A mobile soil pollution ex-situ remediation spraying device and a method of using the same

Abstract

The application provides a mobile soil pollution ex-situ remediation spraying device and a use method thereof. The spraying head of the spraying device comprises a shell, a piston sleeve and a thimble. A liquid inlet cylinder is arranged in the shell. An active cavity is arranged between the liquid inlet cylinder and the shell. The upper end of the piston sleeve is slidably arranged in the active cavity. The lower end of the piston sleeve is provided with a spraying hole. A supporting spring is arranged between the piston sleeve and the shell. An axial through hole is arranged in the thimble. The upper end of the thimble is fixed in the liquid inlet cylinder. The lower end of the thimble penetrates through the spraying hole and is provided with a first duckbill valve which is communicated with the axial through hole. A cyclone is sleeved on the thimble. The lower end of the cyclone is provided with an umbrella valve. The piston sleeve below the cyclone is a liquid outlet cavity which is communicated with the spraying hole. The active cavity on the upper side of the piston sleeve is a gas cavity. The gas cavity is provided with a second duckbill valve which is communicated with the outside and a gas hole which is communicated with the axial through hole. The application avoids the residual of the remediation liquid in the liquid outlet cavity and the spraying hole, thereby preventing the clogging of the spraying hole.

Description

Technical Field

[0001] This invention relates to the field of contaminated soil remediation technology, and in particular to a mobile ex-situ remediation spraying device for contaminated soil and its usage method. Background Technology

[0002] The method for remediating contaminated soil is as follows: Soil remediation agent is mixed with water to obtain a remediation solution, which is then atomized and sprayed onto the contaminated soil using a spray nozzle. For Cr(VI) contaminated soil, the soil remediation agents are common strong reducing agents such as calcium polysulfide, ferrous sulfate, and sodium dithionite, which are highly reactive and corrosive, easily corroding metal spray devices and causing clogging of the spray nozzles. While replacing metal materials with plastic materials can reduce the corrosion of the spray device by the remediation solution, the existing spray nozzle structure limits the possibility of scale buildup at the spray holes, causing clogging.

[0003] Chinese patent document CN101428255B discloses an anti-clogging nozzle that uses a needle and an axially moving piston to prevent clogging of the nozzle. However, if this structure is used for spraying soil remediation fluid, although the needle insertion inside the nozzle can prevent remediation fluid residue, remediation fluid may still remain in the piston cavity communicating with the nozzle and on the outside of the nozzle. This can easily lead to scaling, causing the needle and nozzle to stick and become blocked, affecting the axial movement of the piston and the spraying effect. Summary of the Invention

[0004] This invention proposes a mobile ex-situ remediation spraying device for contaminated soil and its usage method, which avoids the presence of remediation fluid residue in the outlet chamber and spray holes, thereby preventing scaling and clogging of the spray holes.

[0005] The technical solution of this invention is implemented as follows: A mobile ex-situ remediation spraying device for contaminated soil includes a mobile support, on which spray pipes are arranged, and spray heads are provided on the spray pipes. Each spray head includes a shell, a piston sleeve, and a pin. An inlet cylinder is provided inside the shell, and a movable cavity is provided between the inlet cylinder and the shell. The upper end of the piston sleeve is slidably placed in the movable cavity, and a spray hole is provided at the lower end. A support spring is provided between the piston sleeve and the shell. An axial through hole is provided inside the pin, and the upper end of the pin is fixed inside the inlet cylinder. The lower end of the pin passes through the spray hole and is provided with a first duckbill valve communicating with the axial through hole. A hydrocyclone is fitted on the pin, and an umbrella valve is provided at the lower end of the hydrocyclone. The piston sleeve below the hydrocyclone is a liquid outlet chamber, which communicates with the spray hole. The movable cavity on the upper side of the piston sleeve is an air chamber, which is provided with a second duckbill valve communicating with the outside and an air hole communicating with the axial through hole.

[0006] Furthermore, the outer side of the liquid inlet cylinder is provided with a spiral protrusion along the axial direction, and the inner side of the piston sleeve is provided with a spiral groove that slides along the spiral protrusion.

