This is a simple drawing of a pulse combustion spray dryer. It has a novel design and performance when compared with conventional Spray Dryers. This new design allows the product to be in contact with heat a very short time, at lower temperature, and uses less fuel (gas) to do the job. These dryers are designed and built by Pulse Combustion Systems LLC. of California (32, 73, 111, 113, 195, 226). www.pulsedry.com
To the right is a Pilot Scale Pulse Combustion Spray Dryer used for scale-up and materials testing purposes. At center is a variable speed Moyno Pump (progressive cavity) for feeding viscous product, from an agitated tank, through a Micro Motion D25 Mass Flow Sensor, and then into a cooling water jacketed inlet port of the dryer. The product is kept cool until it reaches the internal nozzle tip where high frequency sonic bursts of hot gas disperses it in a few microseconds to microns in size. It immediately cools by releasing its water vapor in a slight negative pressure environment. The dried product powder is then drawn down and out through a series of cyclones, and removed to a cool container by a rotary airtight valve.
This system utilizes the Fisher-Rosemount RS3 Process Control System. Parameters monitored and controlled include: Temperature at 8 different points, percent diluent air, percent combustion air, percent exhaust air, natural gas flow rate, vessel pressure, product feed rate, product feed density, product feed temperature, combustion rotor speed, pulse frequency, and flame intensity (32, 73, 111, 113, 195, 226).
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