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Calculation method for describing iron ore sintering bed layer voidage change

A calculation method and porosity technology, applied in calculation, design optimization/simulation, special data processing applications, etc., can solve the problems of unclear physical meaning of parameters, simplified assumptions, and insufficient analysis of changes in bed geometry characteristics, etc. Achieve the effect of satisfying rationality evaluation and improving accuracy

Active Publication Date: 2017-11-10
HUATIAN ENG & TECH CORP MCC +1
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  • Claims
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Problems solved by technology

[0004] However, although the numerical calculation method for the sintered mass-thermal process has been developed for half a century, the research focus is too much on the simulation of the gas-solid heat transfer in the bed and the exploration of the physical and chemical reaction mechanism. The analysis of the changes in bed geometry characteristics is not deep enough
The retrieval found that among the existing sintered mass-thermal process mathematical models, nearly half of the models only considered the heat and mass transfer phenomena in the bed, but did not consider the change of the bed structure; In the model, there are also problems such as insufficient mechanism disclosure, oversimplified assumptions, poor consideration of factors, unclear physical meaning of parameters, and lack of theoretical basis for parameter values.
It can be said that the reason why the existing sintered mass-thermal process mathematical model is only suitable for offline operation analysis is related to the in-depth analysis of the geometric structure characteristics of the bed.

Method used

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  • Calculation method for describing iron ore sintering bed layer voidage change
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  • Calculation method for describing iron ore sintering bed layer voidage change

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Embodiment 1

[0051] Such as figure 1 As shown, the present embodiment describes a calculation method for changing the porosity of the iron ore sintered bed, and the method at least includes the following steps:

[0052] 1) Set the main factors affecting the change of bed porosity during iron ore sintering;

[0053] 2) According to the influence of the set main factors on the change of bed porosity, the comprehensive calculation formula describing the change of bed porosity is obtained;

[0054] 3) Apply the obtained comprehensive calculation formula to the mathematical model of the sinter-thermal coupling process, and determine the change law of bed porosity through comparative analysis.

[0055] The main factor is one of the bed shrinkage rate during the mineral melting and consolidation process, the shape factor of the solid particle variation during the transition from the mixture to the sinter, and the equivalent particle diameter of the particle volume change during the gas-solidific...

Embodiment 2

[0060] Based on the above-mentioned embodiment, the specific steps of calculating the formula for calculating the porosity of the bed according to the influence of the main factors set in the present embodiment on the change of the bed porosity are as follows:

[0061] According to the bed shrinkage rate in the melting and consolidation process of the minerals, the calculation formula for calculating the void ratio of the bed is:

[0062]

[0063] In the formula, ε is the porosity of the bed; ε 0 is the initial porosity of the mixture layer before the bed structure changes, ε 0 =0.315; is the shrinkage rate of the bed;

[0064] According to the shape factor of the variation of the solid particles during the transformation process from the mixture to the sinter, the formula for calculating the porosity of the bed is:

[0065]

[0066] In the formula, ε is the porosity of the bed; ε 0 is the initial porosity of the mixture layer before the bed structure changes, ε 0 ...

Embodiment 3

[0073] Based on the foregoing embodiments, the shrinkage rate of the bed described in this embodiment The calculation formula is:

[0074] m f =min(1,max(0,((T s -T m1 ) / (T m1 -T m2 )) 3 ))

[0075] In the formula, M f is the melting rate achieved by the mineral during melting and consolidation; is the maximum shrinkage rate of the bed, Ts is the temperature of solid particles in the sintering process; T ml and T m2 are the melting initiation temperature and melting completion temperature, respectively, T ml =1373K, T m2 =1673K;

[0076] The formula for calculating the solid particle shape factor is:

[0077]

[0078] In the formula, M f is the melting rate achieved by the mineral during melting and consolidation, is the shape factor of solid particles after shape variation,

[0079] The equivalent particle diameter of the solid particles is described by the shrinkage reaction model, and the calculation formula of the equivalent particle diameter of...

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Abstract

The invention discloses a calculation method for describing iron ore sintering bed layer voidage change. The method at least comprises the following steps that: 1) setting a main factor which influences the bed layer voidage change in an iron ore sintering process; 2) according to the set main factor, calculating the influence on the bed layer voidage change to obtain a comprehensive arithmetic expression for describing the bed layer voidage change; and 3) applying the obtained comprehensive arithmetic expression to a sintering mass-heat coupling process mathematical model, and determining a bed layer voidage change rule through contrastive analysis. By use of the method, the change rule of each band void in the sintering process is simulated, the sensibility of an influence factor is analyzed, and the accuracy of sintering mass-heat coupling process numerical calculation is improved.

Description

technical field [0001] The invention relates to the technical field of iron ore sintering, in particular to a calculation method for describing the variation of porosity in an iron ore sintering bed. Background technique [0002] The purpose of iron ore sintering is to sinter fine ore powder into ore nuggets at high temperature, which can be used as raw materials for blast furnace ironmaking. As one of the most important agglomeration technologies for the production of man-made iron-rich ores, the sintering process has been more widely used because the requirements for raw materials are not as strict as pellets. According to statistics, sinter accounts for more than 50% of the blast furnace charge in the world, while it accounts for more than 80% in my country. [0003] Sintering production is a complex process with strong coupling of multiple process parameters such as flow mass transfer, heat transfer reaction, phase change crystallization, multiple input and output, nonl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50C22B1/16
CPCC22B1/16G06F30/20
Inventor 王淦王浩余波
Owner HUATIAN ENG & TECH CORP MCC