Power station boiler combustion device and system

Abstract

The utility model discloses a power station boiler combustion device and system and relates to the technical field of pulverized coal boilers, a coal mill of the power station boiler combustion device is used for grinding pulverized coal and conveying the pulverized coal to a pulverized coal separation device, and the pulverized coal separation device is used for conveying most of the ground fine pulverized coal to a boiler. A small part of the ground fine pulverized coal and exhaust gas mixture is conveyed to a bag dust removal device, the bag dust removal device is used for separating the small part of the fine pulverized coal and exhaust gas mixture, the separated fine pulverized coal enters a boiler to participate in combustion, and the separated exhaust gas is heated through an air preheating device and enters the boiler to participate in combustion. The bag-type dust removal device is used for separating a small part of pulverized coal and exhaust gas mixture after grinding, and the air preheating device is used for heating the separated exhaust gas, so that the temperature of the exhaust gas entering the boiler and the combustion stability of the boiler are improved, the pulverized coal in the boiler can be fully burnt out, and the combustion efficiency of the boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverized coal boilers, in particular to a combustion device and system for a power station boiler. Background Art

[0002] Generally speaking, a power plant boiler is a boiler used to generate electricity in a power plant. It usually has a large capacity, with the main unit being 600MW. The more advanced ones are supercritical boilers with a capacity of up to 1000MW. There are two main types of power plant boilers: pulverized coal furnaces and circulating fluidized bed boilers. Pulverized coal furnaces grind coal into very fine pulverized coal in advance to increase the contact surface area between the pulverized coal and the air, intensify the combustion, and increase the temperature inside the pulverized coal furnace. Therefore, except for coal of very poor quality, all kinds of coal can be effectively burned in pulverized coal furnaces, and the combustion is relatively complete, with a relatively high combustion efficiency of about 88%-93%.

[0003] Most of the existing pulverizing systems for smokeless anthracite boilers use steel ball mills for pulverizing and intermediate storage silo-type hot air pulverizing, and the low-temperature exhaust gas carrying a large amount of pulverized coal is directly sent into the furnace through a pipeline to participate in combustion. However, in this pulverizing system, the low-temperature exhaust gas carrying a large amount of pulverized coal directly rushing into the furnace will affect the stability of the furnace combustion, making it difficult for the pulverized coal in the boiler to be fully burned, and reducing the boiler combustion efficiency. Utility Model Content

[0004] The embodiment of the utility model provides a power station boiler combustion device and system to solve the technical problem in the existing boiler pulverizing system in the related technology that low-temperature exhaust gas carrying a large amount of coal powder directly rushes into the furnace, which affects the stability of the furnace combustion, makes it difficult for the coal powder in the boiler to be fully burned, and reduces the boiler combustion efficiency.

[0005] In a first aspect, a power plant boiler combustion device is provided, comprising:

[0006] The coal mill, coal powder separation device, bag dust removal device, air preheating device and boiler are connected in sequence;

[0007] The coal mill is used to grind coal powder and transport it to the coal powder separation device;

[0008] The pulverized coal separation device is used to transport most of the ground fine pulverized coal to the boiler, and transport a small portion of the ground fine pulverized coal and exhaust gas mixture to the bag dust removal device;

[0009] The bag dust removal device is used to separate a small portion of the fine coal powder and the exhaust gas mixture. The separated fine coal powder enters the boiler to participate in combustion, and the separated exhaust gas is heated by the air preheating device and enters the boiler to participate in combustion.

[0010] In some embodiments, the power station boiler combustion device further comprises:

[0011] A powder bin, one end of which is connected to the coal powder separation device and the bag dust removal device respectively, and the other end is connected to the boiler. The powder bin is used to collect most of the fine coal powder in the coal powder separation device and a small part of the fine coal powder separated by the bag dust removal device.

[0012] In some embodiments, the bag dust removal device includes:

[0013] A bag dust collector, the bag dust collector is connected to the coal powder separation device and is used to separate a small portion of fine coal powder and exhaust gas mixture output by the coal powder separation device;

[0014] An auger conveyor, the auger conveyor is arranged at the bottom of the bag dust collector, and is used to convey a small portion of fine coal powder separated by the bag dust collector;

[0015] The first air locker has one end connected to the auger conveyor and the other end connected to the powder bin. The first air locker is used to adjust the amount of a small portion of fine coal powder entering the powder bin.

