Deposit formation on a single cylinder during combustion of herbaceous biomass

被引:38
作者
Kaufmann, H
Nussbaumer, T [1 ]
Baxter, L
Yang, N
机构
[1] ETH Zurich, Swiss Fed Inst Technol, CH-8092 Zurich, Switzerland
[2] Verenum Res, CH-8006 Zurich, Switzerland
[3] Sandia Natl Labs, Livermore, CA 94551 USA
关键词
biomass combustion; deposit; aerosol; particle; particle size; thermophoresis;
D O I
10.1016/S0016-2361(99)00137-4
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The combustion of herbaceous biomass can lead to deposit formation on the walls of the combustion chamber and on boiler tubes. These deposits are being caused by fly ash. The aim of the present investigation was to identify the mechanisms of deposit formation, to analyse the chemical and morphological properties of the deposit, and to propose measures for deposit reduction. Special attention was given to the deposit formation from flue gas having been cleaned from large particles. It is typically found in boilers from moving bed furnaces. Experiments were performed in the flue gas of a turbulent flow reactor by sampling the depositions on a cooled cylinder after having removed large particles on an obstacle. Furthermore, depositions from the boilers of two moving bed furnaces were collected. The investigations show that depositions similar to those in moving bed furnaces were achieved in the turbulent flow reactor when large particles were removed before sampling. The deposits from herbaceous biomass were identified as accumulations of fine particles in the nanometer range. The chemical properties of the deposits are those of KCI, the major compound in the deposit. Among the different formation mechanisms thermophoresis was revealed to be the crucial process for deposit formation under the investigated conditions. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:141 / 151
页数:11
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