基于间歇非稳态方法的溶氧装置增氧能力检测

Evaluation of the oxygen transfer rate of oxygenator based on intermittent non-steady state method

针对常用溶氧装置增氧能力试验操作随意性和试验误差较大的缺点,通过试验研究,提出了一种基于间歇非稳态法的试验方法。从所需设施、设备,试验过程和计算方法几个方面进行了具体的说明。使用该方法对DP18-Y型多腔喷淋式溶氧装置进行了验证试验:在气液比(G/L)1︰100和1.5︰100两种条件下,系统稳定运行约130和220min,池内的平均溶解氧质量浓度达到17mg/L(接近理论饱和溶解氧浓度),3个测量点示值误差在±0.78mg/L范围内;在两种气液比条件下重复进行3次试验,增氧能力计算结果分别为(206.1±5.7)和(248.5±11.3)kg/h;不同区间段计算结果表明,试验起始点以越接近0mg/L越好,结束点应大于理论饱和浓度的70%。该试验方法的稳定性和重现性良好,可为检验溶氧装置的工作性能提供一种切实可行的试验方法。

According to the shortcomings of general method such as nonstandard operation and big test errors,a testing method based on intermittent non-steady state method was put forward to evaluate the standard oxygen transfer rate of the oxygenator. The paper introduced the facilities needed for the test,the testing step and the calculation method in detail. Using this method,DP18-Y,a multi-stage trickling oxygenator was tested. With two different G/L ratios 1：100 and 1.5：100,after about 130 min and 220 min running period separately,dissolved oxygen concentration（DO） in the testing pool had reached 17 mg/L,standard deviations at three DO probe positions were less than ±0.78. To verify the repeatability of the method,the test was repeated three times with the two G/L ratios,and the standard oxygen transfer rate calculated as a result was（206.1±5.7） kg/h and（248.5±11.3） kg/h,respectively. Calculated by different ranges,it was found that the calculation result would be more precision with the start point closer to 0 mg/L and the end point over 70% of theoretical DO saturation concentration. The results show that the method has good stability and repeatability and is feasible to evaluate the oxygen transfer rate of any oxygenator.