[0016] In some embodiments, the air preheating device comprises:

[0017] An air supply component, the air supply component is connected to the bag filter and is used to transport the exhaust gas separated by the bag filter;

[0018] An air preheater, one end of which is connected to the air supply assembly, and the other end of which is respectively connected to the boiler and the coal mill, and the air preheater is used to heat the exhaust gas separated by the bag filter.

[0019] In some embodiments, the air supply assembly includes:

[0020] a first regulating door, wherein one end of the first regulating door is connected to the bag filter, and the other end of the first regulating door is connected to the air preheater;

[0021] a second regulating door, one end of which is also connected to the bag filter;

[0022] An air blower, one end of which is connected to the other end of the second regulating door, and the other end of which is connected to the other end of the first regulating door and the air preheater, and the first regulating door and the second regulating door cooperate to adjust the amount of exhaust air delivered to both ends of the air blower.

[0023] In some embodiments, wind boxes are provided on both sides of the boiler, and the two wind boxes are respectively a first wind box and a second wind box. The air preheater is respectively connected to the first wind box, the second wind box and the coal mill, and the first wind box and the second wind box are used to adjust the amount of exhaust gas entering the boiler.

[0024] In some embodiments, the pulverized coal separation device comprises:

[0025] A coarse powder separator, the coarse powder separator is connected to both ends of the coal mill, and is used to grind and separate the coal powder in the coal mill for multiple times until the coal powder reaches a preset fineness;

[0026] A fine powder separator, one end of which is connected to the coarse powder separator, and the other end of which is connected to the powder bin, and the fine powder separator is used to transport most of the fine coal powder to the powder bin;

[0027] A second air lock, one end of which is connected to the fine powder separator, and the other end of which is connected to the powder bin, and the second air lock is used to adjust the amount of most of the fine coal powder entering the powder bin.

[0028] In some embodiments, the pulverized coal separation device further comprises:

[0029] A powder discharge component, one end of which is connected to the fine powder separator, and the other end of which is connected to the bag dust collector. The powder discharge component is used to transport a small portion of the fine coal powder and exhaust gas mixture to the bag dust collector.

[0030] In some embodiments, the powder discharge assembly includes:

[0031] a third regulating door, one end of which is connected to the fine powder separator;

[0032] A powder exhaust fan, one end of which is connected to the other end of the third regulating door, the other end of which is connected to the bag dust removal device, and the powder exhaust fan cooperates with the third regulating door to adjust the exhaust air volume in the pipeline.

[0033] In a second aspect, a power plant boiler combustion system is provided, comprising the aforementioned power plant boiler combustion device.

[0034] The beneficial effects brought by the technical solution provided by the utility model include:

[0035] The utility model embodiment provides a power station boiler combustion device and system, the power station boiler combustion device includes a coal mill, a coal powder separation device, a bag dust removal device, an air preheating device and a boiler connected in sequence, the coal mill is used to grind coal powder and transport it to the coal powder separation device, the coal powder separation device is used to transport most of the fine coal powder after grinding to the boiler, and transport a small part of the fine coal powder and exhaust gas mixture after grinding to the bag dust removal device, the bag dust removal device is used to separate a small part of the fine coal powder and the exhaust gas mixture, the separated fine coal powder enters the boiler to participate in combustion, and the separated exhaust gas is heated by the air preheating device and enters the boiler to participate in combustion. The utility model separates the small part of the fine coal powder and the exhaust gas mixture after grinding through the bag dust removal device, and heats the separated exhaust gas through the air preheating device, so that the separated fine coal powder and the heated exhaust gas enter the boiler together to participate in combustion, thereby increasing the exhaust gas temperature entering the boiler, and further improving the stability of boiler combustion, so that the coal powder in the boiler can be fully burned, and the boiler combustion efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic diagram of the structure of a power station boiler combustion device provided by an embodiment of the utility model;

[0038] Reference numerals:

[0039] 1. Coal mill;

[0040] 2. Coal powder separation device; 21. Coarse powder separator; 22. Fine powder separator; 23. Second air lock; 24. Coal powder discharge assembly; 241. Third regulating door; 242. Coal powder discharge fan;

[0041] 3. Bag dust removal device; 31. Bag dust collector; 32. Auger conveyor; 33. First air lock;

[0042] 4. air preheating device; 41. air supply assembly; 411. first regulating door; 412. second regulating door; 413. air supply fan; 42. air preheater;

[0043] 5. boiler; 51. bellows; 511. first bellows; 512. second bellows;

[0044] 6. Powder bin. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] The embodiment of the utility model provides a power station boiler combustion device and system, which can solve the technical problem that in the existing boiler pulverizing system, low-temperature exhaust gas carrying a large amount of coal powder directly rushes into the furnace, affecting the stability of the furnace combustion, making it difficult for the coal powder in the boiler to be fully burned, and reducing the boiler combustion efficiency.

