CN110657433A - Gas cladding type low-nitrogen non-oxidation burner - Google Patents
Gas cladding type low-nitrogen non-oxidation burner Download PDFInfo
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- CN110657433A CN110657433A CN201910860009.2A CN201910860009A CN110657433A CN 110657433 A CN110657433 A CN 110657433A CN 201910860009 A CN201910860009 A CN 201910860009A CN 110657433 A CN110657433 A CN 110657433A
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- 239000007789 gas Substances 0.000 title claims abstract description 81
- 230000003647 oxidation Effects 0.000 title claims abstract description 49
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 49
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 43
- 238000005253 cladding Methods 0.000 title claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 65
- 239000007921 spray Substances 0.000 claims abstract description 49
- 238000005507 spraying Methods 0.000 claims abstract description 46
- 238000012806 monitoring device Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000011819 refractory material Substances 0.000 claims abstract description 7
- 239000002737 fuel gas Substances 0.000 claims description 18
- 230000001590 oxidative effect Effects 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 230000002401 inhibitory effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 29
- 238000010438 heat treatment Methods 0.000 description 21
- 239000000446 fuel Substances 0.000 description 15
- 239000007769 metal material Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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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
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
- F23D14/24—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion
-
- 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
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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 utility model provides a low nitrogen non-oxidation nozzle of gas cladding type, includes nozzle shell and sets up gas device, combustion air jetter, ignition and the flame monitoring device in nozzle shell, its characterized in that: the combustion-supporting air spraying device consists of a combustion-supporting air channel, a combustion-supporting air spraying pipe and a combustion-supporting air spraying nozzle, and the combustion-supporting air spraying pipe is arranged at the center of the burner shell; the method is characterized in that: the gas spray pipes are dispersedly arranged in an outer layer refractory material layer taking the combustion-supporting air spray pipe as the center, the front parts of the gas spray pipes are inclined to the center of the burner by a certain curvature and coated outside a combustion-supporting air spraying annular seam or a combustion-supporting air swirler arranged at the front end of the combustion-supporting air spray pipe, so that a coated low-nitrogen non-oxidation burner structure is formed, and a coated low-nitrogen non-oxidation combustion state with low middle flame temperature and high outer ring temperature is formed when the burner works.
Description
Technical Field
The invention relates to a low-nitrogen non-oxidation burner, in particular to a gas-coated low-nitrogen non-oxidation burner and a gas-type heating furnace comprising the burner; belongs to the technical field of metal hot processing.
Background
The metal material needs to be heated to a set temperature during hot working or heat treatment. A common heating method is to heat the material in a heating furnace by using a gas burner. The oxidation speed of the surface of the metal material is accelerated along with the rise of the heating temperature under the atmosphere, so that the oxidation burning loss of the metal material is increased. For example, the oxidation burning loss range of the billet after the billet is heated by a heating furnace is 0.6-2.3 percent and can reach 4 percent at most (the heating temperature exceeds 1300 ℃). The large amount of surface oxide skin is generated, so that the metal yield is greatly reduced, and the production cost is increased; on the other hand, the surface state of the metal material is deteriorated, a large number of surface defects are formed, and the quality of the final product is directly influenced. In order to reduce the oxidation burning loss, many techniques have been developed, such as strictly controlling the air-fuel ratio of the burner so as to keep the oxygen content in the furnace atmosphere at a relatively low level, and also techniques for measuring the oxygen content in the combustion atmosphere in real time. These techniques work well to control the oxidation burning loss of metal materials, but still do not significantly reduce the oxidation burning loss. Some high-end products are also heated under a protective atmosphere to prevent oxidation and burning. However, this method is not suitable for the heating process in the initial working of most metal materials. Many heat treatment furnaces use protective atmosphere conditions for heating, which is also only suitable for heat treatment of the final product. In addition, the heating is carried out under the protective atmosphere, the heating efficiency is low, the energy consumption is high, the one-time investment of heating equipment is large, and the processing cost is greatly improved.
At present, fuel of a diffusion type gas burner is supplied from the center of the burner, combustion air is outside the fuel, and the fuel and the combustion air are combusted while being diffused. When the combustion air, which has not undergone a combustion reaction, encounters the hot heated metal material (for example, steel billet) during the diffusion process, the metal material is oxidized to form oxide scale. Generally, in order to reduce the scale formation amount, a method of reducing the air-fuel ratio is adopted, which is a measure taken from a macroscopic point of view, and it is difficult to greatly reduce the oxidation burning amount in terms of the combustion process steps.
