The 50,000 tons / year sulfur recovery unit is accelerating the construction progress according to the time point. As of press time, civil construction has been completed 96%, equipment installation has been completed 96%, steel structure has been completed 95%, prefabrication of process pipes has been completed 86,000 inches, and chimney construction has been completed . 90% of the electrical is completed, including electrical bridges, electrical piping, grounding 95%, lighting, 60% of the instrumentation, 96% of the instrumentation bridge, 80% of the instrumentation pipe, and laying of pressure pipes 40% completed, 70% of instrument cable laying completed.