CN104566357A - Pulverized coal burner and boiler - Google Patents
Pulverized coal burner and boiler Download PDFInfo
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- CN104566357A CN104566357A CN201310518357.4A CN201310518357A CN104566357A CN 104566357 A CN104566357 A CN 104566357A CN 201310518357 A CN201310518357 A CN 201310518357A CN 104566357 A CN104566357 A CN 104566357A
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- air
- air duct
- flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
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Abstract
The invention discloses a pulverized coal burner and a boiler, which relate to a pulverized coal combustion technology, and solve the technical problem that NOx generation cannot be effectively restrained due to poor pulverized coal air flow dense-dilute separation effect and the like existing in the prior art. The pulverized coal burner comprises a central air duct, a primary air duct, a secondary air duct and a dual-section flow field generation structure arranged in the primary air duct, wherein the dual-section flow field generation structure can enable pulverized coal concentration of pulverized coal borne air flow which passes through the dual-section flow field generation structure and is ejected by the primary air duct to be distributed in a state of thick outside and diluted inside; a first annular recirculation zone is formed between the pulverized coal borne air flow with higher concentration and the pulverized coal borne air flow with lower concentration; a second annular recirculation zone is formed between the pulverized coal borne air flow with higher concentration and a secondary air flow ejected by an air flow channel formed between the secondary air duct and the primary air duct; a central recirculation zone is formed on a downstream region of the air flow with lower concentration. The boiler comprises the pulverized coal burner provided by the invention. According to the pulverized coal burner and the boiler provided by the invention, the generation of NOx can be more effectively restrained.
Description
Technical field
The present invention relates to pulverized coal combustion, be specifically related to a kind of coal burner and the boiler of this coal burner is set.
Background technology
Fluctuate in coal market, power demands declines, and the performance of enterprises improves by changing coal-fired structure in most of power plant.Meanwhile, the change of coal-fired structure and the huge difference between boiler actual motion ature of coal and former designing coal quality, cause burner outlet air velocity distribution chaotic, be difficult to satisfied rational air velocity distribution, burner ignition characteristic declines, NOx emission properties deteriorate.
NOx is nitric oxide (NO) and nitrogen dioxide (NO
2) etc. the general designation of multiple nitrogen oxide, being mainly derived from the combustion product of fuel, is a kind of main pollutant in air.Wherein, the fuel such as power boiler breeze is the primary combustion source that NOx produces.In order to reduce the NOx discharge in pulverized-coal fired boiler, prior art provides multiple coal burner.
Application number be 200610021753.6 application for a patent for invention disclose a kind of vortex burner, the paper being entitled as " burning optimization of vortex burner " has carried out experimental study to the burner with technical scheme disclosed in this patent, and discloses the research conclusion for this type burner.Research conclusion shows: this type burner arranges the main burner of 2 ~ 3 grades of coal powder light-dark separating mechanisms and wedge-shaped impression in First air passage, make the breeze airflow of First air along burner be formed radially from inside to outside by light to dense distributional pattern, realize breeze airflow air-coal separating, and by influencing each other with Secondary Air air-flow, between First air breeze airflow and the Secondary Air air-flow of surrounding, form annular return region.
As shown in Figure 1: in the downstream of coal burner outlet 11, be radially respectively thin powdered coal air-flow 14, thick coal culm air-flow 15 from burner axis 10, toroidal recirculation pattern 12 and Secondary Air air-flow 13; Breeze airflow concentrates near burner axis 10, presents the CONCENTRATION DISTRIBUTION state that surrounding is dense, center is light; Thick coal culm air-flow 15 periphery is the toroidal recirculation pattern 12 with certain negative pressure; The high-temperature flue gas that toroidal recirculation pattern 12 comes from the involute seat of burner hearth directly contacts with thick coal culm air-flow 15, is heated to more than ignition temperature, makes breeze airflow ecto-entad, initial burning gradually from dark to light, burning, is entering burning-out zone 16 burning and after-flame.Meanwhile, before entering burning-out zone 16, this coal burner can make thick coal culm air-flow 15 burn under oxygen debt reducing atmosphere condition, suppresses the generation of NOx.
Application number be 03111101.7 application for a patent for invention disclose a kind of center coal powder-feeding swirling, the paper being entitled as " numerical simulation of center coal powder-feeding swirling Gas-solid Two-phase Flow " discloses the research conclusion for this burner.Research conclusion shows: this burner makes the breeze airflow of First air be formed radially distribution from dark to light from inside to outside along burner by multiple eseparation ring, realizes breeze airflow air-coal separating; Utilize the turning effort of Secondary Air to form Central backflow area at the axial centerline of burner outlet, breeze airflow is lighted by volume seat high-temperature flue gas by Central backflow area simultaneously; Secondary Air classification is sent into, and realizes Researched of Air Staging Combustion Burning Pulverized Coal.
As shown in Figure 2: export the downstream of 21 at coal burner, radially form Central backflow area 24, thick coal culm air-flow 22, thin powdered coal air-flow 23 respectively from burner axis 20, and Secondary Air air-flow 25.In Central backflow area 24 near burner axis 20, entrainment the high-temperature flue gas heating breeze airflow come from burner hearth depths, the breeze airflow penetrated is caught fire gradually to thin powdered coal air-flow 23 from inside to outside, by thick coal culm air-flow 22, and burn in coal burner; Secondary Air air-flow 25 is coated on the outside also classification of the breeze airflow 22 caught fire and feeds, and enters burning-out zone 26 carry out mixed combustion with breeze airflow.Thick coal culm air-flow 22 is containing the most of coal dusts in breeze airflow, and before entering burning-out zone 26, this type burner can make thick coal culm air-flow 22 burn under oxygen debt reducing atmosphere condition, thus suppresses the generation of NOx.
Application number be 201010167308.7 application for a patent for invention disclose a kind of coal burner and comprise the pulverized-coal fired boiler of this coal burner, this technology is verified by practical engineering project, mainly contain as drawn a conclusion: this type burner is by adopting multiple coal dust separating tube and coal dust flow guiding cylinder, the First air pulverized coal borne air flow of burner is forced to be separated into thick coal culm air-flow and thin powdered coal air-flow, make burner nozzle place formed radially from inside to outside by dense to light coal powder density distribution, Secondary Air classification infeed and coal dust mixed combustion, add the cyclonic action of Secondary Air, toroidal recirculation pattern is formed between thick coal culm air-flow and breeze airflow, the high-temperature flue gas entrainmented is utilized to realize catching fire of coal dust, burning.
