PLC Touch Screen Control Sludge Dewatering Horizontal Oil Sludge Centrifuge
Brand Name:ZK SEPARATION
Certification:ISO9000
Model Number:LW or LWS
Minimum Order Quantity:1
Delivery Time:1-3months
Payment Terms:L/C, T/T
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Chengdu Sichuan China
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No. 1355 , Longgong South Road ,Chengdu Economic And Tech .& Dev. Zone , Sichuan ,China
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Product Details
PLC Touch Screen Control Sludge Dewatering Horizontal Oil Sludge
Centrifuge
I. Oily sludge treatment
Production of oily sludge
Sludge treatment is a complete set of production process, using the
principle of oxidative demulsification and centrifugal separation.
Its main equipment is composed of dosing system, feeding system,
separation system, conveying system, and control system.
After the oily sludge is collected and heated by steam, a suitable
number of additives like demulsifier and active agent are added in
it, so that the oily water in the emulsified state is broken. After
demulsification, a high-efficiency LWS series three-phase
centrifuge is adopted to realize the continuous separation of oil,
water, and slag in the oily sludge, and the water separated and the
oil-water mixture not demulsified are directly sent to the sewage
treatment system for treatment. Then, a LW series two-phase
centrifuge with high efficiency is used for dehydration. The crude
oil residue in the dehydrated slag phase can be recovered by the
combustion or thermal desorption process. The separated crude oil
is collected and then purified by a three-phase flottweg separator.
The purified oil can be reused.
Separation performance:
1, About 80~90% oil can be recovered (relating to oil density,
demulsification effect, temperature, etc.), and the recovered oil
can be used for refining purpose after further purified by the
flottweg separator;
2, The water content of the oil phase after separation can reach ≤3
~ 5%;
3, The dryness of the slag phase after centrifugation can reach 40
~ 60%, and its total volume is reduced by over 80% compared to that
before separation;
★ Three-phase centrifuge model and technical parameters
Item | Unit | LWS250×1025B(X) | LWS350×1435B(X) | LWS450×1845B(X) | LWS520×2150B(X) | LWS580×2400B(X) | LWS650×2600B(X) |
Throughput | m3/h | ≥1 | ≥3~5 | ≥5-10 | ≥10-15 | ≥15-20 | ≥20-30 |
Roller diameter | mm | 250 | 350 | 450 | 520 | 580 | 650 |
Length-to-diameter ratio | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4 | |
Speed | rpm | 5000 | 4000 | 3500 | 3200 | 3000 | 2800 |
Separation factor | 3500 | 3136 | 3087 | 2982 | 2948 | 2854 | |
Differential speed | rpm | 1~50 | 1~35 | 1~34 | 1~34 | 1~30 | 1~27 |
Main motor power | kW | 11 | 22 | 30 | 45 | 55/75 | 75/90 |
Ancillary motor power (kW) | kW | 4 | 5.5 | 7.5 | 15 | 18.5 | 22 |
Weight | kg | 1250 | 2500 | 4000 | 5200 | 6500 | 8000 |
Boundary dimension (L×W×H) | mm | 2500×800×1150 | 3700×1050×1400 | 3800×1150×1600 | 4800×1250×1800 | 5300×1750×1382 | 5600×1850×1500 |
Note: The throughput is related to material characteristics.
X" indicates that the heavy phase liquid is discharged by the centripetal pump with back pressure;
The overall dimensions will vary depending on the way the centrifuge is drained.
X" indicates that the heavy phase liquid is discharged by the centripetal pump with back pressure;
The overall dimensions will vary depending on the way the centrifuge is drained.
★ Two-phase centrifuge model and technical parameters
Item | Unit | LW250×1025B | LW350×1435B | LW450×1845B | LW520×2150B | LW580×2400B |
Throughput | m3/h | 0.5-3 | 3~10 | 8~15 | 15-20 | 20-30 |
Roller diameter | mm | 250 | 350 | 450 | 520 | 580 |
Length-to-diameter ratio | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | |
Speed | rpm | 5000 | 4000 | 3200 | 3000 | 2800 |
Separation factor | 3500 | 3136 | 2580 | 2620 | 2546 | |
Differential speed | rpm | 1~50 | 1~35 | 1~34 | 1~34 | 1~36 |
Main motor power | kW | 11 | 22 | 30-37 | 45-55 | 75-90 |
Ancillary motor power (kW) | kW | 4 | 5.5 | 7.5 | 15 | 18.5 |
Weight | kg | 1250 | 2500 | 4200 | 5200 | 6500 |
Boundary dimension (L*W*H) | mm | 2500×800×1150 | 3700×1050×1200 | 4300×1150×1450 | 5100×1250×1600 | 5520×1450×1700 |
| Note: The throughput is related to material characteristics. | ||||||
Oily sludge treatment system diagram
II. Oily (waste) water treatment
At present, the oily (waste) water generated in the course of
processing crude oil in the refinery is often treated by rough
flocculation + dehydration. The slag phase is directly incinerated
after dehydration. This treatment mode causes waste of crude oil
resources. Now we can apply a series of pretreatment processes
(adding demulsifier, surfactant, etc.) and then use the
high-efficiency LWS series three-phase centrifuge to realize the
reuse of crude oil resources.
