Pulverized coal additive device for thermal power generation and adding method thereof

Abstract

The invention provides a pulverized coal additive device for thermal power generation, belongs to the technical field of thermal power generation, and discloses the pulverized coal additive device for thermal power generation, which comprises a mixing main pipe used for pneumatic conveying of pulverized coal, and one end of the mixing main pipe is provided with an adding nozzle. A plurality of connecting holes are formed in one side of a shell of the main mixing pipe in the length direction of the main mixing pipe, an adding pipe perpendicular to the main mixing pipe is inserted into each connecting hole, a groove is formed in the side wall of each adding pipe and formed in the windward side in the main mixing pipe, and a power mechanism is arranged in each groove. According to the invention, the mixing main pipe and the plurality of adding pipes inserted into the mixing main pipe are designed, the power mechanism of the mixing main pipe is mounted on the windward side in the mixing main pipe, and the adjusting mechanism can be driven to work through the power mechanism, so that an additive in the second chamber is extruded at the discharge plate on the leeward side; and the storage mechanism is mounted on the adding pipe, so that an additive can be supplemented in real time, and the device can be conveniently used for a long time.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and more specifically, to a coal powder additive device and its addition method for thermal power generation. Background Technology

[0003] Power plants are increasingly focusing on fuel utilization and energy conservation and emission reduction. In order to improve power generation efficiency, they often add some additives to the combustion furnace to ensure combustion efficiency. However, the existing addition methods make the additives not evenly distributed and unable to fully contact the coal powder, resulting in the additives not being able to fully react in the first place and the utilization rate being relatively low. Summary of the Invention

[0004] The purpose of this invention is to provide a coal powder additive device and its addition method for thermal power generation, which can solve the above-mentioned problems.

[0005] This invention discloses a coal powder additive device for thermal power generation, including a mixing main pipe for pneumatic conveying of coal powder, and a feeding nozzle installed at one end of the mixing main pipe.

[0006] The mixing main pipe has several connection holes along its length on one side of its housing. Each connection hole is fitted with an addition pipe that is perpendicular to the mixing main pipe. The side wall of the addition pipe has a groove, which is located on the windward side inside the mixing main pipe. A power mechanism is located inside the groove.

[0007] The addition tube is equipped with a flexible partition, which divides the addition tube into a first chamber and a second chamber with variable volume. The second chamber stores powdered additives. The leeward side of the addition tube is a discharge plate with several discharge holes that connect to the second chamber.

[0008] An adjustment mechanism is also installed on the addition tube. The adjustment mechanism is used to squeeze the flexible partition and squeeze out the additive stored in the second chamber. The adjustment mechanism is linked to the power mechanism.

[0009] The top of the addition tube is also equipped with a storage mechanism for replenishing additives into the second chamber.

[0010] Furthermore, the power mechanism includes a rotating shaft and several propellers mounted on the rotating shaft, wherein the rotating shaft is rotatably connected in a groove along the length of the adding tube.

[0011] Furthermore, the adjustment mechanism includes a perforation in the housing, a movable push rod that slides through the perforation, one end of the movable push rod extending into the first chamber and abutting against the flexible partition, and the other end of the movable push rod located in the groove. The adjustment mechanism also includes a cam fitted on the outside of the rotating shaft, the outer ring surface of the cam being used to abut against the end of the movable push rod located in the groove.

[0012] Furthermore, a stirring mechanism is also provided in the second chamber. The stirring mechanism includes a drive shaft, a spiral stirring blade, and a transmission unit that is connected to the rotating shaft. The drive shaft is rotatably installed in the second chamber along the length of the adding tube, the spiral stirring blade is arranged along the length of the drive shaft, and the transmission unit is located outside the adding tube, with its power output end connected to the drive shaft.

[0013] Furthermore, the storage mechanism includes a hopper fixed to the top of the addition tube, a discharge hole opened on the shell of the addition tube, and a turning unit for turning the additives stored in the hopper, wherein the hopper is conical and its bottom end is covered around the port of the discharge hole.

