New waste heat district heating system with combined heat and power based on absorption heat exchange cycle in China

Abstract A new waste heat district heating system with combined heat and power based on absorption heat exchange cycle (DHAC) was developed to increase the heating capacity of combined heat and power (CHP) through waste heat recovery, and enhance heat transmission capacity of the existing primary side district heating network through decreasing return water temperature by new type absorption heat exchanger (AHE). The DHAC system and a conventional district heating system based on CHP (CDH) were analyzed in terms of both thermodynamics and economics. Compared to CDH, the DHAC increased heating capacity by 31% and increased heat transmission capacity of the existing primary side district heating network by 75%. The results showed that the exergetic efficiency of DHAC was 10.41% higher and the product exergy monetary cost was 36.6¥/GJ less than a CHD. DHAC is an effective way to increase thermal utilization factor of CHP, and to reduce district heating cost.

[1]  Sławomir Smoleń,et al.  Low rate energy use for heating and in industrial energy supply systems—Some technical and economical aspects , 2006 .

[2]  Jiabin Chen,et al.  Application of absorption heat transformer to recover waste heat from a synthetic rubber plant , 2003 .

[3]  Siyoung Jeong,et al.  Dynamic simulation of an absorption heat pump for recovering low grade waste heat , 1998 .

[4]  Yi Jiang,et al.  A new type of district heating method with co-generation based on absorption heat exchange (co-ah cycle) , 2011 .

[5]  José María Sala,et al.  Determination of energy and exergy of waste heat in the industry of the Basque country , 1998 .

[6]  José María Sala,et al.  Technological recovery potential of waste heat in the industry of the Basque Country , 1997 .

[7]  Chuguang Zheng,et al.  Exergy cost analysis of a coal fired power plant based on structural theory of thermoeconomics , 2006 .

[8]  Christian Schweigler,et al.  Application of customized absorption heat pumps for utilization of low-grade heat sources , 2007 .

[9]  Paul Upham,et al.  Don’t lock me in: Public opinion on the prospective use of waste process heat for district heating , 2012 .

[10]  Sunwon Park,et al.  Optimization of a waste heat utilization network in an eco-industrial park , 2010 .

[11]  R. W. Timmerman.  Utilization of power plant waste heat for heating , 1977 .

[12]  H. Torio,et al.  Development of system concepts for improving the performance of a waste heat district heating network with exergy analysis , 2010 .

[13]  Mehmet Kanoglu,et al.  Exergoeconomic analysis and optimization of combined heat and power production: A review , 2009 .

[14]  J. Karkheck,et al.  Prospects for the utilization of waste heat in large scale district heating systems , 1977 .

[15]  Silvia A. Nebra,et al.  Exergoeconomic analysis of the power generation system using blast furnace and coke oven gas in a Brazilian steel mill , 2009 .

[16]  R. E. Sonntag,et al.  Fundamentals of classical thermodynamics , 1973 .