PROJECT PROFILE

Recently, the Belgian sawdust drying and pelletizing production line project undertaken by Zhengzhou jiutian has been installed and put into operation.

Zhengzhou jiutian biomass drying and granulating production line: the processing route adopts the mixing process of primary drying, secondary crushing, continuous feeding and regulated feeding. The molding rate of pellet molding fuel reaches 98%, and the bulk density and particle density are high. .

PROJECT PROCESS

Detailed introduction of sawdust drying and pelletizing production line

I. Pretreatment system

--Raw material crushing and screening‌

A double-shaft crusher is used to crush logs/wood blocks to a particle size of ≤30mm, and a magnetic separation device is equipped to remove metal impurities (iron removal efficiency ≥99%). Pre-dehydration treatment reduces the initial moisture content from 40%-60% to 20%-30%, improving drying efficiency.

--Particle size classification‌

The vibration screener divides the sawdust into coarse material (≥5mm) and qualified material (≤5mm), and the coarse material returns to the crushing process for cyclic treatment37

II. Drying system

--Core equipment selection‌

‌Drum dryer‌: drum inclination angle 1°-5°, speed 3-8rpm, built-in spiral lifting plate to achieve multi-stage temperature control (80-400℃ gradient adjustment)

--Heat source configuration‌

Biomass burner (fuel cost is 30%-40% lower) or gas boiler (thermal efficiency ≥85%). Equipped with waste heat recovery system to reduce energy consumption by 25%-35%.

III. Pellet forming system

--Pellet machine configuration‌

Ring die pellet machine‌: suitable for hardwood raw materials, mold compression ratio selection (pine 1:6, miscellaneous wood 1:8). Flat die pellet machine‌: suitable for small and medium production capacity (1-5t/h), maintenance cost is 30% lower.

--Process parameter control‌

Feed particle size ≤3 mm, moisture content 10%-15%. The mold temperature is maintained at 60-80℃ to prevent wood tar from sticking.

IV. Post-processing system

--Cooling and shaping‌

The counter-current cooling tower cools down to below 40℃, the cooling time is 15-20 minutes, and the particle hardness is increased to ≥97.5%

--Screening and packaging‌

The vibration screening machine removes powder and broken particles, and the purity of the finished product is ≥98%. The fully automatic packaging machine supports 25kg/bag or ton bag specifications, and the packaging speed is 30-50 bags/hour.