(Daily Question) Coal-to-oil and olefins forum, 1.3.2018
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3.jpg Participation: Prize of 5 Wealth； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Question: What is the purpose of cold blowing in the dryer of the (DMTO) olefin separation unit? The purpose of cold blowing is to remove heavier hydrocarbons with a molecular weight of four carbon atoms or more before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing a cold blow, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and thus reducing its service life as well as the dryer’s processing capacity! Note: The answers will be released automatically in two days!
The purpose of cold blowing is to remove heavier hydrocarbons above C4 before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing a cold blow, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and thus reducing its service life as well as the dryer’s processing capacity
The purpose of cold blowing is to remove heavier hydrocarbons above C4 before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing a cold blow, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and thus reducing its service life as well as the dryer’s processing capacity
The purpose of cold blowing is to remove heavier hydrocarbons above C4 before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing a cold blow, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and thus reducing its service life as well as the dryer’s processing capacity
The purpose of cold blowing is to remove heavier hydrocarbons above C4 before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing cold blowing, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and reducing its service life as well as the dryer’s processing capacity.
The purpose of cold blowing is to remove heavier hydrocarbons above C4 before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing a cold blow, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and thus reducing its service life as well as the dryer’s processing capacity
The purpose of cold blowing is to remove heavier hydrocarbons above C4 before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing a cold blow, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and thus reducing its service life as well as the dryer’s processing capacity
Vaporization and desorption of liquid on the surface of dry gas
The purpose of cold blowing is to remove heavier hydrocarbons above C4 before heating the bed. When the dryer is operating normally, some unsaturated hydrocarbons get adsorbed on the surface of the molecular sieve. If the temperature is increased without first performing a cold blow, the unsaturated hydrocarbons in the heavier components will coking, blocking the channels in the molecular sieve and thus reducing its service life as well as the dryer’s processing capacity
Displace the residual process gas in the dryer
Given the working principle of molecular sieves, it is known that adsorption occurs more effectively at low temperatures, while regeneration is more effective at high temperatures. Therefore, molecular sieves generally operate at low temperatures and are regenerated at high temperatures. Therefore, when heating regeneration is completed, the molecular sieve needs some time to be cooled by gas at a lower temperature; this is known as cold blowing. The function of cold blowing is to lower the temperature of the regenerated molecular sieve to that of the other active molecular sieve, after which the switch is made. In this way, the system remains relatively stable and free from fluctuations.