Vertical direct-fired graphite expansion furnace

Abstract

The utility model relates to the technical field of heat treatment, in particular to a vertical direct-fired graphite expansion furnace. The graphite expansion furnace comprises an expansion furnace, a burner and a discharge port, further, the expansion furnace consists of a lower elbow straight section furnace, a vertical straight section furnace and an upper elbow furnace, the burner is arranged at one transverse end of the lower elbow straight section furnace, the discharge port is arranged at one downward end of the upper elbow furnace, and the graphite expansion furnace further comprises a feed port, the feeding hole is communicated with the lower part of the vertical straight-section furnace, and the burner is arranged towards the feeding hole. The product has the advantages of energy conservation, high efficiency, low energy consumption, high production rate, high product yield, high product purity and the like, and the furnace body of the product adopts a split nodular structure, can be installed in a user-defined manner, and is convenient to install and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment, in particular to a vertical direct-fired graphite expansion furnace. Background Art

[0002] The existing graphite expansion furnace has a simple structure and mainly has the following defects:

[0003] 1. Impurities will be mixed in the high-temperature expanded graphite process;

[0004] 2. The furnace is large and inconvenient to install;

[0005] 3. The product purity is not high, the production efficiency is low and the energy consumption is high. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies of the prior art, the utility model provides a vertical direct-fired graphite expansion furnace, which is characterized by convenient and quick installation and high production efficiency.

[0008] (II) Technical solution

[0009] A vertical direct-fired graphite puffing furnace comprises a puffing furnace, a burner and a discharge port. Furthermore, the puffing furnace is composed of a lower elbow straight section furnace, a vertical straight section furnace and an upper elbow furnace. A burner is provided at one lateral end of the lower elbow straight section furnace, and a discharge port is provided at the downward end of the upper elbow furnace. The furnace also comprises a feed port, which is connected to the lower part of the vertical straight section furnace, and the burner is arranged toward the feed port.

[0010] Preferably, the vertical straight section furnace is composed of a plurality of furnace sections, and the furnace sections are assembled and nested with each other.

[0011] Preferably, the structures of each furnace section, the lower elbow straight section furnace and the upper elbow furnace are composed of a silicon carbide liner, a high temperature resistant castable, an aluminum silicate fiber block and a furnace shell from the inside to the outside.

[0012] Preferably, a plurality of thermocouples are also included, which are respectively arranged at the lower elbow straight section furnace, the vertical straight section furnace and the upper elbow furnace.

[0013] Preferably, a plurality of thermocouples are arranged at equal intervals in the vertical straight section furnace.

[0014] Preferably, the lower elbow straight section furnace is provided with a furnace cover, and the burner is installed on the furnace cover through burner bricks.

[0015] Preferably, the furnace sections are supported by high-alumina bricks.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a new type of vertical direct-fired graphite puffing furnace. This product can adjust the temperature continuously to avoid excessive fluctuations or even shutdown of the fire, which causes instability of the production line and stops the furnace. Combined with reasonable insulation material settings, the temperature rise of the outer wall of the furnace shell is less than 15°C, which is far lower than the industrial furnace standard, reducing heat loss and thus reducing energy consumption. Since the heat of the burner directly acts on the inside of the furnace, the heating rate in the furnace is very fast, and the oxygen-poor flue gas generated by combustion is used to feed the material, which is beneficial to the oxidation loss of the raw materials. Therefore, the graphite high-temperature puffing furnace has the advantages of energy saving and high efficiency, low energy consumption, high productivity, high product yield, and high product purity. In addition, the furnace body of this product adopts a split-type segmented structure, which can be customized and installed, and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the main cross-sectional view of this product;

[0019] Figure 2 for Figure 1 Sectional view of AA.

[0020] Explanation of reference numerals: lower elbow straight section furnace 1, vertical straight section furnace 2, upper elbow furnace 3, burner 4, discharge port 5, feed port 6, silicon carbide liner 7, high temperature resistant castable 8, aluminum silicate fiber block 9, furnace shell 10, furnace section 11, thermocouple 12, furnace cover 13, burner brick 14, high alumina brick 15. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings, wherein the same components are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower", "bottom surface" and "top surface" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Design concept: Design a graphite expansion furnace that is easy and quick to install and has high working efficiency.

[0024] Example:

[0025] like Figure 1 and Figure 2As shown, the technical solution provided by the utility model is a vertical direct-fired graphite puffing furnace, including a puffing furnace, a burner 4 and a discharge port 5. Further, the puffing furnace is composed of a lower elbow straight section furnace 1, a vertical straight section furnace 2 and an upper elbow furnace 3. The lower elbow straight section furnace 1 is provided with a burner 4 at one lateral end, and the upper elbow furnace 3 is provided with a discharge port 5 at one downward end; it also includes a feed port 6, the feed port 6 is connected to the lower part of the vertical straight section furnace 2, and the burner 4 is arranged toward the feed port 6. More specifically, the lower elbow straight section furnace 1 is provided with a furnace cover 13, and the burner 4 is installed on the furnace cover 13 through a burner brick 14.

