Blast furnace swing chute nozzle baking device

Abstract

The utility model belongs to the technical field of blast furnace casting house equipment of iron and steel enterprises, and particularly relates to a blast furnace swing chute baking device which comprises a gas main pipe, a gas branch pipe, a combustion-supporting air main pipe, a combustion-supporting air branch pipe and baking burners, and is characterized by further comprising a baking room with an opening in the front side, roaster bodies are arranged on the left side, the right side and the top side of the roasting room respectively, each roaster body is an independent gas mixing cavity, the outer side of each gas mixing cavity is communicated with a coal gas branch pipe and a combustion-supporting air branch pipe, and a plurality of roasting burners are distributed in the plane area of the inner side of each gas mixing cavity in a matrix mode; and a plurality of sinking baking burners are distributed on the inner surface of the arc-shaped groove corresponding to the swinging sliding nozzle in a profiling manner. The baking device has the beneficial effects that the method is convenient to use, the baking speed is high, the quality of the refractory material for baking the swing chute nozzle is uniform, the energy consumption in the baking process of the swing chute nozzle is reduced, the environmental pollution is reduced, and conditions are created for prolonging the service life of the swing chute nozzle in the next step.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace iron-making field equipment in steel enterprises, and in particular relates to a blast furnace swing spout baking device. Background Art

[0002] As the amount of molten iron produced by blast furnaces in steel enterprises increases, the flow rate of molten iron increases and the tapping time is prolonged, which directly leads to the swinging spout that guides molten iron into the molten iron tank being subjected to increasing pressure. In addition, since the swinging spout has the functions of switching, transitioning and collecting molten iron, the life of the swinging spout will be increasingly challenged in this case. The outer shell of the swinging spout is usually welded with steel plates, and the internal refractory materials are built as a safety lining. The working layer is mostly refractory castables that are in direct contact with molten iron. In order to resist the scouring and erosion of high-temperature molten iron, extending the service life of the swinging spout has become a very urgent task.

[0003] The key factor affecting the service life of the swing chute depends on the baking process in the manufacturing process of its lining. There are two traditional ways to bake the lining: the first is the direct baking method of mixed combustion of firewood and gas, which bakes the swing chute by igniting wood. The disadvantage of this baking method is that the lining is heated unevenly or baked insufficiently, which is easy to cause surface peeling and cracking, affecting the service life of the swing chute. In addition, it is necessary to continuously increase wood and gas, resulting in a long baking time, large smoke and dust during the baking process, and environmental pollution. Another baking method is to set up a straight round tube above the working surface of the swing nozzle, and a series of round holes are arranged on the straight round tube at intervals. The gas is ignited outside through the round holes of the straight tube to form a flame column of similar size and length. Due to the irregular contour of the working surface of the swing nozzle, the distance between the flame at each position and the working surface of the swing nozzle is inconsistent, and the baking effect is very poor; and because the gas supply is adjusted based on experience and there is no device to achieve quantitative adjustment, cracking of the swing nozzle refractory material frequently occurs after baking.

[0004] Therefore, it is necessary to design an environmentally friendly, efficient and uniformly heated swing nozzle baking device. The Chinese utility model patent with announcement number CN203976828U proposes a method of arranging special-shaped tubes in the swing nozzle to complete the baking operation with special-shaped tubes of different heights. However, this method does not consider the problem of environmental pollution caused by the baking process; announcement number CN

[0005] The Chinese patent 210399991U proposes a method of supporting the baking device with a baking rack and setting a heat insulation board above the spout to simply achieve isolation from the outside and protect the environment. Although this baking method is simple and convenient, it still has the problem of not being able to evenly discharge the moisture in the lining. Utility Model Content

[0006] The purpose of the utility model is to provide a blast furnace swing spout baking device, overcome the shortcomings of the prior art, and construct a new swing spout baking process with a special swing spout baking device as the core to improve the swing spout baking quality, meet the temperature required by the refractory baking curve, and scientifically and efficiently discharge the physical water and crystallization water in the swing spout refractory material, so that the lining reaches a stable, heat-resistant and wear-resistant state, prolong the service life of the swing chute, and reduce environmental pollution.

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] A blast furnace swing spout baking device comprises a gas main, a gas branch, a combustion air main, a combustion air branch and baking burners, the gas main is connected to multiple gas branches, the combustion air main is connected to multiple combustion air branches, and the device is characterized in that the device also comprises a baking room with an opening on the front side, the baking room is respectively provided with bakers on the left and right sides and the top side, each baker is an independent gas mixing chamber, the outer sides of the gas mixing chamber are respectively connected to the gas branch and the combustion air branch, the inner plane area of ​​the gas mixing chamber is provided with a plurality of baking burners distributed in a matrix, and a plurality of sunken baking burners are also distributed in a conformal manner on the inner surface of the arc-shaped groove corresponding to the swing spout.

