Novel low-temperature multi-effect seawater desalination evaporator

Abstract

The invention relates to a novel low-temperature multi-effect seawater desalination evaporator in which multi-effect evaporators are arranged up and down. The top end of each evaporation chamber is provided with a water distribution device; a water inlet end of the water distribution device of the uppermost evaporation chamber can be or not be provided with a preheater; a heat exchange tube is arranged in each evaporation chamber; the front and back ends of each heat exchange tube are respectively provided with a tube plate; the outer side of each tube plate is provided with a freshwater tank; the lower side of each heat exchange tube is provided with a concentrated water tank; every two adjacent upper and lower freshwater tanks are connected through a J-shaped inter-effect freshwater connecting tube; the concentrated water tank on the upper layer is communicated with the upper side of the water distribution device of the evaporator on the lower layer through a J-shaped inter-effect freshwater connecting tube; and secondary vapor generated by the upper evaporation chamber enters the heat exchange tube of the lower evaporation chamber through inter-effect vapor connecting tubes positioned on two sides of the back side of an evaporator tube bank to be used as an evaporation heat source. The novel low-temperature multi-effect seawater desalination evaporator can enhance the seawater concentration ratio, does not need any inter-effect pump, lowers the energy consumption for seawater desalination, and ensures that influent water of the multi-effect evaporation chamber with higher evaporation temperature is raw seawater, thereby lowering the scaling risk.

Description

technical field [0001] The invention relates to a novel low-temperature multi-effect seawater desalination evaporator, which is used for seawater desalination. Background technique [0002] Seawater desalination, also known as seawater desalination, is the technology and process of separating salt and water in seawater. Distillation, that is, thermal method, is the earliest seawater desalination technology and the most important method for seawater desalination. Seawater desalination by distillation is the process of heating and evaporating seawater, and then condensing the steam to obtain fresh water. [0003] Low-temperature multiple-effect distillation (MED) is one of the most widely used and considered most energy-efficient seawater desalination methods. Its principle is to evaporate heated seawater in multiple series-connected evaporators, and the steam evaporated from the previous evaporator is used as The heat source of the next evaporator is condensed into fresh wa...

AI Technical Summary

Problems solved by technology

The energy consumption of the inter-effect booster pump is saved, but because the seawater only evaporates once, the concentration is relatively low

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