Air draft forced cooling combustion control system of roasting furnace

Abstract

The invention relates to the technical field of roasting furnaces, in particular to an air draft forced cooling combustion control system for a roasting furnace, which comprises 18 furnace chambers which are connected in series and sequentially comprise 1 # to 18 # furnace chambers, 3 # to 5 # furnace chambers are preheating areas, 6 # to 8 # furnace chambers are heating areas, 9 # to 16 # furnace chambers are cooling areas, an air blowing frame and an air draft frame, the air blowing frame is arranged between a 12 # furnace chamber and a 13 # furnace chamber, and the air draft frame is arranged between the 12 # furnace chamber and the 13 # furnace chamber. And the air draft frame is arranged between the 14 # furnace chamber and the 15 # furnace chamber. The air draft frame is arranged between the 14 # furnace chamber and the 15 # furnace chamber, so that an air blowing-air draft cooling mode is formed, the positive pressure in the flame path is remarkably reduced, air in the flame path is conveyed to the outside of a workshop, and the production problem that the environment temperature of the workshop is high is solved.

Description

Technical Field

[0001] This invention relates to the field of roasting furnace technology, and in particular to a roasting furnace exhaust cooling and combustion control system. Background Technology

[0002] The open-type annular roasting furnace is a core production equipment for high-temperature modification of green anodes in carbon enterprises. The roasting process of the anodes is achieved by relying on the furnace's combustion control system according to a set temperature rise curve. After the anode products inside the furnace are heated to a certain temperature through preheating and heating stages, their various physicochemical properties meet the requirements for use in electrolytic aluminum production. Before being discharged from the furnace, the high-temperature anodes inside the furnace undergo a cooling stage to reduce their temperature to the discharge temperature. Based on the control stages of the anode temperature change by the combustion control system, the roasting cycle can be divided into a preheating stage, a heating stage, and a cooling stage.

[0003] Currently, in the production process of roasting enterprises, the typical combustion control system in the 18-chamber operation mode is a forced-air-forced-cooling mode. The exhaust rack provides negative pressure to the fire duct, extracting the exhaust gas after combustion from the fire duct and sending it to the purification system. Since the exhaust gas temperature can preheat the 3#-5# furnace chambers, the 3#-5# furnace chambers are the preheating zone. The combustion rack injects combustible gas into the fire duct according to the target temperature requirements to indirectly heat the anode products inside the feed box, corresponding to the 6#-8# furnace chambers as the heating zone. The two forced-air racks blow ambient air into the fire duct to cool the fire duct, corresponding to the 9#-16# furnace chambers as the cooling zone.

[0004] In current production, the forced-air cooling mode presents two main challenges: Firstly, vertical slits are installed in the wall between the fire channel and the material box. In the preheating zone, these slits allow volatiles to overflow and enter the fire channel for combustion. In the cooling zone, the forced-air cooling mode results in excessively high positive pressure inside the fire channel of the furnace chamber. Air then enters the material box through these slits and reacts with the anode, leading to severe anode oxidation during production. Secondly, during the cooling process, all the fire channel holes and transverse wall holes above furnace chambers 13-16 in the cooling zone are opened. The heated air blown into the fire channel flows into the workshop through these open holes, causing excessively high temperatures inside the roasting workshop, affecting the normal operation of the equipment and the workers' working environment. Summary of the Invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a roasting furnace exhaust cooling combustion control system. By setting an exhaust frame between furnace chamber 14 and furnace chamber 15, a forced-air cooling mode is formed, which significantly reduces the positive pressure in the fire channel and transports the air inside the fire channel to the outside of the workshop, thus solving the production problem of high ambient temperature in the workshop.

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include: A roasting furnace exhaust and forced cooling combustion control system includes 18 furnace chambers arranged in series, numbered 1#-18#, wherein furnace chambers 3#-5# are preheating zones, furnace chambers 6#-8# are heating zones, and furnace chambers 9#-16# are cooling zones. The system also includes a blower frame and an exhaust frame, wherein the blower frame is located between furnace chambers 12# and 13#, and the exhaust frame is located between furnace chambers 14# and 15#.

