Evaporative seawater desalination system and evaporative seawater desalination method by using wastewater of marine engine

Abstract

The invention discloses an evaporative seawater desalination system and an evaporative seawater desalination method by using wastewater of a marine engine. The system comprises a cylinder sleeve waterheat exchanger, a first-stage evaporation chamber, a condenser and a first sea water pump, wherein an air inlet and an exhaust outlet are formed in the first-stage evaporation chamber; a sea water spraying device is arranged in the first-stage evaporation chamber; a liquid collecting tank is formed in the bottom of the first-stage evaporation chamber; a draining outlet is formed in the bottom ofthe liquid collecting tank; an air inlet and an exhaust outlet are formed in the condenser; a condensation tube bundle is arranged on the condenser; a liquid collecting tank is arranged at the bottomof the condenser; a fresh water draining outlet is formed in the bottom of the liquid collecting tank. The seawater desalination system and the seawater desalination method disclosed by the inventionhave the characteristics of high water making ratio, simple system structure and method flow, convenience in operation and maintenance, low cost and the like. A humidifying-dehumidifying seawater desalination method is integrated with a circular cooling water system of the marine engine; the cylinder sleeve water heat exchanger is used for recovering sensible heat of circulating cooling water of the marine engine and most heat required by evaporating seawater is obtained, so that utilization efficiency of ship energy is improved, thermal pollution discharged into ocean and atmosphere is reduced, and economic benefits and environment-friendly benefits are remarkable.

Description

Technical field [0001] The invention belongs to the field of seawater desalination, and in particular relates to an evaporative seawater desalination system and method in this field that utilizes ship engine waste heat. Background technique [0002] Ships do not have a large daily demand for fresh water during navigation or operation, but require high reliability and easy maintenance of seawater desalination devices. At present, the more mature ship waste heat seawater desalination technologies mainly include immersed coil distillation and low-temperature multi-effect evaporation. The equipment used in the immersion coil distillation technology is small in size and low in cost, but the water production efficiency is low and the heating coil is easy to foul; although the low-temperature multi-effect evaporation technology overcomes the problem of easy fouling in the heating coil of the immersion coil distillation technology, The equipment is expensive and complicated in operation...

AI Technical Summary

Problems solved by technology

The equipment used in the immersion coil distillation technology is small in size and low in cost, but the water production efficiency is low and the heating coil is prone to fouling; although the low-temperature multi-effect evaporation technology overcomes the problem of easy fouling of the heating coil in the immersion coil distillation technology, it High equipment cost and complex operation and maintenance

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