Experimental Study of Supercritical Water Gasification Using Fine Carbon Suspended Glucose Solution

Akifumi Nakamura1, Eiji Kiyonaga1, Takeshi Miura1, Yoshihisa Shimizu1, Yoji Noda2, Tomoaki Minowa3, and Yukihiko Matsumura4. (1) Energia Economic & Technical Research Institute, The Chugoku Electric Company Power Co., Inc., 3-9-1 Kagamiyama, Higashihiroshima, 739-0046, Japan, (2) Toyo Koatsu Co., Ltd, 2-1-22, Kusunokicho, Nishiku, Hiroshima, 733-0002, Japan, (3) Biomass Technology Research Center, National institute of Advanced Industrial Science and Technology (AIST), 2-2-2 Hiro-Suehiro, Kure, 737-0197, Japan, (4) Hiroshima University, 1-4-1 Kagamiyama, Higashi-hiroshima-shi, Hiroshima, 739-8527, Japan

In the supercritical water gasification, a reactor that fills the catalyst has been used to improve the efficiency of the gasification reaction so far. However, there is a problem that a reactor cause blockage easily in the catalyst packed bed reactor. In this study, a novel supercritical water gasification process, where catalyst packed bed reactor didn't be used and fine powder activated carbons were suspended in the feedstock to improve the efficiency of the gasification reaction, was proposed. And experimental study was conducted. The experiment was conducted with experimental gasification equipment that was able continuously to supply feedstock. The glucose solution in which fine powder activated carbon were suspended was gasified in 600C, 25MP supercritical water, and then the amount of generation gas was measured and the composition of the generation gas was analyzed(SHIMAZU GC-2014). The effect of the gasification reaction efficiency improvement with the fine powder activated carbon was confirmed from the amount of the generation gas, the generation gas composition, and the carbon gasification rate. The density of the glucose solution was 1-10wt% and the amount of activated carbon was 0-15wt% of the glucose. The fine carbon suspended glucose solution was preheated up to 580C by an electric heater, was supplied to the reactor maintained in 600C with an electric heater with 25MPa afterwards, and gasified. The amount of processing of the fine carbon suspended glucose solution was 65 g/min (About 100 kg/d).