Feeding device for alternative fuels in a decomposition furnace

Abstract

The utility model relates to cement clinker production line technical field discloses a kind of feeding device of decomposing furnace substitute fuel, including decomposing furnace, decomposing furnace includes upper feeding port and lower feeding port sequentially arranged, tertiary air pipe is arranged in the side of decomposing furnace, tertiary air pipe includes first air pipe branch and second air pipe branch, first air pipe branch and second air pipe branch are communicated with upper feeding port and lower feeding port respectively, intermediate bin, the top of intermediate bin is set to be open, the inside of intermediate bin is provided with electric gate, to separate intermediate bin into first bin and second bin, the bottom end of first bin is communicated with upper feeding port, the bottom end of second bin is communicated with lower feeding port, conveying device, it is set to the side upper of intermediate bin, for with intermediate bin cooperation separates light fuel and heavy fuel in substitute fuel and respectively transports to first bin and second bin;The feeding device of decomposing furnace substitute fuel can improve the combustion effect in decomposing furnace, reduce carbon dioxide emission.

Description

Technical Field

[0001] This utility model relates to the technical field of cement clinker production lines, and more specifically to a feeding device for alternative fuel in a decomposition furnace. Background Technology

[0002] Currently, cement clinker production consumes a large amount of fossil fuels and emits significant amounts of carbon dioxide. To address the pressure of energy conservation and carbon reduction, using solid waste such as biomass pellets, RDF (recycled fuel), and waste textiles as alternative fuels to reduce energy consumption and carbon emissions in clinker production lines is a practical and effective solution.

[0003] Because each batch of alternative fuels contains both heavy, difficult-to-burn alternative fuels and light, easily flammable alternative fuels, these two different types of alternative fuels have different combustion characteristics. If they are used in the same feed channel to the decomposition furnace, the combustion effect of the alternative fuels cannot be fully utilized, thus reducing the efficiency and effectiveness of clinker calcination. In addition, due to the unstable source of alternative fuels, the combustion effect in the decomposition furnace is currently poor, with CO levels reaching as high as 10,000 ppm, which is not yet sufficient for large-scale substitution.

[0004] Utility model patent CN221593454U discloses a multi-point feeding device for alternative fuel cement kilns. This feeding device uses an electric flap valve to divert material, thus achieving dual-point feeding. However, in this technical solution, because the electric flap valve is a valve that uses an electric actuator to drive a valve plate to rotate, allowing for media flow or cut-off, the feed inlet of this device, in conjunction with the electric flap valve, can only handle one type of alternative fuel at a time. It cannot separate different types of alternative fuels entering the feed inlet, therefore it cannot achieve simultaneous dual-point feeding, resulting in low efficiency. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the problems existing in the prior art, and to provide a feeding device for alternative fuels in a decomposition furnace. This feeding device can pre-screen light and heavy alternative fuels to improve the combustion effect in the decomposition furnace.

[0006] To achieve the above objectives, this utility model provides a feeding device for alternative fuels in a decomposition furnace, comprising:

[0007] A decomposition furnace, comprising an upper feed port and a lower feed port arranged sequentially from top to bottom;

[0008] A tertiary air duct is provided on the side of the decomposition furnace. The tertiary air duct includes a first air duct branch and a second air duct branch. The first air duct branch and the second air duct branch are respectively connected to the upper feed port and the lower feed port.

[0009] The intermediate compartment has an open top and an electric gate inside to divide it into a first compartment and a second compartment. The bottom of the first compartment is connected to the upper feeding port, and the bottom of the second compartment is connected to the lower feeding port.

[0010] A conveying device is disposed above one side of the intermediate compartment and is used to cooperate with the intermediate compartment to separate the light fuel and heavy fuel in the alternative fuel and transport them to the first compartment and the second compartment respectively.

[0011] Optionally, one end of the electric gate is provided with a drive source, which is used to drive the electric gate to rotate within the intermediate compartment.

[0012] Optionally, the conveying device includes an adjustable speed belt that is inclined upward toward the intermediate bin.

