Graphite electrode ring type roasting furnace

Abstract

The invention discloses a graphite electrode ring type roasting furnace, and relates to the technical field of graphite electrode roasting, the graphite electrode ring type roasting furnace comprises a furnace body, a plurality of furnace chambers are arranged in the furnace body, the furnace body is provided with flues on two sides of the furnace chambers, the top of each flue is provided with a fuel hole communicated with a fuel pipe, and each flue is provided with an exhaust port communicated with an exhaust pipe; the flue comprises an air inlet cavity, a compensation cavity and a heating cavity, the air inlet cavity communicates with the fuel hole, the air inlet cavity and the compensation cavity are both located on the side portion of the air inlet cavity and communicate with the air inlet cavity, and the compensation cavity is located above the heating cavity; a plurality of compensation holes communicated with the heating cavity are formed in the bottom of the compensation cavity; a plurality of partition plates are distributed on the inner wall of the heating cavity up and down, so that smoke in the heating cavity flows in a snake shape; the device has the effect of improving the temperature uniformity of the furnace chamber of the roasting furnace and the flue gas temperature utilization rate.

Description

Technical Field

[0001] This application relates to the technical field of graphite electrode baking, and in particular to a ring baking furnace for graphite electrodes. Background Art

[0002] The production of graphite electrodes requires multiple processes. Among them, baking is to put the formed raw material embryos into a baking furnace for heating. This process will carbonize the binder and improve the electrode strength.

[0003] The structure of a graphite electrode baking furnace is generally divided into two types: an open ring baking furnace and a covered baking furnace. Among them, during the combustion process of the open ring baking furnace, coke powder will cover the top of the furnace to avoid the formation of oxides. Heat dissipation is achieved by the flow of flue gas in the flue, and the heating of the furnace chamber is realized.

[0004] For example, in the preparation method of fine-grained high-bulk-density graphite products and an open ring baking furnace with the application number 201110210083.3, a baffle structure is generally arranged in the flue of an ordinary open ring baking furnace to realize the uniform flow of flue gas in the flue and increase the residence time of flue gas in the flue. Generally speaking, the flue gas flows from one end of the flue to the other end, generally passing through the entire furnace chamber area. The temperature of the smoke inlet is higher than that of the smoke outlet, which leads to uneven temperature in the same furnace chamber and uneven quality of the baked graphite electrodes. On the other hand, the existing open ring baking furnace adjusts the temperature by controlling the intake and extraction of flue gas. Although the temperature of the furnace chamber can be adjusted, when the temperature of the furnace chamber increases, the intake and outflow efficiency of the flue gas will increase, the residence time of the flue gas in the flue will decrease, and the utilization efficiency of the flue gas temperature will also decrease. Summary of the Invention

[0005] In order to improve the defects that the existing flue structure of the ring baking furnace has low utilization efficiency of flue gas temperature and causes uneven furnace chamber temperature, this application provides a ring baking furnace for graphite electrodes.

[0006] The ring baking furnace for graphite electrodes provided by this application adopts the following technical solutions: A ring baking furnace for graphite electrodes includes a furnace body with a plurality of furnace chambers arranged inside. The furnace body is provided with flues on both sides of the furnace chamber. The top of the flue is provided with fuel holes communicated with fuel pipes, and the flue is provided with discharge ports communicated with extraction pipes; The flue includes an intake chamber, a compensation chamber and a heating chamber. The intake chamber is communicated with the fuel hole. The intake chamber and the compensation chamber are both located on the side of the intake chamber and communicated with the intake chamber. Among them, the compensation chamber is located above the heating chamber; The bottom of the compensation chamber is provided with a plurality of compensation holes communicated with the heating chamber; There are multiple partitions distributed vertically on the inner wall of the heating chamber, causing the flue gas in the heating chamber to flow in a serpentine shape; The end of the heating chamber is connected to the discharge port.

[0007] Optionally, in the direction away from the intake chamber, the opening of the compensation hole gradually increases.

