CN214700660U - Coal feeding and broadcasting device of circulating fluidized bed boiler and circulating fluidized bed boiler - Google Patents

Abstract

The utility model relates to a circulating fluidized bed boiler technical field discloses a coal feeding broadcasting device and circulating fluidized bed boiler of circulating fluidized bed boiler. Wherein the coal feeding broadcasting device of the circulating fluidized bed boiler comprises: a coal supply pipe; the coal-spreading air pipe is arranged below the coal-feeding pipe, and the coal-spreading air blown by the coal-spreading air pipe can blow the pulverized coal conveyed by the coal-feeding pipe into the hearth; the wear-resistant and fire-resistant part is convexly arranged on the furnace body and wraps the outlet of the coal feeding pipe and the outlet of the coal sowing air pipe, the outlet end of the coal feeding pipe is positioned inside the wear-resistant and fire-resistant part, and the wear-resistant and fire-resistant part is provided with a coal feeding port communicated with the coal feeding pipe; and the air quantity adjusting piece is arranged on the coal sowing air pipe to adjust the air quantity of the coal sowing air blown out by the coal sowing air pipe. The utility model discloses a coal feeding broadcasting device of circulating fluidized bed boiler has solved the exit end of coal feeding pipe and has taken place deformation, fracture and wearing and tearing scheduling problem easily, has avoided the emergence of phenomena such as the peripheral refractory material of exit end of coal feeding pipe drops, the water wall pipe reveals simultaneously.

Description

Coal feeding and broadcasting device of circulating fluidized bed boiler and circulating fluidized bed boiler

Technical Field

The utility model relates to a circulating fluidized bed boiler technical field especially relates to a coal feeding broadcasting device and circulating fluidized bed boiler of circulating fluidized bed boiler.

Background

Most of the existing large-capacity circulating fluidized bed boilers adopt a front wall to feed coal through a coal feeding pipe, the coal feeding pipe is usually formed by processing stainless steel plates or cast steel, the outlet end of the coal feeding pipe is positioned in a dense-phase region of a hearth, the temperature of the hearth is generally 850-950 ℃ when the boiler normally operates, and the outlet end of the coal feeding pipe is lower than an air distribution plate in height, so that the outlet end of the coal feeding pipe close to the front wall cannot effectively broadcast coal powder, the coal powder cannot effectively reach the inside of the hearth, and the temperature inside the hearth is uneven. Due to the fact that the concentration of the pulverized coal near the outlet end of the coal feeding pipe of the front wall is high, the temperature near the outlet end of the coal feeding pipe is high. Under the environment, the outlet end of the coal supply pipe is radiated by high temperature for a long time, and the coal supply pipe is influenced by cold-heat exchange alternative stress for a long time by combining the hearth temperature change caused by the load change of the unit and the scouring of high-temperature flue gas of the hearth, so that the material performance strength of the coal supply pipe is reduced, the wear resistance is reduced, and the coal supply pipe is more easily worn by pulverized coal. Along with the increase of the unit capacity, the cross-sectional area of the outlet end of the coal supply pipe is correspondingly increased, the rigidity of the coal supply pipe is poor, and finally the outlet end of the coal supply pipe is easy to deform, crack, wear and the like, so that derived problems such as the falling of refractory materials at the periphery of the outlet end of the coal supply pipe, the leakage of a water wall pipe and the like are caused, and the long-term stable operation of the boiler is seriously influenced.

In order to improve the coal feeding broadcasting capability, the prior art provides coal feeding air for the coal feeding pipe by adding the coal feeding air pipe, the flow direction of the coal feeding air pipe is consistent with that of the coal powder in the coal feeding pipe, and the added coal feeding air pipe cannot effectively feed the coal powder into a hearth, so that the problems that the outlet end of the coal feeding pipe is easy to deform, crack, wear and the like cannot be solved.

SUMMERY OF THE UTILITY MODEL

Based on above, an object of the utility model is to provide a coal feeding broadcasting device and circulating fluidized bed boiler of circulating fluidized bed boiler, the exit end of having solved the coal feeding pipe that prior art exists takes place deformation, fracture and wearing and tearing scheduling problem easily, has avoided the peripheral refractory material of exit end of coal feeding pipe to drop simultaneously, the emergence of phenomenons such as water wall pipe reveals.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a coal feed spreading device for a circulating fluidized bed boiler, comprising: the coal feeding pipe is used for conveying coal powder to the furnace body; the coal-spreading air pipe is arranged below the coal-feeding pipe, and the coal-spreading air blown by the coal-spreading air pipe can blow the pulverized coal conveyed by the coal-feeding pipe into the hearth; the wear-resistant and fire-resistant part is convexly arranged on the furnace body and wraps the outlet of the coal feeding pipe and the outlet of the coal sowing air pipe, the outlet end of the coal feeding pipe is positioned inside the wear-resistant and fire-resistant part, and a coal feeding port communicated with the coal feeding pipe is arranged on the wear-resistant and fire-resistant part; the air quantity adjusting piece is arranged on the coal-sowing air pipe to adjust the air quantity of the coal-sowing air blown out by the coal-sowing air pipe.

