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Energies 2020, 13, x FOR PEER REVIEW 21 of 26 Brayton cycle method [80–82]. Among them, direct expansion method and secondary media method although are of lower efficiency, but the principle simple, applicability, less restrictive conditions, Energies 2020, 13, 6586 21 of 26 and it are worth promoting. The operating principles of these two methods are shown in Figure 17 [82]. (a) (b) Figure 17. Liquefied Natural Gas (LNG) power generation schematic diagram: (a) direct expansion Figure 17. Liquefied Natural Gas (LNG) power generation schematic diagram: (a) direct expansion method; (b) secondary media method. method; (b) secondary media method. The reserves of solar energy, ocean thermal energy, and LNG cold energy are huge, but the utilizationrraatteeisisexetxrtermemeleylyinienffeifficiecnietn, st,ositohiatshgarseagtrpeaotepnotitaelnftoiarldfeovreldoepvmeleonptmanedntuatinlidzautitoilniz.aAtfiotenr. Adeftcearddesecoadfedseovfedloepvmeleonptm,ethnet,tlhowel-otewm-tpeemrapteurraetupreowpoewregrengenraetriaotniontectehcnhonlolgoygyhhasasbbeeennrelatively mature and hassbbeeennaasusuccecsesfsuful al paplpicliactaiotinontottohethseolsaorlaernerngeyr,goyc,eoacnetahnertmhearlmenael regnyercgoynvceornsivoenrsainodn aLnNdGLNpoGwpeorwgerngereanteiorant.ioTnh.eThscersecwreewxpexapnadnedrehrahsaas gargeraetaatdadvavnantatgageeccoomppaarreeddwiitthtthetraditional steam turbine, which can be used to replace the turbo expander in the medium and low-temperature power generation system. Therefore, the screw expander will have great potential in the ffiield of solar energy,, ocean thermall energyconverrsiionandLNGccolldenerrgygeeneerraattiion.. 4. Conclusions 4. Conclusions This paper mainly introduces the development and application of the screw expander. This paper This paper mainly introduces the development and application of the screw expander. This classified, inducted and summarized the research status of the leakage, rotor geometry, manufacturing paper classified, inducted and summarized the research status of the leakage, rotor geometry, and lubrication that affect the performance of the screw expander. manufacturing and lubrication that affect the performance of the screw expander. As for the leakage problem of screw expander, some scholars make use of new theory (ICCAD/TCA) As for the leakage problem of screw expander, some scholars make use of new theory or adopt experimental methods to analyze and study it. With the development of computer application (ICCAD/TCA) or adopt experimental methods to analyze and study it. With the development of in recent years, many scholars have carried out analysis and research by using computer-aided design. computer application in recent years, many scholars have carried out analysis and research by using For example, SCCAD software was used to study the leakage characteristics of the screw expander, computer-aided design. For example, SCCAD software was used to study the leakage characteristics and CFD simulation analysis was carried out based on the model established by PROE. Most studies of the screw expander, and CFD simulation analysis was carried out based on the model established on working medium leakage are based on single-phase gas or single-phase liquid analysis. In order to by PROE. Most studies on working medium leakage are based on single-phase gas or single-phase be close to the real working situation, many scholars conduct research and analysis by establishing liquid analysis. In order to be close to the real working situation, many scholars conduct research and models and making a series of assumptions about the working medium. The rotor profile directly analysis by establishing models and making a series of assumptions about the working medium. The determines the geometric parameters, which decide the size of the leakage, such as the leakage rotor profile directly determines the geometric parameters, which decide the size of the leakage, such triangle and the contact line length, etc. Therefore, the rotor profile determines the performance of as the leakage triangle and the contact line length, etc. Therefore, the rotor profile determines the the screw expander to a large extent. Many scholars apply new methods, new thoughts and new performance of the screw expander to a large extent. Many scholars apply new methods, new tools for optimization and redesign of the rotor profile. Recently, computer technology is playing thoughts and new tools for optimization and redesign of the rotor profile. Recently, computer an important role in the optimization of the typical profile and the development of the new profile. technology is playing an important role in the optimization of the typical profile and the development The rotor profile is designed by using the ‘mutual engagement principle of Gear’ theory, SCCAD of the new profile. The rotor profile is designed by using the ‘mutual engagement principle of Gear’ software, inverse design or other methods. Processing accuracy of the screw rotor has a significant theory, SCCAD software, inverse design or other methods. Processing accuracy of the screw rotor influence on the leakage gap, seal, friction of the screw mechanism. The requirement of screw rotor has a significant influence on the leakage gap, seal, friction of the screw mechanism. The requirement for machining accuracy is high. With the development of the CNC machine technology, professional of screw rotor for machining accuracy is high. With the development of the CNC machine technology, screw rotor processing equipment has successfully been developed, and corresponding new screw professional screw rotor processing equipment has successfully been developed, and corresponding processing methods have been proposed, so the accuracy and performance of the screw rotors obtained new screw processing methods have been proposed, so the accuracy and performance of the screw the significant enhancement. The grinding method not only has high machining efficiency but also rotors obtained the significant enhancement. The grinding method not only has high machining makes the rotor have a higher precision of tooth surface. The forming milling method can meet efficiency but also makes the rotor have a higher precision of tooth surface. The forming milling the requirements of both efficiency and machining accuracy and is the most common method of the manufacturing process of the rotor. The sealing component is a critical part of the screw expander,PDF Image | Development and Application of the Twin Screw Expander
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