An automatic powder making system for thermal power plants

Abstract

The present invention provides an automatic pulverizing system for a thermal power plant, comprising a feed assembly including an automatic coal transport unit; a grinding assembly, wherein the feed port of the grinding assembly is connected to the discharge port of the automatic coal transport unit; a filtering assembly including a coal powder separator, wherein the discharge port of the grinding assembly is connected to the feed port of the coal powder separator, and the coarse powder outlet of the coal powder separator is connected to the grinding assembly; an intermediate storage assembly including an intermediate bin and an induction element arranged in the intermediate bin, wherein the induction element is electrically connected to the automatic coal transport unit, and the intermediate bin is connected to the fine powder outlet of the coal powder separator; and a powder supply assembly connected below the intermediate storage assembly, wherein the discharge port of the powder supply assembly is connected to a combustion furnace. The working efficiency of the coal mill is adjusted by automatically controlling the feed assembly to ensure the high efficiency of the combustion state and the stability of the overall system.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generation, in particular to an automatic powder making system for a thermal power plant. Background Art

[0002] Large coal-fired boiler units in thermal power plants generally use pulverized coal combustion, which is suitable for large boiler capacity and has high combustion efficiency, wider adaptability to coal types and faster load responsiveness. The pulverized coal burns in a suspended state in the furnace, and the combustion process is completed in a short time when the pulverized coal flows through the furnace. From the perspective of ignition stability and system economy, power station boilers have certain requirements on the fineness and dryness of pulverized coal.

[0003] The task of the pulverizing system in a thermal power plant is to grind and dry the raw coal into coal powder with a certain fineness and moisture content, and to deliver the coal powder required for boiler combustion into the furnace for combustion. Since the combustion efficiency of the combustion chamber may change at any time, the coal mill cannot adjust the coal grinding efficiency and combustion efficiency in real time, which will cause the coal mill to have excess capacity or fail to keep up with the combustion efficiency. Therefore, an automated pulverizing system is urgently needed. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the prior art that there is a lack of automatic adjustment and balance of coal grinding and coal burning efficiency, thereby providing an automatic pulverizing system for thermal power plants.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: an automatic pulverizing system for a thermal power plant, comprising: a feeding assembly, including an automatic coal transport unit; a grinding assembly, wherein the feeding port of the grinding assembly is connected to the discharging port of the automatic coal transport unit; a filtering assembly, including a coal powder separator, the discharging port of the grinding assembly is connected to the feeding port of the coal powder separator, and the coarse powder outlet of the coal powder separator is connected to the grinding assembly; an intermediate storage assembly, including an intermediate bin and an induction element arranged in the intermediate bin, the induction element is electrically connected to the automatic coal transport unit, and the intermediate bin is connected to the fine powder outlet of the coal powder separator; and a powder supply assembly, connected below the intermediate storage assembly, and the discharging port of the powder supply assembly is connected to a combustion furnace.

[0007] As a preferred solution of the automatic pulverizing system for thermal power plants described in the present invention, the grinding assembly includes a coal mill and a grinding bowl and a grinding roller arranged inside, a screening plate is arranged below the grinding bowl, a plurality of screening holes are arranged on the screening plate, the screening holes are connected to an inner channel arranged in the screening plate, a corresponding scraper is arranged above the screening plate to rotate with the scraper, the inner channel is connected to a first channel, and the first channel is connected to the coal powder separator.

[0008] As a preferred solution of the automatic powder making system for thermal power plants described in the present invention, the screening disk is in the shape of an arc with an opening upward, a through hole is opened in the center of the screening disk, a coal block separation layer is arranged below the screening disk, an axis is arranged in the center of the coal block separation layer to pass through the central through hole of the screening disk, the diameter of the axis gradually increases from top to bottom, the diameter of the lower end of the axis is equal to the diameter of the central through hole of the screening disk, the surface of the coal block separation layer is inclined outward from the center, the lower end of the coal block separation layer is connected to the first recovery channel, and the first recovery channel is connected to the feed port above the coal mill.

[0009] As a preferred solution of the automatic powder making system for thermal power plants described in the present invention, the grinding assembly also includes two primary fans connected to the first channel and providing wind force to the first channel, and an air preheater is arranged behind one of the primary fans.

[0010] As a preferred solution of the automatic pulverizing system for thermal power plants of the present invention, the automatic coal transport unit comprises a conveyor belt arranged below the coal crusher, and the discharge port of the conveyor belt is arranged at the upper feed port of the coal mill.

[0011] As a preferred solution of the automatic pulverizing system for thermal power plants described in the present invention, the pulverized coal separator is a cyclone separator.

