Fly ash sampling device and method

Abstract

The invention provides a fly ash sampling device and method.The fly ash sampling device comprises a shell, the top end of the shell is connected with a boiler flue, a sliding valve is arranged at one end of a sampling opening of the boiler flue, a sampling pipe is arranged in the shell, a driving mechanism is arranged between the shell and the sampling pipe, and an ash removing opening is formed in the side end of the sampling pipe; a bypass pipe communicated with a boiler flue is arranged at the side end of the shell, the bypass pipe is connected with a gas storage tank for cleaning ash, and a sample tank is arranged at the bottom end of the shell. The sampling tube is of a Venturi tube structure, a negative pressure area is formed at the top of the sampling tube, constant-speed suction of flue gas and fly ash can be achieved, the rubber valve is arranged at the top end of the sampling tube, the larger the pressure difference between the sampling tube and a boiler flue is, the larger the opening degree of the rubber valve is, the flow area is increased in a self-adaptive mode, and constant-speed suction is automatically tended within a certain range; flue gas flow velocity fluctuation in a boiler flue is matched, self-balance of pressure difference, opening degree and flow velocity is achieved, and fly ash accumulation is avoided.

Description

Technical Field

[0001] This invention belongs to the field of thermal power boiler technology, specifically relating to a fly ash sampling device and method. Background Technology

[0002] In order to determine and analyze the combustion status of the combustors in the boiler of a thermal power plant, it is necessary to sample the fly ash produced by the boiler combustion, test the fly ash samples, and determine the combustion status of the combustors in the boiler by analyzing the composition of the fly ash.

[0003] Current fly ash sampling pipes are prone to clogging, and unclogging them is time-consuming, severely impacting work efficiency. Furthermore, due to the high pressure in the pipes during sampling, fly ash often leaks out, polluting the environment and threatening employee health. In addition, frequent maintenance increases costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fly ash sampling device and method to address the shortcomings of the prior art. The device can insert a sampling tube into the boiler flue for sampling, which can effectively prevent fly ash leakage. It can be purged by an external gas storage tank to prevent blockage. It does not require frequent maintenance, is simple and convenient to use, and can be widely applied.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a fly ash sampling device, characterized in that it includes a shell, the top of the shell is connected to a sampling port of a boiler flue through a flange, a sliding valve is provided at one end of the sampling port of the boiler flue, a sampling tube is provided inside the shell, a driving mechanism for driving the sampling tube to move is provided between the shell and the sampling tube, a cleaning port is provided at the side end of the sampling tube, a filter screen and a valve are provided at the cleaning port, a bypass pipe communicating with the boiler flue is provided at the side end of the shell, a valve is provided between the boiler flue and the bypass pipe, a gas storage tank for cleaning is connected to the bypass pipe, a sampling port is opened at the bottom end of the shell, a valve is provided at the sampling port, and a sample tank is provided below the sampling port.

[0006] The pressure inside the boiler flue is 0.1-0.4 MPa. The drive mechanism can drive the sampling tube into the sampling port. After the sliding valve is opened, the fly ash in the boiler flue enters the sampling tube under pressure and finally enters the sample container. After a certain period of time, the sampling is completed, the drive mechanism drives the sampling tube to reset, and the sliding valve closes.

[0007] Open the valve between the gas storage tank, boiler flue, and bypass pipe, and introduce compressed air into the sampling pipe to clean it and prevent blockage.

[0008] Preferably, the driving mechanism includes a first lead screw vertically rotatably mounted inside the housing, a threaded block threaded onto the first lead screw, a first guide rod vertically fixedly mounted inside the housing, a guide block slidably mounted on the first guide rod, the threaded block and the guide block being fixedly connected to the sampling tube, a drive box fixedly mounted on the outside of the housing, a drive shaft rotatably mounted inside the drive box via bearings, the drive shaft being connected to the first lead screw via a bevel gear set, bevel gears meshing with each other being fixedly mounted on the drive shaft and the first lead screw, and a drive motor being drivenly connected to the outer end of the drive shaft.

