Oxygen-enriched injection device for blast furnace smelting

Abstract

The utility model belongs to the technical field of blast furnace oxygen-enriched injection, and particularly relates to an oxygen-enriched injection device for blast furnace smelting, which comprises a furnace body, a hopper, a feed pipe, an oxygen supply device, an air inlet pipe, an air outlet pipe and a turbulent flow fan, the hopper is arranged on the side wall of the furnace body, the air outlet pipe penetrates through the side wall of the furnace body and then extends into the furnace body, the turbulent flow fan is arranged in the air outlet pipe, and the oxygen supply device is arranged in the furnace body. The turbulent flow fan is rotationally connected with the air outlet pipe, the feeding pipe is arranged in the side wall of the furnace body, a feeding port in the top of the feeding pipe is communicated with the hopper, a discharging port in the bottom of the feeding pipe is communicated with the air outlet pipe, the discharging port is formed above the turbulent flow fan, and the end, located outside the furnace body, of the air outlet pipe is connected with an oxygen supply device through the air inlet pipe. The turbulent flow fan comprises a rotating shaft, fan blades and a screen, wherein the fan blades and the screen are arranged on the rotating shaft. By adopting the oxygen-enriched injection device disclosed by the utility model, pulverized coal can be in full contact with oxygen or oxygen-enriched air when entering the furnace body, so that the pulverized coal can be better combusted, and the combustion efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of blast furnace oxygen-enriched injection, and particularly relates to an oxygen-enriched injection device for blast furnace smelting. BACKGROUND

[0002] A blast furnace is made of a steel plate as a furnace shell, and a refractory brick lining is arranged in the shell. The blast furnace body is divided into a furnace throat, a furnace shaft, a furnace waist, a furnace belly and a furnace hearth from top to bottom. The blast furnace smelting requires a relatively high temperature in the furnace, and air and coal powder are used for injection to improve the combustion efficiency. The oxygen-enriched injection device is a device for injecting oxygen-enriched air or oxygen into the blast furnace.

[0003] The existing oxygen-enriched injection device for blast furnace smelting can refer to the utility model patent with the announcement number CN221681133U. The patent document discloses an oxygen-enriched injection device for blast furnace smelting, which comprises a blast furnace body, a bearing, an air outlet pipe, a support plate and a rotating shaft. The air outlet pipe is inserted and connected to the lower end of the outer wall of one side of the blast furnace body. The support plate is installed on the inner wall of the air outlet pipe. The support plate is internally provided with a circular array of ventilation holes. The filter screen is installed on the inner wall of the ventilation hole. The bearing is embedded and installed on the outer wall of one side of the support plate. The rotating shaft is rotatably installed in the bearing. The connecting frame is installed on the outer wall of both sides of the upper end of the rotating shaft. The connecting plate is installed on the outer wall of the upper end of the connecting frame. The scraper is fixedly attached to the outer wall of one side of the connecting plate away from the connecting frame. The filter screen, the bearing and the scraper are arranged to clean the inner wall of the air outlet pipe, prevent the coal powder from forming a crust on the inner wall of the air outlet pipe, and ensure the smooth flow of the coal powder and the airflow in the air outlet pipe.

[0004] However, during actual use of the device, it is found that a large amount of coal powder cannot be dispersed after entering the pipeline through the hopper, and a large amount of coal powder is blown into the furnace by gathering together. The coal powder cannot be fully contacted with oxygen, resulting in a reduced combustion efficiency.

[0005] Therefore, there is an urgent need for an oxygen-enriched injection device for blast furnace smelting with high combustion efficiency. UTILITY MODEL CONTENTS

[0006] To solve the above-mentioned drawbacks of the prior art, the utility model discloses an oxygen-enriched injection device for blast furnace smelting, which adopts the following technical means:

[0007] An oxygen-enriched injection device for blast furnace smelting, comprising a furnace body, a hopper, a feeding pipe, an oxygen supply device, an air inlet pipe, an air outlet pipe and a turbulence fan,

[0008] The hopper is arranged on the side wall of the furnace body, the air outlet pipe extends into the furnace body after penetrating through the side wall of the furnace body, the turbulence fan is arranged in the air outlet pipe and is rotationally connected with the air outlet pipe, the feeding pipe is arranged in the side wall of the furnace body, the feeding port at the top of the feeding pipe is communicated with the hopper, the discharging port at the bottom of the feeding pipe is communicated with the air outlet pipe, and the discharging port is arranged above the turbulence fan, and one end of the air outlet pipe located outside the furnace body is connected with the oxygen supply device through the air inlet pipe,

[0009] The turbulence fan comprises a rotating shaft, fan blades and a screen arranged on the rotating shaft.

