Cement kiln decomposer burner promoting coal combustion

Abstract

This utility model discloses a cement kiln decomposition furnace burner that promotes pulverized coal combustion, relating to the field of cement production technology. It includes a main pipe and an oxygen delivery pipe. The main pipe has several hydrogen channels equidistantly distributed around its circumference. The oxygen delivery pipe is located inside the main pipe, with its axis coinciding with the axis of the main pipe. A pulverized coal channel is formed between the outer wall of the oxygen delivery pipe and the inner wall of the main pipe. This utility model, through its multi-channel design, introduces hydrogen and oxygen, creating a combustion-promoting zone at the burner outlet. This solves the problem of unsuitability of low-quality coal and low-volatile coal in cement decomposition furnaces, improving the burnout rate of low-quality coal, low-volatile coal, and coarse pulverized coal. This effectively improves fuel utilization efficiency, stabilizes decomposition furnace operating conditions, and enhances the operational stability and clinker quality of the cement clinker production system.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, specifically to a cement kiln decomposition furnace burner that promotes pulverized coal combustion. Background Technology

[0002] In cement clinker production, cement kilns require pulverized coal burners in their precalciner furnaces. Currently used single-channel burners can adequately meet the operational requirements of new dry-process cement production lines when coal quality is good. However, in cases of poor coal quality, low volatile matter content, or coarse pulverized coal, incomplete combustion, low raw meal decomposition rates, and fluctuating furnace operating conditions frequently occur, affecting the safe and stable operation of the production system and causing fluctuations and declines in clinker product quality. Furthermore, the poor adaptability of these burners limits the range of coal that can be purchased for production. High-quality coal is often in short supply and relatively expensive, hindering cement companies from further reducing energy costs in cement production.

[0003] With the introduction of dual-carbon goals, the application scenarios of green electricity and green hydrogen are constantly expanding in the industrial field. Cement enterprises have already conducted demonstrations and explorations of green electricity and green hydrogen technologies. However, simply adding hydrogen injection holes for direct combustion and using hydrogen as a fuel to replace coal in terms of calorific value is difficult to balance economically. Therefore, a cement kiln decomposition furnace burner that promotes pulverized coal combustion is needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a cement kiln decomposition furnace burner that promotes pulverized coal combustion, so as to solve the problems existing in the prior art mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A cement kiln decomposition furnace burner for promoting pulverized coal combustion includes a main pipe and an oxygen delivery pipe. The main pipe has several hydrogen channels arranged in the circumferential sidewall, which are equidistantly distributed around the circumference of the main pipe. The oxygen delivery pipe is located inside the main pipe, and its axis coincides with the axis of the main pipe. A pulverized coal channel is formed between the outer wall of the oxygen delivery pipe and the inner wall of the main pipe.

[0007] Preferably, the outlet end of the hydrogen channel is provided with a hydrogen guide hole, the axis of the hydrogen guide hole is inclined relative to the axis of the main body, and the included angle between the two axes is set to 10°-30°.

[0008] Preferably, the outlet end of the oxygen delivery pipe is provided with a constriction.

[0009] Preferably, the oxygen delivery pipe is fixed inside the main body by a connecting plate.

[0010] Preferably, the outlet of the pulverized coal channel is straight, and the inside of the pulverized coal channel is provided with guide vanes.

[0011] Preferably, the air inlet end of the main body is provided with a flange.

[0012] Preferably, the outlet faces of the hydrogen channel, oxygen delivery pipe, and pulverized coal channel are flush.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model, through a multi-channel design, introduces hydrogen and oxygen to form a combustion-promoting zone in the burner outlet area. This solves the problem of the unsuitability of low-quality coal and low-volatile coal in cement decomposition furnaces, improves the combustion rate of low-quality coal, low-volatile coal and coarse coal powder, effectively improves fuel utilization efficiency, stabilizes decomposition furnace operating conditions, and improves the operational stability and clinker quality level of the cement clinker production system.

[0015] 2. This utility model improves the adaptability of coal used in decomposition furnaces, providing cement enterprises with more options in terms of raw coal procurement and alternative fuel use. This is conducive to reducing energy (coal, alternative fuel) procurement costs, reducing cement clinker production costs, and improving the market competitiveness of the products.

[0016] 3. This utility model changes the existing approach and status quo of simply replacing coal with hydrogen through direct combustion. By using a multi-channel structure, pulverized coal, hydrogen, and oxygen form a combustion-promoting zone in a small area at the burner outlet. This can effectively improve the thermal effect of coal and alternative fuels with less hydrogen consumption, effectively reduce the cost of hydrogen use, and achieve an organic integration of the economic benefits and carbon reduction effects of green hydrogen in cement plants.

[0017] 4. By setting up hydrogen and oxygen channels, this utility model can prevent the situation where hydrogen combustion and pulverized coal combustion compete for oxygen, realize the function of the combustion-promoting zone in the burner outlet area, and effectively utilize the oxygen produced by the water electrolysis hydrogen production system, avoiding oxygen venting and waste. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the right-side structure of this utility model.

