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A kind of harmless treatment method of oily sludge

A treatment method and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of high organic content in solid phase, large equipment investment, and energy consumption Large and other problems, to achieve the effect of strong extraction capacity, reduced investment, and reduced energy consumption

Active Publication Date: 2015-08-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology does not carry out deep dehydration treatment on the oily sludge before extraction. During the process, there is too much water in the oily sludge, the extraction is not thorough, and the organic content in the separated solid phase is high, and the material needs to be heated during the extraction process. , requires multi-stage extraction, long process flow, many equipment, large equipment investment, and large energy consumption
[0007] CN101633574A and CN101362979A propose a treatment method for oily sludge, which involves conditioning and filtering the oily sludge and mixing it with coal as fuel, but fails to recycle the oil in the oily sludge
However, the raw materials currently used as oily sludge extraction solvents mainly include light coal tar, petroleum ether, naphtha, light oil, benzene, toluene, methyl ethyl ketone and other industrial products or wide boiling range combination solvents. Extraction effect, but the oil content of the solid residue after extraction is still high. At the same time, if the sludge is dried at high temperature, more energy consumption is required (if the water content of the oily sludge is reduced from 80% to 40%, Each ton of sludge needs to evaporate 0.67 tons of water), and a certain amount of tail gas generated during the drying process also needs to be treated up to the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The solvent formula is as follows: distillate oil with a boiling range of 110-125°C is used as the main agent, accounting for 90% (v / v), and distillate oil with a boiling range of 140-150°C is used as an auxiliary agent, accounting for 7% (v / v). / v), distillate oil with a boiling range of 80-100°C, accounting for 3.0% (v / v), forming a composite extractant. Send the oily sludge with a water content of 90% and an oil content of 5% produced by a company into the greenhouse drying room, and place it under sufficient sunlight for 20 days, and use a mud turning machine to turn over the sludge every other day , and keep the drying room well-ventilated. Finally, the water content of the mud cake is 35%, and the oil content is 32%. Then take 1 kg of mud cake and mixed solvent at a mass ratio of 1:8 and mix and extract for 30 minutes. The extraction temperature is 30°C. After the extraction, the solid-liquid mixture is sent to the centrifugal separator, the separated liquid phase...

Embodiment 2

[0036] The solvent formula is as follows: distillate oil with a boiling range of 110-125°C is used as the main agent, accounting for 95% (v / v), and distillate oil with a boiling range of 140-150°C is used as an auxiliary agent, accounting for 4% (v / v), distillate oil with a boiling range of 80-100°C as an auxiliary agent, accounting for 1.0% (v / v), to form a composite extractant. Send the oily sludge with a moisture content of 85% and an oil content of 7% to the greenhouse drying room, and place it under sufficient sunlight for 15 days, turn over the sludge with a mud turning machine every other day, and keep it dry. The chemical room is well ventilated, and the water content of the final mud cake is 34.2%, and the oil content is 45.2%. Then take 1kg of mud cake and mixed solvent, and mix and extract at a mass ratio of 1:10 for 10 minutes at a temperature of 45°C. After the extraction is completed, The solid-liquid mixture is sent to the centrifugal separator, the separated l...

Embodiment 3

[0040] The solvent formula is as follows: distillate oil with a boiling range of 110-125°C is used as the main agent, accounting for 96% (v / v), and distillate oil with a boiling range of 140-150°C is used as an auxiliary agent, accounting for 3% (v / v), distillate oil with a boiling range of 80-100°C as an auxiliary agent, accounting for 1.0% (v / v), to form a composite extractant. That is, the oily sludge with a moisture content of 70% and an oil content of 10% is sent to the greenhouse drying room, and placed under sufficient sunlight for 20 days, and the sludge is turned over with a mud turning machine every 0.5 days, and kept dry. The chemical room is well ventilated, and the water content of the final mud cake is 15%, and the oil content is 47%. Then take 1kg of mud cake and mixed solvent, and mix and extract at a mass ratio of 1:10 for 30 minutes at a temperature of 45°C. After the extraction is completed, The solid-liquid mixture is sent to the centrifugal separator, the...

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Abstract

The invention relates to a treatment method of oil-containing sludge. The treatment method is especially suitable for the oil-containing sludge produced in sewage treatment processes of an oil refinery. The method includes feeding the oil-containing sludge to a greenhouse desiccation room, desiccating naturally under conditions of full sunshine, mixing mud cake with an extracting agent at room temperature, performing homogeneous extraction, feeding the material mixture to a solid-liquid centrifugal separator after the extraction is finished, and directly recycling separated liquid. Separated solid residue, after being dried, is mixed with coal and the mixture can be used as fuel for coal-fired boiler. According to the method, energy consumption for treatment of the oil-containing sludge is low, the technology process is short, the equipment investment is low and harmless treatment of the oil-containing sludge can be achieved.

Description

technical field [0001] The invention relates to a harmless treatment method for oily sludge, in particular to a treatment method in which the oily sludge produced by an oil refinery or an oil refinery sewage treatment plant is dried and extracted in a solar greenhouse, and the extracted product is directly smelted back. 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. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/12C10L5/46
CPCY02E50/30Y02W10/37Y02E50/10
Inventor 杨岳刘发强刘光利任立鹏贾媛媛周霞何琳张媛巫树锋李常青江岩王军
Owner PETROCHINA CO LTD
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