A structure of a bottom opening door electric furnace of air extraction type

Abstract

The utility model relates to a structure of a bottom opening door electric furnace of air extraction, relates to high temperature electric furnace technical field, including furnace body, furnace door and furnace door lifting mechanism, and the furnace door is sealedly connected with the lower opening of furnace body through furnace door lifting mechanism, the furnace body includes furnace shell, heat insulation brick, furnace lining brick and heating element arranged in turn from outside to inside, and a plurality of round hole exhaust holes are evenly arranged around the furnace lining brick at the bottom of hearth, the exhaust hole vertically extends to the heat insulation brick in the lower part from the bottom surface of hearth, then extends to the heat insulation brick of furnace side wall horizontally, continues vertically upward to the upper part of furnace body, and is connected to the main pipeline through the metal pipe from the upper part of furnace body, the utility model discloses simple and compact structure, not only can discharge the volatile matter inside hearth in time, avoids the corrosion of volatile matter to furnace lining and heating element, prolongs the service life of electric furnace, and can organize the volatile matter and discharge waste gas treatment device, avoids the pollution of volatile matter to atmospheric environment.

Description

Technical Field

[0001] This utility model relates to the technical field of high-temperature electric furnaces, and in particular to a structure of a bottom-opening, exhaust-type electric furnace. Background Technology

[0002] As is well known, with the rapid development of various industries in my country, high-temperature electric furnaces are increasingly widely used in various industries. However, the materials or products (calcined products) calcined in the electric furnace during use usually produce a certain amount of gaseous volatiles at high temperatures. The composition of these volatiles is mainly divided into the following categories: (1) CO2 and unburned residual C produced by the combustion of organic binders or additives. These residual C usually escape from the gaps of the heating element of the electric furnace and deposit around the cold end or terminals of the heating element, which can easily cause short circuits or arcing and damage to the heating element; (2) Acid radicals or acidic oxides generated by the decomposition of inorganic salts. These acidic volatiles have a strong corrosive effect on the furnace lining and heating element, affecting the service life of the furnace lining and heating element; (3) Gaseous ions volatilized at high temperatures, such as Na + K + B 3+ Cr 3+ These high-temperature gaseous ions are also highly corrosive, similarly affecting the service life of the electric furnace. During high-temperature operation, these volatiles accumulate in the furnace chamber of a conventional electric furnace, causing significant corrosion to the furnace lining and heating elements, directly impacting their lifespan. Furthermore, these high-temperature volatiles can diffuse out of the furnace through gaps in the furnace body, polluting the surrounding atmosphere. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, this utility model discloses a bottom-opening electric furnace structure with exhaust gas.

[0004] To achieve the aforementioned objective, this utility model adopts the following technical solution:

[0005] A bottom-opening, exhaust-type electric furnace structure includes a furnace body, a furnace door, and a furnace door lifting mechanism. The furnace door is sealed to the lower opening of the furnace body via the furnace door lifting mechanism. The furnace body comprises a furnace shell, heat-insulating bricks, furnace lining bricks, and heating elements arranged sequentially from the outside to the inside, thus forming the furnace chamber. In normal use, the furnace door lifting mechanism is first lowered to the open position, such as... Figure 1 As shown, place the calcined material on the furnace door, and then raise the furnace door lifting mechanism to the closed position, as shown. Figure 2 As shown, this forms a closed furnace.

[0006] Specifically, several round exhaust holes are evenly arranged around the furnace lining bricks at the bottom of the furnace. The exhaust holes extend vertically downwards from the bottom of the furnace into the lower heat-insulating bricks, then horizontally into the heat-insulating bricks of the furnace side wall, and continue vertically upwards to the upper part of the furnace body. From the upper part of the furnace body, they are connected to the main pipeline through a metal pipe. The exhaust holes pass through the furnace wall, which allows the heat of the extracted hot gas to be cooled in the furnace wall, reducing the temperature of the hot gas outlet. At the same time, the furnace wall absorbs the heat of the hot gas, increasing the heat insulation effect of the furnace wall and reducing the heat loss of the furnace body.

[0007] Specifically, the diameter and number of exhaust holes should be determined according to the size of the furnace volume, preferably with an exhaust hole diameter between 20 and 50 mm and a number of 4 to 12.

[0008] Specifically, a small fan is installed outside the furnace body. The fan's air inlet is connected to the main duct, and the fan's air outlet can be connected to a waste gas purification device.

[0009] Specifically, an air volume controller is installed between the main duct and the fan to precisely adjust and control the fan's air extraction volume.

[0010] Specifically, multiple heating elements are installed evenly spaced on the top surface of the furnace body, with the lower heating end located inside the furnace chamber and the upper cold end and wiring terminals located outside the furnace body.

