The issue of sulfuric acid concentration in acid production using the WSA process for acidic gases
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In the WSA wet acid production process for Topso acidic gas, there is no process gas drying or dehumidification unit; therefore, the concentration of sulfuric acid produced must be determined by the composition of the acidic gas, right? Also, does the moisture in the combustion air need to be removed? If the moisture in the air is not removed, will the concentration of sulfuric acid also decrease during heavy fog or heavy rain?
The inlet and outlet temperatures of the condenser are controlled according to the design values, and the sulfuric acid concentration is not affected by external factors
Does that mean that by controlling the operation of the condenser, the sulfuric acid concentration can be properly controlled? Is the sulfuric acid concentration related only to the operation of the condenser, and has nothing to do with the composition of the acidic gases or the moisture content in the air?
The concentration of acid formed in the condenser is related to the concentration of sulfur trioxide and water vapor in the flue gas (i.e., the moisture content in the acidic gases and in the air). Due to the characteristics of the condenser, the range of this acid concentration remains relatively constant, around 97%. Theoretically, the lower the moisture content in the raw materials and air, the higher the concentration of acid that can be formed; however, the moisture content in the flue gas cannot be too low, otherwise the amount of acid mist exiting the condenser will increase.
The concentration of acid formed in the condenser is related to the concentration of sulfur trioxide and water vapor in the flue gas (i.e., the moisture content in the acidic gases and in the air). Due to the characteristics of the condenser, the range of this acid concentration remains relatively constant, around 97%. Theoretically, the lower the moisture content in the raw materials and air, the higher the concentration of acid that can be formed; however, the moisture content in the flue gas cannot be too low, otherwise the amount of acid mist exiting the condenser will increase.
It’s relatively complex; the sulfuric acid condensation in the condenser is a dynamic equilibrium, and the acid concentration is primarily determined by the temperature of the process gas at the exit of the condenser