As shown in Figure 3: in the downstream of coal burner outlet 31, be radially respectively thick coal culm air-flow 34, toroidal recirculation pattern 32, thin powdered coal air-flow 33 and Secondary Air air-flow 35 from burner axis 30; Breeze airflow concentrates near burner axis 30, presents the CONCENTRATION DISTRIBUTION state that surrounding is light, center is dense; Thick coal culm air-flow 34 periphery and the interior edge of thin powdered coal air-flow 33 are the toroidal recirculation pattern 32 with certain negative pressure; Toroidal recirculation pattern 32 entrainments the high-temperature flue gas come and directly contacts with thin powdered coal air-flow 33 with thick coal culm air-flow 34 in burner hearth, and both are heated to more than ignition temperature, and initial burning, burning, entering burning-out zone 36 burning also after-flame.Meanwhile, before entering burning-out zone 36, this coal burner can make thick coal culm air-flow 34 burn under oxygen debt condition, suppresses the generation of NOx.
At least there is following many technical problems in prior art:
In prior art, the quality of pulverized coal concentrator or separating tube separating property directly affects the air-coal separating effect of coal dust, and then the CONCENTRATION DISTRIBUTION state affecting coal burner is to the rejection of coal dust firing initial stage NOx.
In prior art, the thick coal culm air-flow that formed is separated with separating tube and thin powdered coal air-flow is being penetrated after burner outlet by pulverized coal concentrator, owing to being subject to the impact of mutual air-flow, thick coal culm air-flow and thin powdered coal air-flow are before entering burning-out zone, be easy to again mix, destroy air-coal separating effect, affect the NOx rejection of burner.
In prior art, the thick coal culm air-flow that formed is separated with separating tube and thin powdered coal air-flow is being penetrated after burner outlet by pulverized coal concentrator, thin powdered coal air-flow is due to the characteristic of the impact He self rigidity that are subject to Secondary Air, be easy to mix with Secondary Air, under the volume seat of high-temperature flue gas, again generate NOx, affect the NOx rejection of burner.
In prior art, due to the change of burner pulverized coal conveying characteristic, First air air-flow and Secondary Air air velocity and momentum change thereupon, what the toroidal recirculation pattern that burner outlet is formed and Central backflow area had to a certain degree postponed Secondary Air air-flow and First air air-flow mixes opportunity, make the coal dust firing initial stage define oxygen debt reducing atmosphere condition, suppress the generation of NOx to a certain extent; Meanwhile, the change of burner outlet First air air-flow rigidity, Secondary Air air-flow can not be coated on periphery very well, causes coal dust firing later-stage secondary general mood stream and First air air-flow fully not to mix, generates a large amount of carbon monoxide, affect the after-flame degree of coal dust.
In a word, how to realize the air-coal separating of breeze airflow better, realize the reasonable flow field of burner outlet air-flow, realize catching fire by force and burnout characteristic of burner, thus under the prerequisite not affecting boiler safety, economical operation, suppress the generation of pulverized-coal fired boiler NOx to be the technical barrier that current those skilled in the art face better.
Summary of the invention
The object of the invention is the boiler proposing a kind of coal burner and this coal burner is set, solve in prior art that to there is breeze airflow air-coal separating effect poor, carbon monoxide emission concentration is high, air velocity distribution is chaotic, restriction between carbon monoxide emission, coal dust after-flame and NOx emission and contradiction, cause cannot effective depth suppress NOx generate technical problem.In addition, optimal technical scheme provided by the invention also has the plurality of advantages such as efficiency of combustion is high, coal adaptability is stronger.
For achieving the above object, the invention provides following technical scheme:
Coal burner provided by the invention, flow field, the two-region generating structure comprising central wind-tube, air duct, a secondary air duct and be arranged in an air duct, wherein:
Described Secondary Air jacket casing is located at outside a described air duct;
Described First air jacket casing is located at outside described central wind-tube;
Flow field, described two-region generating structure can make through described two-region flow field generating structure and the coal powder density of the pulverized coal borne air flow sprayed by described air duct is outer dense interior light distributions, and can form the first toroidal recirculation pattern between the higher pulverized coal borne air flow of concentration and the lower pulverized coal borne air flow of concentration, form the second toroidal recirculation pattern between the Secondary Air air-flow sprayed by the gas channel formed between described secondary air duct and a described air duct and the higher pulverized coal borne air flow of described concentration, forms Central backflow area at the downstream area of the lower air-flow of described concentration.
In one preferably or alternatively embodiment, flow field, described two-region generating structure comprises water conservancy diversion air duct, block, guide ring and can adjust the guiding device of breeze airflow rigidity, wherein:
Described water conservancy diversion air duct is between the tract of described central wind-tube and the tract of a described air duct;
Described block is fixedly arranged on the outer wall of described central wind-tube Upstream section, and described guiding device is fixedly arranged on the outer wall of described water conservancy diversion air duct, and the flow port place that goes out of described water conservancy diversion air duct is provided with described guide ring;
The higher pulverized coal borne air flow of described concentration sprays by forming gas channel between the tract of a described air duct and described guide ring;
The pulverized coal borne air flow that described concentration is lower sprays by forming gas channel between described water conservancy diversion air duct and the tract of described central wind-tube.
In one preferably or alternatively embodiment, the cross section of described block is trapezoidal, it comprises first domatic, the end face that is connected successively and second domatic, the described first domatic influent stream port towards a described air duct, the described second domatic influent stream port going out flow port and described water conservancy diversion air duct towards a described air duct.
In one preferably or alternatively embodiment, described block is provided with air vent or ventilation slot, the maximum bearing of trend of described air vent or described ventilation slot and a described air duct to go out flow path direction consistent.
In one preferably or alternatively embodiment, described first domatic different with the described second domatic gradient.
In one preferably or alternatively embodiment, described central wind-tube is the straight tube that in axial direction top external diameter size uniformity, internal diameter size are also homogeneous.
In one preferably or alternatively embodiment, the flow port place that goes out of a described air duct is provided with expansion mouth and/or water conservancy diversion is protruding, and the internal diameter size of described expansion mouth increases gradually along going out flow path direction;
Described water conservancy diversion projection is fixedly arranged on the inwall flow port place of a described air duct, and the end of described water conservancy diversion projection extends towards the direction close to described coal burner axis.
In one preferably or alternatively embodiment, it is trapezoidal positioning table that described water conservancy diversion air duct tract is installed with cross section, described positioning table comprise successively be connected rising domatic, table top is installed and declines domatic, the domatic influent stream port towards a described air duct of described rising, described declivity goes out flow port facing to a described air duct, and described guiding device is fixedly arranged on described installation table top.
