A coal feeding and spreading device for a circulating fluidized bed boiler and a circulating fluidized bed boiler

Abstract

The present invention relates to the technical field of circulating fluidized bed boilers, and discloses a coal feeding and spreading device for a circulating fluidized bed boiler and a circulating fluidized bed boiler. The coal feeding and spreading device for the circulating fluidized bed boiler includes: a coal feeding pipe; a coal spreading air pipe arranged below the coal feeding pipe, and the coal spreading air blown out by the coal spreading air pipe can blow the pulverized coal conveyed by the coal feeding pipe into the furnace; a wear-resistant refractory member protruding on the furnace body and wrapping the outlets of the coal feeding pipe and the coal spreading air pipe, the outlet end of the coal feeding pipe is located inside the wear-resistant refractory member, and a coal feeding port communicating with the coal feeding pipe is provided on the wear-resistant refractory member; an air volume adjusting member arranged on the coal spreading air pipe to adjust the air volume of the coal spreading air blown out by the coal spreading air pipe. The coal feeding and spreading device for the circulating fluidized bed boiler disclosed by the present invention solves the problems that the outlet end of the coal feeding pipe is prone to deformation, cracking and wear, etc., and at the same time avoids the occurrence of phenomena such as the falling off of the refractory material around the outlet end of the coal feeding pipe and the leakage of the water wall tube.

Description

Technical Field

[0001] The present invention relates to the technical field of circulating fluidized bed boilers, and particularly to a coal feeding and spreading device for a circulating fluidized bed boiler and a circulating fluidized bed boiler. Background Art

[0002] Most of the existing large-capacity circulating fluidized bed boilers feed coal through a coal feeding pipe on the front wall. The coal feeding pipe is usually made of stainless steel plate or cast steel. The outlet end of the coal feeding pipe is in the dense phase zone of the furnace. When the boiler is operating normally, the furnace temperature is generally between 850°C and 950°C. The height of the outlet end of the coal feeding pipe from the air distribution plate is relatively low, so that the outlet end of the coal feeding pipe near the front wall cannot effectively spread the pulverized coal, and the pulverized coal cannot effectively reach the inside of the furnace, resulting in uneven temperature inside the furnace. Since the pulverized coal concentration near the outlet end of the coal feeding pipe on the front wall is relatively large, the temperature near the outlet end of the coal feeding pipe is relatively high. In this environment, the outlet end of the coal feeding pipe is long-term exposed to high-temperature radiation, combined with the temperature change of the furnace caused by the change of the unit load and the erosion of the high-temperature flue gas in the furnace. The coal feeding pipe is long-term affected by the thermal stress of alternating hot and cold, resulting in a decrease in the material performance strength of the coal feeding pipe and a reduction in the wear resistance, and it is more likely to be worn through by the pulverized coal. As the unit capacity increases, the cross-sectional area of the outlet end of the coal feeding pipe increases correspondingly, and its rigidity becomes poor. Eventually, the outlet end of the coal feeding pipe is prone to problems such as deformation, cracking and wear, resulting in derivative problems such as the falling off of the refractory material around the outlet end of the coal feeding pipe and the leakage of the water wall tube, seriously affecting the long-term stable operation of the boiler.

[0003] In order to improve the coal feeding and spreading ability, the prior art provides coal feeding air to the coal feeding pipe through an additional coal delivery air pipe. The coal delivery air of the coal delivery air pipe is in the same flow direction as the pulverized coal in the coal feeding pipe. The added coal delivery air pipe cannot effectively send the pulverized coal into the furnace. Therefore, the problems such as deformation, cracking and wear of the outlet end of the coal feeding pipe still cannot be solved. Summary of the Invention

