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A Method of Using Neural Network to Predict the Safe Storage Time of Pulverized Coal Covered Coal Pile

A neural network and neural network model technology, applied in the field of coal spontaneous combustion prediction, can solve problems such as uncertainty and prediction lag, and achieve the effect of simple method and wide application range

Active Publication Date: 2021-10-08
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of prediction hysteresis and uncertainty in the current method for preventing coal spontaneous combustion, the present invention provides a method for predicting the safe storage time of pulverized coal covered coal piles by using neural network, so as to prevent spontaneous combustion of coal piles

Method used

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  • A Method of Using Neural Network to Predict the Safe Storage Time of Pulverized Coal Covered Coal Pile
  • A Method of Using Neural Network to Predict the Safe Storage Time of Pulverized Coal Covered Coal Pile
  • A Method of Using Neural Network to Predict the Safe Storage Time of Pulverized Coal Covered Coal Pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Select Shangwan coal with a diameter of 35m and a thickness of 70cm in the middle and lower part of the pulverized coal. The coal pile is stored in a fresh air flow (0.08cm / s) environment. The average porosity of the coal pile is 0.40, and the measuring point is selected at a distance of 2m from the ground. The coal oxide layer with a height and a depth of 1.5m is used as a measuring point for temperature and heat release intensity. The input data for the existing coal stockpile yields the output temperature and heat release intensity values. Table 1 is a comparison table of BP neural network prediction value and literature value of exothermic intensity. figure 2 It is a comparison chart of the predicted value of the BP neural network model of temperature and the measured value of the actual coal pile temperature. It can be seen from Table 1 that the value of the exothermic intensity predicted by the BP neural network fluctuates up and down from the average value of t...

Embodiment 2

[0078] Select Yujialiang coal with a diameter of 35m and a thickness of 80cm in the middle and lower part of the pulverized coal. The coal pile is stored in a fresh air flow (0.08cm / s) environment. The average porosity of the coal pile is 0.45. The measuring point is selected at a distance from the ground The coal oxide layer with a height of 2m and a depth of 1.5m is used as a measuring point for temperature and heat release intensity. The input data for the existing coal stockpile yields the output temperature and heat release intensity values. Table 2 is a comparison table of the BP neural network prediction value and the literature value of the exothermic intensity. image 3 It is a comparison chart of the predicted value of the BP neural network model of temperature and the measured value of the actual coal pile temperature. It can be seen from Table 2 that the value of the exothermic intensity predicted by the BP neural network fluctuates up and down from the average va...

Embodiment 3

[0085] Ciyaowan coal with a diameter of 35m and a thickness of 90cm in the middle and lower part is selected. The coal pile is stored in a fresh air flow (0.08cm / s) environment. The average porosity of the coal pile is 0.48. The measuring point is selected at a distance of 2m from the ground. The coal oxide layer with a height and a depth of 1.5m is used as a measuring point for temperature and heat release intensity. The input data for the existing coal stockpile results in the output temperature and heat release intensity values. Table 3 is a comparison table of BP neural network prediction value and literature value of exothermic intensity. Figure 4 It is a comparison chart of the predicted value of the BP neural network model of temperature and the measured value of the actual coal pile temperature. It can be seen from Table 3 that the value of the exothermic intensity predicted by the BP neural network fluctuates up and down from the average value of the exothermic inte...

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Abstract

The invention discloses a method for predicting the safe storage time of pulverized coal covered coal piles by using a neural network. Firstly, the factors related to the safe storage time are obtained through investigation and analysis, and the pulverized coal coverage thickness, air flow, storage time, The activation energy of coal and the void ratio of coal piles are set as the influencing factors of the safe storage time of coal piles. The heat release intensity and temperature are used as indicators for judging the spontaneous combustion tendency of coal piles. A neural network model is constructed and the minimum mean square error is set for training. The BP neural network model that predicts the temperature and heat release intensity through the influence factors such as stacking time is obtained, and the shortest spontaneous combustion period of the coal pile is calculated accordingly. The invention has the advantages of simple and accurate prediction method, wide application range and the like.

Description

technical field [0001] The invention relates to a method for predicting the safe storage time of pulverized coal covered coal piles by using a neural network, and belongs to the technical field of coal spontaneous combustion prediction. Background technique [0002] my country is rich in coal resources, and its coal production and consumption rank among the top in the world, accounting for more than 85% of the total domestic primary energy production and consumption. However, coal spontaneous combustion fires are very serious in my country. From large-scale coalfield outcrop fires in Xinjiang, Ningxia, and Inner Mongolia, and coal pile spontaneous combustion fires in ground coal yards in mining areas such as Lingwu, Shenfu, and Datong, and wharfs in Qinhuangdao, to underground coal mining areas in mining areas such as Yanzhou, Yima, Jingyuan, and Fushun Spontaneous coal seam fires can be seen everywhere. Spontaneous combustion of coal is a very serious natural disaster, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/27G06N3/04G06N3/08G01N25/22G01N33/22
CPCG06N3/084G01N25/22G01N33/222G06N3/045
Inventor 孟献梁褚睿智万永周苗真勇吴佳欣杨德光吴国光
Owner CHINA UNIV OF MINING & TECH
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