CN209763077U - oil-gas dual-purpose low-nitrogen burner - Google Patents

Abstract

the utility model provides a dual-purpose low NOx burner of oil gas, include: the flame stabilizing device comprises a fuel gun, a gas gun, an air channel and a flame stabilizing device, wherein the fuel gun is of a double-sleeve structure and comprises an oil return pipe (1), an oil supply pipe (2) sleeved outside the oil return pipe and a fuel nozzle assembly connected to one end of the oil return pipe and one end of the oil supply pipe; the fuel gas gun is of a hollow cylindrical structure and is sleeved outside the fuel oil gun, and a fuel gas circulation gap is formed between the inner side surface of the fuel gas gun and the outer side surface of the fuel oil gun; one end of the gas nozzle is connected with a gas nozzle component; the air channel (4) is sleeved on the outer side surface of the gas gun, and an air circulation gap is formed between the outer side surface of the gas gun and the inner side surface of the air channel at intervals; the flame stabilizing device is in a horn mouth shape and is connected with a combustion chamber in a hearth of the combustor. Through the structure design the utility model discloses can realize oil gas combined use or exclusive use, realize stable high-efficient burning, furthest restraines and reduces nitrogen oxide's formation and emission.

Description

Oil-gas dual-purpose low-nitrogen burner

Technical Field

The utility model relates to a belong to combustion apparatus technical field, concretely relates to dual-purpose low NOx burner of oil gas.

background

Due to the high energy consumption and high pollution of the coal-fired boiler, the reconstruction project of the coal-fired boiler is increasing day by day, in particular to a small and medium-sized coal-fired boiler. Coal-fired boilers are gradually being replaced by oil-fired, gas-fired boilers. Therefore, users of the oil burner and the gas burner are rapidly increasing. The appearance of the oil-gas dual-purpose burner meets different requirements of users. The switching of the fuel is automatically completed by the control part of the burner without manually changing the burner, and when an enterprise faces insufficient storage of single environment-friendly energy (oil or gas), switching to another fuel at any time can be considered. However, with the increasingly strict requirements of the environmental protection standard of the boiler, especially the requirement of the emission of nitrogen oxides, the combustion conditions of most of the existing oil and gas dual-purpose combustors cannot meet the new environmental protection requirement. Therefore, the development of an efficient and environment-friendly oil-gas dual-purpose combustor is a difficult problem which is urgently needed to be solved by current combustion science and technology workers.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to prior art not enough, the utility model provides a dual-purpose low NOx burner of oil gas of high efficiency, environmental protection realizes switching smoothly of oil, gas, effectively solves dual-purpose burner nitrogen oxide's of oil gas emission problem, reaches national and local emission standard.

in order to achieve the above object, the present invention provides the following technical solutions:

An oil and gas dual-purpose low-nitrogen burner, comprising:

a fuel gun is of a double-sleeve construction and includes an oil return tube, an oil supply tube, and a fuel nozzle assembly. The oil return pipe is in a cylindrical pipe shape. The front end of the oil return pipe is connected with an oil return outlet. The fuel supply pipe is sleeved outside the oil return pipe, and a fuel circulation gap is formed between the inner side surface of the fuel gun and the outer side surface of the oil return pipe at intervals and is in an annular cylindrical pipe shape. The front end of the fuel gun is closed, the bottom end of the fuel gun is connected with a fuel inlet, and the tail end of the fuel gun is connected with a fuel nozzle assembly. The fuel inlet is close to the closed end of the fuel gun and is externally connected with an oil supply system. The fuel nozzle assembly includes a splitter plate, a swirl plate, and an atomizing nozzle. The splitter plate, the swirl plate and the atomizing nozzle are positioned at the same side of the tail end of the fuel gun and are sequentially arranged from inside to outside. The through hole of the splitter plate is communicated with the annular cavity hole of the oil supply pipe, the through hole of the splitter plate is communicated with the cavity hole of the oil return pipe, the through hole of the splitter plate is communicated with the cavity hole of the spinning disk, and the cavity hole of the spinning disk is communicated with the spray hole of the atomizing nozzle.