In one preferably or alternatively embodiment, described coal burner also comprises outer second air wall and wall body, wherein:
The flow port place that goes out of described secondary air duct is provided with expansion stream portion, and described expansion stream portion increases gradually along going out flow path direction internal diameter size;
Described outer second air wall around and be fixed on the outer wall of described secondary air duct;
Described wall body around described secondary air duct and and there is gap between described secondary air duct, form inner second air gas channel between described secondary air duct and a described air duct;
Outer second air gas channel is formed between described wall body and described outer second air wall, described secondary air duct;
Cyclone is provided with separately in described inner second air gas channel, described outer second air gas channel.
The boiler that the embodiment of the present invention provides, comprises the coal burner that the arbitrary technical scheme of the present invention provides.
Based on technique scheme, the embodiment of the present invention at least can produce following technique effect:
Flow field, two-region provided by the invention generating structure (preferably comprising guide ring), export between dense side breeze airflow and light side breeze airflow at First air and form two toroidal recirculation pattern (also can claim: Crossed Circle recirculating zone) and Central backflow area, postpone the mixing opportunity of dense side breeze airflow and light side breeze airflow thus, realize advanced nitrogen.The change of different ature of coal and air quantity, adopts the different expanded-angle of guide ring and shape.The present invention adopts Crossed Circle recirculating zone, volume seat high-temperature flue gas, form reduction in built-in flame, the mixing opportunity of effective postponement wind at different levels and fuel, the condition suppressing NOx to generate is provided, the shape of different annular recirculation zone is different with the impact of size on NOx intermediate product HCN etc., suppresses NOx ability different.
The present invention proposes the mode that employing two toroidal recirculation pattern and Central backflow area combine, coal dust discharges volatile matter as early as possible, the atmosphere suppressing NOx to generate is provided, utilize Central backflow area to roll up seat high-temperature flue gas simultaneously, realize the after-flame of coal dust, effectively solve the restriction between coal dust after-flame and the control of CO concentration and contradiction.
In sum, special flow field, two-region generating structure (preferably comprising breeze airflow guiding device and guide ring) is adopted in First air generating structure of the present invention, the proposition of novelty also achieves between the inner dense side breeze airflow of primary wind and powder and light side breeze airflow, forms two toroidal recirculation pattern between dense side breeze airflow and inner second air air-flow, and interact with Secondary Air, form the air velocity distribution characteristic of " Central backflow area " in the coal dust firing later stage, achieve the air-flow flow characteristic of " built-in Crossed Circle recirculating zone " and " Central backflow area " two-region;
Built-in " Crossed Circle recirculating zone " increases the contact area of high-temperature flue gas and coal dust, better separates out fugitive constituent ahead of time, creates " reproducibility " atmosphere, and the degree of depth suppresses the generation of NOx;
Adopt the flow field characteristic that built-in " two-region " combines with " Central backflow area ", utilize reduction in flame, reasonably solve Combustion Efficiency of Coal Powder, CO discharge and NOx and suppress triangular contradiction, solving prior art thus, to there is breeze airflow air-coal separating effectiveness comparison poor, causes the technical problem that cannot effectively suppress NOx to generate.
Optimal technical scheme provided by the invention compared with prior art also has at least following advantage:
1, the combination of diverse location between each parts in the inside of an air duct, the pulverized coal preparation system that the continuous change more adapting to power plant soot structure brings is exerted oneself and the change of wind rate.
In the present invention, in First air, guiding device adjusts rigidity or the momentum of breeze airflow, can also adjust in breeze airflow more containing powder, the larger pulverized coal particle of momentum flows along in the near-wall region of cylinder section (or claim: water conservancy diversion air duct), coordinate the flow field characteristic of burner outlet, provide coal dust to catch fire in advance and the condition separating out volatile matter fast.The structure of different guiding devices realizes the central backflow region that First air exports different size and area, coordinates the combustion characteristics of Coal rank.Coal adaptability is stronger, rationally changes burner outlet air velocity distribution, adapts to the fire behaviour of Coal rank and low NOx characteristic.
2, ensureing, under the prerequisite that after-flame degree is higher, to decrease the discharge of CO, inhibit the generation of NOx, reasonably solving the coal dust after-flame degree of burner, CO discharge and NOx and suppress triangular contradiction, achieve advanced nitrogen to a greater extent.
3, more reasonably solve weary gas to mix brought ignition issues with Secondary Air, avoid weary gas to mix with the too early of Secondary Air, reduce the probability of the NOx intermediate products such as HCN and oxygen premature contact, more plus depth suppresses the output of coal dust firing initial stage NOx.
4, the present invention adopts the difference of Secondary Air and First air spout different angles and shape; the coated First air air-flow of Secondary Air air-flow; the near wall region atmosphere of available protecting burner region water-cooling wall; improve coal dust after-flame degree; the growing amount of control CO; solve the high temperature corrosion of water-cooling wall in burner hearth, alleviate or solve the high temperature corrosion because burner hearth air deep-graded brings.
