Nitrogen charging protection device for slag tapping hole of coal injection mill

Abstract

The utility model discloses a nitrogen charging protection device for a slag tapping hole of a coal injection mill, which is used for ensuring that an air channel of the slag tapping hole of the coal injection mill is smooth, and comprises a nitrogen conveying pipeline with the end part extending into the slag tapping hole of the coal injection mill, the device is characterized in that a nitrogen spray head is arranged at the end, extending into the slag tapping opening, of the nitrogen conveying pipeline, a main runner communicated with the nitrogen conveying pipeline is arranged in the center of the nitrogen spray head, and at least one layer of spray cavities are evenly formed in the axial direction of the main runner at intervals; a plurality of nozzles communicated with the main flow channel are uniformly arranged on each layer of spraying cavity at intervals in the circumferential direction, the nozzles are of arc-shaped structures, and nozzle openings are tangent to the outer surface of the nitrogen spraying head. According to the utility model, the air injection coverage area is wide, the air pressure of the blown nitrogen is high, and sundries and coal gangues attached to the inner wall of the coal injection mill can be well blown off, so that the slag tapping hole of the coal injection mill is clean, the air duct is smooth, and the purpose of safe and stable work of the coal injection mill is achieved.

Description

Technical Field

[0001] The utility model relates to a nitrogen filling protection device for a slag opening of a coal injection mill, which is used for ensuring that an air passage at the slag opening of the coal injection mill is unobstructed. Background Art

[0002] During the process of using the coal injection mill to produce coal powder, some debris, coal gangue, etc. will enter the machine, and the debris will be thrown into the lower part of the air ring through the grinding disc. Due to the internal structure of the coal injection mill, it is necessary to manually open the lower slag port to discharge slag. Continuous this operation will lead to an increase in the oxygen content inside the system and the effect is not ideal. A large amount of debris accumulates at the lower slag port for a long time and cannot be completely discharged, blocking the air duct so that the hot air from the flue gas furnace cannot be discharged in time, causing unstable system parameters, too high inlet temperature, vibration grinding, fire at the lower slag port, etc., affecting the powder output rate of the coal injection mill, reducing the service life of the equipment, and more importantly, it may cause dust explosion inside the system, causing personal injury and equipment damage.

[0003] Therefore, designing a device that can make the airway of the lower slag mouth of the coal injection mill unobstructed is a technical problem that needs to be solved at present. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a nitrogen filling protection device for the lower slag mouth of a coal injection mill. By arranging a plurality of spray cavities in the axial direction inside the nitrogen nozzle, each spray cavity is provided with a plurality of nozzles whose diameters gradually narrow from the main flow channel to the nozzle mouth in the circumferential direction, and the nozzles are of an arc structure and the nozzle mouth is tangent to the outer surface of the nitrogen nozzle; the jet coverage area is wider, the blown nitrogen gas pressure is greater, and the sundries and coal gangue attached to the inner wall of the coal injection mill can be better blown off, thereby achieving the cleaning of the lower slag mouth of the coal injection mill and smooth air duct, and at the same time reducing the oxygen content of the closed system in the coal injection mill, so as to achieve the purpose of safe and stable operation of the coal injection mill.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a nitrogen filling protection device for the lower slag port of a coal injection mill, comprising a nitrogen delivery pipeline with an end extending into the lower slag port of the coal injection mill, characterized in that: a nitrogen nozzle is arranged at the end of the nitrogen delivery pipeline extending into the lower slag port, a main flow channel connected to the nitrogen delivery pipeline is arranged at the center of the nitrogen nozzle, at least one layer of spray chambers is evenly spaced along the axial direction of the main flow channel, each layer of the spray chamber is evenly spaced along the circumferential direction. A plurality of nozzles connected to the main flow channel are arranged, and the nozzles are arc-shaped structures and the nozzle openings are tangent to the outer surface of the nitrogen nozzle.

[0006] A further improvement of the technical solution of the utility model is that the diameter of the main channel gradually decreases along the flow direction of the nitrogen.

[0007] A further improvement of the technical solution of the utility model is that a nitrogen pipeline valve is arranged on the nitrogen delivery pipeline.

[0008] A further improvement of the technical solution of the utility model is that: the nitrogen pipeline valve is a manual valve.

[0009] A further improvement of the technical solution of the utility model is that the number of spray cavities arranged in the nitrogen spray head is 3-5 layers.

[0010] A further improvement of the technical solution of the utility model is that the number of nozzles arranged in each layer of the spray chamber is 3-6.

[0011] A further improvement of the technical solution of the utility model is that the diameter of the nozzle gradually narrows from the main flow channel to the nozzle opening.

[0012] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0013] The nitrogen spray head of the utility model has multiple layers of spray cavities evenly spaced in the axial direction of the main flow channel, each layer of the spray cavity includes multiple nozzles, so the coverage is wider and the spraying area is larger.

[0014] The nozzle of the utility model is an arc-shaped structure, and the nozzle opening is tangent to the outer surface of the nitrogen nozzle. The nitrogen blown out of the nozzle of this structure can better blow off the sundries and coal gangue attached to the inner wall of the coal injection mill.

[0015] The diameter of the main channel of the utility model gradually decreases along the flow direction of nitrogen and the diameter of the nozzle gradually narrows from the main channel to the nozzle opening, and the air outlet area is small. This design makes the blown nitrogen gas pressure more sufficient and the blowing effect better.

[0016] The utility model provides a nitrogen pipeline valve on the nitrogen delivery pipeline which is manually opened or closed along with the coal injection mill, which has higher safety and is more energy-saving and consumption-reducing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the connection structure of the utility model.

