Gasification performance of coals using high temperature air

MEET ( Multi-staged Enthalpy Extraction Technology) system is a new coal/wastes-fired power generation system. In order to establish the MEET system technology, a demonstration plant of commercial scale, MEET-II, was installed. The capacity of the MEET-II is 2 t/day of coal of 4 t/day of RDF. MEET-II consists of a pebble bed slagging-gasifier, a high temperature air generator, and a high temperature air combustion boiler. Gasification with high temperature air results in higher heating value of syngas. Cleaned-up syngas is used as a fuel for the boiler as well as for preheating air up to 1000 °C. Combustion and gasification tests at the MEET-II were conducted using pulverized coal as a fuel. Combustion experiments demonstrated almost complete char combustion with a short residence time, and gasification experiments demonstrated targeted calorific value of syngas, 1000 kcal/m N 3.