A dual-flow sealing device for denitrification robotic arms in waste-to-energy power plants

Abstract

This utility model discloses a dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant, comprising a jet ring and a suction ring. The suction ring is disposed inside the jet ring, and the jet ring and suction ring are connected and fixed by a connecting bracket. Multiple airflow nozzles are evenly distributed on the jet ring, and multiple airflow suction ports are evenly distributed on the suction ring. The dual-airflow sealing device is disposed within the connection channel between the denitrification robotic arm and the waste-to-energy incinerator flue. The suction ring is used to connect to the interface flange of the waste-to-energy incinerator flue. The jet ring and the denitrification robotic arm are concentrically arranged, with the denitrification robotic arm passing through the suction ring and the connection channel to extend into the waste-to-energy incinerator flue. The jet ring sprays compressed air toward the interior of the waste-to-energy incinerator flue, and the suction ring draws in gas diffused to the vicinity of the denitrification robotic arm. The jet ring and suction ring together form a dynamic sealing barrier. This utility model features a compact structure, simple principle, and high stability, improving the sealing effect of the denitrification robotic arm.

Description

Technical Field

[0001] This utility model relates to the field of waste incineration treatment, specifically to a dual-airflow sealing device for a denitrification robotic arm in a waste incineration power plant. Background Technology

[0002] In the high-efficiency denitrification system of waste-to-energy power plants, the ammonia injection robotic arm is one of the core pieces of equipment. Its main function is to precisely inject ammonia water or urea solution into the flue gas, where it reacts with nitrogen oxides (NOx) to produce harmless nitrogen and water. However, due to the high temperature, high corrosiveness, and high dust content of waste incineration flue gas, the ammonia injection robotic arm operates under harsh conditions for extended periods, leading to the following prominent problems:

[0003] (1) Air leakage at the connection between the robotic arm and the furnace wall / flue

[0004] The connection between the robotic arm and the furnace wall or flue fails due to sealing failure, leading to external air infiltration or flue gas leakage, causing coking. Increased oxygen content in the flue gas disrupts the chemical balance of the reduction reaction, reducing denitrification efficiency (potentially exceeding NOx emission standards) and causing boiler oxygen corrosion. Furthermore, the air leakage point becomes a localized low-temperature zone, resulting in incomplete coking and reaction of injected urea, exacerbating ammonia escape (NH3 concentration > 8 ppm).

[0005] (2) Air leakage introduces cold air

[0006] Cold air enters the flue through sealed gaps, causing a sharp drop in the flue gas temperature around the robotic arm, deviating from the optimal SNCR reaction temperature window. The ideal temperature for SNCR is 850–1100℃. Below 850℃, the ammonia reaction efficiency is insufficient, and above 1100℃, ammonia is easily oxidized to NOx. Temperature fluctuations lead to increased ammonia escape, which in turn causes equipment corrosion and fly ash pollution.

[0007] (3) Aging and wear of sealing materials

[0008] Traditional sealing materials (such as asbestos and ceramic fiber) age rapidly under high temperatures and mechanical vibrations, requiring the sealing structure to be replaced every 3 to 6 months, resulting in high maintenance costs during furnace shutdowns. Moreover, air leakage problems recur after the seal fails, creating a vicious cycle. Utility Model Content

[0009] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a dual-airflow sealing device for denitrification robotic arms in waste incineration power plants that is simple in principle, convenient to operate, has high operational stability and long service life.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0011] A dual-flow sealing device for a denitrification robotic arm in a waste-to-energy incineration plant includes a jet ring and a suction ring. The suction ring is disposed inside the jet ring, and the jet ring and suction ring are connected and fixed by a connecting bracket. Multiple airflow nozzles are evenly distributed on the jet ring, and multiple airflow suction ports are evenly distributed on the suction ring. The dual-flow sealing device is disposed within the connection channel between the denitrification robotic arm and the waste-to-energy incinerator flue. The suction ring is used to connect to the interface flange of the waste-to-energy incinerator flue. The jet ring and the denitrification robotic arm are concentrically arranged, with the denitrification robotic arm passing through the suction ring and the connection channel to extend into the waste-to-energy incinerator flue. The jet ring sprays compressed air toward the interior of the waste-to-energy incinerator flue to prevent high-temperature flue gas from escaping. The suction ring draws in gas diffused to the vicinity of the denitrification robotic arm to prevent gas leakage within the incinerator flue. The jet ring and suction ring together form a dynamic sealing barrier.

