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Entropy 2014, 16(4), 1883-1901; doi:10.3390/e16041883

District Heating Mode Analysis Based on an Air-cooled Combined Heat and Power Station

North China Electric Power University, NO.2 Beinong Road, Changping District, Beijing 102206, China
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Received: 27 December 2013 / Revised: 25 February 2014 / Accepted: 13 March 2014 / Published: 26 March 2014
(This article belongs to the Special Issue Advances in Applied Thermodynamics)
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Abstract

As an important research subject, district heating with combined heat and power (CHP) has significant potential for energy conservation. This paper utilised a 200 MW air-cooled unit as an actual case and presented a design scheme and energy consumption analysis of three typical CHP modes, including the low vacuum mode (LVM), the extraction condensing mode (ECM), and the absorbing heat pump mode (AHPM). The advantages and disadvantages of each mode (including their practical problems) were analysed, and suggestions for the best mode were proposed. The energy consumption of the three heating modes changed with the heating load. When the heating load was increased, the net power of the entire system decreased to different degrees. In this paper, the energy conservation effect of the LVM was the most ideal, followed by the ECM and the AHPM. Besides, the LVM and AHPM were able to supply larger heat loads than the ECM, which was limited by the minimum cooling flow of the low pressure cylinder. Furthermore, in order to get a more general conclusion, a similar case with an air-cooled 300 MW unit is studied, showing that the fuel consumption levels of ECM and AHPM have changed. View Full-Text
Keywords: CHP; space heating; energy saving; air-cooled power plant CHP; space heating; energy saving; air-cooled power plant
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Li, P.F.; Ge, Z.; Yang, Z.; Chen, Y.; Yang, Y. District Heating Mode Analysis Based on an Air-cooled Combined Heat and Power Station. Entropy 2014, 16, 1883-1901.

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