Graphite electrode ring baking furnace

Abstract

The application discloses a graphite electrode ring type baking furnace, and relates to the technical field of graphite electrode baking.The graphite electrode ring type baking furnace comprises a furnace body, a plurality of furnace chambers are arranged in the furnace body, flues are arranged on the two sides of the furnace chambers, fuel holes are arranged on the top of the flues and are communicated with fuel pipes, and exhaust outlets are arranged on the flues and are communicated with exhaust pipes; the flue comprises an air inlet cavity, a compensation cavity and a heating cavity, the air inlet cavity is communicated with the fuel hole, the heating cavity and the compensation cavity are arranged on the side of the air inlet cavity and are communicated with the air inlet cavity, and the compensation cavity is arranged above the heating cavity; a plurality of compensation holes are arranged in the bottom of the compensation cavity and are communicated with the heating cavity; a plurality of partitions are arranged on the inner wall of the heating cavity and are distributed upwards and downwards, so that the flue gas in the heating cavity flows in a snakelike mode; and the end of the heating cavity is communicated with the exhaust outlet.The graphite electrode ring type baking furnace has the effects of improving the temperature uniformity of the furnace chamber of the baking furnace and the flue gas temperature utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of graphite electrode baking, in particular to a graphite electrode baking furnace. BACKGROUND

[0002] Graphite electrode production needs to go through many links, among which baking is to put the formed raw material embryo into the baking furnace for heating, which can carbonize the binder and improve the strength of the electrode.

[0003] The structure of the graphite electrode baking furnace is generally divided into two types: open ring baking furnace and baking furnace with cover. Among them, the open ring baking furnace will cover the top of the kiln with coke powder during the combustion process to avoid the formation of oxides. Heat is dissipated through the flow of flue gas in the flue to heat the furnace chamber.

[0004] For example, the preparation method of fine particle high bulk density graphite product and open ring baking furnace with patent number 201110210083.3. Generally, the open ring baking furnace will set a baffle structure in the flue to achieve uniform flow of flue gas in the flue and increase the residence time of flue gas in the flue. Generally, flue gas flows from one end of the flue to the other end, generally passing through the entire furnace chamber area. The temperature at the inlet is higher than that at the outlet, which leads to uneven temperature in the same furnace chamber, resulting in uneven quality of baked graphite electrodes. On the other hand, the existing open ring baking furnace adjusts the temperature by controlling the amount of flue gas entering and being extracted. Although the furnace chamber temperature can be adjusted, increasing the furnace chamber temperature will increase the efficiency of flue gas entering and flowing out, reduce the residence time of flue gas in the flue, and also reduce the efficiency of flue gas temperature utilization. SUMMARY

[0005] In order to improve the defects of the existing ring baking furnace flue structure, which has low flue gas temperature utilization efficiency and uneven furnace chamber temperature, the present application provides a graphite electrode ring baking furnace.

[0006] The graphite electrode ring baking furnace provided by the present application adopts the following technical scheme:

[0007] A graphite electrode ring baking furnace, comprising a furnace body, a plurality of furnace chambers are arranged inside, a flue is arranged on both sides of the furnace chamber, a fuel hole is arranged on the top of the flue and is communicated with a fuel pipe, and an exhaust port is arranged on the flue and is communicated with an exhaust pipe;

[0008] The flue comprises an air inlet chamber, a compensation chamber and a heating chamber. The air inlet chamber is communicated with the fuel hole. The heating chamber and the compensation chamber are both located on the side of the air inlet chamber and are communicated with the air inlet chamber. The compensation chamber is located above the heating chamber;

[0009] A plurality of compensation holes are arranged on the bottom of the compensation chamber and are communicated with the heating chamber.

[0010] The inner wall of the heating cavity is provided with a plurality of partitions distributed upward and downward, so that the flue gas in the heating cavity flows in a serpentine manner;

[0011] The end of the heating cavity is communicated with the exhaust port.

[0012] Optionally, the opening of the compensation hole gradually increases in the direction away from the air inlet cavity.

[0013] Optionally, the compensation hole is inclined downward in the direction away from the air inlet cavity.

[0014] Optionally, the compensation hole is located on the side of the partition at the top of the heating cavity facing the air inlet cavity.

[0015] Optionally, the distance between the compensation hole farthest from the air inlet cavity and the air inlet cavity and the ratio of the farthest distance between the compensation cavity and the air inlet cavity are not greater than 7:10.

[0016] Optionally, the flue is provided with a bottom cavity below the heating cavity, the bottom cavity is communicated with the air inlet cavity, the furnace chamber is provided with a bottom heat cavity below, the bottom heat cavity is provided with a plurality of communication cavities communicated with the bottom cavity, and the end of the bottom heat cavity away from the air inlet cavity is communicated with the exhaust port.

