CN115487698A - High-pressure vortex high-efficiency separation method for pollutants in soil - Google Patents

Abstract

A high-pressure eddy current high-efficiency separation method for pollutants in soil, comprising the following steps: high-pressure conveying separation liquid; further increasing the flow rate of the conveyed separation liquid, and simultaneously dividing it into left and right strands; forming a turbulent flow between the two strands of separation liquid and the soil to be separated Mixing; rotating and rubbing the mixture of separation liquid and soil forming a turbulent flow to achieve further mixing; reducing the flow velocity and impact force of the further mixed separation liquid and soil mixture; reducing the flow velocity and impact force of the separation liquid and The soil mixture forms secondary turbulent mixing, while its flow velocity and impact force are further reduced; the final separation liquid and soil mixture are collected and separated into solid and liquid. The high-pressure eddy current high-efficiency separation method of pollutants in soil realizes efficient and rapid separation of polluted soil, significantly improves the separation efficiency of pollutants and soil particles, solves the problems of uneven mixing and low efficiency of current technologies, and has a good application prospect.

Description

A high-pressure eddy current high-efficiency separation method for pollutants in soil

technical field

The invention relates to the technical field of soil remediation, in particular to a high-pressure eddy current high-efficiency separation method for pollutants in soil.

Background technique

Among the commonly used technologies for site remediation at home and abroad, the migration of pollutants from the soil phase to the water phase is realized by stirring and mixing the separation liquid and the soil, and then solid-liquid separation is used to remove pollutants, which is a common repair method. This technology realizes the removal of different types of pollutants such as organic matter and heavy metals by configuring separation fluids of different properties, and can significantly reduce the content of soil pollutants.

Among them, the ectopic separation process has good effect and high reliability compared with other repair methods, and has received extensive attention in recent years. The effect of the ex-situ separation process is closely related to the mixing of the soil and the separation liquid. The existing mainstream mixing and stirring devices usually adopt processes such as soil block crushing, particle screening, vibration mixing, drum mixing, spiral stirring, and multi-stage treatment to achieve separation. Thorough mixing of liquid and soil. However, these processes still have certain shortcomings such as uneven mixing, low efficiency, and large floor space.

At present, there are few introductions about the high-pressure eddy current high-efficiency separation process. The related technology mainly improves the mixing efficiency by increasing the pressure of the separation liquid, but there is a lack of related technology for the performance of the pipeline structure. Therefore, it is still necessary to improve the performance of the pipeline structure and separation efficiency. Shower structure scheme.

Contents of the invention

The present invention is made to solve the above problems, and aims to provide a high-pressure eddy current high-efficiency separation method for pollutants in soil.

The invention provides a high-pressure eddy current high-efficiency separation method for pollutants in soil, which has the following steps: transporting the separation liquid at high pressure; further increasing the flow rate of the transported separation liquid, and simultaneously dividing it into left and right strands; making the two strands The separation liquid and the soil to be separated form a turbulent mixing; the mixture of the separation liquid and the soil that forms a turbulent mixing is rotated and rubbed to achieve further mixing; the flow velocity and impact force of the further mixed separation liquid and soil mixture are reduced; The mixture of separation liquid and soil with reduced flow velocity and impact force forms secondary turbulent mixing, while its flow velocity and impact force are further reduced; the final mixture of separation liquid and soil is collected and solid-liquid separated.

In the high-pressure eddy current high-efficiency separation method for pollutants in soil provided by the present invention, it can also have such a feature: the method uses a high-pressure eddy current high-efficiency separation device for pollutants in soil to mix the separation liquid and soil, and the high-pressure eddy current high-efficiency separation of pollutants in soil The separation device includes a shrinking tube, a first mixing chamber, a high-pressure mixing tube, an expanding tube, and a second mixing chamber connected in sequence. The beginning of the shrinking tube is the inlet of the separation liquid, and the bottom of the shrinking tube is provided with a split flow lifting surface, which is used for The separation liquid flowing through is divided into left and right two streams, and they are lifted simultaneously. The top of the first mixing chamber is provided with a soil material inlet. The rotating blade is used to rotate, rub and mix the mixture of separation liquid and soil flowing through; the bottom of the end of the expansion pipe is provided with a soil material outlet, and the rear inner wall of the second mixing chamber is in the shape of a circular arc that facilitates the formation of turbulent flow .

Further, the diversion lifting surface includes a first smooth curved surface and a second smooth curved surface, the first smooth curved surface and the second smooth curved surface are distributed left and right in the shrink tube, and the distance from the bottom side inner wall of the shrink tube gradually increases along the direction from the beginning to the end big.

