Selection of steam for desulfurization regeneration of N-methyldiethanolamine
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In conventional catalytic cracking, when using a desulfurizer to remove hydrogen sulfide and regenerate it, should N-methyldiethanolamine desulfurization regeneration steam be 1.0 pressure steam or steam that has been cooled and depressurized? We are equipped with a temperature and pressure reduction system, but there is disagreement regarding whether to activate it or not. Dear sea friends, please help analyze the pros and cons.
Cool and depressurize using 0.4 MPa steam or 1.0 MPa steam.
Depending on the temperature at the bottom of the regeneration tower, steam at 0.4 MPa or 1.0 MPa is used for temperature and pressure reduction.
Just reduce the temperature and pressure to 1.0; there’s a significant difference in cost per ton. Nowadays, combined heat generation is used, and replacing steam with oil slurry can result in considerable savings in energy consumption.
The design includes a temperature and pressure reduction system, but I would like to ask why steam that has been reduced in temperature and pressure is necessary
What’s the deal with using slurry instead of steam?
Many devices these days use steam at pressures below 0.5 Mpa; it’s not necessary to use steam that has been cooled to 1.0 Mpa. The thermal decomposition temperature of the desulfurization agent used in our company is around 245 degrees, so the steam temperature used as the heat source at the bottom of the tower does not exceed this value
Originally, this temperature requirement applied to monoethanolamine (MEA), as there was a concern that high local temperatures in the heat exchanger could cause its degradation. Now N-methyldiethanolamine is used; the temperature at which it degrades is unknown, but the requirements of reducing temperature and pressure still apply.