CN1243216A - Coal-powder combustor - Google Patents
Coal-powder combustor Download PDFInfo
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- CN1243216A CN1243216A CN 98116622 CN98116622A CN1243216A CN 1243216 A CN1243216 A CN 1243216A CN 98116622 CN98116622 CN 98116622 CN 98116622 A CN98116622 A CN 98116622A CN 1243216 A CN1243216 A CN 1243216A
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Abstract
The powdered coal burner in powdered coal combustion boiler for steam generation in the electric power plant or other plant is characterized by that the interior of the powered coal-gas mixture nozzle is equipped with a gradation separator, and the front end of the powdered coal-gas mixture nozzle is divided into upper and lower two portions, an the air for promoting combustion is introduced between the nozzle orifices, and the powdered coal-gas mixture nozzle is eccentrically-placed relatively to air nozzle so as to make the powdered coal-gas mixture which is thrown is along the tangential direction of the virtual circle of horizontal plane in the furnace cavity, and burn thickened at the virtual circle centre so that it can make the burner for burning powder coal possess large volume.
Description
Technical field
The present invention relates to be used to generate electricity or the pulverized coal firing boiler of steam generation such as factory.
Prior art
According to Fig. 7 to Figure 10 existing this boiler is described below.
The 01st, the furnace body of boiler, its four jiaos are equipped with a plurality of burner bodies 02 respectively along the vertical direction.Burner body 02 by combustion air nozzle 03, auxiliary constitute with air nozzle 04 and fine coal gaseous mixture nozzle 05 etc., and supply with fine coal gaseous mixture 10, combustion air 11, main burner air 12 and auxiliary air 13 etc. with conduit 08 and auxiliary air with conduit 09 etc. through fine coal mixed gas pipeline 06, the conduit 07 of supplying gas, main burner air.
The 14th, be configured in the auxiliary air nozzle of top position, 15 expression burner hearth inside, formation pulverized coal flame 16 this burner hearth 15 in.The 17th, be assembled into the air conditioning air door on each burner body 02, the 18th, the imaginary circle of hypothesis for convenience of explanation and in upper furnace 16, the 19th, the flame eddy current of formation burner hearth 15 in.
Have the existing pulverized coal fired boiler of above-mentioned parts, the coal powdered that is transported to coal dust broken equipment in abridged among the figure, simultaneously, this fine coal is mixed with air (hot blast) with the conveying of conveying, form fine coal gaseous mixture 10, fine coal gaseous mixture 10 is sent to the fine coal gaseous mixture nozzle 05 that is provided on the burner body 02 by fine coal mixed gas pipeline 06 then.
Each nozzle in all these nozzles, promptly fuel with air nozzle 03, auxiliary all be mounted to the tangential direction injection fine coal gaseous mixture 10 of imaginary circle 18 and the structure of main burner air 12 relatively with air nozzle 04, fine coal gaseous mixture nozzle 05.Above-mentioned imaginary circle 18 is the imaginary circle in the centre of hypothesis on boiler furnace body 01 horizontal section.Figure 10 illustrates an example of the assembly drawing of existing fine coal gaseous mixture nozzle 05.
On boiler furnace body 01, four jiaos are provided with auxiliary air nozzle 14 above burner body 02.This auxiliary air nozzle 14 is mounted to the structure of the tangential direction injection auxiliary air 13 of imaginary circle 18 relatively, here said imaginary circle 18 is the imaginary circle that are set in the centre on the horizontal section of boiler furnace body 01, and with aforementioned each nozzle 03,04,05 of burner body 02 right imaginary circle 18 diameters identical.
The fine coal gaseous mixture 10 that is sent to fine coal gaseous mixture nozzle 05 set on the burner body 02 sprays into burner hearth inside 15 from this nozzle 05.On the other hand, combustion air 11 by conveying equipment not shown in the figures through the conduit 07 of supplying gas supply gas entering burner body 02 before, be split into main burner with air 12 and auxiliary air 13.
Main burner is sent into burner body 02 by the main burner air with conduit 08 with air 12, sprays into burner hearth inside 15 with auxiliary with air nozzle 04 with air nozzle 03 from fuel.
Usually, main burner with the amount of air 12 as the amount opinion of the coal amount that sprays into of fine coal gaseous mixture 10 than following, the burner hearth interior 15 that remains on auxiliary air nozzle 14 belows is reducing atmosphere, makes oxynitrides (hereinafter to be referred as the NOx) reduction that produces by pulverized coal friring.
The auxiliary air of shunting with air 12 with main burner 13 is admitted to auxiliary air nozzle 14, sprays into burner hearth inside 15, for the usefulness that makes the incendivity composition completing combustion that remains in the burning gases by the reduction burning.
From four jiaos of fine coal gaseous mixtures 10 that spray into burner hearth inside 15 of boiler furnace body 01, the incendiary source igniting with not shown in the figures forms pulverized coal flame 16.Pulverized coal flame 16 forms flame eddy current 19 after becoming eddy flow, rises while rotate at burner hearth inner 15, is rotated burning.
