A concentrated liquid back spraying furnace system for a waste incineration power plant

Abstract

The utility model discloses a kind of concentrated liquid back spray furnace systems for garbage incineration power plant, including incinerator and concentrated liquid feeding and discharging device, the concentrated liquid feeding and discharging device includes back spray gun, back spray gun sleeve and telescopic driving part, the back spray gun sleeve is through setting in the furnace wall of incinerator, the back spray gun is located in back spray gun sleeve, the telescopic driving part is used to drive back spray gun to extend or exit incinerator, back spray gun sleeve is also provided with check valve, the check valve is used to close back spray gun sleeve when back spray gun exits incinerator.The utility model has the advantages of simple structure, reliable, stable operation, good safety and long service life.

Description

Technical Field

[0001] This utility model relates to the technical field of waste incineration power plant equipment, and in particular to a concentrated liquid re-injection furnace system for waste incineration power plants. Background Technology

[0002] During the fermentation process of domestic waste in the waste pit, the moisture content of the waste is about 20% (called leachate). The leachate produces 300 tons of concentrated liquid per day. After treatment (called concentrated liquid), the leachate is injected back into the boiler furnace through the concentrated liquid return system to cool the furnace and consume the concentrated liquid to achieve the goal of zero emissions.

[0003] The waste incineration industry uses reciprocating grate furnaces, which are divided into drying, combustion, and burnout sections. The upper part of the combustion section needs to maintain a stable temperature between 850℃ and 950℃ to treat dioxins. However, due to the unstable calorific value of waste, the flue gas temperature generally exceeds 1000℃, severely impacting the high-temperature corrosion of the rear water-cooled wall tubes. Currently, concentrated liquid is typically injected back into the furnace through concentrated liquid return spray guns for cooling. However, existing concentrated liquid return spray guns are fixed inside the furnace, remaining there even when not in use, which can easily cause damage over time. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a concentrated liquid re-injection furnace system for waste incineration power plants that is simple in structure, reliable, stable in operation, safe, and has a long service life.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A concentrated liquid re-injection system for a waste incineration power plant includes an incinerator and a concentrated liquid injection / retraction device. The concentrated liquid injection / retraction device includes a re-injection gun, a re-injection gun sleeve, and a telescopic drive. The re-injection gun sleeve is installed through the furnace wall of the incinerator, and the re-injection gun is located inside the re-injection gun sleeve. The telescopic drive is used to drive the re-injection gun to extend into or retract from the incinerator. A check valve is also provided inside the re-injection gun sleeve, which is used to close the re-injection gun sleeve when the re-injection gun retracts from the incinerator.

[0006] As a further improvement to the above technical solution: The check valve is located on the outside of the furnace wall of the incinerator. The return spray gun sleeve is provided with a vent hole, which is located between the furnace wall of the incinerator and the check valve. The vent hole is connected to a sealed air duct.

[0007] The check valve includes a valve cavity and a valve plate disposed in the valve cavity. The valve plate is rotatably connected to the top of the valve cavity, and the bottom of the valve cavity is provided with an abutment portion. When the valve plate hangs down naturally under the action of gravity, the valve plate abuts against the abutment portion.

[0008] The bottom of the valve chamber is also provided with an arc-shaped avoidance part for the valve plate to avoid when it swings.

[0009] It also includes a concentrate assembly and a cleaning water assembly, which are connected to the return spray gun via a connecting pipe.

[0010] The concentrate assembly includes a concentrate pipe, the inlet end of which is connected to a concentrate supply unit and the outlet end of which is connected to a return spray gun. A first manual valve, a flow meter, and a first electric valve are sequentially arranged on the concentrate pipe along the concentrate flow direction.

[0011] The cleaning water assembly includes a cleaning water pipe, the inlet end of which is connected to a cleaning water supply unit and the outlet end of which is connected to a return spray gun. A second manual valve and a second electric valve are sequentially provided on the cleaning water pipe along the direction of cleaning water flow.

[0012] The front end of the back spray gun is provided with two nozzles, one of which has its outlet facing upwards and the other has its outlet facing downwards.

[0013] The angle between the outlet of each of the two nozzles and the horizontal plane is 45°.

[0014] The telescopic drive component is a pneumatic drive component.

