CN115289465A - Blast furnace gas burner with ultralow nitrogen emission - Google Patents

Blast furnace gas burner with ultralow nitrogen emission Download PDF

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Publication number
CN115289465A
CN115289465A CN202210871996.8A CN202210871996A CN115289465A CN 115289465 A CN115289465 A CN 115289465A CN 202210871996 A CN202210871996 A CN 202210871996A CN 115289465 A CN115289465 A CN 115289465A
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CN
China
Prior art keywords
blast furnace
furnace gas
air
outer shell
pipe
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Pending
Application number
CN202210871996.8A
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Chinese (zh)
Inventor
林永兵
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Huangshi Xinrui Environmental Protection Technology Co ltd
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Huangshi Xinrui Environmental Protection Technology Co ltd
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Priority to CN202210871996.8A priority Critical patent/CN115289465A/en
Publication of CN115289465A publication Critical patent/CN115289465A/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
    • F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
    • 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
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • 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
    • F23D14/70—Baffles or like flow-disturbing devices
    • 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
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/725—Protection against flame failure by using flame detection devices

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Abstract

The invention discloses a blast furnace gas burner with ultralow nitrogen emission, which comprises a blast furnace gas pipe and an outer shell which are coaxially arranged from inside to outside, wherein the inlet end of the blast furnace gas pipe is arranged outside the outer shell and is connected with an external blast furnace gas source, the outlet end of the blast furnace gas pipe is arranged inside the outer shell and is distributed with a gas swirl sheet, a central air pipe is arranged through the center of the blast furnace gas pipe, an ignition gun is arranged in the central air pipe, the ignition end of the ignition gun and the air outlet of the central air pipe are both positioned at the outlet end of the blast furnace gas pipe, one side of the outer shell is connected with a combustion-supporting air pipeline, the combustion-supporting air pipeline is communicated with a cavity between the outer shell and the blast furnace gas pipe, the combustion-supporting air pipeline is communicated with the central air pipe, an air distributor is arranged in the cavity of the outer shell positioned at the outlet end of the blast furnace gas pipe, and a high-speed injector is arranged at the outlet end of the outer shell.

