Two-stage evaporator
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In the carbon dioxide stripping process, why is a booster used in the two-stage evaporator? Should the pressure be controlled at 3.5 KPa or 35 kPa?
A booster is used. . . Of course, it’s for the condensation effect. . . . Negative pressure is not conducive to condensation. . Our factory uses less than 5KP
The main reason is that the pressure in the two-stage evaporator is very low; at this pressure, the condensation temperature of the evaporated vapor is 26 degrees Celsius. Therefore, it is necessary to use a booster to increase the pressure of the evaporated vapor before condensation takes place. The pressure in the two-stage evaporator is maintained at 0.0034~0.004 MPa.
The pressure for the second stage of evaporation is controlled at around 3.3 KPa； The booster is used mainly for the following reasons: 1. It facilitates creating a negative pressure in the two-stage evaporation separator, thereby ensuring the vacuum level required for two-stage evaporation ； 2. Increase the pressure in the secondary evaporation condenser to facilitate the condensation of the evaporated flash vapor ； At the same time, balance the pressures of the first and second stage evaporation condensers to prevent excessive evaporation and condensation in the first stage, which could lead to crystallization. Wait……
The main reason for installing a booster is to facilitate the condensation of the gas phase in the evaporation separator, as the temperature of the circulating water is generally between 26 and 32 degrees. Under such water temperatures and in a vacuum environment, it is difficult for the evaporated gas phase to condense. Therefore, a booster is used to increase the evaporation pressure, so as to ensure both the vacuum required for evaporation and the condensation of the gas phase. Our boosters generally maintain the pressure at around 80 kPa (vacuum level).
A booster is used first to evacuate the two-stage evaporator, and secondly to ensure the smooth condensation of the gas phase after evacuation. Our factory controls the pressure at 3.4 KPa.