ANALYSIS OF SHRINKAGE AND CRISPATION OF ORIGINAL AND LEACHED RICE HUSK AFTER INCINERATION
Shrinkage is a common phenomenon occurred in the process of thermochemical conversion of rice husk and crispation occurred attributes to the different shrinkage degrees in different positions of rice husk. They affect the bed resistance and the heat transfer characteristics of bed materials. Worse still, the larger degrees of shrinkage and crispation cause local collapse of bed materials, even affect the organization of production process. Therefore, the knowledge of mechanism and degrees of shrinkage and crispation are necessary for rational design of rice-husk-related thermochemical conversion equipments. In order to compare the different degrees and analyze the causation of shrinkage and crispation between original and leached rice husk after being incinerated, both qualitative and quantitive analysis are carried out in present study. The qualitative analysis indicates that the shrinkage is dominated in the length direction and the crispation is dominated in the width direction due to the effect of different shrinkage degrees between the internal and the external surface of rice husk, along with the effect of different thickness of rice husk papillae structures. Moreover, the larger shrinkage and crispation degrees of leached rice husk than those of original rice husk, which attributes to the removal of alkali metals and impurity particles, are observed. The quantitive analysis shows that the shrinkage and the crispation degrees of original rice husk are 11.87 ％ and 49.95 ％ respectively, however the values of leached rice husk are 14.04 ％ and 66.09 ％ respectively. The results provide valuable information on the causation and the degrees of shrinkage and crispation of original and leached rice husk, which will help optimizing the rice-husk-related producing processes in future works.
Xinzhi Liu Jianfeng Shen Shuguang Zhu Li Wang Houlei Zhang Junjie Tan
School of Power Engineering Nanjing University of Science and Technology Jiangsu, China, 210094
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
228-235
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）