Daily question in the tower equipment technology exchange area – participate in the prize-winning activity～(02.16)
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What are the symptoms of a clogged reflux oil nozzle in a dry vacuum pump? How should it be handled?
1. A full liquid level in the top condensate tank can affect the condensation at the tower top; in more severe cases, it can cause liquid phase to be entrained into the vacuum. 2. The temperature gradient in the tower body gradually disappears, with almost the same temperature at the top and bottom; as a result, the heavier components at the bottom of the tower are carried upward to the top of the tower, and even to the condenser at the top or to the vacuum lines or vacuum pumps. Treatment: The feed and discharge should be promptly cut off, the heating at the bottom of the tower stopped, and the valve to the vacuum pump closed; meanwhile, the issue with the nozzle should be identified and addressed.
1. When the condensate tank at the top of the tower is full, it affects the condensation process there; in severe cases, this can lead to liquid phase being carried along with the vacuum. 2. The temperature gradient in the tower body gradually disappears, causing heavy components at the bottom of the tower to be carried up to the top. Treatment: Cut off the feed and discharge, stop heating at the bottom of the tower, close the valve of the vacuum pump, and simultaneously investigate and address the issue with the nozzle.
1. When the condensate tank at the top of the tower is full, it affects the condensation process there; in severe cases, this can lead to liquid phase being carried along with the vacuum. 2. The temperature gradient in the tower body gradually disappears, causing heavy components at the bottom of the tower to be carried up to the top. Treatment: Cut off the feed and discharge, stop heating at the bottom of the tower, close the valve of the vacuum pump, and simultaneously investigate and address the issue with the nozzle.
1. When the condensate tank at the top of the tower is full, it affects the condensation process there; in severe cases, this can lead to liquid phase being carried along with the vacuum. 2. The temperature gradient in the tower body gradually disappears, causing heavy components at the bottom of the tower to be carried up to the top. Treatment: Cut off the feed and discharge, stop heating at the bottom of the tower, close the valve of the vacuum pump, and simultaneously investigate and address the issue with the nozzle.
The temperature in the upper middle part of the tower rises, causing pressure to build up in the tower. Cut off the heated steam and close the inlet and outlet valves; this is my experience when operating the tower.
The flow rate in the unblocked areas increases, resulting in severe deviation of the liquid flow; this greatly reduces the efficiency of heat and mass exchange between the distillation section and the gas phase. As a result, separation is not achieved, which in turn affects the entire process. The nozzle needs to be cleared as soon as possible. An alternative feeding structure that does not use a nozzle can be employed.
For materials that crystallize easily, the vacuum level can be reduced appropriately. To avoid disrupting the normal production in subsequent stages, measures similar to those used in atmospheric pressure distillation towers can be employed (increasing reflux to disperse the crystals, raising the temperature slightly, reducing the volume of material processed, etc.). For heat-sensitive materials, the product is transferred to an intermediate tank (and then returned to the tower for further distillation after the issue is resolved), in order to address special operating conditions and buy time