The gas gun is a hollow cylindrical structure, is sleeved on the outer side of the fuel gun, and is provided with a gas circulation gap at intervals. The front end of the gas gun is closed, the bottom end of the gas gun is connected with a gas inlet, and the tail end of the gas gun is connected with a gas nozzle assembly. The gas inlet is close to the closed end of the gas gun and is externally connected with a gas supply system. The gas nozzle assembly is provided with a plurality of uniformly distributed gas spray pipes, the gas spray pipes are of straight pipe structures, the front ends of the gas spray pipes are spray pipe air inlets, the cross sections of the gas spray pipes are oval, and the gas spray pipes are connected with the tail ends of gas guns; the tail end of the gas spray pipe is a spray pipe gas outlet, and the cross section of the gas spray pipe is oval and faces the hearth. The central line of the gas spray pipe is from the direction of the gas inlet of the spray pipe to the direction of the gas outlet of the spray pipe to be gradually far away from the central line of the nozzle body, and a certain included angle is formed between the central line of the gas spray pipe and the central line of the combustor and the central line of the gas spray pipe to be directed to a backflow area in the bell mouth.

The gas gun lateral surface is located to the wind channel cover, the lateral surface of gas gun with the interval sets up and is formed with the circulation of air clearance between the medial surface in wind channel. The front end of the air duct is provided with a hollow sealing baffle and a closed end, and the tail end of the air duct is of an open structure and is provided with an air outlet. An air inlet is arranged at the bottom end of the air duct close to the closed section at the front end of the air duct. A swirler is arranged near the tail end of the air duct. The swirler is composed of a plurality of axial vanes. The axial blades are arranged on the sleeve at equal intervals on the outer side surface of the sleeve. The tail end of the air duct is connected with a bell mouth flame stabilizing device; the bell mouth flame stabilizing device is connected with a combustion chamber.

Preferably, the burner is used in conjunction with a flue gas recirculation, where the flue gas is mixed with air and then allowed to flow into the combustion chamber through the air inlet.

Preferably, the fuel gun, the gas gun and the air duct are arranged from inside to outside in the middle of the burner main body, and the horizontal section of the fuel gun, the horizontal section of the gas gun and the horizontal section of the air duct are coaxially arranged.

Preferably, the central line of the gas nozzle and the central line of the combustor form an included angle of 15-40 degrees.

Preferably, the angle between the bell mouth and the central line of the burner is 18-30 degrees.

Preferably, 20-40 gas spray pipes are arranged.

Preferably, 10-20 swirl blades are arranged.

Preferably, the depth of the gas gun and the fuel gun in the air duct can be adjusted back and forth by the support of the support sleeve.

Through the structure design, the utility model discloses can realize oil gas combined use or exclusive use, realize stablizing high-efficient burning, furthest restraines and reduces nitrogen oxide's formation and emission.

drawings

the accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:

fig. 1 is a schematic structural view of a dual-purpose low-nitrogen burner for oil and gas in an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the structure of a fuel injector assembly and a gas injector assembly according to an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of FIG. 1 along direction A according to the present invention;

fig. 4 is a schematic structural view of a fuel splitter vane according to an embodiment of the present invention;

Fig. 5 is a schematic structural view of a fuel swirler in an embodiment of the present invention.

description of reference numerals:

The fuel injection nozzle comprises a fuel return pipe 1, a fuel supply pipe 2, a fuel gas pipe 3, an air duct 4, a swirler 5, a sleeve 6, a fuel gas nozzle 7, a fuel oil splitter 8, a fuel oil swirl vane 9, an atomizing nozzle 10, a pouring material 11, a flame stabilizing device 12, a fuel return outlet 13, a fuel oil inlet 14, a fuel gas inlet 15, an air inlet 16, an oil mist nozzle 17, a fuel gas nozzle 18, an air swirl vane 19, a fuel distributing hole 20, a splitter vane central small hole 21, a swirler vane central small hole 22, an annular channel 23, a swirl chamber 24 and a tangential groove 25.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.

in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "end", "vertical", "horizontal", "top", "bottom", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention but do not require the present invention to be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of an oil-gas dual-purpose low-nitrogen burner according to an embodiment of the present invention; FIG. 2 is an enlarged view of a portion of the structure of a fuel injector assembly and a gas injector assembly according to an embodiment of the present invention; FIG. 3 is a schematic view of the structure of FIG. 1 along direction A according to the present invention; fig. 4 is a schematic structural view of a fuel splitter vane according to an embodiment of the present invention; fig. 5 is a schematic structural view of a fuel swirler in an embodiment of the present invention.

