CN210638039U - High-efficiency low-NOx two-stage self-preheating burner - Google Patents
High-efficiency low-NOx two-stage self-preheating burner Download PDFInfo
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- CN210638039U CN210638039U CN201921580703.0U CN201921580703U CN210638039U CN 210638039 U CN210638039 U CN 210638039U CN 201921580703 U CN201921580703 U CN 201921580703U CN 210638039 U CN210638039 U CN 210638039U
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- 239000007789 gas Substances 0.000 claims abstract description 160
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000003546 flue gas Substances 0.000 claims abstract description 66
- 238000002485 combustion reaction Methods 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 2
- 230000008676 import Effects 0.000 abstract description 6
- 239000002918 waste heat Substances 0.000 abstract description 2
- 239000000567 combustion gas Substances 0.000 description 10
- 238000009826 distribution Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 239000002737 fuel gas Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 206010066054 Dysmorphism Diseases 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 230000008646 thermal stress Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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
Abstract
The utility model provides a high-efficient low NOx second grade self preheating type nozzle, which comprises a housin, the air conduit, the gas conduit, the flue gas conduit, the combustion chamber, from cooling electrode, have air intlet on the casing, the exhanst gas export, the gas import, the gas conduit is fixed in the air conduit and is communicate with the gas import, the air conduit overcoat is equipped with the one-level heat exchanger that forms air passage with the air conduit cooperation, the flue gas conduit suit forms the flue gas passageway of intercommunication exhanst gas export on the surface of one-level heat exchanger, be equipped with the second grade heat exchanger of suit on the air conduit surface in the casing, the second grade heat exchanger is equipped with a plurality of heat exchanger passageways I, heat exchanger passageway II with the flue gas passageway intercommunication, the both ends of. The utility model discloses can carry out the heat transfer of two-stage to the air, effectively improve the efficiency of heat transfer, improve the preheated air temperature maximize, utilize the waste heat of flue gas to fully preheat the air, improve combustion efficiency, greatly improve the energy-conserving level from preheating the nozzle.
Description
Technical Field
The utility model relates to a structure of self preheating type nozzle, concretely relates to high-efficient low NOx second grade self preheating type nozzle.
Background
Industrial production activities are the main causes of energy and environmental problems, and equipment such as industrial furnaces and kilns are the main sources of air pollution and are also high-energy-consumption industrial equipment. The burner is one of the most important devices of the industrial furnace, and directly determines the energy consumption and pollutant discharge amount of the industrial furnace. Self-preheating burners are a typical type of industrial kiln burners, which act as both a burner and a fume extractor and are operated simultaneously. However, the conventional self-preheating burner has a single combustion mode and is always low in heat exchange efficiency; meanwhile, when the traditional burner structure is used in a conventional combustion mode with high air preheating temperature, the generation amount of pollutants such as NOx is large, and the environmental protection standard is difficult to meet.
Disclosure of Invention
In order to overcome the not enough of prior art, the utility model provides a high-efficient low NOx second grade self preheating type nozzle.
The utility model provides a technical scheme that its technical problem adopted is:
a high-efficiency low-NOx secondary self-preheating burner comprises a shell, an air guide pipe, a gas guide pipe, a flue gas guide pipe, a combustion chamber and a self-cooling electrode, wherein the shell is provided with an air inlet, a flue gas outlet and a gas inlet, the shell is sleeved on the outer part of the rear end of the air guide pipe, the gas guide pipe is fixed in the air guide pipe and communicated with the gas inlet, the combustion chamber is arranged at an opening at the front end of the air guide pipe, an ignition end of the self-cooling electrode is arranged in the combustion chamber, a primary heat exchanger matched with the air guide pipe to form an air channel is sleeved outside the air guide pipe, the flue gas guide pipe is sleeved on the surface of the primary heat exchanger to form a flue gas channel communicated with the flue gas outlet, a secondary heat exchanger sleeved on the surface of the air guide pipe is arranged in the shell, the secondary heat, and two ends of the heat exchanger channel I are respectively communicated with an air inlet and an air channel.
The utility model discloses in, the second grade heat exchanger includes shell, a plurality of channel member annular distribution are in the inner chamber of shell, heat exchanger channel I, heat exchanger channel II are formed in the inner chamber of shell by a plurality of channel member annular distributions, are equipped with the streaming baffle of a plurality of perpendicular to flue gas passageway gas flow direction in the heat exchanger channel II.
The utility model discloses in, the shell includes first flange, second flange, heat exchanger outer wall, heat exchanger inner wall, the heat exchanger inner wall sets up and forms the casing subassembly in the heat exchanger outer wall, first flange, second flange set up respectively on the casing subassembly both ends.
The utility model discloses in, the channel member is any one in thin wall metal sheet or the dysmorphism slit steel pipe, the both ends of thin wall metal sheet or dysmorphism slit steel pipe are connected respectively and are formed a second grade heat exchanger that has two kinds of gas medium passageway alternate distributions on first flange, second flange.
