Study on oil-water separation performance of vertical flotation unit enhancing by shallow sedimentation technology

doi:10.19965/j.cnki.iwt.2022-1241

Abstract

Key words: flotation, shallow settlement, oil-water separation efficiency, oil droplet size, population balance model

关键词: 气浮, 浅层沉降, 油水分离效率, 油滴粒径, 群体平衡模型

CLC Number:

Yiyong PAN, Jian ZHANG. Study on oil-water separation performance of vertical flotation unit enhancing by shallow sedimentation technology[J]. Industrial Water Treatment, 2023, 43(7): 185-193.

潘亿勇, 张健. 浅层沉降技术强化立式气浮油水分离性能研究[J]. 工业水处理, 2023, 43(7): 185-193.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-1241

https://www.iwt.cn/EN/Y2023/V43/I7/185

Figures/Tables 12

Fig. 1 Process flow diagram of vertical flotation system enhanced by shallow sedimentation technology

Table 1 Main design parameters of small vertical floatation enhanced by shallow sedimentation prototype

设计参数	数值	设计参数	数值
额定处理量/（m³·h^-1）	1	设备有效体积/m³	0.05
水力停留时间/s	180	罐体内径/mm	270
罐体高径比	3.4	罐内有效高度/mm	830
水力负荷/（m³·m^-2·h^-1）	9	空心锥台组高度/mm	420

Table 2 Summary of board length calculation formulas

计算方法		表达式	尾项变化范围
计算方法		表达式	斜角45^o	斜角60^o
田中		$L = V D V 0 c o s α - D s i n α ⋅ c o s α$	-2D	-2.31D
姚式		$L = V D V 0 c o s α - D s i n α c o s α$	-D	-1.73D
理想分离	下向矩形	$L = V D V 0 c o s α - D s i n α c o s α$	-D	-1.73D
	下向四边	$L = V D V 0 c o s α - D s i n α ⋅ c o s α$	-2D	-2.31D
	上向矩形	$L = V D V 0 c o s α + D s i n α c o s α$	+D	+1.73D
	上向四边	$L = V D V 0 c o s α + D s i n α ⋅ c o s α$	+2D	+2.31D
	侧向	$L = V D V 0 c o s α$	0	0

Table 2 Summary of board length calculation formulas

计算方法		表达式	尾项变化范围
计算方法		表达式	斜角45^o	斜角60^o
田中		$L = V D V 0 c o s α - D s i n α ⋅ c o s α$	-2D	-2.31D
姚式		$L = V D V 0 c o s α - D s i n α c o s α$	-D	-1.73D
理想分离	下向矩形	$L = V D V 0 c o s α - D s i n α c o s α$	-D	-1.73D
	下向四边	$L = V D V 0 c o s α - D s i n α ⋅ c o s α$	-2D	-2.31D
	上向矩形	$L = V D V 0 c o s α + D s i n α c o s α$	+D	+1.73D
	上向四边	$L = V D V 0 c o s α + D s i n α ⋅ c o s α$	+2D	+2.31D
	侧向	$L = V D V 0 c o s α$	0	0

Table 3 Main structural parameters of hollow cone abutment group

设计参数	数值	设计参数	数值
空心锥台的倾角/（°）	60	空心锥台的个数或层数	6
空心锥台的外径/mm	240	空心锥台组总高/mm	420
空心锥台的内径/mm	220	浅层沉降流道高度/mm	40

Table 4 The model parameters employed in the PBM

因素	生长因子（Kv）	液滴粒径分段数量	液滴体积等比系数	液滴粒径最小值/μm	液滴粒径最大值/μm
设置值	0.523 598 8	8	3	1	128

Fig.2 Network topology diagram of the model of vertical floatation enhanced by shallow sedimentation

Fig. 3 Results of grid independence verification

Fig.4 Distribution characteristics of velocity field in hollow cone abutment structure

Fig.5 Distribution characteristics of oil phase in hollow cone abutment structure

Fig. 6 Effect of the layer height of the shallow sedimentation on oil-water separation characteristics

Table 5 Orthogonal experiment result analysis list

实验序号	实验因素与水平				实验结果
实验序号	流量/（m³·h^-1）	注气比/%	管道背压/MPa	分流比/%	入口油质量浓度/（mg·L^-1）	出口油质量浓度/（mg·L^-1）	除油效率/%
1	0.5	4	0.05	1	454	95.21	79.01
2	0.5	6	0.1	3	526	128.32	75.61
3	0.5	8	0.15	5	553	139.5	74.77
4	0.5	10	0.2	8	542	167.59	69.08
5	1	4	0.1	5	352	120.91	65.65
6	1	6	0.05	8	362	74.58	79.4
7	1	8	0.2	1	410.45	163.92	60.06
8	1	10	0.15	3	599.45	147.38	75.41
9	1.5	4	0.15	8	384.18	119.54	68.88
10	1.5	6	0.2	5	402.13	158.63	60.55
11	1.5	8	0.05	3	346	98.52	71.53
12	1.5	10	0.1	1	372.15	116.01	68.83
13	2	4	0.2	3	453.83	158.44	65.09
14	2	6	0.15	1	504.94	152.04	69.89
15	2	8	0.1	8	431.27	146.26	66.09
16	2	10	0.05	5	387.32	135.48	65.02
$K$ ₁	0.686	0.697	0.717	0.694
$K$ ₂	0.701	0.714	0.690	0.719
$K$ ₃	0.674	0.681	0.722	0.665
$K$ ₄	0.665	0.696	0.637	0.709
R	0.081	0.033	0.100	0.054

Table 5 Orthogonal experiment result analysis list

实验序号	实验因素与水平				实验结果
实验序号	流量/（m³·h^-1）	注气比/%	管道背压/MPa	分流比/%	入口油质量浓度/（mg·L^-1）	出口油质量浓度/（mg·L^-1）	除油效率/%
1	0.5	4	0.05	1	454	95.21	79.01
2	0.5	6	0.1	3	526	128.32	75.61
3	0.5	8	0.15	5	553	139.5	74.77
4	0.5	10	0.2	8	542	167.59	69.08
5	1	4	0.1	5	352	120.91	65.65
6	1	6	0.05	8	362	74.58	79.4
7	1	8	0.2	1	410.45	163.92	60.06
8	1	10	0.15	3	599.45	147.38	75.41
9	1.5	4	0.15	8	384.18	119.54	68.88
10	1.5	6	0.2	5	402.13	158.63	60.55
11	1.5	8	0.05	3	346	98.52	71.53
12	1.5	10	0.1	1	372.15	116.01	68.83
13	2	4	0.2	3	453.83	158.44	65.09
14	2	6	0.15	1	504.94	152.04	69.89
15	2	8	0.1	8	431.27	146.26	66.09
16	2	10	0.05	5	387.32	135.48	65.02
$K$ ₁	0.686	0.697	0.717	0.694
$K$ ₂	0.701	0.714	0.690	0.719
$K$ ₃	0.674	0.681	0.722	0.665
$K$ ₄	0.665	0.696	0.637	0.709
R	0.081	0.033	0.100	0.054

Fig. 7 Effect of flowrate on oil-water separation efficiency of vertical flotation device

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