The utility model discloses a dual-purpose low NOx burner of oil gas, this combustor include fuel gun, gas gun, wind channel 4 and flame stabilizing device 12. Wherein, the fuel gun and the gas gun are both cylindrical tubular structures. Specifically, the fuel gun is of a double-sleeve structure and comprises an oil return pipe 1, an oil supply pipe 2 and a fuel nozzle assembly.

the oil return pipe 1 is a cylindrical pipe, and the front end (left end in fig. 1) of the oil return pipe 1 is connected with an oil return outlet 13. The oil supply pipe 2 is sleeved outside the oil return pipe 1 and is in an annular cylindrical pipe shape. The inner side surface of the fuel gun and the outer side surface of the oil return pipe 1 are arranged at intervals and form a fuel circulation gap, the front end of the fuel gun is closed, the bottom end close to the front end is connected with a fuel inlet 14, the fuel inlet 14 is externally connected with an oil supply system, and fuel provided by the oil supply system can enter the fuel gun through the fuel inlet 14 and flow in the fuel circulation gap. The tail end (right end in figure 1) of the fuel gun is connected with a fuel nozzle assembly, and fuel flows to the fuel nozzle assembly in the fuel flowing gap, is atomized by the fuel nozzle assembly and is sprayed into a hearth of the boiler to participate in combustion.

as shown in fig. 2, the fuel nozzle assembly includes a fuel splitter 8, a fuel swirler 9, and an atomizing nozzle 10. The fuel splitter 8, the fuel swirler 9 and the atomizing nozzle 10 are located on the same side of the tail end of the fuel gun and are sequentially arranged from inside to outside, namely, the fuel splitter, the fuel swirler and the atomizing nozzle are sequentially arranged from left to right and are simultaneously arranged from the center line of the burner from inside to outside. A plurality of oil distributing holes 20 are formed in each splitter blade of the fuel oil splitter 8, each oil distributing hole 20 is communicated with a fuel oil circulation gap of the fuel oil supply pipe 2, each oil distributing hole 20 of the fuel oil splitter 8 is also communicated with an annular channel 23 of the fuel oil spinning disk 9, the annular channel 23 of the fuel oil spinning disk 9 is communicated with a tangential groove 25, the tangential groove 25 of the fuel oil spinning disk 9 is communicated with a spinning chamber 24, and the other end of a cavity hole of the fuel oil spinning disk 9 is communicated with a spray hole of the atomizing nozzle 10. Namely, the fuel flows to the fuel nozzle assembly through the fuel flowing gap, firstly flows into the hole cavity of the fuel vortex sheet 9 after being shunted by the through hole of the fuel shunt sheet 8 in the fuel nozzle assembly, and flows into the atomizing nozzle 10 after swirling in the hole cavity.

In the oil injection process of the oil supply pipe 2, the fuel oil in the oil supply pipe 2 flows to the oil distribution holes 20 on the fuel oil distribution plate 8, then flows together into the corresponding annular channel 23 through the oil distribution holes 20, then enters the tangential groove 25 on the fuel oil vortex plate 9 and further flows into the vortex chamber 24, so that the oil flow forms high-speed rotating flow in the vortex chamber 24 of the fuel oil vortex plate 9, and finally is atomized and sprayed out from the central spray hole of the atomizing nozzle 10. The fuel oil splitter plate 8 is provided with a splitter plate central small hole 21, the fuel oil swirl plate 9 is also provided with a swirl plate central small hole 22, and the splitter plate central small hole 21 is communicated with the swirl plate central small hole 22 and is connected with an oil return pipe 1 communicated with the oil tank. The amount of oil supplied from the oil supply pipe 2 is thus divided into two parts, i.e., the amount of injected oil and the amount of returned oil. When the thermal load of the burner changes, the oil supply pressure and the oil supply amount are kept unchanged, and the opening degree of the oil return valve is changed to increase or decrease the oil return amount. After the fuel oil passes through the fuel oil splitter plate 8 and the fuel oil swirler plate 9, a part of the fuel oil can flow back to the oil return outlet 13 through the oil return pipe 1, and the part of the fuel oil can enter the fuel oil inlet 14 to continuously participate in circulation or be recycled after being recycled.

As shown in fig. 1, a gas gun is sleeved outside the fuel gun. The gas rifle is a hollow cylindric, and the lateral surface of gas rifle is located to the hollow cylinder pipe box of gas rifle promptly to and form the cavity clearance between the fuel gun, this clearance is the gas circulation clearance, and the gas can flow in the gas circulation clearance. The front end of the gas circulation gap of the gas gun is closed, and the bottom end close to the closed end is connected with a gas inlet 15 which is externally connected with a gas supply system. The tail end of the gas gun is connected with a gas nozzle assembly for spraying gas into the hearth.

