【摘要】：針對發(fā)電復合渦輪余熱回收技術對發(fā)動機燃油經濟性影響的評價及節(jié)油潛力的問題,基于自行研制的發(fā)電復合渦輪余熱回收系統(tǒng)及電動熱管理系統(tǒng),在回收電能得到使用的條件下研究了影響發(fā)動機燃油經濟性的關鍵因素及兩套系統(tǒng)的綜合節(jié)油潛力。首先,分別分析了發(fā)電復合渦輪轉速和發(fā)動機入口水溫對復合渦輪余熱系統(tǒng)的發(fā)電功率和熱管理電動附件耗電功率的影響,明確了產能及用能的變化規(guī)律;其次,基于實測數據分析了試驗條件下柴油發(fā)動機復合渦輪余熱發(fā)電與電動熱管理用電的實際綜合節(jié)油能力,明確了影響發(fā)動機燃油經濟性的關鍵因素;最后,根據關鍵因素影響油耗的規(guī)律對兩套系統(tǒng)的綜合節(jié)油潛力進行了預測分析。結果顯示:柴油發(fā)動機在1 300r/min試驗轉速且負荷分別為25%、50%和75%工況下,復合渦輪發(fā)電量均能滿足電動熱管理附件的用電需求,發(fā)動機比油耗與基礎發(fā)動機相比分別降低7.2%、4%和2.6%;增壓渦輪及動力渦輪的等熵效率是影響系統(tǒng)燃油經濟性的重要因素,提升等熵效率可降低廢氣能量回收過程中的泵氣損失;在試驗轉速且負荷為75%工況下,隨著等熵效率的提升,比油耗可在實測綜合油耗的基礎上進一步降低,最大降幅為4.1%,若考慮產、用能平衡策略,則該工況下比油耗可降至180.8g/(kW·h)。所提產、用能方案及分析方法可為基于余熱回收技術開展的發(fā)動機節(jié)能減排研究提供參考。
[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.
【作者單位】： 天津大學機械學院;
【基金】：國家重點基礎研究發(fā)展計劃資助項目(2011CB707206)
【分類號】：TK42;TM617

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