Friends who are engaged in ammonia-alkali alkali production, please participate in the discussion!

Find ways to bring the system to vacuum conditions;

First of all, the best operating condition is to maintain the steam capacity at 90% of the maximum capacity. At this time, the tray efficiency is higher, the steam consumption is lower, the steam is more complete, and the operation stability is good. If the steam volume exceeds the limit or the load is insufficient, it is impossible to simultaneously save steam and reduce ammonia consumption in the distillation operation. Secondly, the flow adjustment of various materials such as steam, gray milk, sand liquid and condensate must meet the proportion requirements, and the increase and decrease time must be orderly. Third, the primary factor that determines the equilibrium partial pressure and evaporation rate of ammonia in the solution is temperature, so we must pay close attention to the changes in relevant parameters that cause temperature changes. Fourth, key equipment structural dimensions can have a long-term impact on separation efficiency. Imperfect parts must be improved, including necessary modifications, to eliminate equipment defects.

A vacuum seems to increase the concentration of ammonia in the gas phase, which is not conducive to the evaporation of ammonia.

What you said on the second floor is right. The current trend of distillation in ammonia-alkali enterprises is towards vacuum distillation. 4#tf176

Gas consumption control: 1. The capacity of the ammonia evaporation tower is properly matched, and the ammonia evaporation tower is ensured to be at optimal load according to the system output. There are 2 aspects to this: Best 1 is the steam volume, ensuring it is at maximum or full load; Best 2 is the working condition, ensuring the indicator is within the normal control range. Once the tower condition deteriorates, it must be stopped in time to avoid the equipment operating at low output rate. 2. Process decision. At present, newly built ammonia and alkali plants are basically gradually transferred from pressure distillation to vacuum distillation. The overall temperature is lower than that in pressure distillation, and the steam consumption is greatly reduced. 3. It improves the utilization rate of low heat potential of the system and increases the temperature of ammonia-containing solutions such as mother liquor and condensate. On the one hand, it recovers system heat and on the other hand, it reduces distillation steam consumption. It can be said to kill two birds with one stone. 3. Operation control: During the control, the best control point is found in the distillation index loss and steam consumption control, which not only ensures the stability of the index, but also reduces the steam consumption to the greatest extent. Ash consumption control: Lime has always been a production bottleneck. The quality of lime raw materials and the quality of operation directly restrict the system capacity and also play a decisive influence on the distillation operation. The control of ash consumption is an important consumption control point for ammonia-alkali enterprises. In the case of ash quantity constraints, how to ensure the quality of ash milk and avoid over-burning and raw burning directly affects consumption and distillation operations. When lime is stable, whether the distillation tower capacity is properly matched and the operation is good or bad is related to the level of consumption. In addition, finding the best control point for ash consumption and ammonia consumption to maximize benefits is also an important factor that directly affects the level of ash consumption.