Combustion System of a Reheating Furnace Jul01

Combustion System of a Reheating Furnace...

Combustion System of a Reheating Furnace The main function of a reheating furnace is to raise the temperature of the semi-finished steels (billets, blooms, slabs or rounds) typically to temperatures between 1000 deg C and 1250 deg C, until it is plastic enough to be rolled to the desired section, size or shape in the hot rolling mill. The reheating furnace must also meet specific requirements and objectives in terms of the heating rates for metallurgical and productivity reasons. In the reheating furnace there is a continuous flow of material which is heated to the desired temperature as it travels through the furnace. Hot rolling operations require high quality reheated semi-finished steels at the lowest possible cost and at the optimal production rate of the rolling mill. The reheating furnaces used for heating the semi-finished steels in a hot rolling mill consume a large quantity of the energy and simultaneously generate large quantity of pollutants. Because of this, there is a necessity to look into the ways for the reduction of energy consumption as well as pollutants and hence the costs. This can be done by improving the fuel efficiency of the reheating furnaces. The combustion system of the reheating furnace has a major influence on both the quality of the reheated semi-finished steel product and on the amount of fuel needed for the reheating. The important expectations from a reheating furnace today are not only to lower the emission of the pollutants and the energy consumption, but also to have the improved high quality of the heated steel product, reliability, uniform temperature, heat flux and safety of the equipment and personnel. All these are the key factors which have considerable effect on the combustion system of the reheating furnace. The three basic things...