Blast furnace iron runner ventilation structure

Abstract

The utility model belongs to the technical field of blast furnace iron runner processes, and particularly relates to a blast furnace iron runner ventilation structure which is characterized by comprising an iron casting house main runner, a compressed air source, a dust removal cover, a blast furnace dust removal pipeline and a main runner cover plate, and the upper edge of the iron casting house main runner is completely sealed and covered by the dust removal cover and the main runner cover plate from a molten iron inlet end to a molten iron outlet end; wherein the dust hood is arranged at the molten iron inlet end of the casting house main channel; a ventilation pipe network is arranged in a ventilation channel between the bottom of the casting house main channel and the casting house foundation concrete channel, a compressed air source is connected to a ventilation pipe network air inlet in the molten iron outlet end of the casting house main channel through a pipeline, and an air outlet of the ventilation pipe network is located in the molten iron inlet end of the casting house main channel and connected with a blast furnace dust removal pipeline through a pipeline. The device has the beneficial effects that the workload of equipment transformation is small, the temperature of the iron runner during blast furnace tapping is effectively reduced, the service life of the main iron runner is correspondingly prolonged, and conditions are created for improving the production level of the blast furnace.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace iron ditch technology, in particular to a blast furnace iron ditch venting structure. Background Art

[0002] With the development of steel smelting technology, blast furnaces, as key equipment in the long-process steelmaking process, are gradually developing towards large-scale and long-life. Among them, the taphole, as an important furnace front facility of the blast furnace, has received more and more attention. The main function of the taphole is to separate the slag and iron mixture flowing out of the blast furnace taphole, and then send the slag and molten iron to the ladle and slag treatment facilities for treatment.

[0003] The high-temperature molten iron and slag that gushed out from the blast furnace taphole first enter the main ditch of the tapping site, causing the main ditch refractory materials to be in a high-temperature working environment. Production practice shows that the main reason for the damage of the permanent layer of the main ditch is the long-term chemical erosion and scouring of the working layer by high-temperature slag iron, and the thermal stress caused by the thermal expansion and contraction, rapid cooling and heating of the refractory materials and steel troughs, which causes cracks in the refractory materials. Therefore, to extend the life of the main ditch, it is necessary to prevent the refractory materials from being chemically eroded by slag iron and mechanically damaged by thermal stress and thermal shock. In order to increase the service life of the main ditch and reduce the replacement frequency of the main ditch refractory materials, the main ditch generally adopts cooling treatment. The existing cooling methods mostly adopt natural cooling or water cooling, among which water cooling uses cooling water as a coolant. These two methods have low effects and efficiency, and are prone to cause greater damage to the tapping ditch, greatly shortening the service life of the tapping ditch, which is not conducive to the normal and orderly production of the blast furnace. For example, the natural air cooling method, since the iron outlet ditch is an open structure, the high-temperature harmful gases and dust generated during operation will scatter, which will have a significant adverse impact on the surrounding production environment and the health of the workers; while the cooling water cooling, when the refractory material in the steel shell is damaged, it is easy for water to come into contact with molten iron and explode, causing an accident, and after long-term operation, the inner wall of the water pipe will rust and cause blockage, thus affecting the cooling effect.

[0004] To ensure the safety of iron tapping, we chose air cooling. Patents CN201821570235.4 and CN216039655 U both proposed a method of air cooling the iron trough, but these methods did not explain the source and recovery of the cooling gas, but simply proposed natural air cooling. In order to protect the cooling effect, solving the cooling effect of forced air cooling and the treatment of dusty air after cooling has become an urgent problem to be solved. Utility Model Content