[0004] Based on the above, the purpose of the present invention is to provide a coal feeding and spreading device for a circulating fluidized bed boiler and a circulating fluidized bed boiler, which solves the problems such as deformation, cracking and wear of the outlet end of the coal feeding pipe existing in the prior art, and at the same time avoids the occurrence of phenomena such as the falling off of the refractory material around the outlet end of the coal feeding pipe and the leakage of the water wall tube.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A coal feeding and spreading device for a circulating fluidized bed boiler, comprising: a coal feeding pipe for conveying pulverized coal to the furnace body; a coal spreading air pipe arranged below the coal feeding pipe, and the coal spreading air blown out by the coal spreading air pipe can blow the pulverized coal conveyed by the coal feeding pipe into the furnace; a wear-resistant refractory member protruding on the furnace body and the wear-resistant refractory member wraps the outlet of the coal feeding pipe and the outlet of the coal spreading air pipe, the outlet end of the coal feeding pipe is located inside the wear-resistant refractory member, and a coal feeding port communicating with the coal feeding pipe is arranged on the wear-resistant refractory member; an air volume adjusting member, and the air volume adjusting member is arranged on the coal spreading air pipe to adjust the air volume of the coal spreading air blown out by the coal spreading air pipe.

[0007] As a preferred scheme of a coal feeding and spreading device for a circulating fluidized bed boiler, the pulverized coal discharged from the coal feeding port flows horizontally or obliquely downward, the coal spreading air discharged from the outlet of the coal spreading air pipe flows horizontally or obliquely downward, the included angle between the flowing direction of the pulverized coal and the horizontal direction is a first included angle, the included angle between the coal spreading air and the horizontal direction is a second included angle, and the second included angle is less than or equal to the first included angle.

[0008] As a preferred scheme of a coal feeding and spreading device for a circulating fluidized bed boiler, the second included angle is between 0° and 10°.

[0009] As a preferred scheme of a coal feeding and spreading device for a circulating fluidized bed boiler, the coal feeding pipe is a rectangular pipe, the bottom surface of the coal feeding port is a coal feeding outlet surface, and the included angle between the coal feeding outlet surface and the lower bottom plate of the rectangular pipe is a third included angle, and the third included angle is between 170° and 180°.

[0010] As a preferred scheme of a coal feeding and spreading device for a circulating fluidized bed boiler, a turtleback net is arranged between the coal spreading air pipe and the coal feeding pipe, the turtleback net is fixedly arranged on the furnace body, and the wear-resistant refractory member is filled in the turtleback net.

[0011] As a preferred scheme of a coal feeding and spreading device for a circulating fluidized bed boiler, the coal feeding and spreading device of the circulating fluidized bed boiler further comprises a refractory component, the refractory component comprises a sealing box and a heat preservation member, the sealing box is fixedly arranged on the furnace body and defines a chamber therein, the heat preservation member is filled in the chamber, one end of the wear-resistant refractory member is located in the chamber, and the other end extends out of the sealing box and extends into the furnace.

[0012] As a preferred solution of the coal feeding and spreading device for a circulating fluidized bed boiler, the coal spreading air duct includes a coal spreading air connecting pipe and a plurality of coal spreading air branch pipes. The inlet of the coal spreading air connecting pipe is communicated with the outlet of the coal feeding air duct, the primary air duct, the fluidizing air duct, the recirculating flue gas duct or the fan. The outlet of the coal spreading air connecting pipe is simultaneously communicated with a plurality of the coal spreading air branch pipes. The plurality of coal spreading air branch pipes are arranged side by side, and the outlet of each coal spreading air branch pipe is communicated with the furnace.

[0013] As a preferred solution of the coal feeding and spreading device for a circulating fluidized bed boiler, the coal feeding and spreading device of the circulating fluidized bed boiler further includes a connecting piece, and the connecting piece is sleeved on one end of each coal spreading air branch pipe close to the furnace.

[0014] As a preferred solution of the coal feeding and spreading device for a circulating fluidized bed boiler, an expansion joint is provided on the coal spreading air duct, and the expansion joint is configured to have an adjustable length.

