对冲燃烧锅炉低氮燃烧器改造后煤种适应性试验研究Experimental Research on Coal Applicability after Low-NOX Burner Retrofit of Opposed Firing Boiler
章良利,李敏,赵敏,叶凌云,包文东
ZHANG Liangli,LI Min,ZHAO Min,YE Lingyun,BAO Wendong
摘要(Abstract)：
一台660 MW机组的对冲燃烧锅炉进行了低NO_X 燃烧器改造,将原DRB-4Z燃烧器改造为新型Aire Jet燃烧器,并将燃尽风与上层燃烧器的距离由3.5 m改为7 m。燃烧器改造后,进行了燃用蒙煤和澳煤试验,锅炉运行参数正常,SCR装置入口烟气中NO_X 和CO含量都显著降低。燃用不同煤种时的锅炉参数存在较明显的差异。蒙煤的结渣倾向性较强,前屏有一定的结渣,导致再热器减温水量增加、SCR烟温偏高,不过基本上在可控范围内。燃用蒙煤和澳煤时的烟气中NO_X 含量分别在240 mg/m~3以下和320 mg/m~3以下,燃用2组煤种的烟气中NO_X 含量差异最高达到30%左右。SCR装置入口烟气中CO含量总体达到了200μL/L以下的较低水平,但燃用澳煤的烟气中CO含量明显较高,且排烟温度和飞灰含碳量也明显较高。因此燃用蒙煤比燃用澳煤的锅炉效率高1%左右,发电煤耗低3 g/kWh左右,燃用蒙煤具有显著的经济性。
Low-NO_X burner retrofit was applied in opposed firing boiler of a 660 MW unit. The DRB-4Z burners were replaced with the new Aire Jet burners. The distance between OFA and upper burner was modified from 3.5 m to 7 m. After the retrofit, tests were conducted on Mongolia coal and Australian coal respectively,and the operation parameters were as normal as before. NO_X and CO in SCR inlet decreased significantly.There were significant differences in boiler parameters when burning the two coals. The slagging tendency of Mongolia coal is stronger, so there was a thin layer of slag on the front screen, resulting in attempering water in reheater and SCR temperature rise, but in a controllable range. The NO_X concentrations were below 240mg/m~3 and 320 mg/m~3 when burning Mongolia coal and Australian coal respectively. The difference was up to 30%. CO concentration in SCR inlet was less than 200 μL/L, but it was relatively higher when burning Australian coal, and exhaust gas temperature and carbon content in fly ash were also high. The boiler efficiency of Mongolia coal was 1% higher than that of Australian coal, and coal consumption for power generation of Mongolia coal was 3 g/kWh lower than that of Australian coal. It is concluded that the Mongolia coal is more economical.
关键词(KeyWords)：
锅炉;对冲燃烧;低氮燃烧改造;煤种;适应性
boiler;opposed firing;low-NOX burner retrofit;coal;applicability
基金项目(Foundation):
作者(Author):
章良利,李敏,赵敏,叶凌云,包文东
ZHANG Liangli,LI Min,ZHAO Min,YE Lingyun,BAO Wendong
DOI: 10.19585/j.zjdl.2016.11.010
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