Tuyere blowing device and blast furnace

Abstract

The tuyere blowing device comprises a main medium channel, and the outlet end of the main medium channel is sequentially provided with a gradually-shrinking area, a necking area and a gradually-expanding area which are communicated with one another in the blowing direction of airflow; the outlet end of the first auxiliary medium channel is communicated to the divergent area, and the first auxiliary medium channel is provided with a Laval pipe section; and the outlet end of the second auxiliary medium channel is communicated to the gradual shrinking area. The outlet end of the main medium channel is of a Laval pipe structure, and a main medium flowing in the main medium channel can be accelerated to a high speed after flowing through the outlet end. The outlet end of the first auxiliary medium channel is communicated to the divergent area, the first auxiliary medium channel is provided with a Laval pipe section, the first auxiliary medium can be accelerated to the speed close to the speed of the main medium, the small speed difference is achieved, and the damage effect caused by local convolution area eddy currents generated due to the large speed difference is avoided; and the service life of the tuyere blowing device is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnaces, and more particularly to a tuyere blowing device and a blast furnace. Background Art

[0002] Conventional blast furnace, pure oxygen blast furnace ironmaking, hydrogen-rich carbon circulating oxygen blast furnace, Ouye furnace, and other smelting reduction ironmaking, the hot air, coal powder, pure oxygen, coal gas and other energy media required for ironmaking are all sprayed into the ironmaking furnace independently or in combination through the injection device.

[0003] The tuyere blowing device is mainly used to provide hot air required for combustion in the blast furnace during blast furnace smelting. According to different blast furnace smelting operation processes, the blast furnace tuyere blowing device can increase the injection of coal powder or gas fuel while blowing hot air. Conventional blast furnace tuyere blowing devices use hot air (oxygen + nitrogen + water) as the main medium. The tuyere blowing device mainly depends on the diameter of the tuyere outlet. Reasonable design of the tuyere outlet diameter can ensure that the hot air has a reasonable blast kinetic energy and a certain depth of hot air into the furnace to meet the requirements of blast furnace smelting. In order to reduce the amount of coke used in blast furnace smelting, conventional blast furnaces will spray coal powder or natural gas and other fuels from the blast furnace tuyere.

[0004] Existing conventional blast furnace tuyere blowing device is as follows Figure 1 As shown, it includes a main medium channel 1, a pulverized coal channel 2 and a fuel gas channel 3. Hot air is sprayed into the furnace through the main medium channel 1. The pulverized coal channel 2 and the fuel gas channel 3 can be used to spray pulverized coal and fuel gas into the furnace respectively, or both can spray pure oxygen. The hot air sprayed into the main medium channel 1 provides oxygen for the combustion of coke and pulverized coal in the furnace, and produces reducing gases such as carbon monoxide and hydrogen in the vortex zone of the tuyere. The sprayed hot air also brings a large amount of heat into the furnace to meet the heat required for the reduction of iron oxide in the furnace. In order to save the consumption of coke in the furnace, pulverized coal and fuel gas or pure oxygen can be sprayed from the pulverized coal channel 2 and the fuel gas channel 3 to produce fuel and produce carbon monoxide reducing gas for the combustion of coke in the furnace.

[0005] The hot air of the existing blast furnace tuyere blowing device is the main medium. The flow rate of the hot air at the outlet of the main medium channel 1 is the main control parameter of the system, which determines the size of the tuyere vortex zone, as well as the concentration field, velocity field, chemical reaction of the pulverized coal and oxygen entering the main medium channel 1 from the pulverized coal channel 2 and the gas channel 3, and the service life of the tuyere blowing device. The flow rate of the hot air in the main medium channel 1 is generally 200~250m / s, and the flow rate of the pulverized coal and gas is generally 15~25m / s. The pulverized coal, gas and other media are mixed at a certain point in the tuyere blowing device, and there is no uniform distribution and mixing function. In the mixing area, due to the large speed difference and speed angle between the pulverized coal, gas and hot air, a vortex zone with high-temperature combustion and uneven concentration distribution is formed around the mixing area, resulting in high local tuyere temperature. This phenomenon is one of the main reasons for the burning of the tuyere blowing device.