[0009] The drive motor drives the drive shaft to rotate, and the drive shaft drives the first lead screw to rotate, causing the threaded block to rise and fall along the first lead screw, which in turn causes the sampling tube to slide up and down along the first guide rod.

[0010] Preferably, a rotating shaft is vertically rotatably installed inside the housing, and the rotating shaft is connected to the first lead screw through a gear set. A first gear is fixedly installed on the sampling tube, and a second gear is provided on the rotating shaft. The second gear is limited and installed on the threaded block, and the rotating shaft passes through the threaded block. The first gear and the second gear mesh.

[0011] The rotating shaft can rotate with the first lead screw, which drives the second gear to rotate, causing the first gear and the sampling tube to rotate.

[0012] The rotating shaft has evenly spaced spline grooves on its circumference, and a spline is fixedly installed on the inner hole of the second gear. The spline and the spline groove are slidably connected in a one-to-one correspondence.

[0013] As the threaded block and sampling tube rise and fall, they cause the spline to slide along the spline groove, maintaining the engagement of the first gear with the second gear. That is, the sampling tube rotates while rising and falling.

[0014] Preferably, the top of the sampling tube has a Venturi tube structure, which creates a negative pressure zone at the top of the sampling tube, enabling the constant velocity intake of flue gas and fly ash. An internal gear ring is fixedly installed inside the top of the sampling tube, and a sealing block is slidably installed inside the top of the sampling tube. A second guide rod, slidably connected to the sealing block, is vertically installed at the bottom of the flange. A second lead screw is vertically rotatably installed at the bottom of the flange, and the second lead screw is threadedly connected to the sealing block. A third gear, meshing with the internal gear ring, is fixedly installed at the bottom of the second lead screw.

[0015] When the sampling tube rotates, it drives the third gear to rotate through the internal gear ring. The third gear drives the second lead screw to rotate, causing the sealing block to move relative to the sampling tube along the second guide rod. This can have a certain cleaning effect on the inlet end of the sampling tube, which is the top end and the outlet end is the bottom end.

[0016] The sealing block is fitted with a rubber valve, which is composed of multiple fan-shaped valves spliced ​​together.

[0017] After the top of the sampling tube is raised into the boiler flue, the rubber valve opens under pressure, allowing the fly ash in the boiler flue to enter the sampling tube.

[0018] Preferably, the rubber valve is a composite structure of a metal skeleton and rubber vulcanization, possessing both rigidity and preload. The surface of the rubber valve is coated with a high-temperature resistant coating, which is either tungsten carbide or ceramic, improving the valve's abrasion resistance and high-temperature resistance. The greater the pressure differential, the larger the opening of the rubber valve, resulting in an adaptively larger flow area. Within a certain range, it automatically tends towards "constant velocity intake," matching the flue gas velocity fluctuations within the boiler flue and achieving a self-balancing relationship between "pressure differential, opening, and flow velocity."

[0019] Preferably, the sliding valve includes two slide plates slidably mounted on the top of the sampling port. A positive and negative threaded rod is rotatably mounted on one side of the top of the sampling port, and sliders are threadedly connected to both sides of the positive and negative threaded rods. The sliders are fixedly connected to the slide plates one-to-one. A third guide rod is fixedly mounted on the other side of the top of the sampling port. The third guide rod is slidably connected to the slide plates. The positive and negative threaded rods are driven by a sliding valve motor. An infrared sensor is provided at the top of the sampling tube. The infrared sensor is electrically connected to the sliding valve motor. The distance between the top of the sampling tube and the sliding valve is detected by the infrared sensor. When the distance is less than 1 mm, the sliding valve motor is started, the sliding valve is opened, and a seal is formed between the sampling port and the slide plates.

[0020] The sliding valve motor drives the positive and negative threaded rods to rotate. The positive and negative threaded rods drive the two sliders to move closer or further apart, thereby driving the two sliding plates to move closer or further apart, thus closing or opening the sampling port.

