A One-Dimensional Simulation Method for Predicting Clinker Quality in Cement Rotary Kiln

Abstract

A one-dimensional simulation method for predicting calcination quality of clinker in a rotary cement kiln, the method comprising: (1) acquiring relevant information concerning a rotary kiln, the clinker calcination quality of which is to be predicted; (2) establishing a one-dimensional mathematical model of the interior of the rotary cement kiln, which comprises a pulverized coal combustion model, a heat transfer model, a material bed movement model and a clinker mineral chemical reaction model; (3) acquiring data of the actual production of the rotary cement kiln as boundary conditions of the mathematical model ; (4) calculating and obtaining, according to the one-dimensional mathematical model and the boundary conditions, changes in smoke temperature, material temperature, material bed height, wall temperature, material chemical composition and clinker mineral content in the rotary kiln as the length of the rotary kiln; (5) according to the simulation results in step (4), the predicted clinker quality being contents of f‑CaO at a kiln outlet and C3S, C2S, C3A, and C4AF minerals, and optimizing and adjusting, according to the prediction results, the actual production operation.

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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