A secondary combustion type ladle burner

Abstract

The application discloses a secondary combustion type combustor for baking ladle, which comprises a flue gas column, a baffle, a burner and a baking ladle, the baffle and the baking ladle are connected in an air-tight manner at the opening side and can be separated, the flue gas column and the burner are arranged on the baffle; the flue gas column comprises a flue gas column main body which is inserted into the inner cavity of the baking ladle and coaxially arranged with the inner cavity of the baking ladle, a flue is arranged at the center of the flue gas column main body, the flue penetrates through the baffle to communicate the inner cavity of the baking ladle with the outside; a preheating air duct is arranged in the inner wall of the flue gas column; the burner comprises a burner main body which is connected with the baffle, the burner main body comprises a combustion chamber and an air duct; the combustion chamber is provided with a hydrogen-oxygen air duct and a gas duct at the end far from the baking ladle, and the other end is a flue gas port which is inserted into the inner cavity of the baking ladle; the air duct is arranged outside the combustion chamber, and one end of the air duct is communicated with a hot gas pipe. The combustor adopts the secondary combustion mode, can improve the combustion temperature while maintaining good temperature uniformity, can fully utilize the flue gas preheating, and can improve the temperature rising speed and reduce the energy consumption.

Description

Technical Field

[0001] This invention relates to the field of combustion devices, and in particular to a secondary combustion type burner for baking bread. Background Technology

[0002] The ladle is an essential device in the steel industry for processes such as heat preservation and transfer of molten steel. The ladle can be up to 4 meters deep and in diameter. During the transportation of molten steel from steelmaking to continuous casting, the ladle is preheated to about 1000°C by baking. If the ladle temperature is too low, the initial temperature of the molten steel needs to be increased to compensate for the heat loss, thereby directly increasing the smelting energy consumption.

[0003] In existing technologies, blast furnace gas and other fuels are typically used to heat the bread using a burner. However, existing burners generally use open heating, which does not fully utilize the flue gas after combustion, resulting in slow heating and high energy consumption. Moreover, due to the large internal cavity of the bread, there is poor temperature uniformity, and localized high temperatures lead to the wear and tear of the insulation material, affecting the service life of the bread.

[0004] Therefore, there is an urgent need to design a secondary combustion burner for baking bread, which can increase the combustion temperature while maintaining good temperature uniformity and make full use of flue gas preheating to improve 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 burner for baking bread includes a bread, characterized in that it further includes a flue gas column, a baffle and a burner, wherein the baffle is detachably and airtightly connected to the opening side of the bread, and the flue gas column and the burner are disposed on the baffle.

[0007] The flue gas column includes a main body of the flue gas column that is inserted into the inner cavity of the baking bag and is coaxially arranged with the inner cavity of the baking bag. The main body of the flue gas column has a cylindrical structure and a flue is provided in the center of the main body of the flue gas column. The flue passes through a baffle to connect the inner cavity of the baking bag with the outside.

[0008] The flue gas column has a preheating air duct inside its side wall. The two ends of the preheating air duct are connected to the air inlet pipe and the hot air pipe, respectively. The air inlet pipe and the hot air pipe are located on the side of the baffle away from the baking bag.

[0009] The burner includes a burner body connected to a baffle, the burner body includes a combustion chamber and an air duct; the combustion chamber is provided with a hydrogen-oxygen duct and a gas duct at one end away from the baking bag, and a flue gas port inserted into the inner cavity of the baking bag at the other end; the air duct is located outside the combustion chamber, with one end of the air duct facing the inner cavity of the baking bag and the other end connected to a hot gas pipe.

[0010] The burner is provided in two or more, and the burners are evenly distributed in a circle between the flue gas column and the inner wall of the baking bag, with the flue gas column as the center.

[0011] The depth to which the flue gas column is inserted into the inner cavity of the baking bag is greater than the depth to which the burner is inserted.

[0012] Preferably, there are two or more preheating air ducts arranged circumferentially around the flue.

