CN219414768U

CN219414768U - Ultralow nitrogen gas combustor with double low emissions of CO and NOx

Info

Publication number: CN219414768U
Application number: CN202223162753.1U
Authority: CN
Inventors: 任政; 何卫国; 任征军; 翟晓航
Original assignee: Yueyang Hengsheng Petrochemical Technology Co ltd
Current assignee: Yueyang Hengsheng Petrochemical Technology Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-07-25
Anticipated expiration: 2032-11-28

Abstract

The utility model relates to the technical field of energy conservation and environmental protection of heating furnaces in petroleum refining industry, and particularly discloses an ultralow nitrogen gas burner with double low emissions of CO and NOx. According to the technical scheme, double low emission of CO and NOx is realized through fuel classification, air flow equalization, rapid and uniform mixing of fuel gas and air, sectional combustion and flame stabilization of the burner.

Description

Ultralow nitrogen gas combustor with double low emissions of CO and NOx

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 an ultralow nitrogen gas burner with double low emissions of CO and NOx.

Background

In recent years, a batch of low NOx burners are generally replaced by various large-scale enterprises in medium petrifaction, which contributes to environmental protection, but the fuel consumption is increased when partial unit feedback is given out equally while the nitrogen reducing effect is outstanding, and in essence, although the nitrogen reducing effect of some low NOx burners is obvious, the low NOx burners are insufficiently combusted, so that CO in flue gas is higher, the energy consumption is increased, and hidden danger is brought to safety production.

For hydrocarbon fuels, combustion products of the hydrocarbon fuels are related to the mixing condition of the fuels and air, carbon in the fuels is generally combusted through two stages, CO is generated by first combusting, and then complete combustion is generated in the subsequent combustion process, because the re-ignition point of the CO is not a constant, the uncertainty is generally considered to be generated, besides the physicochemical property of the CO, the uncertainty is influenced by the mixing concentration of the CO and combustion air and the mixing gas pressure, so that for a heating furnace with the hearth temperature lower than 605 ℃, the generation of the CO is required to be fundamentally inhibited, rather than hopefully reducing the CO by high-temperature flue gas (the existing partial low-nitrogen burner is basically generating a large amount of CO firstly, reducing the NOx to a lower level by utilizing the reduction characteristic of the CO, then reducing the CO by secondary combustion by high temperature in the furnace, and the ultrahigh condition of the CO is generated without high-temperature hearth condition).

Therefore, it is significant to develop an energy-saving and environment-friendly burner which can ensure low NOx emission and low CO emission.

Disclosure of Invention

The utility model aims to provide an ultralow nitrogen gas burner with double low emission of CO and NOx, which is characterized in that the fuel is graded, the air is graded, the innovation is improved, and the ultralow nitrogen gas burner with double low emission of CO and NOx is provided, and the uniform and rapid mixing of split fuel gas and air is enhanced to form a flame which is stable, so that the surface temperature of the flame is balanced, the generation of CO and the generation of thermal NOx are effectively inhibited, the double low emission of CO and NOx is realized, and the problems in the background art are solved.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an ultralow nitrogen gas combustor of two low emissions of CO, NOx, includes the main part, still installs the fire pan brick on the main part, and the pilot burner, annular outer air gun, central air gun, air regulating valve, central air gun pass through metal collapsible tube and annular outer air gun, is provided with the three-way pipe in the middle of the metal collapsible tube.

As a preferred implementation mode of the technical scheme of the application, 8 pipe grooves are formed in the lower end of the outer diameter of the fire pan brick 1, the upper end of the outer diameter is a frustum, the lower part of the side of the cone corresponds to the position of the pipe groove, 8 inward axial fuel perforations are formed in the position corresponding to the pipe grooves, a convex edge is arranged inwards on the upper end of the frustum, an annular groove is formed in the turning position of the inner convex edge of the fire pan, a horizontal hole n-d and a vertical hole n-d are formed in the annular groove, the side surface and the upper surface of the cone are directly contacted, and the fuel perforations are led to the annular groove.

