Discussion on the fact that the outlet temperature of the methanol synthesis tower is not controlled by the drum pressure
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Discussion on the fact that the outlet temperature of the methanol synthesis tower is not controlled by the drum pressure. Typically, the outlet temperature of the methanol synthesis tower is controlled by the drum pressure, with the temperature rising by 1.35–1.5°C for each increase in pressure. Have you ever seen a situation where the outlet temperature of a methanol synthesis tower is not controlled by the pressure in the drum?
I have seen phenomena that are not controlled by the drum pressure. In a 200,000-ton methanol plant, after the heating and reduction process was completed, the temperature at the tower outlet increased from 222°C to 251°C over a period of 7 months; the pressure in the drum remained at 2.15 MPa, and the drum functioned as a vapor receiver.
The drum pressure remains at 2.15 MPa
This post was last edited by he*aoyu8911 on 2017-7-21 06:50. The issue arises because the heat exchanger is unable to remove the reaction heat in a timely manner, or the reaction heat cannot be transferred promptly to the boiler feedwater on the reactor shell side. This problem stems from two factors: excessive reaction heat and poor heat exchange efficiency (such as carbon deposition, catalyst short circuits or bridging, and an excessively low hydrogen-to-carbon ratio). The pressure gauge is inaccurate, and the process gas stays in the reactor for too short a time to allow for heat exchange (but it seems that there’s not enough time even for a reaction to take place either~~). ）
The catalyst loading is only 18 cubic meters, resulting in a high production intensity.
This is a 200,000-ton methanol project; the catalyst volume required is only 18 cubic meters, resulting in a high production intensity.
After the hydrogen-to-carbon ratio becomes unbalanced, the drum pressure and outlet temperature do not match
Come in and take a look; I’ve gained more experience again
Agree with the view from Floor 4: 1. There are issues with the instruments. 2. The volume of circulating gas is too high; as a result, heat cannot be transferred to the water and is carried away by the gas. 3. Only 18 cubic meters have been installed, and it’s not clear whether the catalyst is equipped with an insulating layer. If not, it will cause the temperature at the upper part of the synthesis tower to be low while the temperature at the lower part is high, resulting in a large temperature difference within the bed layer and a decrease in heat transfer efficiency.
This post was last edited by baisha123 on 2017-8-10 14:19. Let’s share it! With the use of a catalyst, its hot spot temperature decreases; the resulting phenomenon is that the temperature of the water bath remains unchanged while the outlet temperature rises. Therefore, to determine the catalyst activity, one needs to look at the difference between the water bath temperature and the outlet temperature. -----Tower type without hotspot temperature