In addition, in the heating process of the gas burner, the content of NOx in the flue gas is increased along with the increase of the flame temperature, and the influence on the environment cannot be ignored. With the continuous upgrading of environmental protection standards, the requirement on the content of NOx in combustion products is more and more strict. This also places a higher demand on the combustion equipment (burners) of industrial furnaces, i.e., burners that are required to perform low NOx combustion.
Therefore, the development of new low NOx, low oxidation burn-out burners is a continuing goal in the field of industrial furnaces for thermal processing. Chinese patent document CN 108884992 a discloses a "low nitrogen oxide burner" which relates to a heating medium boiler, comprising a burner, wherein a fuel nozzle is formed at the center of the burner, a plurality of small lean/rich flames (fuel lean/fuel rich flames) are formed at the end face of the burner through a plurality of fuel nozzles which are completely separated, so as to realize reburning, and exhaust gas generated from the flames is recycled, thereby reducing nitrogen oxides (NOx) to the utmost extent. The basic combustion system can be realized by a simple structure without peripheral devices, and nitrogen oxides (NOx) can be remarkably reduced by dividing flames into small-sized ones, dispersing heat, lowering flame temperature, forming each small-sized flame into flames with an optimized air-fuel ratio, and guiding a rapid combustion reaction. Although the technical scheme can reduce the generation amount of (NOx), the divided small burners are independently configured with air-fuel ratios through self mechanical structures to carry out independent combustion, and the long flame requirement of a heating furnace in the steel industry is difficult to realize. In addition, when the thermal load of the burner is changed, the air-fuel ratio change of each small burner is difficult to effectively control. In addition, the flue gas circulation of the burner needs to be additionally provided with a pipeline and a fan, and the system is complex. Is difficult to be widely popularized and used in the corresponding technical field.
Disclosure of Invention
The invention aims to develop a novel combustion device, namely a low-nitrogen non-oxidation burner, which can greatly reduce oxidation burning loss and the generation amount of NOx. The condition of NOx generation in the combustion process is fundamentally solved, the oxidation burning loss of metal materials is prevented, the metal yield is improved, and the production cost is reduced.
This kind of low nitrogen of gas cladding type does not have oxidation nozzle, including nozzle shell and set up gas device, combustion air jetter, ignition and the flame monitoring device in nozzle shell, its characterized in that: the combustion-supporting air spraying device consists of a combustion-supporting air channel, a combustion-supporting air spraying pipe and a combustion-supporting air spraying nozzle, and the combustion-supporting air spraying pipe is arranged at the center of the burner shell; the method is characterized in that: the gas spray pipes are dispersedly arranged in an outer layer refractory material layer taking the combustion-supporting air spray pipe as the center, the front parts of the gas spray pipes are inclined towards the center of the burner with a certain curvature and are coated on the outer side of a combustion-supporting air spraying annular seam or a combustion-supporting air swirler arranged at the front end of the combustion-supporting air spray pipe, so that a coated low-nitrogen non-oxidation burner structure is formed, and a coated low-nitrogen non-oxidation combustion state with low middle flame temperature and high outer ring temperature is formed when the burner works.
Preferably, the cone angle of the bent part at the front end of the gas nozzle bent towards the center is 6-15 degrees, preferably, the gas channel is provided with a gas distribution ring, and a throttling orifice plate is arranged at the interface of the gas channel and the gas nozzle.
Preferably, the combustion air jetting device consists of a combustion air jet pipe, a combustion air channel and a combustion air jetting circular seam or a combustion air swirler arranged at the front end of the combustion air jet pipe; the combustion-supporting air spray pipe is arranged at the center of the burner body, a flame detection device penetrating through the cavity of the inner cavity is arranged in the inner cavity of the combustion-supporting air spray pipe, a peephole communicated with the inner cavity is arranged on the pipe body at the rear part of the combustion-supporting air spray pipe, and the flame detection device and the peephole form a flame monitoring device of the burner.
Preferably, the ignition device consists of an ignition electrode and an ignition electrode connector, the ignition electrode connector is positioned on the rear burner shell of the burner body, and the ignition electrode at the front part of the ignition electrode connector is positioned at the outlet of the gas nozzle between the combustion air nozzle and the gas nozzle.
