玻璃负载Fe_2O_3/TiO_2的制备及催化超声降解钻井污水COD_(Cr)性能研究

Gradation of Stress Concentration Extent Based on Magnetic Memory Test and Its Application for Drilling Rig Evaluation

为寻求有效降解钻井污水CODCr的新方法和新途径,以玻璃负载Fe2O3/TiO2作为催化剂,研究了钻井污水的催化超声降解。考察了超声波频率、Fe2O3掺杂量、溶液pH值等条件对钻井污水CODCr降解的影响。试验结果表明,掺入摩尔分数为4.0%的Fe2O3的玻璃负载Fe2O3/TiO2催化剂对钻井污水CODCr的降解效果比未掺杂的TiO2的降解率提高了1.96倍。在超声波频率20kHz,输出功率50W,pH值为3.0,温度为30℃,钻井污水的CODCr初始浓度1000.4mg/L的条件下,80min超声催化处理后的CODCr降解率可达到90.1%以上。

Metal magnetic memory testing (MMMT) is a new nondestructive test (NDT) technique, which is one of the effective means for testing the defects of stress concentration in ferromagnetic metal structure and equipment, but in application, there exist problems of stress concentration gradation in test evaluation. On the basis of studying testing principle and characteristic parameters of magnetic memory, it is pointed out that the characteristic parameters can be used as bases for judging the stress concentration extent by analyzing the testing data of magnetic memory of fatigue testing on 45# and Q345# steels, and the results of stress concentration gradation of 2 materials are provided. Its application for rig safety evaluation shows that it is rational for using the testing parameters as bases of judgement, but the gradation range depends on the fatigue test