Temperature control of methanol converter feed into the converter.
Thread Content
While checking the PID values, I noticed that there is a temperature sensor before the gas generation conversion reaction takes place in the radiant section of the converter, where the process gas for methanol production is sent. I would like to ask fellow experts: what effects can high temperatures in the converter have? The conversion reaction is an endothermic reaction; I think high temperatures are favorable for the reaction, but why is it necessary to control the temperature so that it doesn’t exceed a certain range? This section is heated by the preheating coil in the convection section of the converter; even if the temperature is a bit high, it certainly won’t be extremely high.
Is it the heating coil of the heating furnace or preheating furnace? Converting furnaces don’t have a radiation zone or a convection zone. :D: If it refers to the outlet temperature of the heating furnace, keeping it between 550-500 is sufficient; too high a temperature will reduce the lifespan of the heating furnace. When the temperature is too low, it is easy for the gas to go out in the second-stage furnace”
It refers to a mixing raw material heater at the furnace inlet, whose outlet process gas temperature is generally controlled at 550 degrees. If the temperature is too high, it is certainly favorable for the reaction, but this is limited by the material of the inlet header.
If the poster is referring to the temperature of a box furnace, then as long as the material allows it, a higher temperature is beneficial for the reaction.
Within a certain range, increasing the temperature helps facilitate the conversion reaction; however, excessively high temperatures have severe effects on both the catalyst and the furnace. Temperature control in the converter is extremely important
The temperature control in a converter is extremely strict; high temperatures are detrimental to the lifespan of the catalyst. The faster the temperature rises, the shorter the catalyst’s lifespan. Since the conversion temperature is influenced by the material of the conversion tubes, the exit temperature in the radiation section must not exceed 830 degrees. If the temperature of the steam-mixed gas preheater is too high, it indicates that the negative pressure in the furnace is too high, which will result in an increased consumption of fuel gas
I’m not sure where the claim that your outlet temperature cannot exceed 830 degrees comes from; our outlet temperature is 889 degrees
The exit temperature of the first stage furnace varies from one plant to another; in some plants, there is no second stage furnace, so the exit temperature of the first stage furnace is higher
It affects the catalyst’s activity and reduces its service life. :D :D
:L :L :L It seems you mentioned the inlet temperature first, but then you talked about the outlet temperature. There are limitations to any temperature control; it doesn’t make much sense to say that the higher or lower the temperature, the better. Generally speaking, each company has its own production process specifications, and when establishing these specifications, safety in production must be taken into account (what about the impact on the lifespan of the conversion tubes and CATs?) ), the economic aspects of production (raising the temperature to certain levels increases costs, while the increase in conversion rate is minimal. There’s also the process itself: if a two-stage furnace is used, a single-stage furnace does not require such high temperatures; maximizing the utilization of oxygen is the key strategy), as well as the convenience in controlling the production process. The conversion reaction is an endothermic reaction; increasing the reaction temperature is certainly beneficial for the reaction itself, but raising the temperature requires taking the above three factors into consideration.