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Wes Peterson
Improving Grain Dryer Efficiency
Methodology
Maintenance
Operations
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0 5 10 15 20 25 30 35 40 45 50
DRY BULB TEMPERATURE - °C
5
10
15
20
25
30
0 5 10 15 20 25 30 35 40 45 50
55
60
65
70
75
80
85
90
95
100
105
110
110
115
115
120
120
125
125
130
300
305
310
315
320
325
330
335
340
345
350355
360
365
370
375
385
390
395
400
405
410
415
420
425
430
435440
445
450
455
460
470
475
480
485
490
495
500
505
510
515
520525
530
535
540
545
555
560
565
570
575
580
585
590
595
600
EN
TH
AL
PY
- K
J P
ER
KG
OF
DR
Y A
IR
10
15
20
25
30
35
40 45
50
55
60
65
70
75
80
85
90
95
100
105
EN
TH
ALP
Y - K
J PER
KG
OF D
RY A
IRSATU
RATIO
N T
EM
PER
ATU
RE - °C
0
5
5
10
10
15
15
20
20
25
25
30 WET BULB TEMPERATURE - °C
30
10% RELATIVE HUMIDITY
20%
30%
40%
50%
60%
70%
80%
90%
.78
.80
.82
.84
.86
.88
.90 S
PE
CIF
IC V
OLU
ME
m³/kg
OF
DR
Y A
IR
.92
.94
HU
MID
ITY
RA
TIO
- G
RA
MS
OF
MO
IST
UR
E P
ER
KIL
OG
RA
M O
F D
RY
AIR
PSYCHROMETRIC CHARTSea LevelBAROMETRIC PRESSURE 760 mm of Mercury
Linric Company Psychrometric Chart, www.linric.com
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
VA
PO
R P
RE
SS
UR
E -
MM
OF
ME
RC
UR
Y
-40
-20
-10
0
10
20
25
30
DE
W P
OIN
T -
°C
0 5 10 15 20 25 30 35 40 45 50
Dry Bulb Temperature (ºC)
0 5
1
0 1
5 2
0 2
5 3
0
Hu
mid
ity R
ati
o –
Gra
ms
of
Mo
istu
re p
er
Kil
og
ram
of
Dry
Air
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BTU= CFM X Temperature Rise X1.1
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Maintenance Procedures
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• Plugged Exhaust Screen
Frosted/Plugged
Air Inlet
Reduced Air Flow
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Plugged Exhaust Screens
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Plugged Exhaust
Reduced Air Flow
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Air Flow Has
Changed
Structural Failure
Grain Column Now Wider
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Gap At Fan Outlet
Reduced Airflow To Grain
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Fines Build-up
Fines Can Add To Combustion
• Grain In Air Space
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Wet Grain At Dryer Top Never Gets Dry
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Plugged Grain Turner
Reduced Grain Flow
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Air Flow & Burner Problems
Loose Duct Sheet • Moisture Covering Burner
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Burner Ports Plugged It Was Left Uncovered
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Not All Burner Parts Are In Place
Evidence Of Tall Flame On Side
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Cracked Burner Causes Uneven Flame
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Burners Needing Repair
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Cleaned
Venturi Air Inlet
Plugged
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Vertical Fired
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Up-Fired Low Pressure Burners
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Water by Expensive
Controls
Burner Not Covered
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Water Running Out Of Fuel Manifold
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If You Smell Gas, It Is Leaking!
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8.7.2.3
Means for testing all fuel gas safety shutoff
valves for valve seat leakage shall be installed.
NFPA 86
Standard For Ovens & Furnaces
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While keeping mechanical and electrical
equipment in safe and working order can be a
learned behavior….some learn better than
others
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Operators Manual
Routine operational guidelines include
understanding the manual…
• Sometimes just knowing where it is ...is a start
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Highlight or reproduce periodic maintenance
schedules outlined in manuals
Most manuals will have them scheduled
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Tech Training
Discipline yourself and/or staff to follow it correctly
Value of experienced operators “not a rookie thing”
PRODUCE YOUR OWN CHECKLIST CONSISTENT WITH YOUIR FACILITY • Have this done by your experienced operators. Value the experienced
operators
High temp dryer is not for inexperienced operators
Provide advanced technical training…manufacturer or dealer support can help you with this
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Maintenance is more than just houskeeping
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MAINTENANCE OR SUBSISTANCE
Value of true maintenance versus fixing to get by
Inspections based on four values
• Cleanliness – is the equipment or component clean?
• Functionality – is the equipment or component functional?
• Integrity – is the equipment or component in good working order?
• Safety – is the equipment or component safe?
• Can equipment be safe but not clean?
• Can equipment lack integrity but be functional?
• Can equipment be functional, yet not safe?
• Etc.
An inspection with these values in mind will always identify a fault and determine the priority of the repair
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Make fuel train a completely separate
inspection and report
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Maxon NP3 Low Pressure High Efficiency Burner
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BE SAFE!!!!!!
Thank you
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