Blanking opening nitrogen sealing device for converter waste heat boiler

Abstract

The utility model belongs to the technical field of converter waste heat boilers, and relates to a feed opening nitrogen sealing device for a converter waste heat boiler. The nitrogen sealing device is arranged at a feed opening in the surface of the waste heat boiler and is a double-layer cylinder with an airflow channel, and the airflow channel is communicated with the feed opening. A nitrogen introducing pipe is arranged on the outer cylinder wall of the nitrogen sealing device, and a plurality of nitrogen spraying holes are formed in the inner cylinder wall of the nitrogen sealing device in an annular array manner; the plurality of nitrogen spraying holes are divided into upper-layer spraying holes and lower-layer spraying holes along the axial direction of the nitrogen sealing device; the upper-layer spray holes are horn-shaped holes and are formed in the wall of the inner cylinder far away from the feed opening in a manner that outlets of the spray holes face the center of the nitrogen sealing device; and the lower-layer spray holes are inclined holes and are obliquely arranged on the wall of the inner cylinder close to the feed opening in a manner that outlets of the spray holes face the center of the feed opening. By optimizing the types and the arrangement positions of the nitrogen spray holes, a more complete and effective sealing air curtain can be formed on the premise that the air consumption is not increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to converter waste heat boiler technical field relates to a kind of discharging port nitrogen seal device for converter waste heat boiler. BACKGROUND

[0002] Converter waste heat boiler is the key equipment in steel smelting industry, which is mainly used for efficient recycling of high-temperature flue gas waste heat generated in converter smelting process. The furnace mouth section of waste heat boiler is provided with a discharging port, and the discharging port is connected with the discharging chute of the external feeding system to receive the material from the external feeding system through the discharging chute and send it into the converter through the waste heat boiler.

[0003] To prevent high-temperature flue gas in the waste heat boiler from entering the discharging chute through the discharging port and causing the feeding equipment to deform due to high temperature or the impurities in the dust-containing flue gas to accumulate in the feeding system, a nitrogen isolation device is usually provided at the discharging port.

[0004] However, the existing nitrogen isolation device is not easy to form an effective sealing air curtain in the near inner wall area, and the range of the sealing area is small. When the sealing effect is not good, the amount of nitrogen needs to be increased to enhance the sealing performance. UTILITY MODEL CONTENTS

[0005] Therefore, the purpose of the utility model is to provide a discharging port nitrogen seal device for converter waste heat boiler to improve the sealing effect in the near inner wall area and form a more complete and effective sealing air curtain without increasing the gas consumption.

[0006] To achieve the above purpose, the utility model provides a discharging port nitrogen seal device for converter waste heat boiler, which is a double-layer cylinder with airflow channel, and is arranged at the discharging port on the surface of the waste heat boiler, and the airflow channel is in communication with the discharging port. The nitrogen seal device is a double-layer cylinder, a nitrogen inlet pipe is arranged on the outer cylinder wall, and a plurality of nitrogen injection holes are arranged on the inner cylinder wall in an annular array. The plurality of nitrogen injection holes are divided into upper injection holes and lower injection holes along the axial direction of the nitrogen seal device. The upper injection holes are all horn holes, and are arranged on the inner cylinder wall away from the discharging port with the injection hole outlet facing the center of the nitrogen seal device. The lower injection holes are all inclined holes, and are inclinedly arranged on the inner cylinder wall close to the discharging port with the injection hole outlet facing the center of the discharging port.

[0007] Optionally, the horn hole includes a straight hole section and an expansion section, and the expansion angle α of the expansion section is 45°.

[0008] Optionally, the depth of the straight hole section and the expansion section is 5mm.

[0009] Optionally, the axis of each upper injection hole is parallel to the radial direction of the nitrogen seal device.

[0010] Optionally, the included angle β between the axis of each lower injection hole and the radial direction of the nitrogen seal device is 20°.

[0011] Optionally, the upper layer of the spray hole includes 60 evenly distributed trumpet holes.

[0012] Optionally, the lower layer of the spray hole includes 60 evenly distributed inclined holes.

