Tuyere device for blowing coal gas, oxygen and pulverized coal

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a tuyere device for blowing coal gas, oxygen and pulverized coal, which comprises a tuyere body and a coal gas blowing pipe, a central channel is arranged in the tuyere body, an oxygen channel and an oxygen loop are arranged in the tuyere body, the oxygen channel is communicated with the oxygen loop, the oxygen loop is communicated with an annular through groove, and the annular through groove is communicated with the coal gas blowing pipe. An annular through groove is formed in the tuyere body, the annular through groove is communicated with the central channel, the tuyere body is provided with a concave spherical surface used for being in spherical fit with a coal gas blowing pipe, a coal powder gun used for spraying coal powder is inserted into the coal gas blowing pipe, and the coal powder spraying end of the coal powder gun extends to the position 20-50 mm in front of the annular through groove at the angle of 10-15 degrees. The problems that when a traditional tuyere device carries out injection operation, oxygen is not evenly distributed in a channel, so that the ironmaking efficiency is low, and a tuyere is damaged are solved. According to the invention, by arranging the oxygen annular channel and the annular through groove, oxygen can be uniformly distributed in a central channel in the tuyere, and is subjected to violent premixing and combustion reaction with high-temperature coal gas and pulverized coal before entering a blast furnace, so that high-efficiency production is realized.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking, and in particular to a tuyere device for injecting coal gas, oxygen and coal powder. Background Art

[0002] In the steel production process, the iron-making process accounts for 70% of the energy consumption. Therefore, reducing the carbon consumption in the iron-making process has become a key breakthrough in promoting the reduction of coal in the steel industry. The traditional blast furnace technology has undergone hundreds of years of development and has made remarkable achievements in improving thermal efficiency, expanding production capacity and improving the technical system. It has become an important pillar in the field of steel production.

[0003] The blast furnace tuyere device is a key component in blast furnace ironmaking and the main channel for fuels such as pulverized coal, coal gas and oxygen to enter the blast furnace. By spraying coal gas, coal powder and oxygen into the blast furnace, it provides the required heat and reducing agents for the iron ore reduction reaction in the furnace, thereby maintaining a continuous and stable chemical reaction process in the blast furnace and ensuring the normal production of molten iron.

[0004] When the traditional tuyere device is in the injection operation, the oxygen injection method is to directly blow oxygen or simply mix it with coal powder and coal gas and inject it, which causes the oxygen to be extremely unevenly distributed in the channel, resulting in huge differences in oxygen concentration in different areas. When it meets the injected coal powder, it seriously disrupts the movement trajectory and distribution pattern of the coal powder and coal gas, making it impossible for the coal powder to be evenly dispersed in the furnace, causing an imbalance in the temperature field in the furnace, and the dispersed coal powder is easy to wash the tuyere and cause it to be damaged, thereby seriously weakening the stability and balance of the iron ore reduction reaction, resulting in low ironmaking efficiency, and a significant increase in energy consumption and production costs. Summary of the invention

[0005] The object of the present invention is to provide a tuyere device for injecting coal gas, oxygen and coal powder, so as to solve the problem that in the traditional tuyere device, oxygen is extremely unevenly distributed in the channel during the injection operation, seriously disrupting the movement trajectory and distribution pattern of coal powder and coal gas, resulting in low ironmaking efficiency, wear of the tuyere by coal powder, and a substantial increase in energy consumption and production costs.

[0006] To achieve the above-mentioned purpose, the basic scheme provided by the present invention is: a tuyere device for spraying coal gas, oxygen and coal powder, comprising a tuyere body and a coal gas blowpipe, a central channel is opened in the tuyere body, the central channel is located in the center of the tuyere body, an oxygen channel and an oxygen ring are arranged in the tuyere body, the oxygen channel is connected with the oxygen ring, an annular groove for connecting with the oxygen ring is opened on the central channel, the annular groove is connected with the central channel, a cooling water channel is arranged in the tuyere body, a cooling water inlet, a cooling water outlet and an oxygen nozzle are respectively arranged on the rear end face of the tuyere body, the cooling water inlet and the cooling water outlet are connected with the cooling water channel, the oxygen nozzle is connected with the oxygen channel, a concave spherical surface is arranged on the tuyere body for spherically matching the coal gas blowpipe, and a coal powder gun for spraying coal powder is inserted in the coal gas blowpipe.

