本文選題：煤自燃 + 層狀雙氫氧化物��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：層狀雙氫氧化物(LDHs)是一種無(wú)鹵無(wú)磷多功能無(wú)機(jī)材料,具有高效、環(huán)保、安全、抑煙,受熱分解釋放水蒸汽和二氧化碳等優(yōu)勢(shì),可作為新型煤自燃阻化劑。但是,目前層狀雙氫氧化物阻化劑的研究還處于初級(jí)階段。本文合成了一種新型層狀雙氫氧化物阻化劑,研究了其對(duì)不同變質(zhì)程度煤自燃的阻化特性及機(jī)理,對(duì)于該阻化劑的工業(yè)應(yīng)用具有一定的指導(dǎo)意義。本文采用原位共沉淀法制備了一種ZnMgAl-CO3-LDHs層狀雙氫氧化物阻化劑,利用熱重和氣體紅外光譜的測(cè)試手段對(duì)樣品結(jié)構(gòu)特性進(jìn)行了分析,得出該類(lèi)阻化劑氧化分解吸熱,并釋放出大量的水蒸氣和二氧化碳?xì)怏w。表明層狀雙氫氧化物具有延緩煤自燃氧化升溫,和降低煤表面氧濃度的特性。選取不同變質(zhì)程度的四種煤樣(神府長(zhǎng)焰煤和不粘煤、新疆焦煤、陽(yáng)泉無(wú)煙煤),與制備出的阻化劑按設(shè)定比例混合,機(jī)械攪拌均勻制成阻化煤樣。采用熱重/差示掃描量熱-傅里葉變換紅外光譜(TG/DSC-FTIR)聯(lián)用分析技術(shù),對(duì)添加不同比例的該層狀雙氫氧化物阻化劑煤樣進(jìn)行研究。TG曲線反映的臨界溫度、干裂溫度、著火點(diǎn)溫度等煤自燃特征溫度,添加阻化劑煤樣均高于原煤樣,其中當(dāng)阻化劑添加量為20%時(shí)升高量最大。各樣品DSC曲線上均出現(xiàn)放熱峰。添加阻化劑煤樣放熱峰面積明顯小于原煤樣。說(shuō)明這種ZnMgAl-CO3-LDHs層狀雙氫氧化物阻化劑在升溫過(guò)程中多級(jí)吸熱,能夠有效的抑制煤的氧化自燃。氣體紅外光譜分析顯示,阻化煤樣氧化放出的CO和CO2的量明顯減少,且阻化劑添加量越多,這些氧化氣體產(chǎn)生量越小。根據(jù)熱重分析結(jié)果,研究了原煤與阻化煤樣升溫氧化過(guò)程的反應(yīng)活化能,表明活化能隨阻化劑添加量增加而增大。因此,ZnMgAl-CO3-LDHs層狀雙氫氧化物阻化劑對(duì)不同變質(zhì)程度煤樣均具有良好的阻化效果,尤其對(duì)長(zhǎng)焰煤和不粘煤阻化效果更佳。阻化煤樣活化能增加,說(shuō)明該層狀雙氫氧化物阻化劑可能改變了煤氧化反應(yīng)的類(lèi)型或進(jìn)程,從而起到一定化學(xué)阻化作用。
[Abstract]:Layered double hydroxide (LDHs) is a non-halogen and phosphorus-free multifunctional inorganic material, which has the advantages of high efficiency, environmental protection, safety, smoke suppression, thermal decomposition and release of water vapor and carbon dioxide, etc. It can be used as a new type of coal combustion resistance agent. However, the study of layered double hydroxide inhibitors is still in the primary stage. In this paper, a new layered double hydroxide inhibitor has been synthesized, and its inhibition characteristics and mechanism to the spontaneous combustion of coal with different metamorphic degrees have been studied, which is of certain guiding significance for the industrial application of this inhibitor. In this paper, a ZnMgAl-CO3-LDHs layered double hydroxide inhibitor was prepared by in-situ coprecipitation method. The structure characteristics of the sample were analyzed by thermogravimetry and gas infrared spectroscopy, and the results showed that the oxidation decomposition of the inhibitor was endothermic. And release a lot of water vapor and carbon dioxide gas. The results show that the layered double hydroxides can delay the spontaneous combustion of coal and decrease the oxygen concentration on the coal surface. Four kinds of coal samples with different degrees of metamorphism (Shenfu long flame coal and non-caking coal, Xinjiang coking coal, Yangquan anthracite coal) were mixed with the prepared antidote according to the set proportion, and the mechanical stirring was used to make the blocking coal samples. The TGA / DSC-FTIR analysis technique was used to study the critical temperature and dry cracking temperature of the coal sample with different proportion of the layered double hydroxide inhibitor. The characteristic temperature of spontaneous combustion of coal, such as ignition point temperature, is higher than that of raw coal sample, especially when the amount of inhibitor is 20. Exothermic peaks appeared on the DSC curves of all samples. The exothermic peak area of coal sample added with inhibitor is obviously smaller than that of raw coal sample. The results show that this ZnMgAl-CO3-LDHs layered double hydroxide inhibitor can effectively suppress the oxidation spontaneous combustion of coal in the process of heating. The analysis of gas infrared spectrum shows that the amount of CO and CO2 released from the oxidation inhibition of coal samples is obviously reduced, and the more the amount of inhibitor is added, the smaller the production of these oxidized gases is. Based on the results of thermogravimetric analysis, the reaction activation energy of the oxidation process between the raw coal and the block coal is studied. It is shown that the activation energy increases with the increase of the amount of inhibitor. Therefore, ZnMgAl-CO3-LDHs layered double hydroxide inhibitor has good inhibition effect on different metamorphic coal samples, especially for long flame coal and non-caking coal. The increase of activation energy of coal samples indicates that the layered double hydroxide inhibitor may change the type or process of coal oxidation reaction and thus play a certain role in chemical inhibition.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD752.2

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