[0011] Due to the adoption of the above technical solution, this utility model has the following beneficial effects:

[0012] 1. The exhaust-type bottom-opening electric furnace structure of this utility model has exhaust holes and exhaust pipes at the bottom of the furnace. Under the suction force of an external fan, the volatiles inside the furnace are collected in the main pipe through the exhaust holes and then discharged into the waste gas purification device through the fan outlet. This utility model has a simple and compact structure, which can not only discharge the volatiles inside the furnace in a timely manner, avoiding corrosion of the furnace lining and heating elements by the volatiles and extending the service life of the electric furnace, but also can discharge the volatiles into the waste gas treatment device in an organized manner, avoiding pollution of the atmospheric environment by the volatiles, and has a good environmental protection effect.

[0013] 2. The exhaust-type bottom-opening electric furnace structure described in this utility model has exhaust holes arranged from bottom to top inside the furnace wall, which allows the heat of the extracted volatiles to be cooled in the furnace wall, reducing the temperature of the volatiles reaching the metal pipe opening. At the same time, the furnace wall absorbs the heat of the volatiles, increasing the heat insulation effect of the furnace wall and reducing the heat loss of the furnace body.

[0014] 3. The exhaust-type bottom-opening electric furnace structure described in this utility model typically has an uneven furnace temperature, with higher temperatures at the top and lower temperatures at the bottom. By installing heating elements at the top of the furnace body, cold air from outside the furnace can enter the furnace through the gap between the heating elements and the furnace top bricks. This not only reduces the temperature of the cold end and terminals of the heating elements but also prevents the deposition of volatiles at the cold end of the heating elements, extending the service life of the heating elements. It also appropriately reduces the temperature at the top of the furnace, thus reducing the temperature difference between the top and bottom of the furnace and improving the uniformity of the furnace temperature, resulting in more even heating of the calcined material. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of the furnace door in the open state of this utility model.

[0016] Figure 2 This is a structural schematic diagram of the furnace door in the closed state of this utility model.

[0017] In the diagram: 1. Furnace door lifting mechanism; 2. Furnace shell; 3. Heat insulation bricks; 4. Furnace lining bricks; 5. Heating element; 6. Furnace chamber; 7. Calcined material; 8. Exhaust vent; 9. Main pipe; 10. Air volume controller; 11. Fan; 12. Fan outlet. Detailed Implementation

[0018] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0019] Combined with appendix Figure 1 The described exhaust-type bottom-opening electric furnace structure includes a furnace body, a furnace door, and a furnace door lifting mechanism 1. The furnace door is sealed to the lower opening of the furnace body via the furnace door lifting mechanism 1. The furnace body includes a furnace shell 2, heat-insulating bricks 3, furnace lining bricks 4, and heating elements 5 arranged sequentially from the outside to the inside, thus forming the furnace chamber 6. In normal use, the furnace door lifting mechanism 1 is first lowered to the open position, such as... Figure 1 As shown, the calcined material 7 is placed on the furnace door, and then the furnace door lifting mechanism 1 is raised to the closed state, as shown. Figure 2 As shown, a closed furnace chamber 6 is formed; multiple heating elements 5 are installed evenly spaced on the top surface of the furnace body, with the lower heating end located inside the furnace chamber 6 and the upper cold end and wiring terminals located outside the furnace body.

[0020] Several round exhaust holes 8 are evenly arranged around the furnace lining bricks 4 at the bottom of the furnace chamber 6. The diameter and number of exhaust holes 8 should be determined according to the volume of the furnace chamber 6. Preferably, the diameter of the exhaust holes 8 is between 20 and 50 mm. The number of exhaust holes 8 is 4 to 12. The exhaust holes 8 extend vertically downward from the bottom surface of the furnace chamber 6 into the lower heat-insulating bricks 3, then horizontally into the heat-insulating bricks 3 on the side wall of the furnace body, and continue to extend vertically upward to the upper part of the furnace body. From the upper part of the furnace body, they are connected to the main pipe 9 through a metal pipe. The exhaust holes 8 pass through the furnace wall, which allows the heat of the extracted volatiles to be cooled in the furnace wall, reducing the temperature of the volatiles outlet. At the same time, the furnace wall absorbs the heat of the volatiles, increasing the heat insulation effect of the furnace wall and reducing the heat loss of the furnace body. A small fan 11 is installed outside the furnace body. The air inlet of the fan 11 is connected to the main pipe 9, and the air outlet 12 of the fan 11 can... An external exhaust gas purification device is installed between the main pipe 9 and the fan 11. An air volume controller 10 is used to precisely adjust and control the air extraction volume of the fan 11. The exhaust gas purification device is existing technology. The adjustment and control of the air extraction volume of the fan 11 are both controlled by an external controller. Since the furnace body size is different, the air volume adjustment is preset in the controller according to the actual working conditions. The controller's control of the start and stop of the fan 11 and the setting of the air volume of the air volume controller 10 are existing technologies, so they will not be described in detail. The exhaust gas purification device is an external device and is not related to the structure of the furnace body. It is only used to purify the volatiles extracted from the furnace body to achieve qualified emissions, which is beneficial to environmental protection. During use, although the high-temperature volatiles extracted from the furnace by the fan 11 will take away some heat, the heat loss is negligible due to the "slight negative pressure" of the furnace and the adjustment and control of the fan air volume, so that the calcination is not affected. Example

