煤粉耦合生物质气协同降低NO_(x)和CO_(2)的排放技术  

Synergistic reduction of NO_(x)and CO_(2)emissions by coupling pulverized coal with biomass gas

作　　者：范宝田 严祯荣 苏厚德 刘岑凡 宋玉娟 FAN Baotian;YAN Zhenrong;SU Houde;LIU Cenfan;SONG Yujuan(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Lanbin Petrochemical Equipment Co.,Ltd.,Shanghai 201518,China;Mechanical Industrial Key Laboratory of Boiler Low-Carbon Technology,Shanghai 201620,China;China Special Equipment Inspection&Research Institute,Beijing 100029,China;Shanghai Electrical Apparatus Research Institute(Group)Co.,Ltd.,Shanghai 200063,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620 [2]上海蓝滨石化设备有限责任公司,上海201518 [3]机械工业锅炉低碳化技术重点实验室,上海201620 [4]中国特种设备检测研究院,北京100029 [5]上海电器科学研究所(集团)有限责任公司,上海200063

出　　处：《化工进展》2023年第10期5501-5508,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金重点项目(51736007);国家重点研发计划(2021YFF0600604)。

摘　　要：针对我国提出的“双碳”目标,以某350MW煤粉/生物质气混烧锅炉为研究对象,数值模拟了生物质气的掺烧比和空气分级技术对炉内温度、NO_(x)和CO_(2)的生成量及煤粉的燃尽特性的影响。结果表明:增加生物质气的掺烧量和空气分级技术均会降低主燃烧器区的温度,温度由1539K降至1266K,炉内火焰中心上移。由于炉内还原气氛介质增加、主燃烧器区温度降低、生物质气中N_(2)的占比多及CO_(2)占比少的综合因素,煤粉/生物质气混烧联合空气分级技术能协同降低NO_(x)和CO_(2)的排放量,NO_(x)排放量由345μL/L降至88μL/L,CO_(2)排放量由22.90%降至10.67%。但煤粉混烧生物质气会减少煤粉颗粒在炉内的停留时间,建议通过增大炉膛高度、减小煤粉颗粒的粒径、将生物质气预处理到较高温度等方法提高煤粉的燃尽率。该研究结果可为煤粉/生物质气混烧锅炉的低氮和低碳运行提供技术支持。In view of the“double carbon”policy goal proposed by China,taking a 350MW pulverized coal/biomass gas mixed combustion boiler as the research object,the effects of biomass gas blending ratio and air classification technology on the furnace temperature,NO_(x)and CO_(2)generation and the burnout characteristics of pulverized coal were numerically simulated.The results showed that the temperature of the main burner zone will be reduced by increasing the blending amount of biomass gas and the air classification technology.The temperature will be reduced from 1539K to 1266K,and the flame center in the furnace will move upward.Due to the comprehensive factors such as the increase of the reducing atmosphere medium in the furnace,the decrease of the temperature in the main burner area,the large proportion of N_(2) in the biomass gas and the small proportion of CO_(2),the pulverized coal/biomass gas co-combustion combined with air classification technology can synergistically reduced the emissions of NO_(x)and CO_(2),with NO_(x)emissions reduced from 345μL/L to 88μL/L,and CO_(2)emissions reduced from 22.90%to 10.67%.However,the mixing of pulverized coal and biomass gas will reduce the residence time of pulverized coal particles in the furnace.It was recommended to increase the burnout rate of pulverized coal by increasing the furnace height,reduced the particle size of pulverized coal particles,and pretreated the biomass gas to a higher temperature.The research results can provided technical support for low nitrogen and low carbon operation of pulverized coal/biomass gas co-fired boiler.

关 键 词：煤粉/生物质气 掺烧比 空气分级 碳排放 数值模拟 

分 类 号：TK229.91[动力工程及工程热物理—动力机械及工程]