at a given fineness, at a given Hardgrove grindability index (HGI), at a given raw coal sizing entering the mill and at a given coal moisture content Throughput alone is NOT a definition of pulverizer capacity! Please read on for more explanation Predicting Pulverizer Performance Often ,...

Mar 17, 2013· Hi ! I want to know the defination of HARDGROVE GRINDABILITY INDEX of coal and what is the effect of HGI on coal pulverisation Please come into a discussion We are now facing PF leak problem in our power plant as well as excessive mill wear _____...

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Hardgrove Grindability Index (short HGI) is a measure for the grindability of coal , Grindability is an important factor for the design a coal mill Live Chat; Hardgrove Grindability Index (HGI) & Standard , The Hardgrove Grindability Index Standard Reference Sample (HGI-SRS) is a sample of coal used to calibrate instruments that are designed ....

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CONTRIBUTION TO DETERMINATION OF COAL GRINDABILITY USING HARDGROVE METHOD P , index specified by sample impact testing This is associated with the fact that in impact tests relatively large , in determination of grindability can therefore lead to proposal of non-corresponding performance of particularization devices, which may ....

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The grindability and strength values of each sample having different moisture content were determined by Hardgrove grindability index (HGI), ball mill grinding test and Impact strength index (ISI ....

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UNIT 1 HARDGROVE GRINDABILITY INDEX (continued) Conversely at a constant HGI the fineness of the product varies with mill capacity Below rated capacity the mill produces coal with a higher proportion less than 75 microns and above rated capacity it produces coal with a lower proportion less than 75 microns FiGure 4 Product fineness vs mill ....

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Effect of Grindability The grind ability of the coal is an empirical index It is not an inherent property of coal Relative ease of grinding as compared with standard coal It is determined in laboratory using 50 g of air dried sample of properly sized coal in a miniature pulveriser which is set to rotate exactly 60 revolutions grinding the coal sample...

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