The outlet temperature at the first stage of the sulfur-based acid production converter will not rise
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The exit temperature at the first stage of the two-stage, two-absorption converter for sulfur-based acid production will not rise, while the inlet temperatures at the third and fourth stages are basically normal. How can the exit temperature of a stage be increased without raising the inlet temperature of that same stage?
This post was last edited by ValveMingming on 2016-11-19 at 09:08. @ErMuGe @DanZhi, I’ll find @OneLeafClearTea for you
What is the SO2 concentration entering the converter? What is the inlet temperature?
It’s necessary to examine the process flow in detail to understand it clearly!
This post was last edited by Danzhi on 2016-11-19 at 21:52. @Yuan Hongfenghou: What readings do the temperature sensors on the exhaust gas duct at the first floor show? One can try increasing the airflow of the air fan (i.e., reducing the concentration of SO2 entering the converter) and observe the change in the temperature rise at that layer. It is estimated that an S-series catalyst is being used; the activity in the lower part of Layer 1 declines relatively rapidly at high temperatures. The catalyst in Layer 1 can be adjusted during the next maintenance period (for example, by using a catalyst with better thermal stability in the lower part of Layer 1).
You can also try optimizing the temperature for one layer
It’s probably a problem with the catalyst and the conversion rate.
What is the gas concentration at a certain inlet temperature? Calculate the segmented conversion rate; without any reaction, there can be no heat (check if the temperature probe is damaged)
Factors affecting the outlet temperature of a section: gas concentration, air volume, furnace temperature (refer to the outlet of the sulfur combustion furnace), instrument accuracy, location of the temperature measurement point, and catalyst activity. Check each one by yourself.
Many users use the catalysts with the greatest price advantage on the market, especially when the activity at the bottom of the first conversion layer declines rapidly. For the production of acid from pyrite and smelting flue gas, electric furnaces for the next conversion are sometimes even put into use at higher concentrations; this is because the inlet temperature of SO3 in stage I decreases, resulting in a reduction in the heat transfer rate in stage I, and consequently the inlet temperature for the first stage of conversion also drops.
Buying high-quality catalysts at low prices goes against market principles; it’s inevitable to pay a price for that.