共查询到17条相似文献,搜索用时 203 毫秒
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利用快中子透射法和散射法研究管道口径在62.0mm~126.5mm范围内对测量输油管道油垢厚度响应的影响。实验装置由中子源、中子探测器和微机多道谱仪组成。结果表明:在透射法中,随着管道口径的增加,检测输油管道油垢的灵敏度减小,线性相关系数的平均值为0.993 0,测量精度平均为0.698 4mm。在散射法中,应用指数拟合的结果较好,将数据线性处理,取线性区间,结果显示,随着管道口径增加,线性区间在增大,线性相关系数的平均值为0.958 3,平均测量精度为0.625 7mm。实验结果对进一步开展快中子检测输油管道油垢厚度的研究有一定的指导作用。 相似文献
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γ射线透射法检测输油管道油垢的标定实验研究 总被引:10,自引:0,他引:10
用γ射线透射法对新疆克拉玛依油田φ74mm输油管道油垢的检测进行了标定实验研究,测量了该管道的油垢厚度响应曲线,其结果表示为In(N0/N)=0.00392d—0.00677,并研究了保温层对测量结果的影响。实验装置由^137Csγ放射源和Nal(Tl)闪烁探测器组成。测量结果表明:油垢厚度响应曲线是灵敏的,保温层对测量结果影响不大。 相似文献
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利用由中子束发射器、中子探测器和BH1224型微机多道谱仪组成实验装置,研究了采用同一轴线法检测油垢(聚乙烯模拟)厚度时不同散射角对散射中子计数的响应关系,另外利用MCNP/4C程序模拟了采用同一横截面法中不同散射角时中子计数与油垢厚度响应关系.结果显示,采用同一横截面法检测油垢厚度优于同一轴线法,大散射角优于小散射角... 相似文献
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为改进应用γ射线散射法在原油输运过程中的结垢厚度检测方法,建立一系列模拟实验来研究原油对检测油垢厚度的影响,实验中以石蜡模拟原油。结果表明,在原油厚度小于输油管道内径的三分之一时,随着油垢厚度的改变,散射光子数变化明显,灵敏度较高。在此情况下,用γ射线散射法测量油垢厚度是一可行途径。 相似文献
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137Csγ射线透射法检测输油管道油垢的初步实验研究 总被引:19,自引:2,他引:17
用γ射线透射法对新疆克拉玛依油田输油管道油垢检测进行了实验研究。实验测量装置由13 7Csγ放射源和NaI(Tl)闪烁晶体探测器等组成。克拉玛依油田油垢厚度响应为ln(N0 /N) =0 .0 0 5 4 8d -0 .0 0 4 6 ,石蜡厚度响应为ln(N0 /N) =0 .0 0 5 2 2d -0 .0 1 2 6。结果表明 :油垢厚度响应比石蜡厚度响应更灵敏。 相似文献
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用γ射线透射法测量输油管道油垢的厚度响应 总被引:12,自引:3,他引:9
用γ射线透射法对克拉玛依油田输油管道油垢检测进行了实验研究,测量了油垢的厚度响应,并对测量方法进行了研究,实验测量装置由^137Csγ放射源性和NaI(Tl)闪烁探测器等组成,结果表明:油垢厚度 响应ln(N0/N)=0.00548d-0.0046,油垢厚度响应是灵敏的。 相似文献
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Zheng Jinxing Song Yuntao Chunlong Zhou Huang Xiongyi Lu Kun Wang Jun Ding Kaizhong Zhu Haisheng 《Journal of Fusion Energy》2014,33(5):594-599
According to the requirements of large superconducting components, all the solid superconducting insulation of current leads, magnets, cooling and measurement pipeline at high potential should withstand 80–300 K thermal cycles. If helium leak or pipe leak taken place, and insulation has been formed some flaws, Paschen discharge would be occur. The experimental program aimed at analyzing the low-temperature electro-physical performance of solid superconducting insulation, which was designed with different configuration such as thickness, material structure and so on. The dielectric performance of both pre-preg cryogenic insulation and the wet wrap cryogenic insulation were studied. Both of the dielectric strength of the two type insulation is in the range from 11 to 23 kV/mm at 80 K helium condition. Besides, both of the two type insulation samples of 3 and 5 mm thickness can withstand 30 kV under various helium pressures at 80 K. 相似文献
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A simple formula is given which allows to calculate the contribution of the total neutron cross-section including the Bragg scattering from different (hkl) planes to the neutron transmission through a solid crystalline silicon. The formula takes into account the silicon form of poly or mono crystals and its parameters. A computer program DSIC was developed to provide the required calculations. The calculated values of the total neutron cross-section of perfect silicon crystal at room and liquid nitrogen temperatures were compared with the experimental ones. The obtained agreement shows that the simple formula fits the experimental data with sufficient accuracy. A good agreement was also obtained between the calculated and measured values of polycrystalline silicon in the energy range from 5 eV to 500 μeV. The feasibility study on using a poly-crystalline silicon as a cold neutron filter and mono-crystalline as a thermal neutron one is given. The optimum crystal thickness, mosaic spread, temperature and cutting plane for efficiently transmitting the thermal reactor neutrons, while rejecting both fast neutrons and gamma rays accompanying the thermal ones for the mono crystalline silicon are also given. 相似文献