Anti-blocking self-flushing pressure tapping pipe structure of denitration pressure measuring instrument

Abstract

The invention discloses an anti-blocking self-flushing denitration pressure measuring instrument pressure tapping pipe structure which comprises a pipeline and a pressure tapping pipe obliquely arranged on the pipeline, a pressure gauge is arranged on the pressure tapping pipe, a driving device is arranged on the side of the pressure tapping pipe, a cleaning mechanism is arranged in the pressure tapping pipe, and the driving device is connected with the cleaning mechanism. The cleaning mechanism is driven by the driving device to move, and the inner wall of the pressure tapping pipe is cleaned through movement of the cleaning mechanism. According to the self-cleaning pressure measuring system, the pressure taking pipe and the cleaning mechanism are arranged, so that the internal cleanness can be kept for a long time, the pressure measurement accuracy is ensured, the common problems of soot blowing and dust returning and shutdown disassembly and washing are solved, and the real online, automatic and secondary-pollution-free self-cleaning pressure measuring system is realized.

Description

Technical Field

[0001] The invention relates to a blockage-proof and self-flushing denitration pressure measuring instrument pressure-taking pipe structure. Background Art

[0002] In high-temperature combustion scenarios such as coal-fired power plants and waste incineration plants, to meet the country's strict control requirements for nitrogen oxide (NOx) emission concentrations, a selective catalytic reduction (SCR) system is often introduced into the flue gas treatment process. This system uses a reducing agent (such as ammonia or urea) to reduce NOx to harmless nitrogen and water under the action of a catalyst. In the SCR denitrification reaction area, real-time monitoring of the flue gas's dynamic pressure is required to ensure reaction efficiency, control the ammonia-nitrogen ratio, and avoid ammonia escape and system fouling. Accurate and stable pressure measurement not only determines the flue gas flow distribution, catalyst pressure drop changes, and flow blockage trends, but also directly affects the accuracy and response speed of the denitrification ammonia injection control system. However, due to the long-term presence of fly ash, crystallized salts, or other high-temperature corrosive particles in the flue gas, the pressure sampling pipe is prone to fouling and clogging, resulting in distorted pressure measurement data, delayed response, and even sensor failure. This poses a key risk to the stable operation of the denitrification system and its compliance with environmental standards. Traditional pressure-taking devices, which mostly rely on single-pulse purges or manual cleaning, suffer from incomplete cleaning, the need for maintenance downtime, and poor safety. These issues make them difficult to meet the urgent need for long-term, automated, and highly reliable pressure measurement in modern thermal power plants. Therefore, developing a pressure-taking structure that offers automatic periodic cleaning, prevents clogging and dust return, and maintains pressure accuracy is a key technical approach to improving the intelligence of SCR systems and ensuring environmentally compliant operation of power plants.

[0003] Traditional denitrification pressure-taking systems generally use one-way pulse blowing or rely on external exhaust devices to complete cleaning. They cannot effectively deal with the hard ash scale formed in high-temperature environments, causing dust to easily remain on the inner wall of the pressure-taking tube or be blown into the pressure gauge system for a second time, thereby causing inaccurate readings, delayed responses and other problems; at the same time, due to the lack of an effective sealing sliding structure, moving parts are often accompanied by the risk of leakage, wear and failure in high-temperature and high-pressure environments. The cleaning action and pressure measurement interfere with each other, and the cleaning process often requires interruption of operation or manual intervention, which not only increases maintenance costs, but also makes it difficult to ensure the continuity and accuracy of pressure measurement.

[0004] In addition, the existing technology has the following problems:

[0005] 1. Single purge method is prone to secondary dust emission, which affects subsequent processes. Ordinary pressure pipes mostly use one-way pulse purge; after being blown loose, the dust often returns directly to the main flue or remains in the pressure taking cavity, and may still enter the pressure gauge, causing reading drift.

[0006] 2. Gas impact alone cannot remove the hard ash sintered or adhered at high temperatures. It requires furnace shutdown and disassembly, manual mechanical scraping, a long maintenance window, and high labor intensity.

[0007] 3. Negative pressure vacuuming solutions generally rely on external vacuum pumps, which increases system complexity and energy consumption. Once the external exhaust fan fails, dust remains in the pressure pipe, causing failure.

