operation process

According to the way to evaporator add raw materials, can be divided into and flow upstream charging, feeding peace flow charging three evaporation process. Here in three effect as an example, this:

1. And evaporation process flow
And flow three-way evaporation process, solution and heating steam flow of the same, according to the order from the first effect began to flow to the third after effect over. One heating steam points two kinds, the first effect is born steam, namely the other steam generator steam is produced, the second effect and the third effect of the steam is second steam, the first effect evaporation of the steam produced is the second effect of evaporation heating steam, the second effect produced two steam of evaporation is the third effect of evaporation heating steam. Raw material liquid into the first effect concentrated from bottom out, and in turn into the second effect, the third effect, in the second and third effect is continuous effect concentration. Completed by a third from bottom liquid effect.

The advantages of the method and flow feeding use of the effect of pressure difference between material conveying liquid; Because of the temperature and pressure is higher than the former effect later effects can do not set preheater; Less auxiliary equipment, process is compact, small temperature loss; Simple operation, stable technology, equipment maintenance quantity is little. Its defect is: particularly after temperature drop, the solution viscosity increases by effect, reduce the heat transfer coefficient, need more heat transfer area.

2. Counter-current charging process
In the process of feeding upstream, liquid materials and steam to the opposite. Liquid materials from the end effect to join after evaporation and concentration, with the pump will concentrate into effect at the end of the previous until effect, get complete fluid; Steam from the first born after the condensing heat release effect to join into liquid, producing a second steam into the second effect, in liquid materials of condensing heat into the liquid, the second effect of secondary produce steam into the third effect of raw liquid heating, after releasing heat into liquid cooling system.



Counter-current charging process, because of increased with the concentration of 1:100 temperature effect by increased, so the effect of the viscosity is smaller, the heat transfer coefficient is roughly same; Complete liquid discharge of higher temperature, can be in under pressure further braising enrichment. Its defect is: more auxiliary equipment, need to pump raw material liquid; For each effect in below the boiling point of water next feeding, so must set preheater. Energy consumption is also its shortcomings. Counter-current charging process is mainly used in the high viscosity of liquid concentration.

3. V-wind charging process
In evaporation process v-wind, raw materials were added to the liquid each evaporator, completion fluid from the effect respectively derivations, steam flow from the first effect born into steam, which produces second steam into the second effect and release after heat into liquid condensation, the second effect of secondary produce steam into the third effect, in the third effect after releasing heat into liquid cooling system. This method is mainly used in viscosity, easy to crystallization occasions, also can be used for two or more different liquid and evaporation process.


Much effect evaporation process in the first effect only used raw steam, so save the birth of steam requirements, the effective use of the two times the steam heat and reduce the production cost and improve the economic benefit. In actual production, but also the basic flow above combination, and design more to adapt to the need of the production process much effect.