Water Jet Eductor Scrubbers

Series 770 Water Jet Scrubbers

HEIL Series 770 Water Jet scrubbers, also known as eductors, are designed for the removal of soluble gases and particulate matter, and direct-contact condensation. The open design combined with a high liquid flow-rate permits collection of sticky and/or gummy particulate, as well as gas, which decomposes upon contact with water, e.g. SiCl₄, H₂SiF₆.

A high liquid flow at pressures up to 100 psig directed into the throat of the venture induces a gas flow into the venturi. Gas/liquid contact occurs in the throat of the venturi where the contaminant gas or particulate matter is scrubbed. Leaving the throat, the gas expands in the venturi’s diverging section on its way to the separator tank. Once in the separator tank, the gas stream makes several sharp changes in direction, causing entrained water droplets to impinge on the tank wall or the liquid surface. The scrubbed gas then exits the separator and exhausts in the atmosphere. There are a series of water jet scrubbers to address a range of extremely high efficiency requirements. 

The standard series 770 Water Jet Scrubbers are custom designed to meet the specific requirements of each application.

Control Epitaxial Reactor Exhausts

Series 770 Applications

HEIL Series 770 Water Jet Scrubbers have been used successfully for the control of corrosive and/or noxious gases and particulate matter in fertilizer, pulp and paper, pharmaceuticals, and chemical plants.

The design of the series 770 Water Jet Scrubber makes it the ideal choice for the control of epitaxial reactor exhausts. The scrubber is selected to provide adequate dilution (up to 100:1) of the incoming gas. The high liquid flow deluges the incoming gas, trapping most of the silicon dioxide (a decomposition product of SiCl₄) while also absorbing the HCL gas. Two series 770 Water Jets have shown in testing to achieve efficiency in excess of 98%.

High Efficiency, Low Cost Scrubbers

Principal features of series 770 Water Jet Scrubber:

Low initial cost – The series 770 Water Jet is capable of inducing gas flows up to 95,000 CFM against static resistances up to 8 inches wc without using a fan. Pre-engineered standard designs are available over the range of capacities.

Low maintenance costs – All internal parts are stationary. Without regular friction, those parts do not wear. The spray nozzles used to direct spray to the throat have large orifices to eliminate the potential for plugging. The open design makes series 770 Water Jet Scrubbers highly effective at controlling heavy solids loadings, as well as sticky or tacky materials that clog other scrubbers.

High-efficiency – Proper sizing of the unit and selection of irrigation rate, pressure, and chemical addition will result in efficiencies up to 90 percent for soluble gases for a single series 770 Water Jet. Particulate collection efficiency can exceed 99 percent.

Versatile – The series 770 Water Jet Scrubber can be specified for a wide variety of gas scrubbing applications. In addition, they can be operated in series with another series 770 Water Jet or other type scrubbers, like series 730 Countercurrent Scrubber, to achieve maximum efficiencies even for the most difficult applications.

Extended Service Life – Individual units are designed with maximum corrosion resistance as a primary consideration. The wide selection of corrosion resistant material feature rigidon FRP (fiber reinforced polymer) as a standard material, with stainless steel and other alloy constructions available.

Series 770 Equipment Selection

The air or gas volume required to ventilate the process is the principal guide for selecting the proper sized scrubber. Where the specific volume of air required is not already known, reference materials such as the Industrial Ventilation Handbook (ACGIH) should be consulted.

After determining the total air volume to be scrubbed, the efficiency of the unit must then be selected. The required efficiency will depend on several factors, including the type of particulate, solubility, size distribution, density/specific gravity, quantity, concentration, plant environment, and local, state and federal codes.