Hydrogen-doped efficient combustor for cement kiln decomposing furnace

Abstract

The invention discloses a hydrogen-doped efficient burner for a cement kiln decomposing furnace, and relates to the technical field of cement production, the hydrogen-doped efficient burner comprises a main pipe body and an oxygen delivery pipe, a plurality of hydrogen channels are arranged in the circumferential side wall of the main pipe body, the hydrogen channels are circumferentially distributed on the main pipe body at equal intervals, and the oxygen delivery pipe is arranged in the main pipe body. The axis of the oxygen conveying pipe coincides with the axis of the main pipe body, and a pulverized coal channel is formed between the outer wall of the oxygen conveying pipe and the inner wall of the main pipe body. By means of the multi-channel design, hydrogen and oxygen are introduced, a combustion promoting area is formed in an outlet area of the combustor, the problem that inferior coal and low-volatile-matter coal are not suitable for being used in the cement decomposing furnace can be solved, the burn-off rate of the inferior coal, the low-volatile-matter coal and coarse coal powder can be increased, and the combustion efficiency of the cement decomposing furnace is improved. The fuel utilization efficiency is effectively improved, the working condition of the decomposing furnace is stabilized, and the operation stability and clinker quality level of a cement clinker production system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of cement production, in particular to a hydrogen-doped high-efficiency burner for a cement kiln decomposition furnace. Background Art

[0002] In cement clinker production, cement kiln precalciners require pulverized coal burners. Currently, single-channel precalciner burners are suitable for the new dry process cement production line's precalciner operating requirements when coal quality is good. However, when coal quality is poor, volatile matter is low, or coal pulverizer fineness is coarse, incomplete combustion, low kiln raw meal decomposition rates, and fluctuating precalciner operating conditions often occur. These issues impact the safe and stable operation of the production system and cause fluctuations and declines in clinker product quality. The poor adaptability of these burners limits the scope of coal procurement for production, resulting in high-quality coal often in short supply and relatively high prices, hindering cement companies from further reducing energy costs in cement production.

[0003] The application of green electricity and green hydrogen continues to expand in the industrial sector, and cement companies have already demonstrated and explored the application of these technologies. However, simply adding hydrogen injection holes for direct combustion and using hydrogen as a fuel to replace coal with equivalent calorific value is difficult to achieve economically. Therefore, a high-efficiency hydrogen-blended burner for cement kiln precalciners is needed to address this issue. Summary of the Invention

[0004] The object of the present invention is to provide a high-efficiency hydrogen-doped burner for a cement kiln decomposition furnace, so as to solve the problems existing in the prior art mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-efficiency hydrogen-blended burner for a cement kiln decomposition furnace comprises a main body and an oxygen delivery pipe. A plurality of hydrogen channels are provided in the circumferential sidewall of the main body, and the hydrogen channels are evenly spaced around the circumference of the main body. The oxygen delivery pipe is provided inside the main body, and the axis of the oxygen delivery pipe coincides with the axis of the main body. A constriction is provided at the outlet end of the oxygen delivery pipe, and a pulverized coal channel is formed between the outer wall of the oxygen delivery pipe and the inner wall of the main body.

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

[0008] Preferably, the oxygen delivery tube is fixed inside the main pipe body via a connecting plate.

[0009] Preferably, the outlet of the pulverized coal channel is arranged straight, and guide vanes are provided inside the pulverized coal channel.

[0010] Preferably, the air inlet end of the main pipe is provided with a flange.

[0011] Preferably, the outlet end surfaces of the hydrogen channel, the oxygen delivery pipe and the pulverized coal channel are flush.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention introduces hydrogen and oxygen through a multi-channel design to form a combustion-promoting zone in the burner outlet area, which can solve the problem of poor adaptability of inferior coal and low-volatile coal in cement decomposition furnaces, improve the burnout rate of inferior coal, low-volatile coal and coarse coal powder, effectively improve fuel utilization efficiency, stabilize the decomposition furnace working conditions, and improve the operating stability of the cement clinker production system and the clinker production quality level.

[0014] 2. While improving the adaptability of coal used in decomposition furnaces, the present invention provides cement companies with more options for purchasing raw coal and using alternative fuels, which is beneficial to reducing energy (coal, alternative fuel) procurement costs, reducing cement clinker production costs, and improving the market competitiveness of production products.

[0015] 3. The present invention changes the existing application idea and status quo of direct hydrogen combustion that simply replaces coal from the calorific value perspective. Through a multi-channel structure, coal powder, hydrogen, and oxygen form a combustion-promoting zone in a small area of the burner outlet, which can effectively improve the thermal effect of coal combustion and alternative fuels with less hydrogen usage, effectively reduce the cost of hydrogen use, and achieve an organic integration of the economic application and carbon reduction effect of green hydrogen in cement plants.

