钒钛磁铁矿焙烧竖炉操作参数对传热过程的影响
|
摘要
以年产量2×10~4t钒钛磁铁矿焙烧竖炉为研究对象,建立竖炉内三维稳态传热数理模型.通过UDF(user defined functions)将反应热以内热源形式编译到固相能量方程中,定义球团矿下移速度,以竖炉内的焙烧时间和温度为判断指标,研究操作参数对竖炉内传热过程的影响.结果表明:焙烧风流量、冷却风流量以及球团下移速度为3个主要影响因素,其中球团下移速度对传热过程的影响更明显.在球团直径为38 mm,焙烧时间为4～6 h,焙烧温度为1 100～1 200 K的条件下,竖炉适宜的操作参数为:冷却风流量1 210～1 430 m~3/h;焙烧风流量3 070～3 670 m~3/h;球团下移速度0. 258～0. 290 m/h.
With a shaft furnace of 2 × 104 tons annual capacity for vanadium titano-magnetite roasting as the research object,a three-dimensional steady-state heat transfer mathematical model of shaft furnace was established. The reaction heat was complied into solid phase energy equation in the form of internal heat source by UDF and the pellet velocity was defined. The roasting time and temperature were used as the evaluation indexes in order to study the effects of operation parameters on heat transfer performance. The results show that the roasting and cooling air volume rates and the pellets velocity are three main factors and the influence of the last one is the largest. Under the conditions of 38 mm pellet diameter,4 ～ 6 h roasting time and 1 100 ～ 1 200 K roasting temperature,the suitable operating parameters are obtained as: the cooling air volume rate is 1 210 ～ 1 430 m~3/h; the roasting air volume rate is 3 070 ～ 3 670 m~3/h; and the moving down velocity of pellets is 0. 258 ～ 0. 290 m/h.
With a shaft furnace of 2 × 104 tons annual capacity for vanadium titano-magnetite roasting as the research object,a three-dimensional steady-state heat transfer mathematical model of shaft furnace was established. The reaction heat was complied into solid phase energy equation in the form of internal heat source by UDF and the pellet velocity was defined. The roasting time and temperature were used as the evaluation indexes in order to study the effects of operation parameters on heat transfer performance. The results show that the roasting and cooling air volume rates and the pellets velocity are three main factors and the influence of the last one is the largest. Under the conditions of 38 mm pellet diameter,4 ～ 6 h roasting time and 1 100 ～ 1 200 K roasting temperature,the suitable operating parameters are obtained as: the cooling air volume rate is 1 210 ～ 1 430 m~3/h; the roasting air volume rate is 3 070 ～ 3 670 m~3/h; and the moving down velocity of pellets is 0. 258 ～ 0. 290 m/h.
引文
[1]张井凡,董辉,蔡九菊,等.一种竖炉式氧化钠化焙烧方法及装置:201110371297. 9[P]. 2012-04-11.(Zhang Jing-fan,Dong Hui,Cai Jiu-ju,et al. Method and device of oxidation-sodium roasting w ith shaft furnace type:201110371297. 9[P]. 2012-04-11.)
[2]董辉,冯军胜,李鹏,等.一种新型钒氧化钠化焙烧竖炉的研究[J].工业炉,2012,34(6):5-8.(Dong Hui,Feng Jun-sheng,Li Peng,et al. Research of a new-style roasting shaft furnace of vanadium oxide[J].Industrial Furnace,2012,34(6):5-8.)
[3] Al-Sumaily G F,Nakayama A,Sheridan J,et al. The effect of porous media particle size on forced convection from a circular cylinder w ithout assuming local thermal equilibrium betw een phases[J]. International Journal of Heat and Mass Transfer,2012,55(13/14):3366-3378.
[4] Pivem A C,Lemos M J S D. Numerical simulation of a crossflow moving porous bed using a thermal non-equilibrium model[J]. International Journal of Heat and Mass Transfer,2013,67(4):311-325.
[5] Nijemeisland M,Dixon A G,Stitt E H. Catalyst design by CFD for heat transfer and reaction in steam reforming[J].Chemical Engineering Science,2004,59(22):5185-5191.
[6]蒋鹭,黄山,王天才,等.球团竖炉气固流动与焙烧过程耦合的三维数值模拟[J].东南大学学报(自然科学版),2012,42(2):301-307.(Jiang Lu,Huang Shan,Wang Tian-cai,et al. Threedimensional numerical simulation of gas-solid flow and roasting process coupling in pelletizing shaft furnace[J].Journal of Southeast University(Natural Science),2012,42(2):301-307.)
[7] Mei D,Xing F,Wen M,et al. Numerical simulation of mixed convection heat transfer of galvanized steel sheets in the vertical alloying furnace[J]. Applied Thermal Engineering,2016,93:500-508.