[0014] The material turning unit includes a mounting hole opened in the housing of the adding tube, a boss fixed to the top of the drive shaft, and a push rod that is longitudinally slidably connected to the inner wall of the hopper. The top surface of the boss is an uneven annular curved surface, and the bottom end of the push rod abuts against the top surface of the boss.

[0015] Furthermore, two feeding holes are symmetrically arranged and correspond to the number of top rods. The cross-section of the feeding holes is rectangular, and a baffle plate is movably installed in each feeding hole. The top of the baffle plate extends out of the feeding hole and is rotatably connected to a fixed frame. The tops of the two top rods are rotatably connected to connecting rods, and the other end of the connecting rods is movably connected to the corresponding baffle plate. The lifting and lowering of the top rods causes the baffle plate to rotate around its hinge with the fixed frame, so that its movable end abuts against the inner wall of the feeding hole. The bottom surface of the baffle plate is connected to the adjacent inner wall of the feeding hole through a flexible and retractable barrier, so that the material in the hopper slides down from above the baffle plate and passes through the feeding hole.

[0016] Furthermore, the feeding nozzle includes a nozzle tube and a detachable flow equalization mechanism located at the nozzle tube opening. A flow equalization plate is also installed on the inner wall of the nozzle tube opening, with several flow equalization holes evenly distributed on the flow equalization plate.

[0017] Furthermore, the flow equalization mechanism includes a flow divider block and several limiting plates disposed inside the nozzle pipe. The nozzle pipe has a circular cross-section, a through hole is provided at the center of the flow equalization plate, the flow divider block is cylindrical, the inner end of the flow divider block is a conical surface, and the outer end of the flow divider block extends out of the through hole on the flow equalization plate. The limiting plates are circumferentially distributed on the outer ring surface of the flow divider block.

[0018] Furthermore, the inner wall of the nozzle tube located inside the flow equalization plate is fitted with a limiting sleeve via a bearing. The limiting sleeve has several limiting grooves corresponding to the limiting plate. The limiting plate is inserted into the corresponding limiting groove, and the limiting groove has a limiting block that restricts the flow divider block from moving axially inward. The extension direction of the limiting groove and the limiting plate has an angle with the axial direction of the nozzle tube, and the angle is less than °.

[0019] A method for adding pulverized coal additives to a coal powder additive device for thermal power generation includes the following steps:

[0020] Step 1: Install the addition tubes one by one along the length of the mixing main pipe, ensuring that the groove and discharge hole of the addition tube are completely contained within the inner cavity of the mixing main pipe, and fix the position of the addition tubes.

[0021] Step 2: Add sufficient additives to each storage mechanism, and ensure that part of the additives in the storage mechanism enters the second chamber in the corresponding addition tube;

[0022] Step 3: Start the external fan to introduce high-speed airflow into the mixing pipe. The airflow carries the coal powder in the mixing pipe towards one side of the feeding nozzle.

[0023] Step 4: The airflow blows the power mechanism to work, which in turn drives the adjustment mechanism to work, squeezing the flexible partition and thus squeezing out the additive stored in the second chamber. The additive enters the mixing main pipe and mixes with the coal powder, and is finally sprayed out from the feeding nozzle.

[0024] The beneficial effects of this invention are:

[0025] This invention designs a mixing main pipe and several adding pipes inserted into the mixing main pipe. The power mechanism of the mixing main pipe is installed on the windward side inside the mixing main pipe. The power mechanism can drive the adjustment mechanism to work, thereby squeezing the additive in the second chamber at the discharge plate on the leeward side. With the airflow, the additive is fully mixed with the coal powder in the mixing main pipe. The adding pipes are equipped with a storage mechanism to replenish the additive in real time, which is convenient for long-term use of the device.

[0026] The feeding nozzle proposed in this invention is equipped with a detachable flow equalization component, which can facilitate the uniform spraying of the mixture in the mixing main pipe, help improve the combustion effect and make full use of the fuel. At the same time, the flow equalization component can rotate with the airflow, avoiding prolonged contact with high-speed airflow, powdered coal powder and additives, thus preventing surface wear and improving the service life of the device. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is the invention Figure 1Enlarged view of point A;

[0030] Figure 3 This is the invention Figure 1 Enlarged view of point B;

[0031] Figure 4 This is the invention Figure 1 Enlarged view of point C;

[0032] Figure 5 This is a cross-sectional structural diagram of the mixing main pipe of the present invention;

[0033] Figure 6 This is a partial three-dimensional view of the diversion block of the present invention.

