Waste gas waste heat power generation system of ship diesel generator based on organic Rankine cycle

Abstract

The invention discloses a waste gas waste heat power generation system of a ship diesel generator based on an organic Rankine cycle. The system comprises a waste gas boiler, an organic working medium expander, a reducer, an alternating current generator, a regenerator, a condenser, an organic working medium booster pump and an evaporator which is installed on the waste gas boiler, wherein an organic working medium outlet of the evaporator is connected with an inlet of the organic working medium expander, a rotating shaft of the organic working medium expander is sequentially connected with the reducer and the alternating current generator, an outlet of the organic working medium expander is sequentially connected with a first inlet of the regenerator and a first outlet of the regenerator, the first outlet of the regenerator is connected with an inlet of the condenser, the outlet of the condenser is connected with an inlet of the organic working medium booster pump, an outlet of the organic working medium booster pump is sequentially connected with a second inlet of the regenerator and a second outlet of the regenerator, the second outlet of the regenerator is connected with an organic working medium inlet of the evaporator, and waste gas generated by a ship diesel generating unit is fed into the waste gas boiler. By the aid of the system, the waste gas waste heat of the ship diesel generating unit is effectively recycled.

Description

technical field [0001] The invention relates to a waste heat recovery system of a marine diesel generator set, in particular to a waste gas waste heat power generation system of a marine diesel generator set based on an organic Rankine cycle. Background technique [0002] Ships are the main means of transportation for the economy and trade of various countries. In order to be able to perform transportation tasks reliably for a long time, ships cannot do without power supply. Due to a series of advantages such as high thermal efficiency, reliable operation and long service life, diesel generator sets have become the first choice for ship power stations. The power demand of the ship during normal navigation, loading and unloading, entering and leaving the port, and berthing is different, so the load of the diesel generator set is also different, but there is always a diesel generator set that is always on to ensure the normal power demand of the ship. . Diesel engines used f...

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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 exhaust gas boilers instead of fuel-fired auxiliary boilers to generate steam for daily 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 exhaust gas waste heat power generation system based on the Rankine cycle has the following disadvantages: (1) It is easy to form wet steam in the steam turbine, and high-speed small water droplets impact the turbine blades, which will cause corrosion damage and shorten the service life of the steam turbine; (2) The water vapor density is small, the specific volume is large, the design size of the steam turbine (especially the height of the last stage blade), the exhaust pipe and the pipe in the condenser is relatively large; (3) the boiling point of water is high, the latent heat of vaporization is large, and the marine diesel engine Exhaust gas belongs to medium and low temperature waste heat, and the Rankine cycle waste heat power generation system using water as the working medium is not efficient when recovering medium and low temperature waste heat; (4) The system structure is complex and the cost is high; (5) The lower the exhaust temperature of the marine diesel engine, the lower the device will be. The worse the efficiency and economy, the current trend of decreasing exhaust temperature of marine diesel engines makes the development of waste heat power generation systems based on Rankine cycle face greater challenges

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