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Mathematical Models and Experimental Verification in the Decarburization of Industrial Scale Stainless Steel Melts

机译：工业规模不锈钢熔体脱碳的数学模型与实验验证

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In this paper, we presented a mathematical model of both the VOD and the ADD processes, which are used for the decarburization of stainless steel. It was shown that by combining this model with on-line gas analysis, we can substantially improve the overall process performance. The critical objective in both of these operations is to achieve a desired endpoint as quickly as possible by oxidizing the carbon and retaining as much of the chromium as we can. It has been generally understood that this objective may be achieved, or at least approached, by reducing the partial pressure of the carbon monoxide in the offgas. This promotes carbon oxidation and ultimately permits the blowing of only an inert gas to reduce the chromium content of the slag. The currently employed "static control' ' schemes make these changes in the blowing strategy in discrete steps at predetermined time intervals without the benefit of on-line analysis. Through the development of the mathematical model presented in this paper, we can divide the process into three distinct stages: (1) The initial stage is when carbon oxidation proceeds at a constant rate, with only the rate of oxygen supply being the limiting factor. (2) Then, at the so-called critical point, the rate is limited by mass transfer and chemical kinetics, but is de pendent on the carbon content of the melt. From this point on, the rate of oxygen supply has to be controlled to avoid the excessive oxidation of chromium. This optimal rate of oxygen supply may be defined and controlled by on-line offgas analysis. (3) Finally, there is a stage when the chromium content of the slag is to be reduced by just inert gas blowing.
机译：在本文中，我们介绍了VOD和ADD工艺的数学模型，这些工艺用于不锈钢的脱碳。结果表明，通过将此模型与在线气体分析相结合，我们可以显着提高整体工艺性能。这两个操作的关键目标是通过氧化碳并保留尽可能多的铬来尽快达到所需终点。通常已经理解，可以通过降低废气中一氧化碳的分压来实现或至少达到该目的。这促进了碳的氧化，并最终仅允许吹入惰性气体以减少炉渣中的铬含量。当前采用的“静态控制”方案在预定的时间间隔内以离散步骤对吹塑策略进行了这些更改，而没有在线分析的好处。通过本文介绍的数学模型的发展，我们可以将过程分为三个不同的阶段：（1）初始阶段是碳氧化以恒定速率进行，只有供氧速率是限制因素；（2）然后，在所谓的临界点，速率受到以下限制：传质和化学动力学，但取决于熔体的碳含量，从这一点开始，必须控制氧气的供给速率，以避免铬的过度氧化。 （3）最后，有一个阶段，仅通过惰性气体吹扫就可以减少炉渣中铬的含量。

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