Abstract Coke oven batteries utilize stamp charged coal cakes for production of high quality blast furnace coke. Crushed coal blends are mechanically stamped to produce coal cakes. It is crucial to have a good control over this stamping operation so as to achieve a uniform bulk density (≈ 1100–1200 kg·m− 3 wet basis) of coal cake post stamping. This can facilitate robust and energy efficient coking operation. The dynamic nature of the stamping operation necessitates an online bulk density measurement technique. An ultrasonic technique which enables online measurement of bulk density during the stamping operation is described. The ultrasonic response was found to have a straight line correlation with bulk density (wet basis) and moisture content of stamped coal with an R2 value of 0.98. The effect of moisture content in the coal on the ultrasonic measurements is also discussed. A lab scale prototype was developed with integrated sensors to emulate online measurement. The prototype was found to have a measurement error of less than ± 1.6%. This method can also be suitably adapted for online bulk density measurement of granular solids other than crushed coal.

中文翻译：

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焦化厂压装煤饼容重的超声波在线测量技术

摘要 焦炉电池利用压印煤饼生产高品质高炉焦炭。粉碎的混合煤通过机械压印生产煤饼。对这种冲压操作进行良好控制是至关重要的，以便在冲压后实现煤饼的均匀堆积密度（≈ 1100–1200 kg·m− 3 湿基）。这可以促进稳健且节能的焦化操作。冲压操作的动态特性需要在线体积密度测量技术。描述了一种能够在冲压操作期间在线测量体积密度的超声波技术。发现超声波响应与堆积密度（湿基）和压碎煤的水分含量呈直线相关，R2 值为 0.98。还讨论了煤中水分含量对超声波测量的影响。使用集成传感器开发了实验室规模的原型来模拟在线测量。发现原型的测量误差小于±1.6%。该方法也适用于煤粉以外的粒状固体的在线堆积密度测量。