Marine power unit cooling and waste heat utilization system and cooling and waste heat utilization method thereof

Abstract

The invention discloses a marine power unit cooling and waste heat utilization system which comprises a marine power unit, a heat conducting oil furnace, an expansion machine, an underwater condenser, a supercharger and a flue gas heat exchanger. A cooling and waste heat utilization method of the marine power unit cooling and waste heat utilization system comprises the following steps: an organic medium in a cylinder sleeve of the marine power unit undergoes boiling phase-changing heat transfer and is turned into a high-temperature and high-pressure gas state, and high-temperature flue gas enters the heat conducting oil furnace for heating heat conducting oil simultaneously; the gas-state organic medium is sent into the expansion machine to push the expansion machine to output mechanical work; and the organic medium after the expansion work is output enters the underwater condenser to be condensed into an organic medium in a low-temperature liquid state, the organic medium in the low-temperature liquid state passes through the supercharger, then enters the flue gas heat exchanger, and completes heat exchange with flue gas in the flue gas heat exchanger, and the organic medium of which the temperature is raised enters the cylinder sleeve of the marine power unit, thereby completing one cooling and waste heat utilization cycle. With the adoption of the marine power unit cooling and waste heat utilization system and the cooling and waste heat utilization method, a power generation system can fundamentally stably operate all year around, the energy consumption of a traditional cooling cycle system is reduced, and the power output / power generation net efficiency is improved.

Description

technical field [0001] The invention relates to comprehensive utilization of waste heat, in particular to a cooling and waste heat utilization system of a marine power unit and a utilization method thereof. Background technique [0002] At present, the production technology of various ship power machines in our country is mature and widely used. The main types of marine power units are basically fuel-powered engines. At present, the function mode of marine power units is mainly to provide ship power, electricity and heat. The conversion and utilization rate of fuel heat is generally less than 40%, and the remaining heat is basically discharged outside except for production heating and domestic hot water. Such as figure 1 As shown, there are two main forms of ship waste heat: exhaust heat of marine power units and heat discharge of cylinder liner cooling circulating water. The exhaust gas temperature of marine power units is about 350-400°C. At the same time, the exhaust g...

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Problems solved by technology

like figure 1 As shown, there are two main forms of ship waste heat: exhaust heat of marine power units and heat discharge of cylinder liner cooling circulating water. The exhaust gas temperature of marine power units is about 350-400°C. At the same time, the exhaust gas temperature drops to 150-200°C and is discharged into the atmosphere. At this time, the temperature difference between the exhaust gas and the ambient temperature is still 120-180°C, and there is room for further utilization; In other words, the temperature of the cooling water entering the cylinder liner of the power unit is 55-65°C, and the discharge temperature is about 85°C. In most cases, the cylinder liner water cooler is used to reduce the temperature of the cooling circulating water of the cylinder liner and discharge the heat to the surrounding water body. Caused a waste of energy, on the other hand caused environmental pollution

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