Multi-fuel heat accumulating type burner and industrial furnace

Abstract

The utility model provides a multi-fuel regenerative burner and industrial furnace, multi-fuel regenerative burner includes: regenerative cavity (1), regenerative burner shell (2), burner outer chamber (3), natural gas burner (4) and fuel oil burner (5), regenerative cavity (1) is built in regenerative burner shell (2), natural gas burner (4) is semi-embedded in regenerative burner shell (2), fuel oil burner (5) is built in regenerative burner shell (2). And a fuel oil burner (5) is semi-embedded into the natural gas burner (4). According to the multi-fuel heat accumulating type burner, blast furnace gas, natural gas and fuel oil can be respectively used, or the blast furnace gas, the natural gas and the fuel oil can be simultaneously used in proportion. The utility model further discloses an industrial furnace adopting the multi-fuel heat accumulating type burner. The industrial furnace has the advantages of a blast furnace gas furnace, a natural gas furnace and a fuel oil furnace.

Description

Technical Field

[0001] The utility model relates to a regenerative burner technology used for heating in the field of industrial furnaces, in particular to a multi-fuel regenerative burner and an industrial furnace. Background Art

[0002] At present, the regenerative burners used in gas-fired industrial furnaces at home and abroad are of various forms, but all of them use a single gas as fuel. High calorific value gases, such as natural gas, have high use costs, and long-term use is not conducive to enterprises reducing costs. Low calorific value gases, such as blast furnace gas, are by-products of other production processes and have low use costs. With the deepening of energy conservation and emission reduction work, the low calorific value gas cannot be produced continuously and stably, causing the industrial furnace to shut down. Therefore, developing a multi-fuel regenerative burner is a problem that technical personnel in this field are eager to solve. Utility Model Content

[0003] The utility model aims to solve the problem that a traditional regenerative burner for an industrial furnace uses a single fuel gas as fuel, and proposes a multi-fuel regenerative burner which can use blast furnace gas, natural gas and fuel oil respectively or use the two fuels simultaneously in proportion.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a multi-fuel regenerative burner, comprising: a regenerative cavity, a regenerative burner shell, a burner outer chamber, a natural gas burner and a fuel oil burner, the regenerative burner shell has a built-in regenerative cavity, the regenerative burner shell is half-embedded with a natural gas burner, and the natural gas burner is half-embedded with a fuel oil burner;

[0005] The regenerative cavity comprises a refractory casting cavity and a refractory fiber blanket. The refractory casting cavity is formed by casting the casting in the regenerative burner shell; a blast furnace gas left chamber and a blast furnace gas right chamber are arranged side by side on the left and right sides of the refractory casting cavity; a natural gas burner mounting hole is arranged in the middle of the blast furnace gas left chamber and the blast furnace gas right chamber; a refractory fiber blanket is arranged between the refractory casting cavity and the inner wall of the regenerative burner shell;

[0006] The regenerative burner shell comprises a wall connection plate, a first air pipeline, a second air pipeline, an outer shell plate and a natural gas burner mounting plate, and the regenerative burner shell is fixed to the furnace through the wall connection plate; the inlets of the first air pipeline and the second air pipeline are respectively arranged above and below the outer shell plate, and the first air pipeline and the second air pipeline are respectively located at the upper and lower sides of the natural gas burner mounting hole, and the first air pipeline and the second air pipeline are combustion-supporting air pipelines for proportioning various gases; the natural gas burner mounting plate is arranged on a side of the outer shell plate away from the furnace, and cooperates with the natural gas burner mounting hole to connect and fix the natural gas burner;

[0007] The burner outer chamber includes a fixed grid, a round tube and a shell. The two burner outer chambers are respectively buckled on the side of the outer shell plate away from the furnace, and correspond to the left chamber of blast furnace gas and the right chamber of blast furnace gas. A fixed grid is arranged on the side of the shell close to the outer shell plate to prevent part of the honeycomb body in the cavity from falling off. A round tube for external connection to the blast furnace gas pipeline is arranged on the top of the shell.