[0009] The gas branch pipe and the combustion air branch pipe are three-way, corresponding to the top side and the left and right sides of the baking room respectively, and the baking burner used is an ignition jet burner.

[0010] The swinging spout is driven by a trolley through a track to enter and exit the baking room from the front opening.

[0011] A smoke exhaust pipe is arranged on the top of the baking room, and the smoke exhaust pipe is connected with the main smoke pipe of the blast furnace workshop through a pipeline.

[0012] A plurality of temperature measuring probes are arranged on the surface of the swinging spout, and the temperature measuring probes are connected to a control box through cables. The control box is respectively connected to the electric control valves on the gas main and the combustion air main through cables. A display screen is provided on the control box to display multiple temperatures.

[0013] The combustion-supporting air main pipe is provided with a variable frequency fan or an air flow guider, and the air flow guider is respectively connected to a compressed air inlet pipe and a natural air inlet pipe.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1) The on-site gas and combustion air resources are fully utilized. The exhaust gas during the baking process can be used to preheat the combustion air. All the detection instruments and controls between the combustion medium and the baking room are operated on the on-site operation cabinet. This method is easy to use, has a fast baking speed, and the quality of the refractory material of the baking swing nozzle is uniform. It not only reduces the energy consumption of the swing nozzle baking process, but also reduces environmental pollution, and creates conditions for the next step of improving the life of the swing nozzle.

[0016] 2) With the swing spout baking device as the core, a new swing spout baking process was constructed, which improved the baking quality of the swing spout, met the temperature required by the refractory baking curve, and scientifically and efficiently discharged the physical water and crystallization water in the refractory of the swing spout, so that the lining of the swing chute reached a stable, heat-resistant and wear-resistant state, extending the service life of the swing chute. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the device of the utility model embodiment;

[0018] Figure 2 for Figure 1 Left view of;

[0019] Figure 3 for Figure 1 A top view of

[0020] Figure 4 This is a schematic diagram of the baking burner structure in the embodiment of the utility model;

[0021] Figure 5 This is a structural schematic diagram of a first embodiment of the combustion-supporting air of the utility model;

[0022] Figure 6 This is a structural schematic diagram of the second embodiment of the combustion-supporting air of the utility model;

[0023] Figure 7 It is a schematic diagram of the sleeve structure of the smoke exhaust pipe in the embodiment of the utility model.

[0024] In the figure: 1-combustion air main pipe, 2-smoke exhaust pipe, 3-gas branch pipe, 4-top baking device, 5-side baking device, 6-gas main pipe, 7-baking room, 8-combustion air branch pipe, 9-refractory spray material, 11-frequency conversion blower, 12-control box, 13-air guide, 14-baking burner, 15-metal core, 16-throttle plate, 17-swinging nozzle, 18-trolley, 19-electrically controlled gas valve, 20-electrically controlled air valve. DETAILED DESCRIPTION

[0025] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0027] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.

[0028] See Figure 1-3 , is a schematic diagram of the structure of an embodiment of a blast furnace swing nozzle baking device of the utility model, comprising a gas main pipe 6, a gas branch pipe 3, a combustion air main pipe 1, a combustion air branch pipe 8 and a baking burner 14, the gas main pipe 6 is connected to the multi-way gas branch pipe 3, the combustion air main pipe 1 is connected to the multi-way combustion air branch pipe 8, the device also includes a baking room 7 with an opening on the front side, the baking room 7 is provided with a top baking device 4 and a side baking device 5 on the left and right sides and the top side, each baking device is an independent gas mixing chamber, the outer side of the gas mixing chamber is connected to the gas branch pipe 3 and the combustion air branch pipe 8 respectively, the inner plane area of ​​the gas mixing chamber is provided with a plurality of baking burners 14 in a matrix, and the inner surface of the arc-shaped groove corresponding to the swing nozzle 17 is also provided with a plurality of sunken baking burners 14 in a contoured manner. A smoke exhaust pipe 2 is provided on the top of the baking room 7, and the smoke exhaust pipe 2 is connected to the workshop smoke main pipe through a pipeline.

[0029] The gas branch pipe 3 and the combustion air branch pipe 8 are three-way, corresponding to the top side and the left and right sides of the baking room 7 respectively. The baking burner 14 used is an ignition jet burner. Figure 4 The baking burner 14 is composed of a metal core 15 and a throttle plate 16, wherein the throttle plate 16 is uniformly adjusted and controlled. The baking burner 14 can realize uniform ignition under the signal control of the control box 12, and the mixed gas passes through the baking burner 14 and is electronically ignited to uniformly burn the refractory.

