本文選題：液相返混　切入點：氯堿電解槽　出處：《沈陽化工大學》2017年碩士論文　論文類型：學位論文

【摘要】：在離子膜電解槽運行過程中,液相返混程度直接關系到槽內電解液的濃度分布、溫度分布以及反應速率和反應產物分布,從而影響電解過程的經濟性和電解槽的使用壽命。鑒于離子膜對電解液有低濃度差、低溫度差等要求,適當的增大液相返混對電解過程是有利的。因此,本文提出以液相返混程度作為電解槽性能優(yōu)劣的評價指標。本文采用冷模實驗和數值模擬兩種方法對離子膜電解槽陽極內液相返混的影響進行了研究。利用多釜串聯模型,定量考察了氣體流量和液體流量對液相返混程度的影響。對本文所研究的六種不同結構的電解槽內的液相返混進行了比較。研究結果表明,當電流密度為5 kA·m~(-2)時,電解槽的多釜串聯模型參數為2.782。僅增大液體流量,模型參數隨之增大,返混程度變小;僅增大氣體流量,液相返混程度呈現先變增大后減小的趨勢,說明液體流量一定時,電解槽存在最佳操作氣速(或最佳操作電流密度);當電流密度增大時(氣液相流量同時增大),液相返混程度逐漸減小。液體流量是影響液相返混的主要因素。本文所研究的六種電解槽內的液相返混程度由大到小依次為:前后開口鼓泡板、前開口加圓管、前后開口、原始槽型、后開口和后開口槽板傾斜。本文研究表明,液相返混程度可以作為電解槽結構優(yōu)劣的評價指標。返混程度越大,槽內溫度和濃度分布越均勻。
[Abstract]:During the operation of ionic membrane electrolyzer, the liquid phase backmixing degree is directly related to the electrolyte concentration distribution, temperature distribution, reaction rate and reaction product distribution. Therefore, the economy of electrolysis process and the service life of electrolytic cell are affected. In view of the low concentration difference and low temperature difference of ionic membrane, it is advantageous to increase the liquid phase backmixing properly. In this paper, the degree of liquid phase backmixing is proposed as the evaluation index for the performance of electrolytic cells. The effects of cold model experiment and numerical simulation on the liquid phase backmixing in the anode of ionic membrane electrolyzer are studied in this paper, and the multivessel series model is used. The effects of gas flow rate and liquid flow rate on the degree of liquid phase backmixing are quantitatively investigated. The liquid phase backmixing in six kinds of electrolytic cells with different structures studied in this paper is compared. The results show that when the current density is 5 Ka 路m ~ (-1), The model parameters of the multi-vessel series model of the electrolyzer are 2.782.The model parameters increase with increasing the flow rate of liquid, and the degree of backmixing becomes smaller, and the degree of backmixing increases first and then decreases when the flow rate of gas is increased, which shows that when the flow rate of liquid is fixed, The optimum operating gas velocity (or optimal operating current density) exists in the electrolytic cell; when the current density increases (the gas-liquid flow rate increases at the same time, the liquid phase backmixing degree decreases gradually. The liquid flow rate is the main factor affecting the liquid phase backmixing. The degree of liquid phase backmixing in the six kinds of electrolytic cells studied in this paper is as follows: front and rear opening bubbling plate, In this paper, it is shown that the liquid phase backmixing degree can be used as the evaluation index of the structure of the electrolytic cell, and the greater the backmixing degree, the greater the backmixing degree. The distribution of temperature and concentration in the tank is more uniform.
【學位授予單位】：沈陽化工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ114.262

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