CN220186808U - Natural gas ammonia-doped low-nitrogen premix burner - Google Patents
Natural gas ammonia-doped low-nitrogen premix burner Download PDFInfo
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- CN220186808U CN220186808U CN202320951070.XU CN202320951070U CN220186808U CN 220186808 U CN220186808 U CN 220186808U CN 202320951070 U CN202320951070 U CN 202320951070U CN 220186808 U CN220186808 U CN 220186808U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 182
- 239000003345 natural gas Substances 0.000 title claims abstract description 91
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 29
- 238000002485 combustion reaction Methods 0.000 claims abstract description 65
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 47
- 239000003381 stabilizer Substances 0.000 claims description 12
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
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- 241000196324 Embryophyta Species 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
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- 239000000446 fuel Substances 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
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- 239000003208 petroleum Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 102000001554 Hemoglobins Human genes 0.000 description 1
- 108010054147 Hemoglobins Proteins 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a natural gas ammonia-doped low-nitrogen premix burner, which belongs to the technical field of burners and is characterized in that a natural gas channel, an ammonia gas channel, a natural gas nozzle and an ammonia gas nozzle are correspondingly arranged in a burner shell, so that a main flame is generated by natural gas combustion, and an ammonia gas auxiliary combustion is used for generating a stable flame, so that the stability of the natural gas combustion flame is improved. The natural gas ammonia-doped low-nitrogen premix burner has the advantages of simple structure, convenience in use, capability of realizing auxiliary combustion of natural gas, improvement of flame stability of the burner, reduction or avoidance of flame extinction in the use process of the burner, improvement of flame temperature distribution uniformity in the working process of the burner, thorough gas combustion, reduction of NOx emission concentration, energy conservation and environmental protection, and good practical value and application prospect.
Description
Technical Field
The utility model belongs to the technical field of combustors, and particularly relates to a natural gas ammonia-doped low-nitrogen premix combustor.
Background
Compared with primary fossil energy sources such as coal, petroleum and the like, the natural gas can generate cleaner flame, and the burnt flue gas hardly contains air pollutants such as carbon smoke, sulfur dioxide and the like. Under increasingly severe environmental pressures, energy consumption is shifted to a more economical and environment-friendly direction, so that the consumption of natural gas is gradually increased, and the proportion of primary energy is already close to petroleum.
Typically, 34kg of NO is produced per ten thousand cubic meters of natural gas burned x (in NO) 2 Calculated) which results in a large amount of NO per year x Is discharged to the atmosphere. NO (NO) x Mainly comprises NO and NO 2 、N 2 O、N 2 O 3 、N 2 O 4 、N 2 O 5 Etc., these NO x The hazards of (a) mainly include: (1) NO (NO) x Has toxic effect on human body and animal, can invade lung tissue of organism, and can combine with hemoglobin in blood to make blood in anoxic state, and can also induce lung cancer; (2) NO (NO) x The plant growth inhibitor has the advantages that the plant is damaged, photosynthesis of plant leaves can be inhibited, so that the growth and development of the plant are affected, the yield of crops is reduced, and the plant is withered; (3) NO (NO) x The water or the water vapor in the atmosphere can be converted into nitric acid, and finally acid rain is formed along with the rainwater reaching the ground; (4) NO (NO) x The photochemical smog is formed with hydrocarbon, the nitrogen oxides and hydrocarbon compounds can generate chemical reaction under the condition of sunlight irradiation, and the toxicity of the products is much higher than that of the original substances, so that the atmosphere is seriously polluted; (5) NO (NO) x Can participate in the destruction of the ozone layer, so that the global greenhouse effect appears, and is very unfavorable to the physical health and ecological environment of people. In summary, the combustion products NO in natural gas boilers and kilns x It is self-evident that NO is harmful to the environment and the human body x Emission controlThe technology is of great importance.
Meanwhile, the burner is a key device of an industrial boiler and a kiln, and is a necessary premise for ensuring stable ignition and combustion of fuel. The existing burner has the defects that the temperature of the burner head is high due to the structural limitation, so that NO is generated x The content is often as high as 150mg/m 3 The above. Secondly, the existing burner with more metal fiber surfaces has high requirements on the metal net materials, has severe requirements on the cleanliness of fuel, is extremely easy to cause blocking and deflagration phenomena, needs to be provided with a special filter, and has high manufacturing cost, so that the economical requirements of practical application cannot be fully met.
