CN220453658U

CN220453658U - Flat flame ultralow NOx gas burner

Info

Publication number: CN220453658U
Application number: CN202321938603.7U
Authority: CN
Inventors: 任政; 何卫国; 任征军
Original assignee: Yueyang Hengsheng Petrochemical Technology Co ltd
Current assignee: Yueyang Hengsheng Petrochemical Technology Co ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2024-02-06
Anticipated expiration: 2033-07-24

Abstract

The utility model discloses a flat flame ultralow NOx gas burner, which comprises a main body, a fire basin brick and an air regulating butterfly valve, wherein the inner sides of the main body and the fire basin brick are provided with a pilot burner, and the outer sides of the main body and the fire basin brick are provided with an outer air gun and an inner air gun; the appearance section of the fire basin brick is a rectangle and trapezoid combined body, the lower end of the fire basin brick is a rectangle, and two sides of the fire basin brick are provided with a plurality of pipe grooves and a plurality of inclined fuel perforation holes; the air gun is provided with a plurality of branch gun barrels corresponding to the pipe slots, and the spray heads of the branch gun barrels are provided with a plurality of fuel spray holes, so that fuel classification, flue gas backflow and staged mixing and combustion of fuel gas and air on the section of a medium flow passage are realized, a flat flame shape is organized, the surface temperature of the flame is balanced, a balanced temperature flow field is formed, and double ultra-low emission of CO and NOx is realized; the burner solves the problem of adjusting the ignition and low-nitrogen combustion of the burner under various working conditions, and has the characteristics of wide temperature range of a hearth, wide fuel heat value range and large fuel flow change.

Description

Flat flame ultralow NOx gas burner

Technical Field

The utility model relates to the technical field of energy conservation and environmental protection of heating furnaces in petroleum refining industrial processes, in particular to a flat flame ultralow NOx gas burner.

Background

With the advanced and deep implementation of the emission standard of pollutants in petroleum refining industry (GB 31570-20015), large-scale low NOx burners are generally replaced by large-scale enterprises in middle petrochemical industry, which contributes to the environmental protection industry of China, but the NOx emission is greatly reduced, and under the same working condition of user feedback, after the burners are modified, the effect of reducing the NOx emission is obvious, but the fuel consumption is increased, and the combustion is insufficient, so that the CO emission in the flue gas is higher. Aiming at the problems, equipment manufacturers continue to improve on the basis of transformation, and the improvement is repeated, so that the requirements of complete users cannot be met, and the equipment manufacturers are not individual. This scenario illustrates that there is no ever a situation in pursuit of technological advances in combustion equipment.

In the petroleum refining industry in China at present, the NOx emission requirement of a burner in the transformation of a process heating furnace is upgraded, the emission index is generally required to be lower than 50mg/Nm3, the index requirement is probably not very difficult for a burner with a round flame type with the hearth temperature of 650-800 ℃, but the index requirement is very difficult for a flat flame burner, particularly a hearth with the temperature lower than 650 ℃ or higher than 850 ℃ or a hearth of a hydrogenation internal device, the hearth temperature and the burner load regulation ratio range are wide, the calorific value of an olefin device is far different from fuel, and the existing burner with the flat flame type is very difficult to meet the requirement in multiple aspects.

Therefore, the development of a novel flat-flame ultralow NOx gas burner capable of meeting the CO and NOx double-low requirements simultaneously is significant.

Disclosure of Invention

In view of the above technical problems in the related art, the present utility model provides a flat flame ultralow NOx gas burner, which can overcome the above drawbacks of the prior art.

In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:

a flat flame ultra low NOx gas burner;

the flat flame ultralow NOx gas burner comprises a main body, a fire basin brick arranged at the upper end of the main body and a wind regulating butterfly valve arranged at the front side of the main body, wherein a pilot burner is arranged at the inner sides of the main body and the fire basin brick, and an outer air gun and an inner air gun are arranged at the outer sides of the main body and the fire basin brick;

the appearance section of the fire basin brick is a rectangle and trapezoid combination, the lower end of the fire basin brick is a rectangle, and a plurality of longitudinal pipe grooves and a plurality of inward inclined fuel perforations are arranged on two sides of the fire basin brick;

the outer air gun is provided with a plurality of branch gun barrels corresponding to the pipe slots, and a spray head of each branch gun barrel is provided with a plurality of fuel spray holes.

