Device for desalinating seawater by utilizing residual heat of tail gas exhausted by diesel engine

Abstract

The invention relates to an efficient seawater desalinization device for a ship, in particular to a device for desalinating seawater by utilizing the residual heat of tail gas exhausted by a diesel engine. The seawater is sequentially fed into a seawater pretreatment filter (2) and a seawater storage tank (3) by a No.1 pump (1), and is introduced into a condenser (24) in a desalinator (20) by a No.2 pump (5); a horizontal shell and tube heat exchanger (7) is switched on; the flue gas inlet end and the flue gas outlet end of the heat exchanger (7) are connected with each other through a No.1 three-way valve (10); a falling film evaporator (25) in the desalinator (20) is switched on; the seawater outlet of the heat exchanger (7) is communicated to the desalinator (20) through a one-way valve (30); a spraying device (22) is used for spraying; the falling film evaporator (25) is arranged at the bottom of the spraying device (22); seawater accumulated at the bottom of the desalinator (20) is pumped into a heat exchange tube of which the upper part is connected to a seawater film forming device (23) by a circulating pump (15); high temperature flue gas flows outside the heat exchange tube; and a fresh water accumulating disk (21) on the lower part of the condenser (24) is communicated to a fresh water storage tank (18) through a No.5 pump (31). The residual heat of the flue gas is utilized and the emission of pollutants is reduced; and the device has the characteristics of simple structure, high controllability, energy conservation, environmental friendliness, high efficiency and the like.

Description

technical field [0001] The invention relates to a high-efficiency marine seawater desalination device, in particular to a high-efficiency seawater desalination device utilizing waste heat flash evaporation and falling film evaporation of diesel engine tail gas. Background technique [0002] The long-term voyage and long-term stay at sea of ​​ships have a great demand for fresh water. Generally, small and medium-sized ships have limited fresh water reserves and cannot make fresh water by themselves. Moreover, long-term water storage is easy to cause bacterial growth and bring many unfavorable factors. Therefore, how to make the seawater desalination device reliable in performance, convenient in operation, simple in structure and strong in controllability has become an urgent problem to be solved. [0003] At present, most marine desalination devices use distillation, reverse osmosis and flash evaporation. [0004] Reverse osmosis seawater desalination method has the advantag...

AI Technical Summary

Problems solved by technology

[0007] Seawater desalination is the fundamental measure to solve the problem of freshwater supply for small and medium-sized ships, but the traditional seawater desalination method consumes a large amount of primary or secondary energy. Under the background of vigorously advocating energy saving and emission reduction, seawater desalination is realized by using the waste heat of engine flue gas. is the best way to achieve this

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