[0047] Figure 1 A power station boiler combustion device provided by an embodiment of the utility model comprises: a coal mill 1, a coal powder separation device 2, a bag dust removal device 3, an air preheating device 4 and a boiler 5 connected in sequence, wherein the coal mill 1 is used to grind coal powder and convey it to the coal powder separation device 2, the coal powder separation device 2 is used to convey most of the ground fine coal powder to the boiler 5, and convey a small part of the ground fine coal powder and exhaust gas mixture to the bag dust removal device 3, the bag dust removal device 3 is used to separate a small part of the fine coal powder and the exhaust gas mixture, the separated fine coal powder enters the boiler 5 to participate in combustion, and the separated exhaust gas is heated by the air preheating device 4 and enters the boiler 5 to participate in combustion.

[0048] The utility model discloses a power station boiler combustion device, which is provided with a coal mill, a coal powder separation device, a bag dust removal device, an air preheating device and a boiler. The coal mill conveys the ground coal powder to the coal powder separation device, the coal powder separation device conveys most of the ground fine coal powder to the boiler for combustion, the coal powder separation device also conveys a small part of the ground fine coal powder and exhaust gas mixture to the bag dust removal device for separation, the separated fine coal powder enters the boiler for combustion, the separated exhaust gas is heated by the air preheating device and enters the boiler for combustion, the separated exhaust gas is heated by the air preheating device, the separated fine coal powder and the heated exhaust gas enter the boiler together for combustion, the exhaust gas temperature entering the furnace is increased, and the stability of the furnace combustion is further increased, the coal powder in the boiler can be fully burned, and the boiler combustion efficiency is improved.

[0049] As an optional implementation, in a utility model embodiment, see Figure 1As shown, the power station boiler combustion device also includes: a powder bin 6, one end of the powder bin 6 is respectively connected to the coal powder separation device 2 and the bag dust removal device 3, and the other end is connected to the boiler 5. The powder bin 6 is used to collect most of the fine coal powder in the coal powder separation device 2 and a small part of the fine coal powder separated by the bag dust removal device 3. The fine coal powder is stored separately through the powder bin 6 and transported to the boiler 5 to participate in combustion. When the power station boiler pulverizing system fails, the furnace can be processed without stopping for a short time, and the coal powder can be fully burned.

[0050] As an optional implementation, in a utility model embodiment, see Figure 1 As shown, the bag dust collector 3 includes: a bag dust collector 31, an auger conveyor 32 and a first air lock 33. The bag dust collector 31 is connected to the coal powder separation device 2 and is used to separate a small part of fine coal powder and the exhaust gas mixture output by the coal powder separation device 2. The auger conveyor 32 is arranged at the bottom of the bag dust collector 31 and is used to convey the small part of fine coal powder separated by the bag dust collector 31. One end of the first air lock 33 is connected to the auger conveyor 32, and the other end is connected to the powder bin 6. The first air lock 33 is used to adjust the amount of the small part of fine coal powder entering the powder bin 6. The bag dust collector 31 controls the coal powder separation device 2. The collection efficiency of the small part of fine coal powder output by device 2 is as high as 99%. The small part of fine coal powder can be completely separated from the exhaust gas mixture, so that the separated exhaust gas is not mixed with coal powder, the carbon content of fly ash is reduced, and the burnout efficiency of coal powder and the boiler combustion efficiency are improved. At the same time, the first air lock 33 is arranged between the auger conveyor 32 and the powder bin 6. The first air lock 33 is in a normally closed state. When the amount of the small part of fine coal powder transported by the auger conveyor 32 exceeds its preset value, the first air lock 33 opens to transport the small part of fine coal powder to the powder bin 6. At the same time, the first air lock 33 only allows coal powder to pass through, blocking the circulation of airflow, which can effectively prevent coal powder from overflowing.

