A continuous dehumidification device for flue gas detection

Abstract

This invention belongs to the field of gas dehumidification technology, specifically referring to a continuous gas dehumidification device for flue gas detection. It includes a dehumidification feedback component, a gas supply regulation component, a pressure stabilization component, a spiral moisture absorption component, a spiral conveying component, and an air intake drive component. The dehumidification feedback component is located on the spiral moisture absorption component, the gas supply regulation component is located between the pressure stabilization component and the spiral moisture absorption component, the spiral moisture absorption component is located on the spiral conveying component, and the air intake drive component is located on the pressure stabilization component. This invention proposes a technical solution to regulate the speed of gas flow through the spiral moisture absorption filter element based on the moisture content of the discharged gas. Furthermore, this solution controls the gas pressure inside the pressure stabilizing cylinder through the gravity of the liquid in the water storage chamber, thereby maintaining a constant pressure during changes in the internal volume of the pressure stabilizing cylinder.

Description

Technical Field

[0001] This invention belongs to the field of gas dehumidification technology, specifically referring to a continuous gas dehumidification device for flue gas detection. Background Technology

[0002] "Flue gas detection" is mainly used to analyze the chemical components in flue gas. Therefore, moisture and solid particulate matter are interfering factors during component detection. It is necessary to absorb moisture and dehumidify the flue gas before it enters the detection chamber.

[0003] Generally speaking, although substances and moisture in flue gas will naturally mix and blend, the internal humidity of continuously supplied flue gas will inevitably change slowly, so the water content will fluctuate. Under the above conditions, technicians must maintain a high utilization rate of the filter element, control the water content of the dried gas within a certain range, and at the same time, avoid adding overly complex supporting structures.

[0004] In their paper "Research Progress and Prospect of Humidity-Response Actuators" published in the Journal of Composite Materials, Zheng Zongmin, He Tian, ​​Yang Zhen, and Li Zheng detailed a mechanism that can perform mechanical operations by controlling humidity. Its core principle is to complete actions such as movement and grasping by reversibly absorbing and losing water through hygroscopic materials.

[0005] The aforementioned material only absorbs and filters moisture and solid particles in the flue gas, and does not react with other gaseous components in the flue gas. Based on the above research, the inventors are committed to proposing a filter cartridge speed regulation scheme driven by the aforementioned moisture-absorbing material. Summary of the Invention

[0006] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a continuous gas dehumidification device for flue gas detection. To simultaneously solve the aforementioned problems, this invention proposes a technical solution that regulates the gas flow velocity through the spiral moisture-absorbing filter element based on the moisture content of the terminal gas. If the moisture content in the exhaust pipe is low, it indicates that the moisture content in the pressure-stabilizing cylinder is also low. In this case, the airflow velocity can be appropriately increased to improve drying efficiency and avoid incomplete utilization of the spiral moisture-absorbing filter element. Conversely, if the moisture content in the exhaust pipe is high, it indicates that the moisture content in the pressure-stabilizing cylinder is also high. In this case, the airflow velocity can be appropriately reduced to avoid incomplete dehumidification.

[0007] In addition, since the inlet flow rate of the pressure stabilizing cylinder is constant while the outlet flow rate changes, the actual storage capacity in the pressure stabilizing cylinder will change. If the internal pressure of the pressure stabilizing cylinder is not maintained, simply adjusting the height of the top rod will not be enough to control the gas flow rate in the gas supply pipeline. This solution controls the gas pressure in the pressure stabilizing cylinder by the gravity of the liquid in the water storage chamber, thereby maintaining a constant pressure during the change of the internal capacity of the pressure stabilizing cylinder.

