How are the diameter and height of the desulfurization tower in a dry desulfurization unit determined, and how is the weight of the desulfurizing agent determined?
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We have a biogas project that uses dry desulfurization; the processing capacity is 1000 Nm^3/h, the inlet pressure is 10 kPa, and the inlet temperature is 40 degrees. The H2S concentration at the inlet of the desulfurization unit is 3200 mg/Nm^3, while the required H2S concentration at the outlet is less than or equal to 150 mg/Nm^3. How is the diameter and height of the desulfurization tower in such a desulfurization unit determined? How is the weight of the desulfurizer determined?
The desulfurization efficiency is over 95%, and it seems that such an efficiency is relatively easy to achieve; however, it doesn’t meet the current environmental standards, as the level of H2S after treatment is too high. It is recommended to set stricter requirements for the H2S level downstream of the tower. With your current requirements, a tower diameter of 0.9 meters is sufficient, but the sulfur capacity still needs further consideration, given that the concentration of sulfur entering the tower is too high. I don’t understand how biogas, which is considered a clean energy source, can have such high levels of H2S. The liquid-to-gas ratio depends on factors such as the desulfurizing agent used and other parameters. Desulfurizer weight-----I’m not sure; in wet desulfurization, what does the weight of the desulfurizer refer to? The data you’ve provided now is too simple; if it were more detailed, I might be able to explain things more thoroughly
Thank you for your reply! The H2S content coming out of the desulfurization tower is provided by the customer; it seems that they are not sure about this value either. The weight of the desulfurizer refers to the amount of desulfurizer filled in the desulfurization tower. Based on the data above, how do you determine the diameter of the desulfurization tower? Could you explain the calculation method?
You’re online; so you are the design team, not the client. You should know the specific criteria for the design
With such strict environmental regulations these days, after you complete the construction, the owners will still have to carry out further modifications due to non-compliant emissions. If you explain the situation to them, they will think they have chosen the right design firm and will trust you even more. In terms of design, based on those few parameters such as the empty tower velocity, liquid-to-gas ratio, residence time, sulfur capacity, etc., the circulation rate, water volume, load, etc. are determined; from these, the power level and the volume of the tanks are also determined
Huh? Just saw it’s dry desulfurization!
The tower diameter is calculated based on the gas-liquid load inside the tower. The amount of desulfurizer used is also calculated; a simple way to do this is by using software.
This should be calculated based on the desulfurization agent. Desulfurization involves parameters such as space velocity, desulfurization efficiency, and sulfur capacity; by using these parameters, the amount of desulfurization agent required can be determined from an economic perspective. Once that is known, the appropriate desulfurization tower can be selected. It’s sufficient to refer to some standard charts to find out which option is suitable, and then the diameter can be determined.
Could you share the detailed calculation process? Thank you!
The technical specifications for large and medium-sized biogas projects specify that the sulfur content in the electricity-generated gas should not exceed 200 mg/m3, while for domestic centralized gas supply it should not exceed 20 mg/m3.