[0021] A laboratory requires a small, bottom-opening, exhaust-type electric furnace with furnace chamber dimensions of 400mm (length), 300mm (width), and 250mm (height). The furnace utilizes the exhaust-type, bottom-opening structure described in this invention. Four exhaust ports (8) are located on the four sides of the furnace chamber bottom, each with a diameter of 20mm. The exhaust ports (8) extend vertically downwards from the bottom of the furnace chamber (6) into the heat-insulating bricks (3), then upwards into the side wall of the furnace body, and finally connect to the main pipeline (9) via a metal pipe. The volatile gases emitted from each exhaust port (8) are collected in the main pipeline (9) and then discharged through the fan (11) and fan outlet (12) into a waste gas purification device for further treatment. Example

[0022] A company needs a medium-sized bottom-opening, exhaust-type electric furnace with a furnace chamber dimension of 2000mm in length, 800mm in width, and 800mm in height. This furnace adopts the exhaust-type bottom-opening structure described in this invention. It has six exhaust vents 8, evenly distributed around the bottom of the furnace chamber, with a diameter of 30mm. The exhaust vents 8 extend vertically downwards from the bottom of the furnace chamber 6 into the heat-insulating bricks 3, then upwards into the side wall of the furnace body to the upper part of the furnace body, and finally connect to the main pipe 9 via a metal pipe from the upper part of the furnace body. The volatile gases discharged from each exhaust vent 8 are collected in the main pipe 9 and then discharged into a waste gas purification device via a fan 11 and fan outlet 12 for purification treatment. Example

[0023] A company needs a large, bottom-opening, exhaust-type electric furnace with furnace chamber dimensions of 6000mm (length), 1000mm (width), and 1000mm (height). This furnace adopts the exhaust-type, bottom-opening structure described in this invention. It has 12 exhaust vents 8, each 50mm in diameter, evenly distributed around the bottom of the furnace chamber. The exhaust vents 8 extend vertically downwards from the bottom of the furnace chamber 6 into the heat-insulating bricks 3, then upwards into the side wall of the furnace body, and finally connect to the main pipe 9 via a metal pipe. The volatile gases emitted from each exhaust vent 8 are collected in the main pipe 9 and then discharged through the fan 11 and fan outlet 12 into a waste gas purification device for further treatment. Example

[0024] A company needs a large, bottom-opening, exhaust-type electric furnace with furnace chamber dimensions of 8000mm (length), 600mm (width), and 600mm (height). This furnace adopts the exhaust-type, bottom-opening structure described in this invention. It has 10 exhaust vents 8, each with a diameter of 40mm, evenly distributed on the four sides of the furnace bottom. The exhaust vents 8 extend vertically downwards from the bottom of the furnace chamber 6 into the heat-insulating bricks 3, then upwards into the side wall of the furnace body to the upper part of the furnace body, and finally connect to the main pipe 9 via a metal pipe from the upper part of the furnace body. The volatile gases discharged from each exhaust vent 8 are collected in the main pipe 9 and then discharged into a waste gas purification device via a fan 11 and fan outlet 12 for purification treatment.

[0025] The parts of this utility model not described in detail are existing technologies.

[0026] The embodiments selected herein for the purpose of disclosing the inventive objectives of this utility model are currently considered appropriate; however, it should be understood that this utility model is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and utility model.

Claims

1. A bottom-opening, exhaust-type electric furnace structure, comprising a furnace body, a furnace door, and a furnace door lifting mechanism, wherein the furnace door is sealed to the lower opening of the furnace body via the furnace door lifting mechanism; characterized in that: The furnace body includes a furnace shell, heat insulation bricks, furnace lining bricks, and heating elements arranged sequentially from the outside to the inside. Several round vent holes are evenly arranged around the furnace lining bricks at the bottom of the furnace chamber. The vent holes extend vertically downward from the bottom surface of the furnace chamber into the heat insulation bricks at the bottom, then horizontally into the heat insulation bricks on the side wall of the furnace body, and then continue to extend vertically upward to the upper part of the furnace body. From the upper part of the furnace body, they are connected to the main pipeline through a metal pipe.

2. The exhaust-type bottom-opening electric furnace structure according to claim 1, characterized in that: The diameter and number of exhaust holes should be determined according to the size of the furnace. The diameter of the exhaust holes should be between 20 and 50 mm, and the number of exhaust holes should be between 4 and 12.

3. The exhaust-type bottom-opening electric furnace structure according to claim 1, characterized in that: in A fan is installed outside the furnace body. The fan inlet is connected to the main pipeline, and the fan outlet can be connected to an exhaust gas purification device.

4. The exhaust-type bottom-opening electric furnace structure according to claim 3, characterized in that: Install an air volume controller between the main duct and the fan.

5. The exhaust-type bottom-opening electric furnace structure according to claim 1, characterized in that: Multiple heating elements are installed evenly spaced on the top surface of the furnace body, with the lower heating end located inside the furnace chamber and the upper cold end and wiring terminals located outside the furnace body.

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