Zero-discharge multi-technology coupled seawater desalination device and method

Abstract

The invention discloses a zero-discharge multiple technology coupled seawater desalination device and method. The device comprises a vacuum spray flashing chamber, a multi-effect evaporation device, a high-pressure pump, a compressor, delivery pumps, fresh water coolers, a raw seawater pipeline, an auxiliary electric heater, a condenser and a fresh water output pipeline, wherein a nozzle of the vacuum spray flashing chamber is connected with a concentrated seawater outlet of a first effect device of the multi-effect evaporation device; a secondary steam outlet of a last effect device of the multi-effect evaporation device and a flash steam outlet of the vacuum spray flashing chamber are connected with an inlet of the compressor; an outlet of the compressor is connected with a heating steam inlet of the first effect device of the multi-effect evaporation device. The device well couples three kinds of seawater desalination technologies including multi-effect evaporation, spray flashing and vapor compression distillation, truly achieves the technology of zero discharge of wastewater, is beneficial for manufacturing salt and extracting other chemical elements, simultaneously has the characteristics of high energy utilization rate, high heat efficiency and large unit capacity, is suitable for low-cost large-scale production, and can be widely applied to the field of seawater desalination.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a zero-emission multi-technology coupling seawater desalination device and a method thereof. Background technique [0002] my country is a country with serious shortage of water resources. Water shortage has become a major bottleneck restricting the sustainable development of my country's economy and society. Seawater desalination is an effective strategic approach to solve the shortage of freshwater resources in our country. To make seawater desalination economically feasible, it must have a certain production scale. At present, the seawater desalination methods suitable for industrialization mainly include distillation and reverse osmosis, and distillation is more suitable for large-scale devices. At present, the distillation methods that are widely used mainly include three seawater desalination technologies: multi-effect evaporation, multi-stage fl...

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Problems solved by technology

However, in the countercurrent method, when the feed liquid is sent to the front effect, it takes a preheating process to reach boiling, so the evaporation effect is poor. Since the current seawater desalination project is mainly to obtain fresh water, the countercurrent method is not used in seawater desalination. get related apps

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