Design and detailed examinations of a geothermal-biomass driven integrated multigeneration system with CO2 capturing unit: Stability and 4E evaluations

Abstract

This study develops a unique multigeneration hybrid monoethanolamine (MEA)-based CO2-capture unit powered by geothermal energy and biomass to provide green hydrogen, electricity, a heating effect, a cooling effect, and freshwater. The thermodynamic, thermoeconomic, and environmental methodologies are used to assess the project of this multigenerational plant by employing EES software. This assessment reveals that this plant is capable of delivering green hydrogen at a rate of 122.4 kg/h, while the carbon-capturing unit captures 6.77 kg/h. The energy efficiency and exergy efficiency of the system are respectively determined to be 77.08 percent and 10.47 percent. In addition, the platform's sustainability index, exergo-environmental impact improvement, and the total product cost rate are 1.06, 0.11, and 1.59 $/s, sequentially. Then, some parametric experiments are conducted to observe how this plant behaves under different operational conditions. One conclusion is that improving the high-temperature heat exchanger intake quality is economically advantageous for the system. In addition, a rising tendency in the system's sustainability has been seen once the plant operates at greater geothermal fluid temperature and ambient temperature.