Further, there are multiple rotating blades, and the high-pressure mixing tube is provided with multiple sets of rotating blade sets distributed along the axial direction, and each set of rotating blade sets includes at least two rotating blades distributed along the circumferential direction of the high-pressure mixing tube.

Further, the earth material inlet is in the shape of a tube arranged vertically.

Further, the earth material outlet is in the shape of a tube arranged vertically.

Further, a flow meter is provided at the inlet of the separating liquid.

Further, a pressure gauge is provided in the middle of the high-pressure mixing tube.

Further, the medium pressure in the first mixing chamber and the high-pressure mixing tube is 80-150 MPa.

In the high-pressure eddy current high-efficiency separation method for pollutants in soil provided by the present invention, it may also have such a feature: the soil to be separated is crushed and screened in advance.

Function and Effect of Invention

According to the high-pressure eddy current high-efficiency separation method for pollutants in soil involved in the present invention, because the separation liquid is transported at high pressure, in the process of washing the soil, the high-pressure separation liquid is firstly further increased in speed and divided, and then mixed with the soil to be separated in a turbulent flow , and then the mixture of the separation liquid and the soil is rotated and rubbed to achieve further mixing, then the impact pressure is reduced, and then the second turbulent mixing and speed reduction are performed, and finally the solid-liquid separation is collected and the contaminated soil is realized. , Quick separation. Therefore, this method significantly improves the separation efficiency of pollutants and soil particles, solves the problems of uneven mixing and low efficiency of the current technology, and has a good application prospect.

Description of drawings

1 is a schematic diagram of the steps of the high-pressure eddy current high-efficiency separation method for pollutants in the soil in an embodiment of the present invention;

Fig. 2 is a side view sectional view of a high-pressure eddy current high-efficiency separation device for pollutants in soil in an embodiment of the present invention;

Fig. 3 is a top view sectional view of a high-pressure eddy current high-efficiency separation device for pollutants in soil in an embodiment of the present invention;

Fig. 4 is a schematic structural view of the rotating blades in the high-pressure mixing tube in the embodiment of the present invention.

Explanation of reference signs:

100 High-pressure eddy current high-efficiency separation device for pollutants in soil; 10 Shrink tube; 11 Separation liquid inlet; Mixing pipe; 31 rotating blade; 40 expansion pipe; 41 soil material outlet; 50 second mixing chamber; 60 flow meter; 70 pressure gauge.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the following embodiments are combined with the accompanying drawings to illustrate the present invention in detail.

Example

Figure 1 is a schematic diagram of the steps of the high-pressure eddy current high-efficiency separation method for pollutants in soil.

As shown in Figure 1, this embodiment provides a high-pressure eddy current high-efficiency separation method for pollutants in soil, including the following steps: high-pressure conveying the separation liquid; further increasing the flow rate of the conveyed separation liquid, and simultaneously dividing it into two streams; The two separation liquids and the soil to be separated form a turbulent mixing; the mixture of the separation liquid and the soil that forms a turbulent mixing is rotated and rubbed to achieve further mixing; the flow velocity and impact force of the further mixed separation liquid and soil mixture are reduced ; Make the mixture of separation liquid and soil with reduced flow velocity and impact force form secondary turbulent mixing, while its flow velocity and impact force are further reduced; collect the final mixture of separation liquid and soil, and separate it from solid to liquid.

Among them, the sufficient mixing of the separation liquid and the soil is realized by a high-pressure eddy current high-efficiency separation device for pollutants in the soil, and the device will be described in detail below.

Fig. 2 is a side sectional view of the high-pressure eddy current high-efficiency separation device 100 for pollutants in soil, and Fig. 3 is a top sectional view of the high-pressure eddy current high-efficiency separation device 100 for pollutants in soil.

As shown in Figures 2 and 3, the high-pressure vortex high-efficiency separation device 100 for pollutants in soil mainly includes a shrinking tube 10, a first mixing chamber 20, a high-pressure mixing tube 30, an expanding tube 40, and a second mixing chamber 50 connected in sequence. .

The starting end (or large-diameter end) of the shrink tube 10 is the separation liquid inlet 11 for the high-pressure separation liquid to enter, and the end (or small-diameter end) of the shrink tube 10 is connected to the first mixing chamber 20, and the shrink tube 10 gradually passes through the pipe diameter. Smaller increases the flow rate of the separation liquid passing through it. The bottom of the shrink tube 10 is provided with a split flow lifting surface 12, and the split flow lifting surface 12 includes a first smooth curved surface 121 and a second smooth curved surface 122, and the first smooth curved surface 121 and the second smooth curved surface 122 are distributed left and right in the shrink tube 10, and The distance from it to the inner wall of the bottom side of the shrink tube 10 gradually increases along the direction from the beginning to the end, so that the separation liquid flowing through the splitter lifting surface 12 can be divided into left and right two streams, and at the same time, it can be lifted steadily to further increase the flow rate.

