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黄原胶溶液模拟消化污泥流动性能分析

曹秀芹, 袁海光, 赵振东, 丁浩

曹秀芹, 袁海光, 赵振东, 丁浩. 黄原胶溶液模拟消化污泥流动性能分析[J]. 农业工程学报, 2017, 33(15): 260-265. DOI: 10.11975/j.issn.1002-6819.2017.15.033
引用本文: 曹秀芹, 袁海光, 赵振东, 丁浩. 黄原胶溶液模拟消化污泥流动性能分析[J]. 农业工程学报, 2017, 33(15): 260-265. DOI: 10.11975/j.issn.1002-6819.2017.15.033
Cao Xiuqin, Yuan Haiguang, Zhao Zhendong, Ding Hao. Analysis on xanthan gum solution to simulate flow performance of digestion sludge[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2017, 33(15): 260-265. DOI: 10.11975/j.issn.1002-6819.2017.15.033
Citation: Cao Xiuqin, Yuan Haiguang, Zhao Zhendong, Ding Hao. Analysis on xanthan gum solution to simulate flow performance of digestion sludge[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2017, 33(15): 260-265. DOI: 10.11975/j.issn.1002-6819.2017.15.033

黄原胶溶液模拟消化污泥流动性能分析

基金项目: 北京市教委(北京市自然科学基金)科技重点项目(KZ201310016017)

Analysis on xanthan gum solution to simulate flow performance of digestion sludge

  • 摘要: 为污泥消化反应器流场的可视化研究提供可行性方法,该文根据同流体流动相似准则分别从密度和流变学特性来分析黄原胶透明溶液作为常规消化污泥相似溶液的可行性。采用质量法和流变仪分别测量不同浓度污泥和添加KCl的黄原胶溶液的密度及流变特性。结果表明15 g/L添加KCl的黄原胶溶液与95%含水率污泥在密度不具有显著性差异的前提下具有相似的流变特性,流变曲线的决定系数分别为R2=0.995 3(动力黏度)、R2=0.893 5(剪切应力),均为典型的假塑性非牛顿流体。混合试验表明2种流体中示踪剂浓度的变化规律相似且均在40 min后趋于平衡浓度50 mg/L。等同性分析表明,在显著性水平α=0.05时,2种流体中以流变特性和密度为参数的双侧t检验不具有显著性差异,符合同流体流动相似准则。故添加KCl的黄原胶溶液可以作为污泥的透明相似溶液,为污泥等不透明生物质流体厌氧消化的模拟及可视化研究奠定基础。
    Abstract: Abstract: Anaerobic digestion is a kind of sludge stabilization technology widely used at home and abroad. As an opaque non-Newtonian fluid, it is difficult to obtain the sludge flow characteristics in the digester exactly. Hence, it is necessary to find a sort of transparent fluid to replace it. To ensure the reliability of flow characteristics obtained from transparent analog fluid, it is indispensable to verify the flow similarity with main physical property of the fluid. The feasibility of xanthan gum transparent solution as a similarity solution of digestion sludge was analyzed according to the rheological property and density, respectively, based on the similarity criteria of fluid flow. Under the premise of satisfying the geometric similarity, the Reynolds criterion and the Froude criterion should be met simultaneously, that is, the Reynolds number and the Froude number of 2 kinds of fluids should be equal. The rheological parameter and density of 95% water content digestion sludge and xanthan gum solution at different concentrations were measured by rotating viscometer and gravimetric method severally. The rheological curve of 2 kinds of fluids was tested for a goodness-of-fit, and curve regression effect was characterized by the determination coefficient R2 on the principle of regression analysis. First, the xanthan gum solution of 13, 16, and 19 g/L was prepared. It was found that the rheological curves of the 16 g/L xanthan gum solution were similar to those of digestion sludge, and both of them were pseudo plastic non-Newtonian fluid, indicating that this xanthan gum solution could replace the sludge as a similarity solution. But, the xanthan gum solution's density was smaller than that of the target fluid in this recipe, which did not conform to the fluid flow similarity criteria. So, for adjusting the density disparity, xanthan gum solution of 14, 15, and 16 g/L was made by using KCl solution as the solvent instead of aqueous solution. Because of the fact that the salt screens the electrostatic repulsions of the trisaccharide side chains, the adoption of a helical backbone conformation is allowed, which in turn promotes the increased association of the ordered xanthan molecules in solution. With the addition of KCl, the rheological curves of 15 g/L xanthan gum solution were in reasonable agreement with those of digestion sludge, which were also typical pseudo-plastic non-Newtonian fluid. The determination coefficients of rheological curve of 2 kinds of fluids were R2=0.995 3 (viscosity curve) and R2=0.893 5 (shear stress curve), separately, showing the highest similarity. Tracing test of mixing performance displayed that tracer concentrations at the outlet in these 2 kinds of fluids had the same tendency with the change of time. The result of Welch's t-test demonstrated that there was no significant difference in the rheological parameter and density of the 2 kinds of fluids at the significant level of 0.05. Given above logical analysis, it should be pointed out that xanthan gum transparent solution used as a similarity solution of digestion sludge is acceptable, which can be used as a basis method for the flow visualization in the anaerobic digester. Generally, future work should focus on applying transparent similarity solution to validate computational fluid dynamics simulation from the perspective of reducing energy consumption and improving biogas yield.
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出版历程
  • 收稿日期:  2017-03-26
  • 修回日期:  2017-07-24
  • 发布日期:  2017-07-31

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