CN210921371U

CN210921371U - Low NO of common air boxXGas burner

Info

Publication number: CN210921371U
Application number: CN201920947181.7U
Authority: CN
Inventors: 沈玲玲; 王善荣
Original assignee: Heshuo Zhangjiagang Thermal Energy Equipment Co ltd
Current assignee: Heshuo Zhangjiagang Thermal Energy Equipment Co ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-07-03
Anticipated expiration: 2029-06-21

Abstract

The utility model discloses a low NO of sharing bellows_XThe gas burner comprises a burner mounting plate arranged on the rear end surface of the common air box, an outer flame tube is arranged at the front end of the burner mounting plate,the front end of outer flame tube is uncovered and stretches into furnace, establish the first air intake of taking first air door baffle in the rear end of outer flame tube, the inside clearance cover of outer flame tube is equipped with interior flame tube, be equipped with the second air intake of taking second air door baffle on the rear end lateral wall of inner flame tube, inside including flame tube is provided with burning torch and inboard gas gun, the front end cover at burning torch is equipped with interior swirler, the front end cover of inner flame tube is equipped with outer swirler, it has a plurality of outside gas guns to distribute along circumference interval between the inner wall of outer swirler and outer flame tube, the gas flow direction of outside gas gun blowout gas, the soon of outer swirler, and the soon of interior swirler is same direction. The advantages are that: the fuel gas and the combustion air can be fully and uniformly mixed, and the emission of nitrogen oxides is effectively inhibited.

Description

Low NO of common air boxXGas burner

Technical Field

The utility model relates to a combustion apparatus technical field, concretely relates to low NO of common bellows that is arranged in large-scale power boiler in fields such as electric power, oil, chemical industry_XA gas burner.

Technical Field

At present, emission standards of atmospheric pollutants of boilers are established in many parts of China, and nitrogen oxides (NOx) are required to be controlled within 30mg/Nm or 50mg/Nm in dry labor and year harvesting. Common air box low NO_XBurners are the most commonly used and most economical low NO_XCombustion technology. However, the gas burners used in China at present all have the defects of nonuniform mixing of gas and combustion air, nonuniform combustion temperature, incapability of effectively inhibiting the generation amount of nitrogen oxides and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a low NO of sharing bellows that enables gas and combustion air intensive mixing even_XA gas burner.

In order to achieve the above purpose, the utility model adopts the following technical scheme: low NO of common air box_XGas burner, including installing in the combustor mounting panel of common bellows rear end face, the front end of combustor mounting panel is provided with outer flame tube, the front end of outer flame tube is uncovered and stretches into furnace behind passing common bellows and the furnace wall, be provided with the first air intake that is linked together with common bellows on the rear end lateral wall of outer flame tube, be provided with the first air door baffle that is used for adjusting first air intake aperture in first air intake department, the inside clearance cover at outer flame tube is equipped with the open interior flame tube of front end, the rear end of inner flame tube is equipped withBe provided with the second air intake on the lateral wall, be provided with the second air door baffle that is used for adjusting the second air intake in second air intake department, inside including the flame tube is provided with burning torch and the inboard gas gun of installing on the combustor mounting panel, at the front end cover of burning torch and be equipped with interior swirler, leave the overfire clearance between the inner wall of interior swirler and interior flame tube, the front end cover of flame tube is equipped with outer swirler including, leave the overfire clearance between the inner wall of outer swirler and outer flame tube, it has a plurality of outside gas guns of installing in the combustor mounting panel to distribute along circumference interval between the inner wall of outer swirler and outer flame tube, the gas flow direction of outside gas gun blowout gas, the direction of rotation of outer swirler and the direction of rotation of interior swirler are same direction.

Further, the common air box is low in NO_XA gas burner, wherein: the outside gas gun includes that a plurality of shower nozzle angles are 45 degrees outside 45 degrees gas guns and a plurality of shower nozzle angles are 70 degrees outside 70 degrees gas guns, and outside 45 degrees gas guns is along the same graduated circle of the even interval alternate installation of circumference in the combustor mounting panel with 70 degrees gas guns in the outside.

Further, the common air box is low in NO_XA gas burner, wherein: the blade angle of the inner swirler is 45 degrees and the blade angle of the outer swirler is 30 degrees.

Further, the common air box is low in NO_XA gas burner, wherein: a first UV flame detector for detecting ignition flame is arranged at the rear end of the ignition gun, and a second UV flame detector for detecting main ignition flame is arranged on the burner mounting plate.

Further, the common air box is low in NO_XA gas burner, wherein: and a clamping sleeve type manual ball valve for adjusting the flow of each gas gun is respectively arranged on each outer gas gun.

Further, the common air box is low in NO_XA gas burner, wherein: a plurality of air holes communicated with the hearth and the inner part of the outer flame tube are formed in the side wall of the front end of the outer flame tube on the rear side of the outer swirler along the circumferential direction.

