Falling film condenser of low-temperature multi-effect distillation seawater desalination system

Abstract

The invention relates to the technical field of seawater desalination, and provides a falling film condenser of a low-temperature multi-effect distillation seawater desalination system, a heat exchange tube support frame is arranged in a condenser shell, five groups of water chambers are arranged on the heat exchange tube support frame, and the water chambers are divided into two layers, two groups of upper layers and three groups of lower layers; the water chamber comprises a first channel heat exchange tube bundle set, a second channel heat exchange tube bundle set and a spraying tube bundle, the first channel heat exchange tube bundle set and the second channel heat exchange tube bundle set comprise a plurality of heat exchange tube bundles, the first channel heat exchange tube bundle set is arranged on the lower side of the second channel heat exchange tube bundle set, and the spraying tube bundle is arranged on the upper side of the second channel heat exchange tube bundle set. According to the heat exchange tube bundle assembly, the problems that in a conventional design, a heat exchange tube bundle is small in heat exchange area, low in waste heat recovery rate, tedious in leakage inspection and replacement, extremely prone to scouring and electrochemical corrosion and the like are solved.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a falling film condenser of a low-temperature multi-effect distillation seawater desalination system, which belongs to the field of classification number: C02F1 / 04. Background technique [0002] The low-temperature multi-effect distillation seawater desalination system is to connect a series of effect evaporators (referred to as evaporators) containing spray tube bundles and heat exchange tube bundles in series, and a falling film condenser is set at the end (1. Used for preheating raw seawater, 2. .Forcibly condensing steam, 3.Promoting one-way flow of steam), the heat exchange process mainly distributes the original seawater and concentrated seawater evenly on the outer surface of the heat exchange tube bundle inside the evaporator of each effect body through the spray tube bundle, so that the outer surface of the tube bundle is The seawater absorbs the latent hea...

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Problems solved by technology

[0004]However, straight tube heat exchange tube bundles are generally cheap and easy to install, but the heat exchange area is relatively low, which is not conducive to the full recovery and utilization of steam heat energy; Part of the suspended matter and slime entrained in the original seawater in the shower system is easily blocked in the gap between the two corrugations during the spray water distribution process, resulting in a reduction in the heat transfer area and blockage of the water distribution channel, resulting in a decrease in heat transfer efficiency and a lower water production ratio. Reduction and other issues; limited by the number of heat exchange tube bundles of the falling film condenser and the limitation of internal structural space, it is usually impossible to implement the replacement conditions for the installed heat exchange tube bundles; Reduce the heat transfer area of ​​the falling film condenser, thereby reducing the water production ratio of the falling film condenser in the seawater desalination system. If things go on like this, the low temperature multi-effect distillation seawater desalination system cannot be put into normal production and operation.

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