High Efficiency Oil Sludge Treatment Separation Sludge Centrifuge

Ground Sludge, Tank Bottom Oil Sludge Treatment Separation Sludge Centrifuge

Treatment of ground sludge, sludge at the tank bottom of the oil-gas combined station, and oily sludge in the sedimentation tank

★ Production of ground sludge

During the drilling and test spraying of the oil exploitation process, a large amount of crude oil falls to the ground and is mixed with soil, sand, water, and other substances to form an oil-soil mixture, which is called ground sludge; according to the nature of the crude oil, the sludge can be divided into heavy sludge and thin sludge; according to the storage time, it can also be divided into fresh sludge and accumulated sludge. The oil content of the ground sludge can generally be 10~30%. Because there are all kinds of domestic garbage at the oil production site, the sludge, in addition to soil and sand, is mixed with other domestic wastes and solid wastes like glass bottles, mineral water bottles, convenient bags, and gauze.

★ Production of sludge at the tank bottom of the oil-gas combined station

If crude oil is stored for a long time in the tank of the oil-gas combined station, the inorganic impurities such as high melting point wax, asphaltene, colloid, and entrained mud and sand in the crude oil will become precipitates together with water, forming oily sludge at the bottom of the tank so as to reduce the effective volume of the tank. And such sludge is called sludge at the tank bottom of the oil-gas combined station.

★ Production of oily sludge in the sedimentation tank

The waste oil from refineries, petrochemical plants, and other industries is usually dumped directly into large sedimentation tanks. The oily sludge produced via sedimentation is called oily sludge in the sedimentation tank.

★ Method 1: adopt the high-efficiency LW series two-phase centrifuge treatment plan

After the oily (waste) water 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, the oily (waste) water is naturally settled and separated via the oil trap.

The oil floating on the upper layer of the oil trap is collected and sent to the oil tank to be further treated, while the water in the middle layer of the oil trap, the oil-water mixture not demulsified, and the sludge settled on the bottom layer are collected and sent to the stirring tank for further treatment. Then, a high efficiency LW series two-phase centrifuge is used to separate continuously the (oil+water)+slag; the water separated and the oil-water mixture not demulsified are treated via the sewage treatment system. The high efficiency LW series two-phase centrifuge can be used to fulfill the task of dehydration. After that, the crude oil residue in the slag phase can be recovered through the combustion or thermo desorption process. Before the ground sludge is heated and broken, it needs to be screened by vibration to remove large mud particles, sand, glass bottles, mineral water bottles, convenient bags, gauze, and other solid wastes. After pulping and demulsification, the large particles of sand and stone can be further removed through the vibrating screen and sent to the centrifuge for separation.

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. The use of the high-efficiency LW 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 70~85% 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 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;

Two-phase separation process flow for treatment of ground sludge, sludge at the tank bottom of

the oil-gas combined station, and oily sludge in the sedimentation tank

Method 2: adopt the high-efficiency LWS series three-phase centrifuge treatment plan

After the oily (waste) water is collected and heated by steam, a suitable amount of demulsifier and active agent are added, so that the oily water in the emulsified state is broken. The oil, water, and slag in the oily (waste) water after demulsification is continuously separated from each other with the high-efficiency LWS series three-phase centrifuge. The water separated and the oil-water mixture not demulsified are directly sent to the sewage treatment system for treatment. The task of dehydration can be realized through the LW series two-phase centrifuge. The crude oil residue in the dehydrated slag phase can be recovered by the combustion or thermal desorption process, and the separated oil can be collected and used as crude oil.

Before the ground sludge is heated and broken, it needs to be screened by vibration to remove large mud particles, sand, glass bottles, mineral water bottles, convenient bags, gauze, and other solid wastes. After pulping and demulsification, the large particles of sand and stone can be further removed through the vibrating screen and sent to the centrifuge for separation.

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 separation process flow for treatment of ground sludge, sludge at the tank bottom of

the oil-gas combined station, and oily sludge in the sedimentation tank