针对某煤制甲醇装置脱瓶颈改造项目存在的问题，建立了甲醇洗涤塔重力流管路系统计算模型，确定了B段集液箱液位与贫甲醇操作负荷的定量关系；根据扩能前后甲醇洗涤塔的负荷变动情况，对该塔4个部分的塔盘水力学进行核算，找到了瓶颈之所在，并提出了有效的改造方案。改造方案实施后，装置达到了设计指标，已顺利开车并达到62万t/a的产能。

Aiming at solving the problems existed in a certain coal to methanol plant,a calculation model for the gravity flow piping system of the methanol washing column is established,and the quantitative relationship between the liquid level of the collector tank of B section and the lean methanol operation load is determined.According to the load changes of the methanol washing column before and after the de-bottleneck renovation,the tray hydraulics of the four sections of the column are calculated and the bottleneck is therefore found.An effective renovation scheme is proposed accordingly.After the implementation of the renovation scheme,this coal-to-methanol plant has successfully put into operation and reached a running capacity of 620 000 tons/year.