Return-spraying denitration device for leachate of garbage incinerator and use method of return-spraying denitration device

Abstract

The invention relates to the technical field of garbage leachate treatment, in particular to a garbage incinerator leachate back-spraying denitration device and a using method thereof.The device comprises a waste liquid container, an incinerator, an ammonia water container and a garbage storage cage, a containing notch is formed in the top of the waste liquid container, and a movable top plate is rotationally connected to the containing notch; the movable top plate is of an annular plate body structure, the garbage storage cage is arranged in the waste liquid container, the top of the garbage storage cage and the movable top plate are connected and rotate together, a plurality of first atomization spray guns are arranged on the peripheral side of the waste liquid container in a surrounding mode, and nozzles of the first atomization spray guns extend into the waste liquid container. The conveying pump is used for providing pressure to convey ammonia water in the ammonia water container to the first atomizing spray gun to be atomized and sprayed into the waste liquid container, the power device drives the movable top plate to rotate through the transmission mechanism, and the bottom of the waste liquid container is connected to the second atomizing spray gun with a nozzle extending into the incinerator through a pipeline. According to the invention, the thrown percolate can be in rapid and uniform contact with atomized ammonia water, so that the reaction rate of the percolate is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of landfill leachate treatment, and particularly relates to a landfill leachate backspray denitration device and a using method thereof. Background Art

[0002] During the stacking process of garbage in a domestic waste incineration plant, a complex wastewater with high concentrations of inorganic or organic components is formed due to biochemical degradation such as anaerobic fermentation, rainwater flushing, and organic matter decomposition, namely landfill leachate. Untreated landfill leachate pollutes water sources and soil through groundwater, thus causing serious impacts on the surrounding environment and human health. Therefore, it is necessary to harmlessly treat landfill leachate to effectively control the pollution of leachate. At present, the treatment of landfill leachate mainly uses the biochemical method, but this treatment process has disadvantages such as complex process, long treatment time, high treatment cost, large floor area, long construction time, and high maintenance cost. Due to the characteristics of simple process, low operation and maintenance cost, short construction time, small one-time investment, and low treatment cost of the backspray method, some waste incineration power plants have begun to widely use the backspray method to treat landfill leachate. Landfill leachate backspray denitration is a technology that combines landfill leachate with the denitration process. Its main principle is to utilize the ammonia nitrogen component in landfill leachate to react with nitrogen oxides in flue gas under high-temperature conditions, thereby achieving the purpose of denitration and further achieving the effect of harmless treatment of garbage.

[0003] A landfill leachate backspray denitration device and method proposed according to the patent with the publication number CN105157044B. In this prior art, the device includes a landfill leachate spray gun array, a thermocouple and an infrared thermometer in the first flue, an SNCR spray gun array, and a sensor at the flue outlet. The method is to first precipitate and filter the leachate and mix it with ammonia water, and according to the temperature value, perform flow control and automatic shutdown, and clean with clean water, as well as adjust the SNCR injection flow and the mixing concentration of ammonia water until the NO X value at the flue outlet meets the requirements. This prior art can make full use of the backspray operation of leachate, mix ammonia water and combine it with SNCR for overall denitration, reduce the water and compressed air sprayed into the denitration system, ensure the temperature of the boiler furnace, and greatly reduce the consumption of clean water, compressed air and electricity.

[0004] However, in the above prior art, the landfill leachate is discharged into a container and then mixed with ammonia water. Since the volume of landfill leachate is large, the direct stirring and mixing method cannot quickly and fully mix ammonia water with landfill leachate, which will affect the subsequent reaction efficiency. At the same time, ammonia water is prone to generating ammonia gas, and it is difficult for the landfill leachate in the container to react with the ammonia gas in the upper part of the container, and if the ammonia gas leaks, it will cause pollution. These technical problems need to be solved. Summary of the Invention

[0005] The object of the present invention is to provide a device for spraying and denitrifying leachate of a waste incinerator, which is used to solve the technical problems in the prior art that ammonia water cannot be quickly and fully mixed with waste leachate, and it is difficult for the waste leachate in the container to react with ammonia gas in the upper part of the container.

