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Wood Chips Drier

Time:2018年11月30日      Hits:

Sunco Machinery can design and supply the Wood Chips Drier for reducing the moisture conent of the wood chips to be about 15%, and the dry wood chips can be used for wood pellets and briquettes factory.

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Why need to dry wood chips ?

heating value of dry wood in average ≈ 19 MJ/kg, different forms of wood fuels, e.g. split billets, wood chips and pellets, saw dust, bark, etc. moisture lowers the net heating value of wood chips.

At harvest the moisture content of wood is around 50 % (total weight), to evaporate 1 kg of water takes about 2,5 MJ/kg H2O (0,8 kWh/kg H2O), e.g. 2 kg of wood chips, moisture content 50 %, = 1 kg dry-matter of wood + 1 kg water → net heating value ≈ (19 – 2,5) MJ ≈ 16,5 MJ  → 8,25 MJ/kg of fuel.

Moisture content affects greatly on net heating value of wood fuel (see tables 1 & 2 ):

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In practice the heating effect of small-scale boilers decreases even more.

--- the total efficiency of the boiler decreases rapidly when the moisture content rises (boiler tests are usually made with fuel

that contains 30 % or less moisture/water)

--- moisture content decreases conversion efficiency into energy and increases gaseous emissions (incomplete combustion)

--- when using dry fuels the boiler stays cleaner, malfunctions and need for maintenance decreases → uptime increases.

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As a result, in order to increase the calorific value of the wood chips, we have to find ways to reduce the moisture content of wood chips to be about 20%.

The wood chip drying machine of Sunco Machinery can successfully to solve this problem. And it can use waste heat or normal fuel to generate hot air for the wood chip drying system.

Wood chips Drier System work flow is as follows:

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--- Fuel feeder sends dry wood chips into Biomass Burner.

--- Biomass Burner is used to burn the dry wood chips, and generate high temperature air for the drying system.

--- Ash Settling Chamber is used to collect the ash generated in the burning process.

--- Inlet Belt Conveyor sends wet wood chips into feeder.

--- Feeder sends wet wood chips into the Special Designed Rotary Dryer for wood chips.

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--- The Special Designed Rotary Dryer is designed according to the features of the wet wood chips. Rotary dryer not only supply the drying space, but also its special inner structure disperse the wet wood chips and increase the heat contact area between the high temperature air and wet wood chips as much as possible, and then the dryer can have better heat exchanging efficiency, and the water is evaporated into water vapor, and finally the moisture content of wet wood chips is reduced to be about 10% .

--- Draft Fan makes the high temperature air into the dryer, and make the exhaust air and water vapor out of the dryer, and then goes into the cyclone separator.

--- Inside the cyclone separator, the fine dust is separated from the exhaust air, and falls down to the bottom of cyclone separator, then through the wind closing device and falls onto the outlet belt conveyor. The exhaust air and water vapor leaves the cyclone separator from the top, and then pass through the draft fan and goes into water dedusting tower.

--- The water dedusting tower work together with the recycling water pool, and get rid of the rest dust of the exhaust air, and finally the exhaust air goes into atmosphere.

--- Outlet Belt Conveyor takes the dry wood chips to the product storage area.

--- Electric Control Panel is used to control all the above machines.

If you are in need of Wood Chips Drier machine, please supply more informations as follows:

01. What is the usual size of your wood chips ?

02. Please send us some photos of your wood chips for reference.

03. What is the bulk density (kg per cubic meter) of your wet wood chips ?

04. What is the initial moisture content of your wet wood chips ?

05. What is the output moisture content of the dry wood chips needed ?

06. How many tons wet wood chips do you need to dry per hour ?

07. What kind of fuel will you prefer to use such as coal, waste wood, wood chips, natural gas, diesel, etc ?

For more detail of Wood Chips Drier machine, please contact Sunco Machinery:

--- Email: suncomachinery@hotmail.com

--- Tel./WhatsApp: +86-15838214261

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