CN217875845U - Multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner - Google Patents
Multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner Download PDFInfo
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- CN217875845U CN217875845U CN202221150599.3U CN202221150599U CN217875845U CN 217875845 U CN217875845 U CN 217875845U CN 202221150599 U CN202221150599 U CN 202221150599U CN 217875845 U CN217875845 U CN 217875845U
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 134
- 239000000463 material Substances 0.000 claims abstract description 3
- 210000000689 upper leg Anatomy 0.000 claims description 7
- 239000011449 brick Substances 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 abstract description 41
- 239000006185 dispersion Substances 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 239000003546 flue gas Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000000779 smoke Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
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- 230000003111 delayed effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
A multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner belongs to the technical field of thermal engineering. The utility model discloses NOx's emission has been reduced. Comprises a main nozzle and a secondary combustion air nozzle; the main nozzle consists of a central air nozzle, a primary combustion-supporting air nozzle and a gas nozzle; the secondary combustion-supporting air nozzle is separated from the main nozzle and arranged in parallel with the main nozzle; the burner block and the refractory burning material of the furnace wall are integrally cast and molded, and a main nozzle and a secondary combustion air nozzle channel are arranged on the burner block; the central air nozzle, the primary combustion air nozzle and the gas nozzle are connected in sequence and then connected with the channel on the burner block; a gas swirler is arranged in the gas nozzle, a primary combustion air swirler is arranged in the primary combustion air nozzle, and a secondary combustion air swirler is arranged in the secondary combustion air nozzle. Air and coal gas are sequentially sprayed into the furnace in a stepped manner through different nozzles by multi-stream high-speed rotating airflow, so that graded dispersion combustion is realized, the flame of the burner is elongated, and the production of NOx is effectively inhibited.
Description
Technical Field
The utility model relates to a multithread thigh hierarchical burning long flame ultralow NOx flame regulation nozzle that heating furnace or heat treatment furnace were used belongs to thermal technology field.
Background
The primary air and the secondary air of the traditional flame-adjusting burner enter a burner cavity through 1 concentric tube in front of a nozzle, and the flame length is adjusted by adjusting a flame adjusting valve arranged on a burner body; in the combustion process of the burner, because the high-speed sprayed secondary air wraps the primary air and the coal gas, a layer of air curtain is formed in a combustion area, the secondary air is sprayed at high speed to have entrainment effect, the sucked flue gas cannot enter the combustion area in time and is difficult to form an oxygen-poor combustion environment, so that the oxygen concentration and the flame temperature in the flame area of the burner are high, the generation of NOx is intensified, the oxidation burning loss rate of the billet in the heating process of the furnace is high, and the content of NOx in the flue gas discharged by the heating furnace is usually 150mg/Nm 3 (O in flue gas) 2 Content of 8 percent) above, and the content of NOx which can not meet the regulation of atmospheric pollutant ultra-low emission standard issued by the ministry of environmental protection is 100mg/Nm 3 (O in flue gas) 2 Content 8%) or less. The utility model discloses just under this kind of background, on having absorbed internal, the advanced combustion technology basis of foreign, the novel combustor of multithread thigh, stage combustion, ultralow NOx emission, flame length adjustable of development department.
SUMMERY OF THE UTILITY MODEL
Aiming at the defect of high NOx emission of the traditional flame regulating burner, the content of NOx in the NOx is 100mg/Nm in order to meet the regulation of the atmospheric pollutant ultra-low emission standard issued by the ministry of environmental protection 3 (O in flue gas) 2 Content below 8 percent), on the basis of digesting and absorbing domestic and foreign advanced combustion technologies, a novel multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner and a use method are developed, NOx emission is greatly reduced, a temperature field in a furnace is homogenized, oxidation burning loss of a billet in the heating process of the furnace is reduced, and heating quality and product quality are improved.
A multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner comprises a main nozzle and a secondary combustion air nozzle; the main nozzle consists of a central air nozzle, a primary combustion-supporting air nozzle and a gas nozzle;
the secondary combustion-supporting air nozzle is separated from the main nozzle and arranged in parallel with the main nozzle; the burner block and the refractory burning material of the furnace wall are integrally cast and molded, and a main nozzle and a secondary combustion air nozzle channel are arranged on the burner block; the central air nozzle, the primary combustion air nozzle and the coal gas nozzle are connected in sequence and then are connected with the channel on the burner block; the gas nozzle is internally provided with a gas swirler, the primary combustion air nozzle is internally provided with a primary combustion air swirler, and the secondary combustion air nozzle is internally provided with a secondary combustion air swirler.
The nozzle brick is provided with a nozzle passage which is circular, fan-shaped, crescent, circular, long round hole or elliptical hole with the shape of the secondary combustion air nozzle passage.
The air distribution and air quantity of the primary combustion air nozzle is designed according to 0-40% of the total combustion air quantity; the air distribution volume of the secondary combustion air nozzle is designed according to 60% -100% of the total combustion air volume.
The gas nozzle spray head d is formed by adopting heat-resistant alloy steel centrifugal precision casting and is assembled with the gas spray pipe in a welding mode.
The utility model discloses "multithread thigh fractional combustion long flame ultralow NOx flame adjusting nozzle" adopts the mechanism of fractional dispersion burning, and coal gas forms the rotatory air current of multithread thigh high speed after the coal gas swirler a in the coal gas nozzle, spouts through coal gas nozzle shower nozzle d, in the nozzle main jet channel f of burner block 5 with rotatory combustion-supporting air limit parcel, bian Jianglie rotatory mixture back, high-speed spout in the stove, carries out one-level dispersion burning; meanwhile, secondary combustion-supporting air rotates at a high speed through a secondary air cyclone c to form multi-stream rotating air, the multi-stream rotating air is sprayed into a hearth through a secondary air channel g, the secondary air and the incompletely combusted coal gas in the primary combustion are mixed in a rotating mode and are combusted at the same time, the secondary air rotating at a high speed sucks the smoke in the furnace to enter a combustion area in the spraying process, and the smoke dilutes a combustion area O 2 The concentration forms 'oxygen-poor' combustion atmosphere, thus not only increasing the flame length, obviously improving the mixing effect, avoiding generating local ultrahigh temperature area, effectively reducing the content of NOx in the combustion products,the content of the active carbon is less than 50mg/Nm 3 (O in flue gas) 2 Content 8%); meanwhile, the secondary combustion-supporting air is sucked when being injected into the furnace at a high speed, and a part of smoke in the furnace is sucked to a coal gas combustion area, so that the temperature uniformity of furnace gas along the width direction of the furnace is greatly improved, and the heating quality of the billet is improved.
The utility model has the following functional characteristics and beneficial effect:
the central combustion-supporting air nozzle 1 is mainly used for ensuring the rigidity of flame when the burner works at low load; the combustion air amount entering the burner through the central combustion air nozzle 1 accounts for about 5% of the total combustion air amount; when the burner burns, the central combustion air nozzle 1 is in a normally open state and is not adjusted; when the heat load of the heating furnace is reduced and partial burners need to be closed, the central combustion air nozzle 1 is always opened to cool the gas nozzle d and prevent high-temperature flue gas in the furnace from oxidizing and damaging the gas nozzle d.
The flame length of the burner is mainly adjusted by adjusting the primary combustion air quantity and the secondary combustion air quantity. During normal work, primary combustion-supporting air is sprayed out from the primary air nozzle 2 in a high-speed rotating mode, coal gas sprayed out from the middle coal gas nozzle 3 is wrapped in the middle and advances in a high-speed rotating mode, and the primary combustion-supporting air and the coal gas are continuously mixed and combusted in the advancing process, so that the combustion quality is guaranteed, and meanwhile the length of flame is guaranteed. The length of the flame is adjusted by adjusting the amount of the primary combustion air and the secondary combustion air. When the length of the flame needs to be lengthened, the primary combustion air amount is reduced, and the secondary combustion air amount is increased; when the length of the flame needs to be shortened, the primary combustion-supporting air quantity is increased, and the secondary combustion-supporting air quantity is reduced, so that the flame adjusting function is realized. The primary combustion-supporting air amount accounts for 0-40% of the total combustion-supporting air amount, and the secondary combustion-supporting air amount accounts for 60-100% of the total combustion-supporting air amount.
