Device and process for separating carbonic acid gas by indirect burning of biomass

Abstract

The invention relates to a device used for indirectly burning biomass to separate carbon dioxide and a method which is a burning way of the biomass and a biomass burning process based on a cycle oxygen carrier. The device consists of a circulating fluidized bed, a cyclone separator and a fluidized bed, which is formed into a circulation loop; the method is characterized in that oxidation reaction happens to metal and air in the circulating fluidized bed to generate a metallic oxide which enters the fluidized bed after being separated by the cyclone separator; gasification reaction happens to the biomass in the fluidized bed and the carbon dioxide or water vapour; reduction reaction happens to fuel gas generated from the gasification reaction and the metal oxide to generate the metal, the carbon dioxide and the water vapour, wherein, the carbon dioxide and the water vapour are discharged from an air outlet of the fluidized bed and condensed to obtain pure carbon dioxide and the metal reduced returns to the circulating fluidized bed for carrying out oxidation reaction with the air to complete the regeneration process of the metallic oxide. The carbon dioxide can be separated from combustion products without extra energy consumption.

Description

A device and method for separating carbon dioxide by indirect combustion of biomass technical field The invention relates to a combustion method of biomass, specifically a device and a method for realizing a biomass combustion process based on a circulating oxygen carrier and separating carbon dioxide during the biomass combustion process. Background technique Carbon dioxide is the most influential greenhouse gas among many potential greenhouse gases. How to reduce carbon dioxide emission has become one of the main contents of human sustainable development in the future. The conventional combustion technology is the direct contact combustion of biomass and air, and the carbon dioxide in the generated flue gas only accounts for 10-15%. The subsequent treatment (concentration and purification) of carbon dioxide is too costly, and the following methods are usually used: 1. Separation and purification of carbon dioxide by molecular membrane separation method, the separation e...

AI Technical Summary

Problems solved by technology

1. Separation and purification of carbon dioxide by molecular membrane separation method, the separation efficiency is low and the cost is high

2. Removing carbon dioxide through biological photosynthesis and finding high-efficiency biological algae for large-scale removal of carbon dioxide still need technological breakthroughs

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