System and method for rapidly adjusting load of coal-fired unit

Abstract

The invention relates to a system and a method for quickly adjusting the load of a coal-fired unit. The system for quickly adjusting the load of the coal-fired unit comprises a coal mill unit, a first-class coal mill and a second-class coal mill, the pulverized coal burner group comprises a first type of pulverized coal burners and a second type of pulverized coal burners, the first type of pulverized coal burners correspond to and are communicated with the first type of coal mills, the second type of pulverized coal burners correspond to and are communicated with the second type of coal mills, and a second type of pulverized coal pipeline is provided with an adjusting turn-off device; the position of the adjusting turn-off device on the second-class pulverized coal pipeline is adjustable; a powder-containing burner; and the pulverized coal classifier is connected to the second-class coal mill through a second-class pulverized coal pipeline so as to receive pulverized coal, and is connected to the pulverized coal-containing burner, the first-class pulverized coal burner and the second-class pulverized coal burner through the second-class pulverized coal pipeline so as to controllably convey the pulverized coal in a working state. In this way, the load of the coal-fired unit can be rapidly adjusted.

Description

Technical Field

[0001] The present invention relates to the field of energy technology, and in particular to a system and method for rapid load regulation of a coal-fired unit. Background Art

[0002] The country vigorously develops clean and renewable energy, reduces fossil energy consumption, and ensures that clean and renewable energy power is quickly connected to the grid and operates stably, while ensuring the safety and stability of the overall power grid. In this context, thermal power needs to undertake more and deeper peak-shaving tasks, and more and more thermal power units are participating in the peak-shaving of the power grid, practicing the transformation from the "cornerstone" of the stable operation of the power grid to "green and low-carbon" and "flexible assistance". The state explicitly requires the implementation of thermal power flexibility transformation, and has implemented the flexibility transformation of 220 million kilowatts of coal-fired units, so that the units have deep peak-shaving capabilities, increase the load response rate, and some units have the ability to quickly start and stop peak-shaving.

[0003] A coal-fired unit is a type of power generation equipment that uses coal as fuel. It generates heat energy by burning coal and then converts it into electrical energy. Coal-fired units are the most common type of thermal power plant. A pulverized coal conveyor is a device used to transport pulverized coal from one location to another. Pulverized coal is a fine powdery material produced during the crushing and grinding process of coal. It is often used in the fields of fuel supply for power plants and raw materials for industrial production.

[0004] In the process of participating in the peak load regulation operation, the coal-fired units of thermal power plants are faced with many problems such as the difficulty of quickly increasing the load of the units. According to the "two detailed rules" standards of the State Grid, on the one hand, the boiler is required to reduce the load, and on the other hand, it must be able to quickly rise to the rated load to achieve the goal of "peak load, trough load, and stable operation" of the unit load. However, the biggest obstacle to achieving "peak load" is that the thermal load of the unit cannot rise quickly, that is, the load cannot climb quickly, that is, the boiler load "cannot come up" in a very short time. The main reason is that the required pulverized coal cannot be supplied quickly. When the boiler load rises from 30% or less to 100% load, the stopped coal mill needs to be restarted, which takes a long time. The coal mill pulverizing speed cannot keep up, and the boiler does not have "enough" pulverized coal to burn, which directly affects the rapid rise of the unit load.

[0005] In addition, the coal powder conveyor uses a sprocket and chain drive to drive the coal powder forward during use. The coal powder dust easily adheres to the sprocket and chain surface, causing the coal powder dust to clump under the extrusion of the sprocket and chain. If it cannot be cleaned in time, it is easy to cause the sprocket and chain to slip, resulting in a decrease in the coal powder conveying efficiency, thereby affecting the rapid load climbing and adjustment of the coal-fired unit, resulting in a poor load response rate of the unit. For example, the coal powder conveyor disclosed in the authorization announcement number CN217229026U has a conveying component that can use a relatively closed space to avoid the falling of coal powder materials, thereby preventing environmental sanitation from being damaged and protecting the health of the staff in the area, but the coal powder dust easily adheres to the sprocket and chain surface, affecting the coal powder conveying efficiency.

[0006] Therefore, there is an urgent need for a system and method for rapid load regulation of coal-fired units to at least partially solve the problems existing in the current technology. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a system and method for rapid load regulation of a coal-fired unit.

[0008] According to a first aspect of the present invention, a system for rapid load regulation of a coal-fired unit is disclosed. The system for rapid load regulation of a coal-fired unit comprises: a coal mill unit, which is used to obtain coal powder to be burned in the boiler of the coal-fired unit and comprises a first type of coal mill and a second type of coal mill; a coal powder burner group, which is layered in the boiler and comprises a first type of coal powder burner and a second type of coal powder burner, wherein the first type of coal powder burner corresponds to the first type of coal mill and is connected via a first type of coal powder pipeline, the second type of coal powder burner corresponds to the second type of coal mill and is connected via a second type of coal powder pipeline, and the second type of coal powder pipeline is provided with a regulating shutoff device, which is turned off when the regulating shutoff device is in the boiler. The position of the second-class pulverized coal pipeline is adjustable; the pulverized coal burner is arranged in the boiler; and the pulverized coal classifier is connected to at least one of the second-class pulverized coal pipelines to receive pulverized coal, and is respectively connected to the pulverized coal burner, the first-class pulverized coal burner and the second-class pulverized coal burner via the second-class pulverized coal pipeline to controllably transport the pulverized coal to at least one of the following: the pulverized coal burner, one or more burners in the first-class pulverized coal burners and one or more burners in the second-class pulverized coal burners in a working state.

[0009] In some embodiments, the system for rapid load adjustment of coal-fired units may also include: a coal powder storage bin, connected to the coal powder classifier via at least one of the first type of coal powder pipeline or the second type of coal powder pipeline to receive coal powder from the coal powder classifier, and connected to the first type of coal powder burner and the second type of coal powder burner via the second type of coal powder pipeline.

[0010] In some embodiments, the system for rapid load regulation of coal-fired units may further include: a pulverized coal conveyor disposed between the pulverized coal storage bin and the coal pulverizing unit and adapted to convey pulverized coal from the pulverized coal storage bin to the pulverized coal burner group.

