Methanol flash tank
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Why should the pressure in the methanol flash tank be around 0.5 MPa?
At high pressure, dissolved gas does not release easily and tends to be carried over into the distillation process; at low pressure, methanol loss is likely to occur.
The main function of the flash tank is to remove the non-condensable gases dissolved in crude methanol. The higher the pressure, the greater the solubility of gases; therefore, a lower pressure is required for the flash tank.
It is also necessary to ensure there is sufficient pressure to deliver methanol to the storage tank.
Everything said is correct! Top tier!
Reply to 1# 13093962162: It can be controlled even lower, at 0.2–0.3 MPa. It facilitates subsequent processing.
I did the calculations: 1. Kinetic energy is required to enter the tower; 2. Potential energy is needed due to the height of the feed inlet; 3. There are energy losses in the pipes; 4. There are also energy losses related to valves, preheaters, and flanges
1. Low-pressure flashing: the lower the pressure, the more non-condensable gases dissolved in crude methanol can be removed, thereby reducing the operations in the distillation and pre-distillation towers. 2. Another function of the flash tank is to supply material to the distillation process; if the pressure is too low, there isn’t enough kinetic energy to supply material to the distillation process. 3. If transfer is carried out through an intermediate tank area, the pressure in the flash tank can be controlled at around 0.3 MPa.
Everyone explained it very well; I’ve learned something from it.
The function of the flash tank is to flash off the syngas dissolved in the crude methanol and to reduce the pressure to around 0.5 MPa, thereby achieving this effect. Additionally, the crude methanol is pushed to the distillation and filling areas by its own pressure, which helps to save energy and improve economic efficiency.