A concentrated liquid back-spraying device suitable for waste incineration power plants

Abstract

The utility model discloses a concentrated liquid back-spray device suitable for a waste incineration power plant, comprising: a spray gun, an air inlet pipe and a connecting flange; the spray gun comprises a liquid inlet pipe, an elbow joint and a nozzle, the outlet of the liquid inlet pipe is connected to the nozzle through the elbow joint, and the inlet of the liquid inlet pipe is connected to the concentrated liquid booster pump through a double-threaded screw pipe; when the elbow joint and the nozzle are extended into the furnace of the waste incinerator, the opening of the nozzle is tilted downward to achieve the concentrated liquid spraying toward the bottom of the incinerator; the air inlet pipe is nested and fixed on the outside of the liquid inlet pipe, one end of the air inlet pipe close to the double-threaded screw pipe is closed and the other end close to the nozzle is open, an air inlet is provided on the circumferential surface of the air inlet pipe, and the connecting flange is sleeved outside the air inlet pipe to fix the concentrated liquid back-spray device on the incinerator. The utility model has the advantages of compact structure, convenient use, stable concentrated liquid atomization effect and low cost, and solves the problem in the prior art that the concentrated liquid is sprayed onto the inner wall of the furnace chamber due to unstable pressure at the spray gun mouth.

Description

Technical Field

[0001] The utility model belongs to the technical field of garbage incineration treatment, and in particular relates to a concentrated liquid back-spraying device suitable for a garbage incineration power plant. Background Art

[0002] The waste incinerator uses a reciprocating grate furnace, which is divided into a drying section, a combustion section, and a burnout section. The temperature of the upper part of the combustion section needs to be stabilized between 850°C and 950°C to stably operate and treat dioxins. Due to the instability of the calorific value of the waste, the flue gas temperature basically exceeds 1000°C, which seriously accelerates the high-temperature corrosion of the water-cooled wall tubes between the first channel and the second channel.

[0003] During the fermentation period of domestic garbage in the garbage pit, the moisture content of the garbage is about 20% (called leachate). After treatment, the leachate (called concentrate) enters the incinerator furnace through the concentrate back-spray system to cool the furnace and extend the service life of the incinerator. At the same time, the concentrate can also be consumed to achieve the goal of zero emissions.

[0004] The concentrated liquid is sprayed out and atomized at a certain pressure by using the concentrated liquid back-spray device, and evaporates with the flue gas in the furnace and reduces the flue gas temperature. The nozzles of the existing concentrated liquid back-spray devices mostly adopt a linear nozzle. When the nozzle pressure is unstable, the sprayed concentrated liquid will spray onto the opposite wall, which not only affects the flue gas cooling effect, but also causes the concentrated liquid to coke on the furnace wall. Utility Model Content

[0005] The technical problem to be solved by the utility model is to solve the problem caused by unstable leachate injection, and to provide a concentrated liquid back-spray device suitable for waste incineration power plants, which has a compact structure, is easy to use, has a stable concentrated liquid atomization effect and is low in cost.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A concentrated liquid back-spray device suitable for a waste incineration power plant comprises: a spray gun, an air inlet pipe and a connecting flange; the spray gun comprises a liquid inlet pipe, an elbow joint and a nozzle, the outlet of the liquid inlet pipe is connected to the nozzle via the elbow joint, and the inlet of the liquid inlet pipe is connected to a concentrated liquid booster pump via a double-threaded screw pipe; when the elbow joint and the nozzle are extended into the furnace of a waste incinerator, the opening of the nozzle is tilted downward to achieve concentrated liquid spraying toward the bottom of the incinerator; the air inlet pipe is nested and fixed on the outside of the liquid inlet pipe, one end of the air inlet pipe close to the double-threaded screw pipe is closed and the other end close to the nozzle is open, an air inlet is provided on the circumferential surface of the air inlet pipe, and the connecting flange is sleeved on the outside of the air inlet pipe to fix the concentrated liquid back-spray device on the waste incinerator.

[0008] As a further improvement of the utility model, the bending angle β of the elbow joint is 30° to 45°.

[0009] As a further improvement of the utility model, the two ends of the elbow joint are respectively provided with external threads and internal threads, the elbow joint is connected to the outlet thread of the liquid inlet pipe through the external thread, and the elbow joint is connected to the inlet thread of the nozzle through the internal thread.

