Normal Pressure Trial Experiments of Fouling Evaporators of Natural Circulation with Efficiency

A fouling-removal evaporator of natural circulation is developed to solve the fouling problem. The key lies in producing enough great driving force of natural circulation at reasonable heating temperature difference to make twisted tape self-rotate reliably in hear transfer tubes. Therefore, a new evaporator was produced in industry and trial experiments were conducted at normal pressure. It is showed that when temperature difference of heat transfer is only 26 ℃, the driving force of natural circulation can reach more than 11 000 Pa; the twisted tape can be driven to self-rotate reliably and prevent or remove fouling continuously; heat transfer coefficient is increased by more than 10%. Therefore, this new technique can make high profit for industry.