[1]梁洋,牛艳青,雷雨,等.水蒸气对合成焦燃烧过程中SiO2内含物气化挥发及PM生成特性的影响[J].西安交通大学学报,2020,54(08):035-43.[doi:10.7652/xjtuxb202008005]
 LIANG Yang,NIU Yanqing,LEI Yu,et al.Influence of Steam on the Volatilization of SiO2 and PM Formation Characteristics During Synthetic Char Combustion[J].Journal of Xi'an Jiaotong University,2020,54(08):035-43.[doi:10.7652/xjtuxb202008005]
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水蒸气对合成焦燃烧过程中SiO2内含物气化挥发及PM生成特性的影响
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《西安交通大学学报》[ISSN:0253-987X/CN:61-1069/T]

卷:
54
期数:
2020年第08期
页码:
035-43
栏目:
出版日期:
2020-08-10

文章信息/Info

Title:
Influence of Steam on the Volatilization of SiO2 and PM Formation Characteristics During Synthetic Char Combustion
文章编号:
0253-987X(2020)08-0035-09
作者:
梁洋 牛艳青 雷雨 刘思琪 惠世恩
西安交通大学能源与动力工程学院, 710049, 西安
Author(s):
LIANG Yang NIU Yanqing LEI Yu LIU Siqi HUI Shien
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
关键词:
合成焦燃烧 二氧化硅 矿物质挥发 超细颗粒物
Keywords:
synthetic char combustion silica mineral volatilization ultrafine particles
分类号:
TK16
DOI:
10.7652/xjtuxb202008005
文献标志码:
A
摘要:
为了综合分析温度和水蒸气含量对煤焦燃烧过程中二氧化硅(SiO2)气化挥发以及超细模态颗粒物(PM)生成特性的影响,利用高温管式沉降炉在1 400、1 800 K的温度下模拟空气气氛(21% O2+79% N2),并分别加入体积分数为0%、5%、10%、20%、30%的水蒸气,进行合成煤焦燃烧实验。利用荷电低压撞击器(ELPI+)测得合成焦燃烧产物中PM的数量及质量浓度,并通过数量气化因子和气化率对SiO2气化挥发特性进行定量分析。研究表明:在各个实验工况下,超细PM的数量浓度占PM10数量浓度的比例达到99%以上,质量浓度占PM10质量浓度的比例不足1%; 燃烧温度和水蒸气对SiO2气化的影响效果明显,在1 400 K燃烧温度下,超细PM的累计数量浓度随着水蒸气的加入先减小后增大,累计质量浓度随水蒸气的加入而减小; 在1 800 K燃烧温度下,超细PM累计数量浓度和累计质量浓度均随水蒸气体积分数的提高而递增,1 800 K、30% H2O时,合成焦中SiO2的数量气化因子和气化率均达到最大值,分别为7.95×1010/mg和0.95%。研究揭示了煤焦燃烧过程中超细PM生成及数量浓度与质量浓度的粒径分布关系,为高效降低燃煤过程中超细模态PM的排放量提供了理论依据。
Abstract:
A combustion experiment of synthetic char is conducted in a high-temperature drop tube furnace at 1 400 K, 1 800 K in the 21% O2+79% N2 atmosphere with volume fractions of steam of 0%, 5%, 10%, 20% and 30%. The purpose is to comprehensively analyze the influences of temperature and steam content on the gasification and volatilization characteristics of silica(SiO2)and the formation characteristics of ultrafine particulate matter(PM)in the process of coal char combustion. The quantity and mass concentration of ultrafine PM in the combustion products of synthetic char are measured by ELPI+, and the gasification characteristics of SiO2 are quantitatively analyzed by using gasification factor and gasification rate. Results show that under various experimental conditions, the proportion of ultrafine PM in PM10 is more than 99%, and the mass concentration of ultrafine PM accounts for less than 1% of that of PM10. Combustion temperature and steam content have significant influence on the gasification and volatilization of SiO2. At 1 400 K, the cumulative quantity concentration of ultrafine PM first decreases and then increases with the addition of steam, and the cumulative mass concentration decreases with the addition of steam. At 1 800 K, both the cumulative quantity concentration and cumulative mass concentration of ultrafine PM increase with the increase of volume fraction of steam. At 1 800 K and 30% steam, the maximum of gasification factor and gasification rate of SiO2 of synthetic char are reached, and their values are 7.95×1010/mg and 0.95%, respectively. This study reveale the formation of ultrafine PM and the relationship between its quantity concentration and mass concentration during the combustion process. A theoretical foundation for reducing the emission of ultrafine PM in coal combustion process is provided.

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备注/Memo

备注/Memo:
收稿日期: 2020-01-03。作者简介: 梁洋(1994—),女,硕士生; 牛艳青(通信作者),男,副教授。基金项目: 国家自然科学基金资助项目(51776161)。
更新日期/Last Update: 2020-08-10