On what basis the calorific value of coal depends?
On what basis the calorific value of coal depends?
The calorific value of a coal depends upon its grade and its chemical composition. The chemical composition of the coal is usually defined in terms of proximate analysis and Ultimate analysis. The variables of proximate analysis are fixed carbon, moisture, ash and volatile matter.
What does calorific value depend on?
Calorific value depends directly on the methane content of LFG, i.e., the higher the methane content, the greater the calorific value. As defined in previous sections, the composition of LFG varies with the age of the landfill, therefore calorific value also varies along with its composition.
What is the calorific value of coal?
The calorific value of coal is in the range of 25–35 MJ/kg. There are three main types of coal: lignite, bituminous coal and anthracite. Anthracite is the highest quality coal, as it has a carbon content of more than 90% and the highest calorific value.
What increases calorific value of coal?
The simplest way to increase the calorific value of coal sludge and floatation tailings is to lower their water and ash contents. The humidity of fine coal waste from current production is largely in uenced by the applied dewatering installations, where the filtration presses proved the most effective.
What is calorific value Class 8?
Calorific value is defined as the amount of heat energy released during complete combustion of a unit mass of a fuel. It is expressed in kJ/kg.
What is calorific value Class 11?
The amount of heat energy generated on complete combustion of 1 kg of a fuel is known as its calorific value.
What is calorific value?
Definition of calorific value : the heat produced by the combustion of a unit weight of a fuel.
What is calorific value explain types?
The 2 types of calorific values are: Higher Calorie Value or the Gross Calorie Value(GCV): When 1 kg of fuel is burned and cooled down to room temperature, the heat obtained is the GCV. Lower Calorie Value or the Net Calorie Value(NCV): When 1 kg of fuel is burned, the heat obtained is the NCV.
What is high calorific coal?
Anthracite (“coal-like”) is a hard, very low content of volatile compact variety of coal that has a high luster. It has the highest carbon content (between 92.1% and 98%), the fewest impurities, and the highest calorific content of all types of coal, which also includes bituminous coal and lignite.
What is calorific value of thermal coal?
Coal is very shiny, repels moisture, calorific value 7,800 – 8,000 kcal/kg, no coking properties. Most coal is used for the energy content contained within the volatile matter and the fixed carbon. These coals are generically termed thermal or steam coals. These coals are mostly used for electricity generation.
Which factors affect quality of coal?
The chemical and physical properties of coal are strongly affected by the upgrading process employed. For high-moisture coals, upgrading involves thermal dehydration to improve the calorific value of the coal on mass basis.
What is calorific value answer?
Calorific value is the amount of heat energy present in food or fuel and which is determined by the complete combustion of specified quantity at constant pressure and in normal conditions. It is also called calorific power. The unit of calorific value is kilojoule per kilogram i.e. KJ/Kg.