Double Screw Cycling Silo

 Brief Introduction

TONY double screw cycling silo is specialized equipment designed for the front-end buffering, material homogenization, and continuous feeding of biomass pellet production lines; it is primarily used in medium-to-large-scale pelletizing projects featuring multiple pellet mills operating in parallel. To address common issues associated with lightweight, loose materials—such as sawdust, wood shavings, bamboo chips, palm fibers, and chopped straw—which are prone to bridging, uneven distribution, and inconsistent discharge, the system employs a counter-rotating twin-auger structure at the silo base. This mechanism continuously agitates the material while storing it, ensuring uniform distribution and stable feed delivery to multiple pellet mills.

Unlike hydraulic material-discharging silos, this system utilizes a mechanical, continuous circulation and homogenization process. If one pellet mill shuts down for maintenance, the material inside the silo continues to circulate, preventing accumulation or bridging; the remaining pellet mills can continue production, thereby significantly reducing the likelihood of a total line shutdown. It is the preferred storage solution for multi-machine parallel production lines. The silo body is available with either a painted carbon steel finish or a hot-dip galvanized anti-corrosion coating.

Working Principle

Crushedd and dried biomass feedstock is conveyed from the top of the silo into a double-screw circulation bin for temporary storage. At the base of the bin, two counter-rotating screws continuously drive the material to circulate and turn over, constantly breaking up any arches that form and thereby preventing bridging or clogging at the source. During circulation, the material is evenly distributed across the various discharge outlets; driven by the screw action and gravity, it is discharged from these outlets and transported to the respective pellet mills. Core Mechanism: If a single pellet mill shuts down, the discharge gate for that station is closed; the material continues to circulate within the bin without stagnating or piling up, while the remaining pellet mills continue normal production. When the pellet mill resumes operation, the gate is opened to restart the material feed.

Main Parts

1.Silo Body: 

Constructed from thickened steel plate (hot-dip galvanizing optional); features a square housing, a top inlet, a dust extraction port, and an inspection/observation hatch; designed with a "dead-zone-free" interior.

2.Dual-Auger Circulation Mechanism: 

Two parallel augers at the silo base rotate synchronously in opposite directions, circulating and agitating the material; the system simultaneously prevents bridging and facilitates material distribution; auger flights feature wear-resistant treatment.

3.Drive System: 

Motor and gearbox with variable frequency drive (VFD); allows for adjustable auger speed to control the material discharge rate.

4.Multiple Discharge/Distribution Ports: 

Configured with 1 to 4 discharge stations designed to connect with screw conveyors, enabling material distribution to multiple pellet mills.

5.Automatic Material Level Control: 

High and low-level switches linked to upstream conveying equipment; enables automatic refilling and automatic shutdown when the silo is full.

Parameter

Raw Materials 

TONY Double Screw Cycling Silo utilizes auger circulation to turn over material and break up arches; it is suitable for fine, loose, and arch-prone biomass feedstocks, and is particularly ideal for supplying multiple pellet mills operating in parallel.

1.Wood chips, wood shavings, wood flour, sawdust, and wood scraps

2.Bamboo chips, bamboo powder, shredded branches, and bark fragments

3.Palm fibers and crushed palm shells

4.Shredded crop stalks: corn stalks, wheat stalks, cotton stalks, etc.

5.Peanut shells, rice husks, and crushed fruit shells

6.Shredded garden waste (dead branches and landscaping debris)

7.Lightweight agricultural and forestry waste, such as sugarcane bagasse

Features

1.Double Screw circulation for arch breaking and steady discharge Counter-rotating twin augers break up material arches, mitigating issues like bridging and uneven material flow common with biomass. 2.Independent multi-station feeding with no mutual interference Each of the 1–4 discharge stations features an independent gate; maintenance on one unit allows the rest to continue operating, minimizing production downtime losses. 3.Variable frequency control and overload protection Feeding flow rate is adjustable via VFD; the system automatically stops if a hard object causes a jam, protecting the auger flights.

4.Enclosed dust suppression for safety and environmental compliance

Fully enclosed bin structure with a dedicated dust extraction port; explosion-proof configuration available to meet dust-handling safety standards.

5.Floor-mounted design—no pit required; easy installation

Heavy-duty frame mounts directly to the floor, compatible with both new and existing production lines; hot-dip galvanized finish available for enhanced corrosion resistance.

6.Material level interlocking for reduced labor

Real-time material level monitoring enables automatic refilling and alarms for full/low levels, reducing the need for manual supervision.

Usage Scenarios

Model Selection Key Points

The double screw cycling Silo is a specialized buffer and material-equalizing unit for biomass pellet production lines. Equipped with two counter-rotating augers at the bottom, it circulates and agitates the material within the bin, effectively preventing bridging and arching issues associated with sawdust, wood shavings, bamboo chips, and chopped straw; a single silo can provide a uniform feed to multiple pellet mills simultaneously. 1.Determine the number of discharge stations based on the number of pellet mill units; for multiple units operating in parallel, a dual-auger circulating silo is the preferred choice. 2.Determine silo capacity based on hourly production output; the buffer capacity should ideally cover 30–60 minutes of production material requirements. 3.For environments involving high humidity or highly corrosive materials, hot-dip galvanized silo bodies are recommended. 4.Verify on-site dust collection and explosion-proof requirements, and select explosion-proof components as needed.

5.Selection guide: For setups primarily featuring a single pellet mill or handling materials with extremely high bulkiness (low density), a galvanized hydraulic silo is an option; for parallel production with multiple pellet mills, a dual-auger circulating silo is preferred.

Customer Cases

Shipments

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Why Chose TONY?

Contact Us

If you are interested in TONY Double Screw Cycling Silo,please send us inquiry freely.

Please confirm the problem before quotation.

1.Please confirm your raw materials first.

2.Please confirm the size of your raw material.

3.Are your raw material wet or dry?

4.After that, please confirm what is the capacity required per hour?