The impact of gasifier liquid level on ash carrying
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Will too high or too low a liquid level in the gasifier cause ash to be carried along?
It should work. If the water level is too low, the bath isn’t thorough enough; if it’s too high, there isn’t enough space for gas-liquid separation, which results in not only dust but also water being carried along
Level control should be possible using the parameters provided by the software package. :)
It definitely isn’t Shell,,,,,
Can it be assumed that in areas with high water levels, there is more water available, which increases the likelihood of ash being washed away, resulting in less ash being carried away? However, a high liquid level can cause water to be carried in the gas stream. I’m confused; please give the correct answer
Under high load, the liquid level in the gasifier is uncontrolled. A high liquid level results in a longer water bath time, which facilitates ash washing; however, the gas-liquid separation time is short, making it easy for water to be carried along. A low liquid level means a shorter water bath time, but it is not possible to determine whether the ash has been properly washed based on the length of the water bath time.
Although the water bath in the gasifier quench chamber also serves to remove ash, its main function is to achieve separation of slag from water as well as to cool the gas. The removal of fine ash primarily takes place during the water washing stage. Compared to other conditions, a higher liquid level definitely results in better separation and washing effects
It should be related to the operating temperature of the gasifier; higher temperatures make it easier for ash and water to be carried along.
The vaporized ash is carried out of the water bath mainly by bubbles in the water; the quenching water washes away some of the ash that is outside these bubbles. Therefore, the primary factor determining the use of ash is the size of the bubbles formed in water, which is mainly related to the degree of mixing between water and syngas in the liquid phase, as well as the intensity of turbulence. There is a certain relationship with the liquid level, but an excessively high liquid level actually has little effect on the bubbles in the rising phase; instead, it leads to increased splashing and entrainment when the bubbles burst. A too low liquid level is also not good, as insufficient mixing of gas and liquid leads to oversized bubbles or direct short circuits. So, generally, operations are carried out according to the recommended values.