NB/T 11325-2023
Technical requirements for intelligent coal mine gas drainage system (English Version)

Standard No.

NB/T 11325-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

Professional Standard - Energy

Latest

NB/T 11325-2023

Introduction

Analysis of the core content of the standard

This standard specifies the full-chain technical requirements for the intelligent transformation of coal mine gas extraction systems, including 12 types of functional modules from the ground control center to underground sensors, and achieves an increase of more than 40% in gas extraction efficiency through core equipment such as intelligent extraction pumping stations and three-dimensional drilling design systems.

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Comparative Analysis of System Architecture

Functional Module	Traditional System	Intelligent System	Technological Breakthrough
Extraction Pumping Station	Manual Inspection	Unattended + AI Control	Response Time≤15s
Pipeline Network Control	Manual Valve Adjustment	Multi-point Sensing + Automatic Balancing	Negative Pressure Fluctuation≤5%
Data Management	Paper Ledger	Digital Twin + Predictive Analysis	Automated compliance assessment

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Detailed explanation of key technical indicators

1. Sensor network

The system requires the deployment of 7 types of mining sensors, including:

• Methane sensor: range 0-100%, error ±0.05% (0-1% concentration)
• Pipeline flow meter: accuracy level 1.5
• Temperature sensor: -40℃~+55℃ working range

All sensors must meet the IP65 protection level and have stability for more than 15 days.

Application Case: Intelligent Transformation Practice of a Mine

After deploying the intelligent system in a coal mine in Shanxi:

1. Extraction concentration increased from 18% to 32%
2. The frequency of manual inspections decreased by 80%
3. The response time for pipeline leakage identification was shortened to 3 minutes

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Recommendations for the implementation of the standard

Phase-based transformation path

Phase	Key tasks	Period
1. Infrastructure construction	Laying of optical fiber network and installation of intelligent sensors	3-6 months
2. System integration	Deploy ground control center and intelligent pump station	6-9 months
3. Optimize operation	Big data model training, system parameter adjustment	Continuous

It is recommended to prioritize the transformation of high-gas working faces and goaf closed systems, and the annual transformation investment should not be less than 15% of the total value of the extraction system.

Key points of operation and maintenance

• Establish a two-person inspection system and check system logs daily
• The number of spare sensors ≥ 20% of the equipment in use
• Calibrate methane sensors every 10 days

NB/T 11325-2023 Referenced Document

• AQ 1029 Coal mine safety monitoring system and testing instrument use management specification
• AQ 6201 General technical requirements for coal mine safety monitoring system
• MT/T 423 Methane calibration gas technical conditions in air

NB/T 11325-2023 history

• 2023 NB/T 11325-2023 Technical requirements for intelligent coal mine gas drainage system

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