Thermal Research And Structure Design Of Waste Heat Desalination Unit

With the increasing number of activities in the oceans of the world, offshore oil and gas exploration, ocean expedition, ocean transportation, maritime rights are more and more frequent. Freshwater is indispensable resource for offshore platform and ship navigation, its supply is particularly important. Climbing film evaporation desalination unit in a vertical tube can use the flue gas waste heat of offshore engineering platform and the cooling water waste heat of marine diesel engine effectively. At the same time, it relies on high-speed steam dragging up to form a liquid film. Sea platform shaking has a smaller effect on liquid film formation and heat transfer characteristics. So climbing film evaporation desalination unit in a vertical tube is especially suitable for sea platform.In this paper, climbing film evaporation desalination system in a vertical tube is the research object. Mathematical models of the thermodynamic process in forward feed, which are considered pressure losses, boiling point increasing, flash evaporation, have been established. What’s more, the paper have not only used C#language to write calculation software of the thermodynamic process but also calculated thermodynamic parameters of the overall system, an evaporator and a condenser.Based on a certain water product and equal area, the paper analyzes the effects of numbers, heating steam temperature, evaporation temperature in last number, concentration ratio to gained output ratio (GOR), seawater flow in condenser, the total heat transfer area. The results show that the numbers of evaporator added, the gained output ratio and the total heat transfer area increased, but seawater flow in condenser reduced. Improving heating steam temperature will reduce the total heat transfer area effectively. What’s more, results indicate that evaporation temperature in last number added, the gained output ratio only increased weakly, but the total heat transfer area increased significantly. A reasonable choice of concentration ratio between1.4-2is good for improving the gained output ratio and reducing the total heat transfer area.Based on instance data for the design parameters, the paper designs an evaporator of climbing film in a vertical tube, a condenser and some auxiliary parts. I plot a total of7CAD engineering drawings and these have a certain significance for the engineering of climbing film evaporation desalination unit in a vertical tube.