[0034] In the diagram: 1. Mixing main pipe; 2. Feeding nozzle; 200. Nozzle pipe; 201. Flow equalization plate; 201. Flow equalization hole; 203. Diverting block; 204. Through hole; 205. Guide surface; 206. Limiting sleeve; 207. Limiting plate; 208. Limiting groove; 3. Adding pipe; 300. Flexible partition; 301. Discharge plate; 302. Discharge hole; 303. Top plate; 304. Groove; 305. Positioning protrusion; 306. Positioning slot; 4. Storage mechanism; 400. Discharge hole; 401. Mounting hole; 402. Boss; 403. Top rod; 404. Connecting rod; 405. Baffle plate; 500. Drive shaft; 501. Spiral mixing blade; 600. Rotating shaft; 601. Propeller; 602. Cam; 701. Movable top rod; 702. Return spring; 703. Retaining ring; 704. Perforation. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0041] In this invention, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] Example:

[0043] like Figure 1-6This embodiment provides a coal powder additive device for thermal power generation, including a mixing main pipe 1 for pneumatic conveying of coal powder, and a feeding nozzle 2 installed at one end of the mixing main pipe 1. During operation, strong air is introduced into the mixing main pipe 1 to facilitate the blowing of coal powder within the mixing main pipe 1 towards the feeding nozzle 2.

[0044] The mixing main pipe 1 has several connection holes along its length on one side of its shell. Each connection hole is fitted with an additive pipe 3, which is perpendicular to the mixing main pipe 1. The side wall of the additive pipe 3 has a groove 304 located on the windward side inside the mixing main pipe 1. A power mechanism is housed within the groove 304. This structure allows for convenient addition of additives to each additive pipe 3, facilitating mixing of the additives with pulverized coal within the mixing main pipe 1. The pulverized coal is then fed into the combustion chamber together, thus aiding combustion.

[0045] The addition tube 3 is equipped with a flexible partition 300, which divides the addition tube 3 into a first chamber and a second chamber with variable volumes. The second chamber stores powdered additives. The leeward side of the addition tube 3 is a discharge plate 301, on which several discharge holes 302 connected to the second chamber are evenly distributed. The aforementioned flexible partition can be made of rubber, which facilitates the extrusion of the powdered additives stored in the second chamber by utilizing its elasticity, thus facilitating mixing.

[0046] An adjustment mechanism is also installed on the addition tube 3. This mechanism is used to compress the flexible partition 300 and extrude the additive stored in the second chamber. The adjustment mechanism is linked to the power mechanism. The aforementioned adjustment mechanism is designed to automatically extrude the additive rack from the second chamber.

[0047] The top of the addition tube 3 is also equipped with a storage mechanism 4 for replenishing additives into the second chamber. The storage mechanism 4 allows for easy and real-time replenishment of additives into the second chamber.

[0048] In this invention, the power mechanism includes a rotating shaft 600 and a plurality of propellers 601 mounted on the rotating shaft 600. The rotating shaft 600 is rotatably connected to the groove 304 along the length of the adding pipe 3. The propellers rotate under the action of wind in the mixing main pipe 1, thereby driving the rotating shaft 600 to rotate. The rotating shaft 600 drives the adjusting mechanism to work through the linkage mechanism.

[0049] In an optional embodiment, the adjusting mechanism includes a perforation in the housing, a movable push rod 701 slidably inserted into the perforation, one end of the movable push rod 701 extending into the first chamber and abutting against the flexible partition 300, and the other end of the movable push rod 701 located in the groove 304. The adjusting mechanism also includes a cam 602 fitted on the outside of the rotating shaft 600, the outer ring surface of the cam 602 abutting against the end of the movable push rod 701 located in the groove 304. By the contact between the outer ring surface of the cam 602 and one end of the movable push rod, the movable push rod intermittently presses against the flexible partition, facilitating the extrusion of the additive in the second chamber.

