CN111023089A - Low nitrogen premixed flue gas internal circulation gas burner - Google Patents

Low nitrogen premixed flue gas internal circulation gas burner Download PDF

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Publication number
CN111023089A
CN111023089A CN201911276422.0A CN201911276422A CN111023089A CN 111023089 A CN111023089 A CN 111023089A CN 201911276422 A CN201911276422 A CN 201911276422A CN 111023089 A CN111023089 A CN 111023089A
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gas
pipe
nozzle
premixed
outer ring
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CN111023089B (en
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周国平
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Wuxi Shunmeng Science & Technology Co ltd
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Wuxi Shunmeng Science & Technology Co ltd
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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
    • 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
    • F23D14/48—Nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/26—Details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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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 patent provides a low-nitrogen premixed flue gas internal circulation gas burner which is small in size, compact in structure, free of backfire and stable in combustion, and comprises a shell with an air channel, wherein a central gas pipe is arranged in the front end of the air channel, each premixed nozzle is arranged at the front end of one premixed nozzle, the rear end of each premixed nozzle is communicated with an air transition pipe and a gas transition pipe, the other end of each air transition pipe is communicated with the premixed air channel, and the other end of each gas transition pipe is communicated with the premixed gas channel; the conical flame tube is coaxial with the central gas tube and is positioned at the front part of the air channel; an annular gap is formed between the conical flame tube and the outlet of the air channel, and a plurality of premixing nozzles are uniformly distributed in the annular gap; each outer ring nozzle is arranged on an outer ring gas pipe surrounding the periphery of the shell; the central gas pipe, the premixed gas channel and the outer ring gas channel are communicated with a gas source through a gas supply pipeline provided with a regulating valve; the premixing air channel is communicated with a compressed air source; the air passage is communicated with the outlet of the blower.