Further, the trapezoid upper end of the fire pot brick is provided with a convex edge towards the inner space of the fire pot flow channel, two sides of the turning part of the convex edge in the fire pot are provided with semicircular grooves, the semicircular grooves are provided with lateral holes and vertical holes, the lateral holes and the vertical holes directly reach the side face and the upper surface of the fire pot brick, the fuel perforation is led to the semicircular grooves, and the inner space of the fire pot flow channel is flat.

Further, the number of the fuel spray holes is three, one spray hole is communicated with the inside of the fire pot brick through a fire pot fuel hole, the other two spray holes of the outer air gun form an included angle and are communicated with the inside of the fire pot brick through the fuel spray holes, and the outer air gun is further provided with an inner air gun distribution valve communicated with the inner air gun.

Further, the main part includes urceolus, roof flange, fire pan surrounding frame and fire pan bedplate from bottom to top in proper order, the bottom of main part is equipped with the bottom plate, be equipped with reserved fire on the bottom plate and examine hole, ignition hole, pilot lamp hole and sight hole in proper order, the top of main part is equipped with the sleeve pipe mount, be equipped with ignition guide slot and interior gun sleeve pipe in the sleeve pipe mount.

Further, the outer air gun comprises an outer air gun connecting pipe, front and rear rows of corresponding branch gun barrels are respectively arranged on the outer air gun connecting pipe, the total number of the branch gun barrels is 8, the top of each branch gun barrel is an outer spray head, and 3 fuel spray holes are formed in the spray heads.

Further, the inner air gun is communicated with the outer air gun through an inner air gun distribution valve, and the inner air gun comprises an air inlet flange, an inner air gun distribution pipe, an inner gun barrel, an inner spray head, a mounting flange, a flange sleeve and positioning screws.

Further, the lateral wall of the outer cylinder is provided with a pressure measuring port, and the outer cylinder comprises a ceramic fiber lining, a lining steel mesh and a partition plate.

Further, the number of the tube slots and the number of the fuel perforations are 8.

The utility model has the beneficial effects that: the fire basin of the product is provided with the lateral inclined fuel inlet and a plurality of lateral and vertical smoke outlet holes; the fuel classification spray holes of the spray heads of the external air guns are arranged; the combined implementation of the fire pot and the external air gun realizes the staged mixing and burning of fuel classification, flue gas backflow and classified fuel gas and air on the section of the medium flow channel, organizes a flat flame shape, balances the surface temperature of the flame, forms a balanced temperature flow field, is beneficial to inhibiting the generation of CO and the generation of thermal NOx, and realizes the double ultra-low emission of CO and NOx.

The burner body is provided with an ignition guide groove, so that the success of ignition is ensured, and besides the combination of the external air gun and the fire pot, the burner body is also provided with an internal air gun as a standby adjusting means. The burner has the characteristics of wide temperature range of a hearth, wide fuel heat value range and large fuel flow change, and is a flat-flame ultralow-nitrogen gas burner with double low emission of CO and NOx.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a front view of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 2 is a side view of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 3 is a top view of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 4 is a bottom view of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 5 is a perspective view of a burner tile of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 6 is a front cross-sectional view of a burner tile of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 7 is a side view of a burner tile of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 8 is a top view of a burner tile of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 9 is a front view of a main body of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 10 is a side view of a body of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 11 is a top view of a main body of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 12 is a front view of an outer air gun of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 13 is a side view of an outer air gun of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 14 is a top view of an outer air gun of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 15 is a front view of a flat flame ultra low NOx gas burner tip according to an embodiment of the present utility model.

Fig. 16 is a cross-sectional view taken along line E-E of fig. 15 of a flat flame ultra-low NOx gas burner in accordance with an embodiment of the present utility model.

Fig. 17 is a top view of a flat flame ultra low NOx gas burner tip according to an embodiment of the present utility model.

Fig. 18 is a front view of an inner air gun of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 19 is a side view of an inner air gun of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 20 is a top view of an inner air gun of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 21 is a front view of an inner nozzle tip of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

Fig. 22 is a cross-sectional view taken along line F-F of fig. 21 of a flat flame ultra-low NOx gas burner in accordance with an embodiment of the present utility model.

Fig. 23 is a top view of an inner nozzle tip of a flat flame ultra low NOx gas burner according to an embodiment of the present utility model.

