A NEW METHODOLOGY FOR THE IMPLEMENTATION OF TRIGENERATION IN INDUSTRY: APPLICATION TO THE KRAFT PROCESS

A systematic methodology is proposed to assist in the positioning of trigeneration units in industrial processes. It provides guidelines for the selection of heat sources and sinks which maximize the benefit derived from the trigeneration while respecting the process constraints and the operating requirements of the turbine and heat pump. The trigeneration unit consists of a steam turbine, a power generator and an absorption heat pump driven by the steam discharge from the turbine. The methodology is applied to the implementation of a unit in a kraft pulping process. It is first illustrated by considering the two components of the trigeneration individually. The retrofit implementation of a complete unit in the spent liquor concentration section of the process is then performed. It is shown that substantial energy gains could be made through the implementation of trigeneration.

[1]  James M. Douglas,et al.  Conceptual Design of Chemical Processes , 1988 .

[2]  Robin Smith.  Chemical process design , 1994 .

[3]  François Maréchal,et al.  A dual representation for targeting process retrofit, application to a pulp and paper process , 2005 .

[4]  A. Hammache,et al.  Water and energy savings at a kraft paperboard mill using process integration , 2005 .

[5]  B. Linnhoff,et al.  Pinch analysis : a state-of-the-art overview : Techno-economic analysis , 1993 .

[6]  Francis Meunier,et al.  Co- and tri-generation contribution to climate change control , 2002 .

[7]  G. Sundberg,et al.  Project financing consequences on cogeneration: industrial plant and municipal utility co-operation in Sweden , 2003 .

[8]  Laszlo Emho,et al.  District Energy Efficiency Improvement with Trigeneration: Basic Considerations and Case Studies , 2003 .

[9]  R. Schneider,et al.  Trigeneration in the food industry , 2002 .

[10]  F. Maréchal,et al.  Analyse énergétique d’évaporateurs par la méthode de la double représentation , 2007 .

[11]  Piero Colonna,et al.  Industrial trigeneration using ammonia–water absorption refrigeration systems (AAR) , 2003 .

[12]  Joel Hernández-Santoyo,et al.  Trigeneration: an alternative for energy savings , 2003 .

[13]  Antonio Piacentino,et al.  Energy saving in airports by trigeneration. Part I: Assessing economic and technical potential , 2006 .

[14]  V Havelský,et al.  Energetic efficiency of cogeneration systems for combined heat, cold and power production , 1999 .