[0005] The utility model aims to provide a blast furnace trough ventilation structure, overcomes the shortcomings of the prior art, realizes efficient ventilation in the iron trough cooling process, enables the cooling space outside the iron trough steel shell to be quickly and evenly cooled, utilizes the existing compressed air as the cooling medium to cool the blast furnace trough, has a small workload for equipment transformation, and uniformly discharges the dust-containing air after cooling into the suction duct of the dust removal system of the blast furnace iron-making yard, thereby solving the problem of environmental pollution.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A blast furnace ditch ventilation structure, characterized in that it includes a main ditch of an iron-making yard, a dust removal hood, a blast furnace dust removal pipeline and a main ditch cover plate, wherein the upper edge of the main ditch of the iron-making yard is completely covered by the dust removal hood and the main ditch cover plate from the molten iron inlet end to the molten iron outlet end, wherein the dust removal hood is arranged at the molten iron inlet end of the main ditch of the iron-making yard; a ventilation pipe network is arranged in the ventilation channel between the bottom of the main ditch of the iron-making yard and the concrete ditch of the iron-making yard foundation, a compressed air source is connected to the air inlet of the ventilation pipe network at the molten iron outlet end of the main ditch of the iron-making yard through a pipeline, and the air outlet of the ventilation pipe network is located at the molten iron inlet end of the main ditch of the iron-making yard, and is connected to the blast furnace dust removal pipeline through a pipeline.

[0008] The ventilation pipe network includes a left pipe and a right pipe, and multiple transverse pipes are connected to the left pipe and the right pipe respectively. The spacing between adjacent transverse pipes is 100-1000mm. The left pipe, the right pipe and the transverse pipe are all provided with air outlet holes distributed in a matrix.

[0009] The main trench of the iron-making yard is located in the steel trough, the bottom of the steel trough is arranged on the supporting steel, the supporting steel is arranged at the bottom of the concrete trench of the iron-making yard foundation, the inner side of the concrete trench of the iron-making yard foundation is lined with a permanent layer, and a ventilation channel with a width of 200-350mm is formed between the steel trough and the permanent layer.

[0010] A working layer is provided inside the main ditch of the iron-casting yard, large side wall products are provided on the left and right sides of the working layer, a side wall castable masonry layer is provided between the outer side of the large side wall products and the steel trough, large bottom corner products are provided on both sides of the bottom of the working layer, and a bottom casting layer is provided between the two large bottom corner products.

[0011] The cross-sections of the left tube and the right tube are rectangular or circular, and the cross-section length:width of the rectangular pipe is (1-8):1.

[0012] The cross section of the transverse pipe is rectangular or circular, and the cross section length:width of the rectangular pipe is (1-5):1.

[0013] The cross-sections of the left tube and the right tube are rectangular, and the preferred cross-section length:width of the rectangular tube is 5:1; the cross-section of the horizontal tube is rectangular, and the preferred cross-section length:width of the rectangular tube is 3:1.

[0014] Blocking plates are alternately arranged inside the left tube and the right tube, so that a tortuous flow channel is formed among the left tube, the horizontal tube and the right tube.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1) Compressed air is used as a cooling medium in the ventilation channel between the main iron ditch steel trough of the blast furnace and the reinforced concrete. Compressed air is used instead of water as the cooling medium for the iron ditch, which improves the safety factor and allows the cooling space outside the steel shell of the iron ditch to be quickly and evenly cooled. The existing compressed air is used as a cooling medium to cool the blast furnace iron ditch, which reduces the workload of equipment transformation and effectively reduces the temperature of the iron ditch when the blast furnace is tapping iron. The service life of the main iron ditch is correspondingly extended, the number of iron ditch repairs is reduced, and the work intensity on site is correspondingly reduced, creating conditions for improving the production level of the blast furnace;

[0017] 2) The transformation design is convenient and fast, and realizes efficient ventilation during the cooling process of the iron channel. After cooling, the air is uniformly discharged into the suction duct of the dust removal system of the blast furnace iron-making yard. In addition, the negative pressure of the existing ventilation duct is used to achieve forced exhaust, so that the air flows in an orderly manner in the cooling cavity. While ensuring the cooling of the iron channel, it also solves the pollution problem of dusty air. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model of a blast furnace duct ventilation structure;

[0019] Figure 2 for Figure 1 Sectional view along line AA;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the main trench of the iron-making yard in the embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of a tortuous flow channel in an embodiment of the utility model.

