端面造型技术在转子式能量回收装置中的应用研究

发布时间：2018-02-26 04:21

本文关键词： 反渗透海水淡化转子式能量回收装置表面造型效率扭矩　出处：《天津大学》2015年硕士论文　论文类型：学位论文

【摘要】：能量回收装置作为反渗透海水淡化系统的重要组成部分,被用来回收从反渗透膜组件中排出的高压浓盐水中的压力能,对大幅度降低海水淡化系统的能耗具有决定性作用。转子式能量回收装置是目前应用最广泛的产品类型之一,具有能量回收效率高,出水压力稳定,处理量灵活,安装体积小等优点。然而,转子式能量回收装置存在转子通道内流体存在压力突变现象和动密封效果不佳的问题。本论文通过首次引入端面造型技术,应用于转子式能量回收装置,对端盘表面进行造型。完成了装置在造型前后的对照实验,改进了转子式能量回收装置的上述不足之处。首先,本论文通过在端盘表面进行均压槽造型的方法,提高转子转动的稳定性。在间隙为0.05 mm,转子转速为500 rpm,操作压力为1.0-6.0 MPa的工况条件下,分别完成了装置在进行端面均压槽造型前后的对照实验。实验数据表明,压力为6.0 MPa时,在进行均压槽造型前后,装置的扭矩由27 N?m降低到22 N?m,降幅为18%,装置的能量回收效率由82%提高到88%。结果表明,端面均压槽造型技术对提高转子式能量回收装置性能具有一定效果。然后,本论文通过在端盘表面进行螺旋浅槽造型的方法,在小间隙情况下减少装置的扭矩,解决装置间隙值与扭矩之间的矛盾。在间隙为0.035 mm,压力为1.0-6.0 MPa,转子转速为500 rpm工况下,研究先完成了装置在端面螺旋浅槽造型前后的对照实验。实验数据表明,压力为6.0 MPa时,在进行螺旋浅槽造型前后,装置的扭矩从13 N?m降低到7 N?m,降幅为46%,装置的效率由62%提高到85%。结果证明,应用螺旋浅槽造型的方法,可以很好地解决装置间隙与扭矩之间的矛盾,从整体上提高装置的性能。研究还完成了,具有螺旋浅槽造型的装置,在间隙为0.025 mm,压力为1.0-6.0 MPa,转子转速为500 rpm工况下的运行实验。结果表明,间隙缩小以后,压力为6.0 MPa时,装置的效率达到96.3%,这一效率值完全可以满足工业应用需求(不低于90%)。同时,这一技术还可应用于其它具有相似结构和工况条件的流体机械设备,提高流体的密封效果,延长密封件的使用寿命。
[Abstract]:As an important part of reverse osmosis seawater desalination system, the energy recovery device is used to recover the pressure energy from the high-pressure concentrated salt water discharged from the reverse osmosis membrane assembly. Rotor type energy recovery device is one of the most widely used products at present, with high energy recovery efficiency, stable effluent pressure and flexible treatment capacity. However, the rotor energy recovery device has the problems of sudden change of fluid pressure in the rotor channel and poor dynamic sealing effect. In this paper, the technology of end surface modeling is introduced for the first time. Applying to rotor type energy recovery device, the end disk surface is molded. The control experiment of the device before and after molding is completed, and the above deficiencies of rotor type energy recovery device are improved. In this paper, the stability of rotor rotation is improved by the method of equalizing pressure grooves on the end disk surface. Under the condition that the clearance is 0. 05 mm, the rotor speed is 500rpm, and the operating pressure is 1. 0-6. 0 MPa, the stability of rotor rotation is improved. The experimental results show that when the pressure is 6.0 MPa, the torque of the device changes from 27 N? M reduced to 22 N? The energy recovery efficiency of the device was increased from 82% to 88. The results show that the face equal pressure slot molding technology has some effect on improving the performance of the rotor type energy recovery device. In this paper, the method of spiral shallow groove modeling on the end disk surface is used to reduce the torque of the device in the case of small clearance, and to solve the contradiction between the gap value and the torque. Under the condition of the clearance 0.035mm, the pressure 1.0-6.0 MPa, the rotor speed 500 rpm. The experimental results show that when the pressure is 6.0 MPa, the torque of the device changes from 13N to 13N before and after the molding of the spiral shallow groove. M reduced to 7 N? The efficiency of the device was increased from 62% to 85. The results show that the contradiction between the gap and torque of the device can be well solved by using the method of shallow spiral groove modeling, and the overall performance of the device has been improved. When the gap is 0.025 mm, the pressure is 1.0-6.0 MPA, and the rotor speed is 500 rpm, the device with spiral shallow groove is operated. The results show that the pressure is 6.0 MPa after the clearance is reduced. The efficiency of the device is up to 96.30.This efficiency value can completely meet the needs of industrial applications (no less than 90 parts). At the same time, this technology can also be applied to other fluid mechanical equipment with similar structures and operating conditions to improve the sealing effect of the fluid. Extend the service life of sealing parts.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P747.5

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