Rankine cycling and seawater freshening dual-efficiency waste heat recovery system

Abstract

The invention discloses a Rankine cycling and seawater freshening dual-efficiency recovery system. The system adopts the technical scheme that an evaporator, a steam turbine, a condenser and a working medium pump are sequentially connected, and the steam turbine is connected with a generator shaft, so as to form a Rankine cycling heat power generation system; high-temperature waste gas exhausted by an engine is directly subjected to heat exchange with working medium at the gas side of the evaporator, and a water pump is sequentially and serially connected with the seawater pipe of a three-stage flash evaporating chamber; the seawater in a first-stage flash evaporating chamber is subjected to heat exchange by the condenser, and then is changed into high-temperature seawater to sequentially enter the three-stage flash evaporating chamber, and along with the continuous evaporation of the seawater, the seawater with relatively higher concentration is drained by the concentrate seawater passage of the three-stage flash evaporating chamber; and the interiors of the first-stage flash evaporating chamber, a second-stage flash evaporating chamber and a third-stage flash evaporating chamber are respectively provided with a steam and water separator, and outlets of the three steam and water separators are connected in parallel to form a freshwater delivery passage. When the residual heat of the exhausted gas of the engine is utilized to generate power, the freshwater supply requirements on ships are met by a multi-stage flash evaporating seawater freshening device, so the fuel economy of the ships is greatly improved.

Description

technical field [0001] The invention belongs to the energy-saving technology of internal combustion engines, and in particular relates to a system device for recovering exhaust waste heat of marine engines by combining steam Rankine cycle and multi-stage flash seawater desalination technology. Background technique [0002] As far as large-tonnage ships are concerned, only about 50% of the heat energy generated by diesel engine fuel is converted into the output work of the diesel engine, and the rest is discharged outside the ship through exhaust, cooling water, etc., resulting in a great waste of energy. How to recycle this part of energy has become the primary choice for ship energy saving and emission reduction. The Rankine cycle is widely used in the field of steam turbine power generation, and it is also the main thermodynamic cycle currently used for waste heat recovery. The characteristic of the Rankine cycle is that it can use low-grade heat energy to drive the steam...

AI Technical Summary

Problems solved by technology

If the huge fresh water consumption is all carried by ships, the deadweight tonnage is bound to be reduced, and fresh wa

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