[0012] As a further improvement of this utility model, the plurality of airflow nozzles and the plurality of airflow suction ports are arranged alternately in the horizontal plane.

[0013] As a further improvement of this utility model, the airflow nozzle is tilted 15° to 30° toward the denitrification robotic arm.

[0014] As a further improvement of this utility model, the airflow suction port is connected to the auxiliary suction assembly, and the auxiliary suction assembly adopts a Venturi suction structure.

[0015] As a further improvement of this utility model, the auxiliary suction assembly includes an air intake port, a compressed air inlet, and an exhaust port; the air intake port is located at the throat of the auxiliary suction assembly to connect to the airflow suction port; the compressed air inlet and the exhaust port are respectively located at both ends of the auxiliary suction assembly, the compressed air inlet is connected to a compressed air source, and the exhaust port is connected to a smoke exhaust pipe.

[0016] As a further improvement of this utility model, there is a gap of 5±1cm between the jet ring and the denitrification robotic arm.

[0017] As a further improvement of this utility model, the height of the airflow nozzle is greater than the height of the airflow suction port.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This invention relates to a dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant. It involves concentrically positioning a suction ring with multiple airflow inlets inside a jet ring with multiple airflow nozzles, with the jet ring and suction ring connected and fixed together by a connecting bracket to form a single unit. The suction ring is connected to the interface flange of the waste incinerator flue, thus establishing the dual-airflow sealing device within the connection channel between the denitrification robotic arm and the waste incinerator flue. The denitrification robotic arm extends into the waste incinerator flue by passing through the suction ring and the connection channel. Compressed air is sprayed into the waste incinerator flue by the jet ring, using the pressurized high-speed airflow to disperse the high-temperature flue gas near the robotic arm, preventing it from approaching the outer periphery of the robotic arm and damaging it, and also preventing it from leaking out through the connection channel. The suction ring draws in the gas diffused to the vicinity of the denitrification robotic arm, further preventing gas leakage within the furnace and reducing the erosion and wear caused by high-pressure gas on the outer side of the robotic arm. The jet ring and suction ring together form a dynamic sealing barrier, ensuring sealing performance and extending the service life of the robotic arm. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the dual-airflow sealing device for the denitrification robotic arm in a waste incineration power plant, as described in a specific embodiment of this utility model.

[0021] Figure 2 This is a top view schematic diagram of the dual-airflow sealing device for a denitrification robotic arm in a waste incineration power plant, as described in a specific embodiment of this utility model.

[0022] Figure 3 This is a schematic diagram of the structural principle of the auxiliary suction component in a specific embodiment of the present invention;

[0023] Legend: 1. Airflow nozzle; 2. Airflow suction port; 3. Jet ring; 4. Suction ring; 5. Connecting bracket; 6. Auxiliary suction assembly; 61. Air intake port; 62. Compressed air inlet; 63. Exhaust port. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0025] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model.

[0026] 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, "multiple" means two or more, unless otherwise explicitly specified.

[0027] Example

[0028] like Figure 1 and Figure 2 As shown, the dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy incineration plant includes a jet ring 3 and a suction ring 4. The suction ring 4 is disposed inside the jet ring 3, and the jet ring 3 and suction ring 4 are connected and fixed by a connecting bracket 5. Multiple airflow nozzles 1 are evenly distributed on the jet ring 3, and multiple airflow suction ports 2 are evenly distributed on the suction ring 4. The dual-airflow sealing device is disposed within the connection channel between the denitrification robotic arm and the waste incinerator flue. The suction ring 4 is used to connect to the interface flange of the waste incinerator flue. The jet ring 3 and the denitrification robotic arm are concentrically arranged, and the denitrification robotic arm extends into the waste incinerator flue by passing through the suction ring 4 and the connection channel. The jet ring 3 sprays compressed air toward the interior of the waste incinerator flue to prevent high-temperature flue gas from escaping. The suction ring 4 draws in gas diffused to the vicinity of the denitrification robotic arm to prevent gas leakage within the incinerator flue. The main airflow is provided by the jet ring 3, and the auxiliary airflow is provided by the suction ring 4. The jet ring 3 and the suction ring 4 together form a dynamic sealing barrier, and a slight negative pressure (-10 to -30 kPa) is formed in the connecting channel to prevent gas from escaping from the waste incinerator flue. It can be understood that in this embodiment, the denitrification robotic arm can be installed directly above the incinerator flue, extending vertically into the flue. The jet ring 3 jets high-speed airflow downwards, and the suction ring 4 draws airflow upwards.

