A low nitrogen burner for preheating furnace of acetylene device

Abstract

The present invention relates to a low-nitrogen burner for a preheating furnace of an acetylene device, comprising a burner body, a burner brick and an air gun assembly installed on the burner body, a combustion-supporting hole is provided on the side wall of the burner brick near the top; the air gun assembly comprises an inner ring gun and an outer ring gun, the inner ring gun and the outer ring gun are respectively located on the inner and outer sides of the burner brick and arranged one by one, a main hole and a secondary hole are provided on the outer ring gun nozzle of the outer ring gun, the main hole is parallel to the inclined surface of the outer wall of the burner brick, the angle between the main hole and the axis of the outer ring gun is a1, and the angle between the secondary hole and the axis of the outer ring gun is a2, a1<a2; a vertical spray hole and an inclined spray hole inclined toward the burner brick are provided on the inner ring gun nozzle of the inner ring gun; in a group of outer ring guns and inner ring guns arranged correspondingly, the main hole, the vertical spray hole and the inclined spray hole are located on the same plane. The present invention can meet environmental protection standards and can also effectively solve combustion instability phenomena such as combustion deignition.

Description

Technical Field

[0001] The invention relates to the technical field related to environmental waste gas treatment, and in particular to a low-nitrogen burner for a preheating furnace of an acetylene device. Background Art

[0002] At present, the preheating furnace bottom burner of the natural gas partial oxidation acetylene unit still uses a single air gun burner, that is, the fuel gas is sprayed into the furnace through a single central gun for combustion. Although the original burner can meet the process requirements of the preheating furnace, it cannot meet the emission requirements of flue gas nitrogen oxides by the environmental protection department. According to GB 31571-2015 Petrochemical Industry Pollutant Emission Standard, the emission limit of nitrogen oxides is 150mg / Nm 3 According to the on-site flue gas detection of the device, the nitrogen oxides in the flue gas discharged from the chimney of the preheating furnace generally exceed the standard. Therefore, it is urgent to carry out low-nitrogen transformation of the preheating furnace and replace the low-nitrogen burner.

[0003] Later, during the technical transformation process, it was discovered that the conventional low-nitrogen burner structure is not suitable for acetylene preheating furnaces, mainly manifested in the two aspects of insufficient heat load and unstable combustion. After market research, it was found that conventional low-nitrogen burners are generally used in combination on heating furnaces with large furnaces, that is, a heating furnace is equipped with multiple burners. Therefore, when the furnace is working, multiple burners can affect each other, the combustion is more stable, and the anti-interference performance of a single burner is relatively good. The furnace of the acetylene preheating furnace is relatively small, and only one burner can be set in the center of the furnace bottom, which puts higher requirements on the combustion stability of the burner. Because the low-nitrogen combustion principle determines that the low-nitrogen burner has poor combustion stability and anti-interference performance compared to the traditional single air gun burner, and because only one burner can be set at the bottom of the preheating furnace, the conventional low-nitrogen burner cannot adapt to the working conditions of the acetylene preheating furnace. Summary of the invention

[0004] The present invention aims to solve two technical problems: first, to achieve low-nitrogen combustion and meet the flue gas emission standards; second, to match the burner with the acetylene preheating furnace so that combustion instability phenomena such as deignition and flashback do not occur.

[0005] The technical solution of the present invention for solving the above-mentioned technical problems is as follows: a low-nitrogen burner for a preheating furnace of an acetylene device comprises a burner body and a burner brick and an air gun assembly installed on the burner body, a combustion-supporting hole is provided on the side wall of the burner brick near the top; the air gun assembly comprises an inner ring gun and an outer ring gun, the inner ring gun and the outer ring gun are respectively located on the inner and outer sides of the burner brick and are arranged one by one, a main hole and a secondary hole are provided on the outer ring gun nozzle of the outer ring gun, the main hole is parallel to the inclined surface of the outer side wall of the burner brick, the angle between the main hole and the axis of the outer ring gun is a1, and the angle between the secondary hole and the axis of the outer ring gun is a2, a1<a2; a vertical spray hole and an inclined spray hole inclined toward the burner brick are provided on the inner ring gun nozzle of the inner ring gun; in a group of outer ring guns and inner ring guns arranged correspondingly, the main hole, the vertical spray hole and the inclined spray hole are located on the same plane.

[0006] The beneficial effects of the present invention are: different from the traditional single air gun burner, the present invention has several air guns arranged on the periphery of the burner brick, which can realize the low-nitrogen combustion technology of fuel grading and flue gas internal circulation, greatly reducing the concentration of nitrogen oxides in the flue gas, meeting environmental protection standards, and also effectively solving the combustion instability phenomena such as combustion deignition.