[0030] The swinging nozzle 17 enters and exits the baking room 7 through the front opening by a trolley 18 via a track. In order to ensure that the baking process can be accurately controlled, a plurality of temperature probes are arranged on the surface of the swinging nozzle 17, and the temperature probes are connected to the control box 12 through cables. The control box 12 is respectively connected to the electric control gas valve 19 on the gas main pipe 6 and the electric control air valve 20 on the combustion air main pipe 1 through cables. The control box 12 is provided with a display screen to display multiple temperatures.

[0031] See Figure 5 , which is a structural schematic diagram of a first embodiment of the combustion-supporting air of the utility model, a variable frequency blower 11 is provided on the combustion-supporting air main pipe 1, and the variable frequency blower 11 transports the combustion-supporting air into the baking room 7.

[0032] See Figure 6 , is a schematic diagram of the structure of the second embodiment of the combustion-supporting air of the utility model. An air guider 13 is provided on the combustion-supporting air main pipe 1. The compressed air inlet pipe and the natural air inlet pipe are respectively connected to the air guider 13. The compressed air inlet pipe forms a vacuum in the air guider 13, sucks in natural air, and delivers the combustion-supporting air to the baking room 7. Since the combustion-supporting air in the baking process must meet the pressure injection requirements, the air guider 13 uses the compressed air on site to enter from the guide port to complete the drainage of natural air, and mixes in the air guider 13 to generate pressurized gas that enters the combustion-supporting air main pipe 1. The combustion process is the same as that of the first embodiment.

[0033] The utility model is a method for baking a swinging spout of a blast furnace. When the method is implemented, a baking room 7 is first built in the iron-making yard of the blast furnace, and then the swinging spout 17 with refractory materials built is pushed into the baking room 7 via a track. The control system adjusts the flow of gas and combustion-supporting air into the baking room 7. The mixed gas is ignited and burned under the action of the igniter, and the swinging spout 17 is baked. The baking is completed in the baking room 7 according to the refractory baking curve. The baking method adopts three-way synchronous multi-flow diffusion. When working, after the swinging spout 17 is sent into the baking room 7 by the trolley 18, the arc groove of the swinging spout 17 is evenly spaced from the baking burner 14 and fixed with a latch. After the baking is completed, the latch is removed, and the trolley 18 can send the swinging spout 17 out. The combustion media used in the baking room 7 all use the gas and air provided on site, and no additional pipelines are connected. Refractory detection instruments and ignition devices are set inside the baking room 7 to prevent malfunctions of the baking facilities and gas leakage accidents, and necessary protection and alarm devices are set. In order to ensure that the flame does not go out during the baking process, a flame detection device is designed in the baking room; in order to ensure that the swinging nozzle refractory can be heated according to the refractory baking curve, a temperature detection device is designed in the refractory.

[0034] See Figure 7 In order to utilize heat energy, the smoke exhaust pipe 2 of the baking room 7 can also preheat the combustion air through a sleeve form.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blast furnace swing nozzle baking device, comprising a gas main pipe, a gas branch pipe, a combustion air main pipe, a combustion air branch pipe and a baking burner, wherein the gas main pipe is connected to multiple gas branches, and the combustion air main pipe is connected to multiple combustion air branches, characterized in that: The device also includes a baking room with an opening on the front side, and baking devices are respectively arranged on the left and right sides and the top side of the baking room. Each baking device is an independent gas mixing chamber. The outer sides of the gas mixing chamber are respectively connected to the gas branch pipe and the combustion air branch pipe. The inner plane area of ​​the gas mixing chamber is provided with multiple baking burners distributed in a matrix, and a number of sunken baking burners are also distributed in a contour corresponding to the inner surface of the arc-shaped groove of the swinging nozzle.

2. A blast furnace swing nozzle baking device according to claim 1, characterized in that: The gas branch pipe and the combustion air branch pipe are three-way, corresponding to the top side and the left and right sides of the baking room respectively, and the baking burner used is an ignition jet burner.

3. A blast furnace swing nozzle baking device according to claim 1, characterized in that: The swinging spout is driven by a trolley through a track to enter and exit the baking room from the front opening.

4. A blast furnace swing nozzle baking device according to claim 1, characterized in that: A smoke exhaust pipe is arranged on the top of the baking room, and the smoke exhaust pipe is connected with the main smoke pipe of the workshop through a pipeline.

5. The blast furnace swing nozzle baking device according to claim 1, characterized in that: A plurality of temperature measuring probes are arranged on the surface of the swinging spout, and the temperature measuring probes are connected to a control box through cables. The control box is respectively connected to the electric control valves on the gas main and the combustion air main through cables. A display screen is provided on the control box to display multiple temperatures.

6. A blast furnace swing nozzle baking device according to claim 1, characterized in that: The combustion-supporting air main pipe is provided with a variable frequency fan or an air flow guider, and the air flow guider is respectively connected to a compressed air inlet pipe and a natural air inlet pipe.

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