Thermal power plant cross coal blending device with anti-blocking function and coal blending system
By introducing cross-coal blending devices and unblocking machines into the coal blending system of thermal power plants, and utilizing three-dimensional rotating scrapers and belt feeders, the problem of insufficient accuracy in traditional coal blending systems has been solved, achieving efficient and stable coal transportation and fuel utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU CR THERMOELECTRICITY CO LTD
- Filing Date
- 2025-03-25
- Publication Date
- 2026-04-14
AI Technical Summary
Traditional coal blending systems in thermal power plants lack precise allocation capabilities, resulting in insufficient operational efficiency and fuel economy.
The thermal power plant cross-coal blending device with anti-blocking function is adopted, including multiple coal feeders and unblocking machines. It uses a three-dimensional variable cross-section rotating scraper and a two-way slewing bearing design to achieve material unblocking and precise coal blending in the coal bunker. Combined with belt feeders and pneumatic gates, it ensures the continuity and stability of coal transportation.
It improves the accuracy of coal blending, enabling the use of more ultra-low calorie coal and an increase in the proportion of sludge blended in, thus meeting load dispatch requirements, reducing operating costs, and improving equipment efficiency.
Smart Images
Figure CN224118169U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal blending technology, and in particular to a cross-coal blending device and coal blending system for thermal power plants with anti-blocking function. Background Technology
[0002] In thermal power generating units, the coal blending method of the coal blending system is a key factor affecting the unit's operating efficiency and fuel economy. However, traditional coal blending systems are relatively crude and lack precise blending capabilities. Utility Model Content
[0003] The main purpose of this invention is to propose a cross-coal blending device and coal blending system for thermal power plants with anti-blocking function, aiming to improve the accuracy of coal blending.
[0004] To achieve the above objectives, the present invention proposes a cross-coal distribution device for thermal power plants with anti-blocking function, comprising several coal feeders, including a first coal feeder, a second coal feeder, a third coal feeder, and a fourth coal feeder.
[0005] The first coal feeder is located between the first coal bunker in a plurality of coal bunkers and the first coal mill in a plurality of coal mills, and is used to transport coal from the first coal bunker to the first coal mill.
[0006] The second coal feeder is located between the second coal bunker and the second coal mill, and is used to transport coal from the second coal bunker to the second coal mill.
[0007] The third coal feeder is located between the first coal bunker and the second coal mill, and is used to transport coal from the first coal bunker to the second coal mill.
[0008] The fourth coal feeder is located between the second coal bunker and the first coal mill, and is used to transport coal from the second coal bunker to the first coal mill.
[0009] In one embodiment, a first unblocking machine is provided at the coal drop outlet of the first coal bunker, and a second unblocking machine is provided at the coal drop outlet of the second coal bunker. The first unblocking machine and / or the second unblocking machine include an upper bunker body, a rotary assembly, and a lower bunker body. The upper bunker body, the rotary assembly, and the lower bunker body are connected in sequence. The coal drop outlet of the first coal bunker and / or the second coal bunker is connected to the upper bunker body, and the first coal feeder and / or the second coal feeder is connected to the lower bunker body.
[0010] In one embodiment, the rotary assembly includes a three-dimensional variable cross-section rotary scraper symmetrically arranged inside the unblocking machine. Driven by the rotary assembly, the symmetrically arranged three-dimensional variable cross-section rotary scraper rotates along the walls of the upper chamber and / or the lower chamber to remove the adhesive on the chamber walls.
[0011] In one embodiment, the three-dimensional variable cross-section rotary scraper is arranged longitudinally inside the unblocking machine.
[0012] In one embodiment, the rotary assembly further includes a bidirectional rotary bearing, the inner ring of which is connected to the rotating component of the rotary assembly. The three-dimensional variable cross-section rotary scraper is fixed to the outer ring of the bidirectional rotary bearing via a connector. When the inner ring of the bidirectional rotary bearing rotates with the rotating component of the rotary assembly, the outer ring of the bidirectional rotary bearing drives the three-dimensional variable cross-section rotary scraper to rotate along the wall of the upper chamber and / or the lower chamber to remove the adhesive on the chamber wall.
