Encircling type burner for ladle baking

Abstract

The utility model discloses a surrounding type burner for a baking ladle, which comprises a flue gas column, a baffle plate, a burner nozzle and the baking ladle, the baffle plate is in separable airtight connection with the opening side of the baking ladle, and the flue gas column and the burner nozzle are arranged on the baffle plate; 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 of the combustion chamber far away from the baking ladle is provided with 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, the mode that the multiple burners are distributed in a surrounding mode for heating is adopted, smoke waste heat is adopted for preheating combustion-supporting air for combustion supporting, good temperature uniformity is kept, meanwhile, the temperature rising speed is increased, and energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of combustion device, in particular to a kind of burner for around baking ladle. BACKGROUND

[0002] Baking ladle is necessary device for steel industry to be used for heat preservation and transport process of molten steel, and the depth and diameter of baking ladle can reach 4 meters, in the transport process from steelmaking to continuous casting, baking ladle is preheated to about 1000 DEG C by baking, if the temperature of baking ladle is too low, the initial temperature of molten steel needs to be increased to make up heat loss, thereby directly increasing smelting energy consumption.

[0003] In prior art, high furnace gas and other fuels are generally used to heat baking ladle by combustion gun, but the existing combustion gun generally uses open heating, and the flue gas after combustion is not fully utilized, which has problems of slow temperature rise, high energy consumption and the like, and in addition, due to the large inner cavity of baking ladle, temperature uniformity is poor, local high temperature leads to loss of heat insulation material, and affects service life of baking ladle.

[0004] Therefore, it is urgent to design a kind of burner for around baking ladle, which uses the heating mode of multiple burners distributed in a ring, and uses flue gas waste heat to preheat combustion air, to maintain good temperature uniformity, improve combustion temperature, improve thermal energy utilization efficiency and reduce energy consumption. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the technical scheme adopted by the utility model is as follows:

[0006] A kind of burner for around baking ladle, comprising baking ladle, characterized by further comprising flue gas column, baffle and burner, the baffle and the opening side of baking ladle are separable airtight connection, the flue gas column and burner are arranged on the baffle;

[0007] The flue gas column comprises flue gas column main body inserted into the inner cavity of baking ladle and coaxially arranged with the inner cavity of baking ladle, the flue gas column main body is a cylindrical structure, the center of flue gas column main body is provided with flue, the flue penetrates the baffle to make the inner cavity of baking ladle communicate with the outside;

[0008] The inner wall of flue gas column is provided with preheating air duct, the two ends of preheating air duct are communicated with air inlet pipe and hot gas pipe respectively, the air inlet pipe and hot gas pipe are arranged on the side of baffle away from baking ladle;

[0009] The burner comprises burner main body connected with baffle, the burner main body comprises combustion chamber and air duct;The end of combustion chamber away from baking ladle is provided with gas duct, the other end is flue gas port inserted into the inner cavity of baking ladle;The air duct is arranged on the outside of combustion chamber, one end of air duct faces the inner cavity of baking ladle, the other end is communicated with hot gas pipe;

[0010] The burner is arranged more than two, and the burners are arranged in the circumferential direction of the flue gas column and between the flue gas column and the side wall of the inner cavity of the ladle.

[0011] The depth of the flue gas column inserted into the inner cavity of the ladle is greater than the depth of the burner.

[0012] Preferably, the combustion chamber is further provided with a hydrogen-oxygen gas channel at one end close to the gas channel.

[0013] Preferably, the preheating gas channel is arranged more than two in the circumferential direction of the flue.

[0014] Preferably, the cross-sectional area of the flue gas outlet in the gas outlet direction is smaller than the cross-sectional area of the combustion chamber in the gas outlet direction.

[0015] Preferably, one end of the hydrogen-oxygen gas channel is connected with the air inlet pipe through the air inlet annular groove, and the other end is connected with the hot gas pipe through the hot gas annular groove.

[0016] Preferably, the gas channel is arranged more than two in the circumferential direction of the hydrogen-oxygen gas channel.

