Dry denitrification equipment feed assembly

Abstract

This invention discloses a feeding assembly for a dry denitrification device, belonging to the field of boiler flue gas treatment. It includes a silo, a feeding device, and a discharge device. The silo is inclined with its rear end facing downwards and its front end facing upwards, so that its central axis is inclined relative to the horizontal direction. The silo is connected to a drive device that drives it to rotate around its central axis. A feeding window and a discharge hole are respectively opened on the front and rear ends of the silo. The feeding device is located on the outer surface of the rear end of the silo, and the discharge device is located diagonally below and behind the feeding device. This invention, by tilting the silo to its side and continuously rotating it, solves the problem of denitrification agent clumping in the silo during continuous feeding. It also prevents the denitrification agent from sticking to the silo without the need for a vibrating motor, avoiding the problems of denitrification agent compaction and clumping caused by the vibrating motor and the operational jamming of the denitrification equipment. This reduces equipment costs and ensures the stability, continuity, and smoothness of the feeding process.

Description

Technical Field

[0001] This invention relates to the field of boiler flue gas treatment, and in particular to a feed assembly for a dry denitrification equipment. Background Technology

[0002] To prevent nitrogen oxide pollution from coal combustion in boilers, denitrification treatment of boiler flue gas is necessary. With increasingly stringent environmental protection requirements, the removal of nitrogen oxides from flue gas is becoming more demanding, demanding not only ultra-low emission standards but also extremely strict time control. Traditional non-zero nitrogen oxide refrigerant (SNCR) methods, which involve injecting ammonia or urea solution into the furnace, are wet denitrification processes that cannot consistently achieve ultra-low emission standards and suffer from a series of problems, including corrosion, tube rupture, energy waste, and inconvenience in storage and transportation.

[0003] Dry denitrification is a relatively economical method for denitrifying boiler flue gas. It involves spraying powdered or granular denitrifying agents into the boiler, where they react with nitrogen oxides in the flue gas to achieve denitrification. Dry denitrification places higher demands on the operational stability, continuity, and smooth flow of the denitrification equipment. Conventional dry denitrification equipment includes a vertically fixed silo where the denitrifying agent is stored. A stirring motor drives stirring blades on the silo to agitate the agent, preventing uneven or stopped feeding. A vibrating motor is also installed to prevent the denitrifying agent from sticking to the silo.

[0004] A star-shaped discharge valve or similar feeder is installed at the bottom of the silo. The denitrification agent falls through the feeder into a Venturi tube below the silo for temporary storage. The Venturi tube is connected to a conveying pipeline. Pressurized air supplied by a blower blows the denitrification agent temporarily stored in the Venturi tube into the boiler along the conveying pipeline. Inside the boiler, the denitrification material undergoes a reduction reaction with nitrogen oxides, thus achieving denitrification.

[0005] Neither agitator motor nor vibratory motor can fully guarantee that the denitrification agent will not clump. While agitator motors can provide some agitation, the compression of the denitrification agent by the agitator blades during agitation can easily cause clumping within the silo. Vibratory motors, although able to remove denitrification agent adhering to the silo, tend to compact and clump at the bottom of the silo due to vibration. Clumping of the denitrification agent affects the stability, continuity, and smoothness of the discharge. Furthermore, the vibration of the vibratory motor can cause operational interruptions in the denitrification equipment, also hindering the discharge of the denitrification agent. In addition, equipping the silo with multiple motors (at least one agitator motor and at least one vibratory motor) increases equipment costs. Summary of the Invention

[0006] To address the problems of existing technologies, this invention provides a feeding assembly for a dry denitrification equipment, which solves the problems of denitrification agent clumping in the silo and sticking to the silo, ensuring the stability, continuity and smoothness of the feeding process, and reducing the cost of the equipment.

[0007] The technical solution provided by this invention is as follows:

[0008] A dry denitrification equipment feeding assembly includes a hopper, a feeding device and a feed dropper. The hopper is inclined with its rear end facing down and its front end facing up, so that the central axis of the hopper is inclined relative to the horizontal direction. The hopper is connected to a drive device that drives the hopper to rotate around its own central axis.

[0009] The hopper has a feeding window at its front end and a set of hopper discharge holes at its rear end. The discharge device is inclinedly disposed on the outer surface of the rear end of the hopper, and the dropper is inclinedly disposed below and behind the discharge device.

[0010] Furthermore, a set of guide plates is fixedly installed on the inner surface of the rear end of the hopper, which are matched one by one with a set of hopper discharge holes. The guide plates are arranged perpendicularly or inclined to the inner surface of the rear end of the hopper.

[0011] The inner end of each guide plate extends to the discharge port of the hopper that it matches, and the outer end extends outward at the rear end of the hopper. Each guide plate is located behind the discharge port of the hopper that it matches in the rotation direction of the hopper. The guide plate guides the denitrification agent inward to the discharge port of the hopper.

[0012] Furthermore, a baffle plate is connected near the inner end of the guide plate. The baffle plate is located inside the discharge hole of the hopper. The baffle plate and the guide plate form an outward-facing V-shaped baffle structure at the connection point. The discharge hole of the hopper is located outside the V-shaped baffle structure. The V-shaped baffle structure blocks the denitrification agent that is guided from the guide plate to the inside at the discharge hole of the hopper outside the V-shaped baffle structure.

[0013] Furthermore, there are multiple material discharge holes and guide plates in the hopper, and the baffle plate corresponding to each guide plate is a part of the inner side of other guide plates.

[0014] Furthermore, a material-pushing plate is fixedly installed on the inner surface of the side wall of the hopper. The front end and rear end of the material-pushing plate extend toward the front end and rear end of the hopper, respectively. The cross-section at the connection between the material-pushing plate and the inner surface of the side wall of the hopper is perpendicular or inclined to the material-pushing plate.

[0015] Furthermore, the rear end of the feeding plate is connected to the outer end of the guide plate, and the denitrification agent sliding towards its rear end on the feeding plate enters the guide plate from the connection point.

[0016] Furthermore, the feeding device includes a first-stage feeding plate, a second-stage feeding plate, and a third-stage feeding plate arranged in a series of inclined sections from the upper front to the lower rear, with the surfaces of the first-stage feeding plate, the second-stage feeding plate, and the third-stage feeding plate in contact with each other being in close contact.

[0017] The first-stage feeding tray, the second-stage feeding tray, and the third-stage feeding tray are respectively provided with a first set of feeding holes, a second set of feeding holes, and a third set of feeding holes, which respectively penetrate through the thickness direction of the first-stage feeding tray, the second-stage feeding tray, and the third-stage feeding tray;

[0018] The first-stage feeding disc, the second-stage feeding disc, and the third-stage feeding disc rotate relative to each other. When they rotate relative to each other until the first set of feeding holes and the second set of feeding holes are connected, the second set of feeding holes and the third set of feeding holes are not connected. When they rotate relative to each other until the second set of feeding holes and the third set of feeding holes are connected, the first set of feeding holes and the second set of feeding holes are not connected.

[0019] Furthermore, the discharge holes of the hopper, the first set of discharge holes, the second set of discharge holes, and the third set of discharge holes are evenly distributed on a circle with a radius of R, centered on the rear end of the hopper, the first-stage discharge plate, the second-stage discharge plate, and the third-stage discharge plate. The centers of the rear end of the hopper, the first-stage discharge plate, the second-stage discharge plate, and the third-stage discharge plate are all located on the central axis of the hopper.

[0020] Furthermore, the first-stage and third-stage feeding trays are fixed in place, while the second-stage feeding tray rotates around the central axis of the hopper, and the first and third sets of feeding holes are staggered.

[0021] Furthermore, a hopper follow-up hopper is provided between the first-stage hopper and the rear end of the hopper. The hopper follow-up hopper is fixed to the outer surface of the rear end of the hopper, and the surfaces of the hopper follow-up hopper and the first-stage hopper that are in contact with each other are tightly attached together.

[0022] The hopper has a set of follow-up feeding holes on its follow-up feeding plate. The hopper feeding holes, the follow-up feeding holes and the second set of feeding holes are aligned. The hopper, the hopper follow-up feeding plate and the second feeding plate all rotate synchronously around the central axis of the hopper.

[0023] Furthermore, the surfaces of the feed tray, the first-stage feed tray, the second-stage feed tray, and the third-stage feed tray that come into contact with each other are made of polytetrafluoroethylene (PTFE).

[0024] Furthermore, a set of limiting plates is provided on the outer surface of the rear end of the hopper, the set of limiting plates forming a limiting groove, the edge of the limiting groove having a first set of limiting planes, and the outer periphery of the hopper follow-up feeding tray having a second set of limiting planes, the hopper follow-up feeding tray being located in the limiting groove, so that the front surface of the hopper follow-up feeding tray is attached to the outer surface of the rear end of the hopper, and the second set of limiting planes cooperates with the first set of limiting planes to limit movement.

[0025] Furthermore, a hopper bushing extending obliquely downward is fixedly provided on the center of the outer surface of the rear end of the hopper. The central axis of the hopper bushing coincides with the central axis of the hopper. The hopper follow-up feeding plate, the first-stage feeding plate and the second-stage feeding plate pass through the hopper bushing through through holes opened in their respective centers.

[0026] The first-stage feeding disc is not connected to the hopper bushing, and the second-stage feeding disc is connected to the hopper bushing through a follower structure, so that the second-stage feeding disc rotates synchronously with the hopper bushing.