[0006] Therefore, how to reduce the destructive effect of eddy currents in the local whirlpool zone is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0007] In view of this, the object of the present invention is to provide a tuyere blowing device to reduce the destructive effect of eddy currents in the local whirlpool zone; Another object of the present invention is to provide a blast furnace having the above-mentioned tuyere blowing device.

[0008] To achieve the above object, the present invention provides the following technical solutions: A tuyere blowing device, comprising: A main medium channel, wherein the outlet end of the main medium channel is a gradually contracting area, a shrinking area and a gradually expanding area connected in sequence along the blowing direction of the airflow; a first auxiliary medium channel, wherein an outlet end of the first auxiliary medium channel is connected to the gradually expanding area, and the first auxiliary medium channel has a Laval pipe section; A second auxiliary medium channel, wherein an outlet end of the second auxiliary medium channel is connected to the tapered area.

[0009] Optionally, in the above-mentioned tuyere blowing device, there are multiple first auxiliary medium channels, and the outlet ends of the respective first auxiliary medium channels are evenly arranged along the circumference of the gradually expanding zone.

[0010] Optionally, in the above-mentioned tuyere blowing device, the outlet end of the second auxiliary medium channel is connected to the connection between the tapered area and the necking area.

[0011] Optionally, in the above-mentioned tuyere blowing device, the main medium channel includes: A main medium channel body, one end of which is a main medium inlet; The Laval nozzle tuyere sleeve, the tapering area, the shrinking area and the gradually expanding area are arranged on the Laval nozzle tuyere sleeve, and the outlet of the main medium channel body is sealed and connected to the tapering area.

[0012] Optionally, in the above-mentioned tuyere blowing device, the gradually contracting zone, the shrinking zone and the gradually expanding zone are coaxially arranged, and the axis is a first axis, and the axis of the main medium channel body is a second axis; The included angle a between the first axis and the second axis is 5°~30°.

[0013] Optionally, in the above-mentioned tuyere blowing device, the axis of the outlet end of the first auxiliary medium channel is a third axis, and an angle b between the third axis and the second axis is 5° to 45°.

[0014] Optionally, in the above-mentioned tuyere blowing device, the main medium blowing speed at the outlet end of the main medium channel is VZ2, the first auxiliary medium blowing speed at the outlet end of the first auxiliary medium channel is VOZ2, the first auxiliary medium blowing speed VOZ2 has a first direction component speed in a direction parallel to the first axis as VO2, and a second direction component speed in a direction perpendicular to the first axis as VO1; The speed deviation between the first direction component velocity VO2 and the main medium blowing velocity VZ2 is within the range of -10% to +10%.

[0015] Optionally, in the above-mentioned tuyere blowing device, the second direction component velocity VO1 is within 15% of the first auxiliary medium blowing velocity VOZ2.

[0016] Optionally, in the above-mentioned tuyere blowing device, there are multiple first auxiliary medium channels, and the first auxiliary medium blown by each of the first auxiliary medium channels includes a first type of medium and / or a second type of medium, the first type of medium is oxygen, and the second type of medium includes one of hydrogen, natural gas, coke oven gas and converter gas, and the first auxiliary medium blown by each of the first auxiliary medium channels is the same, or, the first auxiliary medium blown by a part of each of the first auxiliary medium channels is the first type of medium, and the first auxiliary medium blown by another part of each of the first auxiliary medium channels is the second type of medium; and / or, The main medium sprayed in the main medium channel is hot air, coal gas, mixed coal gas synthesis gas, ammonia and carbon dioxide synthesis gas or ammonia and hydrogen synthesis gas; and / or, The second auxiliary medium sprayed through the second auxiliary medium channel is a gas of the same nature as the main medium or a mixed fluid of a gas of the same nature as the main medium and a solid powder, wherein the solid powder includes at least one of calcium oxide powder, magnesium oxide powder, iron oxide powder, ferrous oxide powder, lime powder and dolomite powder; and / or, The second auxiliary medium blowing speed at the outlet end of the second auxiliary medium channel is within 20% of the main medium blowing speed at the outlet end of the main medium channel.

