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Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology

A technology for treating and refining sewage, which is applied in the direction of devices whose axial direction can be reversed, cyclone devices, separation methods, etc., and can solve the problems of high requirements for operation and maintenance, large floor space, and deterioration of separation.

Inactive Publication Date: 2009-08-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device is generally equipped with complex settings such as a booster pump, an air compressor, an ejector, a high-pressure dissolved air tank, and a release device. The entire device is bulky and has relatively high requirements for operation and maintenance.
[0006] Therefore, the conventional physical and chemical treatment process (primary treatment) has the following disadvantages: large floor area, high equipment investment, infrastructure and operation and maintenance costs, and long residence time of sewage, etc.
[0008] At the same time, cyclone separation also has disadvantages: due to the shearing effect generated by the flow of fluid in the cyclone, if the parameters are not designed properly, it is easy to break the liquid droplets (oil droplets or water droplets) and cause emulsification to deteriorate the separation process; Processing materials of different properties often requires cyclones of different structural sizes or operating conditions, so the versatility of cyclone separation operation is poor
The composition of various oils in oil refinery sewage is quite different due to the different processing objects of crude oil. It is of great practical significance to establish a treatment system with wider applicability to achieve efficient treatment of oil refinery sewage. The aerated hydrocyclone The industrial application of the device in oil refinery sewage treatment has not been reported yet.

Method used

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  • Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology
  • Method for treating oil refining sewage by employing multi-stage inflatable cyclonic current technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Process of using multi-stage aerated cyclone technology to treat oil refinery sewage

[0030] see figure 1 , the high-concentration oily sewage produced by each device in the refinery is firstly pressurized to 0.2-0.3MPa by the centrifugal pump 12 connected in series on the pipeline to the primary aerated hydrocyclone 2, and then added by demulsifier The medicine tank 1 is mixed with an appropriate amount of demulsifier, so that the pressurized sewage mixed with the demulsifier passes through the static mixer 16 (or Venturi mixer) and then remains in the pipeline for 15-25 seconds (depending on the content of emulsified oil and SS in the sewage) After that, it enters the first-stage inflatable hydrocyclone 2 for oil-water separation. The air source used for the cyclone separation operation can be provided by the compressed air or air compressor in the factory, and the petroleum oil in the sewage overflows from the upper part and flows back to the waste oil ta...

Embodiment 2

[0034] Example 2 Inflatable hydrocyclone

[0035] The primary and secondary aerated hydrocyclones 2 and 3 used in the flow process of embodiment 1 can be conventional aerated hydrocyclones, or can be such as figure 2 An aerated hydrocyclone (ASH) is described.

[0036] refer to figure 2 , the inflatable hydrocyclone is composed of three parts: feed section, flotation section and underflow section. The sections are connected by flanges. The shape of the entire cyclone device is cylindrical.

[0037] In the middle and upper part of the feeding section is the feeding pipe 21, from which the sewage enters the cyclone in a tangential feeding manner. An overflow pipe 22 and a gland 23 are designed on the top of the feed section. The outer side of the gland 23 is threaded with the top of the feed section, and the inner side is threaded with the overflow pipe 22, so that glands and overflow pipes with different inner diameters can be used according to water quality requirements, ...

Embodiment 3

[0041] According to the process and operation of Example 1 and Example 2, the field pilot test of using multi-stage aerated hydrocyclone technology to treat oil refinery sewage was first carried out in Liaohe Petrochemical Branch Company. The design processing capacity is 5t / h; the expected operation effect is achieved.

[0042] Liaohe Petrochemical Company mainly processes heavy oil and super heavy oil from Liaohe Oilfield, and the sewage to be treated has the typical characteristics of heavy oil sewage. The percentages of slick oil, dispersed oil, emulsified oil, and dissolved oil in raw water were 40.4%, 6.1%, 51.7%, and 1.6%, respectively. It can be seen that the oil contained in raw water is mainly slick oil and emulsified oil, and the degree of emulsification is relatively high, so the oily sewage to be treated in this embodiment belongs to the refractory oily sewage with high oil content, high emulsification, and high suspended solids.

[0043] The scope of main water ...

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Abstract

The invention provides a method for refinery waste water treatment by multi-stage air-sparged hydrocyclone technique, which can high effectively recycle floating oil, dispersed oil and emulsified oil of the refinery waste water, and eliminate most of suspension at the same time. The invention is mainly characterized in that: through setting at least two-stage air-sparged hydrocyclone, and combining the use of demulsifier, coagulant and coagulant aids, physiochemical treatment is carried out to high concentration oily waste water produced by all devices during the refinery process, and the releasing water after treatment can meet the biochemical stage water indices of normal waste water treatment field. The technique of the invention can substitute the physiochemical treatment stage (the first stage treatment) of the existing refinery waste water treatment process, and is characterized by high effect, occupying small land, and saving the investment, etc.

Description

technical field [0001] The invention relates to a method for treating oil refinery sewage by adopting multi-stage inflatable swirl technology, which belongs to the technical category of oil refinery sewage treatment. Background technique [0002] Oil refinery sewage treatment focuses on solving two problems: first, remove petroleum and suspended solids in sewage through physical and chemical methods (primary treatment); then consider removing COD, BOD, and NH in water through biochemical methods 3 -N and other organic pollutants. [0003] Oil in refinery sewage generally exists in four forms: slick oil, dispersed oil, emulsified oil, and dissolved oil: (1) slick oil, which spreads on the surface of sewage to form an oil film or oil layer, and the particle size of oil droplets is relatively large, generally greater than 100 μm , accounting for more than 70% to 80% of the total oil content; (2) dispersed oil, dispersed in the sewage in the form of oil particles, unstable, oft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B04C5/00C02F1/40C02F1/38C02F1/52
Inventor 阎光绪陈春茂王嘉麟彭鸽威李敏杨双春郭绍辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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