dewatering centrifuge

As one of the professional manufacturer of TBM (Tunnel Boring Machine) Slurry Separation Plant in China, GN solids control recently provide standard design TBM slurry separation system with different treating capacity, normally the required slurry volume is very big, we can provide separation system with capacity of 240m3/h, 360m3/h, 500m3/h, 1000m3/h and customized design TBM slurry separation system as per our client’s requirement. Also we can provide TBM slurry dewatering decanter centrifuge if you need to get more clear water and drier discharged solids, the water can be recovered to save cost.


A basic TBM slurry separation unit including: coarse solids separation shaker, double deck shale shaker with hydrocyclones, feeding pump ( for desander cone and desilter cone), fluids collection mud tank with tank accessories.


The coarse solids shaker is used to separate the big solids, stones, sands and other big mass from the slurry and protect the equipments in the next process. The shaker screens to be used is a type of slot screen instead of woven screen, which is more wear resistance in separation of coarse solids.
The mud cleaner is a combination of desander cone, desilter cone and double deck bottom shale shaker, 2 feeding pump transfer the slurry to desander cone, desilter cone separately. The desander cone cut point is 45 microns, the desilter cone cut point is 25 microns, both of the desander cone and desilter cone are made of 100% polyurethane material. Compared with single deck bottom shale shaker, the double deck shale shaker can separate the discharged solids much drier, so that the users can collect the discharged solids easily by trucks.
The mud tank to collect the slurry will storage the slurry temporarily and after the final treatment of desilter cone, the clean fluids will be reused to keep the TBM project working well.

Recently GN solids control shipped several sets of mud cleaning system to our North America client, this is for their repeat orders for vacuum truck slurry/mud cleaning system. The technical configuration of the mud cleaning system is as below:


1) Slurry collection hopper which is installed on top of the slurry treatment system, in the previous design the slurry collection hopper is laying separately, considering the area limit at client’s working site, we put the slurry collection hopper on top of the mud cleaning tank to save space. There is discharge port under the collection hopper to feed directly to the 2 units of dual deck shale shaker.


2) The coarse solids separation tank including 2 units of dual deck shale shaker and 1 unit of mud agitator. The shaker screens installed is with coarse mesh size, so that coarse solids can be separated out in this process.
3) The fine solids separation tank including 1 unit of linear motion shale shaker with fine wire mesh to separate the fine solids from the slurry, the submersible slurry pump transfer the clean mud to the mud cleaner, the desilter cone separation cut point is 25 microns. The outter protection guard is desgined for HSE purpose according to client’s feedback.


4) The clean mud discharged from mud cleaner will be transferred to dewatering centrifuge system to separate ultra fine solids up to 1 microns. The dewatering centrifuge is a big bowl big volume decanter centrifuge with VFD control panel, to increase the separation efficiency and get drier discharged solids, chemical dosing system will be used before feeding to the dewatering centrifuge.
The discharged solids will be reused for construction industry, the recovered fluids can be also used in the process. For more information of the system, pls contact with GN solids sales.

One set of dewatering centrifuge package is shipped to Southeast Asia for TBM mud treatment and water recovery project. This is not the first dewatering centrifuge package to be used for TBM mud dewatering project, we ever used it for similar projects several years ago, pls check the working video from our website: https://www.gnsolidscontrol.com/video/gn-solids-control-drilling-mud-dewatering-system-working-video


If you need the customized solution of huge volume mud treatment for TBM, Tunneling, Piling projects or other pipeline laying projects, pls contact with GN solids sales.
The technical specifications are as below:
1) 1 unit of GN dewatering decanter centrifuge laying into the 20ft container, the max speed is up to 3900rpm, the normal operation speed is 3200rpm, with separation cut point by mechanical separation is 2~5 microns. The max G force is up to 3063G, the normal G force is 2062 G, the bowl is made of duplex stainless steel 2205, the screw is made of stainless steel 304. The fluids distribution port and solids discharge port is made of tungsten carbide inserts and it is replaceable. The screw impeller is protected by tungsten carbide tiles for longer operation time.


2) The chemical dosing system installed into a 20ft container, including 3 compartment tank with chemical feeding hopper, agitator, piping system and bracket, PLC control panel and chemical dosing pump. Normally flocculants will be added by the chemical dosing system to the decanter centrifuge feed pipe, so that the ultra fine solids will be accumulated to bigger size solids, the decanter centrifuge can separate them easily, it will increase the separation performance of the high speed decanter centrifuge.


3) The container equipped with doors, windows, air conditioner, lightings, etc. accessories for customer’s requirement. The 2 container design is customized design, usually we will put everything into a 40ft container for convenient transportation or without container as per client’s option.

GN solids control shipped one unit of hydrovac excavation waste slurry treatment system to Canada this week. The configuration is as below:
1) Dewatering centrifuge modular:


One unit of 22 inch bowl decanter centrifuge with feeding pump, telescopic skid as dewatering centrifuge unit, it can work together with chemical dosing system by adding flocculant or chemicals. A fluids catching tank with pump is installed under the centrifuge fluids discharge port to collect the fluids discharged from the dewatering centrifuge.
2) Fine Solids Hydro cycling Separation Module


GN mud cleaner ( desilter cone with bottom shale shaker) separate the ultra fine solids by desilter cone with feeding pump, the cut point is 25 microns. The washing tank under the mud cleaner collect the clean slurry discharged from desilter, and the drying shaker recover more useful fluids and make the discharged solids much drier.
3) Waste Collecting and Washing Module


Firstly the waste ( composed of water, soil, large size trash and other mass) is delivered to the site by hydrovac truck and discharged to the large collection hopper, a bottom screen separate the large size trash from the waste slurry. After separation, the waste is collected by the mud tank under the coarse screen. The waste slurry is pumped to GN high G drying shaker to separate fine solids and reduce the solids content. The high pressure jetting device is used to flushing the screens to avoid the blocking of shaker screens and wash the slurry.GN own made composite material shaker screens for longer working life is installed on the shale shaker.