Automated limestone sampling device and its usage method for desulfurization systems in thermal power plants

Abstract

This invention discloses an automated limestone sampling device and its usage method for desulfurization systems in thermal power plants. Limestone transported by truck is unloaded into a limestone pit hopper, then transferred via a vibrating feeder, bucket elevator, and sliding pipe to a limestone storage hopper for use in the desulfurization system. The limestone sampling device is mounted on the sliding pipe and powered by a cylinder. During sampling, its actuator extends into the sliding pipe, cutting off the entire flow area for sampling. After sampling, the actuator is pulled out, and the collected sample is transferred by a scraper to a collection pipe, where it is collected by a sample collection bucket. This invention achieves mechanized, automated, and uniform limestone sampling in thermal power plant desulfurization systems, solving the problems of high cost, poor sample representativeness, and the risk of fraud associated with manual sampling.

Description

Technical Field

[0001] This invention belongs to the technical field of desulfurization systems in thermal power plants, specifically an automated limestone sampling device and its usage method for desulfurization systems in thermal power plants. Background Technology

[0002] Implementing ultra-clean emissions in thermal power plants is an important measure to promote the construction of high-standard ecological civilization in my country. SO2, as a significant component of gaseous pollutants, has always been a strictly controlled emission indicator for thermal power plants. Limestone-gypsum wet flue gas desulfurization technology, with its high efficiency, stability, maturity, and zero waste, occupies a dominant position in flue gas desulfurization technology for thermal power plants. Limestone is the raw material for limestone-gypsum wet flue gas desulfurization technology and is a major bulk material procured by thermal power plants. Limestone raw materials purchased by thermal power plants are transported to the plant by truck. After arrival, on-duty personnel need to climb onto the roof of the truck and use a sampling shovel to dig samples from multiple points inside the truck bed, or sample each truckload from the limestone unloading pit hopper. This sampling technique has serious defects and shortcomings. First, the depth of manual limestone digging is limited, the sampling is uneven, and the sample representativeness is poor. Second, sampling on the truck requires working at height, which poses safety risks. Third, manual sampling is susceptible to personnel fraud. Fourth, the large volume of limestone purchased and the number of transport vehicles mean that manual sampling seriously encroaches on manpower and is costly. Therefore, it is necessary to invent an automated, mechanized, and uniform limestone sampling device for the desulfurization system of thermal power plants. Summary of the Invention

[0003] In view of the above-mentioned technical problems, an automated limestone sampling device for desulfurization systems in thermal power plants and its usage method are provided.

[0004] The technical means employed in this invention are as follows:

[0005] An automated limestone sampling device for desulfurization systems in thermal power plants includes a limestone unloading sump hopper, a vibrating feeder, a bucket elevator, a limestone sampling device, a material conveying pipe, a limestone storage hopper, a sampling pipe, and a sampling bucket. The outlet of the limestone unloading sump hopper is connected to the inlet of the vibrating feeder, the outlet of the vibrating feeder is connected to the inlet of the bucket elevator, and the outlet of the bucket elevator is connected to the inlet of the material conveying pipe. The bucket elevator is used to raise the limestone raw material to a higher level, transferring the limestone raw material from the vibrating feeder to the material conveying pipe. The outlet of the material conveying pipe... The limestone is connected to the limestone storage hopper; the limestone sampling device is installed on the sliding pipe, the sampling bucket is located on the upper end face of the limestone pit hopper, and the sampling tube is located between the limestone sampling device and the sampling bucket; after the limestone raw material is unloaded into the limestone unloading pit hopper, it is transferred to the limestone storage hopper via the vibrating feeder, the bucket elevator, and the sliding pipe; during the limestone transfer process, the limestone sampling device performs full-range sampling inside the sliding pipe, and the collected limestone samples are collected by the sampling bucket after passing through the sampling tube.

[0006] Preferably, a sampling port is provided on one side wall of the material tube, and a first gate valve is provided at the sampling port to open and close the sampling port.

