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首页> 外文期刊>ISIJ international >Combustion Behaviors of Fine Coal and Its Impact on Gas Permeability at Lower Part of Blast Furnace under High Pulverized Coal Rate Operation
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Combustion Behaviors of Fine Coal and Its Impact on Gas Permeability at Lower Part of Blast Furnace under High Pulverized Coal Rate Operation

机译：高粉煤率运转下高炉下部细煤的燃烧行为及其对气体渗透性的影响

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摘要

Practical ways of estimating temperatures of coke flowing into raceway as well as the gas core depth validated by direct measurement were suggested for the purpose of better describing the combustion behaviors of injected coal fine in blast furnace raceway. The numerical simulation model was refurnished with the scheme, and helped clarifying an intriguing effect of coal gasification or decomposition degrees before exiting tuyere tip on attained combustibility of coal at raceway boundary.Another scheme for quantitative expression of pressure losses caused exclusively by coal fine residence in and around raceway was also developed by shutting off coal injection for minutes at practical operation. The obtained results lead to developing the advanced tuyere, CD (converged and diverged) tuyere which enabled reducing the interaction between injectants and hot blast inside tuyere and thus improving overall gas permeability even under conditions of massive coal injection over 250 kg/tHM.
机译：为了更好地描述高炉喷吹道中喷入煤粉的燃烧行为，提出了估算焦炭进入滚道的温度以及通过直接测量验证的气芯深度的实用方法。该方案对数值模拟模型进行了改进，有助于阐明在退出风口前煤的气化或分解程度对煤在滚道边界处可燃性的吸引作用。在实际运行中，通过关闭喷煤几分钟，还开发了滚道周围。获得的结果导致开发了先进的风口，CD（会聚和发散）风口，即使在大剂量注煤超过250 kg / tHM的条件下，也能减少喷口与风口内部热风之间的相互作用，从而提高总体透气性。

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