[0017] Optionally, the communication cavity is inclined from the bottom cavity to the bottom heat cavity in the direction away from the air inlet cavity.

[0018] Optionally, the area ratio of the connection port between the heating cavity and the air inlet cavity and the area ratio of the connection port between the bottom cavity and the air inlet cavity is not less than 5:1.

[0019] Optionally, the area ratio of the connection port between the heating cavity and the air inlet cavity and the area ratio of the connection port between the compensation cavity and the air inlet cavity is not less than 20:3.

[0020] Optionally, the air inlet cavity is located in the middle of the flue, and two heating cavities and two compensation cavities are arranged in one flue and located on both sides of the air inlet cavity.

[0021] In summary, the present application has at least one of the following beneficial technical effects:

[0022] 1. The design of the compensation cavity not only effectively forms two cavities to separate the heating cavity from the outside, but also forms a greenhouse environment to reduce heat loss of the heating cavity, and at the same time, the hot gas flows into the heating cavity through the compensation hole to improve the uniformity of the temperature in the heating cavity, thereby improving the uniformity of the temperature in the baking cavity;

[0023] 2. The position of the compensation hole can improve the utilization efficiency of the flue gas in the compensation cavity while effectively compensating the temperature of the heating cavity, reducing the probability of direct discharge of the flue gas into the heating cavity;

[0024] 3. The size change of the compensation hole is set to effectively match the temperature decay change of the heating cavity, and the opening position of the compensation hole is set to effectively improve the efficiency of the flue gas entering the heating cavity through the inclination setting, so that the flue gas in the compensation cavity can more reasonably and effectively enter the heating cavity for temperature compensation;

[0025] 4. The middle position of the air inlet cavity is set to effectively reduce the overall flow length of the heating cavity, thereby reducing the change interval of the temperature decay, not only making the flue structure design more reasonable, but also effectively improving the uniformity of the temperature of the furnace chamber;

[0026] 5. The bottom cavity and the bottom heating cavity are set to effectively heat the bottom of the heating cavity and the bottom of the furnace chamber by using the flue gas of the air inlet cavity, thereby improving the flue gas utilization efficiency and the uniformity of the temperature of the furnace chamber. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of embodiment 1 of the present application;

[0028] Figure 2 is a partial sectional view of the flue structure of embodiment 1 of the present application;

[0029] Figure 3 is a partial sectional view of the flue structure of embodiment 2 of the present application;

[0030] Figure 4 is a partial sectional view of the bottom heating cavity of embodiment 2 of the present application;

[0031] Figure 5 is a partial sectional view of the flue structure of embodiment 3 of the present application;

[0032] Figure 6 is a partial sectional view of the flue structure of embodiment 4 of the present application;

[0033] Figure 7 is a partial sectional view of the bottom heating cavity of embodiment 4 of the present application.

[0034] In the figure, 1 is a furnace body; 2 is a furnace chamber; 3 is a flue; 31 is a fuel hole; 32 is an exhaust port; 4 is an air inlet cavity; 5 is a heating cavity; 51 is a partition; 6 is a compensation cavity; 61 is a compensation hole; 7 is a bottom cavity; 71 is a communication cavity; and 8 is a bottom heating cavity. DETAILED DESCRIPTION

[0035] The following will be described in detail in combination with the accompanying Figures 1-7 The present application will be further described in detail.

[0036] The present application discloses a graphite electrode ring type baking furnace. Embodiment 1

[0037] ReferenceFigure 1 and Figure 2 The graphite electrode ring baking furnace comprises a furnace body 1, a plurality of furnace chambers 2 are arranged inside the furnace body 1 for baking graphite electrodes, and the plurality of furnace chambers 2 are arrayed. The furnace body 1 is provided with flues 3 for heating the baking furnace on both sides of the baking furnace. The flues 3 are provided with fuel holes 31 communicating with fuel tanks at the top, and in the embodiment, the flue holes are located at one end of the flue 3. The flue 3 is provided with exhaust ports 32 communicating with exhaust pipes.

