Thermoelectric conversion system and monitoring method for maintaining engine heat and back pressure balance

Abstract

The invention discloses a thermoelectric conversion system capable of keeping engine heat and backpressure balanced and a monitoring method. Cooling fin pipelines are fully used for precooling of cooling water, and secondary cooling of the cooling water is conducted after heat exchange of thermoelectric device sets. On the one hand, the temperature of the cold end of a heat exchanger can be decreased to a great extent, and on the other hand, the thermal balance of an original cooling system is kept. In addition, a self-operated upstream pressure regulating valve and auxiliary equipment thereof are adopted for controlling the tail gas backpressure of an outlet of an engine exhaust manifold to be consistent with a pressure value when the heat exchanger is not connected as much as possible, so that the backpressure balance of an engine is achieved while tail gas waste heat is recovered for electricity generation. According to the thermoelectric conversion system, the power consumption of an auxiliary system is not increased, and the tail gas waste heat can be efficiently recovered for electricity generation on the premise that the thermal balance and the backpressure balance of the engine are kept so that the thermoelectric conversion system can be widely applied to occasions of traditional fuel engine tail gas thermoelectric conversion recycling, is clean, efficient and free of pollution and has good energy-saving and emission-reducing prospects.

Description

technical field [0001] The invention belongs to the field of energy saving and new energy vehicles, and in particular relates to a thermoelectric conversion system and a monitoring method for maintaining the balance of engine heat and back pressure. Background technique [0002] About 30% of the fuel energy of a traditional fuel engine is discharged as exhaust heat, resulting in a huge waste of energy. Using thermoelectric conversion technology to recover exhaust waste heat for power generation and supply to the vehicle system is an important way to improve its fuel economy. The power of thermoelectric conversion is directly proportional to the temperature difference between the cold and hot ends of each thermoelectric device. At present, most of the existing automobile exhaust thermoelectric conversion systems use an external circulating water pump plus a cooling fan to cool the cooling water to control the temperature of the cold end of the thermoelectric device. A large a...

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Problems solved by technology

[0002] About 30% of the fuel energy of traditional fuel engines is discharged in the form of exhaust waste heat, resulting in a huge waste of energy. Using thermoelectric conversion technology to recover exhaust waste heat for power generation and supply to the vehicle system is an important way to improve its fuel economy

The power of thermoelectric conversion is directly proportional to the temperature difference between the cold and hot ends of each thermoelectric device. At present, most of the existing automobile exhaust thermoelectric conversion systems use an external circulating water pump and a cooling fan to cool the cooling water to control the temperature of the cold end of the thermoelectric device. A large amount of electric energy, and sometimes consumes more electric energy than thermoelectric devices can generate by recovering waste heat from exhaust gas, which results in low overall system efficiency

In addition, the engine exhaust pipe is connected to the heat exchanger without back pressure treatment. The internal flow field structure of the heat exchanger increases the original exhaust back pressure of the engine and reduces the original power, fuel economy and emission performance of the engine. In this case, although the thermoelectric device recovers the waste heat of the exhaust gas to generate electric energy, the gain outweighs the gain.

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