Side Blowing Spray Gun

Abstract

The present invention provides a side-blowing spray gun, comprising a central tube, a sleeve, a premixing tube and a diverter. The inner wall surface of the central tube defines a central channel extending along its axial direction. The sleeve is sleeved on the central tube, and an outer channel is defined between the inner wall surface of the sleeve and the outer wall surface of the central tube. The premixing tube is connected to the sleeve, and the premixing tube includes a premixing zone, and the premixing zone is connected to both the central channel and the outer channel. The diverter is connected to the premixing tube, and the premixing tube is located between the diverter and the sleeve in the axial direction of the central tube, and the diverter includes a plurality of diverter holes extending along its axial direction, and each diverter hole is connected to the premixing zone. The side-blowing spray gun according to the embodiment of the present invention can make the fuel burn more fully, avoid fire in the furnace body, avoid flashback of the spray gun, and has the characteristics of high safety factor and excellent performance.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical smelting equipment, in particular to a side-blowing lance. Background Art

[0002] Side-blowing molten pool smelting is a process in which air, oxygen-enriched air, reducing agent or gas fuel is sprayed into the molten pool through tuyere on both sides of the furnace body or spray guns installed on both sides of the furnace body. The side-blowing gas jet is sprayed into the molten pool and rapidly stirs the molten pool, thereby accelerating the heat transfer, mass transfer and chemical reaction process in the molten pool. It is widely used in metal smelting fields such as lead, recycled lead, copper and slag.

[0003] The side-blowing spray gun in the related art is generally a sleeve structure, including a central tube and a sleeve sleeved outside the central tube. The inner channel defined by the central tube is used to spray combustion-supporting gas. The inner side of the sleeve and the outer side of the central tube have a certain gap, defining an annular seam, which serves as an outer channel for spraying fuel or reducing agent such as natural gas. After the inner and outer channels spray gases with different functions into the furnace respectively, the gases mix and burn near the spray gun outlet and stir the molten pool in the furnace to accelerate the heat transfer, mass transfer and chemical reaction process in the molten pool. This side-blowing spray gun with a general sleeve structure often has incomplete fuel combustion and fire in the side-blowing furnace body when the side-blowing smelting temperature is high and the side-blowing spray gun has a large amount of gas sprayed. There are great safety risks, which affect the smelting operation rate and increase the labor burden of workers, increase the production and operation costs of enterprises, and also limit the large-scale development of the side-blowing furnace body and the expansion of side-blowing smelting technology to the field of high-temperature metallurgy. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a side-blowing spray gun.

[0005] According to an embodiment of one aspect of the present invention, a side-blowing spray gun with a premixing structure includes: a central tube, the inner wall surface of the central tube defines a central channel extending along its axial direction; a sleeve, the sleeve is sleeved on the central tube, and an outer channel is defined between the inner wall surface of the sleeve and the outer wall surface of the central tube; a premixing tube, the premixing tube is connected to the sleeve, the premixing tube includes a premixing zone, and the premixing zone is connected to the central channel and the outer channel; a splitter, the splitter is connected to the premixing tube, the premixing tube is located between the splitter and the sleeve in the axial direction of the central tube, and the splitter includes a plurality of splitter holes extending along its axial direction, and each of the splitter holes is connected to the premixing zone.

[0006] According to the side-blowing spray gun of the embodiment of the present invention, the combustion-supporting gas and the natural gas are pre-mixed in the premixing zone of the premixing pipe before being sprayed out from the front end of the spray gun, and the premixed gas is then sprayed out through the diverter. Spraying after being fully mixed can avoid the phenomenon of incomplete combustion and furnace body flaming that is easy to occur when the combustion-supporting gas and the natural gas are sprayed out from different channels, so that the fuel burns more completely and the furnace body flaming is avoided.

[0007] In addition, the flashback phenomenon occurs because the speed of gas combustion is greater than the speed of airflow, and the flame will enter the central channel or the outer channel against the flow direction of the airflow. The premixed gas is sprayed out of the spray gun through multiple diversion holes on the diverter, and the premixed gas airflow is dispersed into multiple jets, which increases the circulation speed of the premixed gas airflow, can avoid the occurrence of the spray gun flashback phenomenon, improve the safety factor of the side-blowing spray gun, and reduce the safety risk of operators. In addition, the premixed gas airflow is sprayed into the interior of the molten pool at a relatively high speed, which can fully stir the melt in the furnace and promote the full progress of the reaction in the furnace. The side-blowing spray gun of the embodiment of the present invention is helpful to promote the large-scale development of the smelting furnace body, and also helps to promote the expansion of the side-blowing smelting technology into the field of high-temperature metallurgy.