A plurality of uniformly distributed gas spray pipes 7 are arranged on the gas nozzle component, the gas spray pipes 7 are of a straight pipe type structure, the front ends (left ends) of the gas spray pipes 7 are spray pipe air inlets and are connected with the tail ends of gas guns, and the sections of the gas spray pipes 7 are oval; the tail end of the gas spray pipe 7 is a spray pipe gas outlet 18, the cross section of which is oval and is arranged towards the hearth. The central line of the gas nozzle 7 is gradually far away from the central line of the nozzle body from the direction from the gas inlet of the nozzle to the gas outlet 18 of the nozzle, and the central line of the nozzle body is superposed with the central line of the burner, namely, the central line of the gas nozzle 7 and the central line of the burner form a certain included angle and point to the back flow area of the bell-mouth-shaped flame stabilizer 12.

Furthermore, an air duct 4 is also sleeved on the outer side surface of the gas gun. The air duct 4 is a cylindrical tubular structure, and an air circulation gap is formed between the outer side surface of the gas gun and the inner side surface of the air duct 4 at intervals. The front end of the air duct 4 is provided with a hollow sealing baffle plate and a closed end, and the tail end is of an open structure and is provided with an air outlet. An air inlet 16 is arranged at the bottom end of the air duct 4 close to the closed section at the front end of the air duct. A swirler 5 is provided near the end of the air duct.

specifically, as shown in fig. 2 and 3, the swirler 5 includes a sleeve 6 and a plurality of air swirling vanes 19, and the air swirling vanes 19 are fitted over the sleeve 6 and are disposed at equal intervals on the outer side surface of the sleeve 6. The end of the air duct 4 is connected with a flare-shaped flame stabilizer 12, and the flare-shaped flame stabilizer 12 is connected with the combustion chamber of the hearth. Air enters the air duct 4 through the air inlet 16, flows to the cyclone 5 in the air circulation gap, enters the cyclone 5, is subjected to cyclone dispersion and acceleration through the air cyclone blades 19, enters the flame stabilizing device 12, forms cross jet with the sprayed fuel gas or fuel oil in the flame stabilizing device 12, and further enters the combustion chamber of the hearth for combustion.

Preferably, the number of the gas spray pipes 7 is 20-40, and the central line of the gas spray pipes and the central line of the combustor form an included angle of 15-40 degrees.

preferably, the bell-mouth generatrix of the flame stabilizing device 12 forms an included angle of 18-30 degrees with the central line of the burner. Further, the minimum diameter of the flame holding means 12 should be larger than the outer diameter of the air duct 4, and this design can avoid combustion wear.

Preferably, the number of the air swirling blades 19 is 10-20, and further preferably, the number of the air swirling blades 19 in the present application is 12.

When the gas gun and the fuel gun are installed, the depth of the gas gun and the fuel gun placed in the air channel 4 can be adjusted forwards and backwards by means of the support sleeve to be installed at the optimal position, and the optimal position can be selected and determined according to the actual situation.

Be equipped with flue gas reflux unit on the combustor of this application, can adopt flue gas backward flow to jointly use, the flue gas mixes the back with the air promptly, can flow into the combustion chamber by air inlet 16.

In this application, the air cycle process of the dual-purpose low NOx burner of oil gas is: outside air (or part of external circulating flue gas output from the tail part of the mixing boiler) enters the air duct 4 from the air inlet 16 after being pressurized by the blower, and forms rotary airflow through the cyclone 5 to be sprayed into the combustion chamber.

