Coal injection device for decomposing furnace

Abstract

The utility model provides a coal injection device for a decomposing furnace, and relates to the technical field of coal injection, the coal injection device comprises a coal feeding pipe extending to the middle part in the decomposing furnace, the end, located in the decomposing furnace, of the coal feeding pipe is bent downwards and is provided with a coal injection assembly, and the coal injection assembly comprises a connecting cylinder, a sprue spreader and a mounting frame; the split-flow cone is mounted at the lower end of the connecting cylinder through the mounting frame, and an annular coal injection hole is formed between the split-flow cone and the lower end of the connecting cylinder. The split-flow cone and the annular coal injection hole are utilized to disperse originally concentrated pulverized coal flow into annular dispersed flow, so that the coverage range of the pulverized coal in the decomposing furnace is expanded, and the decomposing efficiency is improved; the situation that pulverized coal is concentrated in a certain area is avoided, the pulverized coal is distributed more evenly in the decomposing furnace, the mixing degree of the pulverized coal, airflow in the decomposing furnace and raw materials is improved, and therefore the combustion efficiency and the raw material decomposing effect are improved.

Description

Technical Field

[0001] This application relates to the field of pulverized coal injection technology, and more specifically, to a pulverized coal injection device for a decomposition furnace. Background Technology

[0002] A decomposition furnace is a device that uses the heat generated by fuel combustion to preheat and decompose raw materials in a suspended state. Inside the decomposition furnace, fuel (usually pulverized coal) is thoroughly mixed and burned with high-temperature exhaust gas from the kiln tail and tertiary air, providing a high-temperature environment for the decomposition of raw materials.

[0003] Currently, the pulverized coal injection device for precalciner generally has a simple straight pipe structure, using a heat-resistant straight steel pipe to directly blow coal into the furnace via air transport. In actual use, to ensure uniform pulverized coal dispersion, several straight cylindrical pulverized coal injection pipes need to be installed circumferentially inside the precalciner.

[0004] However, even with multiple straight-tube pulverized coal injection pipes installed around the perimeter of the decomposition furnace, there is still a relatively large amount of pulverized coal around the installation point, while the amount of pulverized coal in other locations is relatively small. This results in incomplete combustion in local areas, affecting the overall combustion efficiency of the pulverized coal and the decomposition effect of the raw materials. Summary of the Invention

[0005] The purpose of this application is to provide a pulverized coal injection device for a decomposition furnace, which can solve the technical problem in the prior art that even if multiple straight-tube pulverized coal injection pipes are installed circumferentially in the decomposition furnace, there will still be a situation where there is more pulverized coal around the installation point and less pulverized coal at other locations, resulting in incomplete local combustion and affecting the overall combustion efficiency of pulverized coal and the decomposition effect of raw materials.

[0006] This application provides a pulverized coal injection device for a decomposition furnace, including a coal feeding pipe extending to the middle of the decomposition furnace. One end of the coal feeding pipe inside the decomposition furnace is bent downward and equipped with a pulverized coal injection assembly. The pulverized coal injection assembly includes a connecting cylinder, a flow divider cone, and a mounting bracket. The upper end of the connecting cylinder is connected to the coal feeding pipe, and the flow divider cone is mounted on the lower end of the connecting cylinder through the mounting bracket. An annular pulverized coal injection hole is formed between the flow divider cone and the lower end of the connecting cylinder.

[0007] The mounting bracket includes a connecting rod and multiple helical inclined blades. The lower end of the connecting rod is connected to the top of the diverter cone. The multiple helical inclined blades are evenly fixed on the upper periphery of the connecting rod. The end of the helical inclined blade away from the connecting rod is fixedly connected to the inner wall of the connecting cylinder.

[0008] Furthermore, the upper end of the connecting cylinder is provided with an external thread, and the lower end of the coal feeding pipe is provided with an internal thread that matches the external thread. The connecting cylinder is threadedly connected to the coal feeding pipe through the cooperation of the external thread and the internal thread.

[0009] Furthermore, a connecting post is fixedly provided at the top of the diverting cone, and a connecting groove adapted to the connecting post is provided on the connecting rod. The connecting post is movably disposed in the connecting groove. A first limiting ring is fixedly provided at the end of the connecting post away from the diverting cone, and a second limiting ring is fixedly provided at the opening of the connecting groove. A spring is provided in the connecting groove, and the spring is located between the first limiting ring and the second limiting ring.

[0010] Furthermore, the top of the flow divider cone is provided with a wear-resistant layer.