[0013] Optionally, the adjustable speed belt is located on the side of the intermediate compartment near the second compartment.

[0014] Optionally, the lower ends of the first compartment and the second compartment are both configured as tapered structures with an inner diameter that gradually decreases from top to bottom.

[0015] Optionally, the feeding device for the alternative fuel in the decomposition furnace further includes a conveyor belt, which is located below the bottom of the second chamber, and the output end of the conveyor belt is connected to the lower feeding port.

[0016] Optionally, a spiral cutter is connected to the bottom end of the second compartment, the spiral cutter being used to transport the alternative fuel inside the second compartment onto the conveyor belt.

[0017] Optionally, the feeding device for the alternative fuel in the decomposition furnace further includes a first chute and a second chute, wherein the first chute is disposed between the bottom end of the first chamber and the upper feeding port, and the second chute is disposed between the output end of the conveyor belt and the lower feeding port.

[0018] Optionally, a first pneumatic baffle and a first electric flap valve are arranged sequentially from top to bottom near the upper feed port of the first chute, and a second pneumatic baffle and a second electric flap valve are arranged sequentially from top to bottom near the lower feed port of the second chute.

[0019] Optionally, both the upper feeding port and the lower feeding port are provided to extend obliquely upwards.

[0020] Through the above technical solution, before the alternative fuel is fed into the furnace, the light and heavy alternative fuels are pre-screened by the conveying device and the intermediate bin. The decomposition furnace is equipped with an upper feeding port connected to the first air duct branch and a lower feeding port connected to the second air duct branch. The two-point feeding is adopted. The tertiary air introduction duct is arranged vertically. The alternative fuel is sent into the decomposition furnace by the tertiary air. For alternative fuels with different combustion characteristics, the feeding point is adjusted according to the kiln conditions (single-point feeding or two-point simultaneous feeding) to ensure stable system operation and improve the combustion efficiency and effect in the decomposition furnace. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the planar structure of a feeding device for a decomposition furnace alternative fuel provided by this utility model;

[0022] Figure 2 This is a schematic diagram showing the distribution of the upper and lower feeding ports in this utility model.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Decomposition furnace; 11. Upper feed inlet; 12. Lower feed inlet; 2. Tertiary air duct; 21. First air duct branch; 22. Second air duct branch; 3. Intermediate silo; 31. First silo; 32. Second silo; 33. Electric gate valve; 4. Conveying device; 5. Conveyor belt; 6. Spiral auger; 7. First chute; 71. First pneumatic baffle; 72. First electric flap valve; 8. Second chute; 81. Second pneumatic baffle; 82. Second electric flap valve. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0026] Lightweight, easily combustible alternative fuels (such as rice husks, crushed straw, leaves, waste cloth, etc.) are prone to deflagration near the feeding point after being fed into decomposition furnace 1 due to their low density, poor dispersibility, and high volatile content. This also consumes oxygen in the furnace and affects the combustion of pulverized coal in decomposition furnace 1. On the other hand, heavy, difficult-to-burn alternative fuels (such as household waste, branches, wood, etc.) have a slower rate of moisture evaporation, heat transfer, and mass transfer after being fed into decomposition furnace 1, resulting in a longer burnout time and an unsatisfactory burnout rate within a limited volume.

[0027] Based on this, combined Figure 1 and Figure 2 As shown, this utility model provides a feeding device for alternative fuel in a decomposition furnace 1, including a decomposition furnace 1, a tertiary air duct 2, an intermediate silo 3, and a conveying device 4.

