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Type 620, 622, and 626 Gas Jet Compressors
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| OPERATION |
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Gas jet compressors utilize high pressure
motive fluids such as steam, air, or other gas to entrain lower
pressure steam, air, or other gas. The motive fluid passes
through a custom designed nozzle. It exits the nozzle at a
high velocity as the pressure energy is converted to kinetic
energy. Momentum present in the motive fluid is transferred
to the suction fluid as the two fluids mix in the body of the
compressor. The gases exit the venturi tail at a pressure intermediate
to the suction and motive pressures.
The Type 620 Barstock Compressor and the Type 622 Fabricated Compressor
are fixed nozzle gas jet compressors which can be used in both critical
and sub?critical compressing applications. The Type 626 Variable Spindle
Gas Jet Compressor can be used only in sub?critical compressing applications.
The Type 626 Variable Spindle Gas Jet Compressor is suitable in applications
with a large variation in conditions, such as those encountered in
waste steam recovery. The Type 626 Compressor is equipped with an actuator
that adjusts a spindle. The spindle moves in and out of the motive
nozzle, varying the effective nozzle area and the resulting motive
gas flow rate. The actuator is typically adjusted from a controller
mounted downstream of the jet compressor. The controller usually senses
pressure or temperature and adjusts the motive flow rate to meet the
system performance requirements.
The term "thermocompressor" is applied to a gas
jet compressor utilizing motive steam to entrain and compress
suction steam.
Gas jet compressor performance is determined largely by the energy available
in the motive fluid. Actual performance depends on the operating conditions
of
particular application. Entrainment and compression are inversely related.
ES, factory engineers are available to assist in sizing.
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| APPLICATION |
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Gas jet compressors can be used wherever a higher
pressure gas, air, or steam source is available. Compressors
are especially useful in recovering waste steam with higher
pressure makeup steam. Thermocompressors have lower initial
and maintenance costs than mechanical compressors. Typical
applications for gas jet compressors include boosting the pressure
of low pressure waste steam or waste gas, gas compressing,
and natural gas mixing stations.
A large number of applications utilize motive steam for
steam recovery and gas mixing. Typical equipment for which
steam is recovered includes paper and textile drum dryers,
evaporators, heaters, kilns, and vulcanizers.
The chemical, pharmaceutical, petrochemical, pulp and paper, and power
industries have all successfully utilized gas jet compressors.
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| CONSTRUCTION |
| The gas jet compressor is available in a variety
of construction materials, including carbon steel, stainless
steel, Monel, Hastelloy, titanium and Teflon. Smaller compressors
are machined from bar while larger sizes are fabricated from
plate. The motive nozzle and venturi tail are custom designed
for the application. Connections are typically threaded or flanged,
but special connections can be provided |
| Related Links: |
| Type
620, 622, and 626 Gas Jet Compressors - Dimensions |
| Type
620 and 622 Fixed Nozzle Gas Jet Compressors - Installation |
| Type
626 Variable Spindle Thermocompressor - Installation |
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