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Process Flow of Straw Pellet Production Line

Date: 10/09/2020 08:29:53 From: wood-pellet-plant.com Clicks:

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The straw pellet production line has a complete set of equipment to produce straw pellets. Some people may ask, what is the difference between this and the straw pellet machine? Of course there is a difference. The straw pellet machine is just a pellet machine, which is less than the straw pellet production line equipment such as crusher, dryer, cooling system, screening system, packing system, conveying system and dust removal system. So, what is the process flow of the straw pellet production line?

Straw Pellet
Straw Pellet

Raw materials preparation:Straws usually has a high potential of dust, which is affected by the way of harvesting. Thus, straw needs to be screened from contaminants, such as, dust that may influence straw pellet quality and other alien materials, such as, stones, metals, and those that may damage the pellet mill in the following procedures.

Grinding: Straw biomass is a tube-like or pipe-like material with a diameter of 4 to 8 mm, and wall thickness around 0.3-0.6mm. With the tube/pipe-like structure, straw can be easily processed and get the desire particle size. Generally, the grinding of straws including cutting and chopping of the straws.

Drying: Usually, straw delivered in form of air-dried bale, with the moisture around 15%, which is the proper for straw pellet production. Therefore the drying of straw pellets is often by-passed. Even if drying is needed for straw pellet production, straw requires far less drying comparing with sawdust.

Conditioning: Straw requires special conditioning to achieve desirable hardness. Straw conditioning includes the application of steam(and /or water) and the addition of binding agents or additives. Conditioning is required to achieve the necessary temperature and moisture to get the malleability and to melt the lignin to act as binding agent. Binding agents are needed to strengthen the hardness of the pellets and also to decrease abrasion during pelletizing.

Pelletizing: During pelletizing, it is necessary to consider the factors such as, materials moisture content, density, particle size, fiber strength, and the natural binder for they can influence the pellet quality.

The common problems during pelletizing of straw pellets are pellet die blocking and breakage, overheating, high energy costs or bad pellet quality and high maintain of the pellet mill. To avoid of the mentioned problems, high quality pellet mill is needed. Generally speaking, straw requires a thicker pellet die comparing with that of sawdust to increase the compression length( the friction forces), to obtain a more favorable product quality.

Cooling and screening: Newly extruded straw pellets are hot and soft which needs to be cooled down to get a desirable hardness while at the same time fine particles will be recycled.

Typical biomass pellets properities from different sources
Typical biomass pellets properities from different sources

Straw pellets

After pelletizing, two effects are achieved: the decreased moisture content and increased bulk density. The moisture content of straw pellets are decreased from 15-20% to less than 10% while the bulk density is increased from 130 to 600 kg/m³.

General characteristics of straw pellets and wood pellets and their respective materials.
General characteristics of straw pellets and wood pellets and their respective materials.

Through the above comparison, it is obvious that straw pellets have a low moisture content, higher calorific value and lower ash content. After pelletizing, the heating value of straw pellet can be increased to 18-19 MK/kg while the ash content is decreased to less than 3%, which make straw pellets good for burning.

Straw pellets application

Straw pellets are widely used in daily life. Generally, straw pellets can be used as animal bedding, feed for animals, and fuel for heating for home and industry use.

1.Straw pellets as fuel

Straw pellets as fuels are usually burning at pellet boilers, pellet stoves and other pellet appliance at household. While large scale straw pellets usually co-fires with traditional fuels, such as coals, oil and others, at large scale boilers or power plant or factory, etc.

Straw pellets as fuel
Straw pellets as fuel

2.As animal bedding

Beside being used as fuel and animal fodders, straw pellets can also be used as animal bedding, such as horse bedding, cat litter, etc. Straw pellets used as animal bedding are popular for straw pellets are , natural products without additives and of high hygienic, they are the best products for animal bedding.

As animal bedding
As animal bedding

3.As animal feed

Straw pellets can be good pellet fodder for animals. Comparing with straw, the straw pellets fodders has the advantages of cleanness, balance nutrition, easy to store and longer quality guarantee period.

As animal feed
As animal feed

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