Self-cleaning ejector

Abstract

The invention discloses a self-cleaning ejector and belongs to the technical field of waste gas treatment.The self-cleaning ejector comprises a gas inlet pipe, the outer wall of the right side of the gas inlet pipe is connected with a mixing bin through a first connecting piece, the upper portion of the mixing bin communicates with a powder inlet pipe, and the right side of the mixing bin is connected with an ejection pipe through a second connecting piece; a vibrator is arranged below the right side of the mixing bin, a PLC electrically connected with the vibrator is arranged below the mixing bin, the outer wall of the left side of the mixing bin communicates with a plurality of high-pressure branch pipes, the tail ends of the high-pressure branch pipes jointly communicate with a high-pressure main pipe, the tail end of the high-pressure main pipe communicates with a high-pressure air pipe, and the tail end of the high-pressure air pipe communicates with a water inlet pipe. According to the ejector structure, high-pressure airflow and a vibration mode are combined, the interior of the ejector can be effectively self-cleaned, the maintenance cost of the ejector is reduced, and the service life of the ejector is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment equipment, in particular to a self-cleaning ejector. Background Art

[0002] Powder dosing technology is used to control flue gas emission indicators. It mainly sprays specific solid powder into the flue and uses physical adsorption and / or chemical reactions to remove pollutants in the flue gas, thereby purifying the flue gas and meeting emission standards.

[0003] Currently, most parts of the solid waste incineration industry use powder dosing to control flue gas emissions or pre-coat dust collectors. Powder dosing systems primarily include sodium bicarbonate injection systems, slaked lime injection systems, and activated carbon injection systems. These systems use pneumatic conveying, utilizing Roots blowers, ejectors, and metering devices, to deliver the appropriate powders into the flue. However, the ejectors often become clogged due to moisture and other factors, forcing the system to be shut down for maintenance. Some projects purchase a spare set of ejectors to replace in the event of blockage. Both replacement and maintenance require downtime, delaying operations and even causing emissions to exceed standards. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a self-cleaning ejector.

[0005] The technical solution of the present invention is: a self-cleaning injector, comprising an air inlet pipe, the right outer wall of the air inlet pipe is connected to a mixing bin through a connecting piece 1, the top of the mixing bin is connected to a powder inlet pipe, the right side of the mixing bin is connected to an injection pipe through a connecting piece 2, a vibrator is provided below the right side of the mixing bin, a PLC controller electrically connected to the vibrator is provided below the mixing bin, a plurality of high-pressure branch pipes are connected to the left outer wall of the mixing bin, the ends of the plurality of high-pressure branch pipes are commonly connected to a high-pressure main pipe, and the end of the high-pressure main pipe is connected to a high-pressure air pipe.

[0006] Furthermore, the connecting member 1 includes a connecting plate 1 fixed to the right outer wall of the air intake pipe and a connecting plate 2 fixed to the left side of the mixing chamber, and the connecting plate 1 and the connecting plate 2 are fixed by a bolt 1.

[0007] Note: Connecting plate 1 and connecting plate 2 are fixed by bolt 1. This connection method facilitates the processing and assembly of the workpiece and enhances the airtightness of the connection between the intake pipe and the mixing chamber.

[0008] Furthermore, the second connecting member includes a third connecting plate fixed to the right outer wall of the mixing chamber and a fourth connecting plate fixed to the left outer wall of the injection pipe, and the third connecting plate and the fourth connecting plate are fixed by a second bolt.

[0009] Note: Connecting disc 3 and connecting disc 4 are fixed by bolt 2. This connection method facilitates the processing and assembly of the workpiece and enhances the airtightness of the connection between the mixing chamber and the mixing injection pipe.