[0007] The limestone sampling device includes an actuator, a fixing mechanism, and a driving mechanism;

[0008] The fixing mechanism is used to install the actuator and the drive mechanism, and the fixing mechanism is fixedly connected to the sliding tube and is located near the sampling port;

[0009] The driving mechanism is used to drive the actuator to enter and exit the material tube through the sampling port;

[0010] The actuator is used to take a sample and transfer the sample to the sample collection tube.

[0011] Preferably, the fixing mechanism includes a fixing support plate fixedly connected to the sliding tube, and the fixing support plate is provided with a grid and a scraper;

[0012] The actuator includes an L-shaped sampling plate, a cover plate, and a flipping mechanism that drives the cover plate to flip.

[0013] The horizontal portion of the L-shaped sampling plate is located between the grid and the scraper. The end of the vertical portion of the L-shaped sampling plate is hinged to the cover plate via a first hinge axis, and the first hinge axis is perpendicular to the plane where the horizontal portion of the L-shaped sampling plate is located. The flipping mechanism connects the cover plate and the vertical portion of the L-shaped sampling plate and is used to drive the cover plate to flip around the first hinge axis.

[0014] The driving mechanism includes a first cylinder mounted on the fixed plate, and the output end of the first cylinder is fixedly connected to the vertical part of the L-shaped sampling plate through a fixed bracket.

[0015] Preferably, the flipping mechanism includes a slide rail and a second cylinder fixed on the vertical part of the L-shaped sampling plate. The output end of the second cylinder is connected to one end of a pull rod located in the slide rail. The other end of the pull rod is hinged to one end of a straight pull rod, and the other end of the straight pull rod is hinged to one end of an arc-shaped pull rod. The other end of the arc-shaped pull rod is fixedly connected to the cover plate. The second cylinder drives the pull rod, the straight pull rod, the arc-shaped pull rod, and the cover plate to move, so that the cover plate rotates around the first hinge axis within the range of 0 to 90°.

[0016] Preferably, the slide has semi-circular grooves on its two inner walls, the end of the pull rod away from the second cylinder has a ring, the ring is fitted around the middle of the ball bearing connecting rod, the two ends of the ball bearing connecting rod have ball bearings, the ball bearings are located in the semi-circular grooves, and the end of the straight pull rod is rotatably connected to the ball bearing connecting rod.

[0017] Preferably, the arc-shaped connecting rod includes an arc-shaped segment and a straight segment. One end of the straight segment is fixedly connected to the cover plate, and the other end of the straight segment is fixedly connected to one end of the arc-shaped segment. The other end of the arc-shaped segment is hinged to the end of the straight pull rod.

[0018] Preferably, the top of the limestone storage hopper has an atmospheric communication pipe, and the bottom of the limestone storage hopper has a second gate valve.

[0019] Preferably, the upper surface of the limestone unloading pit hopper has a filter grate, the bottom of the limestone unloading pit hopper has a third baffle valve, and the sample collection bucket is placed on the filter grate.

[0020] Preferably, the material conveying pipe is inclined, and the outlet of the bucket elevator is higher than the top of the limestone storage hopper.

[0021] This invention also discloses a method for using an automated limestone sampling device in a thermal power plant desulfurization system, comprising:

[0022] After the limestone raw material is unloaded into the limestone unloading pit hopper, it is transferred to the limestone storage hopper via the vibrating feeder, the bucket elevator, and the sliding pipe.

[0023] When no sampling is being performed, the first gate valve closes the sampling port, the actuator is located outside the sliding tube, and the plane of the cover plate coincides with the plane of the vertical part of the L-shaped sampling plate;

[0024] During sampling, the first gate valve opens the sampling port, the first cylinder drives the actuator to enter the sliding tube; and the second cylinder drives the plane of the cover plate to be perpendicular to the plane of the vertical part of the L-shaped sampling plate.

