Transformation preheating furnace tube
Thread Content
What are the on-site and control-room indications of tube leakage in the preheater of the methanol conversion unit? What should be done if there is a leak in the furnace tubes of a preheating furnace?
I’m not sure what type of preheating furnace you have – is it a box-type furnace or a coiled cylindrical furnace? Actually, there is a relatively simple method to test whether the furnace tubes are leaking: reduce the amount of fuel gas and see if there are any significant changes in the temperatures in different areas of the furnace Can it also be checked through the observation hole? The only solution is to use the parking opportunity to carry out patch welding
Generally, it is sufficient to stop the vehicle immediately upon discovery. The control system can detect that there is a significant difference between the pressure entering the preheating furnace and the pressure exiting it. The most important one.
The interlock based on the difference in gas flow rates at the inlet and outlet of our heating furnace isn’t in use, as the two flow meters are inaccurate – the difference between their readings is over 10%. This is also a potential hazard! ! ! ! 3# Full of excuses
The preheating furnace in our factory is of the coil type; this situation is relatively rare, I guess. I’m a beginner and don’t know how to detect such a problem, so I’m asking for advice from everyone here!
Another point is how to detect the aforementioned situations during normal production!
The preheating furnace coil in our plant is also leaking, which can be easily seen through the observation hole.
If the preheating furnace tube breaks and leaks, the system pressure will drop; as a result, the temperature in the preheating furnace’s furnace chamber will rise, along with the temperature of the catalyst bed in the conversion furnace. In such a situation, an emergency shutdown is necessary. The system temperature must be reduced to below 500 degrees, by using nitrogen for cooling and by venting steam; the system should also be kept at a slight positive pressure. The burners in the preheating furnace should be turned off, and blowers should be used to cool the preheating furnace until it reaches normal temperature. Once the analysis shows that everything is satisfactory, the furnace can be taken apart for maintenance
The main parameters observed are temperature, pressure, flow rate, and changes in temperature. It can be seen from the negative pressure.
We have box-type furnaces here, and no leaks have been detected for now. However, it is necessary to monitor temperature changes regularly, as well as changes in fuel flow