such as the detection probe 330). This radial outflow design makes the airflow distribution into the gas detection chamber 310 more uniform, providing a stable sampling environment for the detection probe 330, which helps to improve the repeatability and accuracy of the detection data.

[0068] The intercepting mesh 2224 arranged circumferentially on the outer side of the sealing disk 2221 performs inertial collision and interception adsorption on the tiny tar particles that may remain in the airflow. Even tar particles that are not completely separated by the upstream Venturi ejector structure 120 and the mist-catching return structure 130 can be effectively captured here. The intercepting mesh 2224 is not an independent filter element, but is integrated on the moving sealing disk 2221, so that the filter structure moves synchronously with the telescopic end cap 222. It does not affect the axial sliding of the sealing disk 2221, and can automatically filter every time it is opened. The circumferential arrangement of the intercepting mesh 2224 also plays a certain role in airflow rectification, further optimizing the flow field distribution.

[0069] The airflow path within the telescopic end cap 222 is as follows: it enters the transition cover 2222 through the bottom opening → passes radially through the transition hole 2223 → passes upward through the intercepting mesh 2224 → enters the gas detection chamber 310. This Z-shaped flow path, which involves axial, then radial, and then axial again, increases the residence time of the gas in the limited space, giving tiny tar particles more opportunities to adhere to the wall and mesh through inertial settling or collision, further improving the thoroughness of gas-liquid separation.

[0070] Furthermore, please refer to Figure 7 and Figure 10 The pneumatic rotary sweeping structure 230 includes a rotating shaft 231 rotatably mounted at the center of the sealing disk 2221. A turbine blade 232 is provided at one end of the rotating shaft 231 facing into the transition cover 2222, and a rotary sweeping component 233 is provided at one end of the rotating shaft 231 facing into the gas detection chamber 310.

[0071] Specifically, when the airflow enters from the bottom of the transition cover 2222 and flows out from each transition hole 2223 on the side, it can drive the turbine blades 232 to rotate, thereby driving the rotating shaft 231 and the rotary sweeping member 233 to rotate synchronously in the circumferential direction. When the rotary sweeping member 233 contacts the detection probe 330, the circumferentially rotating rotary sweeping member 233 can be used to perform rotary sweeping cleaning on the detection probe 330.

[0072] Accordingly, please refer to Figure 10 and Figure 11 The rotary scanning component 233 includes a mounting platform 2331 that is coaxially fixed with the rotating shaft 231, and a scraper 2332 adapted to the outer contour of the detection probe 330 is provided on one side of the mounting platform 2331.

[0073] A central airbag 2333 is provided on the shaft end of the mounting platform 2331 facing the detection probe 330. A central air cavity 2334 communicating with the central airbag 2333 is opened in the mounting platform 2331. A flexible bladder 2335 is provided on the end face of the scraper 2332 that is in contact with the detection probe 330. An expansion air cavity 2336 communicating with the flexible bladder 2335 is opened in the scraper 2332. An air passage 2337 is connected between the expansion air cavity 2336 and the central air cavity 2334.

[0074] Specifically, when the mounting platform 2331 follows the elastic sealing structure 220 and the rotating shaft 231 axially closes to and contacts the detection probe 330, the central airbag 2333 is gradually compressed and contracted axially, thereby squeezing the gas in the central air chamber 2334 into the expansion air chamber 2336 through the air passage 2337, which in turn causes the flexible bladder 2335 to expand radially and fit tightly against the outer wall of the detection probe 330, so as to improve the cleaning effect of the subsequent scraper 2332 on the tar adhering to the detection probe 330.

[0075] It should be noted that the flow kinetic energy of the airflow entering from the bottom of the transition cover 2222 and flowing radially out through the transition hole 2223 drives the turbine blades 232 to rotate, thereby driving the rotating shaft 231 and the swirl sweeping component 233 to rotate synchronously.