[0007] The fuel gas sprayed from the spray hole of the inner ring gun of the present invention is directly sprayed to the inner edge of the top of the burner brick. The inner edge of the top is provided with a combustion-supporting hole, which makes it easy for the flame of the inner ring gun to burn the top of the burner brick through, and the temperature of the top of the burner brick is greatly increased. At the same time, part of the fresh air will mix with the fuel gas sprayed from the outer ring gun through the combustion-supporting holes on the burner brick. The structural matching of the inner ring gun and the combustion-supporting holes of the burner brick helps to stabilize the flame of the outer ring gun. This is mainly because the injection angle of the auxiliary hole of the outer ring gun is along the outer edge of the top of the burner brick, that is, part of the fuel gas is directly sprayed onto the end of the burner brick. Since the temperature of the end is very high, the fuel gas sprayed onto the end is directly ignited, which avoids the burner from de-igniting and unstable combustion during the process of increasing the load of the preheating furnace.

[0008] The injection angle of the main hole of the outer ring gun of the present invention directly affects the shape of the flame in the furnace. The injection angle of the outer ring gun of a conventional low-nitrogen burner is relatively small, which easily causes the flame to lick the furnace tube and is not suitable for a small furnace structure such as a preheating furnace. If the angle is too large, the internal circulation efficiency of the flue gas is greatly reduced, resulting in a reduction in the low-nitrogen combustion effect and failure to meet environmental protection standards. Keeping the injection direction of the main hole of the outer ring gun parallel to the inclined surface of the burner brick can greatly improve the internal circulation efficiency of the flue gas on the one hand, and on the other hand, make the flame strong, powerful, compact and non-divergent, avoiding the phenomenon of flame licking the furnace tube.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the angle a1 between the main hole and the axis of the outer ring gun is 10° to 15°, and the angle a2 between the secondary hole and the axis of the outer ring gun is 15° to 30°.

[0011] The beneficial effect of adopting the above further scheme is: setting the injection angle of the main hole of the outer ring gun to 10-15°, and keeping the injection direction parallel to the inclined surface of the burner brick, further improving the efficiency of the internal circulation of the flue gas, and making the flame strong, compact and not divergent, avoiding the occurrence of flame licking the furnace tube.

[0012] Furthermore, there are two auxiliary holes, which are symmetrically arranged on one side of the main hole close to the burner brick; the diameter of the main hole is 4-8 mm, and the diameter of the auxiliary hole is 2-4 mm.

[0013] Furthermore, the included angle b between the vertical spray hole and the inclined spray hole is 10° to 30°; the vertical spray hole and the inclined spray hole have the same aperture, which is 1.5 to 3 mm.

[0014] Furthermore, the air gun assembly also includes a center gun, which is located at the center of the burner brick. A plurality of center spray holes are arranged on the center gun nozzle of the center gun, and the plurality of center spray holes are arranged obliquely toward the burner brick respectively.

[0015] Furthermore, the angle c0 between the central spray hole and the axis of the central gun is 30° to 50°; the number of the central spray holes is 6 or 8, and the hole diameter is 1.5 to 3 mm.

[0016] Furthermore, a vertical hole and a horizontal hole are provided on the top of the burner brick, the horizontal hole is arranged through the side wall of the burner brick, and the vertical hole communicates with the horizontal hole and the end face of the burner brick.

[0017] The beneficial effect of adopting the above-mentioned further scheme is that the fuel gas ejected from the spray hole of the inner ring gun is directly sprayed to the inner edge of the top of the burner brick. The inner edge of the top of the burner brick is provided with small holes in the vertical and horizontal directions. This makes it easy for the flame of the inner ring gun to penetrate the inner and outer walls of the burner brick and burn the top of the burner brick through. The temperature of the top of the burner brick is greatly increased. At the same time, part of the fresh air will mix with the fuel gas ejected from the outer ring gun through the vertical and horizontal holes on the burner brick. The structural matching of the inner ring gun and the combustion-supporting holes of the burner brick is more conducive to stabilizing the flame of the outer ring gun.

[0018] Furthermore, there are multiple air gun assemblies, the vertical holes and the horizontal holes are multiple groups, and each air gun assembly is arranged corresponding to a group of the vertical holes and the horizontal holes. The number of groups of vertical holes and horizontal holes is greater than the number of air gun assemblies.

[0019] Furthermore, the burner brick comprises a plurality of refractory bricks, and the plurality of refractory bricks are spliced ​​along the circumference to form the burner brick. The inclination angle d of the outer wall slope of the refractory brick is 10° to 15°, and the height H of the outer wall slope is between 150 and 250 mm.

