F A Q

A: Yes! Our unique systems can pelletize any type of woody biomass with moisture as high as 50% (With suitable Dryer)

A: Bark does not cause issues with pelleting however a significant amount of bark can lead to higher ash in the burning process and can create more wear on the die and rollers.

A: Yes! All our TURNKEY supply include installation and commissioning at your facility with extra cost.

A. Our SERVODAY Pellet Mill Can Solve The Problem That Biomass Fuel With Crude Fiber Is Difficult To Pellet And Has Bad Performance. The Main Drive Of Our Pellet Mill Adopts The High Accuracy Gear Driving. It Makes Gear Directly-Connecting As The Driver, And Is With Quick-Release Die Fixed By Clamps, Which Can Increase The Output 15% More Than The Same Type Machine With Belt-Driven, Also The Pellet Mill Automation System Include Auto Oil Lubrication Pump With No Flow Protection, Oil Temperature Protection, Auto Grease Injector System, Chamber Temperature Monitoring System, Roll RPM Sensor, Split Pin Sensor etc.

A: Yes! We Offer Premium Grade Dryers At A Low Cost For Any Size Production.

Q: Do We Need To Add Binders?

A: The SERVODAY Pellet Mill Machine Designed By Our Factory Is A Newly-Developed Renewable Energy Equipment Which Can Transform Any Agro-Wastes Into Bio-Fuel Pellets With High Calorific Value It Can Used Almost All Kinds Of Corn Straw, Straw, Rice, Wheat Straw, Wheat Shell, Bean Straw, Cotton Stalk, Medical Dregs, Tree Branches, Leaves And Wood Chips, Sawdust, Hay Etc.

Feeders and Conditioners provide an optimum preparation of raw materials prior to pelleting. The optimum feeding and conditioning of the product ensures you get the highest performance out of a Pellet Mill. Some of the benefits of proper feeding and conditioning is a higher production throughput, better pellet durability and improved digestibility at reduced Pellet Mill power consumption.

A. The ring die pellet mills were designed at around the 1930’s based on the design of ring die. The basic pelleting principle of the ring die pellet mill is a simple operation where feed mass is distributed over the inner surface of a rotating, perforated die ahead of each roll, which compress the feed mass and compress it into the die holes to form pellets.

A. The die geometry determines the pellet dimensions, density and durability. The aspect ratio (length to diameter of the pellet) can be a metric for the degree of compression during pelletization. An increase in pelletizing pressure increases the length of the pellet, whereas an increase in pellets diameter decreases the pelletizing pressure. Hence, the geometry of the die has a significant determination on the pressure applied onto the resulted pellet.

The inner diameter (D) and the effective length (L) of the die determine the pellet density. The effective length is the die thickness that actually performs work on the feed. L/D ratio is the effective length divided by the inner diameter of the die. High L/D ratios provide high pellet die resistance as feed moves through the die. Low L/D ratios provide less resistance. Each material has an L/D ratio requirement to form the material into a pellet. The durability of the pellets improves when a smaller die with higher L/D ratios is used. However, if a longer die length is used, which will introduce a higher friction with no more improvement in the pellet durability. This will consume excess energy for production. Therefore, there should have optimum L/D ratios of the die for different types of biomass to produce durable pellets.

A: The Ring Die Offered By SERVODAY Are Of Supreme Quality With Super High Hardness And Longer Service Life. But There Are Still Lots Of Pellet Mill Manufacturers Or Die And Roller Producers Out There Taking Careless About The Material Ingredients Put Into Use, Unfortunately, A Disqualified Die-Roller Assembly Will Not Only Produce Subpar Biomass Pellets, But Also Be Used Just With A Shortened Life, And Even Crack Or Fissure Unfavorably Occurs To The Die Per Se. Or Shortly Two Rollers Will Be Burnt Badly. According To Statistics, A Die-Roller Assembly Can Be Used Constantly For Pelletization Of About 1200 Tons. After That, The Die Is Subject To Repair Of Die Pores And The Roller Unit Shall Be Replaced Due To Previously Accumulated Wear And Tear. To Tackle The Issue, SERVODAY Will Draw Out Client-Oriented Design And Offer Timely Delivered Spare Parts To Your Side. Speaking Of The Press Rollers, As We Know, A Complete Pellet Plant Runs Continuously At Least For One Work Shift, That Is To Say, The Die-Roller Assembly Of A Pellet Mill Will Constantly Rotate For At Least 8 Hours Under High Temperature And Extreme Pressure. Feedstock Will Be Pressed Tightly Between The Die And Two Rollers In The Pelletizing Chamber, And Temperature Of The Chamber Is Consequently On The Rise.

A: For A Ring Die Pellet Mill, At Least Two Big Rollers Shall Be Used To Constitute A Die-Roller Assembly Pelletizing Material And The Assembly Is Mounted In The Pelletizing Chamber.