[0006] The described device for spraying and denitrifying leachate of a waste incinerator includes a waste liquid container, an incinerator, an ammonia water container, and a waste storage cage. An accommodation notch is provided at the top of the waste liquid container, and a movable top plate is rotatably connected to the accommodation notch. The movable top plate is a ring-shaped plate structure. The waste storage cage is arranged inside the waste liquid container and its top is connected to the movable top plate and rotates together. A number of first atomizing spray guns are arranged around the outer peripheral side of the waste liquid container, and the nozzles of the first atomizing spray guns extend into the waste liquid container. A transfer pump is used to provide pressure to transport ammonia water in the ammonia water container to the first atomizing spray guns and atomize and spray it into the waste liquid container. A power device drives the movable top plate to rotate through a transmission mechanism. The bottom of the waste liquid container is connected to a second atomizing spray gun whose nozzle extends into the incinerator through a pipeline.

[0007] Preferably, the movable top plate is rotatably connected to the top of the waste liquid container through a bearing; a fixed top plate is installed at the top of the waste storage cage. A number of tooth grooves are provided on the periphery of the central hole of the movable top plate, and a number of radially extending tooth blocks are provided on the periphery of the fixed top plate. The tooth blocks and the tooth grooves cooperate with each other and correspond one by one. The fixed top plate is installed on the movable top plate through the engagement between the tooth blocks and the tooth grooves.

[0008] Preferably, the power device is a double-shaft motor fixedly installed on the peripheral side of the waste liquid container; the double-shaft motor has a first drive shaft and a second drive shaft, and the extending directions of the first drive shaft and the second drive shaft are opposite; the first drive shaft is used to drive the blades in the transfer pump, and the second drive shaft is used to drive the transmission mechanism.

[0009] Preferably, the transmission mechanism is a gear mechanism including a driving gear and a toothed ring structure. The outer side of the movable top plate is the toothed ring structure, and the driving gear and the toothed ring structure are meshed and transmitted.

[0010] Preferably, a number of first atomizing spray guns form a first spray gun array. The first spray gun array further includes a first annular pipe. The first annular pipe is fixedly sleeved outside the waste liquid container and is communicated with the liquid inlets of each first atomizing spray gun to supply liquid. The nozzle structure of the first atomizing spray gun adopts an inclined nozzle.

[0011] Preferably, there are a number of second atomizing spray guns which form a second spray gun array. The second atomizing spray guns are evenly arranged around the circumference of the incinerator. The second annular pipe is fixedly sleeved outside the incinerator and is communicated with the liquid inlets of each second atomizing spray gun to supply liquid.

[0012] Preferably, a suspension cable is provided inside the garbage storage cage, a turntable is arranged between the suspension cable and the garbage storage cage, the turntable is rotationally connected to the garbage storage cage through a bearing, the suspension cable is connected to the turntable, one end of the suspension cable is fixedly connected with a hanging ring, and the movable top plate is provided with a top plate central hole.

[0013] Preferably, a fine filter plate and a coarse filter plate are arranged at the bottom inside the waste liquid container, and the coarse filter plate is located above the fine filter plate.

[0014] The present invention also provides a use method of the leachate backspray denitration device for a garbage incinerator as described above, including the following steps:

[0015] S1 Garbage storage: Pour the garbage with waste liquid into the garbage storage cage, and use a hoisting device to suspend the garbage storage cage into the receiving slot opening;

[0016] S2 Waste liquid reaction: Drive the garbage storage cage to rotate self - sufficiently, fling out the leachate in the garbage storage cage, at the same time pump ammonia water into the first spray gun array, and make the ammonia water mix with the flung - out leachate through the inclined nozzles. The flung - out leachate will react with the sprayed ammonia water and the volatilized ammonia gas;

[0017] S3 Backspray denitration: The solution that has completed the mixing reaction enters the incinerator through the connecting pipe and the second spray gun array for high - temperature denitration.

[0018] The present invention has the following advantages:

[0019] The present invention is provided with a waste liquid container with a first spray gun array and a garbage storage cage, and an incinerator with a second spray gun array. When it is necessary to carry out backspray denitration treatment on garbage leachate, the collected garbage can be poured into the garbage storage cage, and then the entire garbage storage cage can be suspended in the waste liquid container by using a hoisting device. The garbage storage cage is driven by a power device to enter a self - rotating state, and the leachate therein will be continuously flung out. The power device synchronously drives a delivery pump to atomize and spray ammonia water into the waste liquid container evenly through the first spray gun array. The flung - out leachate and the atomized ammonia water can quickly and evenly contact, thereby improving the reaction rate of the leachate. The solution after the reaction is transported to the incinerator through the connecting pipe and the second atomizing spray gun for high - temperature denitration treatment. In addition, a fine filter plate and a coarse filter plate are arranged in the waste liquid container of the present invention, which can avoid the situation that some small garbage fragments are flung out and cause blockage of the connecting pipe. Description of the Drawings

[0020] Figure 1 It is a structural schematic diagram of a leachate backspray denitration device for a garbage incinerator according to the present invention.