5, coal burner provided by the invention can guarantee that flow parameter proportioning at different levels change is uninfluenced to efficiency of combustion.Can by regulating block, mutual alignment between flared section and water conservancy diversion air duct, mutual resistance between coupling thick coal culm strength passage and thin powdered coal gas channel, to regulate the pulverized coal borne air flow concentration proportioning in two passages in air-flow, with the wind rate of the different air duct of applicable burner and exert oneself on coal dust firing and suppress fuel type NOx characteristic affect atmosphere, there is provided more suitable atmosphere to effectively reduce the generation of NOx, avoid flow parameter proportioning at different levels to change the impact caused efficiency of combustion.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
A kind of Flow Field Distribution figure with the coal burner of toroidal recirculation pattern that Fig. 1 provides for prior art;
A kind of Flow Field Distribution figure with the coal burner of Central backflow area that Fig. 2 provides for prior art;
A kind of Flow Field Distribution figure with the coal burner of toroidal recirculation pattern that Fig. 3 provides for prior art;
The cross-sectional schematic of a kind of coal burner that Fig. 4 provides for the embodiment of the present invention;
The Flow Field Distribution figure of pulverized coal borne air flow of Fig. 5 for spraying in the course of work of coal burner shown in Fig. 4;
Fig. 6 is the cross-sectional schematic of another kind of coal burner provided in this article;
The Flow Field Distribution figure of pulverized coal borne air flow of Fig. 7 for spraying in the course of work of coal burner shown in Fig. 6;
Reference numeral: 10, burner axis; 11, coal burner outlet; 12, toroidal recirculation pattern; 13, Secondary Air air-flow; 14, thin powdered coal air-flow; 15, thick coal culm air-flow; 16, burning-out zone; 20, burner axis; 21, coal burner outlet; 22, thick coal culm air-flow; 23, thin powdered coal air-flow; 24, Central backflow area; 25, Secondary Air air-flow; 26, burning-out zone; 30, burner axis; 31, coal burner outlet; 32, toroidal recirculation pattern; 33, thin powdered coal air-flow; 34, thick coal culm air-flow; 35, Secondary Air air-flow; 36, burning-out zone; 41, coal burner axis; 42, an air duct; 421, block; 211, first is domatic; 212, second is domatic; 213, end face; 422, flared section; 423, the section of extending out; 424, guiding device; 425, water conservancy diversion air duct; 426, spout section; 427, reducing section; 428, water conservancy diversion is protruding; 43, inner second air cylinder; 431, cyclone; 432, expansion mouth; 44, outer air duct; 45, outer second air pipe; 450, outer second air wall; 451, cyclone; 452, stream portion is expanded; 46, central wind-tube; 461, the first flat segments; 462, the second flat segments; 47, wall body; 471, arch mouth; 51, coal burner axis; 52, an air duct; 521, block; 522, water conservancy diversion air duct; 520, positioning table; 523, cylinder section; 524, guiding device; 525, guide ring; 526, expansion mouth; 527, water conservancy diversion is protruding; 53, secondary air duct; 531, cyclone; 551, cyclone; 54, outer air duct; 55, outer second air cylinder; 552, stream portion is expanded; 553, outer second air wall; 554, wall body; 56, central wind-tube; 61, an air duct axis; 62, Central backflow area; 63, toroidal recirculation pattern; 64, the pulverized coal borne air flow that concentration is higher; 65, the pulverized coal borne air flow that concentration is lower; 66, Secondary Air air-flow; 70, an air duct axis; 71, Central backflow area; 72, the first toroidal recirculation pattern; 73, the pulverized coal borne air flow that concentration is lower; 74, the second toroidal recirculation pattern; 75, the pulverized coal borne air flow that concentration is higher; 76, Secondary Air air-flow.
Detailed description of the invention
Content of the present invention and the distinctive points between the present invention and prior art can be understood below with reference to accompanying drawing Fig. 1 ~ Fig. 7 and word content.Hereafter by accompanying drawing and the mode enumerating embodiment more of the present invention, technical scheme of the present invention (comprising optimal technical scheme) is described in further detail.It should be noted that: any technical characteristic in the present embodiment, any technical scheme is all one or more in the technical characteristic of plurality of optional or optional technical scheme, cannot exhaustive all alternative technical characteristics of the present invention and alternative technical scheme in order to describe succinct to need in presents, also the embodiment being not easy to each technical characteristic all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: arbitrary technological means provided by the invention can be carried out replacing or two or more technological means or technical characteristic arbitrarily provided by the invention being carried out mutually combining and obtain new technical scheme.Any technical characteristic in the present embodiment and any technical scheme all do not limit the scope of the invention, protection scope of the present invention should comprise those skilled in the art do not pay creative work thinkable any alternate embodiments and those skilled in the art new technical scheme that two or more technological means or technical characteristic arbitrarily provided by the invention are carried out mutually combining and obtain.
Embodiments provide a kind of breeze airflow air-coal separating effectiveness comparison good, rationally effectively solve the restriction between coal dust after-flame degree, carbon monoxide emission concentration and NOx emission characteristic and contradiction, the coal burner that can effectively suppress NOx to generate and the boiler that this coal burner is set.
Below in conjunction with the elaboration that Fig. 4 ~ Fig. 7 carries out specifically to technical scheme provided by the invention.
Embodiment 1:
As shown in Figure 4 and Figure 5, the coal burner that the embodiment of the present invention provides, comprise central wind-tube 56, air duct 52, secondary air duct (Figure 6 shows that inner second air cylinder) 53 and be arranged on flow field, the two-region generating structure (preferred embodiment hereafter describing in detail of this structure) in an air duct 52, wherein:
Secondary air duct 53 is sheathed on outside an air duct 52.
One time air duct 52 is sheathed on outside central wind-tube 56.
Flow field, two-region generating structure can make through flow field, two-region generating structure and the coal powder density of the pulverized coal borne air flow sprayed by air duct 52 is outer dense interior light distributions, and can form the first toroidal recirculation pattern 72 between the higher pulverized coal borne air flow 75 of concentration and the lower pulverized coal borne air flow 73 of concentration, form the second toroidal recirculation pattern 74 between the Secondary Air air-flow 76 sprayed by the gas channel formed between secondary air duct 53 and an air duct 52 and the higher pulverized coal borne air flow 75 of concentration, forms Central backflow area 71 at the downstream area of the lower air-flow 73 of concentration.
First toroidal recirculation pattern 72, second toroidal recirculation pattern 74 and Central backflow area 71 can postpone the mixing opportunity of the lower pulverized coal borne air flow 73 of dense side breeze airflow and the higher pulverized coal borne air flow 75 of concentration and light side breeze airflow and concentration, realize advanced nitrogen.Relative position between the part of change flow field, two-region generating structure can make the present invention adapt to the change of different ature of coal and air quantity.
As one preferably or alternatively embodiment, flow field, two-region generating structure comprises water conservancy diversion air duct 522, block 521, guide ring 525 and can adjust the guiding device 524 of breeze airflow rigidity, wherein:
Water conservancy diversion air duct 522 is between the tract of central wind-tube 56 and the tract of an air duct 52.
Block 521 is fixedly arranged on the outer wall of central wind-tube 56 Upstream section, and guiding device 524 is fixedly arranged on the outer wall of water conservancy diversion air duct 522, and the flow port place that goes out of water conservancy diversion air duct 522 is provided with guide ring 525.
The higher pulverized coal borne air flow 75 of concentration sprays by forming gas channel between the tract of an air duct 52 and guide ring 525.
The pulverized coal borne air flow 73 that concentration is lower sprays by forming gas channel between water conservancy diversion air duct 522 and the tract of central wind-tube 56.
Arranging of guide ring 525 serves important function to the generation of the first toroidal recirculation pattern 72, second toroidal recirculation pattern 74 and Central backflow area 71.In practical application, according to the change of different ature of coal and air quantity, the guide ring 525 of different expanded-angle and shape can be adopted.
