废液燃烧器燃烧数值模拟研究
发布时间：2018-07-28 13:00
【摘要】：随着我国工业化进程加快,每年有机废液的排放量也急剧上升,每年都会产生数以万吨计的有机废液,严重威胁着生态环境。燃烧法因其方便、无害化处理效率高,同时还可以增设余热锅炉回收废液焚烧的烟气热量,降低处理成本,是工程上处理废液比较常用的方法。本文以某企业废液燃烧器为对象,运用商业流体计算软件FLUENT进行数值模拟,研究废液在炉内流动和燃烧过程,为燃烧器的设计与优化改造提供依据。首先根据燃烧器的结构建立有旋流器和无旋流器两种几何模型,并进行网格划分。在只有空气和燃气喷入炉膛的条件下,分别对炉内冷态和热态流场进行计算,考察了燃烧器的结构优势。随后对燃料进行调整,模拟燃气在炉内的燃烧,并在此基础上将废液作为二次燃料流喷射进入炉膛,计算炉内温度场、速度场以及燃烧产物分布,通过结果对废液在炉内的燃烧特性有了详细的了解。结果表明,燃烧器的结构对炉膛内的流场以及燃料空气混合程度的促进作用,在旋流器的作用下,气流扰动剧烈,形成回流区,燃气和废液雾滴被回流区的高温烟气卷吸,迅速干燥后着火；炉膛内火焰具有良好的对称性且刚性较强,火焰高温区狭长。由于空气量过多以及废液含水量高,炉膛内温度梯度明显而且氧含量较高,燃料燃烧比较充分而且降低了NO的生成量,结果表明,燃烧器结构非常适合废液在炉内的高温区快速、稳定燃烧。
[Abstract]:With the acceleration of industrialization in our country, the emission of organic waste liquor increases sharply every year, and tens of thousands of tons of organic waste liquid is produced every year, which seriously threatens the ecological environment. Because of its convenience and high efficiency of innocuous treatment, the combustion method can also add waste heat boiler to recover the heat of flue gas incinerated from waste liquid and reduce the cost of treatment. It is a common method to treat waste liquid in engineering. In this paper, a commercial fluid calculation software FLUENT is used to simulate the flow and combustion process of waste liquid burner in a certain enterprise, which provides the basis for the design and optimization of burner. Firstly, according to the structure of the burner, two kinds of geometric models, hydrocyclone and non-cyclone, are established and meshed. Under the condition that only air and gas are injected into the furnace, the cold and hot flow fields in the furnace are calculated, and the structural advantages of the burner are investigated. Then the fuel is adjusted to simulate the combustion of the gas in the furnace. On this basis, the waste liquid is injected into the furnace as a secondary fuel flow to calculate the temperature field, velocity field and the distribution of combustion products in the furnace. Through the results, the combustion characteristics of waste liquid in the furnace are understood in detail. The results show that the structure of the burner promotes the flow field in the furnace and the mixing degree of the fuel and air. Under the action of the cyclone, the air flow is disturbed violently, and the reflux zone is formed, and the gas and liquid droplets are entrapped by the high temperature flue gas in the reflux zone. The flame in the furnace has good symmetry and rigidity, and the flame is narrow and narrow at high temperature. Because of excessive air volume and high water content of waste liquid, the temperature gradient in furnace is obvious and the oxygen content is high, the fuel combustion is sufficient and the no production is reduced, the results show that, The burner structure is very suitable for fast and stable combustion of waste liquid in high temperature region of furnace.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703.3
本文编号：2150225
[Abstract]:With the acceleration of industrialization in our country, the emission of organic waste liquor increases sharply every year, and tens of thousands of tons of organic waste liquid is produced every year, which seriously threatens the ecological environment. Because of its convenience and high efficiency of innocuous treatment, the combustion method can also add waste heat boiler to recover the heat of flue gas incinerated from waste liquid and reduce the cost of treatment. It is a common method to treat waste liquid in engineering. In this paper, a commercial fluid calculation software FLUENT is used to simulate the flow and combustion process of waste liquid burner in a certain enterprise, which provides the basis for the design and optimization of burner. Firstly, according to the structure of the burner, two kinds of geometric models, hydrocyclone and non-cyclone, are established and meshed. Under the condition that only air and gas are injected into the furnace, the cold and hot flow fields in the furnace are calculated, and the structural advantages of the burner are investigated. Then the fuel is adjusted to simulate the combustion of the gas in the furnace. On this basis, the waste liquid is injected into the furnace as a secondary fuel flow to calculate the temperature field, velocity field and the distribution of combustion products in the furnace. Through the results, the combustion characteristics of waste liquid in the furnace are understood in detail. The results show that the structure of the burner promotes the flow field in the furnace and the mixing degree of the fuel and air. Under the action of the cyclone, the air flow is disturbed violently, and the reflux zone is formed, and the gas and liquid droplets are entrapped by the high temperature flue gas in the reflux zone. The flame in the furnace has good symmetry and rigidity, and the flame is narrow and narrow at high temperature. Because of excessive air volume and high water content of waste liquid, the temperature gradient in furnace is obvious and the oxygen content is high, the fuel combustion is sufficient and the no production is reduced, the results show that, The burner structure is very suitable for fast and stable combustion of waste liquid in high temperature region of furnace.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703.3
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