Hydrogen-based energy storage targeting for the integrated heat and power system in urban-industrial symbiosis

Abstract

Greenhouse gaseous (GHG) emissions are significant global challenges, leading to climate change. The industrial sector is the most significant contributor to global energy consumption, burning fuel and emitting GHG. This study aims to extend the Total Site Heat Integration (TSHI) methodology for clean decentralised energy systems to power an eco-city with Urban-Industrial Symbiosis (UIS). The system is assumed to work on the UIS's thermal energy and power systems. A Pinch-based cascade analysis is extended to simulate the hydrogen energy storage to recover thermal and electricity in the energy system, which can determine the hydrogen storage capacity, known as Total Site - Hydrogen Storage Cascade (TS-H2SC). The hydrogen energy storage system is configured to store excess electricity, and waste heat energy potential to be consumed later or sold off by the system. The methodology is demonstrated with an illustrative case study to integrate hydrogen storage for energy recovery in an Urban-Industrial Energy System. In the illustrative case study, the total electricity to be sold to the grid is found at 701 kWh, while the capacity of the Liquid Organic Hydrogen Carrier (LOHC) system is targeted at 2,616 kg of loaded LOHC. The application of a hydrogen storage system is compared with thermochemical energy storage and power storage systems. The research found that the LOHC system with condensing steam turbine rather than ORC has the most significant potential for energy saving in the UIES.