[0008] Therefore, the side-blowing spray gun according to the embodiment of the present invention has the characteristics of high safety factor and excellent performance.

[0009] In addition, the side-blowing spray gun according to the present invention also has the following additional technical features:

[0010] In some embodiments of the present invention, the center tube includes a main body section and a dispersion section, the dispersion section is connected to the main body section, the inner wall surface of the main body section defines the central channel, the dispersion section is located between the main body section and the premixing tube in the axial direction of the center tube, the dispersion section includes a plurality of dispersion holes extending along its axial direction, the dispersion holes are connected to the central channel and the premixing zone, and optionally, the end face of the dispersion section adjacent to the premixing tube is flush with the end face of the sleeve adjacent to the premixing tube.

[0011] In some embodiments of the present invention, the plurality of diffuse holes include a main diffuse hole and a plurality of secondary diffuse holes, the main diffuse hole is located in the middle of the diffuse section, and the plurality of secondary diffuse holes are arranged around the main diffuse hole at intervals.

[0012] In some embodiments of the present invention, the cross-sectional area of ​​the premixing zone decreases in a direction adjacent to the flow splitter.

[0013] In some embodiments of the present invention, the premixing zone is truncated cone-shaped. Optionally, the cone angle of the premixing zone ranges from 3° to 10°.

[0014] In some embodiments of the present invention, a center tube air inlet duct and a casing air inlet duct are also included, wherein the center tube air inlet duct is connected to the end of the center tube away from the diverter, and the casing air inlet duct is connected to the end of the casing away from the diverter; the center tube air inlet duct includes a center tube seat, the center tube seat has a center tube air inlet channel, and the center tube air inlet channel is connected to the center channel; the casing air inlet duct includes a casing seat, the casing seat has a casing air inlet channel, and the casing air inlet channel is connected to the outer layer channel.

[0015] In some embodiments of the present invention, the sleeve seat is sleeved on the central tube, the sleeve seat and the central tube define a combustion chamber, and the sleeve air inlet channel is connected with the outer channel through the combustion chamber.

[0016] In some embodiments of the present invention, the central tube and the casing are coaxial.

[0017] In some embodiments of the present invention, the plurality of diverter holes include a main diverter hole and a plurality of secondary diverter holes, the main diverter hole is located in the middle of the diverter, and the plurality of secondary diverter holes are arranged at intervals around the main diverter hole.

[0018] Another aspect of the present invention provides a smelting furnace, characterized in that it comprises: a furnace body, the furnace body having a furnace chamber; and a side-blowing lance, the side-blowing lance being the side-blowing lance according to any one of claims 1-9, the side-blowing lance extending into the furnace chamber.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of a side-blowing spray gun according to an embodiment of the present invention.

[0021] Figure 2 FIG. 2 is an AA cross-sectional view of a side-blowing spray gun according to an embodiment of the present invention.

[0022] Figure 3 FIG. 2 is an AA cross-sectional view of a side-blowing spray gun according to another embodiment of the present invention.

[0023] Figure 4 BB is a cross-sectional view of a side-blowing spray gun according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Side blowing spray gun 100;

[0026] Central tube 1; central channel 11; main body section 12; diffusion section 13; diffusion hole 131; main diffusion hole 1311; multiple secondary diffusion holes 1312; first diffusion slot 132; third diffusion slot 133;

[0027] Casing 2; outer channel 21;

[0028] Premixing tube 3; premixing zone 31;

[0029] Diverter 4; diverter hole 41; main diverter hole 411; secondary diverter hole 412;

[0030] Center tube seat 5; center tube air inlet passage 51;

[0031] Casing pipe seat 6; casing air inlet channel 61; combustion chamber 62. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] The side-blowing spray gun 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0034] like Figure 1-Figure 4 As shown in FIG. 1 , the side-blowing spray gun 100 according to an embodiment of the present invention comprises a central tube 1, a sleeve 2, a premixing tube 3 and a flow divider 4. Figure 1 The direction indicated by the middle arrow defines the “front, rear” direction, and the “front” direction also refers to the gas ejection direction of the side-blowing spray gun 100 .

