摘要
240t/h燃高焦炉混合煤气锅炉设计：（Q低温=1400千卡/标m3)，设计的参数为215℃的给水温度，540℃的过热蒸汽温度,140℃的排烟温度，20℃的环境温度。
本次设计计算了，炉膛，屏式过热器，高温过热器，低温过热器，高温省煤器，高温空气预热器，低温省煤器，低温空气预热器的结构计算和传热计算。以及对烟道阻力的计算和空气预热器的计算，引风机，送风机的选择。
炉膛宽度取7.7米，顶棚宽4。675米，顶棚高4.2米，炉膛总高15。785米。屏式过热器取8片，纵向排数27，每片屏并联管子根数为12,第一根屏管高度4。2米，屏高度最大值4.559米，屏的深度为1。244米。高温过热器横向管排数62,纵向管排数8,管长3。329，管簇深度0.76米。低温过热器横向管排数58，纵向管排数16，管长3.2.高温省煤器横向排数97。5，纵向排数26，受热面布置管长6.2。高温空预器横向管排数100，纵向管排数50，管箱高度1.44米.低温省煤器横向排数97.5，纵向排数64,受热面布置管长3。35米。低温空预器横向管排数100，纵向管排数50，管箱高度1。44米.
本次设计中，烟气在炉膛出口温度是1295.1℃,经过屏式过热器烟温下降至1183℃，在经过高温过热器烟温下降到1032。6℃，经低温过热器温度下降到832。54℃，经高温省煤器下降到449℃，经高温空气预热器降至382℃，经低温省煤器下降到222℃,经高温空气预热器降至146.7℃排烟。
本次设计中，水的流程是215℃给水经低温省煤器加热到260℃，经高温省煤器加热到319。97℃，进入汽包，再经下降管，由水冷壁使饱和水变成319.97℃的水蒸气，经低温过热器将水蒸气加热到425.2℃，经屏将水蒸气加热到455.87℃,最后经高温过热器加热到540℃引出做功。
关键字:炉膛，过热器，省煤器，空气预热器.
Abstract
240t / h burning blast furnace gas boiler design (high mixing coke oven gas：low—temperature Q = 1400 kcal / standard m3）of the graduation project, the design parameters for the feed water temperature of 215 °C, the superheated steam temperature of 540 °C，140 °C exhaustsmoke temperature, 20 °C ambient temperature。
The design, furnace，screen superheater，superheater high temperature, low temperature superheater, high-temperature economizer, high temperature air preheater，low-temperature economizer, low temperature air preheater of structural calculations and heat transfer calculations. And calculation of flue resistance and air preheater calculation of induced draft fan, blower options。
Take chamber width 7。7 meters，the ceiling is 4。675 meters wide, 4.2 meters high ceiling hearth，total 15.785 metres high。Take platen superheater of 8，longitudinal row number 27，every piece of screen the number of 12 parallel tubes，the first root screen pipe height 4。2 meters，screen the maximum height 4.559 meters, the depth of the screen is 1。244 meters。High temperature superheater tube transverse number 62, vertical tube number 8, length 3。329，the depth of 0.76 meters. Low temperature superheater tube for 58 horizontal，vertical tube number 16, length 3。2。High temperature economizer horizontal row number 97.5，longitudinal row number 26，decorate in heating length 6。2。High temperature air preheater horizontal tube number 100，vertical tube number 50, the box height 1。44 meters. Of low temperature economizer horizontal row number 97。5，longitudinal row number 64，decorate in heating tube 3。35 meters. Low temperature air preheater horizontal tube number 100, vertical tube number 50, the box height 1。44 meters.
In this design，the flue gas outlet temperature in the furnace is 1295。1 ° C, after the platen superheater flue gas temperature dropped to 1183 °C after the high temperature superheater flue gas temperature down to 1032。6° C, low temperature air
