阅读说明：本技术 一种具有倾斜角度稳焰孔的低氮天然气燃烧器 (Low-nitrogen natural gas burner with inclined-angle flame stabilizing holes ) 是由 杜东兴 崔鑫铖 于 2021-09-27 设计创作，主要内容包括：本发明设计一种具有倾斜角度稳焰孔的低氮天然气燃烧器,它包括耐火砖1、第一稳焰孔1.1、第二稳焰孔1.2、Y型气枪2、初级喷嘴2.1、次级喷嘴2.2、外壳3、集气管4、进风口5、喉口板6。耐火砖1固定设置在外壳3的顶部,耐火砖1顶面与侧面开有相互贯通的稳焰孔,稳焰孔分为第一稳焰孔1.1和第二稳焰孔1.2。耐火砖内设置有Y型气枪2,Y型气枪2固定设置在外壳3的底部,Y型气枪2的头部设置有初级喷嘴2.1和次级喷嘴2.2,Y形气枪2的底部与集气管4相连,耐火砖1内中心位置设置喉口板6,喉口板6与耐火砖1的外壳3同轴布置。本发明所述的一种具有倾斜角度稳焰孔的低氮天然气燃烧器,其特征在于：在同等燃烧负荷工况下,所述稳焰孔第二稳焰孔的角度为60°时,与稳焰孔角度为0°的常用低氮天然气燃烧器相比,NO-(x)的排放可降低17.4％。(The invention designs a low-nitrogen natural gas burner with inclined-angle flame-stabilizing holes, which comprises a refractory brick 1, a first flame-stabilizing hole 1.1, a second flame-stabilizing hole 1.2, a Y-shaped air gun 2, a primary nozzle 2.1, a secondary nozzle 2.2, a shell 3, a gas collecting pipe 4, an air inlet 5 and a throat plate 6. The firebrick 1 is fixedly arranged at the top of the shell 3, the top surface and the side surface of the firebrick 1 are provided with mutually communicated flame stabilizing holes which are divided into a first flame stabilizing hole 1.1 and a second flame stabilizing hole 1.2. Be provided with Y type air gun 2 in the resistant firebrick, Y type air gun 2 is fixed to be set up in the bottom of shell 3, and the head of Y type air gun 2 is provided with primary nozzle 2.1 and secondary nozzle 2.2, and the bottom of Y type air gun 2 links to each other with discharge duct 4, and the central point puts in resistant firebrick 1 and sets up throat board 6, and throat board 6 arranges with the shell 3 of resistant firebrick 1 is coaxial. The invention relates to a low-nitrogen natural gas with inclined-angle flame stabilizing holesA burner, characterized by: under the working condition of the same combustion load, when the angle of the second flame stabilizing hole of the flame stabilizing hole is 60 degrees, compared with the common low-nitrogen natural gas burner with the angle of the flame stabilizing hole of 0 degree, NO is added x The emission can be reduced by 17.4%.)

1. The utility model provides a low nitrogen natural gas combustor with stable flame hole of inclination which characterized in that: the flame stabilizing holes are positioned on the top surface and the side surface of the refractory brick of the burner. Each two holes are in a group, the first flame stabilizing hole is communicated downwards from the top surface of the refractory brick, and the second flame stabilizing hole is communicated from the outer side surface of the refractory brick to the inner side surface of the refractory brick and has a certain inclination angle.

2. The low-nitrogen natural gas burner with inclined-angle flame-stabilizing holes according to claim 1, wherein: under the same load working condition, the flame stabilizing holesWhen the angle of the second flame stabilizing hole is 60 degrees, compared with the common low-nitrogen natural gas burner with the flame stabilizing hole of 0 degree, NO is added_xThe emission reduction of (a) can be reduced by 17.4%.

Technical Field

The invention relates to a burner, in particular to a low-nitrogen natural gas burner with inclined-angle flame stabilizing holes, and belongs to the technical field of combustion equipment.

