Flue gas sampling device at denitration outlet of coal-fired power plant

Abstract

The invention relates to a flue gas sampling device for a denitration outlet of a coal-fired power plant. The flue gas sampling device comprises a sampling pipe, a first driving shaft, a cleaning scraper blade and an auxiliary mechanism, wherein the auxiliary mechanism comprises an auxiliary rotating mechanism and a limiting guide shaft, the cleaning scraper and the auxiliary rotating mechanism are both arranged in the sampling pipe and are attached to the inner wall of the sampling pipe, the first driving shaft is transversely and rotatably connected to the upper end of the inner side of the sampling pipe, and the limiting guide shaft is arranged in the center of the inner side of the sampling pipe; the cleaning scraping plate and the auxiliary rotating mechanism are rotationally connected with the limiting guide shaft through corresponding connecting rods, the first driving shaft is connected with the top end of the limiting guide shaft through a bevel gear, and an auxiliary moving device is arranged between the cleaning scraping plate and the auxiliary rotating mechanism; the auxiliary moving device is used for driving the cleaning scraper to slide up and down in the rotating process of the cleaning scraper. The flue gas sampling device for the denitration outlet of the coal-fired power plant is compact in overall structure, transmission parts are simplified, and dust impurities on the inner wall of the sampling pipe can be efficiently cleaned.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of flue gas sampling, and particularly relates to a flue gas sampling device for a denitration outlet of a coal-fired power plant. BACKGROUND

[0002] In order to meet environmental protection requirements, a coal-fired power plant usually adopts a catalytic reduction method to perform denitration treatment on flue gas. In order to improve the denitration effect on the flue gas, a flue gas sampling device is usually installed at a denitration outlet and connected with an air preheater or other related equipment, so as to sample the flue gas sample at the denitration outlet for subsequent analysis.

[0003] In the related art, after the flue gas is sampled by the flue gas sampling device, in order to avoid the dust impurities in the flue gas from adhering to the inner wall of the sampling pipe and affecting the normal flow of the flue gas during subsequent use, and to ensure the accuracy of sampling, an operator usually needs to extend a cleaning scraper from the pipe opening into the sampling pipe to clean the dust impurities on the inner wall of the sampling pipe. This operation is time-consuming and laborious, and the cleaning efficiency is low. SUMMARY

[0004] The present disclosure provides a flue gas sampling device for a denitration outlet of a coal-fired power plant, which can be applied to the technical field of flue gas sampling.

[0005] The present disclosure provides a flue gas sampling device for a denitration outlet of a coal-fired power plant, which comprises a sampling pipe (1), a first driving shaft (3), a cleaning scraper (4), and an auxiliary mechanism. The auxiliary mechanism comprises an auxiliary rotating mechanism and a limiting guide shaft (5). The cleaning scraper (4) and the auxiliary rotating mechanism are both arranged inside the sampling pipe (1) and mutually attached to the inner wall of the sampling pipe (1). The first driving shaft (3) is transversely rotatably connected to the upper end of the inner side of the sampling pipe (1). The limiting guide shaft (5) is arranged at the center position of the inner side of the sampling pipe (1). The cleaning scraper (4) and the auxiliary rotating mechanism are respectively rotatably connected to the limiting guide shaft (5) through corresponding connecting rods. The top end of the first driving shaft (3) is connected to the top end of the limiting guide shaft (5) through a bevel gear. An auxiliary moving device is arranged between the cleaning scraper (4) and the auxiliary rotating mechanism. The auxiliary moving device is used to drive the cleaning scraper (4) to slide up and down during the rotation of the cleaning scraper (4).

[0006] Further, the auxiliary rotating mechanism comprises a support auxiliary frame (102) and a positioning bracket (501); the support auxiliary frame (102) is fixedly connected to the upper end of the inner side of the sampling pipe (1), the limiting guide shaft (5) is rotatably connected to the inner side of the support auxiliary frame (102), and the positioning bracket (501) is fixedly connected to the outer side of the upper end of the limiting guide shaft (5) and rotatably connected with the limiting guide shaft (5); the limiting guide shaft (5) is a polygonal shaft structure, a guide through hole (504) is formed in the center position of the inner side connecting rod of the cleaning scraper (4), and the guide through hole (504) is slidably connected with the limiting guide shaft (5).

[0007] Further, the auxiliary moving device comprises a reciprocating screw rod (502) and a threaded transmission hole (505); the reciprocating screw rod (502) is rotatably connected to the outer end of the positioning bracket (501), and the threaded transmission hole (505) is formed in the outer side of the cleaning scraper (4) and is threadedly connected with the reciprocating screw rod (502).

[0008] Further, the auxiliary rotating mechanism comprises a drive gear ring (5031) and a transmission gear (503); the transmission gear (503) is coaxially fixedly connected to the outer side of the top end face of the reciprocating screw rod (502), the drive gear ring (5031) is concentrically fixedly connected to the upper end of the inner side of the sampling pipe (1), and the drive gear ring (5031) and the transmission gear (503) are in meshing engagement with each other.

