Enders' Gas Fired Tank Evaporator operating at Citation Corp. (Formally ITM Corp); Grand Rapids Michigan, since 1997. Design evaporation rate is 250 GPH (with clean hot tube). In spite of very dirty feed the evaporator is cleaned only once a week. Client reports sludge layer on the 8" diameter hot tube is typically 3" thick when shut down for cleaning demonstrating rugged evaporator construction. Oil accumulates on the hot liquid surface and is periodically skimmed off as required.

Tank evaporators boil off water from waste water for volume reduction, from maple syrup for concentration and from the reverse osmosis machine reject for chemical recovery. They consist of a "hot tube" submerged in a boiling solution providing heat transfer area for evaporation. Tube heat is maintained by a burner mounted on one end of the tube. Industries that generate dilute waste, find that the best way to dispose of it is treatment off site by others. But, most don't realize how cost effect it is to reduce the volume of their waste in a Tank Evaporator before it is hauled.

Currently it cost about $.05/gallon, to boil off water from waste for natural gas consumption in an Enders Tank Evaporator. Waste haulers charge $0.35/gallon and up to haul off that same water. A difference of $.30/gallon. Payout time in most cases is between 8 and 16 months.

Enders' single effect tank evaporators operate at atmospheric pressure and consequently cost of construction is low. We also offer Double Effect Tank Evaporators which will provide approximately 80% more evaporation per BTU input. The first effect is a round horizontal pressure tank which delivers water vapor to the second effect steam chest where it gives up heat by condensing. This heat is adsorbed by second effect waste water to boil off more water there.

Capacity of Enders' tank evaporators goes up from 10 GPH. Motive energy can be natural gas, fuel oil, steam, electric and even waste heat. Stands are available to elevate the evaporator high enough to discharge sludge into a drum by gravity.

We do not flow sweep air over the boiling surface in our evaporators saving the expense of heating this air to 212^oF(not only in the evaporator but in the make-up room air heater as well). The savings are large particularly for continuous cold winter operation. Sweep air also increases vapor velocity in the vapor chamber to entrain more aerosols of boiling liquid.

The Enders' tank evaporator can condense the water vapor since it is separated from the flue gas and since there is no sweep air mixed with it a diverter valve is available to send water vapor either outside or to the condenser. This not only incorporates the two cost saving features of no sweep air but it now allows incineration of odors given off from the boiling liquor and you get distilled water to boot. Vent gas (containing odors) from the condenser can flow to the gas/oil fired burner via the combustion air fan, where it is incinerated.

Any material of construction is available. Since vessel wall temperature is no hotter than the boiling liquid inside. We can also offer as a cost saving option, coated carbon steel tank walls the hot tube cannot be coated.