[0007] The working principle of the present invention is as follows: during the blast furnace production process, first, high-temperature coal gas and coal powder enter the central channel of the tuyere body through the coal gas blowpipe and coal powder gun, and at the same time, oxygen enters the oxygen annular channel through the oxygen channel in the tuyere body, and then enters the annular groove from the oxygen annular channel and sprays into the central channel, and is premixed with the high-temperature coal gas and coal powder before being sprayed into the blast furnace to complete a series of oxidation-reduction reactions in the furnace. At the same time, cooling water enters the cooling water channel from the cooling water inlet, and after cooling and heat exchange, the cooling water flows out from the cooling water outlet, and circulates in sequence to achieve cooling of the tuyere body.

[0008] The beneficial effects of the present invention are as follows: by arranging an oxygen ring channel and an annular through groove, oxygen can be evenly distributed in the central channel of the tuyere, and violent premixing and combustion reactions occur with the high-temperature coal gas and coal powder before entering the blast furnace, the speed and temperature are greatly improved, the kinetic energy of the gas entering the blast furnace is increased, the blast furnace hearth is activated, and the blast furnace forward indicators are improved; the gas blowpipe is inserted at a specific angle and position, so that the coal powder can be quickly mixed, heated and cracked with the oxygen and high-temperature coal gas at an approximately parallel angle, thereby significantly improving the utilization efficiency of coal injection.

[0009] Option 2 is the preferred option of the basic option. The angle at which the pulverized coal gun is inserted into the gas blowpipe is 10-15°, and the coal injection end of the pulverized coal gun is 20-50mm away from the oxygen outlet end of the annular groove. The pulverized coal is sprayed at an angle of 10-15°, which will not be affected by the oxygen flow and will be sprayed into the blast furnace at a horizontal angle without causing the tuyere to be worn out due to the pulverized coal being blown off course by the oxygen flow. At the same time, since the pulverized coal gun head maintains a distance of 20-50mm from the oxygen injection ring outlet, it can also ensure that the pulverized coal gun will not be burned by oxygen.

[0010] Option three is the preferred basic option. The angle between the annular groove and the central channel is ≤45°, which facilitates the injection of oxygen into the central channel at a suitable angle, thereby promoting the full mixing and reaction of oxygen with coal gas and coal powder.

[0011] Option 4 is the preferred option of the basic option. The speed of the medium in the central channel is 200-250m / s, which facilitates a smoother reaction and helps improve combustion efficiency and blast furnace condition stability.

[0012] Option 5 is a preferred option of the basic option. The inner diameter of the connection point between the annular groove and the oxygen annular channel is one-fourth of the inner diameter of the oxygen annular channel, and the inner diameter of the connection point between the annular groove and the central channel is smaller than the inner diameter of the connection point between the annular groove and the oxygen annular channel. The annular groove can be made into a tapered shape, which can effectively increase the injection flow rate of oxygen and the rate of entering the central channel, realize uniform mixing of oxygen and coal gas, and make the deviation between the injection speed of oxygen and the speed of the medium in the central channel less than 30m / s.

[0013] Scheme 6, which is a preferred embodiment of Scheme 5, the calculation formula of the inner diameter of the annular groove and the central channel is as follows:

[0014]

[0015] Where: H1 represents the inner diameter of the connection between the annular groove and the central channel, unit: m; Q represents the oxygen flow rate at the tuyere, unit: m 3 / s; d represents the cross-sectional diameter of the connection between the annular groove and the central channel, in m; π represents pi, with a value of 3.14; p 绝对 It indicates the absolute pressure in the annular groove, unit: bar; θ indicates the speed of oxygen injection from the annular groove, unit: m / s; the inner diameter of the connection between the annular groove and the central channel is determined according to the oxygen flow rate, the cross-sectional diameter of the connection between the annular groove and the central channel, the absolute pressure and the injection oxygen speed, which can accurately match the oxygen injection parameters with the working conditions of the central channel, ensure the injection effect and distribution uniformity of oxygen in the central channel, make oxygen and coal gas fully contact and react, and improve the combustion reaction efficiency.