[0008] In order to solve the above problems, the present invention is proposed. Summary of the Invention

[0009] The purpose of the present invention is to provide a pressure-taking pipe structure of a denitration pressure measuring instrument with anti-clogging and self-flushing properties.

[0010] The purpose of the present invention can be achieved through the following technical solutions:

[0011] A clogging-proof and self-flushing denitrification pressure measuring instrument pressure-taking pipe structure comprises a pipeline and a pressure-taking pipe obliquely arranged on the pipeline, a pressure gauge is arranged on the pressure-taking pipe, a driving device is arranged on the side of the pressure-taking pipe, a cleaning mechanism is arranged inside the pressure-taking pipe, the driving device is connected to the cleaning mechanism, the cleaning mechanism is driven to move by the driving device, and the inner wall of the pressure-taking pipe is cleaned by the movement of the cleaning mechanism.

[0012] Furthermore, it also includes a dust collecting device.

[0013] Furthermore, the pressure taking tube is provided with a pressure taking chamber, a deep cleaning air pressure chamber and an impurity collection air pressure chamber in sequence from one side of the pipeline to the other side, wherein the pressure gauge is located in one section of the pressure taking chamber, a first air intake one-way valve is provided on the side wall of the deep cleaning air pressure chamber, a second air intake one-way valve is provided on the impurity collection air pressure chamber, and a baffle is provided between the pressure taking chamber and the deep cleaning air pressure chamber.

[0014] Preferably, an air supply pipeline and a sealing assembly are also provided, and the two ends of the air supply pipeline are respectively connected to the inner wall cavity of the impurity collection air pressure chamber and the pressure taking chamber close to the side of the baffle, and the sealing assembly is arranged in the inner cavity of the pressure taking chamber on the baffle side.

[0015] Furthermore, the dust collecting device includes a dust collecting pipeline, one end of which is connected to the inner wall of the pressure taking chamber close to the baffle, facing the opposite side of the sealing assembly. An electric control valve is provided on the rear of the dust collecting pipeline, and the other end of the dust collecting pipeline is connected to a collection box.

[0016] Furthermore, the cleaning mechanism includes a cleaning head and a rod body that passes through the entire pressure-taking tube, the rod body includes a middle section and a tail end of the rod, the cleaning head is installed at one end of the middle section of the rod, the middle section of the rod is located in the deep cleaning air pressure chamber, and the tail end of the rod is located in the impurity collection air pressure chamber, and the deep cleaning air pressure chamber and the impurity collection air pressure chamber are separated by a movable sealing block fixed on the rod body.

[0017] Preferably, a deep cleaning air flow channel is also provided inside the middle section of the rod, the deep cleaning air flow channel is connected to the cleaning head, a one-way valve is provided in the deep cleaning air flow channel, the one-way valve allows the air flow to flow from the deep cleaning air pressure chamber to the pressure taking chamber; the deep cleaning air flow channel is connected to the deep cleaning air pressure chamber.

[0018] Furthermore, the sealing assembly includes a slide groove opened on the inner wall of the pressure taking chamber, and a self-resetting elastic sealing baffle capable of sliding in the slide groove is provided in the slide groove. The self-resetting elastic sealing baffle blocks the opening of the gas pipeline in the default state, and an abutment plate is provided on the outer wall of the self-resetting elastic sealing baffle. The cleaning head contacts the abutment plate, and the cleaning head pushes the abutment plate to drive the self-resetting elastic sealing baffle away from the gas pipeline.

[0019] Preferably, the cleaning head includes a cleaning disc, which is perpendicular to the inner wall of the pressure taking chamber. A cleaning scraper is provided on the outer wall of the cleaning disc. A circle of deep cleaning nozzles is provided on the outer side of the cleaning scraper in the cleaning disc, and the deep cleaning nozzles are all connected to the deep cleaning air flow channel.

[0020] Furthermore, an airflow dispersion block is provided on one side of the cleaning disc close to the sealing assembly.

[0021] Beneficial technical effects:

[0022] The present invention provides a pressure-taking tube and a cleaning mechanism, which can not only keep the interior clean for a long time and ensure accurate pressure measurement, but also avoid the common problems of "blowing dust back" and shutdown for disassembly and cleaning, thus realizing a truly online, automatic, and secondary pollution-free self-cleaning pressure measuring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the overall front structure of the present invention.