The utility model discloses in, the casing includes air casing and fixes the gas casing on air casing surface, air intlet and exhanst gas outlet set up on air casing, gas intlet sets up on gas casing.
The utility model discloses in, be provided with the gas pipe in the gas pipe, the one end of gas pipe extends to outside the casing.
The utility model discloses in, the channel member is the heat transfer pipe, and the both ends of heat transfer pipe are connected respectively on first flange, second flange, the circular lumen by the heat transfer pipe of heat exchanger passageway I forms.
The utility model discloses in, second grade heat exchanger includes first flange, second flange, a plurality of parallel arrangement's bypass flow baffle, passageway component, the passageway component is the heat transfer pipe, and the heat transfer pipe runs through the bypass flow baffle, and first flange, second flange ring cover are at the air duct surface, and the bypass flow baffle is fixed in the air casing and along the alternative interval distribution of air casing extending direction, and the one end of heat transfer pipe is fixed to be set up on first flange, and the other end of heat transfer pipe is fixed on the second flange.
The utility model discloses in, be equipped with the shunt on the gas pipe, the shunt is equipped with the reposition of redundant personnel passageway in intercommunication one-level gas hole.
The utility model discloses in, still include the wind dish, the wind dish cup joints on the shunt surface, and the wind dish surface is provided with the wind channel along the circumferencial direction, wind channel intercommunication combustion chamber and air conduit's inner space.
The utility model has the advantages that:
1. the two-stage heat exchanger is added on the basis of the self-preheating burner of the conventional one-stage heat exchanger, air enters the two-stage heat exchanger and exchanges heat with high-temperature flue gas, the flue gas is discharged after being reduced in temperature, the air is heated through primary heat exchange, the high-temperature flue gas after burning of the burner is heated through secondary heat exchange of the air in the air guide pipe through the one-stage heat exchanger when flowing back to the burner, namely, the air is subjected to two-stage heat exchange, the heat exchange efficiency is effectively improved, the temperature of the preheated air is improved to the maximum extent, the air is fully preheated by utilizing the waste heat of the flue gas, the combustion efficiency is improved, and the energy-;
2. flue gas and air carry out the dividing wall formula heat transfer in slit-shaped heat exchanger passageway, have improved heat exchange efficiency by a wide margin. Compared with a circular heat exchanger channel (i.e. the secondary heat exchanger in embodiment 2), the heat exchange area of the heat exchanger channel is larger under the same heat exchanger volume; under the same heat exchange area, the heat exchange coefficient of the heat exchanger channel is larger.
3. The gas input control structure adopting the slit-shaped heat exchanger channel is simple, and the gas is controlled and input by only adopting one gas inlet, so that the gas control structure is simplified, the control efficiency is improved, and the control cost is reduced.
4. The flue gas at 1050 ℃ can exchange heat with air by adopting a slit-shaped heat exchanger channel, and then is discharged out of the burner at about 300 ℃.
5. The gas pipe and the gas pipe are arranged and are independently connected with a gas supply device, and the gas pipe is provided with a flow divider positioned in the combustion chamber, so that different combustion modes can be set according to the combustion condition of the burner or the requirement, the flow mode of the gas can be changed, the combustion efficiency is improved, the generation of NOx is reduced, and the purposes of energy conservation and emission reduction are achieved;
6. on the premise of gas classification, the air classification technology is combined, cooling air holes are formed in the surface of an air guide pipe, most of air enters the air guide pipe from a primary heat exchanger and reaches a combustion chamber, part of air enters the air guide pipe from the cooling air holes and is mixed with gas entering the combustion chamber, and part of air enters a heating space from a second annular gap and is mixed with gas near the outlet of the combustion chamber, primary combustion products and part of backflow flue gas in the heating space to be subjected to secondary combustion to form high-speed flame;
7. through at gas pipe surface suit installation spring to fix in the air casing through the installation spring, can guarantee the security and the steadiness of gas system structure when nozzle internal arrangement has the thermal expansibility to shift, and then improve the utility life of whole equipment and the security of use.
Drawings
The invention will be further explained with reference to the drawings and the embodiments below:
FIG. 1 is a schematic view of the internal structure of embodiment 1;
FIG. 2 is a schematic view showing a flow pattern of flue gas and air in example 1;
FIG. 3 is a side view of embodiment 1;
FIG. 4 is a schematic view showing another flow pattern of the flue gas and the air in example 1;
FIG. 5 is a schematic view showing a first arrangement of a passage member in example 1;
FIG. 6 is a schematic view showing a second arrangement of the passage member in example 1;
FIG. 7 is a schematic view showing a third mode of arranging a passage member in example 1;
FIG. 8 is a schematic view showing a fourth mode of arranging a passage member in example 1;
FIG. 9 is a schematic view showing that the short side of the cross section of the steel pipe with a special-shaped slit is square in example 1;
FIG. 10 is a schematic view showing that the short side of the cross section of the steel pipe with a shaped slit is arc-shaped in example 1;
FIG. 11 is a schematic structural view of a support member in example 1;
FIG. 12 is a sectional view of the internal structure of embodiment 2;
FIG. 13 is a schematic view of the flow pattern of the flue gas and air in example 2;
FIG. 14 is a schematic view showing another flow pattern of the flue gas and the air in example 2;
FIG. 15 is a schematic view showing a structure in which a channel member is a heat exchange tube in example 2;
FIG. 16 is a schematic view of the structure of the finned tube;
FIG. 17 is a schematic view of another angled configuration of the finned tube;
fig. 18 is a schematic structural view of embodiment 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.