[0015] A circulating fluidized bed boiler includes a furnace body, a coal feeding air duct and the coal feeding and spreading device of the circulating fluidized bed boiler according to any one of the above solutions. The wear-resistant refractory member is provided on the furnace body. The outlet of the coal feeding air duct is communicated with the coal feeding pipe. The coal feeding air duct is used to supply coal feeding air to the coal feeding pipe, and the coal feeding air duct is communicated with the coal spreading air duct.

[0016] The beneficial effects of the present invention are as follows: For the coal feeding and spreading device of the circulating fluidized bed boiler disclosed in the present invention, the coal spreading air blown out by the additionally provided coal spreading air duct can blow the pulverized coal conveyed by the coal feeding pipe into the furnace, reducing the probability of pulverized coal accumulating at the outlet of the coal feeding pipe. The additionally provided wear-resistant refractory member can reduce the direct erosion of the water-cooled wall near the coal feeding pipe or the refractory material around the outlet end of the coal feeding pipe by the pulverized coal, reducing the probability of the refractory material falling off around the outlet end of the coal pipe and the leakage of the water-cooled wall pipe, enabling the circulating fluidized bed boiler to operate safely. The additionally provided air volume adjusting member can adjust the air volume of the coal spreading air entering the furnace through the coal spreading air duct according to the actual operating conditions, so that the pulverized coal discharged from the coal feeding pipe can be blown to a suitable position. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the content of the embodiments of the present invention and these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the coal feeding and spreading device of the circulating fluidized bed boiler provided by a specific embodiment of the present invention;

[0019] Figure 2 is Figure 1 a partial enlarged view at A;

[0020] Figure 3 It is a diagram of the coal feeding air duct of the coal feeding and spreading device of the circulating fluidized bed boiler provided by a specific embodiment of the present invention.

[0021] In the figure:

[0022] 1. Coal feeding pipe; 2. Coal feeding air duct; 21. Coal feeding air connection pipe; 211. Main coal feeding air pipe; 212. Coal feeding air distribution pipe; 22. Coal feeding air branch pipe; 3. Wear-resistant and refractory part; 30. Coal feeding port; 4. Air volume adjusting part; 5. Refractory component; 51. Sealing box; 52. Heat preservation part; 6. Expansion joint;

[0023] 100. Furnace body; 1001. Furnace chamber; 200. Coal feeding air duct. Specific embodiments

[0024] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] This embodiment provides a coal feeding and spreading device for a circulating fluidized bed boiler, asFigures 1 to 3 As shown, the coal feeding and spreading device of this circulating fluidized bed boiler is arranged at the lower part of the furnace body 100 and includes a coal feeding pipe 1, a coal spreading air pipe 2, a wear-resistant and refractory member 3, and an air volume adjusting member 4. The coal feeding pipe 1 is used to convey pulverized coal to the furnace body 100. The coal spreading air pipe 2 is arranged below the coal feeding pipe 1. The coal spreading air blown out by the coal spreading air pipe 2 can blow the pulverized coal conveyed by the coal feeding pipe 1 into the furnace chamber 1001. The wear-resistant and refractory member 3 protrudes on the furnace body 100 and the wear-resistant and refractory member 3 wraps the outlets of the coal feeding pipe 1 and the coal spreading air pipe 2. The outlet end of the coal feeding pipe 1 is located inside the wear-resistant and refractory member 3. The wear-resistant and refractory member 3 is provided with a coal feeding port 30 communicating with the coal feeding pipe 1. The air volume adjusting member 4 is arranged on the coal spreading air pipe 2 to adjust the air volume of the coal spreading air blown out by the coal spreading air pipe 2.

[0028] It should be noted that the air volume adjusting member 4 of this embodiment can be an air volume regulating valve for adjusting the air volume. This air volume regulating valve is a manual air volume regulating valve or an electric air volume regulating valve to adjust the size of the air volume of the coal spreading air entering the furnace chamber 1001 through the coal spreading air pipe 2 per unit time.

