Heat recovery and power targeting in utility systems

New heat recovery and power targeting models have been developed to evaluate and improve site-wide heat recovery and distribution, and cogeneration systematically. Previous graphical methods for utility system targeting have been proposed based on the assumption of only steam latent heat in the utility system. In this work, a practical graphical approach based on extended site composite curves to quantify site steam targeting has been proposed to provide realistic utility targeting methods, allowing for BFW (boiler feedwater) preheating and steam superheating in steam generation, and steam desuperheating for process heating. Condensate heat recovery from steam usage has also included in the graphical method. A new cogeneration targeting model has been developed including practical limits such as steam mains superheat and turbine exhaust dryness. These new realistic energy and power targeting methods improve the accuracy of the targeting, and overcome the shortcomings of previous targets.

[1]  Luis Puigjaner,et al.  Targeting and design methodology for reduction of fuel, power and CO2 on total sites , 1997 .

[2]  P. T. Varbanov.  Optimisation and synthesis of process utility systems , 2004 .

[3]  Robin Smith,et al.  Design and Optimization of Flexible Utility Systems Subject to Variable Conditions: Part 1: Modelling Framework , 2007 .

[4]  Jiří Jaromír Klemeš,et al.  A process integration targeting method for hybrid power systems , 2012 .

[5]  Robin Smith,et al.  Chemical Process: Design and Integration , 2005 .

[6]  John G. Brisson,et al.  Targeting the optimum steam system for power generation with increased flexibility in the steam powe , 2011 .

[7]  Simon Harvey,et al.  Targeting for energy efficiency and improved energy collaboration between different companies using , 2011 .

[8]  Antonis C. Kokossis,et al.  Conceptual optimisation of utility networks for operational variations—I. targets and level optimisation , 1998 .

[9]  Ignacio E. Grossmann,et al.  Optimal scheduling of industrial combined heat and power plants under time-sensitive electricity prices , 2013 .

[10]  Jiří Jaromír Klemeš,et al.  Total Site targeting with process specific minimum temperature difference (ΔTmin) , 2012 .

[11]  Bodo Linnhoff,et al.  A User guide on process integration for the efficient use of energy , 1994 .

[12]  Igor Bulatov,et al.  Integrating waste and renewable energy to reduce the carbon footprint of locally integrated energy sectors , 2008 .

[13]  Petar Sabev Varbanov,et al.  Total Sites Integrating Renewables With Extended Heat Transfer and Recovery , 2010 .

[14]  Bodo Linnhoff,et al.  Total site targets for fuel, co-generation, emissions, and cooling , 1993 .

[15]  Sergio Mussati,et al.  Optimal synthesis and design of Heat Recovery Steam Generation (HRSG) via mathematical programming , 2011 .

[16]  Robin Smith,et al.  Graphical cogeneration analysis for site utility systems , 2014, Clean Technologies and Environmental Policy.

[17]  Robin Smith,et al.  A novel approach for retrofit and operations management of existing total sites , 1998 .

[18]  François Maréchal,et al.  Identification of the optimal pressure levels in steam networks using integrated combined heat and power method , 1997 .

[19]  Alan Wright.  Cogeneration: Combined heat & power thermodynamics and economics: J. H. Horlock. Pergamon Press (1987) 210 pp. £9.95 , 1989 .