高温型循环流化床锅炉炉膛传热系数的试验研究

Experimental Study on Heat-transfer Coefficient in Furnace of High-temperature CFB Boilers

为了测定高温型循环流化床(CFB)锅炉炉膛的传热系数,在热功率1MW的CFB锅炉试验台上对试验受热面的传热系数进行了试验和测定,研究了床温和颗粒悬浮密度对传热特性的影响.通过对试验数据进行回归分析得到了炉膛传热系数与床温和颗粒悬浮密度的关联模型.结果表明:随着床温的升高及颗粒悬浮密度的增大,炉膛传热系数相应增大;该关联模型得到的炉膛传热系数计算值与试验值的误差小于7%,该关联模型可用于高温型CFB锅炉的设计计算.

To measure the in-furnace heat-transfer coefficient of high-temperature CFB boilers,experiments were carried out on a 1MW hot-state CFB boiler's test facility,during which the heat-transfer coefficient was measured and the influence of bed temperature and solid suspension density on the heat-transfer characteristics was analyzed.A correlation model of heat-transfer coefficient associated with the bed temperature and solid suspension density was then obtained through regression analysis of the test data.Results show that the in-furnace heat-transfer coefficient increases with the rise of bed temperature and solid suspension density;the error of in-furnace heat-transfer coefficient between calculated results and actual measurements is less than 7%,indicating high precision of the correlation model,which therefore may be used in design of high-temperature CFB boilers.