Online deposition measurement and slag bubble behavior in the reduction zone of pulverized coal staged combustion

被引：6

作者：

Chen, Denggao ^{[1
]}

Zhang, Zhi ^{[1
]}

Li, Zhenshan ^{[1
]}

Cai, Ningsheng ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Thermal Engn, Minist Educ, Key Lab Thermal Sci & Power Engn, Beijing 100084, Peoples R China

来源：

PROCEEDINGS OF THE COMBUSTION INSTITUTE | 2019年 / 37卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Ash deposition; Online deposition thermogravimetric measurement; Slag bubble; Staged combustion; ASH DEPOSITION; IN-SITU; SURFACE; GASIFICATION; TEMPERATURE; PARTICLES;

D O I：

10.1016/j.proci.2018.07.123

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

An online thermogravimetric measurement method of ash deposition was developed. Ash deposition and slag bubble in the reductive zone of pulverized coal staged combustion were investigated. Firstly, a steady pulverized coal staged combustion was achieved in an electrically heated down-fired furnace. Additionally, gas species, coal conversion, and particle size distribution were quantitatively measured. Secondly, real-time ash deposition rates at different temperatures (1100-1400 degrees C) were measured, and deposition samples were carefully collected with an N-2 protection method. The morphologies of collected samples were investigated through a scanning electron microscope. It was found that the deposited ash transformed from a porous layer composed of loosely bound particles to a solid layer formed by molten slag. Different behaviors of the slag bubble were observed, and bubble sizes were significantly affected by the deposition temperature. A deposition and bubble formation mechanism was proposed and used for modeling. Results showed that the proposed model well predicted the observed ash deposition and bubble formation process. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

引用

页码：4435 / 4442

页数：8

共 24 条

[1] Ash Deposition Behavior of Upgraded Brown Coal and Bituminous Coal [J].

Akiyama, Katsuya ;

Pak, Haeyang ;

Tada, Toshiya ;

Ueki, Yasuaki ;

Yoshiie, Ryo ;

Naruse, Ichiro .

ENERGY & FUELS, 2010, 24 (08) :4138-4143

[2]

Baker D. R., 2005, ANN GEOPHYS, V48, P4

[3] Reduction of Iron-Oxide-Carbon Composites: Part I. Estimation of the Rate Constants [J].

Halder, S. ;

Fruehan, R. J. .

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2008, 39 (06) :784-795

[4] Effect of Fuel Type and Deposition Surface Temperature on the Growth and Structure of an Ash Deposit Collected during Co-firing of Coal with Sewage Sludge and Sawdust [J].

Kupka, Tomasz ;

Zajac, Krzysztof ;

Weber, Roman .

ENERGY & FUELS, 2009, 23 (07) :3429-3436

[5] Relationship between chemical components and coal ash deposition through the DTF experiments using real-time weight measurement system [J].

Namkung, Hueon ;

Xu, Li-Hua ;

Lin, Kuangfei ;

Yu, Guangsuo ;

Kim, Hyung-Taek .

FUEL PROCESSING TECHNOLOGY, 2017, 158 :206-217

[6] Waterwall corrosion mechanisms in coal combustion environments [J].

Nava-Paz, JC ;

Plumley, AL ;

Chow, OK ;

Chen, W .

MATERIALS AT HIGH TEMPERATURES, 2002, 19 (03) :127-137

[7]

Robinson AL, 1998, TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2, P1727

[8] CONCENTRATIONS AND BEHAVIOR OF OXYGEN AND OXIDE ION IN MELTS OF COMPOSITION CAO.MGO.XSIO2 [J].

SEMKOW, KW ;

HASKIN, LA .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1985, 49 (09) :1897-1908

[9] VISCOSITY OF ASH PARTICLES IN COMBUSTION SYSTEMS FOR PREDICTION OF PARTICLE STICKING [J].

SENIOR, CL ;

SRINIVASACHAR, S .

ENERGY & FUELS, 1995, 9 (02) :277-283

[10] In situ study on the formation mechanism of bubbles during the reaction of captured chars on molten slag surface [J].

Shen, Zhongjie ;

Liang, Qinfeng ;

Xu, Jianliang ;

Liu, Haifeng .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2016, 95 :517-524

← 1 2 3 →