If the overhead gas from the methanol pre-tower is not burned in a flare, which facility is available to handle it? How was it handled?
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What should be done with the overhead vapor from the methanol pre-tower if it is not burned in a flare? Which households have treatment facilities in operation?
Recycling,. Using condensation adsorption for recovery may result in poor economic benefits
Firstly, the main component of the non-condensable gas in the distillation pre-column is carbon dioxide; the remaining components include dimethyl ether, amines, etc., all of which have very poor flammability； Secondly, the pressure in the pre-tower is very low, and it is also impossible to access some of the plant’s systems (such as the gas pipeline network). On our end, we produce methanol from natural gas, and carbon needs to be added to the system; therefore, the non-condensable gases from the pre-tower are introduced into the gas holder.
It is possible to consider sending the combustible gas to a TO furnace for combustion after pressurization by a fan, or to treat it together with the exhaust gases from low-temperature methanol washing
The exhaust gas from low-temperature methanol washing can meet the standards after being washed with water, but the exhaust gas from the pre-tower cannot
One could consider adding it to the feed gas as mentioned above, checking that the pressure and gas composition meet the requirements for the feed gas. However, during emergency response, more consideration should be given to the mutual influence between adjacent work sections