Low-speed desander desilter: it is also called “barite recovery” centrifuge. Its separating factor is 500~700. To low-density solids, its separating point is 6~10μm. To high-density solids, its separating point is 4~7μm. This kind of centrifuge can be used for recovering barite. Medium-speed Desander: its separating factor is 800 or so, solids of 5~7μm can be separated, so harmful solids can be separated from the mud, so that gravity and viscosity of the mud can be controlled. Most drill team will choose this kind of centrifuge at present. High-speed Desander: its separating factor is 1200~2100 or so, separating point is 2~5μm, it can remove harmful solids, control mud viscosity, it is usually connected with low speed centrifuge to make up a dual centrifuge system(See figure 3). In the system, low-speed centrifuge is installed at the first grade, barite separated from it is discharged into mud tank to be recovered, liquid is drained into a surge drum first, and then be sent by a pump to high-speed centrifuge; the solid separated from high-speed centrifuge will be discharged out of the tank and the liquid is back to recirculation system. “Dual Desander system” can remove harmful solids efficiently, at the same time, avoid wasting barite. List of LW series horizontal scroll discharge Desander produced by our company is in the following table: LW450~842N LW600~945N LW355~1250N “Barite recovery” Desander,Mid-speed Desander,High-speed centrifuge,Frequency converting and speed regulating,means that this kind of function can be achieved. we recommend to use 2.2 Dreg’s being removed principle of the centrifuge.It is done by propeller. A speed differential will form between propeller and drum under the function of differential, then the solids which has deposited on drum’s surface will be scraped off and be pushed to the small end of the drum by spiral fan gradually and be dewatered during propelling, at last, be thrown out of the drum when reaching sand-discharging gate.Operation principle of the differential See Figure 4 for the structure of the ifferential, in fact, it is a two-stage planetary reducing gear, there is internal gear on the shell. Shell rotate with the drum, and then left pulley drive 1-stage sun gear on the input shaft to rotate, at this time, 1-stage sun gear gear into inner gear through 1-stage planet gear, thus 1-stage revolving arm rotational speed is formed by rotational speed of shell and input axle, and this rotational speed was outputted to 2-stage through 2-stage sun gear. The transmission principle of the two stages are the same, at last, propeller begin to rotate driven by output shaft. Differential is the most complex and most important part of the Desander, so you must replace the oil according to the manual say, no other oil is recommended, otherwise it may affect differential’s working condition and its serving life,gnsolidsamerica.com is the author of the article,pls click here to visit us