[0008] Optionally, the compensation hole is inclined downward in the direction away from the intake chamber.

[0009] Optionally, the compensation hole is on the side of the partition at the top of the heating chamber facing the intake chamber.

[0010] Optionally, the ratio of the distance between the compensation hole farthest from the intake chamber and the intake chamber to the maximum distance between the compensation chamber and the intake chamber is not greater than 7:10.

[0011] Optionally, the flue is provided with a bottom chamber below the heating chamber, the bottom chamber is connected to the intake chamber, a bottom heat chamber is provided below the furnace chamber, and the bottom heat chamber is provided with multiple communication chambers communicating with the bottom chamber, and the end of the bottom heat chamber away from the intake chamber is connected to the discharge port.

[0012] Optionally, in the direction away from the intake chamber, the communication chamber is inclined from the bottom chamber to the bottom heat chamber.

[0013] Optionally, the ratio of the connection port area between the heating chamber and the intake chamber to the connection port area between the bottom chamber and the intake chamber is not less than 5:1.

[0014] Optionally, the ratio of the connection port area between the heating chamber and the intake chamber to the connection port area between the compensation chamber and the intake chamber is not less than 20:3.

[0015] Optionally, the intake chamber is located in the middle of the flue. In one flue, there are two heating chambers and two compensation chambers, which are located on both sides of the intake chamber.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. The design of the compensation chamber can not only effectively form two chambers to separate the heating chamber from the outside, but also form a greenhouse environment to reduce the heat loss of the heating chamber. At the same time, it can also compensate the hot air into the heating chamber through the compensation hole to improve the temperature uniformity in the heating chamber, and further improve the temperature uniformity in the baking chamber; 2. The position setting of the compensation hole can effectively compensate the temperature of the heating chamber while improving the utilization efficiency of the flue gas in the compensation chamber, reducing the probability that the flue gas entering the heating chamber is directly discharged; 3. The size change setting of the compensation hole can effectively cooperate with the temperature attenuation change of the heating chamber, and effectively improve the efficiency of the flue gas entering the heating chamber through the inclined setting and the opening position setting of the compensation hole, so that the flue gas in the compensation chamber can enter the heating chamber more reasonably and effectively for temperature compensation; 4. The middle position of the intake cavity can effectively reduce the overall flow length of the heating cavity, thereby reducing the variation range of temperature attenuation. This not only makes the flue structure design more reasonable but also effectively improves the temperature uniformity of the furnace chamber. 5. The bottom cavity and the bottom heating cavity can effectively heat the bottom of the heating cavity and the bottom of the furnace chamber by using the flue gas in the intake cavity, improving the temperature uniformity of the furnace chamber while enhancing the flue gas utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of Embodiment 1 of the present application; Figure 2 is a partial cross-sectional view showing the flue structure of Embodiment 1 of the present application; Figure 3 is a partial cross-sectional view showing the flue structure of Embodiment 2 of the present application; Figure 4 is a partial cross-sectional view showing the bottom heating cavity of Embodiment 2 of the present application; Figure 5 is a partial cross-sectional view showing the flue structure of Embodiment 3 of the present application; Figure 6 is a partial cross-sectional view showing the flue structure of Embodiment 4 of the present application; Figure 7 is a partial cross-sectional view showing the bottom heating cavity of Embodiment 4 of the present application.

[0018] In the figures, 1 is the furnace body; 2 is the furnace chamber; 3 is the flue; 31 is the fuel hole; 32 is the discharge port; 4 is the intake cavity; 5 is the heating cavity; 51 is the partition; 6 is the compensation cavity; 61 is the compensation hole; 7 is the bottom cavity; 71 is the communication cavity; 8 is the bottom heating cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further elaborates on the present application Figure 1-7 in conjunction with the attached drawings.