[0017] The tuyere blowing device provided by the present invention adopts a reducer structure at the outlet end of the main medium channel, including a gradually contracting area, a shrinking area and a gradually expanding area, that is, the outlet end of the main medium channel is a Laval tube structure, and the main medium flowing in the main medium channel can be accelerated to a corresponding speed after passing through the gradually contracting area, the shrinking area and the gradually expanding area. The outlet end of the first auxiliary medium channel is connected to the gradually expanding area, and the first auxiliary medium channel has a Laval tube section. When the first auxiliary medium flowing in the first auxiliary medium channel flows through the Laval tube section, it is accelerated to a speed close to that of the main medium, so that when the first auxiliary medium and the main medium are mixed in the gradually expanding area, there is a smaller speed difference, thereby avoiding the generation of a vortex zone in the tuyere blowing device due to a large speed difference, that is, reducing the destructive effect of the vortex generated in the local vortex zone, and extending the service life of the tuyere blowing device. The outlet end of the second auxiliary medium channel is connected to the tapered zone, that is, the second auxiliary medium channel is connected to a position in the main medium channel where the flow rate of the main medium is slower, so that the second auxiliary medium flowing in the second auxiliary medium channel can include solid powder, so that the solid powder is mixed with the main medium with a lower speed to avoid the vortex problem in the whirlpool zone caused by the large speed difference.

[0018] In addition, in a specific embodiment of the present invention, the contraction zone, the constriction zone and the gradual expansion zone are arranged on the tuyere sleeve, so that the tuyere sleeve is a tuyere sleeve with a Laval nozzle structure to accelerate the medium from there to the target speed.

[0019] A blast furnace comprises the tuyere blowing device as described in any one of the above items.

[0020] The blast furnace provided by the present invention has all the technical effects of the above-mentioned tuyere blowing device because it has the above-mentioned tuyere blowing device, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the first tuyere blowing device in the prior art; Figure 2 It is a structural schematic diagram of the second tuyere blowing device in the prior art; Figure 3It is a structural schematic diagram of the third type of tuyere blowing device in the prior art; Figure 4 It is a structural schematic diagram of the fourth tuyere blowing device in the prior art; Figure 5 It is a structural schematic diagram of the tuyere blowing device disclosed in an embodiment of the present invention; Figure 6 It is a side view of each medium outlet of the tuyere blowing device disclosed in the embodiment of the present invention; Figure 7 It is a schematic structural diagram of a Laval nozzle tuyere sleeve disclosed in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of the main medium channel disclosed in an embodiment of the present invention; Fig. 9 A schematic diagram of the angle between the first auxiliary medium channel and the axis of the gradually expanding zone disclosed in an embodiment of the present invention; Fig.10 It is an exploded diagram of the flow rate of the first auxiliary medium disclosed in an embodiment of the present invention; Fig.11 This is a positional relationship diagram between the second auxiliary medium channel and the main medium channel disclosed in an embodiment of the present invention.

[0023] The meanings of the reference numerals in the figures are as follows: 1-main medium channel; 2-coal powder channel; 3-fuel gas channel; 4-main medium channel; 5-coal powder channel; 6-oxygen channel; 7-main medium channel; 8-natural gas channel; 9-oxygen channel; 10-main medium channel; 11-oxygen channel; 12-coal powder channel; 100-main medium channel body; 101-gradual expansion zone; 102-narrowing zone; 103-gradual contraction zone; 104-transition zone; 105-contraction tube; 200-Laval nozzle tuyere small sleeve; 300- tuyere middle set; 400-large air outlet set; 500 - second auxiliary medium channel; 600-first auxiliary medium channel; 610-Laval pipe section; 611-gradually expanding section; 612-narrowing section; 613-gradually contracting section. DETAILED DESCRIPTION

[0024] The core of the present invention is to provide a tuyere blowing device to reduce the destructive effect of eddy currents in the local whirlpool area; Another core of the present invention is to provide a blast furnace having the above-mentioned tuyere blowing device.