[0011] In some embodiments, the coal powder conveyor may include: a shell and a cleaning mechanism arranged inside the shell, which is used to clean the coal ash adhered to the coal powder conveying element, and also includes a transmission mechanism arranged on one side of the shell, which is used to drive the coal powder conveyor to convey the coal powder, the cleaning mechanism includes an arc knife and a scraper, a reciprocating screw rod is arranged in the middle position of the shell, a driving block is arranged on the outside of the reciprocating screw rod, a double-axis electric push rod is arranged at one end of the driving block, and a rubber seat is arranged at the extended end of the double-axis electric push rod, and the arc knife is screwed into the shell. The bolt is fixed to one end of the rubber seat, the scraper is installed under the driving block, the transmission mechanism includes a toothed pulley A, a driving motor A is provided at one end of the shell, a driving roller is provided at the rotating end of the driving motor A, the toothed pulley A is fixed to one end of the driving roller by bolts, a toothed belt A is provided on the outer side of the toothed pulley A, a driven roller is provided at one end of the toothed belt A, a toothed pulley B is provided at one end of the driven roller, a toothed belt B is provided on the outer side of the toothed pulley B, and one end of the toothed belt B is connected to the reciprocating screw transmission.

[0012] In some embodiments, an adding mechanism is provided above the shell for adding coal powder to be transported, and the adding mechanism includes an adding bucket, which is welded to the top of the shell. A round rod is provided on the inner wall of the adding bucket, and a driving motor B is provided at one end of the round rod. A spiral blade is provided at the rotating end of the driving motor B.

[0013] In some embodiments, a protective shell is disposed on the outer side of the driving motor B, and a dome is disposed on the top of the protective shell.

[0014] In some embodiments, a plurality of material baffle inclined plates are disposed at the bottom of the shell, and a material unloading baffle is disposed at the outer side of the shell.

[0015] In some embodiments, telescopic protective covers are provided at both ends of the driving block, and a sliding rod is provided at the top of the driving block.

[0016] In some embodiments, a box body is disposed below the driving block, a lifting block is disposed on the inner wall of the box body, an arc-shaped leaf spring is disposed inside the box body, and the lifting blocks are fixedly connected to each other.

[0017] In some embodiments, a conveyor belt is disposed on the outer sides of the driving roller and the driven roller, and a plurality of paddles are disposed on the outer sides of the conveyor belt.

[0018] According to the second aspect of the present invention, a method for rapid load regulation of a coal-fired unit is provided. The method for rapid load regulation of a coal-fired unit adopts the system according to the first aspect of the present invention. The method comprises: when the boiler is running at a low load, a second type of coal mill is put into operation, and the second type of coal mill is operated at a high output, a part of the ground coal powder is input into the second type of coal powder burner in the boiler through a coal powder pipeline, and the other part of the coal powder enters the coal powder separator; the coal powder pipeline at the outlet of the second type of coal mill is respectively arranged with an adjusting shut-off device, and the amount of coal powder is adjusted and controlled by the corresponding adjusting shut-off device; the spare coal powder passing through the coal powder separator enters the coal powder storage bin in one way, and the other way carries a trace amount of powder-containing air through a pipeline into the powder-containing burner and is sent to the boiler furnace for combustion, and the delivery amount of the trace amount of powder-containing air is controlled by the corresponding adjusting shut-off device; when coal is required to be burned, the amount of powder-containing air is controlled by the corresponding adjusting shut-off device; the amount of powder-containing air is controlled by the corresponding adjusting shut-off device; when coal is required to be burned, ... When the unit rapidly climbs from low load to high load, the spare pulverized coal that has been ground in the pulverized coal storage bin is immediately and quickly put into use, and sent to the inlet of the first type of pulverized coal burner through the pulverized coal conveyor, and the pulverized coal is sent to the boiler for combustion, and the amount of pulverized coal entering is adjusted by the corresponding regulating shut-off device; after the coal mill unit is fully operational, the corresponding regulating shut-off device is shut off, and the conveyance of spare pulverized coal to the second type of pulverized coal burner is stopped, so as to achieve the goal of instantaneous pulverized coal delivery when the boiler rapidly increases its load; when the unit is operating normally at high load, the pulverized coal at the outlet of the boiler coal mill unit is directly sent to the burner group through the pulverized coal pipeline and sent into the furnace for combustion, the regulating shut-off devices are all closed, and the pulverized coal burners are shut down.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] The embodiment of the present invention can keep the running coal mill running at high or maximum output when the boiler is running at low load, and store the excess qualified coal powder in an independent coal powder storage bin as a spare coal powder source. When the unit is "rapidly climbing" from low load to high load, the spare coal powder is immediately and instantly put into use, and is directly sent to the coal powder pipeline at the burner inlet through the coal powder conveyor, and sent to the furnace for combustion. After the coal mill is "fully started" and running at full output, the transportation of the spare coal powder is immediately shut off, so as to realize "instantaneous" coal powder delivery when the boiler is rapidly loaded, and avoid the problem of slow load climbing caused by the restart of the coal mill and the inability of the coal powder making speed to keep up, so as to realize the "keeping up" of the coal powder making speed and "instantaneous" coal powder delivery when the boiler is rapidly loaded.

[0021] The embodiments of the present invention can ensure that the boiler can quickly climb from low load to high load or full load, and solve the problem that the boiler load is difficult to increase quickly and cannot meet the "peak" demand of the power grid load due to the long time taken to restart the coal mill in the traditional way. The boiler can respond to the load changes of the power grid in time and better adapt to the requirements of the peak operation of the power grid.

[0022] The embodiment of the present invention shortens the transition time of boiler load from low to high by storing spare coal powder in advance, improves the boiler load response rate, enhances the flexibility and adaptability of the boiler in power grid peak regulation, and helps to improve the stability and reliability of the entire power grid. At the same time, by controlling the regulating and shutting device, not only can the rapid increase of the load of the coal-fired unit be achieved, but also the decrease rate of the load of the coal-fired unit can be effectively controlled.

[0023] This system does not affect the normal operation of the unit at high load, and can quickly and smoothly switch the powder supply mode during the process of rising from low load to high load, avoiding problems such as unstable boiler combustion and reduced efficiency caused by rapid load changes, ensuring that the boiler can operate efficiently, safely, stably and environmentally friendly for a long time, extending the service life of the boiler and reducing operation and maintenance costs.

