Gas flame swing burner and direct-fired heating device for denitration system

Abstract

The present invention is a gas flame swing burner and a direct-fired heating device for a denitration system, the gas flame swing burner comprises a burner body structure, a first swing drive structure and a second swing drive structure, the burner body structure comprises a stable combustion flue, a first swing blade structure and a second swing blade structure which are axially spaced in the stable combustion flue and can swing to change the flame injection angle, the first swing drive structure can drive the first swing blade structure to swing, and the second swing drive structure can drive the second swing blade structure to swing. The present invention can realize the function of dynamically adjusting the flame injection angle online in real time through the swinging of the first swing blade structure and the second swing blade structure, promote the process requirements of rapid heat exchange between the high-temperature combustion flue gas and the gas in the denitration flue, accurately control the temperature of the mixed flue gas, realize efficient flue gas denitration reaction, and realize ultra-low flue gas emissions.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas denitration, and in particular to a gas flame swing burner and a direct-fired heating device for a denitration system. Background Art

[0002] The control of air pollution is an important part of environmental governance. With the development of industry and the improvement of living standards, people are paying more and more attention to environmental issues and atmospheric environmental protection issues.

[0003] Nitrogen oxides (NOx) are a major type of atmospheric pollutant and one of the main factors in the formation of acid rain, photochemical smog and PM2.5 pollution. At present, industrial sources of NOx emissions in my country account for more than 70% of the total NOx emissions. The control emission technologies of NOx in industrial flue gas mainly include combustion control technology and post-combustion control technology. Combustion control technology includes low-nitrogen combustion technology, reburning technology and flue gas recirculation technology. Among the post-combustion control technologies, selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and SCR-SNCR hybrid technology are the main technologies. Considering economic and technical benefits, selective catalytic reduction is the most effective NOx post-control technology.

[0004] A large amount of SO is produced during coal combustion. 2 , NOx and other atmospheric pollutants, causing serious air pollution and economic losses. There are various pollutants in the flue gas emitted by thermal power, steel and other industries, which put forward strict requirements on the emission of NOx. The purpose of denitrification is mainly to remove nitric oxide (NO) and nitrogen dioxide (NO 2 ).

[0005] The proportion of nitric oxide (NO) in flue gas to nitrogen oxide (NOx) is very high, often above 90%. Nitric oxide is a polluting gas. When it is directly discharged into the atmosphere, it is easy to pollute the atmosphere, soil and water sources. Therefore, when factories discharge flue gas, especially when the flue gas contains nitric oxide, they need to denitrify the flue gas. Among them, the existing flue gas denitrification technologies are mainly dry and wet. Compared with the wet flue gas denitrification technology, the main advantages of dry flue gas denitrification technology are: low basic investment, simple equipment and process, high efficiency of removing NOx, no wastewater and waste treatment, and not easy to cause secondary pollution.

[0006] The SCR reaction requires the use of a catalyst. Currently, the most widely used is a medium-temperature catalyst with an operating temperature of 320-450°C. Therefore, the reaction temperature of catalytic reduction denitrification should be controlled at 320-450°C. When the reaction temperature is lower than 300°C, a side reaction will occur on the catalyst surface, and ammonia will react with sulfur trioxide and water to generate (NH 4 ) 2 SO4 or NH 4 SO 4 Reduce the reaction with NOx, the product adheres to the catalyst surface, blocks the catalyst channels and micropores, and reduces the catalyst activity. In addition, if the reaction temperature is higher than the applicable temperature of the catalyst, the catalyst channels and micropores will be deformed, thereby deactivating the catalyst. Therefore, ensuring the appropriate reaction temperature is the key to the normal operation of the selective catalyst reduction method. Low boiler load or low atmospheric temperature will cause the SCR inlet temperature to be lower than the catalyst operating temperature. Among them, SCR denitrification requires a temperature window of 300-400℃. NOx is in the catalyst and NH 3 is reduced to N 2 , the denitrification efficiency can reach more than 90%.

[0007] In the denitrification process, the flue gas needs to be heated to a preset temperature before the denitrification process can be carried out efficiently and stably. In the prior art, the flue gas heating is often achieved by setting a heating source below the denitrification flue and allowing the high-temperature gas to rise and mix evenly with the flue gas to achieve the heating purpose. However, since the denitrification system pipelines are generally long in size, heat loss is inevitably caused during the rising process of the high-temperature gas below the mixing layer. At the same time, during the rising process of the high-temperature gas, the axial mixing length with the flue gas is long enough, but the radial mixing surface cannot be guaranteed to be large enough, so the complete and uniform mixing of the high-temperature gas and the flue gas cannot be guaranteed.

[0008] In the steel, metallurgy and coal chemical industries, the exhaust gas temperature of sintering machines and other equipment is relatively low. In order to meet the subsequent denitrification treatment or other process requirements in the SCR equipment, the exhaust gas needs to be heated. There are many ways to heat the flue gas, such as directly adding a heat exchanger, setting up electric heating, etc., which use high-temperature heat sources for heating. These methods require additional heat sources, resulting in high operating costs.

[0009] In addition, since a large amount of blast furnace gas, converter gas, coke oven gas and other fuel gases are usually generated in industrial equipment in the steel, metallurgy and coal chemical industries. Therefore, in the prior art, many companies will use these fuel gases to set up a separate heating furnace outside the flue, and set up one or more blast furnace gas or coke oven gas burners according to the power of the heating furnace. The fuel gas in the burner is burned to produce high-temperature flue gas, and the high-temperature flue gas is sent into the flue through a branch and mixed with the original flue gas in the flue to achieve heating of the original flue gas. Since the above method needs to set up a separate heating furnace outside the flue, on the one hand, the investment cost is relatively high, and on the other hand, after the high-temperature flue gas after the combustion of the fuel gas is mixed with the original flue gas in the flue, the total amount of flue gas in the flue will increase sharply, thereby causing a greater impact on the flue system, and also causing the problem of insufficient output of the existing induced draft fan.

[0010] At present, the environmental protection situation in the steel industry is becoming increasingly severe, and steel companies need to carry out ultra-low emission transformation in steps. The most commonly used technology in steel plants that have implemented low-emission transformation is to build a set of SCR denitrification equipment, and then use the steel plant's own blast furnace gas to heat the flue gas, so as to meet the denitrification inlet flue gas temperature requirements.

