Methods for controlling furnace temperature?

Is it an automatic control system? ? In relatively stable systems, this can be achieved by tuning the control system. For complex systems, scholars specializing in control attempt to achieve it through networked control – but this has not yet been realized! ! :lol Last edited by Spotted Cat on 2008-11-17 20:40 ]

What low-variation systems fear is overheating; then why raise the temperature? Check the inlet temperature and CO content.

With a low variation inlet of 220, the hotspot can be maintained at 260; otherwise, it cannot be sustained. By the way, the import rate for CO is around 13%.

1. Is the outlet temperature of the medium-temperature shift normal? It’s normal; it could be an internal leak in the heat exchanger at the low-temperature inlet. 2. Is the temperature control valve the cold bypass? It’s possible that the valve core has fallen off, or there is a fault with the instrument. 3. Is it a current-resistant converter? If so, it might be due to too much process steam causing catalyst reverse sulfidation, or it could be overheating that leads to catalyst reverse sulfidation.

Key points for controlling the temperature in a medium-pressure shift converter: 1. The carbon monoxide content in semi-water gas; 2. The inlet temperature of the medium-pressure shift converter; 3. The outlet temperature of the medium-pressure shift converter, which is affected by heat exchange with the inlet; 4. The outlet temperature of the saturation tower, which can be increased to raise the inlet temperature. 5. Adjustment of steam addition amount. 6. Catalyst performance: it has high activity at the beginning, making adjustments easy; adjustments become difficult in the later stages, but stability is maintained. The temperature of the low-temperature reformer is affected by the outlet temperature of the medium-temperature reformer and the carbon monoxide content, and the temperature changes caused by the medium-temperature reformer can be controlled.

If J is at a medium value, then CO is converted to a large extent; with a low value of J, there are fewer gas reactions, so the furnace temperature drops, right?

I only know that the lower the shift temperature, the lower the equilibrium CO concentration at the outlet; higher temperatures are not favorable for the shift reaction. Could it be that the temperature is below 180 degrees? In our factory, we raise the inlet temperature to stabilize the bed temperature. Moreover, it has a large margin for adjustment. Adjusting bed temperature: One method is to adjust the concentration of inlet CO. Increasing the concentration will definitely raise the bed temperature. The second is to adjust the inlet temperature. This should be easy to adjust.

Let’s mention the inlet temperature; we use a steam heater to raise it

I guess the common temperature adjustment methods must have been used by the original poster, right? For example, increasing the intermediate outlet temperature, adjusting the bypass line, and so on. It seems necessary to carry out sulfurization again for the low-voltage version; otherwise, it might be better to replace the catalyst.

The inability to increase the furnace temperature may be caused by a decrease in catalyst activity over time! It could also be due to an insufficient water vapor ratio. The poster can reduce the pressure difference between the upstream and downstream sections in order to lower the gas flow rate, thereby increasing the reaction time of the catalyst and allowing it to react fully so as to release reaction heat and raise the furnace temperature! However, based on what the original poster said, increasing the water vapor ratio can reduce the amount of carbon monoxide at the outlet, which indicates that the problem is likely caused by an insufficient water vapor ratio. Increasing the water vapor ratio is indeed a good solution! ! The effect of reducing the voltage difference may not be very significant!