As a preferred embodiment of the technology of the present application, the main body is composed of a bottom plate, a pilot lamp sleeve, a partition plate, an outer cylinder, a ceramic fiber lining, a steel plate net, a central sleeve, a first mounting flange, a brick fixing sleeve, 2-10 fire basin seat plates, a central sleeve support, a flame stabilizing disc, an inner lining ring, an annular outer air gun sleeve, cross slot screws, air deflectors, a fire viewing hole, a high-strength bolt, a fire detection hole, an ignition hole and the like. Structurally, the outer air gun sleeve is arranged on the periphery of the outer cylinder, the air deflector is arranged in the main body, the main body part is supported by other parts, and when the annular outer air gun is assembled, the annular outer air gun is inserted and installed from the first mounting flange, and other parts are inserted and installed from the bottom plate of the outer air gun, as shown in figure 1. The peripheral arrangement of the air gun shortens the working length of the annular outer air gun, so that the air gun is more convenient to disassemble and the installation position is more accurate; the air deflector is used for preventing the structure that combustion-supporting wind drift produced, and during operation, through the air deflector shelter from, combustion-supporting wind from the quick reposition of redundant personnel diffusion in both ends about the air deflector, evenly be full of main part and fire pan inner chamber combination fluid flame path interval, with the one-level gas jet of equipartition, produce quick homogeneous mixing, the drift of combustion-supporting wind has been reduced in the setting of air deflector, the flame length that has avoided leading to because of the drift of combustion-supporting wind is irregular, be favorable to stabilizing flame, balanced flame surface temperature, the formation of suppression CO and thermal type NOx.

As a preferred implementation mode of the technical scheme of the application, the annular outer air gun consists of a spray head, a connecting sleeve, a gun barrel, a fixing plate, a collecting pipe, a pipe plug, an air inlet pipe flange, a central air gun distribution connecting pipe, a central air gun distribution valve, a central air gun distribution joint, a three-way air inlet flange, a three-way pipe and the like, wherein the annular outer air gun is provided with 8 branch gun barrels, the spray head of the air gun is provided with fuel spray holes, 1 spray hole sprays fuel spray into an axial included angle in a fire pan, the fuel spray is first-stage fuel, and the rest 2 spray holes spray fuel spray into the fuel spray in the flame direction at radial inclined angles and axial included angles, and the fuel spray is second-stage fuel.

As a preferred implementation mode of this application technical scheme, central air gun is as reserve air gun, is equipped with the control valve on it, and fuel gas is introduced from the annular outer air gun three-way pipe of piece, and when furnace low temperature operation or fuel calorific value were higher, open a central air gun, adjustment burning situation, central air gun includes the barrel, barrel front end fixed mounting has central shower nozzle, the barrel is the S type wholly, is provided with the second mounting flange before the bending position, the barrel tail end is provided with the gas joint.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model adopts the combined design means of uniformly distributing air of the main air deflector, slanting fuel perforation on the fire pan brick, ring groove on the inner wall of the fire pan and slanting fuel spray hole of the outer air gun spray head, realizes the purposes of grading fuel, air flow equalization, rapid and uniform mixing of fuel gas and air and sectional combustion, achieves the use effects of stable flame, double low emission of CO and NOx, and the design of the gas control valve of the configured central air gun, ensures that when the working condition of the low-temperature hearth is carried out, the central air gun is put into use by opening the control valve, and the burner meets the ultra-low emission requirement of the NOx of the low-temperature hearth, and meets the use effects of environmental protection emission and energy conservation.

The burner is fine in treatment, better solves the problem of uniform mixing of fuel gas and air, can well adapt to the requirements of double low emission of CO and NOx of a high-temperature hearth and a low-temperature hearth, has the characteristics of adjustment ratio, simplicity in operation and convenience in maintenance, and is an ultralow nitrogen gas burner with double low emission of CO and NOx.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of the overall structure of an ultralow nitrogen burner with double low CO and NOx emissions;

FIG. 2 is a top view of an ultra-low nitrogen burner with dual low CO and NOx emissions in accordance with the present utility model;

FIG. 3 is a schematic diagram of the fire pan brick structure of the ultralow nitrogen gas burner with double low CO and NOx emissions;

FIG. 4 is a cross-sectional view of an ultra-low nitrogen gas burner body with dual low CO and NOx emissions in accordance with the present utility model;

FIG. 5 is a side cross-sectional view of an ultra-low nitrogen gas burner body with dual low CO and NOx emissions in accordance with the present utility model;

FIG. 6 is a bottom view of an ultra-low nitrogen gas burner body with dual low CO and NOx emissions in accordance with the present utility model;

FIG. 7 is a schematic diagram of an external air gun structure of an ultralow nitrogen burner with double low CO and NOx emissions;

FIG. 8 is a top plan view of an outer air gun of an ultralow nitrogen burner with dual low CO and NOx emissions in accordance with the present utility model;

FIG. 9 is a schematic view of the included angle of an ultralow nitrogen burner with double low CO and NOx emissions according to the present utility model;

FIG. 10 is a schematic diagram of a central air gun structure of an ultralow nitrogen gas burner with double low CO and NOx emissions.

