Title: Modelling and multi-loop selective control of industrial coal pulveriser

Authors: Vini Dadiala; Jignesh Patel; Jayesh Barve

Addresses: Department of Instrumentation and Control, Institute of Technology, Nirma University, Sarkhej – Gandhinagar Highway, Gota, Ahmedabad, Gujarat – 382481, India ' Department of Instrumentation and Control, Institute of Technology, Nirma University, Sarkhej – Gandhinagar Highway, Gota, Ahmedabad, Gujarat – 382481, India ' GE Global Research, GE India Technology Center, Whitefield Road, Bengaluru, Karnataka – 560066, India

Abstract: Coal-based power generation continues to be a key player in power generation. Pulverisation of coal is an important, but an energy intensive process. Efficient control of the pulveriser can improve the efficiency of the power plant, which otherwise lies in the range of 30-40%, a rather low value. This paper discusses various computational results and their analysis for the case study carried out at ESSAR thermal power plant, Hazira, Gujarat, India. It proposes more accurate mathematical model for a pulveriser and a 3PI (proportional integral) with selective control for improved performance. The model is validated with real plant data and is observed to capture system dynamics more effectively than the models existing in the literature. It is observed that the new model with proposed control has better load disturbance rejection properties and is more robust to parametric variations compared to the control strategy employed in the industry.

Keywords: coal pulveriser; static classifier; coal mill modelling; latent heat; sensible heat; coal moisture; parametric analysis; 3PI with selective control.

DOI: 10.1504/IJMIC.2020.112291

International Journal of Modelling, Identification and Control, 2020 Vol.34 No.4, pp.366 - 378

Received: 11 Sep 2019
Accepted: 14 Mar 2020
Published online: 07 Jan 2021 *

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