Organic Rankine Cycle (ORC) systems are not new; prototypes have been tested for about a century. The theoretical investigation and practical applications in the past are briefly presented and referenced. This paper presents the applications of this technology, which matured mainly in geothermal applications, to the recovery of exhaust heat of simple cycle gas turbines driving compressors on gas pipelines and gas processing plant. Most of the compressor stations have a capacity below 50 MW and operate basically unattended. The complexity and the necessity of an operator prevents the use of bottoming steam systems (combined cycle) on this size of plant. In these applications, which are mainly retrofits, the ease of operation of the ORC made its use possible where steam turbines were unsuccessful. Two applications are described: the Enterprise Products’ Neptune plant in Louisiana, and the Gold Creek gas compressor station in Alberta, Canada.

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