Modeling of the process of heating of chip‑powder dispersions of ferrous metals in the pass‑through muffle furnace of hot briquetting. Message 1

Abstract

The description of the device and principle of operation of the continuous muffle furnace for hot briquetting of chip‑powder dispersions of ferrous metals is given. A distinctive feature of this device is the presence of two systems of gas‑flame and induction heating, as a result of which the achievement of the specified charge heating temperature is guaranteed with the complete removal of the liquid phase. The oil component of the coolant is used to create a protective hydrocarbon atmosphere that provides non‑oxidizing heating of the metal, as well as to obtain a carbon coating, which, in addition to protective functions, acts as a lubricant in the hot briquetting process. Subsequent combustion of oil vapors in the furnace leads to significant savings in natural gas. A furnace built according to this principle has the smallest dimensions and the highest technical and economic characteristics.The simulation of the chip heating process in the zone of loading into the furnace is carried out. The dependences of the temperature of the chips at the outlet of the screw feeder on the temperature of the flue gases at the inlet for the mass fraction of coolant in the chips of 10 % and various fractions of oil are obtained. It has been established that during the heating of the chips in the loading zone, phase transformations of the coolant do not occur, the charge heating temperature does not exceed 100 °C.