Development and Experimental Verification of a 1m³ Explosion-Proof Electro-Hydraulic Sand Mixing Skid for Coal Mine Underground Hydraulic Fracturing

Zeyuan Li; Jinjian Yu; Xintang Liu; Congliang Xu; Ruikun Pang

doi:10.54691/qv44qe75

Authors

Zeyuan Li
Jinjian Yu
Xintang Liu
Congliang Xu
Ruikun Pang

DOI:

https://doi.org/10.54691/qv44qe75

Keywords:

Underground Coal Mine; Electro-Hydraulic Driven Sand Mixing Skid; Hydraulic Fracturing; Explosion-Proof Design; Load-Sensitive System.

Abstract

To address the demand for efficient and safe sand mixing equipment in hydraulic fracturing operations within coal mine underground environments, this paper presents the development of a 1m³ electro-hydraulic driven sand mixing skid. The equipment adopts an electro-hydraulic drive system, adapting to the explosion-proof requirements of coal mine underground settings. It integrates key modules including a hydraulic system, electrical control system, and mechanical structure.The paper elaborates on the development background, technical specifications, working principles, and overall system design (covering mechanical structure, hydraulic system, and electrical control system), as well as the prototype manufacturing and experimental verification process. Test results demonstrate that the system achieves a discharge flow rate ≥ 1 m³/min, a maximum discharge pressure ≥ 0.5 MPa, and a controllable sand concentration range of 3% to 15%, meeting the design requirements. During an 8-hour full-load temperature rise test, the hydraulic system exhibited a temperature rise ≤ 50°C while operating stably.The successful development of this equipment provides reliable technical support for hydraulic fracturing operations in coal mine underground environments and holds promising prospects for broader application.

Downloads

Download data is not yet available.

References

[1] Yang yunfan, Liu zhiqiang, Gao xianbo,etl. Research Progress on Hydraulic Fracturing Technology in Underground Coal Mines[J]. Journal of China Coal Society, 2020,45(5):1800-1810.

[2] JOHNSON A F, HOLZAPFEL M. Application of load-sensitive hydraulic systems in mining equipment[J]. Mining Engineering, 2019, 71(3): 45-50.

[3] Jia dongqin, Ke ping. Design Specifications and Applications of Mine Explosion-proof Electrical Equipment[C]. Proceedings of the Academic Annual Conference of the China Coal Society, 2021: 120-125.

[4] State Administration of Work Safety. Coal Mine Safety Regulations [S]. Beijing: China Coal Industry Publishing House,2022.

[5] Wei, L. Design of control system for mining hydraulic equipment based on PLC [D]. Master’s thesis, Dalian University of Technology],2020.

[6] Zhao, Y. D. Hydraulic transmission and control. China Machine Press. (Original work published in Chinese, 2018: 150–165.

[7] National Standard of the People’s Republic of China. Explosive atmospheres-Part 1: General requirements for equipment (GB/T 3836.1-2021).

[8] Li, D. M., Zhu, S. M., Zhao, Y. Z., et al.Research on electro-hydraulic control system for automatic anti-jamming drilling in coal mines [J]. Journal of Chongqing University, 2022,45(2), 114–124.

[9] Zhang, X. P., Xie, P., & Fu, J. G. Design and research of a modular IoT electric-driven sand mixing skid. Plant Maintenance Engineering, 2022(21), 24–26.

[10] Jia, B. Y., Chen, D. D., Sun, S. Q., et al. A closed high-pressure hydraulic cyclone continuous sand mixing and supply device and system for underground coal mines, Patent No. CN215654747U, 2022.

[11] Sun, Y. F., Liu, Z. Q., Wang, Z. B., et al. Performance test and simulation analysis of mining high-pressure large-flow electro-hydraulic proportional valves. Hydraulics & Pneumatics, 2023,47(2), 89–96.

[12] Wang, G. F., Du, Y. B., Meng, X. J., et al. Research and prospect of electro-hydraulic control system for intelligent hydraulic supports in coal mines. Coal Science and Technology,2021,48(7), 1–9.

[13] Li, Y. Research on cooperative control method for electro-hydraulic control system of hydraulic support groups based on industrial Internet [D], Master’s thesis, Taiyuan University of Technology,2021.