[0021] Preferably, an mounting plate is fixedly installed on the side of the housing, a connecting pipe is slidably inserted into the bypass pipe, electric push rods for pushing the connecting pipe to move are provided on both sides of the bypass pipe, the electric push rods are fixedly installed on the mounting plate by a support rod, an infrared sensor for detecting the dust removal port is provided on the connecting pipe, and the connecting pipe is slidably connected to the dust removal port.

[0022] When dust removal is required, the infrared sensor detects that the connecting pipe is facing the dust removal port, and the electric push rod is activated. The electric push rod pushes the connecting pipe out of the bypass pipe and into the dust removal port. Then the valve is opened to purge and clean the sampling tube.

[0023] Preferably, the bypass pipe and the gas storage tank are connected by a venturi tube to increase the pressure inside the bypass pipe, causing the compressed air released from the gas storage tank to form a high-speed jet to purge and clean the sampling tube. A valve is installed between the bypass pipe and the gas storage tank, and a pressure gauge is installed on the bypass pipe to detect the pressure difference inside the pipe, determine whether a blockage has occurred, and complete the pressure relief. An vent pipe is also installed on the bypass pipe, and a valve is installed on the vent pipe.

[0024] After sampling is completed, the sampling tube is disconnected from the boiler flue, and the valve of the vent pipe is opened. The remaining high-pressure gas and fly ash in the sampling tube can be vented through the bypass pipe to the vent pipe to release the pressure and prevent the rubber valve from being unable to close under high pressure, which could damage the mechanical structure and affect subsequent sampling.

[0025] This invention provides a method for sampling fly ash, characterized by using a fly ash sampling device and including the following steps: S1, start the drive mechanism, the drive mechanism drives the sampling tube to move towards the sampling port; The drive motor drives the drive shaft to rotate, and the drive shaft drives the first lead screw to rotate, causing the threaded block to rise and fall along the first lead screw, which in turn causes the sampling tube to slide up and down along the first guide rod.

[0026] As the threaded block and sampling tube rise and fall, they cause the spline to slide along the spline groove, maintaining the engagement of the first gear with the second gear. That is, the sampling tube rotates while rising and falling.

[0027] S2, the top of the sampling tube enters the sampling port, the sliding valve opens, and the flue gas and fly ash in the boiler flue enter the sampling tube and finally enter the sample container. After sampling is completed, the sample container is removed and sent for testing.

[0028] After the top of the sampling tube enters the sampling port, the distance between the top of the sampling tube and the sliding valve is detected by an infrared sensor. When the distance is less than 1mm, the sliding valve motor starts and drives the positive and negative threaded rods to rotate. The positive and negative threaded rods drive the two sliders to move away from each other, thereby opening the sampling port.

[0029] When the sampling tube rotates, it drives the third gear to rotate through the internal gear ring. The third gear drives the second lead screw to rotate, causing the sealing block to move relative to the sampling tube along the second guide rod.

[0030] After the sealing block enters the boiler flue, the rubber valve opens under pressure, allowing the fly ash in the boiler flue to enter the sampling tube and finally into the sample container. After sampling is completed, the sample container is removed and sent for testing.

[0031] S3, start the drive mechanism, the drive mechanism drives the sampling tube to reset, that is, the sampling tube moves to the position where the connecting pipe is directly opposite the dust removal port, the sliding valve closes, the dust removal port is opened, so that the bypass pipe is connected to the dust removal port, the air tank is opened, and the compressed air in the air tank enters the sampling tube to purge the sampling tube.

[0032] When dust removal is required, the infrared sensor detects that the connecting pipe is facing the dust removal port, and the electric push rod is activated. The electric push rod pushes the connecting pipe out of the bypass pipe and into the dust removal port. Then the valve is opened, and the compressed air released from the air tank forms a high-speed jet to purge and clean the sampling tube.