[0009] Further, the bevel gear comprises a driving bevel gear (506) and a driven bevel gear (507); the driving bevel gear (506) is coaxially fixedly connected with the first driving shaft (3), the driven bevel gear (507) is coaxially fixedly connected with the limiting guide shaft (5), and the driving bevel gear (506) and the driven bevel gear (507) are in meshing engagement with each other.

[0010] Further, the diameter of the driving bevel gear (506) is greater than that of the driven bevel gear (507).

[0011] Further, the device further comprises a second driving shaft (2) and an anti-blocking mechanism; the bottom end face of the sampling pipe (1) is a horn-shaped structure that is inclined from the lower end outer side to the upper end inner side, the second driving shaft (2) is transversely rotatably connected to the lower end of the inner side of the sampling pipe (1), and the anti-blocking mechanism is arranged between the second driving shaft (2) and the sampling pipe (1).

[0012] Further, the anti-blocking mechanism comprises a transmission mechanism and an auxiliary swing lever (205); the auxiliary swing lever (205) is arranged at the bottom of the inside of the sampling pipe (1), and the second driving shaft (2) is connected with the auxiliary swing lever (205) through the transmission mechanism.

[0013] Further, the transmission mechanism comprises a positioning transmission shaft (201), an incomplete gear (203) and a driving gear (204); the incomplete gear (203) is coaxially fixedly connected at the center of the second driving shaft (2), the driving gear (204) is engaged with the incomplete gear (203), the driving gear (204) is coaxially fixedly connected at the center of the positioning transmission shaft (201), and the auxiliary swing lever (205) is coaxially fixedly connected outside the driving gear (204).

[0014] Further, the anti-blocking mechanism further comprises two driving wind wheels (202); the two driving wind wheels (202) are coaxially fixedly connected at the left and right sides of the outer end of the second driving shaft (2).

[0015] The coal-fired power plant denitration outlet flue gas sampling device provided by the embodiment of the present disclosure comprises a sampling pipe, a first driving shaft, a cleaning scraper and an auxiliary mechanism; the auxiliary mechanism comprises an auxiliary rotating mechanism and a limiting guide shaft; the cleaning scraper and the auxiliary rotating mechanism are arranged inside the sampling pipe and are in close contact with the inner wall of the sampling pipe; the first driving shaft is transversely rotatably connected to the upper end inside the sampling pipe; the limiting guide shaft is arranged at the center of the inside of the sampling pipe; the cleaning scraper and the auxiliary rotating mechanism are rotatably connected to the limiting guide shaft through corresponding connecting rods; the top end of the first driving shaft is connected to the limiting guide shaft through a bevel gear; an auxiliary moving device is arranged between the cleaning scraper and the auxiliary rotating mechanism; and the auxiliary moving device is used to drive the cleaning scraper to slide up and down during the rotation of the cleaning scraper.

[0016] According to the above description, the flue gas sampling device for the denitration outlet of the coal-fired power plant provided by the embodiment of the present disclosure can drive the limiting guide shaft to rotate by rotating the first driving shaft after the flue gas sampling is completed, so that the cleaning scraper connected to the limiting guide shaft can clean the sampling pipe. Compared with the manual cleaning of the sampling pipe by the operator in the prior art, the flue gas sampling device for the denitration outlet of the coal-fired power plant provided by the embodiment of the present disclosure simplifies the cleaning steps, and since the limiting guide shaft is centrally arranged and rotatably connected to the cleaning scraper through the connecting rod, the cleaning scraper can be stably guided along the central axis of the sampling pipe during the movement, avoiding deviation and improving the cleaning effect. In the flue gas sampling device for the denitration outlet of the coal-fired power plant provided by the embodiment of the present disclosure, the auxiliary moving device is linked with the cleaning scraper, so that the cleaning scraper can slide up and down along the limiting guide shaft while rotating, forming a spiral composite motion track, fully covering the inner wall of the sampling pipe, significantly improving the dust removal efficiency, and the design that the cleaning scraper is attached to the inner wall of the sampling pipe further enhances the scraping effect and reduces the residue. The flue gas sampling device for the denitration outlet of the coal-fired power plant provided by the embodiment of the present disclosure has a compact overall structure and simplified transmission components, which reduces the maintenance complexity while ensuring the cleaning effect, and improves the practicality and flexibility of the device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In the following description of exemplary embodiments in conjunction with the drawings, more details, features and advantages of the present disclosure are disclosed, in which:

[0018] Figure 1 The overall isometric structure schematic diagram of the flue gas sampling device for the denitration outlet of the coal-fired power plant provided by an exemplary embodiment of the present disclosure is shown in the figure.

[0019] Figure 2 The installation structure schematic diagram of the auxiliary mechanism, the first driving shaft and the cleaning scraper provided by an exemplary embodiment of the present disclosure is shown in the figure.

[0020] Figure 3 The installation cross-sectional structure schematic diagram of the cleaning scraper and the auxiliary mechanism provided by an exemplary embodiment of the present disclosure is shown in the figure.

[0021] Figure 4 The overall isometric structure schematic diagram of the flue gas sampling device for the denitration outlet of the coal-fired power plant provided by another exemplary embodiment of the present disclosure is shown in the figure.

[0022] Figure 5 The installation structure schematic diagram of the second driving shaft and the anti-blocking auxiliary mechanism provided by an exemplary embodiment of the present disclosure is shown in the figure.