[0051] As an optional implementation, in a utility model embodiment, see Figure 1As shown, the air preheating device 4 includes: an air supply component 41 and an air preheater 42. The air supply component 41 is connected to the bag-type dust collector 31, and is used to transport the exhaust gas separated by the bag-type dust collector 31. One end of the air preheater 42 is connected to the air supply component 41, and the other end is respectively connected to the boiler 5 and the coal mill 1. The air preheater 42 is used to heat the exhaust gas separated by the bag-type dust collector 31. The clean exhaust gas separated by the bag-type dust collector 31 is transported to the air preheater 42 through the air supply component 41 and heated. The heated exhaust gas enters the boiler 5 to participate in combustion, thereby increasing the exhaust gas temperature entering the boiler, and further improving the stability of boiler combustion, avoiding the negative impact of NOX generation and reduction, achieving energy conservation and emission reduction, and greatly improving the ability of the boiler to participate in deep peak regulation.

[0052] As an optional implementation, in a utility model embodiment, see Figure 1 As shown, the air supply component 41 includes: a first regulating door 411, a second regulating door 412 and an air blower 413, one end of the first regulating door 411 is connected to the bag dust collector 31, and the other end is connected to the air preheater 42, one end of the second regulating door 412 is also connected to the bag dust collector 31, one end of the air blower 413 is connected to the other end of the second regulating door 412, and the other end of the air blower 413 is connected to the other end of the first regulating door 411 and the air preheater 42, the first regulating door 411 and the second regulating door 412 cooperate to adjust the exhaust air volume delivered to the two ends of the air blower 413, and the clean exhaust air separated by the bag dust collector 31 passes through the first regulating door 411 and the The second regulating door 412 is used to transport the exhaust gas to the blower 413. Meanwhile, an air inlet end is provided at the inlet of the blower 413. The first regulating door 411 and the second regulating door 412 are respectively provided at the inlet and outlet ends of the blower 413. The proportion of the exhaust gas before and after the blower 413 can be adjusted according to the climate and temperature. In winter, more exhaust gas can be allocated to the inlet of the blower 413 by reducing the first regulating door 411 and increasing the second regulating door 412, which can further play the role of warm air, increase the exhaust gas temperature, and make the exhaust gas and air pass through the air preheater 42 together to heat until the temperature rises to above 300°C, and enter the boiler 5 to participate in combustion, thereby avoiding low-temperature exhaust gas and air entering the boiler to affect its combustion stability.

[0053] As an optional implementation, in a utility model embodiment, see Figure 1As shown, wind boxes 51 are provided on both sides of the boiler 5, and the two wind boxes 51 are respectively a first wind box 511 and a second wind box 512. The air preheater 42 is respectively connected to the first wind box 511, the second wind box 512 and the coal mill 1. The first wind box 511 and the second wind box 512 are used to adjust the amount of exhaust gas entering the boiler 5. By adjusting the amount of exhaust gas entering the boiler 5, the boiler 5 has a good working condition and a high thermal efficiency. The outlet end of the air preheater 42 is also connected to the coal mill 1, and an adjusting door is also provided between the air preheater 42 and the coal mill 1 for adjusting the amount of air and exhaust gas entering the coal mill 1, which further enables the utility model to have a good working condition and a high thermal efficiency.

[0054] As an optional implementation, in a utility model embodiment, see Figure 1 As shown, the coal powder separation device 2 includes: a coarse powder separator 21, a fine powder separator 22 and a second air lock 23. The coarse powder separator 21 is connected to both ends of the coal mill 1 respectively. The coarse powder separator 21 is used to grind and separate the coal powder in the coal mill 1 for multiple times until the coal powder reaches a preset fineness. One end of the fine powder separator 22 is connected to the coarse powder separator 21, and the other end is connected to the powder bin 6. The fine powder separator 22 is used to transport most of the fine coal powder to the powder bin 6. One end of the second air lock 23 is connected to the fine powder separator 22, and the other end is connected to the powder bin 6. The second air lock 23 is used to adjust most of the fine coal powder entering the powder bin 6. The amount of fine coal powder, the coarse powder separator 21 grinds the coal powder in the pulverizer 1 for multiple times until the coal powder fineness is 10% to 12%, and the coal blocks are ground and separated by the coarse powder separator 21 and the fine powder separator 22, thereby improving the coal powder collection efficiency and the coal powder burnout capacity. The fine powder separator 22 conveys most of the fine coal powder to the powder bin 6 through the second air lock 23, and the second air lock 23 is in a normally closed state. When most of the fine coal powder exceeds its preset value, the second air lock 23 opens to convey most of the fine coal powder to the powder bin 6. At the same time, the second air lock 23 only allows coal powder to pass through, blocking the circulation of airflow, which can effectively prevent coal powder from overflowing.

