Efficient boiler modified based on circulating fluidized bed boiler

Abstract

The utility model discloses an improved efficient boiler based on a circulating fluidized bed boiler, which belongs to the technical field of boilers and comprises a boiler body, a feeding pipe connected to one side wall of the boiler body, a circulating pipe connected to the other side wall of the boiler body and a smoke exhaust pipe fixedly welded to the top wall of the boiler body. Output shafts of the two first motors are coaxially connected with inner supporting shafts correspondingly, the two inner supporting shafts are fixedly sleeved with rollers correspondingly, a cross beam rod is welded to the position, below the two rollers, in an inner cavity of the feeding pipe, a second motor is installed on the cross beam rod, and the first motors and the second motor both need to be powered by external electric power facilities; and an output shaft of the second motor is coaxially connected with a grinding hammer. According to the improved efficient boiler based on the circulating fluidized bed boiler, after two times of smashing, fire coal can become very fine, air exhausted from a plurality of air outlets is matched to directly blow the fire coal from multiple angles, the combustion efficiency of the fire coal is higher, and waste of the fire coal is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of boilers, and in particular relates to a high-efficiency boiler based on the transformation of a circulating fluidized bed boiler. Background Art

[0002] The circulating fluidized bed boiler uses fluidized combustion, and its main structure includes two parts: the combustion chamber (including the dense phase area and the dilute phase area) and the circulating furnace (including the high-temperature gas-solid separator and the return system). The technology used by the circulating fluidized bed boiler is the most industrialized clean coal combustion technology. The biggest difference between it and the bubbling fluidized bed combustion technology is that the operating wind speed is high, which strengthens the heterogeneous reaction processes such as combustion and desulfurization. The boiler capacity can be expanded to a large capacity acceptable to the power industry (600MW or above).

[0003] In the process of realizing the utility model, the inventors found that there are at least the following problems in this technology: At present, most boilers using circulating fluidized bed technology do not crush the coal thoroughly enough (simply using a crushing knife or a roller for squeezing), resulting in a large volume of some coal. In addition, the air in the boiler usually enters the furnace body from only one input point, which causes some coal to not burn fully and waste coal.

[0004] To this end, we proposed a high-efficiency boiler based on the transformation of circulating fluidized bed boiler to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a high-efficiency boiler based on the transformation of a circulating fluidized bed boiler. After two crushings, the coal will become very finely crushed, and the air discharged from multiple air outlets will blow directly at the coal from multiple angles, making the coal combustion efficiency higher and reducing coal waste, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A high-efficiency boiler based on the transformation of a circulating fluidized bed boiler comprises a furnace body, a feeding pipe connected to one side wall of the furnace body, a circulation pipe connected to the other side wall of the furnace body, and a smoke exhaust pipe fixedly welded to the top wall of the furnace body, a first motor is symmetrically installed on one side wall of the feeding pipe, the output shafts of the two first motors are coaxially connected to inner support shafts, and rollers are fixedly sleeved on the two inner support shafts;

[0008] A crossbeam is welded below the two rollers in the inner cavity of the feeding tube, and a second motor is installed on the crossbeam. Both the first motor and the second motor need to be powered by external power facilities, wherein the output shaft of the second motor is coaxially connected with a grinding hammer, and a crushing seat is welded outside the grinding hammer in the inner cavity of the feeding tube, wherein the grinding hammer is truncated, and an annular grinding gap groove is formed between the grinding hammer and the crushing seat, and the spacing of the grinding gap groove decreases from top to bottom;

[0009] A blower is installed at the bottom of the side wall of the furnace body where the base is located, and an air inlet pipe is connected to the blower, wherein the air inlet pipe penetrates into the inner cavity of the furnace body and is welded to the furnace body, and an annular air pipe is welded to the bottom of the inner cavity of the furnace body, the inner cavity of the annular air pipe is designed to be annular, the air inlet pipe is communicated with the annular air pipe, and a plurality of air outlets are arranged on the inner side of the annular air pipe.

[0010] As a preferred embodiment, the two inner support shafts are horizontally arranged in the feeding pipe at the same height, and both ends of the inner support shafts are rotatably connected to the feeding pipe; so that the inner support shafts can operate stably under the drive of the first motor.

[0011] As a preferred embodiment, a base is welded to the bottom wall of the furnace body, and an ignition tube is also installed on the furnace body; a closing plate is inserted into the ignition tube in the vertical direction to close the ignition tube.

