Leachate back-spraying device for household garbage incineration plant

Abstract

The utility model relates to the technical field of leachate back-spraying, and discloses a leachate back-spraying device for a household garbage incineration plant, which comprises an incinerator and a spraying pump arranged at the side part of the incinerator, the outlet end of the spraying pump is connected with a conveying pipe, the outlet end of the conveying pipe is connected with a flow dividing pipe, and the flow dividing pipe is connected with the incinerator. A plurality of spraying pipes are arranged on the side, close to the incinerator, of the flow dividing pipe and extend into a hearth of the incinerator. According to the percolate back-spraying device, the rotating water wheel, the output shaft and the cleaning rod with the bristles are integrated, the cleaning mechanism is driven through the energy of fluid, spraying holes can be continuously prevented from being blocked without external power, the spraying head is automatically closed in the non-spraying stage through the design of a normally-closed opening and closing plate, harmful smoke is effectively isolated, smoothness of the spraying holes is doubly guaranteed, and the percolate back-spraying device is convenient to use. Torque output is improved through the multi-stage impeller design, powerful cleaning is ensured, quick disassembly and maintenance are facilitated through the thread and flange connection mode, and the overall structure remarkably reduces the maintenance frequency and cleaning difficulty of the spray head.

Description

Technical Field

[0001] This utility model relates to the field of leachate recirculation technology, specifically to a leachate recirculation device for municipal solid waste incineration plants. Background Technology

[0002] As the core facility for urban solid waste treatment, municipal solid waste incineration plants inevitably produce leachate during operation. Leachate mainly comes from the moisture produced by the degradation of organic matter in the waste pile, rainwater infiltration, and moisture carried by the waste itself. Its composition is complex, containing high concentrations of organic matter, heavy metals, and salts. If it is discharged directly without proper treatment, it will cause serious pollution to the soil and groundwater.

[0003] Currently, leachate treatment methods mainly include biological treatment, membrane treatment, and evaporation concentration. However, these methods have problems such as high operating costs and difficulties in disposing of concentrated liquid. Leachate re-spraying technology sprays leachate into the incinerator after atomization, and uses high-temperature incineration to achieve the harmless treatment of pollutants. At the same time, it can regulate the furnace temperature and reduce the risk of coking, making it an important means of leachate treatment in incineration plants.

[0004] Existing back spraying devices typically consist of a collection tank, a filter pump, a clear liquid tank, a spray pump, and an atomizing spray gun. However, in current back spraying devices, the spray gun usually needs to be installed inside the furnace. Therefore, during application, the smoke and dust generated from burning waste can easily adhere to the nozzle and clog the nozzle holes, causing the nozzle to malfunction. Currently, the nozzle needs to be disassembled for cleaning, and maintenance is very cumbersome. In view of this, this case was developed through in-depth research into the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a leachate recirculation device for municipal solid waste incineration plants, which solves the existing technical problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a leachate return spraying device for a municipal solid waste incineration plant, comprising an incinerator and a spray pump disposed on the side of the incinerator, wherein the outlet end of the spray pump is connected to a conveying pipe, the outlet end of the conveying pipe is connected to a diversion pipe, and a plurality of spray pipes are disposed on the side of the diversion pipe near the incinerator, the plurality of spray pipes extending into the furnace chamber of the incinerator.

[0007] The end of the spray pipe is connected to a spray assembly, which includes a spray head. The spray head is threadedly connected to the spray pipe. The spray head has a plurality of spray holes evenly distributed. A rotating water wheel is installed inside the spray head. An output shaft is connected to the center of the rotating water wheel. The end of the output shaft passes through the end of the spray head. A cleaning rod is connected to the end of the output shaft. Bristles are evenly arranged on the cleaning rod to clean the spray holes.

[0008] The spray assembly also includes a pair of hinged plates, which are hinged to the sweeping bar by a pair of torsion springs.

[0009] Preferably, the cleaning rod is a rectangular plate, the spray head has a central shaft hole, a shaft seat is embedded in the shaft hole, and the output shaft is fixedly mounted on the shaft seat.

[0010] Preferably, the rotating water turbine is a multi-stage impeller, and the impeller diameter of the multi-stage rotating water turbine increases progressively along the direction of liquid flow injection.

[0011] Preferably, the pair of opening and closing plates has a semi-circular structure, and the pair of opening and closing plates are symmetrically hinged on both sides of the sweeping rod and close the end face of the spray head.

[0012] Preferably, the diversion pipe has several connectors evenly distributed on it, and the connectors are connected to the spray pipe via flanges.

