Cement kiln head double-internal-rotation air supply system

Abstract

The utility model discloses a cement kiln head double-internal-rotation air supply system which comprises a pulverized coal burner, a supporting frame is fixed to the outer wall of the pulverized coal burner, a first air supply channel is installed on one side of the pulverized coal burner, and the pulverized coal burner is connected with the first air supply channel through a plurality of connecting pipes; one side of the first air supply channel is connected with a second air supply channel through a communicating pipe, and control valves are arranged on the connecting pipe, the first air supply channel, the second air supply channel and the communicating pipe. The pulverized coal burner is sequentially provided with an ignition oil gun, a central air channel, a second inner rotational flow air channel, a first inner rotational flow air channel, a coal air channel, an outer axial flow air channel and an anti-coking air channel from inside to outside. The two independent air supply channels are arranged, and different air volumes and air speeds can be controlled, so that the air volume is adjusted according to the quality of raw materials or pulverized coal, the flame shape is controlled, the uniformity of a temperature field in the kiln and the flame shape are guaranteed, and the combustion efficiency and the production quality are improved.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, and in particular to a cement kiln head double internal vortex air supply system. Background Technology

[0002] As a high-energy-consuming and high-emission industry, the cement industry faces enormous pressure to conserve energy and reduce emissions, improve production efficiency, and reduce costs. As the core equipment of the cement rotary kiln system, the performance of the kiln head burner directly affects the clinker calcination quality, energy consumption, and emission levels. With the increasing environmental protection requirements and the adjustment of the energy structure, the research on pulverized coal burners will focus more on low emissions, high-efficiency combustion, and multi-fuel adaptability.

[0003] During the kiln head combustion process, the coal quality has a significant impact on the combustion efficiency and operating condition of the kiln head. When the fineness of the pulverized coal is 6% and the moisture content is around 5%, the relatively high water content in the pulverized coal will result in uneven clinker granulation, poor appearance quality, and uneven clinker quality. The main reason for this is that the burner has poor flame adjustment flexibility and low combustion efficiency. To address this issue, we propose a cement kiln head dual internal vortex air supply system. Utility Model Content

[0004] This application provides a cement kiln head dual internal vortex air supply system, which solves the problems of insufficient flexibility in flame adjustment inside the kiln, low pulverized coal combustion efficiency, and uneven clinker quality.

[0005] This application provides a cement kiln head dual internal vortex air supply system, including a pulverized coal burner. A support frame is fixed on the outer wall of the pulverized coal burner. A first air supply channel is installed on one side of the pulverized coal burner. The pulverized coal burner is connected to the first air supply channel through multiple connecting pipes. A second air supply channel is connected to one side of the first air supply channel through a connecting pipe. Control valves are provided on the connecting pipes, the first air supply channel, the second air supply channel, and the connecting pipe.

[0006] Preferably, the pulverized coal burner is provided with, from the inside out, an ignition oil gun, a central air channel, a second inner swirl air channel, a first inner swirl air channel, a coal air channel, an outer axial air channel, and an anti-coking air channel.

[0007] Preferably, the first air supply channel and the second air supply channel correspond to the first internal swirling air channel and the first internal swirling air channel, respectively.

[0008] Preferably, the first internal swirling airflow channel is inclined in the radial direction.

[0009] Preferably, the support frame includes a support frame, the pulverized coal burner is fixed on the support frame by a fixing bracket, and a chassis is installed at the bottom of the support frame. The chassis is supported on the ground by an adjustable base.

[0010] Preferably, there are four fixing frames, and the four fixing frames are arranged at equal intervals.

[0011] Preferably, the fixing frame includes a fixing seat fixed to the side wall of the pulverized coal burner, and a fixing screw is threaded onto the support frame, the fixing screw extending into the fixing seat.

[0012] Preferably, the support frame and the chassis are welded together using C-shaped steel.

[0013] Preferably, the control valve is a butterfly valve.

[0014] Preferably, the second air supply channel is also connected to a preheated air supply pipe via a T-junction.

[0015] As can be seen from the above technical solution, this application provides a cement kiln head dual internal vortex air supply system. In use, this system is installed on a rotary kiln via a support frame. When the moisture content of the raw materials and pulverized coal in the rotary kiln is low, or when the output is not at full capacity, a single-sided air supply pipe is opened. When operating at full capacity, or when the moisture content of the raw materials is greater than a certain percentage and the moisture content of the pulverized coal is greater than a certain percentage and the fineness is less than a certain percentage, both sides of the air supply are activated. During air supply, the two air supply channels are blocked by control valves, forming two independent air supply systems. Simultaneously, the channels of the pulverized coal burner are divided into two parts, with air supplied through the two air supply channels, providing differentiated air supply methods. It can also monitor the temperature field changes within the pulverized coal burner. When the flame impinges on the kiln lining, both channels can be opened to ensure control of the flame length, width, and rigidity, ensuring the flame shape adapts to production within the kiln.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. By setting up the first air supply channel and the second air supply channel, a dual air supply mode can be provided for the pulverized coal burner. The air pressure in each air supply mode can be adjusted according to the difference in the temperature field inside the kiln, thereby ensuring combustion efficiency and flame shape.

