An ultra-high temperature gas exhaust duct structure for a graphitization furnace

Abstract

The utility model provides a kind of ultrahigh temperature gas exhaust pipeline structure for graphitization furnace, including the waste gas pipeline for discharging waste gas in graphitization furnace cavity, at least one cooling component is arranged in the vicinity of waste gas inlet of waste gas pipeline, the waste gas inlet is communicated with inside graphitization furnace cavity, at least one cooling component is arranged in the vicinity of waste gas outlet of waste gas pipeline, and the waste gas outlet of waste gas pipeline is communicated with outside by electric valve control.The high-temperature exhaust structure can timely remove oxygen in the graphitization furnace, and maintain long-term continuous stable operation of the graphitization furnace.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-temperature heat treatment equipment, and in particular relates to an ultra-high temperature gas exhaust pipeline structure for a graphitization furnace. Background Technology

[0002] One of the factors affecting the long-term, continuous, and stable operation of graphitization furnaces is oxidation. The filaments enter from the furnace opening, bringing in oxygen that causes long-term oxidative corrosion to the internal structure. The insulation felt material becomes porous in the oxidizing environment, gradually increasing its thermal conductivity. Simultaneously, the lifespan of the muffle chamber is shortened. The graphite electrodes react with residual oxygen to generate CO / CO2, leading to a smaller electrode diameter, increased resistance, increased load on the external transformer, and increased energy consumption. To solve this problem, positive pressure must be maintained inside the furnace, with evacuation from the top of the inlet filaments. However, the existing high-carbon exhaust structure is unsuitable for graphitization furnaces because the exhaust gas temperature is around 1800℃-2000℃, which the original exhaust pipes cannot withstand. Therefore, the exhaust pipe structure must be redesigned to meet the requirements. Utility Model Content

[0003] In view of this, the present invention aims to propose an ultra-high temperature gas exhaust pipe structure for graphitization furnaces, so as to solve the problem of high temperature exhaust gas discharge and reduce the oxidation of graphitization furnaces.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A structure for an ultra-high temperature gas exhaust pipe for a graphitization furnace includes an exhaust pipe for discharging exhaust gas from the furnace cavity, at least one cooling component is provided near the exhaust gas inlet of the exhaust pipe, the exhaust gas inlet is connected to the interior of the graphitization furnace cavity, at least one cooling component is provided near the exhaust gas outlet of the exhaust pipe, and the exhaust gas outlet of the exhaust pipe is connected to the outside via an electric valve.

[0006] Furthermore, the exhaust gas pipeline includes a horizontally placed exhaust gas pipeline one, and a vertically placed exhaust gas pipeline two and exhaust gas pipeline three, which are connected to each other.

[0007] Exhaust gas pipe two and exhaust gas pipe three are located at both ends of exhaust gas pipe one. Exhaust gas pipe two includes an exhaust gas inlet, and exhaust gas pipe three includes an exhaust gas outlet.

[0008] Furthermore, a water-cooled flow channel partition is wrapped around the outside of exhaust gas duct 2 and exhaust gas duct 1. The water-cooled flow channel partition includes a water-cooled channel for circulating water, and the water-cooled channel is arranged around the outer wall of exhaust gas duct 2 and exhaust gas duct 1.

[0009] Furthermore, the primary cooling component includes a water-cooled pipe, and the second exhaust gas pipe is installed at one end of the first exhaust gas pipe. The second exhaust gas pipe has a water-cooled pipe installed at one end and an exhaust gas inlet at the other end. The end of the second exhaust gas pipe with the water-cooled pipe is wrapped with insulation material.

[0010] Furthermore, the third exhaust gas pipe is installed at the other end of the first exhaust gas pipe corresponding to the second exhaust gas pipe. A cold water pipe is installed at the first exhaust gas pipe at the corresponding end. One end of the third exhaust gas pipe is the exhaust gas outlet, and the other end of the third exhaust gas pipe is installed at a preset position through a flange. The flange end of the third exhaust gas pipe is wrapped with thermal insulation material.

[0011] Furthermore, the primary cooling assembly also includes a flange with a water-cooled groove, and the exhaust gas inlet is fixed to a preset position via the flange with the water-cooled groove.

[0012] Furthermore, both ends of the exhaust pipe are wrapped with thermal insulation material.

