Because of the direct contact heat transfer, its heat transfer effect is very good and the heat utilization rate is high. Because it does not require a fixed heat transfer wall, the structure is simple, and it is especially suitable for the evaporation of materials that are easy to crystallize, scale and corrosive. It has been widely used in waste acid treatment and evaporation of ammonium sulfate solution.
However, if the evaporated material liquid is not allowed to be contaminated by the flue gas, this type of evaporator is generally not applicable. Moreover, due to the existence of a large amount of flue gas, the utilization of secondary steam is limited. In addition, the nozzle is easily damaged because it is immersed in a high-temperature liquid.
It can be seen from the above introduction that there are many types of evaporators, each with its own advantages and disadvantages and applicable occasions. When selecting a model, we must first see whether it can adapt to the process characteristics of the evaporated material, including the viscosity, heat sensitivity, corrosiveness of the material, and whether it is easy to crystallize or scale, and then it is required to have a simple structure, easy manufacturing, and metal consumption. Less, convenient maintenance, good heat transfer effect and so on.
