The WSA acid-making unit would be apt to short stable operation,low quality of sulphuric acid product and huge pressure of strict environmental requirement due to blockage and corrosion,etc..Through optimization of desulfurizer liquid purification,upgrading of gas-liquid separation in feed gas,optimization of process gas thermal insulation and modification on the boiler feed water system,the operating rate of the system can increase from 78% to 97% plus,the recovery rate of sulfuric acid product can increase from 0.19% to 0.23% so as to realize stable operation of long-process WSA acid-making.

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