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Zhengzhou Dayang Briquette Machinery Co.,Ltd
Add: No.1,Industrial Zone of Nanyang Village, Zhengzhou City, Henan Province, China
Contact: Simba Lee
Tel: +86-371-63782063
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E-mail: zzdybriquette@163.com

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How To Make Wood Pellets With Sawdust
Apr 28, 2017

How to Make Wood Pellets with Sawdust


Steps of Sawdust Pellets Making Process:

1. Start the biomass pellet machine in which you will make your pellets and wait a few minutes for heating up the ring die. The heat could help the lignin in the wood fiber out of the sawdust, and bonding the sawdust as the pellets.

2. Put a large box under the chute of the biomass pellet machine for catching the pellets during pelletizing process. Feed the sawdust by handfuls or small shovelfuls into the hopper of the pellet mill. In a few seconds, pellets will begin to fall out of the chute into the box.

3. Allow the pellets to cool in the box before you handle them. When they are cool they are ready for you to burn in a pellet stove or a pellet insert. Store any unused pellets in bags in a dry place.

4. Sieve the pellets that did not form properly. Some pieces will fall apart or break during the pressing process. Separate the improperly formed pieces by shaking or sifting them through a screen.

mini pellet machinemini pellet machinepellet mill

Materials collection and preparation:

After we have purchase a proper pellet mill, the next thing we have to notice is the technology process. 

Another thing you have to concern about is to collect the materials. Maybe, you need a car to transmit the material like sawdust, wood branch or other biomass plants to your home or backyard. Actually, the transmission fee is a big problem for cost saving. Long distance transmission is not advisable for use.  Of course, the material must be fit for production. Sometimes we need to process them at first according to the production requirements. A hammer mill may be used to make the materials have the same particle size. The length should be less than 6mm. The particle size effect the efficiency of pellet making. Uniform in size can clocked the machine sometimes. 


Also the other factor that decided the pelletizing process is the moisture content of the materials. The perfect moisture content is between 12-14%. At this situation, the pellets have the best pellet quality and good shape. If the material is too dry, the pellets are loose in shape which is easy to break for hand touch. In addition, the too wet materials can not make pellets or make the machine slip. All you have to do is to dry the raw material under sunshine for a few days. If necessary, a dryer can be used to dry the materials. As for the too dry of the materials, spay a little water on the materials maybe a good way.


Before feeding the sawdust into the pellet mill, the operator should test the moisture content of sawdust first. The optimum moisture content of the sawdust is 10-15%. The sawdust with higher moisture content should be dried before entering the pellet mill, while the lower one can skip the procedure. For the storage of sawdust, the sawdust with high moisture content should be stored separately from sawdust with low moisture content. Generally, bulk sawdust of 7 m³ with the moisture content around 50-55% are needed to produce 1 ton pellets with the pellet mill.


Screening: The screening of sawdust is an important step before making wood pellets with the pellet mill. The purpose for screening of the sawdust is to remove the impurities, such as stones, plastics, metals and other hard materials in the sawdust that may influence the working efficiency or even lead to serious wearing of the pellet mill. The stones and other hard materials in the sawdust can be removed by a stone trap. While the metal debris can be picked out by a magnet.

screenscreen

Mixing: sometimes a bounder is needed to make pellets. For material which is difficult for making pellets, a addictive of bounder can be added for good quality of pellets.


The process:

Now, you have good preparation for making pellets. The pellet mill is proper, the materials has the proper particle size and moisture content. All you have to do is the careful process technology. 

sawdust pellet production line

Checking: 

The pellets should come out of the biomass pellet machine hard and shiny. If they are mushy there is too much moisture in the sawdust. Allow it to dry out and try again. If the pellets are crumbly there is not enough moisture in the sawdust. Add water with a spray bottle to a small amount of sawdust and mix well before feeding it into the mill. It should take only one or two tries for you to get a sense of the correct amount of moisture required. You can ask local lumber yards for sawdust but make sure the sawdust is clean and is not from chemically treated wood.


Maintaining:

It seems that after you have pelletized the wood pellet you have done all the things you have to do. But there also have some important point you must to know, and have to follow to do.

Firstly, you should clean the die and rollers carefully. When you feed the machine with raw materials, there may have some hard impurities got stuck and if you don’t clean them out, it will be very harmful to the working station of the machine. Furthermore, you may not forget the bearings. The bearings will be working in a high temperature and high press, so maintain the bearings is very important.


Here have some advices and you can take based on your own situation. Before the mill begins to work, you can grand the die with the mixture of bran and oil. And the clearance between the template and pinch roller should be 0.1-0.3mm. Then, you should clean the bearing every 2-5 days and fill it up with grease that resist to high temperature. You also have to know that all the maintenances thing must be done in the state of blackout. And the machine should be placed suitable and stable, because it is not good to the mill if you move it constantly.

pellet production line

If the pellet mill has low production, there are several reasons should be concerned: 

1. New die. Please check up whether the compression ratio is matching up to the raw materials at first. If the compression ratio is too big, the resistance force that material pass through the  die holes are increasing, the extruding pellet is hard and the output is lower; if the compression ration is so small that the extruding pellet can not molded. So it is necessary to choose a proper compression ration one more time. The second is to check up the degree of finish of holes of ring die. Bad quality ring dies has rough surface of ring die holes, and the resistance force of discharging is so big that the surface of the pellets is rough with low output. At last, check up the round ring die is out-of-round or not. This can give rise to lower output of the pellets. So it is necessary to choose a high quality ring die. 

 

2.  After the flat die is in operation for a period of time, please check up whether the taped holes of inside flat die is wearing or not, and the compression rollers are wearing or not. If the wearing resistance is serious, please maintain the ring die and countersink the wearing taped hole. The wearing compression rollers much be replaced. The wearing of the ring die holes affected the output greatly.  

 

3. To adjust the clearance of the die and compression rollers. Too small clearance can increase the friction force of the compression rollers and ring die with short life span of ring die. Big clearance gives rise to slipping of the compression rollers with lower output.

pellet plant

ZHENGZHOU DAYANG BRIQUETTE MACHINERY CO., LTD

Add:  No.1,Industrial Zone of Nanyang Village, Zhengzhou City, Henan Province, China

Contact: Simba Lee

Tel: +86-371-63782063

Mobile: +86-13526658007

Fax: +86-371-63782062 

Skype: simba58007

E-mail: zzdybriquette@gmail.com

website:www.dayang-briquettepress.com


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