配风方式对层燃炉燃烧特性影响的试验研究.pdf 全文免费在线阅读

  本文关键词：配风方式对层燃炉燃烧特性影响的试验研究，，由笔耕文化传播整理发布。

网友gd433近日为您收集整理了关于配风方式对层燃炉燃烧特性影响的试验研究的文档，希望对您的工作和学习有所帮助。以下是文档介绍：上海交通大学硕士学位论文配风方式对层燃炉燃烧特性影响的试验研究姓名:常兵申请学位级别:硕士专业:热能工程指导教师:虞亚辉;罗永浩20070225上海交通大学硕士学位论文I配风方式对层燃炉燃烧特性影响的试验研究摘 要我国大部分的层燃锅炉长期处于热效率低下、污染物排放严重的运行状态,已经成为国家近年来要重点治理的高能耗设备。配风的研究对层燃炉提高效率具有举足轻重的意义。本文以一台链条炉为例进行了实炉试验,并通过单元体炉试验台研究不同煤种的配风特性,再辅以数值模拟,主要针对以下三个问题开展研究:首先是横向配风均匀性问题:通过实炉冷态配风试验,结合数值模拟和热态运行测试,发现了配风系统存在的问题,为风室的改造提出了可行性建议。其次是纵向配风对燃烧特性的影响:在实炉上进行了均匀配风、尽早配风和推迟配风三个工况的试验,得到了煤层表面的H2、O2、CH4、CO、CO2等气体成分以及温度沿炉排长度方向变化的规律;然后用时间模拟空间的方法,采用单元体炉试验台研究动力#2煤和神木煤在不同配风方式下的燃烧特性。最后是纵向配风对NOx生成的影响:在实炉上对尾部烟气中的NOx成分进行测量,得到了不同配风方式下的NOx生成规律。上海交通大学硕士学位论文II试验结果表明,针对此台链条炉,在较高负荷下,采用推迟配风方式,再结合特定的“双人字型”炉拱,可以达到提高锅炉效率、降低NOx排放的较好效果。关键词:配风方式,层燃炉,燃烧特性,单元体炉,NOx上海交通大学硕士学位论文IIIEXPERIMENTAL STUDY OF THE INFLUENCE ON BUSTION CHARICTERISTICS IN THE STOKER BOILER BY AIR DISTRIBUTION MODES ABSTRACT Most of the stoker boilers in China are operated under low efficiency situation and release a great deal of pollutants, so they have already been the high energy-consumption facilities that our country intends to bring under control in recent years. Research of air distribution modes plays an important role in increasing the efficiency of stoker boilers. Taking a chain grate stoker for example, experiments are carried out on this stoker and unit furnace, together with numerical simulation, in order to research air distribution characteristics for different coal types. Three problems are studied as follows. The first problem is related to transverse air flow distribution. Through cold test of air distribution on the stoker bined with numerical simulation and hot operation test, problems of air system are found. And feasible suggestions are put forward for the modification of wind box. 上海交通大学硕士学位论文IVThe second problem is concerning the influence on bustion characteristics by longitudinal air distribution. Three experiments are conducted on the chain grate stoker under uniform, front-enhanced and rear-enhanced modes. And the laws of H2、O2、CH4、CO、CO2 and temperature along the length of grate are obtained. Then, the method of time simulating space is adopted in order to study bustion characteristics of dongli #2and shenmu coal under different air distribution modes in the unit furnace. The last one is the influence on the generation of NOx by longitudinal air distribution. The amount of NOx in tail flue gas of the chain grate stoker is measured and the generation law of NOx under different air distribution modes is attained. The results show that for this stoker boiler, when operated under high load, rear-enhanced air distribution mode can increase the boiler efficiency and decrease NOx bined with double herringbone arch. KEY WORDS: air distribution mode, stoker boiler, combustion characteristics, unit furnace, NOx上海交通大学硕士学位论文VII主要符号说明符号定义α过剩空气系数2q排烟热损失(%)3q化学不完全燃烧热损失(%)4q机械不完全燃烧热损失(%)5q散热损失(%)6q灰渣物理热损失(%)pη炉排横向配风不均匀系数0kV理论空气量(Nm3/kg)L 链条炉排移动距离(m)v炉排移动的平均速度(m/s)t 时间(s)T 热力学温度(K)下标定义i 通用变量j 通用变量max 最大值min 最小值上海交通大学学位论文原创性声明本人郑重声明:所呈交的学位论文,是本人

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  本文关键词：配风方式对层燃炉燃烧特性影响的试验研究，由笔耕文化传播整理发布。