[0007] Furthermore, the outer shell includes an upper shell, the lower end of which is threadedly connected to a coaxial lower shell. The upper end of the liquid inlet cylinder is placed inside the upper shell and connected to the upper shell through an end plate. The end plate is provided with a liquid inlet hole communicating with the liquid inlet cylinder, and the upper side of the end plate is a nozzle. The upper shell, the liquid inlet cylinder and the end plate are an integral structure.

[0008] Furthermore, the hydrocyclone includes a hydrocyclone body with hydrocyclone holes evenly distributed circumferentially on the hydrocyclone body. The liquid inlet cylinder is connected to the liquid outlet chamber via the hydrocyclone holes and the umbrella valve in sequence.

[0009] Furthermore, a first sealing ring is provided between the piston sleeve and the inlet cylinder, and the first sealing ring is located below the spiral protrusion.

[0010] Furthermore, a second sealing ring is provided between the piston sleeve and the moving cavity, and a third sealing ring is provided at the junction of the lower housing and the upper housing.

[0011] Furthermore, it also includes a stirring device, which is connected to the spray pipe via a liquid pump, and the spray pipe is also equipped with a flow meter.

[0012] Furthermore, the mobile support includes a grid-arranged frame, with vertical poles fixed at the four corners of the lower end of the frame, and brake wheels installed at the lower ends of the vertical poles. The spray pipes and spray heads are also arranged in a grid pattern; both the spray pipes and spray heads are made of PE material.

[0013] A method for using a mobile spray device for ex-situ remediation of contaminated soil includes the following steps:

[0014] (1) Move the mobile support to the top of the soil to be repaired. Under pressure, the repair liquid enters the inlet cylinder of the spray head through the spray pipe, enters the outlet chamber through the hydrocyclone and umbrella valve, and pushes the piston sleeve down along the movable chamber. The support spring is compressed, and the lower end of the pin is separated from the spray hole. The repair liquid is sprayed on the soil to be repaired through the spray hole. During the downward movement of the piston sleeve, the air chamber space increases and outside air enters the movable chamber through the second duckbill valve.

[0015] (2) After the repair fluid stops spraying, the support spring drives the piston sleeve to move up and reset. During the reset process, the air chamber space decreases and the air in the air chamber is blown out through the air hole, axial through hole and first duckbill valve, blowing the repair fluid remaining in the outlet chamber and spray hole away from the piston sleeve and spray hole. The lower end of the ejector pin passes through the spray hole. The repair fluid remaining in the inlet cylinder cannot enter the outlet chamber through the umbrella valve without pressure.

[0016] Furthermore, in step (1), during the downward movement of the piston sleeve, the spiral groove slides along the spiral protrusion, and the piston sleeve rotates circumferentially while moving downward.

[0017] The beneficial effects of this invention are:

[0018] In the spray head of the spray device of this invention, the high-pressure repair fluid pushes the piston sleeve axially downward. During the process of the ejector pin disengaging from the spray nozzle, the air chamber space increases and the pressure decreases. Outside air enters the air chamber through the second duckbill valve, cutting off the high-pressure repair fluid. During the process of the piston sleeve moving upward and resetting, the air chamber space decreases and the pressure increases. The air in the air chamber is sprayed out through the air hole, the axial through hole and the first duckbill valve, blowing away the liquid at the liquid outlet chamber and the spray hole, avoiding repair fluid residue, thereby preventing scaling and preventing the spray hole from being blocked. Moreover, with the umbrella valve, it also prevents the repair fluid remaining in the liquid inlet cylinder from entering the liquid outlet chamber. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the spray device of the present invention;

[0021] Figure 2 This is a top view of the movable support.

[0022] Figure 3 This is a schematic diagram of the spray head in Example 1;

[0023] Figure 4 This is a schematic diagram of the spray head in Example 2.