[0025] The following embodiments are described with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention contents described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to those necessary as solutions to the inventions described in the claims. It should be noted that, for ease of description, only the parts related to the inventions are shown in the accompanying drawings. The embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0026] Whether it is a tuyere blowing device used in a blast furnace or a tuyere blowing device used in a non-blast furnace-molten reduction Ouye furnace, a combination structure of multiple energy media injection is required according to process requirements.

[0027] For example, Figure 2 The conventional blast furnace oxygen and pulverized coal injection scheme is shown. The device mainly uses the hot air in the main medium channel 4 to form a tuyere whirlpool area, and the pulverized coal in the pulverized coal channel 5 and the oxygen in the oxygen channel 6 are directly mixed into the center of the main medium channel 4.

[0028] Figure 3 The scheme shown is for injecting natural gas and oxygen into a conventional blast furnace. The device mainly uses hot air in the main medium channel 7 to form a tuyere vortex zone. The natural gas in the natural gas channel 8 and the oxygen in the oxygen channel 9 are directly mixed into the edge and center of the main medium channel 7 respectively.

[0029] Figure 4 Another conventional blast furnace coal powder and oxygen injection scheme is shown. The device mainly uses the hot air in the main medium channel 10 to form a tuyere vortex zone. The coal powder in the coal powder channel 12 is directly mixed into the center of the main medium channel 10, and the highly oxygen-enriched oxygen in the oxygen channel 11 is directly injected into the furnace.

[0030] From the above scheme, it can be seen that the tuyere blowing device for blast furnace in the prior art mainly uses hot air as the main material, supplemented by coal powder, oxygen, natural gas and other media. The tuyere hot air controls the gas velocity to be 200~250m / s, and the velocities of other media such as oxygen, coal powder, natural gas, etc. are controlled to be 20~50m / s. Moreover, the oxygen, coal powder, natural gas and other media are mixed in a concentrated point in the tuyere blowing device (such as Figure 2 The scheme shown in the figure has no uniform distribution and mixing function. In the tuyere area, due to the large speed difference between pulverized coal, oxygen, natural gas and hot air, a high-temperature combustion and uneven concentration distribution vortex zone is formed in the tuyere. These vortex zones have a certain destructive effect on the tuyere blowing device and have an adverse effect on the smelting process.

[0031] Based on this, the embodiment of the present invention discloses a tuyere blowing device, which can achieve uniformity of various media, such as uniformity of velocity field and medium concentration field, eliminate the destructive effect of eddy current in the local whirlpool area on the tuyere, and improve production smelting efficiency.

[0032] like Figure 5-Figure 7 As shown, the tuyere blowing device disclosed in the embodiment of the present invention includes a main medium channel, a first auxiliary medium channel 600 and a second auxiliary medium channel 500 .

[0033] like Figure 8 As shown, the outlet end of the main medium channel is connected to the converging zone 103, the constricting zone 102 and the expanding zone 101 in sequence along the blowing direction of the airflow. Along the blowing direction, the aperture of the converging zone 103 gradually decreases, the aperture of the constricting zone 102 remains unchanged and is the same as the minimum aperture of the converging zone 103, and the aperture of the expanding zone 101 gradually increases. That is, the outlet end of the main medium channel adopts a reducer structure, so that the flow rate of the main medium is different at different positions in the reducer area, so other auxiliary media can be mixed in the corresponding area according to needs to reduce the risk of forming vortex in the whirlpool area.

[0034] like Fig. 9 As shown, the outlet end of the first auxiliary medium channel 600 is connected to the gradually expanding zone 101, and the first auxiliary medium channel 600 has a Laval tube section 610, which can accelerate the first auxiliary medium flowing in the first auxiliary medium channel 600, so that the first auxiliary medium can be sprayed into the gradually expanding zone 101 at a faster speed and mixed with the main medium in the gradually expanding zone 101.

