Combustion gas desulfurization method

A process for desulfurizing combustion gas wherein solid particles of a desulfurizing agent are injected into a combustion gas and wherein said desulfurizing agent comprises oxides, hydroxides or carbonates of alkaline earth metals, said process comprising the following stages:

• (a) fractionating a stream of the combustion gas into at least two gas streams;
• (b) introducing solid particles of the desulfurizing agent into each one of the at least two streams;
• (c) directing streams containing particles of the desulfurizing agent suspended in the combustion gas resulting from stage (b) towards one another, in order to cause meeting of the streams and mixing thereof in a mixing zone;
• (d) discharging a resulting mixture of gas and of particles of the desulfurizing agent from said mixing zone to another zone;
• (e) fractionating the discharged mixture in said another zone into at least two additional streams, each additional stream being formed by combustion gas and particles of the desulfurizing agent;
• (f) directing the streams resulting from stage (e) towards one another in order to cause the meeting of the streams and mixing thereof;
• and
• (g) fractionating the mixture resulting from stage (f) into a gas, at least partially desulfurized, and into sulfur-enriched particles of said desulfurizing agent;
• the size of the particles of the desulfurizing agent ranging from 1 to 100 micrometers, the rate of flow of the streams meeting in stage (c) ranging from 10 to 80 m/s and the combustion gas resulting from combustion of a sulfur-containing fuel.