摘要
锅炉烟气中的NO_x是大气污染的重要原因之一。针对燃气锅炉NOx超低排放的要求、以及烟气中大量余热被浪费的现状,提出了烟气脱硝与余热回收一体化的新方法,搭建了一体化实验台,在逆流式烟气喷淋塔中,进行了采用臭氧氧化烟气脱硝、并同时回收烟气余热的实验研究。研究了O_3/NO摩尔比、液气比、碱液吸收对脱硝效果的影响,并对脱硝与余热回收的耦合关系进行了分析。在实验室实验的基础上,进一步进行了实际工程的中试研究。结果表明,烟气脱硝与余热回收一体化是可行的,实验台实验中,当烟气温度为83.0℃、喷淋水温度为46.4℃、液气比为14.8 m^3·L^(-1)、O_3/NO摩尔比为1.6时,脱硝率为30%,同时回收烟气余热量18.5 kW。
NO_x in flue gas is one of the important factors causing air pollution.Based on the strict new NO_x emission standard and the situation that tremendous heat is wasted in flue-gas,this paper has proposed a new method integrating removal of NO_x with ozone oxidation and surplus heat recovery.The integrated experimental system has been established.The influence of O_3/NO molar ratio,liquid to gas ratio and alkaline solution absorption on NO_x removal efficiency was examined,and the relationship between de-NO_x and surplus heat recovery was also studied.Based on the laboratory experimental results,a pilot scale test has been conducted as well.The results show that the integration of removal of NO_x with ozone oxidation and surplus heat recovery of flue-gas is feasible.In the laboratory experiment,under the condition that gas temperature was 83.0 ℃,spraying water temperature was 46.4 ℃,liquid to gas ratio was 14.8 m^3·L^-1 and the O_3/NO ratio was 1.6,the de-NO_x efficiency was 30%,and 18.5 kW surplus heat recovery was recollected.
作者
王静贻
赵玺灵
高庆有
徐熙
付林
WANG Jingyi ZHAO Xiling GAO Qingyou XU Xi FU Lin(Department of Building Technology and Science, Tsinghua University, Beijing 100084, China Beijing Huayuantaimeng Energy- saving Equipment Company Limited,Beijing 100084, China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第10期5515-5522,共8页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金创新研究群体项目(51521005)
关键词
烟气
臭氧
脱硝
余热回收
一体化
flue gas
ozone
NOx removal
surplus heat recovery
integration
