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基于Chemkin的煤热解多步反应机理的改进煤热解是煤气化、焦化等过程中的必经步骤。现阶段，煤热解技术主要用于生产二次清洁能源，提高燃料品质，既能够避免直接燃煤所产生的环境污染，又能更好利用煤中蕴含的较高热值化合物，具有保护环境、节约能源和充分利用煤炭资源的普遍意义。煤热解是极其复杂的物理、化学联合反应，受到煤阶，热解温度，加热速率，煤样的粒度，环境压力，气氛等因素的影响。现有的许多热解模型存在精度低，适用范围窄，过于复杂等的问题。因此设计开发出一种相对简单、准确的热解动力学模型尤为必要。本文基于煤热解多步反应机理，通过对原热解机理进行改进，使之可以适用于Chemkin软件。计算结果表明，改进后的煤热解模型与原模型计算结果较为吻合，与实验结果也较为接近。改进后的煤热解模型可广泛应用于煤化工、发电等方面的计算。26771
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关键词 煤热解 动力学模型 Chemkin软件
毕业论文设计说明书外文摘要
Title Improvement of multi-step kinetic model of
coal devolatilization based on Chemkin software
Abstract
Devolatilization is the key step in coal combustion, gasification, liquefaction and coking. Today, coal devolatilization technology is mainly used in producing secondary clean-energy, improving fuel quality. It can not only reduce environmental pollution caused by burning coal, but also take all use of compounds of higher economic value contained in coal, with the wide implications of environmental protection, energy saving and rational utilization of coal resources. Coal devolatilization is a very complex result of the combined effects of physical reactions and chemical reactions, affected by coal rank, pyrolysis temperature, heating rate, particle size, pyrolysis pressure and air atmosphere et. Many existing pyrolysis models have low accuracy, narrow range of application, and too complicated problems. Therefore, it is necessary to design a relatively simple and accurate pyrolysis kinetic model. In this paper, the main idea is improving the multi-step model of coal devolatization, so that it can be used by Chemkin software. The result shows that the improved coal pyrolysis model is in good agreement with the calculation results of the original model, and is also close to the experimental results. The improved coal pyrolysis model can be widely used in coal chemical engineering, power generation and so on.
Keywords Coal pyrolysis model of coal pyrolysis Chemkin
目录
1 绪论 1
1.1 背景 1
1.2 煤热解 1
1.3 影响因素 2
1.3.1 煤化程度 2
1.3.2 温度 2
1.3.3 加热速率 2
1.3.4 压力 2
1.3.5 颗粒粒度 3
1.4 煤热解反应动力学模型 3
1.4.1 早期模型 3
1.4.2 基于结构的网络模型 5
1.5 研究方法 5
1.6 Chemkin简介 6
2 机理模型 7
2.1 原机理模型 7
2.2 机理模型的改进 9
2.3 Chemkin步骤与设置 11
3 结果统计与验证 17
3.1 计算煤种 17
3.2 数据处理 17
3.2.1 不同煤质的验证 17
3.2.2 Illinios煤在不同温度下的热解情况 24
3.2.3 Adaro煤热解产物TAR和CHAR的元素分析 26
结 论 27
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