[0035] The inner wall surface of the central tube 1 defines a central channel 11 extending along its axial direction. Figure 1 As shown, the axial direction of the central tube 1 extends in the front-rear direction. Optionally, the central channel 11 is used for the circulation of combustion-supporting gas (such as air, oxygen or oxygen-enriched gas).

[0036] The sleeve 2 is sleeved on the central tube 1, and an outer channel 21 is defined between the inner wall of the sleeve 2 and the outer wall of the central tube 1. Optionally, the outer channel 21 is used for the circulation of fuel (such as natural gas) and / or reducing agent. For the convenience of description, natural gas is used as an example to refer to the gas circulating in the outer channel 21.

[0037] The premixing tube 3 is connected to the sleeve 2 and includes a premixing zone 31, which is connected to both the central channel 11 and the outer channel 21. The combustion-supporting gas ejected from the central channel 11 and the natural gas ejected from the outer channel 21 enter the premixing zone 31 together and are premixed in the premixing zone 31 to form a premixed gas.

[0038] The flow divider 4 is connected to the premixing tube 3, and the premixing tube 3 is located between the flow divider 4 and the sleeve 2 in the axial direction of the central tube 1. That is, the premixing tube 3 is located at the front end of the sleeve 2, and the flow divider 4 is located at the front end of the premixing tube 3. The flow divider 4 includes a plurality of flow divider holes 41 extending along its axial direction, and each flow divider hole 41 is connected to the premixing zone 31. The premixed gas in the premixing zone 31 is ejected from the front end of the flow divider 4 through the plurality of flow divider holes 41 to the side-blowing spray gun.

[0039] According to the side-blowing spray gun of the embodiment of the present invention, the combustion-supporting gas and the natural gas are pre-mixed in the premixing zone of the premixing pipe before being sprayed out from the front end of the spray gun, and the premixed gas is then sprayed out through the diverter. Spraying after being fully mixed can avoid the phenomenon of incomplete combustion and furnace body flaming that is easy to occur when the combustion-supporting gas and the natural gas are sprayed out from different channels, so that the fuel burns more completely and the furnace body flaming is avoided.

[0040] In addition, the flashback phenomenon occurs because the speed of gas combustion is greater than the speed of airflow, and the flame will enter the central channel or the outer channel against the flow direction of the airflow. The premixed gas is sprayed out of the spray gun through multiple diversion holes on the diverter, and the premixed gas airflow is dispersed into multiple jets, which increases the circulation speed of the premixed gas airflow, can avoid the occurrence of the spray gun flashback phenomenon, improve the safety factor of the side-blowing spray gun, and reduce the safety risk of operators. In addition, the premixed gas airflow is sprayed into the interior of the molten pool at a relatively high speed, which can fully stir the melt in the furnace and promote the full progress of the reaction in the furnace. The high-speed airflow can also cool the side-blowing spray gun, thereby extending the service life of the side-blowing spray gun. The side-blowing spray gun of the embodiment of the present invention helps to promote the large-scale development of the smelting furnace body, and also helps to promote the expansion of the side-blowing smelting technology into the field of high-temperature metallurgy.

[0041] Therefore, the side-blowing spray gun according to the embodiment of the present invention has the characteristics of high safety factor and excellent performance.

[0042] like Figure 1-Figure 4 As shown, the side-blowing spray gun 100 according to an embodiment of the present invention includes a central tube 1, a sleeve 2, a premixing tube 3 and a diverter 4. As an example, the central tube 1 and the sleeve 2 are both circular tubes, and the cross-section of the central channel 11 is circular. Preferably, the central tube 1 and the sleeve 2 are coaxial, that is, the central axis of the central tube 1 coincides with the central axis of the sleeve 2. Therefore, the outer channel 21 can be evenly distributed between the inner wall surface of the sleeve 2 and the outer wall surface of the central tube 1, that is, the cross-section of the outer channel 21 can be a circular ring. This design makes the structure of the side-blowing spray gun of the embodiment of the present invention more reasonable.

[0043] In some embodiments, Figure 1-Figure 4As shown, the central tube 1 includes a body section 12 and a dispersion section 13, and the dispersion section 13 is connected to the body section 12. The inner wall surface of the body section 12 defines a central channel 11. The dispersion section 13 is located between the body section 12 and the premixing tube 3 in the axial direction of the central tube 1. In other words, the dispersion section 13 is located at the front end of the body section 12.

