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The carbon calcining furnace is a high-pressure molded carbon material product. Under the condition of isolating air, the carbon roasting furnace is indirectly heated at a specified temperature to improve the strength, conductivity, and high-temperature resistance of carbon products.
Carbon calcining furnaces are divided into continuous multi-chamber, closed, and open types. Since the high temperatures in various parts of the calciner are different, the refractory materials used for the refractory bricks in the calciner are also different. Such as brick piers at the bottom of closed roasting furnaces, pit bricks that bear the weight of the upper masonry and baked products, fire shafts with temperatures above 1400°C, etc. Therefore, the masonry is mostly made of clay bricks with high mechanical strength and good thermal stability. The lid of the closed roasting furnace needs to be moved during the production process, so it is built with lightweight refractory bricks.
The main structure of the carbon calcining furnace includes the furnace bottom, side walls, fire channels, and connected fire channels. The furnace bottom is made of lightweight refractory bricks, the material box is made of special clay bricks, the side walls are made of lightweight refractory bricks, and the fire passages and connecting passages are made of special fire passage wall bricks.
Carbon calcining furnaces are generally divided into two types: rotary type and steamer. Carbon calcining furnaces are thermal equipment that use separated air as raw material for heat treatment. The refractory materials used in charcoal furnaces are mainly high alumina bricks, clay bricks, and refractory castables.
The steam pot calcining furnace makes full use of the volatile substances that escape during the destruction process of carbon materials, supplements part of the furnace gas, and then mixes it with the air preheated through the heat exchange chamber, and burns in the fire channel to indirectly heat the carbon materials. A kind of furnace. The fire channel temperature during the roasting process is 1300~1380℃, and the burner temperature reaches 1500℃.
The masonry of calcining tanks and fire channels generally uses silica bricks with good thermal conductivity, high loading softening point, and high-temperature mechanical strength. The bottom of the heat exchange chamber is equipped with checker bricks. Due to the high temperature, it can withstand a large load and perform heat exchange at the same time. Therefore, in the past, clay bricks with good thermal stability and high-weight softening points were generally used, and high-alumina bricks were used for the combustion port. The main function of the welding rod roasting furnace is to indirectly heat the carbon electrodes, carbon blocks, chemical resistors, etc. in closed air conditions. Commonly used in multi-chamber baking. Since the bottom of the baking furnace bears the load of the upper blocks and refractory bricks, the upper electrode box heating wall, the fire well box, the combustion port, and other blocks can also withstand high-temperature effects of about 1400°C and the effects of temperature changes, so relatively high-temperature resistance should be used. Great mechanical strength, built with clay bricks with high softening temperature and good thermal stability.
Selection of lightweight insulation bricks for carbon roasting furnace construction
Since each part of the carbon roasting furnace is subjected to different high temperatures, the selected refractory materials are also different. For example, the brick pier at the bottom of the closed roasting furnace, the pit bricks bear the weight of the upper masonry and the roasted products, and the fire well is exposed to temperatures above 1400°C. Due to the high-temperature effect, etc., clay bricks with high mechanical strength and good thermal stability are often used for construction; the closed roasting furnace cover needs to be moved during the production process, so lightweight insulation bricks are often used for construction.
Overview of charcoal burning furnace and selection of refractory bricks
A charcoal-burning stove is a thermal processing equipment that isolates charcoal materials from the air. The function of heating is to cause the water and volatile matter in the carbon material to escape, and to produce changes such as volume shrinkage and true density increase, thereby obtaining better electrical and thermal conductivity, as well as resistance to oxidation and corrosion. Carbon calcining usually uses a steam pot-type calcining furnace, which consists of many vertical small forging pots, each group of 4 is divided into several groups. The steam pot calcining furnace is a furnace that makes full use of the volatile gases that escape from carbonaceous materials during the calcining process and adds a portion of the furnace gas into the fire channel to burn through the fire channel and indirectly heat the carbon materials. The flame temperature can reach 1300~1380℃. The firing temperature is as high as 1500℃, so the firing furnace and furnace must withstand high temperatures above 1300℃. They are also affected by the friction and impact of carbon materials on the tank wall, the erosion and seepage of gases during combustion, and low melting point salt slag. The erosion effect. Based on the above reasons, silica bricks with good thermal conductivity, high loading temperature, and good high-temperature mechanical strength are generally used for the calcining tank and fire channel. When the burner temperature is high, high alumina bricks are used, the remaining furnace bottom blocks are made of red bricks, light weight bricks, and bonded refractory bricks, and the furnace wall parts are made of red bricks, clay refractory bricks, and lightweight refractory bricks.
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