[0025] After sampling, the first cylinder drives the actuator back to the outside of the material tube, the first insert valve closes the sampling port, the scraper scrapes the sample off the L-shaped sampling plate, and collects it in the collection tank through the grid and the collection tube. After the cover plate touches the scraper, the second cylinder drives the plane of the cover plate to coincide with the plane of the vertical part of the L-shaped sampling plate, completing one sampling cycle. The sampling action is repeated once every set time interval.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The present invention relates to an automated limestone sampling device for a desulfurization system in a thermal power plant, comprising a limestone unloading pit hopper, a vibrating feeder, a bucket elevator, a sliding pipe, a sampling device, a limestone storage hopper, a sample collection pipe, and a sample collection bucket. The limestone sampling device is arranged on the sliding pipe and includes an actuator and a fixing mechanism, powered by a cylinder. When not sampling, the actuator is located outside the sliding pipe; during sampling, the actuator extends into the sliding pipe, ensuring the independence of the sampling device and the limestone transfer system. During sampling, the actuator cuts off the entire flow area of ​​the sliding pipe to collect samples, collecting samples every 90 seconds to ensure the uniformity and representativeness of the samples. The present invention achieves automated, mechanized, and uniform limestone sampling. The sampling device is simple, efficient, and has no easily worn parts, solving the problems of high cost, uneven sampling, and poor sample representativeness of manual sampling, while avoiding the risks of manual sampling at heights and personnel fraud.

[0028] Based on the above reasons, this invention can be widely promoted in fields such as desulfurization systems in thermal power plants. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an automated limestone sampling device for a desulfurization system in a thermal power plant, as described in a specific embodiment of the present invention.

[0031] Figure 2This is a schematic diagram of the limestone sampling device in a specific embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram showing the movement of the actuator cover plate at 0°, 45°, and 90° in a specific embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the actuator structure in a specific embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the straight connecting rod and the arc-shaped connecting rod in a specific embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the slide and tie rod structure in a specific embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the fixing mechanism in a specific embodiment of the present invention.

[0037] Figure 8 This is a schematic diagram of the limestone unloading pit hopper structure in a specific embodiment of the present invention.

[0038] Figure 9 This is a schematic diagram of the limestone storage hopper structure in a specific embodiment of the present invention.

[0039] Figure 10 This is a schematic diagram of the sample collection tube structure in a specific embodiment of the present invention.

[0040] Figure 11 This is a schematic diagram of the sample collection bucket structure in a specific embodiment of the present invention.

[0041] In the diagram: 1. Limestone unloading pit hopper; 2. Vibrating feeder; 3. Bucket elevator; 4. Limestone sampling device; 5. Sliding pipe; 6. Limestone storage hopper; 7. Sampling pipe; 8. Sampling bucket; 9. L-shaped sampling plate; 10. Cover plate; 11. First hinge shaft; 12. Arc-shaped connecting rod; 13. Second pin shaft; 14. Straight tie rod; 15. Second cylinder; 16. First cylinder; 17. Fixed bracket; 18. Mounting frame; 19. Tie rod; 20. Slide rail; 21. Second fixed base; 22. Straight section; 23. Third fixed base; 24. Fourth fixed base; 25. Straight rod section; 26. Arc-shaped section; 27. Sixth fixed base; 28. Fourth fixed base; 29. ​​Fifth fixed base; 30. First fixed base; 31. First square tube; 32 33. Second square tube; 34. Cylindrical section; 35. First rolling ball; 36. Second rolling ball; 37. Ring; 38. Rolling ball connecting rod; 39. First gate valve; 40. L-shaped fixing plate; 41. Connecting pipe; 42. Receiving groove; 43. Slide groove; 44. Fixed support plate; 45. Horizontal plate; 46. Vertical plate; 47. Grille; 48. Scraper; 49. Filter grate; 50. Pit hopper square tube section; 51. Third gate valve; 52. Pit hopper flange; 53. Atmospheric connecting pipe; 54. Storage hopper square tube section; 55. Storage hopper flange; 56. Storage hopper cylindrical section; 57. Second gate valve; 58. Sample collection cylindrical section; 59. Frustum section; 60. First vertical cylindrical section; 61. Inclined cylindrical section; 62. Second vertical cylindrical section. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0049] like Figures 1-11 As shown, an automated limestone sampling device is used in the desulfurization system of a thermal power plant, such as... Figure 1 As shown, the system includes a limestone unloading pit hopper 1, a vibrating feeder 2, a bucket elevator 3, a limestone sampling device 4, a material conveying pipe 5, a limestone storage hopper 6, a sampling pipe 7, and a sampling bucket 8. The outlet of the limestone unloading pit hopper 1 is connected to the inlet of the vibrating feeder 2, the outlet of the vibrating feeder 2 is connected to the inlet of the bucket elevator 3, and the outlet of the bucket elevator 3 is connected to the inlet of the material conveying pipe 5. The bucket elevator 3 is used to raise the limestone raw material to its height, transferring it from the vibrating feeder 2 to the material conveying pipe 5. The outlet of the material conveying pipe 5 is connected to the limestone storage hopper 6. The limestone sampling device 4 is installed on the sliding pipe 5, the sample collection bucket 8 is located on the upper end face of the limestone pit hopper 1, and the sample collection pipe 7 is located between the limestone sampling device 4 and the sample collection bucket 8. After the limestone raw material is unloaded into the limestone unloading pit hopper 1, it is transferred to the limestone storage hopper 6 via the vibrating feeder 2, the bucket elevator 3, and the sliding pipe 5. During the limestone transfer process, the limestone sampling device 4 performs full-range sampling inside the sliding pipe 5, and the collected limestone samples are collected by the sample collection bucket 8 after passing through the sample collection pipe 7.