[0020] Furthermore, a first flame detection pipe and a second flame detection pipe are arranged at 90° along the circumference on the side wall of the burner body, a permanent lamp is arranged in the burner body, the axis of the first flame detection pipe, the axis of the permanent lamp and the central gun axis of the air gun assembly are all located on the same plane, and the axis of the second flame detection pipe and the central gun axis of the air gun assembly are located on the same plane;

[0021] And / or, the ever-burning lamp includes a gun barrel and an ignition needle, the ignition needle is arranged side by side with the gun barrel and is detachably connected to the gun barrel, one end of the gun barrel is provided with a gun head, and the other end is provided with an air inlet nozzle; a mixing chamber is provided on the gun barrel near the air inlet nozzle, an air hole is opened on the mixing chamber, and an air regulating mechanism cooperating with the air hole is provided on the gun barrel near the air inlet nozzle.

[0022] The beneficial effect of adopting the above further scheme is that the burner is provided with two fire detection interfaces, one of which is arranged in the same plane as the center gun and the eternal lamp, and the other is arranged in the same plane as the center gun. Such a structural design can realize that after the eternal lamp is ignited and before the main fuel gas is added, one of the fire detection tubes can detect the flame of the eternal lamp, and after the main fuel gas is added, the two fire detection tubes can detect the flame of the center gun at the same time. The two fire detection tubes are set at an angle of 90°, and even if the flame fluctuates, the fire detection can detect the signal in time to avoid device interlocking. The reasonable setting of the fire detection position greatly improves the safety of the preheating furnace operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic cross-sectional structure diagram of a low nitrogen burner of a preheating furnace of an acetylene device of the present invention;

[0024] Figure 2 It is a schematic diagram of the top view of the low nitrogen burner of the preheating furnace of the acetylene device of the present invention;

[0025] Figure 3a A top view of a partial structure of a burner brick of the present invention;

[0026] Figure 3b It is a schematic diagram of the cross-sectional structure of the vertical hole and the horizontal hole;

[0027] Figure 4a It is a schematic diagram of the top view of the outer ring gun nozzle;

[0028] Figure 4b It is a schematic diagram of the cross-sectional structure of the outer ring gun nozzle;

[0029] Figure 5a It is a schematic diagram of the top view of the inner ring gun nozzle;

[0030] Figure 5b It is a schematic diagram of the cross-sectional structure of the inner ring gun nozzle;

[0031] Figure 6a Schematic diagram of the top view of the center gun nozzle;

[0032] Figure 6b Schematic diagram of the cross-sectional structure of the center gun nozzle;

[0033] Figure 7 It is a schematic diagram of the main structure of the air gun assembly;

[0034] Figure 8 This is a schematic diagram of the main structure of the flame-adjustable ever-burning lamp of the present invention;

[0035] Fig. 9 for Figure 8 The enlarged structural diagram of the middle A part;

[0036] Fig.10 Schematic diagram of the cross-sectional structure of the gun head;

[0037] Fig.11 The top view of the gun head is a schematic diagram;

[0038] Fig.12 This is a schematic diagram of the main structure of another embodiment of the flame-adjustable ever-burning lamp of the present invention.

[0039] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0040] 1. Burner brick; 2. Burner shell; 3. Air gun assembly; 4. Ever-burning lamp; 5. Silence cotton; 6. Air adjustment mechanism; 7. Insulation cotton; 8. Preheating furnace bottom casting material; 9. Preheating furnace bottom plate;

[0041] 1-2, outer wall slope; 1-3, vertical hole; 1-4, horizontal hole;

[0042] 2-1, the first fire inspection takes over; 2-2, the second fire inspection takes over;

[0043] 3-1, outer ring gun; 3-2, inner ring gun; 3-3, center gun;

[0044] 3-1-1, outer ring gun nozzle; 3-1-2, main hole; 3-1-3, auxiliary hole;

[0045] 3-2-1, inner ring gun nozzle; 3-2-2, vertical spray hole; 3-2-3, inclined spray hole;

[0046] 3-3-1. Center gun nozzle; 3-3-2. Center spray hole.

[0047] 41. Gun barrel; 411. Air inlet nozzle; 412. Mixing chamber; 413. Air adjustment ring; 414. Air adjustment sleeve; 42. Ignition needle; 43. Gun head; 431. First oblique spray hole; 432. Second oblique spray hole; 433. Horizontal hole; 44. Mounting flange; 45. Sleeve; 46. Ignition needle fixing piece; 461. Bolt. DETAILED DESCRIPTION

[0048] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0049] Example 1

[0050] like Figure 1-Figure 7 As shown, a low-nitrogen burner for a preheating furnace of an acetylene device in this embodiment comprises a burner body, a burner brick 1 and an air gun assembly mounted on the burner body, wherein a combustion-supporting hole is provided on the side wall of the burner brick 1 near the top; the air gun assembly comprises an inner ring gun 3-2 and an outer ring gun 3-1, wherein the inner ring gun 3-2 and the outer ring gun 3-1 are respectively located on the inner and outer sides of the burner brick 1 and are arranged one-to-one, and a main hole 3-1-2 and a secondary hole 3-1-3 are provided on the outer ring gun nozzle 3-1-1 of the outer ring gun 3-1, wherein the main hole 3-1-2 is parallel to the inclined surface 1-2 of the outer wall of the burner brick 1, and the main hole 3-1-2 The angle between the secondary hole 3-1-3 and the axis of the outer ring gun 3-1 is a1, and the angle between the secondary hole 3-1-3 and the axis of the outer ring gun 3-1 is a2, a1<a2; the inner ring gun nozzle 3-2-1 of the inner ring gun 3-2 is provided with a vertical spray hole 3-2-2 and an inclined spray hole 3-2-3 inclined toward the burner brick 1; in a corresponding group of outer ring guns 3-1 and inner ring guns 3-2, the main hole 3-1-2, the vertical spray hole 3-2-2 and the inclined spray hole 3-2-3 are located on the same plane.