[0011] Blast furnace gas is not easy to ignite due to its low calorific value. Generally, an insulated ignition duct with a separate castable is used. Natural gas or light oil gun is used for ignition first. After the temperature in the ignition duct is raised, blast furnace gas is introduced for combustion. Finally, the high-temperature flue gas after combustion is mixed into the denitrification flue to heat the denitrification flue gas. Although blast furnace gas has a low calorific value, it burns in an insulated flue, and the high-temperature flue gas it produces can reach a temperature of 1200-1400°C. During the ignition process, if natural gas or an oil gun is used for ignition, the combustion temperature will be even higher, reaching 1500-1700°C, while the operating temperature of ordinary refractory castables is around 1300°C, which can easily cause the ignition air duct castable to fall off, and then the air duct steel plate will be deformed by high temperature and its life will be shortened; if refractory castables with better performance, such as alumina hollow ball castables, are used, the manufacturing cost will be greatly increased due to their high price; in addition, there is also the prior art that uses a large excess air coefficient to reduce the combustion flue gas temperature, but this method will greatly increase the additional air required for heating, thereby requiring more gas, resulting in poor economic efficiency.

[0012] The flue gas from the sintering machine of the steel plant needs to be denitrated. Traditional denitrification projects heat the flue gas through a heating furnace. The latest technology is to heat the flue gas directly in the flue, which not only saves the amount of flue gas, but also greatly saves engineering costs and plant land. Flue direct-fired burners also have certain technical difficulties:

[0013] 1. The negative pressure in the flue is large, and the burner is not easy to burn stably;

[0014] 2. The flue gas directly in contact with the flame has a higher temperature rise, while the flue gas far from the flame has a lower temperature rise, so the flue gas temperature is uneven;

[0015] 3. The scouring of the flame by the smoke can easily cause the flame to go out;

[0016] 4. The ignition point of combustible gas is high, the inert gas content is high, and it is not easy to burn stably;

[0017] 5. Loud noise is generated when air is taken in.

[0018] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a gas flame swing burner and a direct-fired heating device for a denitrification system to overcome the defects of the prior art. Summary of the invention

[0019] The purpose of the present invention is to provide a gas flame swinging burner and a direct-fired heating device for a denitrification system. The present invention can realize the function of dynamically adjusting the flame injection angle online in real time through the swinging of the first swinging blade structure and the second swinging blade structure, promote the process requirements of rapid heat exchange between the high-temperature burning flue gas and the gas in the denitrification flue, accurately control the temperature of the mixed flue gas, realize efficient flue gas denitrification reaction, and achieve ultra-low flue gas emissions.

[0020] The objective of the present invention is achieved in this way. A gas flame swing burner comprises a burner body structure, a first swing drive structure and a second swing drive structure. The burner body structure comprises a combustion stabilizing flue, a first swing blade structure and a second swing blade structure which are axially spaced in the combustion stabilizing flue and can swing to change the flame injection angle. The first swing drive structure can drive the first swing blade structure to swing, and the second swing drive structure can drive the second swing blade structure to swing.

[0021] In a preferred embodiment of the present invention, the first swinging blade structure includes a plurality of first blades spaced in parallel and capable of swinging synchronously, each first blade is provided with a first rotation center axis along its length direction, and the first swinging driving structure can drive each first blade to swing around its first rotation center axis; the second swinging blade structure includes a plurality of second blades spaced in parallel and capable of swinging synchronously, each second blade is provided with a second rotation center axis along its length direction, and the second swinging driving structure can drive each second blade to swing around its second rotation center axis; the first rotation center axis and the second rotation center axis are arranged at a first angle.

[0022] In a preferred embodiment of the present invention, a first blade is set as a first active blade, and the other first blades are set as first driven blades, the first swinging blade structure includes a first active shaft and a first driven shaft, the first active shaft is connected to the first end of the first active blade, the first driven shaft is connected to the second end of the first active blade, the first swinging drive structure can drive the first active shaft to drive the first active blade to rotate; the first active shaft and the first driven shaft are both coaxially arranged with the first rotation center axis; the first end and the second end of each first driven blade are respectively hinged to the side wall of the stable combustion flue through the first connecting shaft; each first connecting shaft is arranged parallel to the first rotation center axis; the first active blade is connected to each first driven blade through a first fastening assembly.

[0023] In a preferred embodiment of the present invention, the first swing driving structure includes a first fixed base, a first telescopic cylinder and a first swing connecting rod, the first end of the first fixed base is fixedly connected to the stable combustion flue, the second end of the first fixed base is rotatably connected to the first end of the first telescopic cylinder, the second end of the first telescopic cylinder is hinged to the first end of the first swing connecting rod, the second end of the first swing connecting rod is connected to the first active rotating shaft, and the first swing connecting rod is used to drive the first active rotating shaft to rotate around its central axis.

[0024] In a preferred embodiment of the present invention, a second blade is set as a second active blade, and the other second blades are set as second driven blades, the second swinging blade structure includes a second active shaft and a second driven shaft, the second active shaft is connected to the first end of the second active blade, the second driven shaft is connected to the second end of the second active blade, the second swinging drive structure can drive the second active shaft to drive the second active blade to rotate; the second active shaft and the second driven shaft are both coaxially arranged with the second rotation center axis; the first end and the second end of each second driven blade are respectively hinged to the side wall of the stable combustion flue through a second connecting shaft; each second connecting shaft is arranged parallel to the second rotation center axis; the second active blade is connected to each second driven blade through a second fastening assembly.

[0025] In a preferred embodiment of the present invention, the second swing driving structure includes a second fixed base, a second telescopic cylinder and a second swing connecting rod, the first end of the second fixed base is fixedly connected to the stable combustion flue, the second end of the second fixed base is rotatably connected to the first end of the second telescopic cylinder, the second end of the second telescopic cylinder is hinged to the first end of the second swing connecting rod, the second end of the second swing connecting rod is connected to the second active rotating shaft, and the second swing connecting rod is used to drive the second active rotating shaft to rotate around its central axis.

[0026] In a preferred embodiment of the present invention, a first protective shell is buckled on the outer side of the first swing driving structure, and a second protective shell is buckled on the outer side of the second swing driving structure.