[0050] like Figure 8As shown, the upper surface of the limestone unloading pit hopper 1 is a filter grate 48; the filter grate 48 is used to prevent large debris in the limestone raw material from falling into the limestone unloading pit hopper 1; the bottom of the limestone unloading pit hopper 1 is connected to a square pit hopper section 49; a third slide valve 50 is arranged on the pit hopper section 49; the third slide valve 50 includes four cylinders and adopts an operating mode of opening on opposite sides simultaneously; a pit hopper flange 51 is arranged at the end of the pit hopper section 49 away from the limestone unloading pit hopper 1.

[0051] The vibrating feeder 2 is arranged at the bottom of the limestone unloading pit hopper 1; the inlet flange of the vibrating feeder 2 and the pit hopper flange 51 of the limestone unloading pit hopper 1 are arranged in pairs to connect and communicate the limestone unloading pit hopper 1 and the vibrating feeder 2; the vibrating feeder 2 is used to transfer limestone raw materials from the pit hopper 1 to the bucket elevator 3.

[0052] The inlet flange of the bucket elevator 3 and the outlet flange of the vibrating feeder 2 are arranged in pairs to connect the bucket elevator 3 and the vibrating feeder 2; the bucket elevator 3 is used to lift the limestone raw material to the height and transfer the limestone raw material from the vibrating feeder 2 to the sliding pipe 5.

[0053] The material conveying pipe 5 shown includes an inclined section and a vertical section. The upper end of the inclined section is connected to the outlet of the bucket elevator 3 by welding. The lower end of the inclined section is connected to the top of the vertical section. The included angle between the inclined section and the vertical section is 150°. The bottom of the vertical section is connected to the top of the limestone storage hopper 6 through a flange.

[0054] like Figure 9 As shown, the top of the limestone storage hopper 6 has a square tube section 53 and an atmospheric connection pipe 52. A storage hopper flange 54 is installed on the square tube section 53, and the storage hopper flange 54 cooperates with the flange at the bottom of the vertical part. The atmospheric connection pipe 52 includes a vertical square tube section and a semi-circular square tube section, which is used to connect the limestone storage hopper 6 with the air, thereby ensuring that the limestone falls smoothly from the limestone storage hopper 6. The bottom of the limestone storage hopper 6 is arranged with a cylindrical section 55 of the storage hopper with a pipe wall structure. A second slide valve 56 is arranged on the cylindrical section 55 of the storage hopper. The second slide valve 56 includes four cylinders and adopts an operating mode of simultaneous opening on both sides.

