Graining Volume Calculation in Batch Pan | Sugar Process Tech

In this article, the concepts of the Graining volume in batch pan and example for calculation of the graining volume are discussed.

The Concept of Graining Volume of the Batch Pan

The graining volume is the volume of the pan up to the level of the top tube plate, the minimum volume at which the pan can operate.

This term “Graining Volume” is used to denote the minimum volume of massecuite, which must be introduced in to the pan before opening of steam valve. It is calculated corresponding to the upper surface of top tube plate. It is also referred as ‘footing volume’ of the pan.

Graining volume generally expressed in percent of the working volume of the that pan. It is varies from 35 to 45%. Generally, all types of massecuites graining made with higher purity syrup or molasses and afterward pan is filled with low purity material. So lower graining volume is obviously of advantage for better purity control of massecuite. Also low graining volume is helps to increase the crystal size.

However some massecuites graining material preparation and developing of the massecuite with same material. In such situation, the % graining volume is not necessary to be considered for purity reduction.

Present scenario to improve the circulation of the pan use short length tubes . If tube length of pan decreases, then increase in the calendria diameter for the pan with same heating surface. The increase in calandria diameter increases the graining volume of pan.

In case of 800 mm tube length pans, the graining volume increases upto 40 % to 42%. Such pans definitely give higher circulation in pans.

The Graining volume of the batch pan calculated by adding these volumes in pan

a) Bottom cone volume

b) Bottom ring volume

c) Total tubes volumes

d) Down take Volume

e) Volume of the pan upto 50mm height from top tube plate (It may not be required to add this volume while calculating the graining volume)

Example of calculation of graining volume single discharge type:

 Graining Volume of Batch Pan Sl.no. Description Formula Values UOM Input Data 1 Capacity of pan 60 T 2 No. of tubes N 1306 nos. 3 Tube thickness t 1.6 mm 4 Tube Length H1 750 mm 5 Tube OD OD 102 mm 6 Dia of pan D1 5600 mm 7 Dia of the down take D2 2400 mm 8 Height of the bottom ring H2 50 mm 9 Angle of bottom cone α 18 Deg 10 Discharge Dia D3 600 mm Graining Volume Calculation 1 ID of the tube ID = OD – 2xt 98.8 2 Volume of massecuite in tubes Q1 = 0.785 x ID x ID x H1 x N 7.51 M3 3 Volume of down take Q2 = 0.785 x D2 x D2 x H1 3.39 M3 4 Volume of the bottom ring Q3 = 0.785 x D1 x D1 x H2 1.23 M3 5 Height of the bottom cone h = [(D1 – D3)/2 ] x TAN α 812.30 mm 6 A1= 0.785 x (D1)2 24.62 M2 7 A2= 0.785 x (D3)2 0.28 M2 8 Volume of the bottom cone Q4 = h/3 (A1+A2+√A1A2) 7.46 M3 9 Graining Volume Q1+Q2+Q3+Q4 19.58 M3

Example of calculation of graining volume “W” type cone

 Graining Volume of Batch Pan (“W” Type cone ) Sl.no. Description Formula Values UOM Input Data 1 Capacity of pan 60 T 2 No. of tubes N 1306 nos. 3 Tube thickness t 1.6 mm 4 Tube Length H1 750 mm 5 Tube OD OD 102 mm 6 Dia of pan D1 5600 mm 7 Dia of the down take D2 2400 mm 8 Dia of bottom inverted cone D3 2200 mm 9 Height of the bottom ring H2 50 mm 10 Angle of bottom cone α 18 Deg 11 Angle of bottom inverted cone Φ 35 Deg Graining Volume Calculation 1 ID of the tube ID = OD – 2t 98.8 2 Volume of massecuite in tubes Q1 = 0.785 x ID x ID x H1 x N 7.51 M3 3 Volume of down take Q2 = 0.785 x D2 x D2 x H1 3.39 M3 4 Volume of the bottom ring Q3 = 0.785 x D1 x D1 x H2 1.23 M3 5 Height of the bottom cone h 1 = [(D1 – D3)/2 ] x TAN α 552.36 mm 6 A1= 0.785 x (D1)2 24.62 M2 7 A2= 0.785 x (D3)2 3.80 M2 8 Volume of the bottom cone Q4 = h/3 (A1+A2+√A1A2) 7.01 M3 9 Height of the bottom inverted cone h2 = [( D3)/2 ] x TAN Φ 770.23 mm 10 Volume of inverted cone Q5 = 1/3 x 0.785 x (D3)2 h2 0.98 M3 11 Graining Volume Q1+Q2+Q3+Q4 – Q5 18.17 M3

Online Calculator for calculating the Graining Volume in Batch pan

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13 thoughts on “Graining Volume Calculation in Batch Pan | Sugar Process Tech”

SARVENDRA KUMAR SRIVASTAV

(July 17, 2019 - 4:28 am)

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siva alluri

(July 31, 2019 - 4:07 pm)

welcome Mr.SARVENDRA KUMAR SRIVASTAV

Bandu chaure

(August 9, 2019 - 9:06 am)

It is very helpful knowledge for me
Thanks sir

siva alluri

(August 13, 2019 - 2:44 pm)

Welcome Bandu chaure

Shantaram Ramchandra Sahane

(February 9, 2020 - 7:33 am)

Please provide a desine calculations of Sulphur burner

Shantaram Ramchandra Sahane

(April 16, 2020 - 8:36 am)

Desine calculations for Sulphur burner

Rakesh Kumar

(August 21, 2021 - 12:34 am)

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Rakesh Kumar

(August 21, 2021 - 12:37 am)

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siva alluri

(September 2, 2021 - 8:26 am)

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Baraza

(January 8, 2022 - 5:54 am)

Size of grain /B/C/and mass/A/B/C/seed

R.NAMASIVAYAM

(September 15, 2023 - 10:56 am)

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siva alluri

(September 17, 2023 - 1:31 pm)

Thank you