ORC (organic Rankine cycle) system for marine main engine waste heat generation

Abstract

The invention discloses an ORC (organic Rankine cycle) system for marine main engine waste heat generation, which comprises an engine tail gas loop, an engine liner water loop, a coolant loop and an external cooling water loop. The ORC system, which is a power system based on the organic Rankine cycle, absorbs the waste heat of engine liner water and engine tail gas. After liner water is adopted to absorb the heat of engine tail gas in the system, the coolant of the ORC system is then heated; meanwhile, the heated coolant is utilized to absorb part of residual heat after heat exchange between the engine tail gas and the liner water. The system can be utilized to effectively solve the problem that the low temperature of marine main engine liner water results in the over-low evaporating pressure and low system efficiency of the ORC system. Meanwhile, because the system utilizes the scheme that tail gas and liner water jointly absorb heat, the problem of coolant pyrolysis caused by direct heat exchange between organic coolant and high-temperature waste heat is solved. While diesel engine waste heat is recovered by the system to the max, the alteration of an existing diesel engine system is little.

Description

technical field [0001] The invention relates to an ORC-based diesel engine waste heat recovery power generation system, in particular to an ORC system suitable for ship main engine waste heat power generation. That is to say, it is a system device based on organic Rankine cycle engine waste heat recovery and power generation. It uses refrigerant (such as R245fa) to absorb heat from engine exhaust and cylinder liner water, and through the four stages of Rankine cycle, external power generation is performed to realize the waste heat of the engine. Recycle. Background technique [0002] With the increasingly severe energy shortage, the energy saving of engines has attracted people's attention. Using the ORC system to recover the waste heat of the engine is not only easy to implement but also has high heat recovery efficiency. The recyclable heat sources of the engine mainly include the heat of the cylinder jacket water and the heat of high-temperature exhaust gas discharged t...

AI Technical Summary

Problems solved by technology

The system of this invention is relatively complicated. The jacket water and exhaust gas heat the preheater and evaporator respectively, which is difficult in terms of performance matching and system control, and part of the energy will be lost after the exhaust gas passes through the SCR.

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