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Numerical simulation on thermal accumulation of cemented tailings backfill

尾砂胶结充填体蓄热性能的数值模拟

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Abstract

Based on the collaborative exploitation of deep mineral resources and geothermal resources, the thermal accumulation process of cemented tailings backfill (CTB) was studied by numerical simulation. The effects of thermal accumulation time, slurry proportions and temperature conditions on the thermal accumulation of backfill are analyzed, the influence of the heat conduction between backfill and surrounding rock, the heat convection between backfill and airflow on thermal accumulation were compared simultaneously. The results show that the total thermal accumulation capacity increases by approximately 85% within 10–90 d. The influence of surrounding rock temperature and initial temperature on total thermal accumulation capacity is more significant and it is approximately 2 times of the influence of slurry proportions under the conditions of this study. It is clear that the rise of surrounding rock temperature and the decrease of initial temperature can improve the thermal accumulation capacity more effectively. Moreover, the heat conduction accounts for a considerable proportion in the process of thermal accumulation, the average heat conduction capacity is approximately 25 times of the heat convection capacity. This study can provide the theoretical basis and application reference for the optimization of thermal accumulation process of CTB in the exploitation of geothermal resources.

摘要

本文以实现深部矿产资源与地热协同开采为着眼点,对尾砂胶结充填体热累积过程进行数值模拟研究,分析了蓄热时间、料浆配比及热环境对充填体蓄热性能的影响,同时对比了围岩导热与采场风流对流换热对充填体热累积过程的影响。 结果表明:充填体总储热量在蓄热10~90 天增大约85%。 在本文模拟工况下,围岩温度和初始温度对总储热量的影响更为显著,其影响约为浆料配比的2 倍。 可见,围岩温度的升高和初始温度的降低能更有效地提高储热量。 另外,热传导在充填体热积累过程中占有相当大的比重,平均导热量约为热对流量的25 倍。 该研究可为矿井地热资源开发中充填体热累积过程的优化提供理论依据和应用参考。

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Abbreviations

T :

Temperature, °C

c p :

Specific heat at constant pressure, (kJ·kg·°C−1)

h :

Surface convective heat transfer coefficient, (w·m−2·°C−1)

q :

Heat transfer rate, kW

Q :

Total thermal accumulation capacity, kJ

d:

Time, d

λ :

Thermal conductivity, (W·m−1·°C−1)

ρ :

Density, (g·cm−3)

α :

Slurry concentration

β :

Cement-to-tailings ratio

s :

Boundary between CTB and surrounding rock

w :

Boundary between CTB and stope

b :

Surrounding rock

a :

Airflow

bf:

CTB

0:

Initial

n :

Normal direction

cond:

Heat conduction

conv:

Heat convection

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Funding

Projects(51974225, 51674188, 51874229, 51904224, 51904225, 51704229) supported by the National Natural Science Foundation of China; Project(2018KJXX-083) supported by the Shaanxi Innovative Talents Cultivate Program-New-Star Plan of Science and Technology, China; Projects(2018JM5161, 2018JQ5183, 2015JM-074) supported by the Natural Science Basic Research Plan of Shaanxi Province, China; Project(19JK0543) supported by the Scientific Research Program funded by Education Department of Shaanxi Province, China; Project(2018YQ201) supported by the Outstanding Youth Science Fund of Xi’an University of Science and Technology, China

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Authors and Affiliations

  1. Energy School, Xi’an University of Science and Technology, Xi’an, 710054, China

    Xiao-yan Zhang  (张小艳), Min Zhao  (赵敏), Lang Liu  (刘浪), Chao Huan  (郇超), Mu-yan Xu  (许慕妍) & De Wen  (文德)

  2. Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi’an, 710054, China

    Lang Liu  (刘浪)

  3. Department of Civil Engineering, Inha University, Incheon, 402-751, Korea

    Ki-il Song

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  1. Xiao-yan Zhang  (张小艳)
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  2. Min Zhao  (赵敏)
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  6. Mu-yan Xu  (许慕妍)
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  7. De Wen  (文德)
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Contributions

ZHANG Xiao-yan performed the data curation, supervision and writing-review and editing. ZHAO Min performed the formal analysis, investigation, methodology and validation. LIU Lang provided the concept and wrote the original draft. HUAN Chao and SONG KI-IL conducted the formal analysis and validation. XU Mu-yan provided the software supporting. WEN De provided the investigation supporting.

Corresponding author

Correspondence to Lang Liu  (刘浪).

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Conflict of interest

ZHANG Xiao-yan, ZHAO Min, LIU Lang, HUAN Chao, SONG KI-IL, XU Mu-yan and WEN De declare that they have no conflict of interest.

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Zhang, Xy., Zhao, M., Liu, L. et al. Numerical simulation on thermal accumulation of cemented tailings backfill. J. Cent. South Univ. 28, 2221–2237 (2021). https://doi.org/10.1007/s11771-021-4760-4

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