Month: March 2023

As one of the decanter centrifuge manufacturer in China, GN solids control provide complete pre sales and after sales support to our customer. When use a decanter centrifuge, it is important to adjust the parameters during process to reach your required treatment result. And when the decanter centrifuge is used for different applications, its parameter adjustment is different.

In actual operation, the mud quality and amount of sludge may change. To ensure the dehydration effect remains same, the user can reasonably select relevant parameters of the decanter centrifuge based on factors such as the material properties of the suspension, the requirements for liquid and solid phases after separation, and processing capacity, such as processing capacity, bowl rotation speed, differential speed between bowl and screw, and overflow plate diameter, to achieve expected separation result.
When the feed rate remains same, the greater of the differential speed, the shorter time that the sludge stays in the centrifuge bowl . Due to the increased relative movement between the bowl and the screw, the solid recovery rate of dehydration and the solid content of the sludge cake will both decrease, but the processing capacity of the centrifuge will increase.
The smaller of the differential speed, the longer time the sludge stays in the bowl. Due to the reduced relative movement between the bowl and the screw, the solid recovery rate will decrease and the treatment capacity will decrease. The differential speed should not be too small, which may lead to solids accumulation inside the bowl and excessive torque which can damage the centrifuge. The differential speed is normally determined based on the solid content of the material.
The user can adjust the centrifuge feeding pump feed rate and adjust the differential speed by the positive pressurized VFD control panel through PLC touch screen, there are main motor, back drive motor and pump motor VFD installed inside the panel.

The oil water separator is a device to remove free non emulsified oil, diesel, gasoline and fuels from a waste stream by using coalescing media. A disc centrifuge ( also known as disc separator) is a 3 phase centrifuge to separate oil and water. Also the 3 phase decanter centrifuge is also widely used as oil, water and solids separation.

Their function is similar to separate oil and water, but working principal is different also the structure is different.
GN oil water separator (short as OWS) with high capacity and easy operation, the disadvantage is that the treatment result can not meet the strict requirement, the main components including OWS main body, coalescing media, cover support beam, openable top cover, oil discharge pipe, feed port, oil outlet, water outlet, sludge discharge. The working principal is that the influent water enters the oil water separator and flows through a tightly stacked bunble of coalescing media. Due to the different gravity, oil decants by gravity into a oil reservoir, the solids slide down the surface of the media, oil free clean water under an oil reservoir baffle to a clean water effluent chamber.

The 3 phase disc separator is design for light liquid, heavy liquid and solids separation, the working principal is by centrifugal force, with the neutral holes of the disc as the interface, the heavy liquid moves along the disc wall towards the outside the neutral hole, the lighter liquid moves along the disc wall into the neutral hole, the heavy solids accumulated in the sediment area, the light liquid and heavy liquid are discharged by the centrifugal pump and the heavy solids is discharged.
The 3 phase decanter centrifuge working principal is also by centrifugal force for the 3 materials with different gravity, especially for oil, water and solids separation.

The oil and gas drilling solids treatment system is a solidification or stabilization process of the drilling cuttings/ low gravity solids (including sand, silt, clays). The solids after solidification process will be relatively safe to disposal or landfill and hazardous material will not penetrate into the ground to pollute the water source. The solids discharged from decanter centrifuge is mainly ultra fine solids and can not be separated mechanically again, the economic way is to add chemical additives to prevent the hazardous waste from penetration.

The working principal is as below:
The drilling cuttings are dumped into the collection hopper and transfer to mixing chamber by bottom screw conveyor. At the same time, the lime and absorber are transferred by screw conveyor to the mixing chamber, and mixed by the high shear mixer inside the mixing chamber. The mixed solids are discharged from the discharge port, waste bag can be layed at the bottom of the mixing chamber outlet for convenient collection.
GN solidification unit is designed to suit for container shipment for convenient transportation and reduce transportation cost. The moisture content in the drilling cuttings before treatment will influence the performance of solidification unit and influence the consumption of lime and absorber, which is related to the operation cost. If the drilling cuttings is too wet, the user will need to use more lime and absorber, and the working cost of the solidification unit will be too high. The additives can be replaced to others type equivalent as required.
To reduce the moisture of the drilling cuttings, GN solids control also produce high G drying shaker dewatering centrifuge with chemical dosing unit for water based mud drilling cuttings cleaning. GN ViST vacuum screen technology can be applied with the primary shale shaker to reduce the waste volume and reduce moisture.