[0029] In this embodiment, a suction ring 4 with multiple airflow suction ports 2 is concentrically arranged inside a jet ring 3 with multiple airflow nozzles 1, and the jet ring 3 and suction ring 4 are connected and fixed together by a connecting bracket 5 to form a whole. By connecting the suction ring 4 to the interface flange of the waste incinerator flue, a dual airflow sealing device is achieved. This device is installed in the connection channel between the denitrification robotic arm and the waste incinerator flue. The denitrification robotic arm extends into the waste incinerator flue by passing through the suction ring 4 and the connection channel. Compressed air is sprayed into the waste incinerator flue by the jet ring 3, using the pressurized high-speed airflow to disperse the high-temperature flue gas near the robotic arm, preventing the high-temperature flue gas from approaching the outer periphery of the robotic arm and damaging it, and also preventing the high-temperature flue gas from approaching the connection channel and leaking out. The suction ring 4 draws in the gas diffused to the vicinity of the denitrification robotic arm, further preventing gas leakage in the furnace and reducing the scouring and wear caused by high-pressure gas on the outer side of the robotic arm. The jet ring 3 and suction ring 4 together form a dynamic sealing barrier, ensuring sealing performance and improving the service life of the robotic arm.

[0030] like Figure 2 As shown, multiple airflow nozzles 1 and multiple airflow suction ports 2 are arranged alternately in the horizontal plane. This staggered arrangement allows the airflow from the nozzles 1 and suction ports 2 to complement each other, creating a more uniform airflow field. This avoids direct airflow collisions and mutual interference, thereby improving airflow stability and sealing effect. Furthermore, it allows for better utilization of the airflow pressure difference to seal the gap between the de-pin robotic arm and the waste incinerator flue, improving the overall performance of the pneumatic sealing device. It can be understood that the specific number of airflow nozzles 1 and suction ports 2 can be set according to the actual incinerator requirements.

[0031] In this embodiment, the airflow nozzle 1 is tilted at 15° to 30° toward the denitrification robotic arm. The multiple airflow nozzles 1 on the jet ring 3 can fully cover the main leakage paths between the denitrification robotic arm and the incinerator flue wall.

[0032] In this embodiment, the airflow suction port 2 is connected to the auxiliary suction assembly 6, which employs a Venturi suction structure. By using a Venturi suction structure in conjunction with a vacuum pump, suction efficiency is improved. In this embodiment, a pressure sensor is installed in the connecting channel for pressure feedback, and a control valve group is set up to link the auxiliary airflow and the main airflow for blowing. When positive pressure occurs, the auxiliary airflow is increased; when negative pressure is too high, the auxiliary airflow is decreased; otherwise, the current flow rate is maintained. Pressure changes within the connecting channel are kept within ±5Pa to ensure pressure balance. Specifically, the pressure sensor has a range of ±100Pa, a pressure accuracy of ±1Pa, and a response time of 0.3s.

[0033] like Figure 3As shown, the auxiliary suction assembly 6 includes an air intake 61, a compressed air inlet 62, and an exhaust port 63. The air intake 61 is located at the throat of the auxiliary suction assembly 6 to connect to the airflow suction port 2; the compressed air inlet 62 and the exhaust port 63 are located at opposite ends of the auxiliary suction assembly 6, respectively. The compressed air inlet 62 is connected to a compressed air source, and the exhaust port 63 is connected to a smoke exhaust pipe. The specific working principle of the venturi tube will not be elaborated here.

[0034] In this embodiment, there is a 5cm gap between the airflow nozzle 1 of the jet ring 3 and the denitrification robotic arm, which can both disperse the high-temperature flue gas close to the outside of the denitrification robotic arm and prevent the high-pressure airflow from directly scouring the outside of the denitrification robotic arm.