[0024] The coal-fired conveyor provided by the present invention drives the driven roller and the reciprocating screw to rotate in linkage through the driving motor A under the transmission action of the toothed pulley B and the toothed belt B. The driving motor A drives the reciprocating screw to drive the scraper to scrape the coal ash adhered to the conveyor belt. The arc knife cleans the coal ash adhered to the outer side of the driving roller and the driven roller in time to prevent the coal dust from adhering to the sprocket and the chain surface, and prevents the sprocket and the chain from slipping, thereby ensuring the conveying efficiency of the coal-fired conveyor, thereby providing support for rapid load adjustment. The coal-fired conveyor provided by the present invention can also drive the spiral blade to rotate along the adding bucket through the driving motor B, thereby preventing the coal-fired adding process from being blocked while ensuring the coal-fired material discharge pressure, further improving the conveying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] These and other objects, features and advantages will become apparent when the following detailed description of exemplary embodiments is read in conjunction with the accompanying drawings, in which:

[0026] Figure 1 The system layout diagram of the coal-fired unit in the prior art is shown;

[0027] Figure 2 A schematic diagram of a system for rapid load regulation of a coal-fired unit according to an embodiment of the present invention is shown;

[0028] Figure 3 A schematic diagram of a system for rapid load regulation of a coal-fired unit according to another embodiment of the present invention is shown;

[0029] Figure 4 It shows a schematic diagram of a main view structure provided according to an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a rear view structure provided according to an embodiment of the present invention is shown;

[0031] Figure 6 A schematic diagram of an assembly structure provided according to an embodiment of the present invention is shown;

[0032] Figure 7 A schematic diagram of a local structure provided in an embodiment of the present invention is shown;

[0033] Figure 8 The embodiment provided according to the present invention shows Figure 4 Schematic diagram of the cross-section structure;

[0034] Fig. 9 The embodiment provided according to the present invention shows Figure 8 Schematic diagram of the local enlarged structure at point A in the middle.

[0035] Description of reference numerals:

[0036] 100, housing; 200, material blocking inclined plate; 300, material unloading baffle; 400, conveyor belt; 500, dial plate;

[0037] 101, reciprocating screw rod; 102, driving block; 103, double-axis electric push rod; 104, rubber seat; 105, arc knife; 106, scraper; 110, telescopic protective cover; 120, sliding rod; 130, box body; 140, lifting block; 150, arc leaf spring;

[0038] 201, driving motor A; 202, driving roller; 203, toothed pulley A; 204, toothed belt A; 205, driven roller; 206, toothed pulley B; 207, toothed belt B;

[0039] 301. Adding bucket; 302. Round rod; 303. Driving motor B; 304. Spiral blade; 310. Protective shell; 320. Dome. DETAILED DESCRIPTION

[0040] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0041] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature. In this context, pulverized coal burner and burner express the same or similar content.

[0042] As mentioned above, it is difficult for coal-fired units to achieve "peak load, trough load and stable operation". The main problem is that the thermal load of the unit cannot rise quickly, that is, the load climbing speed is slow. When the boiler rises from low load to rated load, it takes time to restart the shut-down coal mill, and the pulverizing speed cannot keep up, resulting in insufficient coal powder to burn in the boiler, affecting the rapid load climbing.

[0043] The present invention creatively proposes to increase the output of the coal mill in operation during low-load operation, and store the excess qualified coal powder in an independent coal powder storage bin as a backup. When the load is rapidly increased from low to high, the spare coal powder in the storage bin is instantly put into use so that the pulverizing speed can keep up in time, and the spare coal powder is directly sent to the furnace for combustion, so as to achieve instantaneous powder delivery when the boiler is rapidly increased in load, and the input heat increases rapidly to meet the "peak" demand of the load. The exemplary embodiment of the present invention ensures the normal output of the coal mill during low-load operation, and the excess coal powder is stored in an independent coal powder storage bin. The spare coal powder source carries a trace amount of powder-containing air through pipelines and newly added powder-containing air burners and is sent into the furnace for combustion. When operating at full load, the supply of powder-containing air and the operation of the burner are stopped. Passages are installed on the coal powder pipeline at the coal mill outlet and the burner inlet pipeline to achieve multi-path transportation and regulation of coal powder. When operating at high load, the pulverized coal enters the burner directly through the pipeline for combustion; when rapidly climbing from low load to high load, the spare pulverized coal in the storage bin is instantly put into use, and the spare pulverized coal export system is shut down after the pulverizer is running at full output to achieve the goal of rapid load increase, so that the unit can lower the load to the bottom and rise to the peak, thereby improving the load response rate of the unit.

[0044] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] Figure 1 The system layout diagram of coal-fired units in the current technology is shown. Figure 1As shown, the coal-fired unit includes a connection layout of multiple coal mills and boilers, wherein multiple pulverized coal burners are arranged in the boiler, and the multiple pulverized coal burners can be arranged in layers so that the pulverized coal is evenly burned in the boiler. Multiple coal mills can form a coal mill unit, and multiple pulverized coal burners (marked as A layer burner to F layer burner) form a pulverized coal burner group. It should be understood that although Figure 1 Six coal mills (labeled as coal mill A to coal mill F) and six layers of pulverized coal burners are shown in FIG. 1 , but this is merely exemplary, and the coal-fired unit can also be configured with other suitable numbers of coal mills and pulverized coal burners. Figure 1 In the process, each coal mill is connected to the pulverized coal burner in the boiler through an independent pulverized coal pipeline to ensure that the pulverized coal can be effectively transported to the boiler for combustion. It should be understood that each burner in the A-F layer burner can be a single burner or a general term for multiple sub-burners.

[0046] In such coal-fired units, some units need to be shut down at low loads, and when they need to climb back to high loads or even full loads, the shut-down coal mills and burners take a long time to restart. When the load needs to be adjusted quickly, multiple burners may be difficult to adjust synchronously, resulting in slow response and affecting the peak-shaving capacity of the unit. Moreover, such units are not equipped with efficient coal powder conveyors. If the coal powder pipeline is not designed properly or is aged, it may lead to coal powder loss during the transportation process, reducing the transportation efficiency and further affecting the rapid adjustment of the unit load.

[0047] In one embodiment, taking six coal mills (A / B / C / D / E / F) as an example, when the boiler is running at full load, five or six coal mills are usually required to run simultaneously to meet the coal consumption of the boiler. However, after the low-load flexibility modification, when the boiler is running at 30% load or below, generally only two or three coal mills need to be run. This design allows for lower energy consumption and less equipment wear at low loads.

[0048] However, this design has obvious disadvantages when the boiler needs to quickly increase from 30% load or less to 100% load. The main problem is that the coal consumption required for 100% load cannot be met by the coal grinding capacity of only 2 or 3 coal mills in operation. In order to meet the demand for full load operation, other coal mills that have stopped operating must be started. This process takes a long time because the coal quantity and operating parameters of the coal mills need to be gradually increased to reach normal operation, which makes it impossible to meet the requirements of immediate and rapid load increase. In addition, the system transports coal powder through coal powder pipelines, and the transportation efficiency cannot be guaranteed.