[0017] Preferably, the air channel is arranged more than two in the circumferential direction of the combustion chamber.

[0018] Preferably, the outlet of the air channel is lower than the outlet of the flue gas outlet, and the diffusion plate is arranged between the outlet of the air channel and the outlet of the flue gas outlet, so that the air flow of the air channel is gradually diffused away from the flue gas outlet.

[0019] Preferably, the diffusion plate is provided with a plurality of straight jet grooves, and the straight jet grooves make the air flow of the air channel consistent with the direction of the flue gas outlet.

[0020] Preferably, the cross section of the air channel is in a waist shape, and the cross-sectional area of the straight jet groove is less than half of the cross-sectional area of the air channel.

[0021] Preferably, the hydrogen-oxygen gas channel is connected with the electrolytic water hydrogen-oxygen mixed gas device.

[0022] Compared with the prior art, the beneficial effects of the present application are as follows:

[0023] 1. The combustion-supporting air is preheated by the flue gas waste heat, so that the combustion temperature is increased and the thermal energy utilization efficiency is improved.

[0024] 2. The hydrogen-oxygen gas flame is used to improve the thermal energy of the combustible gas, and then the combustible gas is combusted again, so that the combustion temperature of the combustible gas is increased, the heating time of the ladle is reduced, and the uniformity of the combustion temperature is improved.

[0025] 3, the flue gas column is inserted into the inner cavity of the baking ladle, the internal space is reduced, the efficient flue gas flow channel is constructed, the heat energy utilization efficiency is improved, and the baking ladle heating time is reduced;

[0026] 4, the diffusion plate and the direct injection groove are arranged between the flue gas port and the air duct, the combustion-supporting gas is guided to be layered and mixed with the combustible gas to form layered combustion, the uniformity of the combustion temperature is improved, local high temperature is avoided to cause the loss of the baking ladle heat insulation material, and the emission of nitrogen oxides is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the structure schematic diagram of the flue gas discharging direction of the utility model;

[0028] Figure 2 is Figure 1 A-A sectional view of

[0029] Figure 3 is the flue gas column structure schematic diagram (partially cut open);

[0030] Figure 4 is the whole and partial cut open schematic diagram of the burner.

[0031] Wherein: flue gas column 10, flue gas column main body 11, flue 12, preheating air 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 main body 31, hydrogen oxygen air duct 32, fuel gas duct 33, air duct 34, combustion chamber 35, diffusion plate 36, direct injection groove 37, flue gas port 38, baking ladle 40. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized 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 utility model more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "rear", and similar expressions used herein are for the purpose of illustration only.

[0034] 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 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.

[0035] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0036] like Figures 1-4 As shown, a surround-type 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 at their opening sides. The flue gas column 10 and the burner 30 are disposed on the baffle 20.

[0037] 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 20 to connect the inner cavity of the baking bag 40 with the outside.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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 0.25~0.5 meters, and the gap between the side wall of the smoke column 10 and the side wall of the baking bag 40 is 0.5~0.7 meters.

[0043] Six burners 30 are provided, and six preheating gas channels 13 are provided. In use, first, the hydrogen-oxygen gas channel 32 and the fuel gas channel 33 are respectively connected with an external hydrogen-oxygen mixed gas source (in this embodiment, the hydrogen-oxygen mixed gas is obtained by electrolysis of water) and a combustible gas source (in this embodiment, natural gas is used as the combustible gas, and in other embodiments, blast furnace gas containing methane can also be used), the gas inlet pipe 14 is connected with an external combustion-supporting air containing oxygen, and the air channel 34 is connected with the hot gas pipe 15.