The utility model discloses make secondary air nozzle 4 haplopore, the level is arranged in on the main nozzle next door. When the furnace normally works, secondary combustion-supporting air is mixed with the incompletely combusted coal gas of the primary combustion in the furnace and is combusted at the same time, so that the attenuation of the flame ejection speed along the width of the furnace can be effectively reduced, and the length of the flame is prolonged; all in oneWhen the secondary combustion-supporting air nozzle 4 is separated from the main nozzle, when secondary air is sprayed into the furnace in a rotating mode at a high speed, a large amount of flue gas is sucked in an entrainment mode and enters a gas combustion area, the secondary combustion reaction is carried out on the flue gas and the incompletely combusted gas after the primary combustion-supporting air is used for supporting combustion, an oxygen-deficient combustion environment is formed, an obvious flame high-temperature area does not exist in the length direction of the whole flame, and NO is greatly inhibited X Production, lengthening flame length, realizing the dual effects of ultra-low NOx emission and homogenizing the temperature field in the furnace. The secondary combustion air amount accounts for 60-100% of the total combustion air amount.
The utility model discloses novel structure, brief, the main expression is at burner block 5 and the whole cast moulding of brickwork refractory pouring, and burner novel structure, practicality, wherein main nozzle combination spout passageway f can design into different shapes for circular, secondary air nozzle burner block spout g according to coal gas and combustion mechanism needs, like circular, fan-shaped, crescent, oval, slotted hole etc..
Low NOx achievement:
the utility model adopts a staged dispersion combustion mechanism, when primary combustion-supporting air is mixed with coal gas in the furnace for combustion, because the air quantity is in the range of 0-40% when the primary combustion is carried out, the combustion needs O 2 The serious shortage is not enough, simultaneously, the primary combustion-supporting air rotating at high speed wraps the coal gas and is sprayed into the furnace at high speed, and partial smoke is sucked into a combustion area, so that the combustion is incomplete in a primary combustion area, and a coal gas combustion area O 2 The concentration is low, an oxygen-deficient and reducing combustion atmosphere is formed, the temperature of the flame center of the primary combustion area is effectively reduced, and the generation of NOx is effectively inhibited in the area.
When the primary combustion is about to be finished, the secondary air high-speed rotating airflow from the secondary air nozzle 4 generates entrainment with primary combustion air and flue gas wrapping coal gas when being sprayed into the furnace, and a part of the flue gas in the furnace is entrained to a coal gas combustion area, so that the generation of NOx is effectively inhibited. The formation of NOx must be conditioned by a sufficiently high temperature and a combustion zone O 2 The concentration of (c). The utility model discloses a hierarchical dispersion combustion mode, one-level burning belong to the oxygen deficiency burning, therefore the regional flame central temperature of one-level burning passes relativelyThe flame regulating burner is low, the secondary combustion is that after the primary combustion, because the multi-stream rotary secondary air injected in the high-speed rotary manner entrains surrounding smoke, the smoke enters a primary combustion unburned combustion area for continuous combustion, and a 'lean oxygen' combustion atmosphere is formed in the secondary combustion area, so that the generation of NOx can be effectively inhibited. The utility model restrains the generation of NOx to the utmost extent from the structure and the combustion mechanism, and realizes the environmental protection function of low emission of NOx. The utility model discloses from the combustion mechanism on use hierarchical, multithread thigh dispersion combustion technique, when lengthening flame length, there is not obvious flame high-temperature region, about the lower 200 ℃ of the more traditional flame regulation nozzle of its flame high-temperature region temperature.
