How do you calculate surface moisture of coal?

What is equilibrated moisture of coal?

The moisture content retained at equilibrium in an atmosphere over a saturated solution of potassium sulfate at 30 degrees C, and 96% to 97% relative humidity.

What is the temperature required to find out moisture in coal?

Air-dry loss moisture, which is not linked to organic matter, is the loss of weight resulted by drying at room temperature. Inherent moisture content is determined by heating an air-dried coal sample at 105°–110°C (221–230°F) under specified conditions until a constant weight is obtained.

What is TM in coal?

includes Total Moisture (TM) Air Dried (ad): includes Inherent Moisture (IM) only. Dry Basis (db): excludes all Moisture.

What is equilibrated moisture?

n) “Equilibrated Moisture” means moisture content, as determined after equilibrating at 60% relative humidity (RH) and 40 degree Celsius as per the relevant provisions (relating to determination of equilibrated moisture at 60% RH and 40 degree Celsius) of BIS 1350 of 1959 or amendment thereof.

How many types of coal moisture are there?

Moisture may occur in four possible forms within coal: Surface moisture: water held on the surface of coal particles or macerals. Hygroscopic moisture: water held by capillary action within the microfractures of the coal. Decomposition moisture: water held within the coal’s decomposed organic compounds.

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Is moisture in coal wasteful?

Moisture absorbs heat, so high moisture content in coal reduces the relative efficiency of heating when a coal is combusted. This is why low-rank, high-moisture coals have lower calorific values (Btu/lb) than high-rank, low-moisture coals.

What is the difference between total moisture and inherent moisture in coal?

Inherent or equilibrium moisture is used for calculating moist mineral-matter-free calorific values for the rank classification of high-volatile bituminous coals. It is also used for estimating free or surface moisture, since total moisture is equal to the sum of the inherent moisture and the free moisture.

What is the ash content of coal?

Ash content of coal produced in the country is generally 25 to 45 % whereas average ash content of imported coal varies from 10 to 20 %. Indian Coal has comparatively higher ash content than imported coal due to drift theory of formation of coal deposits in India.

What is the formula of coal?

The chemical formula of coal is reported as: C135H96O9NS. Coal is usually taken as 85% carbon based on dry mass.

How do you calculate coal?

Mining Coal Calculations

  1. AD factor (converts AD to Nominated Moisture (NM)): (100-NM)/(100-ADM) NM = AD / ((100-NM)/(100-ADM))
  2. Dry factor (converts AD to Dry) (100-ADM)/100. Dry = AD / ((100-ADM)/100)
  3. AR factor (converts Dry to AR): (100-TM)/100. …
  4. DAF factor (converts Dry to DAF): (100-Dry Ash)/100.

What is the principle of moisture content?

The principle of the thermogravimetric method of moisture content determination is defined as the weight loss of mass that occurs as the material is heated. The sample weight is taken prior to heating and again after reaching a steady-state mass subsequent to drying.

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