In the figure: 1. Fire basin bricks; 1-1, a tube groove; 1-2, fuel perforation; 1-3, a semicircular groove; 1-4, the fire basin flow passage is hollow; 2. a main body; 2-1, an outer cylinder; 2-2, a top plate flange; 2-3, a fire basin surrounding frame; 2-4, a fire basin seat board; 2-5 parts of a bottom plate; 2-6, reserving a fire detection hole; 2-7, ignition holes; 2-8, a changming lamp hole; 2-9, a viewing hole; 2-10, an ignition guide groove; 2-11, an inner gun sleeve; 2-12, a sleeve fixing frame; 2-13, mounting bolts and nuts on the air gun; 2-14, pressure measuring port; 2-15, ceramic fiber lining; 2-16, lining steel mesh; 2-17, a separator; 2-18, a butterfly valve of a stroke path; 3. wind regulating butterfly valve; 4. a pilot lamp; 5. an external air gun; 5-1, a main gas flange; 5-2, a main gas connecting pipe; 5-3, collecting pipe; 5-4, an internal air gun distribution valve; 5-6, an inner air gun distribution connection pipe; 5-7, connecting the outer air gun; 5-8, an outer air gun distributing pipe; 5-9, mounting flanges; 5-10, an outer gun barrel; 5-11, outer nozzle; 6. An inner air gun; 6-1, an air inlet flange; 6-2, an inner air gun distributing pipe; 6-3, inner gun barrel; 6-4, inner spray heads; 6-5, mounting a flange; 6-7, a flange sleeve; 6-8, positioning screws.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the utility model, fall within the scope of protection of the utility model.

It should be understood that in the description of the embodiments of the present utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the embodiments of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of embodiments of the utility model, the meaning of "a number" is two or more, unless explicitly defined otherwise.

In order to facilitate understanding of the above technical solutions of the present utility model, the following describes the above technical solutions of the present utility model in detail by a specific usage manner.

As shown in fig. 1-23, the flat flame ultralow NOx gas burner according to the embodiment of the present utility model comprises a main body 2, a fire basin brick 1 arranged at the upper end of the main body 2, and a wind-adjusting butterfly valve 3 arranged at the front side of the main body 2, wherein a pilot burner 4 is arranged at the inner side of the main body 2 and the fire basin brick 1, and an outer air gun 5 and an inner air gun 6 are arranged at the outer side;

the fire basin brick 1 is a combined body of a rectangle and a trapezoid in appearance section, the lower end of the fire basin brick is a rectangle, and a plurality of longitudinal pipe grooves 1-1 and a plurality of inward inclined fuel perforation holes 1-2 are arranged on two sides of the fire basin brick 1;

the outer air gun 5 is provided with a plurality of branch gun barrels corresponding to the pipe slots 1-1, and a spray head of each branch gun barrel is provided with a plurality of fuel spray holes.

In some embodiments, the trapezoid upper end of the fire pot brick 1 is provided with a convex edge towards the fire pot flow channel inner space 1-4, two sides of the turning position of the convex edge in the fire pot are provided with semicircular grooves 1-3, the semicircular grooves 1-3 are provided with lateral holes and vertical holes, the lateral holes and the vertical holes directly reach the side face and the upper surface of the fire pot brick 1, the fuel perforation 1-2 is communicated with the semicircular grooves 1-3, and the fire pot flow channel inner space 1-4 is flat.

In some embodiments, the number of the fuel spray holes is three, one spray hole is communicated with the interior of the fire basin brick 1 through a fire basin fuel hole, the other two spray holes of the outer air gun 5 are communicated with the interior of the fire basin brick 1 through the fuel spray holes 1-2 at an included angle, and the outer air gun 5 is further provided with an inner air gun distribution valve 5-4 communicated with the inner air gun 6.

In some embodiments, the main body 2 sequentially comprises an outer cylinder 2-1, a top plate flange 2-2, a fire basin surrounding frame 2-3 and a fire basin seat plate 2-4 from bottom to top, a bottom plate 2-5 is arranged at the bottom of the main body 2, a reserved fire detection hole 2-6, an ignition hole 2-7, a pilot lamp hole 2-8 and a fire observation hole 2-9 are sequentially arranged on the bottom plate 2-5, a sleeve fixing frame 2-12 is arranged at the top of the main body 2, and an ignition guide groove 2-10 and an inner gun sleeve 2-11 are arranged in the sleeve fixing frame 2-12.

