**Contents**show

## How do you find the GCV of coal?

GCV = **76.56 – 1.3(VM + ash) + 0.0073(VM + ash)**2 In the above equation, VM and ash were in weigh percentage on dry basis and GCV was determined in mJ/kg also in dry basis.

## How do you find the GCV of fuel?

**Calculation of GCV of fuel:-**

- C+ O2 —- CO2 + 8137.5Kcal/kg of carbon.
- H2 +.5O2—-H20 + 28905 Kcal/Kg of hydrogen.
- S +O2—SO2+ 2181 Kcal/kg of Sulphur.

## How do you calculate GCV and NCV of coal?

Calculate a) Gross calorific value, moist basis b) Net calorific value, dry basis c) Net calorific value, moist basis d) Gross calorific value, dry basis using Dulong formula. = **32060.2 KJ/Kg NCV = GCV** – 24.44(9×%H + %M) = 30630.26 KJ/Kg Thus NCV = 0.955 times GCV in this case.

## How can we improve the GCV of coal?

The GCV was increased from 5,365 to 5,986 (kcal/kg) through the decrease in humidity from 80 to 29 (% R.H.) and increase in temperature from 28 to 36 (°C). This increase in GCV could be attributed to the **decrease in moisture content of** the coal from 16.2 to 7.1 (%).

## What are 4 types of coal?

Coal is classified into four main types, or ranks: **anthracite, bituminous, subbituminous, and lignite**. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.

## What is the 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.

…

Coal Grades.

GCV BAND (K.Cal./Kg.) | GRADE |
---|---|

Exceeding 2200 and not exceeding 2500 | G-17 |

## What is LCV and HCV?

A LCV is defined in the Motor Vehicles Act as **a vehicle with GVW of not more than 6 ton**. A HCV is defined as vehicle with GVW of more than 6 ton. Gross vehicle weight is defined as vehicle weight plus rated payload. Rated payload is the maximum weight permitted to be loaded on the vehicle under Motor Vehicle Act.

## What is the difference between GCV and NCV of coal?

Gross calorific value (GCV) assumes all vapour produced during the combustion process is fully condensed. Net calorific value (NCV) assumes the water leaves with the combustion products without fully being condensed.

## What is the formula of LCV?

Procedure to Calculate Calorific Value

Net Calorific Value (NCV) means lower heating value (LHV) i.e. lower calorific value (LCV) is determined by the subtraction of heat of vaporization of the water vapour from the higher heating value.

## Why NCV is less than GCV?

Answer: This is because,NCV (net calorific value) is the quantity of heat produced by combustion when the water produced by combustion remains gaseous. Since water releases heat when it condenses, **GCV is clearly bigger than NCV**.

## What is meant by Gar in coal?

GAR – Gross **As Received**. Thermal coal is quoted on a GAR basis, except for Europe/ARA, Richards Bay 6,000 kcal/kg, and Japan and Korea West CIF, which are quoted on a NAR (Net As Received) basis. … It provides a rough estimate of the heating value of coal.

## What is useful heat value of coal?

====Empirical Relationship of GCV, UHV, and NCV==== *UHV: Useful heat value = **8900 – 138(A+M)** *GCV: Gross Calorific Value = (UHV + 3645 -75.4 M)/1.466 *NCV: Net Calorific Value = GCV – 10.02M ::UHV, GCV, NCV in kcal/kg, “A” is %age Ash; “M” is %age Moisture.

## What are the types of coal analysis?

**Some of the Common Tests conducted on Coal include**

- Calorific value(Gross/net)
- Proximate analysis- Moisture,Volatile matter, Ash and Fixed Carbon.
- Ultimate analysis – C,H, O, N, S and Ash.
- Ash analysis – Al2O3, SiO2, CaO, MgO,TiO2, Na2O, K2O, S etc.,
- Ash Fusion Temperature.
- Coke Reactivity.
- Hard-grove Grindability Index.