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Design Possibilities and Performance of Combined Cycle Operation of Converted Steam Power Plants

M. J. J. Linnemeijer, Jos P. van Buijtenen

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Abstract

An interesting method for “boosting thermal efficiency and/or power output of an existing steam power plant is repowering through the addition of gas turbines. The forced draught fan is replaced by a gas turbine and the air heater by low-temperature economisers. This conversion will change the performance of the installation significantly. Therefore the design of the existing installation has to be reviewed based on new unit performance calculations. Since the conversion has to be economical, it is important to find a good compromise between investment and improvement of performance. This paper describes the change in performance of the installation created by the conversion in general and a number of design possibilities based on the experience gained with the realisation of a number of conversion projects. These projects show a possible efficiency increase of over 10% and a power increase of up to 30%.

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What this paper is about

An interesting method for “boosting thermal efficiency and/or power output of an existing steam power plant is repowering through the addition of gas turbines. The forced draught fan is replaced by a gas turbine and the air heater by low-temperature economisers. This conversion will change the performance of the installation significantly. Therefore the design of the existing installation has to be reviewed based on new unit performance calculations. Since the conversion has to be economical, it is important to find a good compromise between investment and improvement of performance. This paper describes the change in performance of the installation created by the conversion in general and a number of design possibilities based on the experience gained with the realisation of a number of conversion projects. These projects show a possible efficiency increase of over 10% and a power increase of up to 30%.

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Available abstract

An interesting method for “boosting thermal efficiency and/or power output of an existing steam power plant is repowering through the addition of gas turbines. The forced draught fan is replaced by a gas turbine and the air heater by low-temperature economisers. This conversion will change the performance of the installation significantly. Therefore the design of the existing installation has to be reviewed based on new unit performance calculations. Since the conversion has to be economical, it is important to find a good compromise between investment and improvement of performance. This paper describes the change in performance of the installation created by the conversion in general and a number of design possibilities based on the experience gained with the realisation of a number of conversion projects. These projects show a possible efficiency increase of over 10% and a power increase of up to 30%.

Key concepts: Combined cycle, Gas turbines, Realisation, Thermal power station, Boosting (machine learning), Engineering, Electricity generation, Steam turbine

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