As one preferably or alternatively embodiment, the cross section of block 521 is trapezoidal, it comprises first domatic, the end face that is connected successively and second domatic, the first domatic influent stream port towards an air duct 52, the second domatic influent stream port going out flow port and water conservancy diversion air duct 522 towards an air duct 52.First domatic preferably domatic from second gradient is different.
The concentration of pulverized coal borne air flow domaticly can increase with end face by first, can import the gas channel that be formed between water conservancy diversion air duct and an air duct by pulverized coal borne air flow higher for concentration.
As one preferably or alternatively embodiment, block 521 is provided with air vent or ventilation slot, the maximum bearing of trend of air vent or ventilation slot and an air duct to go out flow path direction consistent.Air vent or ventilation slot the resistance that can reduce block 521 pairs of pulverized coal borne air flows and apply is set.
As one preferably or alternatively embodiment, central wind-tube 56 is the straight tube that in axial direction top external diameter size uniformity, internal diameter size are also homogeneous.The resistance that this structure applies pulverized coal borne air flow is little, and is convenient to manufacture and install.
As one preferably or alternatively embodiment, the flow port place that goes out of an air duct 52 is provided with expansion mouth 526 and/or water conservancy diversion projection 527, and the internal diameter size of expansion mouth 526 increases gradually along going out flow path direction.
Water conservancy diversion projection 527 is fixedly arranged on the inwall flow port place of an air duct 52, and the end of water conservancy diversion projection 527 extends towards the direction close to coal burner axis 51.
Angle between expansion mouth 526 and coal burner axis 51 is 5 ° ~ 60 °.As one preferably or alternatively embodiment, it is trapezoidal positioning table 520 that water conservancy diversion air duct 522 tract is installed with cross section, positioning table 520 comprise successively be connected rising domatic, table top is installed and declines domatic, rise the domatic influent stream port towards an air duct 52, declivity goes out flow port facing to an air duct 52, and guiding device 524 is fixedly arranged on to be installed on table top.
Positioning table 520 is for installing guiding device 524, and rising domaticly domaticly can have guide effect to pulverized coal borne air flow with decline, can increase the powder containing quantity of near wall region air-flow.
As one preferably or alternatively embodiment, coal burner also comprises secondary air duct 53 outer second air wall 553 and wall body 554, wherein:
The flow port place that goes out of secondary air duct 53 is provided with expansion stream portion 552, expands stream portion 552 and increases gradually along going out flow path direction internal diameter size.
Outer second air wall 553 around and be fixed on the outer wall of secondary air duct 53.
Wall body 554 around secondary air duct 53 and and there is gap between secondary air duct 53, form inner second air gas channel between secondary air duct 53 and an air duct 52.
Outer second air gas channel is formed between wall body 554 and outer second air wall 553, secondary air duct 53.
Cyclone (comprising the cyclone 531, the interior cyclone 551 arranged of outer second air gas channel that arrange in inner second air gas channel) is provided with separately in inner second air gas channel, outer second air gas channel.
Secondary air channel, outer second air passage can spray multiply Secondary Air air-flow 76.
It is peripheral that multiply Secondary Air air-flow 76 is positioned at the second toroidal recirculation pattern 74, contributes to the after-flame of coal dust.
Therefore: embodiment of the present invention 1 proposes the mode adopting Crossed Circle recirculating zone and Central backflow area to combine, coal dust discharges volatile matter as early as possible, the atmosphere suppressing NOx to generate is provided, utilize Central backflow area to roll up seat high-temperature flue gas simultaneously, realize the after-flame of coal dust, effectively solve the hair tripe between coal dust after-flame and the control of CO concentration.
Embodiment of the present invention 1 adopts the difference of Secondary Air and First air spout different angles and shape; the coated First air air-flow of Secondary Air air-flow; the near wall region atmosphere of available protecting burner region water-cooling wall; improve coal dust after-flame degree; the growing amount of control CO, solves the high temperature corrosion of water-cooling wall in burner hearth.As seen from the above:
The main distinction point of the present invention and prior art is:
1, adopt the structure of the equal stream unit of shrinkage cavity (band air vent) and deep or light separation sleeve, under the prerequisite not increasing airflow resistance, burner nozzle realizes outer dense interior light coal dust distribution;
2, the structure that First air spout surely fires ring adapts from outer dense interior light different coal dust distributions, to meet under different coal dust distribution reasonably air velocity distribution characteristic, realizes fire behaviour in various degree and low NOx characteristic;
3, adopt special breeze airflow guiding device in First air part, realize the weak of First air air-flow and revolve characteristic, the air-flow flow characteristic proposed at primary wind and powder inside realization " built-in toroidal recirculation pattern " and " Central backflow area " two-region of novelty;
4, adopt built-in " two-region " flow field characteristic, utilize reduction in flame, reasonably solve Combustion Efficiency of Coal Powder, CO discharge and NOx and suppress triangular contradiction;
5, realize, on the basis of " two-region ", proposing the recirculating zone shape between First air and Secondary Air in primary wind and powder inside, the reasonable chance that the intermediate products such as the HCN produced under meeting Coal rank and oxygen amount completely cut off;
6, the equal stream unit of shrinkage cavity, air-coal separating cylinder diverse location between the two or combination, adapt to the change of different coal-fired structure.
Embodiment 2:
As shown in Fig. 6 ~ Fig. 7, the coal burner that this paper embodiment 2 provides, comprise central wind-tube 46, air duct 42, water conservancy diversion air duct 425, a block 421 and can adjust the rigidity of breeze airflow or the guiding device 424 of momentum, coal burner also comprises spout section 426, wherein:
One time air duct 42 is sheathed on outside central wind-tube 46.
Water conservancy diversion air duct 425 is between the tract of central wind-tube 46 and the tract of an air duct 42.
Block 421 is fixedly arranged on the inwall of air duct 42 Upstream section, guiding device 424 is fixedly arranged on the outer wall of central wind-tube 46, and guiding device 424 is positioned within water conservancy diversion air duct 425, the flow port place that goes out of water conservancy diversion air duct 425 is provided with spout section 426, and spout section 426 increases gradually along the flow path direction internal diameter size that goes out of water conservancy diversion air duct 425.
Block 421, under the acting in conjunction of guiding device 424 and water conservancy diversion air duct 425, outer light interior dense distribution is defined at the First air outlet i.e. flow port that goes out of an air duct 42 from the First air of air duct 42 outflow, achieve the air-coal separating of coal powder density, under the guide effect of spout section 426, spacing between deep or light two strands of pulverized coal borne air flows is widened, which thereby enhance the effect of the air-coal separating of coal powder density, simultaneously, annular return region is formed between dense side breeze airflow and light side breeze airflow, volume seat high temperature gases recirculating heats dense side breeze airflow and light side breeze airflow, coal dust volatile matter is separated out as early as possible, produce the intermediate products such as a large amount of HCN, the condition suppressing NOx to generate is provided.And light side breeze airflow is low containing powder concentration, air content is comparatively large, realizes fuel and air classification, and postpone mixing opportunity, the degree of depth suppresses NOx to generate.
