水煤浆再燃降低NOX排放的机理与试验研究

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1、浙江大学博士学位论文水煤浆再燃降低NOx排放的机理与试验研究姓名：董若凌申请学位级别：博士专业：工程热物理指导教师：岑可法;周俊虎20060401浙江大学博士学位论文摘要下降，C02和锅炉不完全燃烧损失的增加构成再燃技术的主要缺憾．不过，上述增加均在可接受范围内。冉燃的污染物控制能力可被拓展于减少CO和N20排放上，且作用规律与对NOx的控制效果一致，再燃技术具有多种污染物同步脱除潜力．本文实现了水煤浆再燃技术的应用验证和机理拓展，获得了作用规律和影响因素详情，可为水煤浆再燃进入工业实践环节提供参考。关键词：再燃技术，水煤浆，NOx，脱硝Ⅱr，，』_】lL，

2、ltr浙江大学博士学位论文摘要AbstractNOxreductionthroughreburnmgwasaneffectivepolluuoncontroltechnology．Itsefficiencyisrelativetothecharacteristicsofreburmgfuels．InordertoexploretheprobalityofNOxreducttonthroughcoalwaterslurry(cws)soastoexpanditsappliedranges．theinformattonaboutfuel-Ndistributio

3、ndurmgpyrolysis．reburmngkneticsanditsutilityrangesandreburningtechnologyfeaturesweregenerallystudiedhere．NitrogenvolatilizationandsurfaceareasincreasearereasonableexplanationsforCWS’highNOxreductionefficiency．Inthepyrolysisexperiment。CWS’char-NandNH3．Nfractionarclowerthanthecoals，w

4、hileTar-N，HCN—N。andN2．etcfractionsaregreater．Temperature，fuels，CWSconcentrationandresidencetimearefactorsinfluencingNvolatility．BETorDRsurfaceanalysistechnologyconfirmstheeffectofincreaseofbothspecificareaandmicrocellularstructureafterCWSmaking．Whenthermogravimetrywasusedtostudythe

5、heterogeneousreactionofNOreduction，theweighlossofsampleswithtemperaturerecordedtheCharreactionprocessdetailedly．Throughtests，itisfoundthatthereactionbetweenNOandCharhassectionedcharacteristics。thismayberelativetothemmeralsubstanceinthechar．Slurryingcanmakecoalcharmorereactive．Theki

6、neticdatashowthatactivationenergyofreactionatlowtemperatureoftenislowerthanthatathightemperature．WatercannotplayaroleinNOxreductionalone．OwningtheNOxcontroladvantagesofbothcoalandwater,CWSshowedstrongerNOxreductionability．Relativetotheconditionofvolatilespeakvalueappearance。theNOxr

7、eductionefficiencyofCWSbecamebetteratthereburningzoneexcessairratioof0．9．Withtheincreaseofreburningzonetemperatureanddecreaseoffuelparticlesize，theCWSNOxreductionefficiencyincreased．LowerCWSconcentrationfavoredreburningzoneNOxcontr01．DifferentmetaladditiveshavedifferentNOxreduction

8、catalyticeffects．0．25MWdow