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Oil-containing sludge disposal method

A treatment method and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve problems such as sedimentation blockage, damage to tower top equipment, and bumping, etc. To achieve the effect of reducing flow and power, reducing the area of ​​heat exchanger, and preventing the phenomenon of bumping

Active Publication Date: 2006-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also the following problems in the treatment of sludge entering the coking unit: first, limited by the coke ash content, the processing capacity is limited, and it is only suitable for the production of low-grade fuel coke; The quality of coke cannot be controlled; the third is that the sludge is heated unevenly, and the water is easy to gasify rapidly to cause bumping, which affects the operating temperature and pressure, and damages the tower top equipment
In this method, extraction, evaporation, and dehydration are carried out under reduced pressure, which not only requires vacuum equipment, but also has certain problems in the discharge of water and oil vapor condensate and the recovery of some light oil vapors; the operating temperature under reduced pressure evaporation conditions is low. , the material has high viscosity, poor mixing effect, difficult dehydration, and easy to cause clogging
In addition, the sludge and solvent oil are only mixed by mechanical stirring, so it is difficult to form a uniform mixture, which is prone to sedimentation and clogging, and it is difficult to completely remove the water in the sludge

Method used

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Experimental program
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Effect test

Embodiment 1

[0042] The flotation tank scum of a refinery contains a large amount of water. After dosing and centrifugal dehydration, the water content is 82.2wt%, the solid content is 3.5wt%, and the oil content is 14.3wt%. The sludge is mixed with the waste oil recovered from the sewage field (boiling point range is 150°C to 450°C) at a weight ratio of 1:2.5. The specific process flow is shown in Figure 1, and the specific operating conditions are shown in Table 1. After treatment, the final form powdery solid. The solid has good flammability and a calorific value of 3110 Cal / g. The COD in the extracted water is 180mg / L, and the oil is 32mg / L.

Embodiment 2

[0044] Compared with Example 1, the mixing method of solvent oil and sludge is mechanical stirring and preheating, without forced circulation; the calorific value of the obtained solid is 4325Cal / g. The COD in the extracted water is 160mg / L, and the oil is 41mg / L.

Embodiment 3

[0046] Compared with Example 1, the extraction evaporation system does not use forced circulation. The calorific value of the obtained solid was 3275 Cal / g. The COD in the extracted water is 210mg / L, and the oil is 55mg / L.

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Abstract

The invention discloses a treatment method for oil-containing sludge, which comprises: in extract dewater process, using multiple-effect or single-effect multiplestage extract evaporation system, wherein, in the latter, holding normal pressure in first stage and positive pressure in other stages; in the former, using normal pressure in all stages. Compared with prior art, this invention can decrease heat-exchange area and power consumption, and overcomes the problem from decompression operation in common multiple-effect multiplestage system.

Description

technical field [0001] The invention relates to a method for treating sludge, more specifically a method for treating sludge by combining extraction and evaporation dehydration, which is suitable for treating various sludges, especially oily sludge. Background technique [0002] In the process of petroleum processing, petroleum extraction and wastewater treatment, a large amount of oily sludge is usually produced, such as waste oil containing solids and emulsions, bottom sludge of oil storage tanks, bottom sludge of API grease traps, dissolved air flotation scum , residual activated sludge, and drilling waste fluid generated during oil extraction, oil-contaminated soil, etc. Taking an oil refinery with an annual processing capacity of 8 million tons of crude oil as an example, the amount of "three muds" (collectively referred to as grease trap bottom mud, scum, and excess activated sludge) produced by its sewage treatment plant is as high as 5,000 tons every year. These slu...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12
Inventor 赵景霞回军王有华韩建华
Owner CHINA PETROLEUM & CHEM CORP
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