Cement kiln cyclone combustion device and method suitable for various energy sources

Abstract

The invention relates to the technical field of energy sources and building materials, and provides a cement kiln cyclone combustion device and method suitable for various energy sources. An air inlet, a raw material inlet and a fuel inlet are formed in the shell; high-temperature air is introduced into the combustion chamber through the air inlet and rotational flow is formed; undecomposed raw materials are introduced into the combustion chamber through the raw material inlet, and under the action of rotational flow, the undecomposed raw materials form a material curtain on the inner wall of the combustion chamber; fuel is introduced into the combustion chamber through the fuel inlet. The central combustor extends into the combustion chamber from the central position of the top of the shell; the connecting cylinder is used for communicating the combustion chamber with the cement kiln main decomposing furnace. According to the invention, the vortex of flue gas-air flow is utilized to generate a stable cyclone, so that the cyclone is expanded to a proper combustion space, and the cyclone combustion utilizes the characteristics of rotating air flow to guide fuel and raw material particles to move. A stable circulation area with high thermal strength can be generated in the center in the furnace, and the combustion process and the heat exchange process between materials are strengthened.

Description

Technical Field

[0001] The present invention relates to the technical fields of energy and building materials, and in particular to a cement kiln cyclone combustion device and method applicable to multiple energy sources. Background Art

[0002] At present, the cement industry has a large carbon emissions, second only to the power and steel industries. In the production process of traditional portland clinker, carbon dioxide generated by fuel combustion accounts for about 33% of the total carbon emissions, carbon dioxide generated by raw material decomposition accounts for about 60%, and carbon emissions from other processes are about 7%. In order to reduce the carbon dioxide emissions of cement kilns, carbon reduction is usually carried out through means such as energy efficiency improvement, raw material substitution, fuel substitution, oxy-fuel / oxy-fuel combustion, carbon capture and storage. Replacing currently widely used fossil fuels with zero-carbon new energy directly reduces 33% of the fuel carbon emissions in cement clinker production, which is currently the fastest, lowest-cost, and most direct carbon reduction method. Zero-carbon new energy includes: various alternative fuels such as biomass and industrial solid waste; various new energy sources that can replace fossil fuels such as hydrogen energy, electric energy, and concentrated solar energy.

[0003] Regarding combustion devices based on biomass and industrial solid waste alternative fuels, a large number of pre-combustion furnace devices in the forms of rotary kilns, grate furnaces, fixed beds, cyclone beds, circulating fluidized beds, etc. have been publicly disclosed. However, the above devices mainly focus on extending the residence time of materials and increasing the turbulence degree according to the material characteristics. Limited by the furnace thermal load and refractory performance, the combustion temperature is generally not high, which in turn affects the combustion heat utilization efficiency.

[0004] Regarding combustion devices based on hydrogen, the thermal load is low, the thermal energy utilization rate is low, and the refractory erosion is serious.

[0005] Therefore, how to provide a cement kiln cyclone combustion device and method applicable to multiple energy sources, which can overcome the problems provided above in the prior art. Summary of the Invention

[0006] The present invention provides a cement kiln cyclone combustion device and method applicable to multiple energy sources, which are used to solve the defects of low thermal load, low thermal energy utilization rate, and refractory erosion in the prior art, and achieve strengthened combustion, improved combustion conditions, and increased combustion reaction heat rate.

[0007] The present invention provides a cement kiln cyclone combustion device applicable to multiple energy sources, including: A housing with a combustion chamber inside; An air inlet provided on the housing, and the air inlet is used to introduce high-temperature air into the combustion chamber and form a swirl, wherein the high-temperature air is greater than 900 °C; The raw material inlet is provided on the housing. The raw material inlet is used to introduce uncalcined raw materials into the combustion chamber. Under the action of the swirl flow, the uncalcined raw materials form a material curtain on the inner wall of the combustion chamber. The fuel inlet is provided on the housing. The fuel inlet is used to introduce fuel into the combustion chamber. The central burner extends from the central position at the top of the housing into the combustion chamber. The connecting cylinder is in the shape of a hollow cylinder and is connected to the bottom end of the housing. The connecting cylinder is used to connect the combustion chamber and the main decomposing furnace of the cement kiln.

[0008] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, the connecting cylinder includes: The column section is connected to the bottom end of the housing, and the column section is arranged perpendicular to the horizontal plane. The connecting section, the top end of which is connected to the bottom end of the column section, and the bottom end of which is connected to the main decomposing furnace of the cement kiln. And the connecting section is inclined.

[0009] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, the fuel inlet is further provided on the side surface of the column section.