[0013] Furthermore, a temperature sensor and a differential pressure sensor for detecting the exhaust gas inside the pipe are installed at one of the housings of the exhaust pipe.

[0014] Furthermore, the exhaust gas duct is supported outside the graphitization furnace by a waste discharge support frame.

[0015] Compared with existing technologies, the ultra-high temperature gas exhaust pipe structure for graphitization furnaces described in this utility model has the following advantages:

[0016] The high-temperature waste removal structure described in this invention can promptly remove oxygen from the graphitization furnace, maintaining its long-term, continuous, and stable operation. This structure prevents oxygen introduced during operation from oxidizing and corroding the furnace's internal structure. In an oxidizing environment, the insulation material becomes porous, its thermal conductivity increases, and the muffle chamber's lifespan is shortened. Furthermore, the graphite electrodes react with residual oxygen to generate CO / CO2, resulting in a smaller electrode diameter, increased resistance, increased load on the external transformer, and increased energy consumption. Attached Figure Description

[0017] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0018] Figure 1 This is a schematic diagram of an ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 Enlarged view of the central CC section;

[0020] Figure 3 for Figure 1 Enlarged view of the middle DD section.

[0021] Explanation of reference numerals in the attached figures:

[0022] 27. Flange with water-cooled tank; 28. Electric valve; 29. ​​Exhaust gas duct; 291. Exhaust gas duct one; 292. Exhaust gas duct two; 293. Exhaust gas duct three; 30. Water-cooled flow channel partition; 31. Thermal insulation material; 32. Flange; 33. Water-cooled pipe; 34. Temperature sensor; 35. Differential pressure sensor; 36. Waste discharge support frame; Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] like Figure 1-3As shown, the high-temperature waste discharge structure includes a waste gas pipe 29 for discharging waste gas from the graphitization furnace cavity. At least one cooling component is installed near the waste gas inlet of the waste gas pipe 29, which is connected to the interior of the graphitization furnace cavity. At least one cooling component is installed near the waste gas outlet of the waste gas pipe, which is connected to the outside via an electric valve 28. The high-temperature waste discharge structure is located between the rear side of the furnace inlet and the front side of the muffle cavity inlet to address the problem of oxidative damage to the furnace structure caused by oxygen introduced by the carbon fiber bundles during high-speed production.

[0028] Furthermore, the exhaust gas duct 29 includes a horizontally placed exhaust gas duct 291, and a vertically placed exhaust gas duct 292 and exhaust gas duct 3 293, which are connected to each other.

[0029] Exhaust gas pipe 292 and exhaust gas pipe 3 293 are located at opposite ends of exhaust gas pipe 1 291. Exhaust gas pipe 292 includes an exhaust gas inlet, and exhaust gas pipe 3 293 includes an exhaust gas outlet.

[0030] The primary cooling assembly includes a water-cooled pipe 33 and may also include a flange 27 with a water-cooled groove.

[0031] The second exhaust gas pipe 292 is installed at one end of the first exhaust gas pipe 291, and a water-cooling pipe 33 is installed at one end of the second exhaust gas pipe 292. The other end is the exhaust gas inlet, which is connected to the inside of the graphitization furnace cavity. The exhaust gas inlet is fixed to a preset position by a flange 27 with a water-cooling groove, which can extract high-temperature exhaust gas at about 2000℃.

[0032] Exhaust gas duct 3 293 is installed at the other end of exhaust gas duct 1 291. A cold water pipe is installed at the corresponding end of exhaust gas duct 1 291. An electric valve 28 for controlling the connection to the outside is installed at one end of exhaust gas duct 3 293, and the other end is installed in a preset position through a flange.

[0033] A water-cooled flow channel partition 30 is wrapped around the outside of exhaust gas duct 292 and exhaust gas duct 291. The water-cooled flow channel partition 30 includes a water-cooled channel for circulating water, and the water-cooled channel is arranged around the outer wall of exhaust gas duct 292 and exhaust gas duct 291.

[0034] The high-temperature waste discharge structure 6 adds a water-cooling structure to the outer wall of the pipe and 33 water-cooling pipes inside to solve the problem of not being able to extract ultra-high temperature gas.