[0033] Compared with the prior art, the present invention has the following advantages: 1. The sampling tube of this invention is designed as a Venturi tube structure, which creates a negative pressure zone at the top of the sampling tube, enabling constant velocity intake of flue gas and fly ash. A rubber valve is provided at the top of the sampling tube. The greater the pressure difference between the sampling tube and the boiler flue, the larger the opening of the rubber valve, and the greater the flow area. Within a certain range, it automatically tends to "constant velocity intake", matching the flue gas velocity fluctuation in the boiler flue and achieving self-balance of "pressure difference-opening-flow velocity", avoiding fly ash accumulation. When the sliding valve is closed, there is no pressure difference above and below the rubber valve, and it closes automatically, effectively preventing fly ash leakage.

[0034] 2. This invention has a dust removal port on the side of the sampling tube and a bypass pipe on the side of the shell. A connecting pipe is slidably inserted into the bypass pipe. The connecting pipe is connected to the dust removal port by electric push rods on both sides of the bypass pipe. After sampling, the bypass pipe is connected to the dust removal port, instantly eliminating the positive pressure zone and preventing blockage from the source. No manual unblocking is required, which greatly improves work efficiency. The bypass pipe is also connected to an air storage tank, which can be used to clean the sampling tube with compressed air to prevent fly ash from accumulating in the sampling tube and the shell.

[0035] 3. The present invention has a driving mechanism inside the housing to move the sampling tube and drive the top of the sampling tube into the boiler flue. The distance between the top of the sampling tube and the sliding valve is determined by an infrared sensor. The infrared sensor controls the sliding valve motor to drive the slide plate to move, thereby opening or closing the sliding valve, realizing automated sampling and reducing manual operation.

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention.

[0038] Figure 2 This is a schematic diagram of the shell structure in this invention.

[0039] Figure 3 This is a structural schematic diagram of the shell from another perspective in this invention.

[0040] Figure 4 This is a three-dimensional structural diagram of the sampling tube in this invention.

[0041] Figure 5 This is a perspective view of the sampling tube in this invention.

[0042] Figure 6 This is a schematic diagram of the transmission structure of the first lead screw in this invention.

[0043] Figure 7 This is a schematic diagram of the connection between the spline and the spline groove in this invention.

[0044] Figure 8 This is a schematic diagram of the sealing block in this invention.

[0045] Figure 9 This is a schematic diagram of the slide valve in this invention.

[0046] Explanation of reference numerals in the attached figures: Detailed Implementation

[0047] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0049] like Figures 1-9 As shown, the present invention provides a fly ash sampling device, including a housing 1. The top of the housing 1 is connected to a sampling port 201 of a boiler flue 2 via a flange. A sliding valve 3 is provided on one end of the sampling port 201 of the boiler flue 2. A sampling tube 4 is provided inside the housing 1. A driving mechanism 5 for moving the sampling tube 4 is provided between the housing 1 and the sampling tube 4. A cleaning port 6 is provided on the side end of the sampling tube 4. A filter screen and a valve are provided on the cleaning port 6. A bypass pipe 7 communicating with the boiler flue 3 is provided on the side end of the housing 1. A valve is provided between the boiler flue 3 and the bypass pipe 7. A gas storage tank 8 for cleaning is connected to the bypass pipe 7. A sampling port 9 is opened at the bottom end of the housing 1. A valve is provided on the sampling port 9. A sample tank 901 is provided below the sampling port 9.

[0050] The pressure inside the boiler flue 2 is 0.1-0.4 MPa. The drive mechanism 5 can drive the sampling tube 4 into the sampling port 201. After the sliding valve 3 is opened, the fly ash in the boiler flue 2 enters the sampling tube 4 under pressure and finally enters the sample container 901. After a certain period of time, the sampling is completed, the drive mechanism 5 drives the sampling tube 4 to reset, and the sliding valve 3 is closed.

[0051] Open the valve between the gas storage tank 8, the boiler flue 3 and the bypass pipe 7, and introduce compressed air into the sampling pipe 4 to clean the sampling pipe 4 and prevent blockage.

