Uniform air supply device for blast furnace

Abstract

The utility model relates to a uniform air supply device of a blast furnace. The device comprises a hot air header pipe, a hot air collecting chamber, a hot air downcomer, a hot air bustle pipe and a hot air branch pipe, the hot air collecting chamber is of a hollow sphere structure; the other end of the hot air header pipe is connected with the top end of the sphere structure of the hot air collecting chamber; the hot air descending pipes are uniformly distributed in the circumferential direction of the same horizontal outer circle of the sphere structure of the hot air collecting chamber; one end of each hot air descending pipe is connected with the horizontal outer circle of the sphere structure of the hot air collecting chamber, the other end of each hot air descending pipe is connected with the hot air bustle pipe, and the hot air bustle pipe is equally divided into multiple areas by the multiple hot air descending pipes; the hot air branch pipes are uniformly distributed in a plurality of areas of the bustle pipe, one end of each hot air branch pipe is connected with the lower part of the bustle pipe, and the other end is provided with an air port for feeding hot air into the blast furnace. The device can solve the problem that when hot air flow provided by the hot air furnace is unstable, air distribution of all tuyeres of the blast furnace is not uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace air supply, in particular to a blast furnace uniform air supply device. Background Art

[0002] In the field of smelting, the blast furnace hot blast stove is an important system. Its main working principle is: the combustible gas is sent into the hot blast stove through the pipeline, and the combustible gas is used to burn the lattice bricks in the furnace to heat them. After the lattice bricks are heated, the combustion system is closed and cold air is sent in. The cold air is heated by the lattice bricks, and the temperature of the heated cold air reaches a certain temperature before it is sent to the blast furnace.

[0003] The existing blast furnace air supply system is to send the hot air generated by the hot blast stove into the hot blast surrounding pipe through the hot blast main pipe, and then divide it into two air flows to move along the circumference of the hot blast surrounding pipe, and then send the hot air into the blast furnace through the hot blast branch pipe and the tuyere.

[0004] However, during the production process, the hot blast furnace may be unstable, which will cause the hot air flow provided by the hot blast furnace to be unstable, and then make the air volume distribution at the blast furnace tuyere uneven, affecting the longevity and production efficiency of the blast furnace, and also causing energy waste.

[0005] The Chinese patent with application number 202210057854.8 provides a blast furnace uniform air supply device and method with an external flow control zone, the equipment includes a hot air surrounding pipe, the hot air surrounding pipe is connected to the hot air main pipe through the external flow control zone, a number of hot air branches are evenly arranged in the circumferential direction of the hot air surrounding pipe, the external flow control zone includes a direct current section and a flow expansion section, the hot air main pipe is connected to the external flow control zone flow expansion section, the hot air surrounding pipe is connected to the direct current section of the external flow control zone, and a baffle is provided between the direct current section and the flow expansion section of the external flow control zone. Through the specific design of the external flow control zone, the kinetic energy of the hot air can be weakened, thereby reducing the flow rate of the hot air entering the hot air surrounding pipe and improving the uniformity of the air volume distribution of each tuyere of the blast furnace. However, the patent does not take into account the impact on the blast furnace air supply system when the hot air flow provided by the hot blast furnace is unstable. Summary of the invention

[0006] The utility model provides a uniform air supply device for a blast furnace, which can solve the problem of uneven air volume distribution at each tuyere of the blast furnace when the hot air flow provided by the hot blast stove is unstable.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A uniform air supply device for a blast furnace, the device comprises a hot air main pipe, a hot air collecting chamber, a hot air downpipe, a hot air surrounding pipe and a hot air branch pipe; the hot air collecting chamber is a hollow spherical structure; one end of the hot air main pipe is connected to the hot air furnace of the blast furnace, and the other end is connected to the top of the spherical structure of the hot air collecting chamber; there are multiple hot air downpipes, and the hot air downpipes are uniformly distributed in the circumferential direction of the same horizontal outer circle of the spherical structure of the hot air collecting chamber; one end of the hot air downpipe is connected to the water level of the spherical structure of the hot air collecting chamber The hot blast pipe is connected at a flat outer circle, and the other end is connected to the hot blast surrounding pipe. Multiple hot blast downpipes divide the hot blast surrounding pipe into multiple areas. The hot blast downpipe consists of an upper inclined section, a vertical section, a downward inclined section and a horizontal section. The hot blast branch pipes are evenly arranged in multiple areas of the hot blast surrounding pipe, one end of the hot blast branch pipe is connected to the bottom of the hot blast surrounding pipe, and the other end is provided with an air outlet to send hot blast into the blast furnace. The connection between the hot blast branch pipe and the hot blast surrounding pipe is staggered in the horizontal direction from the connection between the hot blast downpipe and the hot blast surrounding pipe.

