Abstract
This paper deals with extensive tests conducted during 1921 on a large Type “W” Stirling boiler at the Connors Creek power house of The Detroit Edison Company. Four different arrangements of the boiler baffling were employed and the results obtained with each are shown. Separate tests were made using four different grades of coal in order to determine which was most suitable. Several operating tests were made to obtain data on different methods of banking, the effect on the temperature of flue gas of varying the time interval between the blowing of flues, and different methods of operating boilers during the low-load period at night.
From the results of the tests with different baffle arrangements, seventeen of these large boilers have been rebaffled with a resulting improvement in boiler-plant efficiency and an increase in the degree of superheat of the steam. Additional improvement is expected as more boilers are rebaffled. From the data and results of these tests, the Babcock & Wilcox Company, working in conjunction with The Detroit Edison Company, have developed a new design of this type of boiler. Four boilers of the new design have been installed in the Marysville power house of The Detroit Edison Company, but economy results on the installation are not yet available.