As a preferred scheme of the coal feeding broadcasting device of the circulating fluidized bed boiler, the pulverized coal discharged from the coal feeding port flows downwards along the horizontal direction or obliquely, the coal-spreading air discharged from the outlet of the coal-spreading air pipe flows downwards along the horizontal direction or obliquely, the included angle between the flow 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 smaller than or equal to the first included angle.

As a preferable embodiment of the coal feeding spreading device of the circulating fluidized bed boiler, the second included angle is between 0 ° and 10 °.

As a preferred scheme of the coal feeding broadcasting device of the 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, an included angle between the coal feeding outlet surface and a lower bottom plate of the rectangular pipe is a third included angle, and the third included angle is 170-180 degrees.

As a preferable scheme of the coal feeding broadcasting device of the circulating fluidized bed boiler, a tortoise-shell net is arranged between the coal feeding air pipe and the coal feeding pipe, the tortoise-shell net is fixedly arranged on the boiler body, and the wear-resistant and fire-resistant piece is filled in the tortoise-shell net.

As an optimal selection scheme of the coal feeding broadcasting device of the circulating fluidized bed boiler, the coal feeding broadcasting device of the circulating fluidized bed boiler further comprises a fire-resistant component, the fire-resistant component comprises a sealing box and a heat preservation part, the sealing box is fixedly arranged on the boiler body and limits a cavity in the boiler body, the heat preservation part is filled in the cavity, one end of the wear-resistant fire-resistant part is located in the cavity, and the other end of the wear-resistant fire-resistant part extends out of the sealing box and extends into the hearth.

As an optimal scheme of a coal feeding broadcast sowing device of a circulating fluidized bed boiler, a coal sowing air pipe comprises a coal sowing air connecting pipe and a plurality of coal sowing air branch pipes, the inlet of the coal sowing air connecting pipe is communicated with the outlets of a coal feeding air pipe, a primary air pipe, a fluidized air pipe, a recirculating flue gas pipe or a fan, the outlets of the coal sowing air connecting pipe are communicated with the coal sowing air branch pipes simultaneously, the coal sowing air branch pipes are distributed side by side, and the outlets of the coal sowing air branch pipes are communicated with a hearth.

As an optimal scheme of the coal feeding broadcasting device of the circulating fluidized bed boiler, the coal feeding broadcasting device of the circulating fluidized bed boiler further comprises a connecting sheet, and the connecting sheet is sleeved at one end, close to the hearth, of each coal feeding air branch pipe.

As a preferable scheme of the coal feeding broadcasting device of the circulating fluidized bed boiler, an expansion joint is arranged on the coal broadcasting air pipe, and the expansion joint is configured to be adjustable in length.

The utility model provides a circulating fluidized bed boiler, includes stove body, send coal tuber pipe and above arbitrary scheme circulating fluidized bed boiler's coal feeding broadcast sowing device, be equipped with on the stove body wear-resisting fire-resistant spare, send the export of coal tuber pipe with coal feeding pipe intercommunication, send the coal tuber pipe be used for coal feeding pipe supplies with and sends the coal wind, send the coal tuber pipe with coal feeding tuber pipe intercommunication.

The utility model has the advantages that: the utility model discloses a coal feeding broadcasting device of circulating fluidized bed boiler, the coal feeding air that the coal feeding tuber pipe of addding blew out can blow in the furnace with the buggy that the coal feeding pipe was carried, the probability of the export of coal feeding pipe is piled up to the buggy has been reduced, the wear-resisting fire-resistant spare of addding can reduce the buggy and directly erode near the water-cooling wall of coal feeding pipe or the peripheral refractory material of exit end of coal feeding pipe, the probability that the peripheral refractory material of exit end of coal feeding pipe drops and the water-cooling wall pipe is revealed has been reduced, make circulating fluidized bed boiler can the safe operation, the amount of wind regulating part of the volume of addding can be transferred according to the actual operating condition warping coal feeding tuber pipe and get into the amount of wind of the coal feeding of furnace, so that the buggy that the coal feeding pipe is discharged is blown to suitable position.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic view of a coal feed spreading device of a circulating fluidized bed boiler according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a coal feeding duct diagram of a coal feeding and spreading device of a circulating fluidized bed boiler according to an embodiment of the present invention.

