Vacuum level
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The vacuum level in the first vacuum flash tank dropped sharply, while the vacuum temperature did not change much. When the vacuum pump was switched off, there was no reaction; instead, the vacuum temperature increased, and the vacuum level in the separation tank also dropped. After a thorough search, the cause was not found. Please help analyze what could be the reasons.
Changes in the vacuum level of the slag water are evident not only in terms of the pressure gauge reading, but also in changes in temperature and liquid level. The occurrence of these phenomena definitely indicates a problem with the vacuum level. A decrease in vacuum level is usually caused by air leakage into the vacuum pipeline. This afternoon, in our company, the vacuum level dropped from -81 to -54, while the temperature rose from 56°C to 76°C; the pipeline was punctured, allowing air to enter the vacuum tank. The hole caused by the puncture wasn’t very large. 1. If the vacuum level doesn’t change much, it’s possible that too much water is being drained from the gasification furnace; as a result, an excessive amount of water enters the flash chamber at low flash point, requiring the vacuum pump to handle a large volume of gas. Try using two pumps. 2. There may be leaks in the vacuum tank, allowing air to enter the system. 3. In water-coal slurry gasification, there is usually a pipeline from the slag pool pump outlet to the flash chamber, and this can also be a source of air leakage into the flash chamber. Check whether the return valve of the slag pool pump on the backup furnace is properly closed. 4. The vacuum inlet valve might be stuck, or the bypass line might not be closed properly, allowing air to enter. 5. The vacuum pump’s pumping capacity is insufficient. 6. There is a blockage in the pump’s inlet pipeline, and it’s a fairly serious blockage