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

[0014] Preferably, one end of each of the preheating air ducts is connected to the air inlet pipe via an air inlet annular groove; the other end is connected to the hot air pipe via a hot air annular groove.

[0015] Preferably, there are two or more gas combustion channels arranged circumferentially around the hydrogen-oxygen combustion channel.

[0016] Preferably, there are two or more air ducts arranged circumferentially around the combustion chamber.

[0017] Preferably, the outlet of the air duct is lower than the outlet of the flue gas outlet, and a diffuser plate is provided between the outlet of the air duct and the outlet of the flue gas outlet, the diffuser plate causing the airflow from the air duct to gradually diffuse away from the flue gas outlet.

[0018] Preferably, the diffuser plate is provided with a plurality of direct injection slots, which make the airflow from the air duct and the airflow from the flue gas outlet in the same direction.

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

[0020] Preferably, the hydrogen-oxygen channel is connected to the device for producing hydrogen-oxygen mixture by water electrolysis.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

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

[0023] 2. By using a hydrogen-oxygen flame to increase the thermal energy of the combustible gas, a secondary combustion is carried out, which increases the combustion temperature of the combustible gas, reduces the heating time of the bread, and improves the uniformity of the combustion temperature.

[0024] 3. Insert the flue gas column into the inner cavity of the baking bag to reduce the internal space, create an efficient flue gas flow channel, improve heat energy utilization efficiency, and reduce the baking time of the baking bag;

[0025] 4. Install a diffuser plate and a direct injection channel between the flue gas outlet and the air duct to guide the combustion-supporting gas to mix with the combustible gas in layers to form stratified combustion, improve the uniformity of combustion temperature, avoid local high temperature causing damage to the heat insulation material of the baking bag, and help reduce nitrogen oxide emissions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the flue gas discharge direction of the present invention;

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

[0028] Figure 3 This is a schematic diagram of the flue gas column structure (partial cross-section);

[0029] Figure 4 This is a schematic diagram of the burner as a whole and in parts.

[0030] The components include: flue gas column 10, flue gas column body 11, flue duct 12, preheating gas duct 13, air inlet pipe 14, hot gas pipe 15, air inlet annular groove 16, hot gas annular groove 17, baffle 20, burner 30, burner body 31, hydrogen-oxygen duct 32, gas combustion duct 33, air duct 34, combustion chamber 35, diffuser plate 36, direct injection groove 37, flue gas outlet 38, and baking sheet 40. Detailed Implementation

[0031] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," "front," "back," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The present invention will now be further described with reference to the accompanying drawings and specific embodiments:

[0035] like Figure 1-4 As shown, a secondary combustion burner for baking bread includes a flue gas column 10, a baffle 20, a burner 30, and a bread 40. The baffle 20 and the bread 40 are detachably and airtightly connected on the open side. The flue gas column 10 and the burner 30 are disposed on the baffle 10.

[0036] The flue gas column 10 includes a flue gas 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 flue gas column body 11 has a cylindrical structure. A flue 12 is arranged in the center of the flue gas column body 11. The flue 12 passes through the baffle 10 to connect the inner cavity of the baking bag 40 with the outside.

[0037] The flue gas column 10 has a preheating air duct 13 inside its side wall. The two ends of the preheating air duct 13 are connected to the air inlet pipe 14 and the hot air pipe 15, respectively. The air inlet pipe 14 and the hot air pipe 15 are located on the side of the baffle 20 away from the baking bag 40.

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

[0039] There are two or more burners 30, and the burners 30 are evenly distributed in a circle between the flue gas column 10 and the inner wall of the baking bag 40, with the flue gas column 10 as the center.