[0009] There are four hot air downcomers, which divide the hot air surrounding pipe into four areas; the number of the hot air branch pipes is 4n, where n=5, 6, 7, 8 or 9.

[0010] One end of the hot air downcomer is connected to the maximum horizontal outer circle of the spherical structure of the hot air collecting chamber, and the other end is connected to the hot air surrounding pipe.

[0011] The inner diameters of the hot air main pipe, the hot air downcomer pipe and the hot air surrounding pipe are the same.

[0012] The inner diameter of the spherical structure of the hot air collecting chamber is ≥ three times the inner diameter of the hot air main pipe.

[0013] The included angle between the upward inclined section and the vertical section of the hot air downcomer is 125° to 145°, and the included angle between the vertical section and the downward inclined section is 125° to 145°.

[0014] Expansion joints are arranged on the upper inclined section, the vertical section, the lower inclined section and the horizontal section of the hot air downcomer.

[0015] The pipe section connecting the hot air main pipe and the spherical structure of the hot air collecting chamber is arranged vertically.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1) The utility model provides a hot air collecting chamber to buffer the hot air from the hot blast stove, offset the unevenness of the hot air flow, ensure uniform air intake at each tuyere of the blast furnace, reduce the uneven distribution of the initial air flow of the blast furnace, and is beneficial to the reasonable distribution and forward stability of the blast furnace coal gas flow.

[0018] 2) The utility model installs expansion joints on each section of the hot air downcomer to reduce the influence of thermal shock. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0020] Figure 1 The utility model is a structural schematic diagram of a uniform air supply device for a blast furnace.

[0021] In the figure: 1. Hot air main pipe 2. Hot air collecting chamber 3. Hot air downcomer 4. Hot air surrounding pipe 5. Hot air branch pipe 31. Upper inclined section 32. Vertical section 33. Lower inclined section 34. Horizontal section DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0024] Example

[0025] like Figure 1 As shown, a uniform air supply device for a blast furnace includes a hot air main pipe 1, a hot air collecting chamber 2, a hot air downcomer 3, a hot air surrounding pipe 4 and a hot air branch pipe 5.

[0026] The hot air plenum 2 is a hollow spherical structure, one end of the hot air main pipe 1 is connected to the hot air furnace of the blast furnace, and the other end is connected to the top of the spherical structure of the hot air plenum 2. The pipe section connecting the hot air main pipe 1 and the spherical structure of the hot air plenum 2 is arranged vertically.

[0027] There are four hot air downpipes 3, and the hot air downpipes 3 are evenly distributed in the circumferential direction of the same horizontal outer circle of the spherical structure of the hot air collecting chamber 2. One end of the hot air downpipe 3 is connected to the maximum horizontal outer circle of the spherical structure of the hot air collecting chamber 2, and the other end is connected to the hot air surrounding pipe 4. The hot air downpipe 3 divides the hot air surrounding pipe 4 into four areas.

[0028] The hot air downcomer 3 is composed of an upper inclined section 31, a vertical section 32, a lower inclined section 33 and a horizontal section 34. The angle between the upper inclined section 31 and the vertical section 32 of the hot air downcomer is 135 degrees, and the angle between the vertical section 32 and the lower inclined section 33 is 135 degrees. And each section of the hot air downcomer 3 is equipped with an expansion joint.

