Heat treatment furnace is a metal workpiece for a variety of metal heating process industrial furnace collectively. The temperature is generally lower than the furnace. Heat treatment furnace can be used in a variety of furnace furnace, but the temperature of the furnace and the furnace more stringent. Most of the heat treatment furnace gas fuel heating, in order to accurately control the furnace temperature, and some heat treatment furnace with electric heating.
Heat treatment furnace often use a lot of furnace. Heat treatment furnace application temperature is low, the operating conditions are generally good with heat insulation refractory bricks or clay refractory brick masonry individual parts with high alumina refractory bricks, cordierite brick, silicon carbide brick and corundum brick can also be used for non-structured refractory material lining.
Heat treatment furnace is composed of furnace wall, roof and bottom three parts. Generally with refractory bricks, refractory castables and refractory fiber cotton and other materials as lining, due to furnace type, refractory varieties and heat treatment process conditions of its different service life is not the same.
1, refractory brick furnace body. The use of insulation refractory bricks and refractory masonry lining for a variety of heat treatment furnace. The thickness of the furnace wall is generally about 460 mm. Insulation layer thickness of 70 ~ 230mm with a bulk density of 0.8g / cm3 diatomaceous earth refractory bricks, clay or high-alumina insulation brick, floating beads or calcium silicate insulation board masonry. Working layer thickness of 230 ~ 348mm. Chain furnace and muffle furnace and other high-temperature annealing furnace working layer with clay refractory masonry continuous horizontal furnace, tower furnace and hood furnace furnace working layer available bulk density of 0.8 ~ 1.0g / cm3 clay Or high-aluminum insulation brick and floating beads brick masonry roll furnace on the upper side of the masonry roll with a roll of brick to facilitate the replacement of the furnace roll, tower furnace and pit furnace furnace wall to prevent all Pour out every 2m high parts should be installed metal joists or tiles and connected with the furnace shell. The holes in the furnace wall are surrounded by clay refractory masonry. The use of non-hood or muffle of the bright treatment of vertical furnace and tower furnace and other equipment when dealing with stainless steel and other senior metal materials need to pass high purity dry hydrogen or nitrogen and hydrogen and other protective gases so the furnace must be high purity Refractory material that is the lower part of the furnace wall and some special-shaped plate and the tube should be sintered or fused corundum material to build the remaining furnace wall with alumina hollow ball insulation brick masonry mud must also be used with the masonry. Such materials in the heating process does not precipitate any harmful gases and can resist the destruction of hydrogen so the furnace application life is longer.
The roof is divided into hanging flat top, fixed or removable vault and so on. The top of the furnace is a mobile roof. The thickness of the working and insulation layers of the furnace tops are 230 mm and 70 to 230 mm, respectively, and the refractory material is basically the same as that of the furnace wall.
Heat treatment furnace bottom in addition to the chain furnace and some muffle are load-bearing. The thickness of the working and insulation layers is generally 230 mm and 70 to 230 mm, respectively. The former with clay refractory masonry the latter with clay or high-alumina insulation brick, floating beads or diatomite brick masonry use. Heat treatment furnace brick furnace in the proper operating conditions for the service life of 3 years to reach more than 4 years. During this period vulnerable parts of the lining to go through several minor repairs.
2, refractory castable furnace. Pouring with a refractory castable or working with a prefabricated block of a heat treatment furnace. Indoor furnace and car furnace furnace furnace with high alumina cement refractory castable prefabricated block hanging not only construction speed and furnace cooling less service life of 3 years when the use of anchoring tiles and hanging brick, and with high aluminum Cement and clay refractory castable or high-strength light refractory castable on-site watering when the furnace body is good, less heat, thermal shock resistance and therefore its application life is generally 2 years.
3, refractory fiber furnace. With the fire-resistant fiber blanket, felt, plate, brick and its combination of pieces and other products paving heat treatment furnace furnace or paste its working layer can save fuel economic effect is more significant but the application life to be improved.
Paste method is to use high temperature adhesive to the fiber strip on the surface of the original lining work layer can be directly contact with the flames. First, the surface of the lining completely clean the brushing high-temperature adhesive and then fire-resistant fiber felt blanket cut into small strips attached to the surface and pressed its thickness is generally 30 ~ 60mm.