[0020] Embodiment 1 of the present application discloses a graphite electrode ring-type roasting furnace. Embodiment 1

[0021] Referring to Figure 1 and Figure 2 , the graphite electrode ring-type roasting furnace includes a furnace body 1. A plurality of furnace chambers 2 are arranged inside the furnace body 1 for roasting graphite electrodes, and the plurality of furnace chambers 2 are arranged in an array. The furnace body 1 is provided with flues 3 for heating the roasting furnace on both sides of the roasting furnace. The top of the flue 3 is provided with a fuel hole 31 communicating with a fuel tank. In this embodiment, the fuel hole 3 of the flue 3 is located at one end of the flue 3. A discharge port 32 communicating with an exhaust pipe is provided inside the flue 3.

[0022] The flue 3 includes an intake chamber 4, a compensation chamber 6, and a heating chamber 5. Among them, the intake chamber 4 is vertically arranged and is connected to the fuel hole 31. The compensation chamber 6 and the heating chamber 5 are horizontally distributed and are both connected to the intake chamber 4. The compensation chamber 6 is located above the heating chamber 5, and the compensation chamber 6 is provided with a plurality of compensation holes 61 communicating with the heating chamber 5. Thus, the flue gas in the compensation chamber 6 can enter the heating chamber 5. The inner wall of the heating chamber 5 is vertically and staggeredly distributed with a plurality of partitions 51, and the partitions 51 make the flue gas inside the heating chamber 5 flow in a serpentine and tortuous manner, increasing the flow distance and residence time of the flue gas in the heating chamber 5. The discharge port 32 is connected to one end of the heating chamber 5 away from the intake chamber 4, which is the end of the heating chamber 5. The compensation holes 61 are on the side of the partition 51 at the top of the heating chamber 5 facing the intake chamber 4. Thus, the flue gas in the compensation chamber 6 can be more effectively sucked into the heating chamber 5 as the flue gas in the heating chamber 5 flows, for temperature compensation of the heating chamber 5. In the direction away from the intake chamber 4, the opening of the compensation hole 61 gradually increases, and the compensation hole 61 is inclined downward in the direction away from the intake chamber 4. The height of the compensation chamber 6 gradually decreases in the direction away from the intake chamber 4, and the inner bottom wall of the compensation chamber 6 is inclined. The ratio of the distance between the compensation hole 61 farthest from the intake chamber 4 and the intake chamber 4 to the farthest distance between the compensation chamber 6 and the intake chamber 4 is not greater than 7:10, and the ratio adopted in this embodiment is 6.3:10. The ratio of the connection port area between the heating chamber 5 and the intake chamber 4 to the connection port area between the compensation chamber 6 and the intake chamber 4 is not less than 20:3, and the ratio adopted in this embodiment is 10:1.25.

[0023] Among them, the opening direction of the compensation hole 61 can effectively cooperate with the height change of the compensation chamber 6 to increase the rate of the flue gas entering the heating chamber 5 at different positions, so that the flue gas flow rate of the compensation hole 61 farthest from the intake chamber 4 is the highest, realizing temperature compensation for the temperature attenuation in the heating chamber 5, and thus improving the temperature uniformity in the heating chamber 5. The limitation of the opening position of the compensation hole 61 can improve the temperature compensation effect on the heating chamber 5 while ensuring the effective utilization of the flue gas in the compensation chamber 6 flowing into the heating chamber 5. Thus, the utilization rate of the flue gas temperature in the compensation chamber 6 is improved, and the probability of waste due to the direct discharge of the flue gas heat in the compensation chamber 6 is reduced. The ratio setting of the connection port area between the compensation chamber 6 and the intake chamber 4 and the connection port area between the heating chamber 5 and the intake chamber 4 can effectively control the amount of flue gas flowing from the intake chamber 4 to the compensation chamber 6, and thus ensure the utilization efficiency of the flue gas temperature in the intake chamber 4.

[0024] Among them, the chamber structures inside the flue 3 are all built by digging grooves on the inner wall of the flue 3 and then using structures such as refractory bricks, which is the same as the traditional partition erection method.