[0011] Furthermore, the lower inner side of the connecting cylinder is provided with a slope, which is parallel to the inclined surface of the diverting cone.

[0012] Furthermore, five spiral tilting blades are provided.

[0013] The beneficial effects of this utility model are:

[0014] This utility model provides a flow divider cone that is installed at the lower end of the connecting cylinder via a mounting bracket. An annular pulverized coal injection hole is formed between the flow divider cone and the lower end of the connecting cylinder. By utilizing the flow divider cone and the annular pulverized coal injection hole, the originally concentrated pulverized coal flow is dispersed into an annular dispersed flow, which expands the coverage area of ​​pulverized coal in the decomposition furnace and avoids the situation where pulverized coal is concentrated in a certain area. This makes the pulverized coal more evenly distributed in the decomposition furnace, which helps to improve the mixing degree of pulverized coal with the airflow and raw materials in the decomposition furnace, thereby improving the combustion efficiency and raw material decomposition effect. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 These are schematic diagrams of structures in some embodiments of this application;

[0017] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0018] Figure 3 This is a schematic diagram of the mounting bracket and diversion cone in some embodiments of this application;

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Coal feeding pipe; 2. Pulverized coal injection assembly; 21. Connecting cylinder; 22. Diverter cone; 23. Mounting bracket; 231. Connecting rod; 232. Spiral inclined blade; 3. Annular pulverized coal injection hole; 4. External thread; 5. Internal thread; 6. Connecting column; 61. First limiting ring; 7. Connecting groove; 71. Second limiting ring; 8. Spring; 9. Inclined slope; 10. Decomposition furnace. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific implementation examples:

[0028] like Figure 1-3 As shown, this application provides a pulverized coal injection device for a decomposition furnace, including a coal feeding pipe 1 extending to the middle of the decomposition furnace 10. One end of the coal feeding pipe 1 inside the decomposition furnace 10 is bent downward and equipped with a pulverized coal injection assembly 2. The pulverized coal injection assembly 2 includes a connecting cylinder 21, a diverting cone 22, and a mounting bracket 23. The upper end of the connecting cylinder 21 is connected to the coal feeding pipe 1, and the diverting cone 22 is mounted on the lower end of the connecting cylinder 21 through the mounting bracket 23. An annular pulverized coal injection hole 3 is formed between the diverting cone 22 and the lower end of the connecting cylinder 21. In use, the coal feeding pipe 1 transports coal by air. When the coal powder is blown into the pulverized coal injection assembly 2, the pulverized coal forms an annular injection hole 3 at the lower end of the diverting cone 22 and the connecting cylinder 21. When the pulverized coal passes through the diverting cone 22, it is injected out in an annular manner from the annular injection hole 3, which disperses the originally concentrated pulverized coal flow into an annular dispersed flow. This expands the coverage area of ​​the pulverized coal in the decomposition furnace 10, avoids the situation where the pulverized coal is concentrated in a certain area, and makes the pulverized coal more evenly distributed in the decomposition furnace 10. This helps to improve the mixing degree of pulverized coal with the airflow and raw materials in the decomposition furnace 10, thereby improving the combustion efficiency and the decomposition effect of the raw materials.

[0029] like Figure 2 and Figure 3 As shown, the mounting frame 23 includes a connecting rod 231 and multiple spiral inclined blades 232. The lower end of the connecting rod 231 is connected to the top of the diversion cone 22. The multiple spiral inclined blades 232 are uniformly fixed on the upper periphery of the connecting rod 231. The end of the spiral inclined blade 232 away from the connecting rod 231 is fixedly connected to the inner wall of the connecting cylinder 21. When the pulverized coal enters the connecting cylinder 21 from the coal feeding pipe 1, the spiral inclined blades 232 will guide the pulverized coal to flow along its inclined direction. Since the spiral inclined blades 232 are spiral, the pulverized coal will generate rotational motion during the flow. This rotational motion helps to further disperse the pulverized coal, making the pulverized coal more evenly distributed in the connecting cylinder 21. Then, when it is sprayed out from the annular coal injection hole 3, it can enter the decomposition furnace 10 in a more dispersed and uniform state, promoting a more complete combustion reaction, thereby further improving the combustion efficiency and raw material decomposition effect.

[0030] like Figure 2As shown, the upper end of the connecting cylinder 21 is provided with an external thread 4, and the lower end of the coal feeding pipe 1 is provided with an internal thread 5 that is compatible with the external thread 4. The connecting cylinder 21 is threadedly connected to the coal feeding pipe 1 through the cooperation of the external thread 4 and the internal thread 5, which facilitates the installation and disassembly of the connecting cylinder 21.

