【作者】 崔勇；

【导师】 张卫军；

【作者基本信息】 东北大学 ， 制冷及低温工程， 2009， 硕士

【摘要】 本文是在完成东北特钢集团大连基地二炼厂热处理车间台车式高速脉冲热处理炉设计工作的基础上,对台车式热处理炉设计中的关键技术问题进行了研究。(1)脉冲燃烧及其控制技术是脉冲燃烧热处理炉的技术核心。本文对燃烧系统点火、火焰监测、燃烧过程各参数监控、炉温自动控制及时序脉冲燃烧控制技术工作原理等内容进行了专项研究。给出了多种工况下,脉冲时序组成和控制策略。(2)本文以辐射喷流换热器为例,建立了辐射喷流换热器工作模型,分析了周期性工作条件下换热器的传热特性(空气预热温度、壁温、传热系数)随炉况的变化。给出了周期式炉上使用换热器时其经济换热面积的计算方法。并研究了辐射喷流换热器的结构参数对综合传热系数的影响。(3)运用流体动力学计算软件(CFD)Fluent,对采用高速脉冲燃烧的狭长炉膛的三维流场进行了数值模拟,分别获得了排烟口在炉尾、炉顶时的热处理炉内的气体压力的分布规律。通过对炉膛内的压力分布状况分析表明,对于采用脉冲燃烧的狭长炉子,炉顶排烟要比炉后排烟的压力分布均匀,炉顶多口排烟要比炉顶单口排烟更加有利。(4)变压吸附制氧装置的设计讨论作为本次项目的一个补充专题,介绍了变压吸附制氧装置中吸附器的内部结构、分流板、分子筛布局与装填方式、压料部件与装配等内容,对影响制氧机性能的因素进行了剖析和论述,探讨了变压吸附制氧机吸附床设计中关键影响因素和技巧。更多还原

【Abstract】 In this paper,we studied on key issues in the design of car-bottom Heat Treatment Furnace.To do all the work based on the design of trolley-style high-speed pulse heat treatment furnace,which belong to the second heat treatment workshop of the Northeastern Special Steel Group in Dalian refinery base.Combustion and its control are the key technology for various flaming furnaces.The author piont out that a highly capable combustion system shall be able to control the complete combustion process and a probe has been made into various aspects such as flame ignition,flame monitoring,air/fuel ratio control, monitoring of various paramenters in the combustion process and furnace automatic temperature control.The author Emphatically compared the advantages of the pulse combustion to the continuous combustion,and to compare the advantages and disadvantages of different pulse combustion systems.In heating process of the cycle-type furnace,flue gas temperature, heat-exchaning cofficient of exchanger and air-preheating temperature changed continually,so we must calculate heat-exchaning area regarding the whole heating process as object.The calculation model for radiation-jet recuperator has been established and the thermal transmission characteristics(preheating temperature of air,temperature of furnace wall and thermd transmission coefficient)of the radiation-jet recuperator for car—type heat treating furnace has been therefore analyzed.Here we took radiation-jet exchanger for eaxample and show the calculation of economical heat-exchanging area of exchanger used in cycle-type furnace.The effect of structural parameters on the heat transfer coefficient of radiation-jet recuperator had been studied.A commercial compultational fluid dynamics(CFD) software package,fluent, was used to develop three-dimensional model of long-narrow furnace.The purpose was to gain knowledge of gas flow and velocity distribution in the furnace under three situations of smoke exhaust:exhausting flue gas from single hole in the back of furnace,exhausting flue gas from single hole in the top of furnace and exhausting flue gas from tow holes in the top of furnace.The study showed that the gas flow and velocity distribution of top smoke exhaust is more uniform than back smoke exhaust,single smoke exhaust hole is more uniform than two smoke exhaust holes.The inner structure of adsorber,flow distributor,arrangement and packing style of molecularsieve,impacting components of packing bed are introduced.The factors that have effects on the performance of oxygen generating system by pressure swing adsorption are analyzed and discussed,and some key skills and lessons are shared in the design of the oxygen generating equipment.更多还原