[0010] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, the connecting section includes: The first connecting part is connected to the column section. The second connecting part is inclined, and the second connecting part is rectangular.

[0011] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, a first platform is arranged on the inner side of the second connecting part, and a plurality of air cannons are arranged on the side wall of the second connecting part, and the air cannons are located downstream of the first platform.

[0012] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, the longitudinal section of the inner surface of the first connecting part is semi-circular or parabolic and is lined with an infrared reflection heat preservation layer.

[0013] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, a second platform is arranged at the connection of the second connecting part and the main decomposing furnace of the cement kiln.

[0014] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, the fuel inlet is arranged close to the air inlet.

[0015] According to a cement kiln cyclone combustion device applicable to multiple energy sources provided by the present invention, the air inlet includes 1-4.

[0016] The present invention also provides a cyclone combustion method for a cement kiln applicable to multiple energy sources, including: Introducing high-temperature air into the combustion chamber through an air inlet to form a swirl; Introducing uncalcined raw materials into the combustion chamber through a raw material inlet, and under the action of the swirl, the uncalcined raw materials form a material curtain on the inner wall of the combustion chamber; Introducing fuel into the combustion chamber through a fuel inlet; The energy entering the combustion chamber through the central burner and other fuel inlets burns and releases heat in the high-temperature air. The uncalcined raw materials are heated up and partially decomposed under the action of the fuel and the swirl, obtaining preheated raw materials; Transmitting the preheated raw materials to the main decomposition furnace of the cement kiln through a connecting cylinder.

[0017] The cyclone combustion device and method for a cement kiln applicable to multiple energy sources provided by the present invention introduce high-temperature air into the combustion chamber through an air inlet to form a swirl, introduce uncalcined raw materials into the combustion chamber through a raw material inlet, and under the action of the swirl, the uncalcined raw materials form a material curtain on the inner wall of the combustion chamber to protect the refractory lining material of the combustion chamber; introduce fuel energy into the combustion chamber through a fuel inlet and a central burner, burn and release heat in the high-temperature air; the uncalcined raw materials are heated up and partially decomposed under the action of the fuel and the swirl, obtaining preheated raw materials; transmit the preheated raw materials to the main decomposition furnace of the cement kiln through a connecting cylinder; utilize the eddy current of the flue gas-air flow to create a stable swirl cyclone that can be controlled within a large range, expand it into an appropriate combustion space, and the cyclone combustion is between the torch combustion and the layer combustion process. Utilize the characteristics of the rotating air flow to guide the fuel particles to move. A stable circulation area with a very high thermal intensity will be generated in the center of the furnace, which plays a decisive role in fuel gasification and mixing, and accelerates the slowest stage in the fuel combustion process.

[0018] Therefore, for the cyclone combustion device and method for a cement kiln applicable to multiple energy sources provided by the present invention, combustion and heat transfer are strengthened in the combustion chamber, the combustion condition is improved, the excess air coefficient can be reduced to 1.05 - 1.10, thereby improving the combustion reaction efficiency; and the formation of the material curtain protects the refractory lining material of the combustion chamber. Through the above settings, the temperature of the combustion chamber can reach above 1700 °C, with a large turbulence intensity and a high burnout degree. Under the complete combustion condition, the carbon monoxide content in the tail gas is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of the combustion device provided by the present invention.

[0021] Figure 2 is Figure 1 the schematic diagram of a-a in

[0022] Figure 3 is Figure 1 the schematic diagram in the direction of A in

[0023] Figure 4 It is a schematic top view of the combustion device provided by the present invention.

[0024] Reference numerals: 1. Housing; 2. Air inlet; 3. Raw material inlet; 4. Fuel inlet; 5. Central burner; 6. Connecting cylinder; 61. Column section; 62. Connecting section; 621. First connecting part; 622. Second connecting part; 7. Air cannon; 8. Second platform. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0027] The following will be combined with Figures 1 - 4A cement kiln cyclone combustion device applicable to multiple energy sources according to the present invention includes a housing 1, a central burner 5, and a connecting cylinder 6.

[0028] The housing 1 has a hollow interior and serves as a combustion chamber. An air inlet 2, a raw meal inlet 3, and a fuel inlet 4 are provided on the housing 1. Among them, the air inlet 2 is used to introduce high-temperature air into the combustion chamber and form a swirl, enhancing the air flow in the combustion chamber, making the fuel and air mix more evenly, thereby improving the combustion efficiency. Among them, the high-temperature air is greater than 900 °C. The raw meal inlet 3 is used to introduce uncalcined raw meal into the combustion chamber, and under the action of the swirl, the uncalcined raw meal forms a material curtain on the inner wall of the combustion chamber, enabling the uncalcined raw meal to fully utilize the high-temperature environment of the combustion chamber for preheating, improving the heat exchange efficiency; moreover, the material curtain can also be used to protect the refractory lining in the combustion chamber and reduce the erosion of the refractory. Through flow field analysis, the uncalcined raw meal can quickly absorb heat and reduce the temperature of the furnace inner wall.