Example 1
Referring to fig. 1-8, a high-efficiency low-NOx secondary self-preheating burner comprises a shell, an air duct 22, a gas duct 23, a flue gas duct 18, a combustion chamber 25 and a self-cooling electrode 4; the shell comprises an air shell 8 sleeved on the outer portion of the rear end of the air guide pipe 22 and a gas shell 6 fixed on the outer surface of the air shell 8, an air inlet 2 and a flue gas outlet 3 are arranged on the air shell 8, the relative positions of the air inlet 2 and the flue gas outlet 3 are adjustable, the application under different environments is met, a gas inlet 1 is arranged on the gas shell 6, and a heat-insulating lining 7 is arranged between the air shell 8 and the gas shell 6; the one end cover of gas pipe 23 is equipped with installation spring 16 and fixes in air pipe 22 through installation spring 16, simultaneously with gas import 1 intercommunication, gas pipe 23 fixes in air casing 8 through installation spring 16, can guarantee the security and the steadiness of gas system structure when the nozzle internal arrangement has thermal expansibility to shift, and then improves the safety of whole equipment's practical life and use. The combustion chamber 25 is provided at the front end opening of the air guide 22 with a first annular gap left, and the firing end from the cooling electrode 4 is provided in the combustion chamber 25 and is ventilation-cooled by the cooling tuyere 5. The air guide pipe 22 is externally sleeved with a primary heat exchanger 20 which is matched with the air guide pipe 22 to form an air channel 21, one end of the primary heat exchanger 20 extends to the combustion chamber 25 to form a second annular gap with the outlet of the combustion chamber 25, and a plurality of groups of concave-convex fins are uniformly arranged on the outer surface of the primary heat exchanger 20. The air conduit 22 is provided with a cooling air hole 17 which leads the inner cavity of the air conduit 22 to be communicated with the air channel 21; the flue gas duct 18 is sleeved on the surface of the primary heat exchanger 20 to form a flue gas channel 19 communicated with the flue gas outlet 3. The gas guide pipe 23 comprises a primary gas hole 27 positioned on the outline of the gas guide pipe 23 and a secondary gas hole 28 formed by a pipe orifice at the front end of the gas guide pipe 23. The air-conditioning heat exchanger is characterized in that a secondary heat exchanger 10 sleeved on the surface of an air guide pipe 22 is arranged in the shell, the secondary heat exchanger 10 is arranged in the air shell 8, the secondary heat exchanger 10 is provided with a plurality of heat exchanger channels I13 used for entering air and heat exchanger channels II 13' communicated with a flue gas channel 19, and two ends of the heat exchanger channels I13 are respectively communicated with an air inlet 2 and an air channel 21.
In this embodiment, the secondary heat exchanger 10 includes a housing and a plurality of channel members 33, the plurality of channel members 33 are annularly distributed in an inner cavity of the housing to form a plurality of heat exchanger channels i 13 with slit-shaped cross sections, and a heat exchanger channel ii 13' communicating with the flue gas channel 19 is left, and two ends of the heat exchanger channel i 13 are respectively communicated with the air inlet 2 and the air channel 21. The flue gas and the air are subjected to dividing wall type heat exchange in the slit-shaped heat exchanger channel I13 which is alternately distributed in the secondary heat exchanger 10, so that the heat exchange efficiency is greatly improved, and compared with a conventional heat exchanger, the heat exchange area of the heat exchanger channel I13 is larger under the condition of the same heat exchanger volume; under the same heat exchange area, the heat exchange coefficient of the heat exchanger channel I13 is larger.
In the present embodiment, as shown in fig. 1, a plurality of bypass baffles 14 are arranged in the heat exchanger channel ii 13 'and are alternately distributed in the heat exchanger channel ii 13' and are perpendicular to the gas flowing direction of the flue gas channel 19, and the channel member 33 penetrates through the bypass baffles 14 and is installed in the housing. Furthermore, the total number of the bypass baffles 14 is even, and the heat exchanger channel II 13' is divided into a plurality of cavities by the bypass baffles 14 with the even number, and the total number of the cavities is odd, so that the structure can increase the gas flowing stroke of the flue gas channel 19 and increase the heat exchange time.