[0010] Furthermore, the vibrator includes an interlocking ring fixed to the bottom of the mixing bin, and a vibration plate movably engaged in the interlocking ring, a hinge groove is provided on the left side of the interlocking ring, and engaging grooves are provided on the front, rear and right sides of the interlocking ring, a hinge column is provided on the right side of the vibration plate, and the hinge column is rotatably connected in the interlocking groove, and engaging strips are provided on the front, rear and right sides of the vibration plate, and the engaging strips are movably engaged in the engaging groove, and a power mechanism for driving the vibration plate to vibrate is fixed to the bottom outer wall of the mixing bin.

[0011] Description: The vibration plate moves up and down around the hinge groove, and the clamping strip reciprocates up and down in the clamping groove, which can not only improve the airtightness in the mixing chamber, but also increase the vibration amplitude of the vibration plate, thereby breaking up the compacted or agglomerated powder and discharging it from the injection pipe, which can effectively prevent the mixing chamber from being blocked and causing a decrease in the amount of sprayed powder.

[0012] Furthermore, the power mechanism includes an articulated seat fixed to the outer wall of the bottom of the mixing bin, a movable rod is hinged on the articulated seat, and sliding grooves are provided on the left and right sides of the movable rod. A connecting rod 1 is provided under the vibration plate, and the lower end of the connecting rod 1 is movably engaged with the sliding groove on the left side of the movable rod. A rotating motor fixed to the bottom of the mixing bin is provided on the right side of the articulated seat, and a connecting rod 2 is transmission-connected to the output shaft of the rotating motor, and the end of the connecting rod 2 is movably engaged in the sliding groove on the right side of the movable rod.

[0013] Description: Rotating the motor drives connecting rod 2 to rotate. The rotation of connecting rod 2 causes the right end of the movable rod to move up and down. The up and down movement of the right end of the movable rod drives the left end of the movable rod to move up and down, and then drives connecting rod 1 to move up and down. The up and down movement of connecting rod 1 drives the vibration plate to move up and down, thereby achieving the vibration effect of the vibration plate.

[0014] Furthermore, the middle part of the high-pressure main pipeline is provided with a high-pressure gas solenoid valve, a pressure regulating and filtering device, and a manual ball valve in sequence from the proximal end to the distal end, and the high-pressure gas solenoid valve and the pressure regulating and filtering device are both electrically connected to the PLC controller.

[0015] Description: The operation of the high-pressure gas solenoid valve and the pressure regulating filter device is controlled by the PLC controller to achieve automatic control. The manual ball valve can realize the manual control of the ventilation and closing of the high-pressure main pipe at the proximal end.

[0016] Furthermore, a weighing sensor electrically connected to the PLC controller is embedded on the upper surface of the vibration plate.

[0017] Note: According to the weight of the weighing sensor, the rotating motor can be selectively started to drive the vibration of the vibration plate. In this way, the vibration plate does not need to vibrate for a long time. The rotation motor can be started based on the weight of the powder accumulated on the vibration plate.

[0018] Furthermore, the upper end of the powder inlet pipe, the right end of the injection pipe, and the left end of the air inlet pipe are all provided with flanges for externally connecting pipelines.

[0019] Note: The flange is convenient for connecting the powder inlet pipe, air inlet pipe and injection pipe to external pipes.

[0020] Furthermore, the right end of the air inlet pipe is connected to a contraction tube, and the contraction tube is located inside the mixing chamber.

[0021] Description: The shrink tube can increase the gas flow rate inside the shrink tube, making the gas flow rate into the mixing chamber higher, forming a stronger negative pressure effect, and having a stronger adsorption capacity for the powder in the powder inlet pipe.

[0022] Furthermore, inclined injection pipes are provided at the connection points between the plurality of high-pressure branch pipes and the mixing chamber.

[0023] Description: The inclined injection pipe forms a spiral high-pressure cyclone, which allows the powder attached to the inner wall of the mixing chamber to separate from the inner wall of the mixing chamber under the disturbance of the air flow and be discharged from the injection pipe.

