Medium circulation system for exhaust heat indirect type temperature-difference thermoelectric device for marine diesel engine

Abstract

The invention discloses a medium circulation system for an exhaust heat indirect type temperature-difference thermoelectric device for a marine diesel engine. The medium circulation system comprises a hot-end circulation unit, a cold-end circulation unit and a controller. The hot-end circulation unit comprises a gas-liquid heat exchanger, a gas inlet pipeline, a gas outlet pipeline and a heat-conducting oil circulation pipeline capable of conveying heat-conducting oil to the hot end of the temperature-difference thermoelectric device. The cold-end circulation unit comprises a cooling medium circulation pipeline capable of conveying a cooling medium to the cold end of the temperature-difference thermoelectric device. The controller is used for controlling the flow of the heat-conducting oil and the flow of the cooling medium according to the temperature measurement values of temperature sensors. By the adoption of the medium circulation system for the exhaust heat indirect type temperature-difference thermoelectric device, under the condition of the working condition change of the diesel engine, self-adaptive control over medium circulation of the hot end and the cold end of the thermoelectric element is achieved, it is guaranteed that the temperature of the hot end and the cold end of the temperature-difference thermoelectric device is stable and controllable, and thus the design application and the good power generation output quality of the large-power temperature-difference thermoelectric device can be guaranteed.

Description

technical field [0001] The invention relates to the field of energy saving and environmental protection of marine diesel engines, in particular to a medium circulation technology of an indirect thermoelectric device for exhaust waste heat of marine diesel engines. Background technique [0002] Exhaust waste heat temperature difference thermoelectric technology, as a green energy-saving technology, has attracted widespread attention due to its high utilization rate of waste heat per unit volume, simple structure, and no moving parts. At present, the application research of exhaust waste heat thermoelectric technology at home and abroad is mostly focused on the energy recovery and utilization of vehicle engines, and it is still blank in the application field of marine diesel engines. In terms of structural type, the application of vehicle engines at this stage is mainly to attach thermoelectric elements to the engine exhaust pipe, and the engine exhaust directly provides the t...

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Problems solved by technology

[0003] 1. Because the temperature of the hot end of the thermoelectric device is directly related to the exhaust temperature of the diesel engine, it will fluctuate greatly with the change of the diesel engine's working conditions. During the operation, it is impossible to control the temperature of the hot end of the thermoelectric device stably, and it is difficult to ensure stability power output;

[0004] 2. Thermoelectric components have an applicable temperature range. Fluctuations in exhaust temperature may cause thermoelectric components to work outside this temperature range. If the temperature of the hot end is too low, the power generation effect will not be ideal, and the long-term work under the condition of too high temperature Will cause damage to thermoelectric components;

[0005] 3. Due to the limitation of the installation space of the exhaust pipe of the marine diesel engine, it is difficult to flexibly design the structure and layout of the thermoelectric module according to the actual application requirements by adopting the direct temperature difference thermoelectric type, and the design and application of the higher power temperature difference thermoelectric device has also become difficult;

[0006] 4. Since the operation process of the heat-carrying medium at the cold and hot ends of the thermoelectric device cannot be controlled, the utilization rate of the exhaust waste heat of the engine by the direct thermoelectric device is low

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