Purification Technology Edition: Daily Question [2017-11-13]
Thread Content
Why is the temperature at the top of the scrubber lower as the methanol circulation rate decreases? Answer: When the system load remains constant, the amount of cooling capacity available to the system is essentially fixed. If the methanol circulation rate is high, less cooling is obtained per unit volume of methanol, resulting in a higher temperature. Furthermore, with a large methanol circulation volume, the temperature difference in the heat exchanger leads to increased cooling loss. Therefore, by using a smaller methanol circulation volume, more cooling can be obtained per unit volume of methanol, and the cooling loss is reduced as well; as a result, the temperature of the methanol flowing to the top of the washing tower is lowered.
When the load on the system remains constant, the amount of cooling capacity available to the system is essentially fixed. If the flow rate of methanol is high, less cooling is obtained per unit volume of methanol, and as a result the temperature rises. Furthermore, due to the large circulation volume of methanol and the temperature difference in the heat exchangers, heat loss increases. Therefore, when the circulation volume of methanol is low, more cooling can be obtained per unit volume of methanol, with less loss as well; as a result, the temperature of the methanol entering the top of the methanol washing tower is reduced.
When the system load remains constant, the amount of cooling capacity available to the system is essentially fixed; if the volume of methanol in circulation is large, less cooling is obtained per unit volume of methanol, and thus the temperature rises. Furthermore, with a large methanol circulation volume, the temperature difference in the heat exchanger leads to increased cooling loss. Therefore, by using a smaller methanol circulation volume, more cooling can be obtained per unit volume of methanol, and the cooling loss is reduced as well; as a result, the temperature of the methanol flowing to the top of the washing tower is lowered.
When the system load remains constant, the amount of cooling capacity available to the system is essentially fixed; if the volume of methanol in circulation is large, less cooling is obtained per unit volume of methanol, and thus the temperature rises. Furthermore, with a large methanol circulation volume, the temperature difference in the heat exchanger leads to increased cooling loss. Therefore, by using a smaller methanol circulation volume, more cooling can be obtained per unit volume of methanol, and the cooling loss is reduced as well; as a result, the temperature of the methanol flowing to the top of the washing tower is lowered.
When the system load remains constant, the amount of cooling capacity available to the system is essentially fixed; if the volume of methanol in circulation is large, less cooling is obtained per unit volume of methanol, and thus the temperature rises. Furthermore, with a large methanol circulation volume, the temperature difference in the heat exchangers leads to increased cooling loss. Therefore, by using a smaller methanol circulation volume, more cooling can be obtained per unit volume of methanol, and the cooling loss is reduced as well; as a result, the temperature of the methanol flowing to the top of the wash tower is lowered
When the system load remains constant, the amount of cooling capacity available to the system is essentially fixed; if the volume of methanol in circulation is large, less cooling is obtained per unit volume of methanol, and thus the temperature rises. Furthermore, with a large methanol circulation volume, the temperature difference in the heat exchanger leads to increased cooling loss. Therefore, by using a smaller methanol circulation volume, more cooling can be obtained per unit volume of methanol, and the cooling loss is reduced as well; as a result, the temperature of the methanol flowing to the top of the washing tower is lowered.
#When all of the CO2 has been absorbed, the amount of cooling capacity obtained is constant; the less the circulation volume, the more cooling capacity per unit of methanol, and the lower the temperature at the top of the scrubber tower#
#When the load on the system remains constant, the amount of cooling capacity available to the system is essentially fixed. If the flow rate of methanol is high, less cooling is produced per unit volume of methanol, resulting in a higher temperature. Furthermore, due to the large volume of methanol in circulation, and the temperature difference in the heat exchangers, there is an increased loss of cooling capacity. Therefore, when the volume of methanol circulating is low, more cooling can be obtained per unit volume of methanol, with fewer losses as well; as a result, the temperature of the methanol reaching the top of the methanol washing tower is reduced. Quick reply here#
When the system load remains constant, the amount of cooling capacity available to the system is essentially fixed; if the volume of methanol in circulation is large, less cooling is obtained per unit volume of methanol, and thus the temperature rises. Furthermore, with a large methanol circulation volume, the temperature difference in the heat exchangers leads to increased cooling loss. Therefore, by using a smaller methanol circulation volume, more cooling can be obtained per unit volume of methanol, and the cooling loss is reduced as well; as a result, the temperature of the methanol flowing to the top of the wash tower is lowered
When the load on the system remains constant, the amount of cooling capacity available to the system is essentially fixed. If the flow rate of methanol is high, less cooling is obtained per unit volume of methanol, and as a result the temperature rises. Furthermore, due to the large circulation volume of methanol and the temperature difference in the heat exchangers, heat loss increases. Therefore, when the circulation volume of methanol is low, more cooling can be obtained per unit volume of methanol, with less loss as well; as a result, the temperature of the methanol entering the top of the methanol washing tower is reduced.
When the system load remains constant, the amount of cooling capacity available to the system is essentially fixed; if the volume of methanol in circulation is large, less cooling is obtained per unit volume of methanol, and thus the temperature rises. Furthermore, with a large methanol circulation volume, the temperature difference in the heat exchanger leads to increased cooling loss. Therefore, by using a smaller methanol circulation volume, more cooling can be obtained per unit volume of methanol, and the cooling loss is reduced as well; as a result, the temperature of the methanol flowing to the top of the washing tower is lowered.