In some embodiments, the outer air gun 5 comprises an outer air gun connecting pipe 5-7, front and rear rows of corresponding branch gun barrels are respectively arranged on the outer air gun connecting pipe 5-7, the total number of the branch gun barrels is 8, the top of each branch gun barrel is an outer spray head 5-11, and 3 fuel spray holes are arranged on the spray heads 5-11.

In some embodiments, the inner air gun 6 is communicated with the outer air gun 5 through an inner air gun distribution valve 5-4, and the inner air gun 6 comprises an air inlet flange 6-1, an inner air gun distribution pipe 6-2, an inner gun barrel 6-3, an inner spray head 6-4, a mounting flange 6-5, a flange sleeve 6-7 and a positioning screw 6-8.

In some embodiments, the side wall of the outer cylinder 2-1 is provided with a pressure measuring port 2-14, and the outer cylinder 2-1 comprises a ceramic fiber lining 2-15, a lining steel mesh 2-16 and a partition plate 2-17.

In some embodiments, the number of tube slots 1-1 and the number of fuel perforations 1-2 are 8.

As shown in fig. 1 to 4, the flat flame ultralow NOx gas burner according to the embodiment of the present utility model is composed of a fire basin brick 1, a main body 2, a wind adjusting butterfly valve 3, a pilot burner 4, an outer air gun 5, an inner air gun 6, and the like, all of which are installed on the main body 2.

Wherein:

as shown in fig. 5-8, the shape section of the fire basin brick 1 is a rectangle and trapezoid combination, the lower end is rectangle, the side face is provided with 8 tube slots 1-1, the upper end is trapezoid, the lower part of the ladder side is corresponding to the tube slot position, 8 inward inclined fuel perforations 1-2 are arranged, the upper end of the trapezoid is provided with a convex edge towards the inner space 1-4 of the fire basin flow channel, two sides of the turning part of the convex edge in the fire basin are provided with semicircular slots 1-3, the semicircular slots 1-3 are provided with lateral holes n-d and vertical holes n-d, the material perforations 1-2 are led to the semicircular slots 1-3 until reaching the side face and the upper surface, and the inner space 1-4 of the fire basin flow channel is flat.

As shown in fig. 9 to 11, the main body 2 comprises an outer cylinder 2-1, a top plate flange 2-2, a fire pan surrounding frame 2-3, a fire pan seat plate 2-4, a bottom plate 2-5, a reserved fire detection hole 2-6, an ignition hole 2-7, a pilot lamp hole 2-8, a fire observation hole 2-9, an ignition guide groove 2-10, an inner gun sleeve 2-11, a sleeve fixing frame 2-12, an air gun mounting bolt and nut 2-13, a pressure measuring port 2-14, a ceramic fiber lining 2-15, a lining steel mesh 2-16, a partition plate 2-17, a middle channel butterfly valve 2-18 mounting bolt and nut and the like. The body part is a carrier for the other parts, all of which are mounted on the body when assembled.

As shown in FIG. 12-14, the outer air gun 5 is composed of a main air flange 5-1, a main air connecting pipe 5-2, a collecting pipe 5-3, an inner air gun distributing valve 5-4, an inner air gun distributing connecting pipe 5-6, an outer air gun connecting pipe 5-7, an outer air gun distributing pipe 5-8, a mounting flange 5-9, an outer gun barrel 5-10, an outer nozzle 5-11 and the like.

The outer air gun is provided with 8 branched barrels, divided into two rows, and the nozzle 5-11 is provided with 3 or more fuel nozzles, as shown in fig. 15-17. The fuel jet is sprayed into the fire pot through the fire pot fuel hole by 1 spray hole, and the fuel jet is sprayed into the fire pot fuel hole by the axial included angle gamma, so that the fuel is the first-stage fuel. The other 2 spray holes form an included angle alpha, and spray fuel jet flow towards the flame direction from the lateral inclination angle beta of the fire pan, so that the fuel jet flow is the second-stage fuel. The negative pressure generated by the high-speed jet flow of the primary fuel entrains the flue gas in the furnace to enter the fire basin, so that the circulation of the flue gas in the furnace is realized; the graded primary fuel is uniformly mixed with air and circulated, flame is ignited by a pilot burner 4, flue gas is sprayed out from a plurality of lateral and vertical small holes at the outlet of a fire pot, and secondary fuel gas is sprayed out, so that the combination implementation of the fire pot and an external air gun realizes the sectional mixing and combustion of the graded fuel gas and air on the rectangular fluid section, organizes the shape of flat flame, balances the surface temperature of the flame, forms a balanced temperature flow field, is beneficial to inhibiting the generation of CO and the generation of thermal NOx, and realizes the double ultra-low emission of CO and NOx. The outer air gun 5 is also provided with an inner air gun gas distribution valve 5-4, so that the inner air gun is convenient to use and adjust flame;

