Low Cost, Maintenance-Free Way to Compress and Mix Gases or Vapors
JET-VAC® Technologies Thermocompressors use a jet of high-pressure media to entrain a low-pressure gas or vapor. Mixing the two and discharging the mix at an intermediate pressure, fluids can be steam, air, propane or any other vapor phase material. When both vapors are steam, the compressor is referred to as a thermocompressor.
- Simple construction with no moving parts
- Low cost and upkeep
- Intrinsically safe for potentially explosive environments (excluding instrument transmitters)
- Low maintenance requirements allow use in remote locations
- Available in a variety of materials – cast iron, Hastelloy™ and others
How Thermocompressors Work
Motive steam, under pressure, enters the thermocompressor and flows through its nozzle. The nozzle converts the high-pressure vapor, into a high-velocity stream, creating suction and causing entrainment of the low-pressure steam. The two vapors mix in the thermocompressor body and the diffuser then converts the velocity head of mixture into a static head to obtain the proper discharge pressure.
Thermocompressor designs are classified based on the fluid velocity in the throat of the diffuser. When the velocity is supersonic, the design is identified as critical. This is based on performance requirements.
These have an absolute discharge pressure of less than 1.8 times the absolute suction pressure for steam as the motive fluid. Constant suction pressure is maintained at varying capacities, by controlling the motive flow.
These have an absolute discharge pressure equal or greater than 1.8 times absolute suction pressure. The motive fluid cannot control the suction pressure. It is necessary to add a secondary suction fluid or vary the suction pressure, by introducing an artificial pressure drop, in the suction lines.