As previously mentioned, the main burner that sprays into from burner body 02 is with the amount of air 12, spray into from fine coal mist nozzle 05 as the amount opinion of the coal amount of fine coal gaseous mixture 10 than following, and become the more ambiance of the burner hearth inside 15 of below of auxiliary air nozzle 14 positions.
Therefore, become the gas that contains the incendivity composition, still,, can generate the NH that substitutes this NOx by to reducing by the NOx in the burnt gas that pulverized coal friring produced by the burnt gas that pulverized coal friring produced
3, intermediate product such as HCN.
Is vital in the reduction of the NOx of this reduced zone for high efficiencyly carrying out that main burner mixes and burn with the diffusion of fine coal mist 10 with air 12, can improve the percent reduction of NOx after falling with the oxygen full consumption of air 12 supplies by main burner.
The burnt gas that contains the incendivity composition sprays into auxiliary air 13 at auxiliary air nozzle 14 places, to the burning end of furnace outlet place.
The pulverized coal friring of such prior art, when the diameter of the imaginary circle 18 in centre on the horizontal section that is set in boiler furnace body 01 was too small, pulverized coal flame 16 can clash each other, makes flame eddy current 19 can not form combustion deterioration well.On the contrary, in the excessive occasion of the diameter of imaginary circle 18, the sidewall of pulverized coal flame 16 and burner hearth inside 15 clashes etc., and the phenomenon of combustion deterioration also appears in violent turbulent rising.
Like this, when determining the diameter of imaginary circle 18 according to prior art, also to cautiously consider real result, but, even like this, also can between the sidewall of burner hearth inside 15 and pulverized coal flame 16, produce negative pressure by the main burner that sprays at a high speed with air 12, make pulverized coal flame 16 near sidewall, because so-called wall attachment effect, the flame eddy current 19 that pulverized coal flame 16 is formed each other becomes its diameter hollow and annular flame eddy current 19 also bigger than the diameter of imaginary circle 18, and it is mobile at burner hearth inner 15, therefore acutely turbulent.
When burner capacity became big, it is big that the ejection momentum of the fine coal mist 10 that sprays into from fine coal mist nozzle 05 becomes, the result, and pulverized coal flame 16 is more violent towards the impact of the sidewall of burner hearth inside 15, is difficult to guarantee stable ignitability.Therefore, the burner of existing burning fine coal exists the shortcoming that is difficult to high capacity.
The invention task
In the occasion that requires the boiler high capacity, will inevitably increase quantity combusted, still, corresponding with it, (1) will increase the burner number that is contained on the boiler, and (2) will make burner (each burner) high capacity.
Wherein, owing to the burner number on the horizontal section of boiler furnace body 01 is determined, if increase the burner number, just must increase the progression of burner, yet, if the progression of burner increases, will improve the height of boiler, the result has increased the construction cost of boiler.
Therefore, the boiler high capacity, and do not mean that the high capacity of each burner accordingly, still, because when utilizing burners in prior to carry out can to form the such burning of flame eddy current 19, increase along with burner capacity, it is big that the ejection momentum of the fine coal mist 10 that sprays into from fine coal mist nozzle 05 becomes, the result, and pulverized coal flame 16 strengthens towards the impact of inner 15 sidewalls of burner hearth, increase turbulent amount, be difficult to guarantee the combustion stability of pulverized coal flame 16 simultaneously.
The present invention proposes for the problem of eliminating above-mentioned conventional art, and its objective is provides a kind of powdered coal burner, by adopting: set deep or light chorista in fine coal mist nozzle; The front end of fine coal gaseous mixture nozzle is cut apart up and down, and the promotion of will catching fire imports between the ejiction opening with air; Air nozzle is provided with fine coal gaseous mixture nozzle prejudicially relatively; Make the combustion air rotation; Adjust the measures such as direction of burner leading section, the tangential direction input of the imaginary circle on the horizontal plane in the burner hearth and the fine coal mist of burning are thickened at the central side of imaginary circle, then can make the burner high capacity of burning fine coal.
Another object of the present invention is to attempt on the top of prior art stove the additive air mouth being set, in order to the dispersion air amount, reduce the air capacity of burner wind-box part, reduce the NOx value, can eliminate thereupon and make the defective that the stove whole height increases and expense strengthens, dwindled the burner hearth whole height, reduced burner height, with elimination make that the thermic load of burner portion uprises, slag (fusion ash) adheres to the furnace wall and increases and cause and conduct heat and defectives such as incendiary obstacle, and practicality height, suitable burner portion are provided.Summary of the invention
The present invention provides a kind of powdered coal burner in order to solve above-mentioned problem, the tangential direction of this powdered coal burner imaginary circle on the horizontal plane in the burner hearth drops into the fine coal gaseous mixture and makes it burning, in fine coal gaseous mixture nozzle, be equipped with deep or light chorista, aforementioned fine coal gaseous mixture is thickened at the central side of imaginary circle, the fine coal mist that sprays into from fine coal gaseous mixture nozzle is reduced with the flame eddy current outer circumferential side concentration that central part in burner hearth forms, and the mode that improves in private side concentration sprays into, and make the fuel air that drops into air nozzle from the set for example fuel of fine coal mist nozzle periphery, increase in amount from the fine coal gaseous mixture side input of light concentration, the result, can prevent the impact of pulverized coal flame and inboard wall of burner hearth face, reduce turbulent phenomenon, can make the burner high capacity of burning fine coal.
