Hot blast stove with hot blast outlet in top

Abstract

The utility model relates to a hot-blast stove with a hot-blast outlet at the top, which can effectively solve the problems that the hot-blast outlet of the existing blast furnace top combustion type hot-blast stove is easy to damage and high in cost, and adopts the technical scheme that the hot-blast outlet is arranged at the top of a stove body, is vertical to the stove body and is communicated with a combustion chamber; an air inlet is formed in the outer wall of the combustion chamber horn mouth part and communicated with an air loop in the wall of the combustion chamber horn mouth part, a coal gas loop is arranged in the wall of the combustion chamber straight section part, a combustor is installed in an inner cavity, and the combustor is composed of four rows of upper and lower annular nozzles arranged on the inner side wall of the wall of the combustion chamber straight section part. The top combustion type hot blast stove is novel in structure and reasonable in design, the top outlet structure is adopted, the hole diameter of the checker brick is reduced, cost and energy can be saved, the nozzles with different angles can enable a flow field to be evenly distributed, and the top combustion type hot blast stove is an innovation of the top combustion type hot blast stove.

Description

Technical Field

[0001] The utility model relates to the field of hot blast stoves, in particular to a hot blast stove with a hot blast outlet arranged on the top. Background Art

[0002] At present, the hot air outlets of dozens of existing top-burning hot blast furnaces are all set at the straight wall at the bottom of the conical arch foot. There are also four-section types that divide the conical arch structure and the hot air outlet structure set at the bottom into two. No matter which hot blast furnace outlet structure is used, after several years of use, due to stress concentration, refractory fatigue, and furnace shell fatigue, the hot air outlet combined brick part is damaged and leaks, and finally collapses. At the same time, since the hot air outlet is set on the side wall of the combustion chamber, the huge pressure of the air supply and the high-temperature airflow have a great influence on the stability of the hot air outlet structure.

[0003] At present, the diameter of the heat storage chamber of the hot blast stove is relatively small. When the heat storage and heat exchange design capacity needs to be achieved, the heat storage body stacking height is relatively high, and the height of the hot blast stove will increase accordingly. If the hot air outlet is set at the top of the hot blast stove, the hot blast stove and the hot air outlet branch pipe and the main pipe will remain high, which requires a higher frame to support the main pipe and valve. The higher the frame, the larger the main frame and crossbeam of the frame that needs to support the load, and the heavier the weight, resulting in increased investment. If the height of the heat storage body is reduced and the diameter of the heat storage chamber is increased, then under the condition of sufficient heat storage body weight and heat exchange area, the hot blast stove flue gas flow field will be unevenly distributed, the cold air flow field will be unevenly distributed, the utilization rate of the checker bricks will be low, the wind temperature will be reduced, or the energy consumption will increase. These technical problems need to be solved urgently to further increase the wind temperature, reduce consumption, reduce investment, and extend the life of the hot blast stove. Therefore, the improvement and innovation of the blast furnace top-fired hot blast stove is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the above situation, in order to solve the defects of the prior art, the purpose of the utility model is to provide a hot blast furnace with a hot blast outlet on the top, which can effectively solve the problem that the hot blast outlet of the existing blast furnace top-fired hot blast furnace is easily damaged and has high cost.

[0005] The technical solution solved by the utility model is that it comprises a furnace body, a hot air outlet is arranged on the top of the furnace body, the hot air outlet is perpendicular to the furnace body, the hot air outlet is connected with a combustion chamber, an air inlet is arranged on the outer wall of the bell mouth part of the combustion chamber, the air inlet is connected with an air ring channel in the wall of the bell mouth part of the combustion chamber, a gas ring channel is arranged in the wall of the straight section part of the combustion chamber, a burner is installed in the inner cavity, the burner is composed of four rows of upper and lower annular nozzles arranged on the inner wall of the straight section part of the combustion chamber wall, a gas inlet is arranged on the outer wall of the straight section part of the combustion chamber wall, the combustion chamber is connected with a heat storage chamber arranged thereunder, checkered bricks are laid in the heat storage chamber, and the heat storage chamber is connected with a cold air chamber arranged thereunder.