[0008] The natural gas burner includes a toothed disc, a central air duct, a natural gas pipe, a first mounting flange, a second mounting flange, a third mounting flange and a fourth mounting flange. The first mounting flange is fixed in the middle of the central air duct. The natural gas burner is inserted into the natural gas burner mounting hole and fixed to the natural gas burner mounting plate through the first mounting flange to achieve fixation of the natural gas burner to the heat storage burner shell; a second mounting flange is arranged on the side wall at one end of the central air duct, and the second mounting flange is used for external air pipeline; the natural gas pipe is inserted into the central air duct, and the gap between the central air duct and the natural gas pipe is the central air channel of the natural gas pipe. A toothed disc is arranged at one end of the natural gas pipe located in the central air duct, and a fourth mounting flange is arranged at one end of the natural gas pipe located outside the central air duct; the third mounting flange is fixed on the side wall of the natural gas pipe close to the fourth mounting flange, and the natural gas pipe and the third mounting flange constitute a natural gas channel. The third mounting flange is used for external natural gas pipeline, and the fourth mounting flange is used for fixing to the oil burner.

[0009] The fuel oil burner comprises: a nozzle, a swirler, a nozzle, a first oil pipe, a flange mounting plate, a second oil pipe, an oil nozzle, a plug, a first compressed air pipe, an inner core, and a second compressed air pipe;

[0010] The first oil pipe is threadedly connected with the second oil pipe, and the nozzle is fixed at one end of the first oil pipe away from the second oil pipe. The nozzle is a nozzle for light diesel oil and compressed air. The light diesel oil is atomized by high-pressure air at the nozzle, and the atomized oil gas is mixed with the combustion-supporting air and then fully burned.

[0011] The second compressed air pipe is located in the first oil pipe, one end of the first compressed air pipe is embedded in the inner side of the second oil pipe, the first compressed air pipe is threadedly connected to the second compressed air pipe, and the gap between the oil pipes (the first oil pipe and the second oil pipe) and the compressed air pipes (the first compressed air pipe and the second compressed air pipe) is a fuel oil channel; the outer side of the nozzle is connected to the swirler, and the inner side is threadedly connected to the second compressed air pipe, and the inner core is fixed to the inner side of the nozzle; the flange mounting plate is fixed on the side wall in the middle of the second oil pipe, and the fuel oil burner is embedded in the natural gas burner, and is fixed to the fourth mounting flange of the natural gas burner through the flange mounting plate, so as to realize the fixation of the fuel oil burner and the natural gas burner.

[0012] The oil nozzle is arranged on the side wall of the second oil pipe and is the inlet for the fuel oil to enter the fuel oil burner. The oil nozzle is communicated with the fuel oil channel.

[0013] Furthermore, the casting material is a low-cement casting material, which has the characteristics of low porosity, good stability and high strength. Unlike other casting methods, low-cement casting can be carried out at room temperature, is simple to operate and has low cost.

[0014] Furthermore, three nozzles are arranged in the left chamber of the blast furnace gas, which are parallel to each other, in the same direction, offset to the right, and the angle between the nozzle and the horizontal direction is 10-15°. The nozzle offset angle is calculated according to the structural dimensions in the furnace and the gas flow rate, etc., and the actual use angle is calculated.

[0015] Furthermore, the structure of the right chamber of the blast furnace gas is similar to that of the left chamber, and three nozzles are arranged therein, the nozzles are parallel to each other, in the same direction, and the nozzles are offset to the left, and the angle between the nozzles and the horizontal direction is 10-15°. The nozzle offset angle is calculated according to the structural dimensions in the furnace and the gas flow rate, etc., and the actual use angle is calculated.

[0016] Furthermore, the regenerative cavity further comprises firebricks and honeycombs. A row of firebricks is installed in the left blast furnace gas chamber and the right blast furnace gas chamber, and a number of honeycombs are installed in sequence behind the firebricks.