In the figure:

1. a coal supply pipe; 2. a coal-seeding air pipe; 21. a coal-spreading wind connecting pipe; 211. a coal-spreading air main pipe; 212. a coal-spreading air distribution pipe; 22. a coal-spreading air branch pipe; 3. a wear resistant refractory component; 30. a coal feeding port; 4. an air volume adjusting part; 5. a refractory component; 51. a sealing box; 52. a heat preservation member; 6. an expansion joint;

100. a furnace body; 1001. a hearth; 200. a coal feeding air pipe.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

This embodiment provides a coal feeding spreading device of a circulating fluidized bed boiler, as shown in figures 1 to 3, this coal feeding broadcasting device of circulating fluidized bed boiler sets up in the lower part of stove body 100 and including coal feeding pipe 1, coal feeding tuber pipe 2, wear-resisting fire-resistant 3 and air regulation piece 4, coal feeding pipe 1 is used for carrying the buggy for stove body 100, coal feeding tuber pipe 2 sets up the below at coal feeding pipe 1, the coal feeding wind that coal feeding tuber pipe 2 blew out can be with the buggy that coal feeding pipe 1 carried in blowing furnace 1001, wear-resisting fire-resistant 3 protruding establishes on stove body 100 and wear-resisting fire-resistant 3 parcel coal feeding pipe 1's export and the export of coal feeding tuber pipe 2, the exit end of coal feeding pipe 1 is located wear-resisting fire-resistant 3's inside, be equipped with the coal feeding mouth 30 with coal feeding pipe 1 intercommunication on wear-resisting fire-resistant 3, air regulation piece 4 sets up the amount of wind in order to adjust the coal feeding wind's that coal feeding tuber pipe 2 blew out the amount of wind on coal feeding tuber pipe 2.

It should be noted that the air volume adjusting member 4 of the present embodiment may be an air volume adjusting valve for adjusting the air volume, and the air volume adjusting valve may be a manual air volume adjusting valve or an electric air volume adjusting valve for adjusting the air volume of the coal-seeding air entering the furnace 1001 through the coal-seeding air duct 2 in a unit time.

The wear-resistant and fire-resistant member 3 of the embodiment is made of a material with wear-resistant and fire-resistant characteristics, and because the wear-resistant and fire-resistant member 3 is convexly arranged on the furnace body 100, the pulverized coal input into the hearth 1001 through the coal supply pipe 1 can firstly scour the wear-resistant and fire-resistant member 3, and cannot directly scour the water wall, so that the probability of damage to the water wall pipe is reduced. The outlet of the coal feeding pipe 1 is arranged inside the wear-resistant and fire-resistant part 3, the influence of high-temperature radiation on the outlet end of the coal feeding pipe 1 is reduced, meanwhile, the outlet end of the coal feeding pipe 1 cannot be washed by high-temperature smoke inside the hearth 1001, the temperature of the outlet end of the coal feeding pipe 1 is reduced, the material performance strength and the wear resistance of the coal feeding pipe 1 are improved, the probability that the outlet end of the coal feeding pipe 1 deforms, cracks and is worn out is reduced, and the circulating fluidized bed boiler can stably operate.

The coal feeding broadcasting device of the circulating fluidized bed boiler provided by the embodiment, the coal feeding air blown by the added coal feeding air pipe 2 can blow the coal powder conveyed by the coal feeding pipe 1 into the hearth 1001, the probability that the coal powder is accumulated at the outlet of the coal feeding pipe 1 is reduced, the added wear-resistant fire-resistant piece 3 can reduce the possibility that the coal powder directly erodes the water wall near the coal feeding pipe 1 or the fire-resistant material at the periphery of the outlet end of the coal feeding pipe 1, the probability that the fire-resistant material at the periphery of the outlet end of the coal feeding pipe drops and the water wall pipe leaks is reduced, so that the circulating fluidized bed boiler can safely operate, the added air volume adjusting piece 4 can adjust the air volume of the coal feeding air entering the hearth 1001 through the coal feeding air pipe 2 according to the actual operation condition, and the coal powder discharged from the coal feeding pipe 1 is blown to a proper position.