[0012] As a preferred solution of the automatic powder making system for thermal power plants described in the present invention, wherein: the intermediate storage component also includes a bin door opening and closing unit arranged below the intermediate bin, the bin door opening and closing unit includes a double-layer bottom plate arranged below the intermediate bin, the double-layer bottom plate includes a first bottom plate arranged on the upper layer and a second bottom plate arranged on the lower layer, a plurality of gap holes are evenly opened on the first bottom plate, the distance between adjacent gap holes is greater than or equal to the diameter of the gap holes, the positions of the gap holes of the second bottom plate and the first bottom plate are exactly the same and are arranged in a close fit, and the second bottom plate is slidably connected to the first bottom plate.

[0013] As a preferred solution of the automatic powder making system for thermal power plants described in the present invention, wherein: a slide rail is arranged on the first bottom plate, a slide groove is correspondingly arranged on the second bottom plate to engage in the slide rail, a spring is arranged at one end of the slide rail, the spring always drives the gap holes on the second bottom plate to correspond to the interval between the gap holes on the first bottom plate, the deformation length of the spring is a multiple of the diameter of the gap holes, a rack is arranged at the other end of the slide rail to push the second bottom plate, the rack is meshed with a gear, and the gear is sleeved on the rotating shaft of the driving motor.

[0014] As a preferred solution of the automatic powder making system for thermal power plants described in the present invention, the combustion chamber is provided with a detection unit, and the detection unit is electrically connected to the driving motor.

[0015] As a preferred solution of the automatic powder making system for thermal power plants of the present invention, the powder supply assembly includes a second channel connected to the combustion chamber, and a secondary fan blowing toward the combustion chamber is arranged in the second channel.

[0016] The beneficial effects of the present invention are as follows: the working efficiency of the coal mill is adjusted by automatically controlling the feeding component, and the excess coal powder is stored by using the intermediate storage component, so that the powder is blown into the combustion chamber stably and continuously without being affected by the efficiency of the coal mill. At the same time, the powder supply efficiency of the intermediate bin can be adjusted according to the needs of the combustion chamber, thereby ensuring the high efficiency of the combustion state and the stability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 It is the overall system diagram of the flour making system;

[0019] Figure 2 It is a schematic diagram of the structure of the coal mill in the grinding assembly and the filter assembly inside it;

[0020] Figure 3 It is a partial enlarged schematic diagram of the filter component;

[0021] Figure 4 It is a schematic diagram of a half-section structure of an intermediate storage component;

[0022] Figure 5 is a cross-sectional front view of the intermediate storage assembly; DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Example 1

[0026] This embodiment provides an automatic powder making system for a thermal power plant, such as Figure 1 As shown, including,

[0027] A feeding assembly 100 includes an automatic coal transport unit 101; a grinding assembly upper part, wherein the feeding port of the grinding assembly 200 is connected to the discharging port of the automatic coal transport unit 101; a filtering assembly 300 includes a coal powder separator 301, wherein the discharging port of the grinding assembly 200 is connected to the feeding port of the coal powder separator 301, and the coarse powder outlet of the coal powder separator 301 is connected to the grinding assembly 200; an intermediate storage assembly 400 includes an intermediate bin 401 and a sensor 402 arranged in the intermediate bin 401, wherein the sensor 402 is electrically connected to the automatic coal transport unit 101, and the intermediate bin 401 is connected to the fine powder outlet of the coal powder separator 301; and a powder supply assembly 500, which is connected below the intermediate storage assembly 400, and wherein the discharging port of the powder supply assembly 500 is connected to the combustion furnace 501.

[0028] The feeding assembly 100 is used to provide raw materials to the grinding assembly 200, including preliminarily ground coal blocks and other additives. The automatic coal transport unit 101 includes a conveyor belt 101a arranged below the coal block crusher. The discharge port of the conveyor belt 101a is arranged at the upper feed port of the coal mill 201. The automatic coal transport unit 101 is connected to the sensor 402, which is arranged inside the intermediate bin 401. The sensor 402 is a light sensor, which is generally arranged above the intermediate bin 401. When the coal is about to fill the intermediate bin 401, the coal blocks the light, and the sensor 402 receives the signal and transmits it to the automatic coal transport unit 101. The dynamic coal transport unit 101 will stop working, reducing the output of the coal mill 201 to achieve the effect of automatic control; the grinding component 200 is connected to the discharge port of the automatic coal transport unit 101, and is used to crush the coal blocks to achieve the accuracy that can be directly burned. The coal mill 201 generally uses a commonly used grinding bowl 202 coal mill 201; the conventional grinding bowl 202 coal mill 201 can only crush the coal blocks. In this embodiment, we have set a filtering component 300 under the coal grinding component to filter and screen the coal powder produced by the coal mill 201 and other unqualified coal blocks and debris, completing the screening work at one time, and being able to recycle the unqualified coal blocks.

