The specific purpose of this device, the water seal tank
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Please explain the specific function of the water seal groove.
In the water seal tank, there is a pipe that extends below the liquid surface; the pressure generated by the difference in liquid level height is the pressure before water enters the tank. Above this pressure, the gas overflows from the water seal tank and is discharged through the pipe at the surface of the liquid. To avoid losses due to methanol evaporation, it is necessary to recover and replace this water. However, the water seal tank has a drawback: if the water cooler at the top of the atmospheric pressure tower operates excessively, creating a negative pressure at the top of the tower, it may draw water into the reflux tank, resulting in an excessive level of moisture.
Additionally, it is also possible to maintain a certain pressure in the atmospheric pressure tower
May I ask that our water seal tank is not filled with water; instead, the pressure of the atmospheric tower is adjusted via the valve on the vent pipe. What are the advantages or disadvantages of this?
Simple separation, buffer gas to prevent pressure buildup. It will not cause suction, but it cannot remove methanol from the gases
The new project doesn’t mention any water seal tank for methanol distillation.
It serves a safety purpose; nowadays, many manufacturers install safety valves
No way, is it that easy for a atmospheric pressure tower to develop negative pressure? I haven’t encountered it
In short, it has three functions: 1. Flame suppression (primarily to prevent hydrogen in the non-condensable gases at the top of the tower from causing fires, as well as to stop fires resulting from lightning strikes from spreading into the tower and causing accidents); 2. Prevention of negative pressure; 3. Recovery of methanol
Generally, it is possible to wash away the alcohols carried in the gas, thereby preventing environmental pollution and fires. Additionally, it allows for control of the pressure in the tower, which facilitates operation
The off-gases from the pre-tower and the atmospheric tower should be directed to two separate tanks for washing
There is a certain amount of liquid in the water seal tank; non-condensable gases come into contact with the water and are vented from the top of the tank through a vent pipe, while the wash water at the bottom flows into an underground tank
1. Wash methanol to avoid waste. 2. Prevent fires