What are high-, medium-, and low-temperature shift reactions, and where are their boundary points?
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What are high-, medium-, and low-temperature shift reactions, and where are their boundary points?
High-temperature shift: 330 ℃ ~ 430 ℃; Medium-temperature shift: 210 ℃ ~ 330 ℃; Low-temperature shift: 190 ℃ ~ 210 ℃
Now there are only the terms high-temperature conversion and low-temperature conversion. Medium-temperature shift is the term we use; internationally it is referred to as high-temperature shift.
High temperature. Medium temperature. Low-temperature conversion is mainly due to differences in the catalysts
We have 3 furnaces here: one for high temperatures and two for low temperatures. But the temperature on the 2nd floor is really low
In my opinion, the difference in low-temperature conversion at the high school level is not due to different catalysts, but rather to different pressure levels. Because at different pressure levels, water vapor has different condensation points – for example, 232 degrees at 40 kilograms and 180 degrees at 10 kilograms. Since the catalyst requires that water vapor not condense, in conversion reactions, higher pressure levels necessitate higher temperatures, while lower pressure levels allow for lower temperatures. The pressure level is related to the required reaction space velocity, and thus is also associated with the production capacity. Therefore, manufacturers will choose different conversion processes based on their production capacity and the type of coal available.
This explanation doesn’t seem right; please, experts, give me some guidance!
Reply to 1# wlq1970: The classification into high, medium, and low pressure is indeed based on the catalysts that are most commonly used, as choosing different catalysts results in different reaction temperatures.
Reply to 7# apple2008: Our factory uses two-high voltage transformers converted to two-low voltage transformers, so there is no such thing as different pressure levels; this view is definitely incorrect.