Contents

tool to calculate Vertical Mill heat balance by Loesche

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Loesche – Heat Balance Calculation

Fill in white cells
	Composition %	Moisture %
Limestone	40	4		5.63
Marl	50	6		11.06
Sand	7	10		2.67
Iron ore	3	7		0.78
Total	100			20.14	t/h
Mill output				379.86	t/h
Feed	400	t/h
Moisture on finish product	0.5	%

Gas Flow Balance
Inputs				Outputs
	Amount (t/h)	Nm3/h	%		Nm3/h	%
Mill inlet gas flow		330000	84.1	Mill outlet gas flow	392572	100
Water from feed	20.14	25176	6.4
Water injection	5	6250	1.6
False air		31147	7.9
TOTAL		392572	100		392572	100

In a vertical roller mill the % of false air is usely between 5 and 10%
		330000	Nm3/h on wet			392572	Nm3/h on wet
Gas coming from the kiln	270°C	307230	Nm3/h on dry	Gas temperature	100°C	346248.854	Nm3/h on dry
	%	th/h			%	th/h
CO2	26.1	9687		CO2	23.07	3363
O2	6.77	1812		O2	8.39	909
CO	0.1	26		CO	0.06	6
N2	67.2	17363		N2	68.53	7261
H20	6.9	2250		H20	11.8	1654
	100.17	31137			100.05	13193		17944	17496	-2.496

Heat balance
Inputs							Outputs
	t/h or Nm3/h	T° (°C)	kCal/Nm3	th/h	th/toutput	%		t/h or Nm3/h	T° (°C)	kCal/Nm3	th/h	th/toutput	%
			or kCal/kg							or kCal/kg
Hot gases from kiln	330000	270		31137	81.97	85.2	Gases	392572	100		13193	34.7	35.4
Mill feed	379.86	20	3.9	1481	3.9	4.1	Kiln dust	21	90	16.7	351	0.9	0.9
Water from feed	25176	20	7	176	0.5	0.5
Water injection	6250	10	3.5	22	0.1	0.1	Kiln feed	380	90	18.5	7027	18.5	18.9
False air	31147	25	7.7	240	0.63	0.7	Water vaporisation	25.14		636	15989	42.1	42.9
Kiln dust	21	270	55	1155	3.0	3.2	Convexion + radiation				702	1.8	1.9
Table motor energy				2353	6.2	6.4
TOTAL				36565	96.3	100.0	TOTAL				37263	98.1	100.0

										Difference	2	%