[0024] The beneficial effects of the present invention are:

[0025] The design of the inclined injection pipe of the present invention allows high-pressure gas to be injected in a spiral shape and rotate inward. The high-pressure air quickly impacts the material compacted on the pipe wall, causing the material to fall off, float up under the disturbance of the airflow, and then be discharged from the injection pipe. The PLC controller can also be triggered to vibrate according to the properties of the material and the ash blockage situation. The PLC controller sends instructions to control the operation of the vibrator, so that the compacted material is completely decomposed and dropped. The gas flow rate in the mixing bin is faster than that in the powder feed pipe, so the air pressure in the mixing bin is lower than that in the powder feed pipe. After the powder enters the mixing bin under the action of negative pressure, it is ejected through the injection pipe. The injector structure of the present invention can effectively self-clean the interior of the injector by combining high-pressure airflow and vibration, thereby reducing the maintenance cost of the injector and extending the service life of the injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a right side view of the connection between the mixing bin and the inclined injection pipe of the present invention.

[0028] Figure 3 It is a top view of the connection relationship between the interlocking ring and the vibration plate of the present invention.

[0029] Figure 4 yes Figure 3 Cross-section view at AA in the middle.

[0030] Figure 5 yes Figure 3 Cross-section view at the middle BB.

[0031] Figure 6 yes Figure 3 Cross-section view at CC.

[0032] Figure 7 It is a structural schematic diagram of the power mechanism of the present invention.

[0033] Among them, 1-inlet pipe, 2-connector 1, 3-mixing bin, 4-powder inlet pipe, 5-connector 2, 6-injection pipe, 7-vibrator, 8-PLC controller, 9-high-pressure branch pipe, 91-high-pressure main pipe, 92-high-pressure air pipe, 21-connection plate 1, 22-connection plate 2, 23-bolt 1, 51-connection plate 3, 52-connection plate 4, 53-bolt 2, 71-fitting ring, 72-vibration plate, 73-power Mechanism, 711-hinge slot, 712-clamping slot, 721-hinge column, 722-clamping strip, 731-hinge seat, 732-movable rod, 733-sliding slot, 734-connecting rod 1, 735-rotating motor, 736-connecting rod 2, 94-high-pressure gas solenoid valve, 95-pressure regulating and filtering device, 96-manual ball valve, 74-weighing sensor, 10-flange, 11-contraction tube, 97-tilted injection pipe. DETAILED DESCRIPTION

[0034] Example 1:

[0035] like Figure 1 As shown, a self-cleaning injector includes an air inlet pipe 1, the right outer wall of the air inlet pipe 1 is connected to a mixing bin 3 through a connector 1 2, the top of the mixing bin 3 is connected to a powder inlet pipe 4, the right side of the mixing bin 3 is connected to an injection pipe 6 through a connector 2 5, a vibrator 7 is provided below the right side of the mixing bin 3, a PLC controller 8 electrically connected to the vibrator 7 is provided below the mixing bin 3, a plurality of high-pressure branch pipes 9 are connected to the left outer wall of the mixing bin 3, the ends of the plurality of high-pressure branch pipes 9 are commonly connected to a high-pressure main pipe 91, and the end of the high-pressure main pipe 91 is connected to a high-pressure air pipe 92.

[0036] The connecting piece 2 includes a connecting plate 1 21 fixed to the right outer wall of the air intake pipe 1 and a connecting plate 2 22 fixed to the left side of the mixing chamber 3 . The connecting plate 1 21 and the connecting plate 2 22 are fixed by a bolt 1 23 .

[0037] The connecting plate 1 21 and the connecting plate 2 22 are fixed by bolt 1 23 . This connection method facilitates the processing and assembly of the workpiece, and at the same time enhances the airtightness of the connection between the air intake pipe 1 and the mixing chamber 3 .

[0038] The second connecting member 5 includes a third connecting plate 51 fixed to the right outer wall of the mixing chamber 3 and a fourth connecting plate 52 fixed to the left outer wall of the injection pipe 6. The third connecting plate 51 and the fourth connecting plate 52 are fixed by a second bolt 53.

[0039] The connecting plate 3 51 and the connecting plate 4 52 are fixed by the bolt 2 53 . This connection method facilitates the processing and assembly of the workpiece, and at the same time enhances the airtightness of the connection between the mixing chamber 3 and the mixing injection pipe 6 .