[0027] In a preferred embodiment of the present invention, each of the first blades is vertically arranged, and each of the second blades is horizontally arranged.

[0028] In a preferred embodiment of the present invention, the spacing between the first swing blade structure and the second swing blade structure along the axial direction of the stable combustion flue is 15 to 45 mm; the spacing between adjacent first blades is 50 to 250 mm, and the spacing between adjacent second blades is 50 to 250 mm.

[0029] In a preferred embodiment of the present invention, the inner cavity of the combustion stabilizing flue is connected to form a combustion mixing chamber, the first swing blade structure and the second swing blade structure are arranged at the first end of the combustion mixing chamber, the second end of the combustion mixing chamber is connected to set a combustion-supporting combustion chamber and a gas chamber, the gas chamber and the combustion-supporting combustion chamber are penetrated by an ejector, the ejector is coaxially arranged with the combustion mixing chamber, the ejector is used to accelerate the combustible gas in the gas chamber to be sprayed into the combustion mixing chamber, a necked ejection channel is formed between the combustion-supporting combustion chamber and the combustion mixing chamber, the combustion-supporting combustion in the combustion-supporting combustion chamber is ejected into the combustion mixing chamber through the ejection channel; an igniter, a flame detector and a temperature detector are arranged in the combustion mixing chamber.

[0030] In a preferred embodiment of the present invention, a first flange is sleeved on the side wall of the stable combustion flue, and the first flange is used for sealing connection with the side wall of the denitrification flue.

[0031] The object of the present invention can also be achieved in this way. A direct-fired heating device for a denitrification system includes a plurality of the aforementioned gas flame swinging burners, and the plurality of gas flame swinging burners constitute a burner group. The center line of the flame flow of each gas flame swinging burner in the burner group is tangent to an imaginary tangent circle, and the first swinging blade structure and the second swinging blade structure of each gas flame swinging burner can swing to adjust the flame injection angle.

[0032] As described above, the gas flame swing burner and the direct-fired heating device for the denitration system provided by the present invention have the following beneficial effects:

[0033] In the gas flame swing burner provided by the present invention, the first swing driving structure can drive the first swing blade structure to swing, and the second swing driving structure can drive the second swing blade structure to swing, and the two can swing independently or simultaneously, so as to realize the function of dynamically adjusting the flame injection angle online in real time, meet the requirements of dynamic heating of different areas, realize the dynamic adjustment of the size and intensity of the flame combustion area, meet the function of dynamically adjusting the size and position of the flame combustion area in the denitrification flue, promote the process requirements of rapid heat exchange between the high-temperature burning flue gas and the gas in the denitrification flue, accurately control the temperature of the mixed flue gas, realize efficient flue gas denitrification reaction, and realize ultra-low emission of flue gas; a burner of natural gas, blast furnace gas or other combustible gas is arranged in the flue to directly heat the flue gas, which can cause the flue gas temperature to reach the temperature range of the ideal denitrification reaction of the catalyst, meet the ultra-low emission requirements, and improve the economic benefits of equipment operation; the ejector jet technology is adopted to reduce the load of the system fan, reduce the resistance loss of the flue, and improve the stability of equipment operation;

[0034] In the direct-fired heating device for the denitration system of the present invention, a plurality of gas flame swing burners are arranged in groups in the denitration flue, and the flame combustion heat of the gas flame swing burners is used to directly heat the flue gas, thereby improving the heat utilization efficiency and reducing the heat loss; the plurality of gas flame swing burners in the denitration flue are grouped, and the kinetic energy of the flame jet of the gas flame swing burner is used to prompt the flue gas to form a swirl zone, thereby realizing the dynamic swirl effect of the flue gas, promoting the turbulent flow of the flue gas, promoting the heat exchange between the flue gas and the high-temperature flame, shortening the length of the heat exchange zone in the flue, and realizing the temperature uniformity; the flame jet direction of the gas flame swing burner is consistent with the direction of the flue gas flow The two blades are arranged opposite to each other, which promotes rapid and efficient heat exchange between the flue gas and the high-temperature flame, shortens the time required for heat exchange, reduces the flue length required for uniform flue gas temperature, and promotes uniform temperature in the flue; the first swing blade structure and the second swing blade structure in each gas flame swing burner can swing to adjust the flame injection angle to meet the requirements of dynamic heating in different areas and realize dynamic adjustment of the size and intensity of the swirl area; the direct-fired heating device for the denitrification system of the present invention directly heats the flue gas, causes the flue gas temperature to reach the temperature range of the ideal denitrification reaction of the catalyst, realizes the expected denitrification reaction, meets the ultra-low emission requirements, and improves the economic benefits of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0036] Figure 1 : It is the structural diagram of the gas flame swing burner of the present invention.

[0037] Figure 2 :for Figure 1 Middle AA section view.

[0038] Figure 3 : A top view of the first swing drive structure of the present invention.

[0039] Figure 4 : It is the front view of the first swing driving structure of the present invention.

[0040] Figure 5 : It is a side view of the gas flame swing burner when the cross section of the stable combustion flue of the present invention is square.

[0041] Figure 6 : is a side view of a gas flame swing burner when the cross section of the stable combustion flue of the present invention is circular.

[0042] Figure 7 : It is a side view of the first swing blade structure when the cross-section of the stable combustion flue of the present invention is circular.

[0043] Figure 8: It is a side view of the second swing blade structure when the cross-section of the stable combustion flue of the present invention is circular.

[0044] Fig. 9 : It is a schematic diagram of the connection between the gas flame swing burner and the denitrification flue of the present invention.

[0045] Fig.10 : is a schematic diagram of a direct-fired heating device for a denitration system according to the present invention.