[0023] Explanation of reference signs:

[0024] 1-sampling pipe; 102-supporting auxiliary frame; 2-second driving shaft; 201-positioning transmission shaft; 202-driving wind wheel; 203-incomplete gear; 204-driving gear; 205-assisting swing lever; 3-first driving shaft; 4-cleaning scraper; 5-limiting guide shaft; 501-positioning support; 502-reciprocating screw; 503-transmission gear; 5031-driving gear ring; 504-guiding through hole; 505-threaded transmission hole; 506-driving bevel gear; 507-following bevel gear. DETAILED DESCRIPTION

[0025] Embodiments of the present disclosure will be described in more detail with reference to the drawings. While certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It should be understood that the drawings of the present disclosure are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure.

[0026] It should be understood that each step described in the method embodiments of the present disclosure can be performed in different orders and / or in parallel. In addition, the method embodiments can include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0027] The term “comprising” and variations thereof as used herein are open-ended, that is, “including but not limited to”. The term “based on” is “based, at least in part, on”. The term “one embodiment” means “at least one embodiment”; the term “another embodiment” means “at least one additional embodiment”; the term “some embodiments” means “at least some embodiments”. Related definitions are given in the description below. It should be noted that the concepts mentioned in the present disclosure are merely used for distinguishing different devices, modules or units, and should not be construed as limiting the functions of the devices, modules or units.

[0028] It should be noted that the modification of “one” or “more” mentioned in the present disclosure is illustrative rather than restrictive, and those skilled in the art should understand that “one” or “more” should be understood as “one or more” unless otherwise explicitly indicated in the context.

[0029] The names of the messages or information exchanged between the plurality of devices in the embodiments of the present disclosure are only for illustrative purposes, and are not intended to limit the scope of the messages or information.

[0030] It can be understood that, before using the technical solutions disclosed in the embodiments of the present disclosure, the type of personal information involved in the present disclosure, the use range, the use scenario, etc. should be informed to the user and the authorization of the user should be obtained through appropriate means according to relevant laws and regulations.

[0031] For example, in response to receiving the active request of the user, the prompt information is sent to the user to explicitly prompt the user that the operation requested to be performed will require obtaining and using the personal information of the user. Thus, the user can autonomously select whether to provide the personal information to the software or hardware such as the electronic device, the application program, the server or the storage medium, etc. performing the operation of the technical solutions of the present disclosure according to the prompt information.

[0032] As an optional but non-limiting implementation manner, in response to receiving the active request of the user, the manner of sending the prompt information to the user may, for example, be the manner of a pop-up window, and the prompt information may be presented in the form of text in the pop-up window. In addition, the pop-up window may also carry selection controls for the user to select "agree" or "disagree" to provide the personal information to the electronic device. It can be understood that the above notification and obtaining of the authorization of the user are only illustrative, and do not limit the implementation manners of the present disclosure, and other manners meeting the relevant laws and regulations can also be applied to the implementation manners of the present disclosure.

[0033] In one embodiment, as shown in Figures 1 to 3 A flue gas sampling device for a coal-fired power plant denitration outlet is provided, which comprises a sampling pipe 1, a first driving shaft 3, a cleaning scraper 4 and an auxiliary mechanism. The auxiliary mechanism comprises an auxiliary rotating mechanism and a limiting guide shaft 5. The cleaning scraper 4 and the auxiliary rotating mechanism are arranged inside the sampling pipe 1 and are in close contact with the inner wall of the sampling pipe 1. The first driving shaft 3 is transversely rotatably connected to the upper end of the inside of the sampling pipe 1. The limiting guide shaft 5 is arranged at the center position of the inside of the sampling pipe 1. The cleaning scraper 4 and the auxiliary rotating mechanism are rotatably connected to the limiting guide shaft 5 through corresponding connecting rods, respectively. The first driving shaft 3 is connected to the top end of the limiting guide shaft 5 through a bevel gear. An auxiliary moving device is arranged between the cleaning scraper 4 and the auxiliary rotating mechanism. The auxiliary moving device is used to drive the cleaning scraper 4 to slide up and down during the rotation of the cleaning scraper 4.

[0034] Here, after the flue gas sampling is completed, the flue gas sampling device is connected with the conical gear at the top of the limiting guide shaft 5 through the first driving shaft 3, so that the operator only needs to rotate the first driving shaft 3 to drive the limiting guide shaft 5 to rotate, so that the cleaning scraper 4 connected to the limiting guide shaft 5 can clean the sampling pipe 1. Compared with the manual cleaning of the sampling pipe by the operator in the traditional technology, the flue gas sampling device at the denitration outlet of the coal-fired power plant provided in the embodiment simplifies the cleaning step, and since the limiting guide shaft 5 is centrally arranged and rotatably connected to the cleaning scraper 4 through the connecting rod, the cleaning scraper 4 can be stably guided along the central axis of the sampling pipe 1 during movement, avoiding deviation and improving the cleaning effect. In the flue gas sampling device at the denitration outlet of the coal-fired power plant provided in the embodiment, the auxiliary moving device is linked with the cleaning scraper 4, so that the cleaning scraper 4 can slide up and down along the limiting guide shaft while rotating, forming a spiral composite motion track, fully covering the inner wall of the sampling pipe 1, significantly improving the dust removal efficiency, and the design of the cleaning scraper 4 being attached to the inner wall of the sampling pipe 1 further enhances the scraping effect and reduces residue. The flue gas sampling device at the denitration outlet of the coal-fired power plant provided in the embodiment has a compact overall structure and simplified transmission components, which reduces the maintenance complexity while ensuring the cleaning effect, improving the practicality and flexibility of the device.