Background

Nitrogen oxides NO produced by natural gas during combustion_xMainly NO and NO₂Wherein NO is very easily reacted with oxygen in the air to generate NO₂。NO₂Then reacts with carbon oxides in the atmosphereGenerating photochemical smog and ozone; photochemical smog has obvious carcinogenic effect, and ozone in the near-formation atmosphere can cause great damage to central nerves, so that NO is visible_xThe elimination of (2) also becomes a hotspot problem in the field of air pollution control.

The new edition of emission Standard of atmospheric pollutants for boilers (GB 13271-2014) requires that the emission quantity of nitrogen oxides of the existing standard is less than or equal to 200mg/m after 4 months and 1 day in 2017 in a gas-fired boiler³Reducing the discharge amount to less than or equal to 80mg/m³。

Therefore, on the basis of the prior art, a rational-structure NO is researched and designed_xLow nitrogen natural gas burners with lower emissions are currently an important issue for the environmental industry.

Disclosure of Invention

The invention designs a low-nitrogen natural gas burner with inclined-angle flame stabilizing holes.

The burner of the invention is characterized in that:

the utility model provides a low nitrogen natural gas combustor with stable flame hole of inclination which characterized in that: the low-nitrogen natural gas burner (figure 1) comprises a refractory brick 1, a first flame stabilizing hole 1.1, a second flame stabilizing hole 1.2, a Y-shaped air gun 2, a primary nozzle 2.1, a secondary nozzle 2.2, a shell 3, a gas collecting pipe 4, an air inlet 5 and a throat plate 6. The firebrick 1 is fixedly arranged at the top of the shell 3, the top surface and the side surface of the firebrick 1 are provided with mutually communicated flame stabilizing holes which are divided into a first flame stabilizing hole 1.1 and a second flame stabilizing hole 1.2. Be provided with Y type air gun 2 in the resistant firebrick, Y type air gun 2 is fixed to be set up in the bottom of shell 3, and the head of Y type air gun 2 is provided with primary nozzle 2.1 and secondary nozzle 2.2, and the bottom of Y type air gun 2 links to each other with discharge duct 4, and the central point puts in resistant firebrick 1 and sets up throat board 6, and throat board 6 arranges with the shell 3 of resistant firebrick 1 is coaxial.

The invention relates to a low-nitrogen natural gas burner with inclined flame stabilizing holes, wherein each two holes of the flame stabilizing holes are in a group, a first flame stabilizing hole 1.1 is formed in the top surface of a refractory brick 1, a second flame stabilizing hole 1.2 is formed in the outer side surface of the refractory brick 1, and the flame stabilizing holes are communicated with the first flame stabilizing hole 1.1 and towards the inner side surface of the refractory brick 1. The second flame stabilizing holes 1.2 are penetrated inwards from the outer side surface of the firebrick 1, the angle of the second flame stabilizing holes 1.2 is 60 degrees (figure 2), 12 groups are arranged, the aperture is 19mm, and the through holes are round holes.

Compared with the prior art, the invention has the beneficial results that:

the invention relates to a low-nitrogen natural gas burner with inclined-angle flame-stabilizing holes, which adopts a special firebrick structure to realize fuel classification, air classification and flue gas recirculation technology. More specifically, the inclined-angle flame stabilizing holes are used for controlling the mixing mode of fuel and air, so that the fuel classification and the air classification are achieved, and the central temperature and NO of the flame are controlled_xAnd (4) discharging.

The invention relates to a low-nitrogen natural gas burner with inclined-angle flame stabilizing holes. When the inclination angle of the flame stabilizing holes is 60 degrees, the angles of the flame stabilizing holes and the spray holes of the secondary nozzle are similar, so that more fuel gas and air outside the refractory brick are mixed. Thereby achieving fuel classification, reducing flame center temperature and NO_xThe generation of (a) plays a significant role.

