RU2593386C1 - Device for cleaning subsoil and soil from oil and oil products - Google Patents

Abstract

FIELD: ecology.

SUBSTANCE: invention relates to environmental protection and can be used for recultivation of oil and oil products contaminated subsoil and soil. Receiving container for mixing is equipped with a sludge pump-mixer and centrifugal sludge pump of the receiving container equipped with receiving basket for protection against major inclusions.

EFFECT: required technical result consisting in higher quality of cleaning, simplified operation process, decreased process fluid losses and increased mobility of equipment, is obtained in the device which comprises the receiving container for mixing coming contaminated subsoil and soil by heated water and producing liquefied mass, ejector-hydraulic mixer made to mix liquefied mass with hot water in turbulent conditions and equipped with inlet centrifugal sludge pump, outlet centrifugal sludge pump, hydraulic cyclone, which is configured to split the liquefied mass into solid and liquid phases, multifunctional container for separation of fluid into water and oil products, and vibratory sieve to withdraw fluid residues from solid phase and solid phase separation.

8 cl, 1 dwg

Description

The invention relates to the protection of the environment and can be used for the remediation of soils and soils contaminated with oil and oil products, neutralization of oil sludge, and elimination of the consequences of accidents and catastrophes.

A device for cleaning contaminated soil from oil products [RU 2027825 C1, C02F 1/40, B09C 1/02, 01/27/1995], including containers for contaminated and cleaned soils, a means for loading contaminated soil into a container, and the container for contaminated soil is made in the form of a hopper with a mixer for mixing soil located inside the tank for cleaned soil, both containers filled with hot water, and the means for loading contaminated soil into the tank is made in the form of a loading conveyor.

The disadvantage of this device is the relatively poor quality of cleaning.

A known method of cleaning oil-contaminated soils, soils and oil sludge (RF patent No. 224685, class C02F 1/40, publ. 20.01.2005), in which the soil (soil, sand) is washed with a washing liquid (3.0% aqueous solution of detergent with a temperature of 20-80 ° C, forming an unstable emulsion with hydrocarbon contaminants), the liquid is regenerated by phase separation with the separation of the organic phase and the return of the aqueous phase to the cleaning cycle. In this case, before washing, the soil (soil, sludge) is separated into a floating mass and the deposited soil (soil, sludge), and then only each separated fraction is washed. The process involves washing the floating mass by blasting on a vibrating screen by simultaneously separating the washed mass from the contaminating washing liquid. Washing the deposited soil (soil, sand) is carried out in three stages. At the first stage, washing is carried out during deposition in a stream of washing liquid with a volumetric ratio of the deposited soil (soil, sand) and liquid not less than 1: 1. At the second stage, sand is washed by an inclined screw conveyor when moving the material. In the third washing is carried out by blasting on a vibrating screen with the simultaneous separation of the washed soil (soil, sand) from the contaminated washing liquid.

The disadvantages of the method are the relatively low quality of washing, as well as the relatively high complexity of the technology and relatively low efficiency caused by the need to use a large amount of washing liquid.

A known line for cleaning oil-contaminated soils, soils and oil sludges [RU No. 224686, C02F 1/40, 01/20/2005], comprising a hopper, an inclined screw conveyor with an integrated jet washing system, hermetically connected to the bottom of the hopper, an overflow tank for oil and floating mass from the hopper, a vibrating screen for separating the floating mass from the contaminated washing liquid, a system for supplying the floating mass from the overflow tank to the vibrating screen in the form of a pipeline equipped with a pump, and the hopper is equipped with a loading grate and is equipped with at least one by setting the pressure mode with the possibility of directing the jet to any section of the hopper and net, the overflow capacity of oil and floating mass from the hopper is equipped with steam registers inside and has external insulation, the pipeline of the floating mass supply system to the vibrating screen is connected to the lower part of the overflow tank, the vibrating screen to separate the floating the mass has a drain system and is equipped with a jet washing installation located above the mesh surface of the vibrating screen, while the cleaning line contains a vibrating screen with a drain system for separation soil coming from the conveyor (sludge) from contaminated washing liquid, equipped with a jet washing installation located above the mesh surface of the vibrating screen, a settling tank with an internal partition for regenerating the washing liquid, equipped with steam registers inside, external insulation and a screw conveyor for removing precipitated solids, the system supply of washing liquid to the cleaning cycle, which includes a float intake device buried in a settling tank, a pump, a line of pipelines with wiring to hydrocyclone for additional purification of liquid from suspended particles.

The disadvantages of the method are the relatively low quality of washing, as well as the relatively high complexity of the technology and relatively low efficiency caused by the need to use a large amount of washing liquid.

