旋流燃烧器中浓淡气固两相流的数值模拟及实验研究
摘要
能源与环境是制约人类发展的重要问题,而锅炉作为能源行业应用最广泛的燃烧设备,其运行状态的良好是对经济效益和安全最基本的保障。燃烧器是锅炉取得高燃烧效率的主要设备。在过去的几十年里,许多科学家和工程技术人员都对这项领域进行了大量的研究,研发出了不同类型的燃烧器。其中浓淡燃烧器作为燃烧效率最高的燃烧器在能源行业得到了最广泛的应用。本文先通过数值模拟的方法来得到浓淡旋流燃烧器出口的气固相分布,并通过实验方法来进行对比研究。同时阐述了一种新型的测量方法(光学波动法)测量浓度和粒径分布的原理,并在试验条件下利用光学波动法对浓淡燃烧器的气固两相流动特性进行测量。
本文通过搭建冷模试验台架,研究一次风弯头以及不同挡板对燃烧器出口浓淡分布的影响。并在不同工况下对旋流燃烧器出口的气固两相流的扩散特性进行了研究。在试验中主要进行了以下工作：
按照冷态模化的基本原理对1：2的旋流燃烧器进行模化计算,确定了模化工况。通过Fluent软件对燃烧器出口的气相流场和气固相分布进行模拟。
按照要求搭建试验台架后,在一次风管道内使用滑石粉对管道中煤粉运动情况进行模拟。并通过在一次风弯头增加月牙形挡块和三角形挡块来研究弯头和挡块对燃烧器出口浓淡分布的影响。
按照冷态模化的原理对1：4的浓淡旋流燃烧器进行模化计算和试验台架设计,先在不带粉的情况下进行气相流场测量试验,使用毕托管和热线风速仪等得到了旋流燃烧器出口的回流区速度分布,为以后的气固两相研究奠定了基础。
通过试验台架的给粉循环系统,应用光学波动法对旋流燃烧器出口的气固两相流的浓淡分布及扩散特性进行测量,得到不同工况下燃烧器出口的浓度分布图,以此来分析不同工况下旋流燃烧器出口的气固两相的扩散特性。
Energy and environment are important issues of human development constraints, and as the most widely used combustion equipment of the energy industry, the well running boiler state is the guarantee for economic benefits and safety. Among the boiler equipments, burner is major equipment for high combustion efficiency. In the past few decades, many scientists and engineers have done a lot of research for this area and developed a different burner. And rich-lean burner as the most efficient burner in the energy industry has been most widely used. This article studies the gas-solid distribution of the outlet of rich-lean swirl burner firstly by numerical simulation method, compared with experimental method. The article also describes the principle of laser wave method, a new meaning method. A new measuring method: laser wave method, and then researches on the characteristics of gas-solid flow of rich-lean burner under the experimental conditions.
Through constructing cold model test bench, the text makes a research on the diffusion characteristics of the gas-solid distribution of the out let of swirl burner. In the experiment mainly for the following work:
1) In accordance with the principles of Cold Modeling, the 12 model of the swirl burner were designed modeling to determine the mode chemical conditions. Using fluent software the text simulates the gas phase flow field and the gas-solid distribution of the burner outlet.
2) After constructing the test bench as required, the experiment stimulates the movement of coal in the use of talc to the pipe in the primary air duct. At the same time, to study the influence of the elbow and the block on the concentration distribution of the burner outlet, the crescent block and the triangle block are added in the elbow of first wind.
3) According to the principles of Cold Modeling, the article modeling designs the 1:4 rich-lean swirl burner and plans the test bench, performs measurement of gas flow field test in the case without powder and gets the result of the speed of recirculation zone of the outlet of the whirl burner by the use of piton tube and hot wire anemometer., all of which lays the foundation for the future of gas-solid study.
4) Through the powder circulatory system set up by the test bench, the experiment measures the concentration distribution and diffusion characteristics of gas-solid distribution of the swirl burner outlet by the application of laser wave method, obtaining the chart of the concentration and size distribution of the burner outlet under different conditions. And then the article also analyses the diffusion characteristics of the gas-solid distribution of the whirl burner outer in the different situation.
本文通过搭建冷模试验台架,研究一次风弯头以及不同挡板对燃烧器出口浓淡分布的影响。并在不同工况下对旋流燃烧器出口的气固两相流的扩散特性进行了研究。在试验中主要进行了以下工作：
按照冷态模化的基本原理对1：2的旋流燃烧器进行模化计算,确定了模化工况。通过Fluent软件对燃烧器出口的气相流场和气固相分布进行模拟。
按照要求搭建试验台架后,在一次风管道内使用滑石粉对管道中煤粉运动情况进行模拟。并通过在一次风弯头增加月牙形挡块和三角形挡块来研究弯头和挡块对燃烧器出口浓淡分布的影响。
按照冷态模化的原理对1：4的浓淡旋流燃烧器进行模化计算和试验台架设计,先在不带粉的情况下进行气相流场测量试验,使用毕托管和热线风速仪等得到了旋流燃烧器出口的回流区速度分布,为以后的气固两相研究奠定了基础。
通过试验台架的给粉循环系统,应用光学波动法对旋流燃烧器出口的气固两相流的浓淡分布及扩散特性进行测量,得到不同工况下燃烧器出口的浓度分布图,以此来分析不同工况下旋流燃烧器出口的气固两相的扩散特性。
Energy and environment are important issues of human development constraints, and as the most widely used combustion equipment of the energy industry, the well running boiler state is the guarantee for economic benefits and safety. Among the boiler equipments, burner is major equipment for high combustion efficiency. In the past few decades, many scientists and engineers have done a lot of research for this area and developed a different burner. And rich-lean burner as the most efficient burner in the energy industry has been most widely used. This article studies the gas-solid distribution of the outlet of rich-lean swirl burner firstly by numerical simulation method, compared with experimental method. The article also describes the principle of laser wave method, a new meaning method. A new measuring method: laser wave method, and then researches on the characteristics of gas-solid flow of rich-lean burner under the experimental conditions.
Through constructing cold model test bench, the text makes a research on the diffusion characteristics of the gas-solid distribution of the out let of swirl burner. In the experiment mainly for the following work:
1) In accordance with the principles of Cold Modeling, the 12 model of the swirl burner were designed modeling to determine the mode chemical conditions. Using fluent software the text simulates the gas phase flow field and the gas-solid distribution of the burner outlet.
2) After constructing the test bench as required, the experiment stimulates the movement of coal in the use of talc to the pipe in the primary air duct. At the same time, to study the influence of the elbow and the block on the concentration distribution of the burner outlet, the crescent block and the triangle block are added in the elbow of first wind.
3) According to the principles of Cold Modeling, the article modeling designs the 1:4 rich-lean swirl burner and plans the test bench, performs measurement of gas flow field test in the case without powder and gets the result of the speed of recirculation zone of the outlet of the whirl burner by the use of piton tube and hot wire anemometer., all of which lays the foundation for the future of gas-solid study.
4) Through the powder circulatory system set up by the test bench, the experiment measures the concentration distribution and diffusion characteristics of gas-solid distribution of the swirl burner outlet by the application of laser wave method, obtaining the chart of the concentration and size distribution of the burner outlet under different conditions. And then the article also analyses the diffusion characteristics of the gas-solid distribution of the whirl burner outer in the different situation.
引文
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[17]张朴、孔力,一种气动传输粉体质量测量方法[J],华中科技大学学报：自然科学版,20018(29),47-49
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[21]庄慧颖,旋流燃烧器与直流燃烧器的特点比较及发展前景[J],中国电力,19982(31),35-37
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