The utility model discloses in, the fuel oil circulation process is burnt to the pure of dual-purpose low NOx burner of oil gas: the fuel oil is pressurized by the fuel supply system and then enters the fuel supply pipe 2 through the fuel inlet 14, flows into the plurality of oil distribution holes 20 in the fuel oil splitter plate 8 through the fuel supply pipe 2, is sprayed out through the oil distribution holes 20 and then flows into the annular channel 23 in the fuel oil spinning disk 9, then enters the tangential groove 25 in the fuel oil spinning disk 9 and further enters the spinning chamber 24, so that the fuel oil flows in the spinning chamber 24 of the fuel oil spinning disk 9 to rotate at a high speed, and finally is sprayed out from the central nozzle on the atomizing nozzle 10 in a rotating mode. The splitter plate 8 is provided with a small center hole 21, the fuel swirler plate 9 is also provided with a small center hole 22, and the small center hole 21 of the splitter plate is communicated with the small center hole 22 of the swirler plate and is connected with an oil return pipe 1 communicated with the oil tank. The amount of oil supplied from the oil supply pipe 2 is thus divided into two parts, i.e., the amount of injected oil and the amount of returned oil. When the thermal load of the burner changes, the oil return amount is increased or decreased by increasing or decreasing the opening of the oil return valve to adjust the size of the oil injection amount, so that when the burner runs at low load, the oil pressure can still maintain higher pressure to maintain good atomization quality of fuel oil. The return oil enters the oil return pipe 1 through a central small hole 22 of the spinning disk in the spinning disk and a central small hole 21 of the splitter plate in the fuel splitter plate 8, and finally enters the fuel inlet 14 to continue to participate in circulation or is recycled after being recycled. The oil flow rotating at high speed is injected into the furnace from the oil mist nozzle 17 of the atomizing nozzle 10. The air or smoke-air mixture entering the air duct 4 enters the rotational flow passage formed by the air rotational flow blades 19 to form a rotational air flow to collide with the oil flow, so that the oil flow is atomized. The rotating airflow forms a central negative pressure area, and a hot fluid backflow area can be formed at the oil mist nozzle 17, so that the ignition performance is improved, and the flame is stabilized.

The utility model discloses in, the gas flow is burnt to the pure of dual-purpose low NOx burner of oil gas as follows: the gas enters the gas pipe 3 from the gas inlet 15 through the gas supply system, enters a plurality of uniformly distributed gas nozzles 7 with certain inclination angles through the right end of the gas pipe 3, is injected into the hearth, and then is subjected to diffusion mixed combustion with air or smoke and air mixed gas output by the cyclone 5.

The utility model discloses in, the dual-purpose flow of oil gas of the dual-purpose low NOx burner of oil gas is as follows:

The fuel oil is pressurized by the fuel supply system and then enters the fuel supply pipe 2 from the fuel oil inlet 14, flows into the plurality of small holes on the fuel oil splitter vane 8 through the fuel supply pipe 2, then flows into the channel of the fuel oil spinning vane 9 through the small holes in a confluence manner, so that the oil flow rotates at a high speed in the fuel oil spinning vane 9, and finally is sprayed out from the central nozzle on the atomizing nozzle 10 in a rotating manner. In addition, in the process of spraying the fuel oil, the oil return quantity is adjusted to meet the quality requirement of fuel oil atomization by ensuring that the oil pressure is unchanged, and the return oil flows back through the oil return pipe 1.

Meanwhile, the gas enters the gas pipe 3 from the gas inlet 15 through the gas supply system, enters a plurality of uniformly distributed gas spray pipes 7 with certain inclination angles through the right end of the gas pipe 3, is sprayed into the hearth, and then is subjected to diffusion mixed combustion with the air or smoke and air mixed gas output by the cyclone 5.

the atomized fuel oil, the sprayed fuel gas and the air or smoke-air mixture sprayed from the cyclone are further mixed and combusted in the flame holder 12.

The structure of this application has following advantage down:

The air duct 4 is internally provided with a swirler 5, air is in a rotating flow after passing through a swirling flow channel and is combined with a flame stabilizing device 12, a backflow area of hot air flow is formed at the outlet of the nozzle, the ignition performance is improved, and stable ignition and combustion are realized.

The combustor can be used together with flue gas backward flow, and after mixing flue gas and air, can flow into the wind channel by the air inlet, forms low temperature, low oxygen concentration combustion atmosphere, effectively inhibits NO _x's formation, and the flue gas circulation rate can reach 30 ~ 40%.

_xin the nozzle assembly, the nozzle assembly is arranged on the inner side of the air pipe, the oil flow or the gas flow is surrounded by the air flow (or the wind-smoke mixed flow) rotating around, and the fuel flow and the air flow (or the wind-smoke mixed flow) are in intersected jet flow, so that the fuel flow and the air flow are favorable for quick mixing and ignition combustion of the fuel flow and the air flow, and the formed flame is diffused from the center to the periphery of the combustor under the guiding action of the bell-mouth flame stabilizing device and is mixed with high-temperature smoke sucked by vortex.

the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a dual-purpose low NOx burner of oil gas which characterized in that includes: a fuel gun, a gas gun, an air duct and a flame stabilizing device, wherein,

The fuel gun is of a double-sleeve structure and comprises an oil return pipe (1), an oil supply pipe (2) sleeved outside the oil return pipe and a fuel nozzle assembly connected to the oil return pipe and one end of the oil supply pipe;

