本文關(guān)鍵詞： 氣化爐噴嘴 龜裂 等離子噴涂 鋁鉬涂層 高溫硫腐蝕　出處：《華東理工大學》2016年碩士論文　論文類型：學位論文

【摘要】：水煤漿氣化技術(shù)不僅能夠提高煤的利用效率,而且減少煤在使用過程中造成的的污染。噴嘴是氣化爐的核心部件之一,在運行過程中,噴嘴端部迎火面經(jīng)常發(fā)生沿孔口的徑向放射性裂紋和不規(guī)則龜裂,停爐更換或修復噴嘴嚴重影響了生產(chǎn)的連續(xù)性并造成了巨大的經(jīng)濟損失。研究表明,高溫腐蝕特別是硫腐蝕作用是噴嘴端面龜裂的主要原因。本研究以開發(fā)具有良好抗高溫硫腐蝕和氧腐蝕性能的涂層為目的,以Inconel 600合金和Mo涂層為比較對象重點研究了Al-Mo涂層的高溫腐蝕性能。介紹了采用機械合金化方法制備Al-Mo金屬間化合物粉末并運用等離子噴涂技術(shù)制備了分別以Mo和NiCrAlY為粘結(jié)層的Al-Mo涂層和Mo涂層；研究比較了Inconel 600合金、以NiCrAlY為粘結(jié)層的Mo涂層和以NiCrAlY為粘結(jié)層Al-Mo涂層抗高溫硫腐蝕性能；研究比較了Inconel 600合金、Mo涂層和以Mo為粘結(jié)層Al-Mo涂層抗高溫硫腐蝕和抗高溫氧腐蝕性能。研究表明,Mo比NiCrAlY更適合用于Al-Mo涂層的粘結(jié)層材料；以Mo為粘結(jié)層的Al-Mo涂層在高溫硫腐蝕環(huán)境中比Mo涂層能更有效地保持表面宏觀和截面微觀結(jié)構(gòu)的完整性,能夠更有效地阻擋硫蒸汽向試樣內(nèi)部的擴散；且以Mo為粘結(jié)層的Al-Mo涂層在高溫氧化環(huán)境中其抗高溫氧腐蝕性比Mo涂層顯著提高。由此可見,等離子噴涂以Mo為粘結(jié)層的Al-Mo涂層不僅具有優(yōu)良的抗高溫硫腐蝕性能,且其抗高溫氧腐蝕性能較Mo涂層也有顯著提升。該涂層的提出有希望為氣化爐噴嘴龜裂失效問題的解決提供了一種經(jīng)濟、便捷、有效的技術(shù)方案。
[Abstract]:Coal water slurry gasification technology can not only improve the efficiency of coal utilization, but also reduce the pollution caused by coal in use. The nozzle is one of the core parts of gasifier. Radial radiative cracks and irregular cracks along the orifice are often found in the nozzle tip, which seriously affects the continuity of production and results in huge economic losses, as a result of stopping the furnace to replace or repair the nozzle. High temperature corrosion, especially sulfur corrosion, is the main cause of nozzle face crack. The purpose of this study is to develop coatings with good resistance to high temperature sulfur corrosion and oxygen corrosion. The high temperature corrosion properties of Inconel 600 alloy and Mo coating were studied, and the preparation of Al-Mo intermetallic compound powder by mechanical alloying and plasma spraying were introduced. Al-Mo coating and Mo coating with NiCrAlY as bonding layer; The high temperature sulfur corrosion resistance of Inconel 600 alloy, Mo coating with NiCrAlY as bonding layer and Al-Mo coating with NiCrAlY as bond layer was studied and compared. The high temperature sulfur corrosion resistance and high temperature oxygen corrosion resistance of Inconel 600 alloy Mo coating and Al-Mo coating with Mo as bonding layer were compared. The results show that Mo is more suitable than NiCrAlY to be used as binder material for Al-Mo coating. In high temperature sulfur corrosion environment, Al-Mo coating with Mo as bonding layer can effectively maintain the integrity of surface macro and cross section microstructure and prevent sulfur vapor from diffusing into the sample interior more effectively than Mo coating. Moreover, the Al-Mo coating with Mo as the bonding layer is more resistant to high temperature oxygen corrosion than that of Mo coating in high temperature oxidation environment. It can be seen that the plasma sprayed Al-Mo coating with Mo bond coating not only has excellent high temperature sulfur corrosion resistance. The high temperature oxygen corrosion resistance of the coating is also significantly improved than that of Mo coating, which provides an economical, convenient and effective technical scheme for solving the problem of nozzle crack failure in gasifier.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TQ545;TG178

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