Converting existing power plants to district energy supply
Conference
·
OSTI ID:390890
- Joseph Technology Corporation, Inc., Woodcliff Lake, NJ (United States)
Existing single purpose steam electric generating stations can be retrofitted to supply thermal energy for district heating and cooling systems. In modern systems, such retrofits usually involve diverting steam from the turbine cycle to specially designed heat exchangers where the steam is condensed and the temperature of the water to be supply to the district heating system is raised. Chilled water can be generated by steam driven chillers. The steam can be extracted from the cycle at existing feedwater heating extraction points, at new extraction points made in the turbine casing, or at crossovers between turbine sections. An alternative is to convert a turbine to backpressure mode by eliminating or bypassing the lowest pressure stages and exhausting the total flow to a district heating condensing heat exchanger. Retrofitting existing turbine generators stations to provide steam for distracting energy provides a means for improving the overall fuel efficiency of a station to very high values. This is possible because much of the heat which is rejected as waste in a normal single purpose plant can be sold as a useful product. The value of the heat sold by the combined heat and electric generating station is naturally much lower per unit of energy than the electricity but the economics may still be very attractive because the relatively low pressure at which steam is supplied to a district energy system allows much of the energy available for generation to be obtained before the steam is extracted from the cycle. For a retrofit to be economically attractive, the value of the steam extracted for district energy must exceed all the costs associated with providing it. These costs include replacement of any lost electric power generation, payback for the capital cost of the retrofit, operating and maintenance costs associated with the extraction and any additional fuel consumption beyond that required for generation without extraction.
- OSTI ID:
- 390890
- Report Number(s):
- CONF-960688--
- Country of Publication:
- United States
- Language:
- English
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