When a reformer furnace tube locally failed, the whole furnace tube service life will be extended by replacing the failed furnace tube.
当制氢转化炉炉管发生局部失效时，采用局部更换炉管方法可延长整根炉管的使用寿命。
2
After changing the suspension acid distributing tank into tube acid distributor, service life of the drying and absorption towers has been extended effectively.
改造时将分酸装置由分酸槽挂爪式改为管式分酸器，有效地延长了干吸塔的寿命。
3
Mixing time was prolonged and the effect of Ug extended in a larger range and showed extremum points when cross heat exchange tube was introduced.