[0044] The diffusion section 13 includes a plurality of diffusion holes 131 extending along its axial direction, and the diffusion holes 131 are connected to both the central channel 11 and the premixing zone 31, that is, the central channel 11 is connected to the premixing zone 31 through the plurality of diffusion holes 131. The combustion-supporting gas flowing in the central channel 11 is sprayed into the premixing zone 31 through the plurality of diffusion holes 131, and the combustion-supporting gas is divided into multiple jets by the diffusion holes 131, so that the flow rate of the combustion-supporting gas is increased, and then the flow rate of the premixed gas is increased, so that the occurrence of flashback can be avoided. At the same time, the faster gas flow speed enables the combustion-supporting gas to be more evenly mixed with the natural gas in the premixing zone 31.

[0045] Furthermore, the reasonable spacing and arrangement of the diffusion holes 131 can further prevent the flashback phenomenon of the spray gun. Figure 2 and Figure 3 As shown, the multiple diffuse holes 131 include a main diffuse hole 1311 and a plurality of secondary diffuse holes 1312. The main diffuse hole 1311 is located in the middle of the diffuse section 13. Optionally, the main diffuse hole 1311 is a circular hole, and the central axis of the main diffuse hole 1311 coincides with the central axis of the diffuse section 13. The multiple secondary diffuse holes 1312 are arranged at intervals around the main diffuse hole 1311. Preferably, the multiple secondary diffuse holes 1312 are arranged at equal intervals around the main diffuse hole 1311. Specifically, the cross-section of the main diffuse hole 1311 located in the middle of the diffuse section 13 is circular, and the cross-sections of the multiple secondary diffuse holes 1312 surrounding the main diffuse hole 1311 are fan-shaped. This design makes the structure of the diffuse section 13 and the arrangement of the diffuse holes 131 more reasonable.

[0046] In other embodiments, the cross section of the diffusion hole 131 may also be other reasonable shapes such as a rectangle or a triangle. It should be noted that those skilled in the art may select a design based on experience or actual needs, and no specific limitation is made here.

[0047] As an example, Figure 1 As shown, the end face of the dispersion section 13 adjacent to the premixing tube 3 is flush with the end face of the sleeve 2 adjacent to the premixing tube 3. That is, the front end face of the central tube 1 is flush with the front end face of the sleeve 2. This design makes the structure of the side-blowing spray gun 100 of the embodiment of the present invention more reasonable.

[0048] In one embodiment, the central tube 1 and the sleeve 2 are both circular tubes. The maximum outer diameter of the diffusion section 13 is smaller than the minimum inner diameter of the sleeve 2. In other words, the inner wall surface of the sleeve 2 does not contact the diffusion section 13.

[0049] As an example, Figure 2 As shown, the inner edge of the cross section of the sleeve 2 is circular, and the diameter of the circle is the minimum inner diameter of the sleeve 2. The outer wall surface of the dispersion section 13 has a plurality of first dispersion grooves 132. The first dispersion grooves 132 are formed by the outer wall surface of the dispersion section 13 being recessed toward the middle of the dispersion section 13 along the radial direction of the dispersion section 13. The first dispersion grooves 132 extend along the axial direction of the center tube 1, and the first dispersion grooves 132 penetrate the dispersion section 13 along the axial direction of the center tube 1. The size of the outer wall surface of the dispersion section 13 is the maximum outer diameter of the dispersion section 13. The natural gas in the outer layer channel 21 can be dispersed into multiple jets to a certain extent and injected into the premixing zone 31 through the action of the first dispersion grooves 132, and the gas flow velocity of the natural gas is increased. On the one hand, the increase in gas flow velocity can avoid the occurrence of flashback phenomenon, and on the other hand, the faster gas flow velocity enables the natural gas to be more evenly mixed with the combustion-supporting gas in the premixing zone 31.

[0050] Optionally, the extension direction of the first dispersion groove 132 is parallel to the axial direction of the central tube 1, that is, the first dispersion groove 132 can be a straight groove parallel to the axial direction of the central tube 1. Alternatively, the first dispersion groove 132 can be spiral, and the spiral first dispersion groove 132 spirals around the axial direction of the central tube 1. Preferably, the extension direction of the first dispersion groove 132 is parallel to the axial direction of the central tube 1, and a plurality of first dispersion grooves 132 are arranged at equal intervals around the dispersion section 13. This design makes the structure of the dispersion section 13 and the arrangement of the first dispersion grooves 132 more reasonable.