As shown in fig. 2, the outlet end of the coal-feeding duct 2 of this embodiment is flush with the end of the wear-resistant fire-resistant component 3 extending into the furnace 1001, and the outlet end of the coal-feeding duct 2 needs to be flushed and roasted against the high-temperature pulverized coal in the furnace 1001, so that the coal-feeding duct 2 needs to be made of heat-resistant and wear-resistant steel to increase the wear resistance of the coal-feeding duct 2. The pulverized coal discharged from the coal feeding port 30 flows downwards along the horizontal direction or obliquely, the coal-spreading air discharged from the outlet of the coal-spreading air pipe 2 flows downwards along the horizontal direction or obliquely, the included angle between the flow 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, the second included angle is smaller than or equal to the first included angle, and the second included angle is between 0 and 10 degrees, so that the pulverized coal discharged from the coal feeding port 30 can be perpendicular to the center of the cross section of the furnace body 100 by the coal-spreading air, and the uniformity of the temperature inside the hearth 100 is improved.

The pulverized coal discharged from the coal feeding port 30 is inclined downwards along the horizontal direction or slightly, so that the pulverized coal in the coal feeding pipe 1 can smoothly enter the hearth 1001, the pulverized coal is prevented from being blocked in the coal feeding pipe 1, the second included angle is smaller than or equal to the first included angle, the pulverized coal can be blown to the hearth 1001 by the coal-blowing air blown out from the coal-blowing air pipe 2, the pulverized coal is fully combusted, and the pulverized coal is prevented from being accumulated at the coal feeding port 30. In other embodiments, if the original circulating fluidized bed boiler is modified, in order to facilitate installation, the coal-feeding air pipe 2 may be set as a bent pipe to avoid other structural members, and meanwhile, the outlet end of the coal-feeding air pipe 2 may be properly bent to avoid a water-cooled wall, so as to prevent the water-cooled wall pipe from interfering with the coal-feeding air pipe 2, but it is required to ensure that a second included angle between the coal-feeding air discharged through the coal-feeding air pipe 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, so that the pulverized coal is fully combusted inside the furnace 1001.

The coal supply pipe 1 of the embodiment is a rectangular pipe, the bottom surface of the coal supply port 30 is a coal supply outlet surface, an included angle between the coal supply outlet surface and a lower bottom plate of the rectangular pipe is a third included angle, and the third included angle is 170-180 degrees. That is, the flow direction of the pulverized coal entering the furnace 1001 through the coal feeding port 30 is slightly inclined upward compared with the flow direction of the pulverized coal directly entering the furnace 1001 from the coal feeding pipe 1, so that the pulverized coal can be uniformly spread.

In order to reduce the probability that the coal-feeding air pipe 2 is abraded by the pulverized coal, the thickness of the wear-resistant fire-resistant part 3 between the coal-feeding air pipe 2 and the coal-feeding pipe 1 is required to be not less than 50mm, meanwhile, a tortoise-shell net (not shown in the figure) is arranged between the coal-feeding air pipe 2 and the coal-feeding pipe 1, the tortoise-shell net is fixedly arranged on the furnace body 100, and the wear-resistant fire-resistant part 3 is filled in the tortoise-shell net. The tortoise shell net of this embodiment comprises heat-resisting wear-resisting steel sheet, and the thickness of steel sheet is not less than 5mm, and tortoise shell net not only can further prevent the probability of buggy wearing and tearing coal-seeding tuber pipe 2 and water-cooling wall, can also play the effect of fixed wear-resisting refractory part 3.

As shown in fig. 1 and 2, the coal feeding spreading device of the circulating fluidized bed boiler of the present embodiment further includes a refractory assembly 5, the refractory assembly 5 includes a sealing box 51 and a heat insulating member 52, the sealing box 51 is fixedly disposed on the furnace body 100 and defines a chamber therein, the heat insulating 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 of the wear-resistant refractory member extends out of the sealing box 51 and into the furnace 1001.