[0017] The honeycomb bodies are installed closely in the horizontal direction. If there are gaps, they are filled with fiber blankets to ensure that the high-temperature flue gas passes through the honeycomb holes of each heat storage body. The honeycomb holes of the heat storage body are aligned in the longitudinal direction to ensure that the flue gas passes smoothly and reduce the flue gas resistance.

[0018] Furthermore, a hanging plate is provided between the wall connecting plate and the outer shell plate, and the hanging plate is used to strengthen the strength of the wall connecting plate and can be used as a hanging point at the same time.

[0019] Furthermore, the center line of the pipe section of the first air pipeline and the second air pipeline is 2-4° to the horizontal line, preferably 3°, so that the air nozzle and the gas nozzle form a reasonable angle, and the fully mixed air and gas are mixed through airflow impact, and the combustion efficiency is high, the flame intensity is high, and the heating speed is improved;

[0020] Furthermore, a flange sealing plate and a sealing gasket are provided between the shell edge and the outer shell plate, so as to facilitate the maintenance and repair of the heat storage body inside the burner;

[0021] Furthermore, a flange is provided at one end of the circular tube away from the shell;

[0022] Furthermore, the toothed disc is provided with an air swirl port, a natural gas outlet and an oil burner mounting hole. The air swirl port is serrated, and the angle between the teeth and the axis of the toothed disc is 10-20°, preferably 15° (along the thickness direction). The number and size of the teeth are determined by the flow rate and flow velocity. There are two natural gas outlets, one is an inner hole serrated hole, the toothed hole is a gas outlet hole, and the other is a small hole that is equidistant and closely spaced. The number and size of the holes are determined by the gas flow rate and flow velocity. Generally, under the condition of meeting the process restrictions, the more the number, the more uniform the gas ejected. The more fully the flame burns. The angle between the center of each hole and the axis of the toothed disc is 10-20°, preferably 15°. The specific angle needs to be calculated based on other conditions such as the furnace size and the required flame length. The holes are not parallel to each other, and the extension line of the hole center is compared to the axis of the toothed disc.

[0023] Furthermore, the cyclone is composed of 8 cyclone blades and 6 cyclone ports, and the cyclone ports are evenly arranged in the tangent direction of the diameter. The cyclone is installed in the front part of the burner. When the light diesel oil flows through the cyclone, the axial motion is changed into the rotational motion, and the liquid is thrown around by the inertial centrifugal force. With the help of compressed air, the 90-degree wide-angle design of the nozzle and the acceleration of the spray of the atomized oil by the cyclone blades, the atomized fuel oil is fully mixed with the air to form a stable and efficient ignition combustion area, while ensuring that the flame length is moderate.

[0024] Furthermore, a first sealing gasket is provided between the nozzle and the first oil pipe, which is used to prevent fuel oil (including but not limited to light diesel oil) from leaking from the threaded connection between the nozzle and the first oil pipe.

[0025] Furthermore, a second sealing gasket is provided between the nozzle and the second compressed air pipe to prevent air from leaking from the threaded connection between the nozzle and the second compressed air pipe.

[0026] Furthermore, a third sealing gasket is provided at the connection between the first oil pipe and the second oil pipe to prevent fuel oil from leaking from the threaded connection between the first oil pipe and the second oil pipe.

[0027] Furthermore, the inner core is provided with a plurality of air acceleration holes, and the compressed air passes through the plurality of small holes and is ejected along the annular channel between the inner core and the nozzle.

[0028] Furthermore, the fuel oil burner also includes a first positioning plate and a second positioning plate. The first positioning plate is one or more and is arranged between the first oil pipe and the natural gas pipe. The second positioning plate is one or more and is arranged between the second compressed air pipe and the first oil pipe. The first positioning plate and the second positioning plate have the function of increasing the rigidity of the steel pipe.

[0029] Another purpose of the utility model is to disclose an industrial furnace, which adopts the multi-fuel regenerative burner.

