A coal injection pipe for cement kiln tail

Abstract

The present invention discloses a coal injection pipe for the tail of a cement kiln in the field of cement production technology, and the coal injection pipe for the tail of a cement kiln comprises a coal delivery pipe, which is connected to a coal injection pipe. The coal injection pipe is a straight-cylinder blind pipe structure, and a plurality of coal outlet pipes are connected around the side wall at the end of the coal injection pipe. The coal outlet pipe is provided with a trumpet-shaped opening. The angle β of the trumpet-shaped opening of the coal outlet pipe is in the range of 90° to 120°. The length x of the coal outlet pipe accounts for one third of the total length y of the coal injection pipe. A reinforcing rib is provided at the connection between the coal delivery pipe and the coal injection pipe. The present invention improves the conveying efficiency and dispersion of coal powder, thereby improving the mixing degree of coal powder and air, and improving the burnout rate of coal powder.

Description

Technical Field

[0001] The invention relates to the technical field of cement production, in particular to a coal injection pipe for the tail of a cement kiln. Background Art

[0002] In the cement production process, the coal injection pipe at the end of the kiln is an important part of the firing system. Its function is to spray coal powder into the kiln to ensure that the coal powder and the material are fully mixed and burned, providing a heat source for the firing of cement clinker. At present, the widely used coal injection pipe at the end of the firing kiln is a pipe-type 360 ​​coal pipe, which is characterized by a pipe design with an elbow.

[0003] However, in actual use, the pipe-type 360 ​​coal pipe exposed some technical problems. First, due to the existence of its elbow, the wind speed at the elbow is inevitably reduced, resulting in a significant reduction in the coal powder conveying efficiency, which is specifically manifested in the slowdown of coal powder conveying speed and uneven distribution of coal powder particles, which in turn affects the combustion efficiency and combustion stability. Secondly, the coal outlet of the 360 ​​coal pipe is a cylindrical structure. This design significantly reduces the dispersion of coal powder, making it difficult to achieve uniform injection and efficient combustion of coal powder. In addition, since the head of the pipe-type 360 ​​coal pipe is heavy, it is easy to bend and deform due to heat under high-temperature working conditions, which leads to the deviation of the injection angle, which is specifically manifested in uneven injection and uneven distribution of coal powder in the kiln, which further affects the mixing uniformity of coal powder and materials, resulting in reduced combustion efficiency and poor preheating effect.

[0004] Therefore, the existing pipe-type 360 ​​coal pipe has obvious deficiencies in coal powder dispersion, structural stability and injection efficiency. An improved kiln tail coal injection pipe is urgently needed to solve the above technical problems and meet the needs of modern cement production. Summary of the invention

[0005] The main purpose of the present invention is to provide a coal injection pipe for the tail of a cement kiln, so as to solve the problems mentioned in the background technology.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A coal injection pipe for the tail of a cement kiln comprises a coal delivery pipe, which is connected to a coal injection pipe. The coal injection pipe is a straight-cylinder blind pipe structure, and the side wall of the end of the coal injection pipe is connected to a plurality of coal outlet pipes. The coal outlet pipe is provided with a trumpet-shaped opening.

[0008] Furthermore, the angle β of the trumpet-shaped opening of the coal outlet pipe ranges from 90° to 120°.

[0009] Furthermore, the length x of the coal outlet pipe accounts for one third of the total length y of the coal injection pipe.

[0010] Furthermore, a reinforcing rib is provided at the connection between the coal delivery pipe and the coal injection pipe.

[0011] The present invention also includes other components that can enable the coal injection pipe at the tail of the cement kiln to be used normally, and these devices or components all adopt conventional technical means in the field.

[0012] The working principle of the present invention is: the straight-cylinder coal injection pipe will not affect the wind speed, thereby improving the coal powder transportation efficiency. The trumpet-shaped coal outlet pipe can improve the dispersion of coal powder, realize the uniform injection and efficient combustion of coal powder. The straight-cylinder coal injection pipe also removes the heavier head of the pipe-type 360 ​​coal pipe, and adds reinforcing ribs to avoid the deviation of the injection angle caused by the bending deformation of the coal injection pipe due to heat.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the conveying efficiency and dispersion degree of coal powder are improved, thereby improving the mixing degree of coal powder and air, and improving the combustion rate of coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a schematic diagram of the overall structure of a coal injection pipe for a cement kiln tail.

[0015] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0016] In the figure: 1. Coal delivery pipe; 2. Coal injection pipe; 3. Coal outlet pipe; 4. Reinforcement ribs. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Example:

[0019] like Figures 1-2 As shown, a coal injection pipe for the tail of a cement kiln comprises a coal delivery pipe 1, which is connected to a coal injection pipe 2. The coal injection pipe 2 is a straight-cylinder blind pipe structure, and the side wall of the end of the coal injection pipe 2 is surrounded and connected to a plurality of coal outlet pipes 3. The coal outlet pipe 3 is provided with a trumpet-shaped opening.

[0020] Specifically, the angle β of the trumpet-shaped opening of the coal outlet pipe 3 ranges from 90° to 120°. The length x of the coal outlet pipe 3 accounts for one third of the total length y of the coal injection pipe 2 .

[0021] In addition, a reinforcing rib 4 is provided at the connection between the coal delivery pipe 1 and the coal injection pipe 2 .

[0022] The working principle of the coal injection pipe for the tail of a cement kiln of the present invention is as follows: the straight-cylinder coal injection pipe 2 will not affect the wind speed, thereby improving the coal powder conveying efficiency. The trumpet-shaped coal outlet pipe 3 can improve the dispersion of coal powder, and realize the uniform injection and efficient combustion of coal powder. The straight-cylinder coal injection pipe 2 also removes the heavier head of the pipe-type 360 ​​coal pipe, and adds a reinforcing rib 4 to avoid the deviation of the injection angle caused by the bending deformation of the coal injection pipe 2 due to heat.

[0023] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. A coal injection pipe for a cement kiln tail, comprising a coal delivery pipe (1), wherein the coal delivery pipe (1) is connected to a coal injection pipe (2), characterized in that: The coal injection pipe (2) is a straight-cylinder blind pipe structure, and the side wall at the end of the coal injection pipe (2) is surrounded and connected with a plurality of coal outlet pipes (3); the coal outlet pipes (3) are provided with trumpet-shaped openings.

2. The coal injection pipe for cement kiln tail according to claim 1, characterized in that: The angle β of the trumpet-shaped opening of the coal outlet pipe (3) is in the range of 90° to 120°.

3. The coal injection pipe for cement kiln tail according to claim 1, characterized in that: The length x of the coal outlet pipe (3) accounts for one third of the total length y of the coal injection pipe (2).

4. The coal injection pipe for cement kiln tail according to claim 1, characterized in that: A reinforcing rib (4) is provided at the connection between the coal delivery pipe (1) and the coal injection pipe (2).

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