Portable pressure swing adsorption system and method for fuel gas conditioning

A fuel gas conditioning method, comprising:

• connecting a fuel gas conditioning system to a compressed rich gas stream, wherein the fuel gas conditioning system comprises a pressure swing adsorption (PSA) system;
• heating at least a portion of the compressed rich gas stream to at least 100° C.;
• accepting the heated at least the portion of the compressed rich gas stream as feed gas into the fuel gas conditioning system;
• flowing the feed gas through the PSA system, wherein an adsorbent bed of the PSA system adsorbs at least a portion of ethane-plus (C2+) hydrocarbons from the feed gas to produce a high-quality fuel gas;
• fluidly coupling the high-quality fuel gas to a fuel line;
• adiabatically at at least 100° C., lowering the pressure of the adsorbent bed to desorb the at least a portion of C2+ hydrocarbons, wherein the portion of C2+ hydrocarbons so desorbed are in gaseous form;
• and
• returning the gaseous at least a portion of C2+ hydrocarbons to one of the compressed rich gas stream, a raw gas stream or a gas gathering system.