CN210165377U

CN210165377U - Energy-saving low-nitrogen combustor and energy-saving low-nitrogen combustion system

Info

Publication number: CN210165377U
Application number: CN201920758467.0U
Authority: CN
Inventors: 彭亦楚
Original assignee: Guangdong Shanglide Technology Co Ltd
Current assignee: Guangdong Shanglide Technology Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-03-20
Anticipated expiration: 2029-05-23

Abstract

The utility model provides an energy-conserving low-nitrogen combustor, including outer tube, interior bobbin and waste gas resorption structure, outer tube one end is for going out the fire end, the other end is the inlet end, the inlet end is provided with combustion-supporting air interface, interior bobbin penetrates in outer tube, set up the gas interface on the interior bobbin, waste gas resorption structure includes waste gas updraft ventilator and heat exchanger, the heat exchanger has first air inlet interface, the first air-out interface of corresponding first air inlet interface, second air inlet interface and the second air-out interface that corresponds second air inlet interface, first air inlet interface is used for absorbing the waste gas that furnace discharged, first air-out interface connection waste gas updraft ventilator, a combustion-supporting air conveyor of second air inlet interface connection, second air-out interface connection, waste gas gets into waste gas updraft ventilator behind heat exchanger and the combustion-supporting air heat transfer. The utility model also provides an energy-conserving low-nitrogen combustion system. The utility model discloses energy-conserving low-nitrogen combustor can fully realize energy-conserving and waste gas updraft ventilator not fragile.

Description

Energy-saving low-nitrogen combustor and energy-saving low-nitrogen combustion system

Technical Field

The utility model relates to a gas boiler low nitrogen combustion technology field, in particular to energy-conserving low nitrogen combustor and energy-conserving low nitrogen combustion system.

Background

In recent years, the economic growth of China is rapid, the energy consumption is remarkably improved, and the problem of environmental pollution caused by the energy consumption is increasingly severe. During the combustion process, a large amount of nitrogen oxides (NOx) are generated, causing serious damage to the ecological environment. Therefore, the environmental protection sector is also demanding more and more on the emission limits of the pollutants produced by combustion.

At present, in an industrial furnace, a burner is installed on a furnace body to heat in a hearth, a burner nozzle of the burner faces into the furnace body, combustion-supporting gas is input through a combustion-supporting pipe of the burner, fuel is input through a fuel pipe, and the combustion-supporting gas and the fuel are mixed at the burner nozzle and then ignited to burn, so that the heating is realized by burning flame in the hearth. The flame temperature is higher, the generation amount of nitrogen oxides is also high, the general combustion temperature exceeds 350 degrees, more nitrogen oxides can be generated, and most of the current local environmental protection authorities have strict emission control requirements on the emission of the nitrogen oxides, such as the emission standard of the nitrogen oxides discharged by a newly-built boiler, which is provided in the CN106594716 background technology. The flue gas recirculation technology is a technology which is commonly adopted at present for reducing the flame temperature, can reduce the generation amount of nitrogen oxides, namely exhaust waste gas is sucked into a combustion chamber of a combustor again, so as to reduce the oxygen concentration and reduce the temperature during combustion, the flue gas recirculation technology is disclosed in CN106594716 patent and CN106287696 patent technologies, and the like, the structural principle of the flue gas recirculation technology is mostly as shown in figure 1, a waste gas recirculation pipe 2A is directly connected at a smoke outlet of a hearth 1A, the flue gas recirculation pipe is sucked by a waste gas exhaust device 4A, a large amount of waste gas at a smoke outlet is absorbed and is led into a combustor 3A, the waste gas is mixed and combusted with combustion-supporting gas and fuel gas, because the content of oxygen in the waste gas is low, the content of carbon dioxide, nitrogen oxides and the like which are not combustion-supporting is high, the concentration of oxygen in the combustion-supporting gas in the combustion chamber can be reduced, the combustion temperature can be reduced during, the emission of nitrogen oxides is controlled. Among the above-mentioned flue gas recirculation mode, the flue gas gets into the combustor through exhaust gas updraft ventilator for exhaust gas updraft ventilator easily generates heat and damages, in addition, because the waste gas that gets into directly gets into furnace after mixing, heat utilization is not high.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a low-nitrogen burner with improved durability and energy saving.

