Uses of sawdust after drying
The main use of wood chips after drying is clean energy. For example, it can be made into biomass pellets or biomass briquettes as fuels for various boilers and hot air stoves without smoke and pollution, contributing to carbon reduction.
Sawdust can be used to manufacture various artificial boards, which can be used not only for the production of furniture, sanitary ware, but also for interior decoration.
Sawdust can be used to produce glucose and chemical products. 200 kg of glucose can be obtained by 1 ton of hydrolyzed sawdust. One ton of dry sawdust can make 190 kg of bioethanol. Sawdust can also be made into various chemical raw materials such as formaldehyde, furfural and organic acid after hydrolysis.
Sawdust can be processed into lightweight building materials. Pressurized sawdust at a high temperature can make wood pipes whose service life exceeds that of cement pipes and steel pipes.
Edible fungus such as tremella, oyster mushroom, shiitake mushroom can be cultivated with wood chips with high yield and good quality.
The corridors and aisles in public places have severe moisture regains. Some dry wood chips can absorb water and prevent pedestrians from slipping.
Dry wood chips can be used as composts with green substances to increase the ability of soil to retain water, keep heat, breathe freely and retain fertilizer, and improve the structure of the soil.
The description of sawdust dryer
Sawdust is an organic substance with the water content of about 40–50% and the general water content after drying is about 12%. Sawdust dryer is a kind of special equipment designed and manufactured for drying wood chips, sawdust, wood powder and other materials.
Sawdust before drying vs sawdust after drying
Advantages of FTM Machinery sawdust dryer
Automatic control system is adopted to ensure the stability of drying performance.
The pulse airstream drying principle is used to make the drying process efficient and rapid.
The tail drive make the drive more stable and reliable; completely change the phenomenon that the supporting wheel often slips to affect the production.
Optimized structure and small covering area.
The distribution of lifter composition is upgraded, effectively controlling the drying time and improving the drying quality.
Low tail gas temperature can prolong the service cycle of the dust removal equipment and enable continuous production to proceed to the next process.
Equipped with a new type of energy-saving hot blast stove, the sawdust dryer is highly-efficient, energy saving, easy to operate, and its coal consumption drops by as high as about 60%.
Working Principle of Sawdust Dryer
It is mainly composed of air heater, feeder, airflow drying tube, cyclone separator, fan, etc.
Working principle of sawdust dryer
The wet sawdust enters the barrel from the feeding hopper and then is pushed to the rear end by the spiral shoveling plate.
Due to the inclined placement of the dryer, on the one hand, the material flows to the rear end under the action of gravity and rotation, on the other hand, the material is repeatedly picked up by the shoveling plate to the upper end and continuously spread down, so that the material forms a uniform curtain in the cylinder.
The curtain fully exchanges heat with the hot air flow in the cylinder. Due to the repeated spreading of the material, the moisture contained is gradually dried, thereby achieving the purpose of drying.
Installation and Trial Run of Sawdust dryer
- 1The dryer should be installed on a horizontal concrete foundation and fixed with anchor bolts.
- 2Pay attention to the vertical between the main body and the horizontal when installing.
- 3After installation, check whether the bolts in each position are loose and the main engine door is tightened. If so, please tighten it.
- 4Configure the power line and control switch according to the power of the sawdust dryer.
- 5After the inspection is completed, carry out an empty load test run. If it is normal, production can be carried out.
FTM Machinery customer cases from India
In an Indian wood processing plant, there are many scraps of sawdust with the moisture content of 45%. After drying, the sawdust will be used as biomass fuel to increase its economic value. In 2018, they signed a contract for sawdust drying system equipment with our company.
FTM Machinery customer cases from India
Production status
| Daily operation time | 20 hours |
| Original moisture | 45% |
| Moisture after drying | 12% |
| Processing capacity | 15 t/h |
Customer feedback:
After half a year's use, the moisture content of sawdust after drying is 12%. It is very suitable to make biomass fuel, which solves my headaches. Dry sawdust does not contain any impurities and the entire production line is stable and reliable with a high degree of automation. I often get calls from the FTM Machinery company. They are concerned about my production status and the operation of the equipment.
The maintenance of sawdust dryer
- Sawdust dryer bearings bear all the load of drying equipment, so good lubrication has a great relationship with the life of the bearings, which directly affects the life and operation rate of the dryer. It is required that the injected lubricating oil must be clean and the sealing must be good.
- The newly installed tires are prone to loosening and must be checked frequently.
- Pay attention to whether the work of each part of the sawdust dryer is normal.
- Pay attention to check the wear level of the wearing parts of the sawdust dryer, and replace the worn parts at any time.
- If the oil temperature of the bearing rises, it should be stopped immediately to check the cause and eliminate it.
