In recent years, various small-scale gasifiers less than 2MWe have been introduced in Japan under a feed-in tariff (FIT). Among them some gasifiers have been designed in Europe for pellets of properties satisfying the EN Plus A1 standard. However, even when the above requirement of EN Plus A1 is satisfied, there have been cases of severe clinker troubles within one week or shorter operation period. We found that it is because of the melting property of the pellets which is related to the chemical composition of minerals contained in the wood.