[0030] The utility model multi-fuel regenerative burner is a regenerative burner suitable for fuels with large calorific value differences. Compared with the prior art, it has the following advantages:

[0031] Blast furnace gas is a by-product of the blast furnace smelting process of metallurgical enterprises. A large amount of heat from the blast furnace fuel is transferred to the blast furnace gas. Therefore, the annealing furnace equipment of metallurgical enterprises can reasonably use blast furnace gas as fuel, which directly and effectively reduces production costs and greatly improves the interests of production enterprises.

[0032] As a fuel, natural gas has high calorific value, pollution-free combustion products, low environmental pressure, and high safety of use. It is a fuel sought after by many companies.

[0033] Fuel oil is a secondary synthetic product of petroleum and is particularly suitable for use in countries with abundant petroleum resources.

[0034] The utility model multi-fuel regenerative burner can use blast furnace gas, natural gas and fuel oil respectively or use the two fuels simultaneously in proportion. The industrial furnace using the utility model multi-fuel regenerative burner can have the advantages of blast furnace gas, natural gas and fuel oil furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is the right side view of the multi-fuel regenerative burner;

[0036] Figure 2 It is a front cross-sectional view of a multi-fuel regenerative burner;

[0037] Figure 3 A top cross-sectional view of a multi-fuel regenerative burner;

[0038] Figure 4 It is the right side view of the heat storage chamber;

[0039] Figure 5 It is a front cross-sectional view of the heat storage cavity;

[0040] Figure 6 It is a front cross-sectional view of the heat storage cavity;

[0041] Figure 7 for Figure 6 BB direction diagram

[0042] Figure 8 It is the right view of the regenerative burner shell;

[0043] Fig. 9 It is a front sectional view of the shell of the regenerative burner;

[0044] Fig.10 It is the right view of the outer chamber of the burner;

[0045] Fig.11 It is the front view of the outer chamber of the burner;

[0046] Fig.12 This is the main sectional view of the natural gas burner;

[0047] Fig.13 This is a top view of a natural gas burner;

[0048] Fig.14 The main cross-sectional view of the fuel oil burner

[0049] Fig.15 It is the front view of the gear disc;

[0050] Fig.16 It is a left sectional view of the gear disc;

[0051] Fig.17 A top view of the gear disc. DETAILED DESCRIPTION

[0052] The present invention is further described below with reference to the embodiments:

[0053] Example 1

[0054] This embodiment discloses a multi-fuel regenerative burner, such as Figure 1-17 As shown, it comprises: a regenerative cavity 1, a regenerative burner shell 2, a burner outer chamber 3, a natural gas burner 4 and a fuel oil burner 5, wherein the regenerative burner shell 2 has a built-in regenerative cavity 1, the regenerative burner shell 2 is half-embedded with the natural gas burner 4, and the natural gas burner 4 is half-embedded with the fuel oil burner 5;

[0055] The regenerative cavity comprises a refractory casting cavity 11, a refractory fiber blanket 12, a fire-blocking brick 13 and a honeycomb 14. The refractory casting cavity 11 is formed by casting a casting material in a regenerative burner shell 2; the casting material is a low-cement casting material, which has the characteristics of low porosity, good stability and high strength. Unlike other casting methods, low-cement casting can be carried out at room temperature, which is simple to operate and low in cost. The refractory casting cavity 11 is provided with a blast furnace gas left chamber and a blast furnace gas right chamber in parallel on the left and right; a natural gas burner mounting hole is provided in the middle of the blast furnace gas left chamber and the blast furnace gas right chamber; three nozzles are provided in the blast furnace gas left chamber, which are parallel to each other, in the same direction, offset to the right, and the angle between the nozzle and the horizontal direction is 10-15°. The structure of the blast furnace gas right chamber is similar to that of the left chamber, and the nozzle is offset to the left, and the angle between the nozzle and the horizontal direction is 10-15°. The nozzle offset angle is calculated according to the structural dimensions and gas flow rate in the furnace, and the actual use angle is calculated. A refractory fiber blanket 12 is arranged between the refractory casting material cavity 11 and the inner wall of the regenerative burner shell 2. Before casting, a layer of refractory fiber blanket 12 is installed on the inner side wall of the regenerative burner shell 2, as far as between the shell and the cavity. The refractory fiber blanket 12 has a good thermal insulation effect. Under the same thickness, the thermal insulation effect is better than that of casting material products. After casting, the casting material, the refractory fiber blanket 12 and the regenerative burner shell 2 are integrally formed, and the structure is stable and durable. A row of fire-blocking bricks 13 are installed in the left chamber of blast furnace gas and the right chamber of blast furnace gas (along the radial direction). The main function of the fire-blocking bricks 13 is to form a stable fluid structure for the medium in the cavity through the evenly distributed through holes on the fire-blocking bricks 13, which is helpful for heat exchange. At the same time, it can limit the collapse of the honeycomb structure in the cavity due to the impact of gas pressure. After the fire-blocking bricks, several honeycombs are installed in sequence to form a set of regenerative cavity. The honeycomb body has a small cube shape, and its cross section is composed of several regular hexagonal holes arranged in sequence. Each hole is parallel to each other, which effectively improves the heat exchange efficiency.

