CN113757658A - Low-nitrogen natural gas burner with inclined-angle flame stabilizing holes - Google Patents

Low-nitrogen natural gas burner with inclined-angle flame stabilizing holes Download PDF

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Publication number
CN113757658A
CN113757658A CN202111135147.8A CN202111135147A CN113757658A CN 113757658 A CN113757658 A CN 113757658A CN 202111135147 A CN202111135147 A CN 202111135147A CN 113757658 A CN113757658 A CN 113757658A
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CN
China
Prior art keywords
flame
flame stabilizing
natural gas
low
angle
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CN202111135147.8A
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Chinese (zh)
Inventor
杜东兴
崔鑫铖
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Qingdao University of Science and Technology
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Qingdao University of Science and Technology
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Priority to CN202111135147.8A priority Critical patent/CN113757658A/en
Publication of CN113757658A publication Critical patent/CN113757658A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

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 addedxThe emission can be reduced by 17.4%.

Description

Low-nitrogen natural gas burner with inclined-angle flame stabilizing holes
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 combustionxMainly 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 visiblexThe 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 designedxLow 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 controlledxAnd (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 NOxThe 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 reducedxAnd (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 calculationxAnd (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 reducedxThe 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 NOxAnd (5) comparing the discharge amount.

Claims (2)

1.一种具有倾斜角度稳焰孔的低氮天然气燃烧器，其特征在于：所述稳焰孔位于燃烧器耐火砖顶面与侧面。每两个孔为一组，第一稳焰孔由耐火砖顶面向下贯通，第二稳焰孔由耐火砖外侧面向内侧面贯通，具有一定的倾斜角度。1. A low-nitrogen natural gas burner with an inclined angle flame stabilization hole, characterized in that: the flame stabilization hole is located on the top surface and the side surface of the refractory brick of the burner. Each two holes is a group, the first flame stabilization hole is penetrated downward from the top surface of the refractory brick, and the second flame stabilization hole is penetrated from the outer side of the refractory brick to the inner side surface, and has a certain inclination angle. 2.根据权利要求1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，与稳焰孔为0°的常用低氮天然气燃烧器相比，NOx的排放降低可降低17.4％。2. The low-nitrogen natural gas burner with an inclined angle flame stabilization hole according to claim 1, characterized in that: under the same load condition, the angle of the second flame stabilization hole of the flame stabilization hole is 60° When compared with the common low-nitrogen natural gas burner with a flame stabilization hole of 0°, the NOx emission reduction can be reduced by 17.4%.
CN202111135147.8A 2021-09-27 2021-09-27 Low-nitrogen natural gas burner with inclined-angle flame stabilizing holes Pending CN113757658A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111135147.8A CN113757658A (en) 2021-09-27 2021-09-27 Low-nitrogen natural gas burner with inclined-angle flame stabilizing holes

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Application Number Priority Date Filing Date Title
CN202111135147.8A CN113757658A (en) 2021-09-27 2021-09-27 Low-nitrogen natural gas burner with inclined-angle flame stabilizing holes

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117490064A (en) * 2023-12-05 2024-02-02 瓦兰热能设备(无锡)有限公司 Low-nitrogen environment-friendly burner combustion head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117490064A (en) * 2023-12-05 2024-02-02 瓦兰热能设备(无锡)有限公司 Low-nitrogen environment-friendly burner combustion head

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