Device for detecting emission pressure and concentration of purified biomass boiler flue gas

Abstract

The invention discloses an emission pressure and concentration detection device after biomass boiler flue gas purification treatment, and belongs to the technical field of flue gas purification detection, the emission pressure and concentration detection device comprises two identical fixing pieces, the fixing pieces are movably connected with connecting pieces, and the connecting pieces are provided with detection pieces; the fixing piece comprises a mounting block, an inserting groove and a containing groove are formed in the mounting block, a rotating shaft is arranged in the containing groove, a rotating plate is rotationally connected to the rotating shaft, a sliding groove is further formed in the portion, in the inserting groove, of the mounting block, the rotating plate is matched with the sliding groove, and a mounting groove is further formed in one surface of the mounting block. By arranging the fixing piece and the connecting piece, when the device is used, the rotating plate is rotated firstly, at the moment, the mounting block is inserted into a pipe orifice rod piece of the smoke exhaust pipeline, after the rod piece is inserted into the inserting groove, the rotating plate is rotated reversely till the inserting groove is closed by the rotating plate through the sliding groove, and the device can be conveniently clamped on a similar rod body through the mounting block; installation and disassembly are very convenient, the detection piece extends into the smoke exhaust pipe, and the detection result is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas purification detection, and in particular to a device for detecting the emission pressure and concentration of flue gas from a biomass boiler after purification treatment. Background Art

[0002] With the transformation of the global energy structure and the enhancement of environmental protection awareness, biomass energy, as a renewable energy source, has been given more and more attention for its development and utilization. Biomass boilers, as a device that converts biomass energy into thermal energy, have been widely used in industrial production and heating systems. However, biomass boilers will produce a large amount of flue gas during the combustion process. These flue gases contain a variety of harmful substances, such as particulate matter, sulfur oxides, nitrogen oxides, etc. If they are directly discharged without effective treatment, they will cause serious harm to the environment and human health. At present, the flue gas treatment technology of biomass boilers mainly includes dust removal, desulfurization and denitrification processes. These processes can effectively remove most of the harmful substances in the flue gas, but whether the treated flue gas meets the emission standards needs to be determined through precise testing.

[0003] The Chinese patent publication number "CN114383987A" discloses "a device for detecting the discharge pressure and concentration of flue gas from boiler combustion after purification treatment". The patent discloses that "the detection device includes a fixed rod, on which a flue gas concentration sensor is installed, and both ends of the fixed rod are fixed by a fixing mechanism. A rotating seat is arranged on the outer side of the flue gas concentration sensor, and a plurality of flue gas pressure sensors are arranged on the rotating seat. Rotating fixed rings are rotatably installed at both ends of the fixed rod through bearings, and the rotating fixed ring is connected to the rotating seat by a connecting rod. The flue gas concentration sensor and the flue gas pressure sensor can be used to detect the concentration and pressure of the flue gas discharged from the boiler after purification to avoid excessive emission of toxic and harmful gases affecting the atmospheric environment. The design of the rotating seat can protect the flue gas concentration sensor and the flue gas pressure sensor to avoid being in a high temperature environment for a long time and affecting the service life". The above technical scheme can detect the concentration and pressure of the discharged flue gas, and avoid being in a high temperature environment for a long time and affecting the service life of the air pressure sensor.

[0004] However, the detection device of the prior art is fixedly installed at the pipe mouth of the smoke exhaust pipe after replacing the rod body of the smoke exhaust pipe, which is inconvenient to install. After installation, if the detection device needs to be replaced and maintained, it is difficult to remove the detection device. In addition, the installation position of the detection device of the prior art is outside the pipe mouth of the smoke exhaust pipe, and part of the smoke will be scattered into the air, resulting in insufficient measurement accuracy.

[0005] Therefore, we proposed an emission pressure and concentration detection device after biomass boiler flue gas purification treatment in order to solve the above problems.