[0049] Reference Figure 2 and Figure 3The coal-fired unit load rapid regulation system of the present invention integrally includes a coal mill unit, a pulverized coal burner group, a pulverized coal burner, a pulverized coal classifier, a pulverized coal storage bin and a pulverized coal conveyor, and each component is connected by a pulverized coal pipeline for conveying pulverized coal. Among them, the coal mill unit is composed of a first-class coal mill and a second-class coal mill, which are responsible for producing pulverized coal suitable for boiler combustion. The pulverized coal burner group can be arranged in layers in the boiler, including a first-class pulverized coal burner connected to the first-class coal mill, and a second-class pulverized coal burner connected to the second-class coal mill. Specifically, the first-class coal mill corresponds to the first-class pulverized coal burner one-to-one, and is connected by a first-class pulverized coal pipeline. This first-class pulverized coal pipeline can be as follows Figure 1 The pulverized coal pipeline shown may also be any other suitable pulverized coal pipeline in the art, and the present invention is not limited to this.

[0050] Further, the second type of coal mill corresponds to the second type of coal powder burner one by one and is connected through the second type of coal powder pipeline. The second type of coal powder pipeline can be a coal powder pipeline with an adjustment shut-off device installed thereon, allowing accurate control of the coal powder flow rate, including shut-off operation, opening operation and flow control operation. In addition, the pipeline part of the second type of coal powder pipeline can be connected to Figure 1 The same pipeline as the pulverized coal pipeline shown may also be any other suitable pulverized coal pipeline in the art, and the present invention is not limited to this.

[0051] In one embodiment, the pulverized coal burner can be directly installed inside the boiler for directly burning pulverized coal under specific working conditions. The pulverized coal classifier is connected to the second type of coal mill, and the pulverized coal is transported to the pulverized coal burner, the first type of coal pulverized burner and the second type of coal pulverized burner through the second type of coal pulverized pipeline to achieve controlled distribution of pulverized coal. That is, the pulverized coal classifier can be used as a branch to receive part of the pulverized coal from the first type of coal mill for storage and standby. When operating at low load, the system can reduce the number of coal mills in operation, and when the load needs to be increased quickly, the pulverized coal can be quickly replenished through the pulverized coal storage bin, which is connected to the pulverized coal classifier through the first type of coal pulverized pipeline or the second type of coal pulverized pipeline, and is further connected to the pulverized coal burner group.

[0052] In one embodiment, the position of the regulating and shutting device on the second type of pulverized coal pipeline is adjustable. For example, the regulating and shutting device on the second type of pulverized coal pipeline connecting the second type of coal mill and the second type of pulverized coal burner can be arranged in parallel with the regulating and shutting device on the second type of coal mill and the pulverized coal classifier, thereby forming a "tee" to achieve precise regulation of pulverized coal transportation. In other embodiments, the regulating and shutting device can also be arranged at any other suitable position, as long as it can achieve the corresponding technical effect, and the present invention is not limited to this.

[0053] In one embodiment, a pulverized coal conveyor is disposed between the pulverized coal storage bin and the coal pulverizing unit, acting as a bridge to ensure that the pulverized coal can be efficiently transported from the storage bin to the burner group. The pulverized coal conveyor may be connected to the pulverized coal storage bin via a first type of pulverized coal pipeline, or may be connected to the pulverized coal storage bin via a second type of pulverized coal pipeline, and the present invention does not limit this. In a preferred embodiment, the pulverized coal conveyor is connected to the pulverized coal burner group via a second type of pulverized coal pipeline, and it may be directly connected to each burner of the pulverized coal burner group, or it may be connected to the pulverized coal pipeline corresponding to the pulverized coal burner group and the coal pulverizing unit, and the present invention does not limit this either. This optimizes its efficiency in delivering pulverized coal, enabling it to better adapt to the needs of rapid load adjustment of coal-fired units, which will be discussed below in conjunction with Figures 4 to 9 The specific implementation of the pulverized coal conveyor is introduced in more detail.

[0054] Combined with the following Figure 2 and Figure 3 Specific embodiments of the present invention are described. Figure 2 A schematic diagram of a system for rapid load regulation of a coal-fired unit according to an embodiment of the present invention is shown, and Figure 3 A schematic diagram of a system for rapid load regulation of a coal-fired unit according to another embodiment of the present invention is shown.

[0055] like Figure 2 As shown, after the boiler is modified for low load flexibility, two mills are operated at a load of 30% or less. Figure 2 It is assumed that the A / B coal mills (second-type coal mills, corresponding to the second-type pulverized coal burners, i.e., A / B layer burners) need to be shut down. It can also be any other two coal mills, C / D / E / F coal mills (first-type coal mills, corresponding to the first-type pulverized coal burners, i.e., C / D / E / F layer burners) need to be shut down. Figure 2As shown, when the coal-fired unit is under low load, only the A / B coal mill is put into operation, and the amount of coal burned is reduced under low load. Originally, the A / B coal mill does not need to be operated at maximum output. However, the embodiment of the present invention can still make the A / B coal mill operate at maximum output under low load, and the excess qualified coal powder is directly stored in the independent coal powder storage bin as a spare coal powder source for "quick powder feeding" under the premise of ensuring the amount of coal powder required for the low load operation of the boiler. That is, a tee can be installed on the coal powder pipelines at the outlets of the A coal mill and the B coal mill, respectively, and a part of the qualified coal powder is input into the boiler through the coal powder pipeline, and a part of the coal powder enters the coal powder separator, and each outlet is respectively arranged with a first regulating and shutting device 1, a second regulating and shutting device 2, a third regulating and shutting device 3, and a fourth regulating and shutting device 4, and the amount of coal powder entering each branch is regulated and controlled by the first regulating and shutting device 1, the second regulating and shutting device 2, the third regulating and shutting device 3, and the fourth regulating and shutting device 4. The spare pulverized coal passes through the pulverized coal classifier and enters the independent pulverized coal storage bin, along with a trace amount of pulverized air, and enters the newly added pulverized burner through the pipeline to be sent into the furnace for combustion. The delivery amount of the trace amount of pulverized air is controlled by the fifth regulating and shutting device 5. Once the unit is required to "rapidly climb" from low load to high load, the spare pulverized coal that has been ground in the pulverized coal storage bin is immediately and quickly put into use, and sent directly to the burner inlet through the pulverized coal conveyor and the pulverized coal pipeline tee to the pulverized coal burner for combustion in the furnace. The amount of pulverized coal entering the furnace is adjusted by the sixth regulating and shutting device 6, the seventh regulating and shutting device 7, the eighth regulating and shutting device 8, the ninth regulating and shutting device 9, the tenth regulating and shutting device 10, and the eleventh regulating and shutting device 11. After the coal mill is "fully started" and running at full output, the sixth regulating and shutting device 6, the seventh regulating and shutting device 7, the eighth regulating and shutting device 8, the ninth regulating and shutting device 9, the tenth regulating and shutting device 10, and the eleventh regulating and shutting device 11 are immediately shut off to stop the transportation of spare pulverized coal, thereby completing the goal of "instantaneous" pulverized coal delivery when the boiler quickly increases its load. This system does not affect the normal operation of the unit at high load. When the unit is operating normally at high load, the pulverized coal at the boiler pulverizer outlet is directly sent into the furnace for combustion through the pulverized coal pipeline into the burner. The first regulating and shut-off device 1 and the third regulating and shut-off device 3 are opened, and the second regulating and shut-off device 2, the fourth regulating and shut-off device 4, the fifth regulating and shut-off device 5, the sixth regulating and shut-off device 6, the seventh regulating and shut-off device 7, the eighth regulating and shut-off device 8, the ninth regulating and shut-off device 9, the tenth regulating and shut-off device 10, and the eleventh regulating and shut-off device 11 are all closed, and the newly added pulverized burner is shut down.

