A single-cycle hybrid cooling system and cooling method for a marine diesel engine

Abstract

The invention belongs to the technical field of diesel machines, and relates to a single-cycle mixing cooling system of a diesel machine for a ship. The single-cycle mixing cooling system comprises a fresh water pump (11), a sea water pump (9), a temperature adjustment device (13), a heat exchanger (8), an air cooler (4) and connection pipelines. According to the single-cycle mixing cooling system of the diesel machine for the ship, different cooling water channels are chosen according to the temperature of cooling water entering the temperature adjustment device (13), and different cooling water circulations are achieved; according to the temperature of the cooling water entering the temperature adjustment device (13), circulating amount of cooling water entering the different cooling water circulations is controlled, then the temperature of the cooling water entering the air cooler and the diesel machine is adjusted, and accordingly the diesel machine has good performance on a high / low work condition and is high in effective efficiency.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, and relates to a single-cycle mixed cooling system and cooling method for marine diesel engines. Background technique [0002] When the diesel engine is working, the temperature of the gas in the cylinder can be as high as 2500°C, and part of the heat generated by the combustion is converted into mechanical energy, which makes the diesel engine output to do work; part of the heat is taken away by the exhaust gas; and part of the heat is transferred to the cylinder head and cylinder. Sets, pistons and valves and other parts. The role of the diesel engine cooling system is to forcibly cool the diesel engine, dissipate the heat of the heated parts to the atmosphere, keep the temperature of the diesel engine in a low range, and at the same time increase the cooling water temperature appropriately to obtain better engine economy index. [0003] At present, most marine diesel engines use a dua...

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Problems solved by technology

[0004] Although the dual-cycle cooling system can meet the cooling requirements of the diesel engine for the supercharged air and the diesel engine itself when the marine diesel engine is fully loaded, it has the following shortcomings: 1. The supercharged air is cooled by sea water. When the diesel engine is in a cold state, due to the air entering The temperature of the seawater in the cooler is low, resulting in a low temperature of the pressurized air entering the cylinder, which is not conducive to combustion, the fuel consumption rate is too high, and the economic performance is not good, especially in severe cold regions; 2. When the diesel engine is under partial load, due to only A fresh water thermostat can only be divided according to the temperature of the cooling water to perform a simple cooling cycle, which will cause excessive cooling, consume too much power of the diesel engine, and reduce the effective efficiency of the diesel engine

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