[0006] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention and therefore, it may include information that does not constitute the prior art known to a person of ordinary skill in the art. Summary of the invention

[0007] The purpose of the present invention is to provide a device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification, so as to solve the problems of inconvenient assembly and disassembly and insufficient detection accuracy proposed by the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides an emission pressure and concentration detection device after biomass boiler flue gas purification treatment, including two identical fixing parts, the fixing parts are movably connected with a connecting part, and a detection part is installed on the connecting part; the fixing part includes a mounting block, a slot and a receiving groove are provided on the mounting block, a rotating shaft is provided in the receiving groove, a rotating plate is rotatably connected to the rotating shaft, the mounting block is also provided with a sliding groove in the slot, the rotating plate is adapted to the sliding groove, and a mounting groove is also provided on one surface of the mounting block; the connecting part includes a connecting shaft, both ends of the connecting shaft are fixedly connected with fixed rods, the fixed rod is slidably connected with a movable rod, and the top of the movable rod is adapted to the mounting groove.

[0009] Preferably, a main air pressure chamber is provided inside the fixed rod, and the movable rod is slidably connected to the main air pressure chamber.

[0010] Preferably, a secondary air pressure chamber is provided inside the movable rod, and the secondary air pressure chamber is communicated with the main air pressure chamber.

[0011] Preferably, a sleeve is provided in the secondary air pressure chamber, a pressure chamber is provided on the peripheral side of the sleeve, a piston rod is movably connected in the sleeve, and the pressure chamber and the secondary air pressure chamber are isolated from each other.

[0012] Preferably, connecting holes are provided on both sides of the movable rod, and the mounting block is also provided with connecting holes at positions corresponding to the movable rod, and the connecting holes are adapted to the piston rod.

[0013] Preferably, the detection member comprises a fixed cylinder arranged on the connecting shaft, a mounting cylinder is provided at the center of the fixed cylinder, a concentration sensor is installed in the mounting cylinder, and the mounting cylinder passes through the connecting shaft and the fixed cylinder.

[0014] Preferably, limiting rings are provided on both side surfaces of the fixed cylinder, the limiting rings are rotatably connected to connecting rings, the connecting rings are fixedly connected to the movable cylinder, and the movable cylinder is rotatably matched with the connecting shaft.

[0015] Preferably, a plurality of air pressure sensors are fixedly mounted on the circumferential side of the movable cylinder, and the air pressure sensors are arranged in an array.

[0016] Preferably, a plurality of fan blades are fixedly mounted on the peripheral side of the movable cylinder, and the fan blades are arc-shaped plate structures. Two movable cylinders are symmetrically arranged with respect to the fixed cylinder.

[0017] Preferably, the fixing piece is installed at the top of the smoke exhaust pipe, a cover is installed on the upper surface of the smoke exhaust pipe through a vertical pole, and a slot of the fixing piece is matched with the vertical pole.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention is provided with a fixing member and a connecting member, through the mounting block of the fixing member and the movable rod of the connecting member, when in use, the rotating plate is first rotated to store the rotating plate in the accommodating groove, and the mounting block is inserted into the pipe mouth rod of the smoke exhaust pipe. When the rod is inserted into the slot, the rotating plate is rotated in the opposite direction to make the rotating plate close the slot outward. Even if the rod blocks the path of part of the rotating plate, due to the hinge of the rotating plate, the rotating plate can be folded and shortened in length to allow it to pass smoothly until the rotating plate closes the slot through the sliding slot, and the mounting block can be fixed. Subsequently, the movable rods at both ends of the connecting member are inserted into the mounting grooves in turn, and the detection member can be installed inside the pipe mouth. The mounting block can be used to conveniently clamp the device on a similar rod body, and installation and disassembly are very convenient. Moreover, by using the L-shaped mounting block, the detection member is extended into the interior of the smoke exhaust pipe, which can prevent air from mixing into the detection position, and the detection result is more accurate.