[0035] like Figure 1 As shown, the height of the airflow nozzle 1 is greater than the height of the airflow suction port 2. The compressed air source delivers a gas pressure of 0.8 MPa and a flow rate of 4.2 m³ / s to the airflow nozzle 1. 3 The air extraction rate of air intake 2 is 1.5m / min. 3 / min.

[0036] In this embodiment, the working process of the dual-airflow sealing device includes:

[0037] Start-up phase:

[0038] System self-test: Check the airflow patency of each airflow nozzle and airflow suction port (0.3MPa test pressure).

[0039] Pre-adjustment: The initial flow rate of the main airflow is set to 2.8 m. 3 / min, auxiliary airflow -15Kpa.

[0040] Normal operation:

[0041] The pressure sensor monitors the pressure within the connection channel in real time.

[0042] When P is greater than +5Pa, the vacuum pump frequency increases by 5Hz / cycle;

[0043] When P is less than -5Pa, the vacuum pump frequency decreases by 5Hz / cycle;

[0044] Keep the current parameters within the range of ±5Pa.

[0045] An alarm will sound if the positive or negative pressure is insufficient, indicating abnormal fluctuations in the incinerator's operating conditions, and the denitrification robotic arm will automatically disengage.

[0046] In this embodiment, the dual-airflow sealing device and intelligent pressure regulation design of the connecting channel fundamentally solve the three core contradictions of material performance limitations, insufficient dynamic adaptation, and inefficient resource utilization in the existing technology, ultimately achieving the goals of high sealing performance, long service life, and low operating costs.

[0047] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A double airflow sealing device for a denitration mechanical arm of a waste incineration power plant, characterized in that, The device includes a jet ring (3) and a suction ring (4). The suction ring (4) is located inside the jet ring (3), and the jet ring (3) and the suction ring (4) are connected and fixed by a connecting bracket (5). The jet ring (3) has multiple airflow nozzles (1) evenly distributed on it, and the suction ring (4) has multiple airflow suction ports (2) evenly distributed on it. The dual airflow sealing device is located in the connection channel between the denitrification robotic arm and the waste incinerator flue. The suction ring (4) is used to connect the interface flange of the waste incinerator flue. The jet ring (3) is concentrically arranged with the denitrification robotic arm. The denitrification robotic arm passes through the suction ring (4) and the connection channel to extend into the waste incinerator flue. The jet ring (3) is used to spray compressed air toward the inside of the waste incinerator flue to prevent high-temperature flue gas from overflowing. The suction ring (4) is used to suck up the gas that diffuses to the vicinity of the denitrification robotic arm to prevent gas leakage in the incinerator flue. The jet ring (3) and the suction ring (4) together form a dynamic sealing barrier.

2. The dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant according to claim 1, characterized in that, The plurality of airflow nozzles (1) and the plurality of airflow suction ports (2) are arranged alternately in the horizontal plane.

3. The dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant according to claim 1, characterized in that, The airflow nozzle (1) is tilted 15° to 30° toward the denitrification robotic arm.

4. The dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant according to any one of claims 1 to 3, characterized in that, The airflow suction port (2) is connected to the auxiliary suction assembly (6), which adopts a Venturi suction structure.

5. The dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant according to claim 4, characterized in that, The auxiliary suction assembly (6) includes an air intake (61), a compressed air inlet (62), and an exhaust port (63); the air intake (61) is located at the throat of the auxiliary suction assembly (6) to connect to the airflow suction port (2); the compressed air inlet (62) and the exhaust port (63) are located at both ends of the auxiliary suction assembly (6), the compressed air inlet (62) is connected to a compressed air source, and the exhaust port (63) is connected to a smoke exhaust pipe.

6. The dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant according to any one of claims 1 to 3, characterized in that, There is a gap of 5±1cm between the jet ring (3) and the denitrification robotic arm.

7. The dual-airflow sealing device for a denitrification robotic arm in a waste-to-energy power plant according to any one of claims 1 to 3, characterized in that, The height of the airflow nozzle (1) is greater than the height of the airflow suction port (2).

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