Waste heat recovery system and method suitable for variable working conditions of engine

• Main Authors: HAN LINPEI, HUANG QIUTING, LEI XIAOFENG, GUO YAN, REN LIYA
• Format: Patent
• Language: Chinese; English
• Published: 19.04.2022
• Subjects: BLASTING; COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES; HEATING; HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINEPLANTS; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; NOT OTHERWISE PROVIDED FOR; STEAM ACCUMULATORS; STEAM ENGINE PLANTS; STEAM ENGINES; USE OF WASTE HEAT OF COMBUSTION ENGINES; WEAPONS

The invention provides a waste heat recovery system and method suitable for variable working conditions of an engine. The waste heat recovery system comprises a preheater, a three-way valve, a flue gas evaporator, an expansion machine, a heat regenerator, a condensation fan, a working medium pump, a liquid storage tank and a condenser. The system is a single-stage waste heat recovery system based on the organic Rankine cycle, waste heat of engine cylinder sleeve water and waste heat of engine tail gas can be recovered at the same time, and particularly, the flue gas evaporator exchanging heat with the engine tail gas can achieve the heat exchange area between a cycle working medium and the engine tail gas. Therefore, adaptive adjustment of variable working conditions of the engine is realized. 本发明提供了一种适用于发动机变工况的余热回收系统及方法，包括预热器、三通阀、烟气蒸发器、膨胀机、回热器、冷凝风扇、工质泵、储液罐、冷凝器。该系统是一种基于有机朗肯循环的单级余热回收系统，可以同时回收发动机缸套水的余热和发动机尾气的余热，特别是与发动机尾气换热的烟气蒸发器可以实现循环工质和发动机尾气的变换热面积，进而实现对发动机变工况的适应调节。