The present invention also provides the front end mist ejiction opening that is provided with aforementioned fine coal mist nozzle to cut apart up and down, and the powdered coal burner of the device between the ejiction opening that promotes to be cut apart that will catch fire with the air importing, by cutting apart from both direction about the fine coal gaseous mixture edge that fine coal mist nozzle sprays into, the fine coal gaseous mixture scale of construction that sprays into from a direction is reduced by half, and spray into high-temperature fuel between the fine coal mist that sprays into from both direction with air, thus, can improve the combustion stability of pulverized coal flame, make the burner high capacity of burning fine coal.
The present invention also provides a kind of powdered coal burner, the tangential direction of the imaginary circle in the burner hearth on the horizontal plane drops into the fine coal gaseous mixture and makes it burning, so that aforementioned fine coal gaseous mixture is provided with fine coal gaseous mixture nozzle in the mode that the central side of imaginary circle thickens prejudicially with respect to air nozzle, by allowing the axis misalignment of the axis of fine coal mist nozzle and air nozzle and eccentric, make the fine coal concentration step-down that sprays into the fine coal gaseous mixture of formed flame eddy current outer circumferential side in the stove (promptly near the furnace wall face) from fine coal gaseous mixture nozzle, and the fine coal concentration that sprays into flame eddy current private side thickens, thus, can prevent the impact of pulverized coal flame and hearth wall, make towards near the air capacity the inboard wall of burner hearth face and increase, the oxidation surrounding atmosphere, improve ash fusion point, as a result, can prevent adhering to of fusion ash.
The present invention also provides a kind of powdered coal burner, this burner is provided with the device that makes the combustion air rotation of supplying with from the periphery of aforementioned fine coal gaseous mixture nozzle, thus, can make the combustion air rotation, be used in combination the flame holding in the time of to guarantee when burner capacity increases, to improve stability of ignition, load variations, short-flameization and low coal dust as required with for example protecting the flame device.
The present invention also provides a kind of powdered coal burner, this powdered coal burner also is provided with up and down, the device of left and right directions conversion burner leading section, by the structure that adopts up and down, left and right directions changes the nozzle direction, can change the position of flame eddy current, can adjust the distribution of thermic load in the burner hearth.
The present invention also provides a kind of powdered coal burner, comprise: banner broadens and height step-down and make the burner of fuel high heat load burning in narrow zone, be configured in the independent additive air mouth of this burner top, be configured in the micro-powder fuel pipe and the rotating plate that micro-powder fuel is departed to the stove inboard, and the aperture area that makes close furnace wall side becomes greatly and makes the fuel air injection reaction mouth of the air capacity increase of close furnace wall side, thus, banner corresponding to burner broadens, can reduce the height of burner, at narrow zonal combustion fuel and carry out high heat load burning, by above burner, disposing independent additive air mouth, can reduce the generation of NOx, in addition, the rotating plate that utilization is disposed in the micro-powder fuel pipe makes micro-powder fuel deflection stove inboard, simultaneously, utilize the air capacity of the fuel air injection reaction mouth increase of the aperture area that increases close furnace wall side near the furnace wall side, thus, improve the fusing point of slag (fusion ash), can prevent fusion ash the adhering to that causes by aforementioned high heat load to the furnace wall.
Brief description
Fig. 1 shows the steam generator system of first embodiment of the invention, is the key diagram of I-I section among Fig. 2.
Fig. 2 shows the horizontal section of Fig. 1 boiler, is the II-II sectional drawing of Fig. 1.
Fig. 3 shows the brief configuration of the fine coal mist nozzle in Fig. 1, Fig. 2 boiler, and wherein (a) is the key diagram of the a-a section of (b), (b) is the key diagram of the b-b section of (a), (c) is the key diagram of the c-c section of (a).
Fig. 4 is the burner front elevation of invention second embodiment.
Fig. 5 is the longitudinal section of Fig. 4 burner.
Fig. 6 shows the brief configuration of the powdered coal burner of third embodiment of the invention, wherein (a) is the key diagram of expression boiler section, (b) be the schematic diagram that reaches the additive air mouth that disposes separately above it at four jiaos of burner wind-boxs that dispose of (a), (c) being the front elevation of one of the fuel nozzle of (b), (d) is fuel is supplied with in micro-powder fuel pipe key diagram from expression to the fuel nozzle of (c).
