循环流化床锅炉散热损失的测试与估算分析  

Test and Estimation of Heat Loss for Circulating Fluidized Bed Boiler

作　　者：焦同帅 阎维平[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《热能动力工程》2016年第10期38-42,124-125,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：现行国标和行业标准在估算循环流化床锅炉散热损失时认为分离器与锅炉本体散热强度相同,为衡量这种方法的合理性,对一台440 t/h的燃煤电站循环流化床锅炉进行了散热损失现场测试及不确定度分析。将锅炉系统外表面分成134块区域,共设置1 333个测点,最终测得锅炉系统的散热损失为0.731%,不确定度为0.08%,说明测试结果具有很高的精确度,而按国标和行业标准估算的散热损失值仅为0.432%。经分析,锅炉系统内锅炉本体、汽水系统、热风系统的散热强度相差较小,散热损失与其面积成正比,但绝热式分离器及回料系统的散热强度为前者的5倍,以16.2%的散热面积占据47.6%的散热量。因此国标和行业标准估算循环流化床锅炉散热损失的方法存在较大的系统不确定度。With the current national standard and industry standard,the separator and the boiler body are considered to be in the same specific heat load when estimating the heat loss of circulating fluidized bed boiler. In order to evaluate the rationality of this method,a 440 t / h circulating fluidized bed coal-fired utility boiler was tested to quantify the heat loss and its uncertainty was analyzed. The boiler was divided into 134 zones and 1333 measurement points. And the heat loss of the boiler system was measured at 0. 731% with the uncertainty of 0. 08%,indicating great test accuracy. According to the national standard and industry standard,the estimated heat loss,however,was only 0. 432%.Detailed analysis indicates that the specific heat load of the boiler body,steam water system and hot air system of the boiler system are relatively small,and the heat loss is proportional to the area. But the heat dissipation of the heat insulating separator and the return system is 5 times the former,with 16. 2% of the area generating 47. 6% of the heat dissipation. Therefore,there is a large degree of system uncertainty on the method of estimating the heat loss of circulating fluidized bed boiler outlined by the current national standard and industry standard.

关 键 词：循环流化床 散热损失 散热强度 不确定度分析 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]