[0052] In this embodiment, the driving mechanism 5 includes a first lead screw 501 vertically rotatably mounted inside the housing 1, a threaded block 5011 threaded onto the first lead screw 501, a first guide rod 502 vertically fixedly mounted inside the housing 1, a guide block 5021 slidably mounted on the first guide rod 502, the threaded block 5011 and the guide block 5021 being fixedly connected to the sampling tube 4, a drive box fixedly mounted on the outer side of the housing 1, a drive shaft 503 rotatably mounted inside the drive box via bearings, the drive shaft 503 and the first lead screw 501 being drivenly connected via a bevel gear set, the drive shaft 503 and the first lead screw 501 being fixedly mounted with meshing bevel gears, and a drive motor 5031 being drivenly connected to the outer end of the drive shaft 503.

[0053] The drive motor 5031 drives the drive shaft 503 to rotate, and the drive shaft 503 drives the first lead screw 501 to rotate, causing the threaded block 5011 to rise and fall along the first lead screw 501, which in turn drives the sampling tube 4 to slide up and down along the first guide rod 502.

[0054] In this embodiment, a rotating shaft 504 is vertically rotatably installed inside the housing 1. The rotating shaft 504 is connected to the first lead screw 501 through a gear set. A first gear 401 is fixedly installed on the sampling tube 4. A second gear 5041 is provided on the rotating shaft 504. The second gear 5041 is limited and installed on the threaded block 5011. The rotating shaft 504 passes through the threaded block 5011. The first gear 401 and the second gear 5041 mesh.

[0055] The rotating shaft 504 can rotate with the first lead screw 501, driving the second gear 5041 to rotate, causing the first gear 401 and the sampling tube 4 to rotate.

[0056] The rotating shaft 504 has spline grooves 5042 evenly distributed on its circumference, and a spline 5043 is fixedly installed on the inner hole of the second gear 5041. The spline 5043 and the spline groove 5042 are slidably connected in a one-to-one correspondence.

[0057] As the threaded block 5011 and the sampling tube 4 move up and down, the spline 5043 slides along the spline groove 5042, maintaining the engagement of the second gear 5041 with the first gear 401. That is, the sampling tube 4 rotates while moving up and down.

[0058] In this embodiment, the top end of the sampling tube 4 is a Venturi tube structure, which creates a negative pressure zone at the top of the sampling tube 4, enabling the constant velocity intake of flue gas and fly ash. An internal gear ring 402 is fixedly installed inside the top end of the sampling tube 4, and a sealing block 403 is slidably installed inside the top end of the sampling tube 4. A second guide rod 404, slidably connected to the sealing block 403, is vertically installed at the bottom end of the flange. A second lead screw 405 is vertically rotatably installed at the bottom end of the flange, and the second lead screw 405 is threadedly connected to the sealing block 403. A third gear 406, meshing with the internal gear ring 402, is fixedly installed at the bottom end of the second lead screw 405.

[0059] When the sampling tube 4 rotates, it drives the third gear 406 to rotate through the internal gear ring 402. The third gear 406 drives the second lead screw 405 to rotate, so that the sealing block 403 moves relative to the sampling tube 4 along the second guide rod 404, which can play a certain cleaning effect on the inlet end of the sampling tube 4. The inlet end of the sampling tube 4 is the top end, and the outlet end of the sampling tube 4 is the bottom end.

[0060] The sealing block 403 is fitted with a rubber valve 407, which is composed of multiple fan-shaped valves spliced ​​together.

[0061] After the top of the sampling tube 4 is raised into the boiler flue 2, the rubber valve 407 opens under pressure, allowing the fly ash in the boiler flue 2 to enter the sampling tube 4.

[0062] In this embodiment, the rubber valve 407 is a composite structure of a metal skeleton and rubber vulcanization, possessing both rigidity and preload. The surface of the rubber valve 407 is coated with a high-temperature resistant coating, which is either tungsten carbide or ceramic, improving the valve's abrasion resistance and high-temperature resistance. The greater the pressure difference, the larger the opening of the rubber valve 407, resulting in an adaptively larger flow area. Within a certain range, it automatically tends towards "constant velocity intake," matching the flue gas velocity fluctuations within the boiler flue duct 2 and achieving a self-balancing relationship between "pressure difference, opening, and flow velocity."

