It is understood that most of the thin film evaporators are indirectly heated, and the industry sometimes uses a directly heated thin film evaporator, and the submerged combustion thin film evaporator is directly heated. The proportional combustion gas and air are directly sprayed into the solution, and the temperature of the combustion gas can reach 1200 to 1800 ° C. The temperature difference between the gas and the liquid is large, and the gas causes a bubbling effect on the solution to evaporate the water.
The immersion combustion thin film evaporator has a simple structure, does not require a fixed heat transfer surface, and has high heat utilization rate, and is suitable for evaporation of easily fouling, crystallization or corrosive solution, but is not suitable for processing and can not be contaminated by combustion gas and heat sensitive materials. Evaporation. Currently mainly used in the waste acid treatment industry.
Regardless of the indirect heating of the non-membrane or membrane type thin film evaporator, the main components are the heating tube bundle, so the modification of the heating tube bundle of the thin film evaporator is a method for improving the heat transfer strength of the thin film evaporator. To increase the heat transfer strength of the thin film evaporator, it is often achieved by thinning the liquid film on both sides of the tube or increasing the degree of turbulence in the film. www.syhgzben.com
