Secondary combustion type burner for ladle baking

Abstract

The secondary combustion type burner for the baking ladle comprises a smoke column, a baffle, a burner nozzle and the baking ladle, the baffle is in separable airtight connection with the opening side of the baking ladle, and the smoke column and the burner nozzle are arranged on the baffle; the flue gas column comprises a flue gas column main body which is inserted into the baking ladle inner cavity and is coaxial with the baking ladle inner cavity, a flue is arranged in the center of the flue gas column main body, and the flue penetrates through the baffle to enable the baking ladle inner cavity to be communicated with the outside; a preheating gas channel is arranged in the side wall of the flue gas column; the burner comprises a burner body connected with the baffle, and the burner body comprises a combustion chamber and an air channel. One end, far away from the baking ladle, of the combustion chamber is provided with an oxyhydrogen channel and a gas channel, and the other end is a flue gas port inserted into an inner cavity of the baking ladle; the air channel is arranged outside the combustion chamber, and one end of the air channel communicates with the hot air pipe. According to the combustor, a secondary combustion mode is adopted, good temperature uniformity is kept while the combustion temperature is increased, smoke is fully utilized for preheating, the temperature rising speed is increased, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the field of combustion devices, in particular to a secondary combustion type burner for baking buns. Background Art

[0002] Baking ladle is a necessary device for the steel industry to keep molten steel warm and transfer. The depth and diameter of the baking ladle can reach 4 meters. During the transportation of molten steel from steelmaking to continuous casting, the ladle is preheated to about 1000℃ by baking. If the baking ladle temperature is too low, the initial temperature of the molten steel needs to be increased to compensate for the heat loss, which directly increases the smelting energy consumption.

[0003] In the prior art, a combustion gun is usually used to heat the baked buns using fuels such as blast furnace gas. However, the existing combustion guns generally use open heating, and the smoke after combustion is not fully utilized, resulting in problems such as slow heating and high energy consumption. In addition, since the inner cavity of the baked bun is large, the temperature uniformity is poor, and the local high temperature causes the loss of insulation materials, which affects the service life of the baked bun.

[0004] Therefore, it is urgent to design a secondary combustion type burner for baking buns, which uses secondary combustion to increase the combustion temperature while maintaining good temperature uniformity, and fully utilizes flue gas preheating to increase the heating rate and reduce energy consumption. Summary of the invention

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A secondary combustion type burner for buns, comprising buns, characterized in that it also comprises a smoke column, a baffle and a burner, wherein the baffle is detachably connected to an opening side of the bun in an airtight manner, and the smoke column and the burner are arranged on the baffle;

[0007] The smoke column comprises a smoke column body inserted into the inner cavity of the bun and coaxially arranged with the inner cavity of the bun, the smoke column body is a cylindrical structure, a smoke duct is arranged at the center of the smoke column body, and the smoke duct penetrates the baffle to connect the inner cavity of the bun with the outside;

[0008] A preheating air duct is arranged inside the side wall of the smoke column, and the two ends of the preheating air duct are respectively connected with an air inlet pipe and a hot air pipe, and the air inlet pipe and the hot air pipe are arranged on a side of the baffle away from the baked buns;

[0009] The burner comprises a burner body connected to the baffle, and the burner body comprises a combustion chamber and an air passage; one end of the combustion chamber away from the baking bag is provided with a hydrogen and oxygen passage and a fuel gas passage, and the other end is a smoke port inserted into the inner cavity of the baking bag; the air passage is arranged outside the combustion chamber, one end of the air passage faces the inner cavity of the baking bag, and the other end is connected to the hot air pipe;

[0010] There are more than two burners, which are evenly distributed around the smoke column and arranged between the smoke column and the side wall of the inner cavity of the baked bun.

[0011] The depth of the smoke column inserted into the inner cavity of the toasted bun is greater than the insertion depth of the burner.

[0012] Preferably, the preheating air duct is centered on the flue and is evenly distributed around the circumference, with more than two of them.

[0013] Preferably, the cross-sectional area of ​​the smoke outlet in the gas outlet direction is smaller than the cross-sectional area of ​​the smoke outlet in the gas outlet direction.

[0014] Preferably, one end of all the preheating air passages are connected to the air intake pipe after being connected through the air intake annular groove; the other end are connected to the hot air pipe after being connected through the hot air annular groove.

[0015] Preferably, the fuel gas passage is centered on the hydrogen and oxygen passage, and there are more than two of them evenly distributed around the circumference.

[0016] Preferably, the air passages are centered on the combustion chamber and are evenly distributed around the circumference, with more than two of them being arranged therein.