[0020] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure of the fixing member of the present invention;

[0023] Figure 3 is a schematic cross-sectional structure diagram of a fixing member of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the connecting member and the detecting member of the present invention;

[0025] Figure 5 It is a cross-sectional schematic diagram of the connecting member and the detecting member of the present invention;

[0026] Figure 6 is a schematic diagram of the cross-sectional structure of the detection element of the present invention;

[0027] Figure 7It is a schematic diagram of the cross-sectional structure of the fixing cylinder of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the present invention installed on a smoke exhaust pipe.

[0029] In the figure: 1. fixing part; 11. mounting block; 12. slot; 13. receiving slot; 14. sliding slot; 15. rotating shaft; 16. rotating plate; 17. mounting slot; 2. connecting part; 21. connecting shaft; 22. fixing rod; 23. movable rod; 24. main air pressure chamber; 25. auxiliary air pressure chamber; 26. sleeve; 27. pressure chamber; 28. piston rod; 29. ​​connecting hole; 3. detecting part; 31. fixing cylinder; 32. mounting cylinder; 33. concentration sensor; 34. limiting ring; 35. connecting ring; 36. movable cylinder; 37. air pressure sensor; 39. fan blade; 4. exhaust pipe; 5. cover hood. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. It should be pointed out that the drawings are schematic and not drawn to scale. For the sake of clarity and convenience in the figures, the relative sizes and proportions of the parts shown in the figures are exaggerated or reduced in size, and any size is only exemplary and not restrictive.

[0031] Embodiment 1

[0032] See also Figure 1-Figure 5 , the emission pressure and concentration detection device of biomass boiler flue gas after purification treatment, including:

[0033] Two identical fixing members 1, the fixing member 1 is movably connected with the connecting member 2, and the connecting member 2 is equipped with a detection member 3; the fixing member 1 includes a mounting block 11, the mounting block 11 is provided with a slot 12 and a receiving slot 13, a rotating shaft 15 is arranged in the receiving slot 13, a rotating plate 16 is rotatably connected to the rotating shaft 15, the mounting block 11 is also provided with a sliding slot 14 in the slot 12, the rotating plate 16 is adapted to the sliding slot 14, and a mounting slot 17 is also provided on one surface of the mounting block 11; the connecting member 2 includes a connecting shaft 21, both ends of the connecting shaft 21 are fixedly connected with a fixing rod 22, the fixing rod 22 is slidably connected with a movable rod 23, and the top of the movable rod 23 is adapted to the mounting slot 17.

[0034] The fixing member 1 is used to install and fix the device at the smoke exhaust port such as the smoke exhaust pipe 4, and the connecting member 2 is connected and fixed to the fixing member 1. The connecting member 2 is used to install the detection member 3, and the detection member 3 is used to detect the discharge pressure and concentration of the boiler flue gas after purification;

[0035] Among them, the mounting block 11 is an L-shaped block, the long end of which is inserted into the interior of the smoke exhaust pipe 4, the slot 12 of the mounting block 11 is inserted into other devices, the rotating plate 16 rotates around the rotating shaft 15, and the slot 12 can be opened and closed by rotating the rotating plate 16. The rotating plate 16 is divided into two parts in the middle, and the two parts are connected by a hinge that can only rotate 180°, which can realize one-way rotation, so that the rotating plate 16 can be folded to make room for a part of the space, and it will not be folded after the slot 12 is closed. By setting the sliding groove 14, the size of the sliding groove 14 is adapted to the rotation path of the rotating plate 16, which is used for the rotating plate 16 to rotate, and the mounting groove 17 is used for the insertion of the movable rod 23. Since fixed rods 22 are provided at both ends of the connecting shaft 21, the two movable rods 23 are respectively inserted into the two mounting grooves 17, thereby completing the fixation, and the movable rod 23 can extend along the fixed rod 22, and the movable rod 23 is pushed outward by air pressure or spring, so that it is pressed tightly against the mounting groove 17 of the mounting block 11.

