The classification of coal is very complicated. There are many types of coal classified according to different classifications such as volatile content, caking index, ash content, S, etc. I suggest you study it in detail.
According to the indicators you provided: According to the ash content, it is seventeenth-level thermal coal, and according to S, it is low-sulfur coal.
The following is the collected information for reference:
Characteristics of various types of coal in China's National Coal Classification Standard
The newly formulated China National Coal Classification Standard first classifies all coal into lignite, bituminous coal and anthracite according to the degree of coalification. For lignite and anthracite, they are divided into 2 and 3 subcategories according to their degree of coalification and characteristics of industrial utilization. The bituminous coal part is divided into low, medium, medium-high and high volatile bituminous coal according to four stages of volatile matter greater than 10-20%, greater than 20-28%, greater than 28-37% and greater than 37%. Regarding the caking property of bituminous coal, it is distinguished by the caking index G: 0 to 5 is non-caking and slightly caking coal. If it is greater than 50 to 65, it is moderately strong caking coal, and if it is greater than 65, it is strongly caking coal. For strongly caking coal, coals in which the maximum thickness y value of the colloid layer is greater than 25mm or the Ouya expansion degree b is greater than 150% (for bituminous coal with Vdaf greater than 28%, b is greater than 220%) is defined as extra strong caking coal. . In this way, the bituminous coal part can be divided into 24 units and represented by corresponding numbers. Among the ten digits of the number, 1 to 4 represent the coalification degree of the coal, and among the single digits of the number, 1 to 6 represent the caking property of the coal. Among these 24 units, some units were merged into 12 categories based on the classification principle that the properties of similar coals are basically similar and the properties of different coals are greatly different. Regarding the naming of coal types, taking into account the continuity and customary naming of the old and new classifications, eight coal types are still retained: gas coal, fat coal, coking coal, lean coal, lean coal, weak caking coal, non-caking coal and long flame coal.
In order to make the properties of the same type of coal basically the same, the new national coal classification standard adds four transitional coal types: lean coal, 1/2 medium caking coal, 1/3 coking coal and gas-fat coal. Lean coal refers to lean coal with poor cohesion to distinguish it from typical lean coal. 1/2 caking coal is composed of part of the weak caking coal with good caking property in the original classification and part of the flying coke coal and fat gas coal with poor caking property. 1/3 of the coking coal is composed of some of the fat gas coal and fat coking coal with better cohesiveness in the original classification. This type of coal is a transitional coal between coking coal, fertile coal and gas coal. It also has some properties of these three types of coal, but it is recognized that it has better coking properties. Gas-fat coal belongs to the category of fat coal in the original classification, but its coking property is much worse than that of typical fat coal, so the new national coal classification standard lists it as a separate category. This overcomes the shortcomings of large differences in properties of similar coals in the original classification scheme. For example, Gas Coal No. 1 and Fei Gas Coal No. 2 are obviously different in nature, so it is unreasonable to classify them as the same category. The new national classification standard classifies these coals with transitional properties into a separate category, which is conducive to the rational use of coal.
The new national classification standards describe several characteristics of various types of coal as follows:
1. Anthracite (WY)
Low volatile matter, high fixed carbon, The specific gravity of pure coal is up to 1.90. It has a high ignition point and does not emit smoke when burned. This type of coal can be divided into: No. 01 is old anthracite; No. 02 is typical anthracite; No. 03 is young anthracite. Anthracite is mainly used for civil use and as a gas-making raw material for manufacturing synthetic ammonia. It has low ash, low sulfur and good grindability. Anthracite can not only be used as fuel for blast furnace injection and sintered iron ore, but can also be used to make various carbon materials, such as carbon electrodes, anode pastes and activated carbon raw materials. Some high-quality anthracite can also be used to make aviation briquettes. For insulation of aircraft engines and vehicle motors.
2. Lean coal (PM)
The highest degree of metamorphosis, bituminous coal, is non-adhesive or weakly adhesive, does not coke in the layered coke oven, and has a short flame when burning. , resistant to burning, mainly used as fuel for power generation, and can also be used as coal blending for civil and industrial boilers.
3. Lean coal (PS)
Highly metamorphic, low-volatile bituminous coal with weak cohesion has worse coking properties than typical lean coal. When coking alone, it produces Very little burnt powder. If a certain proportion of this coal is added to the coking coal blending, it can also have a slimming effect. This coal can also be used as fuel for power generation, civil use and boilers.
4. Lean coal (SM)
Low-volatility, medium-cohesive coal for coking. A considerable amount of pyromass can be produced during the coking process. When coking alone, coking coal with large lumps, few cracks, and high crushing strength can be obtained. However, the wear resistance of this coke is slightly poor, but the use of 2 coking coal blends has better effects. This kind of coal can also be used as fuel for power generation and general boilers, and can also be used for blending and burning in railway locomotives.