[0051] Among them, an optional solution of this embodiment is that the inner ring gun 3-2 can adopt an L-shaped structure, one end of which is connected to the outer ring gun 3-1, and the burner brick 1 is located between the vertical section of the inner ring gun 3-2 and the outer ring gun 3-1. The number of outer ring guns 3-1 and inner ring guns 3-2 can be 4 to 8 respectively.

[0052] In this embodiment, the fuel gas ejected from the spray hole of the inner ring gun is directly sprayed to the inner edge of the top of the burner brick. The inner edge of the top is provided with a combustion-supporting hole, which makes it easy for the flame of the inner ring gun to burn the top of the burner brick through, and the temperature of the top of the burner brick is greatly increased. At the same time, part of the fresh air will mix with the fuel gas ejected from the outer ring gun through the combustion-supporting holes on the burner brick. The structural matching of the inner ring gun and the combustion-supporting holes of the burner brick helps to stabilize the flame of the outer ring gun. This is mainly because the injection angle of the auxiliary hole of the outer ring gun is along the outer edge of the top of the burner brick, that is, part of the fuel gas is directly sprayed onto the end of the burner brick. Since the temperature of the end is very high, the fuel gas sprayed onto the end is directly ignited, which avoids the burner from de-igniting and unstable combustion during the process of increasing the load of the preheating furnace.

[0053] The injection angle of the main hole of the outer ring gun in this embodiment directly affects the shape of the flame in the furnace. The injection angle of the outer ring gun of a conventional low-nitrogen burner is relatively small, which easily causes the flame to lick the furnace tube and is not suitable for a small furnace structure such as a preheating furnace. If the angle is too large, the efficiency of the internal circulation of the flue gas is greatly reduced, resulting in a reduction in the low-nitrogen combustion effect and failure to meet environmental protection standards. Keeping the injection direction of the main hole of the outer ring gun parallel to the inclined surface of the burner brick can greatly improve the efficiency of the internal circulation of the flue gas on the one hand, and on the other hand, make the flame strong, powerful, compact and non-divergent, avoiding the phenomenon of flame licking the furnace tube.

[0054] Example 2

[0055] like Figure 1-Figure 7 As shown, a low-nitrogen burner for a preheating furnace of an acetylene device in this embodiment comprises a burner body, a burner brick 1 and an air gun assembly mounted on the burner body, wherein a combustion-supporting hole is provided on the side wall of the burner brick 1 near the top; the air gun assembly comprises an inner ring gun 3-2 and an outer ring gun 3-1, wherein the inner ring gun 3-2 and the outer ring gun 3-1 are respectively located on the inner and outer sides of the burner brick 1 and are arranged one-to-one, and a main hole 3-1-2 and a secondary hole 3-1-3 are provided on the outer ring gun nozzle 3-1-1 of the outer ring gun 3-1, wherein the main hole 3-1-2 is parallel to the inclined surface 1-2 of the outer wall of the burner brick 1, and the main hole 3-1-2 The angle between the secondary hole 3-1-3 and the axis of the outer ring gun 3-1 is a1, and the angle between the secondary hole 3-1-3 and the axis of the outer ring gun 3-1 is a2, a1<a2; the inner ring gun nozzle 3-2-1 of the inner ring gun 3-2 is provided with a vertical spray hole 3-2-2 and an inclined spray hole 3-2-3 inclined toward the burner brick 1; in a corresponding group of outer ring guns 3-1 and inner ring guns 3-2, the main hole 3-1-2, the vertical spray hole 3-2-2 and the inclined spray hole 3-2-3 are located on the same plane.

[0056] Among them, an optional solution of this embodiment is that the inner ring gun 3-2 can adopt an L-shaped structure, one end of which is connected to the outer ring gun 3-1, and the burner brick 1 is located between the vertical section of the inner ring gun 3-2 and the outer ring gun 3-1. The number of outer ring guns 3-1 and inner ring guns 3-2 can be 4 to 8 respectively.

