Author(s)

N Asami, S Atoji, K Ogawa & H Naramot

Abstract

Optimization and feasibility study on the waste gasification technology applied high-efficient power generation system has been conducted with the aim of further improving net efficiency and economic performance, as well as reducing adverse environmental impacts The preliminary feasibility study showed that the waste pyrolysis and gasification power generation system with gas engine would be suitable for small and medium size of municipal solid waste (MSW) facilities less than 300 t/d. In detailed feasibility studies, four categories of MSW wastes (1,600 - 3,400 kcal/kg) and four different scales of facilities (50 - 300 t/d) were set up as parameters. The waste of 2,100 kcal/kg and the facility of 100 t/d were selected as a references. For the reference facility, the following values were set as the targets relative to the basic performance of a system; the effective cold gas efficiency (>69%), the gross power efficiency (>25%), the net power efficiency (>14%) the emission of DXN (<0.01 ng-TEQ/m3N), and the cost of wastes processing ~20,00O/ton). As a result of system optimization, it was quantitatively confirmed that the high-efficient waste pyrolysis and gasification system would offer greater advantages than the conventional type waste to power systems and development issues involved in the high-efficiency technologies are identified. High-efficient waste pyrolysis and gasification power generation project, which is supported by METI/NEDO, has been conducted since FY2001.

Keywords