CN211876020U

CN211876020U - Low-nitrogen combustor and low-nitrogen combustion system

Info

Publication number: CN211876020U
Application number: CN201920757192.9U
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: 2020-11-06
Anticipated expiration: 2029-05-23

Abstract

The utility model provides a low-nitrogen burner and low-nitrogen combustion system, the low-nitrogen burner includes outer tube, inner tube and waste gas resorption structure, outer tube one end is the end of getting angry, the other end is the end of getting angry, the end of getting angry is provided with combustion-supporting gas interface, combustion-supporting gas interface is connected with a combustion-supporting gas conveyor, the inner tube penetrates in the outer tube, set up the gas interface on the inner tube, mix in the end of getting angry and igniting burning after the outer tube is angry to the combustion-supporting gas that the inner tube is led into, the waste gas resorption structure includes waste gas updraft ventilator and cold wind device, waste gas updraft ventilator is connected with the exhaust pipe, in order to absorb the waste gas that the furnace discharged, the cold wind device is connected with the exhaust pipe, in order to discharge cold wind and get into the exhaust pipe in order to reduce the temperature of waste gas, waste gas updraft ventilator conveys the waste gas of suction to with the, and burning in the fire outlet end. The utility model discloses low nitrogen combustor can improve its durability.

Description

Low-nitrogen combustor and low-nitrogen combustion system

Technical Field

The utility model relates to a gas boiler low nitrogen combustion technology field, in particular to low nitrogen combustor and 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. In 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 because the exhaust gas temperature is higher.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing, the present invention provides a low-nitrogen burner with improved durability.

The utility model relates to a technical solution:

a low-nitrogen burner comprises an outer tube, an inner tube and a waste gas suck-back 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 combustion-supporting gas interface is connected with a combustion-supporting gas conveying device for conveying combustion-supporting gas to the combustion-supporting gas interface by the combustion-supporting gas conveying device, the inner tube penetrates into the outer tube, the inner tube is provided with a gas interface for mixing combustion-supporting gas led in by the outer tube with gas led in by the inner tube in the fire outlet end of the outer tube and then igniting the mixture, the waste gas suck-back structure comprises a waste gas draft device and a cold air device, the waste gas draft device is connected with an air exhaust pipeline for sucking waste gas discharged by a hearth, the cold air device is connected with the air exhaust pipeline for discharging the cold air to reduce the temperature of the waste gas, the waste gas draft device conveys the, and burning in the fire outlet end.

Furthermore, the cold air device is omitted, and the air exhaust pipeline is connected to the combustion-supporting air conveying device, namely the combustion-supporting air conveying device simultaneously inputs combustion-supporting air to the combustion-supporting air interface and the air exhaust pipeline.

Furthermore, the combustion-supporting gas conveying device adopts a fan, and the combustion-supporting gas is air.

Furthermore, the waste gas resorption structure includes the waste gas back flow pipe, and the waste gas back flow pipe penetrates in the inner tube, and the waste gas back flow pipe is connected waste gas updraft ventilator.

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 a low nitrogen combustion system, includes the furnace body and installs the 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 after the burning in the furnace, the low nitrogen combustor adopt the low nitrogen combustor, it is installed on the front side oven of furnace body, and the port of the play fire end of outer tube stretches into to the furnace in.

This application is through setting up cold wind device, and waste gas self has reduced the temperature, has reduced the temperature that gets into waste gas updraft ventilator waste gas, and protection waste gas updraft ventilator is not damaged by high temperature to, it is lower relatively to get into the interior waste gas temperature of combustion space section, is favorable to reducing the temperature of burning.

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 first embodiment of the low-nitrogen burner of 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 schematic cross-sectional view of a second embodiment of the low-nitrogen burner of the present invention;

FIG. 5 is a perspective view of the low-nitrogen energy-saving combustion system of the present invention;

FIG. 6 is a schematic partial cross-sectional view of a first perspective of the low nitrogen energy efficient combustion system of the present invention;

fig. 7 is a schematic partial sectional view of a second perspective 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 a 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 through an air exhaust pipeline so as to guide out waste gas in the cylinder part and convey the waste gas to the combustion space section in the outer pipe 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.

Waste gas resorption structure 3 further includes cold wind device 36, and air exhaust pipeline is connected to cold wind device 36 for the temperature of cold wind entering air exhaust pipeline waste gas in order to reduce air exhaust pipeline is gone into in the row, has reduced the temperature in the waste gas that gets into waste gas updraft ventilator 32, thereby 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, waste gas updraft ventilator 32's motor burns out easily under the high temperature environment.