[0013] In one embodiment, the first unblocking machine and / or the second unblocking machine further includes a speed reducer and a motor. The speed reducer and the motor are disposed on one side of the rotary assembly and connected to the rotary assembly through a transmission mechanism. A transition section is provided between the rotary assembly and the upper chamber and between the rotary assembly and the lower chamber. The transition section is fixedly connected by a flange connection.
[0014] In one embodiment, the third and / or fourth coal feeders are belt feeders, and the inlet and / or outlet of the third and / or fourth coal feeders are provided with bidirectional pneumatic gate valves. The rotary assembly also includes a modified gate valve, which is located below the lower compartment so that the three-dimensional variable cross-section rotating scraper passes through the modified gate valve and reaches above the belt of the third and / or fourth coal feeders.
[0015] In one embodiment, the outlets of the first coal feeder and the fourth coal feeder are connected; and / or,
[0016] The outlets of the second and third coal feeders are connected.
[0017] In one embodiment, a first coal drop pipe is connected between the first coal bunker and the third coal feeder, and the first coal drop pipe is equipped with a first anti-blocking coal receiving device; and / or,
[0018] A second coal drop pipe is connected between the second coal bunker and the fourth coal feeder, and the second coal drop pipe is equipped with a second anti-blocking coal extraction device.
[0019] This utility model also proposes a cross-coal blending system for thermal power plants with anti-blocking function. The coal blending system includes several coal bunkers and several cross-coal blending devices for thermal power plants with anti-blocking function. The several coal bunkers include a first coal bunker and a second coal bunker. The first coal bunker stores a first type of coal, and the second coal bunker stores a second type of coal.
[0020] The technical solution of this utility model, by setting a third coal feeder between the first coal bunker and the second coal mill, and a fourth coal feeder between the second coal bunker and the first coal mill, can realize cross coal blending between the first coal bunker and the second coal mill, improve the accuracy of coal blending, and meet the needs of burning as much ultra-low calorie coal as possible and increasing the proportion of sludge blended. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0022] Figure 1 A front view structural schematic diagram of an embodiment of the cross-coal blending device for thermal power plants with anti-blocking function provided by this utility model;
[0023] Figure 2 A side view of an embodiment of the cross-coal blending device for thermal power plants with anti-blocking function provided by this utility model;
[0024] Figure 3 A side view of the unblocking machine in the cross-coal blending device for thermal power plants with anti-blocking function provided by this utility model;
[0025] Figure 4 A top view of the unblocking machine in the cross-coal blending device for thermal power plants with anti-blocking function provided by this utility model;
[0026] Figure 5 Another structural schematic diagram of the unblocking machine in the cross-coal blending device for thermal power plants with anti-blocking function provided by this utility model.
[0027] Explanation of icon numbers:
[0028]
[0029]
[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0034] In thermal power generating units, the coal blending method of the coal blending system is a key factor affecting the unit's operating efficiency and fuel economy. However, traditional coal blending systems are relatively crude and lack precise blending capabilities.
[0035] This utility model proposes a cross-coal blending device for thermal power plants with anti-blocking function.
[0036] Please see Figure 1In one embodiment of this utility model, the coal feeding device includes a first coal feeder 13, a second coal feeder 23, a third coal feeder 12, and a fourth coal feeder 22. The first coal feeder 13 is disposed between a first coal bunker 11 and a first coal mill, and is used to transport coal from the first coal bunker 11 to the first coal mill. The second coal feeder 23 is disposed between a second coal bunker 21 and a second coal mill, and is used to transport coal from the second coal bunker 21 to the second coal mill. The third coal feeder 12 is disposed between the first coal bunker 11 and the second coal mill, and is used to transport coal from the first coal bunker 11 to the second coal mill. The fourth coal feeder 22 is disposed between the second coal bunker 21 and the first coal mill, and is used to transport coal from the second coal bunker 21 to the first coal mill.
