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Energies 2020, 13, 6586 17 of 26 Figure 10. Alaska Chena hot spring geothermal generator set. Under the support of Chinese government, the first screw expander generating unit with the Under the support of Chinese government, the first screw expander generating unit with the capacity of 1MW, manufactured by Jiangxi HuaDian Electrical Power CO. Ltd., was put into operation capacity of 1MW, manufactured by Jiangxi HuaDian Electrical Power CO. Ltd., was put into in YaBaJing for geothermal power generation in September 2008 [67]. The screw expander generating operation in YaBaJing for geothermal power generation in September 2008 [67]. The screw expander unit produces real power of 940 kW with actual operation parameters of inlet pressure 0.36 MPa, outlet generating unit produces real power of 940 kW with actual operation parameters of inlet pressure pressure 0.09 MPa and the mixture flow rate 28 t/h. Figure 11 shows the running screw expander 0.36 MPa, outlet pressure 0.09 MPa and the mixture flow rate 28 t/h. Figure 11 shows the running generating unit with the capacity of 1MW in YangBaJing geothermal power plant. The second screw expander generating unit with the capacity of 1MW in YangBaJing geothermal power plant. screw expander generating unit with the same capacity was put into operation in October 2010. The second screw expander generating unit with the same capacity was put into operation in October This generating unit produces real power of 800 kW with operation parameters of inlet pressure 2010. This generating unit produces real power of 800 kW with operation parameters of inlet pressure 0.39 MPa, outlet pressure 0.09 MPa and the mixture flow rate 22 t/h. Figure 11 shows the second 0.39 MPa, outlet pressure 0.09 MPa and the mixture flow rate 22 t/h. Figure 11 shows the second running generating unit in YangBaJing geothermal power plant [67]. running generating unit in YangBaJing geothermal power plant [67]. Figure 11. The 1MW screw expander generating unit in YangBaJing geothermal power plant. Figure 11. The 1MW screw expander generating unit in YangBaJing geothermal power plant. The well ZK200 was drilled and completed with the depth of 606 m twenty years ago, having The well ZK200 was drilled and completed with the depth of 606 m twenty years ago, having a a total mixture flow rate of 95 t/h, a temperature of 134 ◦C and corresponding pressure of 0.26 MPa total mixture flow rate of 95 t/h, a temperature of 134 °C and corresponding pressure of 0.26 MPa at at the wellhead. In June 2011, a special recovery processing of ZK200 was conducted and a testing the wellhead. In June 2011, a special recovery processing of ZK200 was conducted and a testing full- full-flow screw expander unit of two-phase mixtures with the capacity of 400 kW, which is much flow screw expander unit of two-phase mixtures with the capacity of 400 kW, which is much more more suitable for two-phase geothermal sources, was installed at the wellhead and put into operation suitable for two-phase geothermal sources, was installed at the wellhead and put into operation in in September 2011. Figure 12 shows the running testing unit in YangYi geothermal field. After the September 2011. Figure 12 shows the running testing unit in YangYi geothermal field. After the successful running of the testing screw expander generating unit in Yangyi, another same kind of successful running of the testing screw expander generating unit in Yangyi, another same kind of generating unit with the capacity of 500 kW, which takes the container type with the function of black generating unit with the capacity of 500 kW, which takes the container type with the function of black start, was trial manufactured by Jiangxi HuaDian Electrical Power CO. Ltd. and successfully put into start, was trial manufactured by Jiangxi HuaDian Electrical Power CO. Ltd. and successfully put into operation in Yangyi in August 2012. It is becoming more convenient for transportation and installation. operation in Yangyi in August 2012. It is becoming more convenient for transportation and Figure 12 shows the testing container type of screw expander generating unit in YangYi. Energies 2020, 13, x FOR PEER REVIEW 18 of 26 installation. Figure 12 shows the testing container type of screw expander generating unit in YangYi. Figure 12. The screw generator set in Yangyi Tibet, China. (2) Application in biomass power generation As shown in Figure 13, the Buluan biomass power plant in the Philippines adopted two schemes to generate electricity by using the screw expander [65]. The first scheme: Take the temperature of 226 °C, flow of 30 t/h of saturated steam as the heat source, through the tertiary ORC screw expander power generation. In this scheme, the total installed power of the unit is 3.51 MW, and the net power generation is 2.5 MW. The second scheme: With the temperature of 115 °C, the flow rate of 4.3 t/h of saturated steam as the heat source, configure an ORC screw generator set to generate electricity. InPDF Image | Development and Application of the Twin Screw Expander
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