Analysis of carbide slag accelerated carbonation in bubble column and response surface optimization

被引：0

作者：

Zheng P. ^{[1
]}

Li W. ^{[1
]}

Guo Y. ^{[1
]}

Sun J. ^{[1
]}

Wang R. ^{[1
]}

Zhao C. ^{[1
]}

机构：

[1] School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 03期

关键词：

Accelerated carbonation; Bubble column reactor; Carbide slag; CO[!sub]2[!/sub] capture; Greenhouse gas; Multiphase reactor; Response surface model;

D O I：

10.16085/j.issn.1000-6613.2021-1712

中图分类号：

学科分类号：

摘要：

A bubble column carbonation reactor was set up. The CO2 mineralization capacity through the direct aqueous carbonation of carbide slag under ambient temperature and atmospheric pressure was evaluated. The effects of the important operating parameters, including the superficial gas velocity, liquid to solid ratio and CO2 concentration, on the capacity of CO2 mineral carbonation and carbonation efficiency of carbide slag were revealed. The response surface model was built to analyze the effects of the operating parameters and to obtain the maximum of the carbonation efficiency. The results indicated that the increase in the gas velocity was beneficial to the calcium ion dissolution and CO2 absorption, but it will have the gas channeling effect in the reactor when the gas velocity was high, which has an effect on the solid-liquid mass transfer and reduces the carbonation efficiency. When the liquid to solid ratio reduced, the concentration of calcium ions rose, which was good for the carbonation reactions. However, when the liquid to solid ratio was very small, it was disadvantageous for the solid-liquid mass transfer. Proper increase in the CO2 concentration was beneficial to enhance the carbonation efficiency. When the CO2 concentration increased to a certain level, it had a rare effect on the carbonation efficiency. According to the response surface modeling, the impact degree on the carbonation efficiency ranged as liquid-solid ratio > CO2 concentration > superficial gas velocity. The optimization carbonation efficiency was 93.58% found by the response surface optimization, and the corresponding superficial gas velocity was 0.07m/s, the liquid-solid ratio 8.26mL/g and the CO2 concentration was 20.91%. Therefore, the results showed that it had a good CO2 mineralization capacity and a high carbonation efficiency for the direct aqueous carbonation of carbide slag under ambient temperature and pressure in a bubble column. This study provides the theoretical data for CO2 capture by aqueous mineral carbonation of carbide slag. Accelerated carbonation of carbide slag in the bubble column is a promising process for CO2 capture due to its higher carbonation conversion of carbide slag within a shorter reaction time. © 2022, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：1528 / 1538

页数：10

共 43 条

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