CAJ | 학술논문

为了确定较优的污泥过热蒸汽干燥工艺参数，搭建了常压过热蒸汽干燥试验台，选取相对单位能耗和平均干燥强度为评价指标，采用三因素二次正交旋转组合试验设计，建立了污泥过热蒸汽干燥工艺参数评价指标与过热蒸汽温度、污泥质量和过热蒸汽流量之间的数学模型。通过试验数据分析表明：建立的相对单位能耗和平均干燥强度回归方程决定系数R2分别为0.842和0.797；3个因子对2个评价指标影响大小的顺序均为：污泥质量>蒸汽流量>蒸汽温度；污泥过热蒸汽干燥相对单位能耗最优工艺条件为：蒸汽温度为215℃，污泥质量为26 g（厚度约为8 mm），蒸汽流量为30 m3/h，在此条件下相对单位能耗预测值为281.313 kJ/g，验证试验得到实际相对单位能耗为280 kJ/g，相对误差为0.467%。该试验结果可为污泥过热蒸汽干燥工艺参数优化及干燥设备研制提供参考。
위료학정교우적오니과열증기간조공예삼수，탑건료상압과열증기간조시험태，선취상대단위능모화평균간조강도위평개지표，채용삼인소이차정교선전조합시험설계，건립료오니과열증기간조공예삼수평개지표여과열증기온도、오니질량화과열증기류량지간적수학모형。통과시험수거분석표명：건립적상대단위능모화평균간조강도회귀방정결정계수R2분별위0.842화0.797；3개인자대2개평개지표영향대소적순서균위：오니질량>증기류량>증기온도；오니과열증기간조상대단위능모최우공예조건위：증기온도위215℃，오니질량위26 g（후도약위8 mm），증기류량위30 m3/h，재차조건하상대단위능모예측치위281.313 kJ/g，험증시험득도실제상대단위능모위280 kJ/g，상대오차위0.467%。해시험결과가위오니과열증기간조공예삼수우화급간조설비연제제공삼고。
The sludge is known as the byproduct generated in the process of pollution control. It is featured by the high moisture content, complicated components and massive deadly microorganism, thus easily leading to secondary pollution. The dehydration is a necessary process to realize the sludge harmless reduce the sludge amount and improve the resource utilization. The thermal drying is a feasible method to reduce the moisture content. The process of hot air drying will cause a large amount of harmful exhaust gas, adding to the difficulty and cost of controlling exhaust gas. The sludge drying, which uses superheated steam as the drying medium, will further lower the risk of explosion and reduce the harmful gas account due to the absence of oxygen in the drying medium. However, the superheated steam drying of sludge is also faced with the problems such as energy consumption and long drying time. Hence, it has become a major task to dry the sludge in an economic and effective manner. The purpose of this research is to determine the technological parameters for optimal sludge superheated steam drying. Besides building the experimental device for superheated steam drying under atmospheric pressure and choosing the relative unit energy consumption and the average drying strength as the evaluation indices, this paper has also designed the experiment of three-factor quadratic orthogonal rotation combination. A mathematical model is also built, which adopts the technological parameters for sludge superheated steam drying including superheated steam temperature sludge quality and superheated steam flow. In addition, this paper has employed the single-factor and two-factor method to analyze the relationship between various factors and evaluation indices. According to the analysis on experimental data, the established regression equation of establishing is significant, and the coefficient of determination on the relative unit energy consumption and the average drying strength were 0.842 and 0.797, respectively. The 3 factors listed in the descending order of their importance to the 2 evaluation ind ices are sludge mass, steam flow and steam temperature. For the sludge superheated steam drying in terms of relative unit energy consumption, the optimal technological parameters are presented as follows, steam temperature being 215℃, superheated steam flow being 30 m3/h, sludge mass being 26 g (8 mm thickness approximately) and steam flow being 30 m3/h. Under these conditions, the predicted relative unit energy consumption is 281.313 kJ/g. The actual relative unit energy consumption gained from the validity experiment is 280 kJ/g, with the relative error being 0.467%. Hence, the experimental result can provide reference for parameter optimization of sludge superheated steam drying and the design of drying equipment.