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Choice of ORC Technology Suppliers The field of ORC suppliers is fortunately rather wide. They include the following companies with excerpts from the literature of the company provided in quotes when available. • Rotoflow Division of Atlas-Copco Industries. “Rotoflow Inc., a pioneer of turboexpanders in natural gas applications, has designed and manufactured over 2,300 turboexpander units for natural gas, dew point control, geothermal, pressure let down, energy recovery, air separation and other applications where pressure and temperature are dropped.” • Mafi-Trench Corporation. “Mafi-Trench Corporation is the leading manufacturer of radial expansion turbines, or turbo-expanders. Mafi-Trench turboexpanders, for process and power recovery applications, are in service worldwide in industries such as cryogenic natural gas processing, petrochemicals, including ethylene, ammonia, MTBE and methanol; low temperature refrigeration, hydrogen purification; and dew point control. Unlike other manufacturers, Mafi-Trench Corporation concentrates its entire resources on the design and manufacture of turboexpanders. That focus enables Mafi- Trench to single-mindedly pursue product perfection.” • Barber-Nichols. Barber-Nichols (Appendix C) designs and manufactures custom steam, gas and hydraulic turbines for almost any service. We have an extensive background in design and manufacture of highly efficient Rankine Cycle engines for unique applications. We have designed and manufactured turbines that operate at speeds from 2,000 to 130,000 RPM and power levels up to 6 MWe. • Ormat. “Since 1965, ORMAT power solutions have combined ecology with economy to produce environmentally sound energy systems that make business sense. The revolutionary ORMAT® Energy Converter is today the basis for dozens of geothermal power plants ranging from 300 kWe to over 130 MWe. Other innovative ORMAT applications include the production of power from industrial waste heat, solar energy, and low-grade fuels, and powering unattended telecommunication repeaters and cathodic protection systems.” • Exergy. Exergy is a company dedicated to the development of the Kalina Cycle that combines and separates steam and ammonia in a manner that allows recovery of energy at low-temperatures. The Kalina cycle does not have a proven track record to the extent of the other suppliers; nevertheless, it does address the issue of recovering energy at low temperatures and is included here. This study focused on the process design, to find a means to maximize output and keep power costs to a minimum. The study was not intended to perform a rigorous selection between the potential suppliers. Bibb and Co., the engineering subcontractor on this project, has worked with all the above manufacturers or developers and is well positioned to evaluate the strengths of each relative to the STORES power plant. Each of the above suppliers is a potential candidate for part or all of the turbines needed for the selected cycles, and will be considered. The Solar Field For this study, it was decided to use a solar field with elements similar to those used at SEGS 3 through 6. The basic building block is the LS2 heat Solar Collector Assembly (SCA). For an overall efficiency of 25%, and an output of 10 megawatts net, the total mirror surface required is 63,000 square meters. The capacity factor used was the same as the capacity factor for the “no- storage” case, approximately 27%. Each SCA has a length of 47.1 meters and a width of 5 meters B-12PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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