[0013] Preferably, a sealing plate is provided on the outside of the spray pipe, and the sealing plate is closed on the outside of the furnace wall of the incinerator.

[0014] This invention provides a leachate return spraying device for municipal solid waste incineration plants. It offers the following advantages: This leachate return spraying device integrates a rotating water wheel, output shaft, and a brush-equipped cleaning rod to achieve online self-cleaning of the spray heads. Utilizing the fluid's own energy to drive the cleaning mechanism, it continuously prevents nozzle clogging without external power. The normally closed opening and closing plate design automatically seals the nozzles during non-spraying phases, effectively isolating harmful fumes and providing double protection for unobstructed nozzle flow. The multi-stage impeller design enhances torque output, ensuring powerful cleaning. The threaded and flanged connections facilitate quick disassembly and maintenance. The overall structure significantly reduces the maintenance frequency and cleaning difficulty of the nozzles, improving the operational reliability and efficiency of the return spraying system. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a leachate recirculation device for a municipal solid waste incineration plant, as described in this utility model.

[0016] Figure 2 This is a partial isometric structural diagram of a leachate recirculation device for a municipal solid waste incineration plant according to the present invention.

[0017] Figure 3 This is a partial cross-sectional view of the leachate recirculation device for a municipal solid waste incineration plant according to the present invention.

[0018] In the diagram: 1. Incinerator; 2. Spray pump; 3. Delivery pipe; 4. Diversion pipe; 5. Spray pipe; 6. Spray assembly; 7. Connector; 8. Sealing plate; 61. Spray head; 62. Spray hole; 63. Rotating water wheel; 64. Output shaft; 65. Cleaning rod; 66. Brush; 67. Opening and closing plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Because the spray guns in current back-spraying devices are usually installed inside the furnace, the smoke and dust generated during the incineration of waste can easily adhere to the nozzles and clog the nozzle holes, causing the nozzles to malfunction. Currently, the nozzles need to be disassembled for cleaning, making maintenance very cumbersome.

[0021] To solve the above technical problems, please refer to Figure 1-3 This application discloses a leachate recirculation device for a municipal solid waste incineration plant, including an incinerator 1 and a spray pump 2 located on the side of the incinerator 1 to provide conveying power. The outlet end of the spray pump 2 is connected to a conveying pipe 3 to convey leachate. The outlet end of the conveying pipe 3 is connected to a diversion pipe 4 to distribute fluid. Several connectors 7 are evenly distributed on the diversion pipe 4. The connectors 7 are connected to the spray pipes 5 through flanges to ensure sealing and facilitate disassembly and maintenance. Several spray pipes 5 are provided on the side of the diversion pipe 4. Several spray pipes 5 extend into the furnace of the incinerator 1 to perform recirculation operation.

[0022] The end of the spray pipe 5 is connected to a spray assembly 6 to perform the core spraying and self-cleaning functions. The spray assembly 6 includes a spray head 61, which is threaded to the spray pipe 5 for easy replacement. Several spray holes 62 are evenly distributed on the spray head 61 to form atomized spray. A rotating water wheel 63 is installed inside the spray head 61 to convert the fluid kinetic energy into mechanical energy. The rotating water wheel 63 is a multi-stage impeller design, and its wheel diameter increases step by step along the liquid flow spray direction to effectively improve torque output.

[0023] The rotating water wheel 63 is connected to the center of an output shaft 64 to transmit rotational power. The spray head 61 has a shaft hole in the center, and a shaft seat is embedded in the shaft hole to provide stable support. The output shaft 64 is mounted on the shaft seat to ensure concentric rotation. The end of the output shaft 64 passes through the end of the spray head 61. The end of the output shaft 64 is connected to a cleaning rod 65. The cleaning rod 65 provides an installation base for the rectangular structure plate. The cleaning rod 65 has bristles 66 evenly arranged on it to rotate and clean the spray holes 62 to prevent clogging.

[0024] As a preferred option, the spray assembly 6 further includes a pair of opening and closing plates 67 to achieve bidirectional protection of the spray holes 62. The pair of opening and closing plates 67 are semi-circular in structure and are symmetrically hinged to both sides of the cleaning rod 65 by a pair of torsion springs. In the non-spraying state, the torsion springs automatically close to seal the end face of the spray head 61 to prevent furnace flue gas from entering. In the spraying state, the liquid flow pressure opens the spray head for spraying.

[0025] As a preferred option, the spray pipe 5 is further provided with a sealing plate 8 on its exterior. The sealing plate 8 is closed off outside the furnace wall of the incinerator 1 to ensure the furnace wall is airtight and to protect the spray pipe 5.

