Chaotic analysis of pressure fluctuation and identification of flow regime in chlor-alkali electrolyzer

doi:10.11949/j.issn.0438-1157.20180914

Abstract

Abstract:

In order to clarify the pressure fluctuation characteristics and flow patterns of the gas- liquid two-phase flow in the chlor-alkali electrolyzer, the pressure signals at the upper opening of the recirculation plate in the anode chamber of a cold-model electrolyzer were analyzed by using chaos method. The flow patterns were identified by the Kolmogorov entropy descending method and the pictures taken by a high-speed camera. The flow pattern maps were drawn. The flow patterns under different current densities were determined. The results show that, the attractors of pressure signal of electrolyzer have fractional dimension. The values of Lyapunov exponent are greater than 0 when the current density exceeds 6 kA·m^-2. These results demonstrate the gas-liquid two-phase flow in the electrolyzer has chaotic characteristics. For the position of the upper opening of the circulation plate and the lower section of the electrolyzer, the fully developed section of the jet flow and the isolated bubble flow appear when the current density is less than 5 kA·m^-2. The transition section of the jet flow and combined bubble flow appear when the current density is 5－8 kA·m^-2. The initial section of the jet flow and combined bubble flow appear when the current density is greater than 8 kA·m^-2.

Key words: chlor-alkali industry, electrolysis, chemical reactors, gas-liquid two-phase flow, pressure signal, chaos, flow pattern

摘要：

为研究氯碱电解槽内气液两相流动的压力波动特性和流型特点，对冷模电解槽阳极室内循环板上开口处的压力信号进行了混沌特性分析；利用高速摄像仪照相法及Kolmogorov熵下降法对流动形态进行了识别，绘制了流型图；利用流型图对不同电流密度下的两相流型进行了判定。结果表明，电解槽压力信号的吸引子具有分数维数，当电流密度大于6 kA·m^-2时，Lyapunov指数大于0，说明电解槽内两相流动具有混沌特性；对于测压点位置及电解槽下部，当电流密度小于5 kA·m^-2时，分别为射流充分发展段和孤立气泡流；电流密度为5 ~ 8 kA·m^-2时为射流过渡段和合并气泡流；电流密度大于8 kA·m^-2时为射流的初始段和合并气泡流。

关键词: 氯碱工业, 电解, 化学反应器, 气液两相流, 压力信号, 混沌, 流型

CLC Number:

TQ 021.1

Li ZHANG, Gang YOU, Xiaofeng QIAO, Guangwen XU, Guozhen LIU, Yunyi LIU. Chaotic analysis of pressure fluctuation and identification of flow regime in chlor-alkali electrolyzer[J]. CIESC Journal, 2019, 70(S1): 35-44.

张丽, 由钢, 乔霄峰, 许光文, 刘国桢, 刘云义. 氯碱电解槽内压力波动的混沌分析及流型识别[J]. 化工学报, 2019, 70(S1): 35-44.

Figures/Tables 13

Fig.1 Flow sheet of experimental setup for pressure fluctuation measurement in cold-model anode chamber of chlor-alkali electrolyzer

Fig.2 Pattern of gas inlet

Fig.3 Side view of anode chamber

Fig.4 Pressure signal time series

Fig.5 Photos of bubbles at different gas and liquid flow rates

Fig.6 Power spectra at different gas and liquid flow rates

Fig.7 Reconstructed phase space of pressure signals under different gas and liquid flow rates

Fig.8 Calculation of correlation dimension of pressure signals time series

Fig.9 Correlation dimension of time series of pressure signals and flow patterns

Fig.10 Maximum Lyapunov exponents of time series of pressure signals and flow patterns

Fig.11 Kolmogorov entropy at different gas and liquid flow rates

Fig.12 Identification results of gas-liquid two-phase flow patterns in electrolytic cell

Table 1 Flow patterns in cell at different current density

I/(kA·m^-2)	Q_g /(L·min^-1)	Q_l /(ml·s^-1)	D	λ	K	ε/%	流动状态
I/(kA·m^-2)	Q_g /(L·min^-1)	Q_l /(ml·s^-1)	D	λ	K	ε/%	B点	C点
3.0	2.47	1.41	5.135	-0.0248	0.3166	3.05	充分发展段	孤立气泡流
4.0	3.29	1.88	4.735	-0.0432	0.4849	4.00	充分发展段	孤立气泡流
5.0	4.12	2.36	4.507	-0.0151	0.4676	4.70	过渡段	合并气泡流
6.0	4.95	2.83	4.288	0.0096	0.5703	5.75	过渡段	合并气泡流
7.0	5.77	3.31	4.169	0.0345	0.6373	6.83	过渡段	合并气泡流
8.0	6.60	3.78	4.169	0.0134	0.6183	7.98	过渡段	合并气泡流

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