[0038] The flue 3 comprises an air inlet cavity 4, a compensation cavity 6 and a heating cavity 5. The air inlet cavity 4 is vertically arranged and communicates with the fuel hole 31. The compensation cavity 6 and the heating cavity 5 are horizontally distributed and communicate with the air inlet cavity 4, the compensation cavity 6 is located above the heating cavity 5, and the compensation cavity 6 is provided with a plurality of compensation holes 61 communicating with the heating cavity 5. In turn, the flue gas in the compensation cavity 6 can enter the heating cavity 5. A plurality of baffles 51 are staggered on the inner wall of the heating cavity 5, the baffles 51 make the flue gas in the heating cavity 5 flow in a serpentine manner, and the flow distance and residence time of the flue gas in the heating cavity 5 are improved. The exhaust port 32 communicates with the end of the heating cavity 5 away from the air inlet cavity 4. The compensation hole 61 is located on the side of the baffle 51 at the top of the heating cavity 5 facing the air inlet cavity 4, and in turn, the flue gas in the compensation cavity 6 can be more effectively sucked into the heating cavity 5 along the flue gas flow in the heating cavity 5, and the temperature of the heating cavity 5 is compensated. In the direction away from the air inlet cavity 4, the opening of the compensation hole 61 gradually increases, and the compensation hole 61 is arranged downwardly inclined in the direction away from the air inlet cavity 4. The height of the compensation cavity 6 gradually decreases in the direction away from the air inlet cavity 4, and the bottom wall of the compensation cavity 6 is inclined. The ratio of the distance between the compensation hole 61 farthest from the air inlet cavity 4 and the air inlet cavity 4 to the farthest distance between the compensation cavity 6 and the air inlet cavity 4 is not greater than 7:10, and the ratio adopted in the embodiment is 6.3:10. The ratio of the connection port area of the heating cavity 5 to the air inlet cavity 4 to the connection port area of the compensation cavity 6 to the air inlet cavity 4 is not less than 20:3, and the ratio adopted in the embodiment is 10:1.25.

[0039] The orientation of the compensation hole 61 effectively coordinates with the height variation of the compensation cavity 6 to increase the rate at which flue gas enters the heating cavity 5 at different locations. This ensures that the flue gas flow rate is highest at the compensation hole 61 furthest from the inlet cavity 4, achieving temperature compensation to compensate for temperature decay within the heating cavity 5 and thus improving temperature uniformity. The restricted location of the compensation hole 61 ensures effective utilization of the flue gas flowing into the heating cavity 5 while enhancing the temperature compensation effect. This improves the utilization rate of flue gas temperature within the compensation cavity 6 and reduces the probability of heat being directly discharged and wasted. The ratio of the area of ​​the connection between the compensation cavity 6 and the inlet cavity 4 to the area of ​​the connection between the heating cavity 5 and the inlet cavity 4 effectively controls the amount of flue gas flowing from the inlet cavity 4 to the compensation cavity 6, thereby ensuring efficient utilization of flue gas temperature within the inlet cavity 4.

[0040] The chamber structure inside flue 3 is constructed by excavating grooves in the inner wall of flue 3 and building it with refractory bricks and other structures, which is the same as the traditional method of partition wall construction.

[0041] The implementation principle of Embodiment 1 of this application is as follows: After the flue gas enters the inlet cavity, it flows in two parts. One part enters the heating cavity 5 and flows through the tortuous serpentine space formed by the baffle 51 in the heating cavity 5, heating the heating cavity 5. The other part of the flue gas enters the compensation cavity 6 and is drawn into different positions in the heating cavity 5 through the compensation hole 61, compensating for the temperature of the heating cavity 5. This reduces the heat loss caused by the long flow path of the flue gas in the heating cavity 5, improves the temperature uniformity in the heating cavity 5, and thus improves the temperature uniformity of the furnace chamber 2, improving the quality of the produced motors. The compensation cavity 6 not only compensates for the flue gas in the heating cavity 5 but also isolates the heating cavity 5 from the outside through the high-temperature environment created by the flue gas in the compensation cavity 6, reducing the temperature loss of the heating cavity 5. Example 2

[0042] refer to Figure 3 and Figure 4 The difference between Embodiment 2 and Embodiment 1 is that the flue 3 further includes a bottom cavity 7, which is located below the heating chamber 5 and separated by materials such as fireproof bricks. A bottom heating cavity 8 is provided below the furnace chamber 2, and the bottom heating cavity 8 has multiple connecting cavities 71 that communicate with the bottom cavity 7. The end of the bottom heating cavity 8 away from the air inlet chamber 4 communicates with the outlet 32, and the bottom cavity 7 communicates with the bottom of the air inlet chamber 4. The connecting cavities 71 are inclined from the bottom cavity 7 towards the bottom heating cavity 8 in a direction away from the air inlet chamber 4. The ratio of the connection area between the heating chamber 5 and the air inlet chamber 4 to the connection area between the bottom cavity 7 and the air inlet chamber 4 is not less than 5:1; in this embodiment, the ratio is 5:1.

