The flow of the low-temperature methanol wash effluent is poor. Agree
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Dear colleagues, our company’s low-temperature methanol washing unit consists of two washing towers for ammonia synthesis and methanol production. There are currently two abnormal phenomena, and we would appreciate your advice. 1. When the system load exceeds 105%, the liquid level in the lower section of Tower II rises, resulting in a situation where liquid cannot flow through ； 2. Liquid overflow often occurs in the middle section of the CO2 separation tower to the upper section of the H2S concentration tower, resulting in a low liquid level in the upper section of the H2S concentration tower and thereby triggering the interlock of the methanol pump.
1. When the system load exceeds 105%, the liquid level in the lower section of Tower II rises, resulting in a situation where liquid cannot flow through； (1) Please check whether the liquid-to-gas ratio of the liquid coming out of the tower is excessively high ； (2) Whether the tower operating pressure is lower than the designed operating pressure, along with issues of excessive flow velocity and high resistance ； (3) Equipment design flexibility 50-110? Internal equipment inspection: will the tower diameter meet the requirements? 2. There are often liquid non-flow issues from the middle section of the CO2 separation tower to the upper section of the H2S concentration tower, which results in a low liquid level in the upper section of the H2S concentration tower and can trigger the interlock of the methanol pump. Additionally, the composition of the feed gas may deviate from what was designed. (1) Appropriately reduce the operating pressure of the H2S concentration tower. (2) Appropriately reduce the amount of nitrogen gas used
1. The current operating pressure of the scrubber tower is lower than the originally designed pressure； 2. The two measures you mentioned have been in use, and this phenomenon of no liquid flow occurs occasionally, once a week or once every two weeks.
105 is already operating beyond its capacity; are there any other data that differ from those when the load is at 100? It’s easy to judge this way.