Hazardous waste treatment process:
Hazardous waste in the rotary kiln for high-temperature decomposition and combustion reaction, the waste is greatly reduced, part of the residue from the rotary kiln is discharged directly after the combustion chamber directly dropped in the second combustion chamber of the lower part of the grate on the combustion again, combustion by the slagging system continuously discharged after the combustion of the rotary kiln incineration of the flue gas into the second combustion chamber Further combustion, the exit flue gas temperature of the second combustion chamber is guaranteed to be maintained above 1100℃, and the residence time of the flue gas is more than 2 seconds, so that the organic matter and dioxin in the flue gas can be decomposed completely to achieve the purpose of harmlessness.
The high-temperature flue gas produced by the second combustion chamber enters the waste heat boiler to recover part of the energy to produce steam. The temperature of the flue gas after the waste heat boiler is reduced to between 500℃-600℃. The flue gas is then cooled and neutralized by the flue gas neutralization tower to reduce the temperature to between 200℃-180℃ to avoid the resynthesis of toxic gases such as dioxins.
The flue gas after emergency cooling enters the dry reaction device, in which activated carbon and Ca(OH)2 are sprayed to further deacidify the flue gas and adsorb the heavy metals and dioxin that may be re-produced, and then it enters the baghouse dust collector for dust removal. Then the flue gas enters the SCR nitrogen removal device to remove nitrogen oxides.
The last process of flue gas purification is wet deacidification, in which lye is sprayed into the wet deacidification tower to remove SO2, HCl, HF and other acid gases, to meet the strict flue gas emission standards. Finally the purified flue gas is heated to eliminate white smoke and then sent to the chimney through the action of the induced draft fan to be discharged into the atmosphere.