Device and process for cyclic capture of carbon dioxide by taking CaO as carrier

Abstract

The invention discloses a process for cyclic capture of carbon dioxide in smoke gas by taking CaO as a carrier. The process comprises the following steps of: step A) performing purification treatment on tail gas; step B) carbonizing; step C) performing CaCO3 treatment on a carbonized product; step D) performing CO2 desorption; step E) performing CaO digestion; step F) performing lime milk refining; step G) recycling lime milk; and step H) storing (sealing) high-purity CO2. Correspondingly, the invention further discloses a device for cyclic capture of the carbon dioxide in the smoke gas by taking the CaO as the carrier, and the device comprises a purifying device, a carbonizing tower, a settling separation machine, a centrifuge, a drying machine, a metering device, an annular calcining furnace, a material storage bin, a bucket type elevator, a slaking machine, a coarse pulp pool and a hydrocyclone separator, which are connected through a pipeline and a material conveying system. The process has the advantages of mature conditions, simple steps and high capture efficiency of the CO2, and the device for implementing the process has the advantages of compact structure, low investment operation strength and good industrial application prospects.

Description

technical field [0001] The invention relates to the field of carbon dioxide emission reduction, in particular to a device and process for circularly capturing carbon dioxide with CaO as a carrier. Background technique [0002] carbon dioxide (CO 2 ) is one of the main components of greenhouse gases that cause global warming, and contributes as much as 55% to the greenhouse effect. Due to CO 2 Climate change caused by greenhouse gas emissions has become the focus of attention around the world. Carbon capture and storage technology (CCS technology) refers to a technology that captures and separates carbon dioxide from related concentrated emission combustion sources, and uses various methods to store it to avoid its emission into the atmosphere. It is the most effective way to deal with climate change. One of the technical paths. [0003] Coal-fired power generation, iron and steel, metallurgy, cement and other industries need to consume a lot of fossil fuels in the product...

AI Technical Summary

Problems solved by technology

But the method Ca(OH) 2 SO removal by solution 2 During the process, CO in the flue gas will be absorbed at the same time 2 , so that the absorption reactor CO 2 Import concentration is low, increasing the difficulty of capture

In addition, this patent still uses the method of dual fluidized beds combined with biomass fuel pure oxygen combustion to realize the cyclic regeneration of the adsorbent, which greatly reduces the amount of waste gas in the production process, but the technology of pure oxygen combustion is relatively difficult, and the investment and operation costs In addition, this method cannot solve the problem of external air entering the reactor due to the poor sealing of the inlet and outlet of the fluidized bed reactor, causing CO 2 The problem of reduced purity

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