[0055] As an optional implementation, in a utility model embodiment, see Figure 1As shown, the coal powder separation device 2 also includes: a powder discharge component 24, one end of the powder discharge component 24 is connected to the fine powder separator 22, and the other end is connected to the bag-type dust collector 3, the powder discharge component 24 is used to convey a small portion of the fine coal powder and exhaust gas mixture to the bag-type dust collector 3, the fine powder separator 22 conveys most of the fine coal powder to the powder bin 6, and a small portion of the fine coal powder and exhaust gas mixture is conveyed to the bag-type dust collector 3 through the powder discharge component 24 and separated by the bag-type dust collector 3.

[0056] As an optional implementation, in a utility model embodiment, see Figure 1 As shown, the powder exhaust component 24 includes: a third regulating door 241 and a powder exhaust fan 242, one end of the third regulating door 241 is connected to the fine powder separator 22, one end of the powder exhaust fan 242 is connected to the other end of the third regulating door 241, and the other end of the powder exhaust fan 242 is connected to the bag dust removal device 3, the powder exhaust fan 242 cooperates with the third regulating door 241 to adjust the exhaust gas volume in the pipeline, and the exhaust gas volume from the fine powder separator 22 to the powder exhaust fan 242 is adjusted by adjusting the third regulating door 241 to ensure that the boiler 5 has a good working condition and a high thermal efficiency, and avoid the exhaust gas volume being too low or too high, resulting in the fuel in the boiler 5 not being fully burned, and the powder exhaust fan 242 is used to transport a small part of the fine coal powder and exhaust gas mixture to the bag dust removal device 3, and the powder exhaust fan 242 is the power source for the flow of the gas-powder mixture, and it overcomes the resistance in the flow process and completes the pneumatic conveying of coal powder.

[0057] The utility model also provides a power station boiler combustion system, including the aforementioned power station boiler combustion device, the power station boiler combustion device including a coal mill 1, a coal powder separation device 2, a bag dust removal device 3, an air preheating device 4 and a boiler 5 connected in sequence, the coal mill 1 is used to grind coal powder and convey it to the coal powder separation device 2, the coal powder separation device 2 is used to convey most of the ground fine coal powder to the boiler 5, and convey a small part of the ground fine coal powder and exhaust gas mixture to the bag dust removal device 3, the bag dust removal device 3 is used to separate a small part of the fine coal powder and the exhaust gas mixture, the separated fine coal powder enters the boiler 5 to participate in combustion, and the separated exhaust gas is heated by the air preheating device 4 and enters the boiler 5 to participate in combustion.

[0058] The utility model discloses a power station boiler combustion system, wherein the power station boiler combustion device is provided with a coal mill, a coal powder separation device, a bag dust removal device, an air preheating device and a boiler, wherein the coal mill conveys the ground coal powder to the coal powder separation device, the coal powder separation device conveys most of the ground fine coal powder to the boiler for combustion, the coal powder separation device also conveys a small part of the ground fine coal powder and exhaust gas mixture to the bag dust removal device for separation, the separated fine coal powder enters the boiler for combustion, the separated exhaust gas is heated by the air preheating device and enters the boiler for combustion, the separated exhaust gas is heated by the air preheating device, so that the separated fine coal powder and the heated exhaust gas enter the boiler together for combustion, thereby increasing the exhaust gas temperature entering the furnace, and further increasing the stability of the furnace combustion, so that the coal powder in the boiler can be fully burned, thereby improving the boiler combustion efficiency.

[0059] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0060] It should be noted that, in the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0061] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A power plant boiler combustion device, characterized in that: include: A coal mill (1), a coal powder separation device (2), a bag dust removal device (3), an air preheating device (4) and a boiler (5) connected in sequence; The coal mill (1) is used to grind coal powder and transport it to the coal powder separation device (2); The pulverized coal separation device (2) is used to transport the majority of the ground fine pulverized coal to the boiler (5), and to transport a small portion of the ground fine pulverized coal and exhaust gas mixture to the bag dust removal device (3); The bag dust removal device (3) is used to separate a small portion of the fine coal powder and the exhaust gas mixture. The separated fine coal powder enters the boiler (5) to participate in combustion, and the separated exhaust gas is heated by the air preheating device (4) and enters the boiler (5) to participate in combustion.

