两段式生长管中过饱和环境特征研究

发布时间：2018-02-27 07:47

本文关键词： 细颗粒物两段式生长管过饱和度传热传质整段式生长管构建过饱和方式　出处：《中国电机工程学报》2016年16期 　论文类型：期刊论文

【摘要】：利用变物性参数的传热传质模型对两段式生长管中2种构建过饱和环境方式,即低温饱和烟气与高温热水相接触后再与低温冷水接触(方式1)和高温含湿气体与低温冷水相接触后再与高温热水接触(方式2)形成的过饱和度分布进行了计算,分析了不同构建方式下形成的过饱和环境特征。结果表明:两段式生长管中第一段和第二段长度的最佳选取受构建方式、温差等因素的影响;与整段式生长管相比两段式生长管中各构建方式各径向处过饱和度得到提高,且构建方式1下过饱和度提高更明显;随着进气流速、压力的增加,方式1所得过饱和度增加,方式2所得过饱和度先增大但在较高流速或较大压力下有所降低。
[Abstract]:By using the heat and mass transfer model with variable physical parameters, two kinds of supersaturated environment in two-stage growth tube were constructed. The distribution of supersaturation formed after contact with hot water at low temperature and then with cold water at low temperature (mode 1) and with cold water at high temperature after contact with wet gas at high temperature (mode 2) was calculated. The characteristics of supersaturated environment formed under different construction modes were analyzed. The results showed that the optimum selection of the first and second segments length of the two-stage growth tube was affected by the factors such as the construction mode and the temperature difference. Compared with the whole growth tube, the supersaturation of each construction mode in the two-stage growth tube was increased, and the supersaturation increased more obviously under the construction mode 1, and the supersaturation increased with the increase of inlet gas velocity and pressure. In mode 2, the supersaturation increases first, but decreases at higher velocity or higher pressure.
【作者单位】：东南大学能源热转换及其过程测控教育部重点实验室;
【基金】：国家重点基础研究发展计划项目(973计划)项目(2013CB228504) 国家自然科学基金资助项目(51576043)~~
【分类号】：X701

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