Life cycle assessment of energy consumption and CO2 emission by various biogas power generation systems used superheated steam gasification system (Analysis of influences by regional scale, plant scale and various biogases)

Abstract

The power generation system by waste biomass has lately attracted attention. The system can convert waste biomass such as garbage, paper and wood into energy. As a result, regional energy independence ratio of area increases. However, conditions of waste biomass are different from their properties, so it is difficult to use as a fuel. Superheated steam gasification system is one of the effective energy conversion systems in order to available wide range of waste biomass. Waste biomass consumes a lot of energy so as to make superheated steam. Then, it is necessary to take account from the collection and transport to power generation process in order to evaluate CO2 emission totally by means of Life Cycle Assessment (LCA). Therefore, this study proposes modeling analysis for LCA by the waste energy by means of superheated steam gasification system. In this paper, it was evaluated that the effect of processing speed of gasification, population, waste biomass ratio, and boiler fuel on energy balance, CO2 emission and cost in residential area. It was obtained that the optimal processing speed of gasification effects on utilization method of carbonization gas and waste biomass ratio. As a result of LCA, energy independence ratio is improved and CO2 emission is reduced by use of carbonization gas. However, total energy conversion efficiency and surplus power are reduced.

Keywords

• waste biomass energy
• superheated steam gasification
• life cycle assessment
• carbonization gas
• waste biomass ratio