Methanol Weekly Topic: Is it feasible to increase production by raising the compressor circulation rate? 2015.09.13--09.19
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Is it feasible to increase production by raising the compressor circulation volume? It doesn’t seem very logical – increasing the circulation rate can only improve purity.
Values within the design range are fine.
Not feasible! ! ! ! ! ! ! ! ! ! ! ! ! !
Increasing the compressor circulation rate to boost production is not feasible
In the early stage of the catalyst’s life, it works well; increasing the circulation rate means reducing the amount of slip or increasing the compressor speed (which also raises the space velocity). When the catalyst is active at this initial stage, it facilitates the reaction process. However, later on the catalyst becomes less useful and even reduces production, as an increased circulation rate leads to more inert components entering the system, and a high space velocity does not facilitate the residence time of the feed gas on the catalyst； A higher reaction temperature at the end stage is beneficial for synthesis; increasing the space velocity, on the other hand, tends to carry away heat, preventing the bed temperature from being maintained. Actually, the best approach is to adjust the components; with appropriate components, as well as suitable temperature and pressure, production will increase while consumption per unit will decrease.
Not being able to finish eating at the end is a tactic. Generally, the factors that determine yield are the volume of fresh gas, the reaction temperature range, the amount of catalyst, and the water cooling temperature; the alcohol content after separation is even more critical
Not being able to finish eating at the end is a tactic. Generally, the factors that determine yield are the volume of fresh gas, the reaction temperature range, the amount of catalyst, and the water cooling temperature; the alcohol content after separation is even more critical
If the original air velocity is at the lower limit, it can be determined based on the one-way conversion rate, bed temperature, compressor steam consumption, and the opening degree of the GV valve
Increasing the circulation rate has little effect on increasing production； But it is beneficial for the use of catalysts
In production, attempts were also made to increase the circulation rate in order to boost yield, but aside from an increase in the resistance of the synthesis tower, there was hardly any significant change in yield.