Temperature during dry running of the reforming catalyst

The cooking temperature is actually the same for both black-braising and white-braising; then why did you use black-braising earlier? The burning temperature is mainly determined by the carbon content and oxygen content of the blackening agent; I think 533 is a bit low. You can try increasing the oxygen content and see what happens

This post was last edited and replied to by barton1995 on 2012-1-17 01:28. Reply to 2# hdlyzs: During the first operation of our new unit, the highest temperature during black combustion was around 566; a few days later, when we switched to white combustion, the highest temperature reached only around 535. The oxygen content is 0.6% during white firing and 0.84% during black firing

Is there something wrong with your oxygen meter? That high? It won’t work, right?

The oxygen content should be 0.6% and 0.84%; if it reaches 1.3%, the system will shut down automatically. The person who posted this said that the temperatures during normal operation and abnormal operation are lower, and I think this is due to differences in oxygen content control.

It is normal for the cooking temperature for white-braised dishes to be lower than that for black-braised dishes. The degree of charring temperature is functionally related to the oxygen content and the carbon content on the catalyst. During black burning, due to the high carbon content on the catalyst, the oxygen content is usually increased slightly to accelerate the coking process; as a result, the coking temperature rises accordingly.

Charring can be determined primarily based on the peak temperature and temperature distribution. When the oxygen content is increased, the temperature at the second or third point rises, but the temperature below it drops, as an increase in oxygen content accelerates the charring process; as a result, the charring rate and degree at the second point increase. However, the temperature of the air entering the regenerator, that is, the temperature after exiting the regenerator, remains basically unchanged. Therefore, the oxygen content can be used to control the peak temperature; however, a higher temperature has some impact on the catalyst’s lifespan. Wherever possible, the peak temperature should be reduced and the oxygen content lowered, while ensuring that the carbon is completely burned off, with the temperatures in points 4 to 8 remaining between 450 and 470.

Isn’t that normal? When burning in a black mode, the oxygen level is 0.84, while it’s 0.6 when burning in a white mode – there’s a difference of 0.24. Of course, the value is much higher in the black mode. As for the oxygen gauge, it’s like eyes – having a slight myopia or presbyopia isn’t a problem. In other words, some factories require a value of 0.5, some 0.8, and even some 1.0. In fact, if you use the same zirconia sensor, the reading might be 0.6 in all cases. There’s no need to worry; as long as the trend is correct, you can proceed with automation. If the carbon content of the catalyst is low, 533 degrees is definitely sufficient; it depends on the carbon content of the catalyst, the position of the peak temperature at which charring occurs, as well as the temperature distribution and the temperature in the chlorination zone.