[0040] The depth to which the flue gas column 10 is inserted into the inner cavity of the baking bag 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 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 ducts 13. In use, the hydrogen-oxygen duct 32 and the gas duct 33 are first connected to an external hydrogen-oxygen mixture source (in this embodiment, hydrogen-oxygen mixture produced by water electrolysis is used as the gas source) and a combustible gas source (in this embodiment, natural gas is used as the combustible gas; in other embodiments, blast furnace gas containing methane can also be used). The air inlet pipe 14 is connected to an external combustion air containing oxygen, and the air duct 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. The hydrogen-oxygen mixture is ignited in the combustion chamber 35, which heats the natural gas to a high temperature or even causes it to crack. The flue gas and the high-temperature natural gas or its products are ejected from the flue gas port 38 and then undergo secondary combustion with the oxygen-containing combustion air ejected from the air duct 34. The flue gas produced by the combustion flows along the gap between the side walls of the baking bag 40 and the flue gas column 10. Finally, the flue gas is discharged from the flue 12, which heats the baking bag 40 and the flue gas column 10 to about 1050 degrees Celsius.

[0044] In this embodiment, the combustion air is preheated in the preheating duct 13 before participating in combustion, thereby increasing the combustion temperature and improving the thermal energy utilization rate.

[0045] Furthermore, in order to improve the heat exchange efficiency of the flue gas waste heat in the flue 12, the preheating gas duct 13 is arranged in two or more circumferentially around the flue 12.

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

[0047] Furthermore, in order to optimize the pipeline structure, one end of each of the preheating air ducts 13 is connected to the air inlet pipe 14 after being connected through the air inlet 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 burn quickly and at high temperatures. Typically, the flow rate of hydrogen and oxygen is less than that of natural gas. In order to ensure that the natural gas comes into full contact with the high-temperature flame of hydrogen and oxygen, the gas combustion channel 33 is arranged in two or more circumferentially around the hydrogen and oxygen channel 32.

[0049] Furthermore, since the temperature of hydrogen and oxygen combined with high temperature or even cracked natural gas can exceed 1800 degrees Celsius during combustion, the excessively high temperature directly contacting the insulation material of the baking bag will cause the insulation material to be damaged or its service life to be reduced. Therefore, combustion-supporting gas is used to surround the outside of the flue gas outlet 38 to avoid the insulation material of the baking bag being damaged by excessively high temperature. The air duct 34 is arranged in two or more evenly distributed around the combustion chamber 35.

[0050] Furthermore, the outlet of the air duct 34 is lower than the outlet of the flue gas outlet 38, and a diffuser plate 36 is provided between the outlet of the air duct 34 and the outlet of the flue gas outlet 38. The diffuser plate 36 causes the airflow from the air duct 34 to gradually diffuse away from the flue gas outlet 38.

[0051] The diffused combustion air, under the influence of reflection from the side walls of the baking bag 40 and the flue gas column 10, and the high-temperature airflow from combustion, gradually mixes with the combustible gas, forming stratified combustion.

[0052] Furthermore, the diffuser plate 36 is provided with a plurality of direct injection slots 37, which make the airflow from the air duct 34 and the airflow from the flue gas outlet 38 have the same direction.

[0053] Furthermore, the cross-section of the air duct 34 is waist-shaped, and the cross-sectional area of ​​the direct injection channel 37 is less than half the cross-sectional area of ​​the air duct 34.

[0054] In this embodiment, to avoid the rapid and concentrated combustion of high-temperature combustible gas and combustion-supporting gas, which would generate localized high temperatures and cause damage to the insulation material of the baking bag, as well as the generation of thermal nitrogen oxides due to high temperatures, the combination of diffuser plate 36 and direct injection channel 37 allows the combustion-supporting air in air channel 34 to contact the combustible gas in a controllable and stratified manner. This results in a uniformly heated stratified combustion effect and helps reduce nitrogen oxide emissions.

[0055] Furthermore, the hydrogen-oxygen channel 32 is connected to the device for producing hydrogen-oxygen mixture by water electrolysis.

