抄録
Methanol use is receiving attention as a method to lower pollutants during of fuel oil combustion in thermal power generation plants. In this study, combustion tests of methanol and fuel oil mixed fuel, was conducted by using a combustion test furnace (standard fuel feed rate was 50l·h-1) which has combustion characteristic similar to thermal power plant boilers. Fuel oils tested in mixtures with methanol were C heavy oil, Minas crude oil, kerosene and naphtha, a static mixer with minimal pressure loss as used.
The main results are as follows.
(1) The use of the static mixer did not affect flame temperature and flue gas properties.
(2) It was difficult to predict NOx emission concentration of mixed fuels from flame temperature and NOx emission of each pure fuel oils. For combustion of the 85% C heavy oil mixture, NOx emission reached a maximum value 1.5 times that for pure C heavy oil combustion. NOx emission of fuel oil mixture was almost same as for pure C heavy oil when mixing rate was 50%.
(3) When flue gas was recirculated with combustion air, NOx emission decreased with increasing flue gas recirculation rate. This trend was the same as for pure fuel oil combustion.