[0008] The technical solution adopted by the present invention is as follows: The present invention proposes a continuous gas dehumidification device for flue gas detection, including a dehumidification feedback component, a gas supply regulation component, a pressure stabilization component, a spiral moisture absorption component, a spiral conveying component, and an air intake drive component. The dehumidification feedback component is disposed on the spiral moisture absorption component, the gas supply regulation component is disposed between the pressure stabilization component and the spiral moisture absorption component, the spiral moisture absorption component is disposed on the spiral conveying component, and the air intake drive component is disposed on the pressure stabilization component. With the rotation speed of the spiral moisture-absorbing component remaining constant, the speed of the gas passing through the filter slide can be flexibly adjusted to automatically match the speed parameters of the gas to be dried with different humidity levels, thereby keeping the moisture content of the discharged gas within a certain range; this can maximize the drying rate of the gas while maintaining high-efficiency utilization of the spiral moisture-absorbing filter element.

[0009] Preferably, the dehumidification feedback component includes an exhaust pipe, a sensor bracket, and a reversible moisture-absorbing material, wherein the sensor bracket is disposed in the exhaust pipe and the reversible moisture-absorbing material is disposed in the sensor bracket.

[0010] The reversible moisture-absorbing material is a polymer material that can expand when absorbing water and shrink when dehydrating.

[0011] When the moisture content of the environment in which the reversible moisture-absorbing material is located changes, its own moisture content will also change accordingly. This allows it to control the up-and-down sliding of the push rod through its own expansion and contraction, thereby regulating the air supply speed.

[0012] Furthermore, the gas supply regulating assembly includes a gas supply pipe, a push rod, and a return spring. The top end of the push rod is engaged and slidably disposed in the sensing bracket. The push rod is slidably disposed in the exhaust pipe. A valve plate is provided on the push rod. The valve plate is slidably disposed in the gas supply pipe. A crossbeam is also provided on the push rod. The return spring is disposed between the crossbeam and the gas supply pipe.

[0013] By allowing the top rod to float longitudinally, the internal gas flow rate of the gas supply pipeline can be automatically adjusted while maintaining a constant internal pressure in the pressure stabilizing cylinder, thereby achieving flow rate control when the gas flows through the filter slide.

[0014] Furthermore, the pressure stabilizing component includes a pressure stabilizing cylinder, a constant pressure piston, and a floating top cover. The air supply pipe is located on one side of the pressure stabilizing cylinder. The constant pressure piston is engaged and slidably disposed in the pressure stabilizing cylinder. A water storage chamber is provided on the constant pressure piston, and the floating top cover is slidably disposed in the water storage chamber.

[0015] The internal pressure of the pressure stabilizing cylinder is provided by the gravity of the liquid between the constant pressure piston and the floating top cover. Therefore, even if the internal capacity of the pressure stabilizing cylinder fluctuates, the internal air pressure can still be kept stable. In addition, according to production needs, the air pressure in the pressure stabilizing cylinder can be actively controlled by adjusting the amount of liquid in the water storage chamber.

[0016] In addition to stabilizing air pressure when the flow rate of the dehumidification mechanism changes, the pressure stabilizing cylinder can also neutralize the gas entering the pressure stabilizing cylinder; even if the moisture content of the gas entering the pressure stabilizing cylinder fluctuates greatly, the moisture content of the gas discharged from the pressure stabilizing cylinder will only change slowly.

[0017] Preferably, the floating top cover is connected to an external water supply mechanism via a connector, and the gas pressure in the pressure stabilizing cylinder can be controlled by the amount of water stored in the water storage chamber.

[0018] Furthermore, the spiral moisture-absorbing assembly includes a spiral moisture-absorbing filter element and a filter chute. The spiral moisture-absorbing filter element is provided with an inner sleeve, which is slidably disposed on the spiral conveying assembly. The filter chute is symmetrically provided with joints, which are disposed between the exhaust pipe and the air supply pipe through the joints. The spiral moisture-absorbing filter element is slidably disposed in the filter chute.

[0019] The spiral conveyor assembly can rotate and move the spiral moisture-absorbing filter element laterally when it rotates, which can greatly extend the replacement cycle and reduce the efficiency loss caused by filter element replacement compared with the annular filter element.

