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分别从稻壳和木屑的工业分析和热重试验分析其着火特性和燃烧特性,再以稻壳和木屑分别在600、800℃成灰灰样为研究对象,通过射线荧光(XRF)、X射线衍射(XRD)进行研究分析,从微观角度对稻壳、木屑燃烧和灰熔融特性进行深入研究。研究发现:稻壳比木屑更难于着火,其着火温度高且燃烧性能差。XRD分析数据显示:稻壳在600℃下成灰灰样未成晶相,在800℃下成晶相较好,其物相以石英和方石英为主,存在少量莫来石晶体;600℃下制成的木屑灰中主要存在SiO_2、CaO和CaCO_3,而800℃下制成的木屑灰中SiO_2和CaCO_3,两种灰中还存在少量CaSO_4、K_2SO_4、Al_2O_3等晶相结构。XRF分析数据显示:稻壳灰中SiO_2含量较高,而木屑SiO_2和CaO含量较高,木屑和稻壳含有少量K碱金属,600℃下制成的灰中含有少量Cl元素,而800℃下未检测出Cl元素。稻壳和木屑中硅铝比较大,碱金属含量较低,根据煤炭标准的综合判别指数分析得出,稻壳和木屑在600、800℃成灰灰样结渣均较严重。
The ignition characteristics and combustion characteristics of rice hull and sawdust were analyzed respectively from industrial analysis and thermogravimetric analysis. The results showed that the hull and sawdust were gray ash samples at 600 and 800 ℃, respectively. The effects of XRF, Diffraction (XRD) was used to study and analyze the characteristics of rice husk, woodchip combustion and ash fusion from the microscopic point of view. The study found that: rice hull is more difficult to catch fire than sawdust, the ignition temperature is high and the burning performance is poor. The results of XRD analysis showed that the rice hull was gray-ash-like unformed phase at 600 ℃, and the crystalline phase was better at 800 ℃. The phases of the rice hull were mainly quartz and cristobalite, with few mullite crystals. At 600 ℃ There are mainly SiO_2, CaO and CaCO_3 in the woodchips, while the small amounts of CaSO_4, K_2SO_4, Al_2O_3 and so on in the two kinds of ash are the SiO_2 and CaCO_3 in wood dust which is made at 800 ℃. The results of XRF analysis showed that the content of SiO_2 in rice husk ash was high while the content of SiO_2 and CaO in sawdust was higher than that in wood chips and rice husk. No Cl element was detected. According to the comprehensive discriminant index analysis of coal standard, it was found that rice hulls and sawdust were more gray ash-like slagging at 600 and 800 ℃.