Combustion device of a fuel complementary system

Abstract

The present invention relates to the field of cement clinker production equipment, specifically a combustion device of a fuel complementary system, comprising a furnace body, the furnace body is provided with a feeding mechanism for materials and fuel to enter; the feeding mechanism comprises a feeding component for material delivery and a feeding component for fuel delivery; the furnace body is connected with an air inlet duct for tertiary air to enter; the delivery component comprises a delivery pipe arranged on the furnace body for material delivery; the feeding component comprises a coal powder feeding pipe and a biomass fuel feeding pipe. The present invention discloses a combustion device of a fuel complementary system, which can realize the supply of multiple fuels to the furnace body through the optimization of the feeding mechanism, and can well solve the problem of easy crusting on the inner wall of the furnace body in the industry; at the same time, it can meet the large-scale production of cement clinker, save resources, reduce production costs, and realize the reduction and harmless disposal of biomass fuels such as straw.

Description

Technical Field

[0001] The invention relates to the field of cement clinker production equipment, in particular to a combustion device of a fuel complementary system. Background Art

[0002] The cement industry is a major consumer of coal resources, accounting for about 10% of the country's total coal consumption. As a major agricultural country, China is rich in biomass fuel resources such as straw.

[0003] Biomass fuel replaces traditional coal fuel in cement kilns, with the advantages of less pollution after combustion, ash blending into cement production, and reduced emissions. It is an effective way to promote the "low carbon, environmental protection, and emission reduction" of the cement industry and promote the efficient and comprehensive utilization of straw.

[0004] However, due to the low calorific value of straw, the substitution rate is low and the combustion stability of cement kilns is poor. At the same time, the alkaline substances in the straw cause crusting in the decomposition furnace, affecting the operation of the production line. Although straw biomass fuel has been gradually used in my country's power industry, its application in cement plants is immature.

[0005] Therefore, it has become the main development trend of biomass alternative fuels in the cement industry to carry out key technology research on the in-depth integration and utilization of straw biomass in the high-energy consumption cement industry and develop new biomass alternative fuel combustion equipment. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a new combustion device that can realize the supply of multiple fuels.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A combustion device of a fuel complementary system comprises a furnace body, on which a feeding mechanism for material and fuel is provided; the feeding mechanism comprises a feeding component for material feeding and a feeding component for fuel feeding; the furnace body is connected to an air inlet duct for tertiary air to enter; the feeding component comprises a feeding pipe arranged on the furnace body for material feeding; the feeding component comprises a coal powder feeding pipe and a biomass fuel feeding pipe.

[0009] The delivery pipeline is provided with a material delivery channel, the pulverized coal feed pipeline is provided with a pulverized coal delivery channel; the biomass fuel feed pipeline is provided with a biomass delivery channel; the center lines of the material delivery channel, the pulverized coal delivery channel and the biomass delivery channel are arranged to intersect.

[0010] The pulverized coal feed pipeline and the biomass fuel feed pipeline are distributed on both sides of the delivery pipeline.

[0011] The biomass fuel feed pipeline is arranged close to the delivery pipeline; the angle between the horizontal projection of the biomass fuel feed pipeline and the delivery pipeline is in the range of 10°-30°.

[0012] The angle between the horizontal projections of the pulverized coal feeding pipeline and the delivery pipeline is in the range of 30°-60°.

[0013] The air inlet duct is located below the feeding mechanism.

[0014] The air inlet duct is arranged obliquely, and the air inlet duct is arranged close to the material delivery duct; the air inlet duct is opened at one end close to the furnace body and extends toward the biomass fuel feeding duct in the adjacent feeding mechanism.

[0015] The lower ends of the coal powder delivery channel and the biomass fuel delivery channel are on the same plane; the plane where the lower end of the material delivery channel is located is higher than the plane where the lower ends of the coal delivery channel and the biomass fuel delivery channel are located.

[0016] The combustion device is provided with a plurality of feeding mechanisms, and each feeding component is evenly distributed on the furnace body.

[0017] The air inlet duct is provided with a flow regulating valve; the tertiary air enters the furnace body through the air inlet duct, and the tertiary air entering the furnace body first contacts the material and then contacts the biomass fuel.

[0018] The advantages of the present invention are:

[0019] The invention discloses a combustion device of a fuel complementary system. By optimizing a feeding mechanism, the invention can supply a variety of fuels to a furnace body, and can well solve the problem of easy crusting on the inner wall of the furnace body in the industry; at the same time, it can meet the large-scale production of cement clinker, save resources, reduce production costs, and achieve the reduction and harmless disposal of biomass fuels such as straw. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0021] Figure 1 It is the front view of the present invention.