In the figure: 1. fire basin bricks; 2. a main body; 3. a pilot lamp; 4. an annular outer air gun; 5. a central air gun; 6. an air regulating valve; 7. a three-way pipe; 10. a fluid flame path section; 11. a tube groove; 12. perforating fuel; 13. a ring groove; 21. A bottom plate; 22. a pilot lamp sleeve; 23. a partition plate; 24. an outer cylinder; 25. a ceramic fiber liner; 26. a steel plate mesh; 27. a central sleeve; 28. a first mounting flange; 29. fixing the brick sleeve; 210. a fire basin seat plate; 211. a center sleeve is supported; 212. a flame stabilizing disc; 213. a liner ring; 214. an annular outer air gun sleeve; 215. cross groove screws; 216. an air deflector; 217. a viewing hole; 218. a high-strength bolt; 219. a fire detection hole; 220. an ignition hole; 41. a spray head; 42. connecting sleeves; 43. a barrel; 44. a fixing plate; 45. a collecting pipe; 46. plugging a pipe; 47. an air inlet pipe; 48. a branch air inlet pipe flange; 49. a central air gun dispensing nozzle; 410. a central air gun dispensing valve; 411. a central air gun dispensing fitting; 412. a three-way air inlet flange; 413. a three-way pipe; 51. a central spray head; 52. a barrel; 53. a second mounting flange; 54. and a gas joint.

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.

Example 1

As shown in fig. 1-10, the present utility model provides a technical solution: the utility model provides an ultralow nitrogen gas burner of two low emissions of CO, NOx, includes main part 2, and main part 2 upper end outside fixed mounting has round fire pot brick 1, is provided with the pilot lamp 3 near the main part 2 inner wall, and main part 2 middle part periphery round is provided with annular outer air gun 4, is provided with central air gun 5 in the middle of the inside of main part 2, is provided with air regulating valve 6 in the lower part of main part 2, and central air gun 5 and annular outer air gun 4 pass through the union coupling, are provided with three-way pipe 7 in the middle of the pipe.

In a specific embodiment of the utility model, primary fuel gas is sprayed into the fire pan through the annular outer air gun 4 at an axial included angle, so that the fuel gas of the independent annular outer air gun 4 is graded, the fuel gas and air are mixed in radial and axial directions, after being ignited by the pilot lamp 3, flue gas is sprayed out from flue gas small holes arranged on the side surface and the front end of the fire pan brick 1, secondary fuel gas sprayed out of the fire pan of the annular outer air gun 4 is ignited, the internal and external height difference of the graded fuel gas is ignited, the sectional combustion of the fuel gas is realized, the specific combustion flame shape is organized, and a flame body with more balanced temperature field distribution is formed; the air flow equalization is realized by the special design of the air deflector 216, and the air flow equalization and the gas form cross vector impact, so that the mixing is more uniform; the change of the section of the ring groove 13 on the inner wall of the fire pot brings about the pressure drop change of a gas diffusion area, so that the gas diffusion is more refined and uniform, a rigid and stable columnar flame is formed, the surface temperature of the flame is balanced, the generation of CO and the generation of thermal NOx are effectively inhibited, and the double low emission of CO and NOx is realized.

In the technical scheme, the arrangement of the ring groove 13 in the fire pan brings about the change of the mixing pressure of the combustion air, the fuel gas and the flue gas on the flow passage, and the uniform and rapid mixing of the fuel gas and the air is enhanced; the arrangement of the fuel perforation 12 is beneficial to the first-stage gas introduction of the annular outer air gun 4 in a grading way; the arrangement of the horizontal and vertical smoke holes is beneficial to the ignition and the sectional combustion of the secondary fuel gas of the annular outer air gun 4.

Referring to fig. 2 in some technical schemes, 8 pipe slots 11 are arranged at the lower end of the outer diameter of the fire pan brick 1, the upper end of the outer diameter is a frustum, the lower part of the conical side is provided with 8 inward axial fuel perforations 12 corresponding to the positions of the pipe slots 11, the upper end of the frustum is provided with a convex edge inwards, a ring slot 13 is arranged at the turning position of the convex edge in the fire pan, the ring slot 13 is provided with a horizontal hole n-d14 and a vertical hole n-d15 smoke vent, the side surface and the upper surface of the cone are directly reached, and the fuel perforations 12 lead to the ring slot 13.

In the technical scheme, the peripheral arrangement of the air gun shortens the working length of the annular outer air gun 4, so that the annular outer air gun 4 is more convenient to disassemble and the installation position is more accurate; the arrangement of the air deflector 216 reduces the drift of the combustion air, avoids the uneven flame length caused by the drift of the combustion air, is beneficial to stabilizing the flame, balancing the surface temperature of the flame and inhibiting the generation of thermal NOx.

