Effect of calcium oxide on pyrolysis of coal in a fluidized bed
Effect of calcium oxide on pyrolysis of coal in a fluidized bed
复制标题
DOI：
10.1016/s0378-3820(00)00075-8
复制
发表时间：
2000-05
影响因子：
7.5
通讯作者：
Zhu Tingyu;Zhang Shouyu;Huang Jiejie;Wang Yang
中科院分区：
文献类型：
--
作者：
Zhu Tingyu;Zhang Shouyu;Huang Jiejie;Wang Yang
在常压流化床反应器中，在450-750°C温度范围内，研究了神木烟煤在氧化钙存在和不存在下的热解。氧化钙显著增加气体产率，同时降低焦油产率。分析和比较了在存在和不存在氧化钙的情况下产生的焦油。结果表明，在无氧化钙存在下，煤热解的焦油产率在650°C时达到最大值，与泰勒的结果一致。当加入氧化钙时，焦油最大产率的温度降低到550°C。氧化钙的存在使焦油中H/C、苯、甲苯、二甲苯（BTX）、苯酚、甲酚、二甲酚（PCX）等轻组分的比值增大，（O+N+S）/C比值和氧化物含量降低。研究结果表明，在有氧化钙存在的情况下，焦油中烷烃的最大组成为C14-C20，而在无氧化钙存在的情况下，焦油中烷烃的最大组成为C8-C15。这是由于氧化钙的加入使长链烷烃断裂成短链烷烃的结果。
The pyrolysis of Shenmu bituminous coal in both the presence and absence of calcium oxide was studied under atmospheric pressure over a temperature range of 450–750°C in a fluidized bed reactor. Calcium oxide significantly increases the gas yield while decreasing the tar yield. Tars produced in both the presence and absence of calcium oxide were analyzed and compared. The results indicated that tar yields reach a maximum at 650°C for coal pyrolysis without calcium oxide, in accordance with Tyler's results. When calcium oxide is added, the temperature of tar maximum yield is reduced to 550°C. It is also demonstrated that the ratio of H/C; benzene, toluene, xylene (BTX); phenol, cresol, xylenol (PCX) and other light components in tar increase while the ratio of (O+N+S)/C and oxide compounds in tar decrease in the presence of calcium oxide. It is noted that the maximum composition of alkanes in tar is C14–C20in the presence of calcium oxide, while it is C8–C15in the absence of calcium oxide. It results from the fracture of alkanes with long chains to alkanes with short chains when calcium oxide is added.