[0022] Figure 2 It is a cross-sectional view along AA of the present invention.

[0023] The marks in the above figure are:

[0024] 1. Furnace body, 2. Feeding pipe, 3. Coal powder feeding pipe, 4. Biomass fuel feeding pipe, 5. Air inlet pipe. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0026] A combustion device of a fuel complementary system comprises a furnace body 1, on which a feeding mechanism for materials and fuels is provided; the feeding mechanism comprises a feeding component for material feeding and a feeding component for fuel feeding; the furnace body 1 is connected with an air inlet duct for tertiary air to enter; the feeding component comprises a feeding pipe 2 for material feeding arranged on the furnace body 1; the feeding component comprises a coal powder feeding pipe 4 and a biomass fuel feeding pipe 3; the invention discloses a combustion device of a fuel complementary system, which can realize the supply of multiple fuels into the furnace body 1 through the optimization of the feeding mechanism, and can well solve the problem of easy crusting of the inner wall of the furnace body 1 in the industry; at the same time, it can meet the large-scale production of cement clinker, save resources, reduce production costs, and realize the reduction and harmless disposal of biomass fuels such as straw; from the overall point of view, the combustion device disclosed by the invention is actually a multi-fuel complementary device, which can better ensure the full combustion of the fuel in the combustion device through the cooperation of biomass fuel and coal powder, which is conducive to the effective decomposition of raw materials; the combustion device will not be affected by Cl in the biomass fuel - The introduction of harmful components such as Na2O and K2O leads to the occurrence of risks such as crusting; at the same time, the tertiary air of the present invention performs rotary cutting movement in the furnace body 1, thereby better ensuring the mutual mixing of raw materials, biomass fuel and coal powder.

[0027] Preferably, the delivery pipe 2 in the present invention is provided with a material delivery channel, the pulverized coal feeding pipe 4 is provided with a pulverized coal delivery channel; the biomass fuel feeding pipe 3 is provided with a biomass delivery channel; the center lines of the material delivery channel, the pulverized coal delivery channel and the biomass delivery channel are arranged to intersect; such an arrangement allows the material, biomass fuel and pulverized coal to be delivered to a position close to the center of the furnace body 1, which can facilitate the subsequent mixing of tertiary air, material, pulverized coal and biomass fuel, and facilitate the subsequent combustion mixing.

[0028] Preferably, the pulverized coal feed pipeline 4 and the biomass fuel feed pipeline 3 in the present invention are distributed on both sides of the delivery pipeline 2; such an arrangement is to facilitate the subsequent coordination of the tertiary air intake, to ensure the full combustion of the biomass fuel and pulverized coal, and to avoid the alkaline substances in the biomass fuel causing the inner wall of the furnace body 1 to form a crust and other problems.

[0029] Preferably, the biomass fuel feed pipe 3 described in the present invention is arranged close to the delivery pipe 2; such an arrangement allows the material to quickly contact the biomass fuel after being cooled by the tertiary air, thereby achieving preliminary decomposition of the material; in addition, as a greater optimization, the angle range between the horizontal projection of the biomass fuel feed pipe 3 described in the present invention and the delivery pipe 2 is 10°-30°; adopting such an arrangement within the range of distinction can make the biomass fuel contact with the material faster, while preventing the deflagration of the biomass fuel and ensuring the preliminary decomposition of the material by the biomass fuel; in actual use, the angle range can be selected to be 25°.

[0030] Preferably, the angle between the horizontal projection of the coal powder feeding pipe 4 and the delivery pipe 2 in the present invention is in the range of 30°-60°; such a setting enables the biomass fuel to achieve initial combustion and decomposition after mixing with the material, and then contact and mix with the coal powder, so that the fuel can present a continuous supply; the purpose is to enable the biomass fuel and coal powder to continuously and effectively decompose the material; in actual use, the angle is conventionally selected to be 45°, but other angles can also be selected.

[0031] Preferably, the air inlet duct in the present invention is located below the feeding mechanism; such a setting can achieve that the tertiary air is mixed with the material first, and after the material is mixed with the tertiary air, the temperature of the tertiary air can be reduced, thereby avoiding that the tertiary air with high temperature and high O2 concentration is directly mixed with the high-volatile biomass fuel, avoiding the occurrence of deflagration.