[0007] By installing an exhaust fan between furnace chambers #14 and #15, a forced-air cooling mode was created, replacing the traditional forced-air cooling mode. The addition of the exhaust fan significantly reduces the positive pressure inside the flue, preventing cooling air from entering the material box through the vertical seams of the flue and causing anodizing. Furthermore, the air extracted from the flue by the exhaust fan can be transported to the outside of the workshop through process pipelines, fundamentally solving the production problem of high ambient temperature in the workshop, ensuring the normal operation of production equipment, and providing a more suitable operating environment for workers.

[0008] Furthermore, partition walls are provided between adjacent furnace chambers. Each furnace chamber has three baffle walls along the length of the roasting furnace. The baffle walls at both ends are connected to the furnace top, and the furnace bottom has fire passage holes. The middle baffle wall and partition wall are connected to the furnace bottom, and the furnace top has fire passage holes. The baffle walls and partition walls together make the fire channel form an S-shape.

[0009] By setting up partition walls and baffle walls, the gas flow trajectory in the fire channel is limited, making the material in the roasting furnace more evenly heated.

[0010] Furthermore, the furnace top is provided with a transverse wall hole that communicates with the fire passage hole of the partition wall, the blower is connected to the transverse wall hole between furnace chamber #12 and furnace chamber #13, and the exhaust fan is connected to the transverse wall hole between furnace chamber #14 and furnace chamber #15.

[0011] Furthermore, each fire channel has a fire channel hole at the top of the furnace corresponding to the vertical part of the fire channel, and the two fire channel holes in furnace chamber #12 adjacent to the blower frame are in the closed state.

[0012] In the traditional forced draft-forced draft cooling mode, the two flue holes adjacent to the blower frame in furnace chamber #12 may be opened to maintain pressure balance within the corresponding flues of furnace chambers #3-#12 through airflow self-balancing. However, in the forced draft-exhaust cooling mode, the two flue holes adjacent to the blower frame in furnace chamber #12 are always closed. This is because the exhaust frame exerts a significant suction force on the air blown into the flues by the blower frame. Whether these two flue holes are open or closed has a significant impact. Opening them would result in insufficient kinetic energy of the forced draft towards furnace chamber #1, reducing the airflow volume. The end result is insufficient flue gas in the combustion chamber, incomplete combustion, and increased production energy consumption. To ensure sufficient airflow, the pressure of the blower frame must be significantly increased, which in turn significantly increases the energy consumption of the blower, thus also significantly increasing production energy consumption.

[0013] Furthermore, the two fire duct holes adjacent to the exhaust frame are in a closed state.

[0014] In the traditional forced-air cooling mode, all the fire holes and transverse wall holes above furnace chambers #13-#17 are open, so that all the forced-in air can dissipate through the fire channels, carrying heat away from the fire channels. The forced-air cooling mode of this invention closes the two fire channel holes adjacent to the exhaust frame, achieving a more effective exhaust effect on a more distant location. This ensures that sufficient air can flow into the fire channels far from the exhaust frame, preventing excessive cooling air from entering through adjacent fire channel holes, which would ultimately affect the cooling effect.

[0015] Furthermore, it also includes a flue gas rack and a combustion rack, wherein the flue gas rack is located between furnace chamber #2 and furnace chamber #3, and the combustion rack is located at the top of furnace chambers #6-#8.

[0016] The beneficial effects of this invention are: This invention discloses a forced-draft cooling combustion control system for a roasting furnace. By installing an exhaust fan between furnace chambers #14 and #15, a forced-draft cooling mode is formed, replacing the traditional forced-draft cooling mode. The addition of the exhaust fan significantly reduces the positive pressure within the combustion chamber, preventing cooling air from entering the material box through the vertical gaps in the combustion chamber and causing anodizing. Furthermore, after the exhaust fan extracts air from the combustion chamber, it can be transported to the outside of the workshop through process pipelines, fundamentally solving the production problem of high ambient temperature in the workshop, ensuring the normal operation of production equipment, and providing a more suitable operating environment for workers. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a forced cooling combustion control system for a roasting furnace according to the present invention; Figure 2 This is a schematic diagram of the structure of furnace chambers 12#-15# of the present invention.