[0035] In one possible embodiment, as shown in Figures 1 to 3 The auxiliary rotating mechanism includes a support auxiliary frame 102 and a positioning bracket 501, wherein the support auxiliary frame 102 is fixedly connected to the upper end of the inner side of the sampling pipe 1, and the limiting guide shaft 5 is rotatably connected to the inner side of the support auxiliary frame 102; the positioning bracket 501 is fixedly connected to the outer side of the upper end of the limiting guide shaft 5 and is rotatably connected with the limiting guide shaft 5. The limiting guide shaft 5 is a polygonal shaft structure, and the center position of the inner side connecting rod of the cleaning scraper 4 is provided with a guide through hole 504 which is slidably connected with the limiting guide shaft 5.

[0036] Here, the support auxiliary frame 102 can be welded or bolted to the upper end of the inner side of the sampling pipe 1, and the material of the support auxiliary frame 102 can be stainless steel, and the surface is plated with chromium to enhance wear resistance. It should be noted that the connection mode of the support auxiliary frame 102 and the sampling pipe 1 is not limited here, and the material of the support auxiliary frame 102 can also be other materials besides stainless steel, which is not limited here.

[0037] The limiting guide shaft 5 is rotationally connected to the inner side of the support auxiliary frame 102, the support auxiliary frame 102 can limit the position of the limiting guide shaft 5, so that the position of the limiting guide shaft 5 remains unchanged during rotation, the limiting guide shaft 5 is a polygonal shaft structure, which can be hexagonal or quadrangular, and the specific structure is not limited here, the guide through hole 504 opened in the center position of the inner side connecting rod of the cleaning scraper 4 is in sliding connection with the limiting guide shaft 5, and the through hole shape of the guide through hole 504 matches the polygonal cross section of the limiting guide shaft 5.

[0038] In one possible embodiment, as shown in the figure, Figures 1 to 3 The auxiliary moving device includes a reciprocating screw 502 and a threaded transmission hole 505, wherein the reciprocating screw 502 is rotationally connected to the outer end of the positioning bracket 501, the threaded transmission hole 505 is opened on the outer side of the cleaning scraper 4, and the threaded transmission hole 505 is connected with the reciprocating screw 502 through threads.

[0039] Here, the positioning bracket 501 is fixedly connected to the upper end of the limiting guide shaft 5, the reciprocating screw 502 is rotationally connected to the outer end of the positioning bracket 501, and the thread type of the reciprocating screw 502 can be trapezoidal thread to ensure transmission stability under high load. It should be noted that the thread type of the reciprocating screw 502 is not limited here, the threaded transmission hole 505 is opened on the outer side of the cleaning scraper 4, and the threaded transmission hole 505 is precisely matched with the thread of the reciprocating screw 502.

[0040] In one possible embodiment, as shown in the figure, Figures 1 to 3 The auxiliary rotating mechanism includes a drive gear ring 5031 and a transmission gear 503, wherein the transmission gear 503 is coaxially fixedly connected to the outer side of the top end face of the reciprocating screw 502, the drive gear ring 5031 is concentrically fixedly connected to the upper end of the inner side of the sampling pipe 1, and the drive gear ring 5031 and the transmission gear 503 are in meshing relationship with each other.

[0041] Here, the drive gear ring 5031 is concentrically fixedly connected to the upper end of the inner side of the sampling pipe, and can adopt a segmented flange structure connected with the pipe wall of the sampling pipe 1 by bolts. The material of the drive gear ring 5031 can be alloy steel, the tooth part is subjected to carburizing quenching treatment, and the number of teeth can be 60. It should be noted that the specific parameters and material of the drive gear ring 5031 are not limited here.

[0042] The transmission gear 503 is coaxially fixedly connected to the outer side of the top end face of the reciprocating screw 502, and the transmission gear 503 and the reciprocating screw 502 can drive the cleaning scraper 4 to move up and down through the threaded transmission hole 505, wherein the material of the transmission gear 503 can be consistent with that of the drive gear ring 5031, the number of teeth can be 30, the transmission gear 503 and the drive gear ring 5031 form a 2:1 reduction ratio, and it should be noted that the specific parameters and material of the transmission gear 503 are not limited here.

[0043] In a possible embodiment, as shown in Figures 1 to 3 The bevel gear includes a driving bevel gear 506 and a driven bevel gear 507, wherein the driving bevel gear 506 is coaxially fixedly connected with the first driving shaft 3, the driven bevel gear 507 is coaxially fixedly connected with the limiting guide shaft 5, the driving bevel gear 506 and the driven bevel gear 507 are in mesh with each other, and the diameter of the driving bevel gear 506 is greater than that of the driven bevel gear 507.

