摘 要

随着人类对于能源的不断开展与利用，我国能源总量日益减少，能源消耗日益增加，直接导致我国环境因为氮氧化物跟硫氧化物排放的增加而恶化，于是人们开始思考如何解决湿法脱硫技术中用来提高烟气扩散技术解决烟道烟囱腐蚀问题并进一步节约能源燃料保护环境。起初人们研究出了GGH技术，在运用这个技术的时候，发现GGH技术存在着一定的弊端，需要进一步改进，因此人们又创造了MGGH技术，得到了广泛使用。本文介绍MGGH技术在国内外的现状及现有发展状态，简要介绍了现在余热回收的设备的特点。锅炉的MGGH技术主要是余热回收跟再热回收两种装置中，利用MGGH技术来回收原烟气热量加热脱硫后净烟气解决烟道和烟囱腐蚀，提高烟气扩散的目的，对于MGGH技术现有的优点跟缺点进行了列举，并详细分点陈述各优缺点。

本文选定参数，结合课本及各种与MGGH相关的文献，设计了110吨锅炉MGGH技术种的余热回收装置，包括热力计算、结构计算、阻力计算等方面的内容，将锅炉排烟温度从140℃降到95℃，42吨/时工质热煤水从73℃加热到112℃供MGGH系统内的再热装置加热净烟气。整个换热器采用管长为3m的H型翅片管由烟气横向冲刷，烟气与工质流向为逆流，迎风管排的管子数为32根，纵深管排数34排，实际管子一共1088根。最后，本文对MGGH技术的前景表示看好，希望该技术可以得到人们的充分利用，从而达到既要金山银山也是青山绿水的目的。

关键词：锅炉 MGGH技术 余热回收 节能

MGGH technology waste heat recovery unit of 110 ton boiler

ABSTRACT

With the constant development and utilization of energy by humans, China’s total energy consumption has been rising, and energy consumption has increased. As a direct result of the deterioration of China’s environment due to the increase in nitrogen oxides and sulfur oxides emissions, people began to think about how to solve the problem of flue gas diffusion technology to improve flue gas diffusion technology . And further save energy fuel to protect the environment.At first, people developed GGH technology. When using this technology, they discovered that GGH technology has certain drawbacks and needs further improvement. Therefore, people have also created MGGH technology and have been widely used.Firstly, this paper introduces the status quo of MGGH technology at home and abroad and the existing development status, and introduces the characteristics of the equipment and MGGH technology briefly.The MGGH technology of the boiler is mainly used in the two devices of waste heat recovery and reheat recovery, the use of MGGH technology to recover the heat of the original flue gas heating desulfurization net flue gas to solve the flue and chimney corrosion to achieve the purpose of improving the spread of smoke,.Secondly, this article for MGGH technology advantages and disadvantages of the existing list, and the advantages and disadvantages are stated in detail.

This article selected parameters, combined with textbooks and various MGGH related literature, the design of 110 tons of boiler technology MGGH waste heat recovery unit, including thermodynamic calculation, structure calculation, the content of the resistance calculation, etc. The boiler flue gas temperature was reduced from 140°C to 95°C, and 42 tons/hour of hot coal water was heated from 73°C to 112°C for reheating the net flue gas in the MGGH system. and a tube length of 3m. The H-shaped fin tube is flushed horizontally by the flue gas, and the flow direction of the flue gas and the working fluid is countercurrent. The number of tubes in the upwind tube row is 32, and the number of rows in the depth tube is 34 rows. The total number

of actual tubes is 1,088. In the end, this paper is optimistic about the future of MGGH technology, and hopes that the technology can be full

utilized by people, so as to achieve the goal of both money and environment.

Key words:Boiler；MGGH Technology Waste Heat Recovery；Energy Saving

目 录

摘要 Ⅰ

ABSTRACT Ⅱ

第一章 绪论 1

1.1 项目背景 1

1.2 国内外工业利用现状 1

1.3 现有技术简介 2

1.3.1　余热回收装置 2

1.3.2　余热回收装置组成 2

1.3.3 MGGH技术特点....................................................................................2

1.3.4 MGGH在运行中存在的问题................................................................3

1.4未来发展方向 4

1.5 小节 4

第二章 110吨锅炉MGGH技术余热回收装置设计 5

2.1初始参数 5

2.2燃烧计算 6

2.2.1理论空气量及理论烟气容积 6

2.2.2空气平衡表 7

2.2.3焓温表 8

2.2.4实际烟气量及烟气成分 9

2.2.5烟气物性表.............................................................................................9

2.3锅炉热平衡及燃料消耗计算.... 12

2.4余热回收装置热平衡计算 14

2.4.1计算原始数据 14

2.4.2热煤水流量计算.................................................................................15

2.4.3热平衡计算.........................................................................................15

2.5 余热回收装置热力计算及结构计算.. .16

2.5.1 原始数据............................................................................................16

2.5.2 翅片管选用及数据............................................................................17

2.5.3 管子排布............................................................................................18

2.5.4 烟气换热系数....................................................................................20

2.5.5 热煤水换热系数................................................................................21

2.5.6 总传热系数及管排数........................................................................22

2.5.7阻力计算 .23

2.5.8换热管壁厚的强度计算.....................................................................24

第三章 结果与展望 25

3.1设计结果.. 25

3.2未来展望 25

参考文献 26

致谢 26

1. 绪 论

1.1项目背景

随着我国对能源，环境方面的要求不断提高，各种燃煤机组需要不断减少锅炉烟气污染物的排放，这样才可以达到日益严格的排放指标。因此，燃煤发电厂超低排放(MGGH)概念逐渐得到了工业人员的认可。我国工业余热总资源占国内燃料消耗总量的五分之一到三分之一不等，锅炉回收利用和烟气中水蒸气凝结潜热的潜能很大，但是一般空气预热器跟省煤器只能回收部分热量，仍然有大部分热量未被充分利用，但是如果排烟温度降低，理论烟气可回收热量与锅炉理论热销路将有进一步的增加。所以利用MGGH技术回收烟气余热，能够有效提高资源的利用率，提高锅炉企业的经济效益，值得人们大力提倡。

1.2 国内外工业利用现状