The utility model relates to a technical solution:

an energy-saving low-nitrogen burner comprises an outer tube, an inner tube and a waste gas resorption structure, wherein one end of the outer tube is a fire outlet end, the other end of the outer tube is a gas inlet end, the gas inlet end is provided with a combustion-supporting gas interface, the inner tube penetrates into the outer tube, the inner tube is provided with a gas interface, combustion-supporting gas led in by the outer tube and gas led in by the inner tube are mixed in the fire outlet end of the outer tube and then ignited and combusted, the waste gas resorption structure comprises a waste gas exhaust device and a heat exchanger, the heat exchanger is provided with a first air inlet interface and a first air outlet interface corresponding to the first air inlet interface, a second air inlet interface and a second air outlet interface corresponding to the second air inlet interface, the first air inlet interface is used for absorbing waste gas discharged by a hearth, the first air outlet interface is connected with the waste gas exhaust device, the second air inlet interface is connected with a combustion-supporting gas conveying device, the second air outlet interface is connected with the, waste gas updraft ventilator conveys waste gas and mixes with the leading-in combustion-supporting gas of outer tube section of thick bamboo, the leading-in gas of inner tube section of thick bamboo, burns in going out the fire end.

Further, the waste gas resorption structure includes the waste gas back flow, and the waste gas back flow penetrates in the inner tube, and waste gas updraft ventilator passes through pipeline one end and connects first air-out interface, and the waste gas back flow is connected to the other end.

Further, the fire outlet end is provided with a combustion space section, the inner pipe barrel is provided with an air outlet end, the outer peripheral wall of the air outlet end is connected with a premixing pipe, and the other end of the premixing pipe extends to the combustion space section.

Further, the air outlet end of the inner tube extends to a position adjacent to the premixing tube, and the flue gas return pipe extends to a position adjacent to the combustion space section.

Furthermore, an inner end edge is formed at one end of the premixing pipe and fixedly connected with the outer peripheral wall of the air outlet end of the inner pipe barrel, an outer end edge is formed at the other end of the premixing pipe and fixedly connected with the inner peripheral wall of the outer pipe barrel, vent holes are formed in the inner end edge so that part of combustion-supporting air entering the outer pipe barrel enters the premixing pipe, and air passing holes are formed in the outer end edge so that part of the combustion-supporting air entering the outer pipe barrel enters the combustion space section to be combusted.

The utility model provides an energy-conserving low nitrogen combustion system, includes the furnace body and installs the energy-conserving low nitrogen combustor on the furnace body, and the furnace body has furnace, has seted up the burner hole on the front side oven of furnace body, and the top of furnace body is close to the rear side oven wall and is provided with the smoke window to supply the exhaust gas in the furnace after the discharge burning, energy-conserving low nitrogen combustor adopt energy-conserving low nitrogen combustor, it is installed on the front side oven of furnace body, and the port of the end of giving a fire of outer tube stretches into to the furnace in.

The utility model discloses a set up the heat exchanger, can preheat the combustion-supporting gas that the external world sent into, send into to preheat intraductal combustion-supporting gas and change after preheating and light, simultaneously, waste gas self has reduced the temperature for it is relatively lower to get into the interior exhaust gas temperature of combustion space section, is favorable to reducing the temperature of burning. Compare in the tradition, the waste gas of traditional low-nitrogen burner directly gets into out the end of a fire burning and then discharges into furnace, and most is discharged from the smoke window again, the heat of the waste gas of the make full use of, the low-nitrogen burner of this application make full use of the heat of waste gas, and is more energy-conserving to, waste gas gets into and passes through the heat exchanger heat transfer at waste gas updraft ventilator, has reduced the temperature in the waste gas that gets into waste gas updraft ventilator, and protection waste gas updraft ventilator is not damaged by high temperature.

Drawings

FIG. 1 is a schematic diagram of a prior art low NOx combustion system;

FIG. 2 is a schematic cross-sectional view of a low-nitrogen burner according to the present invention;

FIG. 3 is an enlarged view of a partial cross-sectional view of the low-nitrogen burner of the present invention;

FIG. 4 is a perspective view of the low-nitrogen energy-saving combustion system of the present invention;

FIG. 5 is a schematic view, partially in section, of a first perspective of the low nitrogen, energy efficient combustion system of the present invention;

fig. 6 is a schematic partial sectional view of a second view of the low-nitrogen energy-saving combustion system of the present invention.

Detailed Description

The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the drawings in the embodiment of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.

