[理學(xué)]畢業(yè)設(shè)計(jì)論文說(shuō)明書(shū)范本-文庫(kù)吧
2025-01-03 14:35 本頁(yè)面
【正文】 床燃煤固硫渣與石灰、粉煤灰或水泥混合，必要時(shí)摻加激發(fā)劑，從強(qiáng)度上看完全可以滿(mǎn)足公路工程對(duì)路基混合料的要求。關(guān)鍵詞：流化床，燃煤固硫渣，活性，膨脹，資源46成都紡織高等專(zhuān)科學(xué)校畢業(yè)設(shè)計(jì)（論文）說(shuō)明書(shū) 英文摘要ABSTRACTDue to lack of effective ways to utilize the bottom ashes of circulating fluidized bed bustion (CFB ashes), it is difficult to use widely the advanced technology of circulating fluidized bed bustion and defulfurization. In this paper, the properties of the CFB ashes are systematically analyzed and then a series of methods are proposed to evaluate the reactivity of CFB ashes. Meanwhile, the factors influencing and the method activating the reactivity of CFB ashes, and the expansion properties are investigated experimentally. The spontaneous setting, and the mechanism of activation of reactivity of CFB ashes and its expansion are investigated by XRD and SEM. Finally, the utilization in building materials of CFB ashes is studied.The results show that: (1) The CFB ashes is different from the ashes of mon coal boiler for there are great difference in forming condictions such as the bustion temperature, bustion environment, the degree of bustion, desulfurizer and the efficiency of desulfurization. While CFB ashes have the properties of cement and expansion for its containing SO3 and fCaO, so it is a special pozzolanic material. (2) The SO3 and fCaO have their properties for their typical forming condition. SO3 is fixed in ashes at 850~900℃, and it exists in ⅡCaSO4 and has different solubility with the natural anhydrite and the plaster calcined at 400℃. It is the first time to prove that the particles of fCaO is coated withⅡCaSO4 by investigating the process of forming fCaO, the microstructure, spathic type and optic parameter and the hydrating process. Results also show that the microstructure can slow down the hydrating and deteriorate the reactivity of CFB ashes. (3) The current method evaluating reactivity of pozzolanic materials has great limits to evaluate the CFB ashes. A series of new methods are developed which can
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