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Experimental Study of Adaptability of Huainan Coal in Texaco Gasification Technology

Author: FengZuo
Tutor: LiHanXu
School: Anhui University of Technology
Course: Chemical processes
Keywords: Ash fusibility Flux Coal Blending Ash viscosity Aspen Plus
CLC: TQ531
Type: Master's thesis
Year: 2009
Downloads: 232
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Abstract


The ash fusion temperature and ash viscosity is an important parameter of the Texaco gasification process slagging. The Huainan coal resource-rich, high ash fusion temperature (most the FT gt; 1500 ° C), can not be used directly for the Texaco Gasification Process. Thus-depth study of the behavior of ash in a reducing atmosphere, is of great significance to the judgments of different coal gasification process adaptability. This thesis is to be reduced by blending and adding flux ash melting temperature, to improve ash viscosity-temperature characteristics, ash fusion process research and XRD analysis of the mineral composition of the ash after adding flux changes, study the blending and add flux the CWS performance, while using Aspen Plus software simulation of the application of the Huainan coal in the Texaco gasification process. The results showed that: (1) blending and adding flux can effectively reduce the ash melting temperature. Add single flux need to add a large amount; blending in with the amount of the Huainan coal gt; 50% can not meet the requirements of the Texaco slagging; combination of coal blending and adding flux, can add lt; Huainan coal (coal-based) flux increase with income amounted to 50%. (2) the Huainan Coal crystal mineral kaolinite clay minerals and quartz-based higher kaolinite content the Huainan coal, ash melting temperature higher; ash melting process, the formation of mullite the main reason for the high ash melting temperature. Adding flux, the destruction of the structure of the coal ash aluminum silicate, inhibits the generation of high temperature mullite, anorthite, fayalite low melting point mineral content gradually increased with ash in quartz and other minerals occurs at high temperatures, low temperature eutectic phenomenon, the formation of a low melting point co-crystal, and thus play the role of reducing the ash fusion temperature. (3) add a flux of Huainan coal pulping properties not usually does not cause the slurry viscosity significantly increased stability and fluidity. However, with the increase in the amount of L1 coal fit into, the fluidity of the slurry is significantly worse, syneresis rate increases, stability decreases, the slurry viscosity increases. (4) adding flux can effectively reduce the the Huainan coal ash viscosity, its the cinders type near vitreous slag long slag, growth within the operating temperature range in the gasifier. (5) Aspen Plus software simulation results and the actual production values ??obtained to verify the reliability of the system model. Analysis, adding flux and blending can reduce the gasification process oxygen consumption, help to save energy consumption. Oxygen-coal ratio and coal concentration is the main factor to affect the gasifier outlet gas composition. The basic research of this thesis is to select suitable coal slagging for Texaco gasification.

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CLC: > Industrial Technology > Chemical Industry > Processing and utilization of coal chemical and coal > The nature and determination of coal
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