[0056] The heat storage burner shell 2 is mainly a carrier for bearing and connecting other components. The heat storage burner shell 2 includes a wall connection plate 21, a hanging plate 22, a first air pipeline 23, a second air pipeline 24, an outer shell plate 25 and a natural gas burner mounting plate 26. The heat storage burner shell 2 is welded and fixed to the furnace through the wall connection plate 21. A hanging plate 22 is arranged between the wall connection plate 21 and the outer shell plate 25. The hanging plate 22 is used to strengthen the strength of the wall connection plate 21 and can also be used as a hanging point. The inlets of the first air pipeline 23 and the second air pipeline 24 are respectively arranged above and below the outer shell plate 25. The first air pipeline 23 and the second air pipeline 24 are respectively located at On the upper and lower sides of the natural gas burner mounting hole, the first air pipeline 23 and the second air pipeline 24 are combustion-supporting air pipelines for proportioning the various gases; the center lines of the first air pipeline 23 and the second air pipeline 24 are 2-4° to the horizontal line, preferably 3°, in order to form a reasonable angle between the air nozzle and the gas nozzle, and to mix the fully mixed air and gas through airflow impact, so that the combustion efficiency is high, the flame intensity is high, and the heating speed is improved; the natural gas burner mounting plate 26 is arranged on the side of the outer shell plate 25 away from the furnace, and cooperates with the natural gas burner mounting hole to connect and fix the natural gas burner 4;

[0057] The burner outer chamber 3 includes a fixed grid 33, a round tube 34 and a shell 35. The two burner outer chambers 3 are respectively buckled on the side of the outer shell plate 25 away from the furnace, and correspond to the left chamber of blast furnace gas and the right chamber of blast furnace gas. A flange sealing plate and a sealing gasket 31 are arranged between the edge of the shell 35 and the outer shell plate 25 to facilitate the maintenance and repair of the heat storage body inside the burner; a fixed grid 33 is arranged on the side of the shell 35 close to the outer shell plate 25 to prevent part of the honeycomb body in the cavity from falling off. A round tube 34 for external connection to the blast furnace gas pipeline is arranged on the top of the shell 35, and a flange 32 is arranged on the end of the round tube 34 away from the shell 35;