[0043] The implementation of Embodiment 2 of this application differs from Embodiment 1 in that: by setting up the bottom cavity 7, a portion of the flue gas from the inlet cavity 4 enters the bottom cavity 7, not only forming a separate heating space below the heating cavity 5 to reduce heat loss from the heating cavity 5, but also transferring temperature to the bottom heating cavity 8 through the connecting cavity 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 area, in addition to ensuring the normal flow efficiency of the flue gas in the heating cavity 5, the utilization rate of the flue gas allocated to the bottom cavity 7 is improved, reducing the waste of flue gas heat and the low temperature of the heating cavity 5 caused by excessive flue gas entering the bottom cavity 7. Example 3

[0044] refer to Figure 5 The difference between Embodiment 3 and Embodiment 1 is that the air intake chamber 4 is located in the middle of the flue 3. That is, within one flue 3, there are two heating chambers 5 and two compensation chambers 6, located on both sides of the air intake chamber 4.

[0045] The difference between the implementation principle of Embodiment 3 and Embodiment 1 is that by designing the position of the air inlet chamber 4, the position of the compensation chamber 6, and the heating chamber 5, the overall length of the heating chamber 5 can be effectively reduced, thereby reducing the flue gas flow path in the heating chamber 5 and 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. Example 4

[0046] refer to Figure 6 and Figure 7 The difference between Embodiment 4 and Embodiment 2 is that the air inlet chamber 4 is located in the middle of the flue 3. That is, within one flue 3, there are two heating chambers 5, two compensation chambers 6, two bottom chambers 7, and two bottom heating chambers 8, located on either side of the air inlet chamber 4. Compared to Embodiment 2, the overall length of the heating chamber 5, the compensation chamber 6, the bottom chamber 7, and the bottom heating chamber 8 is divided, reducing the flow distance of the flue gas within the flue 3, thereby reducing heat loss and the temperature difference within the heating chamber 5. While reducing the length of the heating chamber 5, the negative pressure at the outlet 32 ​​can also be adjusted, improving the utilization rate of the flue gas temperature within the flue 3.

[0047] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. The scale of the accompanying drawings does not represent the actual scale. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A graphite electrode ring calcination furnace, comprising a furnace body (1) internally provided with a plurality of furnace chambers (2), flues (3) being formed on both sides of the furnace chambers (2), fuel holes (31) being formed at the top of the flues (3) and communicating with fuel pipes, and exhaust ports (32) being formed in the flues (3) and communicating with exhaust pipes, characterized in that: the flues (3) comprise an air inlet cavity (4), a compensation cavity (6) and a heating cavity (5), the air inlet cavity (4) communicates with the fuel holes (31), the heating cavity (5) and the compensation cavity (6) are both located on the side of the air inlet cavity (4) and communicate with the air inlet cavity (4), and the compensation cavity (6) is located above the heating cavity (5); a plurality of compensation holes (61) are formed in the bottom of the compensation cavity (6) and communicate with the heating cavity (5); a plurality of partitions (51) are distributed on the inner wall of the heating cavity (5) in an up-down manner, so that the flue gas in the heating cavity (5) flows in a serpentine manner; the end of the heating cavity (5) communicates with the exhaust port (32); in the direction away from the air inlet cavity (4), the opening of the compensation hole (61) gradually increases; the compensation hole (61) is inclined downward in the direction away from the air inlet cavity (4); the flue (3) is provided with a bottom cavity (7) below the heating cavity (5), the bottom cavity (7) communicates with the air inlet cavity (4), the furnace chamber (2) is provided with a bottom heat cavity (8) below, the bottom heat cavity (8) is provided with a plurality of communication cavities (71) communicating with the bottom cavity (7), and one end of the bottom heat cavity (8) away from the air inlet cavity (4) communicates with the exhaust port (32); the communication cavity (71) is inclined from the bottom cavity (7) to the bottom heat cavity (8) in the direction away from the air inlet cavity (4); the height of the compensation cavity (6) gradually decreases in the direction away from the air inlet cavity (4), and the bottom wall of the compensation cavity (6) is inclined. The compensation hole (61) is located on the side of the partition (51) at the top of the heating cavity (5) facing the air inlet cavity (4).

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

10.

3. A graphite electrode ring calcining furnace according to claim 1, characterized in that: The ratio of the connection port area of the heating cavity (5) and the air inlet cavity (4) to the connection port area of the bottom cavity (7) and the air inlet cavity (4) is not less than 5:

1.

4. A graphite electrode ring calcining furnace according to claim 1, characterized in that: The ratio of the connection port area of the heating cavity (5) and the air inlet cavity (4) to the connection port area of the compensation cavity (6) and the air inlet cavity (4) is not less than 20:

3.

5. A graphite electrode ring calcining furnace according to claim 1, characterized in that: The air inlet cavity (4) is located in the middle of the flue (3), and two heating cavities (5) and two compensation cavities (6) are provided in one flue (3) and located on both sides of the air inlet cavity (4).

6. A graphite electrode annular baking furnace according to any one of claims 1 to 5, characterized in that: ​

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