[0029] The wear-resistant and refractory member 3 of this embodiment is made of a material with wear-resistant and refractory properties. Since the wear-resistant and refractory member 3 protrudes on the furnace body 100, the pulverized coal input into the furnace chamber 1001 through the coal feeding pipe 1 can first scour the wear-resistant and refractory member 3, rather than directly scouring the water-cooled wall, reducing the probability of damage to the water-cooled wall tubes. Setting the outlet of the coal feeding pipe 1 inside the wear-resistant and refractory member 3 reduces the influence of the outlet end of the coal feeding pipe 1 on high-temperature radiation, and at the same time, it will not be scoured by the high-temperature flue gas inside the furnace chamber 1001. The temperature at the outlet end of the coal feeding pipe 1 decreases, improving the material performance strength and wear resistance of the coal feeding pipe 1, reducing the probability of deformation, cracking, and abrasion of the outlet end of the coal feeding pipe 1, enabling the circulating fluidized bed boiler to operate stably.

[0030] For the coal feeding and spreading device of the circulating fluidized bed boiler provided in this embodiment, the coal spreading air blown out by the additional coal spreading air pipe 2 can blow the pulverized coal conveyed by the coal feeding pipe 1 into the furnace chamber 1001, reducing the probability of pulverized coal accumulating at the outlet of the coal feeding pipe 1. The additional wear-resistant and refractory member 3 can reduce the direct scouring of the water-cooled wall near the coal feeding pipe 1 or the refractory material around the outlet end of the coal feeding pipe 1, reducing the probability of the refractory material falling off around the outlet end of the coal pipe and the leakage of the water-cooled wall tubes, enabling the circulating fluidized bed boiler to operate safely. The additional air volume adjusting member 4 can adjust the air volume of the coal spreading air entering the furnace chamber 1001 through the coal spreading air pipe 2 according to the actual operating conditions, so that the pulverized coal discharged from the coal feeding pipe 1 can be blown to a suitable position.

[0031] As Figure 2As shown, the outlet end of the coal-feeding air duct 2 in this embodiment is flush with one end of the wear-resistant and refractory member 3 extending into the furnace 1001. The outlet end of the coal-feeding air duct 2 needs to face the erosion and roasting of the high-temperature pulverized coal in the furnace 1001. Therefore, the coal-feeding air duct 2 needs to be made of heat-resistant and wear-resistant steel to increase the wear resistance of the coal-feeding air duct 2. The pulverized coal discharged from the coal feeding port 30 flows horizontally or obliquely downward, and the coal-feeding air discharged from the outlet of the coal-feeding air duct 2 flows horizontally or obliquely downward. The included angle between the flowing direction of the pulverized coal and the horizontal direction is the first included angle, and the included angle between the coal-feeding air and the horizontal direction is the second included angle. The second included angle is less than or equal to the first included angle, and the second included angle is between 0° and 10°, so that the coal-feeding air can center the pulverized coal discharged from the coal feeding port 30 perpendicular to the cross-section of the furnace body 100, and increase the temperature uniformity inside the furnace 100.

[0032] The pulverized coal discharged through the coal feeding port 30 flowing horizontally or slightly downward can enable the pulverized coal in the coal feeding pipe 1 to smoothly enter the furnace 1001, preventing the pulverized coal from clogging in the coal feeding pipe 1. The second included angle being less than or equal to the first included angle can enable the coal-feeding air blown out in the coal-feeding air duct 2 to blow the pulverized coal into the furnace 1001 in time, so that the pulverized coal can be fully burned, avoiding the pulverized coal from accumulating at the coal feeding port 30. In other embodiments, if the original circulating fluidized bed boiler is to be retrofitted, for the convenience of installation, the coal-feeding air duct 2 can be set as a bent pipe to avoid other structural members. At the same time, the outlet end of the coal-feeding air duct 2 can be appropriately bent to avoid the water-cooled wall, preventing the water-cooled wall pipe from interfering with the coal-feeding air duct 2. However, it is necessary to ensure that the second included angle between the coal-feeding air discharged from the coal-feeding air duct 2 and the horizontal direction is between 0° and 10°, so that the coal-feeding air blows the pulverized coal horizontally or obliquely downward to the lower part of the furnace 1001, enabling the pulverized coal to fully burn inside the furnace 1001.