Referring to fig. 4, it can be understood that the cold air device 36 may be omitted, the combustion supporting air delivery device 35 adopts a fan to deliver natural air, the combustion supporting air delivery device 35 is connected to the air exhaust pipeline, the combustion supporting air delivery device 35 delivers air to the combustion supporting air port 11 and delivers air to the air exhaust pipeline at the same time, and the temperature of the exhaust gas in the air exhaust pipeline can be reduced.

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. 5 to 7 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 is conveyed into the outer tube barrel 1 from the combustion-supporting gas connector 11, the gas is conveyed into the inner tube barrel 2 from the gas connector 21, 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, an 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 forward, 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, some exhaust 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, pour into cold wind through the cold wind device and mix, get into waste gas updraft ventilator 32, 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 cold wind device 36, and waste gas self has reduced the temperature, has reduced the temperature that gets into waste gas updraft ventilator 32 waste gas, and protection waste gas updraft ventilator 32 is not damaged by high temperature to, it is lower relatively to get into the interior waste gas temperature of combustion space section, is favorable to reducing the temperature of burning.

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 restricted to through 1 play fire end periphery at outer tube section of thick bamboo and sets up waste gas resorption pipe cover 31 and absorb waste gas, also can absorb the waste gas that furnace discharged to smoke window department through the connecting tube, the waste gas of extraction cools down after cold wind device pours into cold wind into, gets into waste gas updraft ventilator 32, waste gas updraft ventilator 32 with waste gas conveying to with the leading-in combustion-supporting gas of outer tube section of thick bamboo 1, the leading-in gas of inner tube section of thick bamboo 2 mixes, the end internal combustion of going out fire.

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. A low-nitrogen burner comprises an outer tube (1) and an inner tube (2), 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 combustion-supporting air interface (11) is connected with a combustion-supporting air conveying device (35) for conveying combustion-supporting air to the combustion-supporting air interface (11) by the combustion-supporting air conveying device (35), 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) and then igniting and burning the mixture in the fire outlet end of the outer tube (1), the low-nitrogen burner is characterized in that the low-nitrogen burner comprises a waste gas resorption structure (3), the waste gas resorption structure (3) comprises a waste gas exhaust device (32) and a cold air device (36), and, be used for absorbing the waste gas that furnace discharged, air exhaust pipeline is connected in cold wind device (36) for discharge into cold wind and get into the temperature of air exhaust pipeline with reduction waste gas, waste gas updraft ventilator (32) with the waste gas conveying of suction to with outer tube (1) leading-in combustion-supporting gas, the leading-in gas of inner tube section of thick bamboo (2) mix, the combustion in the end of appearing the fire.

2. The low-nitrogen burner according to claim 1, wherein the cold air device (36) is omitted and the air extraction duct is connected to the combustion-supporting air delivery device (35), i.e. the combustion-supporting air delivery device (35) simultaneously inputs combustion-supporting air to the combustion-supporting air port (11) and the air extraction duct.

3. The low-nitrogen burner according to claim 1, wherein the combustion-supporting gas delivery device (35) is a blower, and the combustion-supporting gas is air.

4. The 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 interior pipe (2), and the flue gas recirculation pipe (33) is connected with the flue gas draft device (32).

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

6. The low-nitrogen burner as claimed in claim 5, characterized in that the outlet end of the interior tube (2) extends to a position adjacent to the premix tube (4) and the flue gas return line (33) extends to a position adjacent to the combustion space section (101).

7. The low-nitrogen burner according to claim 6, wherein an inner end edge is formed at one end of the premixing tube (4) and fixedly connected with an outer peripheral wall of an 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 an inner peripheral wall of the outer tube (1), a vent hole (41) is formed at the inner end edge so that part of 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 combustion-supporting air entering the outer tube (1) enters the combustion space section (101) to be combusted.

8. The utility model provides a low nitrogen combustion system, includes furnace body (6) and installs the low nitrogen combustor on furnace body (6), and furnace body (6) have furnace, has 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 smoke window (62) to supply the exhaust combustion exhaust gas in the furnace, its characterized in that: the low-nitrogen burner is the low-nitrogen burner in any one of claims 1 to 7, and is installed on the front side wall of the furnace body (6), and the port of the fire outlet end of the outer tube (1) extends into the hearth.