[0006] The utility model has novel structure and reasonable design, adopts top outlet structure and reduces the aperture of checkered bricks, can save cost and energy, and nozzles at different angles can make the flow field evenly distributed, combustion sufficient, good use effect, strong practicality, can achieve long life, energy saving and high wind temperature, and is an innovation in top-burning hot blast furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model.

[0008] Figure 2 For this utility model Figure 1 AA cross-section diagram of .

[0009] Figure 3 For this utility model Figure 1 Schematic diagram of the BB cross section.

[0010] Figure 4 For this utility model Figure 1 Schematic diagram of CC cross section.

[0011] Figure 5 For this utility model Figure 1 Schematic diagram of DD cross section. DETAILED DESCRIPTION

[0012] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0013] Depend on Figure 1-5 The utility model includes a furnace body, a hot air outlet 1 is arranged on the top of the furnace body 7, the hot air outlet 1 is perpendicular to the furnace body 7, the hot air outlet 1 is connected to the combustion chamber, an air inlet 2 is arranged on the outer wall of the bell-mouth part of the combustion chamber, the air inlet 2 is connected to the air ring 4 in the wall of the bell-mouth part of the combustion chamber, a gas ring 5 is arranged in the wall of the straight section of the combustion chamber, a burner is installed in the inner cavity, the burner is composed of four rows of upper and lower annular nozzles 61, 62, 63, 64 arranged on the inner wall of the straight section of the combustion chamber, a gas inlet 3 is arranged on the outer wall of the straight section of the combustion chamber, the combustion chamber is connected to the heat storage chamber arranged thereunder, checkered bricks 10 are laid in the heat storage chamber, and the heat storage chamber is connected to the cold air chamber arranged thereunder.

[0014] In order to ensure the use effect, a manhole 8 is arranged on the outer wall of one side of the cold air chamber, and a cold air inlet / flue outlet 9 is arranged on the other side.

[0015] The heat storage chamber has a height of 11-13m.

[0016] The pore diameter of the checkered brick is greater than 15 mm and less than 20 mm.

[0017] The four upper and lower rows of annular nozzles 61 , 62 , 63 , 64 are connected to the air annular channel 4 and the gas annular channel 5 via the air branch pipe 41 and the gas branch pipe 51 respectively.

[0018] The air annular channels 4 are arranged at equal intervals, and the number thereof matches the number of the four upper and lower rows of annular nozzles 61 , 62 , 63 , 64 .

[0019] The first row of nozzles 61 are straight spray holes perpendicular to the central axis of the burner, the second row of nozzles 62 are spray holes with a rotary cutting angle of 8-20° to the central axis, the third row of nozzles 63 are spray holes with a rotary cutting angle of 10-30° to the central axis, and the fourth row of nozzles 64 are spray holes with a rotary cutting angle of 20-40° to the central axis.

[0020] Furthermore, the second row of nozzles 62 are spray holes with a rotary cutting angle of 5-15° to the central axis, the third row of nozzles 63 are spray holes with a rotary cutting angle of 15-25° to the central axis, and the fourth row of nozzles 64 are spray holes with a rotary cutting angle of 25-30° to the central axis.

[0021] The use of the utility model is to reduce the height of the heat storage chamber from more than 20 meters in the past to about 12 meters, and the aperture of the checkered brick is reduced from the original 25-30 mm to less than 20 mm. The diameter must be increased, but the column flow multi-rotation technology and the hole-interconnected checkered brick technology must be used to implement the self-regulation of the flue gas flow field and the cold air flow field. By setting the top outlet in this way, the total height can be reduced by about 10 meters compared with the above-mentioned top setting of the hot air outlet, and all investments will be greatly reduced.

[0022] At the same time, small-aperture lattice bricks are used and the diameter is increased to meet the heat storage and heat exchange performance quota. At the same time, the height of the lattice bricks is reduced, the load-bearing capacity of the lattice bricks is reduced, the probability of blockage is reduced, and the life of the lattice bricks is doubled. On the other hand, the height of the lattice bricks is reduced, the resistance to smoke and cold air is reduced, and the power consumption of air supply is reduced. Therefore, the gas and air are mixed in the nozzle channel and then sprayed out to quickly ignite.

[0023] Finally, 1-N rows of nozzles at various angles are provided, which can make the flue gas flow field evenly distributed and the combustion sufficient. When supplying air, the high-temperature airflow at the top outlet is used, so the airflow is evenly distributed in the checker bricks. In addition, the checker brick structure with interconnected holes can help improve the utilization rate of the checker bricks, improve efficiency and wind temperature, reduce the height of the hot blast furnace system, reduce investment, stabilize the structure, and achieve long life, energy saving and high wind temperature.

[0024] The utility model has a novel structure and a reasonable design. It adopts a top outlet structure and a reduced lattice brick aperture, which can save cost and energy. The nozzles at different angles can make the flow field evenly distributed and the combustion sufficient, which significantly improves the efficiency and wind temperature. It has a good use effect and is highly practical. It can achieve long life, energy saving and high wind temperature. It is an innovation in top-burning hot blast furnaces and has good economic and social benefits.

[0025] It should be pointed out that the above is only a preferred embodiment of the utility model, and does not impose any form of limitation on the utility model. Any technician familiar with the profession can use the technical content disclosed above to make changes or modify it into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model, which all fall within the protection scope of the utility model.

Claims

1. A hot air furnace with a hot air outlet at the top, comprising a furnace body, characterized in that: A hot air outlet (1) is arranged on the top of the furnace body (7), the hot air outlet (1) is oriented perpendicularly to the furnace body (7), the hot air outlet (1) is connected to the combustion chamber, an air inlet (2) is arranged on the outer wall of the bell mouth portion of the combustion chamber, the air inlet (2) is connected to an air ring channel (4) in the wall of the bell mouth portion of the combustion chamber, a gas ring channel (5) is arranged in the wall of the straight section portion of the combustion chamber, a burner is installed in the inner cavity, the burner is composed of four rows of annular nozzles arranged on the inner side wall of the straight section portion of the combustion chamber, namely, a first row of nozzles (61), a second row of nozzles (62), a third row of nozzles (63), and a fourth row of nozzles (64), a gas inlet (3) is arranged on the outer wall of the straight section portion of the combustion chamber, the combustion chamber is connected to a heat storage chamber arranged below it, the heat storage chamber is built with checker bricks (10), and the heat storage chamber is connected to a cold air chamber arranged below it.

2. The hot air furnace with a hot air outlet at the top according to claim 1, characterized in that: A manhole (8) is provided on one side of the outer wall of the cold air chamber, and a cold air inlet / flue outlet (9) is provided on the other side.

3. The hot air stove with a hot air outlet at the top according to claim 1, characterized in that: The heat storage chamber has a height of 11-13m.

4. The hot air stove with a hot air outlet at the top according to claim 1, characterized in that: The pore diameter of the checkered brick is greater than 15 mm and less than 20 mm.

5. The hot air furnace with a hot air outlet at the top according to claim 1, characterized in that: The first row of nozzles (61), the second row of nozzles (62), the third row of nozzles (63) and the fourth row of nozzles (64) of the four upper and lower rows of annular nozzles are connected to the air annular channel (4) and the gas annular channel (5) respectively via the air branch pipe (41) and the gas branch pipe (51).

6. The hot air stove with a hot air outlet at the top according to claim 1, characterized in that: The air annular channels (4) are arranged at equal intervals, and the number thereof matches the number of the first row of nozzles (61), the second row of nozzles (62), the third row of nozzles (63), and the fourth row of nozzles (64) of the upper and lower four rows of annular nozzles.

7. The hot air furnace with a hot air outlet at the top according to claim 1, characterized in that: The first row of nozzles (61) are straight spray holes perpendicular to the central axis of the burner, the second row of nozzles (62) are spray holes with a rotary cutting angle of 8-20° to the central axis, the third row of nozzles (63) are spray holes with a rotary cutting angle of 10-30° to the central axis, and the fourth row of nozzles (64) are spray holes with a rotary cutting angle of 20-40° to the central axis.

8. The hot air furnace with a hot air outlet at the top according to claim 7, characterized in that: Furthermore, the second row of nozzles (62) are spray holes with a rotary cutting angle of 5-15° to the central axis, the third row of nozzles (63) are spray holes with a rotary cutting angle of 15-25° to the central axis, and the fourth row of nozzles (64) are spray holes with a rotary cutting angle of 25-30° to the central axis.

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