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温度及浓度对析晶污垢沉积特性影响的模拟研究

DOI: 10.13334/j.0258-8013.pcsee.2014.35.002, PP. 6263-6270

Keywords: 壁温,入口浓度,析晶污垢,沉积特性,数值模拟

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Abstract:

对换热管内析晶污垢沉积进行了数值模拟。研究了换热管内不同温度的管壁以及不同浓度的管内流体对污垢沉积率、剥蚀率以及净沉积率的影响。在已有的析晶污垢沉积模型的基础上,结合流体传热传质方程,以自编程的方式对研究的工况进行数值模拟。结果表明,入口工质浓度及壁面温度的升高,都会引起污垢沉积量的增加,导致污垢热阻的增大。通过以上模拟结果发现,入口浓度和壁温的变化直接引起流体内部析晶污垢溶质溶解度的变化。当溶液的浓度和温度达到饱和溶液状态附近时,污垢沉积量变化将会比较小。并且污垢沉积的变化率并不是单调的,而是浓度达到饱和浓度时,单调性会发生改变。

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