[0029] The fuel inlet 4 is used to introduce fuel into the combustion chamber. The central burner 5 extends from the central position at the top of the housing 1 into the combustion chamber. Among them, pulverized coal, hydrogen, plasma torches, concentrated solar energy, etc. can enter the combustion chamber from the position of the central burner 5. Its characteristics are that the central swirl is sufficient, which is conducive to combustion, the radiant energy is fully utilized, and the thermal efficiency is high.

[0030] And alternative fuels such as biomass enter the combustion chamber through the fuel inlet 4. The fuel inlet 4 can be arranged close to the air inlet 2 according to the fuel combustion characteristics, or can be located on the side wall of the combustion chamber.

[0031] Therefore, according to different energy characteristics, different energy sources are introduced at different positions, which is applicable to a variety of alternative fuels.

[0032] In addition, the height of the central burner 5 is adjustable, and the temperature distribution in the combustion chamber is controlled by adjusting the insertion depth.

[0033] The connecting cylinder 6 is in a cylindrical shape with a hollow interior and is connected to the bottom end of the housing 1; the connecting cylinder 6 is used to connect the combustion chamber and the main decomposition furnace of the cement kiln.

[0034] The cyclone combustion device applicable to multiple energy sources provided by the present invention utilizes the eddy current of the flue gas-air flow to create a stable and controllable swirling air current within a large range, expanding it into an appropriate combustion space. The cyclone combustion lies between the torch combustion and the grate combustion processes and utilizes the characteristics of the rotating air current to guide the fuel particles to move. A stable circulation area with a very high thermal intensity will be generated in the center of the furnace, which plays a decisive role in fuel gasification and mixing and accelerates the slowest stage in the fuel combustion process. Therefore, the present invention strengthens the combustion, improves the combustion conditions, and the excess air coefficient can be reduced to 1.05 - 1.10, thereby increasing the thermal efficiency of the combustion reaction. Additionally, the reaction center temperature is above 1700°C, the turbulence intensity is high, and the burnout degree is high. Under the complete combustion condition, the CO content in the tail gas is low. For heat sources such as hydrogen energy, plasma torches, and concentrated solar energy, it has the characteristics of high heat exchange efficiency, large heat exchange surface, high utilization rate of thermal radiation, and low surface temperature of the furnace body. For light combustible materials, it has the characteristics of high temperature, high turbulence degree, and controllable excess air coefficient.

[0035] As Figure 1 shown, in a feasible embodiment of the present invention, the connecting cylinder 6 includes a column section 61 and a connecting section 62. The column section 61 is connected to the bottom end of the housing 1, and the column section 61 is perpendicular to the horizontal plane, ensuring a stable connection between the combustion chamber and the connecting cylinder 6. The top end of the connecting section 62 is connected to the bottom end of the column section 61, and the bottom end of the connecting section 62 is connected to the main decomposition furnace of the cement kiln. The connecting section 62 forms a transition section from the combustion chamber to the main decomposition furnace of the cement kiln, providing a residence time for the further combustion of the unburned materials in the combustion chamber. The connecting section 62 is inclined, which helps to guide the heat generated by combustion and the decomposition products to flow more smoothly into the main decomposition furnace of the cement kiln, and the inclination angle can be adjusted according to actual needs to achieve the best flow effect.

[0036] Referring again to Figure 1 shown, in a feasible embodiment of the present invention, a fuel inlet 4 is further provided on the side surface of the column section 61. According to the burnout characteristics of the alternative fuel, the alternative fuel enters the combustion chamber through the horizontal conveying device.

[0037] As Figure 1 and Figure 2 shown, in a feasible embodiment of the present invention, the connecting section 62 can be circular, rectangular, or a combined shape of the two. The connecting section 62 includes a first connecting portion 621 and a second connecting portion 622. The first connecting portion 621 is connected to the column section 61; the second connecting portion 622 is inclined, preferably with an inclination angle of more than 65°, to avoid material accumulation. The cross-section of the second connecting portion 622 is rectangular, enabling the material to have a large-area contact with the inclined surface and extending the residence time.