[0058] The natural gas burner 4 includes a toothed disc 41, a central air duct 42, a natural gas pipe 43, a first mounting flange 44, a second mounting flange 45, a third mounting flange 46 and a fourth mounting flange 47. The first mounting flange 44 is fixed in the middle of the central air duct 42. The natural gas burner 4 is inserted into the natural gas burner mounting hole and fixed to the natural gas burner mounting plate 26 through the first mounting flange 44 to achieve the fixation of the natural gas burner 4 to the heat storage burner housing 2. A second mounting flange 45 is arranged on the side wall of one end of the central air duct 42. The second mounting flange 45 is used to connect an external air pipeline. ; The natural gas pipe 43 is inserted into the central air duct 42, and the gap in the central air duct 42 is the central air channel of the natural gas pipe 43. A toothed disc 41 is provided at one end of the natural gas pipe 43 located in the central air duct 42, and a fourth mounting flange 47 is provided at one end of the natural gas pipe 43 located outside the central air duct 42; a third mounting flange 46 is fixed on the side wall of the natural gas pipe 43 close to the fourth mounting flange 47, and the natural gas pipe 43 and the third mounting flange 46 constitute a natural gas channel, the third mounting flange 46 is used for external natural gas pipeline, and the fourth mounting flange 47 is used for fixing to the oil burner.

[0059] The toothed disc 41 is provided with an air swirl port 411, a natural gas outlet 412 and an oil burner mounting hole 413. The air swirl port 411 is serrated, and the teeth are at an angle of 15° (along the thickness direction) with the axis of the toothed disc. The number and size of the teeth are determined by the flow rate and flow velocity. The natural gas outlet 412 has two locations, one is an inner hole serrated hole, the toothed hole is the gas outlet hole, and the other is a small hole that is evenly spaced and closely arranged. The number and size of the holes are determined by the gas flow rate and flow velocity. Generally, under the condition of meeting the process restrictions, the more the number, the more uniform the gas ejected, and the more fully the flame burns. The center of each hole is at an angle of 15° with the axis of the toothed disc. The specific angle needs to be calculated based on other conditions such as the furnace size and the required flame length. The holes are not parallel to each other, and the extension line of the hole center is compared to the axis of the toothed disc. The oil burner mounting hole 413 is used to penetrate the oil burner.

[0060] The fuel oil burner 5 comprises: a nozzle 51; a swirler 52; a first sealing gasket 53; a nozzle 54; a first oil pipe 55; a first positioning plate 56; a flange mounting plate 57; a second oil pipe 58; an oil nozzle 59; a plug 510; a first compressed air pipe 511; an inner core 512; a second sealing gasket 513; a second compressed air pipe 514; a second positioning plate 515; and a third sealing gasket 516.

[0061] The first oil pipe 55 is threadedly connected to the second oil pipe 58. A third sealing gasket 516 is provided at the connection between the first oil pipe 55 and the second oil pipe 58 to prevent fuel oil from leaking from the threaded connection between the first oil pipe 55 and the second oil pipe 58. The nozzle 51 is fixed at one end of the first oil pipe 55 away from the second oil pipe 58. The nozzle 51 is a nozzle for light diesel oil and compressed air. The light diesel oil is atomized by high-pressure air at the nozzle, and the atomized oil and gas are mixed with the combustion-supporting air and then fully burned. A first sealing gasket 53 is provided between the nozzle 51 and the first oil pipe 55 to prevent fuel oil (including but not limited to light diesel oil) from leaking from the threaded connection between the nozzle 51 and the first oil pipe 55.

[0062] The second compressed air pipe 514 is located inside the first oil pipe 55, one end of the first compressed air pipe 511 is embedded inside the second oil pipe 58, the first compressed air pipe 511 is threadedly connected to the second compressed air pipe 514, and the gap between the oil pipes (the first oil pipe 55 and the second oil pipe 58) and the compressed air pipes (the first compressed air pipe 511 and the second compressed air pipe 514) is a fuel oil channel; the edges of the second oil pipe 58 and the first compressed air pipe 511 are sealed by a plug 510; the outer side of the nozzle 54 is connected to the swirler 52, and the inner side is threadedly connected to the second compressed air pipe 514, the inner core 512 is fixed to the inner side of the nozzle 54, and the inner core 512 is provided with 6 air acceleration holes, and the compressed air passes through the 6 small holes and is ejected along the annular channel between the inner core 512 and the nozzle 54. A second sealing gasket 513 is provided between the nozzle 54 and the second compressed air pipe 514 to prevent air from leaking from the threaded connection between the nozzle 54 and the second compressed air pipe 514.