5 Coking coal (JM)
Bituminous coal with medium or low volatility and medium or strong cohesiveness produces a colloid with high thermal stability when heated. If used for coking alone, coking coal with large lumps, few cracks and high crushing strength can be obtained. The wear resistance of this coking coal is also very high. However, when coking alone, due to the large expansion pressure, it is easy to cause difficulty in pushing coke. It is generally used as a coal blender for coking, and the effect is better.
6. 1/3 coking coal (1/3JM)
A medium-high volatile, strongly caking coal, which is a transitional coal type between coking coal, fat coal and gas coal. , coking coal with good meltability and high strength can be produced during coking alone. The amount of this coal added during coking can fluctuate within a wide range, but coke with high strength can be obtained. 1/3 coking coal is also good. Basic coal used in coking coal blending.
7. Fat coal (FM)
Medium to medium-high volatile and strong cohesive bituminous coal can produce a large amount of colloid when heated. When fat coal is coked alone, it can produce coke with good meltability and high strength. Its wear resistance is also better than that of coke produced from coking coal, so it is the basic coal in coking coal blending. However, when coking alone, there are more transverse cracks on the coke, and there is often bee char in the coke root.
8. Gas fertilizer coal (QF)
A kind of strong cohesive fertilizer coal with high volatile matter and colloid thickness. Some people call it "liquid fertilizer coal" . The coking property of this coal is between that of fat coal and gas coal. Coking alone can produce large amounts of gaseous and liquid chemical products. Gas fertilizer coal is most suitable for high-temperature carbonization to produce coal gas, and can also be used for coal blending and coking to increase the yield of chemical products.
9. Gas coal (QM)
A coking coal with a low degree of deterioration. When heated, more volatile matter and more tar can be produced. The thermal stability of the colloid is lower than that of fat coal, and it can be coked alone. However, the crushing strength and wear resistance of the coke are slightly worse than other coking coals, and the coke is mostly long and brittle, and has more of longitudinal cracks. Adding more gas coal during coal blending and coking can increase the gasification rate and chemical product recovery rate. Gas coal can also be used for high-temperature carbonization to produce city gas.
10. 1/2 medium caking coal (1/2ZN)
A medium-caking medium-high volatile bituminous coal. Some of this coal can produce coke of a certain strength when coking as a single coal, and can be used as a type of coal for blending and coking; the other part with weak cohesion will produce coke with poor strength and a high powder coke rate when coking alone. Therefore, 1/2 of the medium-caking coal can be used as gasification coal or power coal, and can also be added in appropriate amounts during coal blending and coking.
11. Weakly caking coal (RN)
A low-to-medium metamorphic bituminous coal with weak cohesion. When heated, less colloid is produced. During coking, some can produce small pieces of coke with poor strength, while others can only form a small part of the coke into debris, with a high powder coke rate. Therefore, this kind of coal is mostly suitable for use as gasification raw materials and power plants, locomotives and Boiler fuel coal.
12. Non-sticking coal (BN)
Most of them are low-to-moderate bituminous coals that have been subjected to considerable oxidation in the early stages of coal formation. They basically do not produce when heated. Colloidal body. This kind of coal has a lot of moisture, and some also contain a certain amount of secondary humic acid; some have an oxygen content as high as more than 10%. Non-stick coal is mainly used as coal for gasification and power generation, and can also be used as power and civil fuel.
13. Long-flame coal (CY)
The lowest degree of metamorphism, bituminous coal, ranges from no caking to weak caking. The youngest long-flame coal also contains A certain amount of humic acid is prone to weathering and fragmentation during storage.
Long-flame coal with a high degree of coalification can also produce a certain amount of colloid when heated to form fine long strips of coke, but the strength of the coke is very poor and the powder coke rate is also quite high. Therefore, long-flame coal is generally used as gas. Coal is used as fuel for chemicals, power generation and locomotives.
14. Lignite (HM)
Divided into two subcategories: old lignite with a transmittance PM greater than 30~50% and young lignite with a PM less than or equal to 30%. The characteristics of lignite are: high moisture, low specific gravity, non-caking, and containing varying amounts of humic acid. The oxygen content in coal is often as high as about 15-30%. It has strong chemical reactivity and poor thermal stability. Coal lumps are seriously broken when heated. When stored in the air, they are easily weathered, deteriorated, and broken into small pieces or even powder. The calorific value is low, and the melting point of coal ash is mostly low. Coal ash often contains more calcium oxide and lower aluminum oxide. Therefore, lignite is mostly used as fuel for power generation, and can also be used as gasification raw material and boiler fuel. Some lignite can be used to make sulfonated coal or activated carbon, and some can be used as raw material for extracting montan wax. In addition, young lignite is also suitable for making organic fertilizers such as ammonium humate, which can be used in farmland and orchards to increase production.