[0027] Furthermore, a pressure plate is provided on the lower rear side of the second-stage feeding disc, and the pressure plate is sleeved on the hopper bushing. An external thread is provided on one side of the rear end of the hopper bushing, and a nut with a washer is screwed onto the external thread. A feeding disc clamping spring is sleeved on the hopper bushing between the pressure plate and the washer. The feeding disc clamping spring presses the second-stage feeding disc, the first-stage feeding disc, and the hopper follow-up feeding disc against the outer surface of the rear end of the hopper through the pressure plate. The nut adjusts the clamping force of the feeding disc clamping spring.

[0028] Furthermore, the follower structure includes a keyway and a key, the keyway being formed on the hopper bushing, and the key being disposed in the through hole at the center of the second-stage feed tray;

[0029] Alternatively, the follower structure includes a keyway and a key. The keyway is formed on the hopper bushing, and the key is disposed in a through hole in the center of the pressure plate. The pressure plate is fixedly connected to the second-stage feed plate by a pin.

[0030] Furthermore, the second-stage feeding disc has a circular boss that protrudes obliquely downward on the center portion of the rear end surface. The pressure plate presses on the circular boss, and the third-stage feeding disc is fitted onto the outer periphery of the circular boss through a through hole in its center.

[0031] Alternatively, the pressure plate presses against the surface of the rear end of the second-stage feed plate, and the third-stage feed plate is fitted onto the outer periphery of the pressure plate through a through hole in its center.

[0032] Furthermore, the feeder is located on the lower rear side of the third-stage feed plate. The feeder is inclined and has an inclined feeding channel inside. The third-stage feed plate is fixed on the outer surface of the front end of the feeder. A feeder feeding hole is opened on the front end of the feeder, and the feeder feeding hole is aligned with the third set of feeding holes.

[0033] Furthermore, a through hole is provided in the middle of the front end of the feeder, the surface of the rear end of the third-stage feed tray is attached to the outer surface of the front end of the feeder, and a structure on the obliquely rear-lower surface of the rear end of the third-stage feed tray extends into the feeder through the through hole.

[0034] Furthermore, a hopper support is provided below the hopper, and the hopper is inclined on the hopper support; a feeder fixing seat is provided on the lower rear side of the feeder, and the feeder fixing seat has a square cavity with an open front end. The bottom end of the feeder fixing seat is inclined and fixed on the hopper support. The feeding device and the feeder extend into the square cavity from the open front end of the square cavity, and the feeder is fixed on the feeder fixing seat.

[0035] Furthermore, a third set of limiting planes is provided on the outer periphery of the left and / or right sides of the first-stage feeding tray, and a fourth set of limiting planes is provided on the outer periphery of the left and / or right sides of the third-stage feeding tray. The third and fourth sets of limiting planes cooperate with the left and / or right walls of the feeding device fixing seat for limiting.

[0036] Furthermore, the hopper has a cylindrical structure, and the driving device includes a motor and multiple support wheels mounted on the hopper support. The hopper is inclinedly mounted on the multiple support wheels, and the lower part of the side wall of the hopper contacts the outer peripheral surface of the support wheels. The motor is connected to some or all of the multiple support wheels, and the support wheels connected to the motor drive the hopper to rotate around its own central axis by friction under the drive of the motor.

[0037] Furthermore, multiple support wheels are distributed on the lower left and right sides of the side wall of the hopper, and the rotation axes of the multiple support wheels are inclined and parallel to the central axis of the hopper. The motor is connected to the support wheel on the lower left or right side of the side wall of the hopper.

[0038] Furthermore, a pressure roller is provided above the side wall of the silo. The pressure roller is mounted on a pressure roller bracket, which is fixed to the silo bracket. The rotation axis of the pressure roller is inclined and parallel to the central axis of the silo. The bottom of the outer circumferential surface of the pressure roller is pressed against the top of the side wall of the silo.

[0039] Furthermore, the pressure roller support includes two columns and a crossbeam. The two columns are located on the left and right sides of the hopper, and the crossbeam is located above the side wall of the hopper and connected to the two columns.

[0040] A pressure roller mounting rod is provided above the side wall of the silo. The pressure roller is mounted on the pressure roller mounting rod. The pressure roller mounting rod is located below the crossbeam and is movably mounted on the column. A clamping mechanism is provided between the pressure roller mounting rod and the crossbeam to press the pressure roller mounting rod down so that the bottom of the outer circumference of the pressure roller is pressed against the top of the side wall of the silo.

[0041] Furthermore, the first end of the pressure roller mounting rod is rotatably connected to a column, and the second end of the pressure roller mounting rod is slidably connected to another column. The clamping mechanism is a clamping spring, which is located at the second end of the pressure roller mounting rod. The lower and upper ends of the clamping spring are respectively connected to the pressure roller mounting rod and the crossbeam. Under the elastic force of the clamping spring, the second end of the pressure roller mounting rod presses the bottom of the outer circumference of the pressure roller against the top of the side wall of the hopper.

[0042] Furthermore, a weighing device is provided below the hopper support, the weighing device is mounted on the base, the hopper support is located on the weighing device, and the weighing device is used to connect to external feeding equipment via an electrical signal.

[0043] Furthermore, a balance shaft is provided below the hopper support. The balance shaft is horizontally positioned and perpendicular to the central axis of the hopper. The hopper support is mounted on the balance shaft and can swing back and forth along the balance shaft as the axis.

[0044] The position of the balance shaft is set such that when the weight of the denitrifying agent in the silo exceeds a first set value, the silo support swings downward toward the rear end of the silo; and when the weight of the denitrifying agent in the silo is less than a second set value, the silo support swings downward toward the front end of the silo; the second set value is less than the first set value.

[0045] A first limit switch is provided on one of the front and rear sides of the balance shaft. The first limit switch is located below the hopper support and is used to connect to an external feeding device via an electrical signal.

[0046] Furthermore, a second limit switch or support block is provided on the other side of the front and rear sides of the balance shaft. The second limit switch or support block is located below the hopper support. The second limit switch is used to connect to an external feeding device via an electrical signal.

[0047] Furthermore, a counterweight block located outside the hopper is connected to the rear end of the hopper.

[0048] Furthermore, a material feeder mounting shaft extending obliquely downwards is provided on the rear end of the material feeder. The material feeder mounting shaft extends obliquely downwards from a through hole opened on the rear end of the material feeder fixing seat. A spherical washer is provided on the material feeder mounting shaft between the material feeder and the material feeder fixing seat.

[0049] Furthermore, a support baffle is fixedly provided on the outer surface of the rear end of the feeder fixing seat. The support baffle is located below the feeder mounting shaft. The fixed position of the support baffle is adjustable up and down. The support baffle locks the feeder mounting shaft in the up and down direction.

[0050] And / or, a material feeder fixing nut is fitted onto the portion of the material feeder mounting shaft that extends out of the material feeder fixing seat, and the material feeder fixing nut tightens the material feeder to the material feeder fixing seat.

[0051] Furthermore, the counterweight is disposed on the portion of the feeder mounting shaft that extends out of the feeder fixing seat.

[0052] Furthermore, the feed window is circular in shape, and a screen is provided on the feed window. The screen is a cylindrical structure with an open front end. Screen holes are provided on the rear end and sides of the screen. The front end of the screen is connected to the feed window, and the rear end and sides of the screen extend into the hopper.

[0053] Furthermore, the silo wall is provided with an insulation layer, and an electric heating element is installed inside the insulation layer.

[0054] The present invention has the following beneficial effects:

[0055] This invention features a side-lying, tilted hopper that rotates continuously. This not only ensures continuous material feeding but also solves the problem of denitrification agent clumping within the hopper. By eliminating the need for a vibrating motor, it also prevents the denitrification agent from sticking to the hopper, avoiding the compaction and clumping issues caused by the vibrating motor and the resulting operational disruptions in the denitrification equipment. This guarantees the stability, continuity, and smoothness of the feeding process. Eliminating the vibrating motor requires only one motor to drive the hopper's rotation, reducing equipment costs. Attached Figure Description

[0056] Figure 1 This is a perspective view of the feeding assembly of the dry denitrification equipment of the present invention;

[0057] Figure 2 for Figure 1 A schematic diagram after removing the feeder and feeder mounting base;

[0058] Figure 3 This is a perspective view of the feeding assembly of the dry denitrification equipment of the present invention.

[0059] Figure 4 This is an assembly diagram of the silo, silo support, and drive unit.

[0060] Figure 5 This is a schematic diagram of the silo;

[0061] Figure 6 This is a schematic diagram of the feeding device;

[0062] Figure 7 This is a schematic diagram showing the arrangement of the guide plate;

[0063] Figure 8 This is a partial sectional view of the feeding assembly of a dry denitrification equipment using a weighing device;

[0064] Figure 9 for Figure 8 Enlarged view of region A (when the first set of feed holes and the second set of feed holes are connected);

[0065] Figure 10 for Figure 8 Enlarged view of region A (when the second set of feed holes and the third set of feed holes are connected);

[0066] Figure 11 This is a partial sectional view of the feeding assembly of a dry denitrification equipment that uses a limit switch;

[0067] Figure 12 for Figure 11 Enlarged view of region B (when the first set of feed holes and the second set of feed holes are connected);

[0068] Figure 13 This is a partial cross-sectional view of the feeding assembly of a dry denitrification equipment that uses two limit switches;

[0069] Figure 14 This is a schematic diagram of a screening device;

[0070] Figure 15 This is a schematic diagram of the feeder;

[0071] Figure 16 A schematic diagram of the feeder mounting base;

[0072] Figure 17 This is a usage example diagram of the feed assembly of the dry denitrification equipment of the present invention. Detailed Implementation

[0073] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0074] This invention provides a feeding assembly for a dry denitrification device, such as... Figure 1-17 As shown, it includes a hopper 7, a feeding device 100 and a dropper 11. The hopper 7 is inclined with its rear end facing down and its front end facing up, so that the central axis of the hopper 7 is inclined relative to the horizontal direction. The hopper 7 is connected to a drive device that drives the hopper 7 to rotate with its own central axis as the pivot.