[0029] Furthermore, the intermediate storage component 400 stores qualified coal powder, and when combustion is required, it is supplied to the combustion furnace 501 at a constant efficiency through the powder supply component 500. The efficiency of the coal mill 201 and the combustion furnace 501 are separated by the intermediate storage component 400, and the combustion efficiency in the combustion furnace 501 is more stable and will not change with the efficiency of the coal mill 201. Even if the grinding component 200 is damaged and needs maintenance, the combustion furnace 501 can be temporarily stopped and will not be affected.

[0030] In this embodiment, the pulverizing system is automatically controlled by sequentially connecting and cooperating the feed component 100, the grinding component 200, the filtering component 300, the intermediate storage component 400 and the powder supply component 500. The working efficiency of the grinding component 200 and the combustion furnace 501 do not affect each other, so the combustion efficiency can be kept stable. At the same time, the feed component 100 can be automatically controlled by the coal powder stock inside the intermediate storage component 400, without manual operation, thereby maintaining the working efficiency of the overall system.

[0031] Example 2

[0032] This embodiment is different from the previous embodiment in that Figure 2-3 As shown,

[0033] The grinding assembly 200 uses a conventional grinding bowl 202 coal mill 201, including the coal mill 201 and the grinding bowl 202 and grinding roller 202a arranged inside. The conventional coal mill 201 does not have a screening function, or has a simple screening function. To address this shortcoming, in the present embodiment, a filtering assembly 300 is arranged inside the coal mill 201, including a screening plate 203 arranged below the grinding bowl 202, and a plurality of sieve holes 203a are arranged on the screening plate 203. The sieve holes 203a are connected to an inner channel 203c arranged in the screening plate 203, and a corresponding scraper 204 is arranged above the screening plate 203 to rotate with it. The inner channel 203c is connected to the first channel 205, and the first channel 205 is connected to the coal powder separator 301. The screening disc 203 is in the shape of an arc with an opening facing upward, and a through hole 203b is provided in the center of the screening disc 203. A coal block separation layer 206 is arranged below the screening disc 203, and a shaft 206a is arranged in the center of the coal block separation layer 206 to pass through the central through hole 203b of the screening disc 203. The diameter of the shaft 206a gradually increases from top to bottom, and the diameter of the lower end of the shaft 206a is equal to the diameter of the central through hole 203b of the screening disc 203. The surface of the coal block separation layer 206 is inclined outward from the center, and the lower end of the coal block separation layer 206 is connected to the first recovery channel 207, and the first recovery channel 207 is connected to the feed port above the coal mill 201.

[0034] The grinding roller 202a rotates relative to the grinding bowl 202 to grind the coal blocks that fall in, and the coal blocks fall into the screening plate 203 below through the holes on the grinding bowl 202 after being ground. The screening plate 203 is an arc-shaped inclined surface inclined toward the center, so the coal blocks and coal powder after being ground will slide toward the center, and the sieve holes 203a on the screening plate 203 can only pass through the fine coal powder particles, and the remaining large pieces of coal blocks and impurities cannot pass through the sieve holes 203a on the screening plate 203 and will remain on the screening plate 203. A scraper 204 is provided on the screening disc 203 to rotate relative to the screening disc 203 to scrape the mixture of coal powder and coal blocks to screen the coal powder more thoroughly. An inner channel 203c is provided inside the screening disc 203, and the sieve holes 203a are connected to the inner channel 203c. After the coal powder enters the inner channel 203c, since the inner channel 203c is an inclined surface cut toward the outside, the coal powder will slide to the outside, and then enter the first channel 205 through the opened outlet and enter the coal powder separator 301.

[0035] Furthermore, a coal block separation layer 206 is provided below the screening disc 203. The shaft 206a at the center of the coal block separation layer 206 will block the through hole 203b at the center of the screening disc 203. When a certain amount of large coal blocks and debris accumulate inside the screening disc 203, the coal block separation layer 206 will move downward, driving the shaft 206a to move downward. A large gap is generated between the shaft 206a and the center through hole 203b, causing large coal blocks to fall into the coal block separation layer 206 below. The surface of the coal block separation layer 206 is also inclined from the center to the outside, so that large coal blocks slide outward and fall into the first recovery channel 207, and enter the coal mill 201 again for reprocessing and utilization.