[0017] Preferably, the outlet of the air duct is lower than the outlet of the smoke outlet, and a diffusion plate is provided between the outlet of the air duct and the outlet of the smoke outlet, and the diffusion plate causes the outlet air flow of the air duct to gradually diffuse away from the smoke outlet.

[0018] Preferably, a plurality of direct spray slots are provided on the diffusion plate, and the direct spray slots make the outlet airflow of the air duct consistent with the outlet airflow of the smoke outlet.

[0019] Preferably, the cross-section of the air duct is a waist-shaped structure, and the cross-sectional area of ​​the direct spray slot is less than half of the cross-sectional area of ​​the air duct.

[0020] Preferably, the hydrogen and oxygen passage is connected to a device for producing hydrogen and oxygen mixed gas by electrolyzing water.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Using flue gas waste heat to preheat the combustion air before combustion can increase the combustion temperature and improve the efficiency of heat energy utilization;

[0023] 2. The flame of hydrogen and oxygen is used to increase the thermal energy of the combustible gas, and then secondary combustion is performed to increase the combustion temperature of the combustible gas, reduce the heating time of the baked buns, and improve the uniformity of the combustion temperature;

[0024] 3. Insert the smoke column into the inner cavity of the bun to reduce the internal space, build an efficient smoke flow channel, improve the efficiency of heat energy utilization, and reduce the heating time of the bun;

[0025] 4. A diffusion plate and a direct injection slot are set between the smoke outlet and the air duct to guide the combustion-supporting gas to be layered and mixed with the combustible gas to form layered combustion, thereby improving the uniformity of the combustion temperature, avoiding the loss of the baking insulation material caused by local high temperature, and helping to reduce the emission of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the smoke exhaust direction of the present invention;

[0027] Figure 2 yes Figure 1 AA section view;

[0028] Figure 3 It is a schematic diagram of the smoke column structure (partial cutaway);

[0029] Figure 4 It is a schematic diagram of the burner as a whole and a partial cutaway view.

[0030] Among them: smoke column 10, smoke column body 11, flue 12, preheating air duct 13, air inlet pipe 14, hot air pipe 15, air inlet annular groove 16, hot air annular groove 17, baffle 20, burner 30, burner body 31, hydrogen and oxygen duct 32, gas duct 33, air duct 34, combustion chamber 35, diffusion plate 36, direct injection groove 37, smoke outlet 38, baking bag 40. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments:

[0035] like Figure 1-4 As shown, a secondary combustion type burner for buns includes a smoke column 10, a baffle 20, a burner 30 and a bun 40, wherein the baffle 20 and the bun 40 are detachably connected to each other in an airtight manner at the opening sides thereof, and the smoke column 10 and the burner 30 are arranged on the baffle 10;

[0036] The smoke column 10 includes a smoke column body 11 inserted into the inner cavity of the baking bag 40 and coaxially arranged with the inner cavity of the baking bag 40. The smoke column body 11 is a cylindrical structure. A flue 12 is arranged at the center of the smoke column body 11. The flue 12 penetrates the baffle 10 to connect the inner cavity of the baking bag 40 with the outside.

[0037] A preheating air duct 13 is provided inside the side wall of the smoke column 10, and both ends of the preheating air duct 13 are respectively connected to an air inlet pipe 14 and a hot air pipe 15, and the air inlet pipe 14 and the hot air pipe 15 are provided on a side of the baffle 20 away from the toasted buns 40;

[0038] The burner 30 includes a burner body 31 connected to the baffle 20, and the burner body 31 includes a combustion chamber 35 and an air passage 34. The end of the combustion chamber 35 away from the baking bag 40 is provided with a hydrogen and oxygen passage 32 and a gas passage 33, and the other end is a smoke port 38 inserted into the inner cavity of the baking bag 40; the air passage 34 is arranged outside the combustion chamber 35, one end of the air passage 34 faces the inner cavity of the baking bag 40, and the other end is connected to the hot air pipe 15;

[0039] There are more than two burners 30, and the burners 30 are evenly distributed around the smoke column 10 and arranged between the smoke column 10 and the inner cavity side wall of the baking bun 40.

[0040] The depth of the smoke column 10 inserted into the inner cavity of the baking bun 40 is greater than the insertion depth of the burner 30 .

[0041] In this embodiment, the depth of the baking bag is 4 meters, the inner cavity diameter is 3 meters, the distance between the smoke column 10 and the bottom of the inner cavity of the baking bag 40 is 0.25 to 0.5 meters, and the gap between the side wall of the smoke column 10 and the side wall of the baking bag 40 is 0.5 to 0.7 meters.

