Multi-stage drying coal feeding device suitable for high-moisture fuel

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By setting a circular air supply gap on the coal drop -oriented pipe to the coal -to -coal device, and using the dry duct to send it to high temperature wind or low temperature, the source of high moisture fuel, the problem of the drying effect of no increase in equipment has been achieved. , Reduced costs and solved the problem of occupying land.

CN222392878UActive Publication Date: 2025-01-24DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP

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Patent Information

Application Number: CN202420272142.2
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-02-04
Publication Date: 2025-01-24
Estimated Expiration: 2034-02-04

AI Technical Summary

Technical Problem

High moisture fuels are likely to cause blockage in coal feeding devices, affecting the continuous operation of the boiler. The increase in pre-furnace drying equipment in the prior art will increase initial investment and operating costs, and the floor area is difficult to solve.

Method used

Design a multi-stage dry coal feeding device. By setting an annular air supply gap on the coal dropping inclined pipe, and sending high-temperature air source or low-temperature hot air source to the gap through the drying air duct, it not only serves as purge air to promote fuel flow, but also Dry the fuel.

Benefits of technology

Effectively avoid the problem of high moisture fuel in the coal -to -coal device. It does not need to increase the additional drying equipment, reduce investment and operating costs, and solve the problem of occupying the area.

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Abstract

The utility model discloses a multi-stage drying coal feeding device suitable for high moisture fuel, which comprises a coal receiving vertical pipe and a coal dropping inclined pipe, the coal dropping inclined pipe comprises an outer pipe body and inner pipe bodies which are sequentially overlapped, the inner pipe bodies comprise a first inner pipe body and a plurality of second inner pipe bodies, an annular air supply gap is formed between the first inner pipe body and the second inner pipe bodies and is fixed through a limiting block, the horn mouth section of one second inner pipe body extends to the position between the other second inner pipe body and the outer pipe body between every two adjacent second inner pipe bodies, and an annular air supply gap is formed between the two second inner pipe bodies and is fixed through a limiting block. A plurality of drying air pipes A are arranged on an outer pipe body of the coal falling inclined pipe, and each drying air pipe A corresponds to and communicates with the corresponding annular air supply gap. On the basis of the structure of the coal falling inclined pipe, a new air supply structure is introduced, so that the novel air supply structure can be used as blowing air to push fuel to normally flow in the coal feeding device, and high-temperature air can be adopted to dry the fuel in the coal feeding device.

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Description

Technical Field

[0001] The utility model belongs to the technical field of coal feeding, and in particular relates to a multi-stage drying coal feeding device suitable for high-moisture fuel. Background Art

[0002] One of the advantages of circulating fluidized bed boilers is that they have good fuel adaptability. Whether it is bituminous coal, lean coal, high-moisture lignite or even oil shale, they can all achieve efficient and stable combustion, which is unmatched by other combustion methods. However, in terms of actual operating projects, there is often a problem of clogging of the coal feeding device due to excessive moisture in the fuel, which poses a hidden danger to the continuous operation of the boiler. Although there is also a technical route for pre-furnace drying, the initial investment and operating costs will increase due to the need to add separate drying equipment and systems, and there may also be problems that cannot be solved by occupying land. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a multi-stage drying coal feeding device that is suitable for high-moisture fuel. On the basis of ensuring the structure of the coal dropping inclined pipe, a new air supply structure is introduced, which can be used as a purge air to promote the normal flow of fuel in the coal feeding device, and high-temperature air can also be used to dry the fuel in the coal feeding device.

[0004] The embodiments of the present invention are implemented by the following technical solutions:

[0005] A multi-stage drying coal feeding device suitable for high-moisture fuel comprises a coal receiving vertical pipe and a coal dropping inclined pipe, the coal receiving vertical pipe is connected with the top of the coal dropping inclined pipe, the bottom of the coal dropping inclined pipe is provided with a coal feeding port connected with a furnace, the coal receiving vertical pipe is provided with a coal spreading air duct, the coal dropping inclined pipe comprises an outer pipe body and inner pipe bodies stacked in sequence, the inner pipe body comprises a first inner pipe body and a plurality of second inner pipe bodies, the first inner pipe body is fixed to the top of the coal dropping inclined pipe, one end of the second inner pipe body is provided with a flared section fixed to the inner wall of the outer pipe body, the second inner pipe body adjacent to the first inner pipe body Two inner tube bodies, whose bell-mouth sections extend between the first inner tube body and the outer tube body, an annular air supply gap is provided between the first inner tube body and the second inner tube body and are fixed by a limit block, between two adjacent second inner tube bodies, the bell-mouth section of one second inner tube body extends between the other second inner tube body and the outer tube body, an annular air supply gap is provided between the two second inner tube bodies and are fixed by a limit block, the outer tube body of the coal dropping inclined tube is provided with a plurality of drying air ducts A, and a drying air duct A corresponds to and is connected to a annular air supply gap.

