A regenerative vehicle exhaust gas thermoelectric power generation device based on heat pipe-phase change material

Abstract

The invention provides a heat storage type automobile exhaust gas thermoelectric power generation device based on a heat pipe-phase change material, which belongs to the technical field of automobile exhaust waste heat recovery. The thermoelectric power generation device includes a heat collector and a phase change energy storage device, a heat pipe is arranged between the heat collector and the phase change energy storage device, and the shell of the phase change energy storage device is filled with phase change material LiNO 3 ‑NaCl; the heat from the exhaust gas of the vehicle is transferred to the hot end of the thermoelectric power generation sheet through the collector and the heat pipe. The cold end of the thermoelectric power generation sheet is cooled by the cooling water controlled by the water pump. The voltage controller stores it in the battery pack. The present invention enhances heat exchange through heat pipes, which can effectively improve the performance of the thermoelectric power generation device; stores energy through the phase change energy storage device, prolongs the power generation time of the thermoelectric power generation device, effectively avoids fatigue damage of the thermoelectric power generation device, and prolongs its service life.

Description

technical field [0001] The invention relates to the technical field of vehicle exhaust waste heat recovery, in particular to a regenerative vehicle exhaust temperature difference power generation device based on a heat pipe-phase change material. Background technique [0002] As of the first half of 2020, my country's car ownership has reached 275 million. The increase in car ownership has not only brought about an increase in fuel consumption, but also increasingly prominent environmental pollution problems. Therefore, it is urgent to improve the energy efficiency of automobile engines. Relevant research shows that only 30% of the energy of automobile fuel combustion is converted into the effective work of automobile driving, and 40% of the energy is discharged into the atmosphere with automobile exhaust. If this part of energy can be recovered and utilized, the utilization rate of chemical energy of fuel combustion will be greatly improved. [0003] A thermoelectric powe...

AI Technical Summary

Problems solved by technology

However, when the thermoelectric power generation device is applied to the recovery of waste heat from the exhaust of automobiles, the continuous changes in the working conditions of the car during driving will lead to constant changes in the exhaust temperature, which will cause frequent changes in the temperature of the hot end of the thermoelectric power generation sheet, which brings great difficulties to the application of the thermoelectric power generation module. great challenge

On the one hand, thermoelectric power generation modules are usually welded by materials such as P / N semiconductors, heat-conducting ceramic plates, and heat-conducting gaskets. The thermal expansion coefficients of each material are different. When the temperature of the hot end fluctuates continuously, heat will be generated at the joint of different materials. Stress, it is very likely to cause fatigue damage to the thermoelectric power generation module

On the other hand, temperature fluctuations at the hot end of thermoelectric generators will cause voltage fluctuations, which will greatly increase the difficulty of utilizing the output power, and will also increase the burden on the voltage regulator circuit

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