CN214400600U - Hot air pipeline structure of hot blast stove - Google Patents

Abstract

The utility model relates to a hot-blast furnace hot-blast duct structure, including hot-blast furnace body and hot-blast pipeline, hot-blast pipeline includes the hot-blast branch pipe that sets up with the hot-blast furnace body intercommunication, the hot-blast house steward that sets up with the hot-blast branch pipe intercommunication and the hot-blast standpipe that sets up with the hot-blast house steward intercommunication, hot-blast house steward is located the top of hot-blast branch pipe, be provided with the elbow pipe that feeds through both between hot-blast branch pipe and the hot-blast house steward, the elbow pipe is the excessive perpendicular return bend of 90 degrees arcs, all be provided with resistant firebrick in the hot-blast pipeline, the middle part intercommunication setting of hot-blast standpipe and hot-blast house steward. The problem of original level three-way position multi-direction displacement uneven and the weak problem of top atress has been solved in this application, makes hot-blast house steward and hot-blast branch connection stable and inside resistant firebrick be difficult for collapsing, guarantees hot-blast not cross the wind, and the tube is not reddened, has prolonged the life of hot-blast house steward and hot-blast branch pipe greatly.

Description

Hot air pipeline structure of hot blast stove

Technical Field

The application relates to the field of hot blast stoves, in particular to a hot blast pipeline structure of a hot blast stove.

Background

In blast furnace iron making, blast air is heated by a hot blast stove for nearly two hundred years, and the air temperature is only 149 ℃ initially after heating. With the continuous progress of the technology, the wind temperature reaches 1350 ℃ at most at present. The air temperature is improved, the coke ratio can be greatly reduced, coke is saved, the output of the blast furnace is improved, the blast furnace gas with low calorific value can be fully utilized, the heat efficiency is improved, the gas emission is reduced, the energy is saved, and the environment is protected.

The hot-blast furnace body bottom and the hot-blast standpipe of top combustion formula hot-blast furnace are fixed setting, and the hot-blast furnace body is heated axial and radial expansion, and hot-blast branch pipe and hot-blast furnace body are in the state of linking to each other perpendicularly, and after the hot-blast furnace body heaies up, along with hot-blast furnace body operating condition's alternation (air supply-burning, burning-air supply), then the ripple compensator that establishes on the hot-blast branch pipe needs the lateral displacement of absorbing the branch pipe simultaneously and because the hot-blast furnace body is heated the longitudinal displacement to its production.

In view of the above-mentioned related technologies, the inventor found that the refractory material inside the hot-blast branch pipe cannot absorb and compensate the lateral and longitudinal displacements of the corrugated compensator well, the refractory material structure of the working layer is unstable and blows wind, and the light insulating brick and the hot-blast branch pipe compound compensator are burnt out, thereby causing damage to the hot-blast branch pipe.

Disclosure of Invention

In order to improve the life of hot-blast branch pipe, this application provides a hot-blast pipeline structure of hot-blast furnace.

The application provides a hot-blast furnace hot-blast pipeline structure adopts following technical scheme:

the utility model provides a hot-blast furnace hot-blast duct structure, includes hot-blast furnace body and hot-blast pipeline, hot-blast pipeline include with hot-blast branch pipe that hot-blast furnace body intercommunication set up, with the hot-blast house steward that hot-blast branch pipe intercommunication set up and with the hot-blast standpipe that hot-blast house steward intercommunication set up, hot-blast house steward is located the top of hot-blast branch pipe, be provided with the elbow pipe that communicates both between hot-blast branch pipe and the hot-blast house steward, the elbow pipe is the excessive perpendicular return bend of 90 degrees arcs, all be provided with resistant firebrick in the hot-blast pipeline.

Through adopting above-mentioned technical scheme, realize the intercommunication through the elbow pipe between hot-blast house steward and the hot-blast branch pipe, the natural compensation function of make full use of elbow pipe self cancels the compensator on the hot-blast branch pipe, has solved the uneven and weak problem of top atress of multi-direction displacement at original level three-way position, makes the stable and inside resistant firebrick of hot-blast house steward and hot-blast branch pipe connection be difficult for collapsing, guarantees hot-blast not cross the wind, and the tube is not reddened, has prolonged the life of hot-blast house steward and hot-blast branch pipe greatly.

Preferably, the refractory bricks comprise light clay bricks, light high-alumina bricks and low-creep high-alumina bricks which are sequentially arranged from the inner peripheral wall of the elbow pipe to the axial direction.

By adopting the technical scheme, the light clay brick and the light high-alumina brick have the characteristics of light weight and good thermal shock resistance, can bear the temperature of not higher than 1350 ℃, and the low-creep high-alumina brick is advanced refractory extension and can bear 1750-1790 ℃, so that the heat insulation effect of the refractory brick is ensured.

