Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (4): 84-90.doi: 10.6040/j.issn.1672-3961.0.2020.267

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Operating characteristics of oil-free twin-screw air compressor

LI Peng1,2, LIU Zhaoqiang1, YANG Fengling2,3*, LIU Xin2   

  1. 1. Tengzhou Cigarette Factory, China Tobacco Shandong Industrial Co., Ltd., Tengzhou 277599, Shandong, China;
    2. School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China;
    3. Key Laboratory of High-Efficiency and Clean Mechanical Manufacture of Ministry of Education(Shandong University), Jinan 250061, Shandong, China
  • Published:2021-08-18

Abstract: In order to improve the operating efficiency of the oil-free twin-screw air compressor, the operating characteristics of the compressor were studied. Polytropic exponent, optimal intermediate pressure, exhausted-air pressure and temperature of the oil-free twin-screw air compressor during the operating processes were systematically studied. The theoretical analyses and experimental measurements were carried out. Results showed that the first-stage compression polytropic index was slightly lower than the second stage, both were higher than the iso-entropy exponent. With the increase of motor load rate, they firstly decreased gradually and then tended to be stabilized. If the intermediate cooler were taken into account, the first-stage compression polytropic index was slightly higher than the second stage. Both were lower than the iso-entropy exponent and increased slightly with the increase in the motor load rate. The optimal intermediate pressure of the oil-free twin-screw air compressor was quite complex, and it could not be simply considered as square root of the product of the compressed and the initial pressure. With the increase in motor load rate, the first-stage compression exhausted-air temperature gradually decreased, the second-stage compression exhausted-air temperature gradually increased, the first-stage exhausted-air pressure slightly decreased and the second-stage exhausted-air pressure slightly increased. Results of this work laid the foundation for better design and use of the oil-free twin-screw air compressor.

Key words: oil-free twin-screw air compressor, polytropic exponent, intermediate pressure, entropy, thermodynamics

CLC Number: 

