Abstract
A system which can automatically obtain online plant status data and calculate an optimal operating condition refering to gasification performance evaluation functions is suggested by the authors in this paper. Optimization calculations with non-linear programming are performed in the system for operating conditions of a entrained flow coal gasifer under three gasifier's loads. Constraint of temperature inside the gasifier, calorific value of prodcut gas and amount of recycled char, are imposed on each calculation. The temperature inside the gasifier reflects taking into account a discharge of molten slag from the gasifier. Calorific value of product gas is refered to specifications of gas turbine combustor. Amount of recycled char is restricted within the capacity of recycling system of the plant. Fluctuation of air ratio is also taken into account in the optimization calculation. Results show that improvement of gasifier performance can be done in each gasifier's load, such as 0.28MJ/m^3N increase in calorific value of product gas in 100% load and 0.43 MJ/m^3N increase in 80% load, though optimal condition in 70% load cannot be found. It is confirmed that the system is effective for the assessment of the gasifier's operating condition and performance.
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