[0040] The vibrator 7 includes a fitting ring 71 fixed to the bottom of the mixing chamber 3, and a vibration plate 72 movably engaged in the fitting ring 71. A hinge groove 711 is provided on the left side of the fitting ring 71, and a clamping groove 712 is provided on the front, rear and right sides of the fitting ring 71. A hinge column 721 is provided on the right side of the vibration plate 72, and the hinge column 721 is rotatably connected in the hinge groove 711. A clamping strip 722 is provided on the front, rear and right sides of the vibration plate 72, and the clamping strip 722 is movably engaged in the clamping groove 712. A power mechanism 73 for driving the vibration plate 72 to vibrate is fixed to the bottom outer wall of the mixing chamber 3.

[0041] The vibration plate 72 moves up and down around the hinge groove 711, and the clamping strip 722 moves back and forth up and down in the clamping groove 712, which can not only improve the airtightness in the mixing bin 3, but also increase the vibration amplitude of the vibration plate 72, thereby causing the compacted or agglomerated powder to be shattered and discharged from the injection pipe 6, which can effectively prevent the mixing bin 3 from being blocked and causing the amount of sprayed powder to decrease.

[0042] The power mechanism 73 includes a hinged seat 731 fixed to the outer wall of the bottom of the mixing bin 3, and a movable rod 732 is hinged on the hinged seat 731. Sliding grooves 733 are provided on the left and right sides of the movable rod 732. A connecting rod 1 734 is provided under the vibration plate 72, and the lower end of the connecting rod 1 734 is movably engaged with the sliding groove 733 on the left side of the movable rod 732. A rotating motor 735 fixed to the bottom of the mixing bin 3 is provided on the right side of the hinged seat 731, and a connecting rod 2 736 is transmission-connected on the output shaft of the rotating motor 735. The end of the connecting rod 2 736 is movably engaged in the sliding groove 733 on the right side of the movable rod 732.

[0043] The rotating motor 735 drives the connecting rod 2 736 to rotate. The rotation of the connecting rod 2 736 causes the right end of the movable rod 732 to move up and down. The up and down movement of the right end of the movable rod 732 drives the left end of the movable rod 732 to move up and down, and then drives the connecting rod 1 734 to move up and down. The up and down movement of the connecting rod 1 734 drives the vibration plate 72 to reciprocate up and down, thereby achieving the vibration effect of the vibration plate 72.

[0044] Example 2:

[0045] The difference between this embodiment and Example 1 is that, in this embodiment, the middle part of the high-pressure main pipe 91 is provided with a high-pressure gas solenoid valve 94, a pressure regulating filter device 95, and a manual ball valve 96 in sequence from the proximal end to the distal end. The high-pressure gas solenoid valve 94 and the pressure regulating filter device 95 are both electrically connected to the PLC controller 8. The high-pressure gas solenoid valve 94 adopts existing technology, such as AirTac 3V210-04, the pressure regulating filter device 95 adopts existing technology, such as AirTac BFC-2000, and the manual ball valve 96 adopts existing technology, such as Wenzhou Xingteng Fluid Equipment Co., Ltd. Q11F-16P two-piece ball valve.

[0046] Compared with Example 1, in this embodiment, the operation of the high-pressure gas solenoid valve 94 and the pressure regulating filter device 95 is controlled by the PLC controller 8, thereby realizing automatic control, and the manual ball valve 96 can realize the manual control of the ventilation and closing of the high-pressure main pipe 91 at the proximal end.

[0047] Example 3:

[0048] The difference between this embodiment and the second embodiment is that a weighing sensor 74 electrically connected to the PLC controller 8 is embedded on the upper surface of the vibration plate 72 in this embodiment.

[0049] Compared with Example 2, this embodiment can selectively start the rotating motor 735 according to the weight of the weighing sensor 74, thereby driving the vibration plate 72 to vibrate. In this way, there is no need for the vibration plate 72 to vibrate for a long time, and whether to start the rotating motor 735 is determined based on the weight of the powder accumulated on the vibration plate 72.

