Shenhua Zhunneng Group Co.,Ltd.,CHN Energy
School of Chemical Engineering and Technology,China University of Mining & Technology

絮凝装置通过其内部流场影响絮凝过程和效果。根据涡旋絮凝动力学理论设计了旋流-扰流连续絮凝沉降一体化装置并用于煤泥水的絮凝沉降试验。首先通过沉降管絮凝沉降试验确定合适的药剂添加条件:聚合氯化铝质量浓度5mg/L,聚丙烯酰胺质量浓度2mg/L。在该药剂制度下,以底流浓度和溢流浊度为指标,考察了在内外径分别为50和100mm的环形流道内,底边长10mm的等腰三角形扰流板的高度、组数和安装角度对煤泥水絮凝沉降效果的影响。结果表明,扰流板高度和组数对絮凝沉降效果影响显著:试验范围内,5组扰流板条件下,扰流板高度15mm时最好,溢流浊度为142NTU,比无扰流板时下降54NTU;扰流板组数在0~5时,3组效果最好,溢流浊度降至112NTU;在3组15mm扰流板条件下,改变扰流板角度对絮凝沉降效果影响较小,浊度在107~125NTU,其中30°最理想。分析认为扰流板高度通过控制其引导的涡流特征尺度和能量耗散影响颗粒碰撞与破碎,而扰流板组数主要影响混凝区的长度,进而改变颗粒有效混凝时间。

Flocculating device has a significant impact on the flocculation process and effect by its inner flow field. According to the vortexflocculation dynamics theory, an integrated flocculation-sedimentation device with swirling-disturbed flow field was designed and used forthe continual flocculation and sedimentation of slime water. Firstly, the appropriate reagent addition conditions were determined by thesedimentation tube flocculation sedimentation experiment: the mass concentration of polyaluminum chloride is 5 mg/ L, and the mass concentration of polyacrylamide is 2 mg/ L. Then, under this fixed agents addition condition, the underflow concentration and overflow turbidity were used as indicators to investigate the influence of height, number of groups and installation angle of isosceles triangle spoilers on theflocculation and settlement of slime water in an nnnular flow channel between the inner and outer diameter of 50 and 100 mm, respectively. The results show that the height of the spoiler and the number of groups have a significant effect on the flocculation settlement effect:within the experimental range, the height of the spoiler is the best under the condition of 5 groups of spoilerswhen the height of the spoileris 15 mm, and the overflow turbidity is 142 NTU, which is better than 54 NTU that with none spoiler. When the number of spoiler groupsis in the range of 0-5, the case of 3 groups is the best, and the overflow turbidity is reduced to 112 NTU. Under the condition of 3 groupsof 15 mm spoilers, the change of the spoiler has little effect on the flocculation sedimentation effect, and the turbidity is between 107125 NTU, of which 30° is the most one. The analysis suggests that the spoiler height influences particle collision and breakage by controlling the characteristic scale of the vortex guided by it and the energy dissipation, while the number of spoiler groups mainly affects thelength of the coagulation zone, thereby changing the effective coagulation time of the particles.

国家自然科学基金资助项目(51604273)

胡金良,林喆.煤泥水絮凝沉降效果导向的旋流-扰流流场优化[J].洁净煤技术,2023,29(12):145-150.

HU Jinliang,LIN Zhe.Optimization of swirling-disturbed flow field for flocculation and settlement of coal slime water[J].Clean Coal Technology,2023,29(12):145-150.