游泳池燃气锅炉房设计+CAD图纸(7)_毕业论文

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游泳池燃气锅炉房设计+CAD图纸(7)


 = +( -1)                          (3-3)
式中: 对应省煤器进口烟温为350℃的理论烟焓,kJ/kg
进口: =     +     +    
                      =1.13 665.5+8.86 459.5+2.21 544.5
                      =6026.53 kJ/kg
 =    =10.18 472.5=4810.05 kJ/kg
 =6026.53+(1.1-1)  4810.05=6507.535kJ/kg
出口: = +( -1)     查焓温表3.3(本论文)
得  =2769.52 kJ/kg
3.2.3 烟气侧放热量
                             =φ( - +  )                        (3-4)
                      其中:  =                                  (3-5)
                      ∴ =0.984 (6026.53-2769.52+0.10 397.47)
                            =3244.01kJ/kg
3.2.4 省煤器中介质吸热量
 与烟气侧放热量相同,∴ =  =3244.01kJ/kg
3.2.5 省煤器介质出口焓和出口温度
由 =  ( - )/                       (3-6)
得 =  / +                       (3-7)
                             =3244.01 215.23/(70418 1.05)+70
                             =85.39kJ/kg
式中 = =70 kJ/kg
省煤器的出口温度近似与出口焓相等 = =85.39℃
3.2.6 省煤器所需传热面积计算
(1) 传热温差  
流经省煤器的烟气从上而下,水流自下而上,呈逆流式布置,
 =( - )/㏑( / )                 (3-8)
                       =[(350-72.26)-(150-70)]/㏑[(350-72.26)/ (150-70)]
                       =176.14℃
(2) 烟气流速
选用φ76方型铸铁鳞片省煤器,每根长2.0m烟道流通截面积0.12m2,受热面面积2.95 m2,烟气平均温度; =( + )/2=(350+150)/2=250℃
若初选省煤器为50根,以横5纵10布置,则
烟气流速 =   ( +273)/(273 F 3600)                (3-9)
                       =215.23 12.41  (265+273) / (273 3600 0.12)    (责任编辑:qin)