Simultaneous heat integration and economic optimization of the coal-to-SNG process

Abstract The area of the heat recovery network has a significant impact on the economic performance of the coal-to-SNG process. This paper proposes a superstructure of the methanation unit, and the number of the methanator, recycle gas extraction position (RGEXP), as well as the operating conditions, are optimized. Simultaneous optimization and heat integration are performed along with the area targeting to weigh against the operating cost and capital cost of the coal-to-SNG process. Area cost is evaluated by assuming vertical heat transfer between cold and hot composite curves. A sequential method is used to provide initial values for the simultaneous model. Results show that Case7 (2) has the best economic performance, which has 7 methanators and recycled gas is extracted from the 2nd methanator. The total annual cost of Case7 (2) can be reduced by 10.36 MM$·a−1, and exergy efficiency can be also improved by 0.77% compared with an industrial plant.

[1]  Xiaosong Zhang,et al.  Techno-economic performance and cost reduction potential for the substitute/synthetic natural gas and power cogeneration plant with CO2 capture , 2014 .

[2]  Ignacio E. Grossmann,et al.  Disjunctive model for the simultaneous optimization and heat integration with unclassified streams and area estimation , 2018, Comput. Chem. Eng..

[3]  Yafeng Han,et al.  Techno-economic evaluation of strategies for addressing energy and environmental challenges of industrial boilers in China , 2017 .

[4]  Siyu Yang,et al.  Synthetic natural gas as an alternative to coal for power generation in China: Life cycle analysis of haze pollution, greenhouse gas emission, and resource consumption , 2018 .

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

[6]  R. Chein,et al.  Numerical simulation on the effect of operating conditions and syngas compositions for synthetic natural gas production via methanation reaction , 2016 .

[7]  Jeehoon Han,et al.  Integrated process for electrocatalytic conversion of glycerol to chemicals and catalytic conversion of corn stover to fuels , 2018 .

[8]  Cheng-Liang Chen,et al.  Organic Rankine Cycle for Waste Heat Recovery in a Refinery , 2016 .

[9]  Ibrahim Dincer,et al.  Thermoeconomic analysis of power plants: an application to a coal fired electrical generating station , 2003 .

[10]  Christodoulos A. Floudas,et al.  Optimization framework for the simultaneous process synthesis, heat and power integration of a thermochemical hybrid biomass, coal, and natural gas facility , 2011, Comput. Chem. Eng..

[11]  Christos T. Maravelias,et al.  An Optimization-Based Approach for Simultaneous Chemical Process and Heat Exchanger Network Synthesis , 2018 .

[12]  Manfred Morari,et al.  Area and capital cost targets for heat exchanger network synthesis with constrained matches and unequal heat transfer coefficients , 1990 .

[13]  Christos T. Maravelias,et al.  Simultaneous Utility and Heat Exchanger Area Targeting for Integrated Process Synthesis and Heat Integration , 2017 .

[14]  Yang Li,et al.  Simultaneous optimization and heat integration of the coal-to-SNG process with a branched heat recovery steam cycle , 2018, Comput. Chem. Eng..

[15]  François Maréchal,et al.  Thermo-economic optimisation of the polygeneration of synthetic natural gas (SNG), power and heat from lignocellulosic biomass by gasification and methanation , 2012 .

[16]  Ignacio E. Grossmann,et al.  Simultaneous optimization and heat integration of chemical processes , 1986 .

[17]  Luis M. Serra,et al.  Analysis of process steam demand reduction and electricity generation in sugar and ethanol production from sugarcane , 2007 .

[18]  Alexander W. Dowling,et al.  A framework for efficient large scale equation-oriented flowsheet optimization , 2015, Comput. Chem. Eng..

[19]  Richard Turton,et al.  Analysis, Synthesis and Design of Chemical Processes , 2002 .

[20]  Xiao Feng,et al.  Simultaneous heat integration and techno-economic optimization of Organic Rankine Cycle (ORC) for multiple waste heat stream recovery , 2017 .

[21]  I-Lung Chien,et al.  Design and Economic Evaluation of a Coal-to-Synthetic Natural Gas Process , 2015 .

[22]  Siyu Yang,et al.  Modeling, simulation, and techno-economic analysis of Lurgi gasification and BGL gasification for coal-to-SNG , 2017 .

[23]  Yang Liu,et al.  Conceptual Design of the Coal to Synthetic Natural Gas (SNG) Process Based on BGL Gasifier: Modeling and Techno-Economic Analysis , 2017 .

[24]  François Maréchal,et al.  Thermo-economic optimisation of the integration of electrolysis in synthetic natural gas production from wood , 2008 .

[25]  Yu Qian,et al.  Techno-economic and environmental analysis of coal-based synthetic natural gas process in China , 2017 .

[26]  Zdravko Kravanja,et al.  Simultaneous optimization models for heat integration. , 1990 .