[0036] Operation process: When in use, first rotate the rotating plate 16 and store the rotating plate 16 in the accommodating groove 13. At this time, insert the mounting block 11 on the pipe mouth rod of the smoke exhaust pipe 4. When the rod is inserted into the slot 12, rotate the rotating plate 16 in the opposite direction to make the rotating plate 16 close the slot 12 outward. Even if the rod blocks part of the path of the rotating plate 16, due to the hinge of the rotating plate 16, the rotating plate 16 can be folded and shortened to allow it to pass smoothly until the rotating plate 16 closes the slot 12 through the sliding groove 14. The mounting block 11 can be fixed, and then the movable rods 23 at both ends of the connecting member 2 are inserted into the mounting groove 17 in turn, and the detection member 3 can be installed inside the pipe mouth.

[0037] Embodiment 2

[0038] A main air pressure chamber 24 is provided inside the fixed rod 22, and the movable rod 23 is slidably connected to the main air pressure chamber 24; a secondary air pressure chamber 25 is provided inside the movable rod 23, and the secondary air pressure chamber 25 is connected to the main air pressure chamber 24. The internal space of the main air pressure chamber 24 is relatively large. When the movable rod 23 is retracted, the volume of the main air pressure chamber 24 is reduced, thereby increasing the air pressure. When the air pressure in the main air pressure chamber 24 increases, the movable rod 23 is pushed outward. The secondary air pressure chamber 25 is connected to the main air pressure chamber 24 through a small ventilation pipe, so that the air pressure in the main air pressure chamber 24 and the secondary air pressure chamber 25 are equal;

[0039] A sleeve 26 is provided in the secondary air pressure chamber 25, and a pressure chamber 27 is provided on the side surface of the sleeve 26. A piston rod 28 is movably connected in the sleeve 26, and the pressure chamber 27 is isolated from the secondary air pressure chamber 25. The sleeve 26 faces the groove wall of the mounting groove 17, and a piston rod 28 is connected to the sleeve 26. There is a certain movable space between the piston rod 28 and the inner wall of the sleeve 26, and the pressure chamber 27 is connected to the movable space. The movable space and the pressure chamber 27 are isolated from the secondary air pressure chamber 25. When the air pressure in the secondary air pressure chamber 25 increases, the air pressure presses the piston rod 28 to be pushed out along the axis direction of the sleeve 26. At this time, the volume of the movable space decreases, and the pressure in the pressure chamber 27 increases. The pressure chamber 27 can also be made of a material with a certain elasticity to increase the ability to withstand pressure. When the air pressure in the secondary air pressure chamber 25 decreases, the pressure in the pressure chamber 27 will push the piston rod 28 back through the movable space.

[0040] Connecting holes 29 are provided on both sides of the movable rod 23, and the mounting block 11 also has connecting holes 29 at the corresponding positions of the movable rod 23. The connecting holes 29 are adapted to the piston rod 28, and the connecting holes 29 are provided at the corresponding positions of the sleeve 26 and the piston rod 28. When the piston rod 28 is ejected, it can pass through the connecting hole 29 of the movable rod 23 and be inserted into the connecting hole 29 of the mounting block 11. When the piston rod 28 is fully retracted, the piston rod 28 can also close the connecting hole 29.

[0041] Operation process: When in use, the device is installed at the mouth of the smoke exhaust pipe 4. Since the smoke has a certain temperature, as the detection begins, the smoke will gradually heat the device, and the gas in the main air pressure chamber 24 and the auxiliary air pressure chamber 25 will be gradually heated. Due to thermal expansion and contraction, the air pressure in the main air pressure chamber 24 and the auxiliary air pressure chamber 25 will increase, and the movable rod 23 will be pushed outward by the pressure. However, since the top end of the movable rod 23 is tightly pressed against the mounting block 11, the movable rod 23 is pressed tighter but will not be displaced. The air pressure in the main air pressure chamber 24 and the auxiliary air pressure chamber 25 continues to increase, gradually exceeding the pressure in the pressure chamber 27, and pushing out the piston rod 28. The thermal expansion coefficient of the medium in the pressure chamber 27 is smaller than that of the medium in the main air pressure chamber 24 and the auxiliary air pressure chamber 25. At this time, the piston rod 28 extends from the connecting hole 29, extends from the movable rod 23 and is inserted into the mounting block 11, further fixing the movable rod 23, so that the device is installed more firmly.