[0018] In the diagram: 1. Furnace chamber; 2. Furnace bottom; 3. Furnace top; 4. Fire channel; 5. Partition wall; 6. Baffle wall; 7. Fire passage hole; 8. Fire channel hole; 9. Horizontal wall hole; 10. Blower frame; 11. Exhaust frame; 12. Smoke exhaust frame; 13. Combustion frame. Detailed Implementation

[0019] To better explain and facilitate understanding of the present invention, it will be described in detail below with reference to the accompanying drawings and specific embodiments. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a clearer and more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0020] like Figure 1-Figure 2 As shown, a roasting furnace exhaust and forced cooling combustion control system includes 18 furnace chambers 1 arranged in series, numbered 1#-18#. Among them, furnace chambers 3#-5# are preheating zones, furnace chambers 6#-8# are heating zones, and furnace chambers 9#-16# are cooling zones. The system also includes a blower frame 10 and an exhaust frame 11. The blower frame 10 is located between furnace chambers 12# and 13#, and the exhaust frame 11 is located between furnace chambers 14# and 15#.

[0021] By installing an exhaust fan 11 between furnace chambers 14 and 15, a forced-air cooling mode is formed, replacing the traditional forced-air cooling mode. The addition of the exhaust fan 11 significantly reduces the positive pressure inside the fire channel 4, preventing cooling air from entering the material box through the vertical seams of the fire channel 4 and causing anodizing. In addition, after the exhaust fan 11 extracts the air from inside the fire channel 4, it can be transported to the outside of the workshop through process pipelines, fundamentally solving the production problem of high ambient temperature in the workshop, ensuring the normal operation of production equipment, and providing a more suitable operating environment for workers.

[0022] Specifically, a partition wall 5 is provided between adjacent furnace chambers 1. Each furnace chamber 1 has 3 baffle walls 6 along the length of the roasting furnace. The baffle walls 6 at both ends are connected to the furnace top 3. The furnace bottom 2 has fire passage holes 7. The middle baffle wall 6 and partition wall 5 are connected to the furnace bottom 2. The furnace top 3 has fire passage holes 7. The baffle wall 6 and partition wall 5 together make the fire channel 4 form an S-shape.

[0023] By setting up partition walls 5 and baffle walls 6, the gas flow trajectory in the fire channel 4 is limited, making the material in the roasting furnace more evenly heated.

[0024] Specifically, the furnace top 3 is provided with a transverse wall hole 9 that is connected to the fire hole 7 of the partition wall 5, the blower frame 10 is connected to the transverse wall hole 9 between furnace chamber 12 and furnace chamber 13, and the exhaust frame 11 is connected to the transverse wall hole 9 between furnace chamber 14 and furnace chamber 15.

[0025] Specifically, each fire channel 4 has a fire channel hole 8 at the furnace top 3 corresponding to the vertical part of the fire channel 4, and the two fire channel holes 8 in furnace chamber 1 No. 12 adjacent to the blower frame 10 are in the closed state.

[0026] In the traditional forced draft-forced draft cooling mode, the two fire channel holes 8 adjacent to the blower frame 10 in furnace chamber 12 may be opened to ensure pressure balance inside the corresponding fire channels 4 of furnace chambers 3-12 through the self-balancing effect of airflow. However, in the forced draft-exhaust cooling mode, the two fire channel holes 8 adjacent to the blower frame 10 in furnace chamber 12 are always closed. This is because the exhaust frame 11 exerts a significant suction force on the air blown into the fire channels 4 by the blower frame 10. Whether the two fire channel holes 8 are open or not has a significant impact. Opening them will result in insufficient kinetic energy of the forced draft towards furnace chamber 1, reducing the air volume. The end result is insufficient flue gas in the combustion frame 13, incomplete combustion, and increased production energy consumption. To ensure sufficient air volume, the pressure of the blower frame 10 must be significantly increased, which will correspondingly increase the fan energy consumption, and thus significantly increase production energy consumption.