[0046] In the figure:

[0047] 100. Gas flame swing burner;

[0048] 200. Direct-fired heating device for denitration system; 201. Imaginary tangential circle;

[0049] 1. First swing drive structure; 11. First fixed base; 12. First telescopic cylinder; 121. First cylinder body; 122. First cylinder rod; 13. First swing connecting rod; 14. First fixed connecting rod; 15. First pin shaft;

[0050] 2. A second swing driving structure;

[0051] 3. The first swing blade structure;

[0052] 31. first blade; 32. first driving shaft; 33. first driven shaft; 34. first connecting shaft; 35. first fastening assembly; 36. blade connecting bolt; 37. first shaft sleeve;

[0053] 4. Second swing blade structure;

[0054] 41. Second leaf;

[0055] 5. Stable combustion flue;

[0056] 51. Combustion chamber; 52. Combustion-supporting chamber; 53. Ejector; 531. Straight pipe section; 532. Contraction section; 533. Throat section; 534. Expansion section; 535. Rectification section; 54. Ejector channel; 55. Igniter; 56. Flame detector; 57. Temperature detector; 58. First flange;

[0057] 61. a first protective shell; 62. a second protective shell;

[0058] 9. Denitrification flue; 91. Front side wall; 92. Rear side wall. DETAILED DESCRIPTION

[0059] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0060] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0062] Figures 1 to 10 As shown, the present invention provides a gas flame swing burner 100, including a burner body structure, a first swing drive structure 1 and a second swing drive structure 2, the burner body structure includes a stable combustion flue 5, a first swing blade structure 3 and a second swing blade structure 4 which are axially spaced in the stable combustion flue 5 and can swing to change the flame injection angle, the first swing drive structure 1 can drive the first swing blade structure 3 to swing, and the second swing drive structure 2 can drive the second swing blade structure 4 to swing.

[0063] In the gas flame swing burner provided by the present invention, the first swing driving structure can drive the first swing blade structure to swing, and the second swing driving structure can drive the second swing blade structure to swing, and the two can swing independently or simultaneously, so as to realize the function of dynamically adjusting the flame injection angle online in real time, meet the requirements of dynamic heating of different areas, realize the dynamic adjustment of the size and intensity of the flame combustion area, meet the function of dynamically adjusting the size and position of the flame combustion area in the denitrification flue, promote the process requirements of rapid heat exchange between the high-temperature burning flue gas and the gas in the denitrification flue, accurately control the temperature of the mixed flue gas, realize efficient flue gas denitrification reaction, and realize ultra-low emission of flue gas; a burner of natural gas, blast furnace gas or other combustible gas is set in the flue to directly heat the flue gas, which can prompt the flue gas temperature to reach the temperature range of the ideal denitrification reaction of the catalyst, meet the ultra-low emission requirements, and improve the economic benefits of equipment operation.

[0064] Further, if Figure 1 , Figure 2 As shown, the first swing blade structure 3 includes a plurality of first blades 31 spaced in parallel and capable of swinging synchronously, each first blade 31 is provided with a first rotation center axis along its length direction, and the first swing driving structure 1 can drive each first blade 31 to swing around its first rotation center axis, and the swing angle range of the first blade 31 is ±30°; the second swing blade structure 4 includes a plurality of second blades 41 spaced in parallel and capable of swinging synchronously, each second blade 41 is provided with a second rotation center axis along its length direction, and the second swing driving structure 2 can drive each second blade 41 to swing around its second rotation center axis, and the swing angle range of the second blade 41 is ±30°; the first rotation center axis and the second rotation center axis are arranged at a first angle. In this embodiment, the first angle is 90°, the first rotation center axis is arranged vertically, and the second rotation center axis is arranged horizontally.

[0065] Further, if Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, a first blade is set as a first active blade, and other first blades are set as first driven blades. The first swinging blade structure 3 includes a first active shaft 32 and a first driven shaft 33. The first active shaft 32 is connected to the first end of the first active blade, and the first driven shaft 33 is connected to the second end of the first active blade. The first swinging drive structure 1 can drive the first active shaft 32 to drive the first active blade to rotate; the first active shaft 32 and the first driven shaft 33 are both coaxially arranged with the first rotation center axis. In this embodiment, the first rotation center axis is located on the width center line of the first blade; the first end and the second end of each first driven blade are respectively hinged to the side wall of the stable combustion flue 5 through the first connecting shaft 34; each first connecting shaft 34 is arranged parallel to the first rotation center axis; the first active blade is connected to each first driven blade through the first fastening assembly 35, and the first active blade drives each first driven blade to swing through the first fastening assembly 35, so that all first blades 31 swing synchronously at the same time.

[0066] One end of each first blade 31 is hinged to the first fastening assembly 35 through a blade connecting bolt 36 , and the movement trajectory of the first fastening assembly 35 is radial translation along the stable combustion flue 5 .

[0067] Further, if Figure 3 , Figure 4 As shown, the first swing driving structure 1 includes a first fixed base 11, a first telescopic cylinder 12 and a first swing connecting rod 13. The first end of the first fixed base 11 is fixedly connected to the combustion stabilizing flue 5. The second end of the first fixed base 11 is rotatably connected to the first end of the first telescopic cylinder 12. The second end of the first telescopic cylinder 12 is hinged to the first end of the first swing connecting rod 13. The second end of the first swing connecting rod 13 is connected to the first active rotating shaft 32. The first swing connecting rod 13 is used to drive the first active rotating shaft 32 to rotate around its central axis. The first rotating shaft sleeve 37 is sleeved on the first active rotating shaft 32. The first rotating shaft sleeve 37 is fixedly connected to the combustion stabilizing flue 5. The first active rotating shaft 32 is axially fixed and can rotate circumferentially through the first rotating shaft sleeve 37.

[0068] like Figure 3 , Figure 4As shown, in this embodiment, the second end of the first fixed base 11 is connected to the first end of the first fixed connecting rod 14, the first telescopic cylinder 12 includes a first cylinder body 121 and a first cylinder rod 122, the first end of the first cylinder body 121 is hinged to the second end of the first fixed connecting rod 14 through a first pin shaft 15, the center line of the first pin shaft 15 is vertically arranged, the first cylinder body 121 and the first cylinder rod 122 can rotate around the first pin shaft 15 in a horizontal plane; the first end of the first cylinder rod 122 is sealed and slidably penetrated from the second end of the first cylinder body 121 to the first cylinder body 12 1, the second end of the first cylinder rod 122 is hinged to the first swing link 13, the first pin 15, the connecting axis of the first cylinder rod 122 and the first swing link 13, and the first active rotating shaft 32 are arranged in parallel; the first cylinder body 121 is connected to the liquid or gas supply device through a pipeline, and the supply device is used to increase or decrease the volume of the gas or liquid in the first cylinder body 121 to drive the first cylinder rod 122 to perform a telescopic action, and the telescopic action of the first cylinder rod 122 drives the first swing link 13 and the first active rotating shaft 32 to rotate and swing around the first active rotating shaft 32.

