Can’t keep the conversion temperature?
Thread Content
The temperature on the first and fourth floors of the converter cannot be maintained. Can you start the analysis from the auxiliary line valve and catalyst?
This depends on the flue gas concentration, heat transfer performance of the heat exchanger, conversion and insulation, etc. Is the conversion one-to-one? Or "3+1" double rotation and double suction?
Analysis from heat exchanger area and gas concentration.
It is normal for the temperature to be unable to be maintained in the four stages of conversion, but it is a bit abnormal if the temperature of one stage is not maintained. If the temperature of one stage is not maintained, even if the temperatures of the following stages are normal, the total conversion rate will be low to a certain extent, and even as time is delayed, the entire conversion temperature will cross the stage. Four sections can be analyzed from the secondary line first, but one section is generally not analyzed from the secondary line first. There are many reasons why the temperature cannot be maintained for a period of time.: Low sulfur dioxide concentration, excessive opening of the auxiliary line valve, damaged catalyst, etc. The main reasons are personally believed to be caused by low sulfur dioxide concentration.
The amount of information provided by the poster is too small for further analysis.
Acid production from zinc concentrate, a 60,000-ton unit, the reaction in one stage is insufficient and the outlet temperature is low. During the overhaul, the catalyst replenishment amount is too small, and there seems to be a problem with the reactivity. The electric furnace is often started and stopped, making the temperature of each section unstable. Suggestion: Always open one section of the electric furnace, do not turn it on and off; use the auxiliary line to raise the inlet temperature of the second section to stably convert the temperature of each section. Measure the conversion rate of each section under stable conditions. When there is a long shutdown time, the roasting and dust collection equipment is sealed, the intercooler is thrown away, and the negative pressure is reduced, in order to increase the gas concentration. After a period of time, the catalyst is replenished.
Check from several aspects: 1. SO2 concentration. 2. Whether the instrument is normal. 3. Whether the insulation layer meets the requirements. 4. Whether the secondary line valve is opened too large. 5. Whether the activity of the catalyst has decreased. 6. Whether the area of the heat exchanger is too small or the heat exchange effect is poor. I think 1 and 2 are more likely.