52 石炭燃焼場におけるアルカリ金属化合物を含む微粒子生成特性の炭種依存性

抄録

Some metal compounds in coal vaporize and form fumes during the combustion. The fumes are usually contained in the exhaust gas. For coal-fired combined power generation systems such as pressurized fluidized bed combustion, hot metallic vapors are introduced in a gas turbine. As this phenomenon causes corrosion problem of the turbine blades, it is necessary to control the formation of those fumes, which include alkali metal compounds. In this paper, the evolution behavior of alkali metal compounds, especially for sodium compounds, has been studied, using a drop tube furnace with a low-pressure impactor. As a result, concentration profile of sodium in the fine particles has dependence on coal type. On the other hand, the condensation mechanism of sodium seems to be similar in each coal.