[0063] The swirler 52 is composed of 8 swirl plates and 6 swirl ports, which are evenly arranged in the tangent direction of the diameter. The swirler 52 is installed in front of the burner 54. When the light diesel oil flows through the swirler, the axial motion is changed into rotational motion, and the liquid is thrown around by the inertial centrifugal force. With the help of compressed air, the 90-degree wide-angle design of the nozzle and the acceleration of the swirl plates on the spraying of the atomized oil, the atomized fuel oil is fully mixed with the air to form a stable and efficient ignition combustion area, while ensuring that the flame length is moderate.

[0064] There are one or more first positioning plates 56, which are arranged between the first oil pipe 55 and the natural gas pipe 43. There are one or more second positioning plates 515, which are arranged between the second compressed air pipe 514 and the first oil pipe 55. The first positioning plates 56 and the second positioning plates 515 have the function of increasing the rigidity of the steel pipe.

[0065] The flange mounting plate 57 is fixed on the side wall in the middle of the second oil pipe 58, and the fuel oil burner 5 is embedded in the natural gas burner 4, and is fixed to the fourth mounting flange 47 of the natural gas burner 4 through the flange mounting plate 57, so that the fuel oil burner 5 and the natural gas burner 4 are fixed.

[0066] The oil nozzle 59 is arranged on the side wall of the second oil pipe 58 and is the entrance for the fuel oil to enter the fuel oil burner 5. The oil nozzle 59 is connected to the fuel oil channel.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A multi-fuel regenerative burner, characterized in that: include: A regenerative cavity (1), a regenerative burner shell (2), a burner outer chamber (3), a natural gas burner (4) and a fuel oil burner (5), wherein the regenerative burner shell (2) has the regenerative cavity (1) built in, the regenerative burner shell (2) is half-embedded with the natural gas burner (4), and the fuel oil burner (5) is half-embedded in the natural gas burner (4); The regenerative cavity comprises a refractory casting cavity (11) and a refractory fiber blanket (12); the refractory casting cavity (11) is formed by casting a casting material in a regenerative burner shell (2); a blast furnace gas left chamber and a blast furnace gas right chamber are arranged in parallel on the left and right sides of the refractory casting cavity (11); a natural gas burner mounting hole is arranged between the blast furnace gas left chamber and the blast furnace gas right chamber; a refractory fiber blanket (12) is arranged between the refractory casting cavity (11) and the inner wall of the regenerative burner shell (2); The regenerative burner shell (2) comprises a wall connection plate (21), a first air pipeline (23), a second air pipeline (24), an outer shell plate (25) and a natural gas burner mounting plate (26); the regenerative burner shell (2) is fixed to the furnace via the wall connection plate (21); the inlets of the first air pipeline (23) and the second air pipeline (24) are respectively arranged above and below the outer shell plate (25); the first air pipeline (23) and the second air pipeline (24) are respectively located at the upper and lower sides of the natural gas burner mounting hole; the natural gas burner mounting plate (26) is arranged on a side of the outer shell plate (25) away from the furnace and matches the natural gas burner mounting hole; The burner outer chamber (3) comprises a fixed grid (33), a round tube (34) and a shell (35); the two burner outer chambers (3) are respectively buckled on the side of the outer shell plate (25) away from the furnace, and correspond to the left chamber of blast furnace gas and the right chamber of blast furnace gas; the shell (35) is provided with a fixed grid (33) on the side close to the outer shell plate (25); and the top of the shell (35) is provided with a round tube (34) for externally connecting to a blast furnace gas pipeline; The natural gas burner (4) comprises a toothed disc (41), a central air duct (42), a natural gas pipe (43), a first mounting flange (44), a second mounting flange (45), a third mounting flange (46) and a fourth mounting flange (47); the first mounting flange (44) is fixed in the middle of the central air duct (42); the second mounting flange (45) is arranged on the side wall at one end of the central air duct (42); the natural gas pipe (43) is passed through the central air duct (42); the toothed disc (41) is arranged at one end of the natural gas pipe (43) located in the central air duct (42); the fourth mounting flange (47) is arranged at one end of the natural gas pipe (43) located outside the central air duct (42); the third mounting flange (46) is fixed on the side wall of the natural gas pipe (43) close to the fourth mounting flange (47); The fuel oil burner (5) comprises a nozzle (51), a swirler (52), a nozzle (54), a first oil pipe (55), a flange mounting plate (57), a second oil pipe (58), an oil nozzle (59), a first compressed air pipe (511), an inner core (512) and a second compressed air pipe (514); the first oil pipe (55) is threadedly connected to the second oil pipe (58), the nozzle (51) is fixed to one end of the first oil pipe (55) away from the second oil pipe (58); the second compressed air pipe (514) is located at the first oil pipe (55), one end of the first compressed air pipe (511) is embedded in the inner side of the second oil pipe (58), the first compressed air pipe (511) is threadedly connected to the second compressed air pipe (514), the outer side of the nozzle (54) is connected to the swirler (52), and the inner side is threadedly connected to the second compressed air pipe (514), and the inner core (512) is fixed on the inner side of the nozzle (54); the flange mounting plate (57) is fixed on the side wall in the middle of the second oil pipe (58); the oil nozzle (59) is arranged on the side wall of the second oil pipe (58).