[0026] Figure 3 It is a schematic structural diagram of another state of the overall front of the present invention.

[0027] Figure 4 This is a cross-sectional view of the pressure-taking pipe and dust-collecting device of the present invention.

[0028] Figure 5 This is a three-dimensional diagram of the pressure-taking pipe and dust-collecting device of the present invention.

[0029] Figure 6 for Figure 5 A partial enlarged view of .

[0030] Figure 7 This is a three-dimensional view of the pressure-taking tube and the dust-collecting device of the present invention from another angle.

[0031] Figure 8 It is a schematic structural diagram of the cleaning mechanism of the present invention.

[0032] Markings in the figure: 10, pipeline; 20, pressure taking pipe; 30, pressure gauge; 40, driving device; 50, dust collecting device; 60, cleaning mechanism; 70, controller; 21, pressure taking chamber; 22, deep cleaning air pressure chamber; 221, first air inlet one-way valve; 23, impurity collection air pressure chamber; 231, second air inlet one-way valve; 24, baffle; 25, gas transmission pipeline; 26, sealing assembly; 51, impurity collection pipeline; 52, electric control valve; 53, collection box; 61, cleaning head; 62, rod middle section; 63, rod tail section; 64, deep cleaning air flow channel; 65, one-way valve; 66, movable sealing block; 261, slide groove; 262, self-resetting elastic sealing baffle; 263, abutment plate; 611, cleaning disc; 612, cleaning scraper; 613, deep cleaning nozzle; 614, air flow dispersion block. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] like Figure 1-8 As shown, a clogging-resistant, self-flushing denitrification pressure measuring instrument pressure pipe structure includes a pipe 10 and a pressure pipe 20 obliquely mounted on the pipe 10. The pressure pipe 20 is provided with a pressure gauge 30. A drive device 40 is provided on the side of the pressure pipe 20. A cleaning mechanism 60 is provided inside the pressure pipe 20. The drive device 40 is connected to the cleaning mechanism 60 and drives the cleaning mechanism 60 to move. The movement of the cleaning mechanism 60 cleans the inner wall of the pressure pipe 20. A dust collector 50 is also included. The purpose of the dust collector 50 is to collect dust and impurities produced by cleaning and scraping, so that the impurities can be collected outside the pipe 10.

[0035] The controller 70 is also included. The purpose of the controller 70 is to have a periodic control program built in to drive the dust collecting device 50 to open the entrance at the appropriate time and to synchronously control the driving device to generate cleaning power to drive the cleaning mechanism 60.

[0036] The pressure taking tube 20 is provided with a pressure taking chamber 21, a deep cleaning air pressure chamber 22 and an impurity collecting air pressure chamber 23 in sequence from one side of the pipeline 10 to the other side, wherein the pressure gauge 30 is located in a section of the pressure taking chamber 21, and a first air intake check valve 221 is provided on the side wall of the deep cleaning air pressure chamber 22, and a second air intake check valve 231 is provided on the impurity collecting air pressure chamber 23. A baffle 24 is provided between the pressure taking chamber 21 and the deep cleaning air pressure chamber 22 to separate them, and an air supply pipeline 25 and a sealing assembly 26 are also provided. The two ends of the air supply pipeline 25 are respectively connected to the inner wall cavity of the impurity collecting air pressure chamber 23 and the pressure taking chamber 21 close to the baffle 24, and the sealing assembly 26 is provided in the inner cavity of the pressure taking chamber 21 on the side of the baffle 24.

[0037] The dust collecting device 50 includes a dust collecting pipeline 51. One end of the dust collecting pipeline 51 is connected to the inner wall of the pressure taking chamber 21 on the side close to the baffle 24, opposite to the sealing assembly 26. An electric control valve 52 is provided on the rear of the dust collecting pipeline 51, which is controlled by the controller 70. The other end of the dust collecting pipeline 51 is connected to a collection box 53 for collecting scraped dust.

