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Method and device for synchronously dehydrating and recycling oil from oil-containing sludge

A technology for recovering oil and oil sludge, which is applied in water/sludge/sewage treatment, sludge treatment, pyrolysis treatment of sludge, etc. It can solve the problems of high biological toxicity of organic wastewater, high treatment difficulty, and difficulty in oil recovery. , to achieve good dehydration effect, realize resource recovery, and improve the effect of recovery rate

Active Publication Date: 2018-11-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few well-established hydrothermal treatment processes for oily sludge, the reaction temperature is usually high, oil recovery is difficult, and the organic wastewater produced is highly toxic and difficult to treat

Method used

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  • Method and device for synchronously dehydrating and recycling oil from oil-containing sludge

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Experimental program
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Effect test

Embodiment 1

[0045] This embodiment provides a device for synchronously dehydrating and recovering oil from oily sludge, the device comprising:

[0046] Preheating unit, reaction unit, flash unit, dehydration unit and recovery unit;

[0047] The preheating unit, the reaction unit, the flash unit and the dehydration unit are connected in sequence;

[0048] The preheating unit is used to preheat the oily sludge and conditioning agents;

[0049] The reaction unit is used for heating and stirring to make the oily sludge and conditioning agent undergo thermal hydrolysis reaction;

[0050] The flash unit is used for the separation of water vapor, oil gas and solid phase residue, and the flash steam generated by the flash unit is returned to the preheating unit for heat recovery;

[0051] The dehydration unit is used for removing water from the oily sludge; the recovery unit is used for stratifying the liquid phase oil-water mixture and recovering the oil phase.

[0052] In a preferred embodimen...

Embodiment 2

[0054] This embodiment provides a method for synchronously dehydrating and recovering oil from oily sludge, which uses the device in Embodiment 1, and specifically includes the following steps:

[0055] Step 1, the scum sludge (moisture content 80-85%) 500g and 2.5g conditioning agent (5% calcium oxide, 70% sodium chloride and 25% lauryl Sodium sulfate) is injected into the preheating tank and preheated to 90-99°C;

[0056] Step 2: Inject the preheated mixture of oily sludge and conditioning agent into a hydrothermal reactor, heat the sludge to 120-180°C by electric heating, and react for 20-50 minutes to obtain hydrothermal sludge;

[0057] Step 3: Rapidly inject the hydrothermal oil sludge into the flash tank to separate water vapor, oil gas and solid phase residue, and the generated flash steam is returned to the preheating tank in step 1 to realize heat recovery; the separated flash oil sludge enters the high pressure Press filtration and dehydration in the filter press t...

Embodiment 3

[0060] This embodiment provides a method for synchronously dehydrating and recovering oil from oily sludge, which uses the device in Embodiment 1, and specifically includes the following steps:

[0061] Step 1, the scum sludge (moisture content 75%-80%) 500g and 5g conditioning agent (5% calcium oxide, 70% sodium carbonate and 25% dodecylsulfuric acid) of a certain oil production plant in Xinjiang Oilfield Sodium) is injected into the preheating tank and preheated to 90-99°C;

[0062] Step 2: Inject the preheated mixture of oily sludge and conditioning agent into the hydrothermal reaction kettle, feed 0.45-1.45MPa saturated steam, and react for 10-40 minutes to obtain hydrothermal oil sludge;

[0063] Step 3: Rapidly inject the hydrothermal oil sludge into the flash tank to separate water vapor, oil gas and solid phase residue, and the generated flash steam is returned to the preheating tank in step 1 to realize heat recovery; the separated flash oil sludge enters the high pre...

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Abstract

The invention provides a method and a device for synchronously dehydrating and recycling oil from oil-containing sludge. The method comprises the following steps: mixing oil-containing sludge with a conditioning chemical, and preheating; further heating the oil-containing sludge and the conditioning chemical to carry out a hydrothermal reaction so as to obtain hydrothermal oil sludge; carrying outflash evaporation rapidly to achieve separation of steam, oil gases and solid-phase residues, wherein generated flash vapor is adopted for preheating to achieve heat recycling; carrying out filter pressing dehydration on separated flash evaporation oil sludge, thereby obtaining a solid-phase residue and liquid-phase oil-water mixture; and standing and layering the oil-water mixture, recycling oilfrom an upper layer, and recycling organic wastewater from a lower layer, wherein the conditioning chemical is composed of a heat-sensitive metal oxide, a catalyst and a demulsifier. By adopting theprocess, good reduction and oil recycling effects can be achieved at a low hydrothermal temperature, the reaction energy consumption can be greatly reduced, the COD (Chemical Oxygen Demand) of a generated waste liquid can be greatly reduced, in addition, the toxicity is degraded, and biochemical treatment can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of environmental protection in the petroleum and petrochemical industry, and relates to a method and a device for synchronously dehydrating and recovering oil from oily sludge. Background technique [0002] Oilfields and refineries produce and accumulate a large amount of oily sludge every year, such as tank bottom sludge produced in dehydration of crude oil, dehydration tanks, oil storage tanks and waste oil tanks, and oil separation produced in sewage treatment plants of oilfields and refineries Tank bottom sludge, flotation tank scum and biochemical sludge, etc. These sludges generally have high oil content (3-50%) and complex components; and the sludge particles are fine, in the form of flocs, with high water content and strong water holding capacity. Mud, oil, and water are wrapped together and fully emulsified. Larger, difficult to dehydrate, and difficult to achieve three-phase separation of oil-wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/12C10G1/00C02F103/10C02F103/36
CPCC02F11/10C02F11/122C02F2103/10C02F2103/365C02F2303/06C10G1/00C10G2300/1003C10G2300/70
Inventor 仝坤张哲娜张明栋孙静文谢水祥任雯刘晓辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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