[0010] As a further improvement of the utility model, a positioning plate is sleeved on the outer side of the liquid inlet pipe, and the positioning plate is close to the inlet of the liquid inlet pipe. The positioning plate is used to achieve end sealing of the air inlet pipe.

[0011] As a further improvement of the utility model, an annular groove is provided on the outside of the liquid inlet pipe, and the annular groove is close to the positioning plate; screw holes are provided on the circumferential surface of the air inlet pipe, and the fastening screws are screwed into the screw holes and the annular grooves to lock the liquid inlet pipe and the air inlet pipe.

[0012] As a further improvement of the present invention, a plurality of guide blocks are evenly distributed on the outside of the liquid inlet pipe, the guide blocks are close to the outlet of the liquid inlet pipe, and the guide blocks are used to support the air inlet pipe.

[0013] As a further improvement of the utility model, the nozzle comprises a conical head and an oblate notch opened on the end surface of the small diameter end of the conical head, and the oblate notch constitutes the nozzle.

[0014] As a further improvement of the utility model, the diameter of the outward end of the oblate notch is L1, and the diameter of the inward end is L2, and L1>L2.

[0015] As a further improvement of the present invention, the liquid inlet pipe and the air inlet pipe are coaxial.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The utility model is suitable for the concentrated liquid back-spraying device of the waste incineration power plant. The inlet of the liquid inlet pipe is connected to the concentrated liquid booster pump through a double-headed screw pipe. The pressurized high-pressure concentrated liquid directly enters the liquid inlet pipe and is sprayed out from the nozzle in the form of mist. The coverage area is large and the spraying distance is long, which has a relatively good treatment effect. In particular, the high requirements for the back-spraying effect of the leachate or concentrated liquid of a large-scale domestic waste incinerator can be properly solved, and the concentrated liquid can be better treated under the premise of ensuring the working condition of the domestic waste incinerator; at the same time, an elbow joint is arranged between the outlet of the liquid inlet pipe and the nozzle, and the elbow joint is used to realize the downward tilting of the nozzle opening. When the elbow joint and the nozzle are extended into the furnace of the waste incinerator, the concentrated liquid is sprayed toward the bottom of the incinerator, and the high-temperature flue gas generated by the incineration is diffused toward the top of the incinerator, so that the concentrated liquid and the high-temperature flue gas are contacted in reverse flow inside the incinerator, which is more conducive to the contact and heat exchange between the concentrated liquid and the high-temperature flue gas, and the flue gas cooling effect is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structural principle of a concentrated liquid back-spraying device suitable for a waste incineration power plant in a specific embodiment of the utility model.

[0019] Figure 2 It is a schematic diagram of the structural principle of the air inlet sleeve in a specific embodiment of the utility model.

[0020] Figure 3 It is a schematic diagram of the structural principle of a spray gun in a specific embodiment of the utility model.

[0021] Figure 4 It is a schematic diagram of the connection structure principle of the spray assembly in a specific embodiment of the utility model.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure principle of the elbow joint in a specific embodiment of the utility model.

[0023] Figure 6 It is a schematic diagram of the structural principle of the nozzle in a specific embodiment of the utility model, wherein Figure (a) is a schematic diagram of the cross-sectional structural principle of the nozzle, and Figure (b) is a view in the direction of A in Figure (a).

[0024] Legend: 1. Liquid inlet pipe; 2. Elbow joint; 21. External thread; 22. Internal thread; 3. Nozzle; 31. Connecting thread; 32. Conical head; 33. Oval notch; 4. Positioning plate; 5. Double-thread screw; 6. Air inlet pipe; 7. Air inlet; 8. Connecting flange; 9. Fastening screw; 10. Screw hole; 11. Guide block; 12. Annular groove. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0026] Example

[0027] like Figures 1 to 6 As shown, the concentrated liquid back-spraying device suitable for a waste incineration power plant of the utility model comprises: a spray gun, an air inlet pipe 6 and a connecting flange 8. The spray gun comprises a liquid inlet pipe 1, an elbow joint 2 and a nozzle 3, the outlet of the liquid inlet pipe 1 is connected to the nozzle 3 through the elbow joint 2, and the inlet of the liquid inlet pipe 1 is connected to the concentrated liquid booster pump through the double-threaded spiral tube 5. In this embodiment, the bending angle β of the elbow joint 2 is 30° to 45°. When the elbow joint 2 and the nozzle 3 extend into the furnace of the waste incinerator, the opening of the nozzle 3 is tilted downward to realize the concentrated liquid spraying toward the bottom of the incinerator. The air inlet pipe 6 is nested and fixed on the outside of the liquid inlet pipe 1, the end of the air inlet pipe 6 close to the double-threaded spiral tube 5 is closed and the end close to the nozzle 3 is open, an air inlet 7 is provided on the circumferential surface of the air inlet pipe 6, and the connecting flange 8 is sleeved on the outside of the air inlet pipe 6 to fix the concentrated liquid back-spraying device on the waste incinerator.