[0075] A feeding window 15 is provided at the front end of the hopper 7, and a set of hopper discharge holes 8 is provided at the rear end of the hopper 7. The discharge device 100 is inclinedly arranged on the outer surface of the rear end of the hopper 7, and the dropper 11 is inclinedly arranged below and behind the discharge device 100.

[0076] The present invention defines the directions as follows: the front-to-back direction is defined according to the direction of the denitrification agent discharge, with the position the denitrification agent passes through first being the front and the position it passes through last being the rear. The denitrification agent first enters the hopper through the feed window 15 and then discharges through the discharge hole 8. Therefore, the end of the hopper 7 with the feed window 15 is defined as the front end, and the end with the discharge hole 8 is defined as the rear end. The front and rear definitions of other components are based on the front-to-back definition of the hopper 7. The upper and lower directions in the vertical direction are defined as the upper and lower directions of the present invention, and the directions perpendicular to the vertical and front-to-back directions are defined as the left and right directions of the present invention. All directions described below are based on these definitions.

[0077] This invention changes the traditional vertical arrangement of the silo in dry denitrification equipment. Instead, the silo 7 is arranged in a side-lying, inclined configuration, with a lower rear end and a higher front end. This creates a tilt angle between the central axis of the silo 7 and the horizontal direction. A drive device continuously rotates the silo 7 along this inclined central axis. During operation, the denitrifying agent is added to the silo 7 through the feed window 15. As the silo 7 rotates, the denitrifying agent continuously enters the feeding device 100 from the discharge port 8 at the rear end of the silo 7. The denitrifying agent is then conveyed through the feeding device 100 to the feeder 11. Pressurized air supplied by a blower propels the denitrifying agent along the conveying pipe into the boiler. Inside the boiler, the denitrifying agent undergoes a reduction reaction with nitrogen oxides, resulting in denitrification.

[0078] This invention changes the existing method of agitating the denitrification agent by using a stirring motor to drive stirring blades. Instead, it uses a tilted and rotating hopper 7 to agitate the denitrification agent. During the tilting and rotating process, the denitrification agent rises to a certain height under the influence of the inner wall of the hopper 7, and then falls under gravity, thus continuously tumbling and agitating the denitrification agent. This continuous rising and falling tumbling and agitation process prevents the denitrification agent from clumping. Even if there are already clumps, the continuous rising and falling tumbling and agitation process can break them up, preventing uneven feeding or cessation of feeding. Compared with the existing agitation method using stirring blades, this tumbling and agitation method avoids clumping caused by the compression of the denitrification agent by the stirring blades.

[0079] During the rotation of silo 7, the inner wall of silo 7 repeatedly rises and falls, causing the denitrification agent to continuously rise and fall, tumbling and agitating within silo 7. Therefore, the denitrification agent is unlikely to stick to the inner wall of silo 7. Even if some denitrification agent does stick to the inner wall of silo 7, it will fall off under gravity when that part rotates to the top. Furthermore, the continuous rising and falling tumbling and agitation of the denitrification agent creates friction with the inner wall of silo 7, which also causes any stuck denitrification agent to fall off. Therefore, this invention not only prevents the denitrification agent from sticking to silo 7, but also eliminates the need for a vibrating motor, preventing the denitrification agent from compacting and clumping due to the vibrating motor, and avoids any jamming during the operation of the denitrification equipment.

[0080] During the rotation of the hopper 7, the denitrifying agent continuously rises and falls and tumbles and stirs inside the hopper 7. Since the hopper 7 is tilted with the rear end facing downwards and has a hopper discharge hole 8 at the rear end, the denitrifying agent will be discharged outwards from the hopper discharge hole 8 at the rear end while it is tumbling and stirring during the rotation.

[0081] As described above, this invention, by tilting the silo to its side and continuously rotating it, achieves continuous material feeding while resolving the issue of denitrification agent clumping within the silo. It also prevents the denitrification agent from sticking to the silo by eliminating the need for a vibrating motor, thus avoiding the problems of denitrification agent compaction and clumping caused by the vibrating motor, and ensuring the stability, continuity, and smoothness of the feeding process. Eliminating the vibrating motor requires only one motor to drive the silo's rotation, reducing equipment costs.

[0082] The tilt angle of silo 7 relative to the horizontal direction is greater than 0° and less than 90°. The smaller the tilt angle of silo 7, the greater the tumbling and stirring function, and the more difficult it is for the denitrifying agent to enter the silo discharge port 8. When silo 7 is horizontal, the denitrifying agent cannot enter the silo discharge port 8. The larger the tilt angle of silo 7, the smaller the tumbling and stirring function, and the easier it is for the denitrifying agent to enter the silo discharge port 8. When it is vertical, the denitrifying agent cannot be tumbled and stirred as silo 7 rotates.

[0083] To balance the strength of the tumbling and stirring function with the ease with which the denitrifying agent enters the feed hole 8 of the silo, an appropriate tilt angle can be selected as needed. For example, the tilt angle can be selected within the range of 10° to 40°.

[0084] The feeding speed of the denitrification agent in silo 7 into the silo discharge port 8 is adjusted by the rotation speed of silo 7. One rotation of silo 7 completes one discharge process for one set of silo discharge ports 8. The higher the rotation speed of silo 7, the faster the discharge from silo discharge ports 8, and vice versa. The rotation speed of silo 7 is adjusted by a drive device.

[0085] As an improvement to an embodiment of the present invention, such as Figure 5 , 7 As shown, a set of guide plates 16 are fixedly installed on the inner rear surface of the hopper 7, which are matched one by one with a set of hopper discharge holes 8. The guide plates 16 are long strip-shaped plate structures. The guide plates 16 are perpendicular to the inner rear surface of the hopper body 7, or they can be inclined at a certain angle.

[0086] The inner end of each guide plate 16 extends to the corresponding discharge hole 8 of the hopper, and the outer end extends outward at the rear end of the hopper 7, that is, the guide plate 16 is arranged radially along the rear end of the hopper 7. Each guide plate 16 is located behind the corresponding discharge hole 8 in the direction of rotation of the hopper 7. The denitrification agent is located in the structure formed between the guide plate 16 and the rear end of the hopper 7. During the rotation of the hopper 7, the guide plate 16 guides the denitrification agent inward to the discharge hole 8 of the hopper, thereby discharging it outward from the discharge hole 8.

[0087] This invention facilitates the discharge of materials from the hopper discharge hole 8 by setting the guide plate 16 as the guide plate 16. Even if there is only a small amount of denitrifying agent in the hopper 7, it can still enter the hopper discharge hole 8 under the guidance of the guide plate 16, thus achieving complete discharge of all denitrifying agent in the hopper 7 without any denitrifying agent residue.

[0088] To further facilitate the discharge of the denitrifying agent into the hopper discharge port 8, a baffle plate 17 is connected to the inner end of the guide plate 16. The baffle plate 17 is located inside the hopper discharge port 8, that is, closer to the center of the rear end of the hopper 7. The baffle plate 17 and the guide plate 16 form an outward-facing V-shaped baffle structure 18 at the connection point. The hopper discharge port 8 is located outside the V-shaped baffle structure 18. The V-shaped baffle structure 18 blocks the denitrifying agent guided inward from the guide plate 16 at the hopper discharge port 8 outside the V-shaped baffle structure 18. After the denitrifying agent is guided to the V-shaped baffle structure 18, it cannot continue to be guided forward due to the obstruction of the baffle plate 17 and remains in the V-shaped baffle structure 18, and then is completely discharged from the hopper discharge port 8 located at the V-shaped baffle structure 18.

[0089] The aforementioned material hopper discharge hole 8 and guide plate 16 are multiple. At this time, a part of one guide plate can serve as a baffle for another guide plate. For example, the baffle 17 corresponding to each guide plate 16 is a part of the other guide plate near the inside.

[0090] Taking three guide plates 16 as an example, each guide plate 16 is slightly deviated from the radial direction of the rear end of the hopper 7 at a certain angle. The three guide plates 16 are connected to each other in the middle part, forming a closed triangular structure 19 around the center of the rear end of the hopper 7. The outside of each vertex of the closed triangular structure 19 is formed by two guide plates 16 to form a V-shaped baffle structure 18.

[0091] As another improvement to this embodiment of the invention, the hopper 7 has a cylindrical structure. The two end faces of the cylindrical structure serve as the front and rear ends of the hopper 7, respectively, and the side of the cylindrical structure serves as the sidewall of the hopper 7. A material-pushing plate 20 is fixedly installed on the inner surface of the sidewall of the hopper 7. The material-pushing plate 20 has a long, strip-shaped structure, and its front and rear ends extend towards the front and rear ends of the hopper 7, respectively. That is, the material-pushing plate 20 is arranged approximately along the height direction of the cylindrical structure. Figure 9 , 11 As shown in Figure 13, the cross-section at the connection between the material feeding plate 20 and the inner surface of the side wall of the hopper 1 can be perpendicular to or inclined to the material feeding plate 20.

