Development of On-Line Monitoring Device for Fouling in A Tube

管内结垢在线监测装置的研制

• 批准号: 61850039
• 负责人: FUJII Tetsu
• 金额: $ 4.16万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61850039/
• 关键词: Thermal Engineering Equipment; Simultaneous Measurement; Fouling Factor; Flow Velocity; On-line Monitoring; Condenser Tube; 復水器管; 管内汚れ; 流速; 強制対流熱伝達; センサ

A method for simultaneous measurement of flow rate and fouling factor inside a tube is proposed theoretically and verified experimentally. The principle of the measurement is based on heat transfer characteristics which depend on the heated length, flow rate and fouling factor of the tube.A numerical analysis is carried out as a conjugate problem of thermal conduction and convection for a fouled tube which is locally heated with uniform heat flux density from the outer surface. Dimensionless relationship among tube wall temperature at the heated part, flow rate and fouling factor along with its dependence on fluid temperature is derived from the numerical results. The accuracy of this method which is estimated from the numerical results is about three precent in both flow rate and fouling factor.A titanium tube and an aluminum brass tube with two heaters of different length are tested. The test ranges for flow velocity and fouling factor are 1-2.5m/s and 0-2x10^<-4> m^2K/W, respectively. Heating power control, data acquisition and data analysis are automatically carried out with a personal computer. The maximum errors for flow velocity Delta U and fouling factor Delta R in the test are as follows: Delta U= 5% for clean tubes, Delta R= 1.2x10^<-5> m<@12<@D1K/W for given velocity, and Delta R= 2x10<@D1-5@>D1 m<@D12@>D1K/W and Delta U= 25% for the simultaneous measurement.

从理论上提出了一种同时测量管内流量和污垢系数的方法，并进行了实验验证。测量原理基于传热特性，传热特性取决于管的加热长度、流量和结垢系数。针对局部加热的结垢管，对热传导和对流的共轭问题进行了数值分析。外表面的热流密度均匀。从数值结果得出了加热部分的管壁温度、流量和污垢系数之间的无量纲关系及其对流体温度的依赖性。从数值结果估计该方法的精度在流量和结垢系数方面约为百分之三。对带有两个不同长度的加热器的钛管和铝黄铜管进行了测试。流速和污垢系数的测试范围分别为1-2.5m/s和0-2x10^<-4>m^2K/W。加热功率控制、数据采集和数据分析均通过个人计算机自动进行。测试中流速 Delta U 和污垢因子 Delta R 的最大误差如下：洁净管 Delta U= 5%，给定 Delta R= 1.2x10^<-5> m<@12<@D1K/W速度，Delta R= 2x10<@D1-5@>D1 m<@D12@>D1K/W，Delta U= 25%，用于同时测量。

项目成果

K.SHINZATO;T.FUJII;Sh.KOYAMA;T.NOSETANI: "Experiment of Simultaneous Measurement of Fouling Factor and Flow Rate" Proceediengs of the 25th National Heat Transfer Symposium of Japan. 217-219 (1988)

K.SHINZATO;T.FUJII;Sh.KOYAMA;T.NOSETANI：“同时测量结垢因子和流量的实验”第 25 届日本全国传热研讨会论文集。

藤井哲: 日本機械学会論文集.

Satoshi Fujii：日本机械工程师学会会议录。

新里寛英,藤井哲,小山繁,野世渓精: 日本機械学会論文集(B編).

Hirohide Niisato、Tetsu Fujii、Shigeru Koyama、Kei Nose：日本机械工程师学会会议录（B 版）。

Tetsu,Fujii; Shigeru,KOYAMA; Kan-ei,SHINZATO: Numerical Methods in Thernal Problems VOL. V, Part 1 Proceedings of the Fifth International Conference. 597-608 (1987)

藤井哲；

K.SHINZATO;T.FUJII;Sh.KOYAMA;T.NOSETANI: SECOND INTERNATIONAL SYMPOSIUM on CONDENSERS AND CONDENSATION. (1990)

K.SHINZATO;T.FUJII;Sh.KOYAMA;T.Nosetani：第二届国际冷凝器和冷凝研讨会。