[0036] Furthermore, the grinding assembly 200 also includes two primary fans 208 connected to the first channel 205 and providing wind to the first channel 205. An air preheater 209 is arranged behind one of the primary fans 208. The two primary fans 208 provide wind movement for the coal powder, and the primary hot air is blown out through the air preheater 209, and the primary cold air is mixed with the primary air to produce the primary air with suitable temperature and humidity. The coal powder separator 301 in the filter assembly 300 adopts a cyclone separator, which can separate the coarse powder from the fine powder. The coarse powder is recycled to the grinding assembly 200 for re-grinding, and the fine powder is stored in the intermediate bin 401.

[0037] Example 3

[0038] This embodiment is different from the previous embodiment in that Figure 3-4 As shown,

[0039] Since the powder supply assembly 500 generally uses wind power to supply coal powder, but the efficiency is difficult to maintain constant or difficult to adjust, a bin door opening and closing unit 403 is set below the intermediate bin 401, and the bin door opening and closing unit 403 includes a double-layer bottom plate arranged below the intermediate bin 401, and the double-layer bottom plate includes a first bottom plate 403a arranged on the upper layer and a second bottom plate 403b arranged on the lower layer, and a plurality of gap holes 403c are evenly opened on the first bottom plate 403a, and the distance between adjacent gap holes 403c is greater than or equal to the diameter of the gap hole 403c, and the positions of the gap holes 403c of the second bottom plate 403b and the first bottom plate 403a are exactly the same and are arranged in a close fit, and the second bottom plate 403b is slidably connected to the first bottom plate 403a. A slide rail 403a-1 is provided on the first base plate 403a, and a slide groove 403b-1 is correspondingly provided on the second base plate 403b to be clamped in the slide rail 403a-1. A spring 403a-2 is provided at one end of the slide rail 403a-1. The spring 403a-2 always drives the gap holes 403c on the second base plate 403b to correspond to the interval between the gap holes 403c on the first base plate 403a. The deformation length of the spring 403a-2 is a multiple of the diameter of the gap holes 403c. A rack 403b-2 is provided at the other end of the slide rail 403a-1 to push the second base plate 403b. The rack 403b-2 is meshed with a gear 403b-3, and the gear 403b-3 is sleeved on the rotating shaft of the driving motor 404.

[0040] Among them, the bin door opening and closing unit 403 can adjust the coal powder supply efficiency by cooperating with the gap holes 403c on the first bottom plate 403a and the second bottom plate 403b. When the gap holes 403c are staggered with each other under normal loading, the bin door opening and closing unit 403 is in a closed state and coal powder will not be supplied. When coal powder needs to be supplied, the driving motor 404 drives the gear 403b-3 to rotate, and the gear 403b-3 drives the rack 403b-2 to rotate, and the rack 403b-2 drives the second bottom plate 403b to slide relative to the first bottom plate 403a. The second bottom plate 403b compresses the spring 403a-2, and the gap holes 403c on the first bottom plate 403a and the second bottom plate 403b gradually intersect. The gap holes 403c at the intersection will supply coal powder to the combustion furnace 501. As the intersection position increases, the coal powder supply efficiency also increases. At the extreme position, the positions of the gap holes 403c overlap with each other to achieve maximum supply efficiency.

[0041] Furthermore, the combustion furnace 501 is provided with a detection unit 501a, which is electrically connected to the drive motor 404. The detection unit 501a controls the working time of the drive motor 404. The longer the driving motor 404 works, the higher the efficiency of the provided coal powder. The detection unit 501a detects the combustion efficiency of the combustion furnace 501. The powder supply component 500 includes a second channel 502 connected to the combustion chamber. A secondary fan 503 blowing toward the combustion furnace 501 is provided in the second channel 502. The secondary fan 503 continuously provides wind power to blow the coal powder falling from the intermediate bin 401 into the combustion furnace 501.

[0042] In this embodiment, the powder supply efficiency can be adjusted by setting the door opening and closing unit 403, and the adjustment is made according to the combustion efficiency required by the combustion furnace 501. The automatic control can maintain the stability of the overall system and save manpower and material resources.