[0042] There are six burners 30 and six preheating gas channels 13. When in use, firstly, the hydrogen and oxygen channels 32 and the fuel gas channels 33 are connected to the external hydrogen and oxygen mixed gas source (the hydrogen and oxygen mixed gas produced by electrolysis of water is used as the gas source in this embodiment) and the combustible gas source (the natural gas is used as the combustible gas in this embodiment, and blast furnace gas containing methane can also be used in other embodiments), the air inlet pipe 14 is connected to the external combustion-supporting air containing oxygen, and the air channel 34 is connected to the hot gas pipe 15.

[0043] The baffle 20 is airtightly connected to the open side of the baking bag 40, and the hydrogen-oxygen mixture is ignited in the combustion chamber 35 to heat the natural gas to a high temperature or even crack. The smoke and high-temperature natural gas or its products after combustion are ejected from the smoke port 38, and then secondary burned with the combustion air containing oxygen ejected from the air duct 34. The smoke generated by the combustion flows along the gap between the side walls of the baking bag 40 and the smoke column 10, and finally the smoke is discharged from the smoke duct 12, so that the baking bag 40 and the smoke column 10 are heated to about 1050 degrees Celsius.

[0044] The combustion-supporting air of this embodiment participates in combustion after being preheated in the preheating air passage 13, thereby increasing the combustion temperature and improving the utilization rate of thermal energy.

[0045] Furthermore, in order to improve the heat exchange efficiency of the flue gas waste heat in the flue 12, more than two preheating air ducts 13 are evenly distributed around the flue 12.

[0046] Furthermore, in order to allow the natural gas to fully contact the high temperature flame of hydrogen and oxygen and increase the pressure of the combustion chamber, the cross-sectional area of ​​the flue gas outlet 38 in the gas outlet direction is smaller than the cross-sectional area of ​​the combustion chamber 35 in the gas outlet direction.

[0047] Furthermore, in order to optimize the pipeline structure, one end of all the preheating air channels 13 are connected to the air intake pipe 14 after being connected through the air intake annular groove 16; the other end is connected to the hot air pipe 15 after being connected through the hot air annular groove 17.

[0048] Furthermore, hydrogen and oxygen have a fast combustion speed and high temperature. Usually, the flow rate of hydrogen and oxygen is smaller than that of natural gas. In order to allow the natural gas to fully contact the high-temperature flame of hydrogen and oxygen, the fuel gas channel 33 is centered on the hydrogen and oxygen channel 32 and is evenly distributed around the circumference.

[0049] Furthermore, since the temperature of hydrogen and oxygen combined with high temperature or even cracked natural gas can exceed 1800 degrees Celsius when burned, the excessively high temperature directly contacts the thermal insulation material of the toasting bag, causing the thermal insulation material to be damaged or reducing its service life. Therefore, a combustion-supporting gas is used to surround the outside of the smoke outlet 38 to prevent the thermal insulation material of the toasting bag from being damaged due to excessive temperature. The air duct 34 is centered on the combustion chamber 35, and there are more than two air ducts evenly distributed around the circumference.

[0050] Furthermore, the outlet of the air duct 34 is lower than the outlet of the smoke outlet 38 , and a diffusion plate 36 is provided between the outlet of the air duct 34 and the outlet of the smoke outlet 38 , and the diffusion plate 36 makes the outlet air flow of the air duct 34 gradually diffuse away from the smoke outlet 38 .

[0051] The diffused combustion-supporting air is gradually mixed with the combustible gas under the effect of reflection from the side walls of the baking bag 40 and the smoke column 10 and the high-temperature airflow of the combustion, thereby forming stratified combustion.

[0052] Furthermore, a plurality of direct injection slots 37 are provided on the diffusion plate 36 , and the direct injection slots 37 make the outlet airflow of the air passage 34 and the outlet airflow of the smoke outlet 38 consistent in direction.

[0053] Furthermore, the cross-section of the air passage 34 is in a waist-shaped structure, and the cross-sectional area of ​​the direct spray slot 37 is less than half of the cross-sectional area of ​​the air passage 34 .

[0054] In this embodiment, in order to avoid the high-temperature combustible gas and the combustion-supporting gas from rapidly and concentratedly burning, thereby generating local high temperature and causing the loss of the heat insulation material of the baking bag, and generating thermal nitrogen oxides due to the high temperature, the combination of the diffusion plate 36 and the direct injection slot 37 allows the combustion-supporting air in the air duct 34 to contact the combustible gas in a controllable and layered manner, thereby achieving a layered combustion effect with uniform temperature and helping to reduce the emission of nitrogen oxides.

[0055] Furthermore, the hydrogen and oxygen passage 32 is connected to a device for producing hydrogen and oxygen mixed gas by electrolyzing water.