Referring to fig. 2 and 3, the present invention provides a low-nitrogen burner, including an outer tube 1, an inner tube 2 and a waste gas recycling structure 3, the outer tube 1 is provided with a combustion-supporting gas port 11, the inner tube 2 penetrates into the outer tube 1, the inner tube 2 is provided with a gas port 21 for mixing combustion-supporting gas introduced from the outer tube 1 with gas introduced from the inner tube 2 at a fire outlet end and igniting the mixture, the waste gas recycling structure 3 includes a waste gas recycling tube cover 31 and a waste gas draft device 32, the waste gas recycling tube cover 31 is disposed on the outer peripheral wall of the outer tube 1 and provided with a waste gas recycling hole 311, the waste gas draft device 32 is connected to the waste gas recycling tube cover 31, the waste gas recycled to the rear of the fire outlet end after burning is sucked into the waste gas recycling tube cover 31 and transferred into the fire outlet end of the outer tube 1, the recycled waste gas is mixed with the combustion-supporting gas introduced from the outer tube 1, and the waste gas recycling structure 3, The gas introduced into the inner pipe barrel 2 is mixed and combusted in the fire outlet end.

One end of the outer tube 1 is a fire outlet end, the other end of the outer tube is an air inlet end, the fire outlet end is used for spraying out burning flames, the outer tube has a burning space section 101, a port of the air inlet end is closed and only allows the inner tube 2 to pass through, and the outer peripheral wall of the air inlet end is provided with the combustion-supporting air interface 11 for connecting the combustion-supporting air conveying device 35 to input combustion-supporting air into the outer tube 1.

One end of the inner tube barrel 2 is an air outlet end, the other end is an air inlet end, the inner tube barrel 2 extends into the outer tube barrel 1 through the end wall of the air inlet end of the outer tube barrel 1, the air inlet end is exposed out of the outer tube barrel 1, the gas outlet end of the gas mixing pipe extends to the combustion space section 101 of the outer pipe barrel 1, the port of the gas inlet end of the inner pipe barrel 2 is closed, the gas interface 21 is arranged on the peripheral wall of the gas inlet end, the peripheral wall of the gas outlet end of the inner pipe barrel 2 is connected with a premixing pipe 4, the pipe diameter of the premixing pipe 4 is larger than the outer diameter of the inner pipe barrel 2 and smaller than the inner diameter of the outer pipe barrel 1, an inner end edge is formed at one end of the premixing pipe 4 and fixedly connected with the peripheral wall of the gas outlet end of the inner pipe barrel 2, the outer end edge is formed at the other end and fixedly connected, so that the combustion-supporting gas entering the outer tube 1 partially enters the premixing tube 4, the outer end edge is provided with a gas passing hole 42, so that the combustion-supporting gas entering the outer tube 1 partially enters the combustion space section 101 for combustion. Further, for the air current intensive mixing in combustion space section 101, the intensive combustion, cross gas pocket 42 and adopt spiral pore structure, and a plurality of gas pockets 42 of crossing adopt the same spiral direction, so, the combustion-supporting gas that gets into in combustion space section 101 from gas pocket 42 is the spiral wind, can improve the mixed effect, and the burning is abundant, and the flame outwards scurries farther from combustion space section 101, more is favorable to the furnace heating.

Part of the combustion-supporting gas is premixed with the fuel gas in the premixing pipe 4 and ignited, so that the ignition is not easy to extinguish, and then the combustion enters the combustion space section 101 and is fully mixed and combusted with the other part of the combustion-supporting gas entering the combustion space section 101.

It will be appreciated that an electric spark ignition device (not shown) is disposed within premix tube 4 and may ignite the premix gas within premix tube 4 by an electron splash spark.

It will be appreciated that in order to achieve adequate premixing of the combustion gases and the combustion air entering the pre-mixing tube 4, the end of the inner barrel 2 received within the pre-mixing tube 4 should not be too long, and preferably extends into the adjacent position of the pre-mixing tube 4, in this embodiment the inner barrel 2 extends substantially to the adjacent position of the pre-mixing tube 4 and slightly beyond.