The closest in technical essence to the proposed is the method and device according to the authors' patent for this application [RU 2381995 C1, C02F 1/40, B09C 1/02, 02/20/2010], containing a screen arranged in series for separating large inclusions, a mixer of contaminated material, a screen for separating medium inclusions and a funnel pan underneath it, a screw pump and a pipeline for supplying a liquefied mass to hoppers, two sand storage tanks, a tank with hot water, a slurry centrifugal pump for supplying heated water, an ejector-hydraulic mixture a mixer for mixing a liquefied mass with hot water, a hydrocyclone-sand separator and a hydrocyclone-desilter. At the first stage, the contaminated material is pre-prepared by removing large inclusions, mixing it with heated water and grinding the inclusions of wood and vegetation. At the second stage, the prepared contaminated material is intensively washed with heated water in a high-speed turbulent flow of a closed hydraulic strapping. At the third stage, the liquid and solid phases are separated by the hydrocyclone method and the liquid phase is separated into water and oil products, after which water is returned to the purification cycle.

The features of the closest technical solution is that it contains an ejector-hydraulic mixer, a distribution chute system for sending the washed material for shipment or for re-cleaning with the alternate filling of two storage bins located below the distribution chute system.

The disadvantage of the closest technical solution is the relatively high complexity, due to the need to use technical means for preliminary preparation, for example, a mechanical stirrer, which requires high energy costs and also increases the minimum loading height, which requires the operation of more complex loading equipment, and, in addition, relatively low efficiency due to the loss of liquid leaving the washed out solid phase from the sand and sludge separator.

The problem that is solved in the invention is to improve the quality of treatment.

The required technical result achieved by the implementation of the proposed invention is to improve the quality of cleaning while simplifying the operation process, reducing the loss of process fluid, increasing the mobility of the equipment as a whole.

The problem is solved, and the required technical result is achieved by the fact that in the device containing the receiving tank for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass, an ejector-hydraulic mixer, configured to mix the liquefied mass with hot water in a turbulent mode and equipped with inlet centrifugal slurry pump connected to the receiving tank by a pipeline for replenishing the liquid level, the output centrifugal slurry pump and connected with a receiving tank for stirring by the pipeline supplying the liquefied mass to the ejector-hydro mixer from the receiving tank for mixing, a hydrocyclone configured to separate the liquid mass into solid and liquid phases and connected by the pipeline supplying the liquefied mass from the outlet centrifugal slurry pump of the ejector-mixer to the hydrocyclone, and also a multifunctional tank for separating liquid into water and oil products connected to a hydrocyclone by a pipeline for supplying a liquid phase from a hydrocyclone in m According to the invention, a vibrating screen is configured to take fluid residues from the solid phase and to separate the solid phase and which is connected to the outlet of the hydrocyclone by a tray for supplying the solid phase from the hydrocyclone to a multifunctional tank with an inlet centrifugal pump and a water supply pipe from the multifunctional tank to the ejector-mixer. a vibrating screen and with an inlet pipe of a multifunctional capacity pipeline supplying the remaining liquid from the vibrating screen to the multifunctional tank, and the receiving mkost for stirring is provided with a slurry pump, agitator and a centrifugal slurry pump receptacle fitted with a receiving basket of large inclusions and the outlet is connected to the inlet pipe feeding the liquefied mass from the hydraulic mixer-ejector receptacle for mixing.

In addition, the required technical result is achieved by the fact that as the walls of the receiving tank can be used walls made in the soil of the pit, covered with a waterproof material.

In addition, the required technical result is achieved in that water with a temperature of 30-80 ° C is used as a technical fluid in the cycle.

In addition, the required technical result is achieved by the fact that chemical reagents can be added to the technical fluid.

In addition, the required technical result is achieved by the fact that the receiving basket for large inclusions can be made with 6 mm cells.

In addition, the required technical result is achieved by the fact that the pipeline for supplying a liquefied mass to the ejector-mixer from the receiving tank for mixing, the pipe for replenishing the liquid level, the pipe for feeding the liquid mass from the outlet centrifugal slurry pump of the ejector-mixer to the hydrocyclone, the pipeline for feeding the liquid phase from a hydrocyclone into a multifunctional tank, a pipeline for supplying water from a multifunctional tank to an ejector-mixer, a pipeline for supplying a solid phase from a hydrocyclone and in the vibrating screen and the pipeline for supplying residual liquid from the vibrating screen to the multifunctional tank, they can be equipped with valves.

