Control parameters for the outlet temperature of the methanol converter in coke oven gas-based production
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In fact, the temperature control parameters for the converter in each methanol plant that uses coke oven gas vary, mainly because the methane content in the coke oven gas differs from plant to plant. The conversion of methane vapor is an endothermic reaction; the higher the methane content, the more oxygen is required to supply sufficient heat, which results in higher reaction temperatures and outlet temperatures in the converter. Conversely, a low methane content results in a lower operating temperature of the converter. The ultimate temperature control of the converter is still determined by the methane content at the converter outlet. As long as the methane content at the outlet is less than 0.8%, an outlet temperature of over 800 degrees in the converter is sufficient; over 900 degrees is also acceptable, and in some cases a temperature of over 1000 degrees is even necessary.
We control the outlet temperature between 930-940 degrees, with the outlet methane level at 0.4-0.6 V%
Another factor is the catalyst usage time; the temperature at the outlet of the converter also increases as the catalyst is used for a longer period. Ultimately, the touch temperature increases as the methane content rises.
It depends on how long you have used the catalyst; we are now in the later stage of its usage. The temperature should be maintained between 960 and 970 degrees, with the methane content being around 1.0%.
There are issues with most of the temperature points; they are not the accurate temperatures of the bed layer, with the outlet temperature being around 950
The design values for the outlet temperature of the converter are generally between 960 and 980 degrees; under normal operating conditions, this is sufficient to meet the requirements regarding the methane content at the outlet. However, in some extreme cases, the outlet temperature is raised to the design value, resulting in an excess methane content at the outlet ； Generally, no company will operate beyond safe temperature limits just to reduce methane levels by a few tenths of a percent; safe production is far more important than producing a few extra tons of methanol.