Development and Application of the Twin Screw Expander

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Development and Application of the Twin Screw Expander ( development-and-application-twin-screw-expander )

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energies Review Overview of the Development and Application of the Twin Screw Expander Junying Wei 1, Qi Hua 1, Jidai Wang 1,*, Zheng Jiang 1, Jihong Wang 2,* and Liang Yuan 3 1 2 3 * Correspondence: djdwang8911@sina.com (J.W.); jihong.wang@warwick.ac.uk (J.W.); Tel.: +86-158-5420-2209 (J.W.); +44-76-7821-7762 (J.W.) Received: 16 November 2020; Accepted: 8 December 2020; Published: 14 December 2020 College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China; jdwjy0726@163.com (J.W.); bzxyhq@163.com (Q.H.); jiangz1022@163.com (Z.J.) School of Engineering, University of Warwick, West Midlands, Coventry CV47AL, UK College of Mechanical Engineering, Xinjiang University, Ürümqi 830046, China; ylhap@163.com Abstract: With the development of society, the energy crisis has become increasingly prominent, which greatly affects the sustainable development of the economy of various countries. Industrial energy consumption accounts for more than 70% of China’s total energy consumption, of which more than 50% is converted to industrial waste heat, and recyclable waste heat resources account for about 60% of the total waste heat resources, while China’s current utilization rate of industrial waste heat only reaches about 30%. The development of renewable energy and recovery of low-grade waste heat in industry is the key to solve the problem. As a type of volumetric expander with full flow expansion, the screw expander is extensively applied in the industrial waste heat recovery and geothermal energy generation industry because of its effective utilization of low enthalpy energy. Improving the performance of the screw expander as the core, the paper concludes and summarizes the research status of the leakage, rotor geometry, sealing and lubrication, processing and manufacturing, which can affect the performance of the screw expander. In addition, it also introduces the application status and potential utilization of screw expander. Keywords: screw expander; performance; research status; application status 1. Introduction Since the industrial revolution, fossil fuels such as oil and coal have become the foundation of social development. But with the development of the economy, the current reserves of fossil energy are difficult to meet the demand. Therefore, countries around the world have vigorously developed solar, geothermal and other renewable energy, and have carried out energy conservation work. Industrial energy consumption accounts for more than 70% of China’s total energy consumption, of which more than 50% is converted to industrial waste heat, and recyclable waste heat resources account for about 60% of the total waste heat resources, while China’s current utilization rate of industrial waste heat only reaches about 30% [1]. Table 1 shows the heat sources of industrial waste heat and the percentage of fuel consumption in various industries [2]. In the metallurgical industry, the waste heat resources mainly come from rolling steel heating furnace, soaking pit, open hearth furnace and blast furnace, etc., which accounts for more than 33% of the fuel consumption. In the chemical industry, waste heat resources mainly come from chemical reaction heat and combustible chemical heat, etc., which accounts for more than 15% of fuel consumption. In the building materials industry, waste heat resources mainly come from high-temperature flue gas, kiln crow cooling and high temperature products, etc., which accounts for about 40% of fuel consumption. In the glass industry, waste heat resources mainly come from glass melter, enameling furnace and pot furnace, 􏰁􏰂􏰃 􏰅􏰆􏰇 􏰈􏰉􏰊􏰋􏰌􏰂􏰍 Energies 2020, 13, 6586; doi:10.3390/en13246586 www.mdpi.com/journal/energies

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