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Published February 29, 2020 | Version v1
Journal article Open

BUILDING A TECHNOLOGICAL MODEL OF THE EXHAUST GAS ENERGY RECOVERY DEVICE FOR THE DIESEL ENGINE ON A SMALL­SIZED VESSEL

Creators

  • 1. The Kherson branch of the National University of Shipbuilding named after Admiral Makarov

Description

Recuperation systems that utilize the energy of exhaust gases from existing diesel engines are designed for large and medium-sized vessels. There is a need to develop an appropriate system to recover the energy of exhaust gases for small-sized vessels.

We have designed a technological model of the recuperation device for small vessels in the form of a thermoelectric generator (TEG) that operates on the exhaust gas energy. Technical conditions for the TEG arrangement on a vessel have been analyzed and the components of its design have been defined. We have proposed technical solutions for improving the process of energy heat transfer from gas to a TEG, namely: the use of thermoelectric modules (TEM) with an operating temperature above 1,000 °С; the application of a square shape of the pipeline cross-section, and the arrangement of a spiral-type cylinder inside the generator pipeline.

Based on the theoretical calculations, we have examined a thermal model of the thermoelectric generator and estimated the technological parameters for using TEM in order to ensure maximum value of efficiency for a TEG. The need to divide the generator into three constituent sections has been identified, which operate as separate generators. We have shown a possibility to receive up to 0.8 kW of electric energy when using a TEG provided the rotation speed of the diesel engine shaft is 1,500 rpm.

An optimal technique for utilizing the generator electric energy has been proposed, which implies the application of a motor-wheel. A motor-wheel function is to transform the excess electrical energy from a TEG into mechanical energy (to support the main engine) within a comprehensive increase in the fuel utilization efficiency. An appropriate circuit to connect a motor-wheel to the vessel's power system has been given.

We have identified ways to improve the efficiency of a thermoelectric generator and extend the scope of its application on small vessels

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Additional details

References

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