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Oil-containing sludge treating method

A treatment method and sludge technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems affecting the volatile and ash index of coke, complex evaporation system, large power consumption, etc., achieve remarkable treatment effect and simple process , low operating costs

Inactive Publication Date: 2004-04-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent the coking effect of the water in the sludge, a multi-stage evaporation system (4 stages in the manual) from reduced pressure (50-250mmHg) to normal pressure is used to remove water, and the dehydrated sludge is sent to the top of the coking tower or the coking tower At the bottom, after high temperature treatment, the lighter components are converted into coking distillates, and the heavy components are converted into coke, and the solids in the sludge are attached to the coke. Therefore, the problem with this technology is that the introduction of solids affects the volatile content of coke. and gray index
Especially for producers of high-quality petroleum coke, the use of this technology is limited
In addition, the evaporation system for removing moisture is complicated and requires special evaporation equipment, which has high equipment cost, high power consumption, and difficult operation

Method used

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Effect test

Embodiment 1

[0015] Take 10L of grease trap bottom sludge (81.2% water content, 5.5% solid content, 13.3% oil content) after mechanical dehydration in a refinery, and 30L kerosene at normal pressure, send it into the sludge mixing tank and heat it to 75 °C, use a pump to send the mixed material into the thermal extraction tower for dehydration for continuous operation. The extraction-dehydration operating conditions are: normal pressure, 105 °C, and the residence time is 40 minutes. The COD was 140mg / l and the oil in water was 17mg / l by removing water and sending sample analysis. The calorific value of the separated solid is 8120cal / g, which is higher than that of general standard coal, and neither the solid nor the oil phase contains water.

Embodiment 2

[0017] After centrifugal dehydration, the scum of a refinery contains 10.3% oil and 84.3% water. Take 4L of scum and 10L of Saudi regular first-line distillate oil as solvent oil, heat and mix in the mixing tank, and send it to extraction when the temperature reaches 100°C / Dehydration tower for continuous extraction / dehydration treatment, dehydration extraction at normal pressure 110°C, residence time is 25 minutes, water and some light component oil are condensed from the top of the tower through the condenser and enter the oil-water separation tank, water samples are taken from the bottom The analytical oil is 24mg / l, and the COD is 310mg / l, which meets the biochemical influent requirements of the sewage field and can be directly sent to the biological oxidation facility for further treatment. The organic components and solids in solvent oil and sludge enter the solid-liquid separator. Due to the removal of water and the extraction of the oil phase, the solids are easily sep...

Embodiment 3

[0019] The mixture of bottom sludge, scum and remaining activated sludge in a grease trap in a refinery contains 13.3% oil and 80.3% water after plate and frame pressure filtration. Take 4L of scum and 25L of coking wax oil, and heat and mix them in a mixing tank , when the temperature reaches 100°C, it is sent to the extraction / dehydration tower for continuous processing, dehydration extraction is carried out at 125°C under normal pressure, the residence time is 15 minutes, water and part of the light component oil are condensed from the top of the tower into the oil water In the separation tank, water samples were taken from the bottom to analyze that the oil was 19mg / l and the COD was 221mg / l, which met the biochemical water inflow requirements of the sewage field and could be directly sent to the biological oxidation facility for further treatment. The organic components and solids in solvent oil and sludge enter the solid-liquid separator. Due to the removal of water and t...

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Abstract

The invention discloses a treatment method for oily mud. The invention carries on mechanical dehydration to oily mud, then blends with extracted solvent oil and preheats them, then carries on heat extraction and dehydration, carries on solid-liquid separation, the liquid phase enters the coking device, the solid phase can be used as fuel. The gas phase is carried on oil and water separation, the water can be discharged into the waste water treatment field; oil is carried on further treatment. The method is simple and easy to be operated.

Description

1. Technical field [0001] The invention relates to a method for treating oily sludge, in particular to a method for reducing volatile matter and ash of coke when the oily sludge produced in refineries, oilfield sewage treatment plants and tank farms is subjected to coking treatment. 2. Background technology [0002] In the process of oily wastewater treatment, a large amount of oily sludge is produced, such as API grease trap bottom sludge, dissolved air flotation scum, electro-desalted waste oil, oil tank bottom sludge and residual activated sludge, etc. Due to the different processes of oily sludge production, the oil and water content are quite different. Among them, "oil" is composed of many different types of organic compounds, most of which are toxic, harmful and difficult to biodegrade; solid particles are classified as extremely small particles Distributed in sludge, the mixture of oil-water-solid is often in an emulsified state. Conventional demulsification techniqu...

Claims

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Application Information

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IPC IPC(8): C02F11/12
Inventor 赵景霞回军王有华杨丽
Owner CHINA PETROLEUM & CHEM CORP
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