| This article introduces main process of gas desulfurization,analyzes the existing problems in the productive practice of vacuum potassium carbonate desulfurization,and does some research on the existing problems.The equipment was upgraded on the basis of theoretical demonstration,and the results after the implementation were tested.The H2S content after alkali washing can reduce 300 mg/m3 by the new vertical sieve trays instead of the film spray tray,which meets the design requirement.The reasons for the blackening of the desulphurizing liquid and the countermeasures are found.The analysis shows that the excessive ammonia content in the gas is the direct cause of the blackening of the desulphurizing liquid.By increasing the buffer tank,the ability to resist the impact of the desulfurization system is improved.The process of optimizing the acid gas analysis system is to change the acid gas cooler into parallel,to design the liquid discharge system of acid gas pipe,and to optimize the operation.The vacuum degree of the analytic tower is raised from-81.5 k Pa to-86 k Pa,and the designed standard will be reached.The conversion rate of SO2 is increased from 92% to 96% and the content of SO2 in exhaust gas is reduced from 2000-3000 mg/m3 to 900-1100 mg/m3 by a series of measures including reducing the heat exchange area of the exhaust gas cooler,replacing the filter element and cake of mist catcher and adding the acid gas connected pipe.Design of exhaust gas treatment process by adding the exhaust gas washing tower,using the 5%Na OH solution of the alkali washing section of the desulphurization tower for circulating spraying,thus the content of SO2 in the exhaust gas is reduced from 1000 mg/m3 to about 40 mg/m3,and the effect is remarkable.Through continuous technological optimization and improvement for many years,the gas index of desulphurization and acid making process has been achieved,and the exhaust gas emission index has reached the standard,and the production operation is stable. |
PDF Full Text Request