The top of the first mixing chamber 20 is provided with an earth material inlet 21 for soil to enter, and the earth material inlet 21 is in the shape of a tube arranged vertically so that the soil falls into the first mixing chamber 20 under the action of gravity. The first mixing chamber 20 adopts a circular chamber design. Specifically, the inner walls on the left and right sides of the first mixing chamber 20 are arc-shaped, and are used to divert the two separation liquids that have been diverted and raised by the diverting and lifting surface 12, so that A turbulent flow is created in the first mixing chamber 20 . As shown in Figure 3, when two strands of separation liquids entered the first mixing chamber 20, and soil fell into the first mixing chamber 20 from the soil material inlet 21, the two strands of separation liquids were under the guide flow of the first mixing chamber 20 inner walls. Converging and colliding and falling under the action of gravity, at the same time, it forms a violent collision with the soil to achieve strong mixing, crushing and separation. Part of the mixture will flow into the high-pressure mixing tube 30, and the other part of the mixture will be in turbulent flow in the first mixing chamber 20 Flow, so that the separation liquid and soil are fully mixed and the contaminants are efficiently transferred to the separation liquid.

The high-pressure mixing pipe 30 is used for the mixture of the separated liquid and the soil to flow and wash inside, and the "flow flushing" here means that the separated liquid and the soil are fully mixed and collided. The high-pressure mixing tube 30 is provided with multiple groups of rotating blades 31 distributed along the axial direction, and each group of rotating blades 31 includes a plurality of rotating blades 31 distributed along the circumference of the high-pressure mixing tube 30 . As shown in FIG. 4 , the structural schematic view of the rotating blade 31 is in the shape of an arc. The arrangement of the rotating blades 31 causes the passing separation liquid and soil to rub and rotate in the high-pressure mixing pipe 30 to form a turbulent flow and realize further mixing and separation.

The beginning (or small-diameter end) of the expansion tube 40 is connected to the end of the high-pressure mixing tube 30, and the end (or large-diameter end) of the expansion tube 40 is connected to the second mixing chamber 50. The flow velocity of the mixture of the separation liquid and the soil through the expansion pipe 40 is reduced to reduce the impact force and further mix the separation liquid and the soil at the same time. The end bottom of the expansion tube 40 is provided with an earth material outlet 41, and the earth material outlet 41 is in the shape of a tube arranged vertically for the mixture in the expansion tube 40 and the mixture returned from the second mixing chamber 50 to flow out under the action of gravity.

The second mixing chamber 50 allows the mixture of the separation liquid and the soil to collide with the inner wall to form secondary turbulent mixing, and reduce the flow velocity and impact force at the same time to facilitate subsequent discharge. The second mixing chamber 50 adopts a semi-circular chamber design. Specifically, the rear inner wall of the second mixing chamber 50 is arc-shaped, which is used to guide the mixture of the separation liquid and the soil, so that it forms a turbulent flow through collision and backflow. , to realize the secondary mixing of separation liquid and soil.

When the high-pressure eddy current high-efficiency separation device for pollutants in soil is in use, the soil to be separated first falls from the soil material inlet 21 into the first mixing chamber 20 for a mixing operation, and the separation liquid turbulent flow formed by the split flow lifting surface 12 is used to realize mixing and separation. Then enter the high-pressure mixing tube 30, realize further mixing and separation by means of the rotating blades 31 in the high-pressure mixing tube 30, then enter the expansion tube 40 to slow down the flow velocity, reduce the impact force, and then enter the second mixing chamber 50 for collision and impact again to realize Secondary mixing and speed reduction are finally collected from the soil material outlet 41. The separation liquid first enters from the separation liquid inlet 11, passes through the shrink tube 10 and the split flow lifting surface 12 to realize further speed-up and split flow, which increases the impact force and mixing degree of the separation process, and then enters the first mixing chamber 20 and the high-pressure mixing tube 30, Mix and flow with the soil, and finally collect from the soil material outlet 41 as well.

Among them, the soil added from the soil material inlet 21 needs to be crushed and screened in advance, and should not contain larger particle soil clods and stones, otherwise the diversion lifting surface 12, the first mixing chamber 20, the high-pressure mixing pipe 30, and the expansion pipe will be damaged. 40, and a second mixing chamber 50. Therefore, in actual implementation, a crushing device, a screening device, and a conveying device need to be installed before the soil material inlet 21 to cooperate with the high-pressure eddy current high-efficiency separation device for pollutants in the soil.