Description

Low-nitrogen premixed flue gas internal circulation gas burner
Technical Field
This patent relates to gas burners, in particular low nitrogen gas burners.
Background
The emission concentration limit value of nitrogen oxide of atmospheric pollutants of a newly built boiler in 4 months and 1 day in 2017 is 30mg/m3According to the detection statistical analysis result of national gas industrial boilers, wherein NOXThe mass concentration of the discharged matter is less than or equal to 200mg/m3Of the boiler onlyThe nitrogen oxide content is 35 percent, and the excessive nitrogen oxide content is mainly caused by that a gas burner does not adopt a low-nitrogen combustion technology or only adopts a staged combustion control technology in the initial step.
In order to achieve low-nitrogen combustion, the FGR flue gas recirculation technology is often used, where a 15-25% proportion of flue gas is supplied to the combustion process, which lowers the flame temperature and thereby the Nox value. The flue gas at the tail part of the boiler is introduced into the whole air inlet path through the fan, the flue gas is put into the combustor again for combustion, the surface temperature of the flame is reduced, the increased flue gas can absorb the temperature of the flame, and because 15-25% of the flue gas is put into the combustor in a large proportion, the heat efficiency of the boiler is affected, and the energy consumption is increased.
Disclosure of Invention
The purpose of this patent is to provide a low nitrogen gas internal recycle gas burner in advance that nitrogen oxide emission concentration is lower, its small, compact structure, can not temper, the combustion is stable, and it adopts specific structure rather than adopting FGR technique to reduce nitrogen oxide concentration.
The low-nitrogen premixed flue gas internal circulation gas burner comprises a shell with an air channel inside, a central gas pipe is arranged at the center of an outlet at the front end of the air channel, and the low-nitrogen premixed flue gas internal circulation gas burner also comprises a plurality of premixed nozzles and a plurality of outer ring nozzles; each premixing nozzle is arranged at the front end of one premixing spray pipe, the rear end of each premixing spray pipe is simultaneously communicated with an air transition pipe and a gas transition pipe, the other end of each air transition pipe is communicated with a premixing air channel fixed at the rear end of the shell, and the other end of each gas transition pipe is communicated with a premixing gas channel fixed at the rear end of the shell; the conical flame tube with a small front end and a large rear end is coaxial with the central gas tube and is positioned at the front part of the air channel; the diameter of the rear end of the conical flame tube is smaller than the inner diameter of the outlet of the air channel, an annular gap is formed between the outer periphery of the rear end of the conical flame tube and the inner periphery of the outlet of the air channel, and the plurality of premixing nozzles are uniformly distributed in the annular gap;
each outer ring nozzle is arranged on an outer ring gas pipe surrounding the periphery of the shell, the outer ring nozzles are positioned behind the premixing nozzles in the axis direction of the air channel outlet, and the outer ring gas pipe is communicated with the outer ring gas channel arranged on the periphery of the shell through an outer ring transition pipe which backwards penetrates through the refractory ring; the fire-resistant ring is arranged on the periphery of the front end of the shell;
the central gas pipe, the premixed gas channel and the outer ring gas channel are respectively communicated with a gas source through gas supply pipelines, and each gas supply pipeline is provided with an adjusting valve; the premixing air channel is communicated with a compressed air source; the air channel is communicated with the outlet of the blower; the pressure of gas entering the premixing gas channel from the gas source is higher than that of gas in the central gas pipe and the outer ring gas channel.
As a further improvement to the low-nitrogen premixed flue gas internal circulation gas burner, the low-nitrogen premixed flue gas internal circulation gas burner further comprises a plurality of inner ring nozzles; each inner ring nozzle is arranged on an inner ring gas pipe surrounding the periphery of the shell, the inner ring nozzles are positioned between the outer ring nozzles and the premixing nozzles in the axial direction of the outlet of the air channel, and the outer ring nozzles are positioned on the periphery of the inner ring nozzles in the radial direction of the outlet of the air channel; the inner ring gas pipe is communicated with an inner ring gas channel arranged on the periphery of the shell through an inner ring transition pipe which backwards penetrates through the refractory ring; the central gas pipe, the premixed gas channel, the outer ring gas channel and the inner ring gas channel are respectively communicated with a gas source through gas supply pipelines.