Disclosure of Invention
In view of one or more of the above-mentioned drawbacks or improvements in the prior art, the present utility model provides a natural gas ammonia-doped low-nitrogen premix burner capable of realizing stable flame combustion of natural gas, ensuring flame stability and uniformity of flame temperature distribution during burner operation, and reducing NO x Is a waste concentration of the waste.
In order to achieve the aim, the utility model provides a natural gas ammonia-doped low-nitrogen premix burner which comprises a gas combustion chamber and a burner shell arranged at one side of the gas combustion chamber,
the burner housing comprises a natural gas channel and a plurality of ammonia gas channels arranged around the natural gas channel;
one end of the natural gas channel is provided with a natural gas nozzle extending into the gas combustion chamber, and one end of the ammonia gas channel is provided with an ammonia gas nozzle extending into the gas combustion chamber.
As a further improvement of the utility model, a flame stabilizer is arranged in one end of the ammonia gas channel close to the gas combustion chamber, and the ammonia gas nozzle is connected to the flame stabilizer.
As a further improvement of the utility model, the diameter of the natural gas nozzle is 18 mm-26 mm;
and/or
The diameter of the ammonia gas nozzle is 2.3 mm-2.8 mm.
As a further improvement of the utility model, the natural gas channels in the burner housing are a plurality of natural gas channels arranged at intervals, and a plurality of ammonia gas channels are respectively arranged circumferentially around the outer side of each natural gas channel.
As a further improvement of the utility model, the natural gas channel is arranged at the center of the burner housing and corresponds to the middle part of the gas combustion chamber.
As a further improvement of the utility model, the number of the ammonia gas nozzles arranged in the circumferential direction outside the natural gas channel is 15-25.
As a further improvement of the utility model, the number of the ammonia gas nozzles arranged in the outer circumference of the natural gas channel is 18, 20 or 22.
As a further improvement of the utility model, at least part of the ammonia gas nozzles which are circumferentially arranged at intervals outside the same natural gas channel have the same diameter;
and/or
At least part of the ammonia gas nozzles in the outer circumference of the same natural gas channel are arranged at the same intervals.
As a further improvement of the utility model, the natural gas nozzle outputs natural gas and burns to form main flame with an excess air coefficient of 1.05-1.35;
and the ammonia gas nozzle outputs ammonia gas and burns to form stable flame with an excess air coefficient of 0.75-0.95.
The above-mentioned improved technical features can be combined with each other as long as they do not collide with each other.
In general, the above technical solutions conceived by the present utility model have the beneficial effects compared with the prior art including:
(1) The natural gas ammonia-doped low-nitrogen premix burner of the utility model generates main flame by natural gas combustion through the corresponding arrangement of the natural gas channel, the ammonia gas channel, the natural gas nozzle and the ammonia gas nozzle in the burner shell, generates stable flame by ammonia gas auxiliary co-doping combustion, further improves the stability of natural gas combustion flame, ensures thorough combustion of gas, improves the flame stability and the temperature distribution uniformity during natural gas combustion,reduction of NO x Is energy-saving and environment-friendly.
(2) According to the natural gas ammonia-doped low-nitrogen premix burner, the accuracy and the reliability of natural gas stable flame combustion are further improved by preferably setting the ammonia gas nozzles, the diameter parameters of the natural gas nozzles and the setting quantity of the ammonia gas nozzles, and the low-nitrogen combustion performance index of the burner in operation is improved.
(3) The natural gas ammonia-doped low-nitrogen premix burner has the advantages of simple structure, convenience in use, capability of realizing auxiliary combustion of natural gas, improvement of flame stability of the burner, reduction or avoidance of flame extinction in the use process of the burner, improvement of flame temperature distribution uniformity in the working process of the burner, thorough gas combustion, reduction of NOx emission concentration, energy conservation and environmental protection, and good practical value and application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a natural gas ammonia low nitrogen premix burner in accordance with an embodiment of the utility model;
FIG. 2 is a graph showing the temperature profile of a gas combustion chamber during stable combustion of a natural gas-doped low nitrogen premix burner in accordance with an embodiment of the present utility model;
FIG. 3 is a schematic illustration of NO in a gas combustion chamber during stable combustion in a natural gas-doped low nitrogen premix burner in accordance with an embodiment of the utility model x A concentration profile;
like reference numerals denote like technical features throughout the drawings, in particular:
1. a gas combustion chamber; 2. a natural gas nozzle; 3. an ammonia gas nozzle; 4. a flame stabilizer; 5. an ammonia gas channel; 6. a burner housing; 7. natural gas passage.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Examples:
referring to fig. 1, the natural gas ammonia-doped low-nitrogen premix burner in the preferred embodiment of the present utility model comprises a gas combustion chamber 1 and a burner housing 6 connected to one side of the gas combustion chamber 1, wherein a plurality of gas channels are arranged in the burner housing 6, and a gas nozzle is arranged at the end of each gas channel connected to the gas combustion chamber 1, so as to realize the delivery of the gas in the burner and the reliable supply during the combustion.
