Fluctuations in hydrogen sulfide desulfurization using vacuum potassium carbonate
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The hydrogen sulfide removal efficiency using vacuum potassium carbonate for desulfurization fluctuates frequently, ranging between 100-250 PPm. The flow rate of the lean liquid is 175 cubic meters, the temperature is 30 degrees Celsius, the temperature at the top of the regeneration tower is 55-56 degrees Celsius, the suction pressure is 79 KPa, and the flow rate of the vacuum condensate is 12-15 cubic meters. The values related to desulfurization and regeneration remain relatively stable; it’s only the hydrogen sulfide level that fluctuates. Could someone with expertise give some advice?
Check the color of the desulfurization liquid and the condition of the rich liquid
You’ve provided too little data; there are many possibilities
The lean solution is dark yellow but not black; the rich solution is yellow. The hydrogen sulfide level in the lean solution is above 1.5, while it is above 3.5 in the rich solution. The total potassium level is currently a bit high, around 100.
The salt content is not high, around 5.
The color of the lean liquid is a bit dark; it should be light yellow. The hydrogen sulfide level in the lean liquid should be kept at around 1.0 g/l. If the total potassium level is high, potassium supplementation can be stopped. Test potassium thiosulfate and potassium thiocyanate. The discharge of desulfurization liquid can be increased to replace it. Restore the desulfurization color to normal. If it still doesn’t work, the regenerator tower needs to be checked.
What issues need to be checked on the regeneration tower?
Check the airtightness of the regeneration tower; inspect whether the distribution plates inside the tower are corroded, resulting in uneven liquid distribution, and check whether the packing inside the tower has collapsed and leaked to the bottom of the tower.