Solution to desulfurization using the sodium carbonate method
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In the sodium carbonate method for desulfurization, the concentration of sodium carbonate in the desulfurization solution is 3 mg/L, that of sodium bicarbonate is 9 mg/L, ammonia content is 12 mg/L, and the total alkalinity is 50 mg/L (calculated as sodium carbonate). From the analysis of the desulfurization liquid, it can be seen that the alkalinity of the liquid is mainly due to ammonia. Originally, the design called for desulfurization using the sodium carbonate method; now, given the high concentration of ammonia, isn’t this essentially ammonia-based desulfurization? But the reaction between ammonia and hydrogen sulfide produces ammonium sulfide. It seems that ammonium sulfide undergoes double hydrolysis easily; doesn’t that mean it reverts back to ammonia and hydrogen sulfide?
Basically, it can be concluded that all the units you wrote are incorrect: 3 mg/L of sodium carbonate and 12 mg/L of ammonia. Can this really desulfurize? 3 g/L sodium carbonate and 12 g/L ammonia are about right. Is it that in your plant, you first implemented ammonia-based desulfurization, and then added soda ash to the solution without replacing it; or even added both soda ash and ammonia? A catalyst should also be added. Do some research to learn more.
My hand trembled, haha. The unit is g/L. The design calls for desulfurization using the sodium carbonate method. However, during trial runs, it was found that the ammonia concentration is quite high. Since the sodium carbonate method is used for desulfurization, the catalyst must be intended to catalyze sodium carbonate reactions. Currently, the amount of ammonia in the system is much higher than that of sodium carbonate; I’m worried this might cause problems in the system
The role of the catalyst is not to participate in the reaction, but to increase the rate or capacity of absorption, thereby reducing the amount of solvent used or recycled. Additionally, the reaction between hydrogen sulfide and ammonia produces ammonium hydrosulfide rather than ammonium sulfide. Moreover, the reverse process itself is necessary; the rich solution must be regenerated through this reverse process to become a lean or semi-lean solution for reuse. Lastly, whether sulfides are absorbed (in the desulfurization process) or released (in the regeneration process) depends primarily on several key factors: temperature, pressure, the concentration of substances in the solution, and the partial pressure of those substances in the process gas. Generally speaking, increasing the pressure (while also increasing the partial pressure of sulfides) and lowering the temperature can enhance the efficiency of adsorption/absorption. Conversely, decreasing the pressure and raising the temperature can cause the sulfides to be released, thereby regenerating the absorbent solution. Therefore, by adjusting process conditions such as temperature and pressure, the desulfurization process can be carried out repeatedly; only appropriate replenishment is required during this process
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