[0037] The technical solution of this utility model, by setting a third coal feeder 12 between the first coal bunker 11 and the second coal mill, and setting a fourth coal feeder 22 between the second coal bunker 21 and the first coal mill, can realize cross coal blending between the first coal bunker 11 and the second coal bunker 21, improve the accuracy of coal blending, and meet the needs of burning as much ultra-low calorie coal as possible and increasing the proportion of sludge blending.
[0038] In one implementation, such as Figure 2 As shown, Figure 2 This is a side view of an embodiment of the cross-coal blending device for thermal power plants with anti-blocking function provided by this utility model. A first anti-blocking machine (i.e., anti-blocking machine 15) is installed at the coal drop outlet of the first coal bunker 11, and a second anti-blocking machine is installed at the coal drop outlet of the second coal bunker 21. The first anti-blocking machine 15 and / or the second anti-blocking machine include an upper bunker body 2, a rotary assembly 3, and a lower bunker body 4. (Refer to...) Figure 3 , Figure 3 This utility model provides a side view of the unblocking machine in a cross-coal blending device for thermal power plants with anti-blocking function. The unblocking machine mainly adopts a modular design and consists of three parts: an upper chamber 2, a rotary assembly 3, and a lower chamber 4. The upper chamber, the rotary assembly, and the lower chamber are connected sequentially. The coal drop outlets of the first and / or second coal bunkers are connected to the upper chamber, and the first and / or second coal feeders are connected to the lower chamber.
[0039] In one embodiment, the rotary assembly 3 includes a three-dimensional variable cross-section rotary scraper 50, which is symmetrically arranged inside the unblocking machine 15. The symmetrically arranged three-dimensional variable cross-section rotary scraper 50 rotates along the walls of the upper chamber 2 and / or the lower chamber 4 under the drive of the rotary assembly 3 to remove the adhesive on the chamber walls.
[0040] Among them, reference Figure 4 , Figure 4This is a top view of the unblocking machine in the cross-coal blending device for thermal power plants with anti-blocking function provided by this utility model. Driven by the rotary assembly 3, the three-dimensional variable cross-section rotating scraper 50 built into the unblocking machine 15 rotates along the walls of the upper and / or lower bins. Material adhering to the walls of the upper and / or lower bins is completely and thoroughly detached from the bin walls under the forced action of the three-dimensional variable cross-section rotating scraper 50. Under the action of gravity, the material falls completely. The rotation of the three-dimensional variable cross-section rotating scraper 50 built into the unblocking machine 15 promotes the flow of material far from the center of the bin, increasing the flow velocity of raw materials far from the center of the coal bin. This changes the flow of raw materials in the bin from a central flow to a general flow, fundamentally eliminating the basis for coal stacking and arching at the top of the coal bin, preventing its formation. The built-in three-dimensional variable cross-section rotating scraper 50 can periodically clean the bin walls to prevent adhesion and blockage.
[0041] Optionally, the three-dimensional variable cross-section rotary scraper 50 may be centrally symmetrical, longitudinally symmetrical, or laterally symmetrical.
[0042] In one embodiment, refer to Figure 5 , Figure 5 This is another structural schematic diagram of the unblocking machine in the cross-coal blending device for thermal power plants with anti-clogging function provided by this utility model. The three-dimensional variable cross-section rotating scraper 50 is arranged longitudinally inside the unblocking machine. The built-in three-dimensional variable cross-section rotating scraper 50 includes a three-dimensional variable cross-section upper rotating scraper 51 and a three-dimensional variable cross-section lower rotating scraper 52. Because the scraper cross-section is small and arranged longitudinally, it will not cause secondary blockage of materials.