[0057] In this embodiment, the fuel gas ejected from the spray hole of the inner ring gun is directly sprayed to the inner edge of the top of the burner brick. The inner edge of the top is provided with a combustion-supporting hole, which makes it easy for the flame of the inner ring gun to burn the top of the burner brick through, and the temperature of the top of the burner brick is greatly increased. At the same time, part of the fresh air will mix with the fuel gas ejected from the outer ring gun through the combustion-supporting holes on the burner brick. The structural matching of the inner ring gun and the combustion-supporting holes of the burner brick helps to stabilize the flame of the outer ring gun. This is mainly because the injection angle of the auxiliary hole of the outer ring gun is along the outer edge of the top of the burner brick, that is, part of the fuel gas is directly sprayed onto the end of the burner brick. Since the temperature of the end is very high, the fuel gas sprayed onto the end is directly ignited, which avoids the burner from de-igniting and unstable combustion during the process of increasing the load of the preheating furnace.

[0058] The injection angle of the main hole of the outer ring gun in this embodiment directly affects the shape of the flame in the furnace. The injection angle of the outer ring gun of a conventional low-nitrogen burner is relatively small, which easily causes the flame to lick the furnace tube and is not suitable for a small furnace structure such as a preheating furnace. If the angle is too large, the efficiency of the internal circulation of the flue gas is greatly reduced, resulting in a reduction in the low-nitrogen combustion effect and failure to meet environmental protection standards. Keeping the injection direction of the main hole of the outer ring gun parallel to the inclined surface of the burner brick can greatly improve the efficiency of the internal circulation of the flue gas on the one hand, and on the other hand, make the flame strong, powerful, compact and non-divergent, avoiding the phenomenon of flame licking the furnace tube.

[0059] like Figure 4a and 4b As shown, the angle a1 between the main hole 3-1-2 and the axis of the outer ring gun 3-1 in this embodiment is 10° to 15°, and the angle a2 between the secondary hole 3-1-3 and the axis of the outer ring gun 3-1 is 15° to 30°. The injection angle of the main hole of the outer ring gun is set to 10 to 15°, and the injection direction is kept parallel to the inclined surface of the burner brick, which further improves the efficiency of the internal circulation of the flue gas, and also makes the flame strong, compact and non-divergent, avoiding the phenomenon of flame licking the furnace tube.

[0060] In this embodiment, the diameter of the main hole 3-1-2 is 4-8 mm, and the diameter of the auxiliary hole 3-1-3 is 2-4 mm. There are two auxiliary holes 3-1-3, which are symmetrically arranged on one side of the main hole 3-1-2 close to the burner brick 1.

[0061] like Figure 5a and Figure 5bAs shown, the included angle b between the vertical spray hole 3-2-2 and the inclined spray hole 3-2-3 is 10° to 30°; the vertical spray hole 3-2-2 and the inclined spray hole 3-2-3 have the same aperture, which is 1.5 to 3 mm.

[0062] like Figure 1 , Figure 2 and Figure 7 As shown, the air gun assembly also includes a center gun 3-3, the center gun 3-3 is located at the center of the burner brick 1, and a plurality of center spray holes 3-3-2 are arranged on the center gun nozzle 3-3-1 of the center gun 3-3, and the plurality of center spray holes 3-3-2 are arranged obliquely toward the burner brick 1. The plurality of center spray holes 3-3-2 are arranged one by one corresponding to the oblique spray holes 3-2-3 on the inner ring gun 3-2. The number of the center spray holes 3-3-2 is 6 or 8, and the aperture is between 1.5 and 3 mm.

[0063] like Figure 6a and 6b As shown, the included angle c0 between the central spray hole 3-3-2 and the axis of the central gun 3-3 is 30° to 50°. That is, the included angle c between the two symmetrically arranged central spray holes 3-3-2 is 60° to 100°, and c can be 70°, 80°, or 90°.

[0064] like Figure 1 , Figure 2 , Figure 3a and Figure 3b As shown, the top of the burner brick 1 is provided with vertical holes 1-3 and horizontal holes 1-4, the horizontal holes 1-4 are set through the side wall of the burner brick 1, and the vertical holes 1-3 connect the horizontal holes 1-4 with the end face of the burner brick 1. The fuel gas ejected from the inner ring gun spray hole is directly sprayed to the inner edge of the top of the burner brick. The inner edge of the top of the burner brick is provided with small holes in the vertical and horizontal directions, which makes it easy for the flame of the inner ring gun to penetrate the inner and outer walls of the burner brick and burn the top through, greatly increasing the temperature of the top of the burner brick. At the same time, part of the fresh air will mix with the fuel gas ejected from the outer ring gun through the vertical and horizontal holes on the burner brick. The structural matching of the inner ring gun and the combustion-supporting hole of the burner brick is more conducive to stabilizing the flame of the outer ring gun.

[0065] like Figure 1 , Figure 2 , Figure 3a , Figure 3b as well as Figure 7 As shown, there are multiple air gun assemblies, the vertical holes 1-3 and the horizontal holes 1-4 are respectively multiple groups, and each air gun assembly is arranged corresponding to a group of vertical holes 1-3 and horizontal holes 1-4. The number of groups of vertical holes 1-3 and horizontal holes 1-4 is greater than the number of air gun assemblies.

