Fluidized bed technology and fluidized bed system for directly capturing CO2 in mineralized flue gas

Abstract

The invention discloses a fluidized bed technology for directly capturing CO2 in mineralized flue gas. In the technology, a high-calcium waste, such as fly ash, carbide slag, steel slag, waste cement and the like, as a raw material. A by-pass is formed on a flue gas discharge pipeline to feed a flue gas flow of which the humidity and the temperature are regulated by a temperature and humidity regulator. In a fluidized bed reactor, the flue gas flow, of which the humidity and the temperature are regulated, is contacted with the high-calcium waste in a co-current flow manner to generate calcium carbonate. After the reaction, a dust-containing gas flow discharged out from the fluidized bed reactor is fed into a cyclone separator for gas-solid separation to obtain a gas flow, wherein the gas flow is fed into the original flue gas discharge pipeline and then is fed into the chimney for being discharged. The invention also provides a fluidized bed system for directly capturing CO2 in the mineralized flue gas. The technology can not only effectively increase the utilization rate of fly ash but also reduce CO2 emission of a power plant, is simple in processes, is convenient to continuously operate, is high in device processing capacity, is small in size and less in occupied area and can be combined with the existing system conveniently. Meanwhile, the decarbonized fly ash does not influence the original use approach of the fly ash from the power plant, thereby achieving a lower decarbonization cost.

Description

technical field [0001] The invention relates to the technical field of flue gas carbon dioxide capture and utilization, in particular to a fluidized bed process and system for directly capturing carbon dioxide in mineralized flue gas. Background technique [0002] The global greenhouse effect caused by the increase in the concentration of greenhouse gases in the atmosphere has caused icebergs to melt, sea levels to rise, species to decrease, and various climate disasters to occur frequently around the world, causing serious economic losses and threatening human survival. carbon dioxide (CO 2 ) as the most important greenhouse gas, its future total control and emission rights allocation have become the focus of international climate negotiations. Governments and energy companies in various countries have paid more and more attention to CO 2 Research on emission control technologies, some countries have taken the lead in starting substantive decarbonization work. With my co...

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Problems solved by technology

However, due to the currently developed CO 2 The mineralization process has the disadvantages of long process, low reaction rate, large equipment size, harsh reaction conditions, high energy consumption, difficult recovery of chemical reagents, secondary pollution, etc., and the main researches abroad are suitable for mineralization raw materials such as serpentine, Olivine and other ores are often used as raw materials for handicraft processing in my country, resulting in high raw material prices

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