As a drilling mud decanter centrifuge manufacturer, GN Solids Control has developed a series of big bowl decanter centrifuge for tunnel boring machine slurry treatment. The most popular decanter centrifuges for TBM projects are as following:

1）GNLW553C-VFD Decanter Centrifuge
The GNLW553C decanter centrifuge is designed with bowl size of 22inch diameter by 71 inch length. The hydraulic capacity for water is up to 500GPM. This centrifuge is designed for small Tunnel Boring Project. It can be used with flocculation system for dewatering or mechanical separation for TBM Slurry.

2）GNLW764A Decanter Centrifuge
The GNLW764A decanter centrifuge is large bowl centrifuge is designed with bowl size 30inch diameter by 132 inch length. It’s hydraulic capacity for water is up to 1000GPM. This centrifuge is designed for big Tunnel Boring Project.

Features of GN Big Bowl Decanter Centrifuge for TBM Slurry Treatment
1）Duplex Stainless Steel bowl made from Centrifugal casting.
2）All along the screw inside the bowl is protected by Tungsten Carbide tiles.
3）The Solids Discharge port on the bowl and the Mud distribution port on the Auger is protected by Tungsten Carbide inserts.
4）The bearing is SKF premium bearings for longer and stable operation.
5）The VFD and PLC control system with HMI screen design is for user friendly and smart control.

The typical process of TBM Slurry Separation
The TBM slurry feeds to Coarse mesh primary shale shaker for first phase separation. After that the overflow will be pumped to big desander cones for sanding removal. The third phase separation is by a group of desilters for silt separation. Normally below the desander and desilter the underneath shaker is for drying the solids. The decanter centrifuge is used to remove fine solids. The flocculation system is to offer chemical enhanced technology to give clean water for reuse.