电站锅炉高温对流受热面壁温计算及氧化膜影响分析  

Tube Wall Temperature Calculation and Oxide Film Effects Analysis on Hightemperature Confection Heating Surface of Utility Boiler

作　　者：吴恺 王甲安 吕伟为 徐鸿[3] 

机构地区：[1]华电电力科学研究院材料技术部,浙江杭州310030 [2]国电河北龙山发电有限责任公司,河北邯郸056400 [3]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《发电与空调》2015年第1期20-24,29,共6页

摘　　要：火电厂锅炉爆管事故是电厂事故中最常见的情形之一,爆管事故的发生对电厂的安全性经济性影响巨大。而此类问题的发生和锅炉管壁温度超温密不可分,因此若能全面准确可靠的监测受热面管壁温度将对电厂意义重大。但是电厂锅炉由于炉内壁温测点安装较困难,另外由于炉内温度高,即使安装了测点,测点通常寿命不长。通常安装在炉外大包内的壁温测点只能在一定程度上反应管道内部介质的温度,而对于最危险处的壁温却无法直接得到。本文针对此问题,对壁温计算模型进行了分析,利用Fluent数值模拟软件进行了燃烧模拟计算,使用Delphi语言对该计算模型编制了相应的程序,结合某电厂2028t/h锅炉实例进行计算,并假设氧化膜存在对结果的影响进行了再次计算和分析。能对电厂锅炉的安全运行提供正确的指导,也可为电厂锅炉管道的及时检修提出指导,具有重要的工程实用价值。Power plant boiler pipe rupture accident is one of the most common situations in power plant. Tube-burst accident has had a huge impact on the safety and economy in Power plant. The occurrence of such problems are inextricably linked with the boiler tube wall over-temperature, so it is great significance to comprehensively accurately and reliably mon-itor the tube wall temperature of heat exchangers in power plants. But due to the power plant boiler furnace wall temperature measuring point is difficult to install. Even if installed, the high temperature in the furnace usually makes it not long life. For the most dangerous place, the wall temperature cannot directly obtain.Aimed at this problem, this author analyze the wall temperature calculation model, combined with power plant example of 2028 t/h boiler, use Delphi language to compile the corresponding program for the calculation model, use numerical simulation software Fluent to simulate combustion calcula-tion and assumes the oxide film existence to calculate and analysis the effect again. This paper has significant engineering practical value, it can provide the correct guidance on the safety operation of power plant boiler, and also can put forward the guidance for power plant boiler pipe reparations.

关 键 词：锅炉 在线监测 金属壁温 程序模块 氧化膜 

分 类 号：TM621.2[电气工程—电力系统及自动化]