Desulfurization process for hydrogen sulfide levels greater than 6 g/m in front of the tower
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The hydrogen sulfide content in the gas before the desulfurization tower is greater than 6 g/m3
Operational error. The question is: The hydrogen sulfide content in the gas before the desulfurization tower is greater than 6 g/m3; what process is suitable in this case?
Both the HPF ammonia-based desulfurization process and the vacuum potassium carbonate desulfurization process can be used; with proper operation, a desulfurization efficiency of 98% is easily achievable
With HPF ammonia desulfurization, the sulfur content in gas with a level of over 6 g/m3 cannot be reduced to less than 500 mg/m3 in the gas exiting the tower.
HPF ammonia-based desulfurization can reduce the sulfur content in gas with a level of over 6 g/m3 to less than 500 mg/m3 in the gas exiting the tower
Typically, coking plants require the sulfur content in the gas after the tower to be less than 300 mg/m3; is 500 mg/m3 too high?
1. If the hydrogen sulfide requirement behind the tower is not strict, such as around 500, single-tower desulfurization can be considered, but this is likely only a temporary solution； The requirement is that the level should be below 50 milligrams; therefore, a dual-tower desulfurization system must be installed ； 2. It is necessary to have an appropriate excess amount for desulfurization absorption and regeneration ； 3. Decide whether to use a gas pre-cooling unit based on the temperature of the gas ； 4. Decide whether to use sulfur paste or ammonia from the rapid sulfur production method based on market demands ； 5. Consideration of treatment measures when the system’s by-product salts are too high ； 6. Anti-corrosion measures within the system must be properly implemented. This post was last edited by ryn on 2009-2-16 09:19]
Pre-deactivation using the first two turbulent ball towers can be considered, followed by desulfurization in the main tower, thereby ensuring the desired desulfurization standards.
PDS+ hydroquinone method: hydrogen sulfide level is greater than 7 g/m3 before desulfurization, and less than 20 mg/m3 after desulfurization. The desulfurization effect is excellent!
First, let’s take a look at the specifications for H2S levels after desulfurization in your plant; it is recommended to connect the two desulfurization towers in series
In HPF ammonia-based desulfurization, it is essential to ensure that the ammonia-to-sulfur ratio meets the required standards; if the sulfur concentration before the tower is above 7 g/m3, it would be good if the hydrogen sulfide concentration after the tower remains below 300 mg/m3. The vacuum potassium carbonate desulfurization process achieves better desulfurization results, but it has higher operating costs. The PDS+ hydroquinone method is no longer recommended for use.
The desulfurization efficiency of the vacuum potassium carbonate desulfurization process is not necessarily better than that of the HPF ammonia-based desulfurization method; it simply does not have the problem of untreated waste liquid. The operating costs depend on the price of sulfur or sulfuric acid; in 2008, the operating costs for potassium carbonate-based vacuum desulfurization were significantly lower than those of HPF ammonia-based desulfurization for systems of similar scale
The process used by our company is the PDS+hydroquinone method; before desulfurization, the hydrogen sulfide level is above 7 g/m3, while after desulfurization it is below 20 mg/m3. Turbulent ball tower + desulfurization tower, dual-tower regeneration. The effect is very good; the purified gas is used to produce methanol.
Where can I find information on turbulent ball towers and desulfurization towers?
Under the conditions you mentioned, the HPF method should be able to reduce the level to below 100 mg, while the vacuum potassium carbonate method should be able to keep it below 150 mg
Dear moderator ldy6230016, which factory do you work for? The PDS+ hydroquinone desulfurization process uses a turbulent ball tower and a desulfurization tower, with regeneration in both towers. Is wet desulfurization still required for the production of methanol from gas? What is the stability of this desulfurization method?
13th floor: Where is your company located? “Turbulent ball tower + desulfurization tower, dual-tower regeneration. The effect is very good; the purified gas is used to produce methanol. ”Is the process in use currently? I’m thinking of visiting your company.
Methanol production from coke oven gas involves wet desulfurization first, followed by dry desulfurization if necessary, to meet the requirements of methanol production. This process is very stable.
Tengzhou Shenglong Coal Coking Company is currently using it; you can go and take a look
The vacuum potassium carbonate desulfurization process is quite good; the desulfurization effect is excellent!
Connecting the two towers in series is feasible, but it does increase the resistance significantly