旋转式能量回收装置在反渗透海水淡化系统中的应用研究

发布时间：2018-07-10 06:38

本文选题：反渗透海水淡化 + 能量回收装置　；参考：《天津大学》2016年硕士论文

【摘要】：旋转式能量回收装置(RERD)作为反渗透海水淡化系统的主要节能设备,对于降低系统能耗和产水成本具有重要意义。改善和提升旋转式能量回收装置的密封性能是实现装置高效率运行的关键,也是此类型装置研究的重点方向。本文设计开发了一套处理量为15m3/h新型外驱旋转式能量回收装置,并建立了满足其性能评测要求的一套全工艺反渗透海水淡化系统。本文采用上下两个PEEK平面端盘、不锈钢转子和套筒组成能量回收装置核心转动单元,在装置上、下端盘与转子端面间总间隙为0.04mm条件下,对新设计的外驱旋转式能量回收装置进行了密封性能测试。结果表明:在操作压力为6.0MPa,装置的盐水流通量为13m3/h时,装置的静态泄漏量仅为0.105m3/h;相同盐水处理量及操作压力条件下,转速为500rpm时,装置的动态泄漏量为0.57m3/h,能量回收效率为91.2%。为提高装置的能量回收效率,本文将静压支承技术应用到装置结构设计中,通过在原有的平面端盘上增设静压引流孔和环形槽,构建了新型静压支承端盘结构。在相同的操作压力、装置处理量和端面间隙下,比较分析了平面端盘和支承端盘对装置性能的影响规律。结果表明:在操作压力为4.7MPa,装置的处理量为13m3/h,装置的转子转速为500rpm条件下,含有静压支承端盘的装置的泄漏量仅为0.30m3/h,较平面端面降低了60%;能量回收效率为93.2%,较平面端盘装置提高了2.2%。论文研究了装置的混合度与转子转速和装置处理量间的变化关系。结果表明:恒定操作压力和装置的处理量时,装置的混合度随转子转速的增大而降低;当装置处理量为9m3/h时,转子转速从300rpm升高到500rpm,装置的混合度从28.7%降低到16.5%。恒定操作压力和装置的转子转速,装置的混合度随着装置处理量的增大而增大;当装置的转子转速为500rpm时,装置的处理量从9m3/h逐渐增大到13m3/h时,装置的混合度从13%升高到16.5%。最后,对RERD装置和反渗透系统耦合运行稳定性进行了测试评价。结果表明:当装置的处理量为16m3/h、操作压力为6.0MPa和装置转子转速500rpm时,进出RERD装置的四股流体的流量和压力波动较小,高压流体压力损失为0.132MPa,低压流体压力损失为0.107MPa,装置的能量回收效率达到92.5%。
[Abstract]:As the main energy saving equipment of reverse osmosis seawater desalination system, rotary energy recovery device (RERD) is of great significance to reduce the energy consumption and water production cost of the system. Improving and improving the sealing performance of rotary energy recovery device is the key to realize the high efficiency operation of the device, and is also the key research direction of this type of device. In this paper, a new type of 15m3/h external drive rotary energy recovery device is designed and developed, and a full-process reverse osmosis seawater desalination system is established to meet the requirements of performance evaluation. In this paper, the core rotation unit of the energy recovery device is composed of two peek flat end disks, stainless steel rotor and sleeve. On the device, the total clearance between the lower end disk and the rotor end surface is 0.04mm. The sealing performance of the newly designed external drive rotary energy recovery device is tested. The results show that when the operating pressure is 6.0 MPA and the brine flux is 13m3/h, the static leakage rate is only 0.105 m3 / h, and the dynamic leakage rate is 0.57 m3 / h and the energy recovery efficiency is 91.2% when the rotating speed is 500rpm under the same brine treatment capacity and operating pressure. In order to improve the energy recovery efficiency of the device, the static pressure supporting technology is applied to the structure design of the device. A new type of static pressure supporting end disk structure is constructed by adding static pressure drainage holes and annular grooves to the original plane end disk. Under the same operating pressure, processing capacity and end clearance, the effects of the plane end disk and the supporting end disk on the performance of the device are compared and analyzed. The results show that when the operating pressure is 4.7 MPA, the processing capacity of the device is 13 m3 / h, and the rotor speed of the device is 500rpm, The leakage rate of the device with static pressure supporting end disk is only 0.30 m3 / h, which is 60 lower than that of the plane end face, and the energy recovery efficiency is 93.22.The energy recovery efficiency is 2.2% higher than that of the plane end disk device. The relationship between the mixing degree of the device and the rotor speed and the handling capacity of the device is studied in this paper. The results show that the mixing degree of the device decreases with the increase of rotor speed when the operating pressure and the handling capacity of the device are constant, and the rotor speed increases from 300rpm to 500rpm and the mixing degree decreases from 28.7% to 16.5% when the handling capacity of the unit is 9m3/h. At constant operating pressure and rotor speed, the mixing degree of the device increases with the increase of the processing capacity of the device, and when the rotor speed of the device is 500rpm, the handling capacity of the device increases from 9m3/h to 13m3/h, and the mixing degree of the device increases from 13% to 16.5%. Finally, the stability of RERD and reverse osmosis system is tested and evaluated. The results show that the flow rate and pressure fluctuation of four strands of fluid in and out of RERD are relatively small when the processing capacity is 16m3 / h, the operating pressure is 6.0MPa and the rotor speed is 500rpm. The pressure loss of high pressure fluid is 0.132 MPa and the pressure loss of low pressure fluid is 0.107 MPA. The energy recovery efficiency of the device is 92.5 MPA.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P747

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