Modeling and simulation of the cogeneration plant equipped with back pressure turbine operates at various control programs of exit steam temperature

Abstract EN

Cogeneration represents one of the main ways for increasing the efficiency of primary energy use.

This paper deals with a theoretical analysis of cogeneration plants equipped with various back-pressure turbines type R.

These plants are studied during their operation with conventional method (water injection) and the suggested method (sliding live steam temperature) to regulate steam temperature supplied to the industrial consumers.

A computer program had been written to work under Math Cad software to simulate cogeneration plant with each back-pressure turbine under design and off design conditions.

The performance of the different schemes is analyzed in view of the first and second laws.

In this analysis entropy method (second law) in addition to more conventional energy analysis (first law), are employed to evaluate overall and component efficiencies, fuel consumption and to identify the thermodynamic losses.

The results show that, using the suggested method leads to increase the overall efficiency of the cogeneration plant for all types of back-pressure turbine and can reduce the fuel consumption.

Finally, the results show that increasing back-pressure leads to improve the performance of cogeneration plant regardless of the method used.