增压富氧燃烧烟气非灰辐射传热特性研究

论文总字数：32750字

摘 要

随着工业应用对计算精度的逐渐提高，灰体烟气气体模型逐渐无法满足要求，为了更准确地计算其在富氧增压工况下的性质，必须研究灰体烟气气体模型。

本文使用基于HITRAN2012数据库逐线法作为计算组，窄谱带模型作为参照组，计算了富氧燃烧烟气在增压条件下的辐射特性和辐射传热特性，并与各种工况下的计算数据进行了比较。对一维平板下的非灰烟气在不同压力，行程长，MR，和温度下的辐射特性进行了计算，再通过辐射特性进一步计算辐射传热特性，就结果讨论了不同因素尤其是压力对非灰烟气辐射特性的影响。最后计算了空气燃烧烟气和增压富氧燃烧烟气的实际算例。结果显示非灰烟气气体模型使用逐线法计算具有足够的精度，富氧燃烧的烟气辐射热流大于空气燃烧烟气辐射热流，并且增压运行可以增加烟气密度，烟气再循环的过程有利于CO₂产物的减排和捕集，压力升高还会使发生离解、电子跃迁和电离的几率更高。另外，还对之后模型的三维改进和流化床炉方面应用做出了展望。

关键字：逐线法，窄谱带模型，增压富氧燃烧，辐射特性，辐射传热特性

Abstract

With the gradual improvement of calculation accuracy in industrial application, the gray flue gas model can not meet the requirements gradually. In order to more accurately calculate its properties under oxy-fuel supercharging conditions, it is necessary to study the gray flue gas models.

In this paper, the radiation characteristics and radiation heat transfer characteristics of oxy-fuel combustion flue gas under high pressure conditions are calculated by using the line-by-line method based on HITRAN2012 database as the calculation group and the narrow band model as the reference group, and compared with the calculated data under various working conditions. The radiation characteristics of non-gray flue gas under one-dimensional plate under different pressure, travel length, MR, and temperature are calculated, and then the radiation heat transfer characteristics are further calculated by radiation characteristics. The effects of different factors, especially pressure, on the radiation characteristics of non-gray flue gas are discussed. Finally, the practical examples of air-fuel combustion flue gas and pressurized oxy-fuel combustion flue gas are calculated. It is shown that the calculation of non-gray flue gas model by line-by-line method is accurate enough, the radiative heat flow of oxy-fuel combustion is larger than that of air-fuel combustion flue gas, and the charging pressure operation can increase the density of flue gas. The process of flue gas recycling is beneficial to the emission reduction and trapping of CO₂ products, and the increase of pressure will also make the molecules have a higher probability of transition and ionization. In addition, the three-dimensional improvement of the model and the application of fluidized bed furnace are also prospected.

KEY WORDS: line-by-line method, narrow band model, pressurized oxy-fuel combustion, radiation characteristic, radiation heat transfer characteristic

目 录

第一章 绪论 4

1.1本文研究背景及目的 4

1.1.1本文研究背景 4

1.1.2本文研究目的 5

1.2国内外研究现状和发展趋势 6

1.2.1国内研究现状 6

1.2.2 国外研究现状 8

1.3本文研究内容和方法 9

第二章 气体辐射传热计算模型 10

2.1模型简介 10

2.1.1窄谱带模型 10

2.1.2 逐线法模型 11

2.1.3 离散坐标法 12

2.2 气体辐射模型评价 15

第三章 增压富氧烟气的辐射特性计算 16

3.1相同压力下发射率随行程变化的发射率计算 16

3.2相同行程下发射率随压力变化的发射率计算 18

3.3增压条件下吸收系数沿波数的分布 20

3.4富氧燃烧和空气燃烧工况的计算 22

3.5 实际案例中富氧燃烧增压运行的辐射特性计算 23

第四章 增压富氧烟气的辐射传热特性 25

4.1 等温均匀分布烟气辐射传热特性 26

4.2 非等温均匀分布烟气辐射传热特性 29

4.3 富氧燃烧烟气和空气燃烧烟气的辐射传热特性 31

4.4 增压富氧燃烧烟气的辐射传热特性 32

第五章 总结和展望 34

参考文献 35

致 谢 38

1. 绪论

1.1本文研究背景及目的

剩余内容已隐藏，请支付后下载全文，论文总字数：32750字