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液态铅铋合金是加速器驱动次临界系统(ADS)中散裂靶兼冷却剂的主要候选材料。氧浓度是影响液态铅铋合金(LBE)对结构材料腐蚀的关键因素,而氧传感器是实现液态铅铋合金中氧浓度精确测量的重要部件,本研究设计研制了一种液态铅铋系统氧传感器并基于自主研制的高温液态铅铋合金氧测控预研平台,初步开展了氧饱和LBE中的氧浓度测量实验。实验结果显示,300~400℃的氧饱和LBE中,氧传感器的电压信号(E)随温度(T)变化的实验曲线与理论曲线变化趋势相吻合;相对于300℃T350℃温度范围,氧传感器在350℃T400℃范围内的测量性能更好,仪器本身的系统误差约为17mV。 相似文献
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液态铅铋合金是加速器驱动次临界系统(ADS)中散裂靶兼冷却剂的主要候选材料.氧浓度是影响液态铅铋合金(LBE)对结构材料腐蚀的关键因素,而氧传感器是实现液态铅铋合金中氧浓度精确测量的重要部件,本研究设计研制了一种液态铅铋系统氧传感器并基于自主研制的高温液态铅铋合金氧测控预研平台,初步开展了氧饱和LBE中的氧浓度测量实验.实验结果显示,300~400℃的氧饱和LBE中,氧传感器的电压信号(E)随温度(T)变化的实验曲线与理论曲线变化趋势相吻合;相对于300℃<T<350℃温度范围,氧传感器在350℃< T<400℃范围内的测量性能更好,仪器本身的系统误差约为17mV. 相似文献
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共晶在池式液态铅铋合金固态氧控实验装置平台上进行了Cu/Cu2O型氧传感器的研发和测试,氧控平台从500℃阶梯式降温到300℃,降温过程铅铋合金中通入95%Ar+5%O2的混合气体令液态铅铋共晶合金(LBE)保持氧饱和状态。结果表明,在300~500℃温度区间内,采用Cu/Cu2O作为参比电极的氧传感器从准确性、响应性上都表现出良好的性能;氧传感器能迅速地对因温度变化而带来的氧浓度变化做出响应;氧传感器测量的电动势与理论电动势的相对误差保持在±3%内,氧浓度误差保持在±10%内,信号波动小于1.7 mV。 相似文献
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《核技术》2015,(4)
液态铅铋合金是加速器驱动次临界系统(Accelerator Driven Sub-critical System,ADS)反应堆主选冷却剂材料之一,阀门是高温液态铅铋实验回路的重要组成部件之一,它的流动阻力大小直接影响整个回路装置的结构设计与安全运行。基于液态铅铋流体测量技术实验回路PREKY,开展了Y型截止阀在液态铅铋堆典型工况下的阻力特性测量实验研究,利用压差变送器获得压差实验数据,并与理论计算结果进行对比分析,验证了实验测量方法的可行性和测量结果的合理性。另外,获得了流速1.2–2.0 m·s-1内液态铅铋介质中Y型截止阀流阻理论计算指数x值为2.4,此值可直接应用于未来液态铅铋实验回路流阻计算与分析工作。 相似文献
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液态铅铋反应堆中铅铋合金氧浓度直接影响到结构材料的寿命和热工水力学性能,需要控制在特定范围以保证堆的正常运行。温度会影响铅铋中氧浓度的变化行为,因此也就影响着氧浓度控制的精确度和范围。为获得温度对氧浓度变化的影响规律,在450~600℃温度范围内进行相关实验以获得氧传感器电压信号E和氧浓度CO随时间和温度的变化曲线。实验结果显示,温度升高对加速耗氧过程中氧浓度变化较为明显,而对补氧过程表现为减速作用,可能原因为温度升高加速了耗氧过程中氧扩散与氧化物分解反应速率,但对补氧过程中金属元素氧化物生成的放热反应有一定的抑制效应。 相似文献
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液态铅铋回路设计研制与材料腐蚀实验初步研究 总被引:8,自引:1,他引:7
铅铋合金共晶体是加速器驱动次临界系统(ADS)重要的散裂靶材料和冷却剂候选材料,也是先进快中子堆的重要冷却剂材料,液态铅铋回路是开展液态铅铋合金相关技术研究的必备实验平台。FDS团队正在设计研制KYLIN系列铅铋实验回路,本文基于中国首座热对流铅铋回路KYLIN-Ⅰ开展了马氏体钢T92、CLAM和奥氏体钢316L在480℃下,流速为0.14 m/s的饱和氧浓度铅铋中的腐蚀实验研究。初步实验结果显示,三种实验材料均发生氧化腐蚀。 相似文献
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针对FDS团队建造的PREKY液态高温铅铋回路测控系统的需求,在Lab VIEW2009开发环境下,利用PXI系列数据采集卡实现了对回路温度、压力和液位信号的实时测量,并由上位机完成对实验数据的在线分析和保存。同时,利用虚拟仪器技术研制了一套具备远程监控、故障诊断和报警功能的液态铅铋回路测控系统,并对回路电磁泵出口压力测量结果进行了误差分析。 相似文献
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单线态氧引起的蛋白质损伤研究 总被引:1,自引:0,他引:1
在光敏剂参与下,生物组织经特定波长光辐照后产生的损伤或死亡称为光敏反应或光动力反应。光敏剂的激发态与基态氧发生激发能转移或电子转移产生单线态氧(^1O2)和超氧阴离子自由基(O^2-).^1O2是一种反应活性相当高的亲电瞬态中间体,能高效地氧化生物大分子,造成生物体的损伤。蛋白质分子是单线态氧氧化的主要靶分子之一。蛋白质中主要的发色基团有色氨酸、酪氨酸、苯丙氨酸、组氨酸、半胱氨酸、胱氨酸等,它们与单线态氧的反应受到普遍关注,以酪氨酸为例简要介绍如下: 相似文献
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《Journal of Nuclear Science and Technology》2013,50(3):214-220
The self-diffusion coefficient of oxygen in single crystal thoria was determined at 1,350°C in an 18O-enriched CO2 atmosphere of oxygen partial pressure 3×10?4 atm. The coefficient was close to the intrinsic self-diffusion coefficient determined in an oxygen atmosphere of 0.27 atm indicating the oxygen partial pressure independence. On the basis of the results, the mechanism was discussed for the conductivity data for thoria in the literature being due to the intrinsic diffusion and the extrinsic diffusion of oxygen ion and due to the intrinsic p-type electronic conduction predominant under high oxygen partial pressures. 相似文献