[0044] In a possible embodiment, after the flue gas sampling is completed, the operator can manually rotate the first driving shaft 3 or rotate the first driving shaft 3 by the motor. When the first driving shaft 3 is manually or electrically driven to rotate, the driving bevel gear 506 inside the first driving shaft 3 meshes with the driven bevel gear 507 at the top of the limiting guide shaft 5, drives the limiting guide shaft 5 to rotate around the axis, and the limiting guide shaft 5 pushes the reciprocating lead screw 502 to revolve around the center of the sampling pipe 1 through the positioning support 501. At the same time, the transmission gear 503 at the top of the reciprocating lead screw 502 meshes with the driving gear ring 5031 fixed to the inner side of the upper end of the sampling pipe 1, forcing the reciprocating lead screw 502 to counter-rotate during revolution. The counter-rotation of the reciprocating lead screw 502 is matched with the threaded transmission hole 505 on the outer side of the cleaning scraper 4 through the threads of the reciprocating lead screw 502, driving the cleaning scraper 4 to slide up and down along the limiting guide shaft 5. The polygonal shaft structure of the limiting guide shaft 5 is matched with the guide through hole 504 on the inner side of the cleaning scraper 4, restricting the synchronous rotation of the cleaning scraper 4, so as to realize the combined motion of the spiral lifting of the cleaning scraper 4, and completely scrape off the dust and impurities attached to the inner wall of the sampling pipe 1.

[0045] In a possible embodiment, as shown in Figure 4 The flue gas sampling device of the coal-fired power plant denitration outlet further includes a second driving shaft 2 and an anti-blocking mechanism. The bottom end face of the sampling pipe 1 is a horn mouth structure that is inclined from the lower end outside to the upper end inside. The second driving shaft 2 is transversely rotatably connected to the lower end inside of the sampling pipe 1. The anti-blocking mechanism is arranged between the second driving shaft 2 and the sampling pipe 1. The anti-blocking mechanism includes a transmission mechanism and an auxiliary swing rod 205. The auxiliary swing rod 205 is arranged at the bottom inside of the sampling pipe 1. The second driving shaft 2 is connected with the auxiliary swing rod 205 through the transmission mechanism.

[0046] Here, the bottom end face of the sampling pipe 1 is a horn mouth structure that is inclined from the lower end outside to the upper end inside. The inclination angle can be 30°. The inlet diameter can be 300 mm. The outlet diameter can be 200 mm. The horn mouth structure can guide the flue gas to concentrate and reduce the deposition of large particles. It should be noted that the specific parameters of the sampling pipe 1 are not limited here and can be flexibly selected according to the actual situation.

[0047] The second driving shaft 2 is transversely rotatably connected to the inner lower end of the sampling pipe 1, and the two ends of the second driving shaft 2 can be connected to the pipe wall of the sampling pipe 1 through the self-aligning roller bearing. It should be noted that the material of the second driving shaft 2 and the connection mode of the second driving shaft 2 and the sampling pipe 1 are not limited herein, and the second driving shaft 2 is connected to the auxiliary swing lever 205 through a transmission mechanism. The auxiliary swing lever 205 can be an L-shaped stainless steel plate, which is used to push the floating objects at the bottom of the sampling pipe 1. It should be noted that the material of the auxiliary swing lever 205 is not limited herein.

[0048] In one possible embodiment, as shown in Figure 5 The transmission mechanism includes a positioning transmission shaft 201, an incomplete gear 203, and a driving gear 204. The incomplete gear 203 is coaxially and fixedly connected to the center of the second driving shaft 2. The driving gear 204 is in meshing relationship with the incomplete gear 203. The driving gear 204 is coaxially and fixedly connected to the center of the positioning transmission shaft 201. The auxiliary swing lever 205 is coaxially and fixedly connected to the outside of the driving gear 204.

[0049] Here, the incomplete gear 203 is coaxially and fixedly connected to the center of the second driving shaft 2. The number of teeth of the incomplete gear 203 is 1 / 3 of the number of teeth of the driving gear 204. For example, the number of teeth of the driving gear 204 is 24, and the number of teeth of the incomplete gear 203 is 8. The teeth of the incomplete gear 203 can adopt an involute tooth profile to ensure precise meshing with the driving gear 204. The driving gear 204 is coaxially and fixedly connected to the center of the positioning transmission shaft 201, and the number of teeth is 24. It should be noted that the specific parameters of the incomplete gear 203 and the driving gear 204 are not limited herein and can be flexibly adjusted according to actual conditions. The driving gear 204 is coaxially and fixedly connected to the center of the positioning transmission shaft 201. The positioning transmission shaft 201 is used to keep the stability of the auxiliary swing lever 205 during the swinging process of the auxiliary swing lever 205.

[0050] In one possible embodiment, as shown in Figure 5 The anti-blocking mechanism further includes two driving wind wheels 202, which are coaxially and fixedly connected to the left and right sides of the outer ends of the second driving shaft 2.