[0051] As an example (not shown in the figure), the outer edge of the cross section of the dispersion section 13 is circular, and the diameter of the circle is the maximum outer diameter of the dispersion section 13. The inner wall surface of the sleeve 2 is recessed in the radial direction of the sleeve 2 away from the middle of the sleeve 2 to form a plurality of second dispersion grooves. The size of the inner wall surface of the sleeve 2 is the minimum inner diameter of the sleeve 2. The function, shape and arrangement of the second dispersion grooves can refer to the first dispersion grooves 132, and will not be repeated here.

[0052] As an example, the first dispersion groove 132 is provided on the dispersion section 13, and the second dispersion groove is provided on the casing 2. Preferably, the plurality of first dispersion grooves 132 and the plurality of second dispersion grooves correspond one to one in the radial direction of the central tube 1. The radial direction of the central tube 1 may be consistent with the radial direction of the casing 2.

[0053] In another embodiment, the central tube 1 and the casing 2 are both circular tubes. The maximum outer diameter of the diffusion section 13 is equal to the minimum inner diameter of the casing 2, or in other words, the maximum outer diameter of the diffusion section 13 is consistent with the minimum inner diameter of the casing 2, so that the inner wall surface of the casing 2 is in contact with the diffusion section 13.

[0054] As an example, Figure 3As shown, the inner edge of the cross section of the sleeve 2 is circular, and the diameter of the circle is the minimum inner diameter of the sleeve 2. The outer wall surface of the dispersion section 13 has a plurality of third dispersion grooves 133. The third dispersion grooves 133 extend along the axial direction of the central tube 1. The third dispersion grooves 133 are formed by the outer wall surface of the dispersion section 13 being recessed toward the middle of the dispersion section 13 along the radial direction of the dispersion section 13. The inner wall surface of the sleeve 2 covers the outer end of each third dispersion groove 133 to form a dispersion channel, and the outer channel 21 is connected to the premixing zone 31 through the plurality of the dispersion channels, that is, the natural gas in the outer channel 21 enters the premixing zone 31 through the plurality of the dispersion channels. The natural gas in the outer channel 21 can be thoroughly dispersed into multiple jets and injected into the premixing zone 31 through the action of the third dispersion grooves 133, and the speed of the natural gas gas flow is further improved. On the one hand, the increase in gas flow speed can avoid the occurrence of flashback phenomenon, and on the other hand, the faster gas flow speed enables the natural gas to be more evenly mixed with the combustion-supporting gas in the premixing zone 31. The shape and arrangement of the third diffusion grooves 133 may refer to the first diffusion grooves 132 , and will not be described in detail here.

[0055] As an example, the outer edge of the cross section of the dispersion section 13 is circular, and the inner wall surface of the casing 2 is recessed in the radial direction of the casing 2 away from the middle of the casing 2 to form a plurality of fourth dispersion grooves (not shown in the figure). The outer wall surface of the dispersion section 13 covers the inner end of each fourth dispersion groove to form a dispersion channel, and the outer layer channel 21 is connected to the premixing zone 31 through the plurality of the dispersion channels, that is, the natural gas in the outer layer channel 21 enters the premixing zone 31 through the plurality of the dispersion channels. The function, shape and arrangement of the fourth dispersion groove can refer to the third dispersion groove 133, and will not be repeated here.

[0056] As an example, the third dispersion groove 133 is provided on the dispersion section 13, and the fourth dispersion groove is provided on the casing 2. Preferably, the plurality of third dispersion grooves 133 and the plurality of fourth dispersion grooves correspond to each other in the radial direction of the central tube 1.

[0057] Optionally, the cross-sections of the first dispersion slot 132, the second dispersion slot, the third dispersion slot 133 and the fourth dispersion slot may be rectangular, trapezoidal or triangular. It should be noted that those skilled in the art may select the design according to experience or actual needs, and no specific limitation is made here.