Description

Blast furnace gas burner with ultralow nitrogen emission
Technical Field
The invention relates to the technical field of industrial burners, in particular to a blast furnace gas burner with ultralow nitrogen emission, which is matched with kilns such as a hot blast furnace or a flue gas furnace and the like to produce high-temperature flue gas or hot air and is mainly used for various drying kilns in the chemical industry, metallurgy industry and building material industry and a flue gas emission pretreatment system in various industries to burn blast furnace gas so as to provide a heat source.
Background
Blast furnace gas is a byproduct in the blast furnace ironmaking process, is formed by transforming coke after gasification in a blast furnace, and mainly comprises nitrogen, carbon monoxide, carbon dioxide, hydrogen and a small amount of other components, wherein only the carbon monoxide and the small amount of hydrogen are combustible substances, the weight of the carbon monoxide and the small amount of hydrogen are only 20-30 percent of the weight of the gas, and the low calorific value is only 700-850 kcal/Nm 3 . When blast furnace gas is introduced into a common burner, the problems of flameout or incomplete combustion of the burner and the like are easy to occur due to less combustible components and low heat value of the blast furnace gas, so that hidden dangers are brought to the safe operation of furnace body equipment, and the emission of nitrogen oxides of the common burner is high, so that the standard of low-nitrogen emission is difficult to achieve.
At present, the blast furnace gas burner adopts air rotational flow and blast furnace gas multi-head internal mixing or vortex scattering to promote the premixing of gas and air and reduce the generation of nitrogen oxide; meanwhile, the combustion is stabilized by preheating air or coal gas or arranging a heat accumulator in a hearth. However, with the emission standards for nitrogen oxides becoming more stringent, such burners have not been able to achieve nitrogen oxides of less than 30mg/m 3 Ultra-low nitrogen emission standards; in addition, especially when the heating load required by the drying kiln reaches 1200 ten thousand calories, the size of the burner becomes very large, and when the heating load required by a plurality of drying kilns is higher, the burner needs to be matched with two or more burners for use, so that the arrangement of the burners for the drying kilns and the production management are inconvenient, and the cost of the drying kilns, a plurality of equipment fault points and the manual management cost are increased.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a blast furnace gas burner with ultralow nitrogen emission, so that high-temperature flue gas or hot air generated by the burner for burning blast furnace gas can achieve ultralow nitrogen oxide emission, and nitrogen oxide generated in the burning process is not more than 30mg/m 3 Even lower; meanwhile, stable combustion can be realized without preheating measures for the gas and the air, and the gas is prevented from being extinguished due to faults, so that the gas is completely combusted.
In order to achieve the technical purpose, the technical scheme of the invention provides a blast furnace gas burner with ultralow nitrogen emission, which comprises a blast furnace gas pipe and an outer shell which are coaxially arranged from inside to outside, wherein the inlet end of the blast furnace gas pipe is arranged outside the outer shell and is connected with an external blast furnace gas source, the outlet end of the blast furnace gas pipe is arranged inside the outer shell and is provided with a gas swirl plate, blast furnace gas is sprayed in a strong swirl mode through the gas swirl plate, a central air pipe penetrates through the center of the blast furnace gas pipe and is provided with an ignition gun, the ignition end of the ignition gun and the air outlet of the central air pipe are both positioned at the outlet end of a blast furnace gas tank, one side of the outer shell is connected with a combustion-supporting air pipeline, the combustion-supporting air pipeline is communicated with a cavity between the outer shell and the blast furnace gas pipe, the combustion-supporting air pipeline is communicated with the central air pipe, an air distributor is arranged in the cavity of the outer shell positioned at the outlet end of the blast furnace gas pipe, and a high-speed injector is arranged at the outlet end of the outer shell.
Furthermore, a valve for controlling air inflow is arranged at the air inlet of the central air pipe, and the air quantity of combustion air in the central air pipe is adjusted through the valve so as to adjust the combustion atmosphere of flame and enable the center of the flame to be in weak reducing atmosphere.
Further, a flame stabilizing disc is arranged at the air outlet of the central air pipe.
Furthermore, the flame stabilizing disc is a porous flame stabilizing disc, and airflow jetted by the porous flame stabilizing disc is distributed along the axial direction or the radial direction of the combustor.
Further, the high-speed ejector has a square/polygonal or circular ejection port.
Further, a flame detector is further arranged on the outer shell.
Further, the flame detector obliquely penetrates through the outer shell, and one end, located in the cavity of the outer shell, of the flame detector is connected to the air distributor.
Furthermore, an artificial fire observation hole is also arranged on the burner.
Further, the air distributor is obliquely arranged in the cavity of the outer shell, one end of the air distributor is close to the high-speed injector, and the other end of the air distributor is close to the gas swirl plate.
Furthermore, the combustor is of a multilayer cylindrical structure, a plurality of channels are formed among multiple layers of the combustor, and combustion-supporting air flows through all the channels except the blast furnace gas flowing in the blast furnace gas pipe.
Compared with the prior art, the invention has the beneficial effects that:
1. the blast furnace gas burner provided by the invention can adjust the flame combustion atmosphere by grading the combustion-supporting air (namely respectively sending the combustion-supporting air to the burner through the combustion-supporting air pipeline and the central air pipe) and adjusting the change of the air quantity in the central air pipe, so that the flame center is in weak reducing atmosphere, the generation of nitrogen oxide is favorably inhibited, and the nitrogen oxide generated in the combustion process is not more than 30mg/m 3 Even lower.
2. The blast furnace gas burner provided by the invention can control the generation of nitrogen oxide, ensure the stable combustion of blast furnace gas, reduce flameout faults and ensure safer gas combustion.
3. The blast furnace gas burner provided by the invention is provided with the gas swirl sheets and the air distributor, so that the gas outlet realizes the premixing in a mode of combining strong swirl distribution and air impact.
Drawings
FIG. 1 is a schematic view showing the overall structure of an ultra-low nitrogen emission blast furnace gas burner of the present invention.
Shown in the figure:
1-blast furnace gas pipe, 2-outer shell, 3-gas swirl plate, 4-central air pipe, 5-ignition gun, 6-combustion air pipeline, 7-air distributor, 8-high-speed injector, 9-valve, 10-flame stabilizing disc and 11-flame detector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, the present invention provides a blast furnace gas burner with ultra-low nitrogen emission, which includes a blast furnace gas tube 1 and an outer shell 2 coaxially and sequentially arranged from inside to outside, wherein an inlet end of the blast furnace gas tube 1 is arranged outside the outer shell 2 and connected with an external blast furnace gas source, an outlet end of the blast furnace gas tube 1 is arranged inside the outer shell 2 and distributed with a gas swirl plate 3, blast furnace gas is injected through the gas swirl plate in a strong swirl manner, a central air tube 4 is arranged through the center of the blast furnace gas tube 1, an ignition gun 5 is arranged in the central air tube 4, an ignition end of the ignition gun 5 and an air outlet of the central air tube 4 are both located at the outlet end of the blast furnace gas tube 1, one side of the outer shell 2 is connected with a combustion air duct 6, the combustion air duct 6 is communicated with a cavity between the outer shell 2 and the blast furnace gas tube 1, the combustion air duct 6 is communicated with the central air tube 4, an air distributor 7 is arranged in the cavity of the outer shell 2 located at the outlet end of the blast furnace gas tube 1, and a high-speed injector 8 is arranged at the outer shell 2.
In the technical scheme, blast furnace gas flows through the gas swirl plate 3 through the blast furnace gas pipe 1 to form strong swirl, the rotating gas is mixed by a plurality of vertical air flows jetted from the air distributor 7 when flowing out, and the swirl gas is impacted by each small air flow, so that combustion-supporting air and the blast furnace gas can be quickly and uniformly premixed.
Meanwhile, high-speed axial direct-current wind is jetted out of the high-speed jet 8, the wind speed is as high as about 200m/s, and a large speed difference is formed between the high-speed direct-current wind and airflow around the combustor, so that a large amount of high-temperature smoke at the front part of the combustor flows back, and a stable high-temperature backflow area is formed at the front end of the combustor; the backflow high-temperature flue gas ignites the premixed air-fuel gas, thereby achieving the purpose of continuous and stable combustion.
Combustion-supporting air enters the combustor through two channels of the combustion-supporting air pipeline 6 and the central air pipe 4, which is equivalent to classification of the combustion-supporting air, so that ultra-low nitrogen combustion is realized through internal circulation of flue gas, air classification and rotational flow impact premixing technology, and generation of a large amount of thermal nitrogen is avoided.
Specifically, a valve 9 for controlling air inflow is arranged at an air inlet of the central air pipe 4, and the air quantity of combustion air in the central air pipe 4 is adjusted through the valve 9 so as to adjust the combustion atmosphere of flame, so that the center of the flame is in a weak reducing atmosphere, and the generation of nitrogen oxide is favorably inhibited.
Specifically, a flame stabilizing disc 10 is arranged at an air outlet of the central air pipe 4, and the air quantity sprayed out from the flame stabilizing disc 10 is changed through the valve 9, so that the distance between the root of the flame and the end face of the burner is adjusted, the flame is stabilized, and the burner is protected from being damaged due to overheating.
Specifically, the flame stabilizing disc 10 is a multi-hole flame stabilizing disc, and the airflow jetted by the multi-hole flame stabilizing disc is distributed along the axial direction or the radial direction of the burner.
Specifically, the high-speed injector 8 has a square/polygonal or circular injection port, and can be adjusted or replaced according to a specific working condition or a furnace type by matching a suitable type and model.
Specifically, a flame detector 11 is further arranged on the outer shell 2, the flame detector 11 obliquely penetrates through the outer shell 2, and one end of the flame detector 11, which is located in the cavity of the outer shell 2, is connected to the air distributor 7.
Preferably, the combustor is further provided with an artificial fire observation hole.
In addition, the air distributor 7 is obliquely arranged in the cavity of the outer shell 2, one end of the air distributor 7 is close to the high-speed injector 8, and the other end of the air distributor is close to the gas swirl plate 3.
It should be noted that the burner of the present invention is a multi-layer cylindrical structure, a plurality of channels are formed between the multiple layers of the burner, the plurality of channels include a blast furnace gas channel through which the blast furnace gas pipe 1 flows, a combustion air channel through which the central air pipe 4 flows, and a combustion air channel through which the cavity inside the outer shell 2 flows, and the channels flow combustion air uniformly except for the blast furnace gas flowing through the blast furnace gas pipe 1, so that the combustion air is classified, which is beneficial to controlling the flame combustion atmosphere, and the flame center is in a weak reducing atmosphere, thereby inhibiting the generation of nitrogen oxide.