[0092] The material-pushing plate 20 can lift the denitrification agent during the rotation of the hopper 7, improving the tumbling and mixing effect. In addition, the rear end of the material-pushing plate 20 extends towards the rear end of the hopper 7, which can guide the denitrification agent on the material-pushing plate 20 to the rear end of the hopper 7, facilitating the discharge of the hopper discharge hole 8.

[0093] The length of the feeding plate 20 can be straight. In this case, the length of the feeding plate 20 can be parallel to the central axis of the hopper 7, that is, parallel to the height direction of the cylindrical structure, or it can form a set angle with it. The angle is small, and the feeding plate 20 cannot be perpendicular to the height direction of the cylindrical structure (that is, parallel to the front or rear face of the hopper 7), because this would not achieve the function of the feeding plate 20.

[0094] Alternatively, the feeding plate 20 may have a set arc-shaped structure along its length. During the rotation of the hopper 7, this arc-shaped structure makes it easier for the denitrifying agent on the feeding plate 20 to be guided to the rear end of the hopper 7.

[0095] Furthermore, the rear end of the material feeding plate 20 can be connected to the outer end of the guide plate 16. The denitrification agent sliding from the rear end of the material feeding plate 20 enters the guide plate 16 from the connection point and is then guided by the guide plate 16 to the material discharge hole 8 of the hopper, which makes it easier to discharge the material from the material discharge hole 8 of the hopper.

[0096] Conventional dry denitrification equipment in the present technology includes a vertically fixed silo where the denitrifying agent is stored. A star-shaped discharge valve or similar feeder is installed at the bottom of the silo, through which the denitrifying agent falls into a Venturi tube below the silo for temporary storage. The Venturi tube is connected to a conveying pipeline, and pressurized air supplied by a blower blows the temporarily stored denitrifying agent in the Venturi tube into the boiler along the conveying pipeline. Inside the boiler, the denitrifying material undergoes a reduction reaction with nitrogen oxides, thus achieving denitrification.

[0097] Because the venturi tube and hopper of conventional dry denitrification equipment are connected, a backflow problem exists. During operation, pressurized air from the venturi tube flows back into the hopper, pushing the denitrification agent upwards, causing intermittent feeding, affecting the denitrification effect, and resulting in excessive nitrogen oxide emissions. When the equipment is shut down, especially in summer when humidity is high, the humid backflow causes the material to absorb water and clump together, preventing feeding. The feeder must be disassembled and the hardened material manually broken up to allow it to drain, which is time-consuming, labor-intensive, and disrupts production.

[0098] To address the backflow problem in existing dry denitrification equipment, the feeding device 100 provided by this invention includes a first-stage feeding disc 1, a second-stage feeding disc 2, and a third-stage feeding disc 3, which are arranged obliquely and parallel to each other from the front top to the rear bottom. The surfaces of the first-stage feeding disc 1, the second-stage feeding disc 2, and the third-stage feeding disc 3 that come into contact with each other are in close contact. Figure 6 , 9 As shown in Figures 10 and 12.

[0099] The first-stage feeding tray 1, the second-stage feeding tray 2, and the third-stage feeding tray 3 are respectively provided with a first set of feeding holes 4, a second set of feeding holes 5, and a third set of feeding holes 6, which respectively penetrate through the thickness direction of the first-stage feeding tray 1, the second-stage feeding tray 2, and the third-stage feeding tray 3.

[0100] The first-stage feeding disc 1, the second-stage feeding disc 2, and the third-stage feeding disc 3 rotate relative to each other. When they rotate relative to each other until the first set of feeding holes 4 and the second set of feeding holes 5 are connected, the second set of feeding holes 5 and the third set of feeding holes 6 are not connected. When they rotate relative to each other until the second set of feeding holes 5 and the third set of feeding holes 6 are connected, the first set of feeding holes 4 and the second set of feeding holes 5 are not connected.

[0101] During use, the denitrifying agent enters the first set of discharge holes 4 from the discharge hole 8 of the silo 7. When the silo rotates relative to each other until the first set of discharge holes 4 and the second set of discharge holes 5 are connected, the denitrifying agent enters the second set of discharge holes 5 from the first set of discharge holes 4. At this time, the second set of discharge holes 5 is not connected to the third set of discharge holes 6, and the airflow of the denitrifying agent after being blown out from behind the third-stage discharge plate 3 is blocked by the third-stage discharge plate 3, preventing the airflow from entering the silo 7.

[0102] When the relative rotation reaches the point where the second set of discharge holes 5 and the third set of discharge holes 6 are connected, the denitrifying agent enters the third set of discharge holes 6 from the second set of discharge holes 5, and then enters the subsequent feeder, conveying pipeline, etc., through the third set of discharge holes 6. It is then blown into the boiler by air force to undergo a denitrification reaction and remove nitrogen oxides. At this time, the first set of discharge holes 4 and the second set of discharge holes 5 are not connected, and the first-stage discharge plate 1 blocks the air force outside the hopper 7, preventing the air force from entering the hopper.

[0103] In this invention, during the rotation of the three feeding discs, the denitrification agent is delivered step-by-step through the three sets of feeding holes on the discs, ensuring smooth material feeding. Since the first set of feeding holes 4, the second set of feeding holes 5, and the third set of feeding holes 6 are never fully connected, airflow will not return to the hopper 7 through these three sets of feeding holes, completely solving the problem of backflow during feeding in dry denitrification equipment. This further resolves the issues of intermittent and jammed feeding caused by backflow, ensuring smooth feeding, thus guaranteeing that nitrogen oxide emissions meet standards, and also solving the problem of humid air from backflow causing the denitrification material to absorb water and clump together, preventing feeding.

[0104] The surfaces of the three feeding discs are in close contact with each other, which does not affect the rotation of the feeding discs, and ensures a tight contact and no leakage. This prevents wind from flowing back through the gaps between the three feeding discs and also prevents the denitrification material in the three sets of feeding holes from entering between the two feeding discs. This avoids wear on the feeding discs and makes them easy to clean.

[0105] This invention does not limit the specific arrangement of each group of discharge holes. In one example, the discharge holes 8, the first group of discharge holes 4, the second group of discharge holes 5, and the third group of discharge holes 6 are evenly distributed on a circle with a radius of R centered on the rear end of the hopper 7, the center of the first-stage discharge plate 1, the second-stage discharge plate 2, and the third-stage discharge plate 3. The centers of the rear end of the hopper 7, the first-stage discharge plate 1, the second-stage discharge plate 2, and the third-stage discharge plate 3 are all located on the central axis of the hopper 1.

[0106] For example, there are three discharge holes in each group: 8 (hopper discharge hole), 4 (first group discharge hole), 5 (second group discharge hole), and 6 (third group discharge hole). The diameter of each discharge hole is 20–50 mm, preferably 40 mm. The radius R of the circumference of each group of discharge holes is 60–80 mm, preferably 70 mm.

[0107] The specific method by which the three sets of feeding holes are not all connected in this invention includes: the first-stage feeding plate 1 and the third-stage feeding plate 3 are fixed, the second-stage feeding plate 2 rotates around the central axis of the hopper 7, and the first set of feeding holes 4 and the third set of feeding holes 6 are staggered.

[0108] Since the first-stage feeding disc 1 and the third-stage feeding disc 3 are fixed, the relative positions of the first set of feeding holes 4 and the third set of feeding holes 6 will not change. However, the first set of feeding holes 4 and the third set of feeding holes 6 are staggered, not directly connected, for example, staggered by 60°. Therefore, when the second-stage feeding disc 2 rotates, if it rotates to the point where the first set of feeding holes 4 and the second set of feeding holes 5 are connected, the second set of feeding holes 5 and the third set of feeding holes 6 will definitely not be connected. Similarly, when it rotates to the point where the second set of feeding holes 5 and the third set of feeding holes 6 are connected, the second set of feeding holes 5 and the first set of feeding holes 4 will definitely not be connected. This achieves the goal that the three sets of feeding holes are never fully connected.

[0109] A follow-up feeder 9 can also be installed between the first-stage feeder 1 and the rear end of the hopper 7. The follow-up feeder 9 is fixed to the outer surface of the rear end of the hopper 7, and the surfaces of the follow-up feeder 9 and the first-stage feeder 1 are in close contact. Figure 9 , 10 As shown in Figures 1 and 12.

[0110] The hopper follow-up feeding plate 9 is provided with a set of follow-up feeding holes 10. The hopper feeding holes 8, the follow-up feeding holes 10 and the second set of feeding holes 5 are aligned. The hopper 7, the hopper follow-up feeding plate 9 and the second feeding plate 2 all rotate synchronously around the central axis of the hopper 7.

[0111] During the rotation of the hopper 7, the hopper follower discharge plate 9, and the second-stage discharge plate 2, when the hopper discharge hole 8, the follower discharge hole 10, and the second set of discharge holes 5 are connected to the stationary first set of discharge holes 4, the denitrifying agent enters the second set of discharge holes 5 from the hopper 7. It is then blocked by the third-stage discharge plate 3 and will not continue to fall. The third-stage discharge plate 3 also blocks the airflow, preventing backflow. When the rotation continues, when the hopper discharge hole 8, the follower discharge hole 10, and the second set of discharge holes 5 are connected to the stationary third set of discharge holes 6, the denitrifying agent enters the third set of discharge holes 6 from the second set of discharge holes 5. At this time, the airflow is blocked by the first-stage discharge plate 1, preventing backflow.

