NOUFERROUS METALLURGICAL EQUIPMENT

Stack is an important and indispensable structure of industrial enterprises, and it is also an important facility to discharge off-gas, through which waste gas is discharged into the surrounding air. Wet desulfurization process has high efficiency in removing SO2 in off-gas, but low efficiency in removing SO3 which is the main component causing off-gas corrosion. Therefore, after off-gas desulfurization, the potential corrosion of the stack is not eliminated, on the contrary, the off-gas environment after desulfurization will further aggravate the corrosion situation. This paper analyzes the corrosion mechanism of off-gas after wet desulphurization, describes the common structure forms of stack to discharge off-gas, summarizes the principle of structure selection of stack to discharge corrosive off-gas, and introduces the categories of stack lining and eight common anti-corrosion lining materials of stack. The stack to discharge off-gas after wet desulfurization shall adopt suitable anti-corrosion lining material according to actual engineering conditions.