微型燃烧器燃烧特性优化及数值模拟
发布时间：2018-08-21 13:42
【摘要】：微型燃烧器是微型热光电(MTPV)系统的重要组成部分，整个MTPV系统的动力输出主要来自于光电池吸收的微型燃烧器外壁面高温辐射出的辐射能，其好坏取决于微型燃烧器热转换效率的高低。微型燃烧器是以自然界分布广泛的烃类化合物为燃料，具有结构简单、单位体积能量大、能量转换效率高等优点。 研究工作针对微型燃烧器在各影响因素下的工作性能，通过改变多孔介质的结构、孔隙率、混合气的流量以及混合比等方法对燃烧器辐射壁面的温度分布和光谱性能进行测量和分析。通过试验得出泡沫陶瓷多孔介质在微型燃烧器内的燃烧效果要优于陶瓷小球多孔介质，多孔介质孔隙率过大或过小都不利于燃烧的发生。混合气流量的增加在一定程度上增强了微型燃烧器壁面的温度。 为了分析研究微型燃烧器烟气中HC和CO的含量，使其能够满足污染物排放的相关要求，在微型燃烧器的出口处添加了烟气采集系统，针对不同流量、不同孔隙率、不同混合比等工况下烟气中的HC和CO的含量进了采集和分析，，寻找出既能满足高转换效率又能满足低污染物排放的燃烧器工作工况。微燃烧器烟气中有害成分HC和CO的含量都与微型燃烧器燃烧状态有关，随着混合气流量的增加HC和CO的含量均呈现先降低后增加的趋势，孔隙率的变化对两者的影响相对复杂。 由于试验设备的限制，很多工况在试验台架上无法进行试验，微型燃烧器的内部燃烧状态以及各成分浓度分布情况也无法进行测量，为了能够分析这些因素对微型燃烧器工作状态的影响，利用CFD计算模拟的方法。通过Fluent软件建立合理的微型燃烧器物理模型，模拟出微型燃烧器在较多工况下的工作状态以及内部燃烧反应的情况。与试验结果相结合，全面分析各因素对微型燃烧器工作状态的影响，取得了较好的效果，为将来微型热光电系统的研究指明了方向。
[Abstract]:The micro burner is an important part of the micro thermoelectric (MTPV) system. The power output of the whole MTPV system comes mainly from the radiation energy emitted from the external wall of the micro burner absorbed by the photocell. Its quality depends on the heat conversion efficiency of the micro burner. The micro burner is based on hydrocarbon compounds which are widely distributed in nature. It has the advantages of simple structure, large unit volume energy and high energy conversion efficiency. By changing the structure and porosity of porous media, the study aims at the performance of micro burners under various influence factors. The temperature distribution and spectral properties of the radiating wall of the burner were measured and analyzed by the mixture flow rate and mixing ratio. The experimental results show that the combustion effect of porous media in micro burners is better than that in porous media with ceramic pellets. The porosity of porous media is too large or too small is not conducive to combustion. To some extent, the temperature of the wall of the micro burner is increased with the increase of the mixture flow rate. In order to analyze the content of HC and CO in the flue gas of micro burners so as to meet the requirements of pollutant emission, a flue gas acquisition system was added at the outlet of the micro burners, aiming at different flow rates and different porosity. The contents of HC and CO in flue gas under different mixing ratios were collected and analyzed to find out a burner that can meet both high conversion efficiency and low pollutant emission. The contents of HC and CO in micro combustor flue gas are all related to the combustion state of micro burner. With the increase of mixture flow rate, HC and CO content both decrease first and then increase, and the effect of porosity on them is relatively complex. Because of the limitation of the test equipment, many working conditions can not be tested on the test bench, and the combustion state and the distribution of the components in the micro burner can not be measured. In order to analyze the influence of these factors on the working state of the micro burner, the simulation method of CFD is used. A reasonable physical model of micro burner is established by Fluent software, and the working state and internal combustion reaction of micro burner under more working conditions are simulated. Combined with the experimental results, the influence of various factors on the working state of the micro burner is comprehensively analyzed, and good results are obtained, which points out the direction for the future study of the micro thermoelectric system.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM914.4
本文编号：2195915
[Abstract]:The micro burner is an important part of the micro thermoelectric (MTPV) system. The power output of the whole MTPV system comes mainly from the radiation energy emitted from the external wall of the micro burner absorbed by the photocell. Its quality depends on the heat conversion efficiency of the micro burner. The micro burner is based on hydrocarbon compounds which are widely distributed in nature. It has the advantages of simple structure, large unit volume energy and high energy conversion efficiency. By changing the structure and porosity of porous media, the study aims at the performance of micro burners under various influence factors. The temperature distribution and spectral properties of the radiating wall of the burner were measured and analyzed by the mixture flow rate and mixing ratio. The experimental results show that the combustion effect of porous media in micro burners is better than that in porous media with ceramic pellets. The porosity of porous media is too large or too small is not conducive to combustion. To some extent, the temperature of the wall of the micro burner is increased with the increase of the mixture flow rate. In order to analyze the content of HC and CO in the flue gas of micro burners so as to meet the requirements of pollutant emission, a flue gas acquisition system was added at the outlet of the micro burners, aiming at different flow rates and different porosity. The contents of HC and CO in flue gas under different mixing ratios were collected and analyzed to find out a burner that can meet both high conversion efficiency and low pollutant emission. The contents of HC and CO in micro combustor flue gas are all related to the combustion state of micro burner. With the increase of mixture flow rate, HC and CO content both decrease first and then increase, and the effect of porosity on them is relatively complex. Because of the limitation of the test equipment, many working conditions can not be tested on the test bench, and the combustion state and the distribution of the components in the micro burner can not be measured. In order to analyze the influence of these factors on the working state of the micro burner, the simulation method of CFD is used. A reasonable physical model of micro burner is established by Fluent software, and the working state and internal combustion reaction of micro burner under more working conditions are simulated. Combined with the experimental results, the influence of various factors on the working state of the micro burner is comprehensively analyzed, and good results are obtained, which points out the direction for the future study of the micro thermoelectric system.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM914.4
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