[0012] As a preferred embodiment, a protective cover is welded on the crossbeam, and the second motor is located in the inner cavity of the protective cover, so that the second motor can be protected by the protective cover.

[0013] As a preferred embodiment, the bottom of the feeding pipe is bent downward at an angle of 45 degrees and extends into the center of the furnace cavity; thereby facilitating the release of the crushed coal into the center of the furnace cavity.

[0014] As a preferred embodiment, multiple air outlets are distributed in a circular array on the inner side of the annular air pipe; thereby, the multiple air outlets can release air together and blow the air to various positions inside the annular air pipe, so that the coal inside the annular air pipe can burn more fully.

[0015] In summary, the technical effects and advantages of the utility model are as follows:

[0016] This high-efficiency boiler, which is based on the transformation of a circulating fluidized bed boiler, crushes the coal once through the two drums rotating in opposite directions, and then grinds and crushes the coal for a second time through the cooperation of a grinding hammer and a crushing seat. After two crushings, the coal becomes very finely crushed, and the air discharged from multiple air outlets blows directly at the coal from multiple angles, making the coal combustion more efficient and reducing coal waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a partial cross-sectional view of the utility model;

[0019] Figure 3 For this utility model Figure 2 A magnified view of the structure at center;

[0020] Figure 4 For this utility model Figure 2 Enlarged view of the structure at point B in the middle.

[0021] In the figure: 1. furnace body; 2. base; 3. feeding pipe; 4. circulation pipe; 5. exhaust pipe; 6. ignition pipe; 7. first motor; 8. inner support shaft; 9. roller; 10. crossbeam; 11. second motor; 12. protective cover; 13. grinding hammer; 14. crushing seat; 15. grinding gap groove; 16. blower; 17. air inlet pipe; 18. annular air pipe; 19. air outlet. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-Figure 4 , a high-efficiency boiler based on the transformation of a circulating fluidized bed boiler, comprising a furnace body 1, a feeding pipe 3 connected to one side wall of the furnace body 1, a circulation pipe 4 connected to the other side wall of the furnace body 1, and a smoke exhaust pipe 5 fixedly welded to the top wall of the furnace body 1, a base 2 is welded to the bottom wall of the furnace body 1, an ignition tube 6 is also installed on the furnace body 1, a closing plate is inserted in the vertical direction on the ignition tube 6, and is used to close the ignition tube 6, the bottom of the feeding pipe 3 is tilted 45 degrees and bent downward and extends into the center of the inner cavity of the furnace body 1, so as to facilitate the release of the crushed coal into the center of the inner cavity of the furnace body 1;

[0024] A first motor 7 is symmetrically mounted on one side wall of the feeding pipe 3, and the output shafts of the two first motors 7 are coaxially connected to inner support shafts 8, and the two inner support shafts 8 are horizontally arranged in the feeding pipe 3 and have the same height, and both ends of the inner support shafts 8 are rotatably connected to the feeding pipe 3, so that the inner support shafts 8 can stably operate under the drive of the first motor 7, and rollers 9 are fixedly sleeved on the two inner support shafts 8;

[0025] A crossbeam 10 is welded below the two rollers 9 in the inner cavity of the feeding tube 3, a second motor 11 is mounted on the crossbeam 10, a protective cover 12 is welded on the crossbeam 10, and the second motor 11 is located in the inner cavity of the protective cover 12, so that the second motor 11 can be protected by the protective cover 12, the first motor 7 and the second motor 11 both need to be powered by external power facilities, wherein the output shaft of the second motor 11 is coaxially connected with a grinding hammer 13, a crushing seat 14 is welded outside the grinding hammer 13 in the inner cavity of the feeding tube 3, wherein the grinding hammer 13 is truncated, and an annular grinding gap groove 15 is formed between the grinding hammer 13 and the crushing seat 14, and the spacing of the grinding gap groove 15 decreases from top to bottom;

[0026] A blower 16 is installed at the bottom of the side wall of the furnace body 1 where the base 2 is located, and an air inlet pipe 17 is connected to the blower 16, wherein the air inlet pipe 17 penetrates into the inner cavity of the furnace body 1 and is welded to the furnace body 1, and an annular air pipe 18 is welded at the bottom of the inner cavity of the furnace body 1, and the inner cavity of the annular air pipe 18 is annular in design, and the air inlet pipe 17 is communicated with the annular air pipe 18, and a plurality of air outlets 19 are provided on the inner side of the annular air pipe 18, and the plurality of air outlets 19 are distributed in a circular array on the inner side of the annular air pipe 18, so that the plurality of air outlets 19 can release air together, and blow the air to various positions inside the annular air pipe 18, so that the coal located inside the annular air pipe 18 can burn more fully.