[0016] 4. The present invention can prevent the situation where hydrogen combustion and coal powder combustion snatch oxygen from each other by setting up hydrogen channels and oxygen channels, thereby realizing the function of the combustion promotion zone in the burner outlet area, and effectively utilizing the oxygen generated by the water electrolysis hydrogen production system to avoid oxygen exhaustion and waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a right-side structural schematic diagram of the present invention.

[0019] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0020] Figure 4 For the present invention Figure 3 Schematic diagram of the AA cross-section structure.

[0021] In the figure: 1. Main body; 2. Hydrogen channel; 3. Hydrogen guide hole; 4. Oxygen delivery pipe; 5. Connecting plate; 6. Pulverized coal channel; 7. Flange. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] See also Figure 1-4 , the present invention provides the following technical solutions:

[0024] A high-efficiency hydrogen-blended burner for a cement kiln decomposition furnace comprises a main body 1 and an oxygen delivery pipe 4. The main body 1 has an air inlet end provided with a flange 7, which facilitates connection of the burner to a material and air supply pipeline. The main body 1 has a plurality of hydrogen channels 2 provided within its circumferential sidewall, the hydrogen channels 2 being equidistantly distributed around the main body 1. The outlet ends of the hydrogen channels 2 are provided with hydrogen guide holes 3, the axes of the hydrogen guide holes 3 being inclined relative to the axis of the main body 1, with the angle between the two axes being set at 10°-30°. The hydrogen guide holes 3 are provided to enable the output hydrogen to intersect with the oxygen jet line, forming a combustion-promoting zone, thereby ensuring more complete combustion of the hydrogen and oxygen mixture.

[0025] The oxygen delivery pipe 4 is arranged inside the main body 1 and is fixed to the inside of the main body 1 through 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 coal powder.

[0026] 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 arranged straight, and a guide vane is provided inside the pulverized coal channel 6. The outlet end faces of the hydrogen channel 2, the oxygen delivery pipe 4 and the pulverized coal channel 6 are flush; the pulverized coal channel 6 delivers the pulverized coal and simultaneously enters the combustion promotion zone where hydrogen and oxygen meet. The hydrogen and oxygen undergo a combustion reaction, which can quickly increase the temperature of the combustion promotion zone, accelerate the combustion speed of the pulverized coal, and improve the burnout rate of the pulverized coal.

[0027] When the burner is actually used, the oxygen delivery pipe 4, the pulverized coal channel 6, and the hydrogen channel 2 are independent of each other. The front end of the burner is connected to the corresponding delivery pipeline. Each delivery pipeline is respectively provided with a shut-off valve, a gate valve, or a flow regulating valve. Hydrogen blending and oxygen supply combustion can be selected according to the working conditions. The hydrogen blending and oxygen supply flow rates can be flexibly adjusted according to the quality of the pulverized coal, so that the pulverized coal combustion is more complete, the utilization rate of the pulverized coal is improved, and the quality of the product is guaranteed, while the procurement cost of the pulverized coal can be reduced. In addition, through the application of this burner, the amount of hydrogen required for hydrogen blending combustion can be greatly reduced, without the need to build an additional oxygen enrichment system, and the distributed photovoltaic and distributed wind power surplus electricity of cement production enterprises can be effectively utilized to carry out small-scale green hydrogen production. With a relatively low investment in hydrogen production by electrolysis of water, it helps to achieve a green transformation in cement clinker production.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency hydrogen-doped burner for a cement kiln decomposition furnace, characterized in that: The invention comprises a main body (1) and an oxygen delivery pipe (4), wherein a plurality of hydrogen channels (2) are provided in the circumferential side wall of the main body (1), and the hydrogen channels (2) are equidistantly distributed on the circumference of the main body (1); the oxygen delivery pipe (4) is provided inside the main body (1), and 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, and 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).

2. The high-efficiency hydrogen-doped burner for a cement kiln decomposition furnace according to claim 1, characterized in that: A hydrogen guide hole (3) is provided at the outlet end of the hydrogen channel (2), and the axis of the hydrogen guide hole (3) is tilted relative to the axis of the main body (1), and the angle between the two axes is set to 10°-30°.

3. The high-efficiency hydrogen-doped burner for a cement kiln decomposition furnace according to claim 1, characterized in that: The oxygen delivery pipe (4) is fixed inside the main pipe body (1) via a connecting plate (5).

4. The high-efficiency hydrogen-doped burner for a cement kiln decomposition furnace according to claim 1, characterized in that: The outlet of the pulverized coal channel (6) is arranged straight, and a guide vane is provided inside the pulverized coal channel (6).

5. The high-efficiency hydrogen-doped burner for a cement kiln calciner according to claim 1, characterized in that: The air inlet end of the main pipe (1) is provided with a flange (7).

6. The high-efficiency hydrogen-doped burner for a cement kiln calciner according to claim 1, characterized in that: The outlet end surfaces of the hydrogen channel (2), the oxygen delivery pipe (4) and the pulverized coal channel (6) are flush.

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