[0026] Working process: After the spray pump 2 starts, the leachate is pumped into the diversion pipe 4 through the delivery pipe 3, and then delivered to the spray assembly 6 through each spray pipe 5. When the high-pressure liquid flow enters the spray head 61, it first impacts the multi-stage impeller of the rotating water wheel 63, driving it to rotate at high speed. The rotating water wheel 63 transmits the rotational motion to the cleaning rod 65 outside the spray head 61 through the output shaft 64, causing it to rotate synchronously. The bristles 66 on the cleaning rod 65 then continuously rotate and scrape the area around the spray hole 62 outlet. To prevent oil stains from adhering, the liquid pressure forces open a pair of normally closed opening and closing plates 67 under the action of torsion springs, and atomizes the liquid and sprays it into the furnace through the spray hole 62. When the spraying ends, the liquid pressure disappears, and the opening and closing plates 67 automatically reset and close under the action of torsion springs, tightly covering the end face of the spray head 61, effectively isolating the flue gas and impurities in the furnace and preventing them from entering the spray hole 62 and causing blockage. When maintenance is required, the spray pipe 5 can be easily disassembled through the flange, or the spray head 61 can be directly unscrewed for cleaning or replacement.

[0027] This leachate return spray device integrates a rotating water wheel 63, an output shaft 64, and a cleaning rod 65 with bristles 66 to achieve online self-cleaning of the spray head 61. It utilizes the fluid's own energy to drive the cleaning mechanism, continuously preventing nozzle clogging without external power. The normally closed opening and closing plate 67 automatically closes the nozzle during non-spraying phases, effectively isolating harmful fumes and providing double protection for unobstructed nozzle flow. The multi-stage impeller design enhances torque output, ensuring powerful cleaning. The threaded and flanged connections facilitate quick disassembly and maintenance. The overall structure significantly reduces the maintenance frequency and cleaning difficulty of the nozzle, improving the operational reliability and efficiency of the return spray system.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leachate recirculation device for a municipal solid waste incineration plant, comprising an incinerator (1) and a spray pump (2) disposed on the side of the incinerator (1), wherein the outlet end of the spray pump (2) is connected to a conveying pipe (3), characterized in that, The outlet end of the conveying pipe (3) is connected to a diversion pipe (4), and a number of spray pipes (5) are provided on the side of the diversion pipe (4) near the incinerator (1), and the number of spray pipes (5) extends into the furnace of the incinerator (1). The end of the spray pipe (5) is connected to a spray assembly (6), the spray assembly (6) includes a spray head (61), the spray head (61) is threadedly connected to the spray pipe (5), the spray head (61) has a plurality of spray holes (62) evenly distributed on it, a rotating water wheel (63) is provided inside the spray head (61), an output shaft (64) is connected to the center of the rotating water wheel (63), the end of the output shaft (64) passes through the end of the spray head (61), a cleaning rod (65) is connected to the end of the output shaft (64), and bristles (66) are evenly arranged on the cleaning rod (65) for cleaning the spray holes (62); The spray assembly (6) also includes a pair of hinge plates (67), which are hinged to the sweeping bar (65) by a pair of torsion springs.

2. The leachate recirculation device for a municipal solid waste incineration plant according to claim 1, characterized in that, The cleaning rod (65) is a rectangular plate, the spray head (61) has a shaft hole in the center, a shaft seat is embedded in the shaft hole, and the output shaft (64) is fixedly mounted on the shaft seat.

3. A leachate recirculation device for a municipal solid waste incineration plant according to claim 2, characterized in that, The rotating water turbine (63) is a multi-stage impeller, and the impeller diameter of the multi-stage rotating water turbine (63) increases gradually along the direction of liquid flow injection.

4. A leachate recirculation device for a municipal solid waste incineration plant according to claim 3, characterized in that, The pair of opening and closing plates (67) are semi-circular structures. The pair of opening and closing plates (67) are symmetrically hinged on both sides of the cleaning rod (65) and close the end face of the spray head (61).

5. A leachate recirculation device for a municipal solid waste incineration plant according to claim 4, characterized in that, The diversion pipe (4) has several connectors (7) evenly distributed on it, and the connectors (7) are connected to the spray pipe (5) through flanges.

6. A leachate recirculation device for a municipal solid waste incineration plant according to claim 5, characterized in that, The spray pipe (5) is provided with a sealing plate (8) on the outside, and the sealing plate (8) is closed outside the furnace wall of the incinerator (1).

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