B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/22 (2006.01) B01D 53/26 (2006.01)
Patent
CA 2234776
A combination gas drying and reservoir apparatus includes a reservoir, a membrane dryer disposed inside the reservoir and a control scheme that reduces the amount of gas lost as sweep gas from the dryer. The reservoir has an inlet flange that receives moisture laden gas from a compressor, an outlet flange from which dried gas discharges to a pneumatic system and a purge flange. The dryer includes a vessel encasing a membrane unit between its inlet and outlet ends. A purge port of the vessel communicates with the purge flange to form a purge channel. The inlet end of the vessel is connected to the inlet flange from which it receives the moisture laden gas. The moisture laden gas then flows into the membrane unit. Sweep gas that has permeated through membranes flows from a sweep space defined between the vessel and the membrane unit to the purge channel. Dried gas flows out of the membrane unit through the outlet end of the vessel into the reservoir. The control scheme includes a purge valve and a mechanism for controlling the purge valve. Connected to the purge flange, the purge valve can be closed to prevent sweep gas from exhausting via the purge channel to atmosphere. When the compressor is unloaded, the mechanism closes the purge valve thereby preventing sweep gas from expelling to atmosphere. When the compressor is loaded, the mechanism opens the purge valve thereby allowing sweep gas to exhaust to atmosphere via the purge channel of the apparatus.
Macrae & Co.
Westinghouse Air Brake Company
LandOfFree
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