One-dimensional simulation method for predicting cement kiln clinker quality

Abstract

The invention discloses a one-dimensional simulation method for predicting cement kiln clinker quality. The method comprises steps of (1) collecting relative information of a rotary kiln, to which clinker quality is to be predicted, (2), building a one-dimensional mathematic model in the cement rotary kiln, (3) collecting practical production part data of the cement rotary kiln as a border condition of the mathematic model, (4) calculating change conditions of smoke temperature, material temperature of the rotary kiln, a material bed height, wall surface temperature, material chemical components and clinker mineral contents along with the length change of the rotary kiln according to the one-dimensional mathematic model and the border condition, and (5) optimizing and adjusting the practical production operation according to the prediction result. According to the simulation result in the (4) step, the predicted clinker quality is contents of f-CaO, and C3S, C2S, C3A and C4AF. In the (2) step, the process innovatively provides a pulverized coal firing model and comprises a heat transmission module, a material bed motion model and a clinker mineral material chemical reaction model.

Description

technical field [0001] The invention belongs to the field of cement production and relates to a one-dimensional simulation method for predicting clinker quality of a cement rotary kiln. The method is applicable to various cement calcining processes involving the rotary kiln, such as a new dry method rotary kiln and a wet method rotary kiln. Background technique [0002] The cement industry is an important basic raw material industry in my country. In 2015, my country's cement output reached 2.35 billion tons, providing an important guarantee for my country's infrastructure construction and urban-rural integration development. Among them, the quality of cement products directly affects the safety and long-term performance of infrastructure such as related buildings. Criteria for evaluating cement quality include fineness, insoluble matter, magnesium oxide content, strength at different ages, etc. Among them, the strength of cement at different ages (including 3 days and 28 d...

AI Technical Summary

Problems solved by technology

As a result, existing models of pulverized coal combustion do not match reality

[0008] For the three-dimensional model, although the complex motion and combustion form of coal powder particles under the action of each air duct of the coal injection pipe can be considered, there are two main problems. One is that the motion of the material bed cannot be directly expressed, and it needs to be combined The combination of the one-dimensional model of the movement increases the complexity of the model; the second is that the three-dimensional model needs to perform grid division and other processing on the rotary kiln, the operation is complicated, the calculation time is long, and it cannot be directly used for online simulation calculation at this stage , can only be used for offline result analysis, etc.

[0009] From the above analysis, it can be seen that because the clinker calcination process in the rotary kiln is very complicated and there are many influencing factors, the existing mathematical model cannot accurately describe the actual process

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