As one preferably or alternatively embodiment, the cross section of block 421 is trapezoidal, it comprises first domatic 211, the end face 213 that is connected successively and second domatic 212, first domatic 211 towards the influent stream port of an air duct 42, and second domatic 212 goes out flow port towards an air duct 42.Second domatic 212 of block 421 is preferably towards the influent stream port of water conservancy diversion air duct 425.
The concentration of pulverized coal borne air flow can increase with end face 213 by first domatic 211, pulverized coal borne air flow lower for concentration can be imported the gas channel formed between water conservancy diversion air duct 425 and an air duct 42.
As one preferably or alternatively embodiment, block 421 is provided with air vent or ventilation slot, the maximum bearing of trend of air vent or ventilation slot is with to go out flow path direction consistent.
Air vent or ventilation slot the resistance that can reduce block 421 pairs of pulverized coal borne air flows and apply is set.
As one preferably or alternatively embodiment, central wind-tube 46 comprises the first flat segments 461, flared section 422, second flat segments 462, the section of extending out 423, the 3rd flat segments and the reducing section 427 that are connected successively in axial direction, wherein:
First flat segments 461, second flat segments 462 and the 3rd flat segments separately outside dimension are everywhere consistent.
The flow path direction that goes out of the respective outside dimension of flared section 422, the section of extending out 423 centrally air duct 46 increases gradually.
The flow path direction that goes out of the outside dimension of reducing section 427 centrally air duct 46 reduces gradually.
Guiding device 424 is fixedly arranged in the 3rd flat segments, and there is gap between the inwall of guiding device 424 and water conservancy diversion air duct 425.
Flared section 422, the section of extending out 423 and guiding device 424 all can increase the concentration of the pulverized coal borne air flow close to central wind-tube 46 outer wall, and the pulverized coal borne air flow making concentration higher is entering the flowing of wall region.
As one preferably or alternatively embodiment, the flow port place that goes out of an air duct 42 is provided with expansion mouth 432, the internal diameter size of expansion mouth 432 increases gradually along going out flow path direction, and the angle between expansion mouth 432 and coal burner axis 41 is greater than the angle between spout section 426 and coal burner axis 41.
Expansion mouth 432 is with under spout section 426 acting in conjunction, the spacing between deep or light two strands of pulverized coal borne air flows can be widened, make air-coal separating effect even more ideal, the annular return region that First air exports different size and area and shape can be realized, meet the precipitation rate of Coal rank fugitive constituent and deal to the affecting laws of NOx and NOx intermediate product HCN etc., the atmosphere reasonably suppressing NOx to generate is provided, and considers combustion characteristics and the Slagging Characteristics of different ature of coal.
As one preferably or alternatively embodiment, angle between expansion mouth 432 and coal burner axis 41 is 5 ° ~ 60 ° (being preferably 5 ~ 30 °), and the angle between expansion mouth 432 and coal burner axis 41 and the difference between the two of the angle between spout section 426 and coal burner axis 41 are 5 ° ~ 15 ° (being preferably 10 °).
Said structure is not only convenient to manufacture, install, and spacing between deep or light two strands of pulverized coal borne air flows is comparatively large, and air-coal separating effect is even more ideal.
As one preferably or alternatively embodiment, coal burner also comprises inner second air cylinder 43, outer second air wall 450 and wall body 47, wherein:
Inner second air cylinder 43 is sheathed on outside an air duct 42, and the flow port place that goes out of inner second air cylinder 43 is provided with expansion stream portion 452, expands stream portion 452 and increases gradually along going out flow path direction internal diameter size.
Outer second air wall 450 around and be fixed on the outer wall of inner second air cylinder 43.
Wall body 47 around inner second air cylinder 43 and and there is gap between inner second air cylinder 43, form inner second air passage between inner second air cylinder 43 and an air duct 42.
Outer second air passage is formed between wall body 47 and outer second air wall 450, inner second air cylinder 43.
Cyclone is provided with separately in inner second air passage, outer second air passage.
In one preferably or alternatively embodiment, expand stream portion 452 and parallel with the bearing of trend of expansion mouth 432.
Twice wind that said structure is formed can realize the second-time burning of burner air, improves the efficiency of combustion of burner.
The hereafter preferred embodiment of detailed embodiments 2 and acquired technique effect thereof:
Burner comprises central wind-tube 46, air duct (First air can be flowed out by this air duct) 42, inner second air cylinder 43, outer second air cylinder 45, article one, pulverized coal conveying pipeline (not illustrating in the drawings) is swum coupled on the burner, for this burner supply contains the air-flow of coal dust, one time air duct 42 comprises block 421, flared section 422, the section of extending out 423, guiding device 424, water conservancy diversion air duct 425, reducing section 427 and spout section 426.Sprayed in passage that to be the pulverized coal channel air-flow that contains 1.5 ~ 2 times of powder concentration containing powder concentration formed from water conservancy diversion air duct 425 and the section of extending out 423 by the combination of said structure in an air duct 42, be that the air-flow that pulverized coal channel contains 0.2 ~ 0.25 times of powder concentration sprays in the passage between water conservancy diversion air duct 425 and expansion mouth 432 containing powder concentration, the outer light interior dense CONCENTRATION DISTRIBUTION state of interruption-forming is gone out at an air duct 42, realize the air-coal separating of coal powder density, the condition that burner outlet catches fire in advance is provided, provides burner outlet to suppress the condition of fuel type NOx simultaneously.Block 421, mutual mobile between flared section 422 and water conservancy diversion air duct 425 form different positions, the mutual resistance between thick coal culm strength passage and thin powdered coal gas channel can be mated, regulate the pulverized coal borne air flow concentration proportioning in two passages in air-flow, with the wind rate of the different air duct 42 of applicable burner and exert oneself on coal dust firing and suppress fuel type NOx characteristic affect atmosphere, provide more suitable atmosphere more effectively to reduce the generation of NOx.
In embodiment 2, block 421 can adopt different entrance expanded-angle and export expansion angle, realizes the guide effect of breeze airflow, makes breeze airflow on rational resistance basis, and adjustment enters thick coal culm gas channel and thin powdered coal gas channel.Offer through hole in block 421, the through hole of different position, the aperture of different size and different axially bored line reduce air duct 42 channel resistance further simultaneously, improve the thickening efficiency of pulverized coal borne air flow.
