京江学院JINGJIANGCOLLEGEOFJIANGSUUNIVERSITY本科毕业设计29MW热水锅炉烟风阻力计算Thecalculationofsmokewindresistancein29MWhotwaterboiler学生学号:学生姓名:专业班级:J动力热能1002指导教师姓名:指导教师职称:副教授2014年6月I29MW热水锅炉烟风阻力计算专业班级:J动力热能1002学生姓名指导老师:职称:副教授摘要热水锅炉在人们的日常生活中是不可缺少的热力设备,将煤,石油等燃料的化学能燃烧释放的热量传给水,加热后的热水直接供给工业生产和民用生活使用。本次毕业设计任务是29MW热水锅炉烟风阻力计算。锅炉烟风阻力计算是在热力计算的基础上,通过对烟气和空气通道的空气动力学计算,求解通道的流动总阻力,从而为选择合适的引、送风机提供基础数据。烟风系统各部分介质流量、温度以及流通截面等相关数据均根据锅炉结构尺寸及额定负荷下热力计算数据确定。烟风阻力计算包括烟气侧阻力的计算,引风机的选择,空气侧阻力的计算及鼓风机的选择。关键词:热水锅炉,引风机,鼓风机,烟风阻力计算IIThecalculationofsmokewindresistancein29MWhotwaterboilerAbstractHotwaterboilerisindispensableheatingequipmentinPeople'sDailylives.Thecombustionofcoal,oilandotherfuelisusedtoreleasedtheheattothewater.Thehotwaterheatedsupplytotheuseofindustrialproductionandcivillifedirectly.Thisgraduationdesignofthecalculationofsmokewindresistancein29MWhotwaterboilerisconducted.Thecalculationofsmokewindresistanceinhotwaterboilerisonthebasisofthermodynamiccalculation,throughaerodynamiccalculationoffluegasandairchannels,tosolvetheflowchanneloftotalresistanceandtoprovidebasicdatatochoosetheappropriateguideblower.Eachpartofthemediumflowrate,temperatureandflowareaandotherrelateddataarebasedontheboilerthermodynamiccalculationdataofmeasurementundertheratedloadinthesmokewindsystem.Thecalculationofsmokewindresistanceincludingthecalculationoffluegasresistanceaddtotheselectionoftheinduceddraftfan,thecalculationofairresistanceandtheselectionoftheblower.Keywords:hotwaterboiler,induceddraftfan,blower,thecalculationofsmokewindresistance目录第1章绪论.............................................................................................................................11.1锅炉的应用现状及其在社会生活中的重要性...............................................11.1.1锅炉的发展.............................................................................................11.1.2锅炉的工作过程.....................................................................................21.1.3锅炉在社会生活中的应用现状.............................................................31.2热水锅炉...........................................................................................................31.2.1锅炉分类.................................................................................................31.2.2热水锅炉现状.........................................................................................51.2.3热水锅炉举例.........................................................................................61.2.4烟风阻力计算的重要性.........................................................................91.2.5烟风阻力计算设计优化和改进...........................................................101.3烟风阻力计算步骤.........................................................................................101.3.1烟气侧阻力计算及引风机的选型......................................................101.3.2空气侧阻力计算及鼓风机的选型.......................................................11第2章烟气侧阻力计算................................................................................................122.1炉膛出口负压及八字烟道阻力.....................................................................132.1.1纵向、横向相对截距...........................................................................132.1.2斜向节距...............................................................................................132.1.3单排管子阻力系数ξ10..........................................................................132.1.4八字烟道阻力系数...............................................................................142.1.5烟气动压头...........................................................................................152.2前烟道箱阻力.................................................................................................162.2.1局部阻力系数及有效截面积...............................................................162.2.2前烟箱烟气速度...................................................................................172.2.3前烟箱局部阻力...................................................................................172.3螺纹烟管阻力.................................................................................................182.3.1动压头...................................................................................................182.3.2入口、出口阻力系数...........................................................................182.3.3螺纹烟管阻力.......................................................................................182.4后烟箱阻力.....................................................................................................192.4.1后烟箱出口阻力系数和后烟箱截面变化阻力系数...........................192.4.2动压头...................................................................................................192.4.3后烟箱与省煤器之间的阻力...............................................................202.5后烟箱与除尘器与烟囱之间的烟道阻力.....................................................202.6除尘器阻力.....................................................................................................202.7烟囱阻力.........................................................................................................202.7.1烟气动压头.............................