A gas cladding type low-nitrogen non-oxidation burner comprises the following combustion methods: the fuel gas is sprayed out from the fuel gas spray pipe, the combustion-supporting gas is sprayed out from the combustion-supporting gas spray pipe, and the combustion-supporting gas is ignited by the ignition electrode and then subjected to diffusive combustion, at the moment, the outer side of the flame is a fuel gas layer, the center of the flame is combustion-supporting air, the whole combustion process is realized in a state that the fuel gas coats the combustion-supporting air, and in the combustion process, the outer side of the flame is similar to a reducing atmosphere, so that the oxidability of the surface of the heated metal; the center of the flame is similar to the oxidizing atmosphere, so that the center of the flame is in a low-temperature state; thereby inhibiting the generation of NOX from the source and achieving the purpose of reducing the content of NOX in the flue gas.
Compared with the burner used for the current metal heat treatment, the gas cladding type low-nitrogen non-oxidation burner provided by the technical scheme has the following characteristics: by adopting the cladding type combustion structure, a cladding type low-nitrogen non-oxidation combustion state with a relative low-temperature flame zone and a high outer ring temperature is formed in the middle of the burner during combustion, so that the generation amount of combustion type NOX is reduced from the source.
Drawings
FIG. 1 is a schematic view of the shape structure of a burner with a slit-shaped combustion air outlet;
FIG. 2 is a sectional view of a burner nozzle having a combustion air outlet in the form of a slit;
FIG. 3 is a schematic view of the structure of a burner nozzle with a swirl-type combustion air outlet;
FIG. 4 is a sectional view of a burner nozzle having a combustion air outlet in the form of a slit;
FIG. 5 is a right side elevational view of the configuration of FIGS. 1 and 3;
FIG. 6 is a view showing the state of use of the present invention in a roller hearth furnace and a walking beam type sheet metal heating furnace.
In the figure:
1-ignition electrode 2-gas spray pipe 3-burner outlet fixed baffle 4-burner shell 5-refractory material 6-gas distribution ring 7-ignition electrode joint 8-combustion-supporting air spray pipe 9-peephole 10-flame monitoring device 11-combustion-supporting air channel 12-combustion-supporting air pipe flange 13-gas channel 14-gas channel flange 15-orifice plate 16-combustion-supporting air ejection circular seam 17-burner mounting flange 18-combustion-supporting air ejection central pipe 19-combustion-supporting air swirler 20-furnace wall 21-heated steel plate 22-furnace roller 23-bearing seat A-gas coating type low-nitrogen non-oxidation burner.
Detailed Description
The fuel gas cladding type low-nitrogen non-oxidation burner provided according to the technical scheme has the core originality that: the combustion-supporting air channel is arranged at the central position of the burner, and the fuel channel is arranged at the outer side of the combustion-supporting air channel of the burner, so that in the diffusion combustion process, fuel is firstly contacted with the surface of a hot billet, and the surface of the billet is prevented from being oxidized and burned; meanwhile, a combustion air channel at the center of the burner is set to be a slit type or cyclone type nozzle, so that quasi-secondary air is formed for dispersed combustion in the combustion process, and the generation amount of NOx is greatly reduced. Really realizes the low-nitrogen non-oxidation combustion of the industrial furnace with energy conservation, emission reduction and oxidation burning loss prevention.
The invention is further explained by combining the drawings in the specification and provides an embodiment of the invention.
The gas-coated low-nitrogen non-oxidation burner comprises a burner shell 4, and a gas device, a combustion air spraying device, an ignition device and a flame monitoring device which are arranged in the burner shell, and is characterized in that: the combustion-supporting air spraying device comprises a combustion-supporting air channel 11, a combustion-supporting air spraying pipe 8 and a combustion-supporting air spraying nozzle, and the combustion-supporting air spraying pipe 8 is arranged at the center of the burner shell 4; the method is characterized in that: the gas spray pipes 2 are dispersedly arranged in the outer layer refractory material layer 5 taking the combustion-supporting air spray pipe 8 as the center, the front parts of the gas spray pipes are inclined to the center of the burner by a certain curvature and are coated outside the combustion-supporting air spraying annular seam 16 arranged at the front end of the combustion-supporting air spray pipe 8 or the combustion-supporting air swirler 19, so that a coated low-nitrogen non-oxidation burner structure is formed, and a coated low-nitrogen non-oxidation combustion state with low middle flame temperature and high outer ring temperature is formed when the burner works.