[0016] Scheme 7, which is a preferred embodiment of Scheme 5, when the oxygen ring channel is used in different blast furnaces, the inner diameter of the oxygen ring channel is different, and the calculation formula of the inner diameter of the oxygen ring channel is as follows:

[0017]

[0018] Where: D is the inner diameter of the oxygen ring, unit: m; Q is the flow rate of oxygen in the oxygen ring, unit: m 3 / s; V represents the target operating flow rate of the oxygen ring, unit: m / s; π represents the pi, value: 3.14; p represents the pressure in the oxygen ring, unit: bar; For different blast furnaces, the inner diameter of the oxygen ring is calculated according to the oxygen flow rate and target flow rate in the oxygen ring, so as to achieve precise adaptation of the tuyere device and the blast furnace, ensure the stability of the oxygen flow rate in the oxygen ring, and improve the overall efficiency and economic benefits of blast furnace ironmaking.

[0019] Option eight, which is the preferred option of the basic option, is characterized in that a nitrogen sealing groove is provided on the convex spherical surface of the gas blowpipe, and a nitrogen inlet is provided at the rear end of the tuyere body, and the nitrogen inlet is connected to the nitrogen sealing groove; the nitrogen sealing groove on the convex spherical surface of the gas blowpipe is connected to the nitrogen inlet at the rear end of the tuyere body, forming a reliable secondary sealing structure, further enhancing the sealing performance of the gas blowpipe and the tuyere body, and effectively preventing leakage of high-temperature gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereoscopic diagram of a tuyere device for injecting coal gas, oxygen and coal powder according to the present invention;

[0021] Figure 2 It is a left view of a tuyere device for injecting coal gas, oxygen and coal powder according to the present invention;

[0022] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0023] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0024] Figure 5 It is a partial cross-sectional view of a tuyere device for injecting coal gas, oxygen and coal powder according to the present invention;

[0025] Figure 6 The present invention is a schematic structural diagram of a tuyere device for spraying coal gas, oxygen and coal powder, in which a coal gas blowpipe and a coal powder gun are connected to a tuyere body. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below through specific embodiments:

[0027] The reference numerals in the drawings of the specification include: 1. tuyere body; 2. center channel; 3. oxygen channel; 4. oxygen ring channel; 5. annular through groove; 6. cooling water channel; 7. cooling water inlet; 8. cooling water outlet; oxygen nozzle; 10. gas blowpipe; 101. nitrogen sealing groove; 102. nitrogen inlet; 11. coal powder gun.

[0028] Example 1

[0029] like Figures 1 to 6As shown: a tuyere device for injecting coal gas, oxygen and coal powder, comprising a tuyere body 1 and a coal gas blowing pipe 10, a central channel 2 is opened in the tuyere body 1, the central channel 2 is located at the center of the tuyere body 1, the flow rate of the medium in the central channel 2 is 250m / s, an oxygen channel 3 and an oxygen ring 4 are arranged in the tuyere body 1, the oxygen channel 3 is connected with the oxygen ring 4, an annular groove 5 for connecting with the oxygen ring 4 is opened on the central channel 2, the annular groove 5 is connected with the central channel 2, the angle a between the annular groove 5 and the central channel 2 is 45°, the inner diameter of the place where the annular groove 5 and the central channel 2 are connected is smaller than the inner diameter of the place where the annular groove 5 and the oxygen ring 4 are connected, and the calculation formula of the inner diameter of the place where the annular groove 5 and the central channel 2 are connected is as follows:

[0030]

[0031] Where: H1 represents the inner diameter of the connection between the annular groove and the central channel, unit: m; Q represents the oxygen flow rate at the tuyere, unit: m 3 / s; d represents the cross-sectional diameter of the connection between the annular groove and the central channel, in m; π represents pi, with a value of 3.14; p 绝对 It indicates the absolute pressure in the annular groove, unit: bar; θ indicates the speed of oxygen injection from the annular groove, unit: m / s.