[0056] like Figure 3 As shown in the figure, after the boiler is modified for low load flexibility, three mills are operated at a load of 30% or less. Figure 3Assume that A / B / C coal mills (second-type coal mills, corresponding to second-type pulverized coal burners, i.e. A / B / C layer burners), or any other three coal mills, D / E / F coal mills (first-type coal mills, corresponding to first-type pulverized coal burners, i.e. D / E / F layer burners) need to be shut down. Figure 3As shown, only the A / B / C coal mills are put into operation at low load, and the amount of coal burned at low load is reduced. Originally, the A / B / C coal mills do not need to be operated at maximum output. The present invention allows the A / B / C coal mills to operate at maximum output at low load. Under the premise of ensuring the amount of coal powder required for the low-load operation of the boiler, the excess qualified coal powder is directly stored in an independent coal powder storage bin as a backup coal powder source for "quick pulverization". That is, a tee is installed on the coal powder pipeline at the outlet of the coal mill A / B / C, part of the qualified coal powder is fed into the boiler through the coal powder pipeline, and part of the coal powder enters the coal powder separator, and each outlet is respectively arranged with a first regulating and shutting device 1, a second regulating and shutting device 2, a third regulating and shutting device 3, a fourth regulating and shutting device 4, a fifth regulating and shutting device 5, and a sixth regulating and shutting device 6, and the amount of coal powder entering each branch is regulated and controlled by the first regulating and shutting device 1, the second regulating and shutting device 2, the third regulating and shutting device 3, the fourth regulating and shutting device 4, the fifth regulating and shutting device 5, and the sixth regulating and shutting device 6. The spare coal powder passing through the coal powder separator enters the independent coal powder storage bin, and enters the newly added coal powder burner through the pipeline with a trace amount of powder-containing air to be sent to the furnace for combustion, and the delivery amount of the trace amount of powder-containing air is controlled by the seventh regulating and shutting device 7. Once the unit is required to "rapidly climb" from low load to high load, the spare pulverized coal that has been ground in the pulverized coal storage bin is immediately and quickly put into use, and is directly sent to the burner inlet through the pulverized coal conveyor and the pulverized coal pipeline tee to the pulverized coal burner for combustion in the furnace. The amount of pulverized coal entering the furnace is adjusted by the eighth regulating and shutting device 8, the ninth regulating and shutting device 9, the tenth regulating and shutting device 10, the eleventh regulating and shutting device 11, the twelfth regulating and shutting device 12, and the thirteenth regulating and shutting device 13. After the coal mill is "fully started" and running at full output, the eighth regulating and shutting device 8, the ninth regulating and shutting device 9, the tenth regulating and shutting device 10, the eleventh regulating and shutting device 11, the twelfth regulating and shutting device 12, and the thirteenth regulating and shutting device 13 are immediately shut off to stop the transportation of spare pulverized coal and achieve the goal of "instantaneous" pulverized coal delivery when the boiler quickly increases its load. This system does not affect the normal operation of the unit at high load. When the unit is operating normally at high load, the pulverized coal at the boiler pulverizer outlet is directly sent into the burner through the pulverized coal pipeline and into the furnace for combustion. The first regulating and shut-off device 1, the third regulating and shut-off device 3, and the fifth regulating and shut-off device 5 are turned on, and the second regulating and shut-off device 2, the fourth regulating and shut-off device 4, the sixth regulating and shut-off device 6, the seventh regulating and shut-off device 7, the eighth regulating and shut-off device 8, the ninth regulating and shut-off device 9, the tenth regulating and shut-off device 10, the eleventh regulating and shut-off device 11, the twelfth regulating and shut-off device 12, and the thirteenth regulating and shut-off device 13 are all closed, and the newly added burner containing pulverized coal is shut down.

[0057] In this way, the coal-fired unit will still ensure the normal output of the running coal mill when the boiler is running at low load. On the premise of ensuring the amount of coal powder required for the low-load operation of the boiler, the excess qualified coal powder ground by the running coal mill will be directly stored in the independent coal powder storage bin as a standby coal powder source for "quick powder feeding". The trace amount of powder-containing air carried by the standby coal powder source is sent to the furnace for combustion through pipelines and newly added powder-containing air burners. When the boiler is running at full load, the trace amount of powder-containing air carried by the standby coal powder source will stop being supplied and the powder-containing air burner will stop running.

[0058] A "three-way" is designed and installed on the coal pulverizer outlet coal pipeline and the burner inlet pipeline, that is, the coal pulverizer outlet coal pipeline is changed from "one to two", one way is directly sent to the furnace through the burner for combustion; one way enters the coal pulverizer classifier and then enters the independent coal pulverizer storage bin, and one way enters the pipeline through the newly added coal pulverizer burner to be sent to the furnace for combustion. The coal pulverizer inlet pipeline of the burner is changed from "two to one", and the regulating and shut-off devices are set on the coal pulverizer pipeline to control the coal pulverizers from different "sources" to enter the burner for spraying and burning in the furnace. When the unit is operating normally at high load, the pulverized coal at the outlet of the boiler pulverizer is directly sent to the burners on each layer through the pulverized coal pipeline and sent to the furnace for combustion. When the unit "rapidly climbs" from low load to high load, the spare pulverized coal that has been ground in the pulverized coal storage bin is immediately and quickly put into use. It is directly sent into the pulverized coal pipeline through the pulverized coal conveyor and sent to the pulverized coal burners on each layer for combustion in the furnace. After the pulverizer is "fully started" and running at full output, the spare pulverized coal outlet system on the burner inlet pipeline is immediately shut down, thus achieving the goal of "instantaneous" pulverized coal delivery and rapid increase in boiler input heat when the boiler load is rapidly increased.