In this embodiment, as shown in fig. 1 to 11, the housing includes a first flange 11, a second flange 12, a heat exchanger outer wall 30, and a heat exchanger inner wall 29, the heat exchanger inner wall 29 is disposed in the heat exchanger outer wall 30 to form a housing assembly, the first flange 11 and the second flange 12 are respectively disposed at two ends of the housing assembly, and the first flange 11 and the second flange 12 are both provided with openings corresponding to the positions of the heat exchanger channel i 13, so that the heat exchanger channel i 13 can be normally communicated with the air inlet 2 and the air channel 21. Meanwhile, the heat exchanger outer wall 30 and the air casing 8 form a cooling channel 9 communicated with the air inlet 2, so that the temperature of the air casing 8 is greatly reduced.
In this embodiment, as shown in fig. 1 to 11, the channel member 33 includes any one of a thin-wall metal plate or a special-shaped slit steel pipe, two ends of the thin-wall metal plate or the special-shaped slit steel pipe are respectively connected to the first flange 11 and the second flange 12 to form a secondary heat exchanger 10 having two gas medium channels distributed alternately, where the two gas medium channels are a heat exchanger channel ii 13' and a heat exchanger channel i 13. And when the channel member 33 is a thin-wall metal plate, the left and right ends of the thin-wall metal plate are respectively connected with the first flange 11 and the second flange 12, and the upper and lower sides thereof are respectively connected with the outer wall 30 of the heat exchanger and the inner wall 29 of the heat exchanger, so that the cross-sectional shapes of the heat exchanger channel II 13 ' and the heat exchanger channel I13 are both slit-shaped cavities, and when the cross-sectional shapes of the heat exchanger channel II 13 ' and the heat exchanger channel I13 are both slit-shaped cavities, the heat exchanger channel II 13 ' and the heat exchanger channel I13 are alternately spaced and annularly arranged. The channel member 33, the first flange 11, the second flange 12, the heat exchanger outer wall 30 and the heat exchanger inner wall 29 are connected and installed into a whole by welding and the like.
Referring to fig. 5 to 11, in this embodiment, the wall thickness of the thin-wall metal plate or the special-shaped slit steel pipe is within 0.3 to 1.0mm, so as to ensure the heat exchange efficiency and the use strength of the heat exchange surface. In order to ensure the maximum heat exchange efficiency of the secondary heat exchanger 10, the length of the slit of the heat exchanger channel I13 is larger than 10mm, the width of the slit is not larger than 8mm, the structure can ensure the maximum air flow area of the heat exchanger channel I13, and the heat exchange efficiency is improved. When the length of the slit is too large, turbulence and thermal stress between adjacent heat exchange surfaces may occur, and it is necessary to add a support member 31 in the length direction of the slit-shaped tube, wherein the support member 31 is formed by, but not limited to, casting and external extrusion. In the above structure, as shown in fig. 9 and 10, the short side of the section of the shaped slit steel pipe may be square or arc-shaped to facilitate positioning and fixing.
In this embodiment, the heat exchanger channel i 13 may be formed by connecting a plurality of thin-walled metal plates to the heat exchanger outer wall 30 and the heat exchanger inner wall 29, respectively, as shown in fig. 5, which is a first arrangement; the heat exchanger channel I13 can also be formed by connecting a plurality of special-shaped slit steel pipes to the first flange 11 and the second flange 12, and the special-shaped slit steel pipes are connected with the supporting piece 31 to strengthen the strength thereof, as shown in FIG. 6, which is a second arrangement mode; the heat exchanger channel I13 can also be formed by connecting a plurality of special-shaped slit steel pipes to the first flange 11 and the second flange 12, as shown in FIG. 7, which is a third arrangement mode; the heat exchanger channel i 13 can be formed by connecting a plurality of special-shaped slit steel pipes to the first flange 11 and the second flange 12, and the plurality of special-shaped slit steel pipes are divided into two or more annular special-shaped slit steel pipe groups to improve the heat exchange quality, as shown in fig. 8, which is a fourth arrangement mode.
In this embodiment, the utility model discloses still include wind dish 26, wind dish 26 cup joints on the shunt surface, and wind dish 26 surface is provided with the wind channel along the circumferencial direction, and the wind channel communicates combustion chamber 25 and air conduit 22's inner space. The end of the self-cooling electrode 4 is mounted on the wind plate 26, the two are combined and then integrally placed in the combustion chamber 25, and the relative positions of the gas conduit 23 and the combustion chamber 25 are fixed by the bracket 24. After passing through the gas duct 23, the gas entering from the gas inlet 1 is divided into two stages in the combustion chamber 25, which are close to the air plate 26, wherein: the primary combustion gas is discharged through the primary combustion gas hole 27 near the air disc 26 to form primary combustion gas, the secondary combustion gas is directly sprayed out from the position, close to the outlet of the combustion chamber 25, of the secondary combustion gas hole 28 to form secondary combustion gas, and in the process, the primary combustion gas flow accounts for 10-50% of the total combustion gas flow formed by adding the primary combustion gas flow and the secondary combustion gas flow. In the structure, second grade gas hole 28 can be inboard in combustion chamber 25 export, also can stretch out in the combustion chamber 25 outside through extension gas pipe 23, and this length is decided to the demand of flame when nozzle in-service use, the utility model discloses can form the two hierarchical burning of gas air with outer burning condition in combustion chamber 25.