In some embodiments, referring to fig. 3, an annular outer air gun sleeve 214 of a component of the main body 2 is arranged at the periphery of the outer barrel 24, an air deflector 216 is arranged inside the main body, the main body 2 is supported by other components, and when assembled, the annular outer air gun 4 is inserted and mounted from the first mounting flange 28, and other components are inserted and mounted from the bottom plate 21.

In the technical scheme, the sprayed primary fuel is quickly and uniformly mixed with air in the fire pot in the radial direction and the axial direction, and after being ignited by the pilot burner 3, primary flame smoke is sprayed from small holes arranged on the side surface and the front end of the fire pot brick 1 to ignite secondary fuel gas sprayed outside the fire pot of the annular outer air gun 4. The independent annular outer air gun 4 realizes the classification of fuel gas, is combined with a fire pot, and the classified fuel gas is ignited by the internal and external height difference, so that the sectional combustion of the fuel gas is realized, the specific combustion flame shape is organized, the flame body with more balanced temperature field distribution is formed, meanwhile, the swirling flow of primary fuel is realized, the fuel and the air are more fully mixed in the radial direction and the axial direction, the combustion is more complete, and the purposes of double low emission of CO and NOx and energy conservation are achieved.

In some technical solutions, referring to fig. 4, 3 fuel spray holes are provided on the upper nozzle 41 of the annular outer air gun 4, wherein 1 spray hole sprays fuel spray into the fire pan at an axial included angle delta, which is the first stage fuel, and the other 2 spray holes spray fuel spray into the flame direction at radial inclined angles and axial included angles alpha and beta, which are the second stage fuel

In the technical scheme, the integration of a plurality of innovation points is realized, the design thought of fuel classification, air flow equalization, rapid and uniform mixing of fuel gas and air, sectional combustion, flame stabilization and double low emission of CO and NOx is realized by the burner, when the central air gun 5 is started, the environment-friendly emission and energy-saving use requirements at the low-temperature hearth temperature are met, and the burner has the characteristics of wide regulation ratio, double low emission of CO and NOx, simplicity in operation and convenience in maintenance.

In some technical solutions, referring to fig. 4, the main purpose of the central air gun 5 is to provide a gas control valve for introducing gas from the damper 6, and when the furnace is in low temperature operation or the heat value of the fuel is high, the central air gun 5 is opened to adjust the combustion condition.

Working principle: during operation, on one hand, combustion air is blocked by the air regulating valve 6 and enters the inner cavity of the main body 2 through the air guide plate 216, the combustion air is rapidly and shunted and diffused from the upper end and the lower end of the air guide plate 216 and uniformly fills the combined fluid flame path section 10 of the main body 2 and the flame pan inner cavity, on the other hand, fuel gas enters the collecting pipe of the annular outer air gun 4 from the fuel pipeline interface, enters the 8 branch gun pipes 43 uniformly distributed in the annular outer air gun 4, is sprayed out from the 3 spray holes of the outer air gun spray head 41, and part of the fuel gas is sprayed into the flame pan through the flame pan inclined fuel perforation 12, so that primary fuel gas is generated, air in the fluid flame path section 10 is rapidly and uniformly mixed, and flames of the long-term flame lamps 3 are ignited to form primary flames; a part of fuel is formed into radial inclination angle and axial included angle, and fuel jet is sprayed in the flame direction, so that the fuel is secondary fuel gas. The primary flue gas sprayed from the horizontal and vertical small holes on the side surface and the upper end of the fire pan ignites the secondary fuel gas, thereby realizing the purposes of fuel gas grading and sectional combustion, organizing a specific combustion flame shape and forming a flame body with more balanced temperature field distribution. The arrangement of the air deflector 216 reduces the drift of the combustion air, avoids the uneven flame length caused by the drift of the combustion air, is beneficial to stabilizing the flame, balancing the surface temperature of the flame and inhibiting the generation of CO and thermal NOx. The effects of low emission of CO and NOx and energy saving are achieved.