[0063] In this embodiment, the sliding valve 3 includes two sliding plates 301 slidably mounted on the top of the sampling port 201. A positive and negative threaded rod 202 is rotatably mounted on one side of the top of the sampling port 201. Slider 203s are threadedly connected to both sides of the positive and negative threaded rod 202. The slider 203s are fixedly connected to the sliding plates 301 in a one-to-one correspondence. A third guide rod 204 is fixedly mounted on the other side of the top of the sampling port 201. The third guide rod 204 is slidably connected to the sliding plate 301. The positive and negative threaded rod 202 is driven by a sliding valve motor. An infrared sensor is provided at the top of the sampling tube 4. The infrared sensor is electrically connected to the sliding valve motor. The distance between the top of the sampling tube 4 and the sliding valve is detected by the infrared sensor. When the distance is less than 1mm, the sliding valve motor is started, opening the sliding valve 3, and sealing is performed between the sampling port 201 and the sliding plate 301.

[0064] The sliding valve motor drives the positive and negative threaded rods 202 to rotate. The positive and negative threaded rods 202 drive the two sliders 203 to move closer or further apart, and drive the two slide plates 301 to move closer or further apart, thereby closing or opening the sampling port 201.

[0065] In this embodiment, an mounting plate 701 is fixedly installed on the side of the housing 1, a connecting pipe 702 is slidably inserted into the bypass pipe 7, and electric push rods 703 for pushing the connecting pipe 702 to move are provided on both sides of the bypass pipe 7. The electric push rods 703 are fixedly installed on the mounting plate 701 by support rods. An infrared sensor for detecting the dust removal port 6 is provided on the connecting pipe 702, and the connecting pipe 702 is slidably connected to the dust removal port 6.

[0066] When dust removal is required, the infrared sensor detects that the connecting pipe 702 is facing the dust removal port 6, and the electric push rod 703 is activated. The electric push rod 703 pushes the connecting pipe 702 out of the bypass pipe 7 and inserts it into the dust removal port 6. Then the valve is opened to purge and clean the sampling tube 4.

[0067] In this embodiment, the bypass pipe 7 and the gas storage tank 8 are connected by a venturi tube, increasing the pressure inside the bypass pipe 7 and causing the compressed air released from the gas storage tank 8 to form a high-speed jet to purge and clean the sampling pipe 4. When the dust removal port 6 is not connected to the bypass pipe 7, the compressed air released from the gas storage tank 8 can also purge the inside of the housing 1. A valve is provided between the bypass pipe 7 and the gas storage tank 8. A pressure gauge is provided on the bypass pipe 7 to detect the pressure difference inside the pipe, determine whether a blockage has occurred, and complete the pressure relief. An vent pipe is also provided on the bypass pipe 7, and a valve is provided on the vent pipe.

[0068] After sampling is completed, the sampling tube 4 is disconnected from the boiler flue 2, and the valve of the vent pipe is opened. The residual high-pressure gas and fly ash in the sampling tube 4 can be vented through the bypass pipe 7 to the vent pipe to release the pressure and prevent the rubber valve 407 from being unable to close under high pressure, which would damage the mechanical structure and affect subsequent sampling.

[0069] This invention provides a fly ash sampling method using the fly ash sampling device described above, comprising the following steps: S1, start the drive mechanism 5, the drive mechanism 5 drives the sampling tube 4 to move toward the sampling port 201; The drive motor 5031 drives the drive shaft 503 to rotate, and the drive shaft 503 drives the first lead screw 501 to rotate, causing the threaded block 5011 to rise and fall along the first lead screw 501, which in turn drives the sampling tube 4 to slide up and down along the first guide rod 502.

[0070] As the threaded block 5011 and the sampling tube 4 move up and down, the spline 5043 slides along the spline groove 5042, maintaining the engagement of the second gear 5041 with the first gear 401. That is, the sampling tube 4 rotates while moving up and down.