[0027] The high-efficiency boiler based on the transformation of the circulating fluidized bed boiler: when in use, first drive the second motor 11 and the two first motors 7 to operate, wherein the two first motors 7 rotate in opposite directions, and when the two first motors 7 operate, drive the two inner support shafts 8 and the rollers 9 thereon to operate, so that the two rollers 9 rotate in opposite directions, add coal from the top of the feeding pipe 3, and the coal falls between the two rollers 9 to be crushed once, and then the coal falls and falls on the inner side of the grinding gap groove 15, and the operation of the second motor 11 drives the grinding hammer 13 to operate, and while the grinding hammer 13 is operating, the grinding gap groove 15 can be used to grind and crush the coal for a second time, because the grinding gap groove 15 is used for grinding and crushing, and the grinding gap groove 15 is used for grinding and crushing. The spacing between the slots 15 decreases from top to bottom, so the coal can be ground into very fine pieces, and finally the coal falls at the center of the inner cavity of the furnace body 1 (the inner side of the annular air pipe 18); the fire source is sent into the inner cavity of the furnace body 1 through the ignition pipe 6 and the coal is ignited, and then the closing plate closes the ignition pipe 6, and the blower 16 is driven to run to send the outside air into the annular air pipe 18 through the air inlet pipe 17. After the air is dispersed in the annular inner cavity of the annular air pipe 18, it is blown out from multiple air outlets 19 and blown toward the coal from multiple directions, so that the coal receives air more fully and burns more fully; the smoke during combustion is discharged from the exhaust pipe 5; in addition, the technical principle of the boiler is the existing technology.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-efficiency boiler based on the transformation of a circulating fluidized bed boiler, comprising a furnace body (1), a feeding pipe (3) connected to one side wall of the furnace body (1), a circulation pipe (4) connected to the other side wall of the furnace body (1), and a smoke exhaust pipe (5) fixedly welded to the top wall of the furnace body (1), characterized in that: A first motor (7) is symmetrically mounted on one side wall of the feeding pipe (3); the output shafts of the two first motors (7) are coaxially connected to inner support shafts (8), and rollers (9) are fixedly sleeved on the two inner support shafts (8); A crossbeam (10) is welded in the inner cavity of the feeding tube (3) below the two rollers (9), a second motor (11) is mounted on the crossbeam (10), an output shaft of the second motor (11) is coaxially connected to a grinding hammer (13), a crushing seat (14) is welded in the inner cavity of the feeding tube (3) outside the grinding hammer (13), wherein the grinding hammer (13) is truncated, an annular grinding gap groove (15) is formed between the grinding hammer (13) and the crushing seat (14), and the spacing of the grinding gap groove (15) decreases from top to bottom; The furnace body (1) is provided with a blower (16) at the bottom of a side wall where the base (2) is located, and the blower (16) is connected to an air inlet pipe (17), wherein the air inlet pipe (17) penetrates into the inner cavity of the furnace body (1) and is welded to the furnace body (1), and an annular air pipe (18) is welded to the bottom of the inner cavity of the furnace body (1), the air inlet pipe (17) is in communication with the annular air pipe (18), and a plurality of air outlets (19) are provided on the inner side of the annular air pipe (18).

2. A high-efficiency boiler based on circulating fluidized bed boiler transformation according to claim 1, characterized in that: The two inner support shafts (8) are both horizontally arranged in the feeding pipe (3) and have the same height, and both ends of the inner support shaft (8) are rotatably connected to the feeding pipe (3).

3. A high-efficiency boiler based on circulating fluidized bed boiler transformation according to claim 1, characterized in that: A base (2) is welded to the bottom wall of the furnace body (1), and an ignition tube (6) is also installed on the furnace body (1).

4. A high-efficiency boiler based on circulating fluidized bed boiler transformation according to claim 1, characterized in that: A protective cover (12) is welded to the crossbeam (10), and the second motor (11) is located in the inner cavity of the protective cover (12).

5. The high-efficiency boiler based on the transformation of a circulating fluidized bed boiler according to claim 1, characterized in that: The bottom of the feeding pipe (3) is bent downward at an angle of 45° and extends into the center of the inner cavity of the furnace body (1).

6. The high-efficiency boiler based on the transformation of a circulating fluidized bed boiler according to claim 1, characterized in that: The plurality of air outlets (19) are distributed in a circular array on the inner side of the annular air pipe (18).

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