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RESEARCH PAPERS: Gas Turbines: Industrial and Cogeneration

Energy Recovery of Blast-Furnace Gas Coke: The Importance of a Correct Regulation System

[+] Author and Article Information
D. Laforgia, F. Ruggiero

Istituto di Macchine ed Energetica, Polytechnic of Bari, Italy

J. Eng. Gas Turbines Power 118(3), 610-619 (Jul 01, 1996) (10 pages) doi:10.1115/1.2816692 History: Received July 27, 1994; Online November 19, 2007

Abstract

The present work deals with the regulation system of a plant recovering the energy of blast-furnace gas coke residual pressure. Such a plant is equipped with a turbogenerator, which produces electric energy, expanding the gas coke up to the mill pipe network pressure value. Before revamping, the regulation system consisted of an automatic nozzle control of a turbine stator and a throttle valve. Once the system became operative, the regulation system seemed to be inadequate because it caused a significant reduction in energy recovery due to the variation of the gas coke characteristics, compared to the original engineering specifications. A mathematical model for the plant simulation has been developed through the regulation system static and dynamic responses. This simulation, together with a series of experimental tests, identified the causes of the operational problems in the original regulation system. On the basis of the response times of the old regulation system, a value with reduced intervention inertia has been suggested. The regulation logic was also modified: The valve interventions were directly linked to the pressure variations recorded at the blast furnace top, and no longer to the opening variation of the turbine automatic system. A more rational use of the plant components and its control system, together with an increase of the electric energy production, have been demonstrated.

Copyright © 1996 by The American Society of Mechanical Engineers
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