Continuous ultrasonic coupled critical water co-treating method and equipment for oily sludge/sewage

Abstract

The invention relates to a continuous ultrasonic coupled critical water co-treating method and equipment for oily sludge / sewage. The method comprises the following steps: 1), homogenization of oily sludge and sewage: the oily sludge and sewage are roughly filtered by a screen, injected into a homogenization tank, and homogenized by high-speed stirring; 2), ultrasonic coupled critical water oxidation treatment: a reactor ultrasonic transducer is started to conduct ultrasonic coupling critical water oxidation treatment on a mixture of the oily sludge and sewage; 3), emptying of reactor materials: a mixed material is pressed to a flash tank I or a flash tank II for separation of low-boiling-point substances under the action of a reactor I or a reactor II; 4), oil-water separation: the solid-liquid mixture separated by the flash tank I or the flash tank II is subjected to oil-water separation in an oil-water separation tank. The critical oxidation process can be realized without additionaloxidants, pyrolysis product gas can be stored in a storage tank, and the explosion limit issue does not need to be considered.

Description

technical field [0001] The invention relates to a treatment method and equipment for oily sludge, in particular to a method and equipment for co-processing oily sludge and oily sewage by using ultrasonically coupled critical water. Background technique [0002] A large amount of oily sludge and oily sewage are produced in the process of crude oil extraction, gathering, transportation, refining, etc., especially in oil fields that enter the high water cut period, the liquid production volume increases significantly, and the amount of oily sludge and oily sewage also increases. Oily sludge and oily sewage seriously pollute the environment, increasing the environmental protection and economic burden of oil companies. [0003] At present, the commonly used oily sludge treatment methods include solidification method, landfill method, incineration method and biological method. These technologies have certain shortcomings in terms of treatment effect, unit treatment cost and requi...

AI Technical Summary

Problems solved by technology

The State Intellectual Property Office authorization number CN 100480201C discloses a method for treating oily sludge using supercritical water oxidation technology, which realizes the harmless treatment of oily sludge, but because it uses a single tank reactor, it can only realize Batch operation, at the same time, it needs to add oxidant and a certain amount of water during the reaction process, which increases the complexity of operation and economic cost

The State Intellectual Property Office authorization number CN 103979757 B discloses a method for treating oily sludge using supercritical fluid multistage extraction-cracking coupling, which realizes the harmless treatment and resource reuse of oily sludge. The supercritical fluid extraction process was added before the supercritical oxidation treatment, and organic solvents such as supercritical propane, supercritical fluorine 134a, and supercritical n-pentane were used, which easily caused secondary pollution and lengthened the treatment process. A single kettle was used The type reactor can only realize batch operation, and also needs to add oxidant and a certain amount of water in the supercritical oxidation process, which is not conducive to the simplification and industrialization of the process

[0006] There are few related reports on the treatment of oily sewage by critical water oxidation technology. The Publication No. CN108455720 A of the State Intellectual Property Office discloses a supercritical hydrogen peroxide sewage treatment equipment, which realizes the secondary deep oxidation of oily sewage by connecting two critical water reactors in series. , but this treatment technology can only achieve harmless treatment of oily sewage, and additional oxidants need to be added, which increases operational complexity and economic costs

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