Thermodynamic evaluation of a novel solar-aided biogas polygeneration system integrated with steam network etwork

The limited resources of fossil fuel and environmental concerns necessitate utilizing renewable resources which are less environmentally harmful. A new cogeneration system integrated with CCS and hydrogen production units is developed and analyzed in detail by introducing biogas and solar energy. The proposed system is presented to provide the heating demand of a utility system by designing a proper heat recovery. Concentrated solar thermal (CST) tower, biogas reformer, gas turbine cycle (GTC), organic Rankine cycle (ORC), pressure swing adsorption (PSA), carbon capture and storage (CCS) as the topping system and steam network (SN) are the components of this system. The devised system is evaluated from the energy point of view. A comprehensive parametric analysis is conducted for assessing the impact of the main parameters. The results demonstrate that integrating the SN and topping system increases the energy efficiency from 51.72% to 60.55%. Consequently, the net power generated by the system is increased from 32.147 MW to 57.634 MW.