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A deep extraction and coking process for oily sludge

A treatment process and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc. Use restrictions and other issues to achieve the effect of reducing volume and quality, realizing recycling and utilization, and reducing impact

Active Publication Date: 2015-10-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology puts too much solid residue into the coking unit, which will affect the volatile content and ash index of coke, and affect the quality of petroleum coke
Especially for enterprises producing high-quality petroleum coke, the use of this technology is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The extraction solvent formula is as follows: the main agent of the extraction solvent is distillate oil with a boiling range of naphtha 110-135°C, accounting for 95%; the auxiliary agent is distillate oil with a boiling range of 140-150°C, accounting for 4%; Distillate oil with a range of 80-100°C, accounting for 1%, constitutes a composite extractant. After mechanical dehydration, the oily sludge produced by a refinery sewage treatment plant has a water content of 76.6wt%, an oil content of 17.6%, and a solid content of 5.1%. Send the sludge into the squeezer, the squeezing temperature is 25°C, and the pressure is 28MPa. After squeezing for 30 minutes, the water content of the generated mud cake is 18.6%, and the oil content is 59.6%. It is mixed with the composite extraction solvent at a ratio of 1:10 for 30 minutes (temperature 30°C), after the extraction is finished, the solid-liquid mixture is sent to the centrifugal separator, the separated liquid phase is sent t...

Embodiment 2

[0038] The formula of the extraction solvent is as follows: the main agent of the extraction solvent is distillate oil with a boiling range of naphtha 110-135°C, accounting for 90%; the auxiliary agent is distillate oil with a boiling range of 140-150°C, accounting for 8%; Distillate oil with a range of 80-100°C, accounting for 2%, constitutes a composite extractant. After mechanical dehydration, the oily sludge produced by an oil refinery sewage treatment plant has a water content of 79.5wt%, an oil content of 16.7%, and a solid content of 4.7%. After the sludge is squeezed (pressing temperature is 25°C, pressure is 26MPa, squeezed for 20 minutes, the water content of the resulting mud cake is 23.4%, oil content is 52.6%, and it is mixed and extracted with the composite extraction solvent at a ratio of 1:8 (temperature is 70°C , time 15min), after the extraction is finished, the solid-liquid mixture is sent to the centrifugal separator, the separated liquid phase is sent to t...

Embodiment 3

[0042] The formula of the extraction solvent is as follows: the main agent of the extraction solvent is distillate oil with a boiling range of 110-135°C of naphtha, accounting for 92%; the auxiliary agent is selected from distillate oil with a boiling range of 140-150°C, accounting for 8%; agent. After mechanical dehydration, the oily sludge produced by a refinery sewage treatment plant has a water content of 79.5wt%, an oil content of 16.7%, and a solid content of 4.7%. After the sludge is squeezed (pressing temperature is 25°C, pressure is 29MPa, and pressing is 40min), the water content of the sludge cake is 16.2%, and the oil content is 59.8%. , time 30min), after the extraction is finished, the solid-liquid mixture is sent to the centrifugal separator, the separated liquid phase is sent to the coking device, and the solid phase is sent to the rotary kiln evaporator, at a temperature of 160°C and a pressure of 60kpa (absolute After evaporating for 72 minutes under pressur...

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Abstract

The invention relates to a treatment process of oil-containing sludge, and is especially applicable to the oil-containing sludge produced in a wastewater treatment course of an oil refinery. The treatment process comprises the following steps: centrifugally dehydrated oil-containing sludge is subjected to a physical squeezing method to destroy a water, oil and solid stabilizing system of the oil-containing sludge, a material generated after squeezing is subjected to solvent extraction treatment, the extracted material is subjected to solid-liquid separation, the separated liquid phase is sent into a delayed coking device, a solid phase obtained after separation and drying can be used as agricultural sludge after mixing combustion with fuel coal, and wastewater generated in the procedure reaches standards after biochemical treatment and is discharged. The treatment process is mainly characterized in that the sludge treatment process has short procedures, low energy consumption, good extraction effect, mild operation conditions, good oil sludge treatment effect, and simple equipment operation and maintenance.

Description

technical field [0001] The invention relates to a process for treating oily sludge, in particular to a process for coking the oily sludge produced in oil refineries and refinery sewage treatment plants after deep extraction. Background technique [0002] Refining and chemical enterprises produce a large amount of oily sludge in the process of petroleum refining and wastewater treatment, which mainly come from grease traps, flotation tanks, excess activated sludge, crude oil dehydration tanks, oil storage tanks and waste oil tanks. These sludges are complex in composition and belong to a relatively stable multi-phase system with sufficient mixing and high viscosity. It is difficult for the solid phase to settle completely, and it is difficult to treat oily sludge. At present, in my country's petrochemical industry, an average of 800,000 tons of oily sludge is produced every year. With the continuous expansion of the scale of production equipment of enterprises, the correspon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/12C10L5/46
CPCY02E50/10Y02E50/30
Inventor 巫树锋刘发强赵保全刘光利任立鹏梁宝锋李常青杨岳江岩王军贾媛媛何琳张媛文善雄荣树茂周霞
Owner PETROCHINA CO LTD
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