The Fluor Cryo-Gas process for natural gas liquids (NGL) recovery is a complete portfolio of patented or patent pending turbo-expander-based NGL recovery processes. It is tailored to meet a wide variety of feed gases and NGL recovery requirements. Description: The Cryo-Gas process presented in the diagram is the vapor reflux absorption process (VRAP). VRAP is a two column process that can achieve 99.9% propane recovery without external refrigeration. It features low capital cost, weight and footprint and has low energy and utility requirements.
Four additional Fluor Cryo-Gas process schemes are: Fluor’s patent pending two columns, high-pressure absorber process (TCHAP) is the most energy efficient NGL recovery process for feed gas pressures exceeding 1,000 psig. TCHAP achieves up to 85% ethane recovery with propane recovery in excess of 99%. Alternately, the process can achieve propane recoveries exceeding 99% while rejecting ethane. It is resistant to carbon dioxide (CO2) freezing and requires 30% less residue gas compression hp than competing processes. TCHAP can produce product quality ethane with <500 ppmv CO2 without treating. The stabilizer expander process (STEP) is specifically designed for rich feed gases that also vary in composition over time. STEP is capable of 88% ethane recovery with 97% propane recovery. It also has a high C2 and C3 recovery under a wide variation of feed gas compositions. The twin-reflux absorption process (TRAP) achieves greater than 90% ethane recovery with more than 99% propane recovery. It is ideal for revamping existing NGL plants. The process can completely reject ethane without loss in propane recovery. TRAP can also be used for ethane recovery at feed pressures as low as 300 psig. When used in an existing plant retrofit, TRAP usually does not require re-wheeling the existing turbo-expander. The subcooled absorption reflux process (SARP) is designed for rich feed gases with a high CO2 content. SARP can achieve ethane recoveries exceeding 90% with propane recoveries of more than 99%. SARP minimizes CO2 removal requirements and freezing problems while maintaining ethane recovery exceeding 90%. Licensor: Fluor Enterprises, Inc.