2. The multi-fuel regenerative burner according to claim 1, characterized in that: The left chamber of blast furnace gas is provided with three nozzles, which are parallel to each other, in the same direction, offset to the right, and the angle between the nozzle and the horizontal direction is 10-15°; the right chamber of blast furnace gas is provided with three nozzles, which are parallel to each other, in the same direction, offset to the left, and the angle between the nozzle and the horizontal direction is 10-15°.

3. The multi-fuel regenerative burner according to claim 1, characterized in that: A hanging plate (22) is arranged between the wall connecting plate (21) and the outer shell plate (25).

4. The multi-fuel regenerative burner according to claim 1, characterized in that: The center lines of the pipe sections of the first air pipeline (23) and the second air pipeline (24) are at an angle of 2-4° to the horizontal line.

5. The multi-fuel regenerative burner according to claim 1, characterized in that: A flange sealing plate and a sealing gasket (31) are provided between the edge of the shell (35) and the outer shell plate (25).

6. The multi-fuel regenerative burner according to claim 1, characterized in that The toothed disc (41) is provided with an air swirl port (411), a natural gas outlet (412) and an oil burner mounting hole (413); the air swirl port (411) is sawtooth-shaped, and the angle between the teeth and the axis of the toothed disc is 10-20°; there are two natural gas outlets (412), one is an inner hole sawtooth hole, the tooth-shaped hole is a gas outlet hole, and the other is a small hole that is equidistant and closely arranged, and the angle between the center of each hole and the axis of the toothed disc is 10-20°.

7. The multi-fuel regenerative burner according to claim 1, characterized in that: A first sealing gasket (53) is provided between the spray head (51) and the first oil pipe (55); a second sealing gasket (513) is provided between the nozzle (54) and the second compressed air pipe (514); and a third sealing gasket (516) is provided at the connection between the first oil pipe (55) and the second oil pipe (58).

8. The multi-fuel regenerative burner according to claim 1, characterized in that: The inner core (512) is provided with a plurality of air acceleration holes.

9. The multi-fuel regenerative burner according to claim 1, characterized in that: The fuel oil burner (5) further comprises a first positioning plate (56) and a second positioning plate (515), wherein the first positioning plate (56) is one or more and is arranged between the first oil pipe (55) and the natural gas pipe (43), and the second positioning plate (515) is one or more and is arranged between the second compressed air pipe (514) and the first oil pipe (55), and the first positioning plate (56) and the second positioning plate (515) have the function of increasing the rigidity of the steel pipe.

10. An industrial furnace, characterized in that: A multi-fuel regenerative burner according to any one of claims 1 to 9 is used.

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