as shown in fig. 18-23, the inner air gun 6 consists of an air inlet flange 6-1, an inner air gun distributing pipe 6-2, an inner gun barrel 6-3, an inner spray head 6-4, a mounting flange 6-5, a flange sleeve 6-7, a positioning screw 6-8 and the like. The part 5 is used as a standby for the main purpose, the fuel gas is introduced from the part 5, when the heat value of the fuel is greatly changed, the hearth is operated at a low temperature or the adjustment ratio is large, the part 6 is opened, the distribution proportion of the primary fuel gas is increased into the fire pan, and the combustion condition is adjusted.

The ignition guide grooves 2-10 on the main diagram have the functions of ensuring that an ignition rod accurately extends to a flame stabilizing port of the pilot lamp during ignition and ensuring that the pilot lamp is successfully ignited once.

The wind regulating butterfly valve 3 and the main body 2 are connected by a flange, so that the wind regulating handle direction is exchanged.

When the burner is installed, the burner main body installation top flange is fixed on the bottom plate of the heating furnace through bolts and nuts, and the air duct and the burner air adjusting butterfly valve are connected. The main body is a mounting carrier of other components, when the burner is integrally assembled, the fire pot bricks are arranged on the fire pot brick seat plate, the fire pot surrounding frame is positioned, and after the fire pot is in place, the gap between the fire pot and the furnace bottom lining is filled with refractory filler; respectively inserting a pilot lamp and an inner air gun into the pilot lamp mounting hole and the inner gun sleeve, and fastening a flange by bolts and nuts; inserting the outer gun into the installation position of the top flange of the main body, and fixing a bolt and a nut on the top flange;

the outer air gun distribution valve is connected with the inner air gun air inlet flange and is tightly sealed; the parts of the burner are connected into a whole through installation. And finally, connecting the pilot burner, the main fuel gas inlet and the respective interfaces on the fuel pipe respectively by using metal hoses to finish the connection and installation of the fuel pipe of the burner.

The ignition of the burner adopts a two-stage safe ignition mode that the pilot lamp is firstly ignited and then the pilot lamp is mainly ignited. During ignition, the ignition rod accurately extends to the flame stabilizing opening of the pilot lamp along the ignition guide groove, so that the pilot lamp is ensured to be successfully ignited at one time.

When the fire pot works, on one hand, combustion air enters the inner cavity of the main body from the air regulating butterfly valve and flows to the air flow channel in the fire pot; on the other hand, the fuel gas enters the outer air gun collecting pipe from the fuel pipeline connector, enters the outer air gun distribution gun barrel in two ways, is redistributed to 8 branch gun barrels, is sprayed out from 3 spray holes of the outer air gun spray head, part of the fuel gas is sprayed into the fire pot through the inclined fuel holes arranged on the fire pot to form a fuel jet flow, and the other 2 spray holes form an included angle alpha to spray the fuel jet flow towards the flame direction towards the lateral inclination angle beta of the fire pot, so that the fuel gas is the second-stage fuel. The negative pressure generated by the high-speed jet flow of the primary fuel entrains the flue gas in the furnace to enter the fire basin, so that the circulation of the flue gas in the furnace is realized; the primary fuel classified in the fire pot is uniformly mixed with air and circulating smoke, the primary fuel is ignited by a pilot burner flame, the smoke of the burner is sprayed out from a plurality of lateral and vertical small holes at the outlet of the fire pot to ignite secondary fuel gas, and the fire pot and an external air gun are combined for implementation, so that the sectional mixing and burning of the classified fuel gas and the air on a rectangular fluid section are realized, the flat flame shape is organized, the flame surface temperature is balanced, a balanced temperature flow field is formed, the generation of CO and the generation of thermal NOx are favorably inhibited, and the double ultra-low emission of CO and NOx is realized. The outer air gun is also provided with an inner air gun gas distribution valve, so that the inner air gun is convenient to use and adjust flame;

the main purpose of the inner air gun is to be used as a standby, the fuel gas is introduced from the outer air gun, when the fuel heat value change is large, the hearth is in low-temperature operation or the adjustment ratio is large, the fuel gas distribution valve on the outer air gun is opened, the distribution proportion of the primary fuel gas is increased into the fire pan, and the combustion condition is adjusted. The burner has the characteristics of wide applicable hearth temperature range, wide fuel heat value range and large fuel flow change.

