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Fig 323 Continuous Heater

The condensation of steam in liquids by means of S&K Direct Contact, Steam Heaters is a very efficient method of heating liquids. Since the steam and its condensate is mixed directly with the fluid, all of the heat in the incoming steam is utilized to heat the liquid. Where the addition of condensate to the mixture is not objectionable, this type of heater is ideal.

S&K manufactures various types of these heaters. The application will determine what particular type is most suitable.

These Direct Contact, High Capacity Steam Heaters provide large quantities of hot water for delivery to a tank or reservoir. A temperature rise of 130° F is possible under certain operating conditions. The hot water capacity is limited only by the maximum size of the heaters offered as standard items. Details on temperature and capacity are given for each type heater.

These heaters are simple in design, having no moving parts. Heating is continuous and fast. Inspection and routine maintenance are greatly facilitated by conveniently placed access ports. Because of high heating efficiency, a relatively small, lightweight size can be used to deliver a large supply of heated liquid.

Injected water is broken up into fine particles by passing through spray nozzles or over trays and intimate mixing is obtained by the turbulence of the liquid streams. The thorough mixing provides for full condensation of the steam transferring maximum heat to the water.

Three piping connections-water inlet, steam inlet, and heated liquid outlet-are all that are necessary. These heaters are adaptable to the use of special materials to meet corrosive and other conditions. They can be furnished in cast iron, fabricated steel, alloy steel, Hastelloy, in any combination of these, or other materials.

APPLICATION The Type 323 Continuous Heater is suitable for operation within a wide range of conditions. It does not require a barometric leg. At atmospheric pressure and above, a temperature rise of 100'F is obtainable. Hot water capacity ranges from 10 gpm to 240 gpm. The Type 323 Heater should not be used if air and other non-condensables are present.

CONSTRUCTION Type 323 Heaters are the most compact in design and construction of the various types manufactured by S&K. Standard units are made with cast iron bodies and diffusers, and with bronze water nozzles, combining tubes and tail bushings.

OPERATION The heater must be installed vertically and water flow must be started before steam flow. The water enters the unit through the top inlet at a pressure great enough to over­come back pressure and pressure drop within the unit. These two factors set the lower pressure limit of the inlet water. (Nozzles can be designed for any pressure above the lower limit.) Steam enters through the side inlet and is entrained by the water jet passing at high velocity through the combining tube. Temperature is controlled by throttling the steam.