Patent GB-410091-A (GB)
Title: Improvements in or relating to vapour generators
IPC: F22B35/10
Filed: 1932-11-03
Abstract: 410,091. Controlling combustion in furnaces. BAILEY METER CO., 1050, Ivanhoe Road, Cleveland, Ohio, U.S.A.-(Assignees of Dickey, P. S. ; 3813, Euclid Avenue, Cleveland, and Junkins, R. D. ; 1082, Allston Road, Cleveland Heights, both in Ohio, U.S.A.) Nov. 3, 1932, Nos. 31014 and 31015. Convention dates, Nov. 20, 1931 and Dec. 12, 1931. [A Specification was laid open to inspection under Sect. 91 of the Acts, May 11, 1933.] [Class 51 (i).] The fuel supply to a tubulous once-through boiler is controlled in accordance with the rate of steam outflow and also in accordance with the temperature at a predetermined intermediate point in the boiler. The valve 82 controlling the supply of pressure fluid to the servomotor 83 operating the fuel supply valve 5 is actuated in accordance with (1) the movements of the pointers of flow meters 97, 100 in the steam pipe and feed pipe respectively, and (2) the movement of the pointer 33 of a steam pressure gauge 32. The valve 87 controlling the supply of pressure fluid to a servomotor 88 operating a valve 7 in the air supply duct 4 and a damper 28 in the outlet flue is actuated in accordance with (1) the movement of the pointer of a flow meter 6 in the fuel supply pipe 3 and (2) the movement of a pointer 75 of a meter connected by pipes 78, 79 to the flue space of the boiler above and below the water-heating tubes to indicate the rate of gas flow through the boiler. A temperature indicator 35 indicating the temperature at an intermediate point of the boiler may be used in place of the pressure gauge 32 in conjunction with the flow meters 97, 100, to actuate the valve 82. In a modification, the movements of the pointers of the pressure gauge and the temperature indicator are transmitted to the relays to modify the movements of the pointers of the flow meter 97, 100 through self synchronous motors, the rotors of the transmitting generators at the pressure gauge and temperature indicator pointers being selectively connected to either of the receiving motors influencing the movements caused by the pointers of the flowmeters. The switch arm 14, the fuel valve and the lever controlling the air supply valve together with the flue damper may be actuated by motors energized through thermionic valves, the grid circuits of which are controlled by the modified movements of the flow meters. In further modifications, the fuel supply valve, the motor driving the air fan and the flue damper are simultaneously controlled through fluidpressure or electric relays of the kind described above in accordance with either the steam pressure or temperature modified by control in accordance with the temperature at an intermediate point in the boiler. Specification 410,102 is referred to. The Specification as open to inspection under Sect. 91 describes also the control of the water and fuel by the movements of the lever arm of the steam valve, the movements being modified by the temperature at an intermediate point of the boiler or by the steam pressure. This subject-matter does not appear in the Specification as accepted.