Development on Hydrogen Production System from Solid Wastes with High Temperature Steam

摘要

The authors are developing the gasification system for generating hydrogen-rich gas from solid wastes such as woody biomass and waste plastic, which utilizes high temperature steam (over 1273K) as both a gasifying and heat supplying agent. This paper presents the results of two different kinds of experiments. First, the results of the steam gasification experiments employing the lab-scale equipment are reported. Second, the preliminary test results of the demonstration plant are reported.rnJapanese cedar and two kinds of plastic samples are used as the feedstock in the lab-scale gasification experiments. The experimental results of the hydrogen yield approach the theoretical value as the gasification temperature and the steam supply increased. The largest hydrogen concentration was 52.4 [vol%] when Japanese cedar was used, the reaction temperature was 1173K and the steam/carbon molar ratio was 5.0, and 58.5 [vol%] when the plastic feedstock was used, the reaction temperature was 1173K and the steam/carbon molar ratio was 5.8.The gasification performance of the demonstration plant is investigated in the preliminary tests using wood chips as fuel. The plant capacity is 50 kg/hour. Hydrogen concentration was from 40 to 50% in the gasification gas, and about 30% in the reformed gas. The cold gas efficiency was calculated to be 38% based on the test results of the demonstration plant.