As a further improvement of the low-nitrogen premixed flue gas internal circulation gas burner, the front end face of the fire-resistant ring is in a step shape, and the outer ring gas pipe and the inner ring gas pipe are arranged at different steps of the fire-resistant ring.
As a further improvement of the low-nitrogen premixed flue gas internal circulation gas burner, an inner ring gas outlet serving as an inner ring nozzle is formed in the inner ring gas pipe.
As a further improvement of the low-nitrogen premixed flue gas internal circulation gas burner, an outer ring gas outlet serving as an outer ring nozzle is formed in the outer ring gas pipe.
As a further improvement to the low-nitrogen premixed gas internal circulation gas burner, the axis of the premixing nozzle is 35-65 degrees to the axis of the outlet of the air channel.
The beneficial effect of this patent:
the high-pressure compressed air and the premixed gas are premixed and sprayed out through the annular gap through the premixing nozzle for combustion. Mixed compressed air andthe pressure of the premixed gas is high, the premixed gas can suck air around to burn when being sprayed out, and the premixed gas and the air are premixed, so that the temperature of flame is uniform, the retention time of the gas in a high-temperature area is shortened, and the burning temperature is greatly reduced. Meanwhile, the outer ring air nozzle and the inner ring air nozzle which are positioned on the periphery of the shell form a plurality of small air flows on the periphery of the shell, so that the flame diffusion jet speed is improved, and the entrainment effect on low-temperature flue gas near the outer ring air nozzle and the inner ring air nozzle can be achieved; the conical flame tube is small in front and large in back, the entrainment capacity of main flame generated by burning central gas sprayed from the front end of the central gas tube to low-temperature flue gas around the front end of the conical flame tube is enhanced, and the temperature peak value of the flame can be uniformly reduced. This patent can be said to be a premix flue gas inner loop technique, and it adopts this structure for part flue gas backward flow participates in the burning, reduces flame temperature, effectively reduces the Nox value, makes nitrogen oxide concentration be less than 30mg/m3。
The gas in the central gas pipe is sprayed out by the central nozzle, meanwhile, the axis of the premixing nozzle and the axis of the outlet of the air channel form 35-65 degrees, the gas burner forms diffusion type combustion, has small volume and compact structure, can not be tempered, has stable flame, and ensures the stability of the whole combustion.
Of course, each gas supply pipeline is provided with a regulating valve, such as a pressure regulating valve and a flow regulating valve, and even can control the opening degree of each regulating valve through a servo motor, and then the gas pressure, the flow and the like on the gas supply pipeline are controlled, which belongs to the prior art and is not described again. The air outlet of the blower can be provided with an adjustable air door, and the motor of the blower can adjust the air flow in the air channel by the prior art means such as an air flow servo motor and the like.
Certainly, the gas burner can also comprise a controller, and an ignition device, a flame monitoring device, a temperature control device and the like which belong to the conventional technical means can be arranged on the shell; the output end of the controller is connected with the input end of the ignition device and is used for controlling the ignition device to be turned on and off; the output end of the flame monitoring device is connected with the input end of the controller and is used for sending the detected flame combustion signal to the controller; the output end of the temperature control device is connected with the input end of the controller and used for transmitting the temperature signal in the shell to the controller. And each servo motor, each servo motor feedback and the like are also respectively connected with the controller.
Drawings
FIG. 1 is a perspective view of a low nitrogen premixed flue gas internal circulation gas burner;
FIG. 2 is another perspective view of a low nitrogen premixed flue gas internal circulation gas burner;
FIG. 3 is a top view of a low nitrogen premixed flue gas internal circulation gas burner;
FIG. 4 is a front view of a low nitrogen premixed flue gas internal circulation gas burner;
FIG. 5 is a side view of a low nitrogen premixed flue gas inner circulation gas burner;
FIG. 6 is an enlarged view of the outer ring gas pipe, the outer ring nozzle, etc.
In the figure, a shell 1, a conical flame tube 11, an annular gap 12, a flame ring 2, an ignition device 7,
a central gas pipe 3, a central gas inlet 36,
