Tag Archives: chemical dosing unit

Automatic tank cleaning system manufacturer in China

The tank cleaning system consists of tank cleaning machine and the tank cleaning sludge treatment system.
The tank cleaning machine is developed for cleaning tanks in hazardous areas, which provide better cleaning efficiency with minimal use of time, energy and cleaning media.
The tank cleaning machine consists of two main part, one is washing unit, the other one is portable air driven unit. The typical application of the tank cleaning machine will be for crude oil storage tanks, large process vessels and fermenters, large silos and dryers, large reactor, large uni-tanks.

The working principal is as below:
The cleaning media flows through the machine to the nozzle and out of the tank, with high pressure jetting to the tank. This jetting cleaning will create a criss crossed pattern on the tank walls, covering 360° of the tank. The first cycle will create a wide pattern, Pre Wash, on the tank walls, the following cycles will dense the pattern until a full program is reached after 4 cycles.

After cleaning, the sludge will be treated by automatic tank cleaning system, it is a continuous process with waste water cleaning capacity up to 30m3/h, the treated water can be back to high pressure tank cleaning machine for tank cleaning reuse. The process will minimize the consumption of water and manpower involved.
The tank cleaning system can be designed as a skid mounted system or divided into 3 modules according to the job site layout, the explosion proof standard could be as CNEX zone 1 application, ATEX or IEC EX for different applications. The automatic tank cleaning system including strainer, suction pump, chemical dosing unit, static mixer, electric control system, inclined plate clarifier, membrane pump, etc. If you need a tank cleaning unit for onshore or offshore project, pls contact with GN solids control.

Dewatering centrifuge for fluids treatment

Depends on the density and viscosity of the fluids to be treated, to make the solids liquids separation easily, for the fluids which is difficult to separate, normally we need to enlarge the solids particle size, reduce fluids viscosity and increase solids liquids density difference by methods of mechanical and chemical ways. Besides, we can also apply to increase concentration, preconcentration and wear resistant accordingly to improve the centrifuge treating capability and reduce the abrasion to the centrifuge screw.
The solution to enlarge the suspended particles by mechanical or chemical methods including:

  1. Inorganic electrolyte is added to the suspension fluids as a coagulant to agglomerate small particles into large particles.
  2. Mixing with flocculants or coagulants, the order of adding various flocculants, and the intensity and time of mixing have an impact on the flocculation effect. Therefore, the type and dosage of flocculants need to be determined by the mixing test. The requirement of Flocculation treatment effect is that the settling speed of flocculated fluids is fast, and the clarity of top layer clear liquid is good.
  3. Change the viscosity and density of the fluids by adjusting temperature
    Especially for the oil sludge treatment by decanter centrifuge, heating the oil sludge and mixing with proper chemicals to reduce the viscosity will increase the solids liquid separation efficiency.
    A dewatering centrifuge package including one unit of dewatering centrifuge, centrifuge feeding pump, fluids catching tank with pipelines and tank accessories, chemical dosing unit.
    GN dewatering centrifuges can be used for treatment of oil sludge, drilling mud, construction slurry, industrial waste water and other kinds of solids liquid separation. The centrifuge models including 14 inch bowl centrifuge, 18 inch bowl centrifuge, 22 inch bowl centrifuge and 30 inch bowl centrifuge. If you need a dewatering centrifuge package, pls contact with GN solids control.

Big bowl big volume decanter centrifuge for TBM slurry separation

GNLW764A-VFD decanter centrifuge with dewatering unit are delivered to our TBM engineering client for TBM slurry separation, the big bowl big volume decanter centrifuge GNLW764A-VFD is the biggest model we can produce right now, the technical specification is as below:

Bowl diameter: 760mm, bowl length : 3328mm, the designed treating capacity is 528gpm, max bowl speed s 2650rpm, normally used 2200rpm, max G force is 3000G, the typical G force is 2060G,the gearbox torch is 25000N.m. with gearbox ratio 38:1, the differential speed adjustable from 5 to 28 rpm, the main motor power is 160KW, the back drive motor power is 90KW, the mechanical separation cut point is 2 ~ 5 microns.

