191i] 



on Surface Combustion 



The 110-Tube Boiler at the Skinningrove Ironworks. 



Six months' continuous experience with our first experimental unit 

 gave us great confidence in its reliability, so that when in the early 

 months of 1911 we received an inquiry from the Skinningrove Iron 

 Co., Ltd., for a boiler of about ten times the capacity of the experi- 

 mental unit, to be fired by means of the surplus gas from their new 

 Otto by-product coking-plant, we had no hesitation in accepting a 

 commission to instal our first large boiler there, under a strict 

 guarantee as to its output and efficiency. This boiler (Fig. 12) was 

 built by Messrs. Richardsons and Westgarth, Ltd., of Middlesbrough, 

 to the design of Mr. Michael Longridge, to whom I had been 



Fig. 13. 



indebted for much valuable advice and encouragement during the 

 earlier experiments. It consists of a cylindrical drum 10 feet in 

 diameter and 4 feet from front to back, traversed by 110 steel 

 tubes, each of 3 inches internal diameter, which are packed with 

 fragments of suitable refractory granular material. To the front of 

 the boiler is attached a specially designed feeding chamber which 

 delivers washed coke oven gas at 60° to 70° Fahr., and under a pres- 

 sure of 1 to 2 inches W.G., to each of the 110 combustion tubes ; this 

 gas, together with a regulated proportion of air from the outside 

 atmosphere, is drawn, under suction from a fan, through a short 

 mixing tube, into each of the said combustion tubes, where it is burnt 



