抗氧化剂对生物柴油排放的影响  

Effect of antioxidants on emission of biodiesel

作　　者：王忠[1] 吴婧[1] 毛功平[1] 瞿磊[1] 王飞[1] 胡慧慧[1] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013

出　　处：《农业工程学报》2014年第24期266-271,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然基金(51376083);江苏省高校自然科学基金重点项目(13KJA470001);江苏高校优势学科建设工程资助项目PAPD(2011年);江苏省2013年度普通高校研究生科研创新计划项目(CXZZ13_0672);江苏省2014年度普通高校研究生科研创新计划项目(KYLX_1035)

摘　　要：通过添抗氧化剂改变生物柴油的酸值与过氧化值,提高生物柴油的氧化安定性。该研究选择迷迭香(K1)和茶多酚(K2)2种抗氧化剂添加到生物柴油与柴油形成的调合油(B20)中,在186F柴油机上进行排放特性试验。考察了标定转速3 000 r/min,10%、25%、50%、75%和100%负荷工况时,抗氧化剂对HC、CO、碳烟和NOx排放的影响。研究表明:与柴油相比,燃用B20调合油HC、CO排放和烟度值大幅降低,NOx排放增加;与B20调合油相比,燃用添加抗氧化剂(迷迭香和茶多酚)的K1B20和K2B20在各工况下生成的HC、CO排放和烟度值的平均值分别升高了1.2%、10.2%、8.5%和6.4%、3.8%、4.3%,NOx排放分别比B20降低了9.5%和4.2%。添加抗氧化剂可以有效降低生物柴油的NOx排放。Biodiesel is a clean-burning alternative fuel produced from renewable resources, such as vegetable oils or animal fats. Therefore, biodiesels are becoming increasingly important due to their ease in adaptation. Biodiesel also contributes to slowing up the depletion of fossil resources and reducing the emissions from the transport sector, both environmental benefits and prospect in energy security. Biodiesels with higher unsaturated esters content with a higher tendency to lose stability through degradation are susceptible to oxidative degradation due to autoxidation in the presence of oxygen. Antioxidant addition is a prospective solution to the problem of improving the oxidation stability of biodiesel. Biodiesel contains a lot of unsaturated fats monoester, which will generate short chain alkenes, alkynes under high temperature cracking reaction. The concentration of H has a great influence on the decomposition path of unsaturated fat monoester and the breakdown products in the process of reaction. The mechanism of adding antioxidant includes that H is supplied by the phenol hydroxyl（OH） end the transmission of free radical chain reaction. Also the phenol hydroxyl-supplied H promotes the reduction reaction and inhibits oxidation reaction. As a result, addition of antioxidants to biodiesel could promote the reductive reactions and inhibit the oxidative reactions, which could increase the emission of soot, HC and CO but decrease NOX emission.The aim of the present study is to investigate engine performance and the exhaust emissions of a diesel engine using oxidative stabilized biodiesel. The biodiesel fuel used in the study was prepared from waste edible oils. It＇s an experimental investigation of the effect of antioxidant addition to biodiesel on emission characteristics. In this experiment, mark rosemary and tea polyphenol as K1 and K2. Add 8‰ of K1 and K2 into the diesel blend（B20） respectively, and mark the 2 kinds of blending fuel as K1B20 and K2B20. Test the emission characteristics of 4 kinds of

关 键 词：生物柴油 柴油机 排放控制 抗氧化剂 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程] S216[农业科学—农业机械化工程]