Engine exhaust gas and waste heat utilization system based on single-screw expansion engine

Abstract

The invention discloses an engine exhaust gas and waste heat utilization system based on a single-screw expansion engine, which belongs to the fields of energy conservation and emission reduction. The system disclosed by the invention comprises the following four modules: a heat source flowing module, a closed loop module of an organic Rankine cycle, a closed loop module of a cooling system and a control module. The system disclosed by the invention can automatically call the open angle of a program adjusting voltage ratio control valve in a single chip microcomputer to realize the waste heat recycle of different levels and recycle the energy in engine exhaust gas according to the data of an engine measured by temperature and flow sensors under different working conditions.

Description

technical field [0001] The invention relates to an engine exhaust waste heat utilization system based on a single-screw expander, which is mainly used for recovering the heat taken away by the engine exhaust, and belongs to the field of energy saving and emission reduction. Background technique [0002] A large number of experimental data show that the output power of the engine only accounts for about one-third of the fuel combustion energy, and the remaining two-thirds of the heat is taken away by cooling water, exhaust and other methods. The heat taken away by the exhaust gas accounts for about one-third of the fuel combustion energy, and the recovery of engine exhaust waste heat can improve the utilization rate of fuel combustion energy in the engine. At present, the research on the recovery of engine exhaust heat mainly includes gas heat pump (GHP) system, the absorption refrigeration device using combined heat and power for cooling and heating, and the exhaust gas from...

AI Technical Summary

Problems solved by technology

The main disadvantage of this system is that it will increase the back pressure of the exhaust, which will affect the power of the engine. In addition, when the engine is under low-speed and light-load conditions, the heat in the exhaust is not enough to provide the heating required by the cabin. amount, and if the exhaust pipe leaks, it will pollute the air in the car and cause harm to the human body

Therefore, this system is not suitable for the working condition of low speed and small load, and there are certain safety hazards

[0007] From the above analysis, it can be seen that the scope of inapplicability of the mentioned system is mainly for variable speed and variable load conditions and small power engines, and the use of water as the working medium and the use of turbines as the expander have certain limitations.

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