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.

在理论上和实验中提出了一种同时测量管内流速和结垢因子的方法。测量的原理基于传热特性，该特性取决于管子的加热长度，流速和结垢因子。进行数值分析是作为热传导的共轭问题和对流的结合问题，该问题是局部与外表面的均匀热量通量密度均匀加热的污染管。在加热部分，流速和结垢因子及其对流体温度的依赖性的管子壁温度之间的无量纲关系来自数值结果。从数值结果中估计的该方法的准确性在流速和结垢因子上大约是三个预算。流速和结垢因子的测试范围分别为1-2.5m/s和0-2x10^<-4> m^2k/w。供暖能力控制，数据采集和数据分析会自动使用个人计算机进行。 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 Thermal Problems Vol.V,Part 1 Proceedings of the Fifth International Conference" Pineridge Press Ltd.,U.K., 597-608 (1987)

Tetsu FUJII；Shigeru KOYAMA；Kan-ei SHINZATO：“热问题数值方法 Vol.V，第 1 部分第五届国际会议论文集”Pineridge Press Ltd.，U.K.，597-608 (1987)

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。