Title: Modelling and control of MIMO gasifier system during coal quality variations

Authors: X. Anitha Mary; L. Sivakumar; J. Jayakumar

Addresses: Department of Electronics and Instrumentation Engineering, Karunya University, Coimbatore – 641 014, India ' Sri Krishna College of Engineering and Technology, Coimbatore – 641 008, India ' Department of Electronics and Electrical Engineering, Karunya University, Coimbatore – 641 014, India

Abstract: Coal gasifier converts coal into synthesis gas (syngas). The quality of syngas is highly influenced by variation in coal quality (calorific value of syngas) thereby affecting power generation capabilities of integrated gasification combined cycle (IGCC) plants. The mathematical model for a coal gasifier is found to be complex because of its nonlinearity and multivariable in nature. The higher order state space time domain model of coal gasifier given in ALSTOM benchmark challenge II has been taken as a reference plant in this work. This higher order model has been transformed into second order S-domain models. PID controller with filter approach has been applied to these lower order models to study the gasifier dynamics during the coal quality variations in either direction with respect to the design value. The obtained results are quite promising.

Keywords: coal gasifiers; MIMO systems; simulation; lower order reduction; gasifier performance; gasifier control; PIDF control; coal quality; quality variation; synthesis gas; syngas; calorific value; power generation; integrated gasification combined cycle; IGCC plants; mathematical modelling.

DOI: 10.1504/IJMIC.2015.068870

International Journal of Modelling, Identification and Control, 2015 Vol.23 No.2, pp.131 - 139

Received: 28 Apr 2014
Accepted: 21 Aug 2014
Published online: 16 Apr 2015 *

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