[0020] Furthermore, the screw conveyor assembly includes a rotating bracket, a bearing, and a transmission rod, wherein the bearing is disposed in the rotating bracket and the transmission rod is disposed in the bearing.

[0021] Preferably, the transmission rod is provided with a sliding boss, and the inner sleeve is provided with a sliding groove that cooperates with the sliding boss. The inner sleeve is engaged and slidably disposed on the transmission rod.

[0022] Furthermore, the air intake drive assembly includes a pneumatic motor and a synchronous belt. The pneumatic motor is equipped with an output shaft. During the process of gas entering the pressure stabilizing cylinder through the pneumatic motor, the output shaft can be driven to rotate. The output shaft and the transmission rod are connected by a synchronous belt.

[0023] The beneficial effects achieved by the present invention using the above structure are as follows: (1) Under the premise that the rotation speed of the spiral moisture absorption component is constant, by flexibly adjusting the speed of the gas passing through the filter slide, the speed parameters of the gas to be dried with different humidity can be automatically matched, so that the moisture content of the discharged gas is kept within a certain range; it can maximize the drying rate of the gas and maintain the high-efficiency utilization of the spiral moisture absorption filter element.

[0024] (2) When the moisture content of the environment in which the reversible hygroscopic material is located changes, its own moisture content will also change accordingly. Thus, by controlling the sliding of the top rod through its own expansion and contraction, the gas supply speed can be adjusted.

[0025] (3) By the longitudinal floating of the top rod, the internal gas flow rate of the gas supply pipeline can be automatically adjusted under the condition that the internal pressure of the pressure stabilizing cylinder is constant, thereby realizing the flow rate control of the gas flowing through the filter slide.

[0026] (4) The internal pressure of the pressure stabilizing cylinder is provided by the gravity of the liquid between the constant pressure piston and the floating top cover. Therefore, even if the internal capacity of the pressure stabilizing cylinder fluctuates, the internal air pressure can still be kept stable. In addition, according to production needs, the air pressure in the pressure stabilizing cylinder can be actively controlled by adjusting the amount of liquid in the water storage chamber.

[0027] (5) In addition to stabilizing the air pressure when the flow rate of the dehumidification mechanism changes, the pressure stabilizing cylinder can also neutralize the gas entering the pressure stabilizing cylinder; even if the water content of the gas entering the pressure stabilizing cylinder fluctuates greatly, the water content of the gas discharged from the pressure stabilizing cylinder will only change slowly.

[0028] (6) When the spiral conveyor assembly rotates, it can carry the spiral moisture-absorbing filter element to rotate and move laterally. Compared with the annular filter element, it can greatly extend the replacement cycle and reduce the efficiency loss caused by filter element replacement.

[0029] (7) The spiral moisture-absorbing filter element can extend the filter element replacement cycle through the continuous movement of the spiral structure; and after absorbing moisture in the flue gas, the moist filter element can also filter solid particles in the flue gas, eliminating the interference of moisture and particles on the subsequent instrument analysis of flue gas components. Attached Figure Description

[0030] Figure 1 This is a perspective view of a continuous dehumidification device for flue gas detection proposed in this invention. Figure 2 This is a front view of a continuous gas dehumidification device for flue gas detection proposed in this invention. Figure 3 This is a left view of a continuous dehumidification device for flue gas detection proposed in this invention. Figure 4 This is a top view of a continuous gas dehumidification device for flue gas detection proposed in this invention; Figure 5 for Figure 3 A cross-sectional view along section line AA; Figure 6 for Figure 2 A cross-sectional view along the cutting line BB; Figure 7 for Figure 3 A cross-sectional view along the section line CC; Figure 8 for Figure 5 A magnified view of a section at point I; Figure 9 for Figure 6 A magnified view of a section at point II.

