In order to prolong the service life of castables for hot blast stove pipes,effects of SiO2 micropowder addition and aggregate kind on properties of castables for hot blast stove pipes,and properties of silica sol bon...In order to prolong the service life of castables for hot blast stove pipes,effects of SiO2 micropowder addition and aggregate kind on properties of castables for hot blast stove pipes,and properties of silica sol bonded castables were researched using homogenized bauxite,andalusite particles,andalusite fines,white fused corundum fines,α-Al2O3 micropowder,pure calcium aluminate cement,SiO2 micropowder,and silica sol as starting materials. The results show that：（1） as SiO2 micropowder addition increases,the shrinkage rate of fired specimens increases; BD increases firstly,reaches the highest at 4 mass%,and then decreases; CMOR and CCS of all specimens increase gradually; so the appropriate SiO2 micropowder addition is 4 mass%;（2） the specimens with bauxite aggregate have better CCS and volume stability,but specimens with andalusite aggregate have better thermal shock resistance;（ 3） for castables for hot blast stoves using silica sol as binder,the addition of pure calcium aluminate cement can decrease the linear change rate after treatment at 1 400℃ and can slightly enhance CCS and CMOR,but has very little influence on AP and BD; and the introduction of citric acid worsens the thermal shock resistance of specimens.展开更多
The dynamic strain field under the action of blasting load is measured by means of a super-dynamic strain system and a CS2092H dynamic measuring analysis system, and the relation between the peak valwe of strain and t...The dynamic strain field under the action of blasting load is measured by means of a super-dynamic strain system and a CS2092H dynamic measuring analysis system, and the relation between the peak valwe of strain and the quantity of explosive charge is obtained. And the authors probe into the mechanism of soot descaling of soot-delivery pipe under the action of blasting, and offer an effective method to clean soot in soot-delivery pipe. The study provides a theoretical basis for a further study on blasting descaling or soot-delivery pipe.展开更多
This article shows an innovative method to model and validate the hot air flow through the blast furnacés tuyeres. This study will be the basis for flow measurements implementation and safety interlocks for the p...This article shows an innovative method to model and validate the hot air flow through the blast furnacés tuyeres. This study will be the basis for flow measurements implementation and safety interlocks for the pulverized coal injection. The flow measurements were taken in the blast furnace down leg pipes by installing refractory Venturi tubes. The system for the calculation of differential pressure takes into consideration the dimension of the Venturi, the air density and compressibility. The objective is to specify the flow transmitters required to automate a control system and implement safety interlocks for the coal injection plant.展开更多
对莱钢型钢炼铁厂2×1880 m 3高炉配套喷煤系统进行介绍,针对原倒料工艺系统存在的问题,利用高炉大修期间对喷煤系统倒料工艺进行了优化和创新,采取了更换磨损管道并加粗主管道、增加切断阀门、加设预留口等措施,保障了煤粉的流动性...对莱钢型钢炼铁厂2×1880 m 3高炉配套喷煤系统进行介绍,针对原倒料工艺系统存在的问题,利用高炉大修期间对喷煤系统倒料工艺进行了优化和创新,采取了更换磨损管道并加粗主管道、增加切断阀门、加设预留口等措施,保障了煤粉的流动性,实现6组喷吹罐均可向粒煤一期和粒煤二期收粉系统进行倒料,为拆卸更换旋转喂料机检修创造条件。展开更多
文摘In order to prolong the service life of castables for hot blast stove pipes,effects of SiO2 micropowder addition and aggregate kind on properties of castables for hot blast stove pipes,and properties of silica sol bonded castables were researched using homogenized bauxite,andalusite particles,andalusite fines,white fused corundum fines,α-Al2O3 micropowder,pure calcium aluminate cement,SiO2 micropowder,and silica sol as starting materials. The results show that：（1） as SiO2 micropowder addition increases,the shrinkage rate of fired specimens increases; BD increases firstly,reaches the highest at 4 mass%,and then decreases; CMOR and CCS of all specimens increase gradually; so the appropriate SiO2 micropowder addition is 4 mass%;（2） the specimens with bauxite aggregate have better CCS and volume stability,but specimens with andalusite aggregate have better thermal shock resistance;（ 3） for castables for hot blast stoves using silica sol as binder,the addition of pure calcium aluminate cement can decrease the linear change rate after treatment at 1 400℃ and can slightly enhance CCS and CMOR,but has very little influence on AP and BD; and the introduction of citric acid worsens the thermal shock resistance of specimens.
文摘The dynamic strain field under the action of blasting load is measured by means of a super-dynamic strain system and a CS2092H dynamic measuring analysis system, and the relation between the peak valwe of strain and the quantity of explosive charge is obtained. And the authors probe into the mechanism of soot descaling of soot-delivery pipe under the action of blasting, and offer an effective method to clean soot in soot-delivery pipe. The study provides a theoretical basis for a further study on blasting descaling or soot-delivery pipe.
文摘This article shows an innovative method to model and validate the hot air flow through the blast furnacés tuyeres. This study will be the basis for flow measurements implementation and safety interlocks for the pulverized coal injection. The flow measurements were taken in the blast furnace down leg pipes by installing refractory Venturi tubes. The system for the calculation of differential pressure takes into consideration the dimension of the Venturi, the air density and compressibility. The objective is to specify the flow transmitters required to automate a control system and implement safety interlocks for the coal injection plant.
文摘对莱钢型钢炼铁厂2×1880 m 3高炉配套喷煤系统进行介绍,针对原倒料工艺系统存在的问题,利用高炉大修期间对喷煤系统倒料工艺进行了优化和创新,采取了更换磨损管道并加粗主管道、增加切断阀门、加设预留口等措施,保障了煤粉的流动性,实现6组喷吹罐均可向粒煤一期和粒煤二期收粉系统进行倒料,为拆卸更换旋转喂料机检修创造条件。
