The reaction heat released from the sulfur combustion furnace and SO₂/SO₃ converter is recovered and directly converted into steam via a fire-tube boiler.   Compared with conventional processes, this advanced heat recovery system doubles steam production capacity. The generated steam not only satisfies the steam demand of the sulfur melting unit, but also completely meets the cooling requirement of the air drying unit. By adopting a steam-driven lithium bromide chiller to replace the conventional electric chiller for chilled water production, the overall system power consumption is reduced by 15%.