The waste gas suck-back pipe cover 31 is in a pipe barrel shape, is sleeved on the outer peripheral wall of the fire outlet end of the outer pipe barrel 1, and comprises a barrel part and ring plates formed at two ends in the barrel part, wherein the ring plates are fixedly connected on the outer peripheral wall of the outer pipe barrel 1, and the ring plates in the same direction as the fire outlet end are provided with the waste gas suck-back holes 311 for the waste gas to enter the barrel part of the waste gas suck-back pipe cover 31; an air outlet connector is arranged on the peripheral wall of the cylinder part, and the waste gas exhaust device 32 is connected with the air outlet connector so as to guide out the waste gas in the cylinder part and convey the waste gas to the combustion space section in the outer cylinder 1.

The exhaust gas suck-back structure 3 further comprises an exhaust gas return pipe 33, one end of the exhaust gas return pipe 33 penetrates from the closed end of the inner pipe barrel 2, penetrates out of the other end of the inner pipe barrel 2 and then extends to the combustion space section 101, and the other end of the exhaust gas return pipe is connected with the exhaust gas draft device 32 so that the exhaust gas draft device 32 can guide the combusted exhaust gas into the combustion space section 101 in the outer pipe barrel 1.

It will be appreciated that, preferably, to ensure that the premixed gas in the premix tube ignites well and does not extinguish easily after ignition, wastegate 33 passes through premix tube 4 to direct the flue gas into the combustion space section, otherwise wastegate 33 would extend into premix tube 4. Furthermore, a port of the inner tube 2 connected to one end of the pre-mixing tube 4 is provided with a conical wall fixedly connected to the periphery of the exhaust gas return pipe 33, and the conical wall is provided with air holes 22, so that air in the inner tube 2 can enter the pre-mixing tube 4 through the air holes 22.

The exhaust gas back suction structure 3 further comprises a heat exchanger 34, the heat exchanger 34 comprises a heat exchange box body and a heat exchange tube arranged in the box body, a first air inlet interface, a first air outlet interface, a second air inlet interface and a second air outlet interface are arranged on the heat exchange box body, the first air inlet interface is communicated with the heat exchange tube, the first air outlet interface is communicated with the heat exchange tube, so that air entering from the first air inlet interface flows out of the first air outlet interface after flowing through the heat exchange tube, and air entering from the second air inlet interface flows out of the second air outlet interface after flowing through the box body. First air inlet interface connection waste gas resorption pipe cover 31's interface of giving vent to anger, first air-out interface connection waste gas updraft ventilator 32 to waste gas updraft ventilator 32 will follow the waste gas of suction in the waste gas resorption pipe cover 31 and carry through the heat exchanger, realize the heat transfer to waste gas. And, set up heat exchanger 34 before waste gas updraft ventilator 32, reduced the temperature in the waste gas that gets into waste gas updraft ventilator 32 to can protect waste gas updraft ventilator 32 not damaged by high temperature, otherwise the waste gas of high temperature directly gets into waste gas updraft ventilator 32, can damage waste gas updraft ventilator 32 easily, and waste gas updraft ventilator 32's motor burns out easily under the high temperature environment.

The heat transfer can carry out the heat transfer with the external combustion-supporting gas of carrying to combustion-supporting gas interface 11, specifically, a combustion-supporting gas conveyor 35 is connected to the second air inlet interface, and second air-out interface connection is to combustion-supporting gas interface 11, so, can pass through the heat exchanger heat transfer with the higher waste gas of temperature from the combustion-supporting gas of carrying, preheats the combustion-supporting gas of carrying, has fully utilized the heat energy of combustion-supporting gas, plays energy-conserving effect.

In addition, for the convenience of low nitrogen combustor's processing, earlier interior bobbin 2, exhaust gas reflux pipe 33, the end edge at pre-mixing pipe 4 and pre-mixing pipe 4 both ends, wholly process into one whole, then with interior bobbin 2 install to outer bobbin 1 on can, for the convenience of low nitrogen combustor's interior bobbin 2 and the assembly of outer bobbin 1, the first ring flange is formed to the inlet end port periphery of outer bobbin 1, the income gas end periphery wall of interior bobbin 2 forms second ring flange 7, interior bobbin 2 penetrates to in the outer bobbin 1, two ring flanges are connected with aiming at mutually.

In addition, in order to facilitate the installation of the low-nitrogen burner to the boiler body, a flange 5 is formed on the outer periphery of the exhaust-gas-return-pipe cover 31, and the low-nitrogen burner can be easily fixed to the boiler body.

