The issue of secondary condensation in pre-towers: views on the five-in-one mixed cooler
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Our company’s plant for producing methanol from coke oven gas, with an annual capacity of 100,000 tons, was designed by the Second Research Institute; it does not have a separate secondary heat exchanger. It is cooled together with pure methanol, as well as fusel oils and the bottom water from the atmospheric pressure tower. A wet evaporative cooler is used, with the fan speed controlled via frequency conversion to address control issues; however, it is required that the concentration of pure methanol remain at 40, so how should the temperature of the secondary condensation be controlled? I think the direction of the fan’s impeller can be controlled.
Ours is also a 5-in-1 cooler; since it’s necessary to control the temperature of the non-condensable gas in the pre-tower, I’m not sure whether the other temperatures can be controlled well. Our device hasn’t been turned on yet. I would also like to ask the experts here.