Reconstruction of sulfur recovery exhaust gas

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The sulfur recovery unit in our facility was installed 10 years ago, using a two-stage Claus process combined with a one-stage super Claus process. Since the introduction of the new standards for atmospheric pollutant emissions, sulfur dioxide emissions no longer meet the required levels. Is it feasible to modify the combustion chamber used in the thermal power plant? The boiler in our facility is a water-wall boiler. Could all the Sichuan friends help analyze and solve this problem? The design parameters are as follows: Temperature: 122°C, Pressure: 0.92 barabs. The gas composition is shown in the table below: Component Mol% Kmol/h H2S 0.015 0.0137 SO2 0.139 0.1247 COS 0.031 0.0280 CS2 0.001 0.0005 S6 0.001 0.0006 S8 0.004 0.0038 CO 2.228 2.0005 H2 0.529 0.4748 CO2 67.347 60.4730 O2 0.501 0.4499 N2 3.671 3.2966 Ar 0.045 0.0407 H2O 25.487 22.8856 89.7926 2011.352 Nm3/h