Fig. 7 shows existing steam generator system, is the key diagram of Fig. 8 VI-VI section.
Fig. 8 is the VII-VII sectional drawing of Fig. 6 boiler.
Fig. 9 shows the configuration of the burner of existing boiler, and wherein (a) and (b), (c), (d) are respectively various multi-form key diagrams.
Figure 10 shows the fine coal mist nozzle of existing boiler, and wherein (a) is sectional drawing, (b) is (a) B-B sectional drawing.
Embodiment
Below with reference to Fig. 1 to Fig. 3 the 1st embodiment of the present invention is described.And, corresponding with aforementioned prior art, represent with original symbol additional 100 at same position, therefore, can be readily appreciated that by interrelated this paper saves its repeat specification as far as possible.
That is to say that symbol 101～119 is corresponding with the symbol 01～10 of prior art, thereby, its explanation simplified as much as possible.Hereinafter be described in detail and be arranged on that catching fire on the fine coal mist nozzle 105 promotes with airport 120, catching fire promotes with air chamber 121, the promotion usefulness of catching fire air chamber ingate 122, guide plate 123 and deep or light chorista 124 etc.
The coal of sending into coal dust broken equipment in abridged among the figure by the broken equipment fine-powdered of this coal dust after, mix formation fine coal mist 110 with the conveying of sending here simultaneously mutually with air (hot blast), send into fine coal mist nozzle 105 set on the burner body 102 through fine coal mixed gas delivery pipe 106 then.
Fine coal mist nozzle 105 is made up of fine coal mist conduit that links to each other with fine coal mixed gas delivery pipe 106 and the mist nozzle that is contained in this catheter proximal end.Be provided with deep or light chorista 124 near the mist nozzle entrance the fine coal mist conduit.
The ejiction opening of gaseous mixture nozzle can be arbitrarily angled, for example is arranged to respect to the angle of horizontal axis towards 10 °～30 ° of lateral deviations, and both direction difference about the edge, be provided with the promotion air chamber 121 that catches fire up and down between the ejiction opening.
Periphery at the mist nozzle is provided with fuel air nozzle 103, and the main burner of sending here sprays into burner hearth inside 114 from mist nozzle and fuel with the entrance that air nozzle 103 is constituted with air 112.
Send into of deep or light chorista 124 bias currents of the fine coal mist 110 of fine coal gaseous mixture nozzle 105 by fine coal gas mixture conduit exit.As a result, under the effect of fine coal particle inertia force, deep or light chorista 124 1 sides are installed at the gaseous mixture nozzle exit, the fine coal concentration step-down of fine coal gaseous mixture 110, on the contrary, in the opposite side that deep or light chorista 124 is installed, the fine coal concentration of fine coal gaseous mixture 110 thickens.
The ejiction opening of the main burner usefulness air 112 that is formed with air nozzle 103 by gaseous mixture nozzle and fuel is made light fine coal concentration one side of fine coal gaseous mixture 110 is broadened; The structure that dense fine coal concentration one side narrows down.
When the central portion in burner hearth inside 115 forms flame eddy current 119 and carries out rotary combustion, fine coal mist 110 from the ejection of gaseous mixture nozzle, its this side that sprays into to flame eddy current 119 central sides becomes the upstream side of rotary combustion stream, thereby, radiant heat quantitative change from the pulverized coal flame 116 of adjacency is big, is in the state that is easy to catch fire.As a result, fine coal mist 110 is set for the form that dense fine coal concentration one side is sprayed into towards flame eddy current 119 central sides.
As for the main burner that sprays into the ejiction opening of air 112 with air nozzle 103 formed main burners from gaseous mixture nozzle and fuel with air 112, since with main burner with the ejiction opening area of air 112 set for make this main burner with air 112 towards the straying quatity of flame eddy current 119 central sides tail off and towards flame eddy current 119 outsides the form more than the quantitative change of spraying into of (burner hearth wall one side), thereby, can prevent that the pulverized coal flame 116 and the wall of burner hearth inside 115 from clashing, and then suppress the generation of turbulent and unburnt ingredient.
For this consideration, in the present embodiment,, also the mist nozzle has been carried out new design in order to improve the combustion stability of pulverized coal flame 116.
That is to say, as indicated above, the ejiction opening of gaseous mixture nozzle has angle arbitrarily, and both direction difference about the edge, descend thereon between the ejiction opening to be provided with to catch fire and promote, guide plate 123 is set and catches fire at the inlet of this air chamber 121 and promote with air chamber ingate 122 with air chamber 121.
Catching fire promotes to be provided with plate with air chamber 121 in the side in the face of burner hearth inside 115, and being equipped with on this plate catches fire promotes with airport 120.Flow into the main burner air 112 that air chamber 121 is used in the promotion of catching fire by the promotion of catching fire with air chamber ingate 122, quilt sprays between the air-flow of two strands of fine coal gaseous mixtures 110 of mist nozzle ejection.
