CN206861510U - Vertical pulverized-coal fired boiler - Google Patents
Vertical pulverized-coal fired boiler Download PDFInfo
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- CN206861510U CN206861510U CN201720658119.7U CN201720658119U CN206861510U CN 206861510 U CN206861510 U CN 206861510U CN 201720658119 U CN201720658119 U CN 201720658119U CN 206861510 U CN206861510 U CN 206861510U
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Abstract
The utility model discloses a kind of vertical pulverized-coal fired boiler, including：Burner hearth, it includes the side wall positioned at its surrounding, the burner hearth bottom below side wall, the burner hearth cavity formed is surrounded by side wall and burner hearth bottom；At least one coal burner, it includes main body and the burner outlet pipe from main body extension, the main body is arranged on below burner hearth bottom, and burner outlet pipe extends upward into burner hearth cavity and be suitable to the mixture that First air and coal dust are passed through into burner hearth cavity on the outside of burner hearth bottom；And Secondary Air air-distribution device, it is arranged at burner hearth bottom and suitable for being passed through Secondary Air into burner hearth cavity, wherein, and the air compartment including being arranged at the air distribution plate of burner hearth bottom and being in fluid communication with air distribution plate；And burner outlet pipe extends up through air distribution plate on the outside of the burner hearth bottom and entered in burner hearth cavity so that the mixture of First air and coal dust is with secondary air flow mixing to form the wind powder mixture integrally flowed up in laminar flow in burner hearth cavity.
Description
Technical field
Field of boilers is the utility model is related to, more particularly to a kind of vertical pulverized-coal fired boiler.
Background technology
China is difficult to change by the structure in main physical efficiency source of coal within the following some time, the coal that China uses every year
Amount reaches 1,500,000,000 tons, wherein 800,000,000 tons of coals are used for coal-fired thermal power generation, 700,000,000 tons of coals are used for coal-burned industrial boiler.With fire coal
The raising of emission standard of air pollutants for boilers, the high performance clean burning technology of coal are the inevitable requirements of future development.
In addition, in traditional combustion mode, First air, secondary air jet speed and furnace profile average speed difference in burner hearth
It is larger, larger recirculating zone in burner hearth be present, recirculating zone can roll up suction high-temperature flue gas, preheat coal dust, but the control of recirculating zone is more
Complexity, pulverized coal particle easily occurs in recirculating zone and reunites, if fluid field in furnace tissue is bad, Boiler Furnace slagging tendency is big, influences pot
The safety and steady operation of stove.
Tangential firing of traditional combustion system including the use of DC burner and the swirl flow combustion using turbulent burner.
In traditional combustion system, First air carries coal dust and sprays into burner hearth with 20-30m/s speed, and Secondary Air surrounds First air with 30-
40m/s speed sprays into burner hearth, forms the combustion system of bellows chamber powder.For coal dust in specific region concentrated combustion, partial combustion temperature is high,
Cause the NOx raw emissions value of coal dust firing high.For using anthracitic pulverized-coal fired boiler, NOx raw emissions values exceed
800mg/m3；Boiler for using bituminous coal, NOx raw emissions values are generally more than 400mg/m3, the two substantially exceeds related row
Put standard.
In addition, in traditional combustion mode, First air, secondary air jet speed and the air-flow on burner hearth cross section inside burner hearth
Average speed differs greatly, and larger recirculating zone inside burner hearth be present, and recirculating zone can roll up suction high-temperature flue gas, preheats coal dust, but return
It is complex to flow the control in area, pulverized coal particle easily occurs in recirculating zone and reunites, if fluid field in furnace tissue is bad, Boiler Furnace slagging
Tendency is big, influences the safety and steady operation of boiler.
In addition, in the tangential firing mode or swirl flow combustion mode of coal dust, because of coal dust concentrated combustion and release heat, coal
Powder ignition temperature has exceeded ash fusion point, and coal dust firing also easily forms slagging, and part slag is bonded on furnace wall cooling, influences boiler
Heat transfer property., it is necessary to which part slag is discharged from burner hearth bottom during the work of boiler, therefore reduce boiler efficiency.
Utility model content
In order to overcome at least one aspect of above-mentioned prior art defect, the utility model proposes a kind of vertical coal dust pot
Stove, the vertical pulverized-coal fired boiler can realize uniform and efficient burning, the low-nitrogen oxide discharging of coal dust, and avoid coal dust
Grain is in burner hearth accumulated inside.
