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Method for calculating iron ore powder mixing working performance by actually measured standard deviation of mixing material pile
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A technology of standard deviation and iron ore powder, which is applied in the calculation field of iron ore powder mixing operation process effect, can solve the problems of non-use, difficulty in obtaining autocorrelation function of raw materials, and inaccurate reflection.
Inactive Publication Date: 2016-04-06
NANJING IRON & STEEL CO LTD
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[0024] The disadvantage of this calculation method is that when the layers are correlated, as the correlation increases, φ a The value of (KΔt) increases, so that the value of the second item in the square brackets in the formula (v) increases significantly, so that the favorable factors brought about by the increase in the number of layers are offset by this increase in correlation. In practical applications, the acquisition of raw material autocorrelation The function is more difficult, so the method is generally not used
[0042] a, a 1 、a 2 , b are empirical coefficients, a is the slope, b is the intercept, K 1 、K 2 、K 3 Assign values to the weights of each prediction formula participating in the combination; this method actually admits that all the correction formulas cannot accurately reflect the objective facts, and uses the weight to seek accuracy, which is the culmination of repairing
[0043] In the process of continuous development and improvement of the production technology of the iron ore powder mixing operation process, the above methods have been found to have single factors affecting the mixing efficiency and the law of description is not correct enough. The shortcomings of the main factors, the calculation results are far from the actual situation
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Embodiment 1
[0113] 1) Use formula (5) to get σa:
[0114] σa can be obtained from the pass rate P data of the mixing stockpile measured in production, using the formula (5), that is, Ф(t / σa)=(1+P) / 2;
[0115] Look up the standard normal distribution function value table, get t / σa=1.81,
[0116] σa=t / 1.81=0.008 / 1.81=0.0044.
[0117] 2) Use the theoretical calculation σa to calculate the mixing efficiency of the iron ore powder mixing operation process:
[0118] η = P ( A ) [ 1 - P ( A ) ] / σ a = 0.867 × 0.133 / 0.0044 = 77.176.
[0119] 3) Use the actual measuremen...
Embodiment 2
[0122] 1) Use formula (5) to get σa:
[0123] σa can be obtained from the data of the pass rate P of the mixing stockpile measured in production, using the formula (5), that is, Ф(t / σa)=(1+P) / 2;
[0124] Look up the standard normal distribution function value table, get t / σa=1.15,
[0125] σa=t / 1.15=0.008 / 1.15=0.007.
[0126] 2) Use the theoretical calculation σa to calculate the mixing efficiency of the iron ore powder mixing operation process:
[0127] η = P ( A ) [ 1 - P ( A ) ] / σ a = 0.863 × 0.137 / 0.007 = 49.114.
[0128] 3) Use the actual measu...
Embodiment 3
[0131] 1) Use formula (5) to get σa:
[0132] σa can be obtained from the pass rate P data of the mixing stockpile measured in production, using the formula (5), that is, Ф(t / σa)=(1+P) / 2;
[0133] Check the standard normal distribution function value table, get t / σa=1.75,
[0134] σa = t / 1.75 = 0.008 / 1.75 = 0.0046.
[0135] 2) Use the theoretical calculation σa to calculate the mixing efficiency of the iron ore powder mixing operation process:
[0136] η = P ( A ) [ 1 - P ( A ) ] ...
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Abstract
The invention discloses a method for calculating mixing efficiency in iron orepowder mixing work by actually measured standard deviation of mixing material pile, comprising: (1), carrying mathematical simulation to in iron orepowder mixing work procedure, solving the content P(A) of the iron ore in the mixing material; (2), determining the distribution of the iron ore powder discrete type random variable X, and the expectation and variance of the X; (3), solving the standard deviation rhoa of the mixing material pile after iron ore powder mixing work; (4), solving the standard deviation of the random variable X; (5), obtaining the calculation formula for using the actually measured standard deviation of mixing material pile to calculate the iron ore powder mixing work efficiency. The iron ore powder mixing work efficiency calculated by the invention can reflect the production actuality of the mixing work procedure and simultaneously is convenient in production management of the mixing work.
Description
technical field [0001] The invention relates to a method for calculating the effect of an iron ore powder mixing operation process, in particular to a method for calculating the mixing efficiency in the iron ore powder mixing operation by using the actual measured standard deviation of a mixing stockpile. Background technique [0002] Iron and steel enterprises at home and abroad, whether they are new enterprises or old enterprises, have almost generally established large-scale modern iron ore powder mixing operations. The iron ore powder mixing operation has become an important process in the production process of modern iron and steel enterprises. Therefore, in At present, while the technology and equipment of the iron ore powder mixing operation stockyard are constantly improving, how to calculate the mixing efficiency has become the most eye-catching focus of iron and steel enterprises. [0003] The calculation of mixing efficiency is a quantitative description of the im...
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