In embodiment 2, the different expanded-angles of the section of extending out 423 and water conservancy diversion air duct 425 various combination position, the section of extending out 423 can adjust air-coal separating in thick coal culm gas channel further, thick coal culm air-flow rigidity or momentum, realize toroidal recirculation pattern and the Central backflow area of rational burner outlet, provide new coal dust to catch fire in advance and suppress condition and the atmosphere of fuel type NOx.Air-flow rigidity is strong, and air-flow is skewing transformations not easily; Air-flow rigidity weakens, and airflow stability is deteriorated.
In embodiment 2, in an air duct 42, guiding device 424 adjusts rigidity or the momentum of breeze airflow, can also adjust in breeze airflow more containing powder, the pulverized coal particle that momentum is larger flows along in the near-wall region of water conservancy diversion air duct 425, coordinate the flow field characteristic of burner outlet, provide coal dust to catch fire in advance and the condition separating out volatile matter fast.The structure of the guiding device (guiding device is preferably camber blades) 424 of different angles, adjust gas-flow rotation characteristics and the rigidity of First air, coordinate from Secondary Air air-flow the central backflow region realizing different size and area air duct 42 outlet, coordinate the combustion characteristics of Coal rank, rationally solve Combustion Efficiency of Coal Powder and suppress the contradiction between NOx generation.
In embodiment 2, spout section 426 forms the structure of certain expanded-angle, and flaring angle can change between 0 ~ 30 degree, but is less than the angle that Secondary Air expands stream portion 452, and angle difference is more than 10 degree.The expanded-angle that the differing heights of spout section 426, length and spout section 426 are different, realize the annular return region that air duct 42 exports different size and area and shape, meet the precipitation rate of Coal rank fugitive constituent and deal to the affecting laws of NOx and NOx intermediate product HCN etc., the atmosphere reasonably suppressing NOx to generate is provided, and considers combustion characteristics and the Slagging Characteristics of different ature of coal.
In embodiment 2, an air duct 42 is by block 421, the structures such as water conservancy diversion air duct 425 and flared section 422 are divided into dense, light two strands of pulverized coal borne air flows, the coal powder density of dense side pulverized coal borne air flow is higher, for 1.5 ~ 2 times of pulverized coal channel air-flow coal powder density, the coal powder density of light side pulverized coal borne air flow is lower, for 0.2 ~ 0.25 times of pulverized coal channel air-flow coal powder density, light side breeze airflow is by spout section 426, separate with dense side breeze airflow and spray into burner hearth, in air duct 42 spout outlet place one segment distance, about 500 ~ 1200mm, annular return region is formed between dense side breeze airflow and light side breeze airflow, volume seat high temperature gases recirculating heats dense side breeze airflow and light side breeze airflow, coal dust volatile matter is separated out as early as possible, produce the intermediate products such as a large amount of HCN, the condition suppressing NOx to generate is provided.Meanwhile, light side breeze airflow is low containing powder concentration, and air content is comparatively large, realizes fuel and air classification, and postpone mixing opportunity, the degree of depth suppresses NOx to generate.
In embodiment 2, by spout section 426, guiding device 424 structure in an air duct 42, form Central backflow area in dense side breeze airflow inside, volume seat high-temperature flue gas is inner to dense side breeze airflow, a large amount of coal dust fugitive constituent is separated out very soon, and generating for suppressing NOx provides reducing atmosphere.Meanwhile, reduce dense side breeze airflow rigidity, strengthen the mixability of coal dust firing later stage and air, improve the after-flame degree of coal dust.
In embodiment 2, secondary air separating is inner second air cylinder 43 and outer second air cylinder 45, realize the fractional combustion of burner air, cyclone 431 and expansion mouth 432 is arranged in inner second air cylinder 43, arrange cyclone 451 in outer second air cylinder 45 and expand stream portion 452, cyclone 431 and cyclone 451 can select the spin intensity that the different anglecs of rotation is different with length adjustment air draught, flared section 432 and expansion stream portion 452 adopt different expanded-angles and length, expanded-angle changes within the scope of 45 ~ 90 degree, both different expanded-angles combinations, and from different water-cooling wall arch mouth 471 angle combinations, realize the different mixing opportunity of secondary air duct and an air duct 42, the coal dust firing initial stage is provided to suppress the condition of NOx generation.Simultaneously, flared section 432 and the angle combinations expanded between stream portion 452 and an air duct 42 spout section 426 and position grouping, realize the rational air velocity distribution of burner, combine the shape in rational toroidal recirculation pattern and central backflow region, area, the condition of coal dust firing and suppression NOx characteristic is provided.
In embodiment 2, the mode that burner adopts " in built-in flame reduction ", at the flow location form that burner outlet formation toroidal recirculation pattern and Central backflow area combine, the generation of effective suppression CO, provide the condition that the degree of depth suppresses NOx, rationally solve efficiency of combustion, the reduction of CO concentration of emission and the triangular contradiction of suppression of NOx.
As shown in Figure 4 to 7, the hereafter difference of detailed embodiments 2 and embodiment 1 and embodiment 1 technique effect acquired by it:
The burner that embodiment of the present invention 1 provides comprises central wind-tube 56, air duct 52, secondary air duct 53, an outer second air cylinder 55, article one, pulverized coal conveying pipeline (not illustrating in the drawings) is swum coupled on the burner, and one time air duct 52 comprises block 521, water conservancy diversion air duct 522, cylinder section 523, guiding device 524, guide ring 525, expansion mouth 526.
The structure of the coal burner provided with the embodiment 2 mentioned herein unlike: in embodiment of the present invention 1, an air duct 52 is by block 521, the structure of water conservancy diversion air duct 522 and cylinder section 523, First air pulverized coal borne air flow is divided into two parts, the passage formed by water conservancy diversion air duct 522 and cylinder section 523 is entered containing the air-flow that powder concentration is higher, the passage formed by water conservancy diversion air duct 522 and central wind-tube 56 is entered containing the air-flow that powder concentration is lower, First air spout forms outer dense interior light CONCENTRATION DISTRIBUTION state, the structure of expansion mouth 526 is utilized to form annular return region between thick coal culm air-flow and Secondary Air, volume seat high-temperature flue gas, condition coal powder ignition being provided and suppressing NOx to generate.
