GB 15224.3-2022
Coal Quality Classification Part 3: Calorific Value (English Version)
- Standard No.
- GB 15224.3-2022
- Language
- Chinese, Available in English version
- Release Date
- 2022
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB 15224.3-2022
- Scope
- This document stipulates the classification, naming and inspection of coal calorific value according to the dry basis high calorific value (Qgr,d) range. This document is suitable for coal resource exploration and evaluation, and guides coal production, processing and utilization.
- Introduction
Technical evolution of the new calorific value standard
This revision highlights three major improvement directions: sampling precision, indicators segmentation, and application scenario. It focuses on standardizing the requirements for taking coal samples from coal seams, adding a sampling process that complies with the MT/T1090 standard, and improving the domestic coal resource evaluation system.
Six-level classification system for calorific value
Grade code Title Heat value range(MJ/kg) SHQ Extra high calorific value coal >30.90 HQ High calorific value coal 27.21-30.90 MHQ Medium and high calorific value coal 24.31-27.20 MQ Medium calorific value coal 21.31-24.30 MLQ Medium and low calorific value coal 16.71-21.30 LQ Low calorific value coal ≤16.70
Analysis of key revision points
The 2022 version makes major adjustments in the coal sampling processing link: emphasizing the standardized taking of coal seam coal samples (in accordance with GB/T482), canceling the guidelines for the taking of commercial coal samples, and strengthening the guidance of resource exploration. The case shows that after the implementation of the new standard, the measurement error rate in a mining area in Xinjiang decreased by 2.7%.
Quality Inspection Implementation Procedures
The inspection process implements a dual-link routing guarantee mechanism: the first link implements GB/T213 to determine calorific value, and the second link is prepared and verified through GB/T19494.2. The operation case shows that the reproducibility of the results of laboratories using the new preparation standard has increased to 98%.
GB 15224.3-2022 history
- 2022 GB/T 15224.3-2022 Classification for quality of coal—Part 3: Calorific value
- 2010 GB/T 15224.3-2010 Classification for quality of coal.Part 3:Calorific value
- 2004 GB/T 15224.3-2004 Classification for coal quality Part 3:Calorific value
- 1994 GB/T 15224.3-1994 Classification for quality of coal--Classification for calorific value of coal