The invention relates to a secondary 
combustion chamber emergency discharging 
chimney tail gas purification 
system. A secondary 
combustion chamber discharging 
chimney, a Venturi dust remover, a dilutealkali liquor tank, a circulation pump, a 
cyclone water removal dust remover, an induced draft fan and an exhaust 
barrel are included. The secondary 
combustion chamber discharging 
chimney communicates with the Venturi dust remover, the Venturi dust remover communicates with the 
cyclone water removal dust remover, the 
cyclone water removal dust remover communicates with the exhaust 
barrel, the induced draft fan is arranged between the cyclone water removal dust remover and the exhaust 
barrel, and the dilute alkali liquor tank communicates with the 
throat position of the Venturi dust remover through the circulation pump. The secondary 
combustion chamber emergency discharging chimney 
tail gas purification 
system is suitable for industry 
hazardous waste incineration system secondary 
combustion chamber emergency discharging chimney 
tail gas treatment, since the tail gas is discharged under the accident work condition, the 
application time of the system is short, the construction cost is low, and running is stable and reliable; and in the general background that 
smoke is not treated in the industry, a feasible 
smoke treatment environment protection measure is provided, gas exhausted bythe secondary 
combustion chamber emergency discharging chimney tail gas purification system is more environment-friendly, and 
pollution to the surrounding environment is effectively avoided.