[0055] like Figure 10As shown, the sample collection tube 7 is arranged between the limestone sampling device 4 and the sample collection bucket 8, and is used to transfer the limestone sample collected by the limestone sampling device 4 to the sample collection bucket 8; the sample collection tube 7 has a pipe wall structure and a sample collection cylindrical section 57 is vertically arranged at the lower part of the grid 46; the sample collection cylindrical section 57 is connected in sequence to the frustum section 58, the first vertical cylindrical section 59, the inclined cylindrical section 60 and the second vertical cylindrical section 61; the sample collection bucket 8 is arranged on the filter grate 48 of the limestone unloading pit hopper 1; the second vertical cylindrical section 61 is arranged coaxially with the sample collection bucket 8.

[0056] like Figure 2 As shown, the inclined portion of the sliding tube 5 is connected at both ends by a connecting tube 40, and the connecting tube 40 has the same cross-section as the inclined portion of the sliding tube 5. A sampling port is provided on one side wall of the connecting tube 40, and a first slide valve 38 is provided at the sampling port to open and close the sampling port. The first slide valve 38 is fixed to the upper surface of the connecting tube 40 by an L-shaped fixing plate 39. The vertical part of the L-shaped fixing plate 39 is fixedly connected to the upper surface of the connecting tube 40. The first slide valve 38 has two cylinders that drive the valve plate to rise and fall. The mounting end of the cylinder is fixed to the horizontal part of the L-shaped fixing plate. A slide groove 42 that cooperates with the first slide valve 38 is provided at the sampling port.

[0057] The limestone sampling device 4 includes an actuator, a fixing mechanism, and a driving mechanism;

[0058] The fixing mechanism is used to install the actuator and the driving mechanism, and the fixing mechanism is fixedly connected to the connecting pipe 40 and close to the sampling port; the driving mechanism is used to drive the actuator to enter and exit the connecting pipe 40 from the sampling port; the actuator is used to take a sample and transfer the sample to the sample collection tube 7.

[0059] The fixing mechanism includes a fixing support plate 43 fixedly connected to the connecting pipe 40. The fixing support plate 43 includes a grid 46, a horizontal plate 44, and a vertical plate 45. The width of the horizontal plate 44 is half the width of the grid 46. A scraper 47 is arranged on the upper end face of the grid 46. The scraper 47 is arranged at a 30° angle with the vertical plate 45.

[0060] The actuator includes an L-shaped sampling plate 9, a cover plate 10, and a flipping mechanism for driving the cover plate 10 to flip. The horizontal portion of the L-shaped sampling plate 9 is located between the grid 46 and the scraper 47. The end of the vertical portion of the L-shaped sampling plate 9 is hinged to the cover plate 10 via a first hinge shaft 11 and a first fixed base 30, and the first hinge shaft 11 is perpendicular to the plane where the horizontal portion of the L-shaped sampling plate 9 is located. The flipping mechanism connects the cover plate 10 and the vertical portion of the L-shaped sampling plate 9 and is used to drive the cover plate 10 to flip around the first hinge shaft 11.

[0061] The horizontal length of the L-shaped sampling plate 9 is longer than the side length of the square cross-section of the sliding tube 5, and the vertical part of the L-shaped sampling plate 9 is at the same height as the flow height of the sliding tube 5, thereby cutting off the entire flow area of ​​the sliding tube 5 for sampling, ensuring the uniformity of sampling and the representativeness of the sample.

[0062] The driving mechanism includes a first cylinder 16, and the vertical plate 45 is used to fix the mounting end of the first cylinder 16. The first cylinder 16 is placed on a horizontal plate 44. The output end of the first cylinder 16 is fixedly connected to the vertical part of the L-shaped sampling plate 9 through a fixing bracket 17.

[0063] The flipping mechanism includes a slide 20 and a second cylinder 15 fixed on the vertical part of the L-shaped sampling plate 9. The mounting end of the second cylinder 15 is connected to the vertical part of the L-shaped sampling plate 9 through a mounting bracket 18. The slide 20 is formed by a first square tube 31 and a second square tube 32. The inner walls of the first square tube 31 and the second square tube 32 are respectively provided with semi-circular grooves.