[0033] The coal feeding pipe 1 in this embodiment is a rectangular pipe. The bottom surface of the coal feeding port 30 is the coal feeding outlet surface, and the included angle between the coal feeding outlet surface and the lower bottom plate of the rectangular pipe is the third included angle, and the third included angle is between 170° and 180°. That is, the flowing direction of the pulverized coal when it enters the furnace 1001 through the coal feeding port 30 is slightly upward inclined compared with the flowing direction when it directly enters the furnace 1001 from the coal feeding pipe 1, which is convenient for the uniform spreading of the pulverized coal.

[0034] In order to reduce the probability of the coal-feeding air duct 2 being worn by pulverized coal, it is required that the thickness of the wear-resistant and refractory member 3 between the coal-feeding air duct 2 and the coal feeding pipe 1 is not less than 50 mm. At the same time, a turtleback net (not shown in the figure) is provided between the coal-feeding air duct 2 and the coal feeding pipe 1. The turtleback net is fixedly arranged on the furnace body 100, and the wear-resistant and refractory member 3 is filled in the turtleback net. The turtleback net in this embodiment is composed of heat-resistant and wear-resistant steel sheets, and the thickness of the steel sheets is not less than 5 mm. The turtleback net can not only further prevent the probability of the pulverized coal from wearing the coal-feeding air duct 2 and the water-cooled wall, but also play a role in fixing the wear-resistant and refractory member 3.

[0035] As Figure 1 and Figure 2 shown, the coal feeding and spreading device of the circulating fluidized bed boiler in this embodiment further includes a refractory component 5. The refractory component 5 includes a sealing box 51 and a heat insulation member 52. The sealing box 51 is fixedly arranged on the furnace body 100 and defines a chamber therein. The heat insulation member 52 is filled in the chamber. One end of the wear-resistant refractory member 3 is located in the chamber, and the other end extends out of the sealing box 51 and extends into the furnace chamber 1001.

[0036] As Figure 1 and Figure 3 shown, the coal conveying air duct 2 in this embodiment includes a coal conveying air connection pipe 21 and twelve coal conveying air branch pipes 22. The outlet of the coal conveying air connection pipe 21 is simultaneously communicated with the twelve coal conveying air branch pipes 22. The twelve coal conveying air branch pipes 22 are arranged side by side, and the outlet of each coal conveying air branch pipe 22 is communicated with the furnace chamber 1001. The coal conveying air branch pipe 22 in this embodiment is a stainless steel round pipe made of 06Cr25Ni20, that is, the outlet of the coal conveying air branch pipe 22 is a circular opening. Specifically, the coal conveying air connection pipe 21 in this embodiment includes a coal conveying air main pipe 211 and a coal conveying air distribution pipe 212. The coal conveying air main pipe 211 is connected to the coal conveying air distribution pipe 212, and several coal conveying air branch pipes 22 are all connected to the coal conveying air distribution pipe 212. The inlet of the coal conveying air connection pipe 21 in this embodiment is communicated with the coal feeding air duct 200, the primary air duct, the fluidizing air duct, the recirculation flue gas duct or the outlet of the fan. The primary air duct includes a hot primary air duct and a cold primary air duct, that is, the coal conveying air can be coal feeding air, hot primary air, cold primary air, fluidizing air, recirculation flue gas or provided separately by the fan. The coal conveying air is specifically selected according to the actual situation of the circulating fluidized bed boiler.