[0043] In one embodiment, the rotary assembly 3 further includes a bidirectional rotary bearing, the inner ring of which is connected to the rotating component of the rotary assembly 3. The three-dimensional variable cross-section rotary scraper 50 is fixed to the outer ring of the bidirectional rotary bearing by a connector. When the inner ring of the bidirectional rotary bearing rotates with the rotating component of the rotary assembly, the outer ring of the bidirectional rotary bearing drives the three-dimensional variable cross-section rotary scraper 50 to rotate along the walls of the upper chamber 2 and / or the lower chamber 4 to remove the adhesive on the chamber walls.
[0044] In one embodiment, the first unblocking machine and / or the second unblocking machine further includes a speed reducer and a motor. The speed reducer and the motor are disposed on one side of the rotary assembly 3 and connected to the rotary assembly 3 through a transmission mechanism. A transition section is provided between the rotary assembly 3 and the upper chamber 2, and between the rotary assembly 3 and the lower chamber 4. The transition section is fixedly connected by a flange connection.
[0045] In one embodiment, the third coal feeder 12 and / or the fourth coal feeder 22 are belt-type coal feeders, equipped with weighing and / or frequency conversion control functions. Belt-type coal feeders enable continuous and uniform coal supply, ensuring the stability of the combustion process. Furthermore, using highly reliable belt-type coal feeder equipment ensures accurate and reliable coal feeding. Additionally, the weighing function accurately measures the coal quantity, allowing for better control of fuel consumption and reduced operating costs. Frequency conversion control enables rapid adjustment of the coal feed rate according to system load demands, improving the system's load response capability.
[0046] In one embodiment, the inlet and / or outlet of the third coal feeder 12 and / or the fourth coal feeder 22 are equipped with bidirectional pneumatic gates, such as... Figure 2 As shown, a first bidirectional pneumatic gate 111 is provided at the inlet of the third coal feeder 12, a second bidirectional pneumatic gate 112 is provided at the outlet of the third coal feeder, a third bidirectional pneumatic gate 113 is provided at the inlet of the fourth coal feeder 22, and a fourth bidirectional pneumatic gate 114 is provided at the inlet of the fourth coal feeder.
[0047] For example, when coal in the first coal bunker 11 is transported to the second coal mill, the first bidirectional pneumatic slide gate 111 and the second bidirectional pneumatic slide gate 112 are opened, and the coal in the first coal bunker is transported to the second coal mill through the first bidirectional pneumatic slide gate 111, the third coal feeder 12, and the second bidirectional pneumatic slide gate 112.
[0048] For example, when the coal in the second coal bunker 21 is transported to the first coal mill, the third bidirectional pneumatic slide gate 113 and the fourth bidirectional pneumatic slide gate 114 are opened, and the coal in the second coal bunker is transported to the first coal mill through the third bidirectional pneumatic slide gate 113, the fourth coal feeder 22, and the fourth bidirectional pneumatic slide gate 114.
[0049] In one embodiment, the rotary assembly 3 further includes a modified gate valve 5, which is located below the lower chamber 4 so that the three-dimensional variable cross-section rotary scraper 50 passes through the modified gate valve 5 and reaches above the belt of the third feeder 12 and / or the fourth feeder 22.
[0050] Optionally, the cleaning height of the unblocking machine 15 can reach 2200 mm, providing a large coverage area and eliminating blind spots. Its scraper adopts a three-dimensional variable cross-section design, enabling 360-degree rotation with low resistance and no damage to the bin walls. Through the rotation and fixed-point start / stop of the three-dimensional variable cross-section rotating scraper 50, it can pass through the gate valve and reach directly above the coal feeder belt, effectively solving the coal blockage problems at the lower end and the connection between the gate valve and the coal feeder in traditional unblocking machines.
[0051] Furthermore, by incorporating anti-wear technology, zero wear is ensured between the three-dimensional variable cross-section rotating scraper 50 and the upper and lower chambers 2 and 4, resulting in smooth operation. In addition, the modular design prevents coal dust from contacting the drive mechanism, avoiding coal dust entering the rotating mechanism and reducing bearing wear. Simultaneously, maintenance is convenient and cost-effective, and the sealing flange is made of wear-resistant ductile iron, providing excellent sealing performance.