[0050] Example 4:

[0051] The difference between this embodiment and embodiment 3 is that in this embodiment, the upper end of the powder inlet pipe 4, the right end of the injection pipe 6, and the left end of the air inlet pipe 1 are all provided with flanges 10 for external pipe connection.

[0052] Compared with Example 3, the flange 10 in this embodiment facilitates external connection of the powder inlet pipe 4 , the air inlet pipe 1 and the injection pipe 6 to the pipeline.

[0053] Example 5:

[0054] The difference between this embodiment and embodiment 4 is that in this embodiment, the right end of the air inlet pipe 1 is connected to a contraction tube 11 , and the contraction tube 11 is located inside the mixing chamber 3 .

[0055] Compared with Example 4, the shrink tube 11 in this embodiment can increase the gas flow rate in the shrink tube 11, so that the gas flow rate into the mixing chamber 3 is higher, the negative pressure effect is stronger, and the adsorption capacity of the powder in the powder inlet pipe 4 is stronger.

[0056] Example 6:

[0057] The difference between this embodiment and embodiment 5 is that, in this embodiment, inclined injection pipes 97 are provided at the connection points between the plurality of high-pressure branch pipes 9 and the mixing chamber 3 .

[0058] Compared with Example 5, in this embodiment, a spiral high-pressure cyclone is formed by tilting the injection pipe 97 so that the powder attached to the inner wall of the mixing bin 3 is separated from the inner wall of the mixing bin 3 under the disturbance of the airflow and discharged from the injection pipe 6.

[0059] A method for operating a self-cleaning ejector in Example 6 comprises the following steps:

[0060] S1, air enters the mixing chamber 3 through the air inlet pipe 1 and the contraction tube 11. After entering the contraction tube, the air flow rate increases, thereby increasing the flow rate of air entering the mixing chamber 3. After the air flow rate in the mixing chamber 3 increases, the air pressure in the powder inlet pipe 4 decreases, causing the powder in the powder inlet pipe 4 to be sucked into the mixing chamber 3 and then ejected from the injection pipe 6;

[0061] S2. After the ejector has been working for a period of time, some powder will be adsorbed on the inner wall of the mixing bin 3 and accumulated, causing the mixing bin 3 to be blocked. The accumulated amount of powder is detected by the weighing sensor 74, and the high-pressure gas solenoid valve 94 is controlled by the PLC controller 8 to open. The high-pressure gas enters the inclined injection pipe 97 after pressure regulation by the pressure regulating and filtering device 95, forming a high-pressure cyclone in the mixing bin 3. At the same time, the PLC controller 8 controls the rotation motor 735 to drive the second connecting rod 736 to rotate. The rotation of the second connecting rod 736 causes the right end of the movable rod 732 to move up and down. The up and down movement of the right end of the movable rod 732 drives the left end of the movable rod 732 to move up and down, thereby driving the first connecting rod 734 to move up and down. The up and down movement of the first connecting rod 734 drives the vibration plate 72 to reciprocate up and down, realizing the vibration effect of the vibration plate 72, so that the powder adsorbed on the vibration plate is broken and falls off, and finally ejected from the injection pipe 6 under the action of the air flow to achieve the effect of self-cleaning;

[0062] S3 and PLC controller 8 can also be connected to the factory's DCS control system to achieve remote control and monitoring.

[0063] The PLC controller 8, rotating motor 735, high-pressure gas solenoid valve 94, pressure regulating filter device 95, manual ball valve 96, and weighing sensor 74 used in the above embodiments are all commercially available products. As long as they can achieve the functions of the present invention, those skilled in the art can choose to use them according to common sense, and no special restrictions are made here.

