易汽化介质加注过程泵控模式研究

发布时间：2018-06-22 01:18

本文选题：易汽化介质 + 变频控制技术　；参考：《华南理工大学》2015年硕士论文

【摘要】：中国目前是全球第二大石油消费国,消费量仅次于美国,每天都有大量的燃油由加油机售出。而这些燃油大多为易汽化介质,因其较高的饱和蒸汽压,在其泵送过程中存在泵送效率低,计量精度不高等问题,这样使得燃油加注过程中的能量损耗大大增加。本文首先分析了现有的燃油泵送系统在效率、精度等方面上的存在的一些不足。然后在变频控制技术的基础上,通过理论分析、数值计算以及实验验证,探究了提高燃油泵送效率和计量精度,以及减小水击效应的新型泵控模式。本文的研究内容主要包括以下几个方面:(1)针对现有易汽化介质普遍存在的泵送效率不高的特点,在详细分析泵送系统的效率组成及特点,并在大量实验的基础上,提出了能效自适应的控制方法。即通过使用变频控制技术,实时查找泵送系统在不同工况条件下的运行效率,然后使其在效率最高的频率点运行。并对该控制方法的泵送效率进行了相应的验证实验。(2)建立了最小被测量加注误差的数学模型,提出了带有缓冲频率的变频加注方法,同时搭建了加注精度的测试平台,并通过实验验证了该加注方法在控制精度方面的效果。(3)探究了燃油泵送系统由水击效应带来的危害,通过数学推导得到水击计算的数学模型。搭建了关阀水击的测试平台,验证该计算模型的准确性。通过MATLAB仿真得到管道流量、管道长度、管道直径以及关阀时间对关阀水击的影响。最后提出基于变频技术的减小水击的控制措施。
[Abstract]:China is now the world's second-largest oil consumer, second only to the United States, with large quantities of fuel sold by tankers every day. However, most of these fuels are vaporized medium, because of their high saturated vapor pressure, there are some problems such as low pumping efficiency and low measurement precision in the pumping process, which greatly increases the energy loss in the fuel injection process. In this paper, the shortcomings of the existing fuel pump delivery system in efficiency and precision are analyzed. Then on the basis of frequency conversion control technology, through theoretical analysis, numerical calculation and experimental verification, a new pump control mode is explored to improve fuel pump delivery efficiency and measurement accuracy, and to reduce water hammer effect. The research contents of this paper mainly include the following aspects: (1) in view of the characteristic that the pump efficiency is not high in the existing vaporizing medium, the composition and characteristics of the pumping system are analyzed in detail, and on the basis of a large number of experiments, An adaptive control method for energy efficiency is proposed. That is, by using frequency conversion control technology, the efficiency of pumping system under different working conditions can be found in real time, and then the pump system can be operated at the frequency point with the highest efficiency. The pump efficiency of the control method is verified by corresponding experiments. (2) A mathematical model of minimum measured injection error is established, and a frequency conversion injection method with buffer frequency is proposed. At the same time, a testing platform for injection accuracy is built. The effect of the injection method on the control accuracy is verified by experiments. (3) the harm caused by the water hammer effect in the fuel pump delivery system is explored, and the mathematical model of water hammer calculation is obtained by mathematical derivation. The test platform of closing valve water hammer was built to verify the accuracy of the calculation model. The effects of pipe flow, pipe length, pipe diameter and closing time on water hammer are obtained by MATLAB simulation. Finally, the control measures of reducing water hammer based on frequency conversion technology are put forward.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE974

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