[0042] Embodiment 3

[0043] The detection component 3 includes a fixed cylinder 31 arranged on the connecting shaft 21, a mounting cylinder 32 is provided at the center of the fixed cylinder 31, a concentration sensor 33 is installed in the mounting cylinder 32, the mounting cylinder 32 passes through the connecting shaft 21 and the fixed cylinder 31, the fixed cylinder 31 is fixedly connected to the connecting shaft 21, the axis of the mounting cylinder 32 and the axis of the fixed cylinder 31 are in the same plane and are perpendicular to each other, the mounting cylinder 32 passes through the connecting shaft 21 and is hollow inside, the axis of the mounting cylinder 32 is parallel to the axis of the smoke exhaust pipe 4, the concentration sensor 33 is fixedly installed inside the mounting cylinder 32, the detection end of the concentration sensor 33 slightly extends out of the bottom end of the mounting cylinder 32, directly pointing to the inside of the smoke exhaust pipe 4, to obtain a better detection effect.

[0044] Limiting rings 34 are provided on both sides of the fixed cylinder 31. The limiting rings 34 are rotatably connected to the connecting rings 35. The connecting rings 35 are fixedly connected to the movable cylinder 36. The movable cylinder 36 is rotatably matched with the connecting shaft 21. The connecting rings 35 are sleeved on the fixed cylinder 31 and the connecting shaft 21. The two movable cylinders 36 are symmetrically arranged with respect to the fixed cylinder 31. The outer wall shape of the fixed cylinder 31 is not affected as long as the center of gravity is on the axis of the connecting shaft 21.

[0045] A plurality of air pressure sensors 37 are fixedly installed on the side surface of the movable cylinder 36. The air pressure sensors 37 are arranged in an array. The air pressure sensors 37 are arranged on the outer surface of the movable cylinder 36 and can directly detect the air pressure at the outlet of the smoke exhaust pipe 4. When the fixed cylinder 31 remains stationary, the movable cylinder 36 can rotate around the connecting shaft 21, thereby continuously replacing the air pressure sensor 37 at the bottom to prevent the air pressure sensor 37 from overheating.

[0046] A plurality of fan blades 39 are fixedly installed on the side surface of the movable cylinder 36. The fan blades 39 are an arc-shaped plate structure. Two movable cylinders 36 are symmetrically arranged with respect to the fixed cylinder 31. By arranging the arc-shaped fan blades 39, the fan blades 39 can provide more rotational force under the blowing of the exhaust smoke, and due to the arc-shaped setting, the fan blades 39 on one side of the inner arc surface are subjected to greater force during rotation, while the fan blades 39 on the other side of the outer arc surface are subjected to less force, and can rotate better.

[0047] A connecting plate is fixedly installed between the two movable cylinders 36 , and a cleaning brush is provided on the surface of the connecting plate facing the fixed cylinder 31 , which can continuously scrape the concentration sensor 33 when the movable cylinder 36 rotates to prevent the sensor from being blocked.

[0048] The fixing member 1 is installed at the top of the smoke exhaust pipe 4. A cover 5 is installed on the upper surface of the smoke exhaust pipe 4 through a vertical pole. The slot 12 of the fixing member 1 is matched with the vertical pole.