[0064] The output end of the second cylinder 15 is connected to one end of the pull rod 19 located in the slide 20. The pull rod 19 includes a cylindrical section 33, a ring 36, a first rolling ball 34, a second rolling ball 35, and a rolling ball connecting rod 37. The cylindrical end 33 away from the second cylinder 15 has a ring 36. The ring 36 is sleeved outside the middle of the rolling ball connecting rod 37. The two ends of the rolling ball connecting rod 37 have a first rolling ball 34 and a second rolling ball 35, respectively. The first rolling ball 34 and the second rolling ball 35 are respectively located in the semi-circular groove.

[0065] The end of the pull rod 19 away from the second cylinder 15 is hinged to one end of the straight pull rod 14. The straight connecting rod 14 includes a second fixed base 21, a straight section 22, a third fixed base 23, and a fourth fixed base 24. The second fixed base 21, the third fixed base 23, and the fourth fixed base 24 have a circular hole structure at their center. The second fixed base 21 is located at one end of the straight section 22, and the third fixed base 23 and the fourth fixed base 24 are arranged in pairs at intervals at the other end of the straight section 22. The third fixed base 23 and the fourth fixed base 24 are hinged in cooperation with the ball bearing connecting rod 37.

[0066] The straight pull rod 14 is hinged to the arc-shaped connecting rod 12 at one end away from the pull rod 19; the arc-shaped connecting rod 12 includes an arc-shaped segment 26 and a straight rod segment 25; a fourth fixed base 28 and a fifth fixed base 29 are arranged at the end of the arc-shaped segment 26 away from the straight rod segment 25; the fourth fixed base 28 and the fifth fixed base 29 are arranged in pairs at intervals, and both have a circular hole structure at the center; a sixth fixed base 27 is arranged at the end of the straight rod segment 25 away from the arc-shaped segment 26; the second fixed base 21 of the straight connecting rod 14 is inserted between the fourth fixed base 28 and the fifth fixed support 29 of the arc-shaped connecting rod 12 and is connected by a second pin 13; the connecting pipe 40 has a receiving groove 41 on its side wall away from the actuator for accommodating the arc-shaped segment 26 of the arc-shaped connecting rod 12. The center of the sixth fixed base 27 is a circular hole structure; the sixth fixed base 27 of the arc-shaped connecting rod 12 is inserted between two fixed bases arranged at intervals on the cover plate 10 and locked with a fixing pin.

[0067] The height of the cover plate 10 is 2 / 3 of the width of the horizontal part of the L-shaped sampling plate 9; seven of the above-mentioned first fixing bases 30 are arranged at intervals on the side of the cover plate 10 connected to the vertical part of the L-shaped sampling plate 9, and the center of the first fixing base 30 is a circular hole structure; the cross section of the end of the cover plate 10 away from its fixing base is a right triangle; two of the above-mentioned fixing bases are arranged at intervals on the side of the cover plate 10 away from the L-shaped sampling plate 9, and the center of the fixing base is a circular hole structure;

[0068] The second cylinder 15 drives the pull rod 19, the straight pull rod 14, the arc-shaped pull rod 12 and the cover plate 10 to move, so that the cover plate 10 rotates around the first hinge axis 11 in the range of 0 to 90°.

[0069] The method of using the automated limestone sampling device for desulfurization systems in thermal power plants includes:

[0070] The limestone unloading pit hopper 1, vibrating feeder 2, bucket elevator 3, sliding material pipe 5, and limestone storage hopper 6 are connected in sequence. Limestone unloading pit hopper 1 and vibrating feeder 2 are connected by flanges; vibrating feeder 2 and bucket elevator 3 are connected by flanges; bucket elevator 3 and sliding material pipe 5 are connected by welding; sliding material pipe 5 and limestone storage hopper 6 are connected by flanges; limestone sampling device 4 is arranged on the inclined square pipe section of sliding material pipe 5; after the limestone raw material transported by truck is unloaded into limestone unloading pit hopper 1, it passes through vibrating feeder 2, bucket elevator 3, and sliding material pipe 5, and enters limestone storage hopper 6; when the desulfurization system needs to use limestone raw material, the second gate valve 56 of limestone storage hopper 6 is opened, and limestone raw material falls out of limestone storage hopper 6.