[0015] Compared with the prior art, the advantages of this utility model are: 1. The concentrate re-injection system for waste incineration power plants of this utility model uses a telescopic drive to drive the re-injection gun to extend into or retract from the incinerator. When injection is not required, the re-injection gun can be withdrawn from the incinerator, preventing it from remaining in the incinerator for a long time and causing damage, thus extending its service life. After the re-injection gun is withdrawn from the incinerator, the check valve can automatically close the channel inside the re-injection gun sleeve, preventing the high-temperature flue gas inside the incinerator from escaping, ensuring good safety. Furthermore, the re-injection gun moves telescopically within the re-injection gun sleeve throughout the entire process, resulting in a simple, reliable, and stable structure.

[0016] 2. The concentrate return injection system of this utility model for waste incineration power plants, when the return injection gun is inserted into the incinerator, the check valve opens, and the sealing air duct can blow sealing air into the return injection gun sleeve to form an air curtain, preventing the high-temperature flue gas in the incinerator from overflowing from the gap between the return injection gun and the return injection gun sleeve.

[0017] 3. The concentrate return injection system of this utility model for waste incineration power plants can open the check valve by pushing the valve plate to rotate and swing when the return injection gun is inserted into the incinerator; when the return injection gun is withdrawn from the incinerator, the valve plate can naturally droop under the action of gravity and abut against the bottom of the valve cavity to close the check valve. The structure is simple and reliable.

[0018] 4. The concentrate re-injection furnace system of this utility model for waste incineration power plants has an arc-shaped movement trajectory at the front end of the valve plate when it rotates and swings. By setting an arc-shaped avoidance part, it is possible to prevent the valve plate from colliding with the bottom of the valve cavity when it rotates and swings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the concentrate re-injection furnace system used in a waste incineration power plant according to this utility model.

[0020] Figure 2 This is a schematic diagram of the check valve in the concentrate return furnace system of a waste incineration power plant, which is a product of this invention.

[0021] Figure 3 This is a schematic diagram of the structure of the return spray gun in the concentrate return spray furnace system of a waste incineration power plant, which is based on the present invention.

[0022] Legend: 1. Incinerator; 2. Concentrate dosing / returning device; 21. Return spray gun; 211. Nozzle; 22. Return spray gun sleeve; 23. Telescopic drive component; 24. Check valve; 241. Valve chamber; 242. Valve plate; 243. Abutment part; 244. Arc-shaped clearance part; 25. Sealed air duct; 4. Concentrate assembly; 41. Concentrate pipe; 42. First manual valve; 43. Flow meter; 44. First electric valve; 5. Cleaning water assembly; 51. Cleaning water pipe; 52. Second manual valve; 53. Second electric valve; 6. Connecting pipe. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] like Figures 1 to 3 As shown, the concentrate re-injection furnace system for a waste incineration power plant in this embodiment includes an incinerator 1 and a concentrate injection / retraction device 2. The concentrate injection / retraction device 2 includes a re-injection gun 21, a re-injection gun sleeve 22, and a telescopic drive 23. The re-injection gun sleeve 22 is installed through the furnace wall of the incinerator 1. The re-injection gun 21 is located inside the re-injection gun sleeve 22. The telescopic drive 23 is used to drive the re-injection gun 21 to extend into or retract from the incinerator 1. A check valve 24 is also provided inside the re-injection gun sleeve 22. The check valve 24 is used to close the re-injection gun sleeve 22 when the re-injection gun 21 retracts from the incinerator 1.

[0028] In this embodiment, the concentrated liquid re-spraying system for a waste incineration power plant operates as follows: when concentrated liquid injection is not required, the telescopic drive 23 drives the re-spraying gun 21 to move outward along the re-spraying gun sleeve 22 and exit the incinerator 1, while the check valve 24 closes the re-spraying gun sleeve 22; when concentrated liquid injection is required, the telescopic drive 23 drives the re-spraying gun 21 to move inward along the re-spraying gun sleeve 22 and extend into the incinerator 1 to inject concentrated liquid. The concentrate re-injection system for waste incineration power plants in this embodiment uses a telescopic drive 23 to drive the re-injection gun 21 to extend into or retract from the incinerator 1. When injection is not required, the re-injection gun 21 can retract from the incinerator 1, preventing it from remaining in the incinerator 1 for a long time and causing damage, thus extending its service life. After the re-injection gun 21 retracts from the incinerator 1, the check valve 24 can automatically close the channel in the re-injection gun sleeve 22, preventing the high-temperature flue gas in the incinerator 1 from escaping, ensuring good safety. Furthermore, the re-injection gun 21 moves telescopically within the re-injection gun sleeve 22 throughout the entire process, resulting in a simple, reliable, and stable structure.

