Month: March 2020

Recently, the GN Solids Control R & D team has successfully upgraded the original mud recovery system-upgraded shield mud separation system for several months in response to the market demand for shields, pipe jacking and piling, and first received orders for the domestic market. The system has been successfully introduced to the international market and will be issued to foreign customers in the near future. Orders for this batch of shield mud separation systems have come from several engineering construction units in Saudi Arabia, Singapore, Myanmar and India. In addition to bored pile engineering, this system with a small footprint, low cost, and significant processing effect can also be widely used in tunnel shield and pipe jacking projects and non-excavation directional crossing projects.

This set of mud separation system is mainly composed of three solid-liquid separation equipments such as vibrating screen, sand removing cyclone and mud removing cyclone. Its working principle is as follows:

1. A slurry supply pump pumps engineering slurry from a mud pit to a Shale shaker for preliminary solid phase separation to remove large particles of sand and gravel. It should be noted that the slurry supply pump can be purchased separately by the customer or selected by our company for the customer. Match.

2. After the slurry has undergone preliminary solid-liquid separation through a shale shaker, the slurry supply pump in the system is pressurized to supply the sand removal cyclone. After the high-speed cyclone separation, the grit component with a particle diameter greater than 40 microns is removed, the fine sediment is separated into the transfer tank, and then fed to the desilting cyclone by a slurry pump. The desilter cyclone will be more than 20 microns The particles are separated, and the slurry below 20 microns is returned to the storage tank, and re-proportioned and pumped to the construction machinery for recycling.

3. This system can also be equipped with a high-speed centrifugal dewatering centrifuge, which can separate 5-20 micron fine particles in the mud to ensure the performance of the mud.

The upgraded GN Solids Control shield mud separation system can be divided into three types according to different processing capacity: GNTBM-240M, GNTBM-360M and GNTBM-500M. The corresponding processing capacity is 240 m3 / h, 360 m3 / h, and 500 m3 / h. hour.

Considering the transportation costs of foreign customers and customers in remote areas in China, the above piling mud purification system does not have a standard storage mud tank. Customers can configure the corresponding mud tank according to their actual needs. These mud tanks can be customized by the customer or can be matched by our company. After the system is equipped with a mud tank, it can even be equipped with a skid-mounted mud jet mixing device to form a complete mud recovery system.

If you have related requirements, please feel free to contact GN Solids Control.

Recently, GN Solids Control GNSP-40B series solid vacuum pumps and GNSP-20B series solid vacuum pumps have been sent to certain offshore drilling platforms. Due to its strong conveying capacity, high work efficiency, low equipment failure rate, simple operation and maintenance, etc., it has been favored by customers such as PetroChina and CNOOC. How can this equipment also be used to clean cabins, clean mud tanks, transport and convey, and cast cuttings , Cleaning platform and many other uses.

This project’s GN Solids Control GNSP-40B series solid vacuum pumps, also called pneumatic conveying pumps, are also called solid vacuum pumps because they can use the internal vacuum pressure of the equipment to transport materials with high solid content. The designed single unit processing capacity is 40m3 / h, and the gas supply demand is 17m³ / min.

GN Solids Control GNSP-40B series solid vacuum pump has the following characteristics:

1. High-efficiency Venturi device can generate vacuum of up to 85Kpa / 25 inches of mercury under the action of strong airflow, absorption maximum distance 50m, and emission maximum distance 1000m

2. There are no moving parts and wear parts inside the equipment, the maintenance cost is low, and the maximum granularity of the conveyed material is 75mm;

3. The pump body has a compact structure and a small volume. The weight of the equipment is 892Kg, which is about 2.6 square meters.

4. Equipped with high-quality control box to meet the use conditions of various working conditions.

The vacuum pump is mainly an idealized equipment for conveying solid and liquid materials with high solid content and high viscosity. The main working sites are: abandoned oil sludge ponds in oilfields, base rock cuttings while drilling, oil sludge from oil refineries, weathered sludge from oil fields, fracturing Oily sludge such as liquid oil sands; municipal sludge, building sludge, piling shield sludge, river dredging sludge, and other high solid content sludge; sand, stones, mine slag, and other solid particles

If you have related requirements, please feel free to contact GN Solids Control.

The sewage treatment plant will reuse or discharge the sewage sent through the necessary treatment means to meet the national water quality control standards. From the perspective of sewage treatment, pollutants can be divided into suspended solid particles, organic pollutants, toxic substances, polluted organisms and polluted nutrients.

Treatment methods can be divided into physical treatment methods, biological treatment methods, sludge disposal and chemical treatment methods generated from sewage treatment according to the type of water quality. The physical treatment method is a method for separating and removing pollutants in sewage by using physical action. Common methods are sieve retention, gravity separation, centrifugation and so on. The decanter centrifuge plays an important role in the processing equipment of centrifugal separation.

Sludge dewatering is the main obstacle to river dredging projects. Equipped with a Shale Shaker, a sand remover, and a desilting dredging system, which can remove sludge above 25 microns, but fine particles below 25 microns cannot be processed. At this time, a centrifuge is needed. The GN Solids Control centrifuge can separate fine particles above 5 microns without adding polymers and relying only on mechanical separation. Through the addition of drug flocculation technology, the centrifuge and Dewatering unit can be used together to achieve zero emissions.

Sewage is pretreated by processing equipment such as grids, sand settling tanks, sedimentation tanks, etc. At this time, fine solid particles still exist in the sewage. The decanter centrifuge can use the quality difference between the fine particles (minimum 2-5 microns can be separated) and the liquid to mechanically complete the problems that the previous processing equipment cannot handle. GN Solids Control decanter centrifuge adopts centrifugal cast two-way stainless steel 2304 or 2205. The internal pusher adopts tungsten carbide alloy sheet inlaid protection for more durable and durable, these features provide protection to improve the life of the centrifuge.

What difference speed (pushing speed) can be used for sewage treatment?

1) First, the high differential speed (pushing speed) completely mixes liquid and solids; the entire mud centrifuge will work like a mixing mixer instead of an effective solid-liquid separation device.

2) Secondly, chemicals are usually added to the separated wastewater. High differential speed (pushing speed) will cause some medicine to be lost in the liquid outlet.

3) In addition, if chemicals are added to the wastewater before entering the centrifuge, it will generate foam in the centrifuge.

Therefore, if your centrifuge has experienced the above problems, you may need to consider reducing the differential speed (feed speed).

After the decanter centrifuge processes the sewage, it will then pass through activated sludge treatment system and tertiary treatment of biological denitrification and phosphorus removal, coagulation sedimentation filtration, activated carbon adsorption, etc., and finally become reclaimed water, which is usually called water.

If you have related requirements, please feel free to contact GN Solids Control.