喷淋塔式烟气冷凝余热回收与低氮排放协同处理系统实验研究  

Experimental Study on the Synergetic Treatment for Waste Heat Recovery and Low Nitrogen Emission from Spray Tower Flue Gas

作　　者：张群力[1,2] 牛宇 孙东晗 肖鑫 沈祺 刘芳[1] ZHANG Qun-li;NIU Yu;SUN Dong-han;XIAO Xin;SHEN Qi;LIU Fang(Beijing Key Laboratory of Heating,Gas Supply,Ventilating and Air Conditioning Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学,供热、供燃气、通风及空调工程北京市重点实验室,北京100044 [2]北京建筑大学,北京未来城市设计高精尖创新中心,北京100044

出　　处：《科学技术与工程》2021年第6期2321-2327,共7页Science Technology and Engineering

基　　金：北京市自然科学基金重点项目(SQKZ201510016001);北京市属高校基本科研业务费专项资金(X18185);北京建筑大学研究生创新项目(PG2020003)。

摘　　要：为协同处理好燃气锅炉的烟气冷凝余热回收与低氮排放问题,提出喷淋塔式烟气冷凝余热回收与低氮排放协同处理技术方式,并搭建了该协同处理技术的实验台。该方式将烟气冷凝余热回收段和助燃空气加湿段进行集成设计。实验研究了热网回水温度、喷淋水流量、空气加湿段液气比和助燃空气含湿量等因素对系统性能的影响规律,发现助燃空气含湿量是影响烟气冷凝余热回收与低氮排放协同处理效果的关键影响因素。实验结果表明:当维持热网回水温度为45.0℃,喷淋水流量为0.83 m^(3)/h工况时,该系统的烟气余热回收效率可达12.2%,热网余热利用效率为6.9%;排放烟气的氮氧化物浓度可降至50.0 mg/m^(3),氮氧化物减排效率为61.4%。该喷淋塔式烟气冷凝余热回收与低氮排放协同处理技术方式不仅可以高效回收烟气冷凝余热,还可以有效降低氮氧化物排放浓度,具有很大的节能、环保与经济效益和推广应用前景。To deal with the problem of waste heat recovery from flue gas condensation and low nitrogen emission of gas-fired boiler,a synergetic treatment was developed combining spray tower flue gas condensation and low nitrogen emission,and the experimental platform of the synergetic treatment technology was established.In the treatment,the waste heat recovery section of flue gas condensation and combustion air humidification section were integrated.The influence of the return water temperature of the heat supply network,the spray water flow rate,the liquid-gas ratio in the air humidification section,and the moisture content of combustion supporting air on the system performance were experimentally studied.It is found that the moisture content of combustion air is the key factor affecting the synergetic effect.Under the conditions of the return water temperature 45.0℃and the spray water flow rate 0.83 m^(3)/h,the flue gas waste heat recovery efficiency reaches 12.2%,and the waste heat utilization efficiency of heat supply network is 6.9%.The NO x concentration in the flue gas is reduced to 50.0 mg/m^(3),and the NO x emission reduction efficiency is 61.4%.The synergetic treatment can not only efficiently recover the flue gas condensation waste heat,but also effectively reduce the NO x emission concentration,which has great energy saving,good environmental protection,considerable economic benefits,and bright application prospects.

关 键 词：燃气锅炉 烟气冷凝 余热回收 低氮排放 空气加湿 

分 类 号：TK115[动力工程及工程热物理—热能工程]