[0035] like Fig.11 As shown, the outlet end of the second auxiliary medium channel 500 is connected to the tapered area 103, and the second auxiliary medium channel 500 can be used to transport media that require a low flow rate, such as solid powder. Because the solid powder is a granular body, it cannot be mixed into the main medium at a faster speed, otherwise the solid powder will have a greater destructive effect on the channel wall of the main medium channel, causing more serious wear of the channel wall. In this embodiment, the tapered area 103, the shrinking area 102 and the gradually expanding area 101 are designed at the outlet end of the main medium channel to connect the outlet end of the second auxiliary medium channel 500 to the tapered area 103 with a slower flow rate.

[0036] In this embodiment, multiple first auxiliary medium channels 600 may be provided, or only one may be provided according to demand. When multiple first auxiliary medium channels 600 are provided, the outlet ends of the respective first auxiliary medium channels 600 are evenly arranged along the circumference of the gradually expanding zone 101, and the angles between the outlet ends of the respective first auxiliary medium channels 600 and the axis of the gradually expanding zone 101 should be equal.

[0037] When a plurality of first auxiliary medium channels 600 are arranged, the first auxiliary medium sprayed by each first auxiliary medium channel 600 may include the first type of medium and / or the second type of medium. That is, each first auxiliary medium channel 600 may spray the first type of medium or the second type of medium, that is, the first auxiliary medium sprayed by each first auxiliary medium channel 600 is the same. Alternatively, a portion of the first auxiliary medium channels 600 may spray the first type of medium, and another portion of the first auxiliary medium channels 600 may spray the second type of medium.

[0038] The first type of medium may be oxygen, and the second type of medium may be one of hydrogen, natural gas, coke oven gas and converter gas. That is, since the first auxiliary medium of the first auxiliary medium channel 600 and the main medium of the main medium channel are mixed at the position where the main medium has the fastest flow rate, the first auxiliary medium should be gas (i.e., try not to contain particulate matter), so the first auxiliary medium may be the combustion-supporting gas or combustible gas listed above.

[0039] The main medium injected into the main medium channel can be hot air, coal gas, mixed coal gas synthesis gas, ammonia and carbon dioxide synthesis gas, or ammonia and hydrogen synthesis gas. The type of main medium is related to the furnace type. The main medium injected into conventional blast furnaces is hot air, and the main medium injected into unconventional blast furnaces is high-reducing high-temperature coal gas, mixed coal gas synthesis gas, ammonia and carbon dioxide synthesis gas, ammonia and hydrogen synthesis gas, etc. The specific main medium can be selected according to the furnace type.

[0040] The second auxiliary medium sprayed by the second auxiliary medium channel 500 can be a gas of the same nature as the main medium (for example, if the main medium is coal gas, the gas of the same nature as the main medium can be coal gas or a gas mixed with coal powder; if the main medium is hot air, the gas of the same nature as the main medium can be oxygen or nitrogen) or a mixed fluid of a gas of the same nature as the main medium and a solid powder, and the solid powder can be at least one of calcium oxide powder, magnesium oxide powder, iron oxide powder, ferrous oxide powder, lime powder and dolomite powder.

[0041] The tuyere blowing device provided by the present invention adopts a reducer structure at the outlet end of the main medium channel, including a tapered area 103, a constricted area 102 and a gradually expanding area 101, that is, the outlet end of the main medium channel is a Laval tube structure, and the main medium flowing in the main medium channel can be accelerated to a higher speed after flowing through the tapered area 103, the constricted area 102 and the gradually expanding area 101. The outlet end of the first auxiliary medium channel 600 is connected to the gradually expanding area 101, and the first auxiliary medium channel 600 has a Laval tube section 610. When the first auxiliary medium flowing in the first auxiliary medium channel 600 flows through the Laval tube section 610, it is accelerated to a speed close to that of the main medium, so that when the first auxiliary medium and the main medium are mixed in the gradually expanding area 101, there is a small speed difference, thereby avoiding the generation of a whirlpool zone in the tuyere blowing device due to a large speed difference, that is, reducing the destructive effect of the vortex generated in the local whirlpool zone, and extending the service life of the tuyere blowing device. The outlet end of the second auxiliary medium channel 500 is connected to the tapered zone 103, that is, the second auxiliary medium channel 500 is connected to a position of the main medium channel where the flow rate of the main medium is slower, so that the second auxiliary medium flowing in the second auxiliary medium channel 500 can include solid powder, so that the solid powder is mixed with the main medium with a lower speed to avoid the vortex problem in the whirlpool zone caused by the large speed difference.