[0069] Further, if Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 As shown, a second blade is set as a second active blade, and the other second blades are set as second driven blades. The second swinging blade structure 4 includes a second active shaft and a second driven shaft. The second active shaft is connected to the first end of the second active blade, and the second driven shaft is connected to the second end of the second active blade. The second swinging drive structure can drive the second active shaft to drive the second active blade to rotate; the second active shaft and the second driven shaft are both coaxially arranged with the second rotation center axis. In this embodiment, the second rotation center axis is located on the width center line of the second blade; the first end and the second end of each second driven blade are respectively hinged to the side wall of the stable combustion flue through a second connecting shaft; each second connecting shaft is arranged parallel to the second rotation center axis; the second active blade is connected to each second driven blade through a second fastening assembly.

[0070] Furthermore, the second swing driving structure 2 includes a second fixed base, a second telescopic cylinder and a second swing connecting rod. The first end of the second fixed base is fixedly connected to the combustion stabilizing flue, the second end of the second fixed base is rotatably connected to the first end of the second telescopic cylinder, the second end of the second telescopic cylinder is hinged to the first end of the second swing connecting rod, the second end of the second swing connecting rod is connected to the second active rotating shaft, and the second swing connecting rod is used to drive the second active rotating shaft to rotate around its central axis. A second rotating shaft jacket is sleeved on the second active rotating shaft, the second rotating shaft jacket is fixedly connected to the combustion stabilizing flue 5, and the second active rotating shaft is axially fixed and can pass through the second rotating shaft jacket in a circumferentially rotatable manner.

[0071] In this embodiment, the second end of the second fixed base is connected to the first end of the second fixed connecting rod, and the second telescopic cylinder includes a second cylinder body and a second cylinder rod. The first end of the second cylinder body is hinged to the second end of the second fixed connecting rod through a second pin shaft, and the center line of the second pin shaft is horizontally arranged, and the second cylinder body and the second cylinder rod can rotate in a vertical plane around the second pin shaft; the first end of the second cylinder rod is sealed and slidably penetrated into the second cylinder body from the second end of the second cylinder body, and the second end of the second cylinder rod is hinged to the second swing connecting rod, and the second pin shaft, the connecting axis of the second cylinder rod and the second swing connecting rod and the second active rotating shaft are arranged in parallel; the second cylinder body is connected to the liquid or gas supply device through a pipeline, and the supply device is used to increase or decrease the volume of the gas or liquid in the second cylinder body to drive the second cylinder rod to perform a telescopic action, and the telescopic movement of the second cylinder rod drives the second swing connecting rod and the second active rotating shaft to rotate and swing around the second active rotating shaft as the center.

[0072] Further, if Fig. 9 As shown, a first protective shell 61 is buckled on the outer side of the first swing drive structure 1, and a second protective shell 62 is buckled on the outer side of the second swing drive structure 2. The first protective shell 61 and the second protective shell 62 are arranged in the denitrification flue, and are used to protect the first swing drive structure 1 and the second swing drive structure 2 located in the denitrification flue, respectively. The first protective shell 61 is provided with a heat insulating material to ensure that the working temperature of the first swing drive structure 1 is lower than 100°C; the second protective shell 62 is provided with a heat insulating material to ensure that the working temperature of the second swing drive structure 2 is lower than 100°C.

[0073] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, in this embodiment, each first blade 31 is vertically arranged, and each second blade 41 is horizontally arranged.

[0074] In a specific embodiment of the present invention, the spacing a between the first swing blade structure 3 and the second swing blade structure 4 along the axial direction of the stable combustion flue is 15 to 45 mm, preferably in the range of 20 to 30 mm; the spacing d between adjacent first blades 31 is 50 to 250 mm, preferably in the range of 100 to 200 mm; the spacing f between adjacent second blades 41 is 50 to 250 mm, preferably in the range of 100 to 200 mm. When the cross-section of the stable combustion flue 5 is rectangular (or square), the length of the first blade 31 or the second blade 41 is L, and the range of L is limited to 250 to 450 mm, preferably in the range of 300 to 400 mm, and the ratio of L to d or f is in the range of 2 to 4, preferably in the range of 2.5 to 3.5.

[0075] Further, if Figure 1 , Figure 2As shown, the inner cavity of the combustion stabilizing flue 5 is connected to form a combustion mixing chamber, the first swing blade structure 3 and the second swing blade structure 4 are arranged at the first end of the combustion mixing chamber, and the second end of the combustion mixing chamber is connected to set the combustion-supporting chamber 52 and the gas chamber 51, and the gas chamber 51 and the combustion-supporting chamber 52 are penetrated by an ejector 53, and the ejector 53 is coaxially arranged with the combustion mixing chamber. The ejector 53 is used to accelerate the combustible gas in the gas chamber 51 to be sprayed into the combustion mixing chamber, and a necked ejection channel 54 is formed between the combustion-supporting chamber 52 and the combustion mixing chamber, and the combustion-supporting gas in the combustion-supporting chamber 52 is ejected into the combustion mixing chamber through the ejection channel; an igniter 55, a flame detector 56 and a temperature detector 57 are arranged in the combustion mixing chamber.

[0076] The combustible gas enters the combustion chamber 51 from the gas inlet, is evenly pressure-distributed in the combustion chamber, and is ejected into the combustion mixing chamber through the ejector; the supporting combustion gas enters the supporting combustion chamber 52 from the supporting combustion gas port, flows through the ejector channel 54 and enters the combustion mixing chamber, where the combustible gas and the supporting combustion gas are mixed and burned to form high-temperature flue gas, which is quickly mixed with the gas in the denitrification flue to increase the flue gas temperature and meet the subsequent denitrification reaction.

[0077] The flame detector 56 and the temperature detector 57 are both electrically connected to the control system; the flame detector 56 is used to detect the combustion conditions of the flame in the combustion mixing chamber. If the flame is extinguished, the igniter is re-ignited through the control system to achieve stable combustion of the flame burner; the temperature detector 57 is used to detect the temperature in the combustion mixing chamber.