2021.08.18 Slurry Dewatering Unit
To get more pure water and drier solids discharged, the user can add flocculants to the mud with chemical dosing unit GNDW-6000L, which with treating capacity 6000L/h. the chemicals can be added into the 3 compartment chemical mixing tank, which with mud agitator, to mix the dry powder with water, the mixed chemicals are feed to decanter centrifuge feed tube by the chemical dosing unit, we have 2 units in the system, one for use, one as back up. The mixed chemical are mixed with slurry in the decanter centrifuge feed tube and separated by the decanter centrifuge, the chemicals can improve the separation efficiency and get more clear water and much drier solids, the water can be reused by TBM, the solids can be colleted by bag or transported by truck. All the equipments are installed inside the 20ft container, 2 containers overlay placement can save space requirement, and for convenient transportation, also it is sun proof, rain proof and user friendly design, equipped with proper windows, doors, lightings and air conditioner.

2021.08.18 TBM Slurry Separation Centrifuge
If you need a customized TBM slurry separation solution, pls contact with GN solids control.

GN Hydrovac Slurry Dewatering System In North America

Another set of GN hydrovac slurry dewatering system used in North America, this is not the first unit of hydrovac slurry dewatering system working in North America, according to client’s feedback, we are very pleased to improve our design and production according to client’s feedback and suggestion, our design principal is user friendly and high performance cost ratio.

GN Hydrovac Slurry Dewatering System 20210730- (4)
The technical configuration of GN Hydrovac Slurry Dewatering System is as below:
1)    Catch hopper, to collect the sludge material dumped from hydrovac truck and feed to coarse solids separation shaker.
2)    Coarse Shaker , to separate the coarse solids, big stones and other metal materials, so that the slurry will not damage the shaker screens of the double deck fine mesh shale shaker. The submersible slurry pump feed the slurry to fine shaker.

GN Hydrovac Slurry Dewatering System 20210730- (2)
3)     Double Deck Fine Shaker GNZS706F-SHBF, there are 2 layers shaker deck, the top screen is to separate the coarse solids, the bottom screen is to separate the fine mesh solids. GN solids control can produce shaker screens comply with API RP13C standard from API 20 to API 325.
4)    Desilter GNZJ594-12N , which is a combination unit for desilter cone and bottom shale shaker, the 4 inch desilter cone separation cut point is 20 microns. The bottom shaker screen dimension is 585x1165mm. the desilter cone is 100% polyurethane material for better abrasion resistance.
5)    Decanter Centrifuge GNLW553-VFD , with separation cut point is 2~5 microns, by using proper chemicals, the separation cut point is up to 1 microns. The decanter centrifuge is installed on the telescopic skid, a fluids catching tank is under the decanter centrifuge.

GN Hydrovac Slurry Dewatering System 20210730- (1)
6)    Chemical Dosing Unit, the proper chemicals should be used with decanter centrifuge.
7)    Mud Tank 10369x2100x2312mm, the dimension is suitable for container shipment, with tank accessories and pipelines, the equipments installed on top of it.

Mud mixing system for engineering work

2 mud tank mixing system are ready for shipment which will be used for trenchless engineering work. GN desander unit for TBM, Piling is the first phase separation and second phase separation system, we have 3 models of desander unit for option, GNMS-200D, GNMS-500D, GNMS-1000D with treating capacity 200gpm, 500gpm, 1000gpm. GNMS-200D desander unit separation cut point is 15 microns, GNMS-500D desander unit separation cut point is 40 microns.

After TBM desander unit, the fluids can be recovered, if the silt is accumulated too much in the fluids, dewatering centrifuge unit should be used to separate the ultra fine solids, by using proper chemicals, most of the solids bigger than 1 microns can be separated out, the customer can get clear water recovery and dry solids for easier disposal. The unit can be installed inside standard container with windows, doors for less noise and sun/water proof. For less cost, the chemical dosing unit can be also installed on the dewatering centrifuge tank.

