What do these mean in coal sample analysis?

Reply: 1. Industrial analysis section ·Mar: Moisture on as-received basis. Note: As-received basis (abbreviated as AR) refers to the coal in its condition at the time of receipt. ·Mad: Moisture on an air-dried basis. Note: Air-dried basis (abbreviated as AD) refers to the coal that is in equilibrium with the air humidity. ·Aad: Ash on an air-dried basis · Vad: Volatiles on an air-dried basis · FCad: Fixed carbon on an air-dried basis. 2. Bases for coal analysis: In the conversion of industrial analysis results for coal, the following 4 bases are commonly used: ar, ad, d, and daf — representing received basis, air-dried basis, dry basis, and ash-free dry basis respectively. 3、St: Total sulfur 4、Cl: Chlorine 5、As: Arsenic

That’s basically what it means; the person above summarized it very well. Regarding other symbols used in coal quality analysis, there are also temperatures such as FT, HT, ST, DT, etc., which represent flow temperature, hemispherical temperature, softening temperature, deformation temperature, and so on. There are many more; just let me know if you want to know

Supplement: Industrial analysis, elemental analysis of coal, and analysis standards 1. Industrial analysis of coal Industrial analysis of coal, also known as technical or practical analysis of coal, serves as the basic basis for evaluating coal quality. In **standard varieties, the industrial analysis of coal involves the determination of parameters such as moisture, ash, volatile matter, and fixed carbon in coal. Generally, the moisture, ash, and volatile matter of coal are measured directly, while fixed carbon is calculated by subtraction. Broadly speaking, the industrial analysis of coal also includes the determination of the total sulfur content and calorific value of coal, which is also known as the comprehensive industrial analysis of coal. 2. Elemental analysis of coal: Elemental analysis of coal involves the detection and analysis of the elemental contents in coal (usually expressed as mass percentages). This includes the conventional elements such as C, H, O, N, S, Al, Si, Fe, Ca, etc., as well as trace elements present in coal like Ti, Na, K, etc. Elemental analysis is an important indicator for studying the degree of coal metamorphism, calculating the calorific value of coal, and estimating the products of coal carbonization; it also serves as the basis for heat calculation when coal is used as fuel in industry. 3. Analysis basis for coal: In coal quality analysis, the test results vary depending on the different coal samples. The test results for the same coal sample vary under different conditions as well. For example, the moisture content of a coal sample shows a lower value after air drying compared to the value before air drying. Therefore, any analysis or testing result must indicate the condition of the coal sample at the time of the analysis. The details are as follows: · Analysis base (ad): When conducting coal quality analysis tests, the coal sample is in an air-dried state. ·Dry basis (d): During coal quality analysis, the coal sample is in a moisture-free state. ·Received state (ar): When conducting coal quality analysis, the state of the coal sample is the same as the state in which that batch of coal was received. ·Dry ash-free basis (DAF): This state of coal samples does not exist in reality; it is an anhydrous, ash-free condition that is calculated as needed in coal quality analysis and testing. ·Anhydrous and mineral-free basis (dmmf): This state of coal samples does not actually exist in reality; it is also an anhydrous, mineral-free state that has been calculated. ·Constant humidity ash-free basis (MAF): This state of the coal sample is also calculated. Constant humidity refers to the moisture content of the coal sample (also known as the maximum intrinsic moisture) measured at a temperature of 30°C and a relative humidity of 96%.