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Optimization of key parameters for continuous and precise nitrogen injection in goaf based on response surface methodology

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Abstract

In order to solve the problems of coal spontaneous combustion, poor inerting effect of traditional nitrogen injection, and waste of resources in goaf, based on the response surface methodology and Box-Behnken combination test principle, the self-developed continuous and precise nitrogen injection and fire-fighting equipment was used to study the best possible combination of nitrogen injection position (20–90 m), nitrogen injection amount (10–70 m3/min), and air supply volume (2100–2500 m3/min), aiming to minimize the width of the oxidation zone and CO concentration in goaf. The optimal key parameters of continuous precise nitrogen injection were determined as follows: nitrogen injection position 54.17 m, nitrogen injection amount 31.04 m3/min, and air supply 2484.81 m3/min. Under this condition, the width of the oxidation zone was 29.21 ± 0.3 m and the CO concentration was 28.1 ± 4.4 ppm, which were similar to the predicted results of the model (the width of the oxidation zone was 29.41 m; CO concentration was 27.28 ppm). The reliability of the model was verified. These preliminary studies have achieved the purpose of rapid control of the fire in the whole region of the goaf and provided valuable lessons for similar nitrogen injection fire prevention and extinguishing technologies in goaf.

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Data availability

The data and materials used to support the findings of this study are available from the corresponding author upon request.

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Funding

This work was supported by the National Natural Science Foundation of China (No.51774290) and the Fundamental Research Funds for Central Universities (2020YQAQ02 and 2020YJSAQ17).

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Authors and Affiliations

  1. School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Hongqing Zhu, Lintao Hu, Baolin Qu, Qi Liao, Chang Tian, Xiaozhen Song, Xiyang Fang & Xuedong Zhang

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  1. Hongqing Zhu
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  2. Lintao Hu
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  3. Baolin Qu
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  4. Qi Liao
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  5. Chang Tian
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  6. Xiaozhen Song
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  7. Xiyang Fang
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  8. Xuedong Zhang
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Contributions

Hongqing Zhu: investigation, methodology, experiment, data curation, and writing—original draft. Lintao Hu: conceptualization, data curation, funding acquisition, supervision, and writing—review and editing. Baolin Qu: investigation and writing—review and editing. Qi Liao: investigation and writing—review and editing. Chang Tian: investigation and writing—review and editing. Xiaozhen Song: investigation and writing—review and editing. XiYang Fang: investigation and writing—review and editing. Xuedong Zhang: investigation and writing—review and editing.

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Correspondence to Lintao Hu.

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Zhu, H., Hu, L., Qu, B. et al. Optimization of key parameters for continuous and precise nitrogen injection in goaf based on response surface methodology. Environ Sci Pollut Res 30, 40189–40205 (2023). https://doi.org/10.1007/s11356-022-25037-7

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