[0056] With the maturity of green electricity and water electrolysis technology, the cost of producing hydrogen and oxygen mixed gas by water electrolysis has dropped rapidly. This embodiment uses water electrolysis to produce hydrogen and oxygen mixed gas and then directly burns it, which has the following advantages:

[0057] 1. The process of hydrogen and oxygen separation during water electrolysis can be omitted, reducing technical difficulty and cost;

[0058] 2. The produced hydrogen and oxygen are directly burned, saving transportation costs and risks;

[0059] 3. There is no need to control the ratio of hydrogen and oxygen, and water is completely generated after combustion. Avoid the generation of thermal nitrogen oxides due to excessive oxygen, or incomplete combustion due to insufficient oxygen.

[0060] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the patent claims of the present invention.

Claims

1. A secondary combustion type burner for baking buns, comprising a baking bun (40), characterized in that: It also comprises a smoke column (10), a baffle (20) and a burner (30), wherein the baffle (20) and the opening side of the baking bag (40) are detachably connected in an airtight manner, and the smoke column (10) and the burner (30) are arranged on the baffle (10); The smoke column (10) comprises a smoke column body (11) inserted into the inner cavity of the baking bag (40) and arranged coaxially with the inner cavity of the baking bag (40); the smoke column body (11) is a cylindrical structure; a smoke duct (12) is arranged at the center of the smoke column body (11); the smoke duct (12) penetrates the baffle (10) so that the inner cavity of the baking bag (40) is connected to the outside; A preheating air duct (13) is provided inside the side wall of the smoke column (10), and two ends of the preheating air duct (13) are respectively connected to an air intake pipe (14) and a hot air pipe (15), and the air intake pipe (14) and the hot air pipe (15) are arranged on a side of the baffle (20) away from the toasted buns (40); The burner (30) comprises a burner body (31) connected to the baffle (20), and the burner body (31) comprises a combustion chamber (35) and an air passage (34); one end of the combustion chamber (35) away from the baking bag (40) is provided with a hydrogen and oxygen passage (32) and a fuel gas passage (33), and the other end is a smoke port (38) inserted into the inner cavity of the baking bag (40); the air passage (34) is arranged outside the combustion chamber (35), one end of the air passage (34) faces the inner cavity of the baking bag (40), and the other end is communicated with the hot air pipe (15); There are more than two burners (30), and the burners (30) are evenly distributed around the smoke column (10) and arranged between the smoke column (10) and the inner cavity side wall of the toasted bun (40) with the smoke column (10) as the center. The depth of the smoke column (10) inserted into the inner cavity of the baking bun (40) is greater than the insertion depth of the burner (30).

2. A secondary combustion type bun baking burner as claimed in claim 1, characterized in that: The preheating air duct (13) is centered on the flue (12) and is evenly distributed around the circumference, with more than two of them being arranged.

3. A secondary combustion type bun baking burner as claimed in claim 1, characterized in that: The cross-sectional area of ​​the smoke outlet (38) in the gas outlet direction is smaller than the cross-sectional area of ​​the combustion chamber (35) in the gas outlet direction.

4. A secondary combustion type bun baking burner as claimed in claim 1, characterized in that: One end of all the preheating air passages (13) are connected to the air intake pipe (14) through the air intake annular groove (16); the other end are connected to the hot air pipe (15) through the hot air annular groove (17).

5. A secondary combustion type bun baking burner as claimed in claim 1, characterized in that: The fuel gas passage (33) is centered on the hydrogen and oxygen passage (32), and more than two of them are evenly distributed around the circumference.

6. A secondary combustion type bun baking burner as claimed in claim 1, characterized in that: The air passages (34) are centered on the combustion chamber (35) and are evenly distributed around the circumference, with more than two of them being provided.

7. A secondary combustion type bun baking burner as claimed in claim 1, characterized in that: The outlet of the air duct (34) is lower than the outlet of the smoke outlet (38), and a diffusion plate (36) is provided between the outlet of the air duct (34) and the outlet of the smoke outlet (38), and the diffusion plate (36) causes the outlet air flow of the air duct (34) to gradually diffuse away from the smoke outlet (38).

8. A secondary combustion type bun baking burner as claimed in claim 7, characterized in that: The diffusion plate (36) is provided with a plurality of direct spray slots (37), and the direct spray slots (37) make the outlet air flow of the air duct (34) and the outlet air flow of the smoke outlet (38) consistent in direction.

9. A secondary combustion type bun baking burner as claimed in claim 8, characterized in that: The cross section of the air passage (34) is in a waist-shaped structure, and the cross section area of ​​the direct spray slot (37) is less than half of the cross section area of ​​the air passage (34).

10. A secondary combustion type bun baking burner as claimed in claim 1, characterized in that: The hydrogen and oxygen passage (32) is connected to a device for producing hydrogen and oxygen mixed gas by electrolyzing water.

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