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  • 張培昆, 張震威, 王立. 用于CO2捕集的新型石灰煅燒過程的數值分析[J]. 工程科學學報, 2022, 44(11): 1978-1987. DOI: 10.13374/j.issn2095-9389.2021.03.22.002
    引用本文: 張培昆, 張震威, 王立. 用于CO2捕集的新型石灰煅燒過程的數值分析[J]. 工程科學學報, 2022, 44(11): 1978-1987. DOI: 10.13374/j.issn2095-9389.2021.03.22.002
    ZHANG Pei-kun, ZHANG Zhen-wei, WANG Li. Numerical analysis of the novel lime calcination process for carbon dioxide capture[J]. Chinese Journal of Engineering, 2022, 44(11): 1978-1987. DOI: 10.13374/j.issn2095-9389.2021.03.22.002
    Citation: ZHANG Pei-kun, ZHANG Zhen-wei, WANG Li. Numerical analysis of the novel lime calcination process for carbon dioxide capture[J]. Chinese Journal of Engineering, 2022, 44(11): 1978-1987. DOI: 10.13374/j.issn2095-9389.2021.03.22.002

    用于CO2捕集的新型石灰煅燒過程的數值分析

    Numerical analysis of the novel lime calcination process for carbon dioxide capture

    • 摘要: 常規石灰煅燒工藝中燃料在煅燒窯內燃燒,石灰石分解所釋放的二氧化碳(CO2)與煙氣混合,CO2捕集需進行氣體分離。而采用CO2作為循環載氣加熱石灰石料塊的新型煅燒過程,可避免上述混合問題,從而實現直接捕集石灰石分解產生的CO2。基于CO2加熱的新型煅燒過程與常規工藝煅燒過程有較大不同,為深入理解新型煅燒過程并對其進行準確設計和有效優化,建立了基于CO2加熱的石灰煅燒過程的數學模型。基于模型對一臺產量為200 t·d?1的煅燒窯進行了模擬計算,獲得了氣固溫差、氣相流量、氣相溫度、料塊表面溫度、反應界面溫度和轉化率等關鍵參數在煅燒窯中的分布情況,并分析了進氣溫度、進氣流量和料塊半徑三個工況參數對煅燒過程的影響。

       

      Abstract: Lime is an important industrial raw material widely used in iron- and steel-making, flue gas desulfurization, construction, and papermaking industries. Lime is generally obtained via calcining limestone in a kiln, i.e., limestone is heated and decomposed to generate lime and carbon dioxide (CO2). In the conventional lime calcination, the CO2 released by the limestone decomposition is mixed with the flue gas because the fuel is burned in the shaft kiln, requiring gas separation for CO2 capture. The new lime calcination process using CO2 as a circulating carrier gas to heat limestone particles can avoid the above mixing problem, thereby directly capturing the CO2 generated by limestone decomposition, which is expected to reduce carbon emissions from lime production by approximately 70%. However, the new calcination process based on CO2 heating is quite different from the conventional calcination process. To understand the new calcination process and accurately design and optimize it, a mathematical model of the lime calcination process based on CO2 heating was established. Based on the model, a shaft kiln with a capacity of 200 t·d?1 was simulated and calculated. In addition, profiles of key parameters such as the gas-solid temperature difference, gas flow rate, gas temperature, particle surface temperature, reacting interface temperature, and conversion ratio in the shaft kiln were obtained. Besides, the three operating parameters (feed gas temperature, feed gas flow rate, and radius of the feeding limestone particle) on the calcination were analyzed. The following observations were made: (1) the lower the feed gas temperature, the lower are the final conversion ratio, pinch temperature difference, and tail gas temperature of the kiln. In addition, the changing trend of the final conversion ratio and pinch temperature difference conforms to a quadratic polynomial law, and the changing trend of the tail gas temperature conforms to a linear law. (2) The lower the feed gas flow rate, the lower are the final conversion ratio, pinch temperature difference, and tail gas temperature of the kiln. Moreover, the changing trend of each parameter conforms to a quadratic polynomial law. (3) Finally, the larger the radius of the feeding limestone particle, the lower is the final conversion ratio of the kiln, the higher is the tail gas temperature, and the greater is the pinch temperature difference. The changing trends of various parameters conform to cubic polynomial laws. Compared with the feed gas temperature and the feed gas flow rate, the radius of the feeding limestone particle has a greater impact on the pinch temperature difference and the tail gas temperature when the final conversion ratio changes in the same range.

       

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