2. The power plant boiler combustion device according to claim 1, characterized in that: Also includes: A powder bin (6), one end of which is connected to the coal powder separation device (2) and the bag dust removal device (3), respectively, and the other end is connected to the boiler (5). The powder bin (6) is used to collect most of the fine coal powder in the coal powder separation device (2) and a small part of the fine coal powder separated by the bag dust removal device (3).

3. The power plant boiler combustion device according to claim 2, characterized in that: The bag dust removal device (3) comprises: A bag dust collector (31), the bag dust collector (31) being connected to the coal powder separation device (2) and used for separating a small portion of fine coal powder and exhaust gas mixture output by the coal powder separation device (2); An auger conveyor (32), the auger conveyor (32) being arranged at the bottom of the bag dust collector (31) and being used for conveying a small portion of fine coal powder separated by the bag dust collector (31); A first air lock (33), one end of which is connected to the auger conveyor (32), and the other end of which is connected to the powder bin (6), and the first air lock (33) is used to adjust the amount of a small portion of fine coal powder entering the powder bin (6).

4. The power plant boiler combustion device according to claim 3, characterized in that: The air preheating device (4) comprises: An air supply component (41), the air supply component (41) being connected to the bag dust collector (31) and used for conveying the exhaust gas separated by the bag dust collector (31); An air preheater (42), one end of the air preheater (42) is connected to the air supply assembly (41), and the other end is respectively connected to the boiler (5) and the coal mill (1), and the air preheater (42) is used to heat the exhaust gas separated by the bag filter (31).

5. The power plant boiler combustion device according to claim 4, characterized in that: The air supply component (41) comprises: A first regulating door (411), one end of the first regulating door (411) being connected to the bag filter (31), and the other end of the first regulating door (411) being connected to the air preheater (42); A second regulating door (412), one end of which is also connected to the bag filter (31); An air supply fan (413), one end of the air supply fan (413) is connected to the other end of the second regulating door (412), the other end of the air supply fan (413) is connected to the other end of the first regulating door (411) and the air preheater (42), the first regulating door (411) and the second regulating door (412) cooperate to adjust the amount of exhaust air delivered to both ends of the air supply fan (413).

6. The power plant boiler combustion device according to claim 4, characterized in that: Wind boxes (51) are provided on both sides of the boiler (5), the two wind boxes (51) are respectively a first wind box (511) and a second wind box (512), the air preheater (42) is respectively connected to the first wind box (511), the second wind box (512) and the coal mill (1), the first wind box (511) and the second wind box (512) are used to adjust the amount of exhaust gas entering the boiler (5).

7. The power plant boiler combustion device according to claim 2, characterized in that: The pulverized coal separation device (2) comprises: a coarse powder separator (21), the coarse powder separator (21) being connected to both ends of the coal mill (1) respectively, and the coarse powder separator (21) being used to grind and separate the coal powder in the coal mill (1) for multiple times until the coal powder reaches a preset fineness; a fine powder separator (22), one end of the fine powder separator (22) being connected to the coarse powder separator (21), and the other end of the fine powder separator (22) being connected to the powder bin (6), and the fine powder separator (22) being used to transport most of the fine coal powder to the powder bin (6); A second air lock (23), one end of the second air lock (23) is connected to the fine powder separator (22), and the other end is connected to the powder bin (6), and the second air lock (23) is used to adjust the amount of most of the fine coal powder entering the powder bin (6).

8. The power plant boiler combustion device according to claim 7, characterized in that: The pulverized coal separation device (2) further comprises: A powder discharge component (24), one end of which is connected to the fine powder separator (22), and the other end of which is connected to the bag dust removal device (3), and the powder discharge component (24) is used to transport a small portion of the fine coal powder and exhaust gas mixture to the bag dust removal device (3).

9. The power plant boiler combustion device according to claim 8, characterized in that: The powder discharge assembly (24) comprises: a third regulating door (241), one end of the third regulating door (241) being connected to the fine powder separator (22); A powder exhaust fan (242), one end of the powder exhaust fan (242) is connected to the other end of the third adjustment door (241), the other end of the powder exhaust fan (242) is connected to the bag dust removal device (3), and the powder exhaust fan (242) cooperates with the third adjustment door (241) to adjust the exhaust air volume in the pipeline.

10. A power plant boiler combustion system, characterized in that: It comprises the power station boiler combustion device as described in any one of claims 1-9.

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