[0112] Therefore, during the rotation process, the five sets of discharge holes—8, 10, 4, 5, and 6—will never be aligned and connected simultaneously, thus completely solving the problem of backflow.

[0113] The surfaces where the feed trays 9, 1 (first-stage feed tray), 2 (second-stage feed tray), and 3 (third-stage feed tray) come into contact are made of polytetrafluoroethylene (PTFE). PTFE is oil-resistant, heat-resistant, and self-lubricating, making it durable and ideal for the rotating surfaces of the feed trays.

[0114] Each feeding tray can be made entirely of polytetrafluoroethylene (PTFE), or only the contact surfaces can have a layer of PTFE, thus saving costs.

[0115] The hopper follow-up feeding tray 9 needs to be fixed on the outer surface of the rear end of the hopper 7 and rotate together with the hopper 7. To achieve this, a set of limiting plates 40 is provided on the outer surface of the rear end of the hopper 7. The set of limiting plates 40 forms a limiting groove 41. The edge of the limiting groove 41 has a first set of limiting planes 42. The outer periphery of the hopper follow-up feeding tray 9 has a second set of limiting planes 43. The hopper follow-up feeding tray 9 is located in the limiting groove 41, so that the front surface of the hopper follow-up feeding tray 9 is attached to the outer surface of the rear end of the hopper 7, and the second set of limiting planes 43 cooperates with the first set of limiting planes 42 to limit the movement.

[0116] Specifically, the cross-section of the hopper follow-up feeding plate 9 is octagonal, and the limiting plate 40 is a triangular plate. The four triangular plates are evenly distributed at a certain distance, forming a limiting groove 41 in the middle. The outer plane of the hopper follow-up feeding plate 9 cooperates with the plane of the limiting plate 40 for limiting.

[0117] A hopper bushing 44 extending obliquely downwards is fixedly installed at the center of the rear outer surface of the hopper 7. The hopper bushing 44 is welded to the rear end of the hopper 7, and the central axis of the hopper bushing 44 coincides with the central axis of the hopper 7. The hopper follow-up feeding disc 9, the first-stage feeding disc 1, and the second-stage feeding disc 2 pass through the hopper bushing 44 through through holes opened in their respective centers. Figure 9 , 10As shown in Figures 1 and 12.

[0118] The first-stage feeding disc 1 is not connected to the hopper bushing 44, thus keeping the first-stage feeding disc 1 stationary. The second-stage feeding disc 2 is connected to the hopper bushing 44 via a follower structure, so that the second-stage feeding disc 2 rotates synchronously with the hopper bushing 44. That is, the hopper 7, the hopper bushing 44, the hopper follower feeding disc 9, and the second-stage feeding disc 2 rotate synchronously.

[0119] A pressure plate 45 is installed on the lower rear side of the second-stage feeding disc 2. The pressure plate 45 is fitted onto the hopper bushing 44. The hopper bushing 44 has an external thread on one side of its rear end, and a nut 47 with a washer 46 is screwed onto the external thread. A feeding disc compression spring 48 is fitted onto the hopper bushing 44 between the pressure plate 45 and the washer 46. The two ends of the feeding disc compression spring 48 press against the pressure plate 45 and the washer 46 respectively. The feeding disc compression spring 48 applies pressure, pressing the second-stage feeding disc 2, the first-stage feeding disc 1, and the hopper follower feeding disc 9 against the outer rear end surface of the hopper 1 through the pressure plate 45, so that the surfaces of the three feeding discs are tightly attached together. The compression force of the feeding disc compression spring 48 can be adjusted by the nut 47, thereby adjusting the tightness between the three feeding discs.

[0120] The aforementioned follower structure may include a keyway 49 and a key 50. The keyway 49 is formed on the hopper bushing 44, and the key 50 can be set in the through hole in the center of the second-stage feeder 2. Through the cooperation of the keyway 49 and the key 50, the second-stage feeder 2 rotates synchronously with the hopper bushing 44.

[0121] Alternatively, the follower structure includes a keyway 49 and a key 50. The keyway 49 is formed on the hopper bushing 44, and the key 50 is set in the through hole in the center of the pressure plate 45. The pressure plate 45 is fixedly connected to the second-stage feed plate 2 by a pin 51.

[0122] Thus, through the aforementioned structures such as the hopper bushing 44, pressure plate 45, nut 47, discharge plate clamping spring 48, and washer 46, the second-stage discharge plate 2, the first-stage discharge plate 1, and the hopper follow-up discharge plate 9 can be assembled together with the hopper 7. Then, the third-stage discharge plate 3 can be assembled.

[0123] When assembling the third-stage unloading tray 3, the center portion of the rear surface of the second-stage unloading tray 2 may have a circular boss 52 that protrudes obliquely downwards. The pressure plate 46 presses against the circular boss 52, and the third-stage unloading tray 3 fits onto the outer periphery of the circular boss 52 through its central through hole, thus assembling the third-stage unloading tray 3. At this time, the thickness of the third-stage unloading tray 3 is equal to the thickness of the circular boss 52, ensuring that the surface at the rear end of the third-stage unloading tray 3 is flat.

[0124] Alternatively, the second-stage feeding disc 2 may not have a circular boss 52. The pressure plate 45 can directly press against the surface of the rear end of the second-stage feeding disc 2, and the third-stage feeding disc 3 can be fitted onto the outer periphery of the pressure plate 45 through a through hole in its center, thus assembling the third-stage feeding disc 3. In this case, the thickness of the third-stage feeding disc 3 is equal to the thickness of the pressure plate 45, ensuring that the surface at the rear end of the third-stage feeding disc 3 is flat.

[0125] The feeder 11 is located on the lower rear side of the third-stage feed tray 3, such as... Figure 15 As shown, the feeder 11 is inclined and has an inclined feeding channel 53 inside. The third-stage feeding plate 3 is fixed on the outer surface of the front end of the feeder 11. The feeder feeding hole 54 is opened on the front end of the feeder 11. The feeder feeding hole 54 is aligned with the third set of feeding holes 6. The denitrification agent enters the feeding channel 53 of the feeder 11 from the third set of feeding holes 6 through the feeder feeding hole 54, and is then blown into the boiler by the wind along the pipeline.

[0126] The diameters of the feeder discharge hole 54, the third set of discharge holes 6, the second set of discharge holes 5, the first set of discharge holes 4, the hopper follow-up discharge hole 10, and the hopper discharge hole 8 are all the same, and they are each distributed on the same circumference of radius R.

[0127] The feeder 11 has a through hole at the middle of its front end. Structures located at the lower rear end of the third-stage feeder 3 (such as the rear of the hopper bushing 44, pressure plate 45, feeder clamping spring 48, washer 46, nut 47, etc.) extend into the feeder 11 through the through hole, ensuring that the rear end of the third-stage feeder 3 is in contact with the outer front end of the feeder 11.

[0128] A hopper support 30 is installed below the hopper 7, and the hopper 7 is inclined on the hopper support 30. A feeder fixing seat 55 is installed on the lower rear side of the feeder 11, such as... Figure 16 As shown, the feeder fixing seat 55 has a square cavity 56 with an open front end. The bottom end of the feeder fixing seat 55 is inclined and fixed on the hopper support 30. The feeding device 100 and the feeder 11 extend into the square cavity 56 from the open front end of the square cavity 56, and the feeder 11 is fixed on the feeder fixing seat 55.

[0129] The hopper 7 is inclined and tends to move downwards and backwards under the influence of gravity. The feeder fixing seat 55 remains fixed, restricting the movement of the hopper 7 downwards and backwards. Under the influence of gravity, the hopper 7, through the cooperation of the feeder fixing seat 55, presses the surfaces of the second-stage feeder 2 and the third-stage feeder 3 tightly together, and presses the third-stage feeder 3 onto the feeder 11.

[0130] The first-stage feeding tray 1 and the third-stage feeding tray 3 need to be fixed and not rotate with the hopper 7. To achieve this, a third set of limiting planes 57 are provided on the outer periphery of the left and / or right sides of the first-stage feeding tray 1, and a fourth set of limiting planes 58 are provided on the outer periphery of the left and / or right sides of the third-stage feeding tray 3. The third set of limiting planes 57 and the fourth set of limiting planes 58 cooperate with the left side wall 59 and / or right side wall 60 of the feeder fixing seat 55 to limit the movement, that is, the first-stage feeding tray 1 and the third-stage feeding tray 3 are stuck and immobilized by the feeder fixing seat 55.

[0131] To mount the feeder 11 onto the feeder mounting base 55, a feeder mounting shaft 62 extending obliquely downwards and backwards is provided at the rear end of the feeder 11. The feeder mounting shaft 62 extends obliquely downwards and backwards from a through hole opened at the rear end of the feeder mounting base 55. A spherical washer 63 is provided on the feeder mounting shaft 62 between the feeder 11 and the feeder mounting base 55. Under the gravity of the hopper 7, the feeder 11 is tightly attached to the feeder mounting base 55 by the spherical washer 63.

