GB197728A - Method of and means for automatically regulating the secondary supply of air to gas generators - Google Patents

Abstract

197,728. Moore, S., and Hunter, C. Feb. 15, 1922. Float valves; valves actuated by rotary motors; clockwork and magnetically actuated valves.-In operating water-gas producers in which secondary air is supplied for the combustion of gases for heating a coal gas retort, the volume of secondary air is automatically controlled by devices which may be dependent upon the primary air supply so that the secondary air supply is gradually increased during the " blow " period. In Fig. 1 the secondary air supply pipe A is provided with a valve C connected to a lever D to which is attached a rod H carrying a float R working in a chamber S, and a plunger T<1>. Water is supplied by an inlet S<1> and flows through outlets T<2>, S<2> and an overflow S<4>. To open valve C, valve S' on pipe S<2> is closed, water rises in the chamber S, raising the float R, rod H and plunger T<1> until the latter closes the outlet T<2>, whereupon the water rises more rapidly and causes valve C more rapidly to open. Valve C is closed by opening valve S<3> and emptying chamber S. The valve S<3> may be interconnected with the valve controlling either the primary air blast or the steam to the producer. In a modification, a ball float in a cistern may operate the air valve in a similar manner. In Fig. 4 an air turbine L may operate a rack J through gear wheels N<1> or a clockwork motor may replace the turbine, the rack pinion having teeth over only a portion of its periphery, so that when the pinion moves out of engagement with the rack the valve closes. In another modification, the valve is operated by a solenoid in series with a resistance so arranged that the resistance is diminished when the valve is being opened, causing the rate of opening to be increased. Specification 168,951, [Class 55 (i), Coking &c.] is referred to.