[0028] The concentrated liquid back-spray device of this embodiment is made of 316L stainless steel, which is more corrosion-resistant. When the concentrated liquid back-spray device is in use, the liquid inlet pipe 1 is inserted into the garbage incinerator by one end of the nozzle 3, and the concentrated liquid back-spray device is fixed on the furnace body of the garbage incinerator through the connecting flange 8. The concentrated liquid enters the liquid inlet pipe 1 through the double-headed screw pipe 5, and is transported to the nozzle 3 by the liquid inlet pipe 1 for atomization, and the concentrated liquid is back-sprayed into the domestic garbage incinerator for combustion. At the same time, compressed air enters the air inlet pipe 6 through the air inlet 7 to cool the liquid inlet pipe 1 in the garbage incineration furnace, which can protect the connecting pipe of the concentrated liquid back-spray device and the domestic garbage incinerator from corrosion caused by the reverse string of the incinerator flue gas, and can also protect the connecting flange 8 connected to the furnace body from corrosion caused by the reverse string of the incinerator flue gas. Preferably, a pressure gauge is set upstream of the pipeline of the double-headed screw pipe 5 to control the pressure in the liquid inlet pipe 1. Of course, a filter screen can also be set at the front end of the liquid inlet pipe to reduce the possibility of blockage and improve the use stability of the concentrated liquid back-spray device.

[0029] In this embodiment, the liquid inlet pipe 1 and the air inlet pipe 6 are coaxial. An annular groove 12 is provided on the outer side of the liquid inlet pipe 1, and the annular groove 12 is close to the positioning plate 4. A screw hole 10 is provided on the circumferential surface of the air inlet pipe 6, and the fastening screw 9 is screwed into the screw hole 10 and the annular groove 12 to achieve the locking of the liquid inlet pipe 1 and the air inlet pipe 6.

[0030] In this embodiment, the inlet of the liquid inlet pipe is connected to the concentrated liquid booster pump through the double-headed screw tube 5, and the pressurized high-pressure concentrated liquid directly enters the liquid inlet pipe 1 and is sprayed out from the nozzle 3 in the form of mist, with a large coverage area and a long spray distance, and has a relatively good treatment effect. In particular, the high requirements for the spraying effect of the leachate or concentrated liquid of a large-scale domestic waste incinerator can be properly solved, and the concentrated liquid can be better treated under the premise of ensuring the working conditions of the domestic waste incinerator. At the same time, by arranging an elbow joint 2 between the outlet of the liquid inlet pipe 1 and the nozzle 3, the opening of the nozzle 3 is tilted downward by the elbow joint 2. When the elbow joint 2 and the nozzle 3 are extended into the furnace of the waste incinerator, the concentrated liquid is sprayed toward the bottom of the incinerator, and the high-temperature flue gas generated by the incineration is diffused toward the top of the incinerator, realizing the reverse flow contact between the concentrated liquid and the high-temperature flue gas inside the incinerator, which is more conducive to the contact and heat exchange between the concentrated liquid and the high-temperature flue gas, and significantly improves the flue gas cooling effect.

[0031] like Figure 4 and Figure 5 As shown, both ends of the elbow joint 2 are provided with an external thread 21 and an internal thread 22 , respectively. The elbow joint 2 is threadedly connected to the outlet of the liquid inlet pipe 1 via the external thread 21 , and the elbow joint 2 is connected to the connecting thread 31 of the nozzle 3 via the internal thread 22 .

[0032] like Figure 1 and Figure 3 As shown, a positioning plate 4 is sleeved on the outer side of the liquid inlet pipe 1 , and the positioning plate 4 is close to the inlet of the liquid inlet pipe 1 . The positioning plate 4 is used to achieve the end sealing of the air inlet pipe 6 .

[0033] like Figure 3 As shown, a plurality of guide blocks 11 are evenly distributed on the outside of the liquid inlet pipe 1. The guide blocks 11 are close to the outlet of the liquid inlet pipe 1. The guide blocks 11 are used to support the air inlet pipe 6 to improve the installation stability of the air inlet pipe 6.