[0021] Figure 2 is Figure 1 a structural schematic diagram of the shown structure from another perspective.

[0022] Figure 3 is Figure 1 A schematic internal structure diagram of the waste liquid container with the structure shown.

[0023] Figure 4 is Figure 1 A front view of the structure shown.

[0024] Figure 5 is Figure 1 A schematic structure diagram of the structure shown from another perspective.

[0025] In the figure: 1. Waste liquid container; 2. Incinerator; 3. First spray gun array; 4. Second spray gun array; 5. Garbage storage cage; 6. Fixed top plate; 7. Tooth block; 8. Accommodating notch; 9. Movable top plate; 10. Tooth groove; 11. Biaxial motor; 12. Driving gear; 13. Transfer pump; 14. Ammonia container; 15. Transfer pipe; 16. First drive shaft; 17. First annular pipe; 18. First atomizing spray gun; 19. Smoke exhaust pipe; 20. Tooth ring structure; 21. Suspension cable; 22. Suspension ring; 23. Valve; 24. Pump; 25. Connecting pipe; 26. Second annular pipe; 27. Second atomizing spray gun; 28. Fine filter plate; 29. Coarse filter plate; 30. Oblique spray head; 31. Second drive shaft. Specific embodiments

[0026] The following is a more detailed description of the specific embodiments of the present invention with reference to the accompanying drawings through the description of the embodiments, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0027] As Figures 1-5 shown, the present invention provides a denitrification device for backspraying leachate of a waste incinerator, including a waste liquid container 1, an incinerator 2, an ammonia container 14 and a garbage storage cage 5. An accommodating notch 8 is opened at the top of the waste liquid container 1, and a movable top plate 9 is rotatably connected to the accommodating notch 8. The movable top plate 9 is a ring-shaped plate structure. The garbage storage cage 5 is arranged in the waste liquid container 1 and is connected to the movable top plate 9 at the top and rotates together. A plurality of first atomizing spray guns 18 are arranged around the outer peripheral side of the waste liquid container 1, and the nozzles of the first atomizing spray guns 18 extend into the waste liquid container 1. The transfer pump 13 is used to provide pressure to transport the ammonia in the ammonia container 14 to the first atomizing spray guns 18 and atomize and spray it into the waste liquid container 1. The power device drives the movable top plate 9 to rotate through a transmission mechanism. The bottom of the waste liquid container 1 is connected to a second atomizing spray gun 27 whose nozzle extends into the incinerator 1 through a pipeline.

[0028] A number of first atomizing spray guns 18 form a first spray gun array 3. The first spray gun array 3 further includes a first annular pipe 17. The first annular pipe 17 is fixedly sleeved outside the waste liquid container 1 and is communicated with the liquid inlets of the respective first atomizing spray guns 18 for supplying liquid. The nozzle structure of the first atomizing spray gun 18 adopts an inclined nozzle 30, and the inclined nozzle 30 is located inside the waste liquid container 1.

[0029] The movable top plate 9 is rotationally connected to the top of the waste liquid container 1 through a bearing. A fixed top plate 6 is installed on the top of the garbage storage cage 5. A number of tooth grooves 10 are provided on the periphery of the central hole of the movable top plate 9. A number of radially protruding tooth blocks 7 are provided on the periphery of the fixed top plate 6. The tooth blocks 7 and the tooth grooves 10 cooperate with each other and correspond one by one. The fixed top plate 6 is installed on the movable top plate 9 through the engagement between the tooth blocks 7 and the tooth grooves 10.

[0030] The transmission mechanism is a gear mechanism including a driving gear 12 and a gear ring structure 20. The outer side of the movable top plate 9 is the gear ring structure 20, and the driving gear 12 and the gear ring structure 20 are meshed for transmission. The power device is a motor fixedly installed on the peripheral side surface of the waste liquid container 1. The motor is a double-shaft motor 11 and has a first drive shaft 16 and a second drive shaft 32. The extending directions of the first drive shaft 16 and the second drive shaft 32 are opposite; the first drive shaft 16 is used to drive the blades in the delivery pump, and the second drive shaft is used to drive the transmission mechanism.