After the oily (waste) water is collected, a suitable amount of
demulsifier, an active agent, etc. are added, so that the oily
water in the emulsified state is broken, and the oily (waste) water
after demulsification is naturally settled and separated in an oil
trap. The water in the middle layer of the oil trap and the
oil-water mixture not demulsified are directly sent to the sewage
treatment system for treatment. The task of dehydration can be
completed by the high efficiency LW series two-phase centrifuge.
The oil floating on the upper layer of the oil trap and the sludge
settled on the bottom layer are collected and sent into the
stirring tank for further treatment. The oil, water, and slag in
the oily sludge treated can be separated continuously from each
other through the high-efficiency LWS series three-phase
centrifuge.
For the treatment of oily (waste) water, the purpose is to recover
more oil and reduce the oil content in the solid. Therefore, the
role of each section in the whole process system is very important.
1. Demulsifier and surfactant can improve the efficiency of
demulsification, enhance the subsequent separation efficiency,
increase the oil recovery rate, and reduce the oil content in the
slag phase.
2. Heating can reduce oil viscosity, improve the oil recovery rate,
and lower the solid contents of oil and water.
3. Adding PAM flocculant can increase the solid recovery rate and
reduce the solid content in the liquid phase.
4. Separation of oil, water, and slag with the high-efficiency LWS
series three-phase centrifuge can improve the separation
efficiency, enhance the oil recovery rate, and reduce the oil
content of the slag phase.
5.Solid-liquid separation realized by using a high-efficiency LW
series two-phase centrifuge can reduce the liquid content of the
slag phase, facilitate transportation, and increase the combustion
heat value.
Separation performance:
1. About 80~95% oil can be recovered (relating to oil density,
demulsification effect, temperature, etc.), and the recovered oil
can be used for refining purpose after further purified by the
flottweg separator;
2, The water content of the oil phase after separation can reach ≤3
~ 5%;
3, The dryness of the slag phase after centrifugation can reach 40
~ 60%, and its total volume is reduced by over 80% compared to that
before separation;
Oily wastewater treatment flow chart
III. Drilling oil-based mud solid-waste treatment
Oilfield drilling requires drilling oil-based mud according to the
drilling depth and geological conditions. The mud's basic
composition is oil, water, organic clay, and oil-soluble chemical
treatment agent. OBM resists high temperature and calcium salt
erosion, which is beneficial to the stability and lubrication of
the well wall. The mud features good performance and small damage
to oil and gas layers, and wide application in various types of
drilling platforms. However, the slag generated in the equipment of
drilling solid control system (vibrating screen, centrifuge, and
dryer) has seriously affected the environmental safety and must be
treated in a harmless manner. After treatment, the oil content of
the slag is less than 1% and the oil is further purified and
reused.
The collected drilling OBM solid wastewater is subjected to
high-speed stirring in proportion, and a suitable amount of
demulsifier, active agent, and other additives are added, so that
the oily water in the emulsified state is broken. The vibrating
screen is used before separation to remove large particles of soil,
sand, glass bottles, mineral water bottles, convenient bags, gauze,
and other solid wastes, and then the high-efficiency LW series
two-phase centrifuge is adopted to separate continuously the (oil +
water) + slag. After heated by steam, the separated liquid phase
enters the sedimentation tank, in which the supernatant is removed,
and the liquid phase settled at the bottom of the tank is mixed
with the slag phase separated by the centrifuge. The residual oil
is recovered by the thermal desorption process.
Separation performance:
1,It can recover about 90% of oil (relating to demulsification
effect, temperature, etc.);
2,The solid content of the liquid phase after separation can reach
≤5~8%;
3,The dryness of the slag phase after separation can reach 40 ~
60%;
Drilling oil-based mud solid waste treatment process
IV. Technical descriptions of the centrifuge
★ Extremely low infrastructure investment and good on-site operating
environment
Compared with the conventional filter-type equipment
(plate-and-frame filter, belt machine, etc.), the high-performance
centrifuge is compact and efficient, covering only about a third of
land, needless of auxiliary gas source, high-pressure water, and
with simpler pipe structures at the inlet and outlet. Moreover, the
operation environment is more humanized, and the skid-mounted
integrated device has the characteristics of compact structure,
convenient installation, low requirements for infrastructure, and
convenient movement. The centrifuge is widely used in the harmless
treatment of oily sludge in oilfield drilling.
