Osprey Corporation

HEAT RECOVERY SYSTEMS

Wyeth Nutritionals, Boiler Flue Gases

Commissioned in the winter of 1997 this TURBOSCRUBBER® unit simultaneously scrubs fine soot particles (product of HSFO fuel boilers), absorbs SO2 gas, and recovers waste heat. The scrubbing medium is process effluent which typically has pH 8 to 12. This effluent was originally neutralised with acid (HCl) before discharging via a biological treatment plant. The operation of the TURBOSCRUBBER® is set such that the SO2 removal from the boiler flue gases is controlled to match that required to both neutralise the process effluent (without further chemical treatment)

and maintain emission levels below legislative requirements.The unique non-clogging feature of the TURBOSCRUBBER® ensures reliable and consistent operation without any increase in gas side pressure drop.

North British Distilleries

The system is designed to control emissions (>99% SO2 and particulate removal) from two new 60,000-lb/hr dual fuel boilers, the system was designed and built to facilitate the dual fuel and also heat recovery.

The flue gases from the two boilers are ducted to heat exchangers located on the mezzanine floor at the rear of the boilers. The flue gases pass down through the exchangers to the scrubber, which is located between the boilers. Flue gases exit the top of the scrubber pass through a re-heater before being discharged to the chimney. Water from the economizers and scrubber circuit was used to pre-heat boiler feed water. The complete installation was carried out whilst the existing boilers were in operation.

Cleveland Potash, Rotary Dryer Exhaust

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Commissioned in the summer of 1995 this TURBOSCRUBBER® unit simultaneously scrubs fine KCl salt crystals (outlet from cyclones) and soot particles (product of HSFO fired dryer), absorbs SO2 gas, and recovers over 4 MW of heat energy for re-use within the process. The scrubbing medium is, normally, process slurry, having an s.g. of at least 1.35 and containing 30% un-dissolved solids. The unique non-clogging feature of the TURBOSCRUBBER® ensures reliable and consistent operation without any increase in gas side pressure drop. Sea water is used during the rare periods when process slurry is unavailable. The system is integrated with the plant process control system to ensure optimum operation. A screen shot from the control system is shown left.