[0049] Operation process: When in use, the smoke exhaust pipe 4 discharges the purified smoke to the outside, and the smoke directly hits the concentration sensor 33, and will not be affected by the rotating air pressure sensor 37, so the measurement accuracy is higher. The smoke will impact the fan blades 39 when being discharged, and the fan blades 39 drive the movable cylinder 36 to rotate, so that the air pressure sensor 37 below can be continuously replaced to prevent overheating, and when the movable cylinder 36 rotates, since the detection end of the concentration sensor 33 slightly extends out of the mounting cylinder 32, the cleaning brush can brush the detection end of the concentration sensor 33 at intervals to prevent the concentration sensor 33 from being blocked.

[0050] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can all be customized according to the description and the drawings. The specific connection methods of each part all adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0051] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0055] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0056] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The emission pressure and concentration detection device of biomass boiler flue gas after purification treatment is characterized in that: It comprises two identical fixing members (1), wherein the fixing members (1) are movably connected to a connecting member (2), and a detecting member (3) is mounted on the connecting member (2); The fixing member (1) comprises a mounting block (11), the mounting block (11) is provided with a slot (12) and a receiving slot (13), a rotating shaft (15) is arranged in the receiving slot (13), a rotating plate (16) is rotatably connected to the rotating shaft (15), the mounting block (11) is further provided with a sliding slot (14) in the slot (12), the rotating plate (16) is adapted to the sliding slot (14), and a mounting slot (17) is further provided on one surface of the mounting block (11); The connecting member (2) comprises a connecting shaft (21), both ends of the connecting shaft (21) are fixedly connected to fixed rods (22), the fixed rod (22) is slidably connected to a movable rod (23), and the top end of the movable rod (23) is adapted to the mounting groove (17).

2. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 1 is characterized in that: A main air pressure chamber (24) is provided inside the fixed rod (22), and the movable rod (23) is slidably connected to the main air pressure chamber (24).

3. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 2 is characterized in that: A secondary air pressure chamber (25) is provided inside the movable rod (23), and the secondary air pressure chamber (25) is communicated with the main air pressure chamber (24).

4. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 3 is characterized in that: A sleeve (26) is provided in the secondary air pressure chamber (25), a pressure chamber (27) is provided on the peripheral side of the sleeve (26), a piston rod (28) is movably connected in the sleeve (26), and the pressure chamber (27) and the secondary air pressure chamber (25) are isolated from each other.

5. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 4 is characterized in that: The movable rod (23) is provided with connection holes (29) on both sides, and the mounting block (11) is also provided with connection holes (29) at positions corresponding to the movable rod (23), and the connection holes (29) are adapted to the piston rod (28).

6. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 1 or 5, characterized in that: The detection member (3) comprises a fixed cylinder (31) arranged on the connecting shaft (21), a mounting cylinder (32) is provided at the center of the fixed cylinder (31), a concentration sensor (33) is installed in the mounting cylinder (32), and the mounting cylinder (32) passes through the connecting shaft (21) and the fixed cylinder (31).

7. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 6 is characterized in that: The fixed cylinder (31) is provided with limiting rings (34) on both sides. The limiting rings (34) are rotatably connected to connecting rings (35). The connecting rings (35) are fixedly connected to a movable cylinder (36). The movable cylinder (36) is rotatably matched with the connecting shaft (21).

8. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 7, characterized in that: A plurality of air pressure sensors (37) are fixedly mounted on the peripheral side of the movable cylinder (36), and the air pressure sensors (37) are arranged in an array.

9. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 8, characterized in that: A plurality of fan blades (39) are fixedly mounted on the peripheral side of the movable cylinder (36), and the fan blades (39) are arc-shaped plate structures. Two movable cylinders (36) are symmetrically arranged with respect to the fixed cylinder (31).

10. The device for detecting the discharge pressure and concentration of flue gas from a biomass boiler after purification according to claim 9, characterized in that: The fixing member (1) is installed at the top of the smoke exhaust pipe (4); a cover (5) is installed on the upper surface of the smoke exhaust pipe (4) via a vertical pole; and a slot (12) of the fixing member (1) is adapted to the vertical pole.

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