Claims

1. A self-cleaning ejector, characterized in that: The invention comprises an air inlet pipe (1), wherein the right outer wall of the air inlet pipe (1) is connected to a mixing bin (3) via a connector 1 (2), the upper portion of the mixing bin (3) is connected to a powder inlet pipe (4), the right side of the mixing bin (3) is connected to a spray pipe (6) via a connector 2 (5), a vibrator (7) is provided below the right side of the mixing bin (3), a PLC controller (8) electrically connected to the vibrator (7) is provided below the mixing bin (3), a plurality of high-pressure branch pipes (9) are connected to the left outer wall of the mixing bin (3), the ends of the plurality of high-pressure branch pipes (9) are commonly connected to a high-pressure main pipe (91), and the end of the high-pressure main pipe (91) is connected to a high-pressure air pipe (92).

2. A self-cleaning ejector according to claim 1, characterized in that: The connecting member 1 (2) comprises a connecting plate 1 (21) fixed to the right outer wall of the air inlet pipe (1) and a connecting plate 2 (22) fixed to the left side of the mixing chamber (3), and the connecting plate 1 (21) and the connecting plate 2 (22) are fixed by a bolt 1 (23).

3. A self-cleaning ejector according to claim 1, characterized in that: The second connecting member (5) comprises a third connecting plate (51) fixed to the right outer wall of the mixing chamber (3) and a fourth connecting plate (52) fixed to the left outer wall of the injection pipe (6), and the third connecting plate (51) and the fourth connecting plate (52) are fixed by a second bolt (53).

4. A self-cleaning ejector according to claim 1, characterized in that: The vibrator (7) comprises a fitting ring (71) fixed to the bottom of the mixing chamber (3), and a vibration plate (72) movably engaged in the fitting ring (71); a hinge groove (711) is provided on the left side of the fitting ring (71); a clamping groove (712) is provided on the front, rear and right sides of the fitting ring (71); a hinge column (721) is provided on the right side of the vibration plate (72); the hinge column (721) is rotatably connected in the hinge groove (711); a clamping strip (722) is provided on the front, rear and right sides of the vibration plate (72); the clamping strip (722) is movably engaged in the clamping groove (712); and a power mechanism (73) for driving the vibration plate (72) to vibrate is fixed to the outer wall of the bottom of the mixing chamber (3).

5. A self-cleaning ejector according to claim 4, characterized in that: The power mechanism (73) includes a hinge seat (731) fixed on the outer wall of the bottom of the mixing bin (3), a movable rod (732) is hinged on the hinge seat (731), and sliding grooves (733) are provided on the left and right sides of the movable rod (732). A connecting rod (734) is provided below the vibration plate (72), and the lower end of the connecting rod (734) is movably engaged with the sliding groove (733) on the left side of the movable rod (732). A rotating motor (735) fixed to the bottom of the mixing bin (3) is provided on the right side of the hinge seat (731), and a connecting rod (736) is connected to the output shaft of the rotating motor (735) in a transmission manner, and the end of the connecting rod (736) is movably engaged in the sliding groove (733) on the right side of the movable rod (732).

6. A self-cleaning injector according to claim 1, characterized in that: The middle part of the high-pressure main pipe (91) is provided with a high-pressure gas electromagnetic valve (94), a pressure regulating filter device (95), and a manual ball valve (96) in sequence from the proximal end to the distal end.

7. A self-cleaning injector according to claim 4, characterized in that: A weighing sensor (74) electrically connected to the PLC controller (8) is embedded on the upper surface of the vibration plate (72).

8. A self-cleaning injector according to claim 1, characterized in that: The upper end of the powder inlet pipe (4), the right end of the injection pipe (6), and the left end of the air inlet pipe (1) are all provided with flanges (10) for connecting to external pipelines.

9. A self-cleaning injector according to claim 1, characterized in that: The right end of the air inlet pipe (1) is connected to a contraction pipe (11), and the contraction pipe (11) is located inside the mixing chamber (3).

10. A self-cleaning injector according to claim 1, characterized in that: The right end of the air inlet pipe (1) is connected to a shrinkage pipe (11) extending into the interior of the mixing chamber (3).

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