[0031] like Figure 2 As shown, a connecting column 6 is fixedly provided at the top of the diversion cone 22, and a connecting groove 7 adapted to the connecting column 6 is provided on the connecting rod 231. The connecting column 6 is movably disposed in the connecting groove 7. A first limiting ring 61 is fixedly provided at the end of the connecting column 6 away from the diversion cone 22, and a second limiting ring 71 is fixedly provided at the opening of the connecting groove 7. A spring 8 is provided in the connecting groove 7, and the spring 8 is located between the first limiting ring 61 and the second limiting ring 71. When the coal injection device is working, the coal powder flow will generate an impact force on the diversion cone 22. The presence of the spring 8 gives the diversion cone 22 a certain buffering capacity. In addition, due to the elastic effect of the spring 8, the diversion cone 22 can adaptively adjust the size of the annular coal injection hole 3 according to the coal powder airflow pressure, so as to better adapt to the changes in working conditions.

[0032] like Figure 2 and Figure 3 As shown, the top of the diversion cone 22 is provided with a wear-resistant layer (not shown in the figure). During the operation of the pulverized coal injection device, the top of the diversion cone 22 is in direct contact with the high-speed flowing pulverized coal. The scouring and friction of the pulverized coal can easily cause wear on the surface of the diversion cone 22. The presence of the wear-resistant layer can effectively resist the scouring and wear of the pulverized coal, reduce the material loss at the top of the diversion cone 22, and thus extend the service life of the diversion cone 22.

[0033] like Figure 2 As shown, the lower inner side of the connecting cylinder 21 is provided with a ramp 9, which is parallel to the inclined surface of the diversion cone 22. The ramp 9 can reduce the scouring of the lower inner side of the connecting cylinder 21 when the coal powder is ejected from the annular coal injection hole 3, so that the coal powder can be ejected more thoroughly through the annular coal injection hole 3.

[0034] like Figure 3 As shown, the spiral inclined blades 232 are provided with five blades. Compared with a smaller number of blades, five blades can make the coal powder receive a more uniform driving force during the conveying process, reduce the accumulation and blockage of coal powder in the connecting cylinder 21, and improve the conveying efficiency of coal powder.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pulverized coal injection device for a decomposition furnace, characterized in that: The device includes a coal feeding pipe extending to the middle of the decomposition furnace. One end of the coal feeding pipe inside the decomposition furnace is bent downward and equipped with a coal injection assembly. The coal injection assembly includes a connecting cylinder, a diverting cone, and a mounting bracket. The upper end of the connecting cylinder is connected to the coal feeding pipe, and the diverting cone is mounted on the lower end of the connecting cylinder through the mounting bracket. An annular coal injection hole is formed between the diverting cone and the lower end of the connecting cylinder.

2. The pulverized coal injection device for a decomposition furnace according to claim 1, characterized in that: The mounting bracket includes a connecting rod and multiple helical inclined blades. The lower end of the connecting rod is connected to the top of the diverter cone. The multiple helical inclined blades are evenly fixed on the upper periphery of the connecting rod. The end of the helical inclined blade away from the connecting rod is fixedly connected to the inner wall of the connecting cylinder.

3. The pulverized coal injection device for a decomposition furnace according to claim 1, characterized in that: The upper end of the connecting cylinder is provided with an external thread, and the lower end of the coal feeding pipe is provided with an internal thread that matches the external thread. The connecting cylinder is threadedly connected to the coal feeding pipe through the cooperation of the external thread and the internal thread.

4. The pulverized coal injection device for a decomposition furnace according to claim 2, characterized in that: A connecting post is fixedly provided at the top of the flow divider cone. A connecting groove adapted to the connecting post is provided on the connecting rod. The connecting post is movably disposed in the connecting groove. A first limiting ring is fixedly provided at the end of the connecting post away from the flow divider cone. A second limiting ring is fixedly provided at the opening of the connecting groove. A spring is provided in the connecting groove. The spring is located between the first limiting ring and the second limiting ring.

5. A pulverized coal injection device for a decomposition furnace according to claim 1, characterized in that: The top of the flow divider cone is provided with a wear-resistant layer.

6. The pulverized coal injection device for a decomposition furnace according to claim 1, characterized in that: The lower inner side of the connecting cylinder is provided with a slope, which is parallel to the inclined surface of the diversion cone.

7. A pulverized coal injection device for a decomposition furnace according to claim 2, characterized in that: The spiral tilting blades are provided in five parts.

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