Case Study: Chelated Iron vs. PDS sulfur removal catalyst in HPF Process
Based on field application of our chelated iron catalyst in the HPF process and comparison of operating parameters with PDS catalyst, the following conclusions can be drawn:
Under identical system and process conditions, the H₂S removal efficiency of chelated iron is significantly higher than that of PDS.
The total operating cost using chelated iron catalyst is lower than PDS, with a cost reduction of over 20%.
The substantial reduction of H₂S at the tower outlet and the elimination of waste liquid bring considerable environmental benefits to the plant.
| Parameter | PDS | chelated iron catalyst | remark |
|---|---|---|---|
| H₂ S content after scrubber (mg/Nm³) | 70-320 | 0-30 | |
| Total salt content (thiosulfate & thiocyanate) (g/L) | About 360 | About 290 | |
| Waste liquid discharge (m³/d) | 40 | 0 | |
| Sulfur production (t/d) | 7 | 11 | |
| Daily catalyst consumption cost | CNY 4500 | CNY 15600 | |
| Salt recovery cost | CNY 14000 | 0 | |
| Total operating cost | CNY 18500 | CNY 15600 | This cost figure excludes additional savings from reduced power consumption due to a 200 m³/h lower system circulation rate, reduced operational load and cost for downstream flue gas desulfurization resulting from greatly improved outlet H₂S removal, and the avoided treatment cost of recovered mixed salts. |
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