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The cause of the uneven carbonization process in wet coal charging in coke oven chamber

机译：焦炉室内湿煤装料碳化过程不均匀的原因

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摘要

In the case of the wet coal charging process in coke oven chamber, it is known that the coking process is uneven and a local carbonization delay occurs. The reason was investigated through a laboratory-scale experiment and a quantitative estimation. A partial carbonization test in a test coke oven replicated the uneven plastic layer and local carbonization delay. It was revealed that most of the gas generated in the uncarbonized coal layer results from the evaporation of condensed water and that steam can break through the plastic layer in a test coke oven. Moreover, the order estimation implied that steam that generates in the uncarbonized coal layer and breaks through the plastic layer has sufficient heat capacity to cool the heating wall and delay the carbonization. It was also shown that the steam pressure peak measured in a commercial coke oven is much lower than the estimated steam pressure in this study assuming steam not breaking through the plastic layer. The above-mentioned results and quantitative investigation strongly support the 'steam breaking through the plastic layer' theory proposed by Dr. Rohde that an uneven carbonization process is caused by vaporized coal moisture breaking through the plastic layer at definite, unforeseeable points, which results in cooling of the wall by the steam flow.
机译：已知在焦炉室中进行湿煤装料过程的情况下，焦化过程是不均匀的，并且会发生局部碳化延迟。通过实验室规模的实验和定量评估研究了原因。在测试焦炉中进行的部分碳化测试复制了不均匀的塑料层和局部碳化延迟。结果表明，未碳化煤层中产生的大部分气体是由冷凝水的蒸发引起的，并且蒸汽可以在测试焦炉中穿透塑料层。此外，顺序估计意味着在未碳化的煤层中产生并穿透塑料层的蒸汽具有足够的热容量来冷却加热壁并延迟碳化。还表明，假设蒸汽未突破塑料层，在商用焦炉中测得的蒸汽压力峰值远低于本研究中的估计蒸汽压力。上述结果和定量研究强有力地支持了Rohde博士提出的“蒸汽突破塑料层”理论，即汽化的煤水分在确定的不可预见的点突破塑料层而导致碳化过程不均匀。蒸汽流动使壁冷却。

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