[0031] The components include: 1. Dehumidification feedback component; 2. Air supply regulation component; 3. Pressure stabilization component; 4. Spiral moisture absorption component; 5. Spiral conveying component; 6. Air intake drive component; 11. Exhaust pipe; 12. Induction bracket; 13. Reversible moisture absorption material; 21. Air supply pipe; 22. Top rod; 23. Return spring; 31. Pressure stabilizing cylinder; 32. Constant pressure piston; 33. Floating top cover; 41. Spiral moisture absorption filter element; 42. Filter slide; 51. Rotating bracket; 52. Bearing; 53. Transmission rod; 61. Pneumatic motor; 62. Synchronous belt; 221. Crossbeam; 222. Valve plate; 321. Water storage chamber; 411. Inner sleeve; 412. Slide section; 421. Connector section; 531. Sliding boss section; 611. Output shaft.

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] like Figures 1-9As shown, the present invention proposes a continuous gas dehumidification device for flue gas detection, including a dehumidification feedback component 1, a gas supply regulation component 2, a pressure stabilization component 3, a spiral moisture absorption component 4, a spiral conveying component 5, and an air intake drive component 6. The dehumidification feedback component 1 is disposed on the spiral moisture absorption component 4, the gas supply regulation component 2 is disposed between the pressure stabilization component 3 and the spiral moisture absorption component 4, the spiral moisture absorption component 4 is disposed on the spiral conveying component 5, and the air intake drive component 6 is disposed on the pressure stabilization component 3. Under the premise that the rotation speed of the spiral moisture absorption component 4 is constant, the speed of the gas passing through the filter slide 42 can be flexibly adjusted to automatically match the speed parameters of the gas to be dried with different humidity, so that the moisture content of the discharged gas is kept within a certain range; this can maximize the drying rate of the gas and maintain the high-efficiency utilization of the spiral moisture absorption filter element 41.

[0036] The dehumidification feedback component 1 includes an exhaust pipe 11, a sensor bracket 12, and a reversible moisture-absorbing material 13. The sensor bracket 12 is disposed in the exhaust pipe 11, and the reversible moisture-absorbing material 13 is disposed in the sensor bracket 12.

[0037] The reversible moisture-absorbing material 13 is made of polymer, which can expand when absorbing water and shrink when dehydrating.

[0038] When the moisture content of the environment in which the reversible moisture-absorbing material 13 is located changes, its own moisture content will also change accordingly. Thus, by expanding and contracting itself, it controls the sliding of the top rod 22 up and down, thereby adjusting the air supply speed.

[0039] The gas supply regulating component 2 includes a gas supply pipe 21, a push rod 22, and a return spring 23. The top end of the push rod 22 is engaged and slidably disposed in the sensing bracket 12. The push rod 22 is slidably disposed in the exhaust pipe 11. A valve plate 222 is provided on the push rod 22. The valve plate 222 is slidably disposed in the gas supply pipe 21. A crossbeam 221 is also provided on the push rod 22. The return spring 23 is disposed between the crossbeam 221 and the gas supply pipe 21.

[0040] By the longitudinal floating of the top rod 22, the internal gas flow rate of the gas supply pipe 21 can be automatically adjusted under the condition that the internal pressure of the pressure stabilizing cylinder 31 is constant, thereby realizing the flow rate control of the gas flowing through the filter slide 42.

[0041] The pressure stabilizing component 3 includes a pressure stabilizing cylinder 31, a constant pressure piston 32, and a floating top cover 33. The gas supply pipe 21 is located on one side of the pressure stabilizing cylinder 31. The constant pressure piston 32 is engaged and slidably disposed in the pressure stabilizing cylinder 31. A water storage chamber 321 is provided on the constant pressure piston 32. The floating top cover 33 is slidably disposed in the water storage chamber 321.

[0042] The internal pressure of the pressure stabilizing cylinder 31 is provided by the gravity of the liquid between the constant pressure piston 32 and the floating top cover 33. Therefore, even if the internal capacity of the pressure stabilizing cylinder 31 fluctuates, the internal air pressure can still be kept stable. In addition, according to production needs, the air pressure in the pressure stabilizing cylinder 31 can be actively controlled by adjusting the amount of liquid in the water storage chamber 321.