[0059] In order to further improve the speed of "instantaneous" powder feeding and rapid increase of boiler input heat when the boiler is rapidly loaded, such as Figure 4 , Figures 5 to 9As shown, a coal powder conveyor is provided.The pulverized coal conveyor includes a shell 100 and a cleaning mechanism arranged inside the shell 100, which is used to clean the coal ash adhered to the pulverized coal conveying element. It also includes a transmission mechanism arranged on one side of the shell 100, which is used to drive the pulverized coal conveyor to convey the pulverized coal. The cleaning mechanism includes an arc knife 105 and a scraper 106. A reciprocating screw rod 101 is rotatably connected to the middle position of the shell 100, and a driving block 102 is transmission-connected to the outer side of the reciprocating screw rod 101. The reciprocating screw rod 101 drives the driving block 102 to move back and forth, thereby driving the arc knife 105 and the scraper 106 to move back and forth, and scraping the pulverized coal adhered to the conveyor belt 400, the driving roller 202 and the driven roller 205. The two ends of the driving block 102 are fixed with telescopic protective covers 110 by bolts. The telescopic protective cover 110 prevents coal powder from entering between the reciprocating screw rod 101 and the driving block 102. The top of the driving block 102 is slidably connected with a sliding rod 120. One end of the driving block 102 is fixed with a double-axis electric push rod 103 by bolts. The extended end of the double-axis electric push rod 103 is fixed with a rubber seat 104 by bolts. The arc knife 105 is fixed to one end of the rubber seat 104 by bolts. The double-axis electric push rod 103 drives the arc knife 105 to be close to the outer surface of the driving roller 202 and the driven roller 205. The scraper 106 is installed below the driving block 102. The bottom of the shell 100 is fixed with a plurality of material blocking inclined plates 200 by bolts. The outer side of the shell 100 is slidably connected with a material discharge baffle 300. The material blocking inclined plate 200 gathers the scraped coal powder. The plate 300 is led out from the coal powder conveyor, a box body 130 is welded below the driving block 102, a lifting block 140 is slidably connected to the inner wall of the box body 130, an arc leaf spring 150 is fixed inside the box body 130 by bolts, the arc leaf spring 150 elastically presses the scraper 106 to ensure the tightness of the scraper 106 and the conveyor belt 400, the lifting block 140 is fixedly connected to the lifting block 140, the transmission mechanism includes a toothed pulley A203, a driving motor A201 is fixed to one end of the housing 100 by bolts, a driving roller 202 is fixed to the rotating end of the driving motor A201 by bolts, the toothed pulley A203 is fixed to one end of the driving roller 202 by bolts, the outer side of the toothed pulley A203 is connected to the toothed belt A204, and the toothed belt A One end of 204 is transmission-connected with a driven roller 205, and a driving motor A201 drives a toothed pulley A203 to rotate through the driving roller 202, and drives multiple driven rollers 205 to rotate synchronously under the transmission action of the toothed belt A204, and the outer sides of the driving roller 202 and the driven roller 205 are rotationally connected with a conveyor belt 400, and multiple shifting plates 500 are fixed to the outer side of the conveyor belt 400 by bolts, and one end of the driven roller 205 is fixed with a toothed pulley B206 by bolts, and the outer side of the toothed pulley B206 is transmission-connected with a toothed belt B207, and one end of the toothed belt B207 is transmission-connected with the reciprocating screw 101, and the driven roller 205 and the reciprocating screw 101 are driven to form a linkage under the transmission action of the toothed pulley B206 and the toothed belt B207.

[0060] In this embodiment, the operator starts the drive motor A201, and the drive motor A201 drives the driven roller 205 and the reciprocating screw 101 to rotate in conjunction under the transmission action of the toothed pulley B206 and the toothed belt B207. No external power source is required, which reduces the complexity of the coal powder conveying and cleaning mechanism. The drive motor A201 drives the conveyor belt 400 to rotate to convey the coal powder. At the same time, the drive motor A201 drives the reciprocating screw 101 to drive the scraper 106 to scrape off the coal ash adhered to the conveyor belt 400. The arc knife 105 cleans the coal ash adhered to the outside of the drive roller 202 and the driven roller 205 in time to avoid the coal powder dust adhering to the sprocket and chain surface, the coal powder dust agglomeration, and the sprocket and chain slipping, thereby ensuring the conveying efficiency of the coal powder conveyor.

[0061] Continue to refer Figures 4 to 9 A adding mechanism is provided above the shell 100 of the coal powder conveyor for adding coal powder to be conveyed, and the adding mechanism includes an adding bucket 301, which is welded to the top of the shell 100. The adding bucket 301 pours the coal ash to be conveyed into the shell 100. A round rod 302 is fixed to the inner wall of the adding bucket 301 by bolts, and a driving motor B303 is fixed to one end of the round rod 302 by bolts. A protective shell 310 is fixed to the outside of the driving motor B303 by bolts. The protective shell 301 prevents dust from entering the driving motor B303. A dome 320 is fixed above the protective shell 310 by bolts. The dome 302 prevents the protective shell 310 from blocking the coal powder. A spiral blade 304 is fixed to the rotating end of the driving motor B303 by bolts.

[0062] In this embodiment, the operator starts the drive motor B303, and the drive motor B303 drives the spiral blade 304 to rotate along the adding bucket 301, thereby preventing blockage during the coal powder adding process and ensuring the feeding pressure of the coal powder.