[0051] Here, the outer part of the second drive shaft 2 at both ends is coaxially fixedly connected with two drive wind wheels 202, the two drive wind wheels 202 are symmetrically distributed to balance the rotating torque, and the two drive wind wheels 202 are casted by high-temperature-resistant stainless steel, the impeller diameter is 250 mm, the number of blades is 6, the blade angle is 25°, the blade type is aerodynamic airfoil design, and the maximum resistance temperature is 400℃. It should be noted that the specific parameters of the drive wind wheel 202 are not limited here, and can be flexibly adjusted according to the actual situation, and the two drive wind wheels 202 can be connected with the second drive shaft 2 through a key groove and locked by double nuts to prevent loosening when the drive wind wheel 202 rotates at high speed.

[0052] In a possible embodiment, when the flue gas flows, the airflow drives the drive wind wheels 202 on both sides of the second drive shaft 2 to rotate, drives the second drive shaft 2 to rotate, and the incomplete gear 203 at the center of the second drive shaft 2 intermittently engages with the drive gear 204 on the positioning transmission shaft 201, drives the positioning transmission shaft 201 to periodically rotate, and the drive gear 204 drives the coaxially fixed auxiliary swing rod 205 to swing back and forth, removes the floating objects remaining in the sampling pipe 1, avoids blockage, and ensures that the flue gas smoothly enters the inside of the sampling pipe 1.

[0053] It can be known from the above embodiment that the flue gas sampling device for the denitration outlet of a coal-fired power plant provided by the technical scheme of the present disclosure can drive the drive wind wheels 202 on both sides of the second drive shaft 2 to rotate when the flue gas flows into the sampling pipe 1, drives the second drive shaft 2 to rotate, and the incomplete gear 203 at the center of the second drive shaft 2 intermittently engages with the drive gear 204 on the positioning transmission shaft 201, drives the positioning transmission shaft 201 to periodically rotate, and the drive gear 204 drives the coaxially fixed auxiliary swing rod 205 to swing back and forth, removes the floating objects remaining in the sampling pipe 1; after the flue gas sampling is completed, the operator can manually rotate the first drive shaft 3 or rotate the first drive shaft 3 through a motor, when the first drive shaft 3 is manually or electrically driven to rotate, the driving bevel gear 506 in the first drive shaft 3 engages with the driven bevel gear 507 at the top of the limiting guide shaft 5, drives the limiting guide shaft 5 to rotate around the axis, the limiting guide shaft 5 pushes the reciprocating lead screw 502 to revolve around the center of the sampling pipe 1 through the positioning bracket 501, at the same time, the transmission gear 503 at the top of the reciprocating lead screw 502 engages with the drive gear ring 5031 fixed to the upper end of the inside of the sampling pipe 1, forces the reciprocating lead screw 502 to counter-rotate in the revolving process, the counter-rotation of the reciprocating lead screw 502 is matched with the threaded transmission hole 505 of the outside of the cleaning scraper 4 through the threads, drives the cleaning scraper 4 to slide up and down along the axis of the limiting guide shaft 5, and the polygonal shaft structure of the limiting guide shaft 5 is matched with the guide through hole 504 in the inside of the cleaning scraper 4, restricts the synchronous rotation of the cleaning scraper 4, so as to realize the combined motion of the helical lifting of the cleaning scraper 4, and completely scrape off the dust and impurities attached to the inner wall of the sampling pipe 1.

[0054] In a possible embodiment, a stepping motor and a control unit can be added to the outer end of the first drive shaft 3 to realize automatic operation of the sampling tube 1. The control unit integrates a pressure sensor and a timer, and can automatically trigger the cleaning process according to the sampling frequency or the resistance in the sampling tube 1. For example, the pressure sensor monitors the airflow resistance in the sampling tube 1 in real time. When the resistance exceeds a preset threshold, for example, the airflow resistance is greater than 200 Pa, or after 10 samplings are completed, the control unit sends a command to start the stepping motor. The stepping motor drives the first drive shaft 3 to rotate through a coupling, accurately controls the stroke and speed of the cleaning scraper 4. For example, the control unit controls the speed of the cleaning scraper 4 to be 20 rpm and the stroke to be 150 mm. After cleaning is completed, the sensor data is reset, and the system sends the completion status to the central control platform through an LED indicator or a wireless signal.

[0055] As can be seen from the above description, the embodiment realizes fully automatic operation of the cleaning process by adding a stepping motor and an intelligent control unit to the outer end of the first drive shaft. The control unit integrates a pressure sensor and a timer, which can monitor the airflow resistance in the sampling tube in real time. When the resistance exceeds a preset threshold or reaches a set number of samplings, the cleaning program is automatically triggered. The stepping motor accurately drives the cleaning scraper to perform a composite motion of rotation and axial sliding, which can completely remove dust and impurities attached to the inner wall of the sampling tube. After cleaning is completed, the system feeds back the status to the central control platform through an indicator light or a wireless signal, which can significantly reduce the frequency of manual intervention. This design greatly improves the cleaning efficiency and equipment reliability, prolongs the maintenance cycle, ensures the continuity of flue gas sampling and the accuracy of detection data, and is especially suitable for complex industrial environments with high dust and high humidity.