[0032] In the actual production process, such as: 2500m 3 The oxygen flow rate of the hydrogen-rich carbon cycle oxygen blast furnace tuyere is 0.55m 3 / s, the cross-sectional diameter of the connection between the annular groove and the central channel is 0.120m, the speed of the annular groove 5 spraying oxygen is 180m / s, and the absolute pressure of the annular groove is 3.5bar, then the inner diameter of the connection between the annular groove 5 and the oxygen ring channel 4 is:

[0033]

[0034]

[0035] H1=0.0023m

[0036] H1=2.3mm

[0037] When the oxygen ring 4 is applied to different blast furnaces, the inner diameter of the oxygen ring 4 is different. The calculation formula of the inner diameter of the oxygen ring 4 is as follows:

[0038]

[0039] Where: D is the inner diameter of the oxygen ring, unit: m; Q is the flow rate of oxygen in the oxygen ring, unit: m 3 / s; V represents the target operating flow rate of the oxygen ring, unit: m / s; π represents pi, value: 3.14; p represents the pressure in the oxygen ring, unit: bar.

[0040] In the actual production process, such as: 2500m 3 The oxygen flow rate in the oxygen loop 4 of the hydrogen-rich carbon circulating oxygen blast furnace is 0.55m 3 / s, the target working flow rate of oxygen ring channel 4 is 100m / s, and the pressure in oxygen ring channel 4 is 3.5bar, then the inner diameter of oxygen ring channel 4 is:

[0041]

[0042]

[0043] D=0.448m

[0044] D=44.8mm

[0045] Therefore, the inner diameter of the annular groove 5 connecting with the central channel 2 is 2.3 mm, and the inner diameter of the annular groove 5 connecting with the oxygen ring channel 4 is greater than 2.3 mm. The inner diameter of the annular groove 5 and the oxygen ring 4 Therefore, the deviation between the speed of the oxygen injected from the annular groove 5 and the speed of the medium in the central channel 2 is less than 30 m / s.

[0046] A cooling water channel 6 is provided in the tuyere body 1, and a cooling water inlet 7, a cooling water outlet 8 and an oxygen nozzle 9 are respectively provided on the rear end face of the tuyere body 1, the cooling water inlet 7 and the cooling water outlet 8 are communicated with the cooling water channel 6, and the oxygen nozzle 9 is communicated with the oxygen channel 3. A concave spherical surface for spherically matching the gas blowpipe 10 is provided on the tuyere body 1, and a nitrogen sealing groove 101 is provided on the convex spherical surface of the gas blowpipe 10. A nitrogen inlet 102 is provided at the rear end of the tuyere body 1, and the nitrogen inlet 102 is communicated with the nitrogen sealing groove 101, wherein the convex spherical surface of the gas blowpipe 10 adopts a high-temperature resistant stainless steel casting, and the joint between the tuyere body 1 and the gas blowpipe 10 is a copper concave spherical surface, and the two are sealed once by hard steel and soft copper spherical surfaces, and secondary sealing is achieved by the nitrogen sealing groove 101.

[0047] A pulverized coal gun 11 for injecting pulverized coal is inserted into the gas blowpipe 10. The angle at which the pulverized coal gun 11 is inserted into the gas blowpipe 10 is 15°. The coal injection end of the pulverized coal gun 11 is 40 mm away from the oxygen outlet end of the annular groove 5, and the coal injection end of the pulverized coal gun 11 is kept on the same horizontal axis as the central channel 2. In this way, the pulverized coal injected into the tuyere will not be affected by the oxygen flow, and will be injected into the blast furnace at a horizontal angle, without causing the tuyere to be worn out due to the pulverized coal being blown off by the oxygen flow. In addition, since the coal injection end of the pulverized coal gun 11 is 40 mm away from the oxygen injection annular outlet, it can also be ensured that the pulverized coal gun 11 will not be burned by oxygen. At the same time, there is a certain distance between the annular groove 5 and the front end surface of the tuyere body 1. By setting a certain distance, the effect of premixing oxygen with pulverized coal and coal gas can be achieved.

