Residual heat utilization system and method for marine engine

Abstract

The invention discloses a residual heat utilization system and method for a marine engine. The residual heat utilization system comprises a water vapor Rankine cycle subsystem, an organic Rankine cycle subsystem and an absorption type refrigeration cycle subsystem, wherein the water vapor Rankine cycle subsystem communicates with the marine engine, marine engine part cooling water and high temperature smoke are adopted as a working medium and a heat source of a water vapor Rankine cycle system, heat exchanger outlet smoke of the water vapor Rankine cycle system is adopted as the heat source ofan organic Rankine cycle system, the water vapor Rankine cycle system and the organic Rankine cycle system generate electricity by utilizing residual heat of the marine engine, and an absorption typerefrigeration cycle system performs refrigeration by utilizing the residual heat of the marine engine. According to the residual heat utilization system and method for the marine engine, by means ofcoupling of a variety of thermodynamic systems, gradient utilization on the residual heat of the marine engine smoke and cooling water is realized, the residual heat of the marine engine can be recycled deeply, and cold electricity co-generation can further be realized to meet marine livelihood requirements.

Description

technical field [0001] The invention belongs to the field of energy utilization, and relates to a waste heat utilization system and method of a ship engine. Background technique [0002] The volume of international trade in today's world is developing rapidly, and more than 80% of the transportation volume is completed by ship transportation. The engines of large freight ships are mainly diesel engines, with a thermal efficiency of less than 50%, and more than half of the heat is not utilized and is discharged into the environment with the flue gas and cooling system. If this part of the heat is recycled and converted into useful energy such as electrical energy, cooling capacity, auxiliary power, etc., the efficiency of the ship's engine and the transport capacity of the ship can be effectively improved. [0003] The waste heat of ship engine flue gas and cooling water has great potential for recovery and utilization. International scholars have proposed many methods for u...

AI Technical Summary

Problems solved by technology

The engines of large cargo ships are mainly diesel engines, the thermal efficiency is less than 50%, and more than half of the heat is not utilized and is discharged into the environment with the flue gas and cooling system

Different waste heat recovery technologies are suitable for different temperature ranges, and have different thermal efficiencies in different temperature ranges. However, the existing waste heat utilization systems either use various methods to utilize various waste heat from ships, or only recycle A certain kind of waste heat, neither the coupling utilization of ship flue gas and waste heat of cooling water to achieve the effect of deep utilization of waste heat, nor can it meet the diversified needs of ship energy

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