In this embodiment, the gas conduit 23 is provided with a flow divider, the flow divider is provided with a plurality of flow dividing channels communicated with the first-stage gas holes 27, and the flow dividing channels are annular air channels or a plurality of holes distributed along an annular shape. The utility model discloses a setting of shunt can change the distribution mode of gas, improves combustion efficiency, reduces NOx's production, reaches energy saving and emission reduction's purpose.
In this embodiment, the secondary heat exchanger 10 may be arranged in a single row in the air casing 8, or the secondary heat exchanger 10 may be modularized, and then n layers are added in the air casing 8, so as to be applied to a high power specification burner.
The burner system of this embodiment generally adopts ON/OFF pulse type control mode, and this embodiment, only a gas import, so only need a control valve to control the supply of gas can, the burner that this embodiment provided is fit for using ON the not high place of flow control precision requirement, utilize the gas import 1 input gas with gas pipe 23 intercommunication, the gas passes through one-level gas hole 27, the automatic reposition of redundant personnel of the structural design of second grade gas hole 28 and shunt becomes one-level and second grade, no matter low temperature mode or intensification mode, this moment one-level gas flow accounts for in 10~50% of total import flow, form the gas this moment, the two hierarchical burning of air. The working principle of this embodiment is therefore as follows:
(1) at low temperature, the burner controller gives an operation signal, the gas inlet 1 supplies gas, the gas enters the gas guide pipe 23 and then enters the combustion chamber 25, the gas is sprayed out from the primary gas hole 27 part and then is mixed with primary air passing through the air disc 26, the gas is ignited (simultaneously detects a flame signal) by the self-cooling electrode 4 and then is combusted, and a combustion product is mixed with secondary air at the outlet of the primary heat exchanger 20 and the secondary gas hole 28 for secondary combustion, so that gas and air double-staged combustion is carried out. The air-gas double-stage combustion mode is matched with a specific burner structure, ultra-low NOx emission can be met at low-temperature load or low-temperature rise, and the primary gas flow accounts for 10-50% of the total gas flow of the primary gas flow and the secondary gas flow.
(2) When the temperature is high (850 ℃), the control system switches a flameless control high-temperature mode, the gas inlet 1 supplies gas, the self-cooling electrode 4 does not ignite and is not detected, the air still enters the heating space from the combustion chamber 25 and the outlet of the first-stage heat exchanger 20 in two stages, the first-stage gas hole 27 enters the combustion chamber 25, is mixed with the first-stage air, is mixed with the secondary air at the outlet of the combustion chamber 25 and the second-stage gas hole 28, and is directly sprayed into the heating space for mild dispersion combustion, so that local high-temperature flame and a local high-temperature area do not exist, and ultralow NOx emission is realized.
(3) Under two kinds of temperature operating mode, high temperature flue gas carries out the one-level heat exchange by the air in flue gas passageway 19 and the air duct 21, later gets into in the second grade heat exchanger 10 and carries out the second grade heat exchange with the air in the heat exchanger passageway I13, and the flue gas of flue gas passageway 19 can increase the stroke through the bypass baffle 14 this moment, increases the heat transfer time, later by the low temperature flue gas of exhanst gas outlet 3 discharge.
(4) Under two temperature operating modes, air enters a cooling channel 9 of a cooling air shell 8 from an air inlet 2, then enters a secondary heat exchanger 10, enters a slit-shaped heat exchanger channel I13 through a first flange 12, exchanges heat with flue gas between adjacent heat exchanger channels I13, enters an air channel 21, exchanges heat with the flue gas in a flue gas channel 19 through a primary heat exchanger 20 again, and then is used for supporting combustion.
In the above structure, preferably, the channel member 33 is a shaped slit steel pipe, and fig. 2 is a schematic flow diagram of the flue gas and the air in the present embodiment, as can be seen from the figure, the heat exchanger channel i 13 in the present embodiment is formed by a pipe cavity of the shaped slit steel pipe, the heat exchanger channel ii 13' is formed by an inner cavity of the housing, and the flow-around baffle 14 is located in the inner cavity of the housing, so in the present embodiment, the flow stroke of the flue gas is increased by the flow-around baffle 14, the heat exchange time of the flue gas can be prolonged, and the heat exchange effect can be improved. Furthermore, the positions of the heat exchanger channel I13 and the heat exchanger channel II 13 'can be adjusted on the secondary heat exchanger 10 according to actual requirements so as to achieve the purpose of changing the flowing positions of the flue gas and the air, as shown in the figure, the figure 4 is a schematic diagram of another flowing mode of the flue gas and the air, in the figure, the heat exchanger channel I13 is formed by an inner cavity of a shell, the heat exchanger channel II 13' is formed by a tube cavity of a special-shaped slit steel tube, and the flowing stroke of the air is increased by the flow-around baffle plate 14, so that more flue gas heat can be taken away by the air, and the heat exchange effect is improved.