[0031] There are a number of second atomizing spray guns 27 which form a second spray gun array 4. The second atomizing spray guns 27 further include a second annular pipe 26. The second atomizing spray guns 27 are evenly arranged around the circumference of the incinerator 2. The second annular pipe 26 is fixedly sleeved outside the incinerator 2 and is communicated with the liquid inlets of the respective second atomizing spray guns 27 for supplying liquid. The pipeline is a connecting pipe 25. One end of the connecting pipe 25 is communicated with the waste liquid container 1 and the other end is communicated with the second annular pipe 26. A pump 24 and a valve 23 are provided on the connecting pipe 25.

[0032] A sling 21 is provided inside the garbage storage cage 5. A turntable is provided between the sling 21 and the garbage storage cage 5. The turntable is rotationally connected to the garbage storage cage 5 through a bearing. The sling 21 is connected to the turntable. One end of the sling 21 is fixedly connected with a hanging ring 22. The movable top plate 9 is provided with a central hole of the top plate. In this way, the garbage storage cage 5 can be lifted by the hanging ring exposed from the central hole of the top plate. When the filtrate is drained out, the rotation of the garbage storage cage 5 is stopped, and the garbage storage cage 5 can be directly lifted to replace the garbage inside. When the garbage storage cage 5 rotates, since it can rotate relative to the turntable, the hanging ring 22 can also maintain its position and maintain the connection.

[0033] At the bottom inside the waste liquid container 1, a fine filter plate 28 and a coarse filter plate 29 are provided, and the coarse filter plate 29 is located above the fine filter plate 28. When the garbage storage cage 5 rotates, by setting the fine filter plate 28 and the coarse filter plate 29, it is possible to avoid the situation where some small garbage fragments are thrown out and cause blockage of the connecting pipe 25. The top of the ammonia water container 14 is connected with a delivery pipe 15. One end of the delivery pipe 15 away from the ammonia water container 14 is communicated with the first annular pipe 17, and a delivery pump 13 is provided on the delivery pipe 15. At the top of the incinerator 2, a smoke exhaust pipe 19 is provided.

[0034] In the present invention, by providing the waste liquid container 1 with the first spray gun array 3 and the garbage storage cage 5 and the incinerator 2 with the second spray gun array 4, when it is necessary to perform backspray denitration treatment on the garbage leachate, the collected garbage can be poured into the garbage storage cage 5, and then the entire garbage storage cage 5 is suspended inside the waste liquid container 1 by using a hoisting device. During the suspension process, the toothed ring structure 20 on the movable top plate 9 is engaged with the tooth groove 10 on the fixed top plate 6. At this time, the double-shaft motor 11 can be started to drive the delivery pump and the transmission mechanism at the same time. The transmission mechanism drives the garbage storage cage 5 to rotate through the engagement of the driving gear 12 with the toothed ring structure 20, and at the same time, the first drive shaft 16 drives the delivery pump 13 to operate, so that the ammonia water in the ammonia water container 14 can be transported into the first annular pipe 17 through the delivery pipe 15.

[0035] At this time, the first atomizing spray gun 18 sprays the ammonia water into the waste liquid container 1 through the inclined nozzle 30. Since the garbage storage bin 5 is in a self-rotating state, the leachate contained inside will be continuously thrown out. The thrown-out leachate can be fully and evenly contacted with the atomized ammonia water, so as to improve the reaction rate of the leachate. The reacted solution is transported into the incinerator 2 through the connecting pipe 15 and the second atomizing spray gun 27 for high-temperature denitration treatment. During this process, the ammonia gas volatilized into the air in the ammonia water will also be removed by the thrown-out leachate and thus absorbed and reacted. Therefore, this device can also solve the problem of ammonia gas volatilization in the upper part of the container at the same time.

[0036] The present invention also provides a use method of a garbage incinerator leachate backspray denitration device, including the following steps.

[0037] S1 Garbage storage: Pour the garbage with waste liquid into the garbage storage cage 5, and use a lifting device to suspend the garbage storage cage 5 into the accommodation notch 8.

[0038] S2 Waste liquid reaction: Drive the garbage storage cage 5 to rotate, throw out the leachate in the garbage storage cage 5, and at the same time pump the ammonia water into the first spray gun array 3, and let the ammonia water be mixed with the thrown-out leachate through the inclined nozzle 30. In this way, the thrown-out leachate will react with the sprayed ammonia water and the volatilized ammonia gas.

[0039] S3 Re-injection denitration: The solution that has completed the mixing reaction enters the incinerator 2 through the connection pipe 25 and the second spray gun array 4 for high-temperature denitration.