a premixing nozzle 41, a premixing nozzle 4, an air transition pipe 42, a premixing air passage 43, a gas transition pipe 44, a premixing gas passage 45, a premixing gas inlet 46, a premixing air inlet 47,
an outer ring gas pipe 5, an outer ring nozzle 51, an outer ring transition pipe 52, an outer ring hose 53, an outer ring gas channel 55, an outer ring gas inlet 56,
an inner ring gas pipe 6, an inner ring nozzle 61, an inner ring transition pipe 62, an inner ring hose 63, an inner ring gas channel 65, an inner ring gas inlet 66,
an air channel 100, an air channel inlet 101, an air channel outlet 102.
Detailed Description
Referring to fig. 1, 2 and 4, the low-nitrogen premixed gas internal circulation gas burner comprises a shell 1 with an air channel 100 inside, and a refractory ring 2 arranged on the periphery of the front end of the shell; the front end surface of the refractory ring is step-shaped. The rear of the air passage 100 is an air passage inlet 101 opened at the side of the housing, and the air passage inlet 101 communicates with the blower outlet. At the front end of the air passage outlet 102 is located at the front end of the housing.
The central gas pipe 3 has a rear end passing through the rear of the housing and a front end located at the center of the air passage outlet 102.
Referring to fig. 2, 3 and 5, each premixing nozzle 41 is disposed at the front end of one premixing nozzle 4, the rear end of each premixing nozzle 4 is communicated with an air transition pipe 42 and a gas transition pipe 44, the other end of each air transition pipe 42 is communicated with a premixing air passage 43 fixed at the rear end of the casing, and the other end of each gas transition pipe 44 is communicated with a premixing gas passage 45 fixed at the rear end of the casing.
The conical flame tube 11 with a small front end and a large rear end is coaxial with the central gas tube and is positioned in front of the outlet of the air channel.
The diameter of the rear end of the conical flame tube is smaller than the inner diameter of the outlet of the air channel, an annular gap 12 is formed between the outer periphery of the rear end of the conical flame tube and the inner periphery of the outlet of the air channel, and the plurality of premixing nozzles 41 are uniformly distributed in the annular gap.
The outer ring gas pipe 5 and the inner ring gas pipe 6 are arranged at different steps of the fire-resistant ring. The outer ring gas pipe 5 is provided with a plurality of outer ring gas outlets as outer ring nozzles 51.
The inner ring gas pipe 6 is provided with a plurality of inner ring gas outlets as inner ring nozzles 61.
The premixing nozzles 41, the outer ring nozzles 51, and the inner ring nozzles 61 are all arranged in the circumferential direction with the air passage outlet axis as the center line. The axis of the outlet of the premixing nozzle 41 is at about 45 to the axis of the outlet of the air passage.
Referring to fig. 6, the inner ring nozzle 61 is located rearward of the premix nozzle 41 in the axial direction of the air passage outlet, and the outer ring nozzle 51 is located rearward of the inner ring nozzle 61. The outer ring nozzle 51 is located at the outer periphery of the inner ring nozzle 61 in the radial direction of the air passage outlet.
Referring to fig. 2 and 3, the outer ring gas pipe 5 communicates with an outer ring gas passage 55 provided at the outer periphery of the middle portion of the casing through an outer ring transition pipe 52, an outer ring hose 53, and the like, which pass through the refractory ring rearward.
The inner ring gas pipe 6 is communicated with an inner ring gas channel 65 arranged at the periphery of the middle part of the shell through an inner ring transition pipe 62, an inner ring hose 63 and the like which pass through the fire-resistant ring backwards.
Referring to fig. 1 and 2, the central gas pipe 3, the premixed gas channel 45, the outer ring gas channel 55, the central gas inlet 36, the premixed gas inlet 46, the outer ring gas inlet 56, and the inner ring gas inlet 66 on the inner ring gas channel 65 are respectively communicated with a gas source through gas supply pipelines, and each gas supply pipeline is provided with a regulating valve. The gas pressure in the central gas pipe, the outer ring gas channel and the inner ring gas channel is basically the same. The pressure of the gas entering the premixed gas channel from the gas source is higher than the pressure of the gas in the central gas pipe.
The premix air inlet 47 on the premix air passage 43 communicates with a compressed air source.
The patent provides a low-nitrogen gas burner, adopts drainage backward flow technique, draws to penetrate backward flow technique etc. and makes the nitrogen oxide in the exhaust tail gas reach 30mg/m3The air door and the gas flow ratio, the fan and each regulating valve are respectively and independently controlled automatically, the operation is simple, the maintenance is convenient, the service life of parts is long, and the energy consumption is low.

