Please tell me, are there any successful cases of semi-water gas mixed alkali desulfurization?
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Are there any successful cases of semi-water gas mixed alkali desulfurization? Mixed alkali is a method in which Na2CO3+NaoH is added to the desulfurization system as an alkali source for desulfurization. It is said that it can reduce alkali consumption for a large amount of money. If you know the situation, you can discuss it. :P
Someone has done relevant experiments and concluded as follows:: (1). The H2S removal process was studied using a mixture of sodium hydroxide and sodium carbonate as the alkali source and 888 as the catalyst. The influence of the concentration and proportion of each component in the mixed alkali on the alkali consumption during the desulfurization process was discussed. The test results showed that using the mixed alkali as the alkali source can reduce the alkali consumption. (2). The experiment determined the appropriate process conditions: The mixed alkali ratio is sodium hydroxide 0.08mol/L and sodium carbonate is 0.16mol/L. At this time, the alkali consumption is the lowest. I want to know, how low can it be reduced? What are the relevant data? :P
As far as I know, it has not been used in industry yet.； In fact, desulfurization alkali consumption has nothing to do with this, and is basically the same in theory. If you want to reduce alkali consumption, it is recommended to pay more attention to the regeneration operation and the selection of desulfurization agent.
Thanks for the reply! However, Shandong Pingdu Qingdao Alkali Industry Co., Ltd. uses mixed alkali method to reduce alkali consumption, and the results are good. Li Jinxiao and Liu Binghai of the plant once published a paper summarizing that the alkali consumption can be reduced by 60,000 yuan every year. At the same time, the tower blocking phenomenon is reduced. Is it true? :handshake :o
The secondary desulfurization of our unit's shift gas uses soda ash and ammonia water, mixed alkali desulfurization.
It is said that it can reduce alkali consumption. If you know the situation, you can discuss it. Thank you! ! :lol :handshake
Our factory uses mixed alkali and 888 catalyst, which is a continuous melting sulfur kettle.
Excuse me, what is the gas processing capacity of your plant? How much hydrogen sulfide is imported? What is the amount of NaOH and Na2CO3 added? Where are you from? Please reply! :handshake :lol
We are using the mixed alkali method, which has better results and lower alkali consumption.
The sodium bicarbonate content of the DDS desulfurizer used in our factory is sometimes above 60. We considered mixing alkali to reduce the sodium bicarbonate content, but we also considered whether the reaction heat could be tolerated by aerobic bacteria. We consulted the manufacturer and concluded that the mixed alkali method for DDS desulfurization is not suitable as it will burn the bacteria. Other desulfurizers are said to be feasible in journals and websites published by Dongshi, and they also listed some successful manufacturers!
If you have any recommendations for this kind of information, I would be very grateful if you could upload them.
Thank you for participating in the discussion. :lol :handshake
Have you ever seen the composition analysis of desulfurization liquid? What are the main ingredients? It is NaHCO3 and a small amount of Na2CO3. In fact, there is the following acid-base balance in the solution: NaOHNa2CO3NaHCO3 After caustic soda is added as desulfurizer, it will only react with CO2 in the gas to generate NaHCO3. What changes is only the total alkalinity. The effect is the same as adding Na2CO3! Moreover, the price of caustic soda is many times that of soda ash! How much corrosion does it cause to the alkali dissolving tank! In fact, the way to reduce alkali consumption is to reduce the loss of solution, reduce the occurrence of side reactions, and do a good job in sulfur recovery!
After NAOH is added, NAHCO3 can be converted into NA2CO3. The theory is this. Our factory also has the problem of high NAHCO3. I am also seeking advice! ! :lol
Shift gas desulfurization is carried out when the partial pressure of CO2 is relatively high and the system pressure is much higher than that of semi-aqueous gas desulfurization. At this time, the solubility of CO2 in the solution is high, and a large part of the added NaOH will be converted into NaHCO3, so it can only be said that the total alkali can be increased, which has the same effect as adding Na2CO3, but the price of NAOH is much higher than that of Na2CO3.
Our plant's shift gas desulfurization completely uses sodium hydroxide (liquid alkali 30%). The equipment does not corrode, does not block the tower, and the operation is easy and controllable. Accessory salt (sodium thiosulfate + sodium sulfate does not exceed 50). It's just that the sodium bicarbonate is too high. The ratio to sodium carbonate is less than 10.