- If there is a noise when the sawdust dryer is in operation, it should be stopped immediately to check and eliminate it.
FAQs about sawdust and sawdust dryer
Is sawdust flammable?
Yes. Sawdust in the air may be ignited by sparks, cigarettes, overheated motors, etc., which will cause an explosion.
Solutions:
① Separate the heat source and sawdust before using the sawdust dryer.
② Spread the dried sawdust to reduce the possibility of sparks igniting.
Firefighting method:
① After extinguishing the flames on the surface with water, the sawdust must be dispersed to further extinguish the combustibles inside in the smoldering state. If necessary, it should be observed for a period of time to prevent reigniting.
② Use new fire extinguishers to eliminate smoldering fires.
Can sawdust be used as fertilizer?
Yes. The largest characteristic of sawdust is that it is loose and breathable, with good air permeability and certain water retention, which is very suitable for potted plants.
Sawdust being used as fertilizer
When mixing it with garden soil, you should pay attention to the proportion of different flowers. For planting those with fleshy roots such as Clivia, more wood chips are needed, even accounting for 70–80%. When planting other flowers, it can be added appropriately according to the situation in the principle of keeping the cultivated soil loose and breathable.
How does sawdust affect your safety?
Sawdust is considered as a carcinogen. If you only inhale sawdust occasionally, the harm is basically negligible. If you are working in wood, wood chips will be very important to your safety. Long-term exposure to wood chips may cause irritation to human skin, eyes and lungs. Therefore, safety precautions should be taken during work.
What are the preparations before turning on the sawdust dryer?
① Check the furnace door, the grate, the combustion chamber and any other places of the sawdust drum dryer.
② Check the air duct and regulating valve of the sawdust dryer as well as the transmission of the blower.
③ Check whether there are obstacles in the feeding and discharging devices of the sawdust drying system.
What are the starting steps of the sawdust dryer?
① Ignite the furnace.
② Start the motor of the rotary dryer for sawdust.
③ Turn on the spray device of the dust collector of the induced draft fan motor (depending on the configuration).
④ Start the device for conveying wet and dry sawdust.
What do you need to pay attention to when controlling the temperature of the sawdust dryer?
① Stable heat source. The heat source is an important configuration to provide wood chips with the internal temperature. If the temperature provided does not meet the requirements, the drying effect of the material will not be good.
② Control the temperature of the combustion chamber. It's generally controlled at 600℃ in winter and 500℃ in summer. If the temperature is too high, the conveying equipment will be damaged; if it is too low, the moisture of the sawdust will exceed the standard.
③ Eliminate water vapor in time. Vent water vapor out of the dryer in time to avoid its recombination with wood chips.
What are the shutdown steps of the sawdust dryer?
① Stop feeding and banking fire 30 minutes before stopping the operation of the equipment.
② Stop adding wet materials and turn off the motor of the sawdust dryer.
③ Stop the induced draft fan and the spraying device of the equipment.
