气流床气化灰渣的理化特性研究

发布时间：2018-03-05 00:33

本文选题：气化灰渣　切入点：理化特性　出处：《华东理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：气化灰渣的理化特性能够反映煤气化过程的转化效率和气化炉的运行情况。研究灰渣的理化特性,掌握灰渣形成机理对提高煤气化效率和优化气化炉设计具有重要意义。本文以工业气流床粉煤气化、水煤浆气化、水煤(焦)浆气化生成的粗渣、细渣、飞灰以及SE炉特殊形态的灰渣为研究对象,系统研究了不同气化条件下生成的灰渣的物理化学特征。研究不同气化炉、不同气化条件下生成的灰渣,测试了 SE炉不同粒径区域的灰渣样品的物理化学特征,在此基础上对气化灰渣中不同形态颗粒进行了分类。灰渣颗粒的不同形态,对应着其在气化炉内的经历的不同气化历程,从而形成了不同残碳含量、矿物质组成等。原煤煤质、气化炉炉型、气化工艺条件等因素决定了粗渣和细渣中不同形态灰渣颗粒的含量与分布,进而决定了气化灰渣的残碳含量、粒径分布、宏观形态等特征。对比研究水煤(焦)浆气化灰渣与煤气化灰渣的理化特性,结果表明石油焦与煤共气化所得灰渣残碳含量较高,灰渣的粒径也比煤气化灰渣粒径粗,这主要与石油焦及其混煤煤质有关。对SE气化装置中的设备积灰、纤维渣等非典型形态灰渣进行了理化特性的分析。气化炉中的部分细灰被合成气夹带进入洗涤系统,并沉积于设备中形成了一些致密的块状渣。分析研究表明,不同设备处积灰的残余碳含量以及灰化学组成与细渣相近,其色泽、硬度等性质略有差异;积灰在不同设备处的富集现象可以用其残碳和组成的差异进行解释;纤维渣的形成主要是由气化炉排渣不畅、以及混煤颗粒中单煤灰分组成、灰融熔特性差异大引起的。
[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.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ541

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