[0044] The baffle 20 is connected in airtight manner with the open side of the baking ladle 40, the hydrogen-oxygen mixed gas is ignited in the combustion chamber 35 to heat the natural gas to a high temperature or even to crack the natural gas, the flue gas after combustion and the high-temperature natural gas or the product thereof are sprayed from the flue gas outlet 38, then the combustion-supporting air containing oxygen sprayed from the air channel 34 is secondarily combusted, the flue gas generated by the combustion flows along the gap between the baking ladle 40 and the sidewall of the flue gas column 10, and finally the flue gas is discharged from the flue 12 to heat the baking ladle 40 and the flue gas column 10 to about 1050 degrees Celsius.

[0045] In this embodiment, the combustion-supporting air is preheated in the preheating gas channel 13 and then participates in the combustion to increase the combustion temperature and improve the heat energy utilization rate.

[0046] Further, in order to improve the heat exchange efficiency of the flue gas waste heat in the flue 12, the preheating gas channels 13 are arranged in a circumferential distribution of two or more around the flue 12.

[0047] Further, in order to make the natural gas fully contact with the high-temperature flame of the hydrogen-oxygen gas, 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.

[0048] Further, in order to optimize the pipeline structure, one end of all the preheating gas channels 13 is respectively connected through the gas inlet annular groove 16 and then connected with the gas inlet pipe 14, and the other end is respectively connected through the hot gas annular groove 17 and then connected with the hot gas pipe 15.

[0049] Further, the hydrogen-oxygen gas has a fast combustion speed and a high temperature, and generally the flow rate of the hydrogen-oxygen gas is smaller than that of the natural gas, in order to make the natural gas fully contact with the high-temperature flame of the hydrogen-oxygen gas, the fuel gas channels 33 are arranged in a circumferential distribution of two or more around the hydrogen-oxygen gas channel 32.

[0050] Further, since the temperature of the hydrogen-oxygen gas superimposed with the high-temperature or cracked natural gas can be higher than 1800 degrees Celsius during combustion, direct contact of the excessively high temperature with the heat insulation material of the baking ladle can cause the heat insulation material to be consumed or the service life to be reduced, therefore, the combustion-supporting gas is used to surround the outside of the flue gas outlet 38 to avoid the excessively high temperature from causing the heat insulation material of the baking ladle to be consumed, and the air channels 34 are arranged in a circumferential distribution of two or more around the combustion chamber 35.

[0051] Further, the outlet of the air channel 34 is lower than the outlet of the smoke port 38, and a diffusion plate 36 is arranged between the outlet of the air channel 34 and the outlet of the smoke port 38, which makes the air flow of the air channel 34 gradually diffuse away from the smoke port 38.

[0052] The diffused combustion-supporting air gradually mixes with the combustible gas under the action of the high-temperature air flow reflected by the side wall of the baking ladle 40 and the smoke column 10 and the combustion, to form layered combustion.

[0053] Further, the diffusion plate 36 is provided with a plurality of straight jet grooves 37, which make the air flow of the air channel 34 consistent with the air flow direction of the smoke port 38.

[0054] Further, the cross section of the air channel 34 is in a waist-shaped structure, and the projection profile of the straight jet groove 37 is less than half of the profile area of the air channel 34.

[0055] In the embodiment, in order to avoid that the high-temperature combustible gas is rapidly combusted with the combustion-supporting gas, local high temperature is generated, the heat insulation material of the baking ladle is consumed, and thermal nitrogen oxides are generated. Through the combination of the diffusion plate 36 and the straight jet groove 37, the combustion-supporting air of the air channel 34 can be controlled and layered to contact the combustible gas, so that the layered combustion effect with uniform temperature is achieved, and the emission of nitrogen oxides is reduced.

[0056] Further, the hydrogen-oxygen gas channel 32 is connected with an electrolytic water hydrogen-oxygen mixed gas device.

[0057] With the maturity of green power and electrolytic water technology, the cost of the electrolytic water hydrogen-oxygen mixed gas is rapidly reduced, and the hydrogen-oxygen mixed gas obtained by electrolytic water is directly combusted in the embodiment, which has the following advantages:

[0058] 1. The process of separating hydrogen and oxygen during electrolytic water can be omitted, and the technical difficulty and cost are reduced;

[0059] 2. The hydrogen-oxygen gas obtained by electrolytic water is directly combusted, and the transportation cost and risk are saved;

[0060] 3. The proportion of hydrogen and oxygen does not need to be controlled, and water is completely generated after combustion. The thermal nitrogen oxides generated due to excessive oxygen or the incomplete combustion caused by insufficient oxygen is avoided.

