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Step By Step How Make Pellet From Grass

Date: 08/14/2020 08:35:28 From: Clicks:

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Grass biomass is a bulky material that can be burned as whole bales, chopped and burned, or powdered and burned without densification. Densification into briquettes, cubes or pellets, however, gives the feedstock more uniform density and physical size, which improves handling, storage, transportation, and control over the combustion process.

Grass pellets
Grass pellets

Grass pellets have been proven to be one of the hot sale fuel pellets. Compared to other traditional fuel resources, grass pellets production is generally cheap as well as very environmental friendly. The grass pellet machine is not hazardous to the environment and thus it is seen as the best way to curb the current global warming problems as well as controlling the general climatic change.

Step By Step How Make Pellet From Grass


Herbaceous plant material must be reduced in size prior to grinding. This is typically accomplished with a tub grinder. Bales or portions of bales are either manually transferred to the chopper using a loader, or are fed in automatically using a conveyor belt. This chopping process reduces particle size to facilitate feeding and fine grinding. Some method of separating any metal or stones from the feedstock prior to grinding is advisable. Missing from the schematic above is a very significant component of a wood pelleting operation: the drying unit. Sawdust is typically around 30% moisture and must be dried prior to processing. Grass hay does not require any additional drying before pelleting.


The chopped material is transferred by auger or vacuum system to the hammer mill. A cyclone mounted above the hammer mill separates air from the chopped material. The hammer mill grinds grass biomass to a size appropriate for pelleting. A combination of beating and cutting is used to pass the material through a 1/8 inch or smaller mesh screen. Ground material again needs to be separated from air prior to pelleting, this is accomplished in a second cyclone mounted above the pelleting unit. Air pressure or augers move the ground material up into the cyclone.


Virtually all pellet presses in North America use ring die pellet machine, some regions of the world use flat die pellet machine. Ring die pellet machine has larger output, more stable performance and longer life. Moisture content should be approximately 10-15% depending on the specific equipment. Steam may be used at startup to heat the dye assembly up to a temperature that optimizes pellet formation. Normally binders have not been used with grass to improve pellet hardness and stability. If process parameters are matched to feedstock properties there should be no need for binders. There is some concern that short grass pellets may not be structurally stable. A variety of binders could be used, if required, to improve pellet hardness and stability.

ring die pellet machine
ring die pellet machine

Pellet Formation

The compaction process begins with mechanical forces bringing individual particles in close contact. The feedstock is physically crushed to eliminate open spaces, from hollow stems to intracellular space. A combination of temperature, pressure and moisture conditions will cause some components of the feedstock to soften and become plastic. In this plastic form materials become elastic and “flow”, increasing the physical contact between particles. A variety of physical forces act to give strength to the densified particles, from short-range atomic bonding to mechanical interlocking. Successful pelleting will result in a matrix of plant fiber cemented together in a stable densified unit.

Cleaning, Cooling, and Storage

Pellets are very hot and soft following the extruding process. The individual feedstock, the grinding process, and various adjustments to the pelleting process will influence the percentage of fines in pelleted material. Pellets should be screened to remove these fines. The screenings are returned to the pelleting unit for reuse. Pellets need to be quickly cooled within a few degrees of ambient temperature, or they will attract moisture. Pellets will loose about two percentage units of moisture during the cooling process. Pellets can be stored in ground level silos, or in elevated storage bins to facilitate loading for bulk transportation.

How to Choose a Suitable Grass Pellet Mill?

Is the Manufacturing Company Reputable?

A good quality machine will determine the quality of the end product that you will receive from the machine. If the machine’s quality is high, chances are you will get a higher output. Do your research before making a purchase.

Make sure the company has good reviews and its old customers are satisfied with the quality of their product. You can check the grass pellet quality by testing the machine before buying it.

Is the Cost According to Your Budget Plan?

The cost of grass pellet machines matters a lot. No matter if you are buying a small-sized or large-sized grass pellet mill, keep in mind that the product you buy must have a long-serving life and its power needs (electricity, fuel) are according to the power availability in your area. Do not leave a suitable grass pellet mill behind just because it costs a few bucks more than you had planned. It is a one-time investment so make the decision wisely.

What is Your Output Demand?

Determine your output demand. Are you buying it to feed your farm animals or want to sell grass pellets on the commercial level? Small pellet mills will produce a lesser amount of grass pellets as compared to the large feed pellet machine. So, choose the one that meets your output demands.

Will You Get After-Sale Services?

Another important thing to consider is whether the company provides after-sale services or not. If they provide installation, repair, and other similar services then you can save a lot of needless cost by getting help for free.

Which Grasses Are Suitable For Making Grass Pellets

Various grasses
Various grasses

Alfalfa Pellet

Alfalfa is widely grown throughout the world as forage for cattle, and is most often harvested as hay, but can also be made into biofuel pellet.

Hemp Pellet

The hemp pellets produced by the hemp Pellet Mill Production Line have two uses: one can be used as animal feed pellets and the other can be used as pellet fuel.Fuel pellets for pellet stoves and boilers are today almost exclusively made from wood. However, hemp may start to replace wood as the prominent source of biomass for fuel pellets for domestic pellet stoves and boilers.

Miscanthus Pellet

Miscanthus species or elephant grasses is a high yielding energy crops. They are perennial, rhizomatous grass, which can grow more than 3 meters tall in a growing season. Miscanthus giganteus has high value for biomass fuel production, which makes them one of the most popular energy plants . Miscanthus now is widely planted in Asia, North America and Europe.

Switchgrass Pellets

Switchgrass (panicum virgatum) is native to the northern United States. Switchgrass pellet is able to release usable heat at 82-84% efficiency in a close coupled gasifier pellet stove designed to handle moderately high as fuels. Compared with oil and natural gas systems, switchgrass pellets have the potential to reduce fuel heating costs and greenhouse emissions.

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Use grass as raw material to make fuel pellets

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