煤灰中痕量元素非均勻分布特征與煤中礦物質蒸發(fā)特性的研究.pdf

1、華中科技大學碩士學位論文煤灰中痕量元素非均勻分布特征與煤中礦物質蒸發(fā)特性的研究姓名：田季林申請學位級別：碩士專業(yè)：化工過程機械指導教師：舒朝暉20070124II ABSTRACT Coal combustion is the main way to get energy in China. Great harm has been done to our health and the enviro

2、nment by the trace elements which are released from coal combustion. In the meantime, mineral matter that is concomitant with the coal is a crucial key to effect the ash aggradations and fec

3、ulence coagulation. Thus, it is essential to learn the characteristic of distribution of trace elements and the evaporation speciality of mineral matters. In the article, the content of trace el

4、ements in different density distinctions and granularity levels of Xiaolongtan flying ash were measured by means of ICP- MS and XRF, result indicated that: as the flying- ash’ s consistency or p

5、article size increasing, it shows different rules in the content of trace elements. Some are decreasing, some are increasing. Some are increasing first, and then decreasing, there is a maximum

6、 in a point. Some are decreasing first and then increasing, there is a minimum in a point. It behaves a characteristic of none- equality distribution. When the sulfur- removing ash are compared with the

7、 non- sulfur- removing ash, the content of trace element of former are lower than the latter. So the sulfur- removing system restrains the releasing of trace elements. What’ s more, the density

8、and the particle size more small, the more powerful the sulfur- removing system restrains the content of trace elements. Then thermogravimetric experiments of the coal from Shenfu, Xiaolongtan an

9、d Yangzonghai and their low temperature ash were compared. It was shown that the thermogravimetric curves of coal and their low temperature ash are common in that both of them have four diffe

10、rential thermogravimetric apices. The combustion characteristic of coal and its low temperature ash in two different atmospheres were analyzed. As to the coal, the kindling point，temperature of m

11、aximum weight loss, burnout temperature in condition of O2/CO2 are all lower when compared to the atmosphere of O2/N2. But the differences are all within 10%, which can be ignored. There is

12、no obvious rule about the low temperature ash when the atmosphere is changed. The heating rate also has an important influence on the thermogravimetric curve. When the heating rate is promoted