How to control the outlet temperature of the converter
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How to control the outlet temperature of the converter
I used to work with a process that involved a tar heating furnace, where gas was burned for heating; it seemed to use cascade control. It’s been over 10 years now and I’ve forgotten the details
At a constant air velocity, it is primarily controlled by regulating the inlet temperature
The outlet temperature is generally the temperature reached due to the heat released by the catalytic reaction; the inlet temperature must not be lower than the catalyst’s active temperature, and the outlet temperature is hardly adjustable.
First, it is necessary to determine which type of shift process your company is using: full shift (such as processes for hydrogen production and ammonia synthesis, where an outlet CO level of <0.5% is generally required), partial shift (for methanol, ethylene glycol, acetic acid, olefins, and batch coal-to-oil processes), or the emerging isothermal shift process. The temperature control methods vary depending on the process: inlet temperature, water-to-gas ratio (water-to-carbon ratio), space velocity, composition of the inlet feed gas, pressure in the gas holder (isothermal shift), amount of catalyst used, as well as the radius-to-height ratio of the shift reactor and the active composition of the catalyst (cobalt-molybdenum series, iron series) – all of these factors affect the outlet temperature.
Control adjustments are made according to the conditions of the transformation process; normally, it is the inlet temperature and the water vapor ratio that are adjusted.