The separation liquid entering from the separation liquid inlet 11 is transported by a high-pressure pump, and the delivery pressure depends on the actual equipment conditions. The recommended pressure is between 80 and 150 MPa, which can achieve a relatively good separation effect. Further, a flow meter 60 is provided at the separation liquid inlet 11, and the setting of the flow meter 60 can measure the separation liquid entering the high-pressure mixing pipe 30, thereby facilitating monitoring and adjustment. Adjust the pressure appropriately. The middle part of the high-pressure mixing tube 30 is provided with a pressure gauge 70. The setting of the pressure gauge 70 can measure the pressure of the mixture in the high-pressure mixing tube 30, thereby facilitating monitoring and adjustment. The pressure of the mixture in the high-pressure mixing tube 30 detected by the pressure gauge 70 is It is preferably 80-150 MPa.

It should be noted that the high-pressure eddy current high-efficiency separation device 100 for pollutants in soil shown in this embodiment is not provided with relevant pipe section valves. During specific implementation, flow control valves and the like should be provided according to actual operation needs.

What is collected from the soil material outlet 41 is the mixture of the separation liquid and the soil, which should go through a solid-liquid separation process in the follow-up, and finally the separated separation liquid is recovered and recycled, and the separated soil has completed the removal of pollutants.

In addition, the high-pressure eddy current high-efficiency separation device 100 for pollutants in soil can be connected in series in multiple stages to further improve the separation effect, and can also be used in parallel to increase the soil treatment capacity.

Function and effect of embodiment

According to the high-pressure eddy current high-efficiency separation method for pollutants in soil involved in this embodiment, because the separation liquid is transported at high pressure, in the process of washing the soil, the high-pressure separation liquid is first further accelerated and divided, and then undergoes a turbulent flow with the soil to be separated Mixing, and then the mixture of separation liquid and soil is rotated and rubbed to achieve further mixing, and then the impact pressure is reduced, followed by secondary turbulent mixing and speed reduction, and finally collected and separated for solid-liquid separation, which realizes the pollution of soil. Efficient and fast separation. Therefore, this method significantly improves the separation efficiency of pollutants and soil particles, solves the problems of uneven mixing and low efficiency of the current technology, and has a good application prospect

Among them, the mixing of the separation liquid and the soil is realized by a high-pressure eddy current high-efficiency separation device for pollutants in the soil. The device includes a constriction tube, a first mixing chamber, a high-pressure mixing tube, an expansion tube, and a second mixing chamber connected in sequence. There is a diversion lifting surface inside the shrinking tube, the first mixing chamber is designed with a circular arc-shaped inner wall on both sides, and the top is equipped with a soil material inlet, the high-pressure mixing tube is equipped with rotating blades, and the bottom of the expansion tube is equipped with soil materials. The outlet and the second mixing chamber adopt a chamber design with a rear inner wall in a circular arc shape. When the soil to be separated enters the first mixing chamber, the soil and the separation liquid formed by the split flow lifting surface form a turbulent mixing in the first mixing chamber, and then enter the high-pressure mixing tube, and realize further mixing and separation through the internal rotating blades, and then It enters the expansion tube to reduce the impact pressure, and then enters the second mixing chamber for another collision and impact to achieve secondary turbulent mixing and speed reduction, and finally collects from the soil outlet at the end of the expansion tube. The device adopts high-pressure flushing and special configuration design, which significantly improves the separation efficiency of pollutants and soil particles, solves the shortcomings of current technology such as uneven mixing, low efficiency, and large footprint, and also reduces costs.

Furthermore, the pressure in the first mixing chamber and the high-pressure mixing tube should be 80-150Mpa, which can not only ensure that the separation liquid is fully mixed with the soil, but also avoid damage to the rotating blades in the high-pressure mixing tube caused by excessive impact force.

Furthermore, the two-stage mixing chamber design is adopted, which significantly improves the separation effect of pollutants and soil particles. Among them, the first mixing chamber adopts the split flow mixing mode. The high-pressure separation liquid passes through the split lifting surface to form two high-speed separation liquid flows, which collide in the first mixing chamber to form a turbulent flow, and form a violent collision with the added soil to achieve strong mixing. , broken and separated. The second mixing chamber adopts the collision mixing mode, and the shower mixture forms a turbulent flow through collision and backflow, realizing the secondary mixing of the separation liquid and the soil.