[0028] Specifically, the decomposition furnace 1 includes an upper feed port 11 and a lower feed port 12 arranged sequentially from top to bottom. The tertiary air duct 2 is located on the side of the decomposition furnace 1. The tertiary air duct 2 includes a first air duct branch 21 and a second air duct branch 22. The first air duct branch 21 and the second air duct branch 22 are respectively connected to the upper feed port 11 and the lower feed port 12. The top of the intermediate chamber 3 is open. An electric gate 33 is installed inside the intermediate chamber 3 to divide the intermediate chamber 3 into a first chamber 31 and a second chamber 32. The bottom end of the first chamber 31 is connected to the upper feed port 11, and the bottom end of the second chamber 32 is connected to the lower feed port 12. The conveying device 4 is located above one side of the intermediate chamber 3 and is used to cooperate with the intermediate chamber 3 to separate the light fuel and heavy fuel in the alternative fuel and transport them to the first chamber 31 and the second chamber 32 respectively.

[0029] Through the above technical solution, the alternative fuel is conveyed into the intermediate chamber 3 by the conveying device 4. Due to the different physical properties of light and heavy fuels, their entry points into the intermediate chamber 3 are also different, thus naturally achieving screening and separation within the intermediate chamber 3. Light fuel enters the first chamber 31, and heavy fuel enters the second chamber 32. Next, the light fuel in the first chamber 31 enters the decomposition furnace 1 through the upper feed port 11, and the heavy fuel in the second chamber 32 enters the decomposition furnace 1 through the lower feed port 12. Simultaneously, the upper feed port 11 and the lower feed port 12 respectively introduce tertiary air through the first air duct branch 21 and the second air duct branch 22 to provide hot air and oxygen. The tertiary air carries the alternative fuel into the decomposition furnace 1, ensuring uniform dispersion of the alternative fuel while providing sufficient oxygen and heat source to guarantee complete combustion of the alternative fuel and reduce the impact of incomplete combustion of the alternative fuel on the kiln operation.

[0030] Understandably, this invention pre-treats the alternative fuels before they enter the furnace, using the conveying device 4 and the intermediate chamber 3 to pre-screen the light and heavy alternative fuels, ensuring the stability of the alternative fuel characteristics. This invention employs a two-point feeding method, using tertiary air to deliver the alternative fuels into the decomposition furnace 1. For alternative fuels with different combustion characteristics, the feeding point can be adjusted according to the kiln conditions (e.g., single-point feeding or simultaneous two-point feeding), ensuring stable system operation.

[0031] In some embodiments, the position of the second duct branch 22 remains unchanged, and a first duct branch 21 is provided on it to lead a tertiary air to the upper feed port 11 of the decomposition furnace 1, adopting a "single air inlet tangential form".

[0032] In this invention, a drive source is provided at one end of the electric gate 33, which drives the electric gate 33 to rotate within the intermediate compartment 3. By controlling the rotational speed and direction of the drive source, the angle of the electric gate 33 can be adjusted to achieve the flow distribution of alternative fuel between the first compartment 31 and the second compartment 32, meeting the needs of different operating conditions.

[0033] In this invention, the conveying device 4 includes an adjustable speed belt, which is inclined upwards towards the intermediate bin 3. The adjustable speed belt is located on the side of the intermediate bin 3 near the second bin 32. For different batches of alternative fuels, the adjustable speed function allows the belt to flexibly adjust its running speed according to the physical characteristics of different alternative fuels. Combined with the angle adjustment of the electric gate 33, this ensures that the alternative material can accurately fall into the intermediate bin 3 and be screened. Preferably, the adjustable speed belt is inclined upwards towards the intermediate bin 3. By utilizing the synergistic effect of gravity and belt movement, light and heavy fuels of different densities and particle sizes in the alternative fuel naturally separate into layers during the conveying process, which can further improve the screening effect.

[0034] In this invention, in order to improve the efficiency of alternative fuel discharge in the intermediate compartment 3, the lower ends of the first compartment 31 and the second compartment 32 are both designed as conical structures with an inner diameter that gradually decreases from top to bottom.

[0035] In this invention, the feeding device for the alternative fuel in the decomposition furnace 1 further includes a conveyor belt 5, which is located below the bottom of the second chamber 32, and the output end of the conveyor belt 5 is connected to the lower feeding port 12. Furthermore, a spiral cutter 6 is connected to the bottom of the second chamber 32, which is used to transport the alternative fuel inside the second chamber 32 onto the conveyor belt 5.

