Waste heat desalinating system and desalinating method for ship

Abstract

The invention discloses a waste heat desalinating system and a desalinating method for a ship. The system comprises a heat recovery steam generator, a steam compressor, an organic medium Rankine (ORC) cycle, a hot water tank, a cold water tank, a hot water heat recovery heat exchanger and a drain water heat recovery heat exchanger; the heat recovery steam generator is divided into upper and lower portions by a sealing plate, the lower portion is a flue gas heat recovery chamber, a first valve is arranged on the flue inlet, a flue gas purifier and a second valve for discharge are arranged on the flue gas outlet, and a cooling medium is introduced into a heat recovery heat exchange tube for heat exchange; one of a top steam exhaust port is connected to a vacuum pump through a sixth valve while the other path communicates with an inlet of the steam compressor; the outlet of the steam compressor is connected to the ORC cycle, and the ORC cycle is separately connected to the hot water tank and the hot water heat recovery heat exchanger. The system disclosed by the invention a waste heat steam compressing self-cycle seawater desalinating system and a cold and hot water preparation device for the ship, wherein the system is reasonable in structural design, simple to manufacture, high in quality and high in efficiency and continuously supplies.

Description

technical field [0001] The invention relates to a ship waste heat desalination system and a desalination method, belonging to the field of seawater desalination. Background technique [0002] The scarcity of fresh water resources has become one of the major crises currently facing, especially in the face of the huge water consumption and inconvenient portability of ocean-going ships, people are paying more and more attention to seawater desalination. Due to the influence of the ship itself and many external factors, marine fresh water cannot carry a large amount of domestic fresh water, and the fresh water stored for a long time is also prone to breed bacteria, which is not conducive to the health of the crew. Therefore, it is very important to develop a device that is convenient for seawater desalination . The existing seawater desalination methods are classified according to the principles and methods, and are mainly divided into distillation, membrane, and crystallizatio...

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Problems solved by technology

[0003] Most of the existing ocean-going ships have been equipped with seawater desalination devices to provide domestic water for ships, but these devices have the disadvantages of large and complex equipment, short service life, inconvenient maintenance, low production efficiency, high energy consumption, and high requirements for the working environment. And these desalination devices cannot directly provide high-temperature hot water above 90°C

[0004] At present, the thermal efficiency of the ship main engine is only 35% to 50%, and more than 50% of the heat is lost in the form of waste heat. The waste heat utilization efficiency has been improved to a certain extent, but a large amount of heat is still lost in the form of flue gas and cylinder cooling water

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