Rotary blowers for pressure swing adsorption process and system
AssigneePraxair Technology, Inc.
InventorsHerbert Raymond Schaub, John Harry Fassbaugh, James Smolarek, Michael Kenneth Rogan
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Abstract
The invention comprises a pressure swing adsorption process for the separation of a less adsorbable component from a mixture comprising the less adsorbable component and a more adsorbable component, the process comprising a cyclic adsorption/desorption process wherein the desorption step is at a selected pressure and occurs for a selected time such that a pressure reducing apparatus utilized to evacuate the gas does not require extraneous cooling.
Claims11
A two-bed pressure swing adsorption process for the separation of a less adsorbable component from a gas mixture comprising said less adsorbable component and a more adsorbable component, said process comprising an adsorption/desorption cycle having the following steps:
- a) introducing said gas mixture into a feed end of a vessel which contains a bed of material capable of selectively adsorbing said more adsorbable component, whereby pressure in said vessel increases;
- b) an adsorption step comprising adsorbing at least a portion of said more adsorbable component and recovering at least a portion of said less adsorbable component;
- c) a desorption step comprising desorbing said more adsorbable component from said adsorbent material by evacuation of gas from said vessel, wherein said process uses a rotary blower having a rated temperature that is less than or equal to ΔTmax, where:
- ΔTmax≦ΔTrise/t*(tALLOWED−tTOTAL+tHEAT)+ΔTrise
- wherein:
- ΔTmax=Rated temperature tolerance of said rotary blower;
- t=Time in seconds;
- ΔTrise=Rise in temperature associated with the average ΔP (inlet pressure of said rotary blower−outlet pressure of said rotary blower) of said cycle;
- tHEAT=Time said rotary blower is heated during said desorption step;
- tTOTAL=Total time of said desorption step;
- tallowed=Total cycle time for said cycle
- wherein operation of said blower at steady state conditions at the maximum ΔP (inlet pressure of said rotary blower−outlet pressure of said rotary blower) would result in blower temperatures in excess of ΔTmax.
Dependencies are inferred from the claim text.