When the low-nitrogen burner is used, please refer to fig. 4 to 6 again, a low-nitrogen energy-saving combustion system includes a furnace body 6 and the low-nitrogen burner installed on the furnace body 6, the furnace body 6 has a hearth, a burner hole 61 is opened on the front side wall of the furnace body 6, the aperture of the burner hole 61 is approximately corresponding to or slightly larger than the outer diameter of the waste gas suck-back pipe cover 31, and the waste gas suck-back pipe cover 31 of the low-nitrogen burner can be sleeved in. The top end of the furnace body 6 is provided with a smoke window 62 adjacent to the rear furnace wall for discharging the waste gas in the combustion furnace. The low-nitrogen burner is arranged on the front furnace wall of the furnace body 6, and the port of the fire outlet end of the outer tube 1 extends into the hearth.

When the low-nitrogen energy-saving combustion system operates, the combustion-supporting gas conveying device 35 is started to convey combustion-supporting gas, a gas device (not shown) conveys gas, the combustion-supporting gas passes through the heat exchanger 34, the gas is conveyed into the outer tube 1 from a combustion-supporting gas interface, the gas is conveyed into the inner tube 2 from a gas interface, then the gas enters the premixing tube 4, part of the combustion-supporting gas enters the premixing tube 4 to be premixed with the gas, the ignition device ignites the premixing gas in the premixing tube 4, flame is introduced into the combustion space section 101, the combustion-supporting gas is further supplemented into the combustion space section 101, the combustion-supporting gas and the premixing gas are fully combusted, the flame is sprayed into the hearth, and the hearth is heated. Flame spouts when, through the utility model discloses people observes and studies repeatedly, combine a lot of repetition test, can produce a large amount of waste gases after the flame burning that spouts forward and circle round to outer pipe 1 and go out fire end periphery, partly waste gas is arranged to smoke window 62, start waste gas updraft ventilator 32, the waste gas that accumulates in outer pipe 1 play fire end periphery gets into waste gas resorption pipe cover 31, then through heat exchanger 34, reentrant waste gas reflux pipe 33, discharge into to combustion space section 101 in, with the gas in the combustion space section 101, the combustion-supporting gas mixed combustion, because the oxygen content is few in the waste gas, thereby can dilute the density of oxygen in the combustion-supporting gas, reduce the combustion temperature in the combustion space section 101, control nitrogen oxide's formation volume effectively, reach the control requirement of environmental protection.

By adopting the low-nitrogen combustor, a large amount of exhaust gas can be circularly introduced into the combustion space section 101 to be mixed with the combustion-supporting gas and the fuel gas, the combustion temperature is maintained below the temperature at which a large amount of nitrogen oxides are generated for a long period of time, and when the combustion temperature rises and the amount of nitrogen oxides generated is large, the concentration of nitrogen oxides in the exhaust gas is also high, and the amount of nitrogen oxides circularly introduced into the combustion space section is also large, thereby lowering the combustion temperature.

This application is through setting up the heat exchanger, can preheat the combustion-supporting gas that the external world sent into, send into to preheat intraductal combustion-supporting gas and change after preheating and light, simultaneously, waste gas self has reduced the temperature for it is lower relatively to get into the waste gas temperature in the combustion space section, is favorable to reducing the temperature of burning. Compare in the tradition, the waste gas of traditional low-nitrogen burner directly gets into out the end of a fire burning and then discharges into furnace, and most is discharged from the smoke window again, the heat of the waste gas of the make full use of, the low-nitrogen burner of this application make full use of the heat of waste gas, and is more energy-conserving, and waste gas gets into and passes through the heat exchanger 34 heat transfer at waste gas updraft ventilator 32, has reduced the temperature in the waste gas that gets into waste gas updraft ventilator 32, and protection waste gas updraft ventilator 32 is not damaged by high temperature.

It can be understood that in the application, the combustion-supporting gas is not limited to air, but also can be other combustion-supporting media, and the fuel gas is not limited to natural gas, but can be other fuel media, even fuel oil and the like.

It can be understood that the low-nitrogen energy-saving combustion system comprises a control box 8, and the control box 8 is arranged outside the boiler and used for starting and adjusting the rotating speed of the combustion-supporting gas conveying device and the rotating speed of the fuel gas conveying device, so that the conveying amount of the combustion-supporting gas and the fuel gas is controlled.