[0071] S2, the top of the sampling tube 4 enters the sampling port 201, the sliding valve 3 is opened, the flue gas and fly ash in the boiler flue 2 enter the sampling tube 4, and finally enter the sample container 901. After sampling is completed, the sample container 901 is removed and sent for testing.

[0072] After the top of the sampling tube 4 enters the sampling port 201, the distance between the top of the sampling tube 4 and the sliding valve is detected by the infrared sensor. When the distance is less than 1mm, the sliding valve motor starts and drives the positive and negative threaded rods 202 to rotate. The positive and negative threaded rods 202 drive the two sliders 203 to move away from each other, and drive the two sliding plates 301 to move away from each other, thereby opening the sampling port 201.

[0073] When the sampling tube 4 rotates, it drives the third gear 406 to rotate through the internal gear ring 402. The third gear 406 drives the second lead screw 405 to rotate, so that the sealing block 403 moves relative to the sampling tube 4 along the second guide rod 404.

[0074] After the sealing block 403 enters the boiler flue 2, the rubber valve 407 opens under pressure, allowing the fly ash in the boiler flue 2 to enter the sampling tube 4 and finally into the sample container 901. After sampling is completed, the sample container 901 is removed and sent for testing.

[0075] S3, start the drive mechanism 5, drive the sampling tube 4 to reset, that is, move the sampling tube 4 to the position where the connecting pipe 702 is directly opposite the cleaning port 6, the sliding valve 3 is closed, the cleaning port 6 is opened, so that the bypass pipe 7 is connected to the cleaning port 6, the air tank 8 is opened, and the compressed air in the air tank 8 enters the sampling tube 4 to purge the sampling tube 4.

[0076] When dust removal is required, the infrared sensor detects that the connecting pipe 702 is facing the dust removal port 6, and the electric push rod 703 is activated. The electric push rod 703 pushes the connecting pipe 702 out of the bypass pipe 7 and inserts it into the dust removal port 6. Then the valve is opened, and the compressed air released by the air tank 8 forms a high-speed jet to purge and clean the sampling pipe 4.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A fly ash sampling device, characterized in that, The device includes a housing (1), the top of which is connected to the sampling port (201) of the boiler flue (2) via a flange. A sliding valve (3) is provided at one end of the sampling port (201) in the boiler flue (2). A sampling tube (4) is provided inside the housing (1). A driving mechanism (5) for moving the sampling tube (4) is provided between the housing (1) and the sampling tube (4). A cleaning port (6) is provided on the side of the sampling tube (4). A filter screen and a valve are provided on the cleaning port (6). A bypass pipe (7) connected to the boiler flue (2) is provided on the side of the housing (1). A valve is provided between the boiler flue (2) and the bypass pipe (7). A gas storage tank (8) for cleaning is connected to the bypass pipe (7). A sampling port (9) is opened at the bottom of the housing (1). A valve is provided on the sampling port (9). A sample container (901) is provided below the sampling port (9).

2. The fly ash sampling device according to claim 1, characterized in that, The drive mechanism (5) includes a first lead screw (501) that is vertically rotatably installed inside the housing (1). A threaded block (5011) is threaded onto the first lead screw (501). A first guide rod (502) is vertically fixed inside the housing (1). A guide block (5021) is slidably installed on the first guide rod (502). The threaded block (5011) and the guide block (5021) are fixedly connected to the sampling tube (4). A drive box is fixedly installed on the outside of the housing (1). A drive shaft (503) is rotatably installed inside the drive box via a bearing. The drive shaft (503) is connected to the first lead screw (501) via a bevel gear set. A drive motor (5031) is connected to the outer end of the drive shaft (503).

