基于热电偶测温的漏钢预报系统

河北钢铁集团燕山钢铁有限公司炼钢二厂2号板坯连铸机使用的漏钢预报系统,是重庆赛迪冶炼装备系统集成工程技术研究中心有限公司为该厂开发的结晶器智能管理系统的子系统,该系统基于热电偶测温,采用逻辑判断和神经网络方法进行漏钢预报。系统投入使用后,多次避免了漏钢事故的发生,对稳定生产起到了较大的推动作用。根据系统在现场的使用情况,分析应用效果并提出改善措施。实践证明,采取改善措施后,漏钢预报的准确度大大提高。     

气化炉用抗氧化耐冲刷热电偶研究

根据气化炉用热电偶保护管的特性,选择MoSi2 复合管作为热电偶的保护管,并通过特殊结构设计,采用PtRh30/6 热电偶丝装配成一种高抗氧化耐冲刷的新型热电偶,在气化炉条件下,其工作温度为室温~1600℃,承受压力6.5~8.5MPa,测温误差≤0.5%t。经现场使用,其使用寿命>3个月。     

The Researches on Performance and Technology of Strengthened Pure Platinum Wire

This paper discusses about the purity of strengthened pure platinum wire and the development method of platinum micro wire, in order to solve the difficulties of low tensile strength, easy to break, and low rate of micro wire. And it contrasts some performance of strengthened pure platinum wire and sponge Pt wire. The researches draw a conclusion that the thermoelectric properties of strengthened pure platinum micro wire was in accordance with national standards and satisfied users’ requirements.     

Improving the Quality of Thermocouple Wire Made of Platinum-rhodium Alloys

For the manufacture of S-type thermocouple the so-called thermocouple wire of platinum and platinum-rhodium alloy is used.One of the main technical requirements for the quality of the wire,according to State Standard of Russia(GOST 10821),is the uniformity of its largest thermoelectric force(Thermo-emf) in the length different sections.It was found that a determining impact on the uniformity of the wire thermo-emf is the distribution of rhodium along the length of the wire.The impact of platinum-rhodium melt crystallization conditions on the inhomogeneity of wire manufactured from it.It was suggested that the chemical inhomogeneity of the wire is related to the liquation phase of platinum-rhodium alloy.     

真空炉温度均匀性测量的数值模拟研究

热电偶是检测真空炉温度均匀性的常用计量器具,热电偶的几何特性及发射率对炉温均匀性检测的影响目前少有研究。本文利用数值模拟方法研究了热电偶发射率和直径对真空炉温度均匀性检测的影响,结果表明直径和发射率对常用规格热电偶稳态温度影响量级相当。开展零维模型分析,结果表明热电偶温度对直径和发射率相对变化率的敏感性相等,验证了数值模拟结论的准确性,为真空炉温度计量提供了理论指导与技术借鉴。     

大力神130型焦炉煤气燃气轮机T5热电偶故障原因分析

大力神130型焦炉煤气燃气轮机点火升速期间出现AL_T5_TC_Fail（T5热电偶故障）报警、CL_5_TC_Fail（多个E热电偶故障）并且导致停机。对各个相关系统进行检查分析,提出解决办法。最终发现该故障原因为部分喷嘴堵塞,故障检查可为同类机组提供参考。     

基于贝叶斯理论的热电偶合格判定风险

民用航空用易耗型廉金属热电偶的指标要求远高于其他行业,但在进行计量确认时,一般忽略了测量不确定度的影响,带来了较大的质量风险.本文基于贝叶斯理论,对测量过程和测量不确定度对易耗型廉金属热电偶符合性判断的特定消费者风险和全局消费者风险进行分析.探究不同测量过程和不确定度下的决策错误率风险,并提出了降低风险的方法,为易耗型...     

Reliability of Core Exit Thermocouple for Accident Management Action during SBLOCA and Abnormal Transient Tests at ROSA/LSTF

Presented are experimental results on the general performances of core exit thermocouples (CETs) to detect core overheat for accident management (AM) action by using the Large-Scale Test Facility (LSTF) of the ROSA Program of the Japan Atomic Energy Agency. The LSTF is a full-height, full-pressure, and 1/48-volumetric-scaled model of a 4-loop pressurized water reactor (PWR). This study was motivated by a significant delay in the time and temperature rise of the CETs from core heat-up during a vessel top head small break loss-of-coolant accident (SBLOCA) test. A certain delay in time and temperature rise of the CETs was also observed in various SBLOCA and abnormal transient tests. Such CET performances are derived from thirteen LSTF tests as follows: (1) general CET performances are obtained in the form of equations including cases under limited influences of water fall-back from hot legs, (2) the major reason for the delay is the interaction of three-dimensional steam flows with low-temperature structures in and around the core and core exit, (3) break location was insignificant except for the PV top and bottom break cases, and (4) CET superheat is suitable for AM instead of the temperature value for significantly high or low pressure transients. The applicability of the results to PWR is discussed further.     

铝合金的热电偶单接点快速动态温度标定实验研究

采用比较法对铝合金LF5—康铜和铝合金6063T6—康铜进行了热电偶单接点快速温度标定实验,获得了这两种铝合金材料的理想温度标定曲线。     

节能技术在精馏系统中的应用

能源问题始终困扰着石化行业,因此节能还是主要旋律。精馏依然是物系分离的耗能大户,改进精馏设备和精馏流程还是重中之重。文章主要介绍几种新型的精馏流程,并简要描述它们在一些体系中的应用。