分析了英国戴维气冷-水冷式反应器串联工艺中甲醇合成催化剂使用寿命缩短的原因，对气冷-水冷式反应器串联工艺进行改造，采用增加1台与原水冷式反应器相同的水冷式反应器、2台水冷式反应器并联后再与原气冷式反应器串联的方式，达到预期效果，为同类装置出现类似问题提供了切实可行的解决方案。

The reasons for shortening lifespan of methanol synthesis catalyst in Davy gas-cooled water-cooled reactor cascade process is analyzed, and the cascade process is modified as well. A new water-cooled reactor that is the same as the original water-cooled reactor is added. These two water-cooled reactors are set in parallel and then connected in series with the original air-cooled reactor, and the expected effect is achieved after renovation. This process modification scheme provides a practical solution for similar problems in the field of methanol synthesis.