[0056] In a possible embodiment, the incomplete gear 203, the drive gear 204, and the transmission gear 503 of the auxiliary rotating mechanism of the anti-blocking mechanism can be replaced with ceramic matrix composite gears, and the surface is coated with a silicon carbide wear-resistant coating. The ceramic matrix composite gear can maintain dimensional stability in a high-temperature flue gas environment, avoiding meshing failure caused by thermal expansion of traditional metal gears. The silicon carbide wear-resistant coating can reduce the friction coefficient, reduce gear wear, and prolong the service life of the gear.

[0057] As can be known from the above description, the anti-blocking mechanism and the auxiliary rotating mechanism are replaced by ceramic matrix composite gears coated with a silicon carbide wear-resistant coating, which can significantly improve the high-temperature resistance and durability of the device. The ceramic matrix composite gears can maintain stable size and strength in high-temperature flue gas environment, avoiding the meshing failure problem of traditional metal gears caused by thermal expansion. The silicon carbide coating on the surface of the gear further reduces the friction coefficient, which can reduce gear wear and prolong the service life. This design effectively adapts to extreme industrial environments, such as high-temperature and highly corrosive flue gas environments, reducing the maintenance frequency caused by gear damage, ensuring the long-term reliable operation of the anti-blocking mechanism and the auxiliary rotating mechanism, reducing downtime risks and maintenance costs, and enhancing the overall stability of the equipment.

[0058] In a possible embodiment, a dust concentration sensor, a vibration sensor and a temperature sensor can be embedded inside the sampling pipe 1, and connected to an industrial Internet of Things platform through a 4G / 5G communication module to realize remote monitoring and predictive maintenance. The sensors can monitor the dust concentration (mg / m 3 ), equipment vibration amplitude (mm / s) and temperature (℃) in real time, with a sampling frequency of 1 time / s. The data can also be uploaded to a cloud AI model to analyze the wear degree of the cleaning scraper 4, the gear meshing state and the balance of the driving wind wheel 202. When the AI model predicts that the component life is insufficient, the system automatically generates a work order and pushes it to the maintenance personnel's mobile APP, prompting to replace the worn parts.

[0059] As can be known from the above description, by integrating dust concentration, vibration and temperature sensors inside the sampling pipe and connecting to an industrial Internet of Things platform, the device realizes full-process remote monitoring and intelligent maintenance. The sensors can collect dust concentration, equipment vibration and temperature data in real time, and the cloud AI model can analyze the wear degree of the cleaning scraper, the gear meshing state and the balance of the driving components to accurately predict the component life. When the key components approach the wear threshold, the system automatically generates a maintenance work order and pushes it to the maintenance personnel's mobile terminal to realize predictive maintenance. This design significantly reduces the risk of unexpected equipment downtime, reduces the frequency of manual inspection, optimizes maintenance costs, prolongs the service life of the equipment, ensures the efficiency and data reliability of the flue gas sampling process, and provides intelligent support for industrial environmental monitoring.

[0060] In a possible embodiment, the bottom of the sampling pipe 1 can be designed as a telescopic structure, the inlet diameter is adjusted by an external knob, different flue gas environments with different flow rates are adapted, and the cleaning scraper 4 adopts a quick release design, supports replacing scrapers made of different materials, such as PTFE and carbon fiber composite materials, and is fixed by a buckle and a limiting guide shaft 5. For example, the staff can adjust the horn opening angle by the external knob, optimize the flue gas inflow speed, reduce the deposition of large particles, and the staff can flexibly adjust the cleaning scraper 4 according to the environment, for example, in a highly corrosive environment, a carbon fiber scraper is used, and in a high humidity environment, a hydrophobic PTFE scraper is used.

[0061] As known from the above description, the present embodiment significantly improves the applicability and maintenance convenience of the device by designing the bottom of the sampling pipe as an adjustable telescopic structure and adopting a quick release cleaning scraper. The staff can flexibly adjust the inlet diameter of the sampling pipe bottom by an external knob, optimize the flue gas inflow efficiency of different flow rates, and reduce the deposition of large particles. The cleaning scraper supports quick replacement of scrapers made of materials such as PTFE and carbon fiber, and can adapt to various working conditions such as high corrosion and high humidity, improve the cleaning effect in a targeted manner, and the buckle fixing design simplifies the disassembly and assembly process of the scraper, reduces the time and labor cost of maintenance, and expands the application scenarios of the device and significantly enhances the environmental adaptability, ensuring long-term stable and efficient flue gas sampling, and providing reliable protection for environmental monitoring in complex industrial environments.

[0062] The flue gas sampling device for the denitration outlet of a coal-fired power plant provided by the technical scheme of the present disclosure is designed in cooperation with the auxiliary rotating mechanism and the anti-blocking mechanism, and the driving fan is automatically driven by the flue gas flow, so that the driving fan drives the auxiliary swing rod to swing periodically, effectively removing the floating objects at the bottom of the sampling pipe and avoiding blockage. After sampling is completed, the cleaning scraper can be driven by the first driving shaft to perform a spiral lifting composite motion, efficiently scraping the dust on the inner wall of the sampling pipe. The cleaning efficiency of the sampling pipe is ensured while the convenience of cleaning the sampling pipe is improved, and the use flexibility of the flue gas sampling device for the denitration outlet of a coal-fired power plant in actual application is further improved.

[0063] The above description is only some embodiments of the present disclosure and an explanation of the technical principles applied. Those skilled in the art should understand that the disclosure range involved in the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features disclosed in the present disclosure (but not limited to) having similar functions to form technical solutions.