Specifically, at least one main combustion gas channel, namely a natural gas channel 7, is provided within the burner housing 6 in the preferred embodiment. For example, in the preferred embodiment shown in fig. 1, there are 1 main combustion gas channels, which are more particularly preferably arranged in the central position of the burner housing 6 and correspond to the middle part of the gas combustion chamber 1 for carrying out the transport of the main combustion gas, i.e. the transport of natural gas, in the burner.
Meanwhile, a natural gas nozzle 2 is arranged at the end part of the natural gas channel 7 communicated with the gas combustion chamber 1, and extends into the gas combustion chamber 1 for stably and continuously conveying the gas (namely, the natural gas) in the natural gas channel 7 into the gas combustion chamber 1 for combustion.
In more detail, in actual setting, the diameter of the natural gas nozzle 2 is preferably 18mm to 26mm, as shown by D1 in fig. 1.
In order to ensure stable combustion of the main combustion gas, a plurality of flame holders 4 are circumferentially arranged at intervals on the outer circumference of each main combustion gas channel, and a stable gas channel is respectively arranged corresponding to each flame holder 4 for introducing combustion stable gas into the gas combustion chamber 1. In a preferred embodiment, the combustion stabilizing gas for premixed combustion with natural gas is preferably ammonia.
Because the ammonia gas has high hydrogen content, the ammonia gas is a good hydrogen carrier, can be liquefied only under the condition of 0.7-0.8 MPa at normal temperature, is convenient to store and transport, has the volume energy density higher than that of hydrogen energy and is equivalent to that of gasoline and diesel oil, and the products after the ammonia gas is completely combusted are nitrogen and water, and can assist in realizing low carbon and no carbon while improving the combustion quality of natural gas by doping the ammonia gas.
More specifically, in the preferred embodiment, the stabilizer gas passages are provided in the burner housing 6, which deliver combustion stabilizer gas of ammonia gas, and are further provided circumferentially at intervals on the outer periphery of the natural gas passage 7. Meanwhile, the flame stabilizer 4 is provided at the end of the stabilizer gas passage communicating with the gas combustion chamber 1, and an ammonia gas nozzle 3 extending into the gas combustion chamber 1 is provided at the end of the flame stabilizer 4 to thereby input combustion stabilizer gas in the stabilizer gas passage into the gas combustion chamber 1.
In actual setting, the number of ammonia gas nozzles 3 corresponding to a single natural gas nozzle 2 is preferably 15-25, for example, 18, 20 or 22 actually selected in the preferred embodiment.
Further, in the preferred embodiment, the diameters of the ammonia gas nozzles 3 are preferably the same, and the diameters of the ammonia gas nozzles 3 are preferably 2.3mm to 2.8mm, which extend into the gas combustion chamber 1, and are further arranged at equal intervals in the circumferential direction of the natural gas nozzle 2.
Of course, in actual setting, the size of each ammonia gas nozzle 3 may be different or partially different, and the interval between each two adjacent ammonia gas nozzles 3 may be different, depending on the setting conditions and the use requirements.
In addition, according to the different design specifications of the actual burner, the number of the natural gas channels 7 provided for the same gas combustion chamber 1 is plural, the natural gas channels 7 are provided at intervals in the burner housing 6, and the ammonia gas channels 5 are provided corresponding to the natural gas channels 7, respectively.
In actual use, the natural gas nozzle 2 is used for outputting natural gas and burning the natural gas to form a main flame; the ammonia gas nozzle 3 is used for outputting ammonia gas and burning to form stable flame. Meanwhile, the excess air coefficient of the main flame is preferably 1.05-1.35; the excess air ratio of the stable flame is preferably 0.75-0.95.
The technical effects of the foregoing embodiments of the present utility model are described in addition to the actual combustion conditions in one embodiment as follows.
