PROCESS FOR THE DRY DESULPHURISATION OF A COMBUSTION GAS

摘要

The process for dry desulfuration of a combustion gas includes providing an electrostatic precipitator (12) or an inertia force separator for dedusting; dedusting the combustion gas at temperatures of 100 DEG C. to 180 DEG C. in the electrostatic precipitator or at temperatures of 100 DEG C. to 700 DEG C. in the inertia force separator to form a partially dedusted combustion gas with a solids content of 5 to 40 g/Nm3; mixing the partially dedusted combustion gas with CaO and/or Ca(OH)2 and optionally CaCO3 to form a gaseous mixture; providing a circulating fluidized bed device including a fluidized-bed reactor (8) and a downstream solids separator (7) with a return line (17) to the fluidized-bed reactor (8), the solids separator (7) being either another electrostatic precipitator or a bag filter; feeding the gaseous mixture and water into the fluidized-bed reactor (8); cooling the gaseous mixture in the fluidized-bed reactor (8) to a temperature of 50 DEG C. to 90 DEG C.; withdrawing a solids-containing gas from an upper portion of the fluidized-bed reactor (8); feeding the solids-containing gas into the solids separator (7) to form separated solids and a cleaned gas; recycling one portion of the separated solids into the fluidized-bed reactor (8) and mixing another portion of the separated solids with the combustion gas.