工程科学学报，第41卷，第3期：316-324,2019年3月 Chinese Journal of Engineering,Vol.41,No.3:316-324,March 2019 DOI:10.13374/j.issn2095-9389.2019.03.004:http://journals.ustb.edu.cn 铁矿石烧结过程中不同类型准颗粒的燃烧特性 马鹏楠，程明，周明熙，李亚威，周吴⑧ 浙江大学能源清洁利用国家重点实验室，杭州310027 ☒通信作者，E-mail:zhouhac@ju.ed.cm 摘要采用竖直管式炉研究了焦炭粒径、黏附层、黏附比、焦粉比例对不同类型准颗粒质量转化率和燃料氮转化率的影响. 结果表明，对于S和S型准颗粒，质量转化率均随焦炭粒径的增大而降低：对于S型准颗粒，燃料氮转化率随着焦炭粒径的增 大而减小，而对于存在黏附层的S型准颗粒，内核焦炭粒径越大，燃料氮转化率越大：通过对比S和$型准颗粒的燃烧情况，发 现黏附层的存在有利于提高准颗粒的质量转化率和燃料氮转化率：对于C型准颗粒，黏附比越大，质量转化率和燃料氮转化 率均越小；P型准颗粒的质量转化率随着焦粉比例的增加而减小，燃料氮转化率在焦粉比例为50%时达到最低值. 关键词铁矿石烧结：准颗粒：质量转化率：燃料氮转化率：NO排放 分类号TF046.4 Combustion characteristics of different types of quasi-particles in iron ore sintering process MA Peng-nan,CHENG Ming,ZHOU Ming-xi,LI Ya-wei,ZHOU Hao State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China Corresponding author,E-mail:zhouhao@zju.edu.cn ABSTRACT The iron ore sintering process is the main source of NO,emissions and accounts for about 48%of the total NO,emis- sions in the iron and steel industry.The generated NO,is mainly from fuel consumption,and it usually exists in the form of quasi-parti- cle in iron ore sintering bed.Therefore,it is important to deeply understand the combustion characteristics and NO,formation mecha- nism of quasi-particles in iron ore sintering process.Based on this,the effects of coke breeze particle size,presence of an adhering lay- er of quasi-particles,adhering ratio of quasi-particle,and coke breeze content on the mass conversion rate of different types of quasi- particles and conversion rate of fuel-N to NO,were investigated in a vertical quartz tube reactor in detail.The results show that the mass conversion rate decreases with increasing coke breeze particle size for S'-and S-type quasi-particles:the conversion rate of fuel-N to NO,decreases with increasing coke breeze particle size for S'-type quasi-particle and exhibits the opposite trend for S-type quasi-parti- cle,which is because of the presence of an adhering layer consisting of fine iron ore and limestone.Considering the combustion charac- teristics of S-and S'-type quasi-particles,the presence of an adhering layer of quasi-particles favors the increase of mass conversion rate and conversion rate of fuel-N to NO,.The mass conversion rate and conversion rate of fuel-N to NO,both decrease with increasing ad- hering ratio for C-type quasi-particles whose adhering layer consists of fine limestone and coke breeze.For P-type quasi-particles com- prising coke breeze,fine limestone,and fine iron ore,the mass conversion rate decreases with increasing coke breeze content.The conversion rate of fuel-N to NO,is not linear and reaches the lowest value when coke breeze content is 50%. KEY WORDS iron ore sintering:quasi-particle;mass conversion rate:conversion rate of fuel-N to NO,:NO,emissions 收稿日期：201801-26 基金项目：国家杰出青年基金资助项目(51825605)工程科学学报，第 41 卷，第 3 期: 316--324，2019 年 3 月 Chinese Journal of Engineering，Vol． 41，No． 3: 316--324，March 2019 DOI: 10． 13374 /j． issn2095--9389． 2019． 03． 004; http: / /journals． ustb． edu． cn 铁矿石烧结过程中不同类型准颗粒的燃烧特性 马鹏楠，程 明，周明熙，李亚威，周 昊 浙江大学能源清洁利用国家重点实验室，杭州 310027 通信作者，E-mail: zhouhao@ zju． edu． cn 摘 要 采用竖直管式炉研究了焦炭粒径、黏附层、黏附比、焦粉比例对不同类型准颗粒质量转化率和燃料氮转化率的影响． 结果表明，对于 S 和 S'型准颗粒，质量转化率均随焦炭粒径的增大而降低; 对于 S'型准颗粒，燃料氮转化率随着焦炭粒径的增 大而减小，而对于存在黏附层的 S 型准颗粒，内核焦炭粒径越大，燃料氮转化率越大; 通过对比 S 和 S'型准颗粒的燃烧情况，发 现黏附层的存在有利于提高准颗粒的质量转化率和燃料氮转化率; 对于 C 型准颗粒，黏附比越大，质量转化率和燃料氮转化 率均越小; P 型准颗粒的质量转化率随着焦粉比例的增加而减小，燃料氮转化率在焦粉比例为 50% 时达到最低值． 关键词 铁矿石烧结; 准颗粒; 质量转化率; 燃料氮转化率; NOx 排放 分类号 TF046. 4 收稿日期: 2018--01--26 基金项目: 国家杰出青年基金资助项目( 51825605) Combustion characteristics of different types of quasi-particles in iron ore sintering process MA Peng-nan，CHENG Ming，ZHOU Ming-xi，LI Ya-wei，ZHOU Hao State Key Laboratory of Clean Energy Utilization，Zhejiang University，Hangzhou 310027，China Corresponding author，E-mail: zhouhao@ zju． edu． cn ABSTＲACT The iron ore sintering process is the main source of NOx emissions and accounts for about 48% of the total NOx emis￾sions in the iron and steel industry． The generated NOx is mainly from fuel consumption，and it usually exists in the form of quasi-parti￾cle in iron ore sintering bed． Therefore，it is important to deeply understand the combustion characteristics and NOx formation mecha￾nism of quasi-particles in iron ore sintering process． Based on this，the effects of coke breeze particle size，presence of an adhering lay￾er of quasi-particles，adhering ratio of quasi-particle，and coke breeze content on the mass conversion rate of different types of quasi￾particles and conversion rate of fuel-N to NOx were investigated in a vertical quartz tube reactor in detail． The results show that the mass conversion rate decreases with increasing coke breeze particle size for S'- and S-type quasi-particles; the conversion rate of fuel-N to NOx decreases with increasing coke breeze particle size for S'-type quasi-particle and exhibits the opposite trend for S-type quasi-parti￾cle，which is because of the presence of an adhering layer consisting of fine iron ore and limestone． Considering the combustion charac￾teristics of S-and S'-type quasi-particles，the presence of an adhering layer of quasi-particles favors the increase of mass conversion rate and conversion rate of fuel-N to NOx ． The mass conversion rate and conversion rate of fuel-N to NOx both decrease with increasing ad￾hering ratio for C-type quasi-particles whose adhering layer consists of fine limestone and coke breeze． For P-type quasi-particles com￾prising coke breeze，fine limestone，and fine iron ore，the mass conversion rate decreases with increasing coke breeze content． The conversion rate of fuel-N to NOx is not linear and reaches the lowest value when coke breeze content is 50% ． KEY WOＲDS iron ore sintering; quasi-particle; mass conversion rate; conversion rate of fuel-N to NOx ; NOx emissions