[0078] The combustible gas entering the gas flame swing burner can be blast furnace gas, converter gas, coke oven gas, natural gas, etc., or a mixture of blast furnace gas, converter gas, coke oven gas or natural gas. The combustion-supporting gas entering the gas flame swing burner can be air, pure oxygen, or the original flue gas in the flue containing a certain amount of oxygen, or a mixture of air, oxygen and original flue gas. The combustion-supporting gas can use the original flue gas in the denitrification flue as the combustion-supporting gas to carry out the combustion reaction of the gas flame swing burner, so as to realize the combustion of the combustible gas under the condition of low oxygen concentration, avoid the generation of NOx, and realize the low nitrogen combustion of the gas.

[0079] Further, if Figure 2As shown, the ejector 53 includes a straight pipe section 531, a contraction section 532, a throat section 533, an expansion section 534 and a rectification section 535. The straight pipe section 531 is located in the combustion chamber 51, and the contraction section 532, the throat section 533, the expansion section 534 and the rectification section 535 are located in the combustion-supporting chamber 52; an air inlet is arranged at the first end of the straight pipe section 531, and the second end of the straight pipe section 531 is connected to the first end of the contraction section 532, and the diameter of the contraction section 532 is gradually contracted from the first end to the second end, and the second end of the contraction section 532 is connected to the first end of the throat section 533, and the second end of the throat section 533 is connected to the first end of the expansion section 534, and the diameter of the expansion section 534 is gradually expanded from the first end to the second end, and the second end of the expansion section 534 is connected to the first end of the rectification section 535, and the second end of the rectification section 535 is provided with an air outlet. In a specific embodiment of the present invention, the distance between the air outlet of the ejector and the bottom of the combustion mixing chamber is between 100 and 300 mm, and the preferred range is 150 to 250 mm.

[0080] The gas flame swing burner 100 adopts the ejector jet technology, which reduces the load of the system fan, reduces the resistance loss of the flue, and improves the stability of the equipment operation.

[0081] Further, if Fig. 9 As shown, a first flange 58 is sleeved on the side wall of the combustion stabilizing flue 5, and the first flange 58 is used for sealing connection with the side wall of the denitrification flue. The first flange 58 is welded to the side wall of the combustion stabilizing flue 5.

[0082] A burner through hole is arranged on the side wall of the denitrification flue, and the combustion stabilizing flue 5 passes through the burner through hole. The diameter of the burner through hole is larger than the diameter of the combustion stabilizing flue 5. In a specific embodiment of the present invention, the distance between the inner wall of the burner through hole and the outer wall of the combustion stabilizing flue 5 is not less than 200 mm (that is, the difference between the radii of the two is not less than 200 mm), and the distance that the outlet end of the combustion stabilizing flue 5 penetrates into the side wall of the denitrification flue does not exceed 200 mm.

[0083] like Figure 5As shown, in a specific embodiment of the present invention, the cross-section of the outlet section of the gas flame swing burner 100 is square, including an outlet section inner layer and an outlet section inner layer, between which a refractory castable is arranged, and a first swing blade structure 3 and a second swing blade structure 4 are axially spaced and arranged in the inner cavity of the outlet section of the gas flame swing burner 100, each first blade 31 can swing around its vertical first rotation center axis under the drive of the first swing drive structure 1 (rotate and swing to the left or right in the figure), and each second blade 41 can swing around its horizontal second rotation center axis under the drive of the second swing drive structure 2 (rotate and swing upward or downward in the figure). The spatial swinging of the first swing blade structure 3 and the second swing blade structure 4 realizes the spatial adjustment of the direction of the flue gas flow stream ejected from the stable combustion flue, and through the spatial arrangement of the streams of multiple flame burners, the rapid mixing of the flue gas space is realized, the heat exchange of the flue gas is promoted, the local flue gas temperature is prevented from being too high, and the rapid temperature rise and temperature uniformity of the flue gas are realized.

[0084] like Figure 6 , Figure 7 , Figure 8 As shown, in another specific embodiment of the present invention, the cross section of the outlet section of the gas flame swing burner 100 is circular, the first swing blade structure 3 and the second swing blade structure 4 are evenly arranged in the circular cross section of the stable combustion flue, the first blade 31 and the second blade 41 are evenly distributed in a certain imaginary circle, and the center of the imaginary circle is on the same straight line as the center of the circular cross section of the stable combustion flue. The center line of the first fastening component 35 coincides with the diameter of the imaginary circle perpendicular to the length direction of the first blade, and the center line of the second fastening component coincides with the diameter of the imaginary circle perpendicular to the length direction of the second blade.

[0085] In the gas flame swing burner 100 of the present invention, the first swing blade structure 3, the second swing blade structure 4, the first rotating shaft jacket, the second rotating shaft jacket, and each rotating shaft, connecting shaft, etc. are made of heat-resistant and oxidation-resistant metal materials that can withstand a high temperature of 1100°C, such as ZG35Cr28Ni 16, 4Cr22Ni 10, high chromium alloy, ZG40Cr28Ni48W5Si2, ZG40Cr9Si2, etc., preferably 0Cr25Ni20. A heat-resistant coating is sprayed on the surface of the heat-resistant and oxidation-resistant metal material, and the heat-resistant coating has high wear resistance and can achieve high temperature resistance, oxidation resistance, and thermal shock resistance.

[0086] like Fig.10As shown, the present invention also provides a direct-fired heating device 200 for a denitrification system, comprising a plurality of the aforementioned gas flame swinging burners 100, wherein the plurality of gas flame swinging burners 100 constitute a burner group, wherein the center line of the flame stream of each gas flame swinging burner of the burner group is tangent to an imaginary tangent circle, and the first swinging blade structure 3 and the second swinging blade structure 4 of each gas flame swinging burner can swing to adjust the flame injection angle.

[0087] In this embodiment, the direct-fired heating device 200 for the denitrification system includes at least two burner groups, and the number of burner groups is an even number; the center line of the flame flow of each gas flame swinging burner 100 of each burner group is tangent to an imaginary tangent circle, and the center line of each flame flow of two adjacent burner groups is opposite to the cutting direction of the imaginary tangent circle 201; the flame injection direction of each gas flame swinging burner 100 is opposite to the flue gas flow direction, and the flame injection length of each gas flame swinging burner 100 is adjustable. By adjusting the flow rate and ratio of the combustible gas and the combustion-supporting gas of the gas flame swinging burner 100, the flame length of the gas flame swinging burner 100 can be adjusted.