[0027] Specifically, the two fire channel holes 8 adjacent to the exhaust frame 11 are in the closed state.

[0028] In the traditional forced-air cooling mode, all the fire holes and transverse wall holes 9 above furnace chambers 1 (13#-17#) are open so that all the forced-air air can dissipate through the fire channel 4, carrying the heat away from the fire channel 4. The forced-air cooling mode of this invention closes the two fire channel holes 8 adjacent to the exhaust frame 11 to achieve a more effective exhaust effect at a greater distance. This ensures that sufficient air can enter the fire channel 4 furthest from the exhaust frame 11, preventing excessive cooling air from entering through the adjacent fire channel holes 8, which would ultimately affect the cooling effect.

[0029] More specifically, the two fire passage holes 8 adjacent to the exhaust frame 11 are the fire passage holes 8 closest to the exhaust frame 11 in furnace chamber 14 and furnace chamber 15, respectively.

[0030] Specifically, it also includes a flue 12 and a combustion rack 13. The flue 12 is located between furnace chamber 2 and furnace chamber 3, and the combustion rack 13 is located at the top of furnace chambers 6-8.

[0031] More specifically, there are three combustion racks 13, which are respectively located on the top of furnace chambers 1 of #6-#8.

[0032] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A forced-cooling combustion control system for a roasting furnace, comprising 18 furnace chambers (1) arranged in series, numbered 1#-18#, wherein furnace chambers (1) 3#-5# are preheating zones, furnace chambers (1) 6#-8# are heating zones, and furnace chambers (1) 9#-16# are cooling zones, characterized in that, It also includes a blower frame (10) and an exhaust frame (11), wherein the blower frame (10) is located between furnace chamber 12 (1) and furnace chamber 13 (1), and the exhaust frame (11) is located between furnace chamber 14 (1) and furnace chamber 15 (1).

2. The forced cooling and combustion control system for a roasting furnace as described in claim 1, characterized in that: A partition wall (5) is provided between adjacent furnace chambers (1). Each furnace chamber (1) has three baffle walls (6) along the length of the roasting furnace. The baffle walls (6) at both ends are connected to the furnace top (3). The furnace bottom (2) has a fire passage hole (7). The middle baffle wall (6) and partition wall (5) are connected to the furnace bottom (2). The furnace top (3) has a fire passage hole (7). The baffle wall (6) and partition wall (5) together make the fire channel (4) form an S shape.

3. The forced cooling and combustion control system for a roasting furnace as described in claim 2, characterized in that: The furnace top (3) is provided with a transverse wall hole (9) that is connected to the fire hole (7) of the partition wall (5). The blower frame (10) is connected to the transverse wall hole (9) between furnace chamber 12 (1) and furnace chamber 13 (1). The exhaust frame (11) is connected to the transverse wall hole (9) between furnace chamber 14 (1) and furnace chamber 15 (1).

4. The forced cooling and combustion control system for a roasting furnace as described in claim 2, characterized in that: Each fire channel (4) has a fire channel hole (8) at the furnace top (3) corresponding to the vertical part. The two fire channel holes (8) in the No. 12 furnace chamber (1) adjacent to the blower frame (10) are closed.

5. The forced cooling and combustion control system for a roasting furnace as described in claim 4, characterized in that: The two fire holes (8) adjacent to the exhaust frame (11) are in the closed state.

6. The forced cooling and combustion control system for a roasting furnace as described in claim 1, characterized in that: It also includes a flue gas rack (12) and a combustion rack (13). The flue gas rack (12) is located between furnace chamber 2 (1) and furnace chamber 3 (1), and the combustion rack (13) is located at the top of furnace chambers 6-8 (1).

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