[0024] 1. Movable support; 2. Stirring device; 3. Spray pipe; 4. Spray head; 5. Infusion pump; 6. Air hole; 7. Flow meter; 8. Piston sleeve; 9. Top pin; 10. Upper housing; 11. Lower housing; 12. Third sealing ring; 13. End plate; 14. Inlet cylinder; 15. Inlet hole; 16. Movable chamber; 17. Air chamber; 18. Spray hole; 19. Support spring; 20. Axial through hole; 21. First duckbill valve; 22. Hydrocyclone; 23. Hydrocyclone hole; 24. Umbrella valve; 25. Outlet chamber; 26. Second duckbill valve; 27. First sealing ring; 28. Second sealing ring; 29. ​​Spiral protrusion; 30. Spiral groove. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 1-2 As shown, a mobile ex-situ remediation spraying device for contaminated soil includes a mobile support frame 1 and a mixing device 2. The mobile support frame 1 includes a grid-arranged frame, with vertical poles fixed at the four corners of the lower end of the frame, and brake wheels installed at the lower ends of the vertical poles. The mobile support frame 1 is designed to facilitate the relocation of the spraying device as needed, positioning it above the soil to be remediated. The soil to be remediated is soil taken from the contaminated site, which, after drying, crushing, and screening, is spread flat inside the plant for ex-situ remediation.

[0028] The mobile support 1 has spray pipes 3 arranged on it, and spray heads 4 are installed on the spray pipes 3. According to the spraying needs, the spray pipes 3 and spray heads 4 are arranged in a grid pattern. The mixing device 2 is connected to the spray pipes 3 via a pump 5, and a flow meter 7 is also installed on the spray pipes 3. The pump 5 is a self-priming pump, and the flow meter 7 is a precision turbine flow meter. The mobile support 1 is moved to the upper side of the soil to be remediated. The remediation agent and water are mixed evenly in the mixing device 2 to obtain the remediation solution. This solution is then pumped into the spray pipes 3 via the pump 5 and flow meter 7, and then atomized and sprayed out through the spray heads 4. The grid-arranged spray heads 4 form a uniform atomized spray zone on the upper side of the contaminated soil, facilitating the small-flow, even spraying of the remediation solution into the contaminated soil and avoiding large disturbances and uneven spraying. The mixing tank and mixing blades of the mixing device 2, as well as the spray pipes 3 and spray heads 4, are all made of PE plastic. Compared to metal materials, plastic helps to prevent the remediation agent from corroding the spraying device. The flow meter 7 allows for precise control of the amount of repair fluid added.

[0029] like Figure 3 As shown, the spray head 4 includes a housing, a piston sleeve 8, and a ejector pin 9. The housing includes an upper housing 10, with a lower housing 11 coaxially connected to the lower end of the upper housing 10 via a threaded connection. A third sealing ring 12 is provided at the junction of the lower housing 11 and the upper housing 10. An end plate 13 is provided inside the upper housing 10, with a nozzle on the upper side of the end plate 13. The spray head 4 is connected to the spray pipe 3 via the nozzle and a PVC retaining ring tee. An inlet cylinder 14 is fixed to the lower end of the end plate 13. The upper housing 10, the end plate 13, and the inlet cylinder 14 are coaxial integral structures. An inlet hole 15 communicating with the inlet cylinder 14 is provided on the end plate 13, through which the repair fluid enters the inlet cylinder 14.

[0030] A movable cavity 16 is provided between the liquid inlet cylinder 14 and the outer shell. The upper end of the movable cavity 16 is a sealed end. The upper end of the piston sleeve 8 is slidably placed in the movable cavity 16. The movable cavity 16 on the upper side of the piston sleeve 8 is a gas chamber 17. A spray hole 18 is provided at the lower end of the piston sleeve 8. A support spring 19 is provided between the piston sleeve 8 and the outer shell. The piston sleeve 8 is easy to reset by the support spring 19. An axial through hole 20 is provided in the ejector pin 9. The upper end of the ejector pin 9 is threadedly fixed to the end plate 13. The lower end of the ejector pin 9 passes through the spray hole 18 and is fixed with a first duckbill valve 21. The air inlet of the first duckbill valve 21 communicates with the axial through hole 20. The first duckbill valve 21 is a one-way valve. Gas can only flow out through the axial through hole 20 and the first duckbill valve 21, while outside air cannot enter the axial through hole 20 in the opposite direction through the first duckbill valve 21.