[0066] like Figure 1 and Figure 2 As shown, the burner brick 1 includes a plurality of refractory bricks, and the plurality of refractory bricks are spliced ​​along the circumference to form the burner brick 1. The inclination angle d of the outer wall slope 1-2 of the refractory brick is 10° to 15°, and the height H of the outer wall slope 1-2 is between 150 and 250 mm.

[0067] like Figure 1 and Figure 2 As shown, the side wall of the burner body is provided with a first fire detection pipe 2-1 and a second fire detection pipe 2-2 arranged at 90° along the circumference, and a permanent lamp 4 is provided in the burner body. The axis of the first fire detection pipe 2-1, the axis of the permanent lamp 4 and the axis of the central gun of the air gun assembly are all located on the same plane, and the axis of the second fire detection pipe 2-2 and the axis of the central gun of the air gun assembly are located on the same plane. The burner is provided with two fire detection interfaces, one of which is arranged in the same plane as the central gun and the permanent lamp, and the other is arranged in the same plane as the central gun. Such a structural design can realize that after the permanent lamp is ignited and before the main fuel gas is added, one of the fire detection pipes can detect the flame of the permanent lamp, and after the main fuel gas is added, the two fire detection pipes can detect the flame of the central gun at the same time. The two fire detection pipes are arranged at an angle of 90°, so that even if the flame fluctuates, the fire detection can detect the signal in time to avoid device interlocking. The reasonable setting of the fire detection position greatly improves the safety of the preheating furnace operation. The permanent lamp 4 of this embodiment can be selected from a conventional structure.

[0068] like Figure 1 and Figure 2 As shown, an optional scheme of the burner body is that it includes a burner shell 2, silencer cotton 5 and an air regulating mechanism 6. The air gun assembly and the burner brick 1 are respectively arranged in the burner shell 2, the air regulating mechanism 6 is connected to the inside of the burner shell 2, and the first fire detection pipe 2-1 and the second fire detection pipe 2-2 are respectively connected to the inside of the burner shell 2. The silencer cotton 5 is arranged on the inner wall of the burner shell 2, and the vertical section of the outer ring gun 3-1 of the air gun assembly is arranged in the silencer cotton 5. A preheating furnace bottom casting material 8 is provided on the bottom plate 9 of the acetylene device preheating furnace, and the burner body is installed in the acetylene device preheating furnace bottom casting material 8, and a heat insulation cotton 7 is provided between the burner body and the preheating furnace bottom casting material 8.

[0069] This embodiment is different from the traditional single air gun burner. Several air guns are arranged on the periphery of the burner brick, which can realize the low-nitrogen combustion technology of fuel grading and flue gas internal circulation, greatly reducing the concentration of nitrogen oxides in the flue gas, meeting environmental protection standards, and effectively solving combustion instability phenomena such as combustion deignition.

[0070] Example 3

[0071] On the basis of Example 1 or Example 2, the ever-burning lamp in the burner body can be a flame-adjustable ever-burning lamp, such as Figure 8-Figure 12 As shown, the ever-burning lamp specifically includes a gun barrel 41 and an ignition needle 42, the ignition needle 42 is arranged side by side with the gun barrel 41 and is detachably connected to the gun barrel 41, one end of the gun barrel 41 is provided with a gun head 43, and the other end is provided with an air inlet nozzle 411; the gun barrel 41 is provided with a mixing chamber 412 near the air inlet nozzle 411, and the mixing chamber 412 is provided with an air hole, and the gun barrel 41 is provided with an air regulating mechanism cooperating with the air hole near the air inlet nozzle 411.

[0072] The air adjustment structure can be implemented in three ways, as follows:

[0073] Implementation method 1: Figure 8 As shown, the air adjustment mechanism includes an air adjustment ring 413, and the air adjustment ring 413 is axially movable in the interval between the air inlet nozzle 411 and the mixing chamber 412, and a plurality of air holes are provided on the end surface of the mixing chamber 412 close to the air adjustment ring 413. By setting the air adjustment ring, the air adjustment ring can move along the axial direction of the gun barrel. When the air adjustment ring moves downward, the gap between the air adjustment ring and the mixing chamber becomes larger, and the air intake is more, and vice versa. Specifically, the air adjustment ring 413 can be threadedly connected to the gun barrel 41, and the air volume can be adjusted by rotating the air adjustment ring 413.