[0048] The implementation method of this embodiment is as follows: during the blast furnace production process, first, high-temperature coal gas and coal powder enter the central channel 2 of the tuyere body 1 through the coal gas blowpipe 10 and the coal powder gun 11, and at the same time, oxygen enters the oxygen annular channel 4 through the oxygen channel 3 in the tuyere body 1, and then enters the annular groove 5 from the oxygen annular channel 4 and sprays into the central channel 2 at an angle of 45°, and is premixed with the high-temperature coal gas and coal powder and then sprayed into the blast furnace to complete a series of oxidation-reduction reactions in the furnace. In this process, nitrogen enters the nitrogen sealing groove 101 from the nitrogen inlet 102, and the nitrogen entering the gas sealing groove 101 presses against the tuyere body 1, thereby realizing the secondary sealing of the high-temperature coal gas. At the same time, cooling water enters the cooling water channel 6 from the cooling water inlet 7, and after the cooling water is cooled and heat-exchanged, it flows out from the cooling water outlet 8, and circulates in sequence to realize the cooling of the tuyere body 1.

[0049] Example 2

[0050] like Figures 1 to 6 As shown: a tuyere device for injecting coal gas, oxygen and coal powder, comprising a tuyere body 1 and a coal gas blowing pipe 10, a central channel 2 is opened in the tuyere body 1, the central channel 2 is located at the center of the tuyere body 1, the flow rate of the medium in the central channel 2 is 250m / s, an oxygen channel 3 and an oxygen ring 4 are arranged in the tuyere body 1, the oxygen channel 3 is connected with the oxygen ring 4, an annular groove 5 for connecting with the oxygen ring 4 is opened on the central channel 2, the annular groove 5 is connected with the central channel 2, the angle a between the annular groove 5 and the central channel 2 is 45°, the inner diameter of the place where the annular groove 5 and the central channel 2 are connected is smaller than the inner diameter of the place where the annular groove 5 and the oxygen ring 4 are connected, and the calculation formula of the inner diameter of the place where the annular groove 5 and the central channel 2 are connected is as follows:

[0051]

[0052] Where: H1 represents the inner diameter of the connection between the annular groove and the central channel, unit: m; Q represents the oxygen flow rate at the tuyere, unit: m 3 / s; d represents the cross-sectional diameter of the connection between the annular groove and the central channel, in m; π represents the circumference of a circle, with a value of 3.14; p 绝对 It indicates the absolute pressure in the annular groove, unit: bar; θ indicates the speed of oxygen injection from the annular groove, unit: m / s.

[0053] In the actual production process, such as: 430m 3 The oxygen flow rate of hydrogen-rich carbon cycle oxygen blast furnace tuyere is 0.35m 3 / s, the cross-sectional diameter of the connection between the annular groove and the central channel is 0.1m, the speed of the annular groove 5 spraying oxygen is 180m / s, and the absolute pressure of the annular groove 5 is 3bar, then the inner diameter of the connection between the annular groove 5 and the oxygen ring channel 4 is:

[0054]

[0055]

[0056] H1=0.0021m

[0057] H1=2.1mm

[0058] When the oxygen ring 4 is applied to different blast furnaces, the inner diameter of the oxygen ring 4 is different. The calculation formula of the inner diameter of the oxygen ring 4 is as follows:

[0059]

[0060] Where: D is the inner diameter of the oxygen ring, unit: m; Q is the flow rate of oxygen in the oxygen ring, unit: m 3 / s; V represents the target operating flow rate of the oxygen ring, unit: m / s; π represents pi, value: 3.14; p represents the pressure in the oxygen ring, unit: bar.

