Ladle furnace on-line reckoner for prediction and control of steel temperature and composition

Abstract

In the present day competitive market scenario, steel producers are striving for high speed continuous casting with stringent and consistent quality as well as reduced production cost. The ladle furnace (LF) is a key unit for achieving the above objectives during secondary steelmaking. Proper control of process parameters during LF processing of liquid steel is essential. The paper reports development of a model based advisory system, called ladle furnace on-line reckoner (LFOR), for the prediction and control of temperature and composition of steel in a LF. The thermal and chemistry models employed in the LFOR system are based on simplified physics, material and heat balance, and statistical analysis of plant data. The LFOR system is provided with graphical user interface (GUI) to display the predicted composition and temperature profile. The control advice displayed on the screen provides guidance for arcing and addition to achieve the target temperature and composition. The LFOR system has been commissioned at LF No. 2 of the LD2 and Slab Caster Shop of Tata Steel, Jamshedpur and is designed to meet the requirements of sequence casting as well as to optimise the energy input and cost of alloying additions. The performance of the LFOR system was analysed and validated with data taken over 100 heats and was noted to be satisfactory.

Thermal insulation performance analysis of nanoporous thermal insulating materials applied in torpedo ladle

“…The temperature drop brings a lot of negative effects, such as the increase in energy consumption, the decrease in the metal recovery rate and even the solidification of molten iron. 2 These negative effects disturb the normal operation of the steelmaking process. The reduction of the temperature drop of molten iron can improve production efficiency and cut off production cost.…”

Solution Space Exploration to Design Ladle Refining Operation for Desired Downstream Requirements Using Operability Framework

“…Several factors influence the heat losses that occur during refining. In order to maintain the desired temperature in ladle, arcing is required which is an energy intensive operation . These considerations establish the need for devising a good purging and arcing strategy to achieve the desired inclusion removal efficiency and superheat without adversely affecting the cost of refining.…”

Optimal Design and Experimental Study of Ejector for Ladle Baking

“…The regenerative ladle preheater has been widely used to reduce the energy consumption in the ladle baking process . The enclosed baking mode with two nozzles is applied for the ladle baking process.…”