According to one side of the present utility model, there is provided a kind of vertical pulverized-coal fired boiler, including：
Burner hearth, the burner hearth include the side wall positioned at its surrounding, the burner hearth bottom below side wall, by side wall and burner hearth
Bottom surrounds the burner hearth cavity to be formed；
At least one coal burner, the coal burner include main body and the burner outlet pipe from main body extension,
The main body is arranged on below burner hearth bottom, and the burner outlet pipe is extended upward into burner hearth on the outside of burner hearth bottom
In chamber and suitable for being passed through the mixture of First air and coal dust into burner hearth cavity；And
Secondary Air air-distribution device, the Secondary Air air-distribution device are arranged at burner hearth bottom and suitable for being passed through into burner hearth cavity
Secondary Air,
Wherein, the Secondary Air air-distribution device include be arranged at burner hearth bottom air distribution plate and with air distribution plate be in fluid communication
Air compartment；And
The burner outlet pipe extends up through air distribution plate on the outside of burner hearth bottom and entered in burner hearth cavity so that
The mixture of First air and coal dust and Secondary Air blend in burner hearth cavity with formed in burner hearth cavity in laminar flow integrally to
The wind powder mixture of upper flowing.
According to an exemplary embodiment of the present utility model, the air distribution plate carries blast cap.
According to another exemplary embodiment of the present utility model, it is side wall total height that the side wall of the burner hearth, which includes height,
20%-40% lower sidewall, the lower sidewall is the reverse taper portion that becomes larger from bottom to top of cross section.
According to another exemplary embodiment of the present utility model, the burner hearth includes four side walls, wherein relative two
Piece side wall slopes inwardly in its underpart, and relative other two panels side wall in the vertical direction keeps vertical.
According to another exemplary embodiment of the present utility model, burner hearth includes four side walls, the middle part and bottom of side wall
It is vertical to keep, and the middle part of the burner hearth sidewall and cross section of bottom is generally rectangular shaped and area keeps constant, the middle part and under
The height in portion accounts for the 20% to 40% of side wall total height respectively.
According to another exemplary embodiment of the present utility model, vertical pulverized-coal fired boiler also includes：At least one layer of tertiary air
Spout, it is suitable to be passed through tertiary air into burner hearth and be hierarchically arranged in the side wall of burner hearth, at least one layer of tertiary air spray
One layer of notch setting in mouthful is on the bottom of burner hearth sidewall.
According to another exemplary embodiment of the present utility model, the Secondary Air air-distribution device be arranged at burner hearth bottom with
Cover the whole cross section of burner hearth bottom.
According to another exemplary embodiment of the present utility model, the center between blast cap on the Secondary Air air distribution plate
Away from no more than 300mm.
According to another exemplary embodiment of the present utility model, the eject momentum of the Secondary Air is less than or equal to described
The eject momentum of the mixture of First air and coal dust.
According to another exemplary embodiment of the present utility model, the eject momentum of the Secondary Air is located at the First air
Between the 70% to 90% of the eject momentum of the mixture of coal dust.
According to another exemplary embodiment of the present utility model, the coal burner is pulverized coal preheating burner to incite somebody to action
The mixture of First air and coal dust is preheating to 850 DEG C or more.
According to the vertical pulverized-coal fired boiler of embodiment of the present utility model, using being arranged on the whole cross section of burner hearth bottom
Air distribution plate on Secondary Air is provided, air feed is uniform, almost occur without volume inhale, backflow, the speed difference on burner hearth cross section everywhere
Very little, therefore the wind powder mixture for forming disperse integrally flows up, so as to change conventional bellows chamber powder combustion system.Cause
This, the utility model realizes wind powder mixture overall horizontal sliding flowing upwards in full furnace cavity, and backflow is occurred without in burner hearth
Area, avoid pulverized coal particle gathered in burner hearth, conglomeration, improve system run all right.
Brief description of the drawings
The described in detail below of various embodiments of the present utility model is considered in conjunction with the accompanying drawings, can understand this reality completely
With new, wherein：
Fig. 1 is a kind of burner hearth schematic diagram of vertical pulverized-coal fired boiler of the present utility model；
Fig. 2 is the top view of the Secondary Air air-distribution device in the burner hearth bottom of vertical pulverized-coal fired boiler of the present utility model；
Fig. 3 be according to a kind of top view of embodiment of the burner hearth bottom of vertical pulverized-coal fired boiler of the present utility model, wherein
Burner outlet pipe is not shown；And
Fig. 4 be according to the top view of another embodiment of the burner hearth bottom of vertical pulverized-coal fired boiler of the present utility model, its
Not shown in burner outlet pipe.
