What are the conditions of NHD desulfurization process?
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Are there any problems in production that can affect the effect of NHD desulfurization?
①Effect of air velocity: Gas absorption is a mass transfer process involving diffusion between gas and liquid phases. Air flow velocity directly affects this mass transfer process. ②Effect of spray density: If the spray density is too high, the solute efficiency of the absorbing liquid will be reduced. If the spray density is too small, the purity of the absorbed gas cannot be guaranteed. ③Effect of temperature: Lowering the temperature can increase the degree of gas absorption. ④effects of stress: Because gas absorption is a single-phase mass transfer process from the gas phase to the liquid phase, increasing the system pressure is beneficial to absorption. ⑤Effect of absorption concentration: The lower the concentration of absorbent contained in the absorbent, the more gas will be absorbed at the same gas concentration. ⑥Water content in NHD desulfurization solution.
The answer above is very good, mainly including temperature, pressure, air flow speed, spray density, and absorbent concentration. hehe
Now NHD desulfurization technology is outdated! The leading technology now is the low-temperature methanol washing process!
Suet has demonstrated in other posts that the NHD method is more economical for small-scale methanol production (below 20W/a). Low-temperature methanol washing is suitable for large methanol, with high investment and low operating costs. To supplement the posts on the 1st and 2nd floors, the H2S content in the furnace gas, the solution circulation volume, and the content of low-molecular polyethylene glycol dimethyl ether in the solution also have a certain impact on absorption.
Just to add: There is also solution regeneration degree (if H2S cannot be regenerated, is it still capable of being absorbed again), solution water content (if the water content is high, the active ingredients: The absorbent component is lower)
Your factory must have NHD for C removal. The conditions that affect C removal actually affect S removal, because their removal principles are exactly the same.
NHD desulfurization and decarbonization is not outdated. Low-temperature methanol washing also has shortcomings and requires high cooling capacity. For companies that lack cold sources, NHD does have some room for choice.