[0061] In the actual production process, such as: 430m 3 The oxygen flow rate in the oxygen loop 4 of the hydrogen-rich carbon circulating oxygen blast furnace is 0.35m 3 / s, the target working flow rate of oxygen ring channel 4 is 80m / s, and the pressure in oxygen ring channel 4 is 2.5bar, then the inner diameter of oxygen ring channel 4 is:

[0062]

[0063]

[0064] D=0.431m

[0065] D=43.1mm

[0066] Therefore, the inner diameter of the annular groove 5 connecting with the central channel 2 is 2.1 mm, then the inner diameter of the annular groove 5 connecting with the oxygen ring channel 4 is greater than 2.1 mm, and the inner diameter H2 of the annular groove 5 connecting with the oxygen ring channel 4 is The inner diameter of the annular groove 5 and the oxygen ring 4 Therefore, the deviation between the speed of the oxygen injected from the annular groove 5 and the speed of the medium in the central channel 2 is less than 30 m / s.

[0067] A cooling water channel 6 is provided in the tuyere body 1, and a cooling water inlet 7, a cooling water outlet 8 and an oxygen nozzle 9 are respectively provided on the rear end face of the tuyere body 1, the cooling water inlet 7 and the cooling water outlet 8 are communicated with the cooling water channel 6, and the oxygen nozzle 9 is communicated with the oxygen channel 3. A concave spherical surface for spherically matching the gas blowpipe 10 is provided on the tuyere body 1, and a nitrogen sealing groove 101 is provided on the convex spherical surface of the gas blowpipe 10. A nitrogen inlet 102 is provided at the rear end of the tuyere body 1, and the nitrogen inlet 102 is communicated with the nitrogen sealing groove 101, wherein the convex spherical surface of the gas blowpipe 10 adopts a high-temperature resistant stainless steel casting, and the joint between the tuyere body 1 and the gas blowpipe 10 is a copper concave spherical surface, and the two are sealed once by hard steel and soft copper spherical surfaces, and secondary sealing is achieved by the nitrogen sealing groove 101.

[0068] A pulverized coal gun 11 for injecting pulverized coal is inserted into the gas blowpipe 10. The angle at which the pulverized coal gun 11 is inserted into the gas blowpipe 10 is 15°. The coal injection end of the pulverized coal gun 11 is 40 mm away from the oxygen outlet end of the annular groove 5, and the coal injection end of the pulverized coal gun 11 is kept on the same horizontal axis as the central channel 2. In this way, the pulverized coal injected into the tuyere will not be affected by the oxygen flow, and will be injected into the blast furnace at a horizontal angle, without causing the tuyere to be worn out due to the pulverized coal being blown off by the oxygen flow. In addition, since the coal injection end of the pulverized coal gun 11 is 40 mm away from the oxygen injection annular outlet, it can also be ensured that the pulverized coal gun 11 will not be burned by oxygen. At the same time, there is a certain distance between the annular groove 5 and the front end surface of the tuyere body 1. By setting a certain distance, the effect of premixing oxygen with pulverized coal and coal gas can be achieved.

[0069] The implementation method of this embodiment is as follows: during the blast furnace production process, first, high-temperature coal gas and coal powder enter the central channel 2 of the tuyere body 1 through the coal gas blowpipe 10 and the coal powder gun 11, and at the same time, oxygen enters the oxygen annular channel 4 through the oxygen channel 3 in the tuyere body 1, and then enters the annular groove 5 from the oxygen annular channel 4 and sprays into the central channel 2 at an angle of 45°, and is premixed with the high-temperature coal gas and coal powder and then sprayed into the blast furnace to complete a series of oxidation-reduction reactions in the furnace. In this process, nitrogen enters the nitrogen sealing groove 101 from the nitrogen inlet 102, and the nitrogen entering the gas sealing groove 101 presses against the tuyere body 1, thereby realizing the secondary sealing of the high-temperature coal gas. At the same time, cooling water enters the cooling water channel 6 from the cooling water inlet 7, and after the cooling water is cooled and heat-exchanged, it flows out from the cooling water outlet 8, and circulates in sequence to realize the cooling of the tuyere body 1.