[0056] With the maturity of green electricity and water electrolysis technology, the cost of producing hydrogen-oxygen mixtures by water electrolysis is rapidly decreasing. In this embodiment, the hydrogen-oxygen mixture produced by water electrolysis is directly combusted, which has the following advantages:

[0057] 1. The process of separating hydrogen and oxygen 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. No need to control the ratio of hydrogen and oxygen; combustion completely produces water. This avoids the formation 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 modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. A secondary combustion type burner for baking bread, comprising a bread (40), characterized in that: It also includes a flue gas column (10), a baffle (20) and a burner (30), wherein the baffle (20) and the opening side of the baking bag (40) are detachably airtightly connected, and the flue gas column (10) and the burner (30) are disposed on the baffle (20); The flue gas column (10) includes a flue gas 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 flue gas column body (11) is a cylindrical structure. A flue (12) is provided in the center of the flue gas column body (11). The flue (12) passes through the baffle (20) to connect the inner cavity of the baking bag (40) with the outside. The flue gas column (10) has a preheating air passage (13) inside its side wall. The two ends of the preheating air passage (13) are connected to the air inlet pipe (14) and the hot air pipe (15) respectively. The air inlet pipe (14) and the hot air pipe (15) are located on the side of the baffle (20) away from the baking bag (40). The burner (30) includes a burner body (31) connected to a baffle (20). The burner body (31) includes a combustion chamber (35) and an air duct (34). The combustion chamber (35) is provided with a hydrogen-oxygen duct (32) and a gas duct (33) at one end away from the baking bag (40), and a flue gas port (38) inserted into the inner cavity of the baking bag (40) at the other end. The air duct (34) is located outside the combustion chamber (35), with one end of the air duct (34) facing the inner cavity of the baking bag (40) and the other end connected to the hot gas pipe (15). There are two or more burners (30), and the burners (30) are evenly distributed in a circle between the flue gas column (10) and the inner wall of the baking bag (40) with the flue gas column (10) as the center. The depth to which the flue gas column (10) is inserted into the inner cavity of the baking bag (40) is greater than the insertion depth of the burner (30); The preheating air duct (13) is arranged in two or more circumferentially around the flue (12); One end of each of the preheating air passages (13) is connected to the air inlet pipe (14) via the air inlet annular groove (16); the other end is connected to the hot air pipe (15) via the hot air annular groove (17).

2. The secondary combustion type burner for baking bread as described in claim 1, characterized in that: The cross-sectional area of ​​the flue gas outlet (38) in the direction of gas discharge is smaller than the cross-sectional area of ​​the combustion chamber (35) in the direction of gas discharge.

3. The secondary combustion type burner for baking bread as described in claim 1, characterized in that: The gas passage (33) is arranged in two or more circumferentially around the hydrogen-oxygen passage (32).

4. The secondary combustion type burner for baking bread as described in claim 1, characterized in that: The air duct (34) is arranged in two or more circumferentially around the combustion chamber (35).

5. A secondary combustion type burner for baking bread as described in claim 1, characterized in that: The outlet of the air duct (34) is lower than the outlet of the flue gas outlet (38). A diffuser plate (36) is provided between the outlet of the air duct (34) and the outlet of the flue gas outlet (38). The diffuser plate (36) causes the airflow from the air duct (34) to gradually diffuse away from the flue gas outlet (38).

6. The secondary combustion type burner for baking bread as described in claim 5, characterized in that: The diffuser plate (36) is provided with a plurality of direct injection slots (37), which make the airflow from the air duct (34) and the airflow from the flue gas outlet (38) have the same direction.

7. A secondary combustion type burner for baking bread as described in claim 6, characterized in that: The cross-section of the air duct (34) is waist-shaped, and the cross-sectional area of ​​the direct injection channel (37) is less than half the cross-sectional area of ​​the air duct (34).

8. A secondary combustion type burner for baking bread as described in claim 1, characterized in that: The hydrogen-oxygen channel (32) is connected to the device for producing hydrogen-oxygen mixture by electrolysis of water.

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