In practical implementation, the clad low-nitrogen non-oxidizing burner provided by the invention can adopt two structural modes:
FIGS. 1 and 2 show a slit-injection type gas-fired clad low-nitrogen non-oxidizing burner;
the attached figures 3 and 4 show combustion air spiral-flow type jet type gas cladding type low-nitrogen non-oxidizing burner.
Example 1
The gas-coated low-nitrogen non-oxidation burner comprises a burner shell 4, and a gas device, a combustion air spraying device, an ignition device and a flame monitoring device which are arranged in the burner shell, and is characterized in that: the combustion-supporting air spraying device comprises a combustion-supporting air channel 11, a combustion-supporting air spraying pipe 8 and a combustion-supporting air spraying nozzle, and the combustion-supporting air spraying pipe 8 is arranged at the center of the burner shell 4; the gas spray pipes 2 are dispersedly arranged in the outer layer refractory material layer 5 taking the combustion-supporting air spray pipe 8 as the center, the front parts of the gas spray pipes are inclined to the center of the burner by a certain curvature and coated outside the combustion-supporting air spraying annular seam 16 arranged at the front end of the combustion-supporting air spray pipe 8, so that a coated low-nitrogen non-oxidation burner structure is formed, and a coated low-nitrogen non-oxidation combustion state with low middle flame temperature and high outer ring temperature is formed when the burner works.
The cone angle of the bent part at the front end of the gas nozzle 2, which is bent towards the center, is 6-15 degrees.
The gas channel 13 is provided with a gas distribution ring 6, and a throttle orifice 15 is arranged at the interface of the gas channel 13 and the gas nozzle 2.
The combustion-supporting air spraying device consists of a combustion-supporting air spraying pipe 8, a combustion-supporting air channel 11 and a combustion-supporting air spraying circular seam 16 or a combustion-supporting air swirler 19 which is arranged at the front end of the combustion-supporting air spraying pipe 8; the combustion-supporting air spray pipe 8 is arranged at the center of the burner body, the inner cavity of the combustion-supporting air spray pipe 8 is provided with a flame detection device 10 which penetrates through the cavity of the inner cavity, the pipe body at the rear part of the combustion-supporting air spray pipe is provided with a peephole 9 which is communicated with the inner cavity, and the flame detection device 10 and the peephole 9 form a flame monitoring device of the burner.
The ignition device is composed of an ignition electrode 1 and an ignition electrode joint 7, the ignition electrode joint 7 is positioned on the rear burner shell 4 of the burner body, and the ignition electrode 1 at the front part of the ignition electrode joint is positioned at the outlet of a gas nozzle between a combustion air nozzle 8 and the gas nozzle 2.
The working principle of the gas-coated low-nitrogen non-oxidation burner is as follows: the fuel gas is sprayed out from the fuel gas spray pipe 2, the combustion-supporting gas is sprayed out from a combustion-supporting gas spray pipe 8 arranged on the outer ring of the burner body, and after being ignited by the ignition electrode 1, diffusive combustion is carried out; meanwhile, combustion-supporting air is sprayed out through a combustion-supporting air spraying central pipe 18 arranged at the front end of the combustion-supporting air spraying pipe 8 and a combustion-supporting air spraying annular seam 16, at the moment, the outer side of the flame is a fuel gas layer, the center of the flame is combustion-supporting air, the whole combustion process is realized in a state that fuel gas coats the combustion-supporting air, and in the combustion process, the outer side of the flame is similar to reducing atmosphere, so that the oxidability of the surface of the heated metal is reduced; the center of the flame is similar to the oxidizing atmosphere, so that the center of the flame is in a low-temperature state; thereby inhibiting the generation of NOX from the source and achieving the purpose of reducing the content of NOX in the flue gas.
Example 2
The gas-coated low-nitrogen non-oxidation burner comprises a burner shell 4, and a gas device, a combustion air spraying device, an ignition device and a flame monitoring device which are arranged in the burner shell, and is characterized in that: the combustion-supporting air spraying device comprises a combustion-supporting air channel 11, a combustion-supporting air spraying pipe 8 and a combustion-supporting air spraying nozzle, and the combustion-supporting air spraying pipe 8 is arranged at the center of the burner shell 4; the gas spray pipes 2 are dispersedly arranged in an outer layer refractory material layer 5 taking a combustion-supporting air spray pipe 8 as a center, the front parts of the gas spray pipes are inclined to the center of the burner by a certain curvature and are coated outside a combustion-supporting air swirler 19 arranged at the front end of the combustion-supporting air spray pipe 8, so that a coated low-nitrogen non-oxidation burner structure is formed, and a coated low-nitrogen non-oxidation combustion state with low middle flame temperature and high outer ring temperature is formed when the burner works.