[0034] like Figure 6 As shown, the nozzle 3 includes a conical head 32 and an oblate notch 33 provided on the end surface of the small diameter end of the conical head 32. The oblate notch 33 constitutes a nozzle. The nozzle in the shape of the oblate notch 33 has a larger coverage area, and the sprayed concentrated liquid is atomized in a fan shape, which is easier to evaporate.

[0035] Furthermore, the diameter of the outward end of the oblate notch 33 is L1, and the diameter of the inward end is L2, L1>L2, which is more conducive to expanding the spray range.

[0036] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the utility model without departing from the spirit and technical solution of the utility model, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A concentrated liquid back-spraying device suitable for a waste incineration power plant, characterized in that: include: A spray gun, an air inlet pipe (6) and a connecting flange (8); the spray gun comprises a liquid inlet pipe (1), an elbow joint (2) and a nozzle (3); the outlet of the liquid inlet pipe (1) is connected to the nozzle (3) through the elbow joint (2), and the inlet of the liquid inlet pipe (1) is connected to the concentrated liquid booster pump through a double-threaded spiral tube (5); when the elbow joint (2) and the nozzle (3) are extended into the furnace of a waste incinerator, the opening of the nozzle (3) is tilted downward to achieve the concentrated liquid spraying toward the bottom of the incinerator; the air inlet pipe (6) is nested and fixed on the outside of the liquid inlet pipe (1), one end of the air inlet pipe (6) close to the double-threaded spiral tube (5) is closed and the other end close to the nozzle (3) is open, an air inlet (7) is provided on the circumferential surface of the air inlet pipe (6), and the connecting flange (8) is sleeved on the outside of the air inlet pipe (6) to fix the concentrated liquid back-spraying device on the waste incinerator.

2. The concentrated liquid back-spraying device suitable for a waste incineration power plant according to claim 1 is characterized in that: The bending angle β of the elbow joint (2) is 30° to 45°.

3. The concentrated liquid back-spraying device suitable for a waste incineration power plant according to claim 1 is characterized in that: The two ends of the elbow joint (2) are respectively provided with an external thread (21) and an internal thread (22); the elbow joint (2) is connected to the outlet thread of the liquid inlet pipe (1) via the external thread (21); and the elbow joint (2) is connected to the inlet thread of the nozzle (3) via the internal thread (22).

4. The concentrated liquid back-spraying device suitable for a waste incineration power plant according to any one of claims 1 to 3, characterized in that: A positioning plate (4) is sleeved on the outside of the liquid inlet pipe (1), and the positioning plate (4) is close to the inlet of the liquid inlet pipe (1). The positioning plate (4) is used to achieve sealing of the end of the air inlet pipe (6).

5. The concentrated liquid back-spraying device applicable to a waste incineration power plant according to claim 4 is characterized in that: An annular groove (12) is provided on the outer side of the liquid inlet pipe (1), and the annular groove (12) is close to the positioning plate (4); a screw hole (10) is provided on the circumferential surface of the air inlet pipe (6), and a fastening screw (9) is screwed into the screw hole (10) and the annular groove (12) to achieve locking of the liquid inlet pipe (1) and the air inlet pipe (6).

6. The concentrated liquid back-spraying device suitable for a waste incineration power plant according to any one of claims 1 to 3, characterized in that: A plurality of guide blocks (11) are evenly distributed on the outside of the liquid inlet pipe (1), the guide blocks (11) are close to the outlet of the liquid inlet pipe (1), and the guide blocks (11) are used to support the air inlet pipe (6).

7. The concentrated liquid back-spraying device suitable for a waste incineration power plant according to any one of claims 1 to 3, characterized in that: The nozzle (3) comprises a conical head (32) and an oblate notch (33) provided on the end surface of the small diameter end of the conical head (32), wherein the oblate notch (33) constitutes a nozzle.

8. The concentrated liquid back-spraying device applicable to a waste incineration power plant according to claim 7 is characterized in that: The diameter of the outward end of the oblate notch (33) is L1, and the diameter of the inward end is L2, where L1>L2.

9. The concentrated liquid back-spraying device suitable for a waste incineration power plant according to any one of claims 1 to 3, characterized in that: The liquid inlet pipe (1) and the air inlet pipe (6) are coaxial.

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