Example 2
Referring to fig. 12 to 17, the structure of the present embodiment is substantially the same as that of embodiment 1, except that: be provided with gas pipe 31 in the gas pipe 23, outside the one end of gas pipe 31 extended to the casing, gas pipe 23 and gas pipe 31 all connected alone and supply gas equipment to realize that one of them of gas pipe 23 and gas pipe 31 supplies gas alone or by the purpose of gas pipe 23 and gas pipe 31 simultaneous gas supply. Further, the channel member 33 is a heat exchange conduit, two ends of the heat exchange conduit are respectively connected to the first flange 11 and the second flange 12, the heat exchanger channel I13 is formed by a circular tube cavity of each heat exchange conduit, namely the cross section of a single heat exchanger channel I13 is circular, and the heat exchange conduit can be made of any one of a straight tube, a spiral tube, a surface special-shaped processing tube and a finned tube.
In this embodiment, because one path of gas supply is additionally provided, two control valves are required to control the two paths of gas supply in this embodiment, the burner provided in this embodiment is suitable for being applied to a place with a high requirement on gas flow control, and one end of the gas inlet 1 communicated with the gas conduit 23 and one end of the gas pipe 31 extending out of the housing are used as two paths of gas input ports to input gas, wherein the first path of gas input port is formed by the gas conduit 23 and the gas inlet 1, and the second path of gas input port is formed by the gas pipe 31; the fuel gas input from the fuel gas inlet 1 is divided into a first stage and a second stage by the arrangement of the first stage fuel gas hole 27, the second stage fuel gas hole 28 and the splitter, the proportion of the first stage fuel gas flow is the same as that of the embodiment 1, and the first stage fuel gas flow is mainly used for a low temperature mode and a heating mode; the other end of the gas pipe 31 directly leads into the vicinity of the outlet of the combustion chamber 25, and has two purposes, wherein the first path of gas input port which is used as a low temperature and a heating mode is insufficient in flow, at the moment, the gas has two stages of three stages of air, and the second path of gas is directly injected to perform flameless diffusion combustion as a high temperature mode, at the moment, the two stages of the first stage of gas are two stages of air, so the working principle of the embodiment is as follows:
(1) when the temperature is low (namely lower than a specific temperature, 850 ℃ in the embodiment), the burner controller gives an operation signal, an external gas supply system supplies gas, the gas enters a gas guide pipe 23 through a gas inlet 1 of a gas shell 6 and then enters a combustion chamber 25, air enters an air shell 8 through an air inlet 2, a part of the air enters a heat exchange guide pipe of a secondary heat exchanger 10 to exchange heat with return flue gas and then enters a primary heat exchanger 20, then enters an air guide pipe 22 through a second annular gap at the end part of the primary heat exchanger 20, enters the combustion chamber 25 through an air disc 26 after passing through a first annular gap, the other part of the air enters an air guide pipe 22 through a cooling air hole 17, the air entering the air guide pipe 22 enters the combustion chamber 25 after passing through the air disc 26, the gas is sprayed out from a flow dividing channel part of a flow divider and then is mixed with primary air passing through the air disc 26, is ignited through a cooling, the combustion products are mixed with the secondary gas ejected from the end of the gas duct 23 and further burned, and then mixed with the secondary air at the outlet of the primary heat exchanger 20 and burned again, and at this time, the direct-injection gas 32 can be supplied from the gas pipe 31 optionally according to the actual heat load, and the gas three-stage combustion can be performed. The air and gas double-stage combustion mode is matched with a specific burner structure, and ultra-low NOx emission can be met at low-temperature load or low-temperature rise.
(2) When the temperature is high (higher than 850 ℃), the supply of gas from the gas inlet 1 is closed, only the gas pipe 31 is reserved for supply, the directly-injected gas 32 is sprayed out, meanwhile, the self-cooling electrode 4 is not ignited, air still enters the heating space from the combustion chamber 25 and the outlet of the first-stage heat exchanger 20 in two stages, the gas directly enters the heating space from the gas pipe 31, dispersed flameless combustion is carried out in a high-temperature environment, a local high-temperature area is avoided, and ultralow NOx emission is realized.