[0036] The conveyor belt 5 is used to continuously and stably transport heavy alternative fuel from the bottom of the second compartment 32 to the lower feed port 12 of the decomposition furnace 1, ensuring the continuity of fuel supply. The fuel delivery volume can be dynamically adjusted by regulating the belt speed to match the combustion requirements of the decomposition furnace 1. At the same time, the conveyor belt 5 can act as a buffer when the fuel moisture content fluctuates or the furnace operating conditions change, avoiding combustion instability caused by sudden changes in instantaneous flow.

[0037] Furthermore, since the heavy fuel in the second compartment 32 has a high density and large particle size, it is easy to cause blockage at the discharge port. The spiral auger 6, through the forced propulsion of the rotating blades, delivers the fuel evenly and continuously to the conveyor belt 5, which can avoid material interruption and blockage. It is understood that in some embodiments, the spiral auger 6 is set to have adjustable speed and blade spacing, which can adapt to fuels with different moisture content and particle size distribution, and ensure conveying stability.

[0038] In this utility model, the feeding device for the alternative fuel of the decomposition furnace 1 also includes a first chute 7 and a second chute 8. The first chute 7 is located between the bottom end of the first chamber 31 and the upper feeding port 11, and the second chute 8 is located between the output end of the conveyor belt 5 and the lower feeding port 12.

[0039] Understandably, the first chute 7 connects the bottom of the first chamber 31 to the upper feed port 11 of the decomposition furnace 1, forming a dedicated conveying channel for light fuel. The smooth inner wall of the first chute 7 reduces fuel flow resistance and avoids blockage or material accumulation caused by poor conveying, ensuring that light fuel enters the decomposition furnace 1 stably and continuously.

[0040] The second chute 8 connects the output end of the conveyor belt 5 to the lower feed port 12 of the decomposition furnace 1, serving as a conveying channel for heavy fuel. The structure of the second chute 8 can buffer the impact force generated by the falling fuel at the end of the conveyor belt 5, reducing dust emissions.

[0041] Light fuel enters the upper part of the decomposition furnace 1 through the first chute 7, while heavy fuel enters the lower part of the decomposition furnace 1 through the second chute 8. This stratified feeding method creates a reasonable temperature gradient in the furnace, allowing light fuel to burn rapidly in the upper layer and heavy fuel to burn slowly in the lower layer, thus improving combustion efficiency and reducing the emission of unburned carbon.

[0042] Furthermore, the first chute 7 and the second chute 8 serve as independent conveying channels, which can isolate the impact of malfunctions in the light fuel conveying channel or the heavy fuel conveying channel on the decomposition furnace 1. For example, if the first chute 7 becomes blocked, it can be cleaned separately without affecting the conveying of heavy fuel.

[0043] The independent design of the first chute 7 and the second chute 8 enables the system to process alternative fuels with different characteristics simultaneously, making it highly adaptable and especially suitable for mixed fuels with large differences in moisture content and particle size.

[0044] In some embodiments, the slope and cross-sectional area of ​​the chute can be adjusted according to the fuel characteristics to achieve flexible control of the flow rate of light and heavy fuels, and meet the requirements of the decomposition furnace 1 for different fuel ratios.

[0045] In this utility model, a first pneumatic baffle 71 and a first electric flap valve 72 are arranged sequentially from top to bottom near the upper feed port 11 of the first chute 7, and a second pneumatic baffle 81 and a second electric flap valve 82 are arranged sequentially from top to bottom near the lower feed port 12 of the second chute 8.

[0046] The first pneumatic baffle 71 and the second pneumatic baffle 81 can be closed when not in use to prevent air leakage in the system. The first electric flap valve 72 and the second electric flap valve 82 are designed to prevent air leakage in the system during feeding, thereby improving the stability and reliability of the entire system.

[0047] In this invention, both the upper feeding port 11 and the lower feeding port 12 extend obliquely upwards. This oblique upward extension design allows the fuel to flow naturally under gravity, reducing the impact and accumulation caused by vertical falling.