[0038] As Figure 1 and Figure 3As shown, in a feasible embodiment of the present invention, further, a first platform is provided inside the second connecting portion 622, and a plurality of air cannons 7 are provided on the side wall of the second connecting portion 622, and the air cannons 7 are located downstream of the first platform. The setting of the air cannons 7 further provides the residence time of the material.

[0039] In a feasible embodiment of the present invention, the longitudinal section of the inner surface of the first connecting portion 621 is semi-circular or parabolic, and is lined with an infrared reflection heat preservation layer to further focus the radiant heat in the flue gas on the second connecting portion 622, improve the material combustion temperature, and shorten the burnout time.

[0040] Refer to again Figure 1 As shown, in a feasible embodiment of the present invention, a second platform 8 is provided at the connection between the second connecting portion 622 and the main decomposition furnace of the cement kiln to further improve the burnout of high-density and large-particle materials, and is equipped with air cannons 7 to prevent material accumulation.

[0041] By making full use of the first connecting portion 621 and the second connecting portion 622, the burnout of high-density and large-particle materials is improved.

[0042] As Figure 4 As shown, in a feasible embodiment of the present invention, the fuel inlet 4 is arranged close to the air inlet 2, which is convenient for the light combustible alternative fuel to rotate fully in the combustion chamber, extend the residence time, and improve the burnout rate.

[0043] In a feasible embodiment of the present invention, the air inlet 2 includes 1-4, as long as it can provide swirl in the combustion chamber, and can be freely adjusted according to the situation.

[0044] The cement kiln cyclone combustion device provided by the present invention applicable to multiple energy sources is relative to the traditional cement kiln decomposition furnace 160,000 - 340,000 kcal / (m 3 .h), the grate furnace 100,000 - 300,000 kcal / (m 3 .h), the rotary incinerator 10,000 - 250,000 kcal / (m 3.h), the volumetric heat load of the cyclone combustion reactor is 6 - 9 times that of the decomposition furnace of the cement kiln, 10 times that of the grate furnace, and 10 - 100 times that of the rotary incinerator. This means that under the same fuel load, the cyclone combustion reaction device has a smaller volume, a higher outlet temperature, and a higher thermal efficiency. The combustion is intensified, the combustion condition is improved, and the excess air coefficient can be reduced to 1.05 - 1.10, thereby improving the thermal efficiency of the combustion reaction; the central temperature of the cyclone combustion reactor reaches above 1700 °C, with a large turbulence intensity and a high burnout degree. Under the complete combustion condition, the CO content in the tail gas is low. Through targeted design, for heat sources such as hydrogen energy, plasma torches, and concentrated solar energy, it has the characteristics of high heat transfer efficiency, large heat transfer surface, high utilization rate of thermal radiation, and low surface temperature of the furnace body; for light combustible materials, it has the characteristics of high temperature, large turbulence degree, and controllable excess air coefficient; for high-density large-particle materials, it has the characteristics of high-temperature preheating, effectively extending the residence time, and improving the burnout degree.

[0045] An embodiment of the second aspect of the present invention lies in providing a cyclone combustion method for a cement kiln applicable to multiple energy sources, which is realized by using the device as described above, and includes: S1. Introduce high-temperature air into the combustion chamber through the air inlet 2 to form a swirl, where the temperature of the high-temperature air is greater than 900 °C.

[0046] The existence of the swirl enhances the mixing effect of air and fuel, making the combustion more sufficient and uniform.

[0047] S2. Introduce the undecarbonized raw meal into the combustion chamber through the raw meal inlet 3, and under the action of the swirl, the undecarbonized raw meal forms a material curtain on the inner wall of the combustion chamber.

[0048] The formed material curtain is used to protect the inner lining refractory material in the combustion chamber. In this step, the raw meal can quickly absorb heat and descend, using the high-temperature environment of the combustion chamber to preheat the cold raw meal, improving the heat exchange efficiency.

[0049] S3. Introduce fuel into the combustion chamber through the fuel inlet 4.

[0050] The fuel provides the necessary energy for the combustion process.

[0051] S4. Introduce energy sources such as pulverized coal, natural gas, hydrogen energy, plasma torches, and concentrated solar energy through the central burner 5. The undecarbonized raw meal burns under the action of the fuel and the swirl to obtain preheated raw meal. Here, the central burner can be a traditional solid or gas fuel burner, or a plasma torch using electric energy or a concentrated solar energy incident concentrator system.

[0052] The central burner 5 is located at the top center of the combustion chamber. During the fuel combustion process, the swirl continues to play a role, making the combustion more complete. At the same time, the uncalcined raw meal is gradually preheated under the action of the high temperature and swirl generated by the fuel combustion, preparing for the subsequent decomposition process.

