Hydrogen burner for decomposing furnace in cement clinker production line
By designing a hydrogen burner for cement clinker production line, the multi-channel structure and hydrogen flow rate at different ejection angles are used to achieve stable flame and diffusion in high-temperature areas, solving the problem of difficulty in achieving safe and stable hydrogen doping operation in the cement industry and reducing CO2 emissions.
Patent Information
- Application Number
- CN202420420098.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-05
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-03-05
AI Technical Summary
The lack of mature hydrogen burners for cement clinker production lines in the prior art makes it difficult for the cement industry to achieve safe and stable hydrogen operation, which in turn affects the realization of the carbon reduction and carbon reduction target.
A hydrogen burner for decomposition furnaces in cement clinker production line is designed, and the structure of flange interface, central channel, inner ring channel and outer ring channel is adopted. The hydrogen is sprayed out at different angles and flow rates to form a complex flame structure to achieve flame stability and diffusion in high-temperature areas.
The burner can effectively replace coal powder combustion, reduce CO2 emissions in the cement industry, maintain the flame stability, prevent burning of the burner, and protect the burner head through internal circulation.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrogen burners, in particular to a hydrogen burner used in a decomposition furnace in a cement clinker production line. Background Art
[0002] China is the world's largest cement producer, and cement production is still on an upward trend. With the increase in cement production, carbon emissions in the cement industry are also rising year by year, reaching a historical high of 1.384 billion tons in 2020. According to the 2015 Paris Agreement, the global cement industry must achieve the goal of carbon neutrality by 2050 and a 40% carbon reduction target by 2030, which has an important impact on the carbon reduction work of the cement production industry.
[0003] 35% of carbon emissions in cement production come from coal, of which 60% are in the decomposition furnace and 40% are in the calcining kiln. Hydrogen energy can provide large-scale, stable and reliable carbon-free alternative fuels through green electricity hydrogen production to help cement companies achieve carbon reduction goals. Due to the high cost of hydrogen, complex cement kiln working conditions, and special on-site environment at this stage, there is currently no mature hydrogen burner for cement clinker production lines on the market, which provides technical support for the safe and stable hydrogen blending operation of cement clinker production lines. Utility Model Content
[0004] The purpose of the utility model is to provide a hydrogen burner for a decomposition furnace in a cement clinker production line to solve the above-mentioned defects caused by the prior art.
[0005] A hydrogen burner for a decomposition furnace in a cement clinker production line comprises a flange interface, a central channel, an inner ring channel and an outer ring channel, wherein:
[0006] The central channels are provided with a plurality of channels and are evenly distributed at the center of the flange interface. The hydrogen in the central channel is ejected at an angle of 2° to the outside, with a flow rate of 280-320 m / s, and a reflux is formed. The ejected hydrogen accounts for ±10% of the total hydrogen amount;
[0007] The inner ring channel is provided with a plurality of channels which are evenly distributed on the periphery of the central channel. The hydrogen in the inner ring channel is ejected in a ring shape at an inner angle of 15°, with a flow rate of 280-320 m / s, and the flame thickness is adjustable. The ejected hydrogen accounts for ±25% of the total hydrogen amount;
[0008] The outer ring channels are provided with a plurality of channels which are evenly distributed on the periphery of the inner ring channel. The hydrogen in the outer ring channel flows out in a direct injection manner with a flow rate of 300-350 m / s, and the flame length is adjustable. The ejected hydrogen accounts for ±65% of the total hydrogen amount.
[0009] Preferably, the central channel, the inner ring channel and the outer ring channel are commonly connected to a hydrogen channel.
[0010] Preferably, the flange interface, central channel, inner ring channel and outer ring channel are all made of high temperature resistant and corrosion resistant stainless steel or metal alloy.
[0011] Preferably, the outer periphery of the outer ring channel is covered with a high temperature resistant casting material.
[0012] Compared with the prior art, the utility model has the following advantages:
[0013] This utility model patent can be used in the decomposition furnace of cement clinker production line. It is made of high temperature resistant and corrosion resistant (including hydrogen corrosion) stainless steel or metal alloy, and is protected by high temperature resistant castables around. It can effectively replace coal powder combustion and reduce CO2 emissions in the cement industry. The burner takes measures to stabilize the flame during the combustion process. The flow rate can be adjusted steplessly in three channels, and the high temperature area can be diffused to suppress the occurrence of local over-temperature. The central hydrogen flows out quickly, forming an internal circulation, which plays a role in protecting the burner head and preventing burning. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.
[0015] Figure 2 It is a structural schematic diagram of the central channel in the utility model.
[0016] Figure 3 It is a structural schematic diagram of the inner ring channel in the utility model.
[0017] Figure 4 It is a structural schematic diagram of the outer ring channel in the utility model.
[0018] Figure 5 It is a structural schematic diagram of the burner and related accessories in the utility model.
[0019] in:
[0020] 10-flange interface; 11-center channel; 12-inner ring channel; 13-outer ring channel; 14-hydrogen channel; 14a-nitrogen inlet; 15-casting material; 16-flame arrester; 17-check valve. DETAILED DESCRIPTION
[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.
