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Most boiler manufacturers and water treatment companies recommend boiler water TDS be maintained at certain levels. The purpose of continuous blowdown is to continuously take boiler water from 4"-6" under the surface where the TDS is at its highest concentration so that it can be replaced with fresh water. While continuous blowdown is the best way in controlling these solids in the boiler the heat lost to drain over time can be a tremendous. Penn Crossover or Shell & Tube Continuous Blowdown Heat Recovery Systems can recover up to 95% of this heat normally lost. Two stages provide the recovery. The first stage uses a Penn Flash Separator where the high pressure condensate flashes to a low pressure steam use such as a feedwater heater or deaerator.
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Each Shell & Tube or Crossover system is sized individually for each application. For proper selection of a system that will insure maximum heat recovery please present the following detailed information to Penn Separator. With this information Penn can offer a system proposal based on your specific application.- Boiler Output #/hr or hp.
- Boiler Operating Pressure (psig).
- Low Pressure Use in psig.
- Percentage or Amount (gpm) of Continuous Blowdown
- Percent or Amount (gpm) Make-Up Water.
- Temperature of Make-up Water.
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Each System Comes Complete skid mounted on a channel frame with the necessary controls.
Controls Include:- Flash Separator with tangential Inlet to provide 97% quality steam to vent.
- Plate and Frame or Shell and Tube "U" tube heat exchanger.
- Externally mounted float type pneumatic level controller and control valve.
- Tubular glass water level gauge.
- Three panel mounted thermometers for makeup inlet, makeup outlet, and blowdown temperature to drain.
- Safety relief valve set to protect the system controls.
- Flash Separator bottom Cleanout Valve.
- Blue Enamel Exterior Finish.
- Shown with optional High Level Switch.
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The second area a separate heat exchanger that transfers the remaining heat to boiler Make-up water.
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