Take a look at these photos of the steam superheater – what are your thoughts?
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The 1.0MPaG steam superheater is designed with a capacity of 3.4MW. It consists of 24 vertical radiant sections made of 219×8.18 optical tubes, as well as 40 horizontal convective sections made of 168×7.11 finned tubes. Both the radiant and convective sections have 4 tube passes. The tube material is 12Cr1MoVG, while the fin material is 0Cr13. The height of the radiation chamber is 7 m, the pitch diameter of the furnace tubes is 3.1 m, and the horizontal distance between the burner’s centerline and the furnace tubes’ centerline is 0.8 m. Inlet saturation is 192°C, outlet design temperature is 250°C, and the maximum steam flow rate is 86 tons. The design temperature of the flue gas upon leaving the radiation section is 754°C, and 235°C upon leaving the convection section; the flue gas flow rate is 5760 kg/h. The furnace is equipped with three LPG burners, 3×1.7MW.
It’s hard to imagine the dirt being that severe.
The furnace tubes have all burned through and collapsed.
The metals softened at high temperatures, and the finned tubes collapsed.