★ Stable operation, low failure rate, and low maintenance cost
Compared with the filter type equipment, the centrifuge does not
require any filter cloth or filter screen, so as to avoid the
trouble of clogging and of replacing the filter cloth. The
operation and maintenance costs of the equipment are low.
★ Modular design, easy to operate
Our design philosophy: To lower the requirements on the skills,
educational level, and labor intensity of operators, and realize
one-button start and stop of the control system, fault
self-diagnosis, and safety self-protection.
★ Operator configuration and labor intensity
The high-performance centrifuge is an automatic and continuous
working mode for feeding-separating-slag (liquid) discharging. The
whole process requires no human intervention. Multiple sets of
equipment require only one inspector (in conjunction with other
positions). Unlike frame and plate-and-frame filter, the slag
discharging process does not require manual cutting, greatly
reducing the labor intensity of the operator.
★ Ingenious, unique, and diversified heavy liquid-phase discharging
structure
The heavy liquid phase separated by the three-phase centrifuge can
adopt two different liquid discharging modes, namely gravity
discharging and discharging through the built-in centripetal pump
with pressure, wherein the latter includes liquid layer fixed mode
and the online adjustable mode of heavy phase liquid layer, which
is selected according to the process conditions.
★ High performance wear-and corrosion-resistant cemented carbide
As the oily sludge contains a lot of hard particles and impurities
such as sand, glass, and metal, if the centrifuge does not adopt
reliable wear-resistant configuration, its service life and running
stability will be seriously affected. The wear-resistant solution
is completely targeted. According to the material characteristics
(pH value, corrosive substance, solid particle size hardness,
etc.), cemented carbide or ceramic can be selected, and the
cemented carbide can be either YG6, YG8, or various modified
tungsten-cobalt alloys with the hardness of 89~93 (HRA), which can
fully meet the application fields of the centrifuge.
★ High performance stainless steel
The high-performance three-phase centrifuge can recover oil by
90%~95% and adapts to the liquid density difference (oil and water
comparison) of the gas and oil of different densities (0.1~0.08
g/cm3). The centrifuge needs more than 3000G separation factor to
achieve better separation. To ensure the stability and the service
life of the centrifuge, high-strength corrosion-resistant duplex
stainless steel SAF2205 is used.
★ High-dryness screw conveyor and drum structure
The dehydration of solid particles relies mainly on strong
centrifugal force, high-torque screw extrusion force (pushing
torque), and ultra-long solid particle dehydration length. The
centrifuge can generate centrifugal force exceeding 3000G, 30 ~ 50%
higher than the screw pushing torque of common centrifuges. The
screw pusher torque, and the drum dehydration length is 10 ~ 20%
longer than that of common centrifuges.
★ High torque involute planetary gear differential
The ultra-high pushing torque requires a high-torque involute
planetary gear differential as the foundation. The differential
equipped on the centrifuge features high torque, high speed, low
heat generation, and excellent heat dispersion, which ensure that
the centrifuge can be used for a long time and stably.
Double-motor double-frequency conversion common DC bus constant
torque control technology
★ CIP washing system
The fully automatic control system is equipped with a CIP washing
system, which can effectively solve the problem that it is not
completely cleaned during the shutdown process and effectively
avoid the equipment troubles caused by artificial factors.
★ Humanized centrifugal configuration
Spiral bearing (in the drum, concealed) lubrication technology: the
lubricant is filled from the outside of the hood. (Unique
technology in domestic centrifuges) The hood adopts a hinged
opening structure and is equipped with a high-pressure gas strut to
assist the opening.
Vibration and temperature sensor (optional) at the position of the
main bearing housing.
★ Light phase liquid layer adjustment technology
From the current three-phase centrifuge structure for liquid
transportation of centripetal pumps adopted at home and abroad, the
adjustment of the light phase liquid layer requires disassembling
the centrifuge, and replacement takes more than 8 hours. The
centrifuge, with the patented technology of our company, just
requires opening the hood to adjust the light phase liquid layer.
★ Variable pitch technology
Variable pitch technology is a relatively advanced technology in
the world. It can effectively reduce the screw pushing torque,
improve the processing capacity, and further reduce the sediment
water content.
★ Constant torque control technology
The constant torque control of the centrifuge is the most advanced
control mode in the world. The real-time monitoring of the actual
output torque of the constant torque variable frequency motor
through the high-performance auxiliary inverter is compared with
the set torque value, and PID is used to adjust the material
pushing speed of the screw conveyor in real time. The centrifuge
can achieve continuous, stable, and economic operation.
PLC Touch Screen Control Sludge Dewatering Horizontal Oil Sludge Centrifuge
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