[0070] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A tuyere device for injecting coal gas, oxygen and coal powder, characterized in that: The invention comprises a tuyere body (1) and a gas blowpipe (10), wherein the tuyere body (1) is provided with a central channel (2), wherein the central channel (2) is located at the center of the tuyere body (1), wherein an oxygen channel (3) and an oxygen ring channel (4) are provided in the tuyere body (1), wherein the oxygen channel (3) is connected to the oxygen ring channel (4), wherein the central channel (2) is provided with an annular groove (5) for connecting to the oxygen ring channel (4), and wherein the tuyere body (1) is provided with a cooling water channel (5). The rear end surface of the tuyere body (1) is respectively provided with a cooling water inlet (7), a cooling water outlet (8) and an oxygen nozzle (9); the cooling water inlet (7) and the cooling water outlet (8) are in communication with the cooling water channel (6); the oxygen nozzle (9) is in communication with the oxygen channel (3); the tuyere body (1) is provided with a concave spherical surface for spherically matching a coal gas blowpipe (10); a coal powder gun (11) for spraying coal powder is inserted into the coal gas blowpipe (10).

2. A tuyere device for injecting coal gas, oxygen and coal powder according to claim 1, characterized in that: The angle at which the pulverized coal gun (11) is inserted into the gas blowpipe (10) is 10-15°, and the coal spraying end of the pulverized coal gun (11) is 20-50 mm away from the oxygen outlet end of the annular groove (5).

3. The tuyere device for injecting coal gas, oxygen and coal powder according to claim 1, characterized in that: The included angle a between the annular through groove (5) and the central channel (2) is ≤45°.

4. The tuyere device for injecting coal gas, oxygen and coal powder according to claim 1, characterized in that: The velocity of the medium in the central channel (2) is 200-250 m / s.

5. The tuyere device for injecting coal gas, oxygen and coal powder according to claim 1, characterized in that: The inner diameter of the connection point between the annular groove (5) and the oxygen ring channel (4) is one quarter of the inner diameter of the oxygen ring channel (4), and the inner diameter of the connection point between the annular groove (5) and the central channel (2) is smaller than the inner diameter of the connection point between the annular groove (5) and the oxygen ring channel (4).

6. A tuyere device for injecting coal gas, oxygen and coal powder according to claim 5, characterized in that: The calculation formula of the inner diameter of the connection point between the annular groove (5) and the central channel (2) is as follows: Where: H1 represents the inner diameter of the connection between the annular groove and the central channel, unit: m; Q represents the oxygen flow rate at the tuyere, unit: m 3 / s; d represents the cross-sectional diameter of the connection between the annular groove and the central channel, in m; π represents pi, with a value of 3.14; p 绝对 It indicates the absolute pressure in the annular groove, unit: bar; θ indicates the speed of oxygen injection from the annular groove, unit: m / s.

7. The tuyere device for injecting coal gas, oxygen and coal powder according to claim 5, characterized in that: When the oxygen ring channel (4) is applied to different blast furnaces, the inner diameter of the oxygen ring channel (4) is different. The calculation formula of the inner diameter of the oxygen ring channel (4) is as follows: Where: D is the inner diameter of the oxygen ring, unit: m; Q is the flow rate of oxygen in the oxygen ring, unit: m 3 / s; V represents the target operating flow rate of the oxygen ring, unit: m / s; π represents pi, value: 3.14; p represents the pressure in the oxygen ring, unit: bar.

8. The tuyere device for injecting coal gas, oxygen and coal powder according to claim 1, characterized in that: A nitrogen sealing groove (101) is provided on the convex spherical surface of the gas blowing pipe (10), and a nitrogen inlet (102) is provided at the rear end of the tuyere body (1), and the nitrogen inlet (102) is communicated with the nitrogen sealing groove (101).

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