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Method for treating oil sludge

A treatment method and oil sludge technology, which is applied in the direction of sludge treatment through temperature control, dehydration/drying/thickening sludge treatment, pyrolysis treatment of sludge, etc., can solve high energy consumption, low investment and operating costs, and non-centimeter utilization and other problems, to achieve the effect of high processing efficiency, small equipment scale and good economy

Active Publication Date: 2013-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is simple, does not require special equipment, and has low investment and operating costs. It not only effectively treats the oily sludge, but also fully utilizes the valuable components in it, and does not bring adverse effects to the post-treatment device, but the energy consumption is relatively high. High, non-centimeter Utilization of various valuable components in oil sludge

Method used

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  • Method for treating oil sludge

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Embodiment 1

[0017] The specific embodiment of the present invention is described by taking oil sludge at the bottom of a refinery oil tank as an example. The present invention is particularly suitable for oily sludge with high water content, so the selected oily sludge contains 75.5% water, 14.2% oil, and the rest is solid matter (the percentage involved in the present invention is based on weight).

[0018] The sludge is pumped into the dewatering tank. The dehydration tank is externally connected with a microwave radiation device. The microwave radiation frequency is 2450MHz and the power is 800W. Radiation time 40min / m 3 . After microwave demulsification and dehydration, the moisture content of sludge can be reduced to 32%. The dehydrated oil sludge is heated to 250°C and sent to the flash tower for flash evaporation. Water vapor and light hydrocarbon vapor are obtained at the top of the tower, which are condensed and separated by an oil-water separator to obtain light oil, and th...

Embodiment 2

[0020] The specific embodiment of the present invention is described by taking oil sludge at the bottom of a refinery oil tank as an example. Oil sludge contains 45% oil, 41% water, and the rest is solid matter. Process flow is with embodiment 1. The microwave radiation frequency is 2450MHz and the power is 1500W. Radiation time 15min / m 3 . After microwave demulsification and dehydration, the moisture content of sludge can be reduced to 15%. The heating temperature for the flash treatment is 200°C. The steam distillation is at 450°C and the pressure is controlled at 0.3MPa. The final oil recovery was 97.4%.

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Abstract

The invention discloses a method for treating oil sludge. The method realizes oil sludge integrated treatment by utilization of microwave demulsification dehydration, heat treatment flash evaporation and steam distillation. Concretely, the method comprises the following steps of 1, carrying out a microwave pretreatment demulsification dehydration process on oil sludge to reduce water content of the oil sludge, 2, heating the oil sludge subjected to the microwave pretreatment demulsification dehydration process to a temperature of 100 to 300 DEG C in an oxygen-free environment, feeding the heated oil sludge into a separating column, carrying out a heat treatment flash evaporation process, through condensation, recovering a light oil component and water separated by the heat treatment flashevaporation, and taking out sludge comprising a heavy oil component and solids from the separating column, and 3, carrying out solid-liquid separation of the sludge in the bottom of the separating column, recovering the heavy oil component as a coking or catalytic cracking raw material, and carrying out a steam distillation process on the solids to further recover an oil component from the solids. The method can realize full recovery of various valuable components of oil sludge and has good industrial application economical efficiency.

Description

technical field [0001] The invention relates to a method for treating 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 size of solid particles can range from sub-microns to several inches, most of which are between 1 and 100 microns. The composition of oil depends on the type of crude oil, refinery structure and operating conditions. The composition of sludge may change over time. Usually the sludge contains a certain amount of crude oil (5% to 80% in mass concentration), heavy metal ions (such as iron, copper, nickel, etc.) and inorganic salts (5% to 20% in mass concentration) compounds, etc. These oil sludges generally contain benzene series, phenols and other substances, and ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/10C02F11/12C02F11/18
Inventor 赵昕回军赵景霞
Owner CHINA PETROLEUM & CHEM CORP
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