摘要
为实现燃瓦斯气加热炉氮氧化物(NOx)排放低于200 mg/m3(O2体积分数3.5%)的要求,提出高效的再燃低氮改造方案.通过数值计算和工业试验相结合的方法对其进行验证.采用FLUENT软件计算不同再燃瓦斯气比例和当量比下,不同截面温度及NOx质量浓度分布,NOx生成还原特性和瓦斯气未燃尽率等.根据优化的数值计算结果对加热炉进行改造,进行连续一周的工业试验.结果表明:增加再燃比,燃烧空间高温区域比例降低,热力型NOx生成量减少且减幅增大,再燃作用对NOx的还原率先升高后降低.当再燃比为0.20时,再燃作用还原NOx的效率最高.增加再燃比或降低主燃区当量比将降低NOx浓度,但瓦斯气未燃尽率升高.通过与工业试验对比,验证了计算的可靠性.当再燃比为0.15~0.20,主燃区当量比为1.15~1.20时,NOx质量浓度最高值约160 mg/m3,均值约130 mg/m3(O2体积分数3.5%),且瓦斯气未燃尽率较低.
To realize nitric oxides（ NOx） emission regulation below 200 mg/m3（ O2 volume fraction at 3. 5%） in heating furnace fired refining gas,a high efficiency low nitrogen reconstruction scheme by reburning technology was proposed,and it was confirmed by numerical calculation and industrial test. The software of FLUENT was applied to investigate the effects of reburn refining gas ratio and primary area stoichiometric ratio on the distribution of temperature and NOxmass concentration at different sections,generation,reduction characteristics of NOxand unburned rate of refining gas. According to the optimized numerical calculations, the reconstruction was implemented and industrial test was carried out for one week. The results showed that,with the reburn fuel ratio increasing,the proportion of high temperature space decreased,the amount of thermal NOxreduced and reduction increased,the NOxreduction efficiency by reburning impact firstly increased and then decreased. The highest NOx reduction efficiency by reburning impact when the reburn fuel ratio was 0.20. Increasing the reburn fuel ratio and decreasing the primary area stoichiometric ratio could increase the NOxreduction efficiency,but the unburned fuel ratio increased meanwhile. When the reburn fuel ratio between 0.15 ~ 0.20 and the primary area stoichiometric ratio between 1.15 ~ 0.20,the greatest and average values of NOx mass concentration were 160 mg/m3 and 130 mg/m3（ O2 volume fraction at 3.5%） respectively.
作者
王义德
孙巧群
张成志
高建民
刘同仁
李喜梅
王华山
杜谦
WANG Yide1,2, SUN Qiaoqun3, ZHANG Chengzhi4, GAO Jianmin1, LIU Tongren5,LI Ximei1,2, WANG Huashan2, DU Qian1(1. Research Institute of Combustion Engineering, Harbin Institute of Technology, Harbin 150001, China; 2. College ofVehicles and Energy, Yanshan University, Qinhuangdao 066004, Hebei, China; 3. College of Aerospace and Civil Engineering,Harbin Engineering University, Harbin 150001, China; 4. Shenyang Huashun Heating Group, Shenyang 110000, China;5. Shandong Longfu Oil Shale Comprehensive Utilization Co., Ltd., Longkou 265700, Shandong, Chin)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2018年第7期46-51,共6页
Journal of Harbin Institute of Technology
基金
国家自然科学基金项目(51506035)
十二五国家科技支撑计划项目(2014BAA07B03)
关键词
氮氧化物
蓄热式加热炉
瓦斯气
再燃技术
数值模拟
nitric oxides
regenerative heating furnace
refining gas
reburning technology
mathematical modeling