[0032] Preferably, the air inlet duct in the present invention is arranged at an angle, and such an arrangement can make the tertiary air perform a rotary cutting motion along the inside of the furnace body 1, which is convenient for the subsequent mixing of materials and fuel, and better ensures the subsequent combustion and decomposition of materials; in addition, the air inlet duct is preferably arranged close to the material delivery pipe 2; the air inlet duct is opened at one end close to the furnace body 1 and extends toward the biomass fuel feed pipe 3 in the adjacent feeding mechanism; the tertiary air can be mixed with the material first, and after the material is mixed with the tertiary air, the temperature of the tertiary air can be reduced, thereby avoiding the direct mixing of the tertiary air with high temperature and high O2 concentration with the biomass fuel with high volatility, and avoiding the occurrence of deflagration.

[0033] Preferably, the coal powder delivery channel and the biomass fuel delivery channel at the lowest end in the present invention are on the same plane; this can ensure the uniform mixing of the tertiary air with the coal powder and the biomass fuel, ensure the continuous supply of the fuel, and ensure the continuous operation of the combustion tank; in addition, the plane at the lower end of the material delivery channel is higher than the plane at the lower ends of the coal delivery channel and the biomass fuel delivery channel, and this arrangement allows the tertiary air to be mixed evenly with the material, because the lowest end of the material delivery channel is higher than the coal delivery channel and the biomass fuel delivery channel; this allows the material ventilation channel to have a height difference with the coal feed channel and the biomass fuel feed channel, so that the mixed material and the tertiary air can be better mixed with the biomass material; and better ensure the uniformity of the combustion of the material and the fuel.

[0034] Preferably, the combustion device of the present invention is provided with a plurality of feeding mechanisms, and the feeding components are evenly distributed on the furnace body 1, which is convenient for subsequent arrangement and can better ensure the sufficient decomposition of the materials and avoid the occurrence of explosion problems. In actual distribution, the pulverized coal feeding pipeline 4, the material delivery pipeline 2, and the fuel feeding pipeline in each feeding mechanism are distributed in a clockwise direction on the furnace body 1, and the distance between them is adjusted according to actual needs.

[0035] Preferably, a flow regulating valve is provided on the air inlet duct in the present invention; it can be used to adjust the air intake of the air inlet duct; the tertiary air enters the furnace body 1 through the air inlet duct, and the tertiary air entering the furnace body 1 first contacts with the material and then contacts with the biomass fuel; with this arrangement, the tertiary air can be mixed with the material first, and after the material is mixed with the tertiary air, the temperature of the tertiary air can be reduced, thereby avoiding the direct mixing of the tertiary air with high temperature and high O2 concentration with the biomass fuel with high volatility, and avoiding the occurrence of deflagration; in addition, coal powder has a longer burning time, can continuously and effectively decompose the material, and ensure the uniformity of material decomposition.

[0036] Based on the above statements, in order to more clearly express the innovative features of the present invention, a discussion will be given below in conjunction with specific embodiments.

[0037] The combustion device disclosed in the present invention is actually a dual-fuel complementary device, which achieves full decomposition of materials through segmented mixed combustion of biomass fuel and coal powder.

[0038] The specific reason is that biomass alternative fuels have high volatile content, are extremely flammable (explosive), but are not resistant to burning and have low calorific value. At the same time, with the development of global energy and comprehensive utilization of resources, the cement industry has been using traditional low-quality coal, which has the characteristics of high ash content and low volatile content.

[0039] The present invention combines the combustion characteristics of biomass fuel and inferior coal for comprehensive resource application, optimizes the overall structure of the combustion device, realizes the matching use of tertiary air, biomass fuel, coal powder and materials, ensures high-efficiency utilization of fuel and full decomposition of materials.

[0040] Specifically: two feeding mechanisms are provided on the furnace body 1, each feeding mechanism includes a coal powder feeding pipeline 4, a material delivery pipeline 2 and a biomass fuel feeding pipeline 3. From the top view, the two feeding mechanisms are symmetrically arranged; they are marked as coal powder feeding pipeline I4-1, material delivery pipeline I2-1, biomass fuel feeding pipeline I3-1, coal powder feeding pipeline II4-2, material delivery pipeline II2-2 and biomass fuel feeding pipeline II3-2; each pipeline is distributed in a ring in the furnace body 1 in sequence; the inlet of the air inlet duct is below the material delivery pipeline 2; as shown in the attached figure.

