TG-DSC法研究含铁冶金副产品对煤粉燃烧性能影响.pdfVIP

TG-DSC 法研究含铁冶金副产品对煤粉燃烧性能影响 邹 冲 温良英 尹成彬 张生富 白晨光 谭秀琴 （重庆大学材料科学与工程学院，重庆 400030 ） 摘 要 从化学成分、粒度、添加剂对煤粉燃烬度的影响等三方面对 8 种典型含铁冶金副产品进行了初步筛选，利 用 TG-DSC 法研究了初选出的铁精矿粉、转炉除尘灰和污泥等三种典型含铁副产品对煤粉燃烧反应性和燃烧效率 的影响。结果表明，铁精矿粉、转炉除尘灰和污泥可使喷吹煤粉燃烧速率和燃烬性均明显提高，着火点均降低 10 ℃左右，燃烧效率提高 2%~5% 。但由于冶金副产品中绝大部分成分不参与燃烧且需吸收热量，在一定程度上抑制 了放热量的提高。通过比较分析得出其对于燃烧性能改善作用的顺序依次为：转炉除尘灰转炉污泥铁精矿粉。 关键词 煤粉 燃烧效率 含铁冶金副产品 TG-DSC 法1 Effect of Iron Containing Metallurgical Byproducts on Pulverized Coal Combustion by TG-DSC Method Zou Chong Wen Liangying Yin Chengbin Zhang Shengfu Bai Chenguang Tan Xiuqin (School of Materials Science and Engineering, Chongqing University, Chongqing, 400030) Abstract Eight typical metallurgical byproducts containing iron were selected based on the effect of the chemical composition, particle size, additives on the burnout degree of pulverized coal. Effect of three typical byproducts including fine iron ore, BOF dust and BOF sludge on combustion reactivity and combustion efficiency were investigated using TG-DSC method. The results indicated that the three additives have obvious catalytic effects on pulverized coal. The combustion rate and burnout behavior were improved, the ignition temperature was decreased by about 10 ℃, and the combustion efficiency increased by 2%~5% with byproducts addition. However, since the most of chemical composition of byproducts didn’t participate in combustion and consumed more heat, the incremental value of heat release was depressed. By comparison, the relative active sequence of byproducts to the catalytic combustion can be described as follows: BOF dustBOF sludgefine iron ore. Key words pulverized coal, combustion efficiency, metallurgi