[0042] like Fig.11 As shown, in a specific embodiment of the present invention, the outlet end of the second auxiliary medium channel 500 is connected to the connection between the tapered zone 103 and the constricted zone 102, that is, the outlet end of the second auxiliary medium channel 500 is connected to the end of the tapered zone 103. Since the second auxiliary medium sprayed by the second auxiliary medium channel 500 usually contains particulate matter, and the particulate matter contacts the channel wall of the main medium channel, the channel wall will be worn, resulting in damage to the tuyere spraying device. In this embodiment, the outlet end of the second auxiliary medium channel 500 is connected to the end of the tapered zone 103, that is, the beginning of the constricted zone 102. Since the constricted zone 102 is a section of equal diameter, the contact opportunity between the particulate matter and the channel wall can be reduced, thereby reducing the probability of wear.

[0043] It should be noted that when installing the second auxiliary medium channel 500, on the premise of meeting the installation requirements, the angle c between it and the axis of the necking area 102 should be kept as small as possible. The smaller the angle c between the two, the smaller the possibility of collision between particles and the channel wall of the main medium channel, and the easier it is to reduce the probability of particles wearing the channel wall.

[0044] like Figure 5 and Figure 8As shown, in this embodiment, the main medium channel includes a main medium channel body 100 and a Laval nozzle tuyere small sleeve 200. Specifically, the Laval nozzle tuyere small sleeve 200 can be fixed to the tuyere middle sleeve 300, the tuyere middle sleeve 300 is fixed to the tuyere large sleeve 400, and the tuyere large sleeve 400 is fixed to the furnace body, so that the end of the Laval nozzle tuyere small sleeve 200 extends into the furnace body to spray the corresponding medium into the furnace body.

[0045] One end of the main medium channel body 100 is the main medium inlet, which is used to connect the main medium supply equipment. The main medium channel body 100 is composed of a contraction tube 105 and a transition zone 104 in the direction from the main medium inlet to the Laval nozzle tuyere sleeve 200. The contraction tube 105 has a gradually narrowing aperture in the direction from the main medium inlet to the transition zone 104. The transition zone 104 is a constant diameter zone, one end of which is connected to the small diameter end of the contraction tube 105, and the other end is connected to the large diameter end of the tapered zone 103; specifically, the diameter of the large diameter end of the tapered zone 103, the diameter of the small diameter end of the contraction tube 105, and the diameter of the transition zone 104 can be designed to be the same.

[0046] The tapering zone 103 , the shrinking zone 102 and the expanding zone 101 are arranged in the Laval nozzle tuyere sleeve 200 , that is, the Laval nozzle tuyere sleeve 200 is a tuyere sleeve with a Laval nozzle structure. Compared with the traditional tuyere sleeve, the shrinking zone and the expanding zone are added, and the outlet seal of the main medium channel body 100 is connected to the tapering zone 103 .

[0047] The gradually expanding zone 101 can be understood as a combustion-supporting gas or fuel gas mixing zone (i.e., a mixing zone of the first auxiliary medium and the main medium). For ease of distinction, this mixing zone is defined as the first mixing zone. The design of this zone should ensure that the speed of the mixed gas (i.e., the first auxiliary medium) is equivalent to the speed of the main medium, and the speed deviation is controlled as much as possible between -10% and +10% to avoid eddy currents caused by large speed differences, which will affect the life of the blast furnace cyclotron zone and tuyere blowing device.

[0048] The tapered area 103 can be understood as a homogeneous gas mixing area of ​​the main medium (i.e., a mixing area of ​​the second auxiliary medium and the main medium). For the sake of distinction, this mixing area is defined as the second mixing area. This area should ensure that the outlet velocity of the mixed medium (i.e., the second auxiliary medium) is less than 20% of the velocity of the main medium to avoid the wear of the channel wall by particles. The constriction area 102 is a separation section between the first mixing area and the second mixing area.