[0076] When the mounting platform 2331 follows the elastic sealing structure 220 and approaches the detection probe 330 axially, the central airbag 2333 is compressed and contracts, squeezing the gas in the central air chamber 2334 into the expansion air chamber 2336 through the air passage 2337. This causes the flexible bladder 2335 to expand radially, so that the contact pressure between the scraper 2332 and the detection probe 330 is automatically adjusted with the axial feed. The tighter the axial contact, the greater the radial expansion and the stronger the scraping force. This achieves adaptive control of the cleaning force and avoids damage to the probe surface caused by rigid scraping.

[0077] The flexible capsule 2335 is set on the end face where the scraper 2332 and the detection probe 330 are attached. Under the action of air pressure, it can adaptively deform according to the shape of the outer contour of the probe to achieve a tight fit with the probe surface. This not only increases the cleaning contact area and improves the tar removal efficiency, but also avoids the scratches or wear that may be caused by the rigid scraper. It can effectively remove stubborn tar and remove loosely attached dust and liquid film, effectively protecting the surface smoothness and measurement accuracy of the precision detection probe 330.

[0078] In further embodiments, please refer to Figure 7 and Figure 8 The gas detection chamber 310 is also provided with a covering structure 360 ​​adapted to the detection probe 330. The covering structure 360 ​​includes an installation cavity 361 opened in the gas detection chamber 310. A push plate 362 is axially slidably installed in the installation cavity 361. A second spring 363 is provided in the installation cavity 361 and abuts against the push plate 362. A covering ring 364 adapted to the outer peripheral surface of the detection probe 330 is provided on the push plate 362.

[0079] The elastic sealing structure 220 is provided with a push rod 365 for pushing the push plate 362, and the gas detection chamber 310 is provided with a through hole 311 to accommodate the push rod 365.

[0080] Specifically, in the initial state, due to the elastic force of the second spring 363, the covering ring 364 always extends out of the mounting cavity 361 and wraps around the detection probe 330, thereby protecting the detection probe 330 in the non-detection state. When the elastic sealing structure 220 is pushed by the airflow to move axially towards the gas detection chamber 310, the push rod 365 moves synchronously until the push rod 365 is inserted into the mounting cavity 361 through the through hole 311. The push rod 365 then pushes the push plate 362 to move axially, thereby driving the covering ring 364 to gradually retract into the mounting cavity 361, thus exposing the detection probe 330 for subsequent gas detection.

[0081] It is worth noting that, through the pre-tightening force of the second spring 363, the covering ring 364 always extends out of the mounting cavity 361 and tightly wraps around the outside of the detection probe 330 in the initial state. During standby or non-detection periods, it builds a physical barrier for the detection probe 330, effectively isolating the probe from contamination caused by factors such as tar splashes, dust adhesion, and moisture corrosion in the external environment.

[0082] The push rod 365 is fixed to the elastic sealing structure 220 and moves forward and backward synchronously with its axial movement. When the airflow pushes the elastic sealing structure 220 to open, the push rod 365 is inserted into the mounting cavity 361 through the through hole 311 and pushes the push plate 362, forcing the covering ring 364 to retract. When the airflow disappears and the elastic sealing structure 220 is reset, the push rod 365 is withdrawn, and the covering ring 364 is ejected again to wrap the detection probe 330 under the action of the second spring 363.

[0083] The retraction of the covering ring 364 and the exposure of the detection probe 330 occur precisely at the moment the airflow enters the gas detection chamber 310; while the ejection of the covering ring 364 and the wrapping of the probe are executed immediately after the airflow is cut off, ensuring that the probe is only exposed to the gas to be tested for a short period of time when sampling is required, minimizing the contact time between the probe and the polluted environment, and ensuring the authenticity and stability of the detection data.

[0084] The covering ring 364 adopts a contoured structure that is adapted to the outer peripheral surface of the detection probe 330. Under the thrust of the second spring 363, it can form a tight fit with the probe surface and even generate a certain pre-pressure, thereby creating a sealed isolation layer between the probe and the external environment. This effectively prevents tar vapor from penetrating into the sensitive area of ​​the probe through tiny gaps, thus improving the thoroughness of protection.

