The Spray Flow II (SP5II) Atmospheric Deaerators offers a Guaranteed performance of .005 cc/1 from 0-100% load.
How it works :
Modulated make-up water is sprayed through a stainless steel spring-loaded nozzle into a stainless steel internal vent condenser located in the scrubbing section. The nozzle produces a thin conical sheet of water, which condenses the vapors while permitting oxygen to exit through the unrestricted atmospheric vent. Pumped low temperature returns are also sprayed through the nozzle. Gravity returns flow unrestricted to the scrubbing section.
The combined make-up and returns in the scrubbing section is heated with steam and recycled deaerated water from the deaerating section. Both the steam and the deaerated water enter the scrubbing section through separate stainless steel manifolds. The perforated steam manifold provides jets of steam to vigorously scrub the major portion of the dissolved oxygen from the make-up, pumped returns, and gravity returns. The temperature in the scrubbing section is controlled at 208oF at sea level, which assures the release of the majority of the dissolved oxygen without flash loss.
The scrubbing section water, which is nearly fully deaerated, is continuously recycled to the deaerating section where it is sprayed through stainless steel, wide angle, full cone nozzles. Steam enters the deaerating section in response to the temperature in the scrubbing section. Since the cycle is continuous, pure steam is always available for final deaeration. The last traces of oxygen are removed at the point of contact with the purest steam. Excess, fully deaerated water flows continuously from the deaerating section to the scrubbing section through the stainless steel recycle manifold. Trapped returns are piped to the deaerating section where flash steam is prefentially used for final deaeration.
Since the recycle pump capacity exceeds the deaerator capacity by at least 25%, the deaerator is able to meet 0.005 cc/l, from zero to 100% load. This same feature also enables the deaerator to supply fully deaerated water to the boiler on start-up. Rapid load changes and on-off boiler feedwater controls. which are very troublesome for other atmospheric Deaerators, will not affect the Spray Flow II's performance or operation.
How it works:
Incoming undeaerated water and pumped returns enter the deaerator through a spring-loaded stainless steel nozzle, which directs the flow in conical sheets into the steam atmosphere of the direct contact vent condenser. At this point, the water temperature is raised to within a few degrees of steam temperature and most of the corrosive, non-condensable gases are removed. The water is directed by a stainless steel tray section into the Jet Spray atomizing valve. Here a high velocity of incoming pure steam literally atomizes the water into minute particles. This violet scrubbing action removes the last traces of dissolved gases. The hot, deaerated water then falls to the storage compartment for boiler use.
Steam Flow - Steam initially enters the deaerator through a special, stainless steel Jet Spray atomizing valve. This valve is designed to fully atomize and provide complete deaeration under all load conditions. This design insures that the purest steam comes in contact with the purest water. Once this high velocity steam mechanically shakes out the last traces of non-condensable gases from the water, it flows upward into the preheater area where it meets the incoming make-up water and pumped returns. This water continuously condenses the steam, which preheats and releases the non-condensable gases into the internal vent condenser where they are metered harmlessly to the atmosphere. This action causes more steam to be drawn into 6the system to complete the cycle.