Month: May 2018

The intelligent control variable frequency positive pressure cabinet is integrated with HMI, PLC and frequency converter. It can realize the frequency conversion control mode of the mud centrifuge and make the operation more user-friendly. The customer can select different rotation speeds and differential rotation speeds according to the site material conditions.

The automatic control makes the equipment more widely applicable to the site. The customer sets the host speed 0-3200r/min according to different materials, and the differential speed is arbitrarily adjusted at 10-45r/min; the status screen automatically reminds the maintenance parts of the centrifuge maintenance parts and alarms. Make up for the staff’s negligence to bring about the damage to the equipment; The alarm screen shows the fault alarm when the electrical equipment has problems, which is the user can find the problem in time.

Positive pressure control cabinets operate much more clean instrument air than previous explosion-proof frequency conversion cabinets. For most customers, it seems more troublesome than explosion-proof explosion control cabinets. The following points are used as comparisons:

1. Performance and Heat Dissipation of Inverter (ABB Drive as an Example)

The inverter needs to dissipate a lot of heat during normal operation. The inverter requires the best performance at a constant temperature (typically 40-50°C). How can the heat be transmitted in a confined space? There are two types of heat. Methods; a) Heat exchange b) Cooling through the outside world.

1. A) Flameproof inverter is hot swap:
2. B) Positive pressure ventilation control cabinet
3. We speak from explosion-proof performance
4. A) Explosion-proof explosion-proof:

It is the explosive gas that can enter the shell, but the flame gas can not be transmitted to the outside through the joint surface during the explosion. That is, the explosion-proof body can prevent the flame inside the box from spreading out after the explosion, but the explosion inside the box will be damaged. Components are also a loss.

1. B) Positive pressure explosion-proof control cabinet

To ensure that the pressure of the instrument gas inside is higher than that of the outside world, that is, the pressure inside the box is higher than the outside of the box. The concentration of explosive gas outside the box cannot enter the inside of the box or the concentration of the explosive gas enters the explosion limit, so it is not Poor students will explode.

In general, the positive pressure explosion-proof control cabinet seems to be more troublesome than the explosion-proof control cabinet, but it is safe and reasonable.

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GN Solid Controls is committed to the design, development and manufacturing of high-performance industrial decanters. Horizontal spiral unloading sedimentation centrifuges have been widely used in various fields since the 19th century based on the same theory of centrifugal sedimentation. GN Solid Control can manufacture centrifuges with drum diameters as small as 220mm (9 inches) up to 760mm (30 inches), with an aspect ratio of up to 4.2 and a separation factor of up to 3000G. It is a professional manufacturer of decanters in the industry that has both the API certification for oil drilling industry and the EU export CE certification.

GN solid-controlled tunnel shield slurry slurry processing system is mainly composed of GNLW764A-VFD horizontal screw centrifuge and GNLR-10000S flocculation dosing system, GNGH-15C automatic curing system. It is characterized by strong waste disposal capacity, high efficiency, 24-hour continuous operation, and high automation. A complete system can realize remote operation or complete operation of one operator, low maintenance cost, compact footprint, and convenient module for transport lifting. The design eliminates manual disassembly and other aspects.

GN tunnel shield waste mud processing system specific workflow:

The working process of the whole system is as follows: Start the GNLW764A-VFD centrifuge module first, and after the centrifuge runs smoothly, start the liquid supply screw pump for the centrifuge, open the screw pump into the slurry valve, and extract the slurry from the customer storage tank to be treated. In this process, the dosing screw pump in the GNLR-10000S flocculation dosing system is started at the same time. There are two sets of drug supply pump lines, which can be directly supplied to the centrifuge inlet or supplied to the screw pump according to the effect of the centrifuge treatment. The slurry inlet is treated with flocculation to increase the centrifuge throughput and treatment efficiency. The solid phase processed by the centrifuge is discharged into the customer collection tank through the sand pit of the centrifuge. The dry slag is transported to the GNGH-15C automatic curing system through the conveying screw at the bottom of the collection tank for further drying treatment. The discharge can be processed below 20%. Solid dry residue with moisture content. The liquid that has been treated by the centrifuge reaches the customer’s requirements and the clean mud goes through the customer’s manifold and enters the wellhead or into the customer’s storage tank. This process is repeated to achieve the reuse of drilling fluid, or directly discharged into the municipal sewage pipe network for direct discharge. In order to achieve energy-saving emission reduction and environmental protection purposes.

