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generation is about 15 million degrees, and the economic and social benefits are all considerable [66]. 3.1.2. The Application of Screw Expander in Industrial Waste Heat Recovery In China, the total resources of industrial waste heat accounts for 17%–67% of fuel consumption, Eanedrgitehs e20r2e0c, 1y3c,l6a5b8l6e part accounts for about 60% of the total residual heat. Therefore, China has a16gorfe2a6t potential for waste heat application. The screw expander can directly or indirectly generate electric energy by using the industrial hot water, hot oil, atmospheric steam, waste gas and combustible energy by using the industrial hot water, hot oil, atmospheric steam, waste gas and combustible waste waste gas. Especially, the ORC screw expansion unit is widely used in industrial waste heat recovery. gas. Especially, the ORC screw expansion unit is widely used in industrial waste heat recovery. China petroleum and chemical corporation, Beijing Yanshan branch (Figure 9), adopts the China petroleum and chemical corporation, Beijing Yanshan branch (Figure 9), adopts the single-stage single-stage ORC expansion power generation scheme [65]. In this scheme, the hot oil with a ORC expansion power generation scheme [65]. In this scheme, the hot oil with a temperature of 135 ◦C temperature of 135 °C and a flow of 125 t/h is directly introduced into evaporator and preheater. In and a flow of 125 t/h is directly introduced into evaporator and preheater. In the evaporator, hot oil and the evaporator, hot oil and organic medium are heat exchange to produce high-pressure and high- organic medium are heat exchange to produce high-pressure and high-temperature organic vapors, temperature organic vapors, which drive the expander to rotate, thus driving the generator to which drive the expander to rotate, thus driving the generator to generate electricity. The total installed generate electricity. The total installed power capacity of screw expander generator set is 900 KW, power capacity of screw expander generator set is 900 KW, and the annual net power capacity is and the annual net power capacity is 4.73 million KW, which can save 1656 tons of standard coal, and 4.73 million KW, which can save 1656 tons of standard coal, and reduce CO2 emissions by 3934 tons. reduce CO2 emissions by 3934 tons. Figure 9. The screw expanding power generator of China petroleum and chemical corporation, Beijing Figure 9. The screw expanding power generator of China petroleum and chemical corporation, Yanshan branch. Beijing Yanshan branch. 3.1.3. The Application of Screw Expander in Renewable Energy Generation 3.1.3. The Application of Screw Expander in Renewable Energy Generation With the continuous improvement of screw expander technology, the screw expander has been With the continuous improvement of screw expander technology, the screw expander has been widely used in renewable energy generation fields such as geothermal power generation and biomass widely used in renewable energy generation fields such as geothermal power generation and biomass power generation. A typical example of the application of screw expander in the new energy power power generation. A typical example of the application of screw expander in the new energy power generation is briefly introduced below. generation is briefly introduced below. (1) The Application in the Geothermal Power Generation (1) The Application in the Geothermal Power Generation As shown in Figure 10, The Alaska Chena hot spring geothermal power generation unit adopts As shown in Figure 10, The Alaska Chena hot spring geothermal power generation unit adopts the the single stage ORC expansion power generation scheme [65]. The description of the scheme is as single stage ORC expansion power generation scheme [65]. The description of the scheme is as follows: follows: Firstly, the hot water at 82 °C is directly poured the evaporator and preheater of the ORC Firstly, the hot water at 82 ◦C is directly poured the evaporator and preheater of the ORC power power generation system. Then, the hot water exchanges heat with the organic working medium generation system. Then, the hot water exchanges heat with the organic working medium (R245fa) (R245fa) in the evaporator to form high-pressure, high-heat organic vapor. In the end, high- in the evaporator to form high-pressure, high-heat organic vapor. In the end, high-temperature and temperature and high-pressure organic steam drive expander work to produce electricity. The total high-pressure organic steam drive expander work to produce electricity. The total installed capacity of installed capacity of the screw generator unit is 400 KW, and the net generating capacity is 312 KW. tEhnergsicerse2w020g, e13n,exrFaOtoRrPuEnEiRt RisEV40IE0WKW, and the net generating capacity is 312 KW. 17 of 26 Figure 10. Alaska Chena hot spring geothermal generator set. Figure 10. Alaska Chena hot spring geothermal generator set. 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 in YaBaJing for geothermal power generation in September 2008 [67]. The screw expander generating unit produces real power of 940 kW with actual operation parameters of inlet pressure 0.36 MPa, outlet pressure 0.09 MPa and the mixture flow rate 28 t/h. Figure 11 shows the runningPDF Image | Development and Application of the Twin Screw Expander
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