Natural suction cooling system for main engine of low-flash-point fuel ship

The utility model relates to a natural air suction cooling system of a low-flash-point fuel ship main engine, and belongs to the technical field of ship energy utilization. Comprising a natural air suction pipeline, a supercharger, a diesel engine, a diesel engine air cooler, an exhaust manifold, a diesel engine air cooler gas-liquid separator and a scavenging box. The natural air suction pipeline is connected with the diesel engine through the supercharger, the diesel engine is provided with a diesel engine air cooler, and the diesel engine air cooler is connected with the scavenging box through a diesel engine air cooler gas-liquid separator; and the exhaust collecting pipe is connected with the supercharger. In order to solve the technical problems in the prior art, the cold energy of the low-flash-point fuel is used for cooling the naturally sucked air of the main engine. By combining the heating requirement of low-flash-point fuel with the cooling requirement of natural suction of a main engine, the heat