Drawings
FIG. 1 is a schematic structural view of a multi-strand staged combustion long flame ultra-low NOx flame-adjusting burner;
FIG. 2 isbase:Sub>A cross-sectional view A-A ofbase:Sub>A primary nozzle ofbase:Sub>A multi-stream staged combustion long flame ultra-low NOx flame-modulated burner;
FIG. 3 is a cross-sectional view B-B of a main nozzle of a multi-strand staged combustion long flame ultra-low NOx flame-regulating burner;
FIG. 4 is a view from the direction C of FIG. 1 showing the shape of the primary nozzle and secondary air nozzle burner blocks.
Wherein: the gas burner comprises a central air nozzle 1, a primary air nozzle 2, a gas nozzle 3, a secondary air nozzle 4, a burner block 5, a gas swirler a, a primary combustion air swirler B, a secondary combustion air swirler C, a gas burner d, a pressure measuring pipe e, a burner block main injection channel f, a secondary combustion air nozzle channel g, an ignition hole h, a fire observation hole i, a flange I A, a flange II and a flange plate C.
Detailed Description
Just below the utility model relates to a multithread thigh hierarchical burning long flame ultralow NOx flame adjusting nozzle and application method, it mainly includes: a primary nozzle combination and a secondary air nozzle. The main nozzle realizes the supply of central air, coal gas and primary combustion air to finish primary dispersion combustion, and consists of a central air nozzle 1, a primary air nozzle 2 and a coal gas nozzle 3; all coal gas for burning of the burner is sprayed out from the coal gas nozzle 3, a coal gas swirler a is arranged in the coal gas nozzle 3, and the coal gas swirler a has the function of rotating the coal gas sprayed into the furnace into a multi-stream high-speed rotating coal gas flow to strengthen dispersion and mixed burning with primary combustion air; the air supplied by the primary air nozzle 2 accounts for about 40% of the total theoretical combustion air, and the air swirler b is arranged to realize that the primary combustion air is sprayed into the furnace in a multi-flow strand form in a high-speed rotating manner, and when the primary combustion air is mixed with the coal gas, the primary combustion air and the coal gas are mutually wrapped, rotated and mixed in a multi-flow form, so that the air and the coal gas are mixed and combusted more uniformly and dispersedly, and primary dispersion combustion is realized in the furnace; the secondary combustion-supporting air nozzle 4 realizes the supply of secondary combustion-supporting air, in the process of spraying the secondary combustion-supporting air, after passing through a secondary air swirler, multi-stream rotating secondary air is formed, the secondary air is sprayed into a hearth at a high speed through the secondary combustion-supporting air nozzle, and after secondary dispersion combustion of coal gas is finished, the air supply amount of the secondary combustion-supporting air nozzle accounts for about 60-100% of the total theoretical combustion air; it is separated from the main nozzle and installed in parallel with the main nozzle; in addition, the main nozzle combination and the secondary air nozzle are not provided with burner blocks, the burner blocks are cast together with refractory castable of a furnace wall when burners are installed, and secondary air nozzle channels g of the burner blocks 5 can be designed into different shapes such as circles, sectors, crescent shapes, ellipses, long round holes and the like according to coal gas and combustion mechanism requirements.
Fig. 1, 2, 3, 4, show a multi-strand staged combustion long flame ultra low NOx flame modulated burner. In this embodiment, the multi-stream staged combustion long flame ultra-low NOx flame-modulated burner comprises: a main nozzle combination, a secondary air nozzle 4 and a burner block 5. The main nozzle combination and the secondary air nozzle 4 are assembled together through a flange plate C and installed on a furnace shell steel plate, and the burner block 5 is integrally cast and molded on a furnace wall refractory material.