[0025] The implementation principle of Embodiment 1 of this application is as follows: After the flue gas enters the inlet chamber, it is divided into two parts for flow. One part enters the heating chamber 5 and flows through the zigzag snake-shaped space formed by the partition 51 in the heating chamber 5 to heat the heating chamber 5. The other part of the flue gas enters the compensation chamber 6 and is inhaled into different positions in the heating chamber 5 through the compensation holes 61 to perform temperature compensation on the heating chamber 5, thereby reducing the heat attenuation of the flue gas in the heating chamber 5 due to the long flow path, improving the temperature uniformity in the heating chamber 5, further improving the temperature uniformity of the furnace chamber 2, and improving the quality of the produced motor. Among them, the compensation chamber 6 can not only perform flue gas compensation on the heating chamber 5, but also separate the heating chamber 5 from the outside through the high-temperature environment formed by the flue gas in the compensation chamber 6 to reduce the temperature loss of the heating chamber 5. Embodiment 2

[0026] Reference Figure 3 and Figure 4 In this Embodiment 2, the difference from Embodiment 1 is that: the flue 3 further includes a bottom chamber 7, which is located below the heating chamber 5 and is separated by materials such as fire bricks. There is a bottom heating chamber 8 provided below the furnace chamber 2, and the bottom heating chamber 8 is provided with a plurality of connecting chambers 71 communicating with the bottom chamber 7. One end of the bottom heating chamber 8 far from the intake chamber 4 is communicated with the discharge port 32, and the bottom chamber 7 is communicated with the bottom of the intake chamber 4. The connecting chambers 71 are inclined from the bottom chamber 7 to the bottom heating chamber 8 in the direction away from the intake chamber 4. The ratio of the connection port area between the heating chamber 5 and the intake chamber 4 to the connection port area between the bottom chamber 7 and the intake chamber 4 is not less than 5:1, and the ratio in this embodiment is 5:1.

[0027] The difference in the implementation principle of Embodiment 2 of this application from that of Embodiment 1 is that: through the setting of the bottom chamber 7, part of the flue gas in the intake chamber 4 enters the bottom chamber 7, which not only forms a separate heating space below the heating chamber 5 to reduce the heat loss of the heating chamber 5, but also can transfer heat to the bottom heating chamber 8 through the connecting chambers 71 to heat the bottom space of the furnace chamber 2, thereby improving the temperature uniformity of the furnace chamber 2. Through the design of the ratio of the connection port areas, while ensuring the normal flow efficiency of the flue gas in the heating chamber 5, the utilization rate of the flue gas distributed into the bottom chamber 7 is improved, reducing the situation of waste of flue gas heat and low temperature in the heating chamber 5 caused by excessive flue gas entering the bottom chamber 7. Embodiment 3

[0028] Reference Figure 5 In this Embodiment 3, the difference from Embodiment 1 is that: the intake chamber 4 is located in the middle of the flue 3. That is, in one flue 3, both the heating chamber 5 and the compensation chamber 6 are provided with two, located on both sides of the intake chamber 4.

[0029] The difference in the implementation principle between Embodiment 3 of this application and Embodiment 1 lies in that: through the position design of the intake chamber 4 and the position design of the compensation chamber 6 and the heating chamber 5, the overall length of the heating chamber 5 can be effectively reduced, resulting in a reduction in the flue gas flow path in the heating chamber 5, and further reducing the range of flue gas temperature loss in the heating chamber 5, which can further improve the temperature uniformity of the heating chamber 5 and the furnace chamber 2. Embodiment 4

[0030] Reference Figure 6 and Figure 7 , the difference between Embodiment 4 of this application and Embodiment 2 lies in that: the intake chamber 4 is located in the middle of the flue 3. That is, in one flue 3, there are two heating chambers 5, two compensation chambers 6, two bottom chambers 7, and two bottom heating chambers 8, which are located on both sides of the intake chamber 4. Compared with Embodiment 2, the overall lengths of the heating chamber 5, the compensation chamber 6, the bottom chamber 7, and the bottom heating chamber 8 are split, reducing the flow distance of the flue gas in the flue 3, thereby reducing the loss of flue gas heat and the temperature difference in the heating chamber 5. While reducing the length of the heating chamber 5, it can also be adjusted by reducing the negative pressure of the discharge port 32 to improve the utilization rate of the flue gas temperature in the flue 3.