[0018] Figure 2 It is a schematic diagram of the structure of the nitrogen nozzle of the utility model.

[0019] Figure 3 It is a cross-sectional view of the nitrogen nozzle of the utility model.

[0020] Figure 4 It is a schematic diagram of the spray chamber structure of the utility model.

[0021] Among them, 1. nitrogen nozzle; 2. spray chamber; 3. nozzle; 4. coal injection mill; 5. slag outlet; 6. nitrogen delivery pipeline; 7. nitrogen pipeline valve; 8. main channel. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the embodiments:

[0023] like Figure 1-Figure 4 As shown, a nitrogen filling protection device for the slag outlet of a coal injection mill comprises a nitrogen nozzle 1, a spray chamber 2, a nozzle 3, a coal injection mill 4, a slag outlet 5, a nitrogen delivery pipeline 6, a nitrogen pipeline valve 7 and a main channel 8.

[0024] The slag outlet 5 is located at one side below the coal injection mill 4. One end of the nitrogen delivery pipeline 6 extends deep into the slag outlet 5 and is connected to a nitrogen nozzle 1. The nitrogen delivery pipeline 6 is also provided with a nitrogen pipeline valve 7 which is manually opened or closed with the coal injection mill 4, so that the overall safety of the device is higher and more energy-saving and consumption-reducing.

[0025] A main channel 8 connected to the nitrogen delivery pipeline 6 is arranged at the center of the nitrogen nozzle 1. The diameter of the main channel 8 gradually decreases along the flow direction of the nitrogen, and the air outlet area is small. This design makes the nitrogen blown out have a higher pressure and a better purging effect.

[0026] A plurality of spray cavities 2 are evenly spaced in the axial direction inside the nitrogen nozzle 1, and three layers are provided in this embodiment. A plurality of nozzles 3 are evenly spaced in the circumferential direction on each layer of the spray cavity 2, and four nozzles are provided in this embodiment. This structure has a larger jetting area and a wider coverage. The nozzle 3 is an arc-shaped structure, and the nozzle opening is tangent to the outer surface of the nitrogen nozzle 1. This shape of the nozzle 3 can better blow off the debris and coal gangue attached to the inner wall of the lower slag outlet 5 of the coal injection mill 1, and the diameter of the nozzle 3 gradually narrows from the main flow channel 8 to the nozzle opening, and the small outlet area makes the blown nitrogen gas pressure greater.

[0027] Working principle: The utility model arranges multiple layers of spray chambers 2 evenly at intervals in the axial direction of the nitrogen nozzle 1, and each layer of the spray chamber 2 arranges multiple nozzles 3 evenly at intervals along the circumferential direction. This structure arranges a larger spray area and a wider coverage range; the nozzle 3 is an arc-shaped structure tangent to the outer surface of the nitrogen nozzle 1, and this shape of the nozzle 3 can better blow off the debris and coal gangue attached to the inner wall of the lower slag outlet 5 of the coal injection mill 1; the diameter of the main channel 8 gradually decreases along the flow direction of nitrogen, and the diameter of the nozzle 3 gradually narrows from the main channel 8 to the nozzle outlet, the air outlet area is small, the blown nitrogen pressure is greater, and the purging effect is better; the utility model realizes the cleaning of the lower slag outlet 5 of the coal injection mill 4 and the smoothness of the air duct, and also reduces the oxygen content of the closed system in the coal injection mill 4, so as to achieve the purpose of safe and stable operation of the coal injection mill 4; the nitrogen pipeline valve 7 on the nitrogen delivery pipeline 6 is manually opened or closed with the coal injection mill 4, so that the overall safety of the device is higher and more energy-saving and consumption-reducing.

Claims

1. A nitrogen filling protection device for a slag outlet of a coal injection mill, comprising a nitrogen delivery pipeline (6) whose end extends into a slag outlet (5) of a coal injection mill (4), characterized in that: A nitrogen nozzle (1) is arranged at the end of the nitrogen delivery pipeline (6) extending into the slag lowering port (5); a main flow channel (8) connected to the nitrogen delivery pipeline (6) is arranged at the center of the nitrogen nozzle (1); at least one layer of spray chambers (2) is evenly spaced along the axial direction of the main flow channel (8); each layer of spray chambers (2) is evenly spaced along the circumferential direction and has a plurality of nozzles (3) connected to the main flow channel (8); the nozzles (3) are of an arc-shaped structure and the nozzle openings are tangent to the outer surface of the nitrogen nozzle (1).

2. A nitrogen filling protection device for the lower slag opening of a coal injection mill according to claim 1, characterized in that: The diameter of the main channel (8) gradually decreases along the flow direction of the nitrogen.

3. The nitrogen filling protection device for the lower slag opening of a coal injection mill according to claim 1 is characterized in that: The nitrogen delivery pipeline (6) is provided with a nitrogen pipeline valve (7).

4. A nitrogen filling protection device for the lower slag opening of a coal injection mill according to claim 3, characterized in that: The nitrogen pipeline valve (7) is a manual valve.

5. The nitrogen filling protection device for the lower slag opening of a coal injection mill according to claim 1 is characterized in that: The number of spray chambers (2) provided in the nitrogen spray head (1) is 3-5 layers.

6. The nitrogen filling protection device for the lower slag opening of a coal injection mill according to claim 1 is characterized in that: The number of nozzles (3) arranged on each layer of the spray chamber (2) is 3-6.

7. The nitrogen filling protection device for the lower slag opening of a coal injection mill according to claim 1 is characterized in that: The diameter of the nozzle (3) gradually narrows from the main flow channel toward the nozzle opening.

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