[0037] In other embodiments, the coal conveying air branch pipe 22 can also be a pipe with other cross-sectional shapes. The coal conveying air branch pipe 22 is not limited to the stainless steel round pipe made of 06Cr25Ni20 in this embodiment. The specific material can be selected according to actual needs. The number of the coal conveying air branch pipes 22 is not limited to twelve in this embodiment and can also be other numbers. When the number of the coal conveying air branch pipes 22 is one and the outlet of the coal conveying air branch pipe 22 is a rectangular opening, stiffening plates can be installed in the outlet of the coal conveying air branch pipe 22 at this time to divide the outlet of the coal conveying air branch pipe 22 into several small rectangular openings.

[0038] The coal spreading device of the circulating fluidized bed boiler of this embodiment also includes a connecting piece (not shown in the figure), which is sleeved on one end of each coal spreading air branch pipe 22 close to the furnace 1001. Specifically, the connecting piece is a connecting fin, and twelve avoidance holes are provided on the connecting fin. The twelve avoidance holes are arranged in a one-to-one correspondence with the twelve coal spreading air branch pipes 22, and each coal spreading air branch pipe 22 runs through an avoidance hole. The connecting piece can not only increase the firmness of the outlets of the twelve coal spreading air branch pipes 22, but also play a role in protecting the water-cooled wall and the coal feeding port 30. In other embodiments, the connecting piece and the coal spreading air branch pipe 22 can also be fixedly connected by welding technology, and the connection method of the connecting piece and the coal spreading air branch pipe 22 is selected according to actual needs.

[0039] Specifically, the coal powder discharged through the coal feeding port 30 will first flush the connecting plate, and only when the connecting plate is flushed and worn will it flush the wear-resistant refractory part 3 and the tortoise shell mesh, and only when the wear-resistant refractory part 3 is flushed and worn will it flush the coal-spreading air duct 2, and only when the outlet end of the coal-spreading air duct 2 is worn will it flush the water-cooled wall. It can be seen that the coal powder will only flush the water-cooled wall after all the above three guarantees are flushed and worn, reducing the probability of the water-cooled wall tube bursting due to flushing and wear.

[0040] Because the coal spreading device of the circulating fluidized bed boiler of this embodiment is located in the dense phase area at the lower part of the furnace body 100, it is necessary to consider the expansion problem of the coal spreading air duct 2. In order to solve the problem that the length of the coal spreading air duct 2 changes due to different temperatures, as shown in FIG. Figure 1 As shown, the coal spreading air duct 2 of this embodiment is provided with an expansion joint 6, which is arranged on the coal spreading air mother pipe 211. The expansion joint 6 is configured to be adjustable in length, and the expansion joint 6 is a metal hose, a metal expansion joint or a non-metal expansion joint.

[0041] This embodiment also provides a circulating fluidized bed boiler, such as Figure 1 As shown, the circulating fluidized bed boiler includes a furnace body 100, a coal supply air duct 200 and a coal supply and spreading device of the circulating fluidized bed boiler described in this embodiment. The furnace body 100 is provided with a wear-resistant and refractory part 3. The outlet of the coal supply air duct 200 is connected with the coal supply pipe 1. The coal supply air duct 200 is used to supply coal supply air to the coal supply pipe 1. The coal supply air duct 200 is connected with the coal spreading air duct 2.

[0042] The circulating fluidized bed boiler provided in this embodiment has the advantages that coal powder is not easily accumulated at the outlet of the coal feeding pipe 1, the temperature in the furnace 1001 is more uniform, the refractory material around the outlet end of the coal pipe is not easy to fall off, and the probability of leakage of the water-cooled wall tube is small.

