Oily sludge treatment system and treatment method thereof

Abstract

The invention discloses an oily sludge treatment system and a treatment method thereof. The treatment system comprises crushing equipment, a vibrating screen, a precipitation device, an ejector, a high-speed crushing device, a water storage device and separation device for separating oil, water and sludge, wherein the crushing equipment is used for primarily crushing oily sludge and is provided with an oil slick space and a first oil slick outlet which can be opened and closed; the vibration screen is located at the upper part of the precipitation device; the precipitation device is used for precipitating the screened oily sludge; the high-speed crushing device is used for crushing the oily sludge into fine particles; the precipitation device is sequentially connected with the ejector, the high-speed crushing device and the separation equipment; a water outlet of the water storage device is connected with a water inlet of the ejector. The treatment system can be applicable to dewatering of various oily sludges, meanwhile, the oil rate of the oily sludge can be reduced to below 3%, oil can be recovered to the maximal extent and secondary pollution of wastewater is not generated.

Description

technical field [0001] The invention relates to a treatment system and a treatment method for oily sludge. Background technique [0002] Oil sludge mainly refers to the oily sludge formed by crude oil or other oil products and soil due to various reasons, as well as the oily sediment brought out by the system in the normal production of oilfields. It is a solid waste rich in mineral oil. The ingredients are crude oil, mud and water. The solid particle size can range from sub-micron to several inches. The composition of the oil depends on the type of crude oil, refinery structure and operating conditions. The composition of the sludge may change over time. Usually the sludge contains a certain amount of crude oil, heavy metal ions (such as iron, copper, nickel, etc.) and inorganic salt compounds. These oil sludges generally contain benzene series, phenols and other substances, and are accompanied by odor and toxicity. If they are directly in contact with the natural environ...

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Problems solved by technology

However, its core technology is a high-speed centrifugal three-phase separation device, which is basically monopolized by countries such as Europe and the United States. It is still difficult for China to produce such devices

Disadvantages of tempering-separation technology: due to the variety of oily sludge, the combination of existing dehydration machinery and agents is not universally applicable

However, this method is only suitable for crude oil recovery and treatment of ground crude oil and oil sands with high oil content and light emulsification, and it is not suitable for the treatment of oil sludge with severe emulsification; it needs to add a large amount of expensive chemical agents, resulting in high cost; processing The oil content in the residue after separation is high, and the water content of the sludge residue after separation is greater than 90% and contains a large amount of chemical agents, which will also cause secondary pollution problems such as waste water and waste residue, which need further treatment and utilization

[0009] In addition, although the above solvent extraction method, conditioning-mechanical separation method, chemical heat washing method and other methods can recover the oil resources in the sludge, there are many impurities in the oily sludge, including large stones, wood, etc. , metal objects, plastic objects, woven bags, etc., in the recycling process, the raw materials generally need to be screened and other pretreatments to remove impurities in the raw materials, and then mixed with chemicals; and due to the high viscosity of oily sludge, The debris and the soil are bonded to each other, and it is difficult to completely remove the debris by pretreatment, and the remaining debris will seriously hinder the normal operation of equipment and facilities

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