[0040] The present invention has been described exemplarily above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various non-substantive improvements are made by adopting the inventive concept and technical solution of the present invention, or the inventive concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A waste incinerator leachate back-spray denitrification device, characterized in that: The utility model comprises a waste liquid container, an incinerator, an ammonia water container and a garbage storage cage. A receiving slot is provided on the top of the waste liquid container, a movable top plate is rotatably connected to the receiving slot, and the movable top plate is a ring-shaped plate structure. The garbage storage cage is arranged in the waste liquid container, and the top is connected to the movable top plate and rotates together. A plurality of first atomizing spray guns are arranged around the outer peripheral side of the waste liquid container, and the nozzles of the first atomizing spray guns extend into the waste liquid container. The delivery pump is used to provide pressure to deliver the ammonia water in the ammonia water container to the first atomizing spray gun to spray it into the waste liquid container in an atomized manner. The power device drives the movable top plate to rotate through a transmission mechanism, and the bottom of the waste liquid container is connected to the second atomizing spray gun with a nozzle extending into the incinerator through a pipeline.

2. A waste incinerator leachate back-spray denitrification device according to claim 1, characterized in that: The movable top plate is rotatably connected to the top of the waste liquid container through a bearing; a fixed top plate is installed on the top of the garbage storage cage, a plurality of tooth grooves are arranged around the periphery of the center hole of the movable top plate, a plurality of radially extending tooth blocks are arranged around the periphery of the fixed top plate, the tooth blocks and the tooth grooves cooperate with each other and correspond one to one, and the fixed top plate is installed on the movable top plate through the engagement between the tooth blocks and the tooth grooves.

3. A waste incinerator leachate back-spray denitrification device according to claim 2, characterized in that: The power device is a double-shaft motor fixedly mounted on the side surface of the waste liquid container; the double-shaft motor has a first drive shaft and a second drive shaft, and the extension directions of the first drive shaft and the second drive shaft are opposite; the first drive shaft is used to drive the blades in the delivery pump, and the second drive shaft is used to drive the transmission mechanism.

4. A waste incinerator leachate back-spray denitrification device according to claim 3, characterized in that: The transmission mechanism is a gear mechanism including a driving gear and a gear ring structure. The outer side of the movable top plate is the gear ring structure. The driving gear and the gear ring structure are meshed for transmission.

5. A waste incinerator leachate back-spray denitrification device according to claim 1, characterized in that: A plurality of first atomizing spray guns form a first spray gun array, which also includes a first annular tube, which is fixedly sleeved outside the waste liquid container and connected to the liquid inlet of each first atomizing spray gun for liquid supply. The nozzle structure of the first atomizing spray gun adopts an oblique nozzle.

6. A waste incinerator leachate back-spray denitrification device according to claim 1, characterized in that: There are several second atomizing spray guns forming a second spray gun array. The second atomizing spray guns also include second annular tubes. The second atomizing spray guns are evenly arranged around the circumference of the incinerator. The second annular tube is fixedly sleeved outside the incinerator and connected to the liquid inlet of each second atomizing spray gun for liquid supply.

7. A waste incinerator leachate back-spray denitrification device according to claim 1, characterized in that: A sling is arranged inside the garbage storage cage, a turntable is arranged between the sling and the garbage storage cage, the turntable is rotatably connected with the garbage storage cage through a bearing, the sling is connected to the turntable, one end of the sling is fixedly connected with a lifting ring, and a movable top plate is provided with a top plate center hole.

8. A waste incinerator leachate back-spray denitrification device according to claim 1, characterized in that: A fine filter screen plate and a coarse filter screen plate are arranged at the bottom of the waste liquid container, and the coarse filter screen plate is located above the fine filter screen plate.

9. A method for using the waste incinerator leachate back-spray denitrification device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1 Waste storage: Pour the waste with waste liquid into the waste storage cage, and use the lifting equipment to suspend the waste storage cage into the receiving slot; S2 waste liquid reaction: driving the garbage storage cage to rotate, throwing out the leachate in the garbage storage cage, and at the same time pumping ammonia water into the first spray gun array, and mixing the ammonia water with the thrown out leachate through the oblique nozzle, the thrown out leachate will react with the sprayed ammonia water and the volatilized ammonia gas; S3 back-spray denitrification: The solution that has completed the mixed reaction enters the incinerator through the connecting pipe and the second spray gun array for high-temperature denitrification.

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