Low-temperature multi-effect distillation seawater desalination system

Abstract

The invention relates to the technical field of seawater desalination, in particular to a low-temperature multi-effect distillation seawater desalination system, which is used for increasing the seawater concentration rate. The Low-temperature multi-effect distillation seawater desalination system comprises a plurality of tandem evaporation sets with a reverse flow sequence and a direct flow sequence, a condenser communicated with the evaporation set with lowest running temperature in the reverse flow sequence, a seawater feeding pipeline communicated with the condenser, a steam feeding pipeline communicated with the evaporation set with highest running temperature in the direct flow sequence, and inter-group water pumps arranged on inter-group seawater pipelines. According to the low-temperature multi-effect distillation seawater desalination system, the tandem evaporation sets are divided into the reverse flow sequence and the direct flow sequence, a raw material-seawater enters the evaporation sets with the gradually increased temperature in the reverse flow sequence step by step according to the reverse flow sequence for evaporation and concentration, and the evaporated and concentrated seawater enters the evaporation sets with the gradually reduced temperature in the direct flow sequence step by step according to the direct flow sequence for further evaporation and concentration, so that the seawater concentration rate is increased.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a low-temperature multi-effect distillation seawater desalination system. Background technique [0002] Low-temperature multi-effect distillation seawater desalination technology refers to the multi-effect distillation desalination technology whose maximum evaporation temperature of seawater is lower than 70℃. The evaporation temperature of the first-effect evaporator is higher than that of the latter-effect evaporator, so that the desalination process of distilled water that is multiple times the amount of steam is obtained. [0003] In the existing low-temperature multi-effect distillation seawater desalination system, in the process of low-temperature multi-effect distillation, the concentrated seawater will be directly discharged to pollute the environment. Therefore, the concentrated seawater is generally supplied to the salt field and further concentrated to m...

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Problems solved by technology

[0003] In the existing low-temperature multi-effect distillation seawater desalination system, in the process of low-temperature multi-effect distillation, the concentrated seawater will be directly discharged to pollute the environment. Therefore, the concentrated seawater is generally supplied to the salt field and further concentrated to make salt. The higher the salt production cost, the lower the corresponding salt production cost; however, when using the existing low-temperature multi-effect seawater distillation and desalination system to desalinate seawater, the seawater concentration rate is low, so the cost of salt production is reduced less

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