[0010] Further, the number of the fan blades and the screen is more than two, and the fan blades and the screen are alternately arranged on the rotating shaft.

[0011] Further, the air inlet pipe and the air outlet pipe are provided with a reflux pipe, a floating ball and a blocking piece are arranged in the reflux pipe, the blocking piece is arranged between the floating ball and the air inlet pipe, the blocking piece is connected with the inner wall of the reflux pipe through a connecting rod, the diameter of the floating ball is larger than the diameter of the air inlet pipe, and the diameter of the reflux pipe is larger than the diameter of the floating ball.

[0012] Further, one end of the air inlet pipe connected with the reflux pipe is an air outlet, and a crescent-shaped baffle is arranged on the air outlet.

[0013] Further, an arc-shaped limiting seat is arranged at the inner bottom of the reflux pipe, the cross section of the arc-shaped limiting seat along the diameter direction of the reflux pipe is arc-shaped, and the floating ball is arranged on the arc-shaped limiting seat.

[0014] Further, the arc-shaped limiting seat extends upwardly and inclines from one end of the air inlet pipe to one end of the air outlet pipe in the reflux pipe.

[0015] Further, a ring-shaped connecting seat is arranged in the air outlet pipe, and the rotating shaft is rotationally connected with the ring-shaped connecting seat through a bearing.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1、The utility model discloses a turbulence fan is arranged in the air outlet pipe, and the discharging port of the feeding pipe is arranged directly above the turbulence fan, when the air outlet pipe inhales air, the air hits the fan blade and drives the turbulence fan to rotate, the pulverized coal is scattered by the rotating screen and is blown into the furnace body, so that the pulverized coal can fully contact with oxygen or oxygen-rich air when entering, thereby better burning and improving the burning efficiency.

[0018] 2. This utility model sets up a return pipe between the air inlet pipe and the air outlet pipe, and sets up a float and a baffle inside the return pipe. The diameter of the float is larger than the diameter of the air inlet pipe, and the diameter of the return pipe is larger than the diameter of the float. When the air inlet pipe is inlet, it will blow the float. The float will rotate inside the return pipe under the obstruction of the baffle, ensuring normal air intake of the air outlet pipe. When the internal pressure is too high and causes backflow, the air in the air outlet pipe will blow the float. After the float is no longer obstructed, it will block the opening of the air inlet pipe and prevent coal dust backflow. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the spoiler fan in Example 1;

[0021] Figure 3 for Figure 1 A sectional view taken from the top of the furnace body along the plane containing the central axis of the gas outlet pipe;

[0022] Figure 4 This is a schematic diagram of the reflux pipe in Example 1;

[0023] Figure 5 This is a schematic diagram of the structure at the air outlet of the feed pipe in Example 1.

[0024] Among them, 1-furnace body, 2-hopper, 3-feed pipe, 4-air inlet pipe, 401-air outlet, 5-air outlet pipe, 6-turbulence fan, 601-rotating shaft, 601-fan blade, 602-screen, 7-return pipe, 8-float ball, 9-blocking component, 10-connecting rod, 11-crescent-shaped baffle, 12-arc-shaped limit seat. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0026] To describe the spatial relationships of the requirements, three orthogonal directions can be defined: "front and back", "left and right", and "up and down (or vertical)". A spatial rectangular coordinate system can be defined through the relative positional relationships.

[0027] Example 1

[0028] like Figures 1-5 As shown, this utility model discloses an oxygen-enriched injection device for blast furnace smelting, including a furnace body 1, a hopper 2, a feed pipe 3, an oxygen supply device, an air inlet pipe 4, an air outlet pipe 5, and a turbulence fan 6.