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采用显微激光拉曼光谱技术、称重及形貌观察等手段,开展了UF4在氧气或相对湿度93%湿氧气氛中的热化学反应实验研究,获取了UF4不同温度时效后的质量、颜色及失重情况,以及反应前后不同铀化合物的拉曼光谱。结果表明:UF4在氧气或湿氧中加热至200 ℃时,性质稳定,其拉曼光谱基本无变化;250~600 ℃时,样品表面颜色发生明显变化。拉曼光谱分析发现,在氧气气氛中有UO2F2、UO2、U3O8,在湿氧气氛中有UO2F2、UO2F2•2H2O、UO2F2•nH2O、UO2、U3O8等多种铀化合物生成。随着温度的升高,UF4在氧气中的化学反应速率呈现由慢到快再到慢的变化趋势。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(5):314-319
A study was made on the method of controlling oxygen partial pressure in the range of 10?4~10?8 atm by the addition of oxygen into purified argon gas through stabilized zirconia cell. The oxygen partial pressures obtained by controlling the electric current passed through the cell and the feed rate of the carrier gas were found to agree well with theoretical values in the range of 10?4 to 10?6 atm oxygen partial pressure. Below 10?6 atm, however, some discrepancy appeared between the theoretical and observed values, due to the oxygen partial pressure being reduced by the reaction with impurity gases such as hydrogen present in the argon. A discussion is also presented on the measured polarization curves for the anode and cathode of the stabilized zirconia cell. 相似文献
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Taku Matsumoto Tatsumi Arima Yaohiro Inagaki Kazuya Idemitsu Masato Kato Kyoichi Morimoto 《Journal of Nuclear Science and Technology》2015,52(10):1296-1302
The oxygen potentials of (Pu0.928Am0.072)O2–x were measured as a function of oxygen to metal ratio (O/M) in the temperature range from 1473 to 1873 K by the gas equilibrium method using thermogravimetry. The measured data were about 200 kJ/mol higher in the O/M ratio range from 2.00 to 1.96 and about 50 kJ/mol higher in the reducing region (below O/M ratio = 1.94) compared with those of PuO2–x. The measured oxygen potentials were analyzed by the point defect chemistry method. From this analysis, the oxygen potential of (Pu0.928Am0.072)O2–x was represented as a function of O/M ratio and temperature and calculated results were consistent with the measured data. 相似文献
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A V4Ti alloy and several V4Cr4Ti alloys with different oxygen contents were studied on their tensile properties with the effect of hydrogen concentrations. The ductility of the alloys showed a successive decrease in a varied rate with an increased hydrogen concentration, while the ultimate tensile strength remained unchanged or even decreased for the high oxygen content alloy in spite of the occurrence of hardening in the low oxygen content alloy. Oxygen in the alloy causes grain boundary weakening, increasing the possibility of intergranular fractures and thus enhancing the hydrogen embrittlement. V4Ti showed a higher resistance to the hydrogen embrittlement as compared to the V4Cr4Ti alloys on a similar oxygen content level. 相似文献