The working principle of the blast furnace gas burner with ultralow nitrogen emission provided by the invention is as follows:
combustion-supporting air enters the outer shell 2 of the burner, and a part of air enters the central air pipe 4 through the valve 9 and is sprayed out through the flame stabilizing disc 10; a part of air is sprayed out by the air distributor 7 and is collided and mixed with the strong swirling flow coal gas; a part of the air enters the high-speed ejector 8, and the direct-current high-speed ejection forms a vortex return area.
Blast furnace gas flows through the gas swirl plate 3 through the blast furnace gas pipe 1 and forms a mixture of gas strong rotation and vertical impact with air with a plurality of air flows sprayed from the air distributor 7 at the outlet of the burner, and the uniformly mixed air-gas is continuously ignited by backflow high-temperature flue gas formed by direct current spraying of the high-speed sprayer 8 to realize stable combustion.
The effect of the present invention is further confirmed by a specific example below:
example (c): a gas hot-blast furnace (XRQL-14 type) in Fujian Zhangzhou 4.6m slag grinding system supplies heat for 1.4 x 10 7 kcal/h, blast furnace gas is used for combustion, coke oven gas is adopted for ignition, and an ultralow nitrogen blast furnace gas burner (XRRQ-G-14 type) is matched.
Rated heating capacity of the burner 1.4 x 10 7 kcal/h (16.26 MW), low calorific value of blast furnace gas 750kcal/Nm 3 . Actual operating data: 19330Nm blast furnace gas flow 3 H, heat supply reaches 1.45 to 10 7 kcal/h, amount of air entering burner 14560m 3 H, heatThe temperature of a blast furnace hearth is 950 ℃, the pressure of the hearth is-100 Pa, and the output per hour of a vertical grinding table is 105t/h. Actually measuring the nitrogen oxide emission concentration at the outlet of the hot blast stove to be 24mg/m 3 Carbon monoxide is not detected, and the emission standard (30 mg/m) of the highest requirement of nitrogen oxide in China at present is reached 3 ) The slag grinding system has stable operation and capacity and environmental protection reaching standards since the production is put into operation.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A blast furnace gas burner with ultralow nitrogen emission is characterized by comprising a blast furnace gas pipe and an outer shell which are coaxially arranged from inside to outside, wherein the inlet end of the blast furnace gas pipe is arranged outside the outer shell and is connected with an external blast furnace gas source; a central air pipe is arranged through the center of the blast furnace gas pipe, an ignition gun is arranged in the central air pipe, and an ignition end of the ignition gun and an air outlet of the central air pipe are both positioned at the outlet end of the blast furnace gas pipe; one side of the outer shell is connected with a combustion-supporting air pipeline, the combustion-supporting air pipeline is communicated with a cavity between the outer shell and the blast furnace gas pipe, and the combustion-supporting air pipeline is communicated with the central air pipe; and an air distributor is arranged in the cavity of the outer shell at the outlet end of the blast furnace gas pipe, and a high-speed ejector is arranged at the outlet end of the outer shell.
2. The blast furnace gas burner with ultralow nitrogen emission according to claim 1, wherein a valve for controlling the air inflow is arranged at the air inlet of the central air pipe, and the air quantity of combustion air in the central air pipe is adjusted through the valve to adjust the combustion atmosphere of flame so that the center of the flame is in a weak reducing atmosphere.
3. The blast furnace gas burner with ultralow nitrogen emission according to claim 2, wherein a flame stabilizing disc is arranged at the air outlet of the central air pipe.
4. The ultra-low nitrogen emission blast furnace gas burner of claim 3, wherein the flame stabilizing disk is a multi-hole flame stabilizing disk, and the gas flow ejected through the multi-hole flame stabilizing disk is distributed along the axial direction or the radial direction of the burner.
5. The ultra-low nitrogen emissions blast furnace gas burner of claim 1, wherein the high velocity jet has square/polygonal or circular jet ports.
6. The ultra-low nitrogen emission blast furnace gas burner of claim 1, wherein a flame detector is further disposed on the outer shell.
7. The ultra-low nitrogen emission blast furnace gas burner of claim 6, wherein the flame detector is inclined through the outer shell and is connected to the air distributor at an end of the flame detector located in the cavity of the outer shell.
8. The ultra-low nitrogen emission blast furnace gas burner of claim 7, wherein said burner is further provided with artificial fire observation holes.
9. The ultra-low nitrogen emissions blast furnace gas burner of claim 1, wherein the air distributor is disposed in the cavity of the outer shell in an inclined manner, and one end of the air distributor is close to the high-speed injector and the other end of the air distributor is close to the gas swirl plate.
10. The blast furnace gas burner with ultralow nitrogen emission according to claim 1, wherein the burner is a multi-layer cylindrical structure, a plurality of channels are formed among the multiple layers of the burner, and combustion air flows through all the channels except the blast furnace gas flowing through the blast furnace gas pipe.
CN202210871996.8A 2022-07-19 2022-07-19 Blast furnace gas burner with ultralow nitrogen emission Pending CN115289465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210871996.8A CN115289465A (en) 2022-07-19 2022-07-19 Blast furnace gas burner with ultralow nitrogen emission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210871996.8A CN115289465A (en) 2022-07-19 2022-07-19 Blast furnace gas burner with ultralow nitrogen emission

Publications (1)

Publication Number Publication Date
CN115289465A true CN115289465A (en) 2022-11-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210871996.8A Pending CN115289465A (en) 2022-07-19 2022-07-19 Blast furnace gas burner with ultralow nitrogen emission

Country Status (1)

Country Link
CN (1) CN115289465A (en)

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