Desalination plant by using engine end gas

Abstract

The invention discloses a seawater desalting device for tail gas of an engine. The device comprises a superconductive pipe heat exchanger(4), a vacuum evaporating pot(6) and a condenser(5) which are orderly connected as a whole, wherein the superconductive pipe heat exchanger(4) is communicated with an exhaust pipe(2) of the engine through a flue gas diversion valve(3), and the condenser(5) has a seawater inlet provided with a sea water replenishing pump(10) and a condensed water outlet provided with a vacuum pump(9) and a fresh water collection pot(8). The invention utilizes the tail gas of the engine which is the waste energy to produce fresh water by the distillation method, which fully utilizes the energy, reduces the emission of pollutants and fully utilizes the heat energy of the tail gas; the seawater desalting device has the advantages of simple running, easy operation and maintenance, low cost, small volume and few requirements of the power section, and can effectively resolve the water supply problem for sailing warships, civilian ships and oil drilling platforms which use engines as power sources or use other devices the temperature of the tail gases of which is more than 80 DEG C, as power sources.

Description

technical field [0001] The invention belongs to the field of desalination of seawater, in particular to a device for desalination of seawater by using the waste heat of engine exhaust gas. Background technique [0002] At present, seawater desalination technology is divided into two categories: 1. To obtain fresh water from seawater, there are distillation method, reverse osmosis method, hydrate method, solvent extraction method and freezing method 2. To remove the salt in seawater, there are electrodialysis method and ion exchange method and piezoosmosis. The most commonly used method for seawater desalination is distillation, and the energy used is mostly electric energy, which consumes a lot of energy. [0003] The distillation seawater desalination device is to strengthen the evaporation of seawater, and then cool and distill fresh water. The heating methods include electric heating, combustion heating, and solar heating. Electric heating and combustion heating consume ...

AI Technical Summary

Problems solved by technology

At present, there are small marine semi-permeable membrane reverse osmosis seawater desalination devices, but the cost is high, the device is complicated, and the energy consumption is large.

[0005] At present, warships, civilian ships (including passenger ships, transport ships, fishing boats, etc.) and oil drilling platforms used in offshore operations are mostly powered by engines. Generally, about 1 / 3 of the energy of diesel engines is discharged through exhaust gas, and its temperature is as high as 400 ° C. , is a huge waste of energy, and currently this waste energy has not been effectively utilized

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