Preferably, the refractory bricks are arranged in a Z shape.

By adopting the technical scheme, the hot air pipeline refractory brick adopts a Z-shaped design, so that a good circumferential sealing airflow effect can be achieved, the rings at the turning positions of the single bricks are buckled and mutually supported, and the structure is more stable.

Preferably, the inner peripheral wall of the hot air pipeline is coated with a heat-insulating and high-temperature-resistant coating layer.

By adopting the technical scheme, the temperature in the hot air pipeline is effectively prevented from being transmitted to the hot air pipeline due to the arrangement of the coating layer.

Preferably, a compressible ceramic fiber felt is arranged between the coating layer and the refractory bricks.

Through adopting above-mentioned technical scheme, ceramic fiber felt has light in weight, high temperature resistant, thermal stability is good, the heat conductivity is low, specific heat is little and advantages such as mechanical shock are resisted, and compressible ceramic fiber felt has certain elasticity, and the effectual condition that has reduced resistant firebrick thermal deformation and has appeared the crack takes place.

Preferably, the ceramic fiber felt is an arc-shaped felt, the central angle of the ceramic fiber felt is 120 degrees, and the ceramic fiber felt is positioned on the upper inner peripheral wall of the hot air pipeline.

Through adopting above-mentioned technical scheme, the ceramic fiber felt that is located the top can not receive resistant firebrick's pressure, the effectual elasticity of guaranteeing the ceramic fiber felt, if the ceramic fiber felt is located resistant firebrick's below, then the ceramic fiber felt can not play the effect of a buffering resistant firebrick deformation, needn't set up for this reason.

Preferably, the hot air vertical pipe is communicated with the middle part of the hot air main pipe.

Through adopting above-mentioned technical scheme, hot-blast standpipe and hot-blast main's middle part intercommunication not only can reduce the change of hot-blast standpipe both ends axial displacement, is favorable to reducing the hot-blast furnace periodic air supply expansion shrinkage problem moreover, has still reduced the blind plate power influence between hot-blast standpipe and the hot-blast main.

Preferably, the hot air main pipe is communicated with four hot air branch pipes, the hot air branch pipes are provided with hot air valves, and the circumference of the hot air main pipe is larger than that of the hot air branch pipes.

By adopting the technical scheme, in order to improve the hot air supply rate, the four hot air branch pipes are arranged, and the two hot air branch pipes are always ensured to be in an air supply state, so that the flow of the hot air main pipe is larger than that of the hot air branch pipes, the circumference of the hot air main pipe is larger than that of the hot air branch pipes, the conveying efficiency of the hot air main pipe is ensured, and the pressure inside the hot air main pipe is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the hot air main pipe and the hot air branch pipes are communicated through the elbow pipes, the natural compensation function of the elbow pipes is fully utilized, a compensator on the hot air branch pipes is omitted, the problems of uneven multi-directional displacement and weak top stress of an original horizontal three-way intersection are solved, the hot air main pipe and the hot air branch pipes are stably connected, refractory bricks in the hot air main pipe and the hot air branch pipes are not easy to collapse, hot air is prevented from crossing, pipe shells are prevented from glowing, and the service lives of the hot air main pipe and the hot air branch pipes are greatly prolonged;

2. the hot air vertical pipe is communicated with the middle of the hot air main pipe, so that the axial displacement change of two ends of the hot air vertical pipe can be reduced, the problem of the expansion and contraction of periodic air supply of the hot air furnace is favorably reduced, and the influence of blind plate force between the hot air vertical pipe and the hot air main pipe is also reduced.

Drawings

Fig. 1 is an overall view of an embodiment of the present application.

FIG. 2 is a cross-sectional view of a hot air duct of the present application with an elbow pipe removed.

Figure 3 is a cross-sectional view of an elbow conduit in an embodiment of the present application.

Description of reference numerals: 1. a hot blast stove body; 2. a hot air duct; 3. a hot air branch pipe; 4. a hot air main pipe; 5. a hot air vertical pipe; 6. an elbow pipe; 7. a refractory brick; 71. light clay brick; 72. light high-alumina bricks; 73. low creep high alumina brick; 8. a coating layer; 9. a ceramic fiber mat; 10. a hot blast valve.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a hot air pipeline structure of a hot air furnace. Referring to fig. 1, the hot air duct 2 of the hot air furnace structurally comprises a hot air furnace body 1 and hot air ducts 2, wherein each hot air duct 2 comprises a hot air branch pipe 3, a hot air main pipe 4, an elbow pipe 6 and a hot air vertical pipe 5, the hot air branch pipes 3 are communicated with the hot air furnace body 1, the hot air furnace body 1 and the hot air branch pipes 3 are respectively provided with four elbow pipes 6 for respectively communicating and arranging the four hot air branch pipes 3 on the hot air main pipe 4, the elbow pipe 6 is provided with a 90-degree arc transition vertical elbow, one end of the elbow pipe 6 is communicated with the hot air branch pipes 3, the other end of the elbow pipe is communicated with the hot air main pipe 4, the hot air main pipe 4 is positioned above the hot air branch pipes 3, each hot air branch pipe 3 is provided with a hot air valve 10, the circumference of the hot air main pipe 4 is larger than the circumference of the hot air branch pipes 3, and two of the hot air furnace bodies 1 are in a combustion heating state, the other two hot blast stove bodies 1 are in an air supply state, hot air output is always kept in the hot air main pipe 4, one end of the hot air vertical pipe 5 is communicated with the header of the hot air main pipe 4, and a refractory brick 7 is arranged in each hot air pipeline 2 in combination with the graph 2.