[0006] In one embodiment of the utility model, a cooling pipe is further provided between the coal dropping inclined pipe and the coal feeding port, and the cooling pipe is provided with a cooling air duct.

[0007] In one embodiment of the utility model, a drying air duct B is provided on the top of the coal dropping inclined pipe, and the drying air duct B is connected to the annular air supply gap between the first inner tube body and the second inner tube body.

[0008] In one embodiment of the present invention, the drying air duct A and the drying air duct B are connected to a high-temperature air source or a low-temperature hot air source.

[0009] In an embodiment of the present invention, the coal spreading air duct is connected to a low-temperature hot air source.

[0010] In an embodiment of the utility model, the coal spreading air duct is provided with a coal spreading air nozzle.

[0011] The technical solution of the utility model has at least the following advantages and beneficial effects:

[0012] The utility model sets an annular air supply gap on the coal dropping inclined pipe, and supplies a high-temperature air source or a low-temperature hot air source to the annular air supply gap through the drying air duct A and the drying air duct B, which can be used as a purge wind to promote the normal flow of fuel in the coal dropping inclined pipe and can also dry the fuel in the coal dropping inclined pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the multi-stage drying coal feeding device in the utility model;

[0015] Figure 2 It is a schematic diagram of the first inner tube body and the second inner tube body in the utility model being overlapped with each other;

[0016] Figure 3 It is a schematic diagram of two second inner tubes overlapping each other in the utility model;

[0017] Figure 4 It is a schematic diagram of the coal dropping inclined pipe in the utility model;

[0018] Figure 5 It is a schematic diagram of the coal spreading air duct and the coal spreading air nozzle in the coal connecting vertical pipe of the utility model;

[0019] Figure 6 It is a schematic diagram of the coal feeding port and the purge air nozzle in the utility model.

[0020] Icons: 1-coal connecting vertical pipe, 11-coal spreading air duct, 12-coal spreading air nozzle, 2-coal dropping inclined pipe, 21-outer tube body, 22-first inner tube body, 23-second inner tube body, 231-bell mouth section, 24-annular air supply gap, 31-drying air duct A, 32-drying air duct B, 4-cooling pipe, 41-cooling air duct, 5-coal feeding port, 51-purge air nozzle, 6-limit block. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present utility model, it should be noted that if the terms "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "configure", and "connect" 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 the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] Please refer to Figure 1-6 This embodiment provides a multi-stage drying coal feeding device suitable for high-moisture fuel such as raw coal, which includes a coal receiving vertical pipe 1 and a coal dropping inclined pipe 2. The top of the high-moisture fuel coal receiving vertical pipe 1 is the connection part between the boiler plant and external equipment such as the coal feeder. By setting a three-dimensional expansion joint, it can absorb expansion in three directions, so that the fuel can smoothly enter the device. The coal receiving vertical pipe 1 is provided with a coal spreading air duct 11. The bottom of the coal receiving vertical pipe 1 is connected with the top of the coal dropping inclined pipe 2. After the fuel enters the coal receiving vertical pipe 1, it can smoothly enter the coal dropping inclined pipe 2 through gravity and the inclinedly arranged coal spreading air nozzle 12. The coal spreading air duct 11 is connected to a low-temperature hot air source, and the low-temperature hot air source can be the hot primary / secondary air at the outlet of the preheater.

[0028] In this embodiment, the coal dropping inclined pipe 2 is a sandwich structure, which includes an outer tube body 21 and inner tube bodies stacked in sequence, the inner tube body includes a first inner tube body 22 and a plurality of second inner tube bodies 23, wherein the first inner tube body 22 is fixed on the top of the coal dropping inclined pipe 2, one end of the second inner tube body 23 is a bell-mouth section 231 formed by expanding outward, and the bell-mouth section 231 of the second inner tube body 23 is fixed to the inner wall of the outer tube body 21. During assembly, the first inner tube body 22 is first fixed, and then the first second inner tube body 23 is welded, so that the bell-mouth section 231 of the first second inner tube body 23 is located between the first inner tube body 22 and the outer tube body 21, so that an annular air supply gap 24 is formed between the first inner tube body 22 and the second inner tube body 23, and in order to support the gap between the first inner tube body 22 and the second inner tube body 23, a plurality of limit blocks 6 are arranged in the annular air supply gap 24; when installing the second second inner tube body 23, the bell-mouth section 231 of the second second inner tube body 23 is placed between the first second inner tube body 23 and the outer tube body 21, so that an annular air supply gap 24 is formed between the first second inner tube body 23 and the second second inner tube body 23, and similarly a plurality of limit blocks 6 are arranged in the annular air supply gap 24, and the subsequent assembly of other second inner tube bodies 23 is implemented according to the above method. A plurality of drying air ducts A31 are also provided on the outer tube body 21 of the coal dropping inclined tube 2. One drying air duct A31 corresponds to and is connected to an annular air supply gap 24. The drying air duct A31 is connected to a high-temperature air source or a low-temperature hot air source. The high-temperature air source can be high-temperature flue gas of 300 to 500°C, and the low-temperature hot air source can be the hot primary / secondary air at the outlet of the preheater. Those skilled in the art can determine the temperature of the drying air according to the moisture content of the fuel.