[0132] A support baffle 65 is fixedly installed on the outer rear surface of the feeder mounting base 55. The support baffle 65 is located below the feeder mounting shaft 62 and can be connected to the feeder mounting base 55 by bolts. The fixed position of the support baffle 65 is adjustable vertically. The support baffle 65 locks the feeder mounting shaft 62 in a suitable position in the vertical direction, thereby locking the feeder 11 in the vertical direction. At this time, it is required that the mounting holes of the support baffle 65 and the feeder mounting base 55, as well as the through hole on the feeder mounting base 55 to accommodate the feeder mounting shaft 62, are elongated holes in the vertical direction to achieve the adjustable position of the support baffle 65 and the proper locking of the feeder mounting shaft 62.

[0133] A feeder fixing nut 64 is fitted onto the portion of the feeder mounting shaft 62 that extends out of the feeder fixing seat 55. The feeder fixing nut 64 tightens the feeder 11 to the feeder fixing seat 55. The feeder fixing seat 55 can be set up alone or in conjunction with the support baffle 65.

[0134] This invention does not limit the specific structural form of the drive device, as long as it can achieve the tilting and rotation of the hopper 7. In one example, the drive device includes a motor 14 mounted on the hopper support 30 and multiple support wheels 13. The multiple support wheels 13 form a support frame, and the hopper 7 is tilted on the multiple support wheels 13. The lower part of the side wall of the hopper 7 contacts the outer peripheral surface of the support wheels 13. The motor 14 is connected to some or all of the multiple support wheels 13. Under the drive of the motor 14, the support wheels 13 connected to the motor 14 rub against the side wall of the hopper 7 through the outer peripheral surface of the support wheels 13, thereby driving the hopper 7 to rotate around its own central axis by friction.

[0135] Motor 14 can be a variable frequency geared motor. The rotational speed of the hopper 7 is adjusted by a frequency converter through the variable frequency geared motor, thereby adjusting the material discharge rate. The variable frequency geared motor is equipped with a reducer. For example, the power of the variable frequency geared motor is selected as 3-5 kW, the reduction range of the reducer is between 1:10 and 1:60, the frequency conversion speed range is between 10 Hz and 60 Hz, the output speed is 9.6-172.8 r / min, the hopper speed range is 1.1-6.6 r / min, and the hopper discharge rate is 100-660 kg / day.

[0136] Multiple support wheels 13 are distributed on the lower left and right sides of the side wall of the hopper 7. The rotation axes of the multiple support wheels 13 are inclined and parallel to the central axis of the hopper 7, so as to realize the smooth rotation of the hopper 7 along its rotation axis. The motor 14 is connected to the support wheel 13 on the lower left or right side of the side wall of the hopper 7. The support wheel 13 on one side is the drive wheel, and the support wheel 13 on the other side is the driven wheel.

[0137] Furthermore, multiple support wheels 13 are symmetrically distributed on the left and right sides below the side wall of the hopper 7. Each side of the lower side wall of the hopper 7 has at least two support wheels 13. All the support wheels 13 on one side of the lower side wall of the hopper 7 are connected together by a drive shaft 21.

[0138] A pressure roller 22 is provided on the upper side wall of the hopper 7. The pressure roller 22 is mounted on a pressure roller bracket 23, which is fixed on the hopper bracket 30. The rotation axis of the pressure roller 22 is inclined and parallel to the central axis of the hopper 7. The bottom of the outer circumferential surface of the pressure roller 22 is pressed against the top of the side wall of the hopper 7.

[0139] The hopper 7 is pressed down from multiple directions by the support roller 13 and the pressure roller 22 to ensure that the hopper 7 can only rotate along its central axis and prevent the hopper 7 from shaking up, down, left and right.

[0140] The pressure roller support 23 includes two uprights 24 and a crossbeam 25. The two uprights 24 are located on the left and right sides of the hopper 7, and the crossbeam 25 is located above the side wall of the hopper 7 and connected to the two uprights 24, forming a gantry structure. In one example, the gantry structure is inclined and the plane of the gantry structure is perpendicular to the central axis of the hopper 7.

[0141] A pressure roller mounting rod 26 is provided above the side wall of the hopper 7. The pressure roller 22 is mounted on the pressure roller mounting rod 26. The pressure roller mounting rod 26 is located below the crossbeam 25 and is movably mounted on the column 24. A clamping mechanism is provided between the pressure roller mounting rod 26 and the crossbeam 25 to press the pressure roller mounting rod 26 down so that the bottom of the outer circumference of the pressure roller 23 is pressed against the top of the side wall of the hopper 7. The clamping mechanism 27 is elastic and can be a structure such as a compression spring. Its clamping force is adjustable, thereby adjusting the clamping force of the pressure roller 22 on the side wall of the hopper 7.

[0142] Specifically, the first end of the pressure roller mounting rod 26 is rotatably connected to a column, for example, by a hinge. The second end of the pressure roller mounting rod 26 is slidably connected to another column. A clamping spring is located at the second end of the pressure roller mounting rod 26, and the lower and upper ends of the clamping spring 26 are connected to the pressure roller mounting rod 26 and the crossbeam 25, respectively. The second end of the pressure roller mounting rod 26 is pressed downward under the elastic force of the clamping spring, thereby pressing the bottom of the outer peripheral surface of the pressure roller 23 against the top of the side wall of the hopper 7.

[0143] Each of the aforementioned support wheels 13 may include multiple support wheel units arranged side by side to increase the axial dimension of the support wheel 13 and increase the contact area with the hopper 7. The outer circumferential surfaces of the support wheel 13 and the pressure wheel 22 are covered with a material that increases friction, such as rubber.

[0144] In existing technology, a level motor is installed on the silo. When the amount of denitrifying agent in the silo is lower than a set value, an alarm is triggered, and the silo is automatically or manually refilled based on the alarm. However, the alarm structure of the level motor is complex and not sensitive enough. To solve the problems of using level motors in existing technology, and to achieve sensitive and accurate automatic refilling of the silo through a simple structure, one implementation of the present invention is as follows:

[0145] like Figure 8 As shown, a weighing device 31 is provided below the silo support 30. The weighing device 31 is set on the base 61, and the silo support 30 is located on the weighing device 31. The weighing device 31 weighs the total weight of the silo support 30 and its various structures. The weighing device 31 is connected to the external feeding equipment through an electrical signal to feed material into the feeding window 15 of the silo 7.

[0146] When the weight measured by the weighing device 31 is less than the set minimum value (i.e., when the denitrification agent in the silo 7 is insufficient), the weighing device 31 sends a feeding signal to the feeding equipment, controlling the feeding equipment to start operating and feeding the silo 7. During feeding, when the weight measured by the weighing device 31 is greater than the set maximum value (i.e., when enough material has been fed into the silo 7), the weighing device 31 sends a stop feeding signal to the feeding equipment, and the feeding equipment stops operating and no longer feeds the silo 7.

[0147] For example, the weighing device 31 outputs two level signals, one is a low signal of 50 kg and the other is a high signal of 300 kg. When the control system receives the low signal of 50 kg, the feeding equipment is powered on and starts feeding. When the denitrification agent in the hopper 7 reaches 300 kg, the weighing mechanism 31 outputs a high signal. At this time, the control system cuts off the power to the feeding equipment and stops feeding.

[0148] The feeding equipment can be a screw feeder or a negative pressure feeder; this invention does not limit the type of feeding equipment.

[0149] Another way to achieve automatic feeding is:

[0150] like Figure 11 As shown, a balance shaft 32 is provided below the hopper support 30. The balance shaft 32 is horizontally mounted on the base 61 and is perpendicular to the central axis of the hopper 7. The hopper support 30 is mounted on the balance shaft 32 and can swing back and forth along the balance shaft as the axis.

[0151] The balance shaft 32 should be positioned appropriately close to the rear end of the hopper 7. Specifically, the balance shaft 32 is positioned such that when the weight of the denitrifying agent in the hopper 7 exceeds a first preset value, the hopper support 30 swings downward toward the rear end of the hopper 7. Furthermore, the balance shaft 32 should also be positioned such that when the weight of the denitrifying agent in the hopper 7 is less than a second preset value, the hopper support 30 swings downward toward the front end of the hopper 7. The second preset value is less than the first preset value.

[0152] In other words, when there is sufficient denitrification agent in silo 7, the rear end of silo 7 tends to sink, and when there is insufficient denitrification agent in silo 7, the front end of silo 7 tends to sink.

[0153] A first limit switch 33 is provided on one of the front and rear sides of the balance shaft 32. The first limit switch 33 is installed on the base 61 and located below the hopper bracket 30. The first limit switch 33 is connected to the external feeding equipment through an electrical signal.

[0154] Taking the first limit switch 33 located in front of the balance shaft 32 as an example, when the denitrification agent in the hopper 7 is sufficient, the rear end of the hopper 7 sinks to the lowest position and the front end of the hopper 7 rises to the highest position. At this time, the hopper support 30 does not contact the first limit switch 33, the first limit switch 33 does not send an electrical signal, and the feeding equipment does not work.

[0155] When the denitrifying agent in hopper 7 is insufficient, the front end of hopper 7 sinks, causing hopper support 30 to trigger the first limit switch 33 downwards. The first limit switch 33 sends an electrical signal to the feeding equipment, and the feeding equipment begins feeding. When sufficient material has been fed, the rear end of hopper 7 sinks, hopper support 30 disengages from the first limit switch 33, and the feeding equipment stops working.

[0156] When the first limit switch 33 is located behind the balance shaft 32, its working process is similar and will not be described in detail.