[0061] For those skilled in the art, other various corresponding changes and deformations can be made according to the above-described technical solutions and concepts, and all these changes and deformations should belong to the protection scope of the claims of the utility model patent.

Claims

1. A burner for a ring oven, comprising a baking chamber (40), characterized in that: It also includes a flue gas column (10), a baffle (20) and a burner (30), the baffle (20) and the baking bag (40) opening side can be separated from the airtight connection, the flue gas column (10) and the burner (30) are arranged 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, the center of the flue gas column body (11) is provided with a flue (12), the flue (12) penetrates the baffle (20) to make the inner cavity of the baking bag (40) communicate with the outside; The inner wall of the flue gas column (10) is provided with a preheating air duct (13), the two ends of the preheating air duct (13) are respectively communicated with the air inlet pipe (14) and the hot gas pipe (15), the air inlet pipe (14) and the hot gas pipe (15) are arranged on the side of the baffle (20) away from the baking bag (40); The burner (30) includes a burner body (31) connected with 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 gas duct (33) at one end away from the baking bag (40), and the other end is a flue gas port (38) inserted into the inner cavity of the baking bag (40); the air duct (34) is arranged on the outside of the combustion chamber (35), one end of the air duct (34) faces the inner cavity of the baking bag (40), and the other end is communicated with the hot gas pipe (15); The burner (30) is provided with two or more than two, the burner (30) is arranged between the flue gas column (10) and the inner wall of the baking bag (40) cavity with the flue gas column (10) as the center and circumferentially distributed; The depth of the flue gas column (10) inserted into the inner cavity of the baking bag (40) is greater than the insertion depth of the burner (30).

2. A burner for a ring oven as claimed in claim 1, characterized in that: The combustion chamber (35) is further provided with a hydrogen-oxygen air duct (32) at one end close to the gas duct (33).

3. A burner for a ring oven as claimed in claim 1, characterized in that: The cross-sectional area of the flue gas port (38) in the gas outlet direction is smaller than that of the combustion chamber (35) in the gas outlet direction.

4. A burner for a ring oven as claimed in claim 1, characterized in that: One end of the preheating air duct (13) is connected with the air inlet pipe (14) through the air inlet annular groove (16); the other end is connected with the hot gas pipe (15) through the hot gas annular groove (17).

5. A burner for a ring oven as claimed in claim 2, characterized in that: The gas duct (33) is provided with two or more than two with the hydrogen-oxygen air duct (32) as the center and circumferentially distributed.

6. A burner for a ring oven as claimed in claim 1, characterized in that: The air duct (34) is provided with two or more than two with the combustion chamber (35) as the center and circumferentially distributed.

7. A burner for a ring oven as claimed in claim 1, characterized in that: The outlet of the air duct (34) is lower than that of the flue gas port (38), and a diffusion plate (36) is arranged between the outlet of the air duct (34) and the outlet of the flue gas port (38), the diffusion plate (36) makes the air flow of the air duct (34) gradually diffuse away from the flue gas port (38).

8. A burner for a ring oven as claimed in claim 7, characterized in that: The diffusion plate (36) is provided with a plurality of straight jet grooves (37), the straight jet grooves (37) make the air flow of the air duct (34) consistent with the direction of the flue gas port (38).

9. A burner for a ring oven as claimed in claim 8, characterized in that: The cross section of the air duct (34) is a waist-shaped structure, and the cross-sectional area of the straight jet groove (37) is less than half of the cross-sectional area of the air duct (34).

10. A burner for a ring oven as claimed in claim 2, characterized in that: The hydrogen-oxygen gas passage (32) is connected to the electrolytic water hydrogen-oxygen mixed gas device.

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