[0029] When high-moisture fuel enters the coal-dropping inclined pipe 2, dry air is ejected from the annular air supply gap 24 to form an annular airflow, which can be used as a purge air to promote the normal flow of fuel in the coal-dropping inclined pipe 2 and prevent high-moisture fuel from adhering to the circumferential surface of the inner pipe body. It can also dry the fuel in the coal-dropping inclined pipe 2. Compared with the prior art, there is no need to add additional pre-furnace drying equipment.

[0030] In this embodiment, the bottom of the coal dropping inclined pipe 2 is also connected with a cooling pipe 4 and a coal feeding port 5 in sequence, and the coal feeding port 5 is connected with the furnace. It should be noted that the cooling pipe 4 is connected with a cooling air duct 41. Since the cooling pipe 4 is close to the furnace side, a cooling air duct 41 is installed on the cooling pipe 4, and cooling air is used to cool the coal feeding port 5. In order to ensure that the fuel in the coal feeding port 5 can smoothly enter the furnace without fuel accumulation, a purge air nozzle 51 is installed at the bottom of the coal feeding port 5 for purge.

[0031] In this embodiment, a drying air duct B32 is provided on the top of the coal dropping inclined pipe 2. The drying air duct B32 is connected to the annular air supply gap 24 between the first inner tube body 22 and the second inner tube body 23. The drying air duct B32 is connected to a high-temperature air source or a low-temperature hot air source. The high-temperature air source can be high-temperature flue gas of 300 to 500°C, and the low-temperature hot air source can be the hot primary / secondary air at the outlet of the preheater. Technical personnel in this field can determine the temperature of the drying air according to the moisture content of the fuel.

[0032] In this embodiment, an annular air supply gap 24 is set on the coal dropping inclined pipe 2, and a high-temperature air source or a low-temperature hot air source is sent to the annular air supply gap 24 through the drying air duct A31 and the drying air duct B32, which can be used as a purge air to promote the normal flow of fuel in the coal dropping inclined pipe 2 and can also dry the fuel in the coal dropping inclined pipe 2.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-stage dry coal feeding device suitable for high-moisture fuel, comprising a coal receiving vertical pipe and a coal dropping inclined pipe, wherein the coal receiving vertical pipe is connected to the top of the coal dropping inclined pipe, and the bottom of the coal dropping inclined pipe is provided with a coal feeding port connected to the furnace, and the coal receiving vertical pipe is provided with a coal spreading air duct, characterized in that: The coal dropping inclined pipe comprises an outer pipe body and inner pipe bodies which are stacked one after another, wherein the inner pipe body comprises a first inner pipe body and a plurality of second inner pipe bodies, wherein the first inner pipe body is fixed to the top of the coal dropping inclined pipe, and one end of the second inner pipe body is provided with a bell mouth section which is fixed to the inner wall of the outer pipe body. The second inner tube body adjacent to the first inner tube body has a bell mouth section extending between the first inner tube body and the outer tube body, and an annular air supply gap is provided between the first inner tube body and the second inner tube body and is fixed by a limit block. Between two adjacent second inner tubes, the bell mouth section of one second inner tube extends to between the other second inner tube and the outer tube, and an annular air supply gap is provided between the two second inner tubes and is fixed by a limit block. The outer tube body of the coal dropping inclined tube is provided with a plurality of drying air ducts A, and one drying air duct A corresponds to and is connected with one annular air supply gap.

2. The multi-stage dry coal feeding device adapted to high-moisture fuel according to claim 1 is characterized in that: A cooling pipe is also provided between the coal dropping inclined pipe and the coal feeding port, and the cooling pipe is provided with a cooling air duct.

3. The multi-stage dry coal feeding device adapted to high-moisture fuel according to claim 1 is characterized in that: A drying air duct B is provided on the top of the coal dropping inclined pipe, and the drying air duct B is connected to the annular air supply gap between the first inner tube body and the second inner tube body.

4. The multi-stage dry coal feeding device adapted to high-moisture fuel according to claim 3 is characterized in that: The drying air duct A and the drying air duct B are connected to a high-temperature air source or a low-temperature hot air source.

5. The multi-stage dry coal feeding device adapted to high-moisture fuel according to claim 1 is characterized in that: The coal spreading air duct is connected to a low-temperature hot air source.

6. The multi-stage dry coal feeding device adapted to high-moisture fuel according to claim 1 is characterized in that: The coal spreading air duct is provided with a coal spreading air nozzle.