Methanol washing
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Why can the temperature keep dropping only after methanol washing of the gas?
What is the main function of the balance pipe at the bottom of the methanol wash heat regeneration tower?
It’s just a connecting function………………
Because low temperatures cannot be achieved solely through ammonia cooling; it is only through the desorption of CO2 after gas introduction that low temperatures can be obtained
Relying solely on ammonia cooling to temperatures below -20°C is not sufficient; only by passing gas through CO2 for separation can temperatures below -36°C be achieved
The dissolution of CO2 in methanol is an exothermic process, while its separation from methanol is endothermic. The methanol containing dissolved CO2 is cooled to -32 degrees using an ammonia cooler, and then CO2 is separated from the methanol through nitrogen stripping, which further lowers the temperature to around -60 degrees. Only after gas introduction can CO2 dissolve into methanol; therefore, only then can the temperature of methanol continue to drop. The direct source of cooling capacity is the cooling energy released as CO2 dissociates from the methanol solution, but the ultimate source remains the cooling energy provided by the ammonia cooler.
The function of connectivity is to ensure that the liquid levels in the left and right chambers of the thermal regeneration tower are equal. . . .
7# haorui0911: The cooling capacity for low-temperature methanol washing comes from two sources; one is provided by the ammonia system, and the other is the cooling energy released during the carbon dioxide separation process.
Cold source: liquid ammonia, gas stripping, syngas washed with liquid nitrogen
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Because after absorbing carbon dioxide, methanol is separated in an ammonia cooler, allowing its temperature to be reduced significantly. Furthermore, since the amount of methanol in the system remains constant, as gas is introduced the saturation of carbon dioxide in the methanol increases; as a result, more carbon dioxide is extracted from each unit area of methanol, and the temperature continues to drop.