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The following solutions were utilized to increase inlet pressure to the microturbine: (A) Capstone-developed rotary flow compressor. The compressor increased flow to the Capstone system inlet but could not be used on a production basis due to the short life of critical bearings. Capstone now offers a compressor model with air bearings. The new model is designed for NG and cannot be used in its current configuration for LP Gas due to LP Gas’s higher energy density. (B) Superior Gas Plants gas-fired vaporiser. This system is a water-glycol vaporiser utilizing a 24-volt liquid fuel pump. The vaporiser does not require additional electrical power and has very low pump power requirements (85 watts). The vaporiser works well to increase the LP Gas flow to the microturbine. The vaporiser cost of $5,000+ is prohibitive to some end users. However, it is the only known solution to reliably increase LP Gas pressure on a production basis in cold weather. NG wellhead pressure is only 1-2 psig, far below the Capstone requirement of 52 psig. This requires the use of a NG compressor prior to the Capstone system. For most of the year the LP Gas delivered to the turbine injectors does not require a boost in pressure. Such boost is needed only in the coldest months. Whenever the fuel source of the microturbine is changed from LP Gas to NG (or vice versa) a hardware change is required. This hardware change requires physically removing the Capstone Smart Proportioning Valve and installing the NG compressor. This fuel system modification is reported to be relatively complex and takes approximately three hours. The switch from LP Gas to NG is even more difficult in cold weather because the vaporiser must also be removed before installing the compressor. 15PDF Image | Glotec Global Technology Network LP Gas Use in Microturbine Applications
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