The other end of the oil return pipe is connected with an oil return outlet (13); a fuel oil circulation gap is formed between the oil supply pipe and the oil return pipe; one end of the oil supply pipe close to the oil return outlet is arranged in a closed mode, the bottom end of the oil supply pipe is connected with a fuel inlet (14), and one end of the oil supply pipe far away from the oil return outlet is connected with a fuel nozzle assembly;

The fuel gas gun is of a hollow cylindrical structure and is sleeved outside the fuel oil gun, and a fuel gas circulation gap is formed between the inner side surface of the fuel gas gun and the outer side surface of the fuel oil gun; one end of the gas gun close to the oil return outlet is closed, the bottom end of the gas gun is connected with a gas inlet (15), and one end of the gas gun far away from the oil return outlet is connected with a gas nozzle assembly;

the air channel (4) is sleeved on the outer side surface of the gas gun, and an air circulation gap is formed between the outer side surface of the gas gun and the inner side surface of the air channel at intervals; one end of the air duct, which is close to the oil return outlet, is provided with a sealing baffle plate and a sealing end, the bottom end of the air duct is provided with an air inlet (16), and the end, which is far away from the oil return outlet, is of an open structure and is provided with an air outlet; a swirler (5) is arranged in the air outlet, and air flows out of the air outlet after passing through the swirler; the air outlet is connected with a flame stabilizing device (12), and the flame stabilizing device is of a horn mouth type and is connected with a combustion chamber in the hearth of the combustor.

2. The dual-purpose low-nitrogen gas-oil burner of claim 1,

The fuel nozzle assembly comprises a fuel splitter plate (8), a fuel swirler plate (9) and an atomizing nozzle (10); the fuel oil splitter plate, the fuel oil swirl plate and the atomizing nozzle are sequentially arranged on the same side of one end of the fuel oil gun away from the oil return outlet; one end of an oil distributing hole (20) of the fuel oil splitter plate is communicated with the fuel oil circulation gap, the other end of the oil distributing hole is communicated with one end of an annular channel (23) of the fuel oil spinning disk, and the annular channel of the fuel oil spinning disk is communicated with a spinning chamber (24) positioned in the center of the fuel oil spinning disk through a tangential groove (25) and is further communicated with a spray hole of the atomizing nozzle;

Wherein, the central point of fuel flow distribution piece puts and is equipped with flow distribution piece central pore (21), the central point of fuel spinning disk puts and is equipped with spinning disk central pore (22), flow distribution piece central pore with spinning disk central pore intercommunication simultaneously with return oil pipe intercommunication for with the oil stream of not atomizing leading-in return oil pipe.

3. The dual-purpose low-nitrogen gas-oil burner of claim 1,

Be equipped with several evenly distributed's gas spray tube (7) on the gas nozzle subassembly, the gas spray tube is straight tube type structure, the gas spray tube with the one end that the gas rifle is connected is the spray tube air inlet, and the other end orientation furnace is spray tube gas outlet (18), gas spray tube central line certainly the spray tube air inlet points to the spray tube gas outlet direction is kept away from gradually the central line of combustor.

4. the dual-purpose low-nitrogen gas-oil burner of claim 3,

The swirler (5) comprises a sleeve (6) and a plurality of air swirl vanes (19); the sleeve is sleeved on the outer side surface of the gas gun, and the air swirl blades are arranged on the outer side surface of the sleeve (6) at equal intervals.

5. the dual-purpose low-nitrogen gas-oil burner of claim 1,

The combustor is provided with a smoke backflow device, and smoke and air can flow into the combustion chamber through the air inlet after being mixed.

6. The dual-purpose low-nitrogen gas-oil burner of claim 1,

The fuel gun, the gas gun and the air duct are arranged coaxially with the burner.

7. The dual-purpose low-nitrogen gas-oil burner of claim 3,

The central line of the gas nozzle and the central axis of the burner form an included angle of 15-40 degrees.

8. The dual-purpose low-nitrogen gas-oil burner of claim 1,

And the bell mouth of the flame stabilizing device forms an included angle of 18-30 degrees with the central axis of the burner.

9. The dual-purpose low-nitrogen gas-oil burner of claim 4,

The number of the gas spray pipes is 20-40, and the number of the air swirl blades is 10-20.

10. The dual-purpose low-nitrogen gas-oil burner of claim 1,

The gas gun and the fuel gun are detachably connected with the air channel.