Parallel Downflow Deaerators

Parallel Downflow Deaerators offer high performance between the extremes of 100% make-up water (below 50° F), mostly hot condensate and substantial flashing returns.

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Product Overview

The Parallel Downflow Deaerators from Newterra are engineered for superior performance in removing dissolved gases, chiefly oxygen and carbon dioxide, from boiler feedwater, thereby averting corrosion and extending the lifespan of steam-generating systems. These deaerators utilize a parallel downflow design, which enhances contact time between water and steam, ensuring optimal gas removal efficiency. Ideal for high-capacity applications, they offer a seamless integration into large-scale industrial and utility operations. The design prioritizes energy efficiency and operational stability, reducing maintenance requirements and operating costs. Newterra’s Parallel Downflow Deaerators represent a state-of-the-art solution for organizations aiming to improve their thermal efficiency and protect their capital investments in boiler systems.

Features

Construction
Trays: Type 430 Stainless Steel (SS), pan type, one piece
Water distributor: 316 SS Lock-N-Load Spray Nozzles
Design pressure: As required
Deaerator top: Welded Steel Plate, American Society of Mechanical Engineers (ASME) stamped
Storage tanks: Welded Steel Plate, ASME stamped
Vent condenser: Direct Contact Type with Stainless Steel baffling
Deaerating Trays
One piece construction type 430 SS. Easily handled by one person
Trays are designed so that the pressure shell does not come in contact with the un-deaerated water or concentrated non-condensible gases
Trays provide excellent performance having the highest spilling edge and baffling area available in any tray design, which allows for maximum water “break-up” and retention time

Benefits

Handles higher steam flows through the tray stack. Requires the lowest temperature differential of any deaerator to meet operating warranty; typically 20° F or less
Water seal between the trays and the spray section eliminates direct impingement of the spray on the trays and ensures even distribution of the water over the tray stack
Use of trays with less open area than required in counterflow operation maximizes spilling edge and exposes a greater surface of the water to the stripping action of the steam
Optimized mixing plus higher steam velocity results in maximum gas removal efficiency
Genuine two-stage deaeration

An assembly technician works with power cutting machinery to cut length steel to create components at a Newterra plant in Brockville

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Technical Specifications

Water enters the preheating compartment and is heated to saturation temperature. Here, the bulk of the noncondensible gases is removed before the water enters the trays.

Heated water passes through the water seal-type distributors to the tray section. The water seals prevent bypassing of steam into the preheating compartment and prevent non-condensible gases from entering the tray compartment from the preheating section. Water passes downward through the trays to complete final deaeration and then goes to storage. Steam enters the inlet nozzle and passes through ports in the tray compartment to the space above the trays, flowing downward with the water through the tray section.

This action provides highly efficient distribution over the trays, maximizing surface contact between steam and water, and prevents damming up of water and possible water hammer. Practically no steam condensation occurs in the tray compartment since inlet water has been heated to within a few degrees of steam temperature in the preheater compartment.

The entire volume of uncontaminated steam is employed in the scrubbing action, thus removing the final traces of oxygen. Steam leaves the bottom of the trays, then flows to the preheater compartment, where it is condensed. Noncondensible gases are discharged into the atmosphere.