Marine diesel engine waste heat recovery system based on combination of thermoelectric power generation and organic Rankine cycle, and a method thereof

Abstract

The invention discloses a marine diesel engine waste heat recovery system based on combination of thermoelectric power generation and the organic Rankine cycle, and a method thereof. The marine dieselengine waste heat recovery system comprises a diesel engine intake subsystem, a diesel engine cooling subsystem, an exhaust gas flow path, a TEG subsystem, an ORC subsystem, a seawater cooling subsystem and an electronic control center. A thermoelectric generator is arranged between the exhaust gas flow path and the diesel engine cooling subsystem to form the TEG subsystem, and the temperature differences between the exhaust gas flow path and the diesel engine cooling subsystem are used for generating electricity; the ORC subsystem and the exhaust gas flow path exchange heat through an ORC evaporator; the ORC subsystem converts thermal energy into electrical energy sent from a generator coaxially connected with an expander through a thermodynamic cycle; the seawater cooling subsystem is used for ultimately condensing ORC working media and diesel engine coolants; the electronic control center is part of a diesel engine ECU, and is used for controlling the driving loop. The marine diesel engine waste heat recovery system has the advantages that the exhaust gas waste heat of a diesel engine and the temperature differences between exhaust gases and the coolants are fully utilized, thewaste heat is recycled and converted into the electric energy for ships and other electrical equipment, and accordingly, the energy conversion efficiency of diesel oil is further improved.

Description

technical field [0001] The invention relates to the field of energy, in particular to the field of waste heat recovery of internal combustion engines, in particular to a combined marine diesel engine waste heat recovery system and method based on thermoelectric power generation and organic Rankine cycle. technical background [0002] With the further deepening of economic globalization, a large amount of international trade has accelerated the development of the shipping industry, and because there is no suitable alternative power source in terms of power density, cost and economy, diesel engines are still irreplaceable for shipping. . However, due to the irreversibility in the energy conversion process, the efficiency of the marine diesel engine is only 48%-51%, and the rest of the energy is dissipated in the atmosphere in the form of heat energy such as exhaust gas and cooling water, resulting in a waste of energy. [0003] Therefore, various advanced combustion technolog...

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Problems solved by technology

[0004] Existing waste heat recovery technologies mainly include turbocharging technology, thermoelectric power generation technology, organic Rankine cycle, Karina cycle, waste heat refrigeration technology, seawater desalination technology, and combined cycle technology using a variety of above technologies, but these technologies Both have the disadvantage of insufficient utilization of heat source energy

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