Technological and Energy Capabilities of Electric Two-Module Pouring Furnaces with Upper Heating System
- PDF / 273,248 Bytes
- 7 Pages / 594 x 792 pts Page_size
- 98 Downloads / 141 Views
Vol. 61, No. 3, September, 2020
TECHNOLOGICAL AND ENERGY CAPABILITIES OF ELECTRIC TWO-MODULE POURING FURNACES WITH UPPER HEATING SYSTEM A. I. Nizhegorodov1,2 Translated from Novye Ogneupory, No. 6, June, pp. 13 – 19, 2020
Original article submitted January 24, 2020. A new modified two-module electric modular-pouring furnace with an upper heating system of heaters and an additional “zero” (non-electrified) module is considered. By eliminating the lower third firing module, a reduction of energy consumption by a third compared to the three-module prototype furnace was achieved. Suspended emitting elements, which are not only energetically more efficient than the previous ones made of strip heaters, but also constructively provide double the furnace throughput due to the suspension under thermal covers, are used in the modules. This leads to a doubling of its performance. Altogether, it gives a decrease in the specific energy consumption of vermiculite firing in a new two-module furnace to a level of 50.4 J/m3. Keywords: two-module electric furnace, upper heating system, suspended emitting elements, furnace throughput, energy intensity.
for the transition to an alternative concept of more complex furnaces with movable hearth platforms [6], since in the zones where the foaming vermiculite was poured from one module to another, crowding of grains, which packed into 2 – 3 rows and overlapped the height of the strip heaters, generated. It led to overheating and heaters blowing due to a sharp decrease in heat removal from them in these zones. Attempts to increase the performance of modular-pouring furnaces at the expense of a greater supply of raw materials led to the failure of furnace units; therefore, their performance PV was 1.5 – 1.75 m3/h for different types and sizes of vermiculite concentrate grains. The transition from the lower heating system with strip heating elements to the upper one (suspended from wire nichrome), located not on the refractory module surface, but above it, fixed under the module thermal cover, made it possible to solve the problem of limiting the vermiculite concentrate supply to the furnace. The objective of this study was to increase the performance of modular-pouring furnaces at least 2 times in comparison with the prototype furnace due to the application of heating systems with an upper arrangement of radiant energy emitters in firing modules and organizing the vermiculite movement in a denser flow in them.
INTRODUCTION The concept of electric modular-pouring furnaces for firing vermiculite was realized in 2003; the first article [1] about it was published in 2007. The use of imperfect two-three-module furnaces at the Irkutsk enterprise Kvalitet showed that in terms of specific energy intensity (240 – 250 mJ/m3) they exceeded the fired furnaces on hydrocarbon fuel, that were used for these purposes [2]. Further improvement of this concept went through six-module furnace designs (235 mJ/m3) with series-parallel integration of modules (196 mJ/m3) [3] and, finally, a furnace appeared, th
Data Loading...