[0074] Implementation method 2: Fig.12 As shown, the air regulating mechanism includes an air regulating sleeve 414, which is axially movable and arranged on the side wall of the mixing chamber 412 and spaced apart from the side wall of the mixing chamber 412, and a plurality of air holes are provided on the side wall of the mixing chamber 412. The air holes can also be arranged on the side wall of the mixing chamber 412, and the air regulating sleeve 414 blocks a small number of air holes, or a small blocking area, so that more air is introduced, and vice versa. Specifically, the air regulating sleeve 414 can be threadedly connected to the mixing chamber 412, and the air volume can be adjusted by rotating the air regulating sleeve 414.

[0075] Implementation method three, reference Figure 8 and Fig.12 The air regulating mechanism includes an air regulating ring 413 and an air regulating sleeve. The air regulating sleeve is sleeved outside the mixing chamber 412 and spaced apart from the mixing chamber 412. The air regulating ring 413 is axially movable in the space between the air inlet nozzle 411 and the mixing chamber 412. One end of the air regulating sleeve is connected to the air regulating ring 13. The air hole is provided on the end surface of the mixing chamber 12 close to the air regulating ring 413 or / and on the side wall of the mixing chamber 412. The connection of the air regulating ring 413 can refer to Figure 8The air volume can be adjusted more flexibly by combining the air adjusting ring with the air adjusting sleeve. Specifically, the air adjusting ring 413 can be threadedly connected to the barrel 41, and the air volume can be adjusted by rotating the air adjusting ring 413.

[0076] The diameter of the air holes in the air regulating mechanism is φ4 mm to φ12 mm, and the number of the air holes is 4 to 16. By reasonably limiting the diameter and number of the air holes, the air inlet regulation is made more stable and reliable.

[0077] like Figure 8-Figure 12 As shown, the side wall of the gun head 43 of the gun barrel 41 of this embodiment is provided with a plurality of oblique spray holes near the gun head 43; the plurality of oblique spray holes are arranged in a plurality of circles along the axial direction of the gun barrel 41, and each circle of the oblique spray holes is arranged in a plurality of circles along the circumferential direction of the gun barrel 41; the gun head end surface of the gun barrel 41 is also provided with a plurality of horizontal holes 433, and each of the horizontal holes 433 penetrates a corresponding oblique spray hole. By providing the multi-angle oblique spray holes on the gun head, the flame combustion intensity is high, and the plurality of horizontal holes provided on the upper end surface of the gun head play a role in stabilizing combustion.

[0078] like Fig.10 As shown, the angle between each circle of the oblique spray holes and the axial direction of the gun barrel 41 is the same; along the direction close to the end face of the gun head 43, the angle between each circle of the oblique spray holes and the axial direction of the gun barrel 41 increases or decreases in sequence, further improving the flame combustion intensity.

[0079] like Fig.10 As shown, the angle between the oblique spray hole and the axial direction of the gun barrel 1 is 22.5° to 60°. An optional solution of this embodiment is as follows: Figure 1 As shown in FIG3 , the gun head 43 of this embodiment is provided with two circles of oblique spray holes, namely, a first oblique spray hole 431 and a second oblique spray hole 432. The angle between the two symmetrically arranged first oblique spray holes 431 is a, which may be 120°, and the angle between the two symmetrically arranged second oblique spray holes 432 is b, which may be 60°.

[0080] like Figure 8 As shown, the gun barrel 41 is welded to the mounting flange 44, and the ignition needle 42 is threadedly connected to the mounting flange 44; a sleeve 45 is threadedly connected to the mounting flange 44, and the sleeve 45 is arranged away from one end of the gun head 43, and the sleeve 45 is sleeved on the outside of the gun barrel 41 and one end of the ignition needle 42. The gun barrel is welded to the mounting flange, and the ignition needle is threadedly connected to the mounting flange, and can be disassembled and replaced as a whole. The sleeve is bolted to the mounting flange to protect the cable in the barrel and prevent leakage.

[0081] like Figure 8As shown, the gun barrel 41 is welded with a plurality of ignition needle fixings 46 arranged along its axial direction, and the ignition needle fixings 46 are provided with positioning holes and locking threaded holes. The ignition needle 42 is penetrated through the positioning holes on the plurality of ignition needle fixings 46, and is threadedly connected in the locking threaded holes by bolts 461 to tighten the ignition needle 42. The positioning holes and the locking threaded holes can be arranged vertically. The ignition needle fixings are welded to the barrel of the ever-burning lamp, and the ignition needle is then tightened and fixed to the barrel by bolts, which facilitates the disassembly of the ignition needle. The ever-burning lamp gun head is threadedly connected to the gun barrel, which is easier to disassemble and replace than welding.

[0082] The flame-adjustable ever-burning lamp of this embodiment has an air hole in the mixing chamber and an air-adjusting mechanism on the barrel. When the amount of fuel gas is constant, the amount of combustion-supporting air entering the mixing chamber can be adjusted by the air-adjusting mechanism, thereby adjusting the shape and length of the flame, ensuring accurate identification of the flame detector and improving the accuracy of flame detection. In addition, since the ever-burning lamp consumes little gas and requires little air intake, it is easier and more reliable to adjust using the adjusting mechanism of the present invention.