The combination of a plurality of innovation points, the burner achieves the purposes of fuel classification, flue gas backflow, rapid and uniform mixing of fuel gas, sectional combustion, flame stabilization and double low emission of CO and NOx.

The structural principle of the utility model;

in the structural principle, the burner main body is mainly used for installing and bearing all parts, so that the ignition is convenient, and the disassembly and assembly are convenient; the fire pot focuses on flame shaping, mixing of fuel gas and stable combustion; the outer air gun emphasizes the fuel classification of the spray holes of the spray heads; the outer air gun nozzle sprays one fuel jet into the fire pot through the fire pot fuel hole, which is first-stage fuel gas, and the other 2 fuel jets form an included angle with the side inclination angle of the fire pot to spray out towards the flame direction, which is second-stage fuel. The negative pressure generated by the high-speed jet flow of the primary fuel entrains the flue gas in the furnace to enter the fire basin, so that the circulation of the flue gas in the furnace is realized; the primary fuel classified in the fire pot is uniformly mixed with air and circulating smoke, the primary fuel is ignited by a pilot burner flame, the smoke of the burner is sprayed out from a plurality of lateral and vertical small holes at the outlet of the fire pot to ignite secondary fuel gas, and the fire pot and an external air gun are combined for implementation, so that the sectional mixing and burning of the classified fuel gas and the air on a rectangular fluid section are realized, the flat flame shape is organized, the flame surface temperature is balanced, a balanced temperature flow field is formed, the generation of CO and the generation of thermal NOx are favorably inhibited, and the double ultra-low emission of CO and NOx is realized. The outer air gun is also provided with an inner air gun gas distribution valve, so that the inner air gun is convenient to use and adjust flame;

when the change of the heat value of the fuel is large, the hearth is in low-temperature operation or the adjustment ratio is large, the gas distribution valve on the outer air gun is opened, the distribution proportion of the primary gas is increased in the fire pot, and the combustion condition is adjusted. The burner has the characteristics of wide applicable hearth temperature range, wide fuel heat value range and large fuel flow change.

The classification spray holes of the outer air gun spray heads are arranged, so that the classification of fuel is realized; the sprayed primary fuel gas enters the fire pot through the fire pot fuel hole, and the primary fuel gas sprays kinetic energy to entrain flue gas in the furnace into the fire pot, so that the circulation of the flue gas in the furnace is realized; the primary fuel classified in the fire pot is uniformly mixed with air and circulating smoke, the primary fuel is ignited by the flame of a pilot burner, and the smoke of the burner is sprayed out from a plurality of lateral and vertical small holes at the outlet of the fire pot to ignite secondary fuel gas; the combination implementation of the fire pot and the external air gun realizes the sectional mixing and burning of the graded fuel gas and the air on the rectangular fluid section, organizes a flat flame shape, balances the surface temperature of the flame, forms a balanced temperature flow field, is beneficial to inhibiting the generation of CO and the generation of thermal NOx, and realizes the double ultra-low emission of CO and NOx. The outer air gun is also provided with an inner air gun, so that the inner air gun is convenient to use and adjust flame;

when the gas distribution valve of the internal air gun is opened, the grading proportion of primary gas sprayed into the fire pan can be increased, and the combustion condition can be adjusted. The burner can better adapt to the requirements of low emission of flue gas NOx and CO under the working condition of wide temperature range of a hearth, wide range of fuel heat value and large change of fuel flow, and can be used as a spare operation regulation and control means of the burner.