[0029] Furthermore, in this embodiment, the check valve 24 is located on the outer side of the furnace wall of the incinerator 1, and the return spray gun sleeve 22 is provided with a vent hole located between the furnace wall of the incinerator 1 and the check valve 24. The vent hole is connected to a sealed air duct 25. When the return spray gun 21 is inserted into the incinerator 1, the check valve 24 opens, and the sealed air duct 25 can blow sealed air into the return spray gun sleeve 22 to form an air curtain, preventing the high-temperature flue gas in the incinerator 1 from overflowing from the gap between the return spray gun 21 and the return spray gun sleeve 22.

[0030] Furthermore, in this embodiment, the check valve 24 includes a valve cavity 241 and a valve plate 242 disposed within the valve cavity 241. The valve plate 242 is rotatably connected to the top of the valve cavity 241, and the bottom of the valve cavity 241 is provided with an abutment portion 243. When the valve plate 242 hangs down naturally under the action of gravity, the valve plate 242 abuts against the abutment portion 243. When the return spray gun 21 extends into the incinerator 1, the return spray gun 21 can push the valve plate 242 to rotate and swing, thereby opening the check valve 24. When the return spray gun 21 withdraws from the incinerator 1, the valve plate 242 can hang down naturally under the action of gravity and abut against the abutment portion 243 at the bottom of the valve cavity 241, thereby closing the check valve 24. The structure is simple and reliable.

[0031] Preferably, in this embodiment, when the valve plate 242 abuts against the abutting part 243, the valve plate 242 is drooping at approximately 90° (e.g., 85°) under the action of gravity, rather than drooping completely at 90°, which can prevent the valve plate 242 from overturning, and the valve plate 242 has a partial horizontal component force in the horizontal direction, making the abutting between the valve plate 242 and the abutting part 243 more reliable.

[0032] Furthermore, in this embodiment, the bottom of the valve cavity 241 is also provided with an arc-shaped avoidance part 244 for the valve plate 242 to avoid collision when it swings. Since the movement trajectory of the front end of the valve plate 242 is arc-shaped when it rotates and swings, by providing the arc-shaped avoidance part 244, it is possible to prevent the valve plate 242 from colliding with the bottom of the valve cavity 241 when it rotates and swings.

[0033] Furthermore, this embodiment also includes a concentrate component 4 and a cleaning water component 5, which are connected to the return spray gun 21 via a connecting pipe 6. When the return spray gun 21 is spraying, the concentrate component 4 is connected to the return spray gun 21 to supply concentrate; before the return spray gun 21 exits the incinerator 1, the cleaning water component 5 is connected to the return spray gun 21, and the cleaning water cleans the return spray gun 21 to prevent scale formation from the concentrate remaining in the return spray gun 21 when it stops spraying.

[0034] Furthermore, in this embodiment, the concentrate assembly 4 includes a concentrate pipe 41, the inlet end of which is connected to a concentrate supply unit (not shown in the figure), and the outlet end of which is connected to a return spray gun 21. A first manual valve 42, a flow meter 43, and a first electric valve 44 are sequentially provided on the concentrate pipe 41 along the concentrate flow direction.

[0035] Furthermore, in this embodiment, the cleaning water assembly 5 includes a cleaning water pipe 51. The inlet end of the cleaning water pipe 51 is connected to the cleaning water supply unit (not shown in the figure), and the outlet end is connected to the return spray gun 21. A second manual valve 52 and a second electric valve 53 are sequentially provided on the cleaning water pipe 51 along the direction of cleaning water flow.

[0036] Preferably, in this embodiment, the first manual valve 42 and the second manual valve 52 are normally open and are closed during maintenance and other operating conditions. The incinerator 1 is equipped with an operating condition monitoring sensor module, which is connected to the telescopic drive component 23, the first electric valve 44, and the second electric valve 53. The operating condition monitoring sensor module includes a furnace temperature sensor, a boiler load sensor, a flue gas analyzer, and a furnace negative pressure sensor. Through the monitoring data of the operating condition monitoring sensor module, the opening and closing of the telescopic drive component 23, the first electric valve 44, and the second electric valve 53 can be automatically controlled to realize the automatic addition and withdrawal of concentrated liquid, with a high degree of automation.