[0157] Furthermore, such as Figure 13 As shown, a second limit switch 34 can also be installed on one of the front and rear sides of the balance shaft 32. The second limit switch 34 is mounted on the base 61 and located below the hopper support 30. The second limit switch 34 is connected to the external feeding equipment via an electrical signal. That is, the first limit switch 33 and the second limit switch 34 are located on the front and rear sides of the balance shaft 32, respectively, and the feeding is controlled to start or stop through the two limit switches. When the denitrification agent is insufficient, the front end of the hopper 7 sinks and triggers one limit switch to start feeding. When sufficient material is fed, the rear end of the hopper 7 sinks and triggers the other limit switch to stop feeding. This cycle continues.

[0158] Or, such as Figure 11 As shown, a support block 35 can also be provided on one of the front and rear sides of the balance shaft 32. The support block 35 is installed on the base 61 and located below the hopper support 30 to provide support for the hopper support 30. Preferably, the support block 35 is located on the rear side of the balance shaft 32. Since the rear end of the hopper 7 sinks for most of the time, if a limit switch is set, it is easy to be damaged by pressure over a long period of time. Therefore, only one limit switch is set on the front side of the balance shaft 32, and the support block 35 is set on the rear side of the balance shaft 32 to provide long-term support for the rear side of the hopper support 30.

[0159] The rear end of the hopper 7 is connected to a counterweight block located outside the hopper 7. The amount of material fed by the feeding device each time is adjusted by the counterweight block 36. When the counterweight block 36 is lighter, more material is fed each time, and vice versa. The counterweight block 36 can be set on the part of the feeder mounting shaft 62 that extends out of the feeder fixing seat 55, that is, on the end of the feeder mounting shaft 62.

[0160] The hopper support 30 may include an inclined structure 36 and a flat structure 37. The hopper 7, motor 14, support wheel 13, and pressure wheel support 23 are all mounted on the inclined structure 36, which provides a suitable tilt angle for the hopper 7. The flat structure 37 is connected below the inclined structure 36 and is used to cooperate with structures such as the weighing device 31, balance shaft 32, feeder fixing seat 55, and limit switch.

[0161] The silo 7 has an insulation layer 38 installed on its walls. Specifically, the insulation layer 38 can be installed on the inner surface of the rear end, the inner surface of the front end, and the inner surface of the side walls of the silo 7. An electric heating element 39 is installed within the insulation layer 38. The insulation layer 38 and the electric heating element 39 prevent condensation from causing the denitrification agent to clump. The electric heating element has a power of 11kW and a temperature control range of 15–65℃ that can be arbitrarily set.

[0162] In this invention, the feed window 15 can be circular in shape, and a screen 28 is provided on the feed window 15. The screen 28 is a cylindrical structure with an open front end, and screen holes are provided on the rear end and sides of the screen 28. Figure 14 As shown. The front end of the screen 28 is connected to the feed window 15, and the rear end and sides of the screen 28 extend into the hopper 7.

[0163] The screen 28 serves two purposes: firstly, it intercepts large particles of impurities in the denitrification agent added to the hopper 7. Secondly, if the added denitrification agent is already agglomerated, the agglomerated agent collides and rubs against the screen 28 as the hopper 7 rotates, thereby breaking up the agglomerated agent. Finally, any agglomerated agents that cannot be broken up can be removed from the screen 28 to prevent them from entering the hopper 7 and affecting the feeding process.

[0164] To facilitate the connection of the screen 28, several connecting plates 29 are provided on the outer periphery of the front end of the screen 28. The connecting plates 29 extend outward from the outer periphery of the front end of the screen 28 and are connected to the hopper 7 on the outer periphery of the feed window 15 by bolts, that is, fixed on the outer surface of the front end of the hopper 7.

[0165] A specific example of the actual use of the feed assembly of the dry denitrification equipment of the present invention is as follows: Figure 17 As shown. The top of the feeder 11 is connected to the blower 12 via a pipe, and the bottom of the feeder 11 is connected to the boiler via a pipe.

[0166] During the rotation of the silo 7, the denitrification agent enters the feeding device 100 from the corresponding silo discharge hole 8 at the rear end of the silo 7, and is then transferred to the feeder 11 by the feeding device 100. The denitrification agent is then blown into the boiler along the pipeline by the wind generated by the blower 12, thereby achieving denitrification.

[0167] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A feeding assembly for a dry denitrification device, characterized in that, It includes a hopper, a feeding device and a dropper. The hopper is inclined with its rear end facing down and its front end facing up, so that the central axis of the hopper is inclined relative to the horizontal direction. The hopper is connected to a drive device that drives the hopper to rotate around its own central axis. The hopper has a feeding window at the front end and a set of hopper discharge holes at the rear end. The discharge device is inclinedly disposed on the outer surface of the rear end of the hopper, and the dropper is inclinedly disposed below and behind the discharge device. The feeding device includes a first-stage feeding plate, a second-stage feeding plate, and a third-stage feeding plate arranged in a series of inclined sections from the front top to the rear bottom. The surfaces of the first-stage feeding plate, the second-stage feeding plate, and the third-stage feeding plate that come into contact with each other are in close contact. The first-stage feeding tray, the second-stage feeding tray, and the third-stage feeding tray are respectively provided with a first set of feeding holes, a second set of feeding holes, and a third set of feeding holes, which respectively penetrate through the thickness direction of the first-stage feeding tray, the second-stage feeding tray, and the third-stage feeding tray; The first-stage feeding disc, the second-stage feeding disc, and the third-stage feeding disc rotate relative to each other. When they rotate relative to each other until the first set of feeding holes and the second set of feeding holes are connected, the second set of feeding holes and the third set of feeding holes are not connected. When they rotate relative to each other until the second set of feeding holes and the third set of feeding holes are connected, the first set of feeding holes and the second set of feeding holes are not connected.

2. The feed assembly of the dry denitrification equipment according to claim 1, characterized in that, A set of guide plates is fixedly installed on the inner rear surface of the hopper, which are matched one by one with a set of hopper discharge holes. The guide plates are arranged perpendicularly or inclined to the inner rear surface of the hopper. The inner end of each guide plate extends to the discharge port of the hopper that it matches, and the outer end extends outward at the rear end of the hopper. Each guide plate is located behind the discharge port of the hopper that it matches in the rotation direction of the hopper. The guide plate guides the denitrification agent inward to the discharge port of the hopper.

3. The feeding assembly of the dry denitrification equipment according to claim 2, characterized in that, A baffle plate is connected to the guide plate near its inner end. The baffle plate is located inside the discharge hole of the hopper. The baffle plate and the guide plate form an outward-facing V-shaped baffle structure at their connection. The discharge hole of the hopper is located outside the V-shaped baffle structure. The V-shaped baffle structure blocks the denitrifying agent that is guided from the guide plate to the inside at the discharge hole of the hopper outside the V-shaped baffle structure.

4. The feed assembly of the dry denitrification equipment according to claim 3, characterized in that, The hopper has multiple discharge holes and guide plates, and the baffle plate corresponding to each guide plate is a part of the inner side of other guide plates.

5. The feed assembly of the dry denitrification equipment according to claim 2, characterized in that, A material-pushing plate is fixedly installed on the inner surface of the side wall of the hopper. The front end and rear end of the material-pushing plate extend toward the front end and rear end of the hopper, respectively. The cross-section at the connection between the material-pushing plate and the inner surface of the side wall of the hopper is perpendicular or inclined to the material-pushing plate.

6. The feed assembly for the dry denitrification equipment according to claim 5, characterized in that, The rear end of the feeding plate is connected to the outer end of the guide plate, and the denitrifying agent sliding towards its rear end on the feeding plate enters the guide plate from the connection point.

7. The feed assembly of the dry denitrification equipment according to any one of claims 1-6, characterized in that, The discharge holes of the hopper, the first set of discharge holes, the second set of discharge holes, and the third set of discharge holes are evenly distributed on a circle with a radius of R, centered on the rear end of the hopper, the first-stage discharge plate, the second-stage discharge plate, and the third-stage discharge plate. The centers of the rear end of the hopper, the first-stage discharge plate, the second-stage discharge plate, and the third-stage discharge plate are all located on the central axis of the hopper.

8. The feed assembly for the dry denitrification equipment according to claim 7, characterized in that, The first and third feeding trays are fixed, while the second feeding tray rotates around the central axis of the hopper. The first and third sets of feeding holes are staggered.

9. The feed assembly for the dry denitrification equipment according to claim 8, characterized in that, A hopper follow-up feeding plate is provided between the first-stage feeding plate and the rear end of the hopper. The hopper follow-up feeding plate is fixed on the outer surface of the rear end of the hopper, and the surfaces of the hopper follow-up feeding plate and the first-stage feeding plate that are in contact with each other are in close contact. The hopper has a set of follow-up feeding holes on its follow-up feeding plate. The hopper feeding holes, the follow-up feeding holes and the second set of feeding holes are aligned. The hopper, the hopper follow-up feeding plate and the second feeding plate all rotate synchronously around the central axis of the hopper.

10. The feed assembly for the dry denitrification equipment according to claim 9, characterized in that, The surfaces of the feed tray, the first-stage feed tray, the second-stage feed tray, and the third-stage feed tray that come into contact with each other are made of polytetrafluoroethylene (PTFE).