[0071] When no sampling is being performed, the first insert valve 38 of the limestone sampling device 4 is closed, the actuator is located outside the connecting pipe 40, and the cover plate 10 and the vertical part of the L-shaped sampling plate 9 are arranged at 0°.

[0072] During limestone sampling, the first slide valve 38 is opened, and the movable rod of the first cylinder 16 extends, pushing the actuator into the connecting pipe 40. When the cover plate 10 touches the rear side of the connecting pipe 40, the movable rod of the second cylinder 15 extends, making the cover plate 10 and the vertical part of the L-shaped sampling plate 9 90° apart. The movable rod of the first cylinder 16 continues to extend until the cover plate 10 is tightly against the rear side of the connecting pipe 40. At this time, the receiving groove 41 is used to accommodate the arc-shaped connecting rod 12. The actuator cuts off the entire flow area of ​​the sliding pipe 5, and the limestone sample slides onto the actuator, thereby collecting the sample.

[0073] After the sampling work is completed, the movable rod of the first cylinder 16 is pulled back, which drives the actuator to move to the outside of the connecting pipe 40. The first insert valve 38 is closed, and the scraper 47 scrapes off the limestone sample on the L-shaped sampling plate 9. After the cover plate 10 touches the scraper 47, the movable rod of the second cylinder 15 is pulled back, so that the cover plate 10 and the vertical part of the L-shaped sampling plate 9 are arranged at 0°. The movable rod of the first cylinder 16 continues to be pulled back, so that the scraper (47) scrapes off all the limestone sample on the L-shaped sampling plate (9). After the limestone sample is scraped off from the L-shaped sampling plate 9, it enters the sample collection pipe 7 through the grid 46 and is finally collected by the sample collection bucket 8.

[0074] The sampling process is repeated every 90 seconds to ensure the uniformity of sampling and the representativeness of the samples.

[0075] After all the samples collected in the sampling bucket 8 are reduced by the quartering method, one part is used for sample testing, one part is used for sample reference, and the remaining limestone raw materials are poured into the limestone unloading pit hopper.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automated limestone sampling device for desulfurization systems in thermal power plants, characterized in that, The system includes a limestone unloading pit hopper, a vibrating feeder, a bucket elevator, a limestone sampling device, a material conveying pipe, a limestone storage hopper, a sampling pipe, and a sampling bucket. The outlet of the limestone unloading pit hopper is connected to the inlet of the vibrating feeder, the outlet of the vibrating feeder is connected to the inlet of the bucket elevator, and the outlet of the bucket elevator is connected to the inlet of the material conveying pipe. The bucket elevator is used to raise the limestone raw material to a height, transferring it from the vibrating feeder to the material conveying pipe. The outlet of the material conveying pipe is connected to the limestone storage hopper. The limestone sampling device is mounted on the material conveying pipe, the sampling bucket is located on the upper surface of the limestone unloading pit hopper, and the sampling pipe is located between the limestone sampling device and the sampling bucket. After the limestone raw material is unloaded into the limestone unloading pit hopper, it is transferred to the limestone storage hopper via the vibrating feeder, the bucket elevator, and the material conveying pipe. During the limestone transfer process, the limestone sampling device performs full-range sampling inside the sliding pipe, and the collected limestone samples are collected by the sampling bucket after passing through the sampling tube. A sampling port is provided on one side of the tube wall of the material sliding tube, and a first slide valve is provided at the sampling port to open and close the sampling port. The limestone sampling device includes an actuator, a fixing mechanism, and a driving mechanism; The fixing mechanism is used to install the actuator and the drive mechanism, and the fixing mechanism is fixedly connected to the sliding tube and is located near the sampling port; The driving mechanism is used to drive the actuator to enter and exit the material tube through the sampling port; The actuator is used to take a sample and transfer the sample to the sample collection tube; The fixing mechanism includes a fixing support plate fixedly connected to the sliding tube, and the fixing support plate is provided with a grid and a scraper. The actuator includes an L-shaped sampling plate, a cover plate, and a flipping mechanism that drives the cover plate to flip. The horizontal portion of the L-shaped sampling plate is located between the grid and the scraper. The end of the vertical portion of the L-shaped sampling plate is hinged to the cover plate via a first hinge axis, and the first hinge axis is perpendicular to the plane where the horizontal portion of the L-shaped sampling plate is located. The flipping mechanism connects the cover plate and the vertical portion of the L-shaped sampling plate and is used to drive the cover plate to flip around the first hinge axis. The driving mechanism includes a first cylinder mounted on a vertical plate, and the output end of the first cylinder is fixedly connected to the vertical part of the L-shaped sampling plate through a fixed bracket.