3. The fly ash sampling device according to claim 2, characterized in that, A rotating shaft (504) is vertically rotatably installed inside the housing (1). The rotating shaft (504) is connected to the first lead screw (501) through a gear set. A first gear (401) is fixedly installed on the sampling tube (4). A second gear (5041) is provided on the rotating shaft (504). The second gear (5041) is limited and installed on the threaded block (5011). The rotating shaft (504) passes through the threaded block (5011). The first gear (401) meshes with the second gear (5041). The rotating shaft (504) has evenly spaced spline grooves (5042) on its circumference, and a spline (5043) is fixedly installed on the inner hole of the second gear (5041). The spline (5043) and the spline groove (5042) are slidably connected in a one-to-one correspondence.

4. The fly ash sampling device according to claim 3, characterized in that, The top end of the sampling tube (4) is a Venturi tube structure. An internal gear ring (402) is fixedly installed inside the top end of the sampling tube (4). A sealing block (403) is slidably installed inside the top end of the sampling tube (4). A second guide rod (404) that is slidably connected to the sealing block (403) is vertically installed at the bottom end of the flange. A second lead screw (405) is vertically rotatably installed at the bottom end of the flange. The second lead screw (405) is threadedly connected to the sealing block (403). A third gear (406) that meshes with the internal gear ring (402) is fixedly installed at the bottom end of the second lead screw (405). The sealing block (403) is fitted with a rubber valve (407), which is composed of multiple fan-shaped valves spliced ​​together.

5. A fly ash sampling device according to claim 4, characterized in that, The rubber valve (407) is a composite structure of metal skeleton and rubber vulcanization, and the surface of the rubber valve (407) is coated with a high-temperature resistant coating.

6. The fly ash sampling device according to claim 1, characterized in that, The sliding valve (3) includes two sliding plates (301) slidably mounted on the top of the sampling port (201). A positive and negative threaded rod (202) is rotatably mounted on one side of the top of the sampling port (201). A slider (203) is threadedly connected to both sides of the positive and negative threaded rod (202). The slider (203) is fixedly connected to the sliding plate (301) in a one-to-one correspondence. A third guide rod (204) is fixedly mounted on the other side of the top of the sampling port (201). The third guide rod (204) is slidably connected to the sliding plate (301).

7. The fly ash sampling device according to claim 6, characterized in that, The positive and negative threaded rod (202) is connected to a sliding valve motor. An infrared sensor is installed at the top of the sampling tube (4). The infrared sensor is electrically connected to the sliding valve motor. The sampling port (201) and the slide plate (301) are sealed.

8. The fly ash sampling device according to claim 1, characterized in that, An mounting plate (701) is fixedly installed on the side of the housing (1). A connecting pipe (702) is slidably inserted into the bypass pipe (7). Electric push rods (703) for pushing the connecting pipe (702) are provided on both sides of the bypass pipe (7). The electric push rods (703) are fixedly installed on the mounting plate (701) by a support rod. An infrared sensor for detecting the dust removal port (6) is provided on the connecting pipe (702). The connecting pipe (702) is slidably connected to the dust removal port (6).

9. A fly ash sampling device according to claim 1, characterized in that, The bypass pipe (7) and the gas storage tank (8) are connected by a venturi pipe. A valve is provided between the bypass pipe (7) and the gas storage tank (8). A drain pipe is also provided on the bypass pipe (7), and a valve is provided on the drain pipe.

10. A method for sampling fly ash, characterized in that, Using the fly ash sampling device as described in any one of claims 1 to 9 includes the following steps: S1, start the drive mechanism (5), the drive mechanism (5) drives the sampling tube (4) to move towards the sampling port (201); S2, the top of the sampling tube (4) enters the sampling port (201), the sliding valve (3) is opened, the flue gas and fly ash in the boiler flue (2) enter the sampling tube (4), and finally enter the sample container (901). After the sampling is completed, the sample container (901) is removed and sent for testing. S3, start the drive mechanism (5), drive the sampling tube (4) to reset, the sliding valve (3) closes, open the cleaning port (6), make the bypass pipe (7) connect to the cleaning port (6), open the air tank (8), the compressed air in the air tank (8) enters the sampling tube (4) to purge the sampling tube (4).

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