[0026] The vertical straight section furnace 2 of this embodiment is composed of a plurality of furnace sections 11, each furnace section 11 is assembled and nested with each other, each furnace section 11 is supported by high-aluminum bricks 15, and the furnace sections 11 can be increased or decreased to adjust the height of the entire furnace body when necessary. Each furnace section 11, the lower elbow straight section furnace 1 and the upper elbow furnace 3 of this product are composed of a silicon carbide liner 7, a high temperature resistant castable 8, an aluminum silicate fiber block 9 and a furnace shell 10 from the inside to the outside.

[0027] This embodiment further includes a plurality of thermocouples 12, which are respectively arranged at the lower elbow straight section furnace 1, the vertical straight section furnace 2 and the upper elbow furnace 3. In order to ensure the accuracy of temperature measurement, a plurality of thermocouples 12 are equidistantly spaced at the vertical straight section furnace 2.

[0028] Working principle and process:

[0029] The graphite expansion furnace of this product is a vertical structure. A burner 4 is set at the lower elbow straight section furnace 1 for graphite expansion heat source. A feed port 6 is set on one side of the lower elbow straight section furnace 1. The entire furnace body of this product for passing graphite raw materials is made of silicon carbide inner liner 7 in sections. It has the advantages of high temperature resistance, no deformation and no powder shedding. A nested structure is made at the interface to avoid foreign matter falling at the joint. In the past, the furnace was cast, and the powder fell off and mixed into the product after high temperature, resulting in scrap. The high temperature resistant castable 8 is filled outside the silicon carbide inner liner 7 to wrap the silicon carbide inner liner 7, and the outer layer of the high temperature resistant castable 8 is filled with aluminum silicate fiber blocks 9 for heat preservation, which slows down heat loss and achieves energy saving. Then the outermost is the furnace shell 10, which is modularized with the inner furnace insulation material, etc., for easy production and installation; a longer straight section of the furnace is set above the bottom elbow, so that the graphite has enough time to absorb heat and expand during its transportation. Workers use a screw feeder to continuously feed the graphite raw material into the furnace of the expansion furnace from the feed port 6 at the bottom elbow. The high-temperature hot air flow generated by the high-speed burner 4 sends it upward from the bottom elbow and is heated by the hot air flow during the movement. It starts to expand after reaching the expansion temperature and finally reaches the discharge port 5 through the two upper elbows to enter the subsequent compaction and plate making assembly line process.

[0030] This product has four thermocouples 12 set at the lower elbow, the straight section and the upper elbow of the expansion furnace. The thermocouple 12 at the lower elbow is used to control the temperature of the high-speed burner 4, and the other three are used to monitor the temperature. It can cooperate with the external automatic temperature control system to achieve continuous temperature adjustment to avoid excessive fluctuations or even shutdown of the production line due to instability and furnace shutdown. Combined with reasonable insulation material settings, the temperature rise of the outer wall of the furnace shell is less than 15°C, which is far lower than the industrial furnace standard, reducing heat loss and thus reducing energy consumption. Since the heat of the burner 4 directly acts on the inside of the furnace, the heating rate in the furnace is very fast, and the oxygen-poor flue gas generated by combustion is used to feed the material, which is beneficial to the oxidation loss of the raw materials. Therefore, the graphite high-temperature expansion furnace has the advantages of energy saving and high efficiency, low energy consumption, high productivity, high product yield, and high product purity.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vertical direct-fired graphite expansion furnace, comprising an expansion furnace, a burner and a discharge port, characterized in that: The puffing furnace is composed of a lower elbow straight section furnace, a vertical straight section furnace and an upper elbow furnace. A burner is provided at one horizontal end of the lower elbow straight section furnace, and a discharge port is provided at the downward end of the upper elbow furnace. It also includes a feed port, which is connected to the lower part of the vertical straight section furnace, and the burner is arranged toward the feed port.

2. A vertical direct-fired graphite expansion furnace according to claim 1, characterized in that: The vertical straight section furnace is composed of a plurality of furnace sections, and the furnace sections are assembled and nested with each other.

3. A vertical direct-fired graphite expansion furnace according to claim 2, characterized in that: The structures of each furnace section, the lower elbow straight section furnace and the upper elbow furnace are composed of a silicon carbide liner, a high temperature resistant castable, an aluminum silicate fiber block and a furnace shell from the inside to the outside.

4. A vertical direct-fired graphite expansion furnace according to claim 1, characterized in that: The invention also comprises a plurality of thermocouples which are respectively arranged at the lower elbow straight section furnace, the vertical straight section furnace and the upper elbow furnace.

5. A vertical direct-fired graphite expansion furnace according to claim 4, characterized in that: A plurality of thermocouples are arranged at equal intervals in the vertical straight section furnace.

6. A vertical direct-fired graphite expansion furnace according to claim 1, characterized in that: The lower elbow straight section furnace is provided with a furnace cover, and the burner is installed on the furnace cover through the burner bricks.

7. A vertical direct-fired graphite expansion furnace according to claim 2, characterized in that: The various furnace sections are supported by high-alumina bricks.

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