[0085] The specific embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A gas detection device for process equipment and control engineering, characterized in that, include: A gas diversion unit (100) includes a diversion pipe (110), in which a Venturi ejector structure (120) is embedded, and a mist-catching and reflux structure (130) is provided at the outlet end of the diversion pipe (110). Tar cleaning unit (200) is connected to the outlet end of the drainage pipe (110) and includes a connecting pipe (210). An elastic sealing structure (220) is movably embedded in the connecting pipe (210), and a pneumatic rotary sweeping structure (230) is provided at the center of the elastic sealing structure (220). A gas detection unit (300) is connected to the outlet end of a connecting pipe (210), including a gas detection chamber (310) and a detection element (320) installed on the shaft end of the gas detection chamber (310). The detection element (320) is provided with a detection probe (330) that extends into the gas detection chamber (310). An exhaust pipe (350) is connected to one side of the gas detection chamber (310). The Venturi ejector structure (120) includes a tapered section (121), a necked section (122), and a diffuser section (123) connected in sequence. The mist-catching and reflux structure (130) includes a central diversion column (131) coaxially disposed at the outlet end of the diversion pipe (110). The central diversion column (131) is fixed inside the diversion pipe (110) by multiple sets of connecting frames (132) arranged circumferentially. A mist-catching cover (134) is fixed to one end of the central diversion column (131) facing the outlet of the diversion pipe (110) by a support column (133). The inner side of the drainage pipe (110) is provided with a conical drainage hood (135) that is connected to the mist hood (134), and a return groove (136) is provided on the outer side of the bottom of the conical drainage hood (135).

2. The gas detection device for process equipment and control engineering according to claim 1, characterized in that, The elastic sealing structure (220) includes a sealing ring (221) fixed in the connecting pipe (210), and a telescopic head (222) is axially slidably embedded in the sealing ring (221). The telescopic head (222) is provided with a first spring (223) at one end facing the gas detection chamber (310) and abutting against the gas detection chamber (310).

3. The gas detection device for process equipment and control engineering according to claim 2, characterized in that, The telescopic end cap (222) includes a sealing disc (2221) that is slidably connected to the inner wall of the gas detection chamber (310). The bottom of the sealing disc (2221) is coaxially provided with a transition cover (2222) that is slidably adapted to the inner wall of the sealing ring (221). The transition cover (2222) has several transition holes (2223) circumferentially opened, and the outer side of the sealing disc (2221) has several intercepting mesh sheets (2224) circumferentially opened.

4. A gas detection device for process equipment and control engineering according to claim 3, characterized in that, The pneumatic rotary sweeping structure (230) includes a rotating shaft (231) rotatably mounted at the center of the sealing disc (2221). A turbine blade (232) is provided at one end of the rotating shaft (231) facing the inside of the transition cover (2222), and a rotary sweeping component (233) is provided at the other end of the rotating shaft (231) facing the inside of the gas detection chamber (310).

5. A gas detection device for process equipment and control engineering according to claim 4, characterized in that, The rotary scanning component (233) includes a mounting platform (2331) coaxially fixed with the rotating shaft (231), and a scraper (2332) adapted to the outer contour of the detection probe (330) is provided on one side of the mounting platform (2331).

6. A gas detection device for process equipment and control engineering according to claim 5, characterized in that, The mounting platform (2331) has a central airbag (2333) at the shaft end facing the detection probe (330). The mounting platform (2331) has a central air chamber (2334) communicating with the central airbag (2333). The scraper (2332) has a flexible bladder (2335) on the end face that is in contact with the detection probe (330). The scraper (2332) has an expansion air chamber (2336) communicating with the flexible bladder (2335). The expansion air chamber (2336) and the central air chamber (2334) are connected by an air passage (2337).

7. A gas detection device for process equipment and control engineering according to claim 1, characterized in that, The gas detection chamber (310) is also provided with a covering structure (360) adapted to the detection probe (330). The covering structure (360) includes an installation cavity (361) opened in the gas detection chamber (310). A push plate (362) is axially slidably installed in the installation cavity (361). A second spring (363) abutting against the push plate (362) is provided in the installation cavity (361). A covering ring (364) adapted to the outer peripheral surface of the detection probe (330) is provided on the push plate (362). The elastic sealing structure (220) is provided with a push rod (365) for pushing the push plate (362), and the gas detection chamber (310) is provided with a through hole (311) for accommodating the push rod (365).

Images