Embodiment
Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.
In specification, same or analogous drawing reference numeral indicates same or analogous part.It is following real to the utility model referring to the drawings
The explanation for applying mode is intended to explain present general inventive concept of the present utility model, and is not construed as to the utility model
A kind of limitation.
In addition, in the following detailed description, for ease of explaining, many concrete details are elaborated to provide to draping over one's shoulders herein
The comprehensive understanding of the embodiment of dew.It should be apparent, however, that one or more embodiments are in the case of these no details
It can be carried out.In other cases, known construction and device is diagrammatically embodied to simplify accompanying drawing.
As in the embodiment illustrated in figures 1 and 2, the utility model provides a kind of vertical pulverized-coal fired boiler, the vertical coal dust
Boiler includes：Burner hearth 1, the burner hearth include the side wall 11 positioned at its surrounding, the burner hearth bottom 12 below side wall, by side wall
The burner hearth cavity 13 to be formed is surrounded with burner hearth bottom；At least one coal burner 5, the coal burner include the He of main body 52
From the burner outlet pipe 51 of main body extension, the main body 52 is arranged on the lower section of burner hearth bottom 12, the burner outlet pipe 51
Extended upward into from the outside of burner hearth bottom 12 into burner hearth cavity 13 and suitable for being passed through First air and coal dust into burner hearth cavity
Mixture；And Secondary Air air-distribution device, the Secondary Air air-distribution device are arranged at burner hearth bottom 12 and suitable for into burner hearths
Secondary Air is passed through in chamber 13, wherein, the Secondary Air air-distribution device includes the air distribution plate 3 and and air distribution plate for being arranged at burner hearth bottom
The air compartment 2 of fluid communication；And the burner outlet pipe 51 extends up through air distribution plate 3 from the outside of burner hearth bottom 12 and entered
Enter in burner hearth cavity 13.In an exemplary embodiment of the present utility model, burner hearth bottom 12 can occupy it including one
The opening (not shown) of cross-sectional area about more than 80%, the air distribution plate 3 of the Secondary Air air-distribution device 2 are arranged on the opening
In, so as to which air distribution plate 3 has substantially taken up the substantially whole cross section of burner hearth bottom.Due to from the substantially whole of burner hearth bottom
Supplying secondary air on individual cross section, therefore the speed difference very little everywhere on the cross section of burner hearth, therefore First air and coal dust
Mixture and Secondary Air form the wind powder mixture of disperse without rolling up the phenomenon inhaled and flowed back, therefore wind powder mixture
Flowed up in laminar flow, so as to change conventional bellows chamber powder combustion system.In addition, although as shown in Fig. 2 air distribution plate 3 shows
Go out for rectangular shape, it will be appreciated by those of skill in the art that according to actual conditions, the air distribution plate can be arbitrary shape
Shape, as long as the air distribution plate 3 occupies most of cross-sectional area of burner hearth bottom.
According in an exemplary embodiment of the present utility model, Secondary Air air distribution plate 3 is the plate with multiple through holes
Formula structure, Secondary Air blast cap 4 is installed, so that Secondary Air is passed through burner hearth through secondary air chamber by multiple Secondary Air blast caps in through hole.
Secondary Air can be air or the gaseous mixture of air and flue gas.In one example, blast cap 4 is substantially homogeneously set on air distribution plate 3,
Centre-to-centre spacing between blast cap, which is no more than 300mm, (may be provided with local facility, neighbouring blast cap spacing can be adjusted suitably on air distribution plate
It is whole), Secondary Air is almost uniformly fed burner hearth cavity on whole cross section from burner hearth bottom.
When boiler only sets a preheated burning device 5, burner outlet pipe 51 is preferably located in Secondary Air air distribution plate 3
The heart, it is surround by several Secondary Air blast caps 4.When boiler is provided with multiple preheated burning devices 5, burner outlet pipe 51 is preferably
It is uniformly distributed on Secondary Air air distribution plate 3, each other across some Secondary Air blast caps 4, makes each burner outlet pipe 51
It is surround by Secondary Air blast cap 4.In one example, the quantity of the blast cap 4 can reach hundreds of, therefore no matter set one
Or several preheated burning devices 5, the outlet of the burner is surround by multiple blast caps, rather than just traditional DC burner
Or turbulent burner is such, the First air channel circumference of the burner on burner hearth sidewall is arranged in only arranges that quantity is suitable
Secondary air channel, such as 5 burners are provided with burner hearth sidewall, then 5 secondary air channels are only set.In traditional burning
In device, it usually needs secondary air channel is closely arranged at into First air channel circumference, because only that so from secondary air channel
The wind of middle blowout can tightly surround the mixture of First air and coal dust, and make it that coal dust is not easy to spread, so as to more
Added with beneficial to the high temperature by means of boiler internal and so that coal powder ignition in regional area.However, according to the utility model
Embodiment in, in the region in the region between multiple burner outlet pipes or near a burner outlet pipe,
Set quantity be far longer than burner outlet pipe 51 quantity several blast caps 4, enable to Secondary Air in burner hearth bottom more
Add and equably spray, rather than tightly surround the mixture of First air and coal dust.It is pointed out that combustion as shown in Figure 1
The quantity of burner 5 be 1, but the quantity of burner 5 can according to be actually needed with the area of burner hearth bottom cross section and occur
Change.