[0037] Furthermore, in this embodiment, the front end of the back spray gun 21 is provided with two nozzles 212, one nozzle 212 with its outlet facing upwards and the other nozzle 212 with its outlet facing downwards, and the angle between the outlets of both nozzles 212 and the horizontal plane is 45°. By spraying upwards and downwards through the two nozzles 212 respectively, the spray coverage area is wider.

[0038] Furthermore, in this embodiment, the telescopic drive component 23 is a pneumatic drive component. Pneumatic drive components have a simple structure, fast response speed, and can achieve rapid extension and retraction of the return spray gun 21.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A concentrated liquid re-injection furnace system for waste incineration power plants, characterized in that: The device includes an incinerator (1) and a concentrate injection / retraction device (2). The concentrate injection / retraction device (2) includes a return spray gun (21), a return spray gun sleeve (22), and a telescopic drive (23). The return spray gun sleeve (22) is installed through the furnace wall of the incinerator (1). The return spray gun (21) is located inside the return spray gun sleeve (22). The telescopic drive (23) is used to drive the return spray gun (21) to extend into or retract from the incinerator (1). A check valve (24) is also provided inside the return spray gun sleeve (22). The check valve (24) is used to close the return spray gun sleeve (22) when the return spray gun (21) retracts from the incinerator (1).

2. The concentrated liquid re-injection furnace system for waste incineration power plants according to claim 1, characterized in that: The check valve (24) is located on the outside of the furnace wall of the incinerator (1). The return spray gun sleeve (22) is provided with a vent hole. The vent hole is located between the furnace wall of the incinerator (1) and the check valve (24). The vent hole is connected to a sealed air duct (25).

3. The concentrated liquid re-injection furnace system for waste incineration power plants according to claim 1, characterized in that: The check valve (24) includes a valve chamber (241) and a valve plate (242) disposed in the valve chamber (241). The valve plate (242) is rotatably connected to the top of the valve chamber (241). The bottom of the valve chamber (241) is provided with an abutment part (243). When the valve plate (242) hangs down naturally under the action of gravity, the valve plate (242) abuts against the abutment part (243).

4. The concentrated liquid re-injection furnace system for waste incineration power plants according to claim 3, characterized in that: The bottom of the valve chamber (241) is also provided with an arc-shaped avoidance part (244) for the valve plate (242) to avoid when swinging.

5. The concentrated liquid re-injection furnace system for waste incineration power plants according to claim 1, characterized in that: It also includes a concentrate assembly (4) and a cleaning water assembly (5), which are connected to the return spray gun (21) via a connecting pipe (6).

6. The concentrated liquid re-injection furnace system for waste incineration power plants according to claim 5, characterized in that: The concentrate assembly (4) includes a concentrate pipe (41), the inlet end of which is connected to a concentrate supply unit and the outlet end of which is connected to a return spray gun (21). A first manual valve (42), a flow meter (43) and a first electric valve (44) are sequentially provided on the concentrate pipe (41) along the concentrate flow direction.

7. The concentrated liquid re-injection furnace system for waste incineration power plants according to claim 5, characterized in that: The cleaning water assembly (5) includes a cleaning water pipe (51), the inlet end of which is connected to a cleaning water supply unit and the outlet end of which is connected to a return spray gun (21). A second manual valve (52) and a second electric valve (53) are sequentially provided on the cleaning water pipe (51) along the direction of cleaning water flow.

8. The concentrated liquid re-injection furnace system for waste incineration power plants according to claim 1, characterized in that: The front end of the back spray gun (21) is provided with two nozzles (211), one of which has its outlet facing upward and the other has its outlet facing downward.

9. The concentrated liquor re-injection furnace system for waste incineration power plants according to claim 8, characterized in that: The outlets of both nozzles (211) are at an angle of 45° to the horizontal plane.

10. The concentrate re-injection furnace system for a waste incineration power plant according to any one of claims 1 to 9, characterized in that: The telescopic drive component (23) is a pneumatic drive component.

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