Bottom liquid level of atmospheric pressure tower
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Our factory has an annual production capacity of 300,000 tons of methanol. I am planning to give a lecture at our factory on the factors that affect the liquid level at the bottom of the atmospheric pressure tower, but I have limited information available. I would appreciate the help of my colleagues; thank you. Anything that can cause a change in the bottom liquid level of the atmospheric pressure tower, or anything whose effect on the bottom liquid level of the atmospheric pressure tower can lead to those other conditions, will do.
The liquid level should not be higher than the top of the reboiler, as this hinders vaporization; it also should not be lower than the bottom of the reboiler, as this can lead to dry burning, which is unsafe and damages the equipment； Special cases require special treatment
The level of the liquid at atmospheric pressure can be used to control the temperature in the stripping section of the atmospheric pressure tower. The pressure and temperature of the atmospheric tower, the temperature and volume of the reflux stream, as well as the feed rate, also affect the liquid level in the atmospheric tower.
Components of refined crude methanol, steam in the pressure column, reflux, the volume of feed to the three columns, reflux from the three columns, and the volume of circulating water in the top condenser. Three-tower pressure. Yantra alcohol recovery rate.
It mainly involves the feed rate, reflux, temperature, and the timely removal of residual liquid
The factors with a more significant impact are the heating amount, feed rate, reflux rate, residual liquid recovery rate, and product recovery rate. There are other factors with relatively weaker impacts, such as the cooling effect of the cooler and pressure.
With constant alcohol content and temperature, the liquid level in the atmospheric pressure column is still very important, because as a cooler for the pressurized column, changes in the liquid level of the atmospheric pressure column are equivalent to an increase or decrease in the cooling area of the pressurized column. As for the atmospheric pressure tower itself, if the liquid level is too low, it is possible that the alcohol content in the wastewater increases; if the liquid level is too high, it’s the same as what was mentioned by those upstairs.
The liquid level in the atmospheric pressure column is closely related to that in the pressurized column, as the reboiler of the atmospheric pressure column serves as the cooler for the pressurized column. A high liquid level in the atmospheric pressure column leads to increased gas condensation in the pressurized column, which in turn causes changes in the temperature and pressure at the top of the pressurized column； A high liquid level in the atmospheric pressure tower can cause the methanol content in the liquid at the bottom of the tower to exceed the specified limit.
Steam consumption, reflux rate, production volume, atmospheric pressure in the tower, and the composition of crude methanol should all have an impact; please experts explain in detail!
Could someone tell me more in detail, please?
Factors that affect the liquid level in the atmospheric pressure tower include feed rate, draw-off rate, reflux rate, and steam addition rate. The effects of changes in the liquid level of the atmospheric pressure tower on other aspects: if the liquid level is too high. This increases the vaporization resistance; to maintain constant temperature and pressure at the bottom of the tower, it is necessary to increase the amount of steam used. This can lead to an increase in the temperature at the top of the tower, with heavier components rising upward. If this level becomes too high, flooding may occur, reducing the heat exchange area. In a pressurized tower, this results in incomplete cooling of the gas at the top, thereby having an adverse effect on the tower. If the temperature is too low, as well. The upward gas flow rate in the atmospheric pressure column decreases, disrupting the vapor-liquid equilibrium.