[0050] To further facilitate the loosening of the additives in the second chamber and to make it easier for the adjusting mechanism to extrude the powdered additives, a stirring mechanism is also provided in the second chamber. The stirring mechanism includes a drive shaft 500, a spiral stirring blade 501, and a transmission unit that is connected to the rotating shaft 600. The drive shaft 500 is rotatably installed in the second chamber along the length of the addition tube 3, the spiral stirring blade 501 is arranged along the length of the drive shaft 500, and the transmission unit is located outside the addition tube 3, with its power output end connected to the drive shaft 500.

[0051] In this invention, the storage mechanism 4 includes a hopper fixed to the top of the addition pipe 3, a discharge hole 400 formed on the housing of the addition pipe 3, and a turning unit for turning the additives stored in the hopper. The hopper is conical in shape, with its bottom end covering the port of the discharge hole 400. The storage mechanism 4 can replenish the additives in the second chamber in a timely manner when the amount decreases, ensuring stable and reliable operation without the need for manual addition, thus saving manpower and resources.

[0052] In this design, the material-turning unit includes a mounting hole 401 inside the housing of the feeding pipe 3, a boss 402 fixed to the top of the drive shaft 500, and a push rod 403 slidably connected longitudinally to the inner wall of the hopper. The top surface of the boss 402 is an uneven annular curved surface, and the bottom end of the push rod 403 abuts against the top surface of the boss 402. The boss 402 rotates with the drive shaft, driving the push rod 403 to reciprocate up and down, preventing blockages during material feeding and making the operation more stable and reliable.

[0053] In a preferred embodiment of this scheme, two discharge holes 400 are symmetrically provided and correspond to the number of top rods 403. The cross-section of the discharge hole 400 is rectangular, and a baffle plate 405 is movably provided in each discharge hole 400. The top end of the baffle plate 405 extends out of the discharge hole 400 and is rotatably connected to a fixed frame. The top ends of the two top rods 403 are respectively rotatably connected to connecting rods 404. The other end of the connecting rods 404 is movably connected to the corresponding baffle plate 405. The lifting and lowering of the top rods 403 drives the baffle plate 405 to rotate around its hinge with the fixed frame, so that its movable end abuts against the inner wall of the discharge hole 400. The bottom surface of the baffle plate 405 is connected to the adjacent inner wall of the discharge hole 400 through a flexible and retractable barrier, so that the material in the hopper slides down from above the baffle plate 405 and passes through the discharge hole 400. The above structure allows the additive to slide directly from above the baffle plate 405 into the discharge hole 400, making it easy to adjust the discharge rate.

[0054] In this invention, the feeding nozzle 2 further includes a nozzle tube 200 and a flow equalization mechanism detachably disposed at the inlet of the nozzle tube 200. A flow equalization plate 201 is also installed on the inner wall of the nozzle tube 200 inlet, and a plurality of flow equalization holes 201 are evenly distributed on the flow equalization plate 201. Through the aforementioned flow equalization mechanism, the mixture in the mixing main tube can be evenly added to the combustion chamber, resulting in better combustion performance.

[0055] Please refer to Figure 2 Furthermore, the flow equalization mechanism includes a flow divider block 203 disposed within the nozzle pipe 200 and several limiting plates 207. The nozzle pipe 200 has a circular cross-section, a through hole 204 is provided at the center of the flow equalization plate 201, the flow divider block 203 is cylindrical, the inner end of the flow divider block 203 is a conical surface, and the outer end of the flow divider block 203 extends out of the through hole 204 on the flow equalization plate 201. The limiting plates 207 are circumferentially distributed on the outer ring surface of the flow divider block 203.

[0056] Please refer to Figure 2The inner wall of the nozzle pipe 200, located inside the flow equalization plate 201, is rotatably fitted with a limiting sleeve 206 via a bearing. The limiting sleeve 206 has several limiting grooves 208 corresponding to the limiting plate 207. The limiting plate 207 is inserted into the corresponding limiting groove 208, and the limiting groove 208 has a limiting block that restricts the inward axial movement of the diversion block 203. The extending directions of the limiting grooves 208 and the limiting plate 207 form an angle with the axial direction of the nozzle pipe 200, and this angle is less than 30°. This structure ensures that when the airflow blows towards the limiting plate 207, a certain angle allows the limiting plate 207 to rotate, thus preventing damage to the surface of the diversion block 203 caused by the high-speed airflow carrying powdered coal dust and additives, which would reduce the lifespan of the device. Therefore, this structure significantly extends the lifespan of the equipment.

