Prospects of Application and the Possibilities of Electric Modular-Launch Furnaces with a New Design of Heating System
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Vol. 61, No. 2, July, 2020
HEAT ENGINEERING PROSPECTS OF APPLICATION AND THE POSSIBILITIES OF ELECTRIC MODULAR-LAUNCH FURNACES WITH A NEW DESIGN OF HEATING SYSTEM A. I. Nizhegorodov1,2 Translated from Novye Ogneupory, No. 3, pp. 14 – 19, March, 2020.
Original article submitted November 26, 2019. We perform the analysis of the methods aimed at improving the energy efficiency of the electric modular-launch furnaces for firing of vermiculite. The first method is reduced to the analysis of the energy efficiency of the original six-module furnace with heat emitters made of U-shaped nichrome and structural transformation of the furnace unit with reinstallation of the least efficient bottom module in parallel with the most efficient top module. In this way, we get a furnace with series-and-parallel pairing of modules (SPP-furnace). The second method proposed in the previous works of the author is based on the application of new heating systems with top arrangement of wire emitters with round cross sections mounted on the thermal covers made of ceramic-vermiculite plates. Both these methods are implemented in modified SPP furnaces and give a synergistic effect with lowering of the specific energy intensity of firing of the vermiculite concentrates down to 105.9 mJ/m3 in a six-module SPP furnace and to 63.5 mJ/m3 in a four-module furnace with the use of a “zero” nonelectrified module. Keywords: electric modular-launch furnace, six-module furnace, suspended heating system, heat-energy emitters, specific energy of firing.
on special suspensions under thermal covers made of ceramic-vermiculite plates characterized by high strength and low thermal conductivity [3]. As shown in what follows, the electric modular-launch furnaces with series-and-parallel pairing of modules (SPP-furnaces) are much more efficient than the furnaces used earlier with heating systems formed by the modules of elongated U-shaped electric emitters made of strip nichrome and mounted on the refractory base of the furnace modules [4]. The aim of the present work is to increase the energy efficiency of electric modular-launch furnaces on the basis of the synergistic effect as a result of introduction of a new heating system in the design of the unit and structural changes caused by the modification of pairing of the electric modules and optimization of their number.
INTRODUCTION Firing of loose materials is a widespread technology of processing used to get materials with beneficial target properties. Thus, in the course of high-temperature treatment, e.g., in an electric modular-launch furnace, particles of vermiculite concentrate change their shapes from initially plane grains into volume grains with three-dimensional slit-like structure for several seconds [1]. After this transformation, vermiculite turns into an excellent heat-insulating material but remains incombustible and chemically and biologically inert. However, this technology is quite energy-consuming and, therefore, the process of improvement of these and other types of electric furnaces aime
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