One question per day: Methanol and purification technology forum version, 20191017

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The effects of low vacuum in a vacuum flash evaporation system and the causes thereof. Feel free to add more! Reason: (1) The heat exchange efficiency of the vacuum flash condenser is poor ； (2) The system has leakage points ； (3) The pressure control valve is faulty ； (4) There is a problem with the vacuum pump’s water seal ； (5) Vacuum pump failure ； (6) High liquid level or full level in the vacuum pump inlet separator ； (7) The vacuum extractor has low steam output or no steam supply. Insufficient vacuum level can lead to: (1) a high temperature of the water after flash evaporation, which raises the temperature of the water entering the sedimentation tank; this affects the efficiency of flocculants in causing sedimentation and results in poorer water quality. (2) The vacuum is insufficient, and flash evaporation is inadequate; as a result, acidic gases in the water cannot be completely removed, affecting the water quality of the system. (3) The amount of flash vapor decreases, resulting in less heat being carried away, which increases the thermal load on the downstream system.