Multi-channel fresh water mutual preheating heating system and method for marine diesel engine and diesel generator

Abstract

The invention discloses a multi-channel fresh water mutual preheating heating method for a marine diesel engine and a diesel generator. The multiple diesel generators are arranged, and fresh water pipelines of the diesel generators are connected in parallel. The method includes the steps that step one, the diesel generators and the diesel engines are not started, and water in a fifth fresh water circulation pipeline is heated through a preheater to preheat one diesel generator in the multiple diesel generators; step two, the preheated diesel generator is started, and the diesel engines are preheated; step three, the diesel engines are started; step four, water in the first fresh water circulation pipeline are heated by heat generated by working of the diesel engines, and the diesel generators which are not preheated are preheated; step five, after the diesel generators reach a preheating temperature, the diesel generators are started; and step six, the step four and the step five are repeated. According to the multi-channel fresh water mutual preheating heating method for the marine diesel engine and the diesel generator, the mutual preheating speed is high, the electric energy consumption of a ship is reduced, and the energy-saving effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a system and a method for preheating the multi-channel fresh water of a marine diesel engine and a diesel generator. Background technique [0002] Before starting a diesel engine, it is usually necessary to warm up the cylinders. Such as figure 1 As shown, in the pipeline design, an electric heating unit is usually arranged on the external pipeline of the diesel engine. The electric heating unit heats the fresh water, and then injects the preheated fresh water into the interior of the diesel engine, and the outflow returns to the preheated fresh water pump. . The circulating hot fresh water makes the cylinder liner inside the diesel engine reach the temperature required by the diesel engine manufacturer, so that the diesel engine can be started. Diesel generators are the same. The diesel engine and diesel generator are each equipped with an electric heating u...

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Problems solved by technology

The diesel engine and diesel generator are each equipped with an electric heating unit. The power of the electric heating unit of the diesel engine is usually very large. For example, the capacity of the electric heating unit of the diesel generator whose model is MAN B&W G50ME-C9.5-TII is 110 kilowatts. Each diesel generator MAN 6L28 / 32H also needs to be equipped with a 12kW electric heating unit, but it still takes a long time to warm up the cylinder of the diesel engine. For example, it takes about 12 hours to heat fresh water from 15°C to 50°C. Therefore, the electric heating process will Consume a lot of ship power

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