[0029] The hot blast branch pipes 5 are evenly arranged in four areas of the hot blast surrounding pipe 4. One end of the hot blast branch pipe 5 is connected to the bottom of the hot blast surrounding pipe 4, and the other end is provided with an air outlet to send hot blast into the blast furnace.

[0030] The inner diameters of the hot air main pipe 1, the hot air downcomer 3 and the hot air surrounding pipe 4 are the same, all 2m. The inner diameter of the spherical structure of the hot air plenum 2 is 6m. The number of hot air branch pipes 5 is 4n, n=9, that is, the number of hot air branch pipes 5 is 36, and 9 hot air branch pipes 5 are evenly distributed in each area of ​​the hot air surrounding pipe 4. The connection between the hot air branch pipe 5 and the hot air surrounding pipe 4 is staggered in the horizontal direction from the connection between the hot air downcomer 3 and the hot air surrounding pipe 4.

[0031] The working process of this embodiment is:

[0032] The hot air from the hot blast stove passes through the hot blast main pipe 1 and enters the hot blast collecting chamber 2 for buffering. The buffered hot air passes through the hot blast downcomer 3, the hot blast enclosure 4 and the hot blast branch pipe 5 in turn, and finally the hot air is sent into the blast furnace.

[0033] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the idea of ​​the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A blast furnace uniform air supply device, It is characterized in that The device comprises a hot blast main pipe, a hot blast collecting chamber, a hot blast downpipe, a hot blast surrounding pipe and a hot blast branch pipe; the hot blast collecting chamber is a hollow spherical structure; one end of the hot blast main pipe is connected to the hot blast furnace of the blast furnace, and the other end is connected to the top of the spherical structure of the hot blast collecting chamber; there are multiple hot blast downpipes, and the hot blast downpipes are evenly distributed in the circumferential direction of the same horizontal outer circle of the spherical structure of the hot blast collecting chamber; one end of the hot blast downpipe is connected to the horizontal outer circle of the spherical structure of the hot blast collecting chamber, and the other end is connected to the hot blast surrounding pipe, and the multiple hot blast downpipes divide the hot blast surrounding pipe into multiple areas; the hot blast downpipe consists of an upper inclined section, a vertical section, a lower inclined section and a horizontal section; the hot blast branch pipes are evenly arranged in multiple areas of the hot blast surrounding pipe, one end of the hot blast branch pipe is connected to the bottom of the hot blast surrounding pipe, and the other end is provided with an air outlet to send the hot blast into the blast furnace; the connection between the hot blast branch pipe and the hot blast surrounding pipe is staggered in the horizontal direction from the connection between the hot blast downpipe and the hot blast surrounding pipe.

2. A blast furnace uniform air supply device according to claim 1, It is characterized in that There are four hot air downcomers, which divide the hot air surrounding pipe into four areas; the number of the hot air branch pipes is 4n, where n=5, 6, 7, 8 or 9.

3. A blast furnace uniform air supply device according to claim 1, It is characterized in that One end of the hot air downcomer is connected to the maximum horizontal outer circle of the spherical structure of the hot air collecting chamber, and the other end is connected to the hot air surrounding pipe.

4. A blast furnace uniform air supply device according to claim 1, It is characterized in that The inner diameters of the hot air main pipe, the hot air downcomer pipe and the hot air surrounding pipe are the same.

5. A blast furnace uniform air supply device according to claim 1, It is characterized in that The inner diameter of the spherical structure of the hot air collecting chamber is ≥ three times the inner diameter of the hot air main pipe.

6. A blast furnace uniform air supply device according to claim 1, It is characterized in that The included angle between the upward inclined section and the vertical section of the hot air downcomer is 125° to 145°, and the included angle between the vertical section and the downward inclined section is 125° to 145°.

7. A blast furnace uniform air supply device according to claim 1, It is characterized in that Expansion joints are arranged on the upper inclined section, the vertical section, the lower inclined section and the horizontal section of the hot air downcomer.

8. A blast furnace uniform air supply device according to claim 1, It is characterized in that The pipe section connecting the hot air main pipe and the spherical structure of the hot air collecting chamber is arranged vertically.

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