摘要
为了实现空压机设备的能效提升,开发了1台额定功率为250 kW的双级喷油螺杆空压机,空压机的低、高压级均采用新型螺杆转子型线,压缩机在结构上采用了一系列创新设计,对级间压力、喷油量等关键运行参数进行了优化,并通过试验测试对所开发双级喷油螺杆空压机样机的能效进行了评估。结果表明,在最佳转速为1330 r/min时,容积效率可达到95.6%,低压级和高压级压缩机的绝热效率则分别达到93.3%,88.6%;依据GB 19153—2019对样机能效进行评估,在100%,70%和40%负载下,样机均可达到定转速喷油回转空压机一级能效,考虑到空压机在额定负载与部分负载时的综合性能,其机组比功率可达到5.72 kW/(m^(3)·min),相较于一级能效限定值低了7.7%,达到了“双一级能效”,实现了同类螺杆空压机产品的能效升级。此外,通过试验研究了转速变化对双级喷油螺杆空压机低、高压级p-V指示曲线和效率的影响规律。经研究发现,低压级压缩过程p-V曲线低于等熵压缩过程,转速变化对其影响较小,而高压级压缩过程p-V曲线受气体泄漏影响显著,转速升高会导致高压级压缩过程曲线逐渐变缓;低压级和高压级压缩机效率随转速变化呈现出不同的变化规律,且高压级压缩机的容积效率和绝热效率均对转速变化非常敏感。研究结果可为螺杆空压机的能效升级提供参考价值。
In order to enhance the energy efficiency of air compressors,a two-stage oil-injected screw air compressor with a rated power of 250 kW was developed.A novel rotor profile designed specially for this application was adopted in the low-and highpressure stage compressors.A series of innovative design was adopted in the structure of the air compressor.The key operating parameters of the air compressor,such as interstage pressure and oil injection flowrate,were optimized,and then an experimental test was carried out on a well-instrumented test rig to evaluate the energy efficiency of the developed air compressor prototype.The experimental results show that the volumetric efficiency of the air compressor can reach 95.6%at the optimal speed of 1330 r/min,while the adiabatic efficiency of the low-and high-pressure stage compressors can reach 93.3%and 88.6%,respectively.The energy efficiency of the developed air compressor prototype was evaluated according to GB 19153—2019 standard.The air compressor prototype all can reach the energy efficiency of the first stage of constant speed oil-injected rotary air compressor under 100%,70%and 40%load,respectively.Considering the overall performance of the compressor under rated load and part load,the specific power of its unit can reach 5.72 kW/(m^(3)·min),which is 7.7%lower than the corresponding value of first-stage energy efficiency,which has reached“dual first-stage energy efficiency”,and achieved energy efficiency upgrade of the like screw air compressor products.In addition,the effects of change in rotating speed on the p-V indicator diagram and efficiencies of low and high stage of the two-stage screw compressor were researched experimentally.It is found through research that the p-V indicator diagram in the low pressure stage compression process is lower than that of the adiabatic compression process,and the change in rotating speed exerts only a minor influence on it.However,the p-V indicator diagram in the high pressure stage compression process is affected consi
作者
廖新忠
林思桥
王闯
苏小仕
邢子文
LIAO Xinzhong;LIN Siqiao;WANG Chuang;SU Xiaoshi;XING Ziwen(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Xiamen East Asia Machinery Industry Co.,Ltd.,Xiamen 361100,China)
出处
《流体机械》
CSCD
北大核心
2024年第3期1-7,23,共8页
Fluid Machinery
基金
国家自然科学基金青年基金项目(52206021)。
关键词
双螺杆压缩机
空压机
双级压缩
试验研究
p-V指示曲线
twin screw compressor
air compressor
two-stage compression
experimental research
p-V indicator curve