[0013] The beneficial effects of the present application are as follows:

[0014] The present application provides a nitrogen sealing device for a downcomer of a converter waste heat boiler, which significantly improves the sealing effect and optimizes the nitrogen consumption by optimizing the type and arrangement position of the nitrogen spray hole. Specifically, the present application provides two layers of spray holes, the upper layer of the spray hole is a trumpet-shaped spray hole composed of a straight hole section and an expansion section, which reduces the flow rate of the gas after being introduced into the trumpet-shaped spray hole. At the same time, the number of upper layer spray holes is arranged reasonably according to the gas radiation area to ensure that the inner surface of the inner cylinder wall of the downcomer nitrogen sealing device can be fully filled with sealing gas. Further, the central region sealing curtain formed by the upper layer of the spray hole and the lower layer of the spray hole can form a more complete and effective sealing gas curtain under the condition of maintaining the same gas consumption as the existing nitrogen sealing device.

[0015] Furthermore, the present application optimizes the size, number and arrangement of the upper layer of the spray hole and the lower layer of the spray hole, and realizes accurate control of the nitrogen spray effect, which further improves the overall sealing effect.

[0016] Other advantages, objects and features of the present application will be explained in the following description, and will be apparent to those skilled in the art based on the following description, or can be learned from the practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will be a preferred detailed description of the present application combined with the drawings, in which:

[0018] Fig. 1 A structure diagram of a nitrogen sealing device for a downcomer of a converter waste heat boiler is provided.

[0019] Fig. 2 A local enlarged schematic view of the nitrogen sealing device B for a downcomer of a converter waste heat boiler is provided.

[0020] Fig. 3The utility model provides a kind of A-A section view of nitrogen seal device for discharge port of converter waste heat boiler.

[0021] Reference signs: 100-outer cylinder wall;200-inner cylinder wall;300-nitrogen introduction pipe;400-upper layer injection hole;410-horn hole;411-straight hole section;412-expansion section;500-lower layer injection hole;510-oblique hole;600-gas flow channel. DETAILED DESCRIPTION

[0022] The other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the specification. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and the features in the following examples and embodiments can be combined with each other without conflict.

[0023] The drawings are only used for illustrative explanation, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the present application. In order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. It is understandable for those skilled in the art that some known structures and their descriptions in the drawings may be omitted.

[0024] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components. In the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only used for illustrative explanation, and cannot be understood as a limitation of the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] The discharge port is connected with the discharge chute pipe of the external feeding system to receive the material from the external feeding system through the discharge chute pipe and send it into the converter through the waste heat boiler.

[0026] In order to prevent high-temperature flue gas in the waste heat boiler from entering the discharging chute through the discharging opening and causing the feeding equipment to be deformed due to high temperature or impurities in the dust-containing flue gas to be accumulated in the feeding system, a nitrogen isolation device is usually arranged at the discharging opening. However, the existing nitrogen isolation device is not easy to form an effective sealing gas curtain in the near inner wall area, and the range of the sealing area is small, and when the sealing effect is poor, the amount of nitrogen needs to be increased to enhance the sealing performance.

[0027] The nitrogen sealing device of the utility model improves the distribution of the sprayed gas flow by optimizing the size and position distribution of the spray holes, effectively solves the problem that the existing nitrogen sealing device is difficult to form an effective sealing gas curtain in the near inner wall area, improves the reliability and efficiency of the sealing, reduces the nitrogen consumption, and provides a strong guarantee for the stable operation of the converter waste heat boiler system.

[0028] Specifically, please refer to Figs. 1-3 The nitrogen sealing device for the discharging opening of the converter waste heat boiler is arranged at the discharging opening on the surface of the waste heat boiler, which is constructed as a double-layer cylinder with a gas flow channel 600, and the gas flow channel 600 is in communication with the discharging opening. A nitrogen inlet pipe 300 is arranged on the outer cylinder wall 100 of the nitrogen sealing device, and a plurality of nitrogen spray holes are arranged on the inner cylinder wall 200 in an annular array. The plurality of nitrogen spray holes are divided into upper spray holes 400 and lower spray holes along the axial direction of the nitrogen sealing device.