[0053] S5. The preheated raw meal is conveyed to the main precalciner of the cement kiln through the connecting cylinder 6.

[0054] The preheated raw meal is conveyed to the main precalciner of the cement kiln through the connecting cylinder 6. The connecting cylinder 6 ensures the smooth conveyance of the raw meal and reduces heat loss. In the precalciner of the cement kiln, the preheated raw meal is further decomposed, providing the necessary raw materials for the cement production process.

[0055] The cement kiln cyclone combustion method applicable to multiple energy sources provided by the present invention can strengthen combustion, improve the combustion condition, and increase the combustion reaction efficiency.

[0056] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0057] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or mode are included in at least one embodiment or mode of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or modes. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or modes described in this specification and the features of different embodiments or modes.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cement kiln cyclone combustion device suitable for multiple energy sources, characterized in that: include: A housing (1) having a combustion chamber therein; An air inlet (2) is provided on the shell (1), and the air inlet (2) is used to introduce high-temperature air into the combustion chamber to form a swirl, wherein the high-temperature air is greater than 900° C.; A raw meal inlet (3) is provided on the shell (1), and the raw meal inlet (3) is used to introduce undecomposed raw meal into the combustion chamber, and under the action of the swirl flow, the undecomposed raw meal forms a material curtain on the inner wall of the combustion chamber; A fuel inlet (4) is provided on the housing (1), and the fuel inlet (4) is used to introduce fuel into the combustion chamber; A central burner (5) extending from the top center of the shell (1) into the combustion chamber; The connecting tube (6) is in the shape of a tube with a hollow interior and is connected to the bottom end of the shell (1); the connecting tube (6) is used to connect the combustion chamber and the main calciner of the cement kiln.

2. The cement kiln cyclone combustion device applicable to multiple energy sources according to claim 1 is characterized in that: The connecting cylinder (6) comprises: A column section (61) connected to the bottom end of the housing (1), and the column section (61) is arranged perpendicular to a horizontal plane; The top end of the connecting section (62) is connected to the bottom end of the column section (61), and the bottom end of the connecting section (62) is connected to the main calcining furnace of the cement kiln; and the connecting section (62) is arranged obliquely.

3. The cement kiln cyclone combustion device applicable to multiple energy sources according to claim 2 is characterized in that: The fuel inlet (4) is also provided on the side of the column section (61).

4. The cement kiln cyclone combustion device applicable to multiple energy sources according to claim 2 is characterized in that: The connecting section (62) comprises: A first connecting portion (621) connected to the column segment (61); The second connection portion (622) is arranged obliquely, and the second connection portion (622) is rectangular.

5. The cement kiln cyclone combustion device applicable to multiple energy sources according to claim 4 is characterized in that: A first platform is arranged on the inner side of the second connecting portion (622), a plurality of air cannons (7) are arranged on the side wall of the second connecting portion (622), and the air cannons (7) are located downstream of the first platform.

6. The cement kiln cyclone combustion device applicable to multiple energy sources according to claim 4 is characterized in that: The longitudinal cross-section of the inner surface of the first connecting portion (621) is semicircular or parabolic, and is lined with an infrared reflective heat-insulating layer.

7. The cement kiln cyclone combustion device applicable to multiple energy sources according to claim 4 is characterized in that: A second platform (8) is provided at the junction of the second connecting portion (622) and the main calcining furnace of the cement kiln.

8. The cement kiln cyclone combustion device applicable to multiple energy sources according to claim 1 is characterized in that: The fuel inlet (4) is arranged close to the air inlet (2).

9. The cement kiln cyclone combustion device applicable to multiple energy sources according to any one of claims 1 to 8, characterized in that: The air inlets (2) include 1 to 4.

10. A cement kiln cyclone combustion method applicable to multiple energy sources, characterized in that: include: High-temperature air is introduced into the combustion chamber through the air inlet (2) to form a swirling flow; Introducing undecomposed raw meal into the combustion chamber through the raw meal inlet (3), and under the action of the swirl flow, the undecomposed raw meal forms a material curtain on the inner wall of the combustion chamber; The fuel is introduced into the combustion chamber through the fuel inlet (4) and burns rapidly in the high-temperature wind; Pulverized coal, natural gas, hydrogen energy, plasma torch or concentrated solar energy is introduced through a central burner (5) to burn and release heat in high-temperature wind, and the undecomposed raw meal is heated and partially decomposed under the action of the energy and the swirl flow to obtain preheated raw meal; The preheated raw meal is transferred to the main calciner of the cement kiln through the connecting tube (6).

Images