[0063] The present invention also provides a method for rapid load regulation of a coal-fired unit, which can use a system for rapid load regulation of a coal-fired unit according to an embodiment of the present invention. The method includes: when the boiler is running at a low load, a second type of coal mill is put into operation, and the second type of coal mill is operated at a high output, a part of the ground coal powder is input into the second type of coal powder burner in the boiler through a coal powder pipeline, and the other part of the coal powder enters a coal powder separator; regulating and shut-off devices are respectively arranged on the coal powder pipeline at the outlet of the second type of coal mill, and the amount of coal powder is adjusted and controlled by the corresponding regulating and shut-off devices; the spare coal powder passing through the coal powder separator enters the coal powder storage bin on one path, and the other path carries a trace amount of powder-containing air through a pipeline into the powder-containing burner and is sent to the boiler furnace for combustion, and the delivery amount of the trace amount of powder-containing air is controlled by the corresponding regulating and shut-off devices; when the coal-fired unit is required to When the load rises rapidly from low to high, the spare pulverized coal in the pulverized coal storage bin is immediately and quickly put into use, and sent to the inlet of the first type of pulverized coal burner through the pulverized coal conveyor, and then sent to the boiler for combustion. The amount of pulverized coal entering is adjusted by the corresponding regulating shut-off device. After the coal mill unit is fully operational, the corresponding regulating shut-off device is shut off to stop the conveyance of spare pulverized coal to the second type of pulverized coal burner, so as to achieve the goal of instantaneous pulverized coal delivery when the boiler load rises rapidly. When the unit is operating normally at high load, the pulverized coal at the outlet of the boiler coal mill unit is directly sent to the burner group through the pulverized coal pipeline and sent to the furnace for combustion. The regulating shut-off devices are all closed, and the pulverized coal burners are shut down.

[0064] Specifically, when the boiler is running at low load, the coal-fired unit load rapid adjustment system effectively increases the output of pulverized coal by putting the second-type coal mill into operation and putting it in a high-output operation state. A part of the pulverized coal is directly input into the second-type pulverized coal burner in the boiler through the pulverized coal pipeline to meet basic combustion needs, and the other part of the pulverized coal enters the pulverized coal classifier. The regulating and shut-off device arranged on the pulverized coal pipeline at the outlet of the second-type coal mill can accurately control the pulverized coal flow rate and ensure a stable supply of pulverized coal.

[0065] At the same time, the pulverized coal classifier guides part of the pulverized coal to the pulverized coal storage bin as a backup pulverized coal source. In addition, the pulverized coal classifier also allows a part of the pulverized coal to carry a trace amount of pulverized air through the pipeline into the pulverized burner, and directly send it to the boiler furnace for combustion, thereby controlling the delivery volume of the trace amount of pulverized air by adjusting the shut-off device, further optimizing the utilization efficiency of the pulverized coal.

[0066] When the coal-fired unit needs to be quickly increased from low load to high load, the system can immediately and quickly put into use the spare coal powder that has been ground in the coal powder storage bin. Through the coal powder conveyor, the coal powder is quickly sent to the entrance of the first type of coal powder burner to achieve instantaneous powder delivery and meet the needs of rapid boiler load increase. After all coal mill units are started and run at full output, the system will shut down the corresponding regulating shut-off device, stop the delivery of spare coal powder to the second type of coal powder burner, and achieve the goal of instantaneous powder delivery when the boiler is rapidly increased in load.

[0067] When the unit is operating normally at high load, the pulverized coal at the outlet of the boiler coal mill unit directly enters the burner group through the pulverized coal pipeline and is sent to the furnace for combustion. At this time, all regulating and shut-off devices are in the closed state, and the pulverized coal burner also stops running, ensuring the stability and economy of the system operation.

[0068] In this way, this method not only improves the load regulation capability of coal-fired units, but also optimizes the distribution and combustion process of pulverized coal, thereby quickly responding to changes in the load of coal-fired units. In addition, the system can reduce energy consumption and equipment wear when operating at low loads, and when the load needs to be increased quickly, it can quickly use the stored pulverized coal or increase the pulverized coal supply by adjusting the shut-off device to achieve a rapid response. This enables coal-fired units to adapt to grid demand more flexibly, improve operating efficiency and economy, and maintain operational stability.

[0069] In summary, the embodiments of the present invention can keep the running coal mill running at high or maximum output when the boiler is running at low load, and store the excess qualified coal powder in an independent coal powder storage bin as a spare coal powder source. When the unit is "rapidly climbing" from low load to high load, the spare coal powder is immediately and instantly put into use, and is directly sent to the coal powder pipeline at the burner inlet through the coal powder conveyor, and then sent to the furnace for combustion. After the coal mill is "fully started" and running at full output, the transportation of the spare coal powder is immediately shut off, so as to achieve "instantaneous" coal powder delivery when the boiler is rapidly loaded, and avoid the problem of slow load climbing caused by the restart of the coal mill and the inability of the coal powder making speed to keep up, so as to achieve "keeping up" with the coal powder making speed and "instantaneous" coal powder delivery when the boiler is rapidly loaded.

[0070] The embodiments of the present invention ensure that the boiler can quickly climb from low load to high load or full load, and solve the problem that the boiler load is difficult to increase quickly and cannot meet the "peak" demand of the power grid load due to the long time taken to restart the coal mill in the traditional way. The boiler can respond to the load changes of the power grid in time and better adapt to the requirements of the peak operation of the power grid.

[0071] The embodiment of the present invention shortens the transition time of boiler load from low to high by storing spare coal powder in advance, improves the boiler load response rate, enhances the flexibility and adaptability of the boiler in power grid peak regulation, and helps to improve the stability and reliability of the entire power grid. At the same time, by controlling the regulating and shutting device, not only can the rapid increase of the load of the coal-fired unit be achieved, but also the decrease rate of the load of the coal-fired unit can be effectively controlled.

[0072] This system does not affect the normal operation of the unit at high load, and can quickly and smoothly switch the powder supply mode during the process of rising from low load to high load, avoiding problems such as unstable boiler combustion and reduced efficiency caused by rapid load changes, ensuring that the boiler can operate efficiently, safely, stably and environmentally friendly for a long time, extending the service life of the boiler and reducing operation and maintenance costs.

[0073] The coal-fired conveyor provided by the present invention drives the driven roller and the reciprocating screw to rotate in linkage through the driving motor A under the transmission action of the toothed pulley B and the toothed belt B. The driving motor A drives the reciprocating screw to drive the scraper to scrape the coal ash adhered to the conveyor belt. The arc knife cleans the coal ash adhered to the outer side of the driving roller and the driven roller in time to prevent the coal dust from adhering to the sprocket and the chain surface, and prevents the sprocket and the chain from slipping, thereby ensuring the conveying efficiency of the coal-fired conveyor, thereby providing support for rapid load adjustment. The coal-fired conveyor provided by the present invention can also drive the spiral blade to rotate along the adding bucket through the driving motor B, thereby preventing the coal-fired adding process from being blocked while ensuring the coal-fired material discharge pressure, further improving the conveying efficiency.

