A Comparative Study of Integrated Coal Gasification Combined- Cycle Power Plants (ICGCC) with Kalina Cycle

Document Type : Original Article

Authors

1 Mechanical Power Engineering Dept., Faculty of Engineering, Port Said University, Portsaid, Egypt

2 Mechanical Power Engineering Dept., Faculty of Engineering, Port Said University, Port Said, Egypt

3 Mechanical Power Engineering Department, Faculty of Engineering, Port Said University, Port said, Egypt.

Abstract

Low grade waste heat utilization and new combustion technology are challenging tasks for researchers to achieve these objectives. This paper is concerned with the integration of coal gasification system with a combined gas turbine, steam turbine power plant cycles and with ammonia-water cycle, which is known as Kalina cycle. Al-maghara coal in North Sinai is used as the solid fuel in gasification process.Three cycles configurationsare compared as follows: Scheme (A) with dual pressure Heat recovery boiler with the condenser of steam cycle as the evaporator for Kalina cycle,scheme (B) with heat recovery boiler for both of steam and Kalina cycleand scheme (C), similar to scheme (A), but with a superheating in Kalina cycleto identify the most promising one for implementation. Key parameters of Kalina cycle were the main elements of comparison. Results revealed that scheme (A) has the best performance with regard to the output power, thermal efficiency and specific fuel consumption. Substantially, the integration of Kalina cycle with coal gasification combined cycle counterbalances the reduction of the overall efficiency due to the gasification thermal efficiency. Therefore, integration of Kalina cycle in the ICGCC is justified.Furthermore, part load calculations were made for scheme (A) and identified that the integration of Kalina cycle to ICGCC imposed restrictions to Kalina cycle constrains, so that it is more economical to keep such configuration of combined plants at nearly full load conditions.

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