As shown in fig. 1 and fig. 3, the coal feeding duct 2 of this embodiment includes a coal feeding duct connecting duct 21 and twelve coal feeding duct branch ducts 22, an outlet of the coal feeding duct connecting duct 21 is simultaneously communicated with the twelve coal feeding duct branch ducts 22, the twelve coal feeding duct branch ducts 22 are distributed side by side, an outlet of each coal feeding duct branch duct 22 is communicated with the furnace 1001, the coal feeding duct branch ducts 22 of this embodiment are stainless steel round ducts made of 06Cr25Ni20, that is, outlets of the coal feeding duct branch ducts 22 are circular openings. Specifically, the coal feeding air connecting pipe 21 of the present embodiment includes a coal feeding air main pipe 211 and a coal feeding air distribution pipe 212, the coal feeding air main pipe 211 is connected to the coal feeding air distribution pipe 212, and the plurality of coal feeding air branch pipes 22 are connected to the coal feeding air distribution pipe 212. The coal-seeding air connecting pipe 21 of the embodiment has an inlet communicated with the outlets of the coal-feeding air pipe 200, the primary air pipe, the fluidized air pipe, the recycling flue gas pipe or the fan, the primary air pipe comprises a hot primary air pipe and a cold primary air pipe, namely, the coal-seeding air can be coal-feeding air, hot primary air, cold primary air, fluidized air and recycling flue gas or can be provided by the fan independently, and the coal-seeding air is specifically selected according to the actual condition of the circulating fluidized bed boiler.

In other embodiments, the coal feeding air branch pipes 22 may also be pipes with cross sections in other shapes, the coal feeding air branch pipes 22 are not limited to the stainless steel round pipe made of 06Cr25Ni20 in this embodiment, the specific material may be selected according to actual needs, and the number of the coal feeding air branch pipes 22 is not limited to twelve in this embodiment, but may also be other numbers. When the number of the coal-feeding air branch pipes 22 is one and the outlets of the coal-feeding air branch pipes 22 are rectangular openings, rib plates can be installed in the outlets of the coal-feeding air branch pipes 22 to divide the outlets of the coal-feeding air branch pipes 22 into a plurality of small rectangular openings.

The coal feeding spreading device of the circulating fluidized bed boiler of the present embodiment further includes a connecting piece (not shown in the figure), and the connecting piece is sleeved on one end of each coal feeding air branch pipe 22 close to the furnace 1001. Specifically, the connecting sheet is a connecting fin, twelve avoiding holes are formed in the connecting fin, the twelve avoiding holes and the twelve coal-feeding air branch pipes 22 are arranged in a one-to-one correspondence manner, and each coal-feeding air branch pipe 22 penetrates through one avoiding hole. The connecting sheet not only can increase the firmness of the outlets of the twelve coal-feeding air branch pipes 22, but also can play a role in protecting the water-cooled wall and the coal feeding port 30. In other embodiments, the connecting piece may be fixedly connected to the coal-feeding air branch pipe 22 by a welding process, and the connecting mode of the connecting piece to the coal-feeding air branch pipe 22 is specifically selected according to actual needs.

Specifically, the coal powder discharged through the coal supply port 30 firstly erodes the connecting piece, the wear-resistant fire-resistant piece 3 and the tortoise shell net can be eroded after the connecting piece is eroded and worn out, the coal-seeding air pipe 2 can be eroded after the wear-resistant fire-resistant piece 3 is eroded and worn out, the water wall can be eroded only after the outlet end of the coal-seeding air pipe 2 is worn out, therefore, the coal powder can be eroded to the water wall only after the triple guarantee is totally eroded and worn out, and the probability of pipe explosion caused by erosion and wear of the water wall pipe is reduced.

Because the coal feeding broadcast device of the circulating fluidized bed boiler of the present embodiment is located in the dense phase region at the lower portion of the boiler body 100, the expansion problem of the coal feeding air duct 2 needs to be considered, and in order to solve the problem that the length of the coal feeding air duct 2 changes due to different temperatures of the coal feeding air duct 2, as shown in fig. 1, an expansion joint 6 is arranged on the coal feeding air duct 2 of the present embodiment, the expansion joint 6 is arranged on the coal feeding air main 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.

The present embodiment further provides a circulating fluidized bed boiler, as shown in fig. 1, the circulating fluidized bed boiler includes a boiler body 100, a coal feeding duct 200 and the coal feeding broadcasting device of the circulating fluidized bed boiler according to the present embodiment, the boiler body 100 is provided with a wear-resistant fire-resistant member 3, an outlet of the coal feeding duct 200 is communicated with the coal feeding duct 1, the coal feeding duct 200 is used for supplying coal feeding air to the coal feeding duct 1, and the coal feeding duct 200 is communicated with the coal broadcasting duct 2.