[0074] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for rapid load adjustment of coal-fired units, characterized in that: include: a coal mill unit for obtaining pulverized coal to be burned in the boiler of the coal-fired unit and comprising a first type of coal mill and a second type of coal mill; a pulverized coal burner group, which is layered in the boiler and includes a first type of pulverized coal burner and a second type of pulverized coal burner, wherein the first type of pulverized coal burner corresponds to the first type of coal mill and is connected via a first type of pulverized coal pipeline, the second type of pulverized coal burner corresponds to the second type of coal mill and is connected via a second type of pulverized coal pipeline, and the second type of pulverized coal pipeline is provided with an adjustment and shutoff device, and the position of the adjustment and shutoff device on the second type of pulverized coal pipeline is adjustable; a pulverized burner, arranged in the boiler; as well as A pulverized coal classifier is connected to at least one of the second-type pulverized coal mills via the second-type pulverized coal pipeline to receive pulverized coal, and is respectively connected to the pulverized burner, the first-type pulverized coal burner and the second-type pulverized coal burner via the second-type pulverized coal pipeline to controllably transport pulverized coal to at least one of the following in a working state: the pulverized burner, one or more burners of the first-type pulverized coal burners and one or more burners of the second-type pulverized coal burners.

2. The system for rapid load adjustment of coal-fired units according to claim 1, characterized in that: Also includes: A pulverized coal storage bin is connected to the pulverized coal classifier via at least one of the first type pulverized coal pipeline or the second type pulverized coal pipeline to receive the pulverized coal from the pulverized coal classifier, and is connected to the first type pulverized coal burner and the second type pulverized coal burner via the second type pulverized coal pipeline.

3. The system for rapid load adjustment of coal-fired units according to claim 2, characterized in that: Also includes: A pulverized coal conveyor is disposed between the pulverized coal storage bin and the coal pulverizer unit and is suitable for conveying the pulverized coal from the pulverized coal storage bin to the pulverized coal burner unit.

4. The system for rapid load regulation of coal-fired units according to claim 3, characterized in that: The pulverized coal conveyor comprises: Housing (100); a cleaning mechanism, arranged inside the housing (100) and used for cleaning the coal ash adhered to the coal powder conveying element, the cleaning mechanism comprising an arc-shaped knife (105) and a scraper (106); a reciprocating screw (101) is arranged in the middle of the housing (100); a driving block (102) is arranged outside the reciprocating screw (101); a double-axis electric push rod (103) is arranged at one end of the driving block (102); a rubber seat (104) is arranged at the extended end of the double-axis electric push rod (103); the arc-shaped knife (105) is fixed to one end of the rubber seat (104) by bolts; and the scraper (106) is installed below the driving block (102); and A transmission mechanism is arranged on one side of the housing (100) and is used to drive the coal powder conveyor to convey the coal powder. The transmission mechanism comprises a toothed belt wheel A (203). A driving motor A (201) is arranged at one end of the housing (100). A driving roller (202) is arranged at the rotating end of the driving motor A (201). The toothed belt wheel A (203) is fixed to one end of the driving roller (202) by bolts. A toothed belt A (204) is arranged on the outer side of the toothed belt wheel A (203). A driven roller (205) is arranged at one end of the toothed belt A (204). A toothed belt wheel B (206) is arranged on one end of the driven roller (205). A toothed belt B (207) is arranged on the outer side of the toothed belt wheel B (206). One end of the toothed belt wheel B (207) is connected to the reciprocating screw rod (101) in a transmission manner.

5. The system for rapid load regulation of coal-fired units according to claim 4, characterized in that: An adding mechanism is arranged above the shell (100) for adding pulverized coal to be transported; the adding mechanism comprises an adding bucket (301), the adding bucket (301) is welded to the top of the shell (100), a round rod (302) is arranged on the inner wall of the adding bucket (301), a driving motor B (303) is arranged at one end of the round rod (302), and a spiral blade (304) is arranged at the rotating end of the driving motor B (303).

6. The system for rapid load regulation of coal-fired units according to claim 5, characterized in that: A protective shell (310) is disposed on the outer side of the driving motor B (303), and a dome (320) is disposed on the top of the protective shell (310).

7. The system for rapid load regulation of coal-fired units according to claim 4, characterized in that: A plurality of material blocking inclined plates (200) are arranged at the bottom of the shell (100), and a material unloading blocking plate (300) is arranged at the outer side of the shell (100).

8. The system for rapid load regulation of coal-fired units according to claim 4, characterized in that: Telescopic protective covers (110) are provided at both ends of the driving block (102), and a sliding rod (120) is provided at the top of the driving block (102).

9. The system for rapid load regulation of coal-fired units according to claim 4, characterized in that: A box body (130) is arranged below the driving block (102), a lifting block (140) is arranged on the inner wall of the box body (130), an arc-shaped leaf spring (150) is arranged inside the box body (130), and the lifting block (140) is fixedly connected to the lifting block (140); and A conveyor belt (400) is arranged outside the driving roller (202) and the driven roller (205), and a plurality of shifting plates (500) are arranged outside the conveyor belt (400).

10. A method for rapid load regulation of a coal-fired unit, using a system according to any one of claims 3 to 9, characterized in that: The method comprises: When the boiler is running at low load, the second type coal mill is put into operation and operated at high output. Part of the pulverized coal is input into the second type coal burner in the boiler through the coal pipeline, and the other part of the pulverized coal enters the coal separator. The outlet coal pipeline of the second type coal mill is respectively provided with regulating and shutoff devices, and the amount of pulverized coal is regulated and controlled by the corresponding regulating and shutoff devices. The spare pulverized coal from the pulverized coal classifier enters the pulverized coal storage bin, and the other part carries a trace amount of pulverized air through the pipeline into the pulverized burner and is sent to the boiler furnace for combustion. The amount of pulverized air delivered is controlled by adjusting the shut-off device accordingly. When the coal-fired unit is required to quickly ramp up from low load to high load, the spare pulverized coal that has been ground in the pulverized coal storage bin is immediately put into use and sent to the inlet of the first type of pulverized coal burner through the pulverized coal conveyor to send the pulverized coal into the boiler for combustion, and the amount of pulverized coal entering is adjusted by the corresponding adjustment and shut-off device; After the coal mill units are fully operational, the corresponding regulating and shut-off devices are turned off to stop the delivery of standby pulverized coal to the second type of pulverized coal burners, thus achieving the goal of instantaneous pulverized coal delivery when the boiler is rapidly loaded; When the unit is operating normally at high load, the pulverized coal at the outlet of the boiler pulverizing unit is directly sent into the furnace through the pulverized coal pipeline to the burner group for combustion, all regulating and shut-off devices are closed, and the pulverized burners are shut down.

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