[0041] In specific operation, first, the air inlet duct is connected with a high-temperature tertiary air input device, and the tertiary air is whirled and mixed with the material input from the material input pipe II2-2, and then mixed with the biomass fuel input from the biomass fuel input pipe II3-2. The main purpose of this design is to prevent the tertiary air with high temperature and high O2 concentration from directly mixing with the biomass fuel with high volatility to produce deflagration; because the addition of low-temperature raw materials can reduce the temperature of the incoming tertiary air, thereby effectively avoiding the occurrence of the above problems;

[0042] The biomass fuel feeding point is designed to be close to the raw meal feeding point, and the design angle is controlled within 25°; this can better ensure the initial combustion of the raw meal and avoid the mixing of the raw meal and biomass fuel being affected by the long distance; it can also avoid the mixing of the raw meal and biomass fuel being affected by the short distance.

[0043] After continuous operation, the tertiary wind continues to rotate to the lower end of the feed channel in the coal powder feed pipe I4-1. At this time, the temperature of the tertiary wind mixed with the material delivery pipe II2-2 and the biomass fuel feed pipe II3-2 is moderate, and it continues to mix and burn with the coal powder delivered from the coal powder feed pipe I4-1, so that the coal powder has a longer combustion time, so that it can continuously and effectively decompose the materials delivered to the furnace body 1 from the material delivery pipe I2-1 and the material delivery pipe II2-2; after continuous movement, the tertiary wind rotates to the biomass fuel feed pipe I3-1. At this time, since the tertiary wind has been burned and decomposed with the coal, biomass fuel and raw materials in the previous section, and then enters the biomass fuel feed pipe I3-1, the O2 concentration of the cross section has dropped significantly, and there will be basically no explosion and crusting phenomenon. Finally, the tertiary wind moves to the coal powder feed pipe II4-2, and continues to mix for combustion and decomposition reactions. At this point, the entire fluid cross-section movement process ends.

[0044] Based on the above disclosure, the combustion device disclosed in the present invention can be developed. The fuel is put into the combustion device in different areas, which can avoid the occurrence of local explosion problems. In addition, by planning the rotary cutting direction of the tertiary wind, the full utilization of the fuel can be better guaranteed, and the full decomposition of the material can be guaranteed.

[0045] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A combustion device of a fuel complementary system, characterized in that: It comprises a furnace body, on which a feeding mechanism for materials and fuel is provided; the feeding mechanism comprises a feeding component for material feeding and a feeding component for fuel feeding; the furnace body is connected with an air inlet duct for tertiary air to enter; the feeding component comprises a feeding duct arranged on the furnace body for material feeding; the feeding component comprises a coal powder feeding duct and a biomass fuel feeding duct; The delivery pipeline is provided with a material delivery channel, the pulverized coal feed pipeline is provided with a pulverized coal delivery channel; the biomass fuel feed pipeline is provided with a biomass delivery channel; the center lines of the material delivery channel, the pulverized coal delivery channel and the biomass delivery channel are arranged to intersect; The air inlet duct is located below the feeding mechanism; The air inlet duct is arranged obliquely, and the air inlet duct is arranged close to the material delivery duct; the air inlet duct is opened at one end close to the furnace body and extends toward the biomass fuel feed duct in the adjacent feed mechanism; The lower ends of the coal powder delivery channel and the biomass fuel delivery channel are on the same plane; the plane at the lower end of the material delivery channel is higher than the plane at the lower ends of the coal delivery channel and the biomass fuel delivery channel; The tertiary air enters the furnace body through the air inlet duct, and the tertiary air entering the furnace body first contacts the material and then contacts the biomass fuel.

2. The combustion device of the fuel complementary system according to claim 1, characterized in that: The pulverized coal feed pipeline and the biomass fuel feed pipeline are distributed on both sides of the delivery pipeline.

3. The combustion device of the fuel complementary system according to claim 2, characterized in that: The biomass fuel feed pipeline is arranged close to the delivery pipeline; the angle between the horizontal projection of the biomass fuel feed pipeline and the delivery pipeline is in the range of 10°-30°.

4. The combustion device of the fuel complementary system according to claim 3, characterized in that: The angle between the horizontal projections of the pulverized coal feeding pipeline and the delivery pipeline is in the range of 30°-60°.

5. The combustion device of the fuel complementary system according to claim 1, characterized in that: The combustion device is provided with a plurality of feeding mechanisms, and each feeding component is evenly distributed on the furnace body.

6. The combustion device of the fuel complementary system according to claim 1, characterized in that: A flow regulating valve is arranged on the air inlet duct.

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