[0029] The hopper 2 is arranged on the side wall of the furnace body 1, the air outlet pipe 5 extends into the furnace body 1 after penetrating the side wall of the furnace body 1, the turbulence fan 6 is arranged in the air outlet pipe 5, the turbulence fan 6 is rotationally connected with the air outlet pipe 5, the feeding pipe 3 is arranged in the side wall of the furnace body 1, the feeding port at the top of the feeding pipe 3 is communicated with the hopper 2, the discharging port at the bottom of the feeding pipe 3 is communicated with the air outlet pipe 5, and the discharging port is arranged above the turbulence fan 6, and the end of the air outlet pipe 5 outside the furnace body 1 is connected with the oxygen supply device through the air inlet pipe 4.

[0030] The turbulence fan 6 comprises a rotating shaft 601 and fan blades 602 and screens 603 arranged on the rotating shaft 601, the number of the fan blades 602 and the screens 603 is more than two, and in the embodiment, the number is three, and the fan blades 602 and the screens 603 are alternately arranged on the rotating shaft 601. The rotating shaft 601 is rotationally connected with a ring-shaped connecting seat arranged in the air outlet pipe 5 through a bearing.

[0031] The oxygen supply device is used for providing oxygen-enriched air or oxygen, the oxygen-enriched air or oxygen is blown into the air outlet pipe 5 through the air inlet pipe 4, and when the air inlet pipe 5 inhales air, the air hits the fan blades 602, and the turbulence fan 6 is driven to rotate.

[0032] In the working process, the pulverized coal enters the turbulence fan 6 above the turbulence fan 6 in the air outlet pipe 5 through the hopper 2 and the feeding pipe 3, the turbulence fan 6 can screen and scatter the pulverized coal in the rotating process, so that the pulverized coal can fully contact with the oxygen-enriched air or oxygen, and the combustion efficiency is improved.

[0033] In a preferred scheme of the embodiment, the air inlet pipe 4 and the air outlet pipe 5 are provided with a backflow pipe 7, the backflow pipe 7 is provided with a floating ball 8 and a blocking piece 9, the blocking piece 9 is arranged between the floating ball 8 and the air inlet pipe 4, the blocking piece 9 is used for limiting the floating ball 8, avoiding that the floating ball 8 blocks the air outlet pipe 5, the blocking piece 9 is connected with the inner wall of the backflow pipe 7 through a connecting rod 10, the diameter of the floating ball 8 is greater than the diameter of the air inlet pipe 4, when the air backflow caused by the excessive pressure in the furnace, the floating ball 8 can block the air outlet 401 of the air inlet pipe 4, avoiding that the coal ash enters the air inlet pipe 4. The diameter of the backflow pipe 7 is greater than the diameter of the floating ball 8, so that the oxygen-enriched air or oxygen can smoothly enter the air outlet pipe 5. The end, where the air inlet pipe 4 is connected with the backflow pipe 7, is the air outlet 401, the air outlet 401 is provided with a crescent-shaped baffle 11. The floating ball 8 is blocked and limited by the crescent-shaped baffle 11, avoiding that the floating ball 8 is rolled into the air inlet pipe 4 under the excessive pressure, and the air inlet pipe 4 is blocked too tightly. The inner side of the backflow pipe 7 is provided with an arc-shaped limiting seat 12, the cross section of the arc-shaped limiting seat 12 along the diameter direction of the backflow pipe 7 is arc-shaped, the floating ball 8 is arranged on the arc-shaped limiting seat 12, and the floating ball 8 rolls on the arc-shaped limiting seat 12. The arc-shaped limiting seat 12 extends from the end of the air inlet pipe 4 to the end of the air outlet pipe 5 in the backflow pipe 7. The end, where the arc-shaped limiting seat 12 contacts with the air outlet pipe 5, is higher than the end, where the arc-shaped limiting seat 12 contacts with the air inlet pipe 4, and the end, where the arc-shaped limiting seat 12 contacts with the air inlet pipe 4, is lower, so that the floating ball 8 can be quickly rolled into the air inlet pipe 4 to seal when the floating ball 8 is blown by the air.