[0038] The cleaning mechanism 60 includes a cleaning head 61 and a rod body that passes through the entire pressure-taking tube 20. The rod body includes a rod middle section 62 and a rod tail end 63. The cleaning head 61 is installed at one end of the rod middle section 62. The rod middle section 62 is located in the deep cleaning air pressure chamber 22. The rod tail end 63 is located in the impurity collection air pressure chamber 23. The deep cleaning air pressure chamber 22 and the impurity collection air pressure chamber 23 are separated by a movable sealing block 66 fixed on the rod body. The movable sealing block 66 can move linearly in the overall inner cavity formed by the impurity collection air pressure chamber 23 and the deep cleaning air pressure chamber 22. A deep cleaning air flow channel 64 is also provided inside the rod middle section 62 located in the deep cleaning air pressure chamber 22. The deep cleaning air flow channel 64 is connected to the cleaning head 61. A one-way valve 65 is provided in the cleaning air flow channel 64, which allows the air flow to flow from the deep cleaning air pressure chamber 22 to the pressure taking chamber 21; the deep cleaning air flow channel 64 is connected to the deep cleaning air pressure chamber 22; the working process is: during the scraping action, the movable sealing block 66 moves toward the impurity collection air pressure chamber 23, and the first air inlet one-way valve 221 introduces gas from the outside of the equipment into the inside of the deep cleaning air pressure chamber 22. In the return journey, the air flow in the deep cleaning air pressure chamber 22 is compressed in the return journey of the movable sealing block 66 and enters the outer wall of the cleaning head 61 through the deep cleaning air flow channel 64 and is ejected, blowing a small amount of residual dust on the inner wall of the pressure taking pipe 20 after scraping away the pressure taking pipe 20 to avoid affecting the pressure gauge.

[0039] The cleaning head 61 in the cleaning mechanism 60 is normally extended completely out of the pressure-taking tube 20 , ensuring that the inner cavity of the pressure-taking tube 20 is connected with the inner cavity of the pipeline 10 , and ensuring that the pressure gauge reads correctly.

[0040] The purpose of the air supply line 25 is: when the cleaning head 61 completes the scraping action, the position will also reach the vicinity of the baffle 24, bringing the dust to the side of the baffle 24, and the cleaning head 61 will drive the sealing assembly 26 to open. The positive pressure gas in the impurity collection pressure chamber 23 that gradually accumulates with the scraping action will also be instantly released into the inner cavity between the cleaning head 61 and the baffle 24 through the air supply line 25. At the same time, the controller 70 controls the electric control valve 52 to open, and the collection box 53 is in a normal pressure state. The dust will enter the collection box 53 under the guidance and impact of the airflow. The sealing assembly 26 includes a slide groove 261 provided on the inner wall of the pressure taking chamber 21, and a self-resetting elastic sealing baffle 262 capable of sliding in the slide groove 261 is provided in the slide groove 261. The self-resetting elastic sealing baffle 262 blocks the opening of the gas transmission pipeline 25 in the default state, and an abutment plate 263 is provided on the outer wall of the self-resetting elastic sealing baffle 262. The purpose of the setting of the abutment plate 263 is to be able to accept the scraping action of the cleaning head 61 to the extreme position, and the cleaning head 61 contacts the abutment plate 263 to push The dynamic abutment plate drives the self-resetting elastic sealing baffle 262 away from the gas pipeline 25, so that the positive pressure gas accumulated in the impurity collection pressure chamber 23 can be opened through the gas pipeline 25, thereby instantly blowing all the scraped dust (located between the cleaning head 61 and the baffle 24) out of the pressure taking pipe 20 and into the dust collecting device 50; when the cleaning head 61 returns, the self-resetting elastic sealing baffle 262 automatically blocks the opening of the gas pipeline 25 again due to its own elastic reset ability.

[0041] The cleaning head 61 includes a cleaning disc 611, which is perpendicular to the inner wall of the pressure taking chamber 21. A cleaning scraper 612 is provided on the outer wall of the cleaning disc 611. A circle of deep cleaning nozzles 613 is provided on the outside of the cleaning scraper 612 (close to the pipeline direction) in the cleaning disc 611. The deep cleaning nozzles 613 are connected to the deep cleaning air flow channel 64. An air flow dispersion block 614 is provided on the side of the cleaning disc 611 close to the sealing assembly 26. The first function of the air flow dispersion block 614 is to move with the rod body and the cleaning head 61, and finally contact the abutment plate 263 to trigger the movement of the abutment plate 263 to open the air supply line 25. The second function is that the air flow dispersion block 614 is facing the opening of the air supply line 25, so that the instantaneous airflow can pass through the space between the cleaning disc 611 and the baffle 24 more evenly, thereby improving the large-area blowing effect of dust.

