High-temperature high-pressure sealing water
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In multi-nozzle gasification, a high-temperature and high-pressure sealed water stream (120°C, 6.85 Mpa) is required to be introduced into the wash tower. What is the purpose of this water? Add it directly to the tower? It’s still used for sealing; where does the water go in the end? Calculating the material balance of the wash tower suggests that this water did not enter the tower.
Where does the high-temperature, high-pressure sealed water mentioned by the poster enter the wash tower? This high-temperature, high-pressure sealing water actually comes from the boiler feedwater. There are two places where this water is used to wash the towers: firstly, it is used for instrument flushing, such as for flushing level gauges ； The other route is for supplying water to the trays; when the gasifier is in operation but the shift reactor has not yet started up and no condensate is returning to the gasifier, this water is used to supply water to the trays of the wash tower. So the original poster only mentioned this route, but didn’t specify which one exactly? But no matter which path it takes, the added water eventually ends up in the water system, and it is not taken into account in the material balance of the process package. In material balance calculations, continuous materials are taken into account, while discontinuous materials are not included at all. Additionally, although the seal water in some pumps is also continuous, it is still not included in the material balance. Instrument flushing water and pump seal water are not included in the system water balance; instead, the balance is achieved by increasing the amount of wastewater discharged. As a result, the design margins for the wastewater discharge pipelines and the equipment installed on them are generally quite large.
Whether it is high-pressure seal water or low-pressure seal water, it ultimately ends up in the gasification system, and this should be taken into account in the actual gasification material balance calculations. However, it is also necessary to carefully consider the material imbalance caused by changes in the liquid level of various containers before and after the calculations.
I’ve learned that the high-temperature, high-pressure sealing water is supposed to be used as flushing water for the instruments in the water washing tower. Indeed, it wasn’t taken into account in the material balance