In this example, the diameter of the natural gas nozzle 2 was 20mm, the diameter of the ammonia gas nozzle 3 was 2.5mm, and the number of ammonia gas nozzles was 18, the excess air ratio of the main flame was 1.3, and the excess air ratio of the stable flame was 0.9.
Through the actual combustion test, the temperature distribution condition and NO of the gas combustion chamber 1 during normal operation of the burner x The concentration profiles are shown in fig. 2 and 3, respectively. It can be found from the figure that the gas after the combustion of the main flame and the stable flame expands along the radial direction before the flame, the main flame has slender shape and good stability under the auxiliary combustion of the stable flame, the temperature near the main flame is highest, the temperature distribution is quite uniform, and no local high temperature point exists. At the same time, NO generated after combustion of gasxThe concentration distribution is also relatively uniform, even if the NO at the highest pointxThe concentration is also lower than 58mg/m 3 The performance index of low-nitrogen combustion is far better than that of a common low-nitrogen combustor on the market.
The natural gas ammonia-doped low-nitrogen premix burner has the advantages of simple structure and convenient use, can realize auxiliary combustion of natural gas, improve the stability of flame of the burner, reduce or avoid extinguishing of flame in the using process of the burner, improve the uniformity of flame temperature distribution when the burner works, ensure thorough combustion of fuel gas and reduce NO x Is energy-saving and environment-friendly, and has good practical value and application prospect.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (9)
1. A natural gas ammonia-doped low-nitrogen premix burner comprises a gas combustion chamber and a burner shell arranged at one side of the gas combustion chamber, and is characterized in that,
the burner housing comprises a natural gas channel and a plurality of ammonia gas channels arranged around the natural gas channel;
one end of the natural gas channel is provided with a natural gas nozzle extending into the gas combustion chamber, and one end of the ammonia gas channel is provided with an ammonia gas nozzle extending into the gas combustion chamber.
2. The natural gas ammonia-doped low nitrogen premix burner of claim 1 wherein a flame stabilizer is disposed in an end of said ammonia gas channel adjacent said gas combustion chamber and said ammonia gas nozzle is connected to said flame stabilizer.
3. The natural gas ammonia-doped low nitrogen premix burner of claim 2 wherein the diameter of the natural gas nozzle is 18mm to 26mm;
and/or
The diameter of the ammonia gas nozzle is 2.3 mm-2.8 mm.
4. The natural gas ammonia-doped low nitrogen premix burner of claim 1, wherein a plurality of natural gas channels are arranged in the burner housing at intervals, and a plurality of ammonia channels are respectively arranged around the outer circumference of each natural gas channel.
5. A natural gas ammonia-doped low nitrogen premix burner according to any of claims 1 to 3, wherein said natural gas channel is arranged in a central position of said burner housing and corresponds to a middle portion of said gas combustion chamber.
6. The natural gas ammonia-doped low nitrogen premix burner according to any one of claims 1 to 4, wherein the number of ammonia nozzles arranged in the circumferential direction outside the natural gas channel is 15 to 25.
7. A natural gas ammonia-doped low nitrogen premix burner according to claim 6,
the ammonia gas nozzles are arranged on the outer circumference of the natural gas channel, and the number of the ammonia gas nozzles is 18, 20 or 22.
8. The natural gas ammonia-doped low nitrogen premix burner of claim 6 wherein at least some of the plurality of ammonia gas nozzles circumferentially spaced apart from the outside of the same natural gas channel are the same diameter;
and/or
At least part of the ammonia gas nozzles in the outer circumference of the same natural gas channel are arranged at the same intervals.
9. The natural gas ammonia-doped low nitrogen premix burner according to any one of claims 1 to 4, 7, 8, wherein said natural gas nozzle outputs natural gas and burns to form a main flame with an excess air ratio of 1.05 to 1.35;
the ammonia gas nozzle outputs ammonia gas and burns to form stable flame with excessive air coefficient of 0.75-0.95.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320951070.XU CN220186808U (en) | 2023-04-24 | 2023-04-24 | Natural gas ammonia-doped low-nitrogen premix burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320951070.XU CN220186808U (en) | 2023-04-24 | 2023-04-24 | Natural gas ammonia-doped low-nitrogen premix burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220186808U true CN220186808U (en) | 2023-12-15 |
Family
ID=89108543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320951070.XU Active CN220186808U (en) | 2023-04-24 | 2023-04-24 | Natural gas ammonia-doped low-nitrogen premix burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220186808U (en) |
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2023
- 2023-04-24 CN CN202320951070.XU patent/CN220186808U/en active Active
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