Firstly, it is required that the steam pressure, flow rate, etc. required for heating the molecular sieve meet the requirements of the process design.
The heating regeneration process can be judged by the regeneration temperature curve. During the pressure relief stage, due to the decrease in pressure, the adsorption capacity of the molecular sieve decreases, and some of the previously adsorbed water and carbon dioxide molecules are desorbed, resulting in a decrease in temperature.
During the heating stage, the inlet temperature of the dirty nitrogen gas rapidly increases, but the outlet temperature will continue to decrease at the beginning and then gradually increase. Because the heat at this time is first consumed in the heat required for desorption, the upper and middle molecular sieves of the bed are desorbed, and the heat is stored in the bed. The factors that affect the regeneration effect during this stage are: nitrogen flow rate, heating time, and regeneration temperature. Mainly monitoring the inlet temperature of sewage nitrogen.
During the cold blowing stage, the outlet temperature of the polluted nitrogen will continue to rise. At the beginning of this stage, the heat stored in the molecular sieve bed is used to continue desorption of the lower molecular sieve until the highest proportion of the cold blowing curve - the "cold blowing peak" - is reached. This temperature is a sign of whether the entire bed regeneration is complete. Because it is least likely to regenerate completely at the outlet. If the temperature at that location can meet the requirements, the internal temperature must definitely exceed this temperature, indicating that the internal regeneration has been completed. Therefore, during the cold blowing stage, the main focus is to monitor the peak temperature at the outlet.
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