In addition, the required technical result is achieved by the fact that the pipeline for supplying a liquefied mass to the ejector-mixer from the receiving tank for mixing, the pipe for replenishing the liquid level, the pipe for feeding the liquid mass from the outlet centrifugal slurry pump of the ejector-mixer to the hydrocyclone, the pipeline for feeding the liquid phase from a hydrocyclone into a multifunctional tank, a pipeline for supplying water from a multifunctional tank to an ejector-mixer, a pipeline for supplying a solid phase from a hydrocyclone and in the vibrating screen and the pipeline for supplying residual liquid from the vibrating screen to the multifunctional tank can be made flexible.

In addition, the required technical result is achieved in that the receiving tank for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass can have additional receiving sections with an identical design, the outlet pipes of which are connected to the pipeline for supplying the liquefied mass to the ejector-mixer from the receiving containers for stirring with corresponding pipelines equipped with valves.

In addition, the required technical result is achieved by the fact that the multifunctional tank has additional multifunctional tanks with an identical design, made with the possibility of autonomous or parallel operation.

In addition, the desired technical result is achieved in that the supply of a liquefied mass to the ejector-hydraulic mixer is carried out by forming a pressure below the atmospheric pressure in the ejector-hydraulic mixer.

In addition, the required technical result is achieved by the fact that the receiving tank for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass and a multifunctional tank for separating liquid into water and petroleum products are equipped with means for transporting with the multi-lift system.

In FIG. 1 shows an example of a functional diagram of a device for cleaning soil and soil from oil and oil products.

In the drawing are indicated:

1 - receiving tank for mixing incoming contaminated soil and soil with heated water and obtaining a liquefied mass;

2 - mixing pump of the receiving tank;

3 - centrifugal slurry pump of a receiving tank equipped with a receiving basket 4 for large inclusions;

5 - ejector-hydraulic mixer, made with the possibility of mixing the liquefied mass with hot water in a turbulent mode;

6 - pipeline supplying a liquefied mass to the ejector-hydraulic mixer from the receiving tank for stirring;

7 - multifunctional tank for separating liquid into water and petroleum products;

8 - inlet centrifugal slurry pump;

9 - pipeline for supplying water from a multifunctional tank to a centrifugal slurry pump; ejector-hydraulic mixer;

10 - pipeline for supplying water from a centrifugal slurry pump to the ejector-hydraulic mixer;

11 - output centrifugal slurry pump;

12 - pipeline for supplying water from the ejector-hydraulic mixer to the output centrifugal slurry pump;

13 - pipeline supplying a liquefied mass from the output of a centrifugal slurry pump into a hydrocyclone;

14 - hydrocyclone, configured to separate the liquefied mass into solid and liquid phases;

15 is a vibrating screen, configured to remove residual liquid from the solid phase and separating the solid phase and which is connected to the outlet of the hydrocyclone by a tray for supplying the solid phase from the hydrocyclone to the vibrating screen;

16 - a pipeline for supplying a liquid phase from a hydrocyclone to a multifunctional tank;

17 - pipeline supplying residual liquid from the vibrating screen to the multifunctional tank;

18 - fluid supply pipe (from a multifunctional tank to a receiving tank through an inlet centrifugal slurry pump).

A device for cleaning soils and soil from oil and oil products contains a receiving tank 1 for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass, an ejector-hydraulic mixer 5, configured to mix the liquefied mass with hot water in a turbulent mode, equipped with an input centrifugal slurry pump 8, the output centrifugal slurry pump 11 and connected to the receiving tank 1 pipe 6 for supplying a liquefied mass to the ejector-mixer from the receiving tank for stirring.

The receiving tank 1 for mixing is equipped with a slurry pump-mixer 2 and a centrifugal slurry pump of a receiving tank 3, equipped with a receiving basket 4 for large inclusions and an outlet pipe of which is connected to the inlet of the pipe 6 for supplying a liquefied mass to the ejector-mixer from the receiving tank for mixing.

The receiving tank 1 is connected by a pipe 18 to the inlet centrifugal slurry pump 8 to enable the possibility of replenishing the receiving tank 1 with water.

In addition, the device for cleaning soil and soil from oil and oil products contains a hydrocyclone 14, configured to separate the liquefied mass into solid and liquid phases and connected by a pipe 13 for supplying the liquefied mass from the outlet centrifugal slurry pump 11 to the hydrocyclone.

A device for cleaning soils and soils from oil and oil products also contains a multifunctional tank 7 for separating liquid into water and oil products, connected to a hydrocyclone 14 by a pipeline 16 for supplying a liquid phase from a hydrocyclone to a multifunctional tank and with an inlet centrifugal pump 8 by a pipeline for supplying water from a multifunctional tank to hydraulic ejector 5.