The main nozzle realizes the supply of central air, coal gas and primary combustion air to complete primary combustion, and consists of a central air nozzle 1, a primary air nozzle 2 and a coal gas nozzle 3. The central air nozzle 1 is mainly used for ensuring the rigidity of flame when the burner is in combustion low-load operation; the combustion air amount entering the burner through the central air nozzle 1 is about 5 percent of the total combustion air amount; the burner is not adjusted when it is operating normally. The flame length is adjusted by adjusting the proportion of the primary combustion air and the secondary combustion air. When the burner brick works normally, primary combustion air rotates at a high speed through the air swirler b, and wraps multi-flow rotary coal gas sprayed from the middle coal gas nozzle 3 in the middle to advance at a high speed, and then the multi-flow rotary coal gas is sprayed into a hearth through a main nozzle channel f on the burner brick 5 to be combusted. In the advancing process, the primary combustion air and the coal gas are continuously mixed and combusted, so that the combustion quality is ensured, and the length of flame is also ensured. The flame length is adjusted by adjusting primary combustion air, so that the flame adjusting function is realized. The primary combustion air amount accounts for 0-40% of the total combustion air amount. In the embodiment, the central air nozzle 1, the primary air nozzle 2 and the gas nozzle 3 are connected into a whole by two groups of concentric flanges A, B; and the straight pipe sections of the gas nozzle 3 and the primary air nozzle 2 are provided with pressure detection holes e; and an ignition hole h is also arranged at the side part of the burner.
As shown in FIG. 4, the secondary air nozzle 4 is designed to be circular in the present embodiment. When the furnace normally works, secondary combustion-supporting air is mixed with coal gas in the furnace and is combusted, so that the attenuation of the flame ejection speed along the width of the furnace can be effectively reduced, and the length of the flame is prolonged; meanwhile, the secondary combustion-supporting air nozzle 4 is separated from the main nozzle, when the secondary combustion-supporting air is injected into the furnace in a multi-stream high-speed rotating mode, a large amount of flue gas is entrained and enters a coal gas area which is not completely combusted in the primary combustion, the secondary dispersion combustion is continued, the primary combustion is in an oxygen-poor atmosphere, the secondary combustion is carried out in an oxygen-poor combustion atmosphere, the flame does not have an obvious high-temperature area, secondary combustion-supporting air is supplied in a delayed mode, the length of the flame can be effectively lengthened, the production condition of NOx is restrained through the secondary dispersion combustion, and the environment-friendly requirement of ultralow emission of NOx is met. In addition, a fire observation hole i with a ball valve and heat-resistant glass is arranged at the end part of the secondary air nozzle 4 and is used for observing the combustion condition of the burner; and a pressure measuring pipe e is arranged on the straight pipe section of the secondary combustion air nozzle 4 and is used for pressure detection of burner calibration.
Claims (2)
1. The utility model provides a long flame ultralow NOx flame adjusting nozzle of multithread thigh fractional combustion which characterized in that: comprises a main nozzle and a secondary combustion air nozzle; the main nozzle consists of a central air nozzle, a primary combustion-supporting air nozzle and a gas nozzle;
the secondary combustion-supporting air nozzle is separated from the main nozzle and arranged in parallel with the main nozzle; the burner block and the refractory burning material of the furnace wall are integrally cast and molded, and a main nozzle and a secondary combustion air nozzle channel are arranged on the burner block; the central air nozzle, the primary combustion air nozzle and the gas nozzle are connected in sequence and then connected with the channel on the burner block; the gas nozzle is internally provided with a gas swirler, the primary combustion air nozzle is internally provided with a primary combustion air swirler, and the secondary combustion air nozzle is internally provided with a secondary combustion air swirler.
2. The multi-strand staged-combustion long-flame ultra-low NOx flame-modulated burner as claimed in claim 1, wherein: the nozzle brick is provided with a nozzle passage which is circular, fan-shaped, crescent, circular, long round hole or elliptical hole with the shape of the secondary combustion air nozzle passage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221150599.3U CN217875845U (en) | 2022-05-14 | 2022-05-14 | Multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221150599.3U CN217875845U (en) | 2022-05-14 | 2022-05-14 | Multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner |
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| CN217875845U true CN217875845U (en) | 2022-11-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115031234A (en) * | 2022-05-14 | 2022-09-09 | 北京首钢国际工程技术有限公司 | Multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner |
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- 2022-05-14 CN CN202221150599.3U patent/CN217875845U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115031234A (en) * | 2022-05-14 | 2022-09-09 | 北京首钢国际工程技术有限公司 | Multi-strand staged combustion long-flame ultralow NOx flame-adjusting burner |
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