[0048] In summary, by using the above technical solutions, the adaptability of alternative fuel combustion and heat release rates to existing thermal systems is improved, incomplete combustion of the system is avoided, fossil fuel consumption is reduced, and carbon emissions are decreased.

[0049] ① The system's CO content can be reduced from 10,000 ppm to less than 5,000 ppm, which can reduce CO2 emissions by 7.7 kg / t.cl.

[0050] ② The alternative fuel feed rate can be increased by about 3.0 t / h, which can reduce standard coal consumption by about 6.5 kg / t.cl and reduce CO2 emissions by 18.1 kg / t.cl.

[0051] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A feed device for a decomposition furnace alternative fuel, characterized by, include: Decomposition furnace (1), the decomposition furnace (1) includes an upper feeding port (11) and a lower feeding port (12) arranged sequentially from top to bottom; A tertiary air duct (2) is provided on the side of the decomposition furnace (1). The tertiary air duct (2) includes a first air duct branch (21) and a second air duct branch (22). The first air duct branch (21) and the second air duct branch (22) are respectively connected to the upper feed port (11) and the lower feed port (12). The intermediate compartment (3) has an open top and an electric gate (33) inside to divide the intermediate compartment (3) into a first compartment (31) and a second compartment (32). The bottom end of the first compartment (31) is connected to the upper feed port (11), and the bottom end of the second compartment (32) is connected to the lower feed port (12). A conveying device (4) is disposed above one side of the intermediate compartment (3) and is used to cooperate with the intermediate compartment (3) to separate the light fuel and heavy fuel in the alternative fuel and transport them to the first compartment (31) and the second compartment (32) respectively.

2. The feeding device for the alternative fuel in the decomposition furnace according to claim 1, characterized in that, One end of the electric gate (33) is provided with a drive source, which is used to drive the electric gate (33) to rotate in the intermediate compartment (3).

3. The feeding device for the alternative fuel in the decomposition furnace according to claim 2, characterized in that, The conveying device (4) includes an adjustable speed belt that is inclined upward toward the intermediate bin (3).

4. The feeding device for the alternative fuel in the decomposition furnace according to claim 3, characterized in that, The adjustable speed belt is located on the side of the intermediate compartment (3) near the second compartment (32).

5. The feeding device for the alternative fuel in the decomposition furnace according to claim 1, characterized in that, The lower ends of the first compartment (31) and the second compartment (32) are both designed as conical structures with an inner diameter that gradually decreases from top to bottom.

6. The feeding device for the alternative fuel of the decomposition furnace according to claim 5, characterized in that, The feeding device for the alternative fuel of the decomposition furnace (1) also includes a conveyor belt (5), which is located below the bottom of the second chamber (32), and the output end of the conveyor belt (5) is connected to the lower feeding port (12).

7. The feeding device for the alternative fuel in the decomposition furnace according to claim 6, characterized in that, The bottom end of the second compartment (32) is connected to a spiral reamer (6), which is used to transport the alternative fuel inside the second compartment (32) to the conveyor belt (5).

8. The feeding device for the alternative fuel of the decomposition furnace according to claim 6, characterized in that, The feeding device for the alternative fuel of the decomposition furnace (1) also includes a first chute (7) and a second chute (8). The first chute (7) is located between the bottom end of the first bin (31) and the upper feeding port (11), and the second chute (8) is located between the output end of the conveyor belt (5) and the lower feeding port (12).

9. The feeding device for the alternative fuel of the decomposition furnace according to claim 8, characterized in that, The first chute (7) is provided with a first pneumatic baffle (71) and a first electric flap valve (72) from top to bottom near the upper feed port (11), and the second chute (8) is provided with a second pneumatic baffle (81) and a second electric flap valve (82) from top to bottom near the lower feed port (12).

10. The feeding device for the alternative fuel of the decomposition furnace according to claim 1, characterized in that, Both the upper feeding port (11) and the lower feeding port (12) are arranged to extend obliquely upwards.

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