Simultaneous Online Measurement of H_2O and CO_2 in the Humid CO_2 Adsorption/Desorption Process
Simultaneous Online Measurement of H_2O and CO_2 in the Humid CO_2 Adsorption/Desorption Process
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DOI：
10.2116/analsci.31.757
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发表时间：
2015-08
影响因子：
1.6
通讯作者：
Qingni Yu;S. Ye;Jingke Zhu;L. Lei;Binying Yang
中科院分区：
文献类型：
--
作者：
Qingni Yu;S. Ye;Jingke Zhu;L. Lei;Binying Yang
将露点仪（DP）和红外（IR）CO_2分析仪串联在湿CO_2吸附/脱附系统中，分别在线测量H_2O和CO_2。自制的加湿器采用饱和盐水溶液表面冲洗的方式产生湿气流。结果表明，与鼓泡法相比，该方法较容易获得较低的气流中H_2O含量，且气流中H_2O含量波动较小。为了减小H_2O的测量误差，需要对DP-IR探测器进行水定标。实验结果表明，解吸过程中H_2O和CO_2同时在线测量的相对误差（RA）小于0.1%。H_2O吸附的RA较高是由于H_2O在输送管上的吸附和测量误差的放大。同时在线测量H_2O和CO_2的高准确度为研究它们的共吸附/脱附行为，特别是从环境空气中直接捕集CO_2提供了很好的方法。
A dew point meter (DP) and an infrared (IR) CO_2 analyzer were assembled in a humid CO_2 adsorption/desorption system in series for simultaneous online measurements of H_2O and CO_2, respectively. The humidifier, by using surface-flushing on a saturated brine solution was self-made for the generation of humid air flow. It was found that by this method it became relatively easy to obtain a low H_2O content in air flow and that its fluctuation could be reduced compared to the bubbling method. Water calibration for the DP-IR detector is necessary to be conducted for minimizing the measurement error of H_2O. It demonstrated that the relative error (RA) for simultaneous online measurements H_2O and CO_2 in the desorption process is lower than 0.1%. The high RA in the adsorption of H_2O is attributed to H_2O adsorption on the transfer pipe and amplification of the measurement error. The high accuracy of simultaneous online measurements of H_2O and CO_2 is promising for investigating their co-adsorption/desorption behaviors, especially for direct CO_2 capture from ambient air.