耐火度检测用竖式碳阻炉的改进
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摘要
为了提高耐火度检测用竖式碳阻炉的耐用性和好用性,进行了如下改进:1)将一段式炉管改为三段插接式炉管,方便更换炉管,且提高了炉管的使用寿命;在炉管配料中适当引入了部分低膨胀率的堇青石骨料,增大临界粒度,提高中、粗颗粒占比到60%(w),成型方法也由浇注成型改为挤压成型,提高了炉管的使用寿命。2)将炭粒预先煅烧,减少其挥发分和水分,提高其密度和强度;对上低温带、下低温带、高温带分别使用三种不同粒度级配的炭粒,加大高温带炭粒的粒度,减小了炭粒的氧化速度,延长了炭粒的使用次数。3)增加了保温观察冒口,减少了热量损失,提高了热效率和升温速率,且有利于观察测温锥变化情况。4)改进前使用7～9次就需要重装一次炉体(主要是更换炉管、炭粒),改进后使用20～25次才需要重装一次炉体,不仅降低了使用成本,而且大大提高了竖式碳阻炉的使用效率。
In order to improve the durability and convenience of vertical carbon resistance furnace for testing refractoriness,the following improvements were made.( 1) The one-section furnace tube was replaced by the three-section plug-in furnace tube to facilitate the replacement of furnace tube and improve the service life of furnace tube; In addition,some low expansion rate cordierite aggregates were appropriately introduced in the formulation of the furnace tube to increase the critical particle size and increase the mass proportion of medium and coarse particles to 60%. The molding method was changed from pouring molding to extrusion molding,which improved the service life of the furnace tube.( 2) The carbon particles were precalcined to reduce the volatiles and moisture,and to increase the density and strength. For upper and lower low temperature zones and high temperature zone,three kinds of carbon particles with different particle sizes distributions were used. The size of carbon particles for high temperate zone was increased to reduce the oxidation rate of carbon particles and prolong the times of use.( 3) The heat preservation observation ports are set,which reduced the heat loss and enhanced the thermal efficiency and heating rate,and were beneficial to observe the change of temperature cone.( 4) The reinstallation of the furnace body was delayed from 7-9 cycles to 20-25 cycles( mainly replacing the furnace tube and carbon particles). The improvement not only reduced the use cost,but also greatly improved the efficiency of the vertical carbon resistance furnace.
In order to improve the durability and convenience of vertical carbon resistance furnace for testing refractoriness,the following improvements were made.( 1) The one-section furnace tube was replaced by the three-section plug-in furnace tube to facilitate the replacement of furnace tube and improve the service life of furnace tube; In addition,some low expansion rate cordierite aggregates were appropriately introduced in the formulation of the furnace tube to increase the critical particle size and increase the mass proportion of medium and coarse particles to 60%. The molding method was changed from pouring molding to extrusion molding,which improved the service life of the furnace tube.( 2) The carbon particles were precalcined to reduce the volatiles and moisture,and to increase the density and strength. For upper and lower low temperature zones and high temperature zone,three kinds of carbon particles with different particle sizes distributions were used. The size of carbon particles for high temperate zone was increased to reduce the oxidation rate of carbon particles and prolong the times of use.( 3) The heat preservation observation ports are set,which reduced the heat loss and enhanced the thermal efficiency and heating rate,and were beneficial to observe the change of temperature cone.( 4) The reinstallation of the furnace body was delayed from 7-9 cycles to 20-25 cycles( mainly replacing the furnace tube and carbon particles). The improvement not only reduced the use cost,but also greatly improved the efficiency of the vertical carbon resistance furnace.
引文
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[4]周旺枝,刘黎,张洪雷.摄像型耐火度测试方法在冶金材料分析中的应用[J].武钢技术,2015,53(3):28-30,62.