Claims (6)

1.低氮预混烟气内循环燃气燃烧器，包括内部具有空气通道的壳体，在空气通道的前端出口中心部具有中心燃气管，其特征是：它还包括多个预混喷嘴和多个外环喷嘴；每个预混喷嘴设置在一个预混喷管的前端，每个预混喷管后端同时与空气过渡管和燃气过渡管相通，各空气过渡管的另一端与固定在壳体后端的预混空气通道相通，各燃气过渡管的另一端与固定在壳体后端的预混燃气通道相通；前端小后端大的锥形火焰管与中心燃气管同轴，并位于空气通道的前部；锥形火焰管后端直径小于空气通道出口内径，锥形火焰管后端外周与空气通道出口内周之间有环形缝隙，多个预混喷嘴均布在环形缝隙处；1. The low-nitrogen premixed flue gas internal circulation gas burner includes a shell with an air channel inside, and a central gas pipe in the center of the front end outlet of the air channel, characterized in that it also includes a plurality of premix nozzles and a plurality of Outer ring nozzles; each premixing nozzle is arranged at the front end of a premixing nozzle, the rear end of each premixing nozzle is communicated with the air transition pipe and the gas transition pipe at the same time, and the other end of each air transition pipe is connected with the The premixed air passage at the rear end of the body is communicated, and the other end of each gas transition pipe is communicated with the premixed gas passage fixed at the rear end of the shell; the conical flame pipe with a small front end and a large rear end is coaxial with the central gas pipe and located in the air passage. The diameter of the rear end of the conical flame tube is smaller than the inner diameter of the outlet of the air channel, there is an annular gap between the outer circumference of the rear end of the conical flame tube and the inner circumference of the outlet of the air channel, and a plurality of premixing nozzles are evenly distributed at the annular gap; 各外环喷嘴设置在环绕壳体外周的外环燃气管上，在空气通道出口的轴线方向上外环喷嘴位于预混喷嘴的后方，外环燃气管通过向后穿过耐火环的外环过渡管与设置在壳体外周的外环燃气通道相通；耐火环设置在壳体前端外周；Each outer ring nozzle is arranged on the outer ring gas pipe surrounding the outer circumference of the casing. The outer ring nozzle is located behind the premix nozzle in the axial direction of the air channel outlet, and the outer ring gas pipe passes through the outer ring of the refractory ring. The pipe is communicated with the outer ring gas channel arranged on the outer periphery of the casing; the refractory ring is arranged on the outer periphery of the front end of the casing; 中心燃气管、预混燃气通道、外环燃气通道分别通过供气管路与燃气源相连通，各供气管路上均设置有调节阀；预混空气通道与压缩空气源相通；空气通道与鼓风机出口相通；从燃气源进入预混燃气通道内的燃气压力高于中心燃气管、外环燃气通道内的燃气压力。The central gas pipe, the premixed gas channel and the outer ring gas channel are respectively connected with the gas source through the gas supply pipeline, and each gas supply pipeline is provided with a regulating valve; the premixed air channel is communicated with the compressed air source; the air channel is communicated with the blower outlet ; The gas pressure entering the premixed gas channel from the gas source is higher than the gas pressure in the central gas pipe and the outer ring gas channel. 2.如权利要求1所述的低氮预混烟气内循环燃气燃烧器，其特征是：它还包括多个内环喷嘴；各内环喷嘴设置在环绕壳体外周的内环燃气管上，在空气通道出口的轴线方向上内环喷嘴位于外环喷嘴与预混喷嘴之间，在空气通道出口的径向方向上外环喷嘴位于内环喷嘴外周；内环燃气管通过向后穿过耐火环的内环过渡管与设置在壳体外周的内环燃气通道相通；中心燃气管、预混燃气通道、外环燃气通道、内环燃气通道分别通过供气管路与燃气源相连通。2. The low-nitrogen premixed flue gas internal circulation gas burner according to claim 1, characterized in that: it further comprises a plurality of inner ring nozzles; each inner ring nozzle is arranged on the inner ring gas pipe surrounding the outer periphery of the casing , the inner ring nozzle is located between the outer ring nozzle and the premix nozzle in the axial direction of the air channel outlet, and the outer ring nozzle is located on the outer circumference of the inner ring nozzle in the radial direction of the air channel outlet; The inner ring transition pipe of the refractory ring communicates with the inner ring gas channel arranged on the outer periphery of the shell; the central gas pipe, the premixed gas channel, the outer ring gas channel and the inner ring gas channel are respectively connected with the gas source through the gas supply pipeline. 3.如权利要求2所述的低氮预混烟气内循环燃气燃烧器，其特征是：耐火环前端面为台阶形，外环燃气管和内环燃气管设置在耐火环不同的台阶处。3. The low-nitrogen premixed flue gas internal circulation gas burner as claimed in claim 2, wherein the front end face of the refractory ring is stepped, and the outer ring gas pipe and the inner ring gas pipe are arranged at different steps of the refractory ring . 4.如权利要求2所述的低氮预混烟气内循环燃气燃烧器，其特征是：内环燃气管上开有作为内环喷嘴的内环燃气出气口。4. The low-nitrogen premixed flue gas inner-circulation gas burner according to claim 2, wherein the inner-ring gas pipe is provided with an inner-ring gas outlet serving as an inner-ring nozzle. 5.如权利要求1所述的低氮预混烟气内循环燃气燃烧器，其特征是：外环燃气管上开有作为外环喷嘴的外环燃气出气口。5 . The low-nitrogen premixed flue gas internal circulation gas burner according to claim 1 , wherein the outer ring gas pipe is provided with an outer ring gas outlet serving as an outer ring nozzle. 6 . 6.如权利要求1所述的低氮预混烟气内循环燃气燃烧器，其特征是：预混喷嘴轴线与空气通道出口的轴线成35°-65°。6 . The low-nitrogen premixed flue gas internal circulation gas burner according to claim 1 , wherein the axis of the premixing nozzle and the axis of the outlet of the air passage form 35°-65°. 7 .
CN201911276422.0A 2019-12-12 2019-12-12 Low nitrogen premixed flue gas internal circulation gas burner Active CN111023089B (en)

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CN211575107U (en) * 2019-12-12 2020-09-25 无锡顺盟科技有限公司 Low-nitrogen premixed flue gas internal circulation gas burner

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JP2002257345A (en) * 2000-12-28 2002-09-11 Toyota Central Res & Dev Lab Inc Premix combustor for gas turbine and fuel supply control device and method therefor
US6652268B1 (en) * 2003-01-31 2003-11-25 Astec, Inc. Burner assembly
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113701156A (en) * 2021-09-07 2021-11-26 欧保(中国)环境工程股份有限公司 Gas burner with low nitrogen oxide emission

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