[0034] The working principle of the oxygen-enriched injection device is as follows: the oxygen supply device is used for providing oxygen-enriched air or oxygen into the blast furnace, the oxygen-enriched air or oxygen flows into the air outlet pipe 5 through the air inlet pipe 4 and the backflow pipe 7, and drives the turbulence fan 6 in the air outlet pipe 5 to rotate. The coal powder falls into the turbulence fan 6 in the air outlet pipe 5 through the hopper 2 and the feeding pipe 3, is scattered by the screen 603 of the turbulence fan 6, and fully contacts with the oxygen-enriched air or oxygen, so that the combustion efficiency is greatly improved.

[0035] In the normal air inlet process, the oxygen-enriched air or oxygen blows the floating ball 8 when flowing into the air outlet pipe 5 through the air inlet pipe 4 and the backflow pipe 7, the floating ball 8 rotates in the backflow pipe 7 under the block of the blocking piece 9, and the air outlet pipe 5 can normally inlet air, when the air backflow caused by the excessive pressure in the furnace, the air in the air outlet pipe 5 blows the floating ball 8, the floating ball 8 blocks the air outlet 401 of the air inlet pipe 4, avoiding that the coal powder backflows.

[0036] The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An oxygen-enriched injection device for blast furnace smelting, characterized in that, The furnace body (1), the hopper (2), the feeding pipe (3), the oxygen supply device, the air inlet pipe (4), the air outlet pipe (5) and the turbulence fan (6), The hopper (2) is arranged on the side wall of the furnace body (1), the air outlet pipe (5) extends into the furnace body (1) after penetrating through the side wall of the furnace body (1), the turbulence fan (6) is arranged in the air outlet pipe (5), the turbulence fan (6) is rotationally connected with the air outlet pipe (5), the feeding pipe (3) is arranged in the side wall of the furnace body (1), the feeding port at the top of the feeding pipe (3) is communicated with the hopper (2), the discharging port at the bottom of the feeding pipe (3) is communicated with the air outlet pipe (5), and the discharging port is arranged above the turbulence fan (6), and one end of the air outlet pipe (5) located outside the furnace body (1) is connected with the oxygen supply device through the air inlet pipe (4), The turbulence fan (6) comprises a rotating shaft (601), a fan blade (602) and a screen (603) arranged on the rotating shaft (601).

2. The oxygen-rich blowing apparatus according to claim 1, characterized by The number of the fan blade (602) and the screen (603) is more than two, and the fan blade (602) and the screen (603) are alternately arranged on the rotating shaft (601).

3. The oxygen-rich blast device according to claim 1, characterized in that The air inlet pipe (4) and the air outlet pipe (5) are provided with a reflux pipe (7), the reflux pipe (7) is provided with a floating ball (8) and a blocking piece (9), the blocking piece (9) is arranged between the floating ball (8) and the air inlet pipe (4), and the blocking piece (9) is connected with the inner wall of the reflux pipe (7) through a connecting rod (10), The diameter of the floating ball (8) is greater than the diameter of the air inlet pipe (4), and the diameter of the reflux pipe (7) is greater than the diameter of the floating ball (8).

4. The oxygen-rich blast device according to claim 1, characterized in that One end of the air inlet pipe (4) connected with the reflux pipe (7) is an air outlet (401), and a crescent-shaped baffle (11) is arranged on the air outlet (401).

5. The oxygen-enriched injection device according to claim 3, characterized in that An arc-shaped limiting seat (12) is arranged on the inner bottom of the reflux pipe (7), the cross section of the arc-shaped limiting seat (12) cut along the diameter direction of the reflux pipe (7) is arc-shaped, and the floating ball (8) is arranged on the arc-shaped limiting seat (12).

6. The oxygen-enriched injection device according to claim 5, characterized in that The arc-shaped limiting seat (12) extends upwardly and obliquely in the reflux pipe (7) from one end of the air inlet pipe (4) to one end of the air outlet pipe (5).

7. The oxygen-rich blast device of claim 1, wherein An annular connecting seat is arranged in the air outlet pipe (5), and the rotating shaft (601) is rotationally connected with the annular connecting seat through a bearing.

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