Moisture is an important property of coal, as all coals are mined wet. … Moisture held within the coal itself is known as inherent moisture and is analysed quantitatively. Moisture may occur in four possible forms within coal: Surface moisture: water held on the surface of coal particles or macerals.
How do you calculate inherent moisture in coal?
Total moisture =X+Y*(1-X/100), Where, X: percentage loss in mass of original in air-drying, Y: percentage loss in mass of air dried sample on oven drying.
What is moisture content in coal?
Moisture content is an important parameter in coal analysis. It is needed for determining the calorific (heating) value and handling properties of a coal. … This measured result is termed residual moisture (see below). This is the moisture value used for calculating other analytical results to a dry basis.
What is volatile coal material?
Volatile matter is one of the most common parameters measured in coal. … It is measured as the weight percent of gas (emissions) from a coal sample that is released during heating to 950 C° in an oxygen-free environment , except for moisture (which will evaporate as water vapor), at a standardized temperature.
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.
Does coal absorb moisture?
Charcoal will absorb moisture from the air. … Place charcoal in the can and put the lid on. Place in the areas of your house that get the most humidity, such as bathrooms, basements, closets, attics or sun rooms.
What is the difference between GCV and NCV of coal?
Gross calorific value (GCV) is the amount of heat released by the complete combustion of a unit of natural gas. … Net Calorific Value (NCV) also known as lower heating value (LHV) or lower calorific value (LCV) is determined by the subtracting the heat of vaporization of the water vapour from the higher heating value.
What is GCV of coal?
The gradation of non-coking coal is based on Gross Calorific Value (GCV), the gradation of coking coal is based on ash content and for semi coking /weakly coking coal it is based on ash plus moisture content, as in vogue as per notification.
How do you remove moisture from coal?
The most appropriate suggestible option for removal of moisture from coal, without using any type of fuel for heat generation, is by ‘Solar Drying’, by an application of Solar Glass House along with a Churning machine for regular and even mixing of newer and older coal.
Does coal ash contain mercury?
Coal contains trace levels of trace elements (such as arsenic, barium, beryllium, boron, cadmium, chromium, thallium, selenium, molybdenum and mercury), many of which are highly toxic to humans and other life.
Is coal a ash?
Coal ash is the waste that is left after coal is combusted (burned). It includes fly ash (fine powdery particles that are carried up the smoke stack and captured by pollution control devices) as well as coarser materials that fall to the bottom of the furnace. Most coal ash comes from coal-fired electric power plants.
How many types of coal are there?
How is coal formed?
Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.
How do you calculate moisture?
The amount of water is determined by subtracting the dry weight from the initial weight, and the moisture content is then calculated as the amount of water divided by the dry weight or total weight, depending on the reporting method.
What is the critical moisture content?
The critical moisture content (average material moisture content at the end of the constant-rate-drying period) is a function of material properties, the constant-rate of drying, and particle size. … A change in material handling method or any operating variable, such as heating rate, may effect mass transfer.
What is bound moisture?
Definition of ‘bound moisture’
Bound moisture is liquid in a solid, which exerts a vapor pressure that is less than the pure liquid would do at the same temperature. Bound moisture can only be removed under particular conditions of humidity and temperature in the external surroundings.