[0043] In addition to stabilizing the air pressure when the flow rate of the dehumidification mechanism changes, the pressure stabilizing cylinder 31 can also neutralize the gas entering the pressure stabilizing cylinder 31; even if the moisture content of the gas entering the pressure stabilizing cylinder 31 fluctuates greatly, the moisture content of the gas discharged from the pressure stabilizing cylinder 31 will only change slowly.

[0044] The floating top cover 33 is connected to an external water supply mechanism via a connector, and the gas pressure in the pressure stabilizing cylinder 31 can be controlled by the amount of water stored in the water storage chamber 321.

[0045] The spiral moisture-absorbing assembly 4 includes a spiral moisture-absorbing filter element 41 and a filter slide 42. The spiral moisture-absorbing filter element 41 is provided with an inner sleeve 411, which is slidably disposed on the spiral conveying assembly 5. The filter slide 42 is symmetrically provided with a connector 421, which is disposed between the exhaust pipe 11 and the air supply pipe 21 through the connector 421. The spiral moisture-absorbing filter element 41 is slidably disposed in the filter slide 42.

[0046] When the spiral conveyor assembly 5 rotates, it can carry the spiral moisture-absorbing filter element 41 to rotate and move laterally. Compared with the annular filter element, it can greatly extend the replacement cycle and reduce the efficiency loss caused by filter element replacement.

[0047] The screw conveyor assembly 5 includes a rotating bracket 51, a bearing 52, and a transmission rod 53. The bearing 52 is located in the rotating bracket 51, and the transmission rod 53 is located in the bearing 52.

[0048] The transmission rod 53 is provided with a sliding boss 531, and the inner sleeve 411 is provided with a sliding groove 412 that cooperates with the sliding boss 531. The inner sleeve 411 is engaged and slidably disposed on the transmission rod 53.

[0049] The air intake drive assembly 6 includes a pneumatic motor 61 and a synchronous belt 62. The pneumatic motor 61 is equipped with an output shaft 611. During the process of gas entering the pressure stabilizing cylinder 31 through the pneumatic motor 61, the output shaft 611 can be driven to rotate. The output shaft 611 and the transmission rod 53 are connected by the synchronous belt 62.

[0050] In practical use, the flue gas to be tested generated in the front-end process is connected to the input end of the pneumatic motor 61 through a pipe. When it flows through the inside of the pneumatic motor 61, it drives the output shaft 611 to rotate. Then, it enters the pressure stabilizing cylinder 31 through the output end of the pneumatic motor 61. The gas in the pressure stabilizing cylinder 31 enters the filter slide 42 through the gas supply pipe 21. When the gas flows through the spiral moisture-absorbing filter element 41, the moisture inside is absorbed by the spiral moisture-absorbing filter element 41. Generally speaking, the lower the humidity of the spiral moisture-absorbing filter element 41 itself and the higher the water content of the gas, the higher the efficiency of moisture absorption; the slower the gas flows through the spiral moisture-absorbing filter element 41, the more thorough the moisture absorption.

[0051] After being dried by the spiral moisture-absorbing filter element 41, the gas is discharged through the exhaust pipe 11, and the particulate matter in the flue gas is also filtered out. The reversible moisture-absorbing material 13 is a polymer material that can expand when absorbing water and shrink when dehydrating. Specifically, it can be cross-linked polyacrylamide or other materials. Different materials have different service lives. According to its service life, an appropriate replacement cycle can be set. The replacement frequency of the reversible moisture-absorbing material 13 is much less than that of the spiral moisture-absorbing filter element 41, so it will not affect the production efficiency.