To prepare for new drilling fluids, the mud mixing tank should be applied. We can design mud mixing system with different mixing capacity and different chemicals according to client’s requirement. Recently 2 mud tank mixing system are ready for shipment for trenchless engineering company. Their mud mixing system including 2 package of mixing tank, the first tank with 1 transfer pump, 1 mixing pump with 1 mixing hopper ( venturi type), all of them are installed on one mud tank skid with pipelines and accessories. The second mixing tank with 1 transfer pump, 2 mixing pump with 1 venturi type mixing hopper, and 2 chemical mixing tank with mud agitator on top for better agitating. Each mixing pump with 1 individual control panel, the chemicals should be provided by customer based on their requirement.

For more information, pls contact with GN sales engineer.

WBM Waste treatment system

WBM waste treatment main equipments including drilling cuttings drying shaker, high speed/ VFD decanter centrifuge, drilling cuttings solidification unit, chemical dosing unit, the basical working process is as below:

2 units of drying shaker standard modular to be installed under the solids control shale shaker to pick up the water based mud drilling cuttings, the cuttings collection box is equipped for each drying shaker to collect the waste. The discharged fluids dropped into the catch tank under each drying shaker through shaker screens, the feeding pump transfer the fluids to VFD decanter centrifuge, which is installed on the telescopic skid with VFD control panel, the feeding pump is also installed on the centrifuge skid. The fluids from decanter centrifuge flow to intermediate tank ,the submersible slurry pump transfer the fluids back to solids control system reserve tank.

The discharged solids from drying shaker, decanter centrifuge, and the drilling waste collected by screw conveyor from desander, desilter, solids control decanter centrifuge are all feed to cuttings solidification unit, mixed with cement and lime (solidifying agent) in the vessel to get the dry disposal material, the solidified drilling waste can be used for landfill since the hazardous material will not leak, it is safe for landfill.
If the treated fluids will not be reused to prepare for new drilling fluids, and the user want to get pure water, chemical dosing system with VFD dewatering centrifuge will be used, the decanter centrifuge can separate cut point up to 1 microns by adding flocculants. The decanter centrifuge is drived by VFD control panel with self cooling system or air conditioner, which is positive pressurized, 3 VFD including main motor, back drive motor, pump motor.
If you need a customized solution for water based mud drilling waste treatment system, pls contact with GN solids sales engineer.

Oil sludge separation system installed successfully in Middle East

Several month ago, GN solids control shipped 2 sets of oil sludge separation system to Middle east client, now the oil sludge separation system has been installed successfully in the client’s site.

20170704 Oil Sludge Treatment 1
The complete oil sludge separation system including:
1)    Pre-mixing unit
The function of pre-mixing unit is increase the flowability and lower the viscosity of the oil sludge through the agitating and heating line, the boiler can provide the hot steam to the heating lines to heat the oil sludge. The oil sludge is storaged in the waste pit and it is transferred by vacuum pump to the pre-mixing tank. But the client needs a air compressor for the working of vacuum pump.

20170704 Oil Sludge Treatment 2

2)    Shaker tank unit
The shale shaker is special designed with cover to avoid the oily sludge splashing and there is hot water spray line to spray hot water to the shaker screen, to prevent the shaker screens from blocking, which will make the shale shaker working better.
3)    Decanter centrifuge separation unit

20170704 Oil Sludge Treatment 3
We provide different model decanter centrifuge with different treating capacity with oily sludge, right not we have 10m3/h decanter centrifuge and 20~25 m3/h decanter centrifuge. The VFD control panel is installed on the telescopic skid with the screw pump. The static mixer is used to mix the chemical before feeding to the centrifuge feed pipe.
4)    Chemical dosing unit
The chemical dosing unit is installed in the 20ft container for convenient operation and shipment.
5)    3 phase separation unit
The 3 phase separation unit including slant plate clarifier, gravity type oil water separator and micro bubble type oil water separator. The clear water and clear oil is flow to the water buffer tank and oil buffer tank. The water pump and oil pump will transfer the water and oil to the storage tank automatically once it is reach the setting value.