[0058] like Figure 1As shown, the cross-sectional area of ​​the premixing zone 31 decreases in the direction adjacent to the diverter 4. That is, the cross-sectional area of ​​the premixing zone 31 decreases from the back to the front, that is, the cross-sectional area of ​​the premixing zone 31 decreases along the gas jet direction. Preferably, the premixing zone 31 is a tapered structure, which means that the cross-sectional area of ​​the premixing zone 31 gradually and evenly decreases in the direction adjacent to the diverter 4. This structure allows the jet velocity of the premixed gas in the premixing zone 31 to gradually increase along the gas jet direction, so that the premixed gas can be sprayed into the molten pool at a higher speed, fully stirring the melt in the side-blown furnace and promoting the full reaction in the furnace.

[0059] Preferably, the premixing zone 31 is truncated cone-shaped, that is, the cross section of the premixing zone 31 is circular. Optionally, the cone angle of the premixing zone is in the range of 3°-10°.

[0060] like Figure 1-Figure 4 As shown, the diverter 4 includes a plurality of diverter holes 41 extending along its axial direction, and each diverter hole 41 is connected to the premixing zone 31. The premixed gas in the premixing zone 31 is ejected from the front end of the diverter 4 to the side-blowing spray gun through the plurality of diverter holes 41. The premixed gas is divided into multiple jets by the plurality of diverter holes 41, so that the airflow velocity of the premixed gas is further improved. The airflow is sprayed into the molten pool at a higher speed, which can fully stir the melt in the side-blowing furnace and promote the full reaction in the furnace. The increase in the airflow velocity can avoid the occurrence of tempering. In addition, the high-speed airflow can also cool the side-blowing spray gun, thereby extending the service life of the side-blowing spray gun.

[0061] Furthermore, the reasonable spacing and arrangement of the diverter holes 41 can further prevent the flashback phenomenon of the spray gun. Optionally, the multiple diverter holes 41 include a main diverter hole 411 and multiple secondary diverter holes 412, and the main diverter hole 411 is located in the middle of the diverter 4. Optionally, the main diverter hole 411 is a circular hole, and the central axis of the main diverter hole 411 coincides with the central axis of the diverter 4. Multiple secondary diverter holes 412 are arranged at intervals around the main diverter hole 411. Preferably, multiple secondary diverter holes 412 are arranged at equal intervals around the main diverter hole 411. Specifically, the cross-section of the main diverter hole 411 located in the middle of the diverter 4 is circular, and the cross-sections of the multiple secondary diverter holes 412 surrounding the main diverter hole 411 are fan-shaped. This design makes the structure of the diverter 4 and the arrangement of the diverter holes 41 more reasonable.

[0062] In other embodiments, the cross-section of the diverter hole 41 may also be other reasonable shapes such as a rectangle or a triangle, which will not be described in detail here.

[0063] Preferably, the central tube 1, the sleeve 2, the premixing tube 3 and the flow divider 4 are coaxial, that is, the central axis of the central tube 1, the central axis of the sleeve 2, the central axis of the premixing tube 3 and the central axis of the flow divider 4 coincide. This design makes the structure of the side-blowing spray gun of the embodiment of the present invention more reasonable.

[0064] Optionally, the central tube 1, the sleeve 2, the premixing tube 3 and the splitter 4 are all made of stainless steel.

[0065] like Figure 1-Figure 4 As shown, the side-blowing spray gun of the embodiment of the present invention further includes a central tube air inlet pipeline and a casing air inlet pipeline, wherein the central tube air inlet pipeline is connected to the end of the central tube 1 away from the flow divider 4, and the casing air inlet pipeline is connected to the end of the casing 2 away from the flow divider 4. That is, the central tube air inlet pipeline is connected to the rear end of the central tube 1, and the casing air inlet pipeline is connected to the rear end of the casing 2. The central tube air inlet pipeline is used to introduce combustion-supporting gas into the central channel 11, and the casing air inlet pipeline is used to introduce natural gas into the outer layer channel 21.

[0066] As an example, the central tube air intake duct includes a central tube seat 5 , which has a central tube air intake passage 51 , and the central tube air intake passage 51 is communicated with the central passage 11 .

[0067] As an example, the sleeve air inlet duct includes a sleeve seat 6 , which has a sleeve air inlet passage 61 , and the sleeve air inlet passage 61 is communicated with the outer layer passage 21 .