Promote the main burner spray into airport 120 to have following effect with air 112 from catching fire: the air-flow that can prevent the fine coal gaseous mixture 110 that sprays into from two spouts of gaseous mixture nozzle collaborates in early days; In general, because the temperature of fine coal gaseous mixture 110 is the low temperature of (occasion is about 80 ℃ mostly) below 100 ℃, relative with it, main burner is about 300 ℃ high temperature with the temperature of air 112, thereby can promote the volatile ingredient between fine coal gaseous mixture 110 air-flows to take place in addition, guarantee the combustion stability of pulverized coal flame 116.
Hereinafter narrate the second embodiment of the present invention according to Fig. 4 and Fig. 5.In addition, in this embodiment, there is the burner body of representative to describe, is appreciated that represented burner body is 1 that is got here from each burner assortment of aforementioned first embodiment though only list 1.
The 201st, fine coal mist nozzle is provided with auxiliary air nozzle 202 around it, also be provided with tertiary air nozzle 203.
The 204th, cyclone is configured in the upstream position that aforementioned tertiary air nozzle 203 exports.The 205th, hollow cartridge is arranged on the upstream position that fine coal gaseous mixture nozzle 201 exports.
The 206th, tilting bar is connected with spherical connecting portion 210 of aforementioned each nozzle 201,202,203 leading section, and by side-to-side movement along the direction of arrow in the figure, making each nozzle 201,202,203 is center direction transformation up and down with connecting portion 210.
The tilting bar 206 that is connected with tertiary air nozzle 203 is born the motion of the above-below direction of this tertiary air nozzle 203, auxiliary air nozzle 202 usefulness support bars 207 link to each other with fine coal gaseous mixture nozzle 201, by means of the tilting bar 206 that is connected on this auxiliary air nozzle 202, can make fine coal mist nozzle 201 and auxiliary air nozzle 202 interlock, direction transformations up and down.
Another tilting bar of abridged is connected the roughly position of half-twist of aforementioned dome shape connecting portion 210 among the figure in addition, is appreciated that the leading section direction transformation to the left and right that can make each nozzle 201,202,203 by this tilting bar.In addition, the 208th, protect the flame device, be provided in the front end of each nozzle 201,202,203, the effect of the flame of playing stably.
Therefore, in this embodiment, by means of the hollow cartridge 205 in the fine coal mist nozzle 201, can make in the fine coal mist injection stream the fine coal CONCENTRATION DISTRIBUTION around a side thicken, and strengthen combustion stabilities by protecting flame device 208.
In addition, by seesawing of tilting bar 206, the injection stream direction that can make fine coal mist, auxiliary air, tertiary air along about, left and right directions changes.And fine coal mist and auxiliary air can spray in the same direction by the fixedly interlock on support bar 107.
Hereinafter narrate the third embodiment of the present invention with reference to Fig. 6.In addition, this Fig. 6 (a) shows the section of boiler, (b) show four jiaos burner wind-box and the configuration independent additive air mouth above it that is configured in (a), (c) show the Facad structure of one of the fuel nozzle of (b), (d) show micro-powder fuel pipe from fuel to the fuel nozzle of (c) that supply with.
In Fig. 6 (a), the 301st, furnace profile, it is surrounded square on every side by the furnace wall, be equipped with burner wind-box 302 respectively at Qi Sijiao.The 303rd, flame, the 304th, what represent is the furnace wall near zone.
Fig. 6 (b) shows in detail previous combustion device bellows 302, and shows the structure that Pyatyi constitutes.That is to say, be equipped with the 305b of auxiliary air portion, 305a at upper and lower side, configuration first 306a of fuel nozzle portion disposes the second level 306b of fuel nozzle portion by the 307a of oil burner nozzle portion on this first fuel nozzle 306a of portion on the lower end auxiliary air 305a of portion; Similarly, by the 307b of the oil burner nozzle portion configuration third level fuel nozzle 306c of portion; By the 307c of the oil burner nozzle portion configuration fourth stage fuel nozzle 306d of portion; By by the 307d of the oil burner nozzle portion configuration level V fuel nozzle 306e of portion,, between each parts, all sequentially dispose again, constitute good stepped construction in gapless mode up to upper end auxiliary air portion 305b place.
So, from this duplexer, be conceived to the level V fuel nozzle 306e of portion, Fig. 6 (c) shows its front shape, this level V fuel nozzle 306e of portion by be configured in central authorities be used to spray micro-powder fuel and constitute with carrying with the fuel ejiction opening 308 of air and surround the fuel auxiliary air ejiction opening 309 that this fuel ejiction opening 308 being used on every side spray auxiliary air.
