基于CFD的煤炭地下气化煤气泄漏安全问题研究

发布时间：2018-03-16 04:36

本文选题：煤炭地下气化　切入点：煤气泄漏　出处：《华北科技学院》2017年硕士论文　论文类型：学位论文

【摘要】：煤炭地下气化(Underground Coal Gasification,简称UCG)是世界煤炭开采的研究方向之一,是从根本上解决传统开采方法存在的一系列技术和环境问题的重要途径,是一项符合可持续发展需要的环境友好的绿色技术,必将成为我国洁净煤技术研究的重要领域。我国煤炭地下气化项目仍处于工业试验阶段,在项目开展时会面临诸多安全问题,其中煤气泄漏引发的安全问题最为突出,因此对煤气泄漏安全问题研究至关重要。本文以计算流体动力学软件(CFD)为基础,模拟分析煤气泄漏在巷道中扩散规律,在此基础上提出安全应急预防措施。本文首先对煤炭地下气化系统的组成部分,工艺流程和气化原理进行分析,通过对煤气组分进行了物理、化学性质归纳,重点分析了主要成份一氧化碳、氢气、甲烷的毒害机理。其次对整个系统进行危险性分析,确定煤气泄漏问题是煤炭地下气化应更重视的安全问题,同时对产生煤气的重点区域气化区进行易泄漏点的分析,为后续数值模拟提供数据参考;然后,分析归纳了计算流体动力学CFD的技术理论以及气体扩散方程,建立了煤气在巷道中的扩散方程。依据现场项目实际的气化区平面图和通风图,选取1#气化炉附近的巷道进行物理建模和模拟。数值模拟过程中,选取泄漏速度、通风风速等因素作为可变参数,得到了煤气的扩散的规律。最后依据模拟结果提出安全预防应急措施,可为实际煤炭地下气化项目的安全进行提供理论指导。
[Abstract]:Underground coal gasification (Coal) is one of the research directions of coal mining in the world. It is an important way to solve a series of technical and environmental problems existing in traditional mining methods. It is an environmentally friendly green technology that meets the needs of sustainable development and will certainly become an important field in the research of clean coal technology in China. The underground coal gasification project in China is still in the industrial test stage. During the development of the project, many safety problems will be faced, among which the safety problems caused by gas leakage are the most prominent, so it is very important to study the safety problems of gas leakage. This paper is based on the computational fluid dynamics software (CFDs). On the basis of simulating and analyzing the diffusion law of gas leakage in roadway, the safety emergency prevention measures are put forward. Firstly, this paper analyzes the components, technological process and gasification principle of underground coal gasification system. By summarizing the physical and chemical properties of the gas components, the toxic mechanism of the main components carbon monoxide, hydrogen and methane is emphatically analyzed. Secondly, the hazard analysis of the whole system is carried out. The problem of gas leakage is a safety problem that should be paid more attention to in underground gasification of coal. At the same time, the leakage points of the gasification area in the key area where the gas is generated are analyzed to provide data reference for the subsequent numerical simulation. The technical theory of computational fluid dynamics (CFD) and the gas diffusion equation are analyzed and summarized, and the gas diffusion equation in the roadway is established. Selecting the roadway near the 1# gasifier for physical modeling and simulation. In the process of numerical simulation, factors such as leakage velocity, ventilation speed and other factors are selected as variable parameters. Finally, according to the simulation results, the safety prevention and emergency measures are put forward, which can provide theoretical guidance for the safety of actual underground coal gasification projects.
【学位授予单位】：华北科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD84

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