A system that utilizes the temperature difference of automobile exhaust to generate electricity to improve the conversion efficiency of scr

Abstract

The invention discloses a system for improving the conversion efficiency of SCR by utilizing the temperature difference of automobile exhaust to generate electricity, which comprises an automobile exhaust temperature difference power generation device and an exhaust heating device. Pipeline, cooling water tank, and exhaust heating device include resistance wire mesh, battery, temperature sensor, and ECU; this system uses low-grade automobile exhaust as the heat source, uses circulating water to cool the cold end of the thermoelectric power generation sheet, and uses a voltage stabilizing circuit for cooling. The voltage is stabilized, and the resistance wire mesh is powered by the battery and heats the exhaust to increase the intake temperature of the SCR system. The invention is aimed at low-temperature exhaust working conditions and low-temperature environments, increases the exhaust temperature, promotes urea hydrolysis, improves the conversion efficiency of the SCR system in low-temperature working conditions, and reduces the emission of harmful gases from automobiles.

Description

technical field [0001] The invention relates to the technical field of utilization of waste heat from automobile exhaust and post-treatment of exhaust gas, specifically utilizing the temperature difference between automobile exhaust gas and cooling water to continuously generate electricity and store it, and using the energy to heat the exhaust gas in the pipeline, thereby promoting the pyrolysis of urea, Improve SCR conversion rate. Background technique [0002] While the rapid development of the automobile industry has brought comfort and convenience to people, the increasingly serious energy shortage and exhaust pollution have also become increasingly prominent. During the working process of the automobile engine, about 30%-40% of the energy is discharged into the atmosphere along with the tail gas, and harmful gases such as NOx are produced at the same time, causing energy waste and environmental pollution. In recent years, the decline of oil production and the stricter...

AI Technical Summary

Problems solved by technology

The invention utilizes the waste heat of automobile exhaust to generate temperature difference power generation, without additional power supply to the heating device in the system, and can effectively solve the problem of low exhaust temperature, easy crystallization of urea spray, and low urea pyrolysis rate when the SCR system is in a low-temperature environment and low-temperature working condition and low NOx conversion

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