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Treatment method of oily sludge

A treatment method and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the use limitation, affect the coke volatile content and ash index, and affect the petroleum Coke quality and other problems, to achieve the effect of lightening the load, reducing the number of equipment and equipment construction investment, and reducing the number of times

Active Publication Date: 2011-05-11
PETROCHINA CO LTD
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  • 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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  • Treatment method of oily sludge
  • Treatment method of oily sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After mechanical dehydration, the oily sludge produced by a refinery sewage treatment plant has a moisture content of 74.3%, an oil content of 19.6%, and a solid content of 6.1%. The sludge is dried by a paddle-type sludge dryer (drying temperature 300°C, pressure 20kpa (absolute pressure)), and after drying for 85 minutes, the moisture content of the coke produced is 1.2%, which is mixed with butane at 1:95 Mix and extract for 30 minutes (at a temperature of 10°C). After the extraction is completed, the solid-liquid mixture is sent to the centrifugal separator, and the separated liquid phase enters the delayed coking device, and is heated to 340°C through heat exchange and the convection tube of the heating furnace, and enters the fractional distillation The lower part of the tower exchanges heat with the high-temperature gas from the top of the coke tower. After the light oil in the material is evaporated, the temperature of the material rises to 380°C, and at the same...

Embodiment 2

[0031] After mechanical dehydration, the oily sludge produced by a refinery sewage treatment plant has a water content of 79.5%, an oil content of 15.7%, and a solid content of 4.8%. After the sludge is dried (drying temperature 300°C, pressure 100kpa (absolute pressure), drying time 75min), the water content of coke is 58.5%, which is mixed with isooctane at 1:8 for extraction (temperature is 60 ℃, time 15min), after the extraction is completed, the solid-liquid mixture is sent to the centrifugal separator, and the liquid phase separated by centrifugation enters the delayed coking device, and is heated to 350 ℃ through heat exchange and heating furnace convection tube, and then enters the lower part of the fractionation tower, After exchanging heat with the high-temperature gas from the top of the coke tower, the light oil in the material is evaporated, and the temperature of the material rises to 400°C, and at the same time, the coke powder entrained in the high-temperature o...

Embodiment 3

[0035] After mechanical dehydration, the oily sludge produced by a refinery sewage treatment plant has a water content of 82.5wt%, an oil content of 15.7%, and a solid content of 4.8%. After the sludge is dried (drying temperature 160°C, pressure 40kpa (absolute pressure), time 60min), the water content of coke is 40.5%, which is mixed with diesel oil at a ratio of 1:20 (temperature is 20°C, time 10min ), after the extraction is finished, the solid-liquid mixture is sent to the centrifugal separator, and the separated liquid phase enters the delayed coking device, is heated to 346°C through heat exchange and the convection tube of the heating furnace, enters the lower part of the fractionation tower, and After the light oil in the material is evaporated, the temperature of the material rises to 395°C, and at the same time, the coke powder entrained in the high-temperature oil gas is washed. The raw material is drawn out from the bottom of the fractionating tower together with ...

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Abstract

The invention relates to a treatment method of oily sludge, which is particularly suitable for oily sludge generated during the sewage treatment process of a refinery plant. The method comprises the following steps: after centrifugal dewatering, the oily sludge is dehydrated through rotary dehydration equipment under the control of a certain negative pressure and a certain temperature, so as to destroy the water, oil and solid stable system in the oily sludge; parts of oil and water in the oily sludge are distilled out; the coke generated after dehydration is extracted with a solvent; after extraction, the material undergoes the solid-liquid separation; the separated liquid phase is delivered to a delayed coking device; the separated solid phase is dehydrated to form the residues that meet the discharge standards for solids; and the wastewater generated during the process is biochemically treated and then discharged after reaching the discharge standards. The invention is mainly characterized in that the sludge treatment process is short, the speeds and the efficiencies of sludge dehydration and extraction are high, the effect is good, the operational condition is moderate, the energy consumption is reduced, the oily sludge treatment effect is good, and the operating maintenance of the equipment is simple.

Description

technical field [0001] The invention relates to a method for treating oily sludge, in particular to a method for coking the oily sludge produced in oil refineries and refinery sewage treatment plants after 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 corresponding to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/12C10G1/00C10G9/00C10B55/00
Inventor 刘发强杨岳刘光利李常青江岩梁宝锋刘志花王军曹凤霞
Owner PETROCHINA CO LTD
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