As everyone knows, all countries are vigorously developing domestic infrastructure projects, such as the construction of high-speed railways and the expansion of urban construction. This has brought unprecedented opportunities and challenges to the construction of the project. In the rapid development of the past 10 years, There have been a lot of changes in China’s cities and transport facilities. At the same time, it has also brought a very heavy price to the environment, such as air pollution, indiscriminate discharge of urban sewage, and random discharge of wastewater from chemical plants. There is also the discharge of mud used in the construction process.

The mud contains a lot of chemical materials, and large or direct emissions will cause long-term damage to the local soil and environment, but this is indispensable in the construction process. One of the materials can now be considered from two aspects. The first to use a new type of mud material instead of the traditional mud material, the use of degradable additives, this is a long process that requires slow exploration and experimentation.

However, the country will not slow down or stop construction projects because of this. It is necessary to reduce the amount of mud used in the process to solve the problem. This requires us to change the traditional way of using natural sedimentation in the mud pool. This not only wastes a large amount of mud, but also causes great harm to the environmental pollution. Now GN Solid Controls has developed a mud cleaning system for domestic and foreign road construction through 10 years of research on the mud purification system and its absorption of foreign operations. The GNMS series mud cleaning system is now focused on. There are 30m3/h-360m3/h systems to meet the needs of customers in various countries.

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Regarding the HDD slurry recovery system, the horizontal directional crossing construction method is relatively short at home and even internationally. Therefore, there is no perfect system for the horizontal directional crossing of mud solids and control that belongs to the industry. The mud solids control technologies at home and abroad are basically derived from the solid-control programs on the oil fields, and then simplified absorption. Therefore, the mud solids control process for non-digging and directional crossing is still very similar to that of oil fields. The main methods are dilution with water, sedimentation, and mechanical screening.

The first kind: The dilution method is to recover the mud returned from the traversing process to the storage tank, and then add water, bentonite, etc. The deployment of chemical drugs to the required mud properties also increases the amount of mud, so as to reduce the amount of mud. The solid content. The characteristics of this method are: simple operation and low cost. The disadvantage is that it does not fundamentally solve the solid content problem and cannot completely remove the solid content.

Second, the precipitation method is to dig one or more mud pits at the point where the traverse passes through, and at the point of entry, to store the slurry that comes back through the course of the process. The slurry is left for a period of time, and the natural phase sinks according to the physical material. , Then use the pump to suck mud slurry from the upper mud pit and re-inject it into the rig for recycling. This method is characterized by: simple operation, reduced energy consumption, low cost, the disadvantage is that the mud pit covers an area of large, long time precipitation, the separation is not complete, the solid phase remains in the bottom of the pit is not good to clean the environment pollution.

The third type: mechanical screening method. It is the solid phase control of returning slurry using our common mud recovery system. Mud recovery systems include vibrating screens, de-sanders, desilters, centrifuges, mud tanks and other equipment to form a system for grading the mud until the mud is used. Under normal conditions, mechanical screening is the most convenient and reliable method, and it also protects the surrounding environment.

With the development of directional crossing industry and people’s requirements on cost and environment, the method of mechanical screening will be used more and more widely in engineering. This will also be the law of the development of the industry.

Oily sludge refers to a mixture of oil, water, and solids. In order to treat the sludge and recover the oil and water, it is necessary to separate the oil, water and solids. At the same time, how to dispose of solids at a lower cost, and it is very important to recycle as much oil as possible. The specialized centrifuges, oil-water separators, and thermal desorption systems designed by Crown Energy Solid Controls are specifically designed to process sludge oil sands. of.

From the source, the oil-containing sludge can be divided into: (1) waste oil sands produced by cleanup of crude oil tanks, (2) waste oil sands of oil refineries, and (3) drilling waste oil sands.

For the different sources of oily sludge, each customer’s treatment is going to be different, GN solid control will configure reasonable treatment equipment according to the specific requirements.
The core processing equipment mainly includes:
1. Drilling fluid vibrating screen for separating coarser solid particles, a number of patented designs, excitation intensity up to 8.0G, and optional anti-splash sealing system, hot wash spray system, which can effectively remove large particles The surface is oily.
Drilling fluid shaker
2. Centrifuge for separating finer solid particles and oil water, using a number of patented technologies and top-level materials and processes, imported bearings and components of internationally renowned brands to improve the stability of the equipment and prolong its service life.

3. The oil-water separator used to separate the two liquid phases can be equipped with various oil-water separation devices, such as ultrasonic and air floatation, to meet the processing requirements of various customers.

4. Thermal desorption system can reduce the oil content on solids to 0.3%, learn from foreign advanced technology, combine with the actual situation in the domestic market, through the continuous innovation of the R&D team, environmental protection design, no secondary pollution, energy consumption Low, safe and reliable.