A multi-channel fresh water preheating heating system and method for a marine diesel engine and a diesel generator

Abstract

The invention discloses a multi-channel fresh water preheating and heating method for a marine diesel engine and a diesel generator. The diesel generators are arranged in multiples, and the freshwater pipelines of the multiple diesel generators are connected in parallel. Steps: In step 1, neither the diesel generator nor the diesel engine is started, and one diesel generator among the plurality of diesel generators is preheated by heating the water in the fifth fresh water circulation pipeline by the preheater; in step 2, after preheating Step 3: Start the diesel engine; Step 4: The heat generated by the operation of the diesel engine heats the water in the first fresh water circulation pipeline, and preheats the unheated diesel generator; Step 4: 5. When the diesel generator reaches the preheating temperature, start the diesel generator; step 6, repeat steps 4 and 5. The method has fast preheating speed, reduces the consumption of ship electric energy, and achieves the effect of energy saving.

Description

technical field [0001] The invention belongs to the technical field of ship construction, and in particular relates to a multi-channel fresh water preheating heating system and method for a marine diesel engine and a diesel generator. Background technique [0002] Before the diesel engine can be started, it is usually necessary to warm up the cylinder. like figure 1 As shown, in the pipeline design, an electric heating unit is usually arranged in the external pipeline of the diesel engine. The electric heating unit heats the fresh water, and then the preheated fresh water is injected into the interior of the diesel engine, and the outflow is returned 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 the diesel generator are each equipped with a...

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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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