[0022] In the figure: 1- main trench of the iron-casting yard, 2- dust removal hood, 3- blast furnace dust removal pipeline, 4- main trench cover, 5- concrete trench of the iron-casting yard foundation, 6- ventilation channel, 7- ventilation pipe network, 8- compressed air source, 9- air inlet, 10- air outlet, 11- left side pipe, 12- right side pipe, 13- horizontal pipe, 14- steel trough, 15- supporting steel, 16- permanent layer, 17- working layer, 18- side wall block products, 19- bottom corner block products, 20- side wall castable masonry layer, 21- bottom casting layer, 22- blocking plate. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] See Figure 1-3 , is a schematic structural diagram of an embodiment of a blast furnace trough ventilation structure of the utility model, comprising a main ditch 1 of an iron-making field, a dust removal hood 2, a blast furnace dust removal pipeline 3 and a main ditch cover plate 4, the upper edge of the main ditch 1 of the iron-making field is completely covered by the dust removal hood 2 and the main ditch cover plate 4 from the molten iron inlet end to the molten iron outlet end, wherein the dust removal hood 2 is arranged at the molten iron inlet end of the main ditch 1 of the iron-making field, and the dust-containing flue gas is collected by the dust removal hood; a ventilation pipe network 7 is arranged in the ventilation channel 6 between the bottom of the main ditch 1 of the iron-making field and the concrete ditch 5 of the iron-making field foundation, and a compressed air source 8 is taken from the compressed air on site of the blast furnace, and the compressed air source 8 is connected to the air inlet 9 of the ventilation pipe network 7 at the molten iron outlet end of the main ditch 1 of the iron-making field through a pipeline, and the air outlet 10 of the ventilation pipe network 7 is located at the molten iron inlet end of the main ditch 1 of the iron-making field, and is connected to the blast furnace dust removal pipeline 3 through a pipeline.

[0027] The ventilation pipe network 7 includes a left pipe 11 and a right pipe 12. A plurality of transverse pipes 13 are connected to the left pipe 11 and the right pipe 12 respectively. The spacing between adjacent transverse pipes 13 is 100-1000 mm. The left pipe 11, the right pipe 12 and the transverse pipe 13 are all provided with air outlet holes distributed in a matrix for cooling the main iron trough and steel trough of the blast furnace.

[0028] The main trench 1 of the iron-making yard is located in the steel trough 14, the bottom of the steel trough 14 is set on the supporting steel 15, the supporting steel 15 is set in the concrete trench 5 of the iron-making yard foundation, and the inner side of the concrete trench 5 of the iron-making yard foundation is lined with a permanent layer 16. A ventilation channel 6 with a width of 200-350mm is formed between the steel trough 14 and the permanent layer 16.

[0029] A working layer 17 is provided inside the main ditch 1 of the iron-making yard, side wall block products 18 are provided on the left and right sides of the working layer 17, a side wall castable masonry layer 20 is provided between the outer side of the side wall block product 18 and the steel trough 14, bottom corner block products 19 are provided on both sides of the bottom of the working layer 17, and a bottom casting layer 21 is provided between the two bottom corner block products 19.

[0030] The cross-section of the left tube 11 and the right tube 12 is rectangular or circular, and the cross-section length of the rectangular tube is (1-8): 1. The cross-section of the transverse tube 13 is rectangular or circular, and the cross-section length of the rectangular tube is (1-5): 1. The cross-section of the left tube 11 and the right tube 12 is rectangular, and the cross-section length of the rectangular tube is preferably 5:1; the cross-section of the transverse tube 13 is rectangular, and the cross-section length of the rectangular tube is preferably 3:1.

[0031] See Figure 4 In order to reduce the short-circuit effect of compressed air and further improve the cooling effect, blocking plates 22 can be alternately provided in the left tube 11 and the right tube 12 to form a tortuous flow channel between the left tube 11, the cross tube 13, and the right tube 12.

