What causes the sudden rise in the temperature of the methanol catalyst layer?

CO disproportionation and CO methanation reactions may occur. . . .

A dry drum condition in the steam drum occurs, or the gas composition changes suddenly, leaving no time for the pressure in the steam drum to drop!

Answer: The increase in the temperature of the catalyst layer in the synthesis tower can be attributed to several factors: (1) A high pressure in the steam drum or an excessive amount of fresh gas can cause the temperature of the catalyst layer to rise. Solution: Reduce the drum pressure, or decrease the amount of fresh gas, or increase the amount of recycled gas. (2) A decrease in the circulation rate will cause the tower temperature to rise. Solution: Reduce or close the bypass valve of the synthesis tower system to increase the amount of recycle gas entering the tower. If an increase in tower temperature is caused by a tripping of the circulator, an emergency shutdown should be carried out; operation can resume only after the circulator is back to normal operation. (3) Changes in gas composition, such as a decrease in CH4 in the feed gas accompanied by an increase in the effective gases for methanol synthesis, will cause the tower temperature to rise. Handling method: Notify the gas generation team to adjust the composition of the fresh gas. (4) Defects in the internal components of the synthesis tower, such as leakage at the outlet, can cause some of the gas entering the tower to pass directly into the outlet pipeline without undergoing reaction in the catalyst layer, which in turn leads to an increase in the temperature of the catalyst in the synthesis tower. If the defect is minor, production continues; in severe cases, the plant must be shut down for maintenance. (5) In addition to the reasons mentioned above, it is also necessary to check whether the temperature rise is caused by a malfunctioning instrument; in such cases, the operator should analyze various factors to determine whether everything is normal, and should ask an instrument technician to inspect and repair it.

Bro, you’re really a legend. Can you tell me how to increase methane levels? It’s easy for us to use methane as natural gas and then convert it into methanol

1. Air velocity: The air velocity has decreased, or the compressor has tripped. 2、. . . Severe imbalance in the hydrogen-to-carbon ratio (increased carbon monoxide, reduced or even absent carbon dioxide). 3. The boiler water pump in forced circulation fails to operate or operates at a low capacity (blockages in the downcomers due to natural siphonic convection, etc.). . ) 4. Uncontrolled drum pressure and low liquid level. 5. In the case of air-cooled towers, it may be due to insufficient amount of cooling air or blocked cooling air lines. 6. Instrumentation problems. 7. Another factor is an increase in inlet temperature; since this is a sudden change, the inert components cannot change suddenly either, so it’s not worth mentioning. If it stops working while parked, then there are only two possibilities: a faulty gauge or negative pressure causing oxygen to enter the system

In addition to the reasons mentioned by the previous poster, a high content of fresh gas also cannot rule out this possibility; furthermore, an increase in the pressure of the gas pocket will also lead to an increase in the temperature of the process gas at the outlet of the synthesis tower.

During the steam conversion of coke oven gas, if the conversion efficiency is low, CH4 levels will be high.