# How do you calculate surface moisture of coal?

Contents

## 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