柴油机复合涡轮余热发电系统及电动热管理用电系统综合节油潜力研究

发布时间：2018-09-18 11:25

【摘要】：针对发电复合涡轮余热回收技术对发动机燃油经济性影响的评价及节油潜力的问题,基于自行研制的发电复合涡轮余热回收系统及电动热管理系统,在回收电能得到使用的条件下研究了影响发动机燃油经济性的关键因素及两套系统的综合节油潜力。首先,分别分析了发电复合涡轮转速和发动机入口水温对复合涡轮余热系统的发电功率和热管理电动附件耗电功率的影响,明确了产能及用能的变化规律;其次,基于实测数据分析了试验条件下柴油发动机复合涡轮余热发电与电动热管理用电的实际综合节油能力,明确了影响发动机燃油经济性的关键因素;最后,根据关键因素影响油耗的规律对两套系统的综合节油潜力进行了预测分析。结果显示:柴油发动机在1 300r/min试验转速且负荷分别为25%、50%和75%工况下,复合涡轮发电量均能满足电动热管理附件的用电需求,发动机比油耗与基础发动机相比分别降低7.2%、4%和2.6%;增压涡轮及动力涡轮的等熵效率是影响系统燃油经济性的重要因素,提升等熵效率可降低废气能量回收过程中的泵气损失;在试验转速且负荷为75%工况下,随着等熵效率的提升,比油耗可在实测综合油耗的基础上进一步降低,最大降幅为4.1%,若考虑产、用能平衡策略,则该工况下比油耗可降至180.8g/(kW·h)。所提产、用能方案及分析方法可为基于余热回收技术开展的发动机节能减排研究提供参考。
[Abstract]:In view of the evaluation of the effect of waste heat recovery technology on engine fuel economy and the problem of fuel saving potential, the waste heat recovery system and electric heat management system of power generation composite turbine are developed by ourselves. The key factors affecting the fuel economy of the engine and the comprehensive fuel saving potential of the two systems are studied under the condition of the recovery of electric energy. Firstly, the effects of turbine speed and engine inlet water temperature on generation power and power consumption of thermal management electric accessories are analyzed respectively. Based on the measured data, the actual comprehensive fuel saving ability of diesel engine combined turbine waste heat generation and electric heat management power consumption is analyzed, and the key factors affecting engine fuel economy are defined. According to the law of the key factors affecting oil consumption, the comprehensive oil saving potential of the two systems is predicted and analyzed. The results show that under 1 300r/min test speed and load of 25% and 75% respectively, the power generation of composite turbine can meet the demand of electric heat management accessories. Compared with the basic engine, the specific fuel consumption of the engine is reduced by 7.2% and 2.6% respectively, the isentropic efficiency of the turbocharged turbine and the power turbine is an important factor affecting the fuel economy of the system, and the promotion of the isentropic efficiency can reduce the loss of the pump gas in the process of recovery of exhaust gas energy. Under the test speed and load of 75%, with the increase of Isentropic efficiency, the specific fuel consumption can be further reduced on the basis of the measured comprehensive oil consumption, and the maximum drop is 4.1. If production and energy balance strategy are considered, the specific fuel consumption can be reduced to 180.8g/ (kW h). Under this condition. The proposed production, energy use scheme and analysis method can provide a reference for the research of engine energy saving and emission reduction based on waste heat recovery technology.
【作者单位】：天津大学机械学院;
【基金】：国家重点基础研究发展计划资助项目(2011CB707206)
【分类号】：TK42;TM617

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