The cone angle of the bent part at the front end of the gas nozzle 2, which is bent towards the center, is 6-15 degrees.
The gas channel 13 is provided with a gas distribution ring 6, and a throttle orifice 15 is arranged at the interface of the gas channel 13 and the gas nozzle 2.
The combustion-supporting air spraying device consists of a combustion-supporting air spraying pipe 8, a combustion-supporting air channel 11 and a combustion-supporting air swirler 19 arranged at the front end of the combustion-supporting air spraying pipe 8; the combustion-supporting air spray pipe 8 is arranged at the center of the burner body, the inner cavity of the combustion-supporting air spray pipe 8 is provided with a flame detection device 10 which penetrates through the cavity of the inner cavity, the pipe body at the rear part of the combustion-supporting air spray pipe is provided with a peephole 9 which is communicated with the inner cavity, and the flame detection device 10 and the peephole 9 form a flame monitoring device of the burner.
The ignition device is composed of an ignition electrode 1 and an ignition electrode joint 7, the ignition electrode joint 7 is positioned on the rear burner shell 4 of the burner body, and the ignition electrode 1 at the front part of the ignition electrode joint is positioned at the outlet of a gas nozzle between a combustion air nozzle 8 and the gas nozzle 2.
The working principle of the gas-coated low-nitrogen non-oxidation burner is as follows:
the fuel gas is sprayed out from the fuel gas spray pipe 2, the combustion-supporting gas is sprayed out from a combustion-supporting gas spray pipe 8 arranged on the outer ring of the burner body, and after being ignited by the ignition electrode 1, diffusive combustion is carried out; meanwhile, combustion-supporting air is sprayed out through a combustion-supporting air swirler 19 arranged at the front end of the combustion-supporting air spray pipe 8, at the moment, the outer side of the flame is a fuel gas layer, the center of the flame is combustion-supporting air, the whole combustion process is realized in the state that fuel gas coats the combustion-supporting air, and in the combustion process, the outer side of the flame is similar to reducing atmosphere, so that the oxidability of the surface of the heated metal is reduced; the center of the flame is similar to the oxidizing atmosphere, so that the center of the flame is in a low-temperature state; thereby inhibiting the generation of NOX from the source and achieving the purpose of reducing the content of NOX in the flue gas.
Example 3
FIG. 5 is a schematic view showing the use of the gas-covered low-nitrogen non-oxidizing burner for a roller hearth metal heat treatment furnace.
In practical application, the coated low-nitrogen non-oxidizing burners are fixed on the furnace wall 20 and are respectively arranged above and below the heated steel plate 21. The heated steel plate 21 is firstly contacted with the fuel flame sprayed by the burner and coated outside in the heating process, so that the heated steel plate 21 is in a weak reducing atmosphere on site, and the effect of reducing the oxidation burning loss of the steel plate is achieved. The state of combustion flame in the furnace body can be known on the use site through the ignition electrode 7, the peephole 9 and the flame monitoring device 10 which are arranged at the rear side of each burner body, so that the optimal configuration of gas and combustion-supporting air is guided.
According to practical use, the method shows that: through practical tests, compared with the existing burner with the same power, the gas-coated low-nitrogen non-oxidation burner can reduce the oxidation burning loss by about 80%.
Really realizes the low-nitrogen non-oxidation combustion of the industrial furnace with energy conservation, emission reduction and oxidation burning loss prevention.
The above embodiments of the present invention are given by the applicant according to the technical solutions, and do not represent the whole of the present invention, and any modifications that are not substantial ideas and are made by those skilled in the art with reference to the technical solutions should be considered to fall within the protection scope of the present invention.