[0049] The transition zone 104 is a transition zone where the tuyere blowing device is connected to the main pipeline of the blowing medium. The shrink pipe 105 is a shrink pipe designed to achieve uniform distribution of the main medium of each tuyere of the blast furnace.

[0050] like Figure 5 and Fig. 9As shown, in a specific embodiment of the present invention, the tapered zone 103, the constricted zone 102 and the gradually expanding zone 101 are coaxially arranged. For ease of understanding, the axis of the tapered zone 103, the constricted zone 102 and the gradually expanding zone 101 is defined as the first axis, and the axis of the main medium channel body 100, that is, the axis of the contraction tube 105 and the transition zone 104 is the second axis. In this embodiment, the angle a between the first axis and the second axis is 5° to 30°, that is, after the tuyere blowing device is installed on the furnace body, the Laval nozzle tuyere sleeve 200 is tilted downward so that the sprayed mixed medium can form a whirlpool in the furnace.

[0051] like Fig. 9 As shown, for ease of understanding, the axis of the outlet end of the first auxiliary medium channel 600 is defined as the third axis, and the angle b between the third axis and the second axis is 5° to 45°. It can be understood by those skilled in the art that the smaller the angle b between the third axis and the second axis, the lower the flow rate requirement for the first auxiliary medium sprayed out of the first auxiliary medium channel 600.

[0052] like Figure 8 and Fig.10 As shown, the main medium is pumped into the main medium channel by the main medium delivery pipeline at a speed of VZ1. After the main medium passes through the acceleration of the gradually contracting zone 103, the shrinking zone 102 and the gradually expanding zone 101, the main medium blowing speed at the outlet end of the main medium channel is VZ2.

[0053] The first auxiliary medium is pumped into the first auxiliary medium channel 600 by the first auxiliary medium delivery pipeline at a speed of VOZ1, and after the acceleration of the Laval pipe section 610, the first auxiliary medium injection speed at the outlet end of the first auxiliary medium channel 600 is VOZ2. It should be noted that the Laval pipe section 610 also includes a gradually contracting section 613, a narrowing section 612 and a gradually expanding section 611 that are connected in sequence along the injection direction of the first auxiliary medium.

[0054] The first auxiliary medium injection speed VOZ2 has a first direction component speed in the direction parallel to the first axis as VO2, and a second direction component speed in the direction perpendicular to the first axis as VO1. The first direction component speed VO2 should be close to the main medium injection speed VZ2. Specifically, the acceleration capability of the Laval tube section 610 can be adjusted by adjusting the structure of the Laval tube section 610, so that the first direction component speed VO2 is close to the main medium injection speed VZ2, and the speed deviation between the first direction component speed VO2 and the main medium injection speed VZ2 is controlled within the range of -10% to +10%, so as to prevent the two from generating eddy currents due to excessive speed deviation, causing local high temperature and affecting the life of the tuyere injection device.

[0055] In addition, since the second direction component velocity VO1 will impact the channel wall of the gradually expanding zone 101 if it is relatively large, the second direction component velocity VO1 is reduced as much as possible by controlling the angle b between the third axis and the second axis, and the second direction component velocity VO1 is controlled as much as possible within 15% of the first auxiliary medium blowing velocity VOZ2.

[0056] The second auxiliary medium blowing speed at the outlet end of the second auxiliary medium channel 500 is within 20% of the main medium blowing speed at the outlet end of the main medium channel. The second auxiliary medium blowing speed is controlled within 40m / s to prevent serious wear caused by a higher second auxiliary medium blowing speed.

[0057] The embodiment of the present invention further discloses a blast furnace, which includes the tuyere blowing device disclosed in the above embodiment. The blast furnace disclosed in the embodiment of the present invention has all the technical effects of the above tuyere blowing device because it has the above tuyere blowing device, which will not be described in detail herein.

