Hot-film-coupling seawater desalination device driven by low-temperature waste heat

Abstract

The invention discloses a hot-film-coupling seawater desalination device driven by low-temperature waste heat, belonging to the field of industrial energy saving. The hot-film-coupling seawater desalination device comprises an organic Rankine cycle system, a reverse-osmosis seawater desalination system, a low-temperature multi-effect distillation system and a temperature regulation system, wherein the organic Rankine cycle system is used for driving the reverse-osmosis seawater desalination system to produce fresh water, and a heat source is provided by the waste heat discharged by the organic Rankine cycle system to the low-temperature multi-effect distillation system so as to fresh water; the temperature regulation system is used for regulating the temperature of raw material seawater entering the reverse-osmosis seawater desalination system. According to the hot-film-coupling seawater desalination device, the organic Rankine cycle system, the reverse-osmosis seawater desalination system and the low-temperature multi-effect distillation system are combined, so that the efficient utilization and the deep utilization of the industrial waste heat are improved, and the requirements of different seawater desalination users on the water quality and the water yield are met.

Description

technical field [0001] The invention relates to a device capable of efficiently utilizing waste heat and preparing fresh water, and belongs to the field of industrial energy saving. Background technique [0002] Water resources are the material basis of all production and life in human society. Without water and water resources, there will be no human beings. Since the 21st century, the problem of water resources has become an important restrictive factor that plagues the economic and social development of countries all over the world. At present, solutions to water shortages in local areas commonly used in countries around the world include remote water transfer, underground water intake, and construction of reservoirs, etc. However, long-term use has caused many disadvantages such as depletion of water resources, waste of land, ground subsidence, and ecological damage, which cannot be fundamentally resolved. Freshwater crisis. [0003] After decades of development, seawa...

AI Technical Summary

Problems solved by technology

In recent years, reverse osmosis membrane technology, seawater pretreatment technology, high-pressure concentrated brine recovery technology and other related technologies have made great progress, making the production cost of reverse osmosis seawater desalination continue to decline, but the life of reverse osmosis membrane and high-pressure pump Energy consumption still restricts the further promotion of reverse osmosis seawater desalination

A Chinese patent discloses "A Reverse Osmosis Seawater Desalination Device Based on Organic Rankine Cycle" (patent number: 201520140199), using low-temperature waste heat Organic Rankine Cycle (ORC) as the high-pressure pump required for reverse osmosis seawater desalination (SWRO) technology Provide power source, reduce the energy consumption of reverse osmosis seawater desalination (SWRO) technology, but the equipment cost of reverse osmosis seawater desalination (SWRO) technology has not been significantly reduced, because the reverse osmosis membrane is a semi-permeable membrane, which is expensive, The lifespan is not long, with about 50% attenuation every year, and the water production rate is reduced; and because of the high resistance of the reverse osmosis membrane, it is necessary to use a high-pressure pump to continuously provide power during operation, which further reduces the life of the reverse osmosis membrane; at the same time, the reverse osmosis seawater Desalination (SWRO) technology produces fresh water with a salt content of about 300ppm, which cannot be directly applied to users with high water quality requirements, and the production flexibility is low

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