In summary, by means of the above technical solution of the present utility model, the fire pan of the present utility model is provided with the lateral inclined fuel inlet and a plurality of lateral and vertical smoke outlet; the fuel classification spray holes of the spray heads of the external air guns are arranged; the combined implementation of the fire pot and the external air gun realizes the staged mixing and burning of fuel classification, flue gas backflow and classified fuel gas and air on the section of the medium flow channel, organizes a flat flame shape, balances the surface temperature of the flame, forms a balanced temperature flow field, is beneficial to inhibiting the generation of CO and the generation of thermal NOx, and realizes the double ultra-low emission of CO and NOx.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. The flat flame ultralow NOx gas burner is characterized by comprising a main body (2), a fire basin brick (1) arranged at the upper end of the main body (2) and a wind regulating butterfly valve (3) arranged at the front side of the main body (2), wherein a pilot burner (4) is arranged at the inner sides of the main body (2) and the fire basin brick (1), and an outer air gun (5) and an inner air gun (6) are arranged at the outer sides of the main body and the fire basin brick;

the appearance section of the fire basin brick (1) is a rectangle and trapezoid combination, the lower end of the fire basin brick is a rectangle, and a plurality of longitudinal pipe grooves (1-1) and a plurality of inward inclined fuel perforations (1-2) are arranged on two sides of the fire basin brick (1);

the outer air gun (5) is provided with a plurality of branch gun barrels corresponding to the pipe grooves (1-1), and a spray head of each branch gun barrel is provided with a plurality of fuel spray holes.

2. The flat flame ultralow NOx gas burner of claim 1, wherein the trapezoid upper end of the fire pot brick (1) is provided with a convex edge towards the inner space (1-4) of the fire pot flow channel, semicircular grooves (1-3) are arranged on two sides of the turning part of the convex edge in the fire pot, the semicircular grooves (1-3) are provided with lateral holes and vertical holes, the lateral holes and the vertical holes directly reach the side face and the upper surface of the fire pot brick (1), the fuel perforation holes (1-2) are communicated with the semicircular grooves (1-3), and the inner space (1-4) of the fire pot flow channel is flat.

3. The flat flame ultralow NOx gas burner according to claim 1, wherein the number of the fuel spray holes is three, one spray hole is communicated with the interior of the fire basin brick (1) through a fire basin fuel hole, the other two spray holes of the outer air gun (5) are communicated with the interior of the fire basin brick (1) through the fuel spray holes (1-2) at an included angle, and the outer air gun (5) is further provided with an inner air gun distribution valve (5-4) communicated with the inner air gun (6).

4. The flat-flame ultralow NOx gas burner according to claim 2, wherein the main body (2) sequentially comprises an outer cylinder (2-1), a top plate flange (2-2), a fire basin surrounding frame (2-3) and a fire basin seat plate (2-4) from bottom to top, a bottom plate (2-5) is arranged at the bottom of the main body (2), a reserved fire detection hole (2-6), an ignition hole (2-7), a pilot lamp hole (2-8) and a fire observation hole (2-9) are sequentially arranged on the bottom plate (2-5), a sleeve fixing frame (2-12) is arranged at the top of the main body (2), and an ignition guide groove (2-10) and an inner gun sleeve (2-11) are arranged in the sleeve fixing frame (2-12).

5. The flat-flame ultralow NOx gas burner according to claim 2, wherein the outer air gun (5) comprises an outer air gun connecting pipe (5-7), front and rear rows of corresponding branch gun barrels are respectively arranged on the outer air gun connecting pipe (5-7), the total number of the branch gun barrels is 8, an outer spray head (5-11) is arranged at the top of the branch gun barrel, and 3 fuel spray holes are arranged on the spray head (5-11).

6. A flat flame ultra low NOx gas burner according to claim 3, wherein the inner air gun (6) is arranged in communication with the outer air gun (5) via an inner air gun distribution valve (5-4), the inner air gun (6) comprising an air inlet flange (6-1), an inner air gun distribution pipe (6-2), an inner barrel (6-3), an inner nozzle (6-4), a mounting flange (6-5), a flange sleeve (6-7) and a set screw (6-8).

7. The flat flame ultra-low NOx gas burner according to claim 4, wherein the side wall of the outer cylinder (2-1) is provided with a pressure measuring port (2-14), and the outer cylinder (2-1) comprises a ceramic fiber lining (2-15), a lining steel mesh (2-16) and a partition plate (2-17).

8. A flat flame ultra low NOx gas burner according to any of claims 1 to 7, wherein the number of tube slots (1-1) and fuel perforations (1-2) is 8.