11. The feed assembly for the dry denitrification equipment according to claim 9, characterized in that, A set of limiting plates is provided on the outer surface of the rear end of the hopper, forming a limiting groove. The edge of the limiting groove has a first set of limiting planes. The outer periphery of the hopper follow-up feeding tray has a second set of limiting planes. The hopper follow-up feeding tray is located in the limiting groove, so that the front surface of the hopper follow-up feeding tray is attached to the outer surface of the rear end of the hopper, and the second set of limiting planes cooperates with the first set of limiting planes to limit movement.

12. The feed assembly of the dry denitrification equipment according to claim 9, characterized in that, A hopper bushing extending obliquely downward is fixedly provided on the center of the outer surface of the rear end of the hopper. The central axis of the hopper bushing coincides with the central axis of the hopper. The hopper follow-up feeding plate, the first-stage feeding plate and the second-stage feeding plate pass through the hopper bushing through through holes opened in their respective centers. The first-stage feeding disc is not connected to the hopper bushing, and the second-stage feeding disc is connected to the hopper bushing through a follower structure, so that the second-stage feeding disc rotates synchronously with the hopper bushing.

13. The feed assembly for the dry denitrification equipment according to claim 12, characterized in that, A pressure plate is provided on the lower rear side of the second-stage feeding disc. The pressure plate is sleeved on the hopper bushing. An external thread is provided on one side of the rear end of the hopper bushing. A nut with a washer is screwed onto the external thread. A feeding disc clamping spring is sleeved on the hopper bushing between the pressure plate and the washer. The feeding disc clamping spring presses the second-stage feeding disc, the first-stage feeding disc, and the hopper follow-up feeding disc against the outer surface of the rear end of the hopper through the pressure plate. The nut adjusts the clamping force of the feeding disc clamping spring.

14. The feed assembly of the dry denitrification equipment according to claim 13, characterized in that, The follower structure includes a keyway and a key. The keyway is formed on the hopper bushing, and the key is set in the through hole in the center of the second-stage feed tray. Alternatively, the follower structure includes a keyway and a key. The keyway is formed on the hopper bushing, and the key is disposed in a through hole in the center of the pressure plate. The pressure plate is fixedly connected to the second-stage feed plate by a pin.

15. The feed assembly for the dry denitrification equipment according to claim 13, characterized in that, The second-stage feeding disc has a circular boss that protrudes obliquely downward on the center portion of the rear end surface. The pressure plate presses on the circular boss, and the third-stage feeding disc is fitted onto the outer periphery of the circular boss through a through hole in its center. Alternatively, the pressure plate presses against the surface of the rear end of the second-stage feeding plate, and the third-stage feeding plate is fitted onto the outer periphery of the pressure plate through a through hole in its center.

16. The feed assembly for the dry denitrification equipment according to claim 9, characterized in that, The feeder is located on the lower rear side of the third-stage feed plate. The feeder is inclined and has an inclined feeding channel inside. The third-stage feed plate is fixed on the outer surface of the front end of the feeder. A feeder feeding hole is opened on the front end of the feeder, and the feeder feeding hole is aligned with the third set of feeding holes.

17. The feed assembly for the dry denitrification equipment according to claim 16, characterized in that, The front end of the feeder has a through hole in the middle. The rear end surface of the third-stage feed tray is attached to the front end outer surface of the feeder. A structure on the rear side of the rear end surface of the third-stage feed tray extends into the feeder through the through hole.

18. The feed assembly for the dry denitrification equipment according to claim 16, characterized in that, A hopper support is provided below the hopper, and the hopper is inclined on the hopper support; a feeder fixing seat is provided on the lower rear side of the feeder, and the feeder fixing seat has a square cavity with an open front end. The bottom end of the feeder fixing seat is inclined and fixed on the hopper support. The feeding device and the feeder extend into the square cavity from the open front end of the square cavity, and the feeder is fixed on the feeder fixing seat.

19. The feed assembly for the dry denitrification equipment according to claim 18, characterized in that, A third set of limiting planes is provided on the outer periphery of the left and / or right sides of the first-stage feeding tray, and a fourth set of limiting planes is provided on the outer periphery of the left and / or right sides of the third-stage feeding tray. The third and fourth sets of limiting planes cooperate with the left and / or right walls of the feeding device fixing seat for limiting.

20. The feed assembly of the dry denitrification equipment according to claim 18, characterized in that, The hopper has a cylindrical structure. The driving device includes a motor and multiple support wheels mounted on the hopper support. The hopper is inclined on the multiple support wheels, and the lower part of the side wall of the hopper contacts the outer peripheral surface of the support wheels. The motor is connected to some or all of the multiple support wheels. The support wheels connected to the motor drive the hopper to rotate around its own central axis by friction under the drive of the motor.

21. The feed assembly of the dry denitrification equipment according to claim 20, characterized in that, Multiple support wheels are distributed on the lower left and right sides of the side wall of the silo. The rotation axes of the multiple support wheels are inclined and parallel to the central axis of the silo. The motor is connected to the support wheel on the lower left or right side of the side wall of the silo.

22. The feed assembly for the dry denitrification equipment according to claim 20, characterized in that, A pressure roller is provided above the side wall of the silo. The pressure roller is mounted on a pressure roller bracket, which is fixed to the silo bracket. The rotation axis of the pressure roller is inclined and parallel to the central axis of the silo. The bottom of the outer circumferential surface of the pressure roller is pressed against the top of the side wall of the silo.

23. The feed assembly of the dry denitrification equipment according to claim 22, characterized in that, The pressure roller support includes two columns and one crossbeam. The two columns are located on the left and right sides of the hopper, and the crossbeam is located above the side wall of the hopper and connected to the two columns. A pressure roller mounting rod is provided above the side wall of the silo. The pressure roller is mounted on the pressure roller mounting rod. The pressure roller mounting rod is located below the crossbeam and is movably mounted on the column. A clamping mechanism is provided between the pressure roller mounting rod and the crossbeam to press the pressure roller mounting rod down so that the bottom of the outer circumference of the pressure roller is pressed against the top of the side wall of the silo.

24. The feed assembly of the dry denitrification equipment according to claim 23, characterized in that, The first end of the pressure roller mounting rod is rotatably connected to a column, and the second end of the pressure roller mounting rod is slidably connected to another column. The clamping mechanism is a clamping spring, which is located at the second end of the pressure roller mounting rod. The lower and upper ends of the clamping spring are connected to the pressure roller mounting rod and the crossbeam, respectively. Under the elastic force of the clamping spring, the second end of the pressure roller mounting rod presses the bottom of the outer circumference of the pressure roller against the top of the side wall of the silo.

25. The feed assembly of the dry denitrification equipment according to claim 18, characterized in that, A weighing device is installed below the hopper support, the weighing device is mounted on the base, the hopper support is located on the weighing device, and the weighing device is used to connect to external feeding equipment via an electrical signal.

26. The feed assembly of the dry denitrification equipment according to claim 18, characterized in that, A balance shaft is provided below the hopper support. The balance shaft is horizontally positioned and perpendicular to the central axis of the hopper. The hopper support is mounted on the balance shaft and can swing back and forth along the balance shaft. The position of the balance shaft is set such that when the weight of the denitrifying agent in the silo exceeds a first set value, the silo support swings downward toward the rear end of the silo; and when the weight of the denitrifying agent in the silo is less than a second set value, the silo support swings downward toward the front end of the silo; the second set value is less than the first set value. A first limit switch is provided on one of the front and rear sides of the balance shaft. The first limit switch is located below the hopper support and is used to connect to an external feeding device via an electrical signal.

27. The feed assembly for the dry denitrification equipment according to claim 26, characterized in that, A second limit switch or support block is provided on one side of the front and rear sides of the balance shaft. The second limit switch or support block is located below the hopper support. The second limit switch is used to connect to external feeding equipment via an electrical signal.

28. The feed assembly for the dry denitrification equipment according to claim 27, characterized in that, The rear end of the hopper is connected to a counterweight located outside the hopper.

29. The feed assembly for the dry denitrification equipment according to claim 28, characterized in that, The rear end of the feeder is provided with a feeder mounting shaft extending obliquely downward. The feeder mounting shaft extends obliquely downward from a through hole opened on the rear end of the feeder fixing seat. A spherical washer is provided on the feeder mounting shaft between the feeder and the feeder fixing seat.

30. The feed assembly of the dry denitrification equipment according to claim 29, characterized in that, A support baffle is fixedly provided on the outer surface of the rear end of the feeder fixing seat. The support baffle is located below the feeder mounting shaft. The fixed position of the support baffle is adjustable up and down. The support baffle locks the feeder mounting shaft in the up and down direction. And / or, a material feeder fixing nut is fitted onto the portion of the material feeder mounting shaft that extends out of the material feeder fixing seat, and the material feeder fixing nut tightens the material feeder to the material feeder fixing seat.

31. The feed assembly of the dry denitrification equipment according to claim 29, characterized in that, The counterweight is disposed on the portion of the feeder mounting shaft that extends out of the feeder fixing seat.

32. The feed assembly of the dry denitrification equipment according to any one of claims 1-6, characterized in that, The feed window is circular in shape and is equipped with a screen. The screen is a cylindrical structure with an open front end. Screen holes are provided on the rear end and sides of the screen. The front end of the screen is connected to the feed window, and the rear end and sides of the screen extend into the hopper.

33. The feed assembly of the dry denitrification equipment according to any one of claims 1-6, characterized in that, The silo wall is provided with an insulation layer, and an electric heating element is installed inside the insulation layer.

Images