Two double-arch boilers with w-shaped flame are under constructing in Zhuzhou and Leiyang Power Plants in Hunan Province. Because the coal rank in Hunan Province is complex

and the anthracite coal is low in grade

and the application of double-arch boiler with w-shaped flame is quite different

the combustion efficiency was not very satisfactory. Now poor grade anthracite is not used permanently in double-arch boiler with w-shaped flame. So it is necessary to investigate the technological characteristic

performance and issues of the double-arch boiler with w-shaped flame.