[0042] The following describes the decomposition workflow of this device:

[0043] ① Routine monitoring stage

[0044] After the device is powered on, the cleaning head 61 of the cleaning mechanism 60 is fully extended from the pressure-taking tube 20, maintaining a clear flow between the pressure-taking chamber 21 and the pipeline 10. The pressure gauge 30 reads the static pressure of the pipeline 10 in real time. The deep-cleaning pressure chamber 22 is separated from the impurity-collecting pressure chamber 23 by a movable seal 66. The first and second air inlet check valves 221 and 231 are both closed. The self-resetting elastic flap 262 of the sealing assembly 26 is attached to the port of the air supply pipeline 25, ensuring zero leakage in the pressure-taking link. The electrically controlled valve 52 in front of the dust collection pipeline 51 is also closed.

[0045] ②Cleaning cycle trigger

[0046] The controller 70 issues commands to the drive unit 40 based on a set pressure differential threshold or timing strategy, simultaneously presetting the electrically controlled valve 52. The drive unit 40 then propels the rod tail section 63, the rod midsection 62, and the cleaning head 61 forward at a constant speed from outside to inside. As soon as the cleaning disc 611 and cleaning blade 612 enter the pressure chamber 21, they begin mechanically scraping away dirt from the inner wall, pushing the scraped impurities toward the baffle 24.

[0047] ③ Propulsion stroke - scraping and positive pressure accumulation

[0048] As the cleaning head 61 moves forward, the movable sealing block 66 causes the deep cleaning air pressure chamber 22 to expand, creating a negative pressure. The first air inlet check valve 221 automatically opens, admitting outside air. Conversely, the impurity collection air pressure chamber 23 is compressed, and compressed air is continuously replenished through the second air inlet check valve 231, creating a significant positive pressure energy storage, preparing for the subsequent "instantaneous exhaust."

[0049] ④Limit position—instantaneous blowing and dust collection

[0050] When the cleaning head 61 reaches its limit, the airflow dispersion block 614 first contacts the abutment plate 263, pushing aside the self-resetting elastic sealing flap 262 and opening the air supply line 25. Simultaneously, the controller 70 opens the electrically controlled valve 52, restoring the pressure in the dust collection line 51 and the collection box 53 to normal. High-pressure gas accumulated in the impurity collection pressure chamber 23 is ejected along the air supply line 25 into the narrow cavity between the cleaning disc 611 and the baffle 24. This air, along with the scraped dust, is then drawn into the dust collection line 51 and deposited in the collection box 53, completing a "scrape-blow-collect" closed loop and preventing any dust from returning to the pipeline 10 or the pressure gauge 30.

[0051] ⑤Return trip—deep blowing and residual dust removal

[0052] The driving device 40 reverses and the cleaning head 61 begins to retreat. At this time, the deep cleaning air pressure chamber 22 is compressed, and at the same time, external air enters the impurity collection air pressure chamber 23 through the second air inlet check valve 231, preparing for the air flow impact required for the next impurity collection. The gas in the deep cleaning air pressure chamber 22 passes through the deep cleaning air flow channel 64 and the check valve 65 in the rod body, and is finally ejected in a direction by the multiple deep cleaning nozzles 613 on the outer ring of the cleaning disc 611, stripping away the remaining floating dust for a second time; the scraper 612 gently scrapes the pipe wall again; the self-resetting elastic sealing baffle 262 automatically resets and seals as the cleaning head 61 leaves, and the electric control valve 52 is also closed by the controller 70.

[0053] ⑥Reset and next cycle

[0054] After the cleaning head 61 completely exits the pressure-taking tube 20, the three internal chambers return to their initial volumes and pressures. The first and second air inlet check valves 221 and 231 reclose, and the pressure gauge 30 automatically resumes measurement and data output. The controller 70 records the number of cycles and the running time, and will restart the cleaning process when the next trigger condition is met. Maintenance personnel only need to regularly empty the ash collection box 53.

