Transient characteristics of a parabolic trough direct-steam-generation process

Abstract Solar-powered direct steam generation (DSG) is attractive for power generation and industrial utilization due to the combination of renewable-energy source and clean energy carrier. An improved SIMPLE algorithm ensuring the dual roles of pressure acting on velocity and density fields is developed to realize thermo-hydraulic completely-coupled modeling of a typical DSG loop with transient phase-change and multiple flow-patterns. The excitation-response characteristics of the loop were investigated under various step-variations of direct normal irradiance (DNI), inlet mass flowrate (min) and inlet temperature (tin). Increasing DNI (decreasing min) is found to narrow the preheating-evaporation regions and expand the superheating region, and vice versa. While under step-variations of tin, the evaporation region almost remains unchanged (about 403 m). The water slides to a lower temperature faster than climbs to a higher one under variations of DNI (up to 670s vs. 2960s) and min (up to 1184s vs. 4420s), simultaneously the outlet temperature (tout) staying a monotonical response-trend. However, under tin variations, tout holds a higher-order trait. The responses of both pressure and velocity are tightly coupled and always hold higher-order trait. The response time of the total mass in the loop is almost 2.5 to 5.5 times as fast as tout.

[1]  Xinhai Xu,et al.  Heat transfer fluids for concentrating solar power systems – A review , 2015 .

[2]  Robert Pitz-Paal,et al.  Steam temperature stability in a direct steam generation solar power plant , 2011 .

[3]  Su Guo,et al.  Real-time dynamic analysis for complete loop of direct steam generation solar trough collector , 2016 .

[4]  Markus Eck,et al.  Dynamics and control of parabolic trough collector loops with direct steam generation , 2007 .

[5]  Saad Mekhilef,et al.  A review on solar energy use in industries , 2011 .

[6]  Markus Eck,et al.  The DISS Project: Direct Steam Generation in Parabolic Trough Systems. Operation and Maintenance Experience and Update on Project Status , 2001 .

[7]  Chang Xu,et al.  Model and control scheme for recirculation mode direct steam generation parabolic trough solar power plants , 2017 .

[8]  Soteris A. Kalogirou,et al.  The potential of solar industrial process heat applications , 2003 .

[9]  Markus Eck,et al.  Simulation of transient two-phase flow in parabolic trough collectors using Modelica , 2005 .

[10]  Markus Eck,et al.  Direct steam generation in parabolic troughs: Final results and conclusions of the DISS project , 2004 .

[11]  Robert Pitz-Paal,et al.  Transient models and characteristics of once-through line focus Systems , 2015 .

[12]  Lu Li,et al.  Thermal load and bending analysis of heat collection element of direct-steam-generation parabolic-trough solar power plant , 2017 .

[13]  M. Berenguel,et al.  Direct steam generation in solar boilers , 2004, IEEE Control Systems.

[14]  Zhonghao Rao,et al.  High-performance solar steam generation of a paper-based carbon particle system , 2018, Applied Thermal Engineering.

[15]  M. Darwish,et al.  A UNIFIED FORMULATION OF THE SEGREGATED CLASS OF ALGORITHMS FOR FLUID FLOW AT ALL SPEEDS , 2000 .

[16]  Congliang Huang,et al.  Surface/interface influence on specific heat capacity of solid, shell and core-shell nanoparticles , 2017 .

[17]  Jie Sun,et al.  Prospective fully-coupled multi-level analytical methodology for concentrated solar power plants: Applications , 2017 .

[18]  Jan Fabian Feldhoff,et al.  Economic Potential of Solar Thermal Power Plants With Direct Steam Generation Compared With HTF Plants , 2010 .

[19]  R. Pitz-Paal,et al.  Simulation of thermal fluid dynamics in parabolic trough receiver tubes with direct steam generation using the computer code ATHLET , 2014 .

[20]  Ya-Ling He,et al.  Integration between supercritical CO2 Brayton cycles and molten salt solar power towers: A review and a comprehensive comparison of different cycle layouts , 2017 .

[21]  Markus Eck,et al.  Assessment of Operation Modes for Direct Solar Steam Generation in Parabolic Troughs , 2002 .

[22]  Ming-Jia Li,et al.  Review of methodologies and polices for evaluation of energy efficiency in high energy-consuming industry , 2017 .

[23]  Babatunde A. Ogunnaike,et al.  Process Dynamics, Modeling, and Control , 1994 .

[24]  H. Kretzschmar,et al.  The IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam , 2000 .

[25]  Song-Zhen Tang,et al.  Fouling characteristics analysis and morphology prediction of heat exchangers with a particulate fouling model considering deposition and removal mechanisms , 2017 .

[26]  Sebastián Dormido,et al.  Chattering in dynamic mathematical two-phase flow models , 2012 .

[27]  Sebastián Dormido Bencomo,et al.  Modeling and simulation of two-phase flow evaporators for parabolic-trough solar thermal power plants. , 2013 .

[28]  Bernd Epple,et al.  Progress in dynamic simulation of thermal power plants , 2017 .

[29]  M. Eickhoff,et al.  Applied research concerning the direct steam generation in parabolic troughs , 2003 .

[30]  Ya-Ling He,et al.  Evaluation and optimization of melting performance for a latent heat thermal energy storage unit partially filled with porous media , 2017 .

[31]  J. J. Serrano-Aguilera,et al.  Thermal hydraulic RELAP5 model for a solar direct steam generation system based on parabolic trough collectors operating in once-through mode , 2017 .

[32]  Jie Sun,et al.  Prospective fully-coupled multi-level analytical methodology for concentrated solar power plants: General modelling , 2017 .

[33]  Gernot Gwehenberger,et al.  Minimizing greenhouse gas emissions through the application of solar thermal energy in industrial processes , 2007 .