Sustainability design and analysis of a regional energy supply CHP system by integrating biomass and solar energy

A regional energy supply system integrating biomass and solar energy combined the heat and power system (RESCHP) is developed. This hybrid energy power supply system retrofits the traditional regional energy supply (RES) system by coupling a solar-driven biomass gasification system, a gas turbine system, and a solar collecting system. In order to better utilize the high temperature sensible heat of syngas, a new integrated design is developed. The heat generated by the syngas is utilized to preheat the gasifying agent and feedstock. The effect of several key parameters on the composition of the syngas is investigated. At the optimal design point, the system is analyzed for energy, exergy, economy and emissions (4E). The results showed that the energy and exergy efficiencies of the RES-CHP system reach 42.57% and 39.52%, respectively. Economic analysis shows that over the projected 10 years, the proposed system has a positive NPV and better investment value. RES-CHP system provides low CO2 emissions about 4.146 kt/year, which is 32.3% less than the reference system.