[0068] As an example, the casing seat 6 is sleeved on the central tube 1, and the casing seat 6 and the central tube 1 define a gas chamber 62, and the casing air inlet channel 61 is connected with the outer channel 21 through the gas chamber 62. Natural gas enters the gas chamber 62 from the casing air inlet channel 61, and then enters the outer channel 21. The provision of the gas chamber 62 can greatly reduce gas resistance, reduce energy consumption and cost.

[0069] Another embodiment of the present invention provides a smelting furnace, including a furnace body and a side-blowing lance 100. The side-blowing lance 100 is the side-blowing lance 100 in the embodiment of the present invention. The furnace body has a furnace cavity. The side-blowing lance 100 extends into the furnace cavity to spray combustion-supporting gas, natural gas and other gases into the furnace cavity.

[0070] The smelting furnace provided by this embodiment of the present invention has the characteristics of high safety factor and excellent performance.

[0071] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A side-blowing spray gun, characterized in that: include: A central tube, wherein the inner wall surface of the central tube defines a central channel extending along the axial direction thereof; A sleeve, wherein the sleeve is sleeved on the central tube, and an outer layer channel is defined between the inner wall surface of the sleeve and the outer wall surface of the central tube; A premixing tube, the premixing tube is connected to the sleeve, the premixing tube includes a premixing zone, and the premixing zone is connected to both the central channel and the outer channel; A flow splitter, the flow splitter is connected to the premixing tube, the premixing tube is located between the flow splitter and the sleeve in the axial direction of the central tube, the flow splitter comprises a plurality of flow splitting holes extending along the axial direction thereof, each of the flow splitting holes is communicated with the premixing zone; The center tube includes a body section and a dispersion section, the dispersion section is connected to the body section, the inner wall surface of the body section defines the center channel, the dispersion section is located between the body section and the premixing tube in the axial direction of the center tube, the maximum outer diameter of the dispersion section is smaller than the minimum inner diameter of the casing, the dispersion section includes a plurality of dispersion holes extending along its axial direction, the dispersion holes are connected to both the center channel and the premixing zone, the plurality of dispersion holes include a main dispersion hole and a plurality of secondary dispersion holes, the main dispersion hole is located in the middle of the dispersion section, and the plurality of secondary dispersion holes are arranged around the main dispersion hole at intervals.

2. The side-blowing spray gun according to claim 1, characterized in that: The end surface of the dispersion section adjacent to the premixing tube is flush with the end surface of the sleeve adjacent to the premixing tube.

3. The side-blowing spray gun according to claim 1, characterized in that: The cross-sectional area of ​​the premixing zone decreases in a direction adjacent to the flow splitter.

4. The side-blowing spray gun according to claim 3, characterized in that: The premixing zone is in the shape of a truncated cone, and the cone angle of the premixing zone ranges from 3° to 10°.

5. The side-blowing spray gun according to claim 1, characterized in that: It also includes a central tube air inlet pipeline and a casing air inlet pipeline, wherein the central tube air inlet pipeline is connected to the end of the central tube away from the flow divider, and the casing air inlet pipeline is connected to the end of the casing away from the flow divider; The central tube air inlet pipeline comprises a central tube seat, the central tube seat has a central tube air inlet passage, and the central tube air inlet passage is connected with the central passage; The sleeve air inlet pipeline comprises a sleeve pipe seat, and the sleeve pipe seat has a sleeve air inlet channel, and the sleeve air inlet channel is communicated with the outer layer channel.

6. The side-blowing spray gun according to claim 5, characterized in that: The sleeve seat is sleeved on the central tube, the sleeve seat and the central tube define a combustion chamber, and the sleeve air inlet channel is communicated with the outer layer channel through the combustion chamber.

7. The side-blowing spray gun according to claim 1, characterized in that: The central tube and the casing are coaxial.

8. The side-blowing spray gun according to claim 1, characterized in that: The plurality of flow-dividing holes include a main flow-dividing hole and a plurality of auxiliary flow-dividing holes. The main flow-dividing hole is located in the middle of the flow diverter, and the plurality of auxiliary flow-dividing holes are arranged at intervals around the main flow-dividing hole.

9. A smelting furnace, characterized in that: include: A furnace body, wherein the furnace body has a furnace cavity; and A side-blowing spray gun, wherein the side-blowing spray gun is a side-blowing spray gun according to any one of claims 1-8, and the side-blowing spray gun extends into the furnace cavity.

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