How the EVAPORATIVE TANK ™ Works

http://www.poly-products.com/how.htm The EVAPORATIVE TANK ™ is available in four models; the ET-II and the ET-III are designed to recover chemicals (dragout) from rinse water.
The ET-II-W and ET-III-W are ideally suited for dewatering spent solutions or wastewaters that may have a high solids content.

Pumped solution is circulated at a high rate from your process tank or reservoir up to the ET-II-W or ET-III-W and is drained back by gravity to your tank. In the evaporator, the solution is sprayed onto 700 or 1,000 square feet of evaporative panels to humidify the blower air that is forced through these panels. The humid air is then ducted to the outdoors. Heat for evaporation is taken from the solution pumped through the evaporator(about 9,000 BTU per gallon of evaporation.) The "triple-effect", proprietary mist eliminator reduces any droplet emissions to a very low level. An optional AirScrubber™ can be installed inside the EVAPORATIVE TANK™ at any time to further reduce emissions to meet most stringent regulations.
The ET-III-W or the ET-II-W depends on a high flow rate and large solution drops suspended in the air stream for its extensive evaporative surface. The 1/2" passages in the spray nozzles make the ET-III-W ideal for waste minimization. The ET-II-W is a smaller version of the ET-III-W and uses a flow rate of 20 to 25gpm.

How The Evaporator Tank™ Works

Ball Valve
Evaporative Panels (ET II & ET III only)
Drain
Deflector Panel
Mist Eliminator


The chart at right is based on evaporating pure water at 0% relative humidity, As the impurities in the water increase, there is less water available to evaporate; your evaporation rate will decrease. As relative humidity increases, the evaporation rate of the solution at ambient temperature decreases. As solution temperature increases, the effect of relative humidity on the evaporation rate decreases. Temperature does not dictate evaporation rate ... BTU input does (9,000 BTU's or 2.6 KWH per gallon is needed to maintain solution temp.). This graph shows the maximum evaporation rates you can expect. Every application is unique, and solutions are not pure water at 0% relative humidity.
Pat. # 4790904

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