RU30140U1 - Installation for water purification from emulsified oil and oil products - Google Patents

Description

Installation for water purification from emulsified oil and

The utility model relates to oil production,

oil refining and petrochemical industries, in particular to equipment designed for the treatment of wastewater containing oil or products of its processing, as well as to systems for waterflooding and maintaining reservoir pressure during the development of oil fields.

Known installations that use for the separation of an oil emulsion in water an active coalescing interface “water-gas” created by forced recirculation of the emulsion to be separated through drain cylinders - AOVPE (Water Purification Devices by Surface Effects) Patent No. 1404464. 06/23. 1988.

The physics of the process of separation of oil emulsions in water is based on the formation of a developed, continuously updated “water-gas” phase boundary, as a result of which oil droplets under the action of Vandervaals intermolecular forces transform into a film state on the water-gas interface. Then the films coalesce (enlargement) along their perimeter and the subsequent separation of the oil films during the passage of a water seal water trap.

The disadvantage of these AOVPE devices is the low value of the specific water-gas surface generated per unit volume of recirculated water, as a result of which the effect of cleaning water from emulsified oil is not high, and this design can only be effectively used to separate coarse emulsions of oil in water, replacing, for example slop equipment.

C02F 1/40

oil products

To increase separation efficiency,

an increase in the magnitude of the formed water-gas surface per unit volume of recycled water.

Closest to the proposed installation is a device for cleaning liquids from impurities - RF patent No. 1587003, 08.23.1990, made in the form of a film coalescentor. Installation for cleaning liquid includes a housing with separation elements installed in it, nodes for introducing the liquid to be cleaned and output of the separated phases. The dividing element is made in the form of a horizontal partition with the edges bent down. The device is equipped with a water seal installed on the bent edges of the partition, while the input unit of the liquid being cleaned is located above the partition in its center.

The operation of the installation involves repeated recirculation of the treated water, for which purpose a buffer tank and a pump are used as part of the installation. The installation is able to ensure almost 100% removal of water droplet oil and mechanical impurities moistened with oil, with sizes greater than 3 microns.

The disadvantage of the described installation is its significant dimensions (due to the horizontal arrangement of the separation elements) and high energy consumption, caused by the need to ensure a high rate of recirculation (up to 50 times) of the purified volume of water through the separation elements.

The objective of the utility model is to improve the quality of water treatment and reduce material costs.

The problem is solved by the installation for water purification from emulsified oil and oil products, including a hollow body with separation elements installed in it, an input unit for the cleaned liquid, and an output unit for separated phases. At the same time, the dividing elements are installed in an autonomous internal container and are made in the form of disks located vertically on a rotating horizontal shaft with the possibility of placing the lower halves of the disks immersed in

purified water, and the upper - in the gas phase of the housing, the disks have

a cellular structure in the form of holes made in the plane of the disk, and burn QHTOi / ibHbn the shaft on which the disks are mounted is installed with the possibility of separation

the interface of the water-gas internal capacity in half. The holes in the disk preferably have a diameter of 3-5 mm and are located at a distance of 2 mm from each other in a checkerboard pattern.

Unit design (Rotor-Disk-Coalescentor - RDK)

presented in FIG. 1.

1- input unit of the liquid being cleaned;

2- electric drive;

3- shaft bearings;

Iqpu2 oi TOi / ibHbui 4-Ш1л;

5-wheels;

6- internal capacity;

7-hollow body;

8- guide drain;

9 - anti-funnel device;

10-collector collector.

Rotary-disk coalescentor refers to devices that realize thin-film separation of the oil in water emulsion due to the formation of the active water-gas coalescing surface.

RDK works as follows. The liquid being cleaned through the input unit 1 enters the autonomous internal container 6 of the hollow body 7. When the separation elements in the form of disks 5 are semi-immersed in water, a certain volume of water is entrained by their surface in the gas phase region and an aqueous film forms on the surface of the disks. Drop oil, which is in close proximity to the interfacial interface “water-gas in water films on rotating disks, at a distance of“ 0.1 μm from the phase boundary, is affected by the Vandervaals forces, leading to the release of droplets from the film thickness and the transition of droplet contents oil to the water-gas boundary by spreading

On her. Thus, continuously formed

of the water-gas surface, there is a process of transition from the surface layer of water of oil droplets into films to the phase boundary and the coalescence of the films among themselves. Film oil together with a film of water is transferred by the disk 5 in the direction of its rotation and goes to the boundary of the water layer located behind the horizontal shaft 4, where it accumulates. The shaft 4, on which the disks 5 are located, divides the inner tank 6 along the upper boundary of the liquid in half. The rate of water-gas surface formation due to disk rotation is 5 higher than the oil spreading rate on the water-gas surface, therefore, the formed films can no longer re-enter the constantly formed water-gas surface and occupy it again. The flow of water along with the film oil flows down the drain guides 8 from the inner tank 6 of the housing 7, through an anti-funnel device 9 into the collection manifold 10 and then into the settling section, from where, through the output unit of the separated phases (not shown), respectively, water and oil are diverted autonomously. Coalescentor disks are specially processed - they have a cellular structure in the form of holes drilled in it 3-5 mm in diameter, arranged in a schahnom order, at a distance of 2 mm from each other (wetting centers) to ensure absolute wettability of the surface of the disks with water (including in the presence of Surfactant and oil).

An example of a specific implementation.

The process of thin-film oil recovery was carried out on “Devonian water — O. Gorkinsky and“ coal-bearing water — Suleevskaya TCU using the Rotor-Disk Coalescentor with the following parameters: Water consumption per 1 running cm of discharge perimeter - 4.0, RDK length - 100 cm , the rotor speed is 60 rpm, the number of discs is 120, the diameter of the discs is 250 mm.

to the coalescentor (Gorkinsky O.S.,). Emulsified distribution

oil in size at Suleevskaya TCU is finer - 80%, the total mass of emulsified oil is less than 5 microns.

The oil content in water, mg / l

123

Input216.2224.116.7

Exit 19.119.34.7

 - control - with the rotor off

Table 1

Gorknsky O.S.

45

14.416.2

3.414.7

The oil content in water, mg / l

123

Entrance 219.1266.6 331.4

Exit42.626.955.7

 - control - with the rotor off

As follows from the experimental results, the removal efficiency of the finely dispersed part of emulsified oil from the water is high. The specific surface area for the formation of the active water-gas coalescing surface for the proposed installation design is almost 9 times higher than when using the known design (RF patent No. 1587003), which allows the same energy consumption for water recirculation to achieve almost three times greater depth of treatment.

The technical and economic efficiency of the proposed installation consists of a reduction in the cost of water treatment, an increase in the overhaul period of injection wells, a decrease in the rate of clogging of oil-saturated blocks of the pore space of the reservoir, and an increase in the final oil recovery.

table 2

Suleevskaya TCU 45

286.9 315.7 46.3 289.7

Claims (2)

1. Installation for water purification from emulsified oil and oil products, including a hollow body with separation elements installed in it, a unit for inputting the liquid to be cleaned and a unit for outputting the separated phases, characterized in that the separation elements are installed in an autonomous internal container and are made in the form of disks located vertically on a horizontal shaft with the possibility of placing the lower halves of the disks immersed in the purified water, and the upper ones in the gas phase, while the disks have a mesh structure in the form of holes filled in the plane of the disk, and the horizontal shaft is installed with the possibility of separation of the interphase surface of the water-gas interface in the internal tank into two parts. 2. Installation according to claim 1, characterized in that the holes in the disk have a diameter of 3-5 mm and are located at a distance of not more than 2 mm from each other in a checkerboard pattern.