生活污泥化学链燃烧特性实验研究

论文总字数：23909字

摘 要

在用赤铁矿作为载氧体的生活污泥化学链燃烧实验的基础之上，尝试用氧化铜修饰赤铁矿来提高载氧体的反应活性。实验在单流化床上进行，研究了添加氧化铜的污泥化学链燃烧特性，考察了几种不同的条件下，污泥CLC燃烧特性。结果表明，在特定实验工况下，赤铁矿添加氧化铜后，出口的未燃气体浓度有所下降，碳转化率有所提高，还原性气体CO，H₂以及CH₄的氧化速率有不同程度的提高，并且，添加氧化铜之后，有利于污泥CLC燃烧反应速率的提高。通过进一步研究10%，20%，30%，40%组分的氧化铜-赤铁矿载氧体，在900°C与950°C两种不同温度下，以及在0%水蒸气含量与30%水蒸气含量这两种不同条件下的反应特性，来找到它们各自对于反应结果的影响。发现，温度的升高，污泥中C的转化提高，水蒸气含量的增加，同样有利于提高碳转化率，而载氧体中氧化铜的量增加，可以提高污泥CLC燃烧的碳转化率。虽然在一些特殊工况下，相比较于未添加氧化铜时，出现不利于污泥化学链燃烧的情况，但就总体而言，添加氧化铜优化了污泥的CLC燃烧特性。

关键词： 化学链燃烧；污泥；赤铁矿；氧化铜

Chemical looping combustion of sewage sludge

BAO Jiapeng

(School of Energy and Environment，Southeast University，Nanjing 210096，China)

Abstract：Chemical looping combustion (CLC) for sewage sludge has a relatively low efficiency using hematite as oxygen carrier. The experiments on improving the reactivity of hematite with copper oxide modified for CLC of sewage sludge in a single fluidized bed reactor were carried out. Compared to hematite oxygen carrier，the concentrations of unconverted combustible gas rapidly decrease when the copper oxide-hematite is used. Moreover, both carbon conversion and combustion efficiency increase when the copper oxide is added. Our further researches of how the oxygen carrier perform when we change the amount of copper oxide, steam and temperature give us more confidence to believe that the copper oxide-hematite is a relatively good oxygen carrier . The results show that when the amount of copper oxide increased, both carbon conversion and combustion efficiency increase. Same results we get when we change the steam for 0% to 30% and enhance the temperature from 900°C to 950°C. Compared to hematite oxygen carrier, although under extreme operating mode, there are some results don’t feed our expectation, both carbon conversion and combustion efficiency increase for most cases.

Key words：chemical looping combustion；sewage sludge；hematite；copper oxide

目 录

摘 要...................................................................................................................................1

Abstract...................................................................................................................................1

目 录...................................................................................................................................2

第 一 章 绪论.......................................................................................................................3

1.1 引言 .............................................................................................................................3

1.2 污泥来源........................................................................................................................3

1.3 化学链燃烧技术............................................................................................................5

1.4 本文研究目的和主要研究内容 ..................................................................................12

第 二 章 实验部分.............................................................................................................14

2.1 引言 ...........................................................................................................................14

2.2 实验材料 ....................................................................................................................14

2.3 实验系统 ....................................................................................................................15

2.4 实验步骤和工况 ........................................................................................................16

2.5 数据评估 ....................................................................................................................17

第 三 章 实验结果及讨论..................................................................................................19

3.1 变温度对污泥CLC过程的影响.....................................................................................19

3.2 变氧化铜的量对污泥CLC过程的影响..........................................................................21

3.3 变水蒸气含量对污泥CLC过程的影响..........................................................................23

第 四 章 全文总结及展望.................................................................................................26

致 谢.................................................................................................................................27

参考文献 ...............................................................................................................................27

第一章 绪论

剩余内容已隐藏，请支付后下载全文，论文总字数：23909字