Certainly, the 306a～306d of other fuel nozzle portions has the same structure with the aforementioned level V fuel nozzle 306e of portion.In addition, the micro-powder fuel from aforementioned fuel ejiction opening 308 ejections is to deliver to this fuel ejiction opening 308 through the micro-powder fuel pipe 310 shown in Fig. 6 (d) with carrying with air.
In addition, up to the present, though narrated basic structure,, present embodiment can also be to carrying out various additional designs by the understanding of the structure that Fig. 6 put down in writing.That is to say, though surrounding square furnace profile 301 by the furnace wall on every side is to be equipped with burner wind-box 302 respectively at Qi Sijiao, but, the first order as the burner waist～level V fuel nozzle 306a～306e of portion that disposes and the 307a～307d of oil burner nozzle portion that disposes can also be made the banner broad and highly lower structure here between each spray nozzle part.
For example, existing general its banner of fuel nozzle portion is 1～1.5 times of height, and about 3 times shape that banner is a height is made by the fuel nozzle portion of present embodiment, widens and the corresponding structure that highly reduces by adopting such banner that allows, and can dwindle the stacked overall height dimension of Pyatyi.
In addition, constitute the stacked burner wind-box 302 of this Pyatyi above, be provided with additive air mouth 314, the position that is provided with of this additive air mouth 314 is in and the position that is configured to sustained height of the additive air mouth of fuel nozzle portion topmost in the past.
Moreover, in this duplexer, draw the level V fuel nozzle 306e of portion that hatching is arranged, its front shape is shown in Fig. 6 (c), spray micro-powder fuel and constitute with carrying with the fuel ejiction opening 308 of air and be centered around the fuel auxiliary air ejiction opening 309 that this fuel ejiction opening 308 being used on every side spray auxiliary air by being configured in inboard being used to, but, as can be seen from the figure, Nei Ce fuel ejiction opening 308 is configured in the fuel auxiliary air ejiction opening 309 of this fuel ejiction opening 308 amesialityly.
In other words, adopt such structure, the peristome of the fuel auxiliary air ejiction opening 309 of close furnace wall is broadened, and narrow down near this part centre, air area near the furnace wall becomes big, and the spray volume of fuel auxiliary air is more more near the furnace wall, compares with the flame 303 of close central authorities, near the place, furnace wall, in furnace wall near zone 304, form thin fuel flame 311.
In addition, in the inside that is used for micro-powder fuel and conveying are supplied with air the micro-powder fuel pipe 310 of aforementioned fuel ejiction opening 308, make aforementioned micro-powder fuel be equipped with projection 313 with carrying inboard with the crooked position of air stream, this projection 313 make aforementioned micro-powder fuel etc. under action of centrifugal force towards above, the outside departs from, rotating plate 312 by configuration in the back flows half-twist to this micro-powder fuel, micro-powder fuel is being uprised near the inboard concentration of stove, and reduce near near the concentration furnace wall.
Present embodiment is owing to there is above-mentioned formation, with first～level V fuel nozzle 306a～306e of portion is the center, the width of so-called burner portion is broadened, and make its height step-down, thus, micro mist shape fuel stream has increased the heating surface area by Fire Radiation, has promoted to catch fire, in narrow zone, burn simultaneously, improved surrounding atmosphere temperature, strengthened flammability.
In addition, be provided with the additive air mouth 314 that separates with burner portion at the height and position suitable with the higher level of existing general burner, can the air input of about 30～40% q.s of whole combustion airs will be equivalent to, making previous combustion device portion is the reduced zone of lack of air, simultaneously, reduction by burner portion whole height, can guarantee the holdup time of micro-powder fuel from burner portion to additive air mouth 314 and burning gases etc., factors such as the raising surrounding atmosphere temperature of catching fire with promotion combine, and can also present the effect of further reinforcement Nox reduced zone.
In addition, by the rotating plate 312 and projection 313 that is provided in micro-powder fuel pipe 310 inside, at first, producing under the centrifugal action with 310 bendings of micro-powder fuel pipe, micro-powder fuel is departed from, then in the section of micro-powder fuel pipe 310 through projection 313, make the micro-powder fuel rotation and the inboard ejection of close stove in dense zone by rotating plate 312, thus, reduce near the micro mist amount in furnace wall, also reduced ash amount.
Further, the occasion that in ash content, contains ferrous components, around under the state of atmosphere lack of air, form the low compound of melt temperature, increased adhesive force, thereby increased the air capacity of the furnace wall side of making wide aperture area, and make air become sufficient atmosphere, can prevent the formation of this compound.
Above narrated the present invention with illustrated embodiment, still, the present invention is not limited to these embodiment, can also make the change of various concrete structures within the scope of the invention.
The invention effect
According to above the present invention, by in the fine coal mixture gas nozzle, setting deep or light chorista, can The fine coal concentration that sprays into towards flame eddy current central side in the fine coal gaseous mixture that sprays in the burner hearth is thickened, and The fine coal concentration step-down that enters of side spray thus, can prevent rushing of pulverized coal flame and inboard wall of burner hearth face outwardly Hit, reduce turbulent phenomenon, make the burner high capacity of burning fine coal.
