气体燃烧过程在化学平衡问题的热力学研究..doc

气体燃烧过程中化学平衡问题的热力学研究 学 院 理学院 专 业 应用物理学 班 级 学 号 20110414020 姓 名 指导教师 负责教师 沈阳航空航天大学 2015年6月摘 要 气体燃料在工业生产和日常生活中有广泛的应用,燃料在空气中燃烧的热效应是衡量其燃烧性能好坏的重要指标。但是实际上要选择一种合适的气体燃料，不仅要考虑其燃烧放热的多少，还需要考虑到燃料燃烧的产物是否有毒或者污染环境以及其他的因素，综合分析该气体适合应用在哪些领域。本文主要研究的是碳氢气体在空气中燃烧产热问题，以甲烷、乙烯、乙烷为例来研究气体燃料燃烧的热效应与反应温度和气体浓度的关系。 本文用到的基本原理是用化学平衡法来计算气体燃烧产物的摩尔分数。本文的核心思想是用热力学软件HSC chemistry来模拟气体在空气中燃烧，作出燃烧产物与温度和气体浓度的关系图像。通过分析图像得到各气体的最佳燃烧方案，总结出一般碳氢气体的燃烧特性。得到不同气体的燃烧特性有很大的差异。其中，甲烷在浓度为7.8%,温度控制在2500K以下，是甲烷最经济环保的方案。对于乙烯和乙烷在浓度为5.5%和5.6%的时候燃烧的热效应较好，但是在温度较高的情况下，乙烯和乙烷燃烧产生的污染气体较多，并且产热不如甲烷多。所以甲烷更适合作为燃料用于工业生产等诸多领域。 关键词：化学平衡法；HSC chemistry；气体燃烧 Thermodynamic study on chemical equilibrium problem during gases combustion Abstract Gas fuels have a wide rand of applications in industrial production and daily life. The heating effect of the fuel burning in air is an important index to measure the fuel functions. Effectively, to select a kind of suitable gas fuel, we consider not only how much its heat release, we also need to take into account whether products of fuel combustion are toxic or polluting the environment and other factors. The paper main research hydrocarbon gas combustion heat in air.Methane, ethylene and ethane as example to research the relationship between heating effect of gas fuels combustion and temperature and the gas concentration. Basic principle of the article is that use the method of chemical balance to calculate mole fraction of the product after gases combustion. The core idea of this article is using thermodynamic software HSC chemistry to simulate the gases combustion in air and plotting the relation images between fuel combustion product and temperature and fuel concentration .By analyzing the images, the best combustion project of each gas and the combustion characteristic of hydrocarbon gases can be obtained. There are many differences between the combustion characteristics of different gases. It is the most economical and environmental scheme w