CO2 capture by carbide slag calcined under high-concentration steam and energy requirement in calcium looping conditions
CO2 capture by carbide slag calcined under high-concentration steam and energy requirement in calcium looping conditions
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高浓度蒸汽煅烧电石渣捕集CO2及钙循环条件下的能量需求
DOI：
10.1016/j.apenergy.2017.08.236
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发表时间：
2017-11
期刊：
影响因子：
11.2
通讯作者：
Song Haiping
中科院分区：
文献类型：
--
作者：
Zhang Wan;Li Yingjie;He Zirui;Ma Xiaotong;Song Haiping
本研究提出了以O2/H2O燃烧方式实现的高浓度水蒸气煅烧取代钙链中通常采用O2/CO2燃烧方式实现的高浓度CO2煅烧。采用双固定床反应器，在高浓度水蒸气煅烧条件下，研究了电石渣在钙循环过程中的CO2捕集性能。在高浓度水蒸气（95%）气氛下煅烧，电石渣可在800 ℃下完全快速分解，比高浓度CO2（100%）气氛下煅烧温度低150 ℃。在高浓度水蒸气条件下煅烧1次和10次后，电石渣的碳酸化转化率分别比在高浓度CO2条件下煅烧的高42%和36%。这是因为电石渣在高浓度水蒸气下煅烧时，生成了相对较小的CaO颗粒和较多的多孔结构，有利于电石渣捕集CO2。由于电石渣煅烧温度低，捕集CO2能力强，在高浓度水蒸汽条件下，煅烧炉捕集每摩尔CO2所需的能量比在高浓度CO2条件下低。当电石渣回用流量与CO2流量之比为2，吸收剂补充比为0.09时，高浓度水蒸气煅烧取代高浓度CO2煅烧可使钙链系统中CO2捕集效率从0.68提高到0.88，且每摩尔CO2的煅烧炉捕集能耗降低1/4。因此，将O2/H2O燃烧作为电石渣钙循环的O2/CO2燃烧的替代供能方式是合理的。
In this work, calcination under high-concentration steam that can be implemented by O2/H2O combustion was proposed to replace high-concentration CO2that usually was implemented by O2/CO2combustion in calcium looping. CO2capture performance of the carbide slag, an industrial solid waste from chlor-alkali plants, was investigated in a dual fixed-bed reactor under high-concentration steam calcination condition during the calcium looping cycles. Calcined under high-concentration steam (95%) atmosphere, the carbide slag can be completely and quickly decomposed at 800 °C, which is 150 °C lower than the calcination temperature under high-concentration CO2(100%) atmosphere. The carbonation conversions of the carbide slag calcined under high-concentration steam condition after 1 and 10 cycles are about 42% and 36% higher than those calcined under high-concentration CO2condition, respectively. This is because when the carbide slag is calcined under high-concentration steam, the relatively smaller CaO grains and more porous structure are generated, which are beneficial for CO2capture by carbide slag. Due to the low calcination temperature and the high CO2capture capacity of the carbide slag, the energy requirement in the calciner to capture per mole CO2under high-concentration steam condition is lower than that under high-concentration CO2condition. High-concentration steam calcination in place of high-concentration CO2calcination improves the CO2capture efficiency from 0.68 to 0.88 and saves a quarter of the energy consumption in the calciner for capturing per mole CO2in the calcium looping system, when the ratio of recycled carbide slag flow rate to CO2flow rate is 2 and the sorbent make-up ratio is 0.09. Thus, it is reasonable to consider O2/H2O combustion as an alternative energy-supply way of O2/CO2combustion for the calcium looping of carbide slag.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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作者：
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DOI：
10.1080/15567036.2013.820234
发表时间：
2016-02
期刊：
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects
影响因子：
--
作者：
Dengfeng Zhang;Songgeng Li;Wen-li Song;Weigang Lin
通讯作者：
Dengfeng Zhang;Songgeng Li;Wen-li Song;Weigang Lin
影响因子：
11.2
作者：
P. E. Sánchez-Jiménez;L. Pérez-Maqueda;J. Valverde
通讯作者：
P. E. Sánchez-Jiménez;L. Pérez-Maqueda;J. Valverde