[0031] A hydrocyclone 22 is fitted onto the ejector pin 9. The hydrocyclone 22 includes a hydrocyclone body with cyclone holes 23 evenly distributed circumferentially on the hydrocyclone body. A parasol valve 24 is fixed to the lower end of the hydrocyclone 22. The piston sleeve 8 below the hydrocyclone 22 contains a liquid outlet chamber 25, which communicates with the spray hole 18. The inlet cylinder 14 communicates with the liquid outlet chamber 25 via the cyclone holes 23 and the parasol valve 24. The parasol valve 24 is a diaphragm, with its middle part fixed to the lower end of the hydrocyclone body and its edge blocking the lower end of the cyclone holes 23. Under pressure, the repair fluid enters the cyclone holes 23 through the inlet cylinder 14, pushing the edge of the parasol valve 24 to bend, thereby opening the cyclone holes 23. After spraying, the repair fluid remaining in the inlet cylinder 14 cannot bend the edge of the parasol valve 24 due to the lack of pressure, and therefore cannot enter the liquid outlet chamber 25.

[0032] A second duckbill valve 26 is fixed inside the air chamber 17. The air inlet of the second duckbill valve 26 is open to the outside. The second duckbill valve 26 is a one-way valve. Outside air enters the air chamber 17 through the second duckbill valve 26, while the air inside the air chamber 17 cannot be discharged through the second duckbill valve 26. There is also an air hole 6 inside the air chamber 17 that is open to the axial through hole 20. The air inside the air chamber 17 can be discharged through the air hole 6, the axial through hole 20, and the first duckbill valve 21 through the lower end of the ejector pin 9. The first duckbill valve 21, the umbrella valve 24, and the second duckbill valve 26 are all existing conventional structures.

[0033] A first sealing ring 27 is provided between the piston sleeve 8 and the inlet cylinder 14 to prevent the repair fluid from entering the movable chamber 16. A second sealing ring 28 is provided between the piston sleeve 8 and the movable chamber 16 to ensure the airtightness of the gas chamber 17.

[0034] The method of using the mobile ex-situ remediation spraying device for contaminated soil includes the following steps:

[0035] (1) Move the mobile support 1 to the upper side of the soil to be repaired. Under pressure, the repair liquid enters the inlet cylinder 14 of the spray head 4 through the spray pipe 3, enters the outlet chamber 25 through the hydrocyclone 22 and umbrella valve 24, and pushes the piston sleeve 8 down along the movable chamber 16. The support spring 19 is compressed, and the lower end of the pin 9 is separated from the spray hole 18. The repair liquid is sprayed on the soil to be repaired through the spray hole 18. During the downward movement of the piston sleeve 8, the space of the air chamber 17 increases and the pressure decreases. Outside air enters the movable chamber 16 through the second duckbill valve 26.

[0036] (2) After the repair fluid stops spraying, the support spring 19 drives the piston sleeve 8 to move up and reset. During the reset process, the space of the air chamber 17 decreases and the pressure increases. The air in the movable chamber 16 is blown out through the air hole 6, the axial through hole 20 and the first duckbill valve 21, blowing the repair fluid remaining in the outlet chamber 25 and the spray hole 18 away from the piston sleeve 8. The lower end of the ejector pin 9 passes through the spray hole 18. The repair fluid remaining in the inlet cylinder 14 cannot enter the outlet chamber 25 through the umbrella valve 24 without pressure.