  • TH138.21
[1] KRICHEL S V, SAWODNY O. Dynamic modeling of compressors illustrated by an oil-flooded twin helical screw compressor[J]. Mechatronics, 2011, 21(1): 77-84.
[2] FERREIRA C A I, ZAMFIRESCU C, ZAYTSEV D. Twin screw oil-free wet compressor for compression-absorption cycle[J]. International Journal of Refrig-eration, 2006, 29(4): 556-565.
[3] SAMBANDAM M T, MADLOOL N A, SAIDUR R, et al. Investigation of energy saving potentials in T-junction and elbow in compressed air systems[J]. Energy Efficiency, 2017, 10(5): 1099-1113.
[4] RANE S, KOVACEVIC A, STOSIC N, et al. Grid deformation strategies for CFD analysis of screw compressors[J]. International Journal of Refrigeration, 2013, 36(7): 1883-1893.
[5] 邢子文,吴华根,束鹏程. 螺杆压缩机设计理论与关键技术的研究和开发[J]. 西安交通大学学报, 2007, 41(7): 755-810. XING Ziwen, WU Huagen, SHU Pengcheng. Research and development on design theory and key technology of screw compressors[J]. Journal of Xi'an Jiaotong University, 2007, 41(7): 755-810.
[6] 王莲芝. 螺杆式空压机机油乳化分析[J]. 城市轨道交通研究, 2012, 15(10): 93-106. WANG Lianzhi. Analysis of the oil emulsification for screw compressor[J]. Urban Mass Transit, 2012, 15(10): 93-106.
[7] 李俊岭,韩志侃. 螺杆式空压机吸气过程技术改造[J]. 化工机械, 2016, 43(1): 125-128. LI Junling, HAN Zhikan. Technical reform of screw type air compressor suction process[J]. Chemical Engineering & Machinery, 2016, 43(1): 125-128.
[8] GUERROTO D, NOURI J M, STOSIC N, et al. Flow measurements in the discharge port of a screw compressor[J]. Process Mechanical Engineering, 2008, 222(4): 201-210.
[9] 金旭,王树刚,张腾飞, 等. 变工况双级压缩中间压力及其对系统性能的影响[J]. 化工学报, 2012, 63(1): 96-102. JIN Xu, WANG Shugang, ZHANG Tengfei, et al. Intermediate pressure and its effect on performance of two-stage compression system with variable operating mode[J]. CIESC Journal, 2012, 63(1): 96-102.
[10] SAIDUR R, RAHIM N A, HASANUZZAMAN M. A review on compressed-air energy use and energy savings[J]. Renewable and Sustainable Energy Reviews, 2010, 14(4): 1135-1153.
[11] CARELLO M, IVANOV A, MAZZA L. Pressure drop in pipe lines for compressed air:comParison between experimental and theoretical analysis[J]. Advances in Fluid Mechanics, 1998, 21: 35-44.
[12] GUO Z G, DENG G Y, CHU P, et al. Evaluation the role of multi-stage compression and waste heat recovery on compressed air energy storage system performance[J]. Applied Mechanics and Materials, 2014, 492(1): 19-23.
[13] SAPMAZ S, KILIC F, EYIDOGAN M, et al. Selection of compressors for petrochemical industry in terms of reliability, energy consumption and maintenance costs examining different scenarios[J]. Energy Exploration & Exploitation, 2015, 33(1): 43-62.
[14] VALENTI G, MURGIA S, CONTALDI G, et al. Experimental evidence of the thermal effect of lubricating oil sprayed in sliding-vane air compressors[J]. Case Studies in Thermal Engineering, 2014, 4: 113-117.
[15] QIN J, LI W, DENG C. Parameters selection and profile calculation for screw rotor of twin screw air compressor[J]. Applied Mechanics and Materials, 2017, 873: 308-313.
[16] LIN W Q, KONG D W, CAI M L. Research on energy consumption of screw compressor under load/unload[J]. Applied Mechanics and Materials, 2011(84/85): 733-738.
[17] 方达宪,张红亚,王艳华. 流体力学[M]. 武汉: 武汉大学出版社, 2018: 227.
[18] 朱明善,林兆庄,刘颖,等. 工程热力学[M]. 北京: 清华大学出版社, 1995: 91-92.
[19] 孙家枢,郝荣亮,钟志勇. 热喷涂科学与技术[M]. 北京:冶金工业出版社, 2013: 28-30.
[20] 张益波,任佳,潘海鹏,等. 一类热定型机换热器的动态建模方法[J]. 化工学报, 2011, 62(8): 2360-2366. ZHANG Yibo, REN Jia, PAN Haipeng, et al. A kind of dynamic modeling method for heat-exchangers of heat-setting machine[J]. CIESC Journal, 2011, 62(8): 2360-2366.
[21] 陈更林,李德玉. 流体力学与流体机械[M]. 徐州: 中国矿业大学出版社, 2012: 330.
[22] 张良,许思传,万玉. PEM燃料电池用空压机多参数多目标优化[J]. 电源技术, 2016, 40(1): 81-83. ZHANG Liang, XU Sichuan, WAN Yu. Multi-objective and multi-parameter optimization for centrifugal compressor used in PEM fuel cells[J]. Power Technology, 2016, 40(1): 81-83.
[23] 王刚华,柏劲松,孙承纬, 等. 准等熵压缩流场反演技术研究[J]. 高压物理学报, 2008, 22(2): 149-152. WANG Ganghua, BAI Jinsong, SUN Chengwei, et al. Backward integration method for tracing isentropic compression field[J]. Chinese Journal of High Pressure Physics, 2008, 22(2): 149-152.
[24] 徐晓明,陈德泉,杨恒,等. 通用机械设备与系统运行及节能[M]. 上海: 同济大学出版社, 2012: 28-29.
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