On the alkali evaporation process for diaphragm fluid

Check whether there is an excessive amount of non-condensable gas in the second effect.

There are generally several reasons why the second effect stage does not consume steam: excessive non-condensable gas in the steam box, water accumulation in the steam box, salt buildup blocking the heating tubes, or an empty effect stage. The specific cause can only be determined by examining the actual conditions there

Our company’s evaporation process is of the three-effect, four-unit counter-current type. What people mention is not the main reason; the key issue is the absence of a temperature difference between the vapor and liquid in the second effect. Increasing this temperature difference is the fundamental solution to the problem.

If the first effect operates normally and the temperature and pressure of the secondary steam generated remain constant, then a temperature difference between the inside and outside of the heating chamber in the second effect will definitely exist. The main reasons why the second effect stage does not consume steam at this time are \"excessive non-condensable gas in the steam tank, water accumulation in the steam tank, and reduced heat exchange efficiency in the heating chamber\"; a situation of insufficient steam supply generally does not occur (unless the operator is asleep; P). If what the original poster means by “no temperature difference between the secondary-effect vapor and liquid” refers to the temperature difference in the heating chamber, then that’s a bit too much—! The effectors are all washed regularly! If it is the temperature difference between the secondary liquid and the tertiary steam, it should also be corresponding; if it is lower in practice than theoretically, it can only be due to an excessive amount of non-condensable gas in the steam box or water accumulation in the steam box! !

1 Increase the steam pressure. 2 Increase the vacuum level. 3 Is there a problem with the salt extraction system?