Heat exchange tube of low-temperature multi-effect seawater desalination device and evaporator composed of heat exchange tube

Abstract

The invention belongs to the technical field of seawater desalination, and provides a heat exchange tube of a low-temperature multi-effect seawater desalination device and an evaporator composed of the heat exchange tube, a plurality of effect evaporators are connected in series through connecting flanges, a heat exchange tube supporting frame is arranged in an evaporator shell, the heat exchange tube supporting frame is fixedly connected with the evaporator shell, a plurality of heat exchange pipes are arranged in the heat exchange pipe supporting frame, an inlet pipe plate and an outlet pipe plate are arranged at the two ends of the evaporator shell respectively, the heat exchange pipes are fixed through the inlet pipe plate and the outlet pipe plate, a fresh water collecting box is arranged on the outlet pipe plate, a fresh water collecting pipeline is arranged on the fresh water collecting box, and a spraying pipe is arranged on the upper portion in the evaporator shell. A salt water collecting pipe is arranged in the lower portion in the evaporator shell, a demister is arranged at the outlet end of the evaporator shell, the demister is a louver type steam demister, and an outlet of the demister is connected with a condenser.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a heat exchange tube of a low-temperature multi-effect seawater desalination device and an evaporator composed of the same. Background technique [0002] The low-temperature multi-effect seawater desalination device is a series of evaporators (referred to as effects) that contain spray tube bundles and heat exchange tube bundles. Heat the outer surface of the tube bundle, the seawater on the outer surface of the tube bundle absorbs the latent heat of the steam and vaporizes, the steam on the inner wall of the tube bundle condenses into fresh water, and undergoes multiple evaporation and condensation in the device to obtain desalinated water that is multiple times the amount of steam. [0003] At present, low-temperature multi-effect seawater desalination devices usually use copper alloy, aluminum alloy and titanium tubes and other straight tube or external thread tu...

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Problems solved by technology

[0006] Due to the complex internal structure of the low-temperature seawater desalination device, it is usually difficult to inspect and maintain all the heat exchange tubes in the effect for a certain effect; during the long-term operation of the device, some heat exchange tubes are corroded, and cannot be dismantled separately Usually, it is difficult to check and cannot be replaced, which affects the quality of the desalinated water in the system; the existing technology judges the work of the corrosion part to be complicated and laborious; the spraying process of the spray system causes the scouring effect on the heat exchange tube bundle, causing Thinning, or even perforation, will eventually lead to leakage of heat exchange tubes; existing effective body evaporators mostly use straight tubes such as copper alloy, aluminum alloy, and titanium tubes as heat exchange tubes. The space utilization rate of the device is low, and the heat exchange efficiency is reduced

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