Multilayer assembled electric furnace hearth

Abstract

The invention discloses a multilayer assembled electric furnace hearth which comprises an annular furnace wall (2), and a furnace cover (1) and a furnace bottom (2) located on the upper side and the lower side of the furnace wall (2). At least one heat expansion seam (21) and at least one exhaust hole (22) are formed in the furnace wall (2), and penetrate through the furnace wall (2) along a height direction of the furnace wall (2); and the heat expansion seam (21) extends onto the exhaust hole (22) in the direction from the inner wall of the furnace wall (2) to the outer wall. According to the electric furnace hearth, on one hand, the requirement on heat expansion of an inner circle of the furnace wall on a middle layer located at a high temperature area in the temperature rise process ofthe hearth is met, so that the heat stress is ensured to be effectively released; on the other hand, through the heat expansion seam and the exhaust hole communicating with the heat expansion seam, awaste gas in the hearth can be smoothly exhausted; and in addition, the radial heat radiation and heat conduction of the hearth can be prevented, so that an energy-saving effect of the hearth is improved.

Description

technical field [0001] The invention relates to the technical field of electric furnace manufacturing, in particular to a multi-layer assembled electric furnace hearth for experimental electric furnaces. Background technique [0002] Experimental electric furnaces are mostly used in experiments and small batch production in universities, industrial and mining enterprises. The furnace body of the experimental electric furnace includes a shell, a furnace and an insulation layer between the shell and the furnace. An electric heating element is installed in the furnace, and the electric energy is converted into heat energy through the electric heating element to heat the items in the furnace. The higher the temperature in the furnace, the higher the temperature. The thickness of the furnace wall is thicker. [0003] The hearth of the experimental electric furnace is usually obtained by integral extrusion or grouting of heavy high-temperature refractory materials and then fired ...

AI Technical Summary

Problems solved by technology

[0003] The hearth of the experimental electric furnace is usually obtained by integral extrusion or grouting of heavy high-temperature refractory materials and then fired at high temperature. The disadvantages are large thermal conductivity, large heat capacity and low yield.

At the same time, due to thermal expansion at the initial stage of use of this kind of integral furnace, especially when the heating or cooling rate is fast, the overall temperature of the furnace is uneven or the thermal stress is too large, resulting in deformation or even cracking of the furnace, reducing the service life of the furnace; while the integrity of the traditional furnace The structure makes it difficult to remove the exhaust gas when the item is heated, which has a corrosive effect on the electric heating element, thus increasing the use and maintenance costs of the electric furnace

[0004] To this end, it is necessary to solve the problem of high radial heat radiation and heat conduction in the existing electric furnace, which is not conducive to energy saving. It is necessary to reasonably design the furnace structure of the experimental electric furnace, so as to provide a method that can ensure the effective release of thermal stress and can smoothly discharge the exhaust gas in the furnace. Emission, experimental electric furnace furnace with better energy saving effect

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