2. The automated limestone sampling device for desulfurization systems in thermal power plants according to claim 1, characterized in that: The flipping mechanism includes a slide rail and a second cylinder fixed on the vertical part of the L-shaped sampling plate. The output end of the second cylinder is connected to one end of a pull rod located in the slide rail. The other end of the pull rod is hinged to one end of a straight pull rod, and the other end of the straight pull rod is hinged to one end of an arc-shaped connecting rod. The other end of the arc-shaped connecting rod is fixedly connected to the cover plate. The second cylinder drives the pull rod, the straight pull rod, the arc-shaped connecting rod, and the cover plate to move, causing the cover plate to rotate around the first hinge axis within the range of 0~90°.

3. The automated limestone sampling device for desulfurization systems in thermal power plants according to claim 2, characterized in that: The slide has two semi-circular grooves on its two inner walls. The end of the pull rod away from the second cylinder has a ring. The ring is fitted around the middle of the ball bearing connecting rod. The two ends of the ball bearing connecting rod have ball bearings, which are located in the semi-circular grooves. The end of the straight pull rod is rotatably connected to the ball bearing connecting rod.

4. The automated limestone sampling device for desulfurization systems in thermal power plants according to claim 3, characterized in that: The arc-shaped connecting rod includes an arc-shaped segment and a straight segment. One end of the straight segment is fixedly connected to the cover plate, and the other end of the straight segment is fixedly connected to one end of the arc-shaped segment. The other end of the arc-shaped segment is hinged to the end of the straight pull rod.

5. The automated limestone sampling device for desulfurization systems in thermal power plants according to claim 4, characterized in that: The top of the limestone storage hopper has an atmospheric communication pipe, and the bottom of the limestone storage hopper has a second gate valve.

6. The automated limestone sampling device for desulfurization systems in thermal power plants according to claim 5, characterized in that: The upper surface of the limestone unloading pit hopper is equipped with a filter grate, and the bottom of the limestone unloading pit hopper is equipped with a third baffle valve. The sample collection bucket is placed on the filter grate.

7. The automated limestone sampling device for desulfurization systems in thermal power plants according to claim 6, characterized in that: The material conveying pipe is inclined, and the outlet of the bucket elevator is higher than the top of the limestone storage hopper.

8. The method of using the automated limestone sampling device for desulfurization systems in thermal power plants according to claim 7, characterized in that, include: After the limestone raw material is unloaded into the limestone unloading pit hopper, it is transferred to the limestone storage hopper via the vibrating feeder, the bucket elevator, and the sliding pipe. When no sampling is being performed, the first gate valve closes the sampling port, the actuator is located outside the slide tube, and the plane of the cover plate coincides with the plane of the vertical part of the L-shaped sampling plate; During sampling, the first gate valve opens the sampling port, the first cylinder drives the actuator to enter the sliding tube; and the second cylinder drives the plane of the cover plate to be perpendicular to the plane of the vertical part of the L-shaped sampling plate. After sampling, the first cylinder drives the actuator back to the outside of the material tube, the first slide valve closes the sampling port, the scraper scrapes the sample off the L-shaped sampling plate, and collects it in the sample collection bucket through the grid and the sample collection tube. After the cover plate touches the scraper, the second cylinder drives the plane of the cover plate to coincide with the plane of the vertical part of the L-shaped sampling plate, completing one sampling cycle. The sampling action is repeated once every set time interval.

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