An Improved Heating System with Waste Pressure Utilization in a Combined Heat and Power Unit

Heng Chen, Jidong Xu, Yao Xiao, Zhen Qi, Gang Xu and Yongping Yang
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Heng Chen: National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China
Jidong Xu: National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China
Yao Xiao: National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China
Zhen Qi: National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China
Gang Xu: National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China
Yongping Yang: National Thermal Power Engineering and Technology Research Center, North China Electric Power University, Beijing 102206, China

Energies, 2018, vol. 11, issue 6, 1-20

Abstract: An improved heating system integrated with waste pressure utilization (WPU) for combined heat and power (CHP) cogeneration was proposed. The new heating system efficiently utilized the excess pressure of the extraction heating steam to drive the WPU turbine and generator for producing electricity, achieving higher energy efficiency and lower fuel consumption of the CHP unit. The results of the detailed thermodynamic analysis showed that applying the proposed concept in a typical 300 MW coal-fired CHP unit could reduce the standard coal consumption rate by 9.84 g/(kW·h), with a thermal efficiency improvement of 1.97% (absolute value). Compared to that of the original heating process, the energy efficiency of the proposed process decreased by 0.55% (absolute value), but its exergy efficiency increased dramatically by 17.97% (absolute value), which meant that the proposed configuration could make better use of the steam energy and contribute to the better performance of the CHP unit. As the unit generation load and supply and return-water temperatures declined and the unit heating load rose, the WPU system would generate more electricity and its energy-saving benefit would be enhanced. This work provides a promising approach to further advance the CHP technology and district heating systems.

Keywords: combine heat and power; heating system; waste pressure utilization; thermodynamic analysis; energy-saving (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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