[0083] The ignition process of the flame-adjustable pilot lamp of this embodiment is as follows: first, a certain pressure of fuel gas is fed into the pilot lamp from the air inlet nozzle, and then the ignition needle is powered through an external high-voltage cable, and the ignition needle head generates an electric spark to the gun head to ignite the fuel gas, and the pilot lamp is ignited. After the pilot lamp is ignited, the position of the air regulating ring is adjusted to control the amount of air entering the gun barrel, and the length of the flame of the pilot lamp is changed to ensure that the flame can be accurately detected by the fire detector.

[0084] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0086] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A low nitrogen burner for a preheating furnace of an acetylene device, characterized in that: It comprises a burner body, a burner brick and an air gun assembly mounted on the burner body, wherein a combustion-supporting hole is provided on the side wall of the burner brick near the top; the air gun assembly comprises an inner ring gun and an outer ring gun, wherein the inner ring gun and the outer ring gun are respectively located on the inner and outer sides of the burner brick and are arranged one by one; a main hole and a secondary hole are provided on the outer ring gun nozzle of the outer ring gun, wherein the main hole is parallel to the inclined surface of the outer wall of the burner brick, the angle between the main hole and the axis of the outer ring gun is a1, and the angle between the secondary hole and the axis of the outer ring gun is a2, wherein a1<a2; a vertical spray hole and an inclined spray hole inclined toward the burner brick are provided on the inner ring gun nozzle of the inner ring gun; in a group of outer ring guns and inner ring guns arranged correspondingly, the main hole, the vertical spray hole and the inclined spray hole are located on the same plane; The combustion-supporting holes include a vertical hole and a horizontal hole opened on the top of the burner brick, the horizontal hole is set through the side wall of the burner brick, and the vertical hole connects the horizontal hole with the end face of the burner brick; There are multiple air gun assemblies, and the vertical holes and horizontal holes are multiple groups, and each air gun assembly is arranged corresponding to a group of vertical holes and horizontal holes; The inner ring gun adopts an L-shaped structure, one end of which is connected to the outer ring gun.

2. According to claim 1, a low nitrogen burner for a preheating furnace of an acetylene device, characterized in that: The included angle a1 between the main hole and the axis of the outer ring gun is 10°~15°, and the included angle a2 between the secondary hole and the axis of the outer ring gun is 15°~30°.

3. The low nitrogen burner for preheating furnace of acetylene device according to claim 1, characterized in that: There are two auxiliary holes, which are symmetrically arranged on one side of the main hole close to the burner brick; the main hole has a diameter of 4-8 mm, and the auxiliary hole has a diameter of 2-4 mm.

4. The low nitrogen burner for preheating furnace of acetylene device according to claim 1, characterized in that: The included angle b between the vertical spray hole and the inclined spray hole is 10° to 30°; the vertical spray hole and the inclined spray hole have the same aperture, which is 1.5 to 3 mm.

5. The low nitrogen burner for preheating furnace of acetylene device according to claim 1, characterized in that: The air gun assembly also includes a center gun, which is located at the center of the burner brick. A plurality of center spray holes are arranged on the center gun nozzle of the center gun, and the plurality of center spray holes are arranged obliquely toward the burner brick respectively.

6. The low nitrogen burner for preheating furnace of acetylene device according to claim 5, characterized in that: The included angle c0 between the central spray hole and the axis of the central gun is 30°-50°; the number of the central spray holes is 6 or 8, and the hole diameter is 1.5-3 mm.

7. A low nitrogen burner for a preheating furnace of an acetylene device according to any one of claims 1 to 6, characterized in that: The burner brick comprises a plurality of refractory bricks, and the plurality of refractory bricks are spliced ​​along the circumference to form the burner brick. The inclination angle d of the outer wall slope of the refractory brick is 10°~15°, and the height H of the outer wall slope is between 150~250mm.

8. A low nitrogen burner for a preheating furnace of an acetylene device according to any one of claims 1 to 6, characterized in that: A first flame detection pipe and a second flame detection pipe are arranged at 90° along the circumference on the side wall of the burner body, a permanent lamp is arranged in the burner body, the axis of the first flame detection pipe, the axis of the permanent lamp and the central gun axis of the air gun assembly are all located on the same plane, and the axis of the second flame detection pipe and the central gun axis of the air gun assembly are located on the same plane; And / or, the ever-burning lamp includes a gun barrel and an ignition needle, the ignition needle is arranged side by side with the gun barrel and is detachably connected to the gun barrel, one end of the gun barrel is provided with a gun head, and the other end is provided with an air inlet nozzle; a mixing chamber is provided on the gun barrel near the air inlet nozzle, an air hole is opened on the mixing chamber, and an air regulating mechanism cooperating with the air hole is provided on the gun barrel near the air inlet nozzle.

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