What causes high hydrogen sulfide levels in exhaust gas?
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The temperature at the furnace tip of the sulfur production furnace is around 1300 (the thermometer in the middle is broken); the ratio of hydrogen sulfide to sulfur dioxide remains relatively stable around 2. The temperature at the inlet of the first reactor is 240, while it is 300 at the outlet； Inlet at 223°, outlet at 232° ； The temperature in the quench tower is 40°. The amount of diethanolamine used in the absorption tower has reached its maximum level; the plant is not yet operating at full capacity. However, the hydrogen sulfide content in the purified exhaust gas is between 260–340 ppm, while the total sulfur content is 670 ppm. What do you think could be the reason for such high levels of hydrogen sulfide in the purified exhaust gas?
1. It could be a problem with the absorption tower, such as clogged trays. 2. It may be a problem with amine solution regeneration; the quality of the lean amine solution is poor. 3. It may be due to internal leakage in the rich-amine and lean-amine heat exchanger, as well as poor quality of the lean-amine fluid.
Test the hydrogen sulfide content at the inlet and outlet of the absorption tower. Check whether the cross-line valve is leaking.
1. Observe the approximate combined level of hydrogen sulfide and sulfur dioxide using the ratio analyzer; the conversion rate should be high, with the total value generally being less than 0.75%. 2. Analyze the levels of hydrogen sulfide and organic sulfur at the inlet and outlet of the hydrogenation reactor, as well as the temperature rise in the catalyst bed. 3. Check the pressure difference in the absorption tower; the pressure drop across each tray in the tower should be around 0.8 kPa. If this value is exceeded, it is possible that the float valves in the absorption tower become clogged. 4. Quality of the lean liquid: 1) The regeneration of the lean liquid is not satisfactory; 2) There are issues with the quality of the lean liquid itself – free amine levels decrease while bound amine levels increase; 3) There is internal leakage in the heat exchanger, leading to mixing of different substances; 4) The concentration of the amine solution is either too high or too low. 5. The temperature of the absorption system is not at an appropriate level. These reasons can be used as a reference for analysis
The hydrogenation effect is poor. Is the hydrogen content in the hydrogenation reactor low?
Just wash it at the end, and all problems will be solved:lol
Hydrogenation involves reducing sulfur dioxide to hydrogen sulfide; a shortage of hydrogen simply results in higher levels of sulfur dioxide at the outlet of the absorption tower