[0018] 2. The support frame provides stable support and mitigates vibrations generated during air supply regulation, ensuring proper installation and stable operation of the system.

[0019] In summary, this application sets up two independent air supply channels, which can control different air volumes and velocities, thereby adjusting the air volume according to the quality of raw materials or pulverized coal, and thus controlling the shape of the flame, ensuring the uniformity of the temperature field and the shape of the flame in the kiln, thereby improving combustion efficiency and production quality. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a cement kiln head double internal vortex air supply system proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the support frame structure of a cement kiln head double internal vortex air supply system proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of point A of a cement kiln head double internal vortex air supply system proposed in this utility model;

[0024] In the diagram: 1 Pulverized coal burner, 11 Anti-coking air duct, 12 Outer axial flow air duct, 13 Coal air duct, 14 First inner swirling air duct, 15 Second inner swirling air duct, 16 Central air duct, 17 Ignition oil gun, 2 Connecting pipe, 3 Control valve, 4 First air supply duct, 5 Second air supply duct, 6 Connecting pipe, 7 Support frame, 71 Support frame, 72 Chassis, 73 Adjusting base, 74 Fixing frame, 741 Fixing seat, 742 Fixing screw. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0026] See Figure 1-3This application discloses a double internal vortex air supply system for cement kiln heads. The system improves the flexibility and combustion efficiency of the pulverized coal burner 1 by modifying the air supply method. Specifically, it includes a pulverized coal burner 1, which, from the inside out, is equipped with an ignition oil gun 17, a central air channel 16, a second internal vortex air channel 15, a first internal vortex air channel 14, a coal air channel 13, an outer axial air channel 12, and an anti-coking air channel 11. Rotary kiln production is mainly controlled by the thermal field formed by the combustion of pulverized coal within the kiln. Depending on the material and the quality of the pulverized coal, such as calorific value, moisture content, and particle size, the resulting temperature field and the required temperature field differ. Therefore, this application divides the internal vortex air channel into two parts: the second internal vortex air channel 15 and the first internal vortex air channel 14. By controlling the internal air supply, the flame is controlled. There are two control methods: one is... A first air supply channel 4 is installed on one side of the pulverized coal burner 1. The pulverized coal burner 1 is connected to the first air supply channel 4 through multiple connecting pipes 2. The first air supply channel 4 can supply air to the entire pulverized coal burner 1. Secondly, a second air supply channel 5 is connected to one side of the first air supply channel 4 through a connecting pipe 6. The first air supply channel 4 and the second air supply channel 5 correspond to the first internal swirling air channel 14 and the first internal swirling air channel 14, respectively. Each air supply channel supplies air to at least one internal swirling air channel. The air usage of each channel is analyzed in combination with coal quality, raw material quality and kiln condition, and differentiated adjustments are made. Each internal swirling air channel provides a different wind speed, thereby controlling the flame length, width and rigidity, and achieving the ability to control the flame temperature distribution. The first internal swirling air channel 14 is inclined in the radial direction. It utilizes the strong swirling effect of the double internal swirling air to enhance the mixing effect of pulverized coal and air. Through the synergistic effect of multiple air ducts, three-dimensional mixing of fuel and air is achieved, which improves the combustion rate of pulverized coal and enables cement raw materials to be calcined under ideal temperature conditions to meet the formation conditions of clinker minerals. This achieves the goals of improving clinker quality, reducing coal consumption, and reducing environmental pollution. Control valves 3 are installed on the connecting pipe 2, the first air supply channel 4, the second air supply channel 5, and the connecting pipe 6 to control the ventilation of each channel. The control valves can be adjusted according to the required air supply. The control valve 3 in this application is a butterfly valve. A support frame 7 is fixed on the outer wall of the pulverized coal burner 1 to fix the pulverized coal burner 1 and support the part of it suspended in the rotary kiln, thereby improving its stability after installation and reducing the thrust changes and vibrations caused by changes in air volume.

[0027] In this utility model, the support frame 7 includes a support frame 71 surrounding the pulverized coal burner 1. The pulverized coal burner 1 is fixed to the support frame 71 by fixing brackets 74. There are four fixing brackets 74, which are equally spaced. The corresponding support frame 71 is rectangular, and the four sides of the support frame 71 correspond to the four fixing brackets 74 respectively. The pulverized coal burner 1 is installed and fixed by four-point support. A base plate 72 is installed at the bottom of the support frame 71 to increase the stability of the support frame after installation. The base plate 72 is supported on the ground by an adjustable base 73 and is used to adjust the horizontal position of the support frame 71 so that it can be fixed by the fixing brackets 74.