[8]孙用军.辽西钒钛磁铁矿直接提钒焙烧竖炉气固传热数值计算[D].沈阳:东北大学,2015.(Sun Yong-jun. Numerical study of gas-solid heat transfer on roasting shaft furnace for vanadium titano-magnetite in western Liaoning province[D]. Shenyang:Northeastern University,2015.)
[9] Mahmoudi Y,Maerefat M. Analytical investigation of heat transfer enhancement in a channel partially filled with a porous material under local thermal non-equilibrium condition[J].International Journal of Thermal Sciences,2011,50(12):2386-2401.
[10] Nakayama A,Kuwahara F,Sugiyama M,et al. A two-energy equation model for conduction and convection in porous media[J]. International Journal of Heat and Mass Transfer,2001,44(22):4375-4379.
[11]王国胜,董辉,蔡九菊.球团竖炉热工过程解析与模拟[J].钢铁,2004,39(4):60-63.(Wang Guo-sheng,Dong Hui,Cai Jiu-ju. Analysis and simulation of thermo process in pelletizing shaft furnace[J].Iron and Steel,2004,39(4):60-63.)
[12]邵颖聪.辽西钒钛磁铁矿直接提钒焙烧浸出工艺及竖炉热工过程研究[D].沈阳:东北大学,2015.(Shao Ying-cong. Experimental study on roasting and leaching process of compact extracting vanadium process and analysis on thermo process in roasting shaft furnace[D]. Shenyang:Northeastern University,2015.)
[2]董辉,冯军胜,李鹏,等.一种新型钒氧化钠化焙烧竖炉的研究[J].工业炉,2012,34(6):5-8.(Dong Hui,Feng Jun-sheng,Li Peng,et al. Research of a new-style roasting shaft furnace of vanadium oxide[J].Industrial Furnace,2012,34(6):5-8.)
[3] Al-Sumaily G F,Nakayama A,Sheridan J,et al. The effect of porous media particle size on forced convection from a circular cylinder w ithout assuming local thermal equilibrium betw een phases[J]. International Journal of Heat and Mass Transfer,2012,55(13/14):3366-3378.
[4] Pivem A C,Lemos M J S D. Numerical simulation of a crossflow moving porous bed using a thermal non-equilibrium model[J]. International Journal of Heat and Mass Transfer,2013,67(4):311-325.
[5] Nijemeisland M,Dixon A G,Stitt E H. Catalyst design by CFD for heat transfer and reaction in steam reforming[J].Chemical Engineering Science,2004,59(22):5185-5191.
[6]蒋鹭,黄山,王天才,等.球团竖炉气固流动与焙烧过程耦合的三维数值模拟[J].东南大学学报(自然科学版),2012,42(2):301-307.(Jiang Lu,Huang Shan,Wang Tian-cai,et al. Threedimensional numerical simulation of gas-solid flow and roasting process coupling in pelletizing shaft furnace[J].Journal of Southeast University(Natural Science),2012,42(2):301-307.)
[7] Mei D,Xing F,Wen M,et al. Numerical simulation of mixed convection heat transfer of galvanized steel sheets in the vertical alloying furnace[J]. Applied Thermal Engineering,2016,93:500-508.
[8]孙用军.辽西钒钛磁铁矿直接提钒焙烧竖炉气固传热数值计算[D].沈阳:东北大学,2015.(Sun Yong-jun. Numerical study of gas-solid heat transfer on roasting shaft furnace for vanadium titano-magnetite in western Liaoning province[D]. Shenyang:Northeastern University,2015.)
[9] Mahmoudi Y,Maerefat M. Analytical investigation of heat transfer enhancement in a channel partially filled with a porous material under local thermal non-equilibrium condition[J].International Journal of Thermal Sciences,2011,50(12):2386-2401.
[10] Nakayama A,Kuwahara F,Sugiyama M,et al. A two-energy equation model for conduction and convection in porous media[J]. International Journal of Heat and Mass Transfer,2001,44(22):4375-4379.
[11]王国胜,董辉,蔡九菊.球团竖炉热工过程解析与模拟[J].钢铁,2004,39(4):60-63.(Wang Guo-sheng,Dong Hui,Cai Jiu-ju. Analysis and simulation of thermo process in pelletizing shaft furnace[J].Iron and Steel,2004,39(4):60-63.)
[12]邵颖聪.辽西钒钛磁铁矿直接提钒焙烧浸出工艺及竖炉热工过程研究[D].沈阳:东北大学,2015.(Shao Ying-cong. Experimental study on roasting and leaching process of compact extracting vanadium process and analysis on thermo process in roasting shaft furnace[D]. Shenyang:Northeastern University,2015.)
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |