900mw 超临界塔式锅炉的技术特点

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1、维普资讯http://www.cqvip.com第26卷第J期动力工程V01．26No．12006年2月JournalofPowerEngineeringFeb．2【x)6文章编号：1000—6761(2006)01015—07900MW超临界塔式锅炉的技术特点冯伟忠(上海外高桥第三发电有限责任公司，上海200137)摘要：介绍了外高桥电厂二期900MW超临界塔式锅炉的基本情况。锅炉采用水平布置的对流受热面及螺旋水冷壁，能减少水冷壁的面积且受热均匀，可进行过热器及再热器的酸洗甚至取消冲管，有利于解决固体颗粒侵蚀(S

2、PE)问题，对流受热面传热均匀且具有较高的传热利用系数和材料安全裕度，具有相当低的对流受热面磨损率和较低的烟风系统阻力，尤其是辐射(蒸发)和对流受热面比例的任意性，特别有利于高效超临界技术的发展。锅炉采用燃烧器分组，双一次风喷嘴和设置偏置风和燃尽风等技术，降低了燃烧中心温度峰值和NO的生成，在降低燃烧区域热负荷的同时却提高了整个辐射受热面的平均热负荷，降低了水冷壁及炉膛出口的结焦风险。图6参14关键词：动力机械工程；超临界参数；塔式锅炉；螺旋水冷壁；燃烧器中图分类号：TK229．2文献标识码：AA900MWSupe

3、rcriticalTowerBoiler’STechnicalCharacteristicsFENGWei-zhong(ShanghaiWaigaoqiaoNo．3PowerGenerationCo．Ltd，Shanghai200137，China)Abstract：ThemainnotablepointsoftheWaigaoqiaoPowerPlant’Ssecondconstructionstage’S900MWsupercriticalboilerisbeingdescribed．Thehorizontal

4、layoutoftheboiler’Sconvectionheatingsurfaceandthespirallyshapedwaterwallreducestherequiredwaterwallareaandhelpstopromotethelatter’Sheattransfer，makesacidcleaningofthesuperheaterandreheaterpossible，andsteamflushingmayevenbedispensedwith，isadvantageousforsolving

5、thesolidpartMkeerosionproblem，evenstheheattransferdistributionovertheconvectionheatdeliverysurface，withahigherheatutilizationcoeficientandalargermarginofsafetyofthemateria1．Theerosionrateoftheconvectionheatdeliverysurfaceislower，aswellastheflowresistanceofthea

6、irfeedingandfluegassystem．Especiallynolimitissettotheratioofradiationtoconvectionheatdeliverysurface，whsichisadvantageoustothefurtherdevelopmentofhighefficientsupercriticaltechnology．Theboiler’Sgrouparrangedburners，thedualprimaryairnozzles，thesegregateddensean

7、dsparsezone，theapportionmentofoffsetairandburnoutair，allhelptolowerthetemperatureatthecenterofcombustionandtheformationofNOx，aswellas，simultaneouslywithloweringthethermalloadinthecombustisonzone，raisesthemeantermalloadoftheradiationheatdeliverysurfaceandlower，

8、theriskofcokingofthewaterwallandthefurnace’Soutlet．Figs6andrefs14．Keywords：powerandmechanicalengineering；supercriticalparameters；towertypeboiler；spiralshapedwaterwall；bllme,r外高桥电厂二