Patent ID: 8287830

Claim:
A method for preparing ammonium bicarbonate with flue gas, comprising: (1) quantitatively collecting flue gas with a carbon dioxide concentration of about 8% to about 15% (volume) by a flue gas collecting apparatus disposed downstream of an exhaust outlet of a boiler; (2) decreasing the temperature of the flue gas to about 50Â° C. or less with an air-cooling apparatus disposed downstream of the flue gas collecting apparatus, wherein the air-cooling apparatus comprises an air-cooling channel, the air-cooling channel is a piping which comprises at least one thin steel pipe with a pipe wall thickness of about 3 to about 4 mm and an outer diameter of about 20 to about 30 cm; (3) increasing the pressure of the flue gas to about 0.6 to about 1.2 MPa with a gas storing and pressurizing apparatus; and (4) allowing the pressurized flue gas to react with ammonia to produce the ammonium bicarbonate in an ammonium bicarbonate synthesizing apparatus.