Abstract: Condensate released from traps on a chemical distillation reboiler is piped to a flash tank where steam is flashed off as condensate pressure is reduced. The steam is recondensed by contact with water obtained from heat exchangers and the condensate-water mixture collects in the flash tank where it may be pumped to a mixing tank remotely located at a steam boiler water purification plant. At the mix tank, excess condensate water mixture is released into a sewer or fresh make-up river water is added as required to satisfy boiler water needs. Mix ratio is controlled by mix tank pressure and in normal operation this stream provides 100% of the boiler feed water requirements.

Abstract: An economizer system for preheating feed or return water in a high pressure steam or hot water smoke-tube boiler having a smoke-heated convection-effecting portion. The smoke tubes at the end of the smoke tube convection-effecting portion are surrounded by a jacket with staggered baffle plates penetrated by the smoke tubes so as to form a wavy or serpentine flow channel for the feed or return water in forced counterflow to the flue gas. The jacket may be encircled by a second jacket forming a chamber which may be filled with insulating material or form a preheater in the water supply system to the flow channel of the economizer.

Abstract: A preheating device for hot water heaters which employs hot gases of combustion from the flue to preheat incoming cold water and to continually preheat water stored in the water tank by natural recirculation. Use of the device provides for increased fuel efficiency because hot combustion gases from the heat source are used for warming of water before venting to the atmosphere, the result being an average increased temperature within the tank so that lesser amounts of fuel are required to reach any desired hot water temperature.

Abstract: An improved arrangement for preheating feedwater in a steam boiler system prior to the feedwater entering a fuel economizer in order to prevent corrosion due to condensation of flue gas in the fuel economizer and in the exhaust of the boiler system. The feedwater, prior to entering the fuel economizer, is heated in a preheater with a portion of steam from a boiler. The amount of steam entering the preheater is regulated by two temperature control valves. A first temperature control valve is regulated by the temperature of the feedwater prior to entering the fuel economizer. A second temperature control valve is regulated by the temperature of the flue gas in the boiler exhaust stack.

Abstract: A heat exchanger is interposed between the exhaust duct of a water boiler and the chimney or flue, and a water conduit, connected to the water return line of the heating system, is disposed within the heat exchanger in heat exchange relationship with the exhaust gases. In this manner, up to 85% of the thermal energy within the exhaust gases is recovered and imparted to the water for pre-heating the same prior to the transmission of the pre-heated water into the boiler for additional heating, or alternatively, directly into the water heating system. A filter assembly is preferably interposed between the heat exchanger and the chimney or flue so as to filter the cooled gases prior to the emission of the same into the atmosphere. As a result, solid particles, and a substantial portion of sulfur dioxide, is removed from the exhaust gases so as to reduce pollution conditions.

Abstract: A device for the reduction of heat losses due to flue gasses in boilers of the type having a flue and which are operated with oil or gas and wherein the boiler has a heat exchanger in the flue serving to reduce the temperature of the flue gases. A heat pipe having a U-shaped configuration is disposed in the flue with the heat exchanger being positioned between the pipe ends, and the warm side of the heat pipe is between the boiler and the heat exchanger.

Abstract: Apparatus for supplying feedwater to a steam generator, such as a waste-heat boiler, includes the feature of degassing feedwater at a degassing station by way of a suitable degassing means, the feedwater being degassed by being heated to boiling temperature. Prior to reaching the degassing means at the degassing station the feedwater supplied thereto is heated by being placed in a heat-exchanging relationship with respect to water which has already been degassed by the degassing means at the degassing station. The degassed water which is thus cooled by giving up its heat to the water supplied to the degassing means is then delivered to the steam generator at a temperature which is substantially less than the temperature of the water at the degassing means.