The structure of the coal burner provided with the embodiment 2 mentioned herein unlike: embodiment of the present invention 1 proposes to adopt Crossed Circle recirculating zone, volume seat high-temperature flue gas, form reduction in built-in flame, the mixing opportunity of effective postponement wind at different levels and fuel, the condition suppressing NOx to generate is provided, the shape of different annular recirculation zone is different with the impact of size on NOx intermediate product HCN etc., suppresses NOx ability different.
The boiler that the embodiment of the present invention provides, comprises the coal burner that the arbitrary technical scheme of the present invention provides.
The coal burner that the arbitrary technical scheme of the present invention provides can produce previously described many technique effects, is suitable for the combustibility improving coal burner, and reduces the growing amount of NOx in boiler use procedure.
Arbitrary technical scheme disclosed in the invention described above unless otherwise stated, if the number range of it discloses, so disclosed number range is preferred number range, anyly it should be appreciated by those skilled in the art: preferred number range is only the numerical value that in many enforceable numerical value, technique effect is obvious or representative.Because numerical value is more, cannot be exhaustive, so the present invention just discloses component values to illustrate technical scheme of the present invention, and the above-mentioned numerical value enumerated should not form the restriction to the invention protection domain.
If employ the word such as " first ", " second " herein to limit parts, those skilled in the art should know: the use of " first ", " second " is only used to be convenient to describe carry out difference as not having outside Stated otherwise to parts, the implication that above-mentioned word is not special.
Simultaneously, if the invention described above discloses or relate to parts or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can releasably be fixedly connected with (such as using bolt or screw to connect), also can be understood as: to be non-removablely fixedly connected with (such as rivet, weld), certainly, connection fastened to each other also can be replaced by integral type structure (such as use casting technique is integrally formed create) (obviously cannot adopt except integrally formed technique).
In addition, apply in arbitrary technical scheme disclosed in the invention described above for represent position relationship or shape term unless otherwise stated its implication comprise approximate with it, similar or close state or shape.Arbitrary parts provided by the invention both can be assembled by multiple independent part, and also can be one of the forming manufacture technics separate part out.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (10)
1. a coal burner, is characterized in that, flow field, the two-region generating structure that described coal burner comprises central wind-tube, air duct, a secondary air duct and is arranged in an air duct, wherein:
Described Secondary Air jacket casing is located at outside a described air duct;
Described First air jacket casing is located at outside described central wind-tube;
Flow field, described two-region generating structure can make through described two-region flow field generating structure and the coal powder density of the pulverized coal borne air flow sprayed by described air duct is outer dense interior light distributions, and can form the first toroidal recirculation pattern between the higher pulverized coal borne air flow of concentration and the lower pulverized coal borne air flow of concentration, form the second toroidal recirculation pattern between the Secondary Air air-flow sprayed by the gas channel formed between described secondary air duct and a described air duct and the higher pulverized coal borne air flow of described concentration, forms Central backflow area at the downstream area of the lower air-flow of described concentration.
2. coal burner according to claim 1, is characterized in that, flow field, described two-region generating structure comprises water conservancy diversion air duct, block, guide ring and can adjust the guiding device of breeze airflow rigidity, wherein:
Described water conservancy diversion air duct is between the tract of described central wind-tube and the tract of a described air duct;
Described block is fixedly arranged on the outer wall of described central wind-tube Upstream section, and described guiding device is fixedly arranged on the outer wall of described water conservancy diversion air duct, and the flow port place that goes out of described water conservancy diversion air duct is provided with described guide ring;
The higher pulverized coal borne air flow of described concentration sprays by forming gas channel between the tract of a described air duct and described guide ring;
The pulverized coal borne air flow that described concentration is lower sprays by forming gas channel between described water conservancy diversion air duct and the tract of described central wind-tube.
3. coal burner according to claim 2, it is characterized in that, the cross section of described block is trapezoidal, it comprises first domatic, the end face that is connected successively and second domatic, the described first domatic influent stream port towards a described air duct, the described second domatic influent stream port going out flow port and described water conservancy diversion air duct towards a described air duct.
4. coal burner according to claim 3, is characterized in that, described block is provided with air vent or ventilation slot, the maximum bearing of trend of described air vent or described ventilation slot and a described air duct to go out flow path direction consistent.
5. coal burner according to claim 3, is characterized in that, described first domatic different with the described second domatic gradient.
6. coal burner according to claim 2, is characterized in that, described central wind-tube is the straight tube that in axial direction top external diameter size uniformity, internal diameter size are also homogeneous.
7. coal burner according to claim 6, is characterized in that, the flow port place that goes out of a described air duct is provided with expansion mouth and/or water conservancy diversion projection, and the internal diameter size of described expansion mouth increases gradually along going out flow path direction;
Described water conservancy diversion projection is fixedly arranged on the inwall flow port place of a described air duct, and the end of described water conservancy diversion projection extends towards the direction close to described coal burner axis.
8. coal burner according to claim 2, it is characterized in that, it is trapezoidal positioning table that described water conservancy diversion air duct tract is installed with cross section, described positioning table comprise successively be connected rising domatic, table top is installed and declines domatic, the domatic influent stream port towards a described air duct of described rising, described declivity goes out flow port facing to a described air duct, and described guiding device is fixedly arranged on described installation table top.
9., according to the arbitrary described coal burner of claim 1-8, it is characterized in that, described coal burner also comprises outer second air wall and wall body, wherein:
The flow port place that goes out of described secondary air duct is provided with expansion stream portion, and described expansion stream portion increases gradually along going out flow path direction internal diameter size;
Described outer second air wall around and be fixed on the outer wall of described secondary air duct;
Described wall body around described secondary air duct and and there is gap between described secondary air duct, form inner second air gas channel between described secondary air duct and a described air duct;
Outer second air gas channel is formed between described wall body and described outer second air wall, described secondary air duct;
Cyclone is provided with separately in described inner second air gas channel, described outer second air gas channel.
10. a boiler, is characterized in that, comprises the arbitrary described coal burner of claim 1-9.
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| CN201310518357.4A CN104566357A (en) | 2013-10-29 | 2013-10-29 | Pulverized coal burner and boiler |
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| CN111998336A (en) * | 2020-09-14 | 2020-11-27 | 哈尔滨锅炉厂有限责任公司 | Direct-flow pulverized coal burner with thick outside and thin inside |
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| CN114791106A (en) * | 2022-05-19 | 2022-07-26 | 哈尔滨工业大学 | Cyclone burner with multi-channel primary air |
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| WO2023204103A1 (en) * | 2022-04-22 | 2023-10-26 | 川崎重工業株式会社 | Powder fuel burner |
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