[0088] The center line of each flame stream of two adjacent burner groups is set opposite to the cutting direction of the imaginary tangent circle, that is, the center line of each flame stream of two adjacent burner groups and the cutting direction of the imaginary tangent circle adopt the opposite swirl mode, eliminating the impact of the two groups of swirl flame burners and realizing the stable operation of the swirl. The number of burner groups is an even number to ensure the stable operation of the heating device.

[0089] The flame spray length of each gas flame swinging burner 100 can be adjusted, the diameter of the imaginary tangent circle tangent to the center line of the flame flow of each gas flame swinging burner 100 of each burner group is different, and the height position of the imaginary tangent circle is different. Different swirl mixing area controls can be achieved under different flue gas flow conditions. The position of the high temperature zone of the flame in the flue is adjustable to achieve dynamic adjustment of the flue gas mixing.

[0090] The denitrification flue 9 is a rectangular flue and is arranged vertically. The center line of the two opposite side walls (front side wall 91 and rear side wall 92) of the denitrification flue 9 is the hedging center line. The flame burners are divided into two groups. Each burner group includes four gas flame swing burners 100. The gas flame swing burners 100 are in the form of tangential combustion. The gas streams of the gas flame swing burners 100 are fed in a tangential manner. Each gas flame swing burner 100 forms an octagonal double tangential combustion structure. The center line of the flame streams sprayed by each group of gas flame swing burners 100 is tangential to the same imaginary tangential circle (ellipse or circle), and the rotation directions of the two groups of imaginary tangential circles (ellipse or circle) are opposite, one is clockwise and the other is counterclockwise.

[0091] In actual engineering applications, gas flame swing burners 100 can be appropriately added to the front side wall 91 and the rear side wall 92 according to the cross-sectional size of the denitrification flue 9; gas flame swing burners 100 can also be appropriately added to the other two side walls of the denitrification flue 9.

[0092] like Fig.10 As shown, in a specific embodiment of the present invention, the angles between the eight gas flame swing burners 100 and the side walls of the vertical denitrification flue 9 are β 1 , β 2 , β 3 , β 4 , β 5 , β 6 , β 7 , β 8 , which ranges from 15° to 85°, and preferably ranges from 30° to 65°.

[0093] The present invention adopts the swirl effect of Laval nozzle injection and the double tangential circle arrangement. The two groups of imaginary tangential circles adopt opposite swirl modes, eliminating the impact of the two groups of swirl gas flame swing burners 100 and achieving stable operation of the swirl.

[0094] In the direct-fired heating device for the denitration system of the present invention, a plurality of gas flame swing burners are arranged in groups in the denitration flue, and the flame combustion heat of the gas flame swing burners is used to directly heat the flue gas, thereby improving the heat utilization efficiency and reducing the heat loss; the plurality of gas flame swing burners in the denitration flue are grouped, and the kinetic energy of the flame jet of the gas flame swing burner is used to prompt the flue gas to form a swirl zone, thereby realizing the dynamic swirl effect of the flue gas, promoting the turbulent flow of the flue gas, promoting the heat exchange between the flue gas and the high-temperature flame, shortening the length of the heat exchange zone in the flue, and realizing the temperature uniformity; the flame jet direction of the gas flame swing burner is consistent with the direction of the flue gas flow The two blades are arranged opposite to each other, which promotes rapid and efficient heat exchange between the flue gas and the high-temperature flame, shortens the time required for heat exchange, reduces the flue length required for uniform flue gas temperature, and promotes uniform temperature in the flue; the first swing blade structure and the second swing blade structure in each gas flame swing burner can swing to adjust the flame injection angle to meet the requirements of dynamic heating in different areas and realize dynamic adjustment of the size and intensity of the swirl area; the direct-fired heating device for the denitrification system of the present invention directly heats the flue gas, causes the flue gas temperature to reach the temperature range of the ideal denitrification reaction of the catalyst, realizes the expected denitrification reaction, meets the ultra-low emission requirements, and improves the economic benefits of equipment operation.

[0095] As described above, the gas flame swing burner provided by the present invention has the following beneficial effects:

[0096] In the gas flame swing burner provided by the present invention, the first swing driving structure can drive the first swing blade structure to swing, and the second swing driving structure can drive the second swing blade structure to swing, and the two can swing independently or simultaneously, so as to realize the function of dynamically adjusting the flame injection angle online in real time, meet the requirements of dynamic heating of different areas, realize the dynamic adjustment of the size and intensity of the flame combustion area, meet the function of dynamically adjusting the size and position of the flame combustion area in the denitrification flue, promote the process requirements of rapid heat exchange between the high-temperature burning flue gas and the gas in the denitrification flue, accurately control the temperature of the mixed flue gas, realize efficient flue gas denitrification reaction, and realize ultra-low emission of flue gas; a burner of natural gas, blast furnace gas or other combustible gas is arranged in the flue to directly heat the flue gas, which can cause the flue gas temperature to reach the temperature range of the ideal denitrification reaction of the catalyst, meet the ultra-low emission requirements, and improve the economic benefits of equipment operation; the ejector jet technology is adopted to reduce the load of the system fan, reduce the resistance loss of the flue, and improve the stability of equipment operation;

[0097] In the direct-fired heating device for the denitration system of the present invention, a plurality of gas flame swing burners are arranged in groups in the denitration flue, and the flame combustion heat of the gas flame swing burners is used to directly heat the flue gas, thereby improving the heat utilization efficiency and reducing the heat loss; the plurality of gas flame swing burners in the denitration flue are grouped, and the kinetic energy of the flame jet of the gas flame swing burner is used to prompt the flue gas to form a swirl zone, thereby realizing the dynamic swirl effect of the flue gas, promoting the turbulent flow of the flue gas, promoting the heat exchange between the flue gas and the high-temperature flame, shortening the length of the heat exchange zone in the flue, and realizing the temperature uniformity; the flame jet direction of the gas flame swing burner is consistent with the direction of the flue gas flow The two blades are arranged opposite to each other, which promotes rapid and efficient heat exchange between the flue gas and the high-temperature flame, shortens the time required for heat exchange, reduces the flue length required for uniform flue gas temperature, and promotes uniform temperature in the flue; the first swing blade structure and the second swing blade structure in each gas flame swing burner can swing to adjust the flame injection angle to meet the requirements of dynamic heating in different areas and realize dynamic adjustment of the size and intensity of the swirl area; the direct-fired heating device for the denitrification system of the present invention directly heats the flue gas, causes the flue gas temperature to reach the temperature range of the ideal denitrification reaction of the catalyst, realizes the expected denitrification reaction, meets the ultra-low emission requirements, and improves the economic benefits of equipment operation.

