本文選題：液相返混　切入點(diǎn)：氯堿電解槽　出處：《沈陽(yáng)化工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在離子膜電解槽運(yùn)行過(guò)程中,液相返混程度直接關(guān)系到槽內(nèi)電解液的濃度分布、溫度分布以及反應(yīng)速率和反應(yīng)產(chǎn)物分布,從而影響電解過(guò)程的經(jīng)濟(jì)性和電解槽的使用壽命。鑒于離子膜對(duì)電解液有低濃度差、低溫度差等要求,適當(dāng)?shù)脑龃笠合喾祷鞂?duì)電解過(guò)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(píng)價(jià)指標(biāo)。本文采用冷模實(shí)驗(yàn)和數(shù)值模擬兩種方法對(duì)離子膜電解槽陽(yáng)極內(nèi)液相返混的影響進(jìn)行了研究。利用多釜串聯(lián)模型,定量考察了氣體流量和液體流量對(duì)液相返混程度的影響。對(duì)本文所研究的六種不同結(jié)構(gòu)的電解槽內(nèi)的液相返混進(jìn)行了比較。研究結(jié)果表明,當(dāng)電流密度為5 kA·m~(-2)時(shí),電解槽的多釜串聯(lián)模型參數(shù)為2.782。僅增大液體流量,模型參數(shù)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(xiàn)先變?cè)龃蠛鬁p小的趨勢(shì),說(shuō)明液體流量一定時(shí),電解槽存在最佳操作氣速(或最佳操作電流密度);當(dāng)電流密度增大時(shí)(氣液相流量同時(shí)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(nèi)的液相返混程度由大到小依次為:前后開(kāi)口鼓泡板、前開(kāi)口加圓管、前后開(kāi)口、原始槽型、后開(kāi)口和后開(kāi)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(jié)構(gòu)優(yōu)劣的評(píng)價(jià)指標(biāo)。返混程度越大,槽內(nèi)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(xué)位授予單位】：沈陽(yáng)化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TQ114.262

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