[0031] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The drawing ratio does not represent the actual ratio. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A ring baking furnace for graphite electrodes, comprising a furnace body (1) with a plurality of furnace chambers (2) arranged inside. The furnace body (1) is provided with flue ducts (3) on both sides of the furnace chamber (2). The top of the flue duct (3) is provided with fuel holes (31) communicated with a fuel pipe, and the flue duct (3) is provided with a discharge port (32) communicated with an exhaust pipe. It is characterized in that: The flue duct (3) comprises an air inlet chamber (4), a compensation chamber (6) and a heating chamber (5). The air inlet chamber (4) is communicated with the fuel hole (31). The air inlet chamber (4) and the compensation chamber (6) are both located on the side of the air inlet chamber (4) and communicated with the air inlet chamber (4), wherein the compensation chamber (6) is located above the heating chamber (5); A plurality of compensation holes (61) communicated with the heating chamber (5) are opened at the bottom of the compensation chamber (6); A plurality of partition plates (51) are distributed up and down on the inner wall of the heating chamber (5), so that the flue gas in the heating chamber (5) flows in a serpentine shape; The end of the heating chamber (5) is communicated with the discharge port (32).

2. The ring baking furnace for graphite electrodes according to claim 1, wherein: In the direction away from the air inlet chamber (4), the opening of the compensation hole (61) gradually increases.

3. The ring baking furnace for graphite electrodes according to claim 2, characterized in that: The compensation hole (61) is inclined downward in the direction away from the air inlet chamber (4).

4. A ring baking furnace for graphite electrodes according to claim 1, characterized in that: The compensation hole (61) is on the side of the partition plate (51) at the top of the heating chamber (5) facing the air inlet chamber (4).

5. A ring baking furnace for graphite electrodes according to claim 1, characterized in that: The ratio of the distance between the compensation hole (61) farthest from the air inlet chamber (4) and the air inlet chamber (4) to the farthest distance between the compensation chamber (6) and the air inlet chamber (4) is not greater than 7:

10.

6. The ring baking furnace for graphite electrodes according to claim 1, characterized in that: A bottom chamber (7) is arranged below the heating chamber (5) of the flue duct (3). The bottom chamber (7) is communicated with the air inlet chamber (4). A bottom heating chamber (8) is arranged below the furnace chamber (2). The bottom heating chamber (8) is provided with a plurality of communicating chambers (71) communicated with the bottom chamber (7). One end of the bottom heating chamber (8) far from the air inlet chamber (4) is communicated with the discharge port (32).

7. The ring baking furnace for graphite electrodes according to claim 6, characterized in that: The communicating chamber (71) is inclined from the bottom chamber (7) to the bottom heating chamber (8) in the direction away from the air inlet chamber (4).

8. The ring baking furnace for graphite electrodes according to claim 7, wherein: The ratio of the connection port area between the heating chamber (5) and the air inlet chamber (4) to the connection port area between the bottom chamber (7) and the air inlet chamber (4) is not less than 5:

1.

9. The ring baking furnace for graphite electrodes according to claim 1, wherein: The ratio of the connection port area between the heating chamber (5) and the air inlet chamber (4) to the connection port area between the compensation chamber (6) and the air inlet chamber (4) is not less than 20:

3.

10. A ring baking furnace for graphite electrodes according to any one of claims 1-9, characterized in that: The air inlet chamber (4) is located in the middle of the flue duct (3). In one flue duct (3), two heating chambers (5) and two compensation chambers (6) are arranged, on both sides of the air inlet chamber (4).

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