The fuel gas is classified by utilizing the distribution of the spray holes of the annular outer air gun 4, and the primary fuel gas is rapidly and uniformly diffused in the fire pan by utilizing the kinetic energy of fuel gas injection and the injection angle; by the special design of the air deflector 216, the air flow equalization is realized, and the air flow equalization and the primary fuel gas which is rapidly and uniformly diffused form the angle vector momentum impact, so that the mixing is more uniform; the arrangement of the fuel perforation 12 of the fire pot brick 1 is matched with the primary gas spray hole of the annular outer air gun 4, so that the classification of the gas of the independent annular outer air gun 4 is realized; the pressure drop change of the primary gas diffusion area is brought by the change of the cross section of the ring groove 13 on the inner wall of the fire pot, and the diffusion of the primary gas is more refined and uniform; the fire basin brick 1 is provided with a plurality of horizontal and vertical small holes, so that the ignition and stable fire of secondary fuel gas are ensured.

When the central air gun 5 is started, the distribution proportion of primary fuel gas in the fire pan can be increased, and the burner can be well adapted to low-temperature hearth smoke.

The combined design of fuel classification, fuel inclined perforation and combustion-supporting air bias flow prevention realizes the purposes of rapid and uniform mixing and sectional combustion of fuel and air in radial and axial directions by a fine treatment means, and achieves the use effects of stable flame, low emission of CO and NOx.

The embodiments of the present utility model are merely described in terms of preferred embodiments of the present utility model, and are not intended to limit the spirit and scope of the present utility model, such as pilot lamps, wind-adjusting butterfly valves, flame holders, fire detectors, etc., but various modifications, combinations and improvements of the technical solutions of the present utility model will fall within the scope of the present utility model by those skilled in the art without departing from the design concept of the present utility model, and the technical content of the present utility model is fully described in the claims.

Claims

1. The utility model provides a CO, ultralow nitrogen gas combustor of NOx double low emission, includes main part (2), its characterized in that: the fire pot is characterized in that a circle of fire pot bricks (1) is fixedly arranged on the periphery of the upper portion of the main body (2), a pilot lamp (3) is arranged near the inner wall of the main body (2) in a bolt fastening mode, an annular outer air gun (4) is arranged outside the middle of the main body (2), a central air gun (5) is arranged in the middle of the inner portion of the main body (2) in a bolt fastening mode, an air regulating valve (6) is fixedly arranged on the lower portion of the main body (2), the central air gun (5) is connected with the annular outer air gun (4) through a metal hose, and a three-way pipe (7) is arranged in the middle of the metal hose.

2. An ultra-low nitrogen gas burner with CO and NOx dual low emissions as defined in claim 1, wherein: the fire basin brick is characterized in that 8 pipe grooves (11) are formed in the lower end of the outer diameter of the fire basin brick (1), the upper end of the outer diameter is a frustum, 8 inward axial fuel perforations (12) are formed in the position, corresponding to the pipe grooves (11), of the lower portion of the conical side, convex edges are arranged inwards on the upper end of the frustum, annular grooves (13) are formed in the turning positions of the convex edges in the fire basin, the annular grooves (13) are provided with horizontal holes n-d (14) and vertical holes n-d (15), the horizontal holes directly reach the conical side surfaces, the vertical holes directly reach the upper surfaces, and the fuel perforations (12) are led to the annular grooves (13).

3. An ultra-low nitrogen gas burner with CO and NOx dual low emissions as defined in claim 1, wherein: the main part (2) includes urceolus (24), urceolus (24) bottom is provided with bottom plate (21), bottom plate (21) department is provided with pilot lamp sleeve pipe (22), center sleeve pipe (27), main part (2) inside is provided with ceramic fiber inside lining (25) and steel sheet net (26), be provided with baffle (23) on bottom plate (21), urceolus (24) upper portion is provided with first mounting flange (28), first mounting flange (28) are fixed annular outer air gun sleeve pipe (214) on urceolus (24), outer air gun sleeve pipe (214) are outer to be fixed with through cross groove screw fixation and are solid brick cover (29), be provided with fire pot bedplate (210) in outer air gun sleeve pipe (214), be provided with center sleeve support (211) on fire pot bedplate (210), be provided with lining (213) on fire pot bedplate (210), center sleeve pipe (27) top still is provided with steady flame dish (212).

4. An ultra-low nitrogen burner with double low emission of CO and NOx according to claim 1, characterized in that said annular outer air gun (4) comprises a nozzle (41), said nozzle (41) being provided with 3 fuel injection holes, one of which has an axial angle δ, the other two injection holes being radially inclined and axially inclined α and β externally of the burner.

5. The ultra-low nitrogen burner with double low emission of CO and NOx according to claim 1, wherein the central air gun (5) comprises a gun barrel (52), a central spray head (51) is fixedly arranged at the front end of the gun barrel, the gun barrel (52) is integrally S-shaped, a second mounting flange (53) is arranged in front of a bending position, and a gas joint (54) is arranged at the tail end of the gun barrel (52).