摘 要

燃烧技术在工业生产中一直处于非常重要的地位。燃烧技术的出现，立刻改写了人类的生产方式，并极大地提高了工业生产中的生产效率，为文明的快速发展贡献了极大的力量。

随着燃烧技术的发展，人们对燃烧的要求不再是能安全点燃，平稳燃烧，达到要求的工作温度即可，而是能够高效，清洁，低排放，利用率高的优秀燃烧模式，人们也慢慢对燃烧这个过程有了更加深刻的认识与理解，对燃烧本质的理解和燃烧的控制上也是慢慢开始积累了一定的经验。

上世纪七八十年代，人们为了提高燃烧技术的燃烧效率，提出了名为蓄热式燃烧的燃烧技术，这一燃烧技术极大的提高了燃烧的热能利用率，有效减少了燃料资源的损耗，但该燃烧方式的燃烧温度非常高，这也导致其排放性能受到影响。日渐严格的排放指标需求，让人们更进一步地去寻找一种更优秀的燃烧方式。

二三十年前，一种名为高温空气燃烧技术被日本学者田中一郎提出，随即在许多发达国家引起了对此项技术研究的广泛关注及研究。MILD燃烧技术便是这种技术的一个分支。作为一种新型燃烧技术，该燃烧方式有着一系列优点，例如燃烧温度场分布均匀，温度峰值低，燃烧效率高，氮氧化物等的排放性能好。所以自被提出以来，已经有许多学者进行了进一步研究，并取得了相当多的研究成果。本文在查阅相关资料，对MILD燃烧技术进行了一定的了解之后，以IFRF的0.58MW锅炉为原型，利用fluent等软件，在对其实际用途进行考量后，初步设定基础参数，然后进行燃烧模型的构建，再提出一些有关优化方案的设想，进行了一系列的探讨和尝试后，最终设计了一款以甲烷为燃料的MILD燃烧器，该燃烧器拟用于钢厂加热炉。

关键词：MILD燃烧，甲烷，燃烧器，温度场

Abstract

Combustion technology has always been in a very important position in industrial production. The emergence of combustion technology has rewritten the mode of human production, greatly improved the production power in industrial production, and contributed a great deal to the rapid development of civilization.

With the development of combustion technology, people's requirements for combustion are no longer safe ignition, stable combustion, and reaching the required operating temperature, but an excellent combustion mode with high efficiency, cleanness, low emission and high utilization rate. People have gradually gained a deeper understanding and understanding of the combustion process, and gradually began to accumulate the essence and control of combustion Some experience.

In the 1970s and 1980s, in order to improve the combustion efficiency of combustion technology, people put forward a combustion technology called regenerative combustion. This combustion technology greatly improves the utilization rate of combustion heat energy and effectively reduces the loss of fuel resources, but the combustion temperature of this combustion mode is very high, which also affects its emission performance. With the increasingly strict demand for emission indicators, people will go further to find a better combustion mode.

So two or three decades ago, a kind of high temperature air combustion technology was proposed by Japanese scholar Ichiro Tanaka, and then it attracted extensive attention and research in many developed countries. MILD combustion technology is a branch of this technology. As a new combustion technology, the combustion mode has a series of advantages, such as uniform distribution of combustion temperature field, low temperature peak value, high combustion efficiency and good emission performance of nitrogen oxides. Therefore, since it was put forward, many scholars have carried out further research and achieved quite a lot of research results. In this paper, after consulting the relevant materials and understanding the MILD combustion technology, taking IFRF 0.58mw boiler as the prototype, using fluent and

other software, after considering the purpose, from the determination of basic parameters, to the construction of combustion model, the adjustment of fuel nozzle position, and whether to set a pre-combustion chamber, etc., a series of discussions and attempts are made. After that, a series of A MILD burner with methane as fuel is designed. The burner is intended to be used in heating furnace of steel plant.

Key words：MILD burn，methane，burner，temperature field

目录

摘要 - I -

Abstract - II -

第1章 绪论 - 1 -

1．1引言 - 1 -

1.2关于MILD燃烧技术的发展历程 - 2 -

1.3本文主要内容 - 3 -

第2章 基于ANSYS的燃烧数值模拟 - 5 -

2.1IFRF锅炉物理模型模拟 - 5 -

2.2模型的验证 - 7 -

2.3结果分析方法 - 7 -

2.4本章小结 - 8 -

第3章 燃烧器参数的探究及确定 - 9 -

3.1燃料入射位置的影响 - 11 -

3.1.1不同条件下速度场分析 - 12 -

3.1.2不同情况下燃烧的组分分析 - 12 -

3.1.3MILD燃烧器的温度场分析 - 14 -

3.2预燃室对燃烧的影响 - 15 -

3.2.1有无预燃室情况下速度场分析 - 16 -

3.2.2有无预燃室情况下的组分分析 - 17 -

3.2.3有无预燃室时的温度场分析 - 18 -

3.3本章小结 - 19 -

第4章 结论与展望 - 20 -

4.1结论 - 20 -

4.2展望 - 20 -

参考文献 - 21 -

致谢 - 23 -

第1章 绪论

1．1引言

钢铁工业是现代最重要的基础工业之一，其发展不仅是其他工业发展的基石，也推动着其他工业的发展。钢铁工业对于我国来说也是非常重要的，自新中国成立以来，钢铁事业的发展一直得到了国家的高度重视和极力帮助，已经在全国上下范围内建立了一整套钢铁工业体系^[2]。

钢铁产业作为我们国家的支柱产业之一，在带来巨大的经济效益及钢材供应之外，同时也消耗了大量的化石燃料，这些燃料的燃烧不可避免的会带来诸多污染物如硫化物，一氧化碳，碳氢化物，氮氧化物，粉尘，酚等等，这些污染带来的危害不容小觑。而且随着社会的发展，对于人与自然的和谐共处，对环境保护的意识也越来越强，国家对这些产业的排放要求也愈发严格。所以提高能源的利用效率，降低排放污染物排放，成为了当务之急^[3]。而传统锅炉和传统燃烧模式，在环境保护和能源利用率这两方面面临着挑战。