[0064] While certain embodiments of the disclosure have been described herein in detail as presently preferred, many modifications and variations thereof will be apparent to those skilled in the art, without departing from the scope and spirit of the disclosure. It is to be understood that those skilled in the art will be able to devise many embodiments of the disclosure which, while not explicitly described or shown herein, embody the principles of the disclosure and are included within its spirit and scope. Accordingly, all such suitable modifications and equivalents should be considered as within the scope of the disclosure. The scope of the disclosure is to be indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A flue gas sampling device for a coal-fired power plant denitration outlet, characterized in that, The utility model provides a kind of sampling tube, first drive shaft (3), cleaning scraper (4) and auxiliary mechanism;Wherein, the auxiliary mechanism includes auxiliary rotating mechanism and limiting guide shaft (5), the cleaning scraper (4) and the auxiliary rotating mechanism are arranged inside the sampling tube (1) and mutually fit with the inner wall of the sampling tube (1), the first drive shaft (3) is transversely rotatably connected in the upper end of the inside of the sampling tube (1), the limiting guide shaft (5) is arranged in the center position of the inside of the sampling tube (1), the cleaning scraper (4) and the auxiliary rotating mechanism are rotatably connected with the limiting guide shaft (5) by corresponding connecting rod respectively, the top of the first drive shaft (3) and the limiting guide shaft (5) is connected by bevel gear, the cleaning scraper (4) and the auxiliary rotating mechanism are provided with auxiliary moving device between, the auxiliary moving device is used to drive the cleaning scraper (4) to slide up and down in the cleaning scraper (4) rotating process. The auxiliary rotating mechanism includes: support auxiliary frame (102) and positioning support (501);Wherein, the support auxiliary frame (102) is fixedly connected to the upper end of the inside of the sampling tube (1), and the limiting guide shaft (5) is rotatably connected to the inside of the support auxiliary frame (102), the positioning support (501) is fixedly connected to the outside of the upper end of the limiting guide shaft (5), and is rotatably connected with the limiting guide shaft (5);The limiting guide shaft (5) is a polygonal shaft structure, a guide through hole (504) is formed in the center position of the connecting rod inside the cleaning scraper (4), and the guide through hole (504) is slidably connected with the limiting guide shaft (5).

2. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 1, characterized in that, The auxiliary moving device includes: reciprocating screw (502) and threaded transmission hole (505);Wherein, the reciprocating screw (502) is rotatably connected to the outer end of the positioning support (501), the threaded transmission hole (505) is formed in the outside of the cleaning scraper (4), and the threaded transmission hole (505) is connected with the reciprocating screw (502) by thread.

3. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 2, characterized in that, The auxiliary rotating mechanism includes: drive gear ring (5031) and transmission gear (503);Wherein, the transmission gear (503) is coaxially fixedly connected to the outer side of the top end face of the reciprocating screw (502), the drive gear ring (5031) is concentrically fixedly connected to the upper end of the inside of the sampling tube (1), and the drive gear ring (5031) and the transmission gear (503) are engaged with each other.

4. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 3, characterized in that, The bevel gear includes: driving bevel gear (506) and driven bevel gear (507);Wherein, the driving bevel gear (506) is coaxially fixedly connected with the first drive shaft (3), the driven bevel gear (507) is coaxially fixedly connected with the limiting guide shaft (5), and the driving bevel gear (506) and the driven bevel gear (507) are engaged with each other.

5. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 1, characterized in that, The diameter of the driving bevel gear (506) is greater than the diameter of the driven bevel gear (507).

6. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 5, characterized in that, ​ 7. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 1, characterized in that, The device also comprises a second driving shaft (2) and a blockage prevention mechanism; wherein the bottom end surface of the sampling tube (1) is a horn-shaped structure which is inclined from the lower outer side to the upper inner side, the second driving shaft (2) is transversely rotatably connected to the lower end of the inner side of the sampling tube (1), and the blockage prevention mechanism is arranged between the second driving shaft (2) and the sampling tube (1).

8. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 7, characterized in that, The blockage prevention mechanism comprises a transmission mechanism and an auxiliary swing lever (205); wherein the auxiliary swing lever (205) is arranged at the bottom of the inner side of the sampling tube (1), and the second driving shaft (2) is connected to the auxiliary swing lever (205) through the transmission mechanism.

9. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 8, characterized in that, The transmission mechanism comprises a positioning transmission shaft (201), an incomplete gear (203) and a driving gear (204); wherein the incomplete gear (203) is coaxially fixedly connected to the center of the second driving shaft (2), the driving gear (204) is in mesh with the incomplete gear (203), the driving gear (204) is coaxially fixedly connected to the center of the positioning transmission shaft (201), and the auxiliary swing lever (205) is coaxially fixedly connected to the outer side of the driving gear (204).

10. The flue gas sampling device for de-NOx exit of coal-fired power plants according to claim 8, characterized in that, The blockage prevention mechanism further comprises two driving wind wheels (202); wherein the two driving wind wheels (202) are coaxially fixedly connected to the left and right sides of the outer end of the second driving shaft (2), respectively.

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