GB225898A - Improvements in or relating to steam generating installations - Google Patents

Abstract

225,898. Withers, J. S., (Deutsche Evaporator-Akt.-Ges.). July 11, 1923. Feed-water, heating.-To. prevent overheating in the economizer 21, Fig. 2, when the pressure operated feed valve 3 is closed, a valve 23 in a by-pass may be so operated by a thermostatic device 22 that a flow of water is maintained between the economizer and the boiler. A permanent small flow is maintained through a valve 25. In a modification, a constant flow of water is maintained through the economizer, excess water being received when the boiler feed requirements are small by an equalizing chamber from which it is subsequently withdrawn when the boiler feed requirements are large. A thermostat increases the flow of water through the economizer when the water temperature rises and decreases it when the water temperature falls. The flow is also controlled by a float in the equalizing chamber. Water overflows from the equalizing chamber back to the feed tank. In a further modification, the equalizing chamber 39, Fig. 4, is connected to the boiler steam and water spaces and serves as a storage chamber. When the pressure operated valve 3 is fully open the feed pump 36 takes water from the lower part of the chamber 39 in addition to that supplied through the economizer 21. At the same time hot water flows from the boiler through a pipe 28 into the upper part of the chamber. When the valve 3 is closed, hot water is forced into the boiler through the pipe 28 by the water entering the lower part of the chamber.