Influence of Steam on the Volatilization of SiO2 and PM Formation Characteristics During Synthetic Char Combustion

被引：0

作者：

Liang Y. ^{[1
]}

Niu Y. ^{[1
]}

Lei Y. ^{[1
]}

Liu S. ^{[1
]}

Hui S. ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2020年 / 54卷 / 08期

关键词：

Mineral volatilization; Silica; Synthetic char combustion; Ultrafine particles;

D O I：

10.7652/xjtuxb202008005

中图分类号：

学科分类号：

摘要：

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. © 2020, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

引用

页码：35 / 43

页数：8

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