In addition to the above device for cleaning soils and soils from oil and oil products contains a vibrating screen 15, configured to select the remaining liquid from the solid phase and separating the solid phase and which is connected to the outlet pipe of the hydrocyclone 14 by a tray supplying the solid phase from the hydrocyclone 14 to the vibrating screen 15 and the inlet pipe of the multifunctional tank by the pipe 17 for supplying the remaining liquid from the vibrating screen to the multifunctional tank 7.

In addition, the proposed device for cleaning soils and soils from oil and oil products and its possible versions can have the following operational and design features.

In particular, I use water with a temperature of 30-80 ° C as heated water, the intake basket 4 for large inclusions is made with 6 mm cells. The size can be changed for specific cleaning conditions in the range from 4 to 20 mm. It is possible, in particular during accidents at oil pipelines, to use the walls of the pit made in the ground, covered with waterproof material, as the walls of the receiving tank.

In the proposed device, pipelines (a pipeline for supplying a liquefied mass to an ejector-hydraulic mixer from a receiving container for mixing, a pipeline for supplying a liquid, a pipeline for feeding a liquefied mass from an outlet centrifugal slurry pump of an ejector-mixer for a hydrocyclone, a pipeline for supplying a liquid phase from a hydrocyclone to a multi-function tank, a supply pipeline water from a multifunctional tank to an ejector-hydro mixer, a pipeline for supplying a solid phase from a hydrocyclone to a vibrating screen and a pipeline for supplying a skeleton Cove fluid from the shaker in the multifunction capacitance) can be equipped with valves including the remote control.

The same pipelines (a pipeline for supplying a liquefied mass to an ejector-hydraulic mixer from a receiving tank for mixing, a pipeline for supplying a liquid, a pipeline for feeding a liquefied mass from an outlet centrifugal slurry pump of an ejector-mixer for a hydrocyclone, a pipeline for supplying a liquid phase from a hydrocyclone to a multifunctional tank, a water supply pipeline from a multifunctional tank to an ejector-hydraulic mixer, a pipeline for supplying a solid phase from a hydrocyclone to a vibrating screen and a pipeline for supplying residual liquid from a vib ITPOs multifunctional capacity) can be made flexible.

To ensure continuous operation and increase productivity, the receiving tank 1 for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass may have additional receiving sections with an identical design, the outlet pipes of which are connected to the pipeline for supplying the liquefied mass to the ejector-hydraulic mixer 5 from the receiving tank 1 for stirring with their corresponding piping equipped with valves. Similarly, the multifunctional tank 7 may have additional multifunctional tanks with identical design, made with the possibility of autonomous or parallel operation.

The supply of a liquefied mass in the ejector-hydraulic mixer 5 can be done by forming a pressure below the atmospheric pressure in the ejector-hydraulic mixer 5. In addition, the receiving tank 1 for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass and the multifunctional tank 7 for separating liquid into water and oil products can be equipped with means for transporting with the multielevator system.

A device for cleaning soil and soil from oil and oil products as follows.

Contaminated soil, soil, oil sludge containing plant and other residues collected from the earth's surface during emergency oil spills can be used as an object of treatment.

At the stage of preliminary preparation, the material to be cleaned is loaded into a receiving tank 1 for mixing the incoming contaminated soil with water heated to 30-80 ° C by a centrifugal slurry pump 2. Large mechanical impurities that cannot be washed are washed from the outside by fluid flows and trapped in a receiving tank by a basket 4 for protection of subsequent equipment from large inclusions, which is equipped with a slurry pump 3, which delivers a diluted mass with inclusions of less than 6 mm in the ejector-hydraulic circuit using line 6 rer 5.

At the cleaning stage, at the same time as the liquefied mass is supplied by the slurry pump 3 to the ejector-hydraulic mixer 5, water from the multifunctional tank 7 is supplied by the inlet centrifugal slurry pump through the pipe 9 to the ejector-hydraulic mixer 5, where solid particles of the liquefied mass are washed off in a turbulent fluid flow.

From the ejector-hydraulic mixer 5, the liquefied mass is fed to the hydrocyclone 14, in which the process of separation of the liquid and solid phases occurs, using the outlet centrifugal slurry pump 11. The residual liquid phase is removed from the solid phase outgoing from the hydrocyclone 14 on the vibrating screen 15.

The separated liquid phase, mixed with petroleum products, enters through pipelines 16 and 17 into a multifunctional tank 7, where the separation of water from petroleum products. The resulting purified water is then returned to the treatment cycle, and oil products are shipped.

