Why is the water vapor content lower, and why does the furnace temperature rise when that changes?
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Our factory uses medium-low-low conversion. My master said that when the water vapor ratio is low, the furnace temperature rises. I’ve thought about it for a long time but don’t understand why; he too can’t explain it. So I’m seeking advice from all of you here
When the water vapor ratio is low, the heat released by the reaction between CO and H2O is greater than the heat carried away by the additional gases (the excess water vapor produced by the reaction and the gases formed as a result of it), so the temperature of the converter bed increases.
Reply 1# *aomomo: When the water vapor ratio is low, the reaction occurs almost completely; in other words, there is no water vapor left. Since water has a high heat capacity, there is nothing to absorb the heat generated by the reaction. It all shows up in an increase in furnace temperature!
This post was last edited by HZG on 2010-11-2 at 12:52. Generally, the higher the water vapor ratio, the more intense the reaction and the greater the heat generated. As a result, the temperature of the shift reactor bed rises. However, when the water vapor ratio exceeds a certain value (usually above 0.8), further increases in the water vapor ratio lead to only a small increase in the heat generated by the reaction. At the same time, the amount of steam increases, meaning the volume of gas entering the reactor also increases. The heat generated by the reaction is less than the amount of heat carried away by the excess steam, so the temperature of the shift reactor bed decreases. Conversely, the temperature rises.
Reply to 4# HZG: According to what you say, when changing modes of operation, should the gas/steam ratio be adjusted to above 0.8 as soon as possible? To prevent overheating from occurring
Reply 1# *aomomo The change is a reversible reaction; once the water vapor ratio is not properly controlled, it means that the exothermic reaction intensifies, resulting in an increase in temperature.
The explanation on the 4th floor is quite clear; this is the situation for medium voltage.