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因子的方法，并进行了实验验证。该测量方法的基本原理是基于传热特性，传热特性取决于被加热管的长度、流速和污垢因子，并将污垢管的传热与对流耦合问题转化为数值分析，其中污垢管的外表面受到均匀热流密度的局部加热。由数值计算结果导出了受热段管壁温度、流量和污垢因子沿着之间的无量纲关系及其对流体温度的依赖关系。计算结果表明，该方法的计算精度在流量和污垢因子方面均在3%左右。流速和污垢因子的测试范围分别为1-2.5m/s和0- 2 × 10 ~（10）<-4>m^2K/W。加热功率控制、数据采集和数据分析由个人计算机自动进行。试验中流速Δ U和污垢因子Δ R的最大误差为：对于清洁管，Δ U= 5%;对于给定流速，Δ R= 1.2 × 10 ~<-5>（-1）m&lt;@12 &lt;@D1K/W;

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。

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）。

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。

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。

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)