[0052] If the moisture content of the gas in the exhaust pipe 11 increases, it means that the moisture content of the gas in the pressure stabilizing cylinder 31 has also increased. The gas will not be able to achieve the expected dehumidification effect when it passes through the spiral moisture-absorbing filter element 41 at the original flow rate. At this time, the reversible moisture-absorbing material 13 expands due to water absorption, which will push the top rod 22 down. The portion of the valve plate 222 extending into the air supply pipe 21 increases, thereby reducing the flow area. Under the condition that the pressure in the pressure stabilizing cylinder 31 is constant, the gas flow rate in the air supply pipe 21 can be reduced, thereby reducing the speed of the gas flowing through the spiral moisture-absorbing filter element 41 and achieving a more thorough moisture absorption effect.

[0053] If the moisture content of the gas in the exhaust pipe 11 decreases, it means that the moisture content of the gas in the pressure stabilizing cylinder 31 has decreased. The gas passes through the spiral moisture-absorbing filter element 41 at the original flow rate. At this time, not only is there room for improvement in dehumidification efficiency, but the utilization rate of the spiral moisture-absorbing filter element 41 has not reached its limit. At this time, the reversible moisture-absorbing material 13 shrinks due to dehydration, and the return spring 23 pushes the top rod 22 to rise. The part of the valve plate 222 extending into the air supply pipe 21 is reduced, thereby increasing the flow area. Under the condition that the pressure in the pressure stabilizing cylinder 31 is constant, the gas flow rate in the air supply pipe 21 can be increased, thereby increasing the speed of the gas flowing through the spiral moisture-absorbing filter element 41, and realizing a dual improvement in the utilization rate and dehumidification efficiency of the spiral moisture-absorbing filter element 41.

[0054] The internal pressure of the pressure stabilizing cylinder 31 is provided by the gravity of the liquid between the constant pressure piston 32 and the floating top cover 33. Therefore, even if the internal capacity of the pressure stabilizing cylinder 31 fluctuates, the internal air pressure can still be kept stable. In addition, according to production needs, the air pressure in the pressure stabilizing cylinder 31 can be actively controlled by adjusting the amount of liquid in the water storage chamber 321.