Claims (6)
1. The utility model provides a low nitrogen non-oxidation nozzle of gas cladding type, includes nozzle shell (4) and sets up gas device, combustion air jetter, ignition and the flame monitoring device in nozzle shell, its characterized in that: the combustion-supporting air spraying device comprises a combustion-supporting air channel (11), a combustion-supporting air spraying pipe (8) and a combustion-supporting air spraying nozzle, and the combustion-supporting air spraying pipe (8) is arranged at the center of the burner shell (4); the method is characterized in that: the gas spray pipes (2) are dispersedly arranged in an outer layer refractory material layer (5) taking a combustion-supporting air spray pipe (8) as a center, the front parts of the gas spray pipes are inclined to the center of the burner by a certain curvature and coated outside a combustion-supporting air spraying annular seam (16) or a combustion-supporting air swirler (19) arranged at the front end of the combustion-supporting air spray pipe (8), so that a coated low-nitrogen non-oxidation burner structure is formed, and a coated low-nitrogen non-oxidation combustion state with low middle flame temperature and high outer ring temperature is formed when the burner works.
2. The gas-fired clad low-nitrogen non-oxidizing burner of claim 1, wherein: the cone angle of the bent part at the front end of the gas spray pipe (2) bent towards the center is 6-15 degrees.
3. The gas-fired clad low-nitrogen non-oxidizing burner of claim 1, wherein: the gas channel (13) is provided with a gas distribution ring (6), and a throttling orifice plate (15) is arranged at the interface of the gas channel (13) and the gas spray pipe (2).
4. The gas-fired clad low-nitrogen non-oxidizing burner of claim 1, wherein: the combustion-supporting air spraying device consists of a combustion-supporting air spraying pipe (8), a combustion-supporting air channel (11) and a combustion-supporting air spraying annular seam (16) or a combustion-supporting air swirler (19) which is arranged at the front end of the combustion-supporting air spraying pipe (8); the combustion-supporting air spray pipe (8) is arranged at the center of the burner body, the inner cavity of the combustion-supporting air spray pipe (8) is provided with a flame detection device (10) penetrating through the cavity of the inner cavity, a peephole (9) communicated with the inner cavity is formed in the pipe body at the rear part of the combustion-supporting air spray pipe, and the flame detection device (10) and the peephole (9) form a flame monitoring device of the burner.
5. The gas-fired clad low-nitrogen non-oxidizing burner of claim 1, wherein: the ignition device is composed of an ignition electrode (1) and an ignition electrode joint (7), the ignition electrode joint (7) is located on a rear burner shell (4) of the burner body, and the ignition electrode (1) at the front part of the ignition electrode joint is located at a gas nozzle outlet between a combustion air nozzle (8) and a gas nozzle (2).
6. A gas cladding type low-nitrogen non-oxidation burner has the following combustion characteristics: the fuel gas is sprayed out from the fuel gas spray pipe (2), the combustion-supporting gas is sprayed out from the combustion-supporting gas spray pipe (8), and the fuel gas is ignited by the ignition electrode (1) and then subjected to diffusive combustion, at the moment, the outer side of the flame is a fuel gas layer, the center of the flame is combustion-supporting air, the whole combustion process is realized in a state that the fuel gas coats the combustion-supporting air, and in the combustion process, the outer side of the flame is similar to reducing atmosphere, so that the oxidability of the surface of the heated metal is reduced; the center of the flame is similar to the oxidizing atmosphere, so that the center of the flame is in a low-temperature state; thereby inhibiting the generation of NOX from the source and achieving the purpose of reducing the content of NOX in the flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910860009.2A CN110657433B (en) | 2019-09-11 | 2019-09-11 | Fuel gas cladding type low-nitrogen non-oxidation burner and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910860009.2A CN110657433B (en) | 2019-09-11 | 2019-09-11 | Fuel gas cladding type low-nitrogen non-oxidation burner and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110657433A true CN110657433A (en) | 2020-01-07 |
| CN110657433B CN110657433B (en) | 2023-12-29 |
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| CN201910860009.2A Active CN110657433B (en) | 2019-09-11 | 2019-09-11 | Fuel gas cladding type low-nitrogen non-oxidation burner and use method thereof |
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| CN113107722A (en) * | 2021-04-20 | 2021-07-13 | 山东大学 | Gas inlet mechanism for improving quality of mixed gas formed by high-power gas machine and control method |
| CN116972387A (en) * | 2023-07-06 | 2023-10-31 | 四川大学 | Smoke-suppressing flame separation combustion device for in-situ monitoring of combustion calorimeter and free radicals and combined analysis system |
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