A Method for Capturing Carbon Dioxide in Flue Gas Using Renewable Carbide Slag

Abstract

The invention relates to the application field of carbide slag, and in particular relates to a method for trapping carbon dioxide from smoke by renewable carbide slag. According to the invention, the method for trapping carbon dioxide from smoke by renewable carbide slag comprises the following steps: 1) calcining the carbide slag to obtain an absorbent with an effective constituent of calcium oxide; 2) adding the absorbent of step 1) to a carbonization reactor to absorb carbon dioxide from the smoke to obtain calcium carbonate and clean smoke; 3) calcining the calcium carbonate of step 2) to regenerate the absorbent; 4) eliminating the inactive constituents from the regenerated absorbent of step 3), adding new carbide slag, returning to step 2) for recycling, and repeating steps 2) to 4). The invention has the advantage of following the environment protection concept of treating wastes by wastes, so as to lower the discharge of carbon dioxide from the smoke, and has favorable application prospects.

Description

technical field [0001] The invention relates to the application field of carbide slag, in particular to a method for capturing carbon dioxide in flue gas by using renewable carbide slag. Background technique [0002] The trend of global warming caused by greenhouse gases has become an environmental issue that the international community is generally concerned about. 2 It is the most important type of greenhouse gas, and its greenhouse effect accounts for about 77% of all greenhouse gases, thus controlling CO 2 Emissions are essential for controlling the greenhouse effect and slowing down the trend of climate change. China is the most populous country in the world, and its energy consumption structure is dominated by coal. Therefore, the country is used as the statistical unit to calculate the total amount. At present, China is the world's largest emitter of greenhouse gases. As a developing country, with the acceleration of the modernization process, China's greenhouse gas...

AI Technical Summary

Problems solved by technology

At present, method (1) is mainly adopted for the treatment and disposal of calcium carbide slag. This treatment method will occupy a large amount of land, pollute shallow groundwater and cause soil salinization. Therefore, this method cannot effectively utilize calcium carbide slag, an industrial waste. and governance

The resource utilization of carbide slag mainly includes: (1) Chinese invention patent No. ZL200810116928.0 introduces the wet flue gas desulfurization process using carbide slag as absorbent, (2) Chinese invention patent No. 200810146495.3 introduces A kind of utilization calcium carbide slag to prepare high-purity CaCO 3 However, the effective utilization rate of calcium carbide slag is still very low, and most of them are still buried and piled up, which brings pollution to the environment

[0006] Therefore, with the increasing trend of global warming caused by the greenhouse gases emitted by human beings, the international community has paid more attention to the issue of greenhouse gas emission reduction in recent years, and extensive research on carbon dioxide capture technology has been carried out. 2 In the method, the environmental benefit is low, the attenuation coefficient of the absorbent is large, and the calcium carbide slag as industrial waste pollutes the environment and cannot be effectively used. The present invention uses calcium carbide slag as the calcium-based Absorbent circulation captures CO in flue gas 2

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