Waste heat power generation system of marine diesel engine based on organic Rankine cycle

Abstract

The invention relates to a waste heat recovery system of a marine diesel engine, specifically to a waste heat power generation system of a marine diesel engine based on the organic Rankine cycle, comprising a waste gas boiler which is installed on a ship and takes the waste heat of the marine diesel engine as a heat source. The waste gas boiler is equipped with an evaporator which takes hot water in the boiler as a heat source, wherein the evaporator can heat an organic working medium circulating through the evaporator and generate steam. A medium steam outlet of the evaporator passes through a steam turbine and connects to a booster pump inlet through a cooling medium reflux inlet of the steam turbine, and a booster pump outlet is connected to a medium inlet of the evaporator. The steam turbine drives a generator to make electricity. The waste heat power generation system provided by the invention can improve the efficiency in utilizing the waste heat of marine diesel engines, having a compact structure and reliable operation.

Description

Technical field [0001] The invention relates to a marine diesel engine waste heat recovery system, and in particular to a marine diesel engine waste heat power generation system based on the organic Rankine cycle. Background technique [0002] Ships are the main means of transportation for economic and trade in various countries and play an irreplaceable role in global economic development. According to statistics, more than 90% of the world's imported and exported goods are transported by ship. The main propulsion power of ships includes medium and low-speed diesel engines, gas turbines, and nuclear power. Marine medium and low-speed diesel engines are widely used on commercial transport ships due to their advantages of good economy, high reliability, easy maintenance, long service life, wide power range, good maneuverability, and the ability to burn low-priced low-quality fuel. At present, for medium and low-speed marine diesel engines with excellent performance, only 45...

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Problems solved by technology

(2) On large diesel engine merchant ships with relatively high power and over 10,000 tons, the use of waste gas boilers instead of fuel-fired auxiliary boilers to generate steam for domestic miscellaneous purposes and fuel heating, etc., cannot fully utilize the exhaust waste heat of the main engine, because with the As the engine power increases, the exhaust heat also increases

[0004] The application of the waste heat power generation system for marine diesel engines based on the Rankine cycle in actual ships has the following important restrictive factors: (1) The waste heat power generation system for marine diesel engines based on the Rankine cycle is easy to form wet steam in the steam turbine, and the high-speed small The impact of water droplets on the blades of the steam turbine will cause corrosion damage and shorten the service life of the steam turbine; (2) the density of water vapor is small and the specific volume is large, the steam turbine (especially the height of the last stage blade), the exhaust pipe and the pipeline in the condenser The design size is large; (3) The boiling point of water is high and the latent heat of vaporization is large. The exhaust gas of marine diesel engines belongs to low- and medium-temperature waste heat. The structure is complex and the cost is high; (5) The lower the exhaust temperature of the marine diesel engine, the worse the efficiency and economy of the device. Therefore, the current trend of decreasing exhaust temperature of marine diesel engines makes the development of marine diesel engine waste heat power generation systems based on the Rankine cycle face challenges. greater challenge

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