[0028] Furthermore, the fixing frame 74 includes a fixing seat 741 fixed to the side wall of the pulverized coal burner 1, a fixing screw 742 threaded on the support frame 71, a hole corresponding to the fixing screw 742 on the fixing seat 741, the fixing screw 742 can be rotated on the support frame 71 to adjust its extension length, and the fixing screw 742 extends into the fixing seat 741 to achieve the installation and fixing of the pulverized coal burner 1;

[0029] Furthermore, the support frame 71 and the chassis 72 are welded together using C-shaped steel, providing stable support. The raw materials are readily available and the manufacturing process is relatively simple.

[0030] In this utility model, the second air supply channel 5 is also connected to a preheating air supply pipe through a three-way pipe. In addition to supplying air through the normal air supply unit, the second air supply channel 5 of this application can also utilize the waste heat in the waste heat system to build a preheating pipe for introducing hot air into the pulverized coal burner, thereby improving combustion efficiency, reducing the impact of inferior coal on production, and ensuring the stability and quality of production.

[0031] As can be seen from the above technical solution, this application is installed on the rotary kiln via the support frame 7 during use. When the moisture content of the raw materials and pulverized coal in the rotary kiln is low, or when the output is not at full load, a single-sided air supply pipe is opened. When operating at full load, or when the moisture content of the raw materials is greater than 3% and the moisture content of the pulverized coal is greater than 5% and the fineness is less than 6%, a double-sided air supply is opened. During air supply, the two air supply channels are blocked by the control valve 3, forming two independent air supply systems. At the same time, each channel of the pulverized coal burner 1 is divided into two parts, and air is supplied through the two air supply channels, providing differentiated air supply methods. It can also monitor the temperature field changes inside the pulverized coal burner 1. When the flame scours the kiln lining, the double channels can be opened to ensure control of the flame length, width, and rigidity, ensuring that the flame shape adapts to the production inside the kiln.

[0032] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0033] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.

Claims

1. A cement kiln head dual internal vortex air supply system, comprising a pulverized coal burner (1), characterized in that: A support frame (7) is fixed on the outer wall of the pulverized coal burner (1). A first air supply channel (4) is installed on one side of the pulverized coal burner (1). The pulverized coal burner (1) is connected to the first air supply channel (4) through multiple connecting pipes (2). A second air supply channel (5) is connected to one side of the first air supply channel (4) through a connecting pipe (6). Control valves (3) are provided on the connecting pipe (2), the first air supply channel (4), the second air supply channel (5), and the connecting pipe (6).

2. The cement kiln head double internal vortex air supply system according to claim 1, characterized in that, The pulverized coal burner (1) is provided with an ignition oil gun (17), a central air channel (16), a second inner swirling air channel (15), a first inner swirling air channel (14), a coal air channel (13), an outer axial air channel (12), and an anti-coking air channel (11) from the inside to the outside.

3. The cement kiln head double internal vortex air supply system according to claim 2, characterized in that, The first air supply channel (4) and the second air supply channel (5) correspond to the first internal swirling air channel (14) and the first internal swirling air channel (14), respectively.

4. The cement kiln head double internal vortex air supply system according to claim 2, characterized in that, The first internal swirling airflow channel (14) is inclined in the radial direction.

5. The cement kiln head double internal vortex air supply system according to claim 1, characterized in that, The support frame (7) includes a support frame (71), the pulverized coal burner (1) is fixed on the support frame (71) by a fixing frame (74), and a chassis (72) is installed at the bottom of the support frame (71). The chassis (72) is supported on the ground by an adjusting base (73).

6. The cement kiln head double internal vortex air supply system according to claim 5, characterized in that, There are four fixing frames (74), and the four fixing frames (74) are arranged at equal intervals.

7. A cement kiln head double internal vortex air supply system according to claim 6, characterized in that, The fixing frame (74) includes a fixing seat (741) fixed to the side wall of the pulverized coal burner (1), and a fixing screw (742) is threaded on the support frame (71), the fixing screw (742) extending into the fixing seat (741).

8. A cement kiln head double internal vortex air supply system according to claim 5, characterized in that, The support frame (71) and the chassis (72) are welded together using C-shaped steel.

9. A cement kiln head double internal vortex air supply system according to claim 1, characterized in that, The control valve (3) is a butterfly valve.

10. A cement kiln head double internal vortex air supply system according to claim 1, characterized in that, The second air supply channel (5) is also connected to a preheated air supply pipeline via a T-junction.

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