燃气锅炉烟气潜热势利用技术研究  

The Utilization Technology Research of Flue Gas Latent Heat in Gas-fired Boilers

作　　者：赵亚笛 王纪晔 宋光武[1] 罗志云[1] 闫静[1] 刘艳梅 ZHAO Ya-di;WANG Ji-ye;SONG Guang-wu;LUO Zhi-yun;YAN Jing;LIU Yan-mei(Beijing Municipal Research Institute of Environmental Protection,Beijing 100037,China;School of Food,Beijing Technology and Business University,Beijing 100048,China)

机构地区：[1]北京市环境保护科学研究院,北京100037 [2]北京工商大学食品学院,北京100048

出　　处：《节能技术》2019年第5期408-412,446,共6页Energy Conservation Technology

基　　金：首都蓝天行动培育项目(Z181100005418006);大气重污染成因与治理攻关项目(DQGG0209-01)

摘　　要：为进一步提高燃气锅炉热效率,同时兼顾低氮燃烧技术的应用,研发了一种烟气潜热回收与低氮燃烧耦合技术,并对1台7 MW燃气热水锅炉实施改造,通过实测对比分析改造前后锅炉能效和NOx排放的变化。结果表明:改造后烟气潜热回收率提高,锅炉热效率升至102.7%,提高了6.2%;其中,锅炉本体和省煤器结算热分别提高1.3%和5.5%,散热损失增加0.6%。NOx排放浓度与助燃空气含湿量有关,随助燃空气含湿量升高显著降低,当助燃空气含湿量为116.6 g/kg时,NOx排放浓度可低至19 mg/m^3;改造后锅炉单位热产品NOx减排率达80%以上,环境效益显著。Taking into account the application of low nitrogen combustion technology,a coupling technology of latent heat recovery from flue gas and low-nitrogen combustion was developed to further improve the thermal efficiency of gas-fired boiler.A 7 MW gas-fired hot water boiler was retrofitted on the basis of the technology.And the change of boiler energy efficiency and NOx emission before and after retrofitting was analyzed by comparing the measured data.The results showed that the recovery of latent heat of flue gas was improved after modification.Boiler thermal efficiency was increased by 6.2%,reaching 102.7%.The clearing heat of the boiler body and economizer was increased by 1.3%and 5.5%respectively,but the heat loss was increased by 0.6%.The concentration of NOx emission is related to the moisture content of combustion-supporting air,which decreases significantly with the increase of the moisture content of combustion-supporting air.When the moisture content of combustion air was 116.6 g/kg,the concentration of NOx emission could be cut down to 19 mg/m^3.Since the reduction rate of NOx emission per unit heat product of the reformed boiler is more than 80%,the environmental benefits of the technology are remarkable.

关 键 词：燃气锅炉 烟气潜热回收 热效率 低氮燃烧 减排 

分 类 号：TE08[石油与天然气工程]