(3) Under two kinds of temperature mode, the flue gas carries out the primary heat exchange by the air in flue gas pipe 18 and the primary heat exchanger 20, later gets into in the secondary heat exchanger 10 and carries out the secondary heat exchange with the air in the heat transfer pipe, and the flue gas runner can increase the stroke through around flowing baffle 14 this moment, increases the heat transfer time, later by the microthermal flue gas of exhanst gas outlet 3 discharge.
(4) Under two kinds of temperature operating modes, the air enters the air shell 8 after entering the air inlet 2, then enters the heat exchanger channel I13 of the secondary heat exchanger 10, exchanges heat with the flue gas of the heat exchanger channel II 13', then enters the air shell 8, and exchanges heat with the flue gas in the flue gas guide pipe 18 through the primary heat exchanger 20 again, and then is combustion-supporting.
In this embodiment, the positions of the heat exchanger channel i 13 and the heat exchanger channel ii 13' can also be adjusted on the secondary heat exchanger 10 according to actual requirements to achieve the purpose of changing the flow positions of the flue gas and the air, as shown in fig. 13 and fig. 14, where fig. 13 is a schematic diagram of the flow distribution of the air and the flue gas in this embodiment, and fig. 14 is a schematic diagram of the flow distribution of the air and the flue gas in another mode, and the advantages of the two air and flue gas flow distribution modes are substantially the same as those of the embodiment 1, and therefore, no description is given.
Example 3
Referring to fig. 18, the present embodiment has substantially the same structure as embodiment 2, except that: the secondary heat exchanger 10 does not include a shell, the secondary heat exchanger 10 includes a first flange 11, a second flange 12, a plurality of parallel-arranged bypass baffles 14 and a channel member 33, the channel member 33 is a heat exchange conduit, the heat exchange conduit penetrates through the bypass baffles 14, the first flange 11 and the second flange 12 are sleeved on the surface of the air conduit and fixed at two ends in the air shell 8, the bypass baffles 14 are fixed in the air shell 8 and distributed alternately at intervals along the extending direction of the air shell 8, one end of the heat exchange conduit is fixedly arranged on the first flange 11, and the other end of the heat exchange conduit is fixed on the second flange 12. And in the specific implementation, an insulating lining 7 must be added on the inner wall of the air shell 8.
When the heat exchange conduit adopts a harder tube such as a stainless steel tube, the heat exchange conduit is connected by adopting a metal melting mode such as brazing; when the heat exchange conduit is made of soft tubes such as a copper tube, extrusion type mechanical force connection such as turning, pressing and fixing can be selected, and the mounting flange on each side is divided into a/b two thin flanges.
The heat exchange conduit of the secondary heat exchanger 10 is arranged in a straight pipe or in a spring-type spiral annular arrangement to increase the heat exchange area; the heat exchange conduits can take the form of, but are not limited to, smooth round tubes, roughened tubes (surface machined to increase heat exchange area), and finned tubes (parallel, helical, or vertically arranged fins on the tubes).
To meet lower NOx emissions, the optional gas conduit 23 is ejected earlier than the gas pipe 31. In order to satisfy the overall heat exchange efficiency of the secondary heat exchanger 10 and the primary heat exchanger 20, the design efficiency and the exhaust gas temperature are realized. The heat exchange area A of the secondary heat exchanger 10 and the heat exchange area B of the primary heat exchanger 20 meet the condition that A =0.793e2.314BAnd (4) relationship.
The above description is only the preferred embodiment of the present invention, and the technical solutions of the objects of the present invention are all within the protection scope of the present invention as long as the objects are achieved by the substantially same means.
Claims (10)
1. A high-efficiency low-NOx two-stage self-preheating burner comprises a shell, an air conduit (22), a gas conduit (23), a flue gas conduit (18), a combustion chamber (25) and a self-cooling electrode (4), wherein the shell is provided with an air inlet (2), a flue gas outlet (3) and a gas inlet (1), the shell is sleeved on the outer portion of the rear end of the air conduit (22), the gas conduit (23) is fixed in the air conduit (22) and communicated with the gas inlet (1), the combustion chamber (25) is arranged at an opening at the front end of the air conduit (22), an ignition end of the self-cooling electrode (4) is arranged in the combustion chamber (25), a primary heat exchanger (20) matched with the air conduit (22) to form an air channel (21) is sleeved outside the air conduit (22), the flue gas conduit (18) is sleeved on the surface of the primary heat exchanger (20) to form a flue gas channel (19) communicated with the flue gas, the method is characterized in that: the heat exchanger is characterized in that a secondary heat exchanger (10) sleeved on the surface of an air conduit (22) is arranged in the shell, the secondary heat exchanger (10) is provided with a plurality of heat exchanger channels I (13) used for entering air and heat exchanger channels II (13') communicated with a flue gas channel (19), and two ends of the heat exchanger channels I (13) are respectively communicated with an air inlet (2) and an air channel (21).