[0022] like Figures 1 to 5 As shown, a hydrogen burner for a decomposition furnace in a cement clinker production line comprises a flange interface 10, a central channel 11, an inner ring channel 12 and an outer ring channel 13, wherein:
[0023] The central channels 11 are provided with a plurality of channels and are evenly distributed at the center of the flange interface 10. The hydrogen in the central channel 11 is ejected at an angle of 2° to the outside, with a flow rate of 280-320 m / s, and a reflux can be formed. The ejected hydrogen accounts for ±10% of the total hydrogen amount. The above design can protect the burner head and expand the burner combustion range.
[0024] The inner ring channel 12 is provided with a plurality of channels and is evenly distributed on the periphery of the central channel 11. The hydrogen in the inner ring channel 12 is ejected in a ring shape at an inner angle of 15°, with a flow rate of 280-320 m / s, and the flame thickness is adjustable, and the ejected hydrogen accounts for ±25% of the total hydrogen amount; the above design can disperse the high temperature points to a certain extent, reduce the temperature of the highest high temperature point, and reduce the impact of local high temperature;
[0025] The outer ring channel 13 is provided with a plurality of channels and is evenly distributed around the inner ring channel 12. The hydrogen in the outer ring channel 13 flows out in a direct injection manner with a flow rate of 300-350 m / s, and the flame length is adjustable, and the ejected hydrogen accounts for ±65% of the total hydrogen. The above design can generally maintain the burner flame stability.
[0026] In this embodiment, the central channel 11, the inner ring channel 12 and the outer ring channel 13 are connected to a hydrogen channel 14. The hydrogen channel 14 can provide hydrogen to the central channel 11, the inner ring channel 12 and the outer ring channel 13.
[0027] In this embodiment, the flange interface 10, the central channel 11, the inner ring channel 12 and the outer ring channel 13 are all made of high temperature resistant and corrosion resistant stainless steel or metal alloy. The above design can generally extend the service life of the burner.
[0028] In this embodiment, the outer ring channel 13 is covered with a high temperature resistant casting material 15. The casting material 15 can protect the structures distributed around the burner.
[0029] In this embodiment, the hydrogen channel 14 is connected with a flame arrester 16 and a one-way valve 17, and a nitrogen inlet 14a is provided on the side of the hydrogen channel 14. Nitrogen is introduced into the hydrogen channel 14 through the nitrogen inlet 14a to purge the hydrogen channel 14 and prevent flashback; the flame arrester 16 extinguishes the flame in the event of flashback in special circumstances; and the one-way valve 17 prevents the backflow of air, nitrogen, etc.
[0030] Working principle of hydrogen burner for decomposition furnace in this cement clinker production line:
[0031] The hydrogen burner is composed of a central channel 11, an inner ring channel 12 and an outer ring channel 13, into which hydrogen is introduced and ejected at different flow rates, thereby reducing local high temperature to a certain extent.
[0032] The hydrogen in the central channel 11 is ejected at an angle of 2° outward with a velocity of 280-320 m / s, which can form a backflow, protect the burner head, and diffuse the burner combustion range. The ejected hydrogen accounts for about 10% of the total hydrogen.
[0033] The hydrogen in the inner ring channel 12 is ejected in a circular shape at an angle of 15°, with a flow rate of 280-320m / s. The thickness of the flame can be adjusted, and it can disperse the high-temperature points to a certain extent, reduce the temperature of the highest high-temperature point, and reduce the impact of local high temperature. The ejected hydrogen accounts for about 25% of the total hydrogen.
[0034] The hydrogen in the outer ring channel 13 flows out in a direct injection manner with a flow rate of 300-350m / s, which generally keeps the burner flame stable and can adjust the flame length. The amount of hydrogen sprayed accounts for about 65% of the total hydrogen.
[0035] Therefore, the embodiments disclosed above are only illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.
Claims
1. A hydrogen burner for a decomposition furnace in a cement clinker production line, characterized in that: It comprises a flange interface (10), a central channel (11), an inner ring channel (12) and an outer ring channel (13), wherein: The central channels (11) are provided in a plurality and are evenly distributed at the center of the flange interface (10). The hydrogen in the central channel (11) is ejected at an angle of 2° to the outside, with a flow rate of 280-320 m / s, and a reflux is formed. The ejected hydrogen accounts for ±10% of the total hydrogen amount. The inner ring channel (12) is provided with a plurality of channels which are evenly distributed on the periphery of the central channel (11). The hydrogen in the inner ring channel (12) is ejected in a circular shape at an inner angle of 15°, with a flow rate of 280-320 m / s, and the flame thickness is adjustable. The ejected hydrogen accounts for ±25% of the total hydrogen amount. The outer ring channel (13) is provided with a plurality of channels which are evenly distributed on the periphery of the inner ring channel (12). The hydrogen in the outer ring channel (13) flows out in a direct injection manner with a flow rate of 300-350 m / s, and the flame length is adjustable. The ejected hydrogen accounts for ±65% of the total hydrogen amount.
2. The hydrogen burner for a decomposition furnace in a cement clinker production line according to claim 1, characterized in that: The central channel (11), the inner ring channel (12) and the outer ring channel (13) are commonly connected to a hydrogen channel (14).
3. The hydrogen burner for a decomposition furnace in a cement clinker production line according to claim 1, characterized in that: The flange interface (10), the central channel (11), the inner ring channel (12) and the outer ring channel (13) are all made of high temperature resistant and corrosion resistant stainless steel or metal alloy.
4. The hydrogen burner for a decomposition furnace in a cement clinker production line according to claim 1, characterized in that: The outer ring channel (13) is sheathed with a high temperature resistant casting material (15) on its periphery.