GB/T 23810-2021Commercial coal quality—Coal for direct liquefaction (English PDF)

4.1 General

Coal for direct liquefaction is classified according to volatile content, classified according to hydrogen-carbon atomic ratio and ash content index, and expressed in the form of "category + hydrogen-carbon atomic ratio grade + ash content grade".

4.2 Product category

Coal for direct liquefaction is divided into two categories according to coal type, namely lignite for direct liquefaction and bituminous coal for direct liquefaction. The abbreviated codes are YH-HM and YH-YM, respectively. The coal types are mainly long flame coal, non-stick coal, weakly sticky coal and gas coal in lignite and bituminous coal. The coal category is determined according to GB/T 5751.

4.3 Quality requirements

4.3.1 Hydrogen-carbon atomic ratio grade

Coal for direct liquefaction is divided into two grades according to the hydrogen-carbon atomic ratio (H/C) index, namely (H/C) grade 1 and (H/C) grade 2; for the corresponding hydrogen-carbon atomic ratio index requirements for each product grade, see Table 1.

5.1 Ash and volatiles

The determination of ash and volatiles of coal shall be carried out in accordance with

GB/T 212 or GB/T 30732. The ash content of coal shall be arbitrated in accordance with the slow ashing method in GB/T 212.

5.2 Carbon and hydrogen contents

The determination of carbon and hydrogen contents in coal shall be carried out in accordance with GB/T 476 or GB/T 30733.

5.3 Total moisture

The determination of total moisture in coal shall be carried out in accordance with GB/T 211.

5.4 Phosphorus content

The determination of phosphorus content in coal shall be carried out in accordance with GB/T 216.

5.5 Chlorine content

The determination of chlorine content in coal shall be carried out in accordance with GB/T 3558.

5.6 Arsenic content

The determination of arsenic content in coal shall be carried out in accordance with GB/T 3058.

5.7 Mercury content

The determination of mercury content in coal shall be carried out in accordance with

GB/T 16659 or SN/T 3511.

5.8 Grindability index

The determination of grindability index of coal (Hardgrove method) shall be carried out in accordance with GB/T 2565.

5.9 Inertinite content

The determination of inertinite content shall be carried out in accordance with GB/T 8899.

e) When national or local quality supervision and management department proposes a requirement for type inspection.

6.5 Determination rules

The quality of coal for direct liquefaction shall be determined in accordance with the provisions of Table 3; when both the delivery inspection and type inspection results are qualified, determine the batch of products qualified.

7.1 Identification

7.1.1 Commercial coal produced and sold shall be identified according to the provisions of GB/T 25209.

7.1.2 Identification, as a document accompanied the circulation of commercial coal, shall include, but is not limited to, the following:

-- product name;

-- quantity:

-- place of origin;

-- nominal maximum particle size and appearance description;

-- main coal quality indexes: including but not limited to the indexes specified in Chapter 4;

-- others: name and address of the producer or the dealer, production date, lot number, document number, etc.

7.1.3 Identification shall be made of waterproof, anti-corrosion, and not-easy-to-damage materials.

7.2 Transportation and storage

The transportation and storage of coal for direct liquefaction shall be dust-proof, rain-proof, moisture proof, and away from fire.