[0055] Through the above process, the pressure tube can not only maintain internal cleanliness for a long time and ensure accurate pressure measurement, but also avoid the common problems of "blowing dust back" and shutdown for disassembly and cleaning, realizing a truly online, automatic, and secondary pollution-free self-cleaning pressure measurement system.

[0056] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A self-flushing and anti-clogging denitrification pressure measuring instrument pressure pipe structure, characterized in that: It includes a pipeline and a pressure-taking tube obliquely arranged on the pipeline. A pressure gauge is provided on the pressure-taking tube. A driving device is provided on the side of the pressure-taking tube. A cleaning mechanism is provided inside the pressure-taking tube. The driving device is connected to the cleaning mechanism. The cleaning mechanism is driven to move by the driving device, and the inner wall of the pressure-taking tube is cleaned by the movement of the cleaning mechanism.

2. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 1 is characterized by: Also includes a dust collection device.

3. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 2 is characterized in that: The pressure taking pipe is provided with a pressure taking chamber, a deep cleaning air pressure chamber and an impurity collection air pressure chamber in sequence from one side of the pipeline to the other side, wherein the pressure gauge is located in one section of the pressure taking chamber, a first air intake one-way valve is provided on the side wall of the deep cleaning air pressure chamber, a second air intake one-way valve is provided on the impurity collection air pressure chamber, and a baffle is provided between the pressure taking chamber and the deep cleaning air pressure chamber.

4. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 3 is characterized by: An air supply pipeline and a sealing assembly are also provided. The two ends of the air supply pipeline are respectively connected to the inner wall cavity of the impurity collection air pressure chamber and the pressure taking chamber close to the side of the baffle. The sealing assembly is arranged in the inner cavity of the pressure taking chamber on the baffle side.

5. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 4 is characterized in that: The dust collecting device includes a dust collecting pipeline, one end of which is connected to the inner wall of the pressure taking chamber close to the baffle, facing the opposite side of the sealing assembly. An electric control valve is provided on the rear of the dust collecting pipeline, and the other end of the dust collecting pipeline is connected to a collection box.

6. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 1 is characterized in that: The cleaning mechanism includes a cleaning head and a rod body that runs through the entire pressure-taking tube. The rod body includes a middle section and a tail end of the rod. The cleaning head is installed at one end of the middle section of the rod. The middle section of the rod is located in the deep cleaning air pressure chamber. The tail end of the rod is located in the impurity collection air pressure chamber. The deep cleaning air pressure chamber and the impurity collection air pressure chamber are separated by a movable sealing block fixed on the rod body.

7. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 6, characterized in that: A deep cleaning air flow channel is also provided inside the middle section of the rod, which is connected to the cleaning head. A one-way valve is provided in the deep cleaning air flow channel, which allows air to flow from the deep cleaning air pressure chamber to the pressure taking chamber; the deep cleaning air flow channel is connected to the deep cleaning air pressure chamber.

8. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 6, characterized in that: The sealing assembly includes a slide groove opened on the inner wall of the pressure taking chamber, and a self-resetting elastic sealing baffle that can slide in the slide groove is provided in the slide groove. The self-resetting elastic sealing baffle blocks the opening of the gas pipeline in the default state, and an abutment plate is provided on the outer wall of the self-resetting elastic sealing baffle. The cleaning head contacts the abutment plate, and the cleaning head pushes the abutment plate to drive the self-resetting elastic sealing baffle away from the gas pipeline.

9. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 6, characterized in that: The cleaning head includes a cleaning disc, which is perpendicular to the inner wall of the pressure taking chamber. A cleaning scraper is provided on the outer wall of the cleaning disc. A circle of deep cleaning nozzles is provided on the outer side of the cleaning scraper in the cleaning disc. The deep cleaning nozzles are all connected to the deep cleaning air flow channel.

10. The anti-clogging and self-flushing denitrification pressure measuring instrument pressure pipe structure according to claim 9, characterized in that: An airflow dispersion block is provided on one side of the cleaning disc close to the sealing assembly.

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