Evaluation of Pyrolysis Conditions in Gasification Melting System for Municipal Solid Waste

Kazutada Miyakoshi*, Takashi Miura**, Toshiya Komatsu**, Shuji Himeno** and Kiyoshi Momonoi**
* CHUOU SEKKEI Engineering Co., Ltd.
** Department of Civil and Environmental Engineering, Nagaoka University of Technology
+ Correspondence should be addressed to Toshiya Komatsu:
(1603-1, Kamitomioka-cho, Nagaoka-shi, Niigata 940-2188 Japan)

Abstract
The degree of pyrolysis of municipal solid waste (MSW) is very important in a gasification melting system for optimal control. The purpose of this study is to decide on the pyrolysis temperature and reaction time of MSW for suitable control in a gasification melting system.
In this study, we used a Refuse Derived Fuel (RDF) for the pyrolysis experiment. We measured the mass balance of char, tar and pyrolysis gases to determine their influence on different pyrolysis conditions. Furthermore, the thermogravimetric curves and the ignition temperature with the use of improved micro heating method of chars were measured to estimate the combustion characteristics of the chars. The four following items 1) lower calorific value of char, 2) lower calorific value of pyrolysis gas, 3) the generation rate of char, 4) the fuel ratio of char, were selected to determine the most suitable pyrolysis condition.
Comprehensive evaluation of each condition was carried out with these items. It was found out that a pyrolysis temperature at 450~500*C[Celsius degeree] and a reaction time of 60 minutes was the optinum.

Key words: gasification melting system, pyrolysis conditions, pyrolysis char, lower calorific value, ignition temperature