[0052] In addition, the unblocking machine 15 adopts a new type of soft and hard composite packing seal, which not only has a long sealing life, but also is easy to maintain and repair. It can be quickly replaced online without stopping the machine, and can be completed in a short time, which greatly improves the operating efficiency and maintenance convenience of the equipment.
[0053] In one embodiment, the outlets of the first coal feeder 13 and the fourth coal feeder 22 are connected; and / or, the outlets of the second coal feeder 23 and the third coal feeder 12 are connected. Thus, the first coal feeder 13 and the fourth coal feeder transport coal to the first coal mill through the same outlet, and the second coal feeder 23 and the third coal feeder 12 transport coal to the second coal mill through the same outlet. By connecting the outlets of two coal feeders to the same coal mill, different coal feeders can be flexibly switched or used simultaneously as needed, achieving precise proportioning of various coal types.
[0054] In one embodiment, a first coal drop pipe is connected between the first coal bunker 11 and the third coal feeder 12, and the first coal drop pipe is equipped with a first anti-blocking coal extraction device; and / or, a second coal drop pipe is connected between the second coal bunker 21 and the fourth coal feeder 22, and the second coal drop pipe is equipped with a second anti-blocking coal extraction device. The anti-blocking coal extraction device can effectively solve the common coal blockage problem in the coal drop pipe, ensuring that coal is smoothly transported from the coal bunker to the coal feeder, and guaranteeing the continuity and stability of coal supply.
[0055] Optionally, the slewing assembly 3 can be controlled by a PLC + frequency converter + touch screen intelligent control cabinet.
[0056] As another implementation method, the operation of the unblocking machine 15 can adopt three control modes: manual, automatic, and DCS (Distributed Control System). The coal blending device is equipped with frequency converter, PLC, touch screen, etc., which can realize human-machine dialogue. It can flexibly select continuous operation or interval timed operation mode according to actual needs, so as to minimize energy consumption and operating costs while ensuring efficient operation, thereby achieving a balance between high efficiency and low cost.
[0057] This application allows for rapid switching of coal types to meet the demands of rapid load response, the need for blending high- and low-calorific-value coals, and the reduction of fuel costs. Through precise cross-blending of the first and second coal bunkers, it can resolve the contradiction between load dispatch and the use of ultra-low-calorific-value coals, ensuring that it can meet both the load dispatch under the capacity pricing mechanism and the need to maximize the use of ultra-low-calorific-value coals and increase the proportion of sludge blending.
[0058] This utility model also proposes a cross-coal blending system for thermal power plants with anti-blocking function. The coal blending system includes several coal bunkers and several coal blending devices. The coal bunkers include a first coal bunker 11 and a second coal bunker 21. The first coal bunker 11 stores a first type of coal, and the second coal bunker 21 stores a second type of coal. The first type of coal in the first coal bunker 11 can be transported to the first coal mill through a first coal feeder 13; the second type of coal in the second coal bunker 21 can be transported to the second coal mill through a second coal feeder 23. When the coal blending device is under peak load, the high-quality coal in the first coal bunker 11 is transported to the second coal mill through an open first bidirectional pneumatic gate 111, a third coal feeder 12, and an open second bidirectional pneumatic gate 112. When the coal blending device is under non-peak load, the low-quality coal in the second coal bunker 21 is transported to the first coal mill through an open third bidirectional pneumatic gate 113, a fourth coal feeder 22, and an open fourth bidirectional pneumatic gate 114.
