Correspondence between desulfurization hydrogen sulfide and soda ash consumption by PDS method
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Our factory uses the PDS method for desulfurization. I would like to ask if there is a certain relationship between the removal of one milligram of hydrogen sulfide and the consumption of soda ash. It would be best if you could tell me the relationship between the formulas and the like. Thank you!
This theoretical value can be calculated through calculation! ! ! But in practice, there will be a certain margin due to the uncertainty of operations and parameters!
Alkaline aqueous solution absorbs H2S (under the catalysis of PDS) NA2CO3+H2S→NAHCO3+NAHS NAHS+(X-1)S+NAHCO3→NA2SX+CO2+H2O RSH+NA2CO3→RSNA+NAHCO3 COS+2NA2CO3+H2O→NA2CO2S+2NAHCO3
Regeneration reaction 2NAHS4+O2→8S+2NAOH NA2Sx+1/2O2+H2O→Sx+2NAOH 2RSNA+1/2O2+H2O→RSSR+2NAOH NA2CO2S+1/2O2→NA2CO3+S
The advantages of the pds method are high desulfurization efficiency. While desulfurizing and removing H2S, it can also remove about 60% of organic sulfur. The regenerated sulfur particles are large and easy to separate. The sulfur recovery rate is high, the tower is not blocked, and the cost is low. PDS is non-toxic, and the desulfurization liquid does not corrode equipment.
If the gas contains few other impurities that can react with sodium carbonate, you can add it at the ratio of 1g sodium carbonate + 1mg catalyst/g hydrogen sulfide.
Right? I feel that what the poster said is a little low, and I am not sure about sodium carbonate. Our PDS desulfurization method works better when the ammonia-sulfur ratio is around 1. If the ammonia-sulfur ratio is lower than 0.7, it seems that the desulfurization efficiency is affected. If it is lower than 0.4, it seems that the operation is poor. The ammonia-sulfur ratio I am referring to is: Volatile ammonia/hydrogen sulfide
To remove one milligram of hydrogen sulfide, NA2CO3+H2S→NAHCO3+NAHS, you can calculate how much soda ash is needed through this reaction equation. Hahahaha, slowly calculate it!
Sir, could you briefly introduce to me the specific process flow of PDS desulfurization?