Modification method of calcium-based ascarite

Abstract

A method to modify calcium based carbon-dioxide absorbent is that the prepared water solution of ethanol / KMnO4 is arranged in a container under the condition of normal temperature and normal pressure. The calcium based absorbent is calcined for one to two hours, and CaO particles generated are gradually added into the water solution of ethanol / KMnO4, and are stirred all along. After the mixture is stirred for one hour, the reaction product is dried, thus getting the high performance calcium based carbon-dioxide absorbent. The method can be applied in the process of removal of carbon dioxide in large scale by circulated calcination / carbonation during combustion or gasification of fossil fuel, and ethanol can be reclaimed and recycled according to the theory that the boiling points of ethanol and water are different. According to research, the modification method improves the caking resistance and the carbonation capacity of the calcium based absorbent during long circulated calcination / carbonation. With simple and convenient operation, the modification method needs low investment and cost, and is prospective in industrial application.

Description

Modification method of calcium-based carbon dioxide absorbent technical field The invention relates to a method for improving the cyclic carbonation performance of a calcium-based carbon dioxide absorbent, and belongs to the technical field of environmental pollution prevention and clean coal combustion. Background technique The World Energy Agency once asserted that the CO2 content in the atmosphere has the most direct impact on the earth's environment suitable for human habitation. The reality of global warming is constantly sounding the alarm to people all over the world. The climate warming in the past 50 years is mainly caused by the warming effect of greenhouse gases such as CO2. Negative effects of global warming include: sea level rise and land inundation, movement of climate zones, intensification of hurricanes, vegetation migration and species extinction, changes in ocean currents and frequent El Niño, changes in rain patterns, and epidemics of plague Wait. A...

AI Technical Summary

Problems solved by technology

However, studies have shown that there is a problem of serious performance attenuation in CO2 absorbents such as limestone, that is, as the number of cyclic calcination / carbonation reactions increases, the carbonation conversion rate of the absorbent decreases rapidly due to sintering. After about 10 cyclic reactions Carbonation conversion rate drops below 30%

In order to maintain a high CO2 removal efficiency, the addition of fresh absorbent has to be increased, which not only increases the cost, but also the wear of the reactor caused by a large amount of absorbent threatens the safety and economic operation of the equipment

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