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Re: Vacuum Evaporator - 3100 lbs/hr For Sale

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3100 lbs/hr Vacuum Evaporator

Two (2) Single effect forced circulation evaporators both mounted on the same skid, each evaporating 1554 lbs/hr (total of 3108 lbs/hr) from plating shop effluent.

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THEORY OF OPERATION:  The function of this two body single effect evaporator is to evaporate 1554 lbs/hr of water in each body (total of 3108 lbs/hr) from a plating shop effluent.  This evaporator is a specialized type of heat transfer equipment. Each evaporator body (effect) consists of a tubular heat exchanger which is used to transfer heat from condensing steam or vapor on the outside of the tubes to the liquor being evaporated on the inside of the tubes.

EQUIPMENT DESCRIPTION: The Enders' Evaporator employed for The Naval Aviation Depot at Pensacola, Florida is a Two (2) Body Single Effect Forced  Circulation Horizontal Tube.  Each effect consist of a vapor head with mesh pad entrainment separator, forced circulation horizontal type heating element, circulation pump, surface condenser, vapor piping, liquor piping recirculation liquor piping, condensate piping, condensate pump, vent piping & discharge pump. One vacuum pump serves both effects.

VAPOR HEADS: Vapor Head A, and Vapor Head B are constructed of T-316L stainless steel with tangential inlet liquor nozzle. They are designed to operate at a pressure of 5.99 psia (a vacuum) which is equivalent to a water boiling point of 170oF.  Both vapor heads are Thirty inches (30") in diameter with a straight side of nine feet (9').  Each is equipped with a mesh pad type entrainment separator with water wash system. Mesh pads are accessible by unbolting the top cover.  Vapor heads are designed to separate circulating liquor from water vapor generated in the heating element.  Water vapor and liquor enter the vapor head tangentially where the two, by cyclonic action, are separated.  Water vapor is further separated from entrained liquor by gravity as both flow up the vapor head toward the entrainment separator where essentially all remaining entrained liquor is separated.

HEATING ELEMENTS: Heating Element "A" and Heating Element "B" each are horizontal forced circulation and have 220  3/4" O.D.by 18 gauge average wall T-316L stainless steel, welded, 8 feet long tubes expanded into 1 1/8" thick, T-316L stainless steel tube sheets. This is equivalent to 346 square feet of heat transfer surface area based on the outside of tubes.  Both heating elements are designed for four (4) pass operation on the liquor side (tube side) and one (1) pass operation on the steam side (shell side) of the heat exchanger. Design liquor velocity inside the tubes is 4.8 fps.  Both shell and tube side of both heat exchangers are ASME code stamped and constructed for 75 psig pressure at 320oF. and full vacuum.  Both shells are constructed of 18", Sch 20, welded, carbon steel pipe.

RECIRCULATION PUMPS: Both recirculation pumps are designed to pump recirculation liquor at 45% total solids (55% water) 180oF & specific gravity of 1.20, from the vapor heat, through the heating element and recirculating back to the vapor head.  Pump duty is 275 gpm @ 72 feet total dynamic head with net positive suction head required of 2.5 feet.  Manufacturer is R.S. Corcoran Company of New Lenox, Illinois. Pump Model 5000F (A70-2) Size 4 x 3 FF FL with 9" impeller.  Seal is 1 3/4" type 40-D/V (Silicon Carbide vs. Tungsten Carbide, Viton elastomers & T-316 stainless steel).  Construction of T-316L & T-316 stainless steel liquor contact parts.  Pump Motor is 15 HP; 1750 RPM; TEFC; Frame 254T; 460/230 VAC; 3 ph 60 Hz.

SURFACE CONDENSERS: Surface Condenser "A" and Surface Condenser "B" each are vertical tube and have 146  3/4" O.D. by 18 gauge average wall T-316L stainless steel, welded, 5 feet long tubes expanded into 1" thick, T-316L stainless steel tube sheets.  This is equivalent to 143 square feet of heat transfer surface area based on the outside of tubes.  Both heating elements are designed for two (2)  pass operation on the cooling water side (tube side) and one (1) pass operation on the condensing vapor side (shell side) of the heat exchanger. Design cooling water velocity inside the tubes is 4.08 fps at design cooling water flow of 310 gpm. The 310 gpm figure assumes a 10oF cooling water temperature rise through the condenser. Both shell and tube side of both heat exchangers are ASME code stamped and constructed for 75 psig pressure at 320oF and full vacuum. Both shells are constructed of 14", Sch 10S, welded, T-316 stainless steel.

VAPOR PIPING (6"-VP13-S & 6"-VP14-S): Vapor piping on each evaporator is 6" Sch 10S T-316L stainless steel and channels water vapor discharging entrainment separators to their respective surface condenser.  Vapor piping is flanged at the surface condenser inlet nozzle to allow easy removal of the vapor head bolted cover.  Liquor piping for both evaporators consist of feed liquor piping and discharge liquor piping.  Flow control loops 1 & 2 including the control valve are in the feed liquor piping while the density sensor for control loops 3 & 4 as well as discharge pump P-5 and P-6 are in the discharge liquor piping (Odd numbers refer to evaporator "A" while even refer to evaporator "B"). Discharge pumps P-5 and P-6 each have an operator, which varies the flow rate through the pump in response to vapor head liquor level controller LIC-5 and LIC-6 respectively.

This system does not include the necessary boiler and cooling tower.  It has very little operating hours on it and originally sold for over 200K. The OEM is available for a fee to provide technical support and start up.  Email us and we'll send you a copy of the operating manual.  This equipment is available for viewing with scheduled appointment.  FOB: Tampa, FL "As is where is".

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