[0032] The utility model discloses a method for transforming the ventilation structure of a blast furnace trough. First, step one: a ventilation pipe network 7 is arranged in a ventilation channel 6 between the bottom of a main ditch 1 of an iron-making field and a concrete ditch 5 of a foundation of the iron-making field, a compressed air source 8 at the blast furnace site is connected to an air inlet 9 of the ventilation pipe network 7 at a molten iron outlet end of the main ditch 1 of the iron-making field through a pipeline, an air outlet 10 of the ventilation pipe network 7 is located at a molten iron outlet end of the main ditch 1 of the iron-making field, and is connected to a blast furnace dust removal pipeline 3 through a pipeline, so as to complete the production of a cooling ventilation flow channel; then step two: the upper edge of the main ditch 1 of the iron-making field is completely covered from a molten iron outlet end to a molten iron outlet end by a dust removal hood 2 and a main ditch cover plate 4, wherein the dust removal hood 2 is arranged at a molten iron outlet end of the main ditch 1 of the iron-making field, so as to complete the covering of dust-containing air and solve the pollution problem of dust-containing air.

[0033] The main trench cover 4 is made of multiple pieces, which is convenient for partial opening to inspect and maintain the inside of the main trench. A rock wool sealing pad is provided at the bottom of the main trench cover 4, which has flame retardant and sealing effects. In order to achieve an ideal ventilation and cooling effect, the wind pressure in the ventilation pipe network 7 is 1500 to 3000 Pa.

[0034] 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 duct venting structure, characterized in that: It includes a main ditch of the iron-making yard, a dust removal hood, a blast furnace dust removal pipeline and a main ditch cover. The upper edge of the main ditch of the iron-making yard is completely covered by the dust removal hood and the main ditch cover from the molten iron inlet end to the molten iron outlet end, wherein the dust removal hood is arranged at the molten iron inlet end of the main ditch of the iron-making yard; a ventilation pipe network is arranged in the ventilation channel between the bottom of the main ditch of the iron-making yard and the concrete ditch of the iron-making yard foundation, a compressed air source is connected to the air inlet of the ventilation pipe network at the molten iron outlet end of the main ditch of the iron-making yard through a pipeline, and the air outlet of the ventilation pipe network is located at the molten iron inlet end of the main ditch of the iron-making yard, and is connected to the blast furnace dust removal pipeline through a pipeline.

2. A blast furnace duct venting structure according to claim 1, characterized in that: The ventilation pipe network includes a left pipe and a right pipe, and multiple transverse pipes are connected to the left pipe and the right pipe respectively. The spacing between adjacent transverse pipes is 100-1000mm. The left pipe, the right pipe and the transverse pipe are all provided with air outlet holes distributed in a matrix.

3. A blast furnace duct venting structure according to claim 1, characterized in that: The main trench of the iron-making yard is located in the steel trough, the bottom of the steel trough is arranged on the supporting steel, the supporting steel is arranged at the bottom of the concrete trench of the iron-making yard foundation, the inner side of the concrete trench of the iron-making yard foundation is lined with a permanent layer, and a ventilation channel with a width of 200-350mm is formed between the steel trough and the permanent layer.

4. A blast furnace duct venting structure according to claim 1, characterized in that: A working layer is provided inside the main ditch of the iron-casting yard, large side wall products are provided on the left and right sides of the working layer, a side wall castable masonry layer is provided between the outer side of the large side wall products and the steel trough, large bottom corner products are provided on both sides of the bottom of the working layer, and a bottom casting layer is provided between the two large bottom corner products.

5. A blast furnace duct venting structure according to claim 2, characterized in that: The cross-sections of the left tube and the right tube are rectangular or circular, and the cross-section length:width of the rectangular pipe is 1-8:

1.

6. A blast furnace duct venting structure according to claim 2, characterized in that: The cross section of the transverse pipe is rectangular or circular, and the cross section length:width of the rectangular pipe is 1-5:

1.

7. A blast furnace duct venting structure according to claim 2, characterized in that: The cross-sections of the left tube and the right tube are rectangular, and the length:width of the cross-section of the rectangular tube is 5:1; the cross-section of the horizontal tube is rectangular, and the length:width of the cross-section of the rectangular tube is 3:

1.

8. A blast furnace duct venting structure according to claim 2, characterized in that: Blocking plates are alternately arranged inside the left tube and the right tube, so that a tortuous flow channel is formed among the left tube, the horizontal tube and the right tube.

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