2. The high-efficiency low-NOx secondary self-preheating burner of claim 1, wherein: the secondary heat exchanger (10) comprises a shell and a plurality of channel members (33), wherein the channel members (33) are annularly distributed in the inner cavity of the shell, the heat exchanger channel I (13) and the heat exchanger channel II (13 ') are formed by annularly distributing the channel members (33) in the inner cavity of the shell, and a plurality of flow-around baffles (14) which are perpendicular to the gas flowing direction of the flue gas channel (19) are arranged in the heat exchanger channel II (13').
3. The high-efficiency low-NOx secondary self-preheating burner of claim 2, wherein: the shell comprises a first flange (11), a second flange (12), a heat exchanger outer wall (30) and a heat exchanger inner wall (29), the heat exchanger inner wall (29) is arranged in the heat exchanger outer wall (30) to form a shell assembly, and the first flange (11) and the second flange (12) are respectively arranged at two ends of the shell assembly.
4. The high-efficiency low-NOx secondary self-preheating burner of claim 2, wherein: the channel component (33) is any one of a thin-wall metal plate or a special-shaped slit steel pipe, and two ends of the thin-wall metal plate or the special-shaped slit steel pipe are respectively connected to the first flange (11) and the second flange (12) to form a secondary heat exchanger (10) with two gas medium channels distributed alternately.
5. The high-efficiency low-NOx secondary self-preheating burner of claim 1, wherein: the casing includes air casing (8) and fixes gas casing (6) on air casing (8) surface, air intlet (2) and exhanst gas outlet (3) set up on air casing (8), gas intlet (1) sets up on gas casing (6).
6. The high-efficiency low-NOx secondary self-preheating burner of claim 1 or 5, wherein: be provided with gas pipe (31) in gas pipe (23), the one end of gas pipe (31) extends to outside the casing.
7. The high-efficiency low-NOx secondary self-preheating burner of claim 2, wherein: the channel component (33) is a heat exchange conduit, two ends of the heat exchange conduit are respectively connected to the first flange (11) and the second flange (12), and the heat exchanger channel I (13) is formed by a circular tube cavity of the heat exchange conduit.
8. The high-efficiency low-NOx secondary self-preheating burner of claim 6, wherein: the secondary heat exchanger (10) comprises a first flange (11), a second flange (12), a plurality of flow surrounding baffles (14) and a channel component (33), wherein the flow surrounding baffles (14) and the channel component (33) are arranged in parallel, the channel component (33) is a heat exchange conduit, the heat exchange conduit penetrates through the flow surrounding baffles (14), the first flange (11) and the second flange (12) are sleeved on the surface of the air conduit (22), the flow surrounding baffles (14) are fixed in the air shell (8) and are alternately distributed at intervals along the extending direction of the air shell (8), one end of the heat exchange conduit is fixedly arranged on the first flange (11), and the other end of the heat exchange conduit is fixed on the second flange (12).
9. The high-efficiency low-NOx secondary self-preheating burner of claim 1, wherein: the gas guide pipe (23) is provided with a flow divider, and the flow divider is provided with a flow dividing channel communicated with a first-stage gas hole (27).
10. The high efficiency low NOx secondary self-preheating burner of claim 8, wherein: the air distributor is characterized by further comprising an air plate (26), wherein the air plate (26) is sleeved on the surface of the flow divider, an air channel is arranged on the surface of the air plate (26) along the circumferential direction, and the air channel is communicated with the combustion chamber (25) and the inner space of the air conduit (22).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921193743X | 2019-07-26 | ||
| CN201921193743 | 2019-07-26 |
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| Publication Number | Publication Date |
|---|---|
| CN210638039U true CN210638039U (en) | 2020-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921580703.0U Withdrawn - After Issue CN210638039U (en) | 2019-07-26 | 2019-09-21 | High-efficiency low-NOx two-stage self-preheating burner |
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| CN (1) | CN210638039U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440256A (en) * | 2019-07-26 | 2019-11-12 | 佛山市科皓燃烧设备制造有限公司 | A kind of high efficency low NOx second level self preheating burner |
| CN113048477A (en) * | 2021-03-29 | 2021-06-29 | 北京兴达奇热工控制设备有限公司 | High-efficiency heat exchange low NOxExhaust burner |
-
2019
- 2019-09-21 CN CN201921580703.0U patent/CN210638039U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440256A (en) * | 2019-07-26 | 2019-11-12 | 佛山市科皓燃烧设备制造有限公司 | A kind of high efficency low NOx second level self preheating burner |
| CN110440256B (en) * | 2019-07-26 | 2024-03-19 | 佛山市科皓燃烧设备制造有限公司 | High-efficiency low NOx second-level self-preheating burner |
| CN113048477A (en) * | 2021-03-29 | 2021-06-29 | 北京兴达奇热工控制设备有限公司 | High-efficiency heat exchange low NOxExhaust burner |
| CN113048477B (en) * | 2021-03-29 | 2022-01-04 | 北京兴达奇热工控制设备有限公司 | High-efficiency heat exchange low NOxExhaust burner |
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