Recycle SPRAY DEAERATOR

FEATURES

Continuous scrubbing recycle system provides for a near complete removal of all oxygen and other non-condensibles at all loads from 0 to 100%.

This design includes a dual compartment vessel with a primary deaeration section and a final polishing section.

ASME Code stamped and National Board approved vessel for 50 psig design pressure.

Continuous scrubbing recycle system provides for a near complete removal of all oxygen and other non-condensibles at all loads from 0 to 100%.

This design includes a dual compartment vessel with a primary deaeration section and a final polishing section. It also contains an automatic internal valve assembly for emergency service in the event of recycle pump failure.

A modulating make-up water system with controller and control valve provides stable pressure environment and water flow.

Factory assembled deaerator packaged systems with support stand, pumps, controls, and other specified accessories are standard.

Custom designed blowdown heat recovery packages and larger deaerator storage compartments available as optional features.

 

ADVANTAGES

The constant recycling of deaerated water at flow rates greater than full deaerator capacity rating flows through the scrubber/polisher section and continues to heat the water and remove as much of the dissolved oxygen and other noncondensibles as mechanically possible below .005 cc/liter regardless of the deaerator loading. Most deaerator designs are once through and do not deaerate effectively at loads below 5%. The recycle also insures water temperatures closest to steam saturation temperature.

This compact design requires an overall vessel height lower than most tray and spray tower designs. The low profile also allows for larger shop assembled deaerator packages to be shipped as a single piece unit without special permits or reassembly in the field.

The recycle spray design along with the high quality modulating steam valves provides for a very stable deaerator internal pressure and as much minimizes potential for destructive cavitation and water hammer.

Maintenance and replacement parts cost are low.

Custom engineered packaged deaerator systems with low headroom and low NPSH pumps. Selection of quality components insures reliable service and there is a single source of responsibility for all major components.

 

OPERATION

Makeup water enters the deaerator through stainless steel spring-loaded spray nozzles and sprays into the stainless steel internal vent condenser which is located above spray chamber. This incoming water is heated instantly by direct contact with steam. Pumped condensate return also enters the spray nozzle chamber. High pressure condensate returns enter the deaerator vessel below the water level bypassing the first stage deaeration. The liberated air and other non-condensibles exit through the continuous vent valve located at the top of the internal vent condenser.

The partially deaerated water is then pumped from the first stage section into the second stage polishing section where it passes through a series of stainless steel spiral full-cone spray nozzles. The last traces of oxygen are removed and the water is heated to near saturation steam temperature. The pumped water flow rate through these nozzles is 120% of the rated deaerator capacity. This excess flow cascades over the vessel internal baffle wall where it is re-circulated back through the polishing spray nozzles. Complete deaeration is guaranteed at all loads from 0% to 100% and thermal stratification is eliminated.