Method for removing deposited slag from crude oil trough and recovering oil from it

A technology for recovering oil and sludge is applied in the field of removing sludge in crude oil tanks and recovering oil therefrom, which can solve the problems of removal efficiency, cleaning time and economic benefits.

Inactive Publication Date: 2002-10-02
SK ENERGY CO LTD (KR)
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In addition to the techniques described, various methods of sludge removal and treatment exist

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for removing deposited slag from crude oil trough and recovering oil from it
  • Method for removing deposited slag from crude oil trough and recovering oil from it
  • Method for removing deposited slag from crude oil trough and recovering oil from it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Laboratory tests were performed to understand the mechanism of sludge melting in tanks. In a 3-liter beaker, the sludge was introduced until it reached a height of 10 cm, and heavy oil at atmospheric pressure equal to the volume of the sludge was placed on top of it. This way, the sludge will float to the surface, so a heavy tube was placed in the beaker to hold the sludge in place.

[0071] Atmospheric heavy oil is heated using a heat exchanger made of copper tubes, and water is circulated externally using a constant temperature bath as a heat source. The stirrer is centrally located and operates at a low speed of 20 rpm. Thus, the operating temperature is 65-80°C. A thermocouple with multiple tips was installed in the beaker to observe the change in the height of the sludge.

[0072] As a result of said test, it was determined that it takes about 4 hours to melt a sludge with a thickness of 10 cm, so this laboratory test can be scaled up to an actual refinery.

Embodiment 2

[0074] A test to detect the separation of inorganic substances in a separation tank.

[0075] Sludge and atmospheric heavy oil (B-C, referring to atmospheric heavy oil in high-sulfur crude oil storage tank) were mixed in a 1:4 volume ratio in a 3-liter glass decanter, melted and stirred at 80°C. The sample kept at 80°C in the oven was extracted over time, and the content of inorganic substances and combustion loss were measured by ICP (Inductively Coupled Plasma).

[0076]The vanadium contained in the sludge does not affect the separation by precipitation because it exists in a mixed state with hydrocarbons. Inorganic substances that can be separated by precipitation are rust components produced by tank corrosion and components contained in brine. The sludge contains thousands to tens of thousands of ppm iron.

[0077] Separation over time within the upper and middle layers as image 3 and Figure 4 shown. In the case of samples in the upper and middle layers, the iron co...

Embodiment 3

[0080] In order to prove the effect of the present invention, the present invention is applied to the actual process. A One-Through test was conducted using only 80°C atmospheric heavy oil as a heat source without heat exchangers and pumps, thereby preferably determining required investment and technical efficiency. The crude oil storage tank used is a 750,000bbl tank for storage of crude oil with high sulfur content. Before the test, the accumulated amount of sludge in the tank was about 2,450 tons (about 16,000 bbl, assuming a specific gravity of 1).

[0081] The main purpose of the trial was to demonstrate the efficiency of the sludge removal process, rather than using recovered oil, so 84,000 bbl of 80°C atmospheric heavy oil was used as the heat source to observe the sludge height. In this way, the volume ratio of atmospheric heavy oil to sludge is 5.3:1. The normal-pressure heavy oil is passed into the crude oil storage tank through conventional pipelines.

[0082] Dr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Disclosed is a method for recovering oil with various uses by removing sludge in crude oil storage tanks and separating inorganic substances from the heat transfer oil flowing out from the distillation tower of an oil refinery, wherein the heat transfer oil is such as atmospheric heavy oil, vacuum residue or Vacuum gas oil. The advantages of this method are that air pollution is minimized due to the use of a closed system, the cleaning time of crude oil storage tanks is significantly shortened, and sludge is removed continuously. In addition, the recovered oil can be used as fuel oil, bunker oil, or as a feedstock for secondary treatment processes such as heavy oil quality improvement processes.

Description

technical field [0001] This invention generally relates to methods for removing sludge that accumulates in crude oil tanks and recovering oil therefrom while crude oil is stored in a refinery. More particularly, the present invention relates to a method for recovering oil useful for various purposes by removing sludge in crude oil storage tanks using heat transfer oil such as Atmospheric heavy oil, vacuum residue and vacuum gas oil. Background technique [0002] In general, the term "crude oil" refers to untreated or unrefined oil collected from beneath the earth's surface. Problems arise if impurities settle on the bottom of the oil sump. Impurities come from various sources, and some of these impurities are inherent to the crude oil itself. Sludge is formed when pre-existing solids, and pipe and tank wall rust, and higher molecular weight hydrocarbons separate from the light hydrocarbons and settle to the bottom of the storage tank. This sludge exists as a stable emuls...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F11/00B01D17/00B08B9/093C02F11/12C10G1/00C10G1/04C10G31/00
CPCB08B9/093C10G1/00C10G31/00Y10T137/0419B01D17/00
Inventor 金明俊尹大锡崔彰效崔俊泰郭钟元朴成吉
Owner SK ENERGY CO LTD (KR)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap