Rotational flow and axial flow double-mixed ball type hot blast stove combustion device

Abstract

The utility model discloses a rotational flow and axial flow double-mixed ball type hot blast stove combustion device which comprises a first gas guide pipe and a second gas guide pipe which are detachably connected, and the first gas guide pipe and the second gas guide pipe are connected with a first gas inlet end and a second gas inlet end respectively. The first gas guide pipe and the second gas guide pipe form a ball type hot blast stove combustion channel, a ball type hot blast stove combustion structure is arranged at the front end of the ball type hot blast stove combustion channel, and axial flow and rotational flow gas are generated through the ball type hot blast stove combustion structure to form vortex mixing for combustion. According to the utility model, rotational flow gas and axial flow air are fully mixed and combusted to form a rotational flow gas jet combustion device. The mixing degree between gas and air is improved through gas jet flow rotational flow optimization, the gas and the air are better mixed, and the obvious effects of increasing the hot air temperature, reducing the consumption of furnace burning gas, prolonging the service life of the hot blast stove and the like are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace ironmaking, and in particular relates to a spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow. Background Art

[0002] With the continuous development of blast furnace ironmaking production technology, blast furnaces are constantly being smelted and strengthened, which requires higher air supply temperature. Increasing the air supply temperature can not only promote intensified smelting, but also reduce the coke ratio, which can not only contribute to national and local energy conservation and emission reduction, but also increase the profit margin for enterprises, achieving a win-win situation for all parties, and its economic benefits, social benefits and environmental benefits are very significant.

[0003] In the prior art, blast furnace ironmaking production uses the traditional external metal sleeve burner of the spherical hot blast furnace. The existing metal sleeve burner is an outdated technology with low combustion heat utilization, uneven mixing of coal gas and combustion air, high excess air coefficient, disordered airflow organization, low combustion efficiency and other disadvantages. Secondly, due to the irregular combustion process on the upper surface of the regenerator, the regenerators are adhered to each other and blocked by ash accumulation. As the air supply pressure difference gradually increases, the service life is shortened, which affects the hot blast furnace gas consumption, the service life of the regenerator and the use of blast furnace air temperature, resulting in an increase in the cost of molten iron manufacturing, which cannot meet the company's own development.

[0004] In view of the above factors, a spherical hot blast furnace combustion device with double mixing of swirl and axial flow is specially designed. The gas jet swirl will improve the mixing degree between gas and air, and the gas and air are better mixed, which improves the overall combustion effect. The swirl and axial flow double mixing burner has obvious effects in increasing the hot air temperature, reducing the gas consumption of furnace burning, and extending the service life of the hot blast furnace. Utility Model Content

[0005] The utility model aims to provide a spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow, so as to solve the problems raised in the above background technology.

[0006] The purpose of the utility model is achieved through the following technical solutions: a spherical hot blast furnace combustion device with double mixing of swirl and axial flow, comprising a first air guide pipe and a second air guide pipe, wherein the first air guide pipe and the second air guide pipe are connected in a detachable manner, and the first air guide pipe and the second air guide pipe are respectively connected to a first air inlet end and a second air inlet end;

[0007] The first air guide pipe and the second air guide pipe form a spherical hot blast furnace combustion channel, and a spherical hot blast furnace combustion structure is arranged at the front end of the spherical hot blast furnace combustion channel. The spherical hot blast furnace combustion structure generates axial flow and swirl gas to form a vortex mixture and then burn.

[0008] Furthermore, the detachable connection between the first air duct and the second air duct includes a bolt connection.

[0009] Furthermore, the spherical hot blast furnace combustion structure includes a gas cyclone, which is arranged at the front end of the second air guide pipe, an axial flow channel is arranged outside the gas cyclone, and a plurality of air axial flow holes are arranged on the end surface of the axial flow channel;

[0010] The center of the coal gas cyclone is a central wind channel.

[0011] Furthermore, the second air guide tube is a sandwich casing, the center of the second air guide tube is a gas channel, and the gas channel is in a cone shape;

[0012] An air flow channel is formed between the gas channel and the inner wall of the second air guide pipe.

[0013] Furthermore, the air axial flow holes are arranged along the circumference of the end surface of the second air guide pipe.

[0014] Furthermore, the air axial flow hole is disposed between swirl blades connected to the coal gas cyclone.

[0015] Furthermore, the length of the coal gas cyclone located in the second air guide pipe is 20-30 centimeters.

[0016] Furthermore, the first air inlet end and the second air inlet end are respectively connected to an external air pipeline and a gas pipeline in a detachable manner.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model sprays out the burner at high speed to form a jet when the surrounding space is limited. The combustion speed of the fully mixed gas is no longer limited by physical conditions such as the gas diffusion speed. The combustion speed is faster, the combustion is more complete, and the flame temperature is higher. The utility model adopts swirl gas and axial flow air to fully mix and burn, forming a swirl gas jet combustion device. The optimization of the gas jet swirl will improve the mixing degree between the gas and the air, and the gas and the air are better mixed, resulting in rapid combustion, a sharp increase in the centerline temperature, and a stable flame, which improves the overall combustion effect. Production practice has proved that the swirl and axial flow dual mixing burner has a stable structure and flexible form, and has obvious effects in increasing the hot air temperature, reducing the consumption of furnace gas, and extending the service life of the hot blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall connection of the utility model;

[0020] Figure 2It is a plan view of the combustion structure of the spherical hot blast furnace of the utility model. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figure 1-2 As shown, a spherical hot blast furnace combustion device with double mixing of swirl and axial flow comprises a first air guide pipe 1 and a second air guide pipe 2, wherein the first air guide pipe 1 and the second air guide pipe 2 are connected in a detachable manner, and the first air guide pipe 1 and the second air guide pipe 2 are respectively connected to a first air inlet end 3 and a second air inlet end 4;

[0025] The first air guide tube 1 and the second air guide tube 2 form a spherical hot blast furnace combustion channel, and a spherical hot blast furnace combustion structure is arranged at the front end of the spherical hot blast furnace combustion channel. The spherical hot blast furnace combustion structure generates axial flow and swirl gas to form a vortex mixture and then burn.

[0026] The first air duct 1 and the second air duct 2 form a spherical hot blast furnace combustion channel and are connected to the hot blast furnace. The first air duct 1 and the second air duct 2 are respectively provided with connecting flanges at both ends, wherein the flange at one end of the first air duct 1 is connected to the blocking end, and the flange at one end of the second air duct 2 is connected to the hot blast furnace.

[0027] In order to facilitate detachable replacement and maintenance during use, the detachable connection between the first air duct 1 and the second air duct 2 includes a bolt connection.

[0028] In order to improve the mixing degree between gas and air by optimizing the gas jet swirl flow in the use state, the spherical hot blast furnace combustion structure includes a gas cyclone 6, and the length of the gas cyclone 6 located in the second air guide pipe 2 is 20-30 cm; the gas cyclone 6 is arranged at the front end of the second air guide pipe 2, and an axial flow channel is arranged outside the gas cyclone 6, and a plurality of air axial flow holes 7 are arranged on the end surface of the axial flow channel;

[0029] The center of the coal gas cyclone 6 is a central wind channel 9 .

[0030] In order to facilitate the formation of a jet effect in the use state, the second air guide tube 2 is a sandwich sleeve, the center of the second air guide tube 2 is a gas channel, and the gas channel is in a cone shape;

[0031] An air flow channel 8 is formed between the gas channel and the inner wall of the second air duct 2 , and the air flow channel 8 is closed near the first air duct 1 .

[0032] In order to facilitate the formation of a replacement axial flow mixing effect during use and thus play a role in assisting combustion, the air axial flow holes 7 are arranged along the circumference of the end surface of the second air guide pipe 2, and the air axial flow holes 7 are arranged between the swirl blades connected to the coal gas cyclone 6.

[0033] The first air inlet end 3 and the second air inlet end 4 are respectively connected to an external air pipeline and a gas pipeline in a detachable manner.

[0034] When the hot blast furnace is burning, air enters from the air sleeve and coal gas enters from the coal gas sleeve. The air and coal gas pass through the air axial flow hole and the coal gas cyclone at the front end of the burner respectively, and the air axial flow and coal gas cyclone are generated to form a vortex mixture and then burn. The mixed gas and air are ejected out of the burner at a high speed to form a jet under the condition that the surrounding space is limited. The combustion speed of the fully mixed gas is no longer limited by physical conditions such as the gas diffusion speed. The combustion speed is faster, the combustion is more complete, and the flame temperature is higher. The utility model adopts swirl coal gas and axial flow air to fully mix and burn to form a swirl gas jet combustion device. The optimization of the coal gas jet swirl will improve the mixing degree between coal gas and air, and the coal gas and air are better mixed, thereby leading to rapid combustion, a sharp increase in the centerline temperature, and a stable flame, which improves the overall combustion effect. Production practice has proved that the swirl and axial flow double mixing burner has a stable structure and flexible form, and has obvious effects in increasing the hot air temperature, reducing the coal gas consumption of the furnace, and extending the service life of the hot blast furnace.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow, characterized in that: The invention comprises a first air duct (1) and a second air duct (2), wherein the first air duct (1) and the second air duct (2) are connected in a detachable manner, and the first air duct (1) and the second air duct (2) are respectively connected to a first air inlet end (3) and a second air inlet end (4); The first air guide pipe (1) and the second air guide pipe (2) form a spherical hot blast furnace combustion channel, and a spherical hot blast furnace combustion structure is arranged at the front end of the spherical hot blast furnace combustion channel. The spherical hot blast furnace combustion structure generates axial flow and swirl gas to form a vortex mixture and then burn.

2. The spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow according to claim 1 is characterized in that: The detachable connection between the first air guide pipe (1) and the second air guide pipe (2) comprises a bolt connection.

3. The spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow according to claim 2 is characterized in that: The spherical hot blast furnace combustion structure comprises a coal gas cyclone (6), the coal gas cyclone (6) is arranged at the front end of the second air guide pipe (2), an axial flow channel is arranged outside the coal gas cyclone (6), and a plurality of air axial flow holes (7) are arranged on the end surface of the axial flow channel; The center of the coal gas cyclone (6) is a central wind channel (9).

4. The spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow according to claim 3 is characterized in that: The second air guide tube (2) is a sandwich casing, the center of the second air guide tube (2) is a gas channel, and the gas channel is in a cone shape; An air flow channel (8) is formed between the coal gas channel and the inner wall of the second air guide pipe (2).

5. The spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow according to claim 4 is characterized in that: The air axial flow holes (7) are arranged along the circumference of the end surface of the second air guide pipe (2).

6. The spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow according to claim 5 is characterized in that: The air axial flow hole (7) is arranged between the swirl blades connected to the coal gas cyclone (6).

7. The spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow according to claim 6 is characterized in that: The length of the coal gas cyclone (6) located in the second air guide pipe (2) is 20-30 centimeters.

8. The spherical hot blast furnace combustion device with double mixing of swirl flow and axial flow according to claim 7 is characterized in that: The first air inlet end (3) and the second air inlet end (4) are respectively connected to an external air pipeline and a gas pipeline in a detachable manner.

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