[0059] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A cross-coal blending device for thermal power plants with anti-blocking function, characterized in that, It includes several coal feeders, including a first coal feeder, a second coal feeder, a third coal feeder, and a fourth coal feeder; The first coal feeder is located between the first coal bunker in a plurality of coal bunkers and the first coal mill in a plurality of coal mills, and is used to transport coal from the first coal bunker to the first coal mill. The second coal feeder is located between the second coal bunker and the second coal mill, and is used to transport coal from the second coal bunker to the second coal mill. The third coal feeder is located between the first coal bunker and the second coal mill, and is used to transport coal from the first coal bunker to the second coal mill. The fourth coal feeder is located between the second coal bunker and the first coal mill, and is used to transport coal from the second coal bunker to the first coal mill.
2. The coal blending device as described in claim 1, characterized in that, A first unblocking machine is installed at the coal drop outlet of the first coal bunker, and a second unblocking machine is installed at the coal drop outlet of the second coal bunker. The first unblocking machine and / or the second unblocking machine include an upper bunker body, a rotary assembly, and a lower bunker body. The upper bunker body, the rotary assembly, and the lower bunker body are connected in sequence. The coal drop outlet of the first coal bunker and / or the second coal bunker is connected to the upper bunker body, and the first coal feeder and / or the second coal feeder is connected to the lower bunker body.
3. The coal blending device as described in claim 2, characterized in that, The rotary assembly includes a three-dimensional variable cross-section rotary scraper, which is symmetrically arranged inside the unblocking machine. Driven by the rotary assembly, the symmetrically arranged three-dimensional variable cross-section rotary scraper rotates along the walls of the upper chamber and / or the lower chamber to remove the adhesive on the chamber walls.
4. The coal blending device as described in claim 3, characterized in that, The three-dimensional variable cross-section rotary scraper is longitudinally arranged inside the unblocking machine.
5. The coal blending device as described in claim 3, characterized in that, The rotary assembly further includes a bidirectional rotary bearing, the inner ring of which is connected to the rotating component of the rotary assembly. The three-dimensional variable cross-section rotary scraper is fixed to the outer ring of the bidirectional rotary bearing via a connector. When the inner ring of the bidirectional rotary bearing rotates with the rotating component of the rotary assembly, the outer ring of the bidirectional rotary bearing drives the three-dimensional variable cross-section rotary scraper to rotate along the wall of the upper chamber and / or the lower chamber to remove the adhesive on the chamber wall.
6. The coal blending device as described in any one of claims 2 to 5, characterized in that, The first unblocking machine and / or the second unblocking machine further include a speed reducer and a motor. The speed reducer and the motor are located on one side of the rotary assembly and are connected to the rotary assembly through a transmission mechanism. A transition section is provided between the rotary assembly and the upper chamber and between the rotary assembly and the lower chamber. The transition section is fixedly connected by a flange connection.
7. The coal blending device as described in any one of claims 3 to 5, characterized in that, The third and / or fourth coal feeders are belt-type coal feeders. The inlet and / or outlet of the third and / or fourth coal feeders are equipped with bidirectional pneumatic gate valves. The rotary assembly also includes a modified gate valve, which is located below the lower compartment so that the three-dimensional variable cross-section rotating scraper passes through the modified gate valve and reaches above the belt of the third and / or fourth coal feeders.
8. The coal blending device as described in claim 1, characterized in that, The outlets of the first coal feeder and the fourth coal feeder are connected; and / or, The outlets of the second and third coal feeders are connected.
9. The coal blending device as described in claim 1, characterized in that, A first coal drop pipe is connected between the first coal bunker and the third coal feeder, and the first coal drop pipe is equipped with a first anti-blocking coal receiving device; and / or, A second coal drop pipe is connected between the second coal bunker and the fourth coal feeder, and the second coal drop pipe is equipped with a second anti-blocking coal extraction device.
10. A cross-coal blending system for thermal power plants with anti-blocking function, characterized in that, The coal blending system includes several coal bunkers and several cross-coal blending devices for thermal power plants with anti-blocking function as described in any one of claims 1 to 9. The several coal bunkers include a first coal bunker and a second coal bunker. The first coal bunker stores a first type of coal, and the second coal bunker stores a second type of coal.