[0098] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A gas flame swing burner, characterized in that: The burner comprises a burner body structure, a first swing drive structure and a second swing drive structure, wherein the burner body structure comprises a combustion stabilizing flue, a first swing blade structure and a second swing blade structure which are axially spaced in the combustion stabilizing flue and can swing to change the flame injection angle, the first swing drive structure can drive the first swing blade structure to swing, and the second swing drive structure can drive the second swing blade structure to swing; The first swing blade structure comprises a plurality of first blades spaced in parallel and capable of swinging synchronously, each first blade is provided with a first rotation center axis along its length direction, and the first swing driving structure can drive each first blade to swing around its first rotation center axis; the second swing blade structure comprises a plurality of second blades spaced in parallel and capable of swinging synchronously, each second blade is provided with a second rotation center axis along its length direction, and the second swing driving structure can drive each second blade to swing around its second rotation center axis; the first rotation center axis and the second rotation center axis are arranged at a first angle; The inner cavity of the combustion stabilizing flue is connected to form a combustion mixing chamber, the first swing blade structure and the second swing blade structure are arranged at the first end of the combustion mixing chamber, the second end of the combustion mixing chamber is connected to form a combustion-supporting chamber and a gas chamber, the gas chamber and the combustion-supporting chamber are penetrated by an ejector, the ejector is coaxially arranged with the combustion mixing chamber, the ejector is used to accelerate the combustible gas in the gas chamber to be sprayed into the combustion mixing chamber, a necked ejection channel is formed between the combustion-supporting chamber and the combustion mixing chamber, the combustion-supporting gas in the combustion-supporting chamber is ejected into the combustion mixing chamber through the ejection channel; an igniter, a flame detector and a temperature detector are arranged in the combustion mixing chamber; Each of the first blades is arranged vertically, and each of the second blades is arranged horizontally.

2. The gas flame swing burner according to claim 1, characterized in that: A first blade is set as a first active blade, and the other first blades are set as first driven blades. The first swinging blade structure includes a first active shaft and a first driven shaft. The first active shaft is connected to the first end of the first active blade, and the first driven shaft is connected to the second end of the first active blade. The first swinging drive structure can drive the first active shaft to drive the first active blade to rotate; the first active shaft and the first driven shaft are both coaxially arranged with the first rotation center axis; the first end and the second end of each first driven blade are respectively hinged to the side wall of the stable combustion flue through the first connecting shaft; each first connecting shaft is arranged parallel to the first rotation center axis; the first active blade is connected to each first driven blade through a first fastening assembly.

3. The gas flame swing burner according to claim 2, characterized in that: The first swing driving structure includes a first fixed base, a first telescopic cylinder and a first swing connecting rod. The first end of the first fixed base is fixedly connected to the stable combustion flue, the second end of the first fixed base is rotatably connected to the first end of the first telescopic cylinder, the second end of the first telescopic cylinder is hinged to the first end of the first swing connecting rod, the second end of the first swing connecting rod is connected to the first active rotating shaft, and the first swing connecting rod is used to drive the first active rotating shaft to rotate around its central axis.

4. The gas flame swing burner according to claim 1, characterized in that: A second blade is set as a second active blade, and the other second blades are set as second driven blades. The second swinging blade structure includes a second active shaft and a second driven shaft. The second active shaft is connected to the first end of the second active blade, and the second driven shaft is connected to the second end of the second active blade. The second swinging drive structure can drive the second active shaft to drive the second active blade to rotate; the second active shaft and the second driven shaft are both coaxially arranged with the second rotation center axis; the first end and the second end of each second driven blade are respectively hinged to the side wall of the stable combustion flue through a second connecting shaft; each second connecting shaft is arranged parallel to the second rotation center axis; the second active blade is connected to each second driven blade through a second fastening assembly.

5. The gas flame swing burner according to claim 4, characterized in that: The second swing driving structure includes a second fixed base, a second telescopic cylinder and a second swing connecting rod. The first end of the second fixed base is fixedly connected to the stable combustion flue, the second end of the second fixed base is rotatably connected to the first end of the second telescopic cylinder, the second end of the second telescopic cylinder is hinged to the first end of the second swing connecting rod, the second end of the second swing connecting rod is connected to the second active rotating shaft, and the second swing connecting rod is used to drive the second active rotating shaft to rotate around its central axis.

6. The gas flame swing burner according to claim 1, characterized in that: A first protective shell is buckled on the outer side of the first swing driving structure, and a second protective shell is buckled on the outer side of the second swing driving structure.

7. The gas flame swing burner according to claim 1, characterized in that: The spacing between the first swing blade structure and the second swing blade structure along the axial direction of the stable combustion flue is 15 to 45 mm; the spacing between adjacent first blades is 50 to 250 mm, and the spacing between adjacent second blades is 50 to 250 mm.

8. The gas flame swing burner according to claim 1, characterized in that: A first flange is sleeved on the side wall of the stable combustion flue, and the first flange is used for sealing connection with the side wall of the denitrification flue.

9. A direct-fired heating device for a denitration system, characterized in that: It comprises a plurality of gas flame swinging burners as described in any one of claims 1 to 8, wherein the plurality of gas flame swinging burners constitute a burner group, the center line of the flame stream of each gas flame swinging burner of the burner group is tangent to an imaginary tangent circle, and the first swinging blade structure and the second swinging blade structure of each gas flame swinging burner can swing to adjust the flame injection angle; the direct-fired heating device for the denitrification system comprises at least 2 burner groups, and the number of the burner groups is an even number; the center line of the flame stream of each gas flame swinging burner of each burner group is tangent to an imaginary tangent circle, and the center lines of each flame stream of two adjacent burner groups are arranged opposite to the cutting direction of the imaginary tangent circle.

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