过热器欠温、再热器超温分析及改造详解.doc

1175t/h锅炉再热器超温及改造1m；低温过热器加一圈立式管等措施，有效解决了2号炉过热器欠温和再热器超温的问题。 关键词： 锅炉；过热器；再热器；欠温；超温；改造etrofit of Superheater Oweheating and Reheater Overheating in 1175t/h Boiler Liu Jin,Ding Shi-fa (Shanghai Power Equipment Research Institute,Shanghai 200240,China) Abstract: Guohua Sanhe Power Generation Co., Ltd. No. 2 furnace design of coal for the Shanxi Province, the official production using mixed Shenhua coal. As the lack of superheater heating surface, superheater steam temperature is low, the burner can only be upward swing,resulting in increased residual rotation furnace outlet,the flue gas flow, the flue gas temperature and steam temperature deviations are increased, reheater metal temperature easily over-temperature, increased reduce temperature water. Combination of text superheater due to temperature and reheater overtemperature analysis of the status, proposed solutions. Scene reconstruction results show that: the implementation of the platen superheater downward extended 1m; low temperature superheater tubes and other measures to increase vertical circle, an effective solution to the No. 2 boiler superheater due to temperature and reheater overtemperature problems. Key Words: boiler；superheater；reheater；owetemperature；overtemperature；retrofit 三河电厂2号锅炉是三菱350MW IX亚临界强制循环锅炉，额定蒸发量为1175t/h，主、再热蒸汽温度541/541℃、压力17.26/4.24MPa。锅炉采用固态排渣、平衡通风、直吹式制粉系统，每台炉配备四台双进双出钢球磨煤机。该锅炉燃烧器布置于炉膛四角，切圆燃烧，整组燃烧器为一、二次风间隔布置，顶部布置了AA风，燃烧器整组摆动。2000年4月投入商业运行，性能试验采用设计煤种晋北烟煤，调试和正式生产均采用神华掺烧煤（神华准葛尔掺烧比例7：31 2号炉受热面布置示意图 表1 设计煤种和运行煤种煤质分析 煤质项目 符 号 单 位 设计煤种 神华准葛尔掺烧比例7：3Car ％ 58.56 62.31 Har ％ 3.36 3.59 Oar ％ 7.28 10.05 Nar ％ 0.79 0.86 St,ar ％ 0.63 0.42 Aar ％ 19.77 8.87 Mar ％ 9.61 13.91 Var ％ 22.82 28.53 Qnet,ar kJ/kg 22441 23513 水分(空气干燥基) Mad ％ 2.85 8.56 Vdaf ％ 32.31 36.97 FCar ％ 47.8 48.69 7：3ECR 75%ECR 100%ECR 75%ECR 主汽流量 t/h 1052.3 777.5 1044 777 再热汽流量 t/h 850.7 638.7 841 639 省煤器入口流量 t/h 978.8 680.6 1044 777 过热器喷水 t/h 73.5 96.9 0 0 再热器喷水 t/h 0.0 0.0 53 22 省煤器入口压力 MPa 18.49 17.04 18.8 17.3