[0058] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0059] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0060] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0061] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A tuyere blowing device, characterized in that: include: A main medium channel, wherein the outlet end of the main medium channel comprises a gradually contracting area (103), a shrinking area (102) and a gradually expanding area (101) which are connected in sequence along the blowing direction of the airflow; A first auxiliary medium channel (600), wherein an outlet end of the first auxiliary medium channel (600) is connected to the gradually expanding area (101), and the first auxiliary medium channel (600) has a Laval pipe section (610); A second auxiliary medium channel (500), wherein an outlet end of the second auxiliary medium channel (500) is connected to the tapered area (103).

2. The tuyere blowing device according to claim 1, characterized in that: There are a plurality of first auxiliary medium channels (600), and the outlet ends of the first auxiliary medium channels (600) are evenly arranged along the circumference of the gradually expanding zone (101).

3. The tuyere blowing device according to claim 1, characterized in that: The outlet end of the second auxiliary medium channel (500) is connected to the connection between the tapered area (103) and the necking area (102).

4. The tuyere blowing device according to claim 1, characterized in that: The main medium channel comprises: A main medium channel body (100), one end of the main medium channel body (100) being a main medium inlet; A Laval nozzle tuyere sleeve (200), wherein the tapered area (103), the shrinking area (102) and the gradually expanding area (101) are arranged on the Laval nozzle tuyere sleeve (200), and the outlet of the main medium channel body (100) is sealed and connected to the tapered area (103).

5. The tuyere blowing device according to claim 4, characterized in that: The gradually contracting zone (103), the shrinking zone (102) and the gradually expanding zone (101) are coaxially arranged, and the axis is a first axis, and the axis of the main medium channel body (100) is a second axis; The included angle a between the first axis and the second axis is 5°~30°.

6. The tuyere blowing device according to claim 5, characterized in that: The axis of the outlet end of the first auxiliary medium channel (600) is a third axis, and the angle b between the third axis and the second axis is 5° to 45°.

7. The tuyere blowing device according to claim 6, characterized in that: The main medium spraying speed at the outlet end of the main medium channel is VZ2, the first auxiliary medium spraying speed at the outlet end of the first auxiliary medium channel (600) is VOZ2, the first auxiliary medium spraying speed VOZ2 has a first direction component speed in a direction parallel to the first axis as VO2, and a second direction component speed in a direction perpendicular to the first axis as VO1; The speed deviation between the first direction component velocity VO2 and the main medium blowing velocity VZ2 is within the range of -10% to +10%.

8. The tuyere blowing device according to claim 7, characterized in that: The second direction component velocity VO1 is within 15% of the first auxiliary medium blowing velocity VOZ2.

9. The tuyere blowing device according to any one of claims 1 to 8, characterized in that: There are a plurality of first auxiliary medium channels (600), and the first auxiliary medium sprayed by each of the first auxiliary medium channels (600) includes a first type of medium and / or a second type of medium, the first type of medium is oxygen, and the second type of medium includes one of hydrogen, natural gas, coke oven gas and converter gas, and the first auxiliary medium sprayed by each of the first auxiliary medium channels (600) is the same, or, the first auxiliary medium sprayed by a portion of each of the first auxiliary medium channels (600) is the first type of medium, and the first auxiliary medium sprayed by another portion is the second type of medium; and / or, The main medium sprayed in the main medium channel is hot air, coal gas, mixed coal gas synthesis gas, ammonia and carbon dioxide synthesis gas or ammonia and hydrogen synthesis gas; and / or, The second auxiliary medium sprayed by the second auxiliary medium channel (500) is a gas of the same nature as the main medium or a mixed fluid of a gas of the same nature as the main medium and a solid powder, wherein the solid powder comprises at least one of calcium oxide powder, magnesium oxide powder, iron oxide powder, ferrous oxide powder, lime powder and dolomite powder; and / or, The second auxiliary medium spraying speed at the outlet end of the second auxiliary medium channel (500) is within 20% of the main medium spraying speed at the outlet end of the main medium channel.

10. A blast furnace, characterized in that: It comprises the tuyere blowing device as described in any one of claims 1 to 9.

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