Device for separating carbon dioxide through chemical-looping combustion in coal pressurizing high-density recirculating fluidized bed

Abstract

The invention discloses a device for separating carbon dioxide through chemical-looping combustion in a coal pressurizing high-density recirculating fluidized bed. Gasification reaction is carried out on coal particles and a gasification agent in a pressurizing high-density recirculating fluidized bed fuel reactor 1; and a gasification product and an oxygen carrier returning back to the fuel reactor 1 performs redox reaction to generate CO2 and H2O. The device comprises the pressurizing high-density recirculating fluidized bed fuel reactor (1), a primary cyclone separator (2), a primary dipleg (3), a fresh oxygen carrier particle feeder (4), a cross flow moving bed air reactor (5), a grid plate (6), an inactivation oxygen carrier discharging device (7), a primary material returner (8), a primary exhaust pipe (9), a secondary cyclone separator (10), a secondary exhaust pipe (11), a secondary dipleg (12) and a secondary material returner (13). By using the device in the invention, the reaction matching problem caused by the quantity grade difference existing in combustion and the oxygen carrier reaction rate is solved, thus the combustion efficiency of the coal, the separated CO2 concentration and the final gathering rate of the CO2 are greatly improved.

Description

technical field [0001] The invention relates to a coal chemical looping combustion separation CO 2 The device belongs to the field of clean combustion and efficient utilization of fuel. technical background [0002] 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. Chemical Looping Combustion (CLC) is an internationally recognized CO2 with important prospects. 2 One of the emission reduction technologies. Its basic principle is that the fuel does not burn directly in contact with the air, but the combustion process is realized by the alternating reaction of the oxygen carrier between the two reactors: on the one hand, the oxygen carrier is used to separate the oxygen in the air in the air reactor. Oxygen, on the other hand, in the fuel reactor, the oxygen in the air is transferred to the fuel by the oxygen car...

AI Technical Summary

Problems solved by technology

Since the combustion reaction rate of coal / oxygen carrier is different from the oxygen carrier reaction rate of oxygen carrier by 2 to 3 orders of magnitude, it is difficult for conventional systems to achieve an optimal match between the combustion reaction of coal / oxygen carrier and the oxygen carrier reaction of oxygen carrier. Therefore, there has not been an internationally recognized process technology route so far.

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