84. What causes a high inlet temperature in the flue gas machine?

1) Abnormal operation of the regeneration system with excessively high temperature. 2) Poor burning in the regeneration system, resulting in afterburning of the regeneration flue gas.

I don’t know much about catalysis; that’s all I know.

Phenomenon: High temperature alarm at the smoke extractor inlet, slight smoking from the bearings. Cause: CO and flammable gases generated by incomplete combustion undergo secondary combustion or afterburning； There is a problem with the range hood cooling system ； The main air flow is too high ； Excessive char formation, excess heat

1) Alarm for high inlet temperature of the expander; 2) Smoke coming from the expander bearings; 3) Reddish color of the expander inlet pipe

Discussion and exchange: 1. The topic is \"the phenomenon of high inlet temperature in the flue gas extractor.\" First, it is necessary to define what is meant by \"high\" inlet temperature – whether it refers to a temperature that is higher than normal levels, or a temperature that exceeds the design limits. Since the subsequent content combines these two concepts, it is not possible to confirm or deny whether such descriptions are precise. Due to the lack of a precise definition for high temperatures, the following topics are discussed on the basis of overheating. 2. Temperature display can directly reflect the level of temperature, and it is the preferred method for determining whether there is overheating; when the temperature exceeds the allowable range, a temperature alarm may be triggered, or certain interlocked reactions may occur – these are all manifestations of such conditions. 3. Does the inlet temperature of the smoke extractor include both the internal temperature and the external temperature? If it includes the external temperature, smoking at the bearings of the smoke extractor can be attributed to an increase in temperature caused by bearing failure, which leads to their malfunction. However, if the bearing shell temperature is normal and the “smoking” is caused by a seal leak, it cannot be classified as a situation resulting from high inlet temperature of the smoke extractor. Additionally: The flue gas fan is of the cantilever type, with the bearing housing located on the outlet side of the fan; therefore, considering smoke coming from the fan’s bearings as an indication of high inlet temperature is questionable. 4. The temperature of the medium at the fan’s inlet is generally above 650°C, and even during the day the inlet pipes appear reddish; at night they appear almost blood-red. This high temperature persists until after the fan starts working, after which it drops. At such high temperatures, the pipes or the exterior of the fan are covered with insulating materials. It is understandable to consider the reddening of the smoke extractor inlet pipe as an indication of a high inlet temperature, but it is not appropriate to label it as a \"temperature excess\" that exceeds the allowable range. 5. When smoke gas overheats due to abnormalities in previous processes, other signs that appear include increased deformation of the duct at the inlet of the smoke exhaust fan, as well as a rise in the exhaust temperature of the fan. In extreme cases, the breakdown of the fan’s flywheel disc is also one of the indications of excessively high inlet temperatures. 6. Other responses in this discussion suggested possible “causes” for the overheating, which help to identify the relevant “phenomena” more accurately”