[0029] Further, as shown in Fig. 2 , Fig. 3 The upper spray holes 400 are all horn holes 410, and are arranged at the inner cylinder wall 200 away from the discharging opening in a manner that the spray hole outlets face the center of the nitrogen sealing device. The upper spray holes 400 include 60 uniformly distributed horn holes 410, and the axis of each upper spray hole 400 is parallel to the radial direction of the nitrogen sealing device. The horn hole 410 includes a straight hole section 411 and an expansion section 412, the expansion angle α of the expansion section 412 is 45°, and the depth of the straight hole section 411 and the expansion section 412 is 5mm.

[0030] Further, the lower spray holes are all inclined holes 510, and are arranged at the inner cylinder wall 200 close to the discharging opening in a manner that the spray hole outlets face the center of the discharging opening. The lower spray holes include 60 uniformly distributed inclined holes 510, and the angle β between the axis of each lower spray hole and the radial direction of the nitrogen sealing device is 20°.

[0031] When the nitrogen sealing device for the downcomer of the waste heat boiler of the converter is used, the nitrogen gas enters the interlayer of the outer cylinder wall 100 and the inner cylinder wall 200 through the nitrogen gas introduction pipe 300, and then enters the airflow channel of the nitrogen sealing device through the upper layer of the spray hole 400 and the lower layer of the spray hole 500 on the inner cylinder wall 200, and further enters the downcomer. The nitrogen gas curtain formed by the upper layer of the spray hole 400 and the lower layer of the spray hole 500 can block the downcomer, so as to prevent the high-temperature flue gas in the furnace from flowing into the feeding equipment from the downcomer. Further, when the nitrogen gas passes through the upper layer of the horn hole 410, the nitrogen gas is introduced through the straight hole section 411 and enters the airflow channel of the nitrogen sealing device through the expansion section 412. The upper layer of the spray hole 400 includes 60 horn holes, so that the spraying range of the nitrogen gas sprayed from the expansion section 412 can overlap each other, so that the inner surface of the nitrogen sealing device can also be completely covered by the nitrogen gas curtain.

[0032] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A nitrogen sealing device for a lower outlet of a waste heat boiler of a converter, characterized in that: The nitrogen sealing device is a double-layer cylinder with a gas flow channel (600), which is arranged at the discharge port of the surface of the waste heat boiler and communicates with the discharge port; the nitrogen sealing device is provided with a nitrogen inlet pipe (300) on the outer cylinder wall (100) and a plurality of nitrogen injection holes in an annular array on the inner cylinder wall (200); The plurality of nitrogen injection holes are divided into upper injection holes (400) and lower injection holes (500) along the axial direction of the nitrogen sealing device; The upper injection holes (400) are all horn holes (410) and are arranged on the inner cylinder wall (200) away from the discharge port in a manner that the injection hole outlets face the center of the nitrogen sealing device; The lower injection holes (500) are all inclined holes (510) and are arranged on the inner cylinder wall (200) close to the discharge port in a manner that the injection hole outlets face the center of the discharge port.

2. The blanking nitrogen sealing device according to claim 1, characterized in that: The horn hole (410) comprises a straight hole section (411) and an expansion section (412), and the expansion angle α of the expansion section (412) is 45°.

3. The blanking nitrogen sealing device according to claim 2, characterized in that: The depth of the straight hole section (411) and the expansion section (412) is 5 mm.

4. The blanking nozzle nitrogen blanketing apparatus of claim 1, wherein: The axis of each upper injection hole (400) is parallel to the radial direction of the nitrogen sealing device.

5. The blanking nitrogen sealing device according to claim 1, characterized in that: The angle β between the axis of each lower injection hole (500) and the radial direction of the nitrogen sealing device is 20°.

6. The blanking nitrogen sealing device according to claim 1, characterized in that: The upper injection holes (400) comprise 60 uniformly distributed horn holes (410).

7. The blanking nitrogen sealing device according to claim 1, characterized in that: The lower injection holes (500) comprise 60 uniformly distributed inclined holes (510).

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