Modeling the Performance Characteristics of Diesel Engine Based Combined-Cycle Power Plants—Part II: Results and Applications

Abstract

In this two-part series publication a mathematical model of the energy conversion process in a diesel engine based combined-cycle power plant has been developed and verified. The examined configuration consists of a turbocharged diesel engine (the topping cycle), a heat recovery steam generator (HRSG) and a steam turbine plant (the bottoming cycle). The model is then used to provide an analysis of performance characteristics of the combined-cycle power plant for steady-state operation. Numerous practical performance parameters of interest have been generated, such as the mean indicated pressure, specific fuel consumption, hourly fuel consumption, brake horsepower of diesel engine, mass flow rate, pressure, and temperature of gases and air, respectively, through the gas turbine and compressor (in the frame of a turbocharger), temperature of flue gases at boiler inlet and outlet, mass flow rate of exhaust gases through the convection coils, and mass flow rate, temperature, pressure, and enthalpy of superheated steam. The performance maps have been derived. The effect of change in the major operating variables (mutual operation of diesel engine, HRSG, and steam turbine) has been analyzed over a range of operating conditions, including the engine load and speed. The model is used as a desktop design tool for accurate predictions of cycle performance, as well as insight into design trends.

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

“…It is known that around two-thirds of the thermal energy is released into the atmosphere as waste heat, i.e., by coolant, lubricating oil, and exhaust gas [350,351], and almost 40% of the heat energy is lost through exhaust gas [424]. Several techniques have been adopted for further benefits of thermal and energy management in terms of thermal efficiencies, such as exhaust heat recovery (e.g., organic Rankine cycle and thermoelectric generator) and adiabatic IC engines.…”

A comparison of advanced heat recovery power cycles in a combined cycle for large ships

“…by MAN Diesel & Turbo [2], modelling efforts for the design and optimisation are not. However, one well described example is Danov and Gupta [6,7], who presented a comprehensive mathematical model of a marine turbocharged diesel engine and a single pressure level steam Rankine WHR system including the associated auxiliary components. Validation of the model was presented at varied engine loads and speeds and the resulting fuel consumption was analysed.…”

Exergy, Economic and Environmental Analysis for Simple and Combined Heat and Power IC Engines

“…Danov and Gupta [5] developed a model to investigate a cycle consisting of a turbocharged diesel engine (the topping cycle), a heat recovery steam generator (HRSG) and a steam turbine plant (the bottoming cycle). This model can predict cycle performance for various conditions.…”