Potassium Carbonate Slurry-Based CO2 Capture Technology
Potassium Carbonate Slurry-Based CO2 Capture Technology
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DOI：
10.1021/acs.energyfuels.5b01421
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发表时间：
2015-09
期刊：
影响因子：
5.3
通讯作者：
Shiwang Gao;Dongfang Guo;Hongguang Jin;Sheng Li;Jinyi Wang;Shi-Wen Wang
中科院分区：
文献类型：
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作者：
Shiwang Gao;Dongfang Guo;Hongguang Jin;Sheng Li;Jinyi Wang;Shi-Wen Wang
碳酸盐浆法由于可以减少汽提塔中水的参与，被认为是煤基电站大规模CO2捕集的潜在技术之一。本文采用定容法测量了温度为40、70和120 °C、CO2分压为0.4 ~ 240 kPa时碳酸钾水溶液中的CO2载量。用真热流法测定了CO2在K2 CO 3、MEA和MDEA水溶液中的吸收热，并进行了比较。循环CO2平衡负荷随K2 CO 3浓度的增加而增加，有利于CO2的捕集。然而，增加的粘度导致表观吸收速率的降低。吸收热取决于温度、K2 CO 3浓度和CO2负载。与MEA相比，碳酸钾溶液具有较低的吸收热。生成碳酸氢钾结晶可增强CO2吸收，但也增加吸收热。泥浆解吸可以减少...
Carbonate slurry process is considered to be one of the potential technologies for large-scale CO2 capture from coal-based power stations, as it can reduce the participation of water in stripper. In this work, constant volume method was adopted to measure the CO2 loading in aqueous potassium carbonate solutions at the temperatures of 40, 70, and 120 °C for CO2 partial pressure from 0.4 to 240 kPa. Absorption heats of CO2 in aqueous solutions of K2CO3, MEA, and MDEA were measured and compared using true heat flow method. The cyclic CO2 equilibrium loading increases with K2CO3 concentration increase, which is a benefit for CO2 capture. However, the increased viscosity leads to a decrease of the apparent absorption rate. Absorption heat depends on temperature, K2CO3 concentration, and CO2 loading. Compared to MEA, potassium carbonate solution has a lower absorption heat. Generated potassium bicarbonate crystallization can enhance CO2 absorption but also increase absorption heat. Slurry desorption can reduce ...