Solids control system equipment selected according to the drilling depth. The choice of equipment for the same well depth in different regions is also different. Generally, we will choose according to the model of the drilling rig, from ZJ20-ZJ90, under normal circumstances, ZJ30 drilling rig only needs 3 levels of solids control equipment, namely: drilling fluid shale shaker, de-sander, and desilter.
Above ZJ30 is a level 5 purification equipment: drilling fluid shale shaker, vacuum degasser, de-sander, desilter, drilling fluid centrifuge. Among them, the mud tank is indispensable as a carrier. The commonly used mud tank specifications are: 95000x2300x2100mm and 125000x2400x2300mm. The number of mud tanks is calculated according to the total volume of the drilling mud, and the appropriate number and size are selected. The amount of circulating mud that needs to be processed is approximately 65% of the total volume of the mud tank. The processing capacity of the solids control equipment at all levels can be selected to meet the circulating mud volume or slightly larger.
The main equipment in the solids control system is the 5-level purification equipment, shale shaker, vacuum deaerator, desander, desilter, centrifuge. The choice of equipment is flexibly selected according to different drilling rigs, and other auxiliary equipment is also indispensable. Desander and desilter must be powered by sand pumps one-to-one. Centrifuges can be supplied by submerged slurry pumps or screw pumps. Where there is a agitator, you must bring a mud gun. The mud gun can flush the dead corners of the tank and start the auxiliary agitator. In addition, the jet mixing device in the solids control system is also indispensable. The jet mixing device can exist as a separate entity, or it can be directly connected to the tail end of the mixing tank and connected by a pipe manifold.
In urban subway construction, the shield method has become one of the main options for tunnel construction. The large amount of waste muck produced by shield tunneling has brought many challenges to the urban environment. The processes of dewatering, transportation, and landfilling of muck will have great adverse effects on the environment.(Separation Technology of Shield Dregs)
As a kind of urban mineral resources, muck will occupy a large amount of land resources for landfill disposal. If the reclaimed muck is used as synchronous grouting material, ecological brick material, roadbed filler, etc., it will effectively enhance the ecological and environmental protection function of subway construction. Carrying out the recovery and treatment of shield dregs, and using shield dregs as an urban mineral resource can greatly reduce the development of natural resources, protect the urban ecological environment, and have significant social, environmental and economic benefits. Shield excavated soil has been used as building materials and garden soil at home and abroad, and certain application results have been achieved.
At present, in the construction of subway shields at home and abroad, there is still a lot of room for the research on the efficient separation technology of shield dregs. The existing mechanical screening technology has relatively high cost. When tunneling in different strata, the particle size distribution of the generated muck is also different, and the use effect is not good. It is urgent to carry out research on the efficient screening technology of shield muck. The moisture content of shield muck soil is as high as 40%, and it is difficult to dehydrate. At present, there are two commonly used dehydration methods in construction: one is mechanical dehydration after adding an industrial agent to the mud; the other is natural drying. The former is costly and the latter is inefficient.
The slurry separation system is an indispensable supporting facility in modern shield construction. Shield construction refers to the use of shield tunnel boring machines to excavate tunnels on railways, highways, subways, municipalities, water and electricity and other pipes. With the improvement of shield technology, the selection of equipment and technology of the slurry separation system in shield construction have put forward higher requirements.
The slurry separation system mainly includes a shale shaker, a cyclone screen device and a filter press device, the vibrating screen device and the cyclone screen device are connected, the cyclone screen device and the filter press device are connected, and the connection mode is stacked connection Or connect with conveying equipment. The KOSUN shield slurry separation system can perform different separation treatments according to different particle sizes, make full use of the favorable particles in the excavated soil, improve the self-making capacity of the system, and effectively realize the slurry separation system in the shield tunneling, and the separation latter water is re-injected into the muddy water system for circulation. The equipment can be flexibly adjusted according to different terrain conditions. The convenient construction operation reduces the trouble of the slurry separation system occupying a large area and reduces the pollution of the mud to the environment.
The modern slurry separation system pays more attention to environmental protection in design, and highlights the concept of environmental protection in various aspects such as pulping, slurry mixing, separation equipment selection, and waste discharge. KOSUN’s slurry separation system is built based on the previous construction experience at home and abroad and the high-standard rationalization suggestions put forward by customers. With scientific and technological innovation as the standard, the current situation of low separation level is improved by increasing the configuration standard of the desilting device, so that the separation particle size reaches about 15 microns, which greatly reduces the amount of slurry preparation and reduces engineering costs.