According to the invention of claim 2, arrange between the ejiction opening up and down by fine coal mixture gas nozzle front end Catch fire and promote the promotion of catching fire with air chamber to use airport, a part of high temperature main burner air Spray between the fine coal gaseous mixture injection stream of up and down ejiction opening ejection, thus, can prevent up and down fine coal The gaseous mixture injection stream is collaborated in early days, and promotes the generation of volatile ingredient, makes stablizing of pulverized coal flame The fire burning becomes possibility, makes the burner high capacity of burning fine coal.
According to the invention of claim 3, by allowing the axis of fine coal mist nozzle and air nozzle Axis misalignment is also eccentric, makes from the fine coal mixture gas nozzle and sprays into formed flame eddy current outer circumferential side in the stove The fine coal concentration step-down of the fine coal gaseous mixture of (namely near the furnace wall face), and spray into flame eddy current private side Fine coal concentration thicken, thus, can prevent the impact of pulverized coal flame and hearth wall, make in burner hearth Near the wall air capacity increases, and becomes oxidizing atmosphere, improves ash fusion point, and the result can prevent melting Adhering to of ash.
According to the invention of claim 4, owing to be provided with the device of combustion air rotation, by ejection Rotational flow air, in the occasion of burner high capacity, also have high combustion stability, Steam Generator in Load Follow, Short-flame, low coal dust also can reduce adhering to of melting ash.
According to the invention of claim 5, adopted make the burner leading section up and down, about freely become The structure of changing can according to circumstances be selected the optimum position of nozzle opening, can change the position of flame eddy current Put the distribution of thermic load in the capable of regulating burner hearth.
According to the invention of claim 6, burner has that horizontal amplitude broadens and height step-down and in narrow district The territory make fuel high heat load burning burner, be configured in the independent additive air of this burner top Mouthful, be configured in the micro-powder fuel pipe and make the rotating plate that micro-powder fuel departs to the stove inboard and make close The aperture area of furnace wall side becomes big and makes the fuel air injection reaction of the air capacity increase of close furnace wall side Mouthful, thus, can reduce the whole height of burner, at narrow zonal combustion fuel and to carry out height hot The load burning utilizes the independent additive air mouth that is configured in the top to consume combustion air, to burner The combustion air throttling of section reduces the generation of NOx, in addition, utilizes rotating plate to make micro-powder fuel at micro mist Change direction in the cartridge, deflection stove inboard simultaneously, utilizes the aperture area that increases near the furnace wall side Fuel air injection reaction mouth increase air capacity near the furnace wall side, thus, raise slag (melting Ash) fusing point can prevent melting ash the adhering to the furnace wall that is caused by aforementioned high heat load.
Like this, reduced the height of burner, reduced manufacturing expense, in addition, reduced in burning The generation of the NOx of device section promotes flammability by the high heat load burning simultaneously, has reduced unburnt ingredient, Can make the powdered coal burner that the melting ash of sening as an envoy to comes off from the furnace wall easily, can access practicality good, The device that reliability is high.
Claims (6)
1, a kind of powdered coal burner, the tangential direction of its imaginary circle on the horizontal plane in the burner hearth drops into the fine coal mist and makes it burning, it is characterized in that, in fine coal gaseous mixture nozzle, be equipped with deep or light chorista, aforementioned fine coal mist is thickened at the central side of imaginary circle.
2, powdered coal burner according to claim 1 is characterized in that, also is provided with the front end gaseous mixture ejiction opening of aforementioned fine coal gaseous mixture nozzle to be cut apart up and down and will catch fire to promote to import device between the ejiction opening of being cut apart with air.
3, a kind of powdered coal burner, the tangential direction of its imaginary circle on the horizontal plane in the burner hearth drops into the fine coal mist and makes it burning, it is characterized in that, make aforementioned fine coal gaseous mixture be provided with fine coal gaseous mixture nozzle prejudicially with respect to air nozzle with thickening at the central side of imaginary circle.
4, powdered coal burner according to claim 3 is characterized in that, also is provided with the device that makes the combustion air rotation of supplying with from the periphery of aforementioned fine coal gaseous mixture nozzle.
5, powdered coal burner according to claim 4 is characterized in that, also is provided with up and down, the device of left and right directions conversion burner leading section.