Further, the rotating blades can be distributed into multiple groups axially in the high-pressure mixing tube, and the rotating blades of each group can be distributed along the circumferential direction of the high-pressure mixing tube. The rotating blades can make the high-pressure separation liquid and soil rub and rotate in the high-pressure mixing tube to form turbulent flow and achieve full mixing. It makes full use of the pressure and velocity inside the pipe, realizes the simultaneous mixing of high-pressure jet and straight pipe, greatly increases the separation efficiency, and reduces the equipment footprint and cost.

Furthermore, the expansion tube and the second mixing chamber can effectively reduce the terminal pressure, and increase the service life of the high-pressure eddy current high-efficiency separation device for pollutants in the soil. Among them, the expansion tube realizes the deceleration of the high-pressure and high-speed shower mixture through the increase of the tube diameter, which effectively reduces the impact on the end of the tube. The second mixing chamber significantly reduces the impact of the separation liquid on the pipeline through the arc-shaped rear inner wall.

Further, a flow meter is provided at the inlet of the separation liquid, and the flow meter can measure the separation liquid entering the high-pressure mixing tube. A pressure gauge is arranged in the middle of the high-pressure mixing tube, and the pressure gauge can measure the pressure of the mixture in the high-pressure mixing tube. By setting the flow meter and pressure gauge, it is convenient to monitor and adjust the flow and pressure of the medium in the device.

Further, the soil to be separated is crushed and screened in advance, which can avoid damage to the pipeline, the chamber, and the internal structure.

The above embodiments are preferred examples of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (10)

1. A high-pressure eddy current high-efficiency separation method for pollutants in soil is characterized in that, comprising the following steps: High pressure conveying separation liquid; Further increase the flow rate of the separated liquid to be transported, and divide it into left and right two streams at the same time; Make the two separation liquids form a turbulent mixing with the soil to be separated; Rotate and rub the mixture of separation liquid and soil that forms a turbulent flow to achieve further mixing; Reduce the flow velocity and impact force of the further mixed separation liquid and soil mixture; The mixture of separation liquid and soil with reduced flow velocity and impact force forms secondary turbulent mixing, while its flow velocity and impact force are further reduced; The final mixture of separated liquid and soil is collected and separated into solid and liquid. 2. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 1, characterized in that: Wherein, the high-pressure eddy current high-efficiency separation method for pollutants in soil uses a high-pressure eddy current high-efficiency separation device for pollutants in soil to mix the separation liquid and soil, The high-pressure eddy current high-efficiency separation device for pollutants in the soil includes a shrinking tube, a first mixing chamber, a high-pressure mixing tube, an expanding tube, and a second mixing chamber connected in sequence. The bottom of the bottom is provided with a diversion lifting surface, which is used to divide the separating liquid flowing through into left and right two streams and lift them up simultaneously. The top of the first mixing chamber is provided with a soil material inlet, and the first mixing chamber The inner walls on both sides of the left and right sides are arc-shaped to facilitate the formation of turbulence, and the high-pressure mixing tube is provided with rotating blades, which are used to rotate, rub and mix the mixture of separation liquid and soil flowing through; the expansion tube The bottom of the end is provided with a soil material outlet, and the rear inner wall of the second mixing chamber is arc-shaped to facilitate the formation of turbulent flow. 3. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 2, characterized in that: Wherein, the diversion lifting surface includes a first smooth curved surface and a second smooth curved surface, The first smooth curved surface and the second smooth curved surface are distributed left and right in the shrink tube, and the distance between them and the bottom inner wall of the shrink tube gradually increases along the direction from the beginning to the end. 4. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 2, characterized in that: Wherein, there are multiple rotating blades, The high-pressure mixing tube is provided with a plurality of sets of rotating blades distributed along the axial direction, and each set of rotating blades includes at least two rotating blades distributed along the circumference of the high-pressure mixing tube. 5. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 2, characterized in that: Wherein, the soil material inlet is in the shape of a tube arranged vertically. 6. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 2, characterized in that: Wherein, the soil material outlet is in the shape of a tube arranged vertically. 7. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 2, characterized in that: Wherein, a flow meter is provided at the inlet of the separating liquid. 8. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 2, characterized in that: Wherein, the middle part of the high-pressure mixing tube is provided with a pressure gauge. 9. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to claim 2, characterized in that: Wherein, the medium pressure in the first mixing chamber and the high-pressure mixing tube is 80-150 MPa. 10. The high-pressure eddy current high-efficiency separation method for pollutants in soil according to any one of claims 1 to 9, characterized in that: Among them, the soil to be separated is crushed and screened in advance.

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