It can be understood that the absorption of waste gas is not limited to through setting up waste gas resorption pipe cover 31 and absorbing waste gas in outer bobbin 1 play fire end periphery, also can absorb the waste gas that furnace discharged to smoke window department through first air inlet interface connecting tube, absorb the waste gas that furnace discharged through the first air inlet interface of heat exchanger 34, first air-out interface connection waste gas updraft ventilator 32, a second air inlet interface connection combustion-supporting gas conveyor 35, second air-out interface connection combustion-supporting gas interface 11, waste gas gets into waste gas updraft ventilator 32 after heat exchange with combustion-supporting gas through heat exchanger 34, waste gas updraft ventilator 32 conveys waste gas to the combustion-supporting gas with outer bobbin 1 is leading-in, the leading-in gas of inner bobbin 2 mixes, the end internal combustion of going out fires, can fully realize energy-conservation and waste gas updraft ventilator 32 is not fragile.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transformation that the content of the specification does, or directly or indirectly use in other related technical fields, all including in the same way the patent protection scope of the present invention.

Claims

1. An energy-saving low-nitrogen burner comprises an outer tube (1) and an inner tube (2), wherein one end of the outer tube (1) is a fire outlet end, the other end of the outer tube is an air inlet end, the air inlet end is provided with a combustion-supporting air interface (11), the inner tube (2) penetrates into the outer tube (1), the inner tube (2) is provided with a gas interface (21) for mixing combustion-supporting air led in by the outer tube (1) and gas led in by the inner tube (2) in the fire outlet end of the outer tube (1) and igniting and burning the mixture, and the energy-saving low-nitrogen burner is characterized by comprising a waste gas resorption structure (3), the waste gas resorption structure (3) comprises a waste gas exhaust device (32) and a heat exchanger (34), the heat exchanger (34) is provided with a first air inlet interface and a first air outlet interface corresponding to the first air inlet interface, the second air inlet interface and a second air outlet interface corresponding to the second air inlet interface, and the first air inlet interface is used, first air-out interface connection waste gas updraft ventilator (32), second air inlet interface connection combustion-supporting gas conveyor (35), second air-out interface connection combustion-supporting gas interface (11), waste gas gets into waste gas updraft ventilator (32) behind heat exchanger (34) and the heat transfer of combustion-supporting gas, waste gas updraft ventilator (32) convey waste gas to with outer tube (1) leading-in combustion-supporting gas, the leading-in gas of inner tube (2) mixes, the burning in the end of going out a fire.

2. The energy-saving low-nitrogen burner as claimed in claim 1, wherein the flue gas recirculation structure (3) comprises a flue gas recirculation pipe (33), the flue gas recirculation pipe (33) penetrates into the inner tube (2), and the flue gas draft device (32) is connected with the first air outlet port through one end of a pipeline and is connected with the flue gas recirculation pipe (33) through the other end of the pipeline.

3. The energy saving low-nitrogen burner according to claim 2, wherein the flame outlet end has a combustion space section (101), the inner tube (2) has an air outlet end, a premix tube (4) is connected to the outer peripheral wall of the air outlet end, and the other end of the premix tube (4) extends to the combustion space section (101).

4. The economizer low-nitrogen burner according to claim 3, characterized in that the outlet end of the inner tube (2) extends to a position adjacent to the premix tube (4) and the flue gas return pipe (33) extends to a position adjacent to the combustion space section (101).

5. The energy-saving low-nitrogen burner according to claim 3, wherein an inner end edge is formed at one end of the premixing tube (4) and fixedly connected with the outer peripheral wall of the air outlet end of the inner tube (2), an outer end edge is formed at the other end of the premixing tube and fixedly connected with the inner peripheral wall of the outer tube (1), a vent hole (41) is formed at the inner end edge so that part of the combustion-supporting air entering the outer tube (1) enters the premixing tube (4), and a vent hole (12) is formed at the outer end edge so that part of the combustion-supporting air entering the outer tube (1) enters the combustion space section (101) for combustion.

6. The utility model provides an energy-conserving low-nitrogen combustion system, includes furnace body (6) and installs the energy-conserving low-nitrogen combustor on furnace body (6), furnace body (6) have furnace, have seted up burner port (61) on the front side oven of furnace body, and the top of furnace body is close to the rear side oven wall and is provided with cigarette window (62) to supply the exhaust combustion exhaust gas in the furnace, its characterized in that: the energy-saving low-nitrogen burner adopts the energy-saving low-nitrogen burner as claimed in any one of claims 1 to 5, and is arranged on the front side furnace wall of the furnace body (6), and the port of the fire outlet end of the outer tube (1) extends into the furnace chamber.