[0020] Figure 3 This is a top view of the structure of this utility model.

[0021] Figure 4 This utility model Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0022] In the diagram: 1. Main pipe; 2. Hydrogen channel; 3. Hydrogen guide hole; 4. Oxygen delivery pipe; 5. Connecting plate; 6. Pulverized coal channel; 7. Flange. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please see Figure 1-4 The present invention provides the following technical solution:

[0025] A cement kiln decomposition furnace burner for promoting pulverized coal combustion includes a main pipe 1 and an oxygen supply pipe 4. The inlet end of the main pipe 1 is provided with a flange 7, which facilitates the connection of the burner with the material and gas supply pipelines. Several hydrogen channels 2 are provided in the circumferential side wall of the main pipe 1. The hydrogen channels 2 are equidistantly distributed on the circumference of the main pipe 1. The outlet end of the hydrogen channel 2 is provided with a hydrogen guide hole 3. The axis of the hydrogen guide hole 3 is inclined relative to the axis of the main pipe 1, and the included angle between the two axes is set to 10°-30°. The purpose of the hydrogen guide hole 3 is to enable the output hydrogen and oxygen jet lines to converge, forming a combustion-promoting zone, so that the hydrogen and oxygen mix and burn more completely.

[0026] The oxygen delivery pipe 4 is located inside the main body 1 and is fixed inside the main body 1 by a connecting plate 5. The axis of the oxygen delivery pipe 4 coincides with the axis of the main body 1. The outlet end of the oxygen delivery pipe 4 is provided with a constriction. The purpose of the constriction at the outlet end of the oxygen delivery pipe 4 is to increase the output flow rate of oxygen and promote the combustion of hydrogen and pulverized coal.

[0027] A pulverized coal channel 6 is formed between the outer wall of the oxygen delivery pipe 4 and the inner wall of the main body 1. The outlet of the pulverized coal channel 6 is straight, and the interior of the pulverized coal channel 6 is equipped with guide vanes. The outlet ends of the hydrogen channel 2, the oxygen delivery pipe 4, and the pulverized coal channel 6 are flush. When the pulverized coal is delivered out of the pulverized coal channel 6, it enters the combustion-promoting zone where hydrogen and oxygen meet. The hydrogen and oxygen undergo a combustion reaction, which can quickly increase the temperature of the combustion-promoting zone, accelerate the combustion speed of the pulverized coal, and improve the pulverized coal burnout rate.

[0028] In actual use of this burner, the oxygen supply pipe 4, pulverized coal channel 6, and hydrogen channel 2 are independent of each other. The front end of the burner is connected to the corresponding supply pipes. Each supply pipe is equipped with a shut-off valve, gate valve, or flow regulating valve, allowing for selection of hydrogen-blended or oxygen-supplyed combustion based on operating conditions. The flow rates of hydrogen-blended and oxygen-supplyed gases can be flexibly adjusted according to the quality of the pulverized coal, resulting in more complete combustion of the pulverized coal, improving the utilization rate of pulverized coal, ensuring product quality, and reducing the procurement cost of pulverized coal. Furthermore, the application of this burner can significantly reduce the amount of hydrogen required for hydrogen-blended combustion, eliminating the need for a separate oxygen-enriched system. It effectively utilizes the surplus electricity from distributed photovoltaic and decentralized wind power in cement production enterprises to carry out small-scale green hydrogen production, contributing to the green transformation of cement clinker production with relatively low investment in water electrolysis hydrogen production.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A burner for a cement kiln decomposition furnace that promotes pulverized coal combustion, characterized in that, It includes a main body (1) and an oxygen delivery pipe (4). The main body (1) has several hydrogen channels (2) inside its circumferential sidewall. The hydrogen channels (2) are equidistantly distributed on the circumference of the main body (1). The oxygen delivery pipe (4) is located inside the main body (1). The axis of the oxygen delivery pipe (4) coincides with the axis of the main body (1). A coal powder channel (6) is formed between the outer wall of the oxygen delivery pipe (4) and the inner wall of the main body (1). The outlet end of the hydrogen channel (2) is provided with a hydrogen guide hole (3). The axis of the hydrogen guide hole (3) is inclined relative to the axis of the main body (1), and the included angle between the two axes is set to 10°-30°. The outlet end of the oxygen delivery pipe (4) is provided with a constriction. The outlet of the pulverized coal channel (6) is set in a straight line, and the inside of the pulverized coal channel (6) is provided with guide vanes.

2. The cement kiln decomposition furnace burner for promoting pulverized coal combustion according to claim 1, characterized in that: The oxygen delivery pipe (4) is fixed inside the main body (1) by a connecting plate (5).

3. The cement kiln decomposition furnace burner for promoting pulverized coal combustion according to claim 1, characterized in that: The main body (1) is provided with a flange (7) at the air inlet end.

4. A cement kiln decomposition furnace burner for promoting pulverized coal combustion according to claim 1, characterized in that: The outlet ends of the hydrogen channel (2), oxygen delivery pipe (4) and pulverized coal channel (6) are flush.

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