By R. V. Williams
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Extra resources for Control and Analysis in Iron and Steelmaking
4. 5. T h e whole central 'package' of the Inputs. Outputs. Measurements. Process models. Control actions. Inputs are the burden quantities and analyses, the blast temperature, volume and humidity, and the amount of oil coal or other injectants at the tuyeres. T h e outputs are essentially the hot metal analysis, temperature and quantity, with an emphasis on silicon levels in the hot metal. Measurements comprise: a. Charge weights sinter, rubble ore, carbonates, additives, scrap, coke, and also charges per hour b.
T h e others, though important, are more in the province of computer software. It must clearly be stated that off-line 'policy' models are much more widely used than 'control' models. In fact, it is almost mandatory for a large blast furnace to have a set of policy model programs associated with it. O n e such, very successful, set of programs, developed and widely used by the British Steel Corporation, will be described in some detail below. This will be followed by a discussion of 'control' models developed in recent years.
In this technique the parameter measured is not water content but hydrogen atom content. In many applications this is the same as water content but the difference must be considered in all applications of this method. In the sinter plant there can be a small proportion of the material containing hydrocarbons which have not yet been evaporated or burnt up but this, in practice, is not a serious problem. 12 shows the different 5 types of geometry used in moisture determination by neutron moderation .
Control and Analysis in Iron and Steelmaking by R. V. Williams