[0037] Example 2

[0038] This embodiment is basically the same as Embodiment 1, except that, as Figure 4 As shown, a spiral protrusion 29 is fixed axially on the outer side of the inlet cylinder 14, and a spiral groove 30 that slides along the spiral protrusion 29 is provided on the inner side of the piston sleeve 8. The first sealing ring 27 is located below the spiral protrusion 29. During the downward movement of the piston sleeve 8, the spiral groove 30 slides along the spiral protrusion 29, and the piston sleeve 8 rotates circumferentially at the same time as it moves downward. Even if there is residual repair fluid at the spray hole 18, and the lower end of the ejector pin 9 is stuck and blocked with the spray hole 18, the circumferential rotation and downward movement of the piston sleeve 8 makes it easier for the two to separate.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mobile spraying device for ex-situ remediation of contaminated soil, comprising a mobile support frame, spray pipes arranged on the mobile support frame, and spray heads mounted on the spray pipes, each spray head comprising a housing, a piston sleeve, and a pin, characterized in that: The outer casing contains an inlet cylinder, and a movable cavity is provided between the inlet cylinder and the outer casing. The upper end of the piston sleeve slides within the movable cavity, and a spray hole is provided at the lower end. A support spring is provided between the piston sleeve and the outer casing. An axial through hole is provided inside the ejector pin, and the upper end of the ejector pin is fixed inside the inlet cylinder. The lower end of the ejector pin passes through the spray hole and is provided with a first duckbill valve communicating with the axial through hole. A hydrocyclone is fitted on the ejector pin, and an umbrella valve is provided at the lower end of the hydrocyclone. The piston sleeve below the hydrocyclone is an outlet chamber, which communicates with the spray hole. The movable cavity on the upper side of the piston sleeve is an air chamber, which is provided with a second duckbill valve communicating with the outside and an air hole communicating with the axial through hole. A spiral protrusion is provided on the outer side of the inlet cylinder along the axial direction, and a spiral groove is provided on the inner side of the piston sleeve that slides along the spiral protrusion. The method of using a mobile spray system for ex-situ remediation of contaminated soil includes the following steps: (1) Move the mobile support to the upper side of the soil to be repaired. Under pressure, the repair liquid enters the inlet cylinder of the spray head through the spray pipe, enters the outlet chamber through the hydrocyclone and umbrella valve, and pushes the piston sleeve down along the movable chamber. The support spring is compressed, and the lower end of the pin is separated from the spray hole. The repair liquid is sprayed on the soil to be repaired through the spray hole. During the process of the piston sleeve moving down, the air chamber space increases and the outside air enters the movable chamber through the second duckbill valve. (2) After the repair fluid stops spraying, the support spring drives the piston sleeve to move up and reset. During the reset process, the air chamber space decreases and the air in the air chamber is blown out through the air hole, axial through hole and first duckbill valve, blowing the repair fluid remaining in the outlet chamber and spray hole away from the piston sleeve and spray hole. The lower end of the ejector pin passes through the spray hole. The repair fluid remaining in the inlet cylinder cannot enter the outlet chamber through the umbrella valve without pressure.

2. The mobile ex-situ remediation spraying device for contaminated soil according to claim 1, characterized in that: The outer shell includes an upper shell, the lower end of which is threadedly connected to a coaxial lower shell. The upper end of the liquid inlet cylinder is placed inside the upper shell and connected to the upper shell through an end plate. The end plate is provided with a liquid inlet hole communicating with the liquid inlet cylinder, and the upper side of the end plate is a nozzle. The upper shell, the liquid inlet cylinder and the end plate are an integral structure.

3. The mobile ex-situ remediation spraying device for contaminated soil according to claim 1, characterized in that: The hydrocyclone includes a hydrocyclone body with cyclone holes evenly distributed along the circumference. The liquid inlet cylinder passes through the cyclone holes and the umbrella valve in sequence and communicates with the liquid outlet chamber.

4. The mobile ex-situ remediation spraying device for contaminated soil according to claim 1, characterized in that: A first sealing ring is provided between the piston sleeve and the inlet cylinder, and the first sealing ring is located below the spiral protrusion.

5. A mobile ex-situ remediation spraying device for contaminated soil according to claim 2, characterized in that: A second sealing ring is provided between the piston sleeve and the moving chamber, and a third sealing ring is provided at the junction of the lower housing and the upper housing.

6. A mobile ex-situ remediation spraying device for contaminated soil according to claim 1, characterized in that: A flow meter is also installed on the spray pipe.

7. A mobile ex-situ remediation spraying device for contaminated soil according to claim 1, characterized in that: The mobile support includes a grid-arranged frame, with vertical poles fixed at the four corners of the lower end of the frame. Brake wheels are installed at the lower ends of the vertical poles. The spray pipes and spray heads are also arranged in a grid pattern. Both the spray pipes and spray heads are made of PE material.

8. The mobile ex-situ remediation spraying device for contaminated soil according to claim 1, characterized in that, In step (1), during the downward movement of the piston sleeve, the spiral groove slides along the spiral protrusion, and the piston sleeve rotates circumferentially while moving downward.

Images