On the Characteristic Surface of a Steam Boiler : 6th Report, The Effect of Stoking Interval on Some Hand Firing Steam Boiler

Abstract

Usually, we operate hand firing steam boiler in the state of damper opening constant, and stoke at certain interval. And then, excess air factor is changed between certain consecutive stokings. On the contrary, on most chain grate stoker boiler, for each fuel consumption, excess air factor, which give a maximum efficiency curve are decided. For the hand firing boiler, excess air factor has been changed, therefore, efficiency is apt to decrease comparing with one of the chain grate stoker boiler. In this paper, an experiment conducted for the purpose of finding out to what extent the stoking interval affect the efficiency, has been described. And we give a proper stoking interval, the quantity of coal for each stoking, and excess air factor in the state of maximum efficiency.