介绍240 t/h循环流化床锅炉烟气和飞灰的分离方式,以及分离装置、返料装置、回料管的结构、布局、运行方式和应用现状,并阐述了返料料腿泄漏的原因。对比试验ZG 30 Cr 26 Ni 5 Re、双金属和ZG 40 Cr 25 Ni 7 Si 2 TiRe等不同的材质的耐...介绍240 t/h循环流化床锅炉烟气和飞灰的分离方式,以及分离装置、返料装置、回料管的结构、布局、运行方式和应用现状,并阐述了返料料腿泄漏的原因。对比试验ZG 30 Cr 26 Ni 5 Re、双金属和ZG 40 Cr 25 Ni 7 Si 2 TiRe等不同的材质的耐磨性,重新优化设计结构型式,最终确定了采用ZG 40 Cr 25 Ni 7 Si 2 TiRe材质+一体偏心成型铸造+“梯形”缓冲带的结构型式的料腿,从根本解决料管泄漏问题。展开更多
本文以斗式提升机为模型,采用DEM(Discrete Element Method)算法对粉料在提升机内运动过程进行离散元模拟仿真,分析粉料颗粒在其内部的运动轨迹,得出粉料粒径以及料斗数对提升机回料率的影响规律,为提升机的结构优化提出理论性的指导。...本文以斗式提升机为模型,采用DEM(Discrete Element Method)算法对粉料在提升机内运动过程进行离散元模拟仿真,分析粉料颗粒在其内部的运动轨迹,得出粉料粒径以及料斗数对提升机回料率的影响规律,为提升机的结构优化提出理论性的指导。结果表明:(1)均匀粉料粒径越小,机尾回料越严重,并得到回料量与粒径之间的关系式;(2)斗数增加可以提高提升机输送效率,降低粉料回料量;(3)随着粉料粒径的增大,料斗填充率呈现先增大后降低的趋势,并在4 mm粉料粒径时得到峰值,填充率达到69%。展开更多
The axial pressure drop profile and the radial solids distribution were measured in a circulating fluidized bed for evaluating the effects of return gas-solids stream position on the riser flow properties.The saturati...The axial pressure drop profile and the radial solids distribution were measured in a circulating fluidized bed for evaluating the effects of return gas-solids stream position on the riser flow properties.The saturation carrying capacity of gas for Geldart B typed particles and the flow mode of return gas-solids stream in the bed were discussed.It was found that arranging the inlet at a higher position of the riser would make the bottom bed leaner when U0 was high and Gs was low.When Gs increased,the longer influenced region of return particles and a small air-staging through lifting the loosening air injection position made the bottom bed become denser significantly.The deceleration and residence of return particles caused a relatively denser but asymmetrical region in the vicinity of inlet.But much more symmetrical solids distribution profile was found in the upper and lower regions far away from the inlet.The effects of inlet height on the flow properties of the riser with air-staging also were analyzed.The secondary air injection below the solids inlet could not cut off the solids exchange in the bed.The bed solids concentration increased when the particles inlet moved to a higher position of the bed when air-staging was adopted.Using CO2 as tracer,the dispersion of the loop-seal-fluidizing air for transmitting the return particles was investigated.It was found that the loop-seal fluidizing air dispersion rate was low but can be enhanced by the secondary air injection.展开更多
文摘介绍240 t/h循环流化床锅炉烟气和飞灰的分离方式,以及分离装置、返料装置、回料管的结构、布局、运行方式和应用现状,并阐述了返料料腿泄漏的原因。对比试验ZG 30 Cr 26 Ni 5 Re、双金属和ZG 40 Cr 25 Ni 7 Si 2 TiRe等不同的材质的耐磨性,重新优化设计结构型式,最终确定了采用ZG 40 Cr 25 Ni 7 Si 2 TiRe材质+一体偏心成型铸造+“梯形”缓冲带的结构型式的料腿,从根本解决料管泄漏问题。
文摘本文以斗式提升机为模型,采用DEM(Discrete Element Method)算法对粉料在提升机内运动过程进行离散元模拟仿真,分析粉料颗粒在其内部的运动轨迹,得出粉料粒径以及料斗数对提升机回料率的影响规律,为提升机的结构优化提出理论性的指导。结果表明:(1)均匀粉料粒径越小,机尾回料越严重,并得到回料量与粒径之间的关系式;(2)斗数增加可以提高提升机输送效率,降低粉料回料量;(3)随着粉料粒径的增大,料斗填充率呈现先增大后降低的趋势,并在4 mm粉料粒径时得到峰值,填充率达到69%。
文摘The axial pressure drop profile and the radial solids distribution were measured in a circulating fluidized bed for evaluating the effects of return gas-solids stream position on the riser flow properties.The saturation carrying capacity of gas for Geldart B typed particles and the flow mode of return gas-solids stream in the bed were discussed.It was found that arranging the inlet at a higher position of the riser would make the bottom bed leaner when U0 was high and Gs was low.When Gs increased,the longer influenced region of return particles and a small air-staging through lifting the loosening air injection position made the bottom bed become denser significantly.The deceleration and residence of return particles caused a relatively denser but asymmetrical region in the vicinity of inlet.But much more symmetrical solids distribution profile was found in the upper and lower regions far away from the inlet.The effects of inlet height on the flow properties of the riser with air-staging also were analyzed.The secondary air injection below the solids inlet could not cut off the solids exchange in the bed.The bed solids concentration increased when the particles inlet moved to a higher position of the bed when air-staging was adopted.Using CO2 as tracer,the dispersion of the loop-seal-fluidizing air for transmitting the return particles was investigated.It was found that the loop-seal fluidizing air dispersion rate was low but can be enhanced by the secondary air injection.