If the temperature of the barrel is still as high as 200℃ after the sawdust dryer is shut down, rotate the barrel every 10–15 minutes until its temperature drops below 200℃ to avoid bending deformation of the barrel. If the equipment is stopped due to failure, bank up immediately and rotate the barrel according to the above steps until it cools down.
Parameter
|
Spec./m
(Dia.×Length) |
Shell Cubage
(m³) |
Capacity
(t/h) |
Installation
Obliquity (%) |
Highest Inlet
Air Temperature (℃) |
Main Motor
(kw) |
Weight
(t) |
|
Φ1.2×8.0
|
9.0
|
1.9～2.4
|
3～5
|
700～800
|
7.5
|
9
|
|
Φ1.2×10
|
11.3
|
2.4～3.0
|
3～5
|
700～800
|
7.5
|
11
|
|
Φ1.5×12
|
21.2
|
4.5～5.7
|
3～5
|
700～800
|
15
|
18.5
|
|
Φ1.5×14
|
24.7
|
5.3～6.6
|
3～5
|
700～800
|
15
|
19.7
|
|
Φ1.5×15
|
26.5
|
5.7～7.1
|
3～5
|
700～800
|
15
|
20.5
|
|
Φ1.8×12
|
30.5
|
6.5～8.1
|
3～5
|
700～800
|
18.5
|
21.5
|
|
Φ1.8×14
|
35.6
|
7.6～9.5
|
3～5
|
700～800
|
18.5
|
23
|
|
Φ2.2×12
|
45.6
|
9.7～12.2
|
3～5
|
700～800
|
22
|
33.5
|
|
Φ2.2×14
|
53.2
|
11.4～14.2
|
3～5
|
700～800
|
22
|
36
|
|
Φ2.2×16
|
60.8
|
13.0～16.2
|
3～5
|
700～800
|
22
|
38
|
|
Φ2.4×14
|
63.3
|
13.5～16.9
|
3～5
|
700～800
|
37
|
45
|
|
Φ2.4×18
|
81.4
|
17.4～21.7
|
3～5
|
700～800
|
37
|
49
|
|
Φ2.4×20
|
90.4
|
19.3～24.1
|
3～5
|
700～800
|
45
|
54
|
|
Φ2.4×22
|
99.5
|
21.2～26.5
|
3～5
|
700～800
|
45
|
58
|
|
Φ2.6×24
|
127.4
|
27.2～34.0
|
3～5
|
700～800
|
55
|
73
|
|
Φ3.0×20
|
141.3
|
30.1～37.7
|
3～5
|
700～800
|
75
|
85
|
|
Φ3.0×25
|
176.6
|
37.7～47.1
|
3～5
|
700～800
|
75
|
95
|
|
Φ3.2×25
|
201
|
42.9～53.6
|
3～5
|
700～800
|
90
|
110
|
|
Φ3.6×28
|
285
|
60.8～76.0
|
3～5
|
700～800
|
160
|
135
|
Technical parameters of indirect heat dryer:
| Shell diameter ×shell Length Items |
Inside diameter of outer shell (mm) |
Inside diameter of inner shell (mm) |
Shell Length (m) |
Shell cubage (m³) |
Shell obliquity |
Lifting blade form |
Highest inlet air temperature (℃) |
Dimensions (m) |
| Φ1.5×15m | 1500 | 500 | 15 | 20.27 | 3-5% | Lifting form | 850 | 16.2×2.7×2.7 |
| Φ1.5×17m | 17 | 22.97 | 18.2×2.7×2.7 | |||||
| Φ1.5×19m | 19 | 25.68 | 20.0×2.9×2.9 | |||||
| Φ1.8×21m | 1800 | 650 | 21 | 35.91 | 3-5% | Lifting form | 850 | 22.5×2.7×2.7 |
| Φ1.8×23m | 23 | 39.33 | 24.5×2.9×2.9 | |||||
| Φ1.8×25m | 25 | 42.75 | 26.5×2.9×2.9 | |||||
| Φ2.2×21m | 2200 | 800 | 21 | 58.10 | 3-5% | Lifting form | 850 | ---- |
| Φ2.2×23m | 23 | 63.61 | ||||||
| Φ2.2×25m | 25 | 69.15 |
|
Spec./m
(Dia.×Length) |
Shell Cubage
(m³) |
Capacity
(t/h) |
|
Φ1.2×8.0
|
9.0
|
1.9～2.4
|
|
Φ1.2×10
|
11.3
|
2.4～3.0
|
|
Φ1.5×12
|
21.2
|
4.5～5.7
|
|
Φ1.5×14
|
24.7
|
5.3～6.6
|
|
Φ1.5×15
|
26.5
|
5.7～7.1
|
|
Φ1.8×12
|
30.5
|
6.5～8.1
|
|
Φ1.8×14
|
35.6
|
7.6～9.5
|
|
Φ2.2×12
|
45.6
|
9.7～12.2
|
|
Φ2.2×14
|
53.2
|
11.4～14.2
|
|
Φ2.2×16
|
60.8
|
13.0～16.2
|
|
Φ2.4×14
|
63.3
|
13.5～16.9
|
|
Φ2.4×18
|
81.4
|
17.4～21.7
|
|
Φ2.4×20
|
90.4
|
19.3～24.1
|
|
Φ2.4×22
|
99.5
|
21.2～26.5
|
|
Φ2.6×24
|
127.4
|
27.2～34.0
|
|
Φ3.0×20
|
141.3
|
30.1～37.7
|
|
Φ3.0×25
|
176.6
|
37.7～47.1
|
|
Φ3.2×25
|
201
|
42.9～53.6
|
|
Φ3.6×28
|
285
|
60.8～76.0
|
Technical parameters of indirect heat dryer:
| Shell diameter ×shell Length Items |
Inside diameter of outer shell (mm) |
Inside diameter of inner shell (mm) |
Shell cubage (m³) |
| Φ1.5×15m | 1500 | 500 | 20.27 |
| Φ1.5×17m | 22.97 | ||
| Φ1.5×19m | 25.68 | ||
| Φ1.8×21m | 1800 | 650 | 35.91 |
| Φ1.8×23m | 39.33 | ||
| Φ1.8×25m | 42.75 | ||
| Φ2.2×21m | 2200 | 800 | 58.10 |
| Φ2.2×23m | 63.61 | ||
| Φ2.2×25m | 69.15 |