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1. (WO2001032581) KILN PLANT CONTROL SYSTEM

Pub. No.:    WO/2001/032581    International Application No.:    PCT/IB2000/001577
Publication Date: Fri May 11 01:59:59 CEST 2001 International Filing Date: Thu Nov 02 00:59:59 CET 2000
IPC: C04B 7/36
F27B 7/20
F27B 7/42
Applicants: PRETORIA PORTLAND CEMENT COMPANY LIMITED
KEARNS, Michael, John
LANGE, Tony, Brian
FREWIN, Neville
Inventors: KEARNS, Michael, John
LANGE, Tony, Brian
FREWIN, Neville
Title: KILN PLANT CONTROL SYSTEM
Abstract:
A controller for a kiln plant, typically a cement plant, has a thermodynamic controller which measures a number of variables including the kiln hood temperature and one or more output gas concentrations, and controls the fuel input to the kiln to maintain the hood temperature within a desired range and a main impeller of the kiln to maintain the measured gas concentrations within a predetermined range. The invention includes a quality controller which controls the amount of C3S present in clinker produced by the plant. The controller comprises an inner controller which controls free-lime content in the clinker and a thermodynamic outer controller.