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Efficient Recovery of Carbon Dioxide by Cyclic Fixed-Bed Operations over K_2CO_3/C and the Application to Flue Gases of Coal-Fired Power Plants

K_2CO_3/C循环固定床高效回收二氧化碳及其在燃煤电厂烟气中的应用

基本信息

批准号：
08558066
负责人：
HAYASHI Hiromu
金额：
$ 7.74万
依托单位：
University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08558066/
关键词：
Potassium carbonate carbon Moist carbon dioxide Flue gases Cyclic fixed-bed operations Bench-scale plant

项目摘要

An efficient chemical absorption method capable of cyclic fixed-bed operations under moist conditions for the recovery of carbon dioxide from gases has been proposed employing K_2CO_3-on-carbon. Carbon dioxide was chemically absorbed by the reaction K_2CO_3 + CO_2 + H_2O <double arrow> 2KHCO_3 to form potassium hydrogencarbonate. Moisture, usually contained as high as 8-17% in flue gases, badly affects the capacity of conventional adsorbents such as zeolites, but the presente technology has no concern with moisture ; water is rather necessary in principle as shown in thequation above. Deliquescent potassium carbonate should be supported on an appropriate porous material to adapt for fixed-bed operations. After breakthrough of carbon dioxide, the entrapped carbon dioxide was released by the decomposition of hydrogencarbonte to shift the reaction in reverse on flushing with steam, which could be condensed by cooling to afford carbon dioxide in high purity. Among various preparations of alkaline-earth carbonates (X_2CO_3, X=Li, Na, K) on porous materials, K_2CO_3-on-activated carbon revealed excellent properties for the present purpose. Preparation and characterization of K_2CO_3-on-carbon, and illustrative fixed-bed operations under flue gas conditions in laboratory columns and a bench-scale plant are described.

提出了一种有效的化学吸收方法，能够在潮湿条件下循环固定床操作，利用碳载K_2CO_3从气体中回收二氧化碳。二氧化碳通过反应K_2CO_3 + CO_2 + H_2O <双箭头> 2KHCO_3 被化学吸收，形成碳酸氢钾。烟气中的水分含量通常高达8-17%，严重影响沸石等传统吸附剂的吸附能力，但本技术与水分无关；原则上，水是相当必要的，如上式所示。潮解性碳酸钾应负载在适当的多孔材料上以适应固定床操作。二氧化碳突破后，被截留的二氧化碳通过碳酸氢盐分解释放出来，在蒸汽冲洗下使反应发生逆转，冷却冷凝，得到高纯度的二氧化碳。在多孔材料上碱土碳酸盐（X_2CO_3，X=Li，Na，K）的各种制备中，活性炭上的K_2CO_3显示出适合本目的的优异性能。描述了碳载 K_2CO_3 的制备和表征，以及实验室塔和实验室规模工厂中烟气条件下的说明性固定床操作。