Abstract
A ceramic gas turbine can save energy because of its high thermal efficiency at high turbine inlet temperatures. This paper deals with the thermodynamic and economic aspects of a ceramic gas turbine cogeneration system. Here cogeneration means the simultaneous production of electrical en-ergy and useful thermal energy from the same facility. The thermodynamic performance of a ceramic gas turbine cycle is assessed using a computer model. This model is used in parametric studies of performance under partial loads and at various inlet air temperatures. The computed performance is compared to the measured performance of a conventional gas turbine cycle. Then, an economic evaluation of a ceramic gas turbine cogeneration system is investigated. Energy savings provided by this system are estimated on the basis of the distributions of heat/power ratios. The computed economic evaluation is compared to the actual economic performance of a conventional system in which boilers produce the required thermal energy and electricity is purchased from a utility.
Highlights
Adaptations of aircraft engines for industrial, utility, and marine-propulsion applications have long been accepted as means for generating power with high efficiency and for ease of maintenance
The computed economic evaluation is compared to the actual economic performance of a conventional system in which boilers produce the required thermal energy and electricity is purchased from a utility
This results from internal irreversibilities caused by imperfections in the conversion process; it measures the degradation of energy entering the process whose exergy content is close to unity
Summary
Adaptations of aircraft engines for industrial, utility, and marine-propulsion applications have long been accepted as means for generating power with high efficiency and for ease of maintenance. Because of their heritage, aeroderivative gas turbines typically require less space and supporting structure than other industrial gas turbines of equivalent output power. The resultant system achieves approximately 75% utilization of input thermal energy compared to approximately 35% for a fossil-fuel-fired steam plant designed to provide only power. This significant energy savings is a primary factor contributing to favorable economics for many gas-turbine-based cogeneration systems. This paper briefly describes the system under consideration, and summarizes computational results from parametric studies
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