What is HGI value of coal?
The Hardgrove Grindability Index Standard Reference Sample (HGI-SRS) is a sample of coal used to calibrate instruments that are designed to determine the ease with which coal can be pulverized. The HGI value provides information for determining grinding power consumption and pulverizer capacities.
How is HGI calculated?
The formula HGI=105-R(1.16+0.002R) 00.4 A, may be used for estimating H.G.I. for preliminary selection of coals for pulverized fuel fired furnaces.
How do you calculate HGI of coal?
The HGI grindability value is calculated from the following formula: HGI = 13+6,93(50-m) The m value is the weight of oversize expressed in grams. The Hardgrove grindability index value is influenced by petrographic composition of coal.
What is HGI of bituminous coal?
3.1 Hardgrove Grindability Index (HGI) HGI measures the ease of size reduction of a coal. HGI is generally related to coal rank -increasing with rank through the bituminous range but decreasing rapidly above 90%C (daf) in the anthracitic range.
What is HGI of Indian coal?
The Hardgrove Grindability Index (HGI) is a measure of coal’s resistance to crushing. Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will perform in their mills, allowing them to estimate grinding power requirements and throughput capacities.
What does HGI mean?
Summary of Key Points
|Definition:||How Goes It?|
|Guessability:||4: Difficult to guess|
|Typical Users:||Adults and Teenagers|
Which type of coals have the highest grindability index?
4. Which type of coals have the highest grindability index? Explanation: Grindability is the ease with which a coal can be grounded. The grindability index of pulverised coal is about 100.
What is HGI petcoke?
The Hardgrove Grindability Index (HGI) is a measure of coal’s resistance to crushing. Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will perform in their mills, allowing them to estimate.
Which coal has the highest volatile matter Mcq?
3. Which of the coal have the best heating values in terms of volatile matter? Explanation: Coals containing high volatile matter produces long and smoky flame due to which its heating value decreases. Semi-bituminous coal has the highest heating value due to less volatiles content.
Which type of coals are non caking in nature?
Only bituminous type of coal can be coked. Explanation: Only that coal which has tendency to soften, swell and stick together during strong heating in absence of air can be coked. This property is found only in the bituminous type of coal.
What is abrasive index of coal?
Abrasiveness Index is the measure of how the coal sample abrades the equipment during its utilization in electricity generations, and this value is measured by the change in mass loss of the steel blade. Abrasiveness Index of coal is then measured in milligrams of weir blades per kilograms of coal processed.