A. The Two Big Rollers Are Subject To The Die During Running, And Ultra High Pressure Will Be Rendered When wood, biomass and feedstock Flowing In The Chamber. Technically, The Roller Unit Exerts Pressing Force For Material To Be Pelletized Just In The Nip Space Between The Die And Two Rollers. Positions Of The Rollers Can Be Adjusted Respectively Yet Uniformly To Achieve An Even Pressing Strength. And The Two Rollers Are Directly Connected With Oil Pump On The Back Of A Pellet Mill.

A. Bearings Of The Two Rollers Shall Be Greased Every One Or At Least Every Two Hours To Assure The Rollers Can Smoothly Revolve. Otherwise, Those Bearings Will Be Burnt Down Or Deformed (Out-Of-Roundness May Happen To The Roller Surface.) SERVODAY Wood Pellet Mill Will Alleviate Your Concern For That And Will Rest Assure You Lubrication On Bearings During Running Can Be Conducted.

A. New Ring Die Shall Be Done With Grinding-In For At Least Half An Hour Before Put Into Official Production. Because A New Die Still Has Some Burs Left On The Newly Drilled Pores. Polishing The New Is A Must. Generally, A Proportioned Oily Mixture (5% Fine Sand Is Supposed To Be Mixed With About 20% Pure Used Oil And Some Feedstock) Can Be Used As Grinding-In Material For Die Pores. However, You Shall Be Warned Of The Imperative Step.

A. Every Time Before Pellet Production Comes To An End, The Pellet Mill Shall Be Put With Another Kind Of Oily Mixture (To This End, Fine Stand Shall Not Be Used But Only Some Feedstock Blended With Pure Used Oil. Because Long-Standing Use Of Fine Sand Mingled In Oily Mixture May Lead To Change Of The Compression Ratio Of Die Pores.) To Purge Out All Material From Die Pores And To Some Extent To Polish And Lubricate The Die As Well. Otherwise, Fed-In Material Will Be Tightly Stuck In Die Pores Due To The Decline Of Temperature After Work And Hardly To Be Squeezed Out Even If In This Regard Oily Mixture Will Be Used Yet In Vain. Therefore, Oily Mixture Shall Be Put Into Practice For Real For About 20 Minutes Before Pellet Mill Is Shut Down.

An increase in the product temperature by 10 Centigrade through the addition of saturated steam translates into an increase in the product moisture by 0.6-0.7% H2O. Conditioning is limited above all on the moisture content and by the influence it can have on the nutrients, vitamins and micro-organism contained in the mash.

The mash is subjected to rapid compression /compaction as a result of the narrowing of the gap.ªThe pressure “P” is increasing in direction of thedie hole, until resistance “R” in the die hole hasbeen overcome.ªThe pellet will be advanced by the product layerthickness “V” forced into the die holes.By increasing the product feed rate,the thickness of the product carpet will increase.Maximum product layer thickness depends on:ªResistance in the die hole.ªConfiguration of the press rolls.ªEscape of mash at the sides.ªPellet quality.The pressure in the compression zone depends on:ªFriction coefficient of the mash.ªDie hole design.ªDie hole condition."

Pelleting die and press rolls are the most important elements of a pellet mill, their diameter has a direct infulence on: (1) Relative movement of the rolls. (2) Energy Consumption (3) Maximum Intake capability (4) Pellet quality (5) Conditioning temperature. A uniform as possible distribution of the mash over the entire width of the die and the number of press rolls is of enormous importance.

Reduction of harmful bacteria= thermal treatment / Hygienizing ªPlasticizing of the individual solid particles ªCreation of liquid bridges ªHigher throughput rates ªReduction of the energy requirement ªLonger service life of dies and rolls ªPartial gelatinisation of the starch ªImprovement of the moisture balance ªReduction of production costs Binding bridges between two mash particles After cooling, the pellet should have a moisture content of12 – 14 % H2O. ªFor commercial reasons> higher bulk density possible. ªFor quality considerations> as close as possible to the shelf life limit.

Zone I = Product intakeAfter the mash has been fed into the die cover itwill be fed in zone I to the area of the rotating die.Zone II = Product distributionZone II serves for the uniform spreading of themash across the die width.Zone III = Compression and outputZone III often called the nip, is the phase wherethe pelleting process takes place.The carpet of mash reaches the roll and is drawninto the nip formed between the roll and the die, iscompressed and is forced through the die holes.Zone IV = Dwell time / no advance in die holeIn zone IV the pellet will be carried without furtherexternal influences to the next pressroll.

The relation between the size of the rolls and the diameter of the die, is of enormous importance to the resulting angle of nip and consequently to the intake capability of a pellet mill.ªThe physical intake capability, or maximum product layer, will be limited by an angle of nip of 12°

Increase in circumferential speed of die by1 m/sec= Increase in spec. energy requirement0.6 – 0.8 kWh/t.An excessive circumferential speed of thedie will lead to excessive energy costs andmay affect the pellet quality. An insufficient circumferential speed of thedie will limit the throughput and will oftenlead to choking of the pellet mill. Values commonly encountered in practice:5 - 8 m/sec.