Thus, thanks to the introduced improvements (in particular, the introduction of a vibrating screen made with the possibility of removing residual liquid from the solid phase and separating the solid phase and which is connected to the outlet pipe of the hydrocyclone by a tray for supplying the solid phase from the hydrocyclone to the vibrating screen and to the inlet pipe of the multifunctional tank by a pipeline feeding the residual liquid from the vibrating screen into a multifunctional tank, and the receiving tank for stirring is equipped with a slurry pump-mixer and centrifugal sludge with a receiving pump of a receiving tank equipped with a receiving basket for large inclusions and an outlet pipe which is connected to the inlet of the liquefied mass supply pipe to the ejector-mixer from the receiving tank for mixing) the required technical result is achieved, which consists in improving the quality of the cleaning process while simplifying the operation process, reducing loss of process fluid, increasing the mobility of equipment in general.

Claims (8)

1. A device for cleaning soils and soil from oil and oil products, containing a receiving tank for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass, an ejector-hydraulic mixer made with the possibility of mixing the liquefied mass with hot water in a turbulent mode and equipped with an inlet centrifugal slurry pump connected to the receiving tank by a pipeline for replenishing the liquid level, the output centrifugal slurry pump and connected to the receiving tank for mixing the pipeline supplying the liquefied mass to the ejector-hydro mixer from the receiving tank for stirring, a hydrocyclone configured to separate the liquefied mass into solid and liquid phases and connected by the pipeline supplying the liquefied mass from the outlet centrifugal slurry pump of the ejector-mixer to the hydrocyclone, as well as a multi-function tank for separation of liquid into water and oil products connected to a hydrocyclone by a pipeline for supplying a liquid phase from a hydrocyclone to a multifunctional tank and with a direct-flow centrifugal pump with a pipeline for supplying water from a multifunctional tank to an ejector-hydraulic mixer, characterized in that a vibrating screen is introduced, configured to select residual liquid from the solid phase and separate the solid phase, which is connected to the outlet pipe of the hydrocyclone, a tray for supplying the solid phase from the hydrocyclone to the vibrating screen and with the inlet pipe of the multifunctional tank, the pipeline for supplying the remaining liquid from the vibrating screen to the multifunctional tank, and the receiving tank for stirring is equipped with and a slurry pump-mixer and a centrifugal slurry pump of a receiving tank equipped with a receiving basket for large inclusions, the outlet pipe of which is connected to the inlet of the liquefied mass supply pipe to the ejector-mixer from the receiving tank for mixing. 2. The device according to p. 1, characterized in that as the walls of the receiving tank used walls made in the soil of the pit, covered with a waterproof material. 3. The device according to p. 1, characterized in that as heated water use water with a temperature of 30-80 ° C. 4. The device according to claim 1, characterized in that the receiving basket for large inclusions is made with 6 mm cells. 5. The device according to p. 1, characterized in that the pipeline for supplying a liquefied mass to the ejector-hydraulic mixer from a receiving container for mixing, a pipeline for supplying a liquid, a pipeline for feeding a liquefied mass from an outlet centrifugal slurry pump of an ejector-mixer for a hydrocyclone, a pipeline for supplying a liquid phase from a hydrocyclone into a multifunctional tank, a pipeline for supplying water from a multifunctional tank to an ejector-hydro mixer, a pipeline for supplying a solid phase from a hydrocyclone to a vibrating screen and a pipeline for feeding the remainder The fluid flows from the vibrating screen to the multifunctional tank and are equipped with valves. 6. The device according to p. 1, characterized in that the pipeline for supplying a liquefied mass to the ejector-hydraulic mixer from a receiving container for mixing, a pipeline for supplying a liquid, a pipeline for feeding a liquefied mass from an outlet centrifugal slurry pump of an ejector-mixer in a hydrocyclone, a pipeline for supplying a liquid phase from a hydrocyclone into a multifunctional tank, a pipeline for supplying water from a multifunctional tank to an ejector-hydro mixer, a pipeline for supplying a solid phase from a hydrocyclone to a vibrating screen and a pipeline for feeding the remainder fluid flows from the vibrating screen to the multifunctional tank are flexible. 7. The device according to p. 1, characterized in that the receiving tank for mixing the incoming contaminated soil and soil with heated water and obtaining a liquefied mass has additional receiving sections with an identical design, the outlet pipes of which are connected to the pipeline for supplying the liquefied mass to the ejector-mixer from a receiving tank for stirring with corresponding pipelines equipped with valves. 8. The device according to p. 1, characterized in that the multifunctional tank has additional multifunctional tanks with an identical design, made with the possibility of autonomous or parallel operation.

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