热力发电
熱力髮電
열력발전
THERMAL POWER GENERATION
2014年
12期
44-48
,共5页
回转式空预器%搪瓷蓄热元件%传热特性%流动特性%拟合公式
迴轉式空預器%搪瓷蓄熱元件%傳熱特性%流動特性%擬閤公式
회전식공예기%당자축열원건%전열특성%류동특성%의합공식
rotary air preheater%enamel heat storage element%heat transfer characteristics%flow characteris-tics%fitting formular
回转式空气预热器(空预器)的传热与流动特性和所用蓄热元件的类型密切相关。搭建了回转式空预器蓄热元件传热与流动特性实验台，并通过周期性的风门切换，使得冷、热风交替冲刷蓄热元件，模拟回转式空预器的非稳态换热过程。通过实验研究 NF 型搪瓷蓄热元件不同雷诺数下的努塞尔数、压降以及阻力系数的变化规律，得出其传热和流动特性的拟合公式。
迴轉式空氣預熱器(空預器)的傳熱與流動特性和所用蓄熱元件的類型密切相關。搭建瞭迴轉式空預器蓄熱元件傳熱與流動特性實驗檯，併通過週期性的風門切換，使得冷、熱風交替遲刷蓄熱元件，模擬迴轉式空預器的非穩態換熱過程。通過實驗研究 NF 型搪瓷蓄熱元件不同雷諾數下的努塞爾數、壓降以及阻力繫數的變化規律，得齣其傳熱和流動特性的擬閤公式。
회전식공기예열기(공예기)적전열여류동특성화소용축열원건적류형밀절상관。탑건료회전식공예기축열원건전열여류동특성실험태，병통과주기성적풍문절환，사득랭、열풍교체충쇄축열원건，모의회전식공예기적비은태환열과정。통과실험연구 NF 형당자축열원건불동뢰낙수하적노새이수、압강이급조력계수적변화규률，득출기전열화류동특성적의합공식。
The heat transfer and flow characteristics of rotary air preheater is closely related to the type of the heat storage element,in which the NF-type enamel heat storage elements can be used in the cold end of rotary air preheater.However,the heat transfer and flow characteristics requires further study.The experi-mental system was built up for studying the heat transfer and flow characteristics of the heat storage ele-ment.By switching the damper periodically,the cold and hot air scours the storage element alternately,thus the unsteady heat transfer process of rotary air preheater is simulated.Through experimental study on change rules of the NF-type enamel heat storage elements'Nusselt number,pressure drop and drag coeffi-cient with different Reynolds numbers,the NF-type enamel heat storage elements'fitting formulas of heat transfer characteristics and flow characteristics were obtained.
