The structure of the bottom of the furnace is generally made of lightweight insulation material for the insulation layer, and the casting material is integrally cast as a working layer. This kind of structure has the advantages of better integrity and longer service life than traditional firebrick-based furnace bottom structures, but there are still some deficiencies.
(1) Difficulties in demolding of the furnace floor as a whole (the template of the water seal tank cannot be taken out); (2) Outer ring expansion and displacement of the furnace bottom; (3) Hot air rises and the bottom of the furnace is not bake well in the oven. A little carelessness caused the bottom of the furnace to burst.
In response to the above problems, we have made the following improvements to the structure and materials of the hearth.
(1) Fast-drying and explosion-proof castables are used in the working layer. This type of castable has a short demolding time, has quick-drying and explosion-proof functions, and is not easy to burst during the oven, and has high strength, good thermal shock resistance, and good resistance to oxidation scales. The excellent characteristics are the ideal material for the working layer of the hearth, and the unique construction process ensures that the working layer of the hearth does not expand and shift outwards.
(2) Prefabricated parts are used for the inner and outer ring edges, and the mold is not used when pouring the working layer. This not only solves the difficulty of mold release during furnace bottom construction, but also ensures the size of the annular seam between the inner and outer rings of the furnace bottom.
(3) The thickness of the working layer is reduced, and the thickness of the insulation layer is thickened to improve the insulation performance of the furnace bottom.
With the technological progress of the refractory industry, a number of high-quality and high-efficiency refractory materials have been adopted, which have improved the structure of the furnace wall, gradually reduced the thickness of the working layer, and gradually increased the thickness of the thermal insulation layer. This has the effect of improving the thermal insulation performance of the furnace wall. Benefits, but it should be noted that the particularity of the structure of the annular furnace wall, that is, the thickness of the upper furnace wall is wider than the lower furnace wall.
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