Method for treating arsenic-containing flue gas

A method for treating arsenic-containing flue gas, comprising:

• subjecting the arsenic-containing flue gas to a dry pre-dedusting treatment, to obtain dedusted flue gas;
• pre-cooling the dedusted flue gas and introducing the pre-cooled flue gas into a vortex quenching system to obtain high-temperature flue gas and low-temperature flue gas;
• and
• subjecting the low-temperature flue gas to a gas-solid separation to obtain treated flue gas and arsenic trioxide,
• wherein pre-cooling the dedusted flue gas comprises introducing the dedusted flue gas into a heat energy utilization system and cooling.

A method for treating arsenic-containing flue gas, comprising:

• subjecting the arsenic-containing flue gas to a dry pre-dedusting treatment, to obtain dedusted flue gas;
• pre-cooling the dedusted flue gas and introducing the pre-cooled flue gas into a vortex quenching system to obtain high-temperature flue gas and low-temperature flue gas;
• and
• subjecting the low-temperature flue gas to a gas-solid separation to obtain treated flue gas and arsenic trioxide,
• wherein the vortex quenching system comprises a gas inlet pipe, a gas inlet spray nozzle, a vortex chamber, a low-temperature gas outlet, a high-temperature gas buffer chamber, a gas outlet adjustment valve, and a high-temperature gas outlet, wherein the gas inlet spray nozzle is arranged at the top of the vortex chamber;
• the gas inlet pipe is connected to the gas inlet spray nozzle;
• the low-temperature gas outlet is arranged on one side of the vortex chamber;
• the high-temperature gas buffer chamber is arranged on the other side of the vortex chamber;
• the high-temperature gas outlet is arranged in one end, far away from the vortex chamber, of the high-temperature gas buffer chamber;
• and the high-temperature gas outlet is provided with the gas outlet adjustment valve.