The application discloses a method for producing carbonized
fly ash brick by improved
coal gas shift process, which comprises the following steps: 35-80%
carbon monoxide in the
coal gas enters a first shift
tower in a way of
water vapor:
carbon monoxide 1.2-1.5:1, the
carbon monoxide is reduced to 15-27% by the first shift, the temperature is adjusted to be lower than 350 DEG C, the indirect heating is sent to a basic
magnesium carbonate water regeneration
tower 1, the water absorbed by the regenerated basic
magnesium carbonate is above 250 DEG C steam, meanwhile, the temperature of the reduced shift gas 1 is 20-30 DEG C higher than the
steam temperature, the shift gas 1 is sent to at least two
carbon dioxide absorption towers containing
fly ash cement compressed blocks to absorb
carbon dioxide, the
carbon dioxide in the shift gas 1 is reduced by 20-85%, the outlet gas of the absorption
tower and the steam generated by the basic
magnesium carbonate regeneration tower 1 are sent to second and third shift furnaces, the carbon
monoxide is reduced to 0.5-1.5% by the second and third shifts, and the gas is called water-rich shift gas and is directly sent to at least two
water vapor absorption towers 2 containing basic magnesium carbonate to absorb
water vapor and then sent to a later section, and the application is beneficial to realize the
recovery of the water vapor in the shift gas and the solidification of part of the carbon dioxide.