非均質孔隙率采空區氧化升溫規律四維動態模擬

周佩玲; 張英華; 黃志安; 袁飛; 高玉坤; 王輝; 孫倩

doi:10.13374/j.issn2095-9389.2016.10.002

非均質孔隙率采空區氧化升溫規律四維動態模擬

doi: 10.13374/j.issn2095-9389.2016.10.002

周佩玲¹,
張英華¹,
黃志安^1, ,,
袁飛^2,3,
高玉坤¹,
王輝¹,
孫倩¹

1. 北京科技大學金屬礦山高效開采與安全教育部重點實驗室, 北京 100083;
2. 北京科技大學冶金與生態工程學院, 北京 100083;
3. 北京科技大學鋼鐵冶金新技術國家重點實驗室, 北京 100083

基金項目:

國家自然科學基金資助項目(51474017)

新疆維吾爾自治區基金資助項目(2014211B013)

詳細信息

通訊作者:
黃志安,E-mail:huang_za@qq.com

中圖分類號: TD75⁺2
計量
- 文章訪問數: 253
- HTML全文瀏覽量: 72
- PDF下載量: 10
- 被引次數: 0
出版歷程
- 收稿日期: 2016-03-29
- 網絡出版日期: 2021-07-22

4D dynamic simulation of coal oxidation heating law in gobs with heterogeneous porosity

1. Key Laboratory of High-Efficient Mining and Safety of Metal Mines(the Ministry of Education), University of Science and Technology Beijing, Beijing 100083, China;
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要:
運用Fluent動網格模型實現采空區的四維動態變化,并用用戶自定義函數將煤低溫氧化動力學機理及非均質孔隙率函數編入Fluent中,結合時間和空間,對U+L型通風系統采空區升溫規律進行四維動態模擬研究.研究表明:非均質孔隙率四維動態模型能更真實地反應孔隙率的空間與時間變化,空間某一位置的孔隙率隨時間呈負指數遞減;工作面推進速度越大,采空區升溫速率越小,推進速度為3.6 m·d^-1時平均升溫速率僅為推進速度為1.2 m·d^-1時的1/5;然而,推進速度越大,高溫點的深度越大,不利于自燃的預防;尾巷的存在使得溫度場范圍擴大,溫度升高,CO主要從尾巷流出,尾巷釋放的CO量是回風巷CO釋放量的10倍.最后利用現場實測的數據對結果進行驗證,表明模擬結果是正確可信的.
- 采空區 /
- 非均質孔隙率 /
- 煤燃燒 /
- 氧化升溫 /
- 四維 /
- 動態模擬
Abstract:
Using the Fluent dynamic mesh model to realize the 4D dynamic movement of a gob and inputting the kinetic mechanism of coal low-temperature oxidation and the dynamic change of heterogeneous porosity into Fluent through the user defined function,4D dynamic simulation is performed on the spontaneous heating law in a gob for U + L ventilation of a certain mine. The results show that unsteady heterogeneous porous media can be more realistic in response to the change of porosity,which exponentially decreases with time. The greater the advancing speed of the working face, the smaller the heating rate, and the average heating rate at an advancing speed of 3.6 m·d^-1 is 1/5 of that at an advancing speed of 1.2 m·d^-1. However, the higher the advancing speed, the deeper the depth of the high temperature region, which is unfavorable for the prevention from spontaneous combustion of coal. Because of the existence of a tail roadway in the gob, the temperature field expands, the temperature rises, the main way to release CO is the tail roadway, and the amount of CO from the tail roadway is 10 times that from the outlet. Finally, the results are verified by the field test data, indicating that the simulation results are correct and reliable.
- gobs /
- heterogeneous porosity /
- coal combustion /
- oxidation heating /
- four-dimensional /
- dynamic simulation