本文選題：氣化灰渣　切入點：理化特性　出處：《華東理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：氣化灰渣的理化特性能夠反映煤氣化過程的轉(zhuǎn)化效率和氣化爐的運(yùn)行情況。研究灰渣的理化特性,掌握灰渣形成機(jī)理對提高煤氣化效率和優(yōu)化氣化爐設(shè)計具有重要意義。本文以工業(yè)氣流床粉煤氣化、水煤漿氣化、水煤(焦)漿氣化生成的粗渣、細(xì)渣、飛灰以及SE爐特殊形態(tài)的灰渣為研究對象,系統(tǒng)研究了不同氣化條件下生成的灰渣的物理化學(xué)特征。研究不同氣化爐、不同氣化條件下生成的灰渣,測試了 SE爐不同粒徑區(qū)域的灰渣樣品的物理化學(xué)特征,在此基礎(chǔ)上對氣化灰渣中不同形態(tài)顆粒進(jìn)行了分類�；以w粒的不同形態(tài),對應(yīng)著其在氣化爐內(nèi)的經(jīng)歷的不同氣化歷程,從而形成了不同殘?zhí)己�、礦物質(zhì)組成等。原煤煤質(zhì)、氣化爐爐型、氣化工藝條件等因素決定了粗渣和細(xì)渣中不同形態(tài)灰渣顆粒的含量與分布,進(jìn)而決定了氣化灰渣的殘?zhí)己�、粒徑分布、宏觀形態(tài)等特征。對比研究水煤(焦)漿氣化灰渣與煤氣化灰渣的理化特性,結(jié)果表明石油焦與煤共氣化所得灰渣殘?zhí)己枯^高,灰渣的粒徑也比煤氣化灰渣粒徑粗,這主要與石油焦及其混煤煤質(zhì)有關(guān)。對SE氣化裝置中的設(shè)備積灰、纖維渣等非典型形態(tài)灰渣進(jìn)行了理化特性的分析。氣化爐中的部分細(xì)灰被合成氣夾帶進(jìn)入洗滌系統(tǒng),并沉積于設(shè)備中形成了一些致密的塊狀渣。分析研究表明,不同設(shè)備處積灰的殘余碳含量以及灰化學(xué)組成與細(xì)渣相近,其色澤、硬度等性質(zhì)略有差異;積灰在不同設(shè)備處的富集現(xiàn)象可以用其殘?zhí)己徒M成的差異進(jìn)行解釋;纖維渣的形成主要是由氣化爐排渣不暢、以及混煤顆粒中單煤灰分組成、灰融熔特性差異大引起的。
[Abstract]:The physicochemical properties of gasification ash can reflect the conversion efficiency of coal gasification process and the operation of gasifier. Mastering the formation mechanism of ash and slag is of great significance for improving the efficiency of coal gasification and optimizing the design of gasifier. In this paper, the coarse slag and fine slag produced by the gasification of industrial airflow bed coal, water coal slurry and water coal (coke) slurry are used to improve the efficiency of coal gasification and to optimize the design of gasification furnace. The physical and chemical characteristics of fly ash and the special form of fly ash in SE furnace were studied systematically under different gasification conditions, and the slags produced in different gasifiers and different gasification conditions were studied. The physical and chemical characteristics of slag samples with different particle sizes in SE furnace were tested, and on the basis of this, different morphology particles in gasified ash were classified. Corresponding to its different gasification process in gasifier, resulting in different residual carbon content, mineral composition, etc. Raw coal, gasifier type, Factors such as gasification process conditions determine the content and distribution of different forms of ash particles in coarse slag and fine slag, and then determine the residual carbon content and particle size distribution of gasified ash. The physical and chemical properties of gasification ash and coal gasification slag with water coal (coke) slurry are compared. The results show that the residual carbon content of ash obtained from co-gasification of petroleum coke and coal is higher, and the particle size of ash is also larger than that of coal gasification ash. This is mainly related to the quality of petroleum coke and its mixed coal. The physicochemical properties of the equipment in SE gasification unit, such as dust deposition and fiber slag, are analyzed. Some fine ash in the gasifier is entrained into the washing system by syngas, and some of the fine ash in the gasifier is entrapped into the washing system. The results show that the residual carbon content and the chemical composition of the ash are similar to those of the fine slag, and the color, hardness and other properties of the ash are slightly different. The accumulation of ash in different equipments can be explained by the difference of its carbon residue and composition, and the formation of fiber slag is mainly caused by the poor discharge of slag from gasifier and the composition of single coal ash in mixed coal particles, which is caused by the great difference of ash melting characteristics.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ541

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