Exergetic and environmental assessments of hydrogen production via waste tire gasification with co-feeding of CO2 recycled
Mattana Santasnachok, Teeranun Nakyai
Abstract
Hydrogen can be produced from natural gas, coal, biomass, and waste materials as an energy source applicable in many industries. Waste tires can be converted into energy by gasification because they contain numerous organic components, higher heating value, and high volatile content. The purpose of this study is to present the simulation of the hydrogen production via waste tire gasification using recycled CO2 as a gasifying agent. The influences of steam and CO2 to waste tire ratios on hydrogen yield were identified. The energetic and exergetic analyses were applied to evaluate the performance of the waste tire gasification process. From an environmental point of view, the carbon dioxide emission intensity was used to determine the CO2 emission of the waste tire gasification process. The simulation showed that the highest yield of hydrogen occurs at the gasifier temperature of 800 °C with the steam and CO2 to waste tire ratios of 2.0, and 0.1, respectively. The utilization of CO2 as a gasifying agent can enhance the yield of hydrogen, resulting in an increase of energetic and exergetic efficiencies of 59.58 and 49.39%, respectively. In addition, the use of CO2 recycled with a mixture of air and steam produces the lowest CO2 emission intensity of 10.56 tonne CO2/ tonne H2.