As shown in fig. 2 and 3, the refractory brick 7 is a "zigzag" refractory brick 7, which can play a good role in circumferential sealing airflow, the loops at the inflection point of the single brick are buckled and supported with each other, and the structure is more stable, the refractory brick 7 comprises a light clay brick 71, a light high alumina brick 72 and a low creep deformation high alumina brick 73, the inner circumferential wall of the hot air duct 2 is coated with a coating layer 8, the coating is preferably a light spray coating CMG-LW1300, the light clay brick 71 is fixedly arranged on the inner circumferential wall of the coating layer 8, the light high alumina brick 72 is fixed on the inner circumferential wall of the light high alumina brick 71, and the low creep deformation clay brick 73 is fixedly arranged on the inner circumferential wall of the light high alumina brick 72, so as to form an inner protective layer of the hot air duct 2.

As shown in fig. 2 and fig. 3, a compressible ceramic fiber felt 9 is arranged between the paint layer 8 and the light clay brick 71, the ceramic fiber felt 9 is only arranged at the elbow pipe 6 as an annular felt, the other positions are all arranged as arc-shaped felts, the central angle of the arc-shaped felts is 120 degrees, and the arc-shaped felts are arranged at the upper end part of the inner peripheral wall of the hot air pipeline 2, the ceramic fiber felt 9 above cannot be pressed by the refractory brick 7, so that the elasticity of the ceramic fiber felt 9 is effectively ensured, if the ceramic fiber felt 9 is arranged below the refractory brick 7, the ceramic fiber felt 9 can be pressed by the refractory brick 7, and the ceramic fiber felt 9 cannot play a role of buffering the deformation of the refractory brick 7.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a hot-blast furnace hot-blast duct structure, includes hot-blast furnace body (1) and hot-blast duct (2), hot-blast duct (2) include hot-blast branch pipe (3) that set up with hot-blast furnace body (1) intercommunication, with hot-blast house steward (4) that hot-blast branch pipe (3) intercommunication set up and with hot-blast standpipe (5) that hot-blast house steward (4) intercommunication set up, its characterized in that: the hot air main pipe (4) is located above the hot air branch pipes (3), elbow pipes (6) for communicating the hot air branch pipes (3) and the hot air main pipe (4) are arranged between the hot air branch pipes (3) and the hot air main pipe (4), the elbow pipes (6) are 90-degree arc-shaped excessive vertical bent pipes, and refractory bricks (7) are arranged in the hot air pipeline (2).

2. The hot air duct structure of hot air stove according to claim 1, characterized in that: the refractory brick (7) comprises a light clay brick (71), a light high-alumina brick (72) and a low-creep high-alumina brick (73) which are sequentially arranged along the axial direction from the inner peripheral wall of the elbow pipe (6).

3. The hot air duct structure of hot air stove according to claim 2, characterized in that: the refractory bricks (7) are Z-shaped refractory bricks (7).

4. The hot air duct structure of hot air stove according to claim 2, characterized in that: the inner peripheral wall of the hot air pipeline (2) is coated with a coating layer (8).

5. The hot air duct structure of hot air stove according to claim 4, characterized in that: a compressible ceramic fiber felt (9) is arranged between the coating layer (8) and the refractory bricks (7).

6. The hot air duct structure of hot air stove according to claim 5, characterized in that: the ceramic fiber felt (9) is set to be an arc-shaped felt, the central angle of the ceramic fiber felt (9) is 120 degrees, and the ceramic fiber felt (9) is positioned on the upper inner peripheral wall of the hot air pipeline (2).

7. The hot air duct structure of hot air stove according to claim 1, characterized in that: the hot air vertical pipe (5) is communicated with the middle part of the hot air main pipe (4).

8. The hot air duct structure of hot air stove according to claim 1, characterized in that: the circumference of the hot air main pipe (4) is larger than that of the hot air branch pipe (3).

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