6, a kind of powdered coal burner, it is characterized in that, comprising: banner broadens and height step-down and make the burner of fuel high heat load burning, the fuel air injection reaction mouth that is configured in independent additive air mouth above this burner, is configured in the micro-powder fuel pipe and makes the rotating plate that micro-powder fuel departs to the stove inboard and make aperture area near the furnace wall side become big and the air capacity near the furnace wall side is increased in narrow zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98116622 CN1112537C (en) | 1998-07-27 | 1998-07-27 | Coal-powder combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98116622 CN1112537C (en) | 1998-07-27 | 1998-07-27 | Coal-powder combustor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1243216A true CN1243216A (en) | 2000-02-02 |
| CN1112537C CN1112537C (en) | 2003-06-25 |
Family
ID=5225176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98116622 Expired - Fee Related CN1112537C (en) | 1998-07-27 | 1998-07-27 | Coal-powder combustor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1112537C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434797C (en) * | 2004-10-10 | 2008-11-19 | 辽宁东电燃烧设备有限公司 | Combustion technology of low nitrogen oxide |
| CN102012019A (en) * | 2010-12-20 | 2011-04-13 | 武汉华是能源环境工程有限公司 | Multiple coal type low-nitrogen direct flow pulverized coal combustion device and control method of nozzle thereof |
| CN102494333A (en) * | 2011-11-14 | 2012-06-13 | 上海锅炉厂有限公司 | Anthracite-combusted single fire ball four-corner direct current burner |
| US8302544B2 (en) | 2006-11-09 | 2012-11-06 | Mitsubishi Heavy Industries, Ltd. | Burner structure |
| CN103196142A (en) * | 2013-04-18 | 2013-07-10 | 河北海丽特种石墨制造有限公司 | Burner for roaster |
| CN103292321A (en) * | 2009-12-17 | 2013-09-11 | 三菱重工业株式会社 | Solid fuel burner and solid fuel boiler |
| TWI494527B (en) * | 2011-11-16 | 2015-08-01 | Mitsubishi Heavy Ind Ltd | Fuel burners, combustible solid fuel burner units and combustible solid fuel boilers |
| US9869469B2 (en) | 2009-12-22 | 2018-01-16 | Mitsubishi Heavy Industries, Ltd. | Combustion burner and boiler including the same |
| CN108225019A (en) * | 2018-03-21 | 2018-06-29 | 中国恩菲工程技术有限公司 | Side-blown converter |
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| CN100594336C (en) * | 2007-08-10 | 2010-03-17 | 杨爱生 | Boiler each secondary air nozzle non-repelling board wind controlling method |
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- 1998-07-27 CN CN 98116622 patent/CN1112537C/en not_active Expired - Fee Related
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| CN100434797C (en) * | 2004-10-10 | 2008-11-19 | 辽宁东电燃烧设备有限公司 | Combustion technology of low nitrogen oxide |
| US8302544B2 (en) | 2006-11-09 | 2012-11-06 | Mitsubishi Heavy Industries, Ltd. | Burner structure |
| CN103292321A (en) * | 2009-12-17 | 2013-09-11 | 三菱重工业株式会社 | Solid fuel burner and solid fuel boiler |
| CN103292321B (en) * | 2009-12-17 | 2016-05-25 | 三菱重工业株式会社 | Solid fuel burns burner and solid fuel burning boiler |
| US10281142B2 (en) | 2009-12-17 | 2019-05-07 | Mitsubishi Heavy Industries, Ltd. | Solid-fuel-fired burner and solid-fuel-fired boiler |
| US9869469B2 (en) | 2009-12-22 | 2018-01-16 | Mitsubishi Heavy Industries, Ltd. | Combustion burner and boiler including the same |
| CN102012019A (en) * | 2010-12-20 | 2011-04-13 | 武汉华是能源环境工程有限公司 | Multiple coal type low-nitrogen direct flow pulverized coal combustion device and control method of nozzle thereof |
| CN102494333A (en) * | 2011-11-14 | 2012-06-13 | 上海锅炉厂有限公司 | Anthracite-combusted single fire ball four-corner direct current burner |
| WO2012159509A1 (en) * | 2011-11-14 | 2012-11-29 | 上海锅炉厂有限公司 | Single fireball quadrangle direct flow burner for combustion of anthracite coal |
| TWI494527B (en) * | 2011-11-16 | 2015-08-01 | Mitsubishi Heavy Ind Ltd | Fuel burners, combustible solid fuel burner units and combustible solid fuel boilers |
| US9702545B2 (en) | 2011-11-16 | 2017-07-11 | Mitsubishi Heavy Industries, Ltd. | Oil-fired burner, solid fuel-fired burner unit, and solid fuel-fired boiler |
| CN103196142A (en) * | 2013-04-18 | 2013-07-10 | 河北海丽特种石墨制造有限公司 | Burner for roaster |
| CN103196142B (en) * | 2013-04-18 | 2015-09-16 | 河北海丽特种石墨制造有限公司 | Combuster for roasting furnace |
| CN108225019A (en) * | 2018-03-21 | 2018-06-29 | 中国恩菲工程技术有限公司 | Side-blown converter |
| CN108225019B (en) * | 2018-03-21 | 2024-01-12 | 中国恩菲工程技术有限公司 | Side-blowing furnace |
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| Publication number | Publication date |
|---|---|
| CN1112537C (en) | 2003-06-25 |
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