高含盐有机废液滚筒喷雾预浓缩优化
Optimization for drum spray preconcentration of high-salt organic wastewater
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摘要: 滚筒喷雾预浓缩装置具有传热效率高，抗结垢能力强等特点，特别适合于对高含盐有机废液进行浓缩预处理。利用自行搭建的滚筒喷雾预浓缩实验装置研究影响高含盐有机废液预浓缩效果的工况参数，在保证预浓缩盐与刮刀正常分离的条件下达到最小能耗比的目标。首先，基于单因素及正交实验结果，确定导热油温、滚筒转速、NaCl质量分数、进料COD为影响因子。随后以含水率及能耗比为响应值，通过Box-Behnken 响应面分析法（BBD）设计实验，建立二次多项式回归方程模型。最后综合分析回归方程模型各项参数，各因素及相互作用对含水率及能耗比的影响，调整后预期最佳条件：导热油温为180 ℃、滚筒转速为1.00 r·min-1、NaCl质量分数9%、进料COD 80 000 mg·L-1，验证结果显示所建预测模型均具有良好的拟合度、可信度及精密度。Abstract: The drum spray preconcentration device is characterized as high heat transfer efficiency and strong anti scaling ability, which is especially suitable for concentration pretreatment of high-salt organic wastewater. In this study, a self-made experimental device of drum spray preconcentration was used to investigate the working conditions which could influence the high-salt organic wastewater preconcentration effect. The goal of minimum energy consumption ratio could be achieved under the condition of ensuring the normal separation of preconcentration salt and scraper. First of all, based on the results of single factor and orthogonal experiments, conduction oil temperature, roller rotating speed, NaCl thickness and material COD were determined as impact factors. Then, the water content and energy consumption ratio were taken as the response values, a model of quadratic polynomial regression equation was established successfully through the results of the designed experiments using Box-Behnken design (BBD) matrix in response surface methodology. Finally, the effects of the parameters, factors and their interactions of regression equation model on water content and energy consumption ratio were comprehensively analyzed. The optimum conditions were determined as follows: 180 ℃ of conduction oil temperature, 1.00 r·min-1 of roller rotating speed, 9% NaCl thickness and 80 000 mg·L-1 of material COD. The results showed that prediction model have a good degree of fitting, reliability and precision.
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Key words:
- high-salt organic wastewater /
- drum spray /
- preconcentration /
- response surface method
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