[0057] The present invention also proposes a method for adding pulverized coal additives to a coal powder additive device for thermal power generation, comprising the following steps:

[0058] Step 1: Install the addition tubes 3 one by one along the length of the mixing main pipe 1, and make sure that the groove of the addition tube 3 and the discharge hole 302 are completely contained in the inner cavity of the mixing main pipe 1, and fix the position of the addition tube 3.

[0059] Step 2: Add sufficient additives to each storage mechanism 4, and allow part of the additives in the storage mechanism 4 to enter the second chamber in the corresponding addition tube 3.

[0060] Step 3: Start the external fan and introduce high-speed airflow into the mixing main pipe 1. The airflow carries the coal powder in the mixing main pipe 1 towards one side of the feeding nozzle 2.

[0061] Step 4: The airflow blows the power mechanism to work, which in turn drives the adjustment mechanism to work, squeezing the flexible partition 300, thereby squeezing out the additive stored in the second chamber. The additive enters the mixing main pipe 1 and mixes with the coal powder, and is finally sprayed out from the feeding nozzle 2.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A coal powder additive device for thermal power generation, comprising a mixing main pipe (1) for pneumatic conveying of coal powder, characterized in that: A feeding nozzle (2) is installed at one end of the mixing main pipe (1); The mixing main pipe (1) has several connection holes along its length on one side of its shell. Each connection hole is fitted with an addition pipe (3) that is perpendicular to the mixing main pipe (1). The side wall of the addition pipe (3) has a groove (304). The groove (304) is located on the windward side inside the mixing main pipe (1). A power mechanism is provided inside the groove (304). The addition tube (3) is provided with a flexible partition (300), which divides the addition tube (3) into a first chamber and a second chamber with variable volume. The second chamber stores powdered additives. The leeward side of the addition tube (3) is a discharge plate (301), and the discharge plate (301) is evenly distributed with a number of discharge holes (302) that connect the second chamber. An adjustment mechanism is also installed on the addition tube (3). The adjustment mechanism is used to squeeze the flexible partition (300) to squeeze out the additive stored in the second chamber. The adjustment mechanism and the power mechanism are linked. The top of the addition tube (3) is also provided with a storage mechanism (4) for replenishing the additive into the second chamber.

2. The coal pulverizer additive device for thermal power generation according to claim 2, characterized in that, The power mechanism includes a rotating shaft (600) and a plurality of propellers (601) mounted on the rotating shaft (600), wherein the rotating shaft (600) is rotatably connected in a groove (304) along the length of the adding tube (3).

3. The coal pulverizer additive device for thermal power generation according to claim 2, characterized in that, The adjustment mechanism includes a perforation in the housing and a movable push rod (701) that slides through the perforation. One end of the movable push rod (701) extends into the first chamber and abuts against the flexible partition (300). The other end of the movable push rod (701) is located in the groove (304). The adjustment mechanism also includes a cam (602) fitted on the outside of the rotating shaft (600). The outer ring surface of the cam (602) is used to abut against the end of the movable push rod (701) located in the groove (304).

4. The coal pulverizer additive device for thermal power generation according to claim 3, characterized in that, The second chamber is also provided with a stirring mechanism, which includes a drive shaft (500), a spiral stirring blade (501), and a transmission unit that is connected to the rotating shaft (600). The drive shaft (500) is rotatably installed in the second chamber along the length of the adding tube (3), the spiral stirring blade (501) is arranged along the length of the drive shaft (500), and the transmission unit is located outside the adding tube (3), and its power output end is connected to the drive shaft (500).