[0055] In addition, when the output shaft 611 rotates, it can drive the transmission rod 53 to rotate via the synchronous belt 62, thereby driving the spiral moisture-absorbing filter element 41 to rotate slowly. When the spiral moisture-absorbing filter element 41 rotates, it will move laterally relative to the transmission rod 53, thereby realizing the feeding of the spiral moisture-absorbing filter element 41. Compared with the annular filter element, the spiral moisture-absorbing filter element 41 can greatly extend the replacement cycle and reduce the efficiency loss caused by filter element replacement.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A continuous dehumidification device for flue gas detection, characterized in that: It includes a dehumidification feedback component (1), an air supply regulation component (2), a pressure stabilization component (3), a spiral moisture absorption component (4), a spiral conveying component (5), and an air intake drive component (6). The dehumidification feedback component (1) is located on the spiral moisture absorption component (4), the air supply regulation component (2) is located between the pressure stabilization component (3) and the spiral moisture absorption component (4), the spiral moisture absorption component (4) is located on the spiral conveying component (5), and the air intake drive component (6) is located on the pressure stabilization component (3). The dehumidification feedback component (1) includes an exhaust pipe (11), a sensor bracket (12), and a reversible moisture-absorbing material (13). The sensor bracket (12) is disposed in the exhaust pipe (11), and the reversible moisture-absorbing material (13) is disposed in the sensor bracket (12). The reversible moisture-absorbing material (13) is a polymer material that can expand when absorbing water and shrink when dehydrating. The gas supply regulating component (2) includes a gas supply pipe (21), a push rod (22) and a return spring (23). The top end of the push rod (22) is engaged and slidably disposed in the sensing bracket (12). The push rod (22) is slidably disposed in the exhaust pipe (11). A valve plate (222) is provided on the push rod (22). The valve plate (222) is slidably disposed in the gas supply pipe (21). A crossbeam (221) is also provided on the push rod (22). The return spring (23) is disposed between the crossbeam (221) and the gas supply pipe (21). The pressure stabilizing component (3) includes a pressure stabilizing cylinder (31), a constant pressure piston (32), and a floating top cover (33). The gas supply pipe (21) is located on one side of the pressure stabilizing cylinder (31). The constant pressure piston (32) is engaged and slidably disposed in the pressure stabilizing cylinder (31). A water storage chamber (321) is provided on the constant pressure piston (32). The floating top cover (33) is slidably disposed in the water storage chamber (321). The floating top cover (33) is connected to an external water supply mechanism through a connector, and the gas pressure in the pressure stabilizing cylinder (31) can be controlled by the amount of water stored in the water storage chamber (321); The spiral moisture-absorbing assembly (4) includes a spiral moisture-absorbing filter element (41) and a filter slide (42). The spiral moisture-absorbing filter element (41) is provided with an inner sleeve (411), which is slidably disposed on the spiral conveying assembly (5). The filter slide (42) is symmetrically provided with a connector (421), which is disposed between the exhaust pipe (11) and the air supply pipe (21) through the connector (421). The spiral moisture-absorbing filter element (41) is slidably disposed in the filter slide (42). The spiral conveying assembly (5) includes a rotating bracket (51), a bearing (52) and a transmission rod (53). The bearing (52) is located in the rotating bracket (51), and the transmission rod (53) is located in the bearing (52). The transmission rod (53) is provided with a sliding boss (531), and the inner sleeve (411) is provided with a sliding groove (412) that cooperates with the sliding boss (531). The inner sleeve (411) is engaged and slidably disposed on the transmission rod (53). The air intake drive assembly (6) includes a pneumatic motor (61) and a synchronous belt (62). The pneumatic motor (61) is provided with an output shaft (611). During the process of gas entering the pressure stabilizing cylinder (31) through the pneumatic motor (61), the output shaft (611) can be driven to rotate. The output shaft (611) and the transmission rod (53) are connected by the synchronous belt (62). The flue gas to be tested generated in the front-end process is connected to the input end of the pneumatic motor (61) through a pipe. When it flows through the inside of the pneumatic motor (61), it will drive the output shaft (611) to rotate. Then it enters the pressure stabilizing cylinder (31) through the output end of the pneumatic motor (61). The gas in the pressure stabilizing cylinder (31) enters the filter slide (42) through the gas supply pipe (21). When the gas flows through the spiral moisture-absorbing filter element (41), the moisture inside will be absorbed by the spiral moisture-absorbing filter element (41). After being dried by the spiral moisture-absorbing filter element (41), the gas is discharged through the exhaust pipe (11), and the particulate matter in the flue gas is also filtered out. If the moisture content of the gas in the exhaust pipe (11) increases, the reversible moisture-absorbing material (13) will expand due to water absorption, which will push the top rod (22) down. The part of the valve plate (222) extending into the gas supply pipe (21) will increase, thereby reducing the flow area. Under the condition that the pressure in the pressure stabilizing cylinder (31) is constant, the gas flow rate in the gas supply pipe (21) can be reduced, thereby reducing the speed of the gas flowing through the spiral moisture-absorbing filter element (41). If the moisture content of the gas in the exhaust pipe (11) decreases, the reversible moisture-absorbing material (13) shrinks due to dehydration, and the return spring (23) will push the top rod (22) to rise. The part of the valve plate (222) extending into the gas supply pipe (21) will decrease, thereby increasing the flow area. Under the condition that the pressure in the pressure stabilizing cylinder (31) is constant, the gas flow rate in the gas supply pipe (21) can be increased, thereby increasing the speed of the gas flowing through the spiral moisture-absorbing filter element (41). The internal pressure of the pressure stabilizing cylinder (31) is provided by the liquid gravity between the constant pressure piston (32) and the floating top cover (33). When the output shaft (611) rotates, it can drive the transmission rod (53) to rotate through the synchronous belt (62), thereby driving the spiral moisture-absorbing filter element (41) to rotate slowly. When the spiral moisture-absorbing filter element (41) rotates, it will move laterally relative to the transmission rod (53), thereby realizing the feeding of the spiral moisture-absorbing filter element (41).

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