Three Pass Dryer


Three pass rotary dryer

Three pass rotary dryer can be used for saw dust,wood chips,straw,wood sheaving, Medicago sativa, Cassava, Distillers' grains, herb,etc
The dryer use the furnace that has different stages, the efficiency for the heating is rising up 15%-20%, and the cost to dry is lowered down, the tense of the drying is 2 or 3 times than traditional dryer, and the length of the drum is 30%-40% shorter than the single pass, the occupation of the three pass dryer is 65% lower than the single pass dryer.

1. Philosophy for the three pass dryer

DSCF5175

Three pass dryer is composed of three drum, the material flow as follows: Inner drum-->middle drum--->outter drum, every drum has the special shape of material guiding plate, the material is moved by the rotary force from drum and the attrative force from hot air.

Three Pass Dryer-1
Three Pass Dryer-10

2. The working status for dryer:

Three Pass Dryer-11

AB: pre-heating stage, material is transfered to the dryer, since the hot air, the temperature of material is rising up the wet ball, at this stage, the moisture inside the material is stable, and the temperature of hot air is dropping down, the heat release from hot air is use to pre heat the wet material.
BC. drying at the same speed, the ratio of drying is stable, at this stage, the feasture of wet ball has free water to be evapourated by the heat transfered from the hot air so that the temperature is stable, but the temperature of hot air and the moisture of material is dropping down.

CD: The ratio of drying is dropping down, the spreading ratio of moisture inside the material is less than
Rate of Evaporation for the moisture, the surface of material do not have enough moisture, so the ratio of drying is slow down, the heat transferd to the material is high than the heat used to evaporate the moisture so that the temperature of material is rising up and the temperature of hot air is dropping down.

DE, The moisture of material is lowered down the request and the material is released from the dryer to cooling system to make sure the temperature of material is a little high than ambient and pack it up.

3. specification of three pass dryer:

Heat Exchange——Agent for drying is hot air
Model HTG-600 HTG-1200 HTG-2400 HTG-4800 HTG-8000
Moisture erase 600 1200 2400 4800 8000
Primary moisture 70% 60% 50% 70% 60% 50% 70% 60% 50% 70% 60% 50% 70% 60% 50%
Final moisture 10% 10% 10% 10% 10%
Capacity(dryed) 300--800 600--1500 1200--3000 2400--6000 4000--10000
kgs/h
Coal consumption 500 320 240 500 320 240 500 320 240 500 320 240 500 320 240
Kgs/t
Electricity consumption 37 72.1 98.7 131,6 168
Output 45 95 130 175 220
Outter dimension(m) 32*6*5 34*7*6 36*9*7 38*10*7 50*10*8
Area 500 500 600 600 800

Direct Heating ——agent is high temperature cleaned bluegas

Model HTG-900 HTG-1800 HTG-3600 HTG-4800 HTG-5400 HTG-8000
Moisture erase 900 1800 3600 4800 5400 8000
Primary moisture 70% 60% 50% 70% 60% 50% 70% 60% 50% 70% 60% 50% 70% 60% 50% 70% 60% 50%
Final moisture 10% 10% 10% 10% 10% 10%
Capacity(dryed) 300--800 600--1500 1200--3000 2400--6000 2700-6000 4000-10000
kgs/h
Electricity consumption 25 38 53 60 75 105
Coal consumption 400 250 200 400 250 200 400 250 200 400 250 200 400 250 200 400 250 200
Kgs/t
Output 37 54 75 110 128 150
Outter dimension M 24×6×5 26×8×7 30×9×8 319 3110 40×12×12
Item Reference 1 Reference 2
Material dried Wood sheaving Wood chips
kg/h 8000 2500
Inlet hot air℃ 550-600 360-400
Outlet hot air℃ 110-125 130
Speed of drum rpm 5.5 5.5
Introduction fan kw 125 55
Output for dryer kw 13 8
Air capacity m3/h 60000 27000
Lenght of drier m 10 9
Diameter of dryer m 3.4 2.2

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