[0035] Furthermore, the two ends of exhaust gas pipe 1 291 are wrapped with insulation material 31, the flange end of exhaust gas pipe 3 293 is wrapped with insulation material 31, and the end of exhaust gas pipe 2 292 that is installed with water cooling pipe 33 is wrapped with insulation material 31.

[0036] Furthermore, a temperature sensor 34 and a differential pressure sensor 35 for detecting the exhaust gas inside the pipe are installed at the casing of the exhaust gas duct 291. These are used to monitor the exhaust gas status parameters in real time, and the overall structure is stably supported by the exhaust gas support frame 36.

[0037] The electric valve 28 can automatically adjust its opening according to the wire feeding speed to precisely control the extraction rate. The exhaust gas duct 29 is equipped with a dual cooling and insulation assembly consisting of a water-cooled pipe 33 mounted on the flange 32 and insulation material 31. The water-cooled pipe 33 is used to further reduce the exhaust gas temperature, while the insulation material 31 provides thermal insulation protection for the pipe wall without cooling channels. This assembly adopts a modular design that can be completely extracted (two sets in total), which facilitates the cleaning of waste material from the inner pipe wall.

[0038] This waste discharge structure achieves the technical effects of long-term stable extraction of high-temperature waste gas, effective discharge of oxygen brought in by the filament bundle, and maintenance of a stable atmosphere inside the furnace.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for an ultra-high temperature gas exhaust pipe for a graphitization furnace, characterized in that: It includes a waste gas pipe (29) for discharging waste gas from the graphitization furnace cavity, at least one cooling component is provided near the waste gas inlet of the waste gas pipe (29), the waste gas inlet is connected to the inside of the graphitization furnace cavity, at least one cooling component is provided near the waste gas outlet of the waste gas pipe (29), and the waste gas outlet of the waste gas pipe (29) is connected to the outside through an electric valve (28).

2. The ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to claim 1, characterized in that: The exhaust gas duct (29) includes a horizontally placed exhaust gas duct one (291), and a vertically placed exhaust gas duct two (292) and exhaust gas duct three (293), and exhaust gas duct one (291), exhaust gas duct two (292), and exhaust gas duct three (293) are connected to each other; Exhaust gas pipe two (292) and exhaust gas pipe three (293) are located at both ends of exhaust gas pipe one (291). Exhaust gas pipe two (292) includes an exhaust gas inlet, and exhaust gas pipe three (293) includes an exhaust gas outlet.

3. The ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to claim 2, characterized in that: A water-cooled flow channel partition (30) is wrapped around the outside of exhaust gas duct 2 (292) and exhaust gas duct 1 (291). The water-cooled flow channel partition (30) includes a water-cooled channel for circulating water, and the water-cooled channel is arranged around the outer wall of exhaust gas duct 2 (292) and exhaust gas duct 1 (291).

4. The ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to claim 2, characterized in that: The primary cooling assembly includes a water-cooled pipe (33), and a second exhaust gas pipe (292) is installed at one end of the first exhaust gas pipe (291). The second exhaust gas pipe (292) has a water-cooled pipe (33) installed at one end and an exhaust gas inlet at the other end. The end of the second exhaust gas pipe (292) with the water-cooled pipe (33) installed is wrapped with insulation material (31).

5. The ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to claim 2, characterized in that: The exhaust gas pipe three (293) is installed at the other end of the exhaust gas pipe one (291) corresponding to the exhaust gas pipe two (292). A cold water pipe is installed on the exhaust gas pipe one (291) at the corresponding end. One end of the exhaust gas pipe three (293) is the exhaust gas outlet. The other end of the exhaust gas pipe three (293) is installed in a preset position through a flange. The flange end of the exhaust gas pipe three (293) is wrapped with thermal insulation material (31).

6. The ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to claim 1, characterized in that: The primary cooling assembly also includes a flange (27) with a water-cooled groove, and the exhaust gas inlet is fixed to a preset position by the flange (27) with the water-cooled groove.

7. The ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to claim 2, characterized in that: The two ends of the exhaust pipe are wrapped with thermal insulation material (31).

8. The ultra-high temperature gas exhaust pipe structure for a graphitization furnace according to claim 2, characterized in that: A temperature sensor (34) and a differential pressure sensor (35) for detecting the exhaust gas inside the pipe are installed on the casing of the exhaust gas pipe (291).

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