The circulating fluidized bed boiler provided by the embodiment has the advantages that pulverized coal is not easy to accumulate at the outlet of the coal supply pipe 1, the temperature in the hearth 1001 is more uniform, the refractory material at the periphery of the outlet end of the coal pipe is not easy to fall off, and the leakage probability of the water wall pipe is small.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A coal feed spreading device for a circulating fluidized bed boiler, comprising:

the coal feeding pipe (1) is used for conveying coal powder to the furnace body (100);

the coal-spreading air pipe (2) is arranged below the coal-feeding pipe (1), and the coal-spreading air blown by the coal-spreading air pipe (2) can blow the coal powder conveyed by the coal-feeding pipe (1) into the hearth (1001);

the wear-resistant and fire-resistant part (3) is convexly arranged on the furnace body (100), the wear-resistant and fire-resistant part (3) wraps the outlet of the coal feeding pipe (1) and the outlet of the coal sowing air pipe (2), the outlet end of the coal feeding pipe (1) is positioned inside the wear-resistant and fire-resistant part (3), and a coal feeding port (30) communicated with the coal feeding pipe (1) is arranged on the wear-resistant and fire-resistant part (3);

the air quantity adjusting piece (4) is arranged on the coal sowing air pipe (2) to adjust the air quantity of the coal sowing air blown out of the coal sowing air pipe (2).

2. The coal feeding broadcasting device of the circulating fluidized bed boiler according to claim 1, wherein the pulverized coal discharged from the coal feeding port (30) flows in a horizontal direction or obliquely downward, the coal-feeding air discharged from the outlet of the coal-feeding air pipe (2) flows in a horizontal direction or obliquely downward, the included angle between the flow direction of the pulverized coal and the horizontal direction is a first included angle, the included angle between the coal-feeding air and the horizontal direction is a second included angle, and the second included angle is smaller than or equal to the first included angle.

3. The coal feed spreading device of the circulating fluidized bed boiler according to claim 2, wherein the second included angle is between 0 ° and 10 °.

4. The coal feeding spreading device of the circulating fluidized bed boiler according to claim 1, wherein 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 an included angle between the coal feeding outlet surface and a lower bottom plate of the rectangular pipe is a third included angle, and the third included angle is between 170 ° and 180 °.

5. The coal feeding broadcasting device of the circulating fluidized bed boiler according to claim 1, wherein a tortoise-shell net is arranged between the coal feeding air pipe (2) and the coal feeding pipe (1), the tortoise-shell net is fixedly arranged on the boiler body (100), and the wear-resistant and fire-resistant member (3) is filled in the tortoise-shell net.

6. The coal feeding device of the circulating fluidized bed boiler according to claim 1, further comprising a refractory assembly (5), wherein the refractory assembly (5) comprises a sealing box (51) and a heat insulating member (52), the sealing box (51) is fixedly arranged on the boiler body (100) and defines a chamber therein, the heat insulating member (52) is filled in the chamber, one end of the wear-resistant refractory member (3) is positioned in the chamber, and the other end of the wear-resistant refractory member extends out of the sealing box (51) and into the hearth (1001).

7. The coal feeding spreading device of the circulating fluidized bed boiler according to claim 1, wherein the coal feeding duct (2) comprises a coal feeding duct connecting pipe (21) and a plurality of coal feeding duct branch pipes (22), an inlet of the coal feeding duct connecting pipe (21) is communicated with an outlet of a coal feeding duct (200), a primary duct, a fluidized duct, a recirculation flue gas duct or a fan, an outlet of the coal feeding duct connecting pipe (21) is simultaneously communicated with the plurality of coal feeding duct branch pipes (22), the plurality of coal feeding duct branch pipes (22) are distributed side by side, and an outlet of each coal feeding duct branch pipe (22) is communicated with the furnace (1001).

8. The coal feeding spreading device of the circulating fluidized bed boiler according to claim 7, further comprising a connecting piece, wherein the connecting piece is sleeved at one end of each coal feeding air branch pipe (22) close to the hearth (1001).

9. The coal feed spreading device of the circulating fluidized bed boiler according to claim 1, wherein an expansion joint (6) is provided on the coal feed duct (2), the expansion joint (6) being configured to be adjustable in length.

10. A circulating fluidized bed boiler, characterized by comprising a boiler body (100), a coal feeding air pipe (200) and the coal feeding broadcasting device of the circulating fluidized bed boiler according to any one of claims 1 to 9, wherein the furnace body (100) is provided with the wear-resistant and fire-resistant member (3), 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 for supplying coal feeding air to the coal feeding pipe (1), and the coal feeding air pipe (200) is communicated with the coal feeding air pipe (2).

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