Drawings

FIG. 1 is an overall structure diagram of a low-nitrogen natural gas burner with inclined-angle flame stabilizing holes according to the invention

FIG. 2 is a structure view of a refractory brick of a low-nitrogen natural gas burner with inclined-angle flame stabilizing holes according to the invention

In the drawings

Refractory brick 1

First flame stabilizing hole 1.1

Second flame stabilizing hole 1.2

Y-shaped air gun 2

Primary nozzle 2.1

Secondary nozzle 2.2

Outer cover 3

Gas collecting pipe 4

Air inlet 5

Throat plate 6

Detailed Description

Referring to fig. 1, the invention relates to a low-nitrogen natural gas burner with inclined-angle flame-stabilizing holes, which comprises a refractory brick 1, a first flame-stabilizing hole 1.1, a second flame-stabilizing hole 1.2, a Y-shaped air gun 2, a primary nozzle 2.1, a secondary nozzle 2.2, a shell 3, a gas collecting pipe 4, an air inlet 5 and a throat plate 6. The firebrick 1 includes first flame stabilizing hole 1.1 and second flame stabilizing hole 1.2, the first flame stabilizing hole 1.1 that has vertical decurrent is opened to the top surface of firebrick 1, and first flame stabilizing hole 1.1 sets up 12 groups, and the aperture is 19mm, and the through-hole is the round hole. The outer side inclined plane of the firebrick 1 is provided with 12 groups of second flame stabilizing holes 1.2, the diameter of the second flame stabilizing holes 1.2 is 19mm, and the through holes are round holes.

The utility model discloses a gas collecting device, including shell 3, resistant firebrick 1, Y type air gun 2, primary nozzle 2.1 and secondary nozzle 2.2, Y type air gun 2 is fixed to be set up at the top of shell 3 in resistant firebrick 1, is provided with Y type air gun 2 in resistant firebrick 1, and Y type air gun 2 is fixed to be set up in the bottom of shell 3, and the head of Y type air gun 2 is provided with primary nozzle 2.1 and secondary nozzle 2.2, and the bottom of Y type air gun 2 links to each other with collecting pipe 4, and resistant firebrick 1 internal center puts and sets up throat board 6, and air intake 5 sets up in the outside or the bottom of shell 3.

The working principle is as follows: air enters the housing 3 through the air inlet 5 and increases in velocity after passing through the throat plate 6. Fuel gas is distributed to each Y-shaped air gun 2 through a gas collecting pipe 4, is sprayed to the furnace chamber through a primary nozzle 2.1 and a secondary nozzle 2.2, and is mixed and combusted with air accelerated through a throat plate 6.

The second flame stabilizing holes 1.2 with the inclination angle of 60 degrees are similar to the spray hole angles of the secondary nozzles 2.2, so that the resistance of the combustion gas passing through the second flame stabilizing holes 2.2 is smaller, more fuel gas is mixed with the air outside the refractory bricks, and the fuel classification is achieved. Under the injection action of the fuel gas, the air accelerated by the throat plate 6 reaches the outer side of the refractory brick 1 through the second flame stabilizing holes 2.2, and the air staged combustion is realized. Because the secondary nozzle 2.2 is positioned in the hearth, under the injection action of the fuel gas, a low-pressure area is generated at the nozzle accessory, low-temperature flue gas at the bottom of the furnace is introduced into a combustion area along the inclined surface of the refractory brick, the flue gas backflow is realized, the central temperature of flame is reduced, and NO is reduced_xAnd (4) generating.

According to the invention, low-nitrogen natural gas burner NO with stable flame holes with different inclination angles under 0.71MW load is obtained through FLUENT software and simulation calculation_xAnd (4) discharging data. As shown in the table I, compared with the common burner with the flame stabilizing holes with the angle of 0 degree, the burner has the flame stabilizing holes with the inclined anglesThe central temperature of the flame of the low-nitrogen natural gas burner is reduced by about 4.8 percent, and NO is reduced_xThe emission is reduced by about 17.4%, and the performance is obviously better than that of a common low-nitrogen natural gas burner.

Angle of rotation	Highest temperature of combustion (K)	NOxDischarge (mg/m)3)
			Common burner (0 degree)	1240	48.175
60	1180	39.77

Table one: burner with flame stabilizing holes inclined at 60 degrees and common low-nitrogen burner flame center temperature and NO_xAnd (5) comparing the discharge amount.