Through the implementation of the above technical scheme, the beneficial effects of the utility model are that: (1) because the gas flow direction of the gas sprayed by the outer gas gun, the rotating direction of the outer swirler and the rotating direction of the inner swirler are in the same direction, the gas and the combustion air can be fully and uniformly mixed, the combustion temperature is more uniform, and the emission of nitrogen oxides is effectively inhibited; (2) the front end of the outer flame tube is provided with the air hole, so that cold flue gas in the hearth can be mixed into combustible mixed gas from the air hole and then fed into the hearth for combustion, and the internal circulation of the flue gas is realized, thereby reducing the flame temperature of a combustion area and further effectively inhibiting the emission of nitrogen oxides.

Drawings

FIG. 1 shows a low NO of a common air box of the present invention_XThe structure of the gas burner is schematically shown.

Fig. 2 is a schematic diagram of the left-side view of fig. 1.

Fig. 3 is a schematic view of the structure in the right-hand direction of fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in figures 1, 2 and 3, the common bellows is low in NO_XA gas burner comprises a burner mounting plate 2 arranged on the rear end surface of a common air box 1, an outer flame tube 3 is arranged at the front end of the burner mounting plate 2, the front end of the outer flame tube 3 is open and penetrates through the common air box 1 and a furnace wall 4 to extend into a furnace chamber, a first air inlet communicated with the common air box 1 is arranged on the rear end side wall of the outer flame tube 3, a first air door baffle 5 used for adjusting the opening degree of the first air inlet is arranged at the first air inlet, an inner flame tube 6 with an open front end is sleeved in a gap inside the outer flame tube 3, a second air inlet is arranged on the rear end side wall of the inner flame tube 6, a second air door baffle 7 used for adjusting the second air inlet is arranged at the second air inlet, an ignition gun 8 and an inner side gas gun 9 which are arranged on the burner mounting plate 2 are arranged inside the inner flame tube 6, an inner swirler 10 is sleeved at the front end of the ignition gun 8, an air gap is reserved between the inner swirler 10 and the inner wall of the inner flame tube 6, an outer swirler 11 is sleeved at the front end of the inner flame tube 6, and the outer swirler is sleeved outsideAn overfire air gap is reserved between the cyclone 11 and the inner wall of the outer flame tube 3, a plurality of outer gas guns mounted on the burner mounting plate 2 are circumferentially distributed at intervals between the outer cyclone 11 and the inner wall of the outer flame tube 3, in the embodiment, each outer gas gun comprises a plurality of outer 45-degree gas guns 121 with 45-degree nozzle angles and a plurality of outer 70-degree gas guns 122 with 70-degree nozzle angles, and the outer 45-degree gas guns 121 and the outer 70-degree gas guns 122 are circumferentially and uniformly alternately mounted on the same reference circle of the burner mounting plate 2 at intervals; the gas flow direction of the gas sprayed by the outer 45-degree gas gun 121, the gas flow direction of the gas sprayed by the outer 70-degree gas gun 122, the rotating direction of the outer swirler 11 and the rotating direction of the inner swirler 10 are in the same direction, so that the gas and the combustion air can be fully and uniformly mixed, the combustion temperature is more uniform, and the emission of nitrogen oxides is effectively inhibited; in the embodiment, the blade angle of the inner swirler 10 is 45 degrees, mainly used for stabilizing the flame of the central gas gun, and belongs to the peroxide combustion area, and the blade angle of the outer swirler 11 is 30 degrees, mainly used for enhancing the mixing of the outer gas gun and the outer swirling air, and belongs to the oxygen deficiency combustion, so that the low-nitrogen combustion is realized; the angle design of the blades of the inner and outer swirlers can ensure that the fuel gas and the combustion air are further fully and uniformly mixed, the combustion temperature is more uniform, and the emission of nitrogen oxides is further effectively inhibited;

in the present embodiment, a first UV flame detector 13 for detecting an ignition flame is provided at the rear end of the ignition gun 8, and a second UV flame detector 14 for detecting a main ignition flame is provided on the burner mounting plate 2, which can improve the safety of the burner in use; in the embodiment, a cutting sleeve type manual ball valve 15 for adjusting the flow of each gas gun is respectively arranged on each outer gas gun, so that the operation is more convenient; in the embodiment, a plurality of air holes 16 which are communicated with the hearth and the inner part of the outer flame tube are circumferentially arranged on the side wall of the front end of the outer flame tube 3 at the rear side of the outer swirler 11, so that cold flue gas in the hearth can be mixed with combustible mixed gas again from the air holes 16 and then supplied to the hearth for combustion, and internal circulation of the flue gas is realized, so that the flame temperature of a combustion area is reduced, and the emission of nitrogen oxides is further effectively inhibited;

the working principle of the utility model is as follows:

when the combined air box is used, combustion-supporting air in the common air box 1 enters the outer flame tube 3 through the first air inlet, the combustion-supporting air entering the outer flame tube 3 is partially sprayed into a hearth through the outer swirler 11 to form primary cyclone air, a part of the combustion-supporting air enters the inner flame tube 6 through the second air inlet, the combustion-supporting air entering the inner flame tube 6 is partially sprayed into the hearth through the inner swirler 10 to form secondary cyclone air, a part of the combustion-supporting air forms secondary cyclone air through the inner swirler 10 and is sprayed into the hearth through the inner swirler 6, a part of the combustion-supporting air forms secondary direct air through a gap between the inner swirler 10 and the inner wall of the inner flame tube 6 to be sprayed into the hearth, and gas is sprayed into the outer flame tube 3 through the inner gas gun 9, the outer 45-degree gas gun 121 and the outer 70-degree gas gun 122 and is sprayed into the hearth through the outer flame tube 3, and the combustion-supporting air and; in the combustion process, cold flue gas in the hearth enters the outer flame tube 3 from the air hole 16, is mixed with combustion air and fuel gas in the outer flame tube 3 again and then is supplied to the hearth for combustion, and the internal circulation of the flue gas is realized, so that the flame temperature of a combustion area is reduced, and the emission of nitrogen oxides is further effectively inhibited; in the combustion process, the flow direction of the gas ejected from the outer 45-degree gas gun 121, the flow direction of the gas ejected from the outer 70-degree gas gun 122, the rotation direction of the outer swirler 11 and the rotation direction of the inner swirler 10 are always in the same direction, so that the gas and the combustion air can be fully and uniformly mixed, the combustion temperature is more uniform, and the emission of nitrogen oxides is effectively inhibited.

The utility model has the advantages that: (1) because the gas flow direction of the gas sprayed by the outer gas gun, the rotating direction of the outer swirler and the rotating direction of the inner swirler are in the same direction, the gas and the combustion air can be fully and uniformly mixed, the combustion temperature is more uniform, and the emission of nitrogen oxides is effectively inhibited; (2) the front end of the outer flame tube is provided with the air hole, so that cold flue gas in the hearth can be mixed into combustible mixed gas from the air hole and then fed into the hearth for combustion, and the internal circulation of the flue gas is realized, thereby reducing the flame temperature of a combustion area and further effectively inhibiting the emission of nitrogen oxides.

Claims

1. Low NO of common air box_XGas burner, its characterized in that: the novel gas burner comprises a burner mounting plate arranged on the rear end face of a common air box, wherein an outer flame tube is arranged at the front end of the burner mounting plate, the front end of the outer flame tube is open and penetrates through the common air box and a furnace wall to extend into a hearth, a first air inlet communicated with the common air box is arranged on the side wall of the rear end of the outer flame tube, a first air door baffle plate used for adjusting the opening degree of the first air inlet is arranged at the first air inlet, an inner flame tube with an open front end is sleeved on the inner gap of the outer flame tube, a second air inlet is arranged on the side wall of the rear end of the inner flame tube, a second air door baffle plate used for adjusting the second air inlet is arranged at the second air inlet, an ignition gun and an inner gas gun which are arranged on the burner mounting plate are arranged inside the inner flame tube, an inner swirler is sleeved at the front end of the ignition gun, and an overfire gap is reserved, the front end cover of inner flame tube is equipped with outer swirler, leaves the air gap between the inner wall of outer swirler and outer flame tube, has a plurality of outside gas guns of installing in the combustor mounting panel along circumference interval distribution between the inner wall of outer swirler and outer flame tube, the gas flow direction of outside gas gun blowout gas, the soon of outer swirler to and the soon of inner swirler to be the same direction.

2. Common bellows low NO according to claim 1_XGas burner, its characterized in that: the outside gas gun includes that a plurality of shower nozzle angles are the outside 45 degrees gas gun of 45 degrees and a plurality of shower nozzle angles are 70 degrees outside 70 degrees gas gun, and the even interval in circumference is installed in the same graduated circle of combustor mounting panel in turn with outside 70 degrees gas gun in outside 45 degrees gas gun in outside.

3. Common bellows low NO according to claim 1_XGas burner, its characterized in that: the blade angle of the inner swirler is 45 degrees and the blade angle of the outer swirler is 30 degrees.

4. A common bellows according to claim 1Low NO_XGas burner, its characterized in that: a first UV flame detector for detecting ignition flame is arranged at the rear end of the ignition gun, and a second UV flame detector for detecting main ignition flame is arranged on the burner mounting plate.

5. Common bellows low NO according to claim 1_XGas burner, its characterized in that: and a clamping sleeve type manual ball valve for adjusting the flow of each gas gun is respectively arranged on each outer gas gun.

6. Common bellows low NO according to claim 1_XGas burner, its characterized in that: a plurality of air holes communicated with the hearth and the inner part of the outer flame tube are formed in the side wall of the front end of the outer flame tube on the rear side of the outer swirler along the circumferential direction.