[0043] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0044] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0045] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An automatic powder making system for a thermal power plant, characterized in that: include, A feed assembly (100) comprising an automatic coal transport unit (101); A grinding assembly (200), wherein a feed port of the grinding assembly (200) is connected to a discharge port of the automatic coal transport unit (101); The filtering assembly (300) comprises a coal powder separator (301), the discharge port of the grinding assembly (200) is connected to the feed port of the coal powder separator (301), and the coarse powder outlet of the coal powder separator (301) is connected to the grinding assembly (200); an intermediate storage assembly (400), comprising an intermediate bin (401) and a sensing element (402) disposed in the intermediate bin (401), the sensing element (402) being electrically connected to the automatic coal transport unit (101), and the intermediate bin (401) being connected to a fine powder outlet of the coal powder separator (301); and A powder supply assembly (500) is connected below the intermediate storage assembly (400), and a discharge port of the powder supply assembly (500) is connected to the combustion furnace (501); The grinding assembly (200) comprises a coal mill (201) and a grinding bowl (202) and a grinding roller (202a) arranged inside the grinding bowl (202); a screening disc (203) is arranged below the grinding bowl (202); a plurality of screening holes (203a) are arranged on the screening disc (203); the screening holes (203a) are connected to an inner channel (203c) arranged inside the screening disc (203); a corresponding scraper (204) is arranged above the screening disc (203) to rotate with the scraper; the inner channel (203c) is connected to a first channel (205); and the first channel (205) is connected to the coal powder separator (301); The screening disc (203) is in the shape of an arc with an opening facing upwards. A through hole (203b) is provided in the center of the screening disc (203). A coal block separation layer (206) is provided below the screening disc (203). A shaft (206a) is provided in the center of the coal block separation layer (206) and passes through the central through hole (203b) of the screening disc (203). The diameter of the shaft (206a) gradually increases from top to bottom. The diameter of the lower end of the shaft (206a) is equal to the diameter of the central through hole (203b) of the screening disc (203). The surface of the coal block separation layer (206) is inclined outward from the center. The lower end of the coal block separation layer (206) is connected to a first recovery channel (207). The first recovery channel (207) is connected to a feed inlet above the coal mill (201).

2. The automatic powder making system for thermal power plants according to claim 1, characterized in that: The grinding assembly (200) further comprises two primary fans (208) connected to the first channel (205) and providing wind force to the first channel (205), wherein an air preheater (209) is arranged behind one of the primary fans (208).

3. The automatic powder making system for thermal power plants according to claim 1, characterized in that: The automatic coal transport unit (101) comprises a conveyor belt (101a) arranged below the coal crusher, and a discharge port of the conveyor belt (101a) is arranged at an upper feed port of the coal mill (201).

4. The automatic powder making system for a thermal power plant according to any one of claims 1 or 3, characterized in that: The pulverized coal separator (301) is a cyclone separator.

5. The automatic powder making system for thermal power plants according to claim 4, characterized in that: The intermediate storage component (400) further comprises a door opening and closing unit (403) arranged below the intermediate warehouse (401), the door opening and closing unit (403) comprising a double-layer bottom plate arranged below the intermediate warehouse (401), the double-layer bottom plate comprising a first bottom plate (403a) arranged on the upper layer and a second bottom plate (403b) arranged on the lower layer, a plurality of gap holes (403c) being evenly arranged on the first bottom plate (403a), the distance between adjacent gap holes (403c) being greater than or equal to the diameter of the gap holes (403c), the positions of the gap holes (403c) of the second bottom plate (403b) and the first bottom plate (403a) being completely identical and being arranged in close contact, and the second bottom plate (403b) being slidably connected to the first bottom plate (403a).

6. The automatic powder making system for thermal power plants according to claim 5, characterized in that: The first bottom plate (403a) is provided with a slide rail (403a-1), the second bottom plate (403b) is correspondingly provided with a slide groove (403b-1) inserted into the slide rail (403a-1), a spring (403a-2) is provided at one end of the slide rail (403a-1), and the spring (403a-2) always drives the gap hole (403c) on the second bottom plate (403b) to correspond to the first bottom plate (403a). The spacing between the upper gap holes (403c) is such that the deformation length of the spring (403a-2) is in multiple relationship with the diameter of the gap hole (403c); a rack (403b-2) is provided at the other end of the slide rail (403a-1) to push the second bottom plate (403b); the rack (403b-2) is meshed with a gear (403b-3); and the gear (403b-3) is sleeved on the rotating shaft of the driving motor (404).

7. The automatic powder making system for thermal power plants according to claim 6, characterized in that: The combustion furnace (501) is provided with a detection unit (501a), and the detection unit (501a) is electrically connected to the driving motor (404).

8. The automatic powder making system for a thermal power plant according to any one of claims 1 or 7, characterized in that: The powder supply assembly (500) comprises a second channel (502) connected to the combustion furnace (501), and a secondary fan (503) blowing toward the combustion furnace (501) is arranged in the second channel (502).

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