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首页> 外文期刊>Environmental Science & Technology >Analysis of SO_2 Sorption Capacity of Rice Husk Ash (RHA)/CaO/NaOH Sorbents Using Response Surface Methodology (RSM): Untreated and Pretreated RHA
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Analysis of SO_2 Sorption Capacity of Rice Husk Ash (RHA)/CaO/NaOH Sorbents Using Response Surface Methodology (RSM): Untreated and Pretreated RHA

机译：稻草灰（RHA）/ CaO / NaOH吸附剂对SO_2的吸附能力的响应面分析（RSM）：未处理和预处理的RHA

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摘要

The SO_2 sorption capacity (SSC) of sorbents prepared from rice husk ash (RHA) with NaOH as additive was studied in a fixed-bed reactor. The sorbents were prepared using a water hydration method by slurrying RHA, CaO, and NaOH. Response surface methodology (RSM) based on four-variable central composite face centered design (CCFCD) was employed in the synthesis of the sorbents. The correlation between the sorbent SSC (as response) with four independent sorbent preparation variables, i.e. hydration period, RHA/CaO ratio, NaOH amount, and drying temperature, were presented as empirical mathematical models. Among all the variables studied, the amount of NaOH used was found to be the most significant variable affecting the SSC of the sorbents prepared. The SSC for sorbent prepared with the addition of NaOH was found to be significantly higher than sorbents prepared without NaOH. This is probably because NaOH is a deliquescent material, and its existence increases the amount of water collected on the surface of the sorbent, a condition required for sorbent-SO_2 reaction to occur at low temperature. The effect of furthertreatment of RHA at 600℃ was also investigated. Although pretreated RHA sorbents demonstrated higher SSC as compared to untreated RHA sorbents, nevertheless, at optimum conditions, sorbents prepared from untreated RHA was found to be more favorable due to practical and economic concerns.
机译：在固定床反应器中研究了用稻壳灰（RHA）和NaOH作为添加剂制备的吸附剂对SO_2的吸附能力（SSC）。使用水合方法通过将RHA，CaO和NaOH制成浆液来制备吸附剂。在吸附剂的合成中采用了基于四变量中心复合材料面心设计（CCFCD）的响应表面方法（RSM）。作为经验数学模型，给出了吸附剂SSC（作为响应）与四个独立的吸附剂制备变量之间的相关性，即水合时间，RHA / CaO比，NaOH量和干燥温度。在所有研究的变量中，发现使用的NaOH量是影响所制备吸附剂SSC的最重要变量。发现通过添加NaOH制备的吸附剂的SSC明显高于没有NaOH制备的吸附剂。这可能是因为NaOH是潮解性物质，并且它的存在会增加在吸附剂表面上收集的水量，这是低温下发生吸附剂-SO_2反应所需的条件。还研究了在600℃下进一步处理RHA的效果。尽管与未处理的RHA吸附剂相比，预处理的RHA吸附剂显示出更高的SSC，但在最佳条件下，由于实际和经济方面的考虑，发现由未处理的RHA吸附剂制备的吸附剂更为有利。

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