A problem with transformation
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When the conversion rate of CO is not high during methanol production, it is possible to first cool the gas to remove dust from it. At the same time, a waste heat boiler for water-gas systems can be used to control the moisture content in the water-gas mixture, thereby also regulating the conversion rate of CO. As for how low the temperature of the gas can be reduced, what does it mean to use a waste heat boiler to control the moisture content?
Control the saturation of water vapor in gas by the pressure in the waste boiler； One waste boiler pressure corresponds to one waste boiler steam temperature, and one waste boiler steam temperature corresponds to one gas temperature; therefore, at that gas temperature, the water vapor content in the gas is fixed! The exact temperature to which cooling is required depends on the transformation effect and the needs of the transformation process; there is no fixed value. This temperature varies depending on the stage of the catalyst
I have a rather unprofessional question: after washing and cooling, assuming that there is no water left in the cooled gas and the temperature is 40 degrees, can it be fed directly into the converter?
No, there is no reaction without water vapor being carried along; furthermore, if the temperature is too low, below the activation temperature of the conversion catalyst, no reaction can occur either.
There are several types of shift processes, and water can also be added separately. The key issue is that the activation temperature for the shift catalyst is above 200 degrees; at such a low temperature, heat exchange must occur at the entrance to the shift reactor, which results in high energy consumption, and it’s also very difficult to design heat exchangers for this purpose
I’ve answered your question together! The maximum temperature of the outlet gas is also determined by the catalyst. Currently, catalysts with a low water vapor ratio produced by Qingdao Lianxin are being used quite frequently; they require a water vapor ratio of around 0.25–0.31. You can use this to calculate the maximum possible temperature of the outlet gas
Weren’t the catalysts previously heated to around 300 degrees, waiting for the gas to enter? A low gas temperature simply lowers the temperature of the catalyst
Judging from the operating temperature, a slightly higher bed height is only beneficial for starting up the operation