5. A coal pulverized oil additive device for thermal power generation according to claim 1 or 4, characterized in that, The storage mechanism (4) includes a hopper fixed to the top of the addition tube (3), a discharge hole (400) opened on the shell of the addition tube (3), and a turning unit for turning the additive stored in the hopper. The hopper is a conical cylinder and its bottom end is covered around the port of the discharge hole (400). The material turning unit includes a mounting hole (401) opened in the housing of the adding tube (3), a boss (402) fixed to the top of the drive shaft (500), and a push rod (403) that is longitudinally slidably connected to the inner wall of the hopper. The top surface of the boss (402) is an uneven annular curved surface, and the bottom end of the push rod (403) abuts against the top surface of the boss (402).

6. The coal pulverizer additive device for thermal power generation according to claim 5, characterized in that, Two feeding holes (400) are symmetrically provided, corresponding to the number of push rods (403). The cross-section of the feeding hole (400) is rectangular, and a baffle plate (405) is movably installed in each feeding hole (400). The top end of the baffle plate (405) extends out of the feeding hole (400) and is rotatably connected to a fixed frame. The top ends of the two push rods (403) are respectively rotatably connected to connecting rods (404), and the other end of the connecting rods (404) and... The corresponding baffle plate (405) is movably connected, wherein the lifting rod (403) drives the baffle plate (405) to rotate around its hinge with the fixed frame, so that its movable end abuts against the inner wall of the discharge hole (400), and the bottom surface of the baffle plate (405) is connected to the adjacent inner wall of the discharge hole (400) through a flexible and retractable barrier, so that the material in the hopper slides down from above the baffle plate (405) and passes through the discharge hole (400).

7. The coal pulverizer additive device for thermal power generation according to claim 6, characterized in that, The feeding nozzle (2) includes a nozzle tube (200) and a flow equalization mechanism detachably provided at the nozzle tube (200) opening. A flow equalization plate (201) is also installed on the inner wall of the nozzle tube (200) opening, and a plurality of flow equalization holes (201) are evenly distributed on the flow equalization plate (201).

8. The coal pulverizer additive device for thermal power generation according to claim 7, characterized in that, The flow equalization mechanism includes a flow divider block (203) disposed in the nozzle pipe (200) and several limiting plates (207). The nozzle pipe (200) has a circular cross-section. A through hole (204) is provided at the center of the flow equalization plate (201). The flow divider block (203) is cylindrical. The inner end of the flow divider block (203) is a conical surface, and the outer end of the flow divider block (203) extends out of the through hole (204) on the flow equalization plate (201). The limiting plates (207) are circumferentially distributed on the outer ring surface of the flow divider block (203).

9. A coal pulverizer additive device for thermal power generation according to claim 8, characterized in that, The inner wall of the nozzle pipe (200) located inside the flow equalization plate (201) is rotatably sleeved with a limiting sleeve (206) through a bearing. The limiting sleeve (206) has several limiting grooves (208) corresponding to the limiting plate (207). The limiting plate (207) is inserted into the corresponding limiting groove (208), and the limiting groove (208) has a limiting block that restricts the flow diversion block (203) from moving axially inward. The extension direction of the limiting groove (208) and the limiting plate (207) has an angle with the axial direction of the nozzle pipe (200), and the angle is less than 30°.

10. The method for adding pulverized coal additives for thermal power generation according to any one of claims 1-4 and 6-9, characterized in that, Includes the following steps: Step 1: Install the addition tubes (3) one by one along the length of the mixing main pipe (1), and make the groove of the addition tube (3) and the discharge hole (302) completely contained in the inner cavity of the mixing main pipe (1) to fix the position of the addition tube (3); Step 2: Add sufficient additives to each storage mechanism (4) and allow part of the additives in the storage mechanism (4) to enter the second chamber in the corresponding addition tube (3); Step 3: Start the external fan and introduce high-speed airflow into the mixing pipe (1). The airflow carries the coal powder in the mixing pipe (1) towards one side of the feeding nozzle (2). Step 4: The airflow blows the power mechanism to work, drives the adjustment mechanism to work, squeezes the flexible partition (300), thereby squeezing out the additive stored in the second chamber. The additive enters the mixing main pipe (1) and mixes with the coal powder, and finally sprays out from the feeding nozzle (2).

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