[0043] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A coal feeding and spreading device for a circulating fluidized bed boiler, characterized in that, Comprising: A coal feeding pipe (1) for conveying pulverized coal to the furnace body (100); A coal spreading air pipe (2) arranged below the coal feeding pipe (1), and the coal spreading air blown out by the coal spreading air pipe (2) can blow the pulverized coal conveyed by the coal feeding pipe (1) into the furnace chamber (1001); A wear-resistant refractory member (3) protruding on the furnace body (100) and the wear-resistant refractory member (3) wraps the outlet of the coal feeding pipe (1) and the outlet of the coal spreading air pipe (2), the outlet end of the coal feeding pipe (1) is located inside the wear-resistant refractory member (3), and a coal feeding port (30) communicating with the coal feeding pipe (1) is provided on the wear-resistant refractory member (3); An air volume adjusting member (4), and the air volume adjusting member (4) is arranged on the coal spreading air pipe (2) to adjust the air volume of the coal spreading air blown out by the coal spreading air pipe (2); The pulverized coal discharged from the coal feeding port (30) flows horizontally or obliquely downward, the coal spreading air discharged from the outlet of the coal spreading air pipe (2) flows horizontally or obliquely downward, the included angle between the flowing direction of the pulverized coal and the horizontal direction is a first included angle, the included angle between the coal spreading air and the horizontal direction is a second included angle, and the second included angle is less than or equal to the first included angle; The coal feeding pipe (1) is a rectangular pipe, the bottom surface of the coal feeding port (30) is a coal feeding outlet surface, and the included angle between the coal feeding outlet surface and the lower bottom plate of the rectangular pipe is a third included angle, and the third included angle is between 170° and 180°; 2. The coal feeding and spreading device of the circulating fluidized bed boiler according to claim 1, characterized in that, The second included angle is between 0° and 10°; 3. The coal feeding and spreading device of the circulating fluidized bed boiler according to claim 1, characterized in that, A turtleback net is arranged between the coal spreading air pipe (2) and the coal feeding pipe (1), the turtleback net is fixedly arranged on the furnace body (100), and the wear-resistant refractory member (3) is filled in the turtleback net; 4. The coal feeding and spreading device of the circulating fluidized bed boiler according to claim 1, characterized in that, The coal feeding and spreading device of the circulating fluidized bed boiler further includes a refractory component (5), and the refractory component (5) includes a sealing box (51) and a heat preservation member (52), the sealing box (51) is fixedly arranged on the furnace body (100) and defines a chamber therein, the heat preservation member (52) is filled in the chamber, one end of the wear-resistant refractory member (3) is located in the chamber, and the other end extends out of the sealing box (51) and extends into the furnace chamber (1001); 5. The coal feeding and spreading device of the circulating fluidized bed boiler according to claim 1, characterized in that, The coal spreading air pipe (2) includes a coal spreading air connecting pipe (21) and a plurality of coal spreading air branch pipes (22), the inlet of the coal spreading air connecting pipe (21) is communicated with the outlet of a coal delivery air pipe (200), a primary air pipe, a fluidizing air pipe, a recirculating flue gas pipe or a fan, the outlet of the coal spreading air connecting pipe (21) is simultaneously communicated with the plurality of coal spreading air branch pipes (22), the plurality of coal spreading air branch pipes (22) are arranged side by side and the outlet of each coal spreading air branch pipe (22) is communicated with the furnace chamber (1001); 6. The coal feeding and spreading device of the circulating fluidized bed boiler according to claim 5, characterized in that The coal feeding and spreading device of the circulating fluidized bed boiler further includes a connecting piece, and the connecting piece is sleeved on one end of each coal spreading air branch pipe (22) close to the furnace chamber (1001); 7. The coal feeding and spreading device of the circulating fluidized bed boiler according to claim 1, characterized in that An expansion joint (6) is arranged on the coal spreading air pipe (2), and the expansion joint (6) is configured to have an adjustable length.

8. A circulating fluidized bed boiler, characterized in that, It includes a furnace body (100), a coal feeding air pipe (200), and a coal feeding and spreading device of a circulating fluidized bed boiler according to any one of claims 1-7. The wear-resistant refractory member (3) is provided on the furnace body (100). The outlet of the coal feeding air pipe (200) is communicated with the coal feeding pipe (1). The coal feeding air pipe (200) is used to supply coal feeding air to the coal feeding pipe (1), and the coal feeding air pipe (200) is communicated with the coal spreading air pipe (2).

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