According in an exemplary embodiment of the present utility model, as shown in figure 1, the side wall 11 of the burner hearth 1 includes
Highly it is the 20%-40% of side wall total height lower sidewall 111, the lower sidewall 111 is that cross section is gradual from bottom to top
Become big reverse taper portion.Specifically, in one example, as shown in figure 3, the side wall include four side wall SF1, SF2,
SF3 and SF4, wherein relative two panels side wall SF1 and SF3 slopes inwardly with back taper, relative other two panels in its underpart
Side wall SF2 and SF4 in the vertical direction keep vertical.
According in another exemplary embodiment of the present utility model, the area of section of burner hearth can keep constant.One
In individual example, as shown in figure 4, burner hearth includes four side wall SF1 ', SF2 ', SF3 ' and SF4 ', the middle part of side wall and bottom are kept
Vertically, and its cross section is generally rectangular shaped and area keeps constant, wherein middle part and bottom account for burner hearth sidewall total height respectively
20% to 40%.It should be understood that embodiment as shown in Figure 4 illustrate only of the present utility model be preferable to carry out
Example, burner hearth cross section of the present utility model are not limited to cross section as shown in Figure 4, burner hearth cross section can be circular, rectangle with
And other polygons etc..
According in an exemplary embodiment of the present utility model, the vertical pulverized coal boiler also includes at least one layer three
Secondary wind snout 6, it is suitable to be passed through tertiary air into burner hearth and be hierarchically arranged in the side wall 11 of burner hearth, and described at least one layer of three
One layer of notch setting in secondary wind snout 6 is maintained on the bottom of burner hearth sidewall 11 by the tertiary air fed to burner hearth inside
The burning of coal dust and holding section of burner hearth speed are not less than 2.0m/s.In an embodiment as illustrated in figure 3, described at least one layer of three
One layer of spout 6 in secondary wind snout is arranged on the intilted side wall SF1 and SF3 in bottom.
According in an exemplary embodiment of the present utility model, the eject momentum of Secondary Air is less than or equal to described one
The eject momentum of the mixture of secondary wind and coal dust.Further, the eject momentum of the Secondary Air is the First air and coal dust
Mixture eject momentum 70% to 90%.The mixed of First air and coal dust is slightly less than by the eject momentum of Secondary Air
The eject momentum of compound is advantageously in the mixing of Secondary Air and the mixture of First air and coal dust, so as to advantageously in combustion
Burn, the top of burner hearth is reached without being so that Secondary Air earlier than the mixture of First air and coal dust.Wind powder mixture is out of burner hearth
During the lower space of chamber flows up, generating unit divided combustion reaction, the heat transfer of coal dust firing release gives burner hearth bottom
The water-cooling wall of portion's surrounding, with the increase of furnace height and the expansion of furnace cross-sectional area, by the tertiary air fed into burner hearth
Maintain the burning of coal dust and keep section of burner hearth speed to be not less than 2.0m/s.
According in one embodiment of the present utility model, coal burner uses recirculating fluidized bed preheated burning device, by
The coal dust that First air carries can be preheating to 800~850 DEG C of even more high temperature in recirculating fluidized bed preheated burning device, and coal dust exists
Completes to catch fire in burner device, the coal dust of preheating, which is passed through after burner hearth, to be blended rapidly with Secondary Air, stablizes burning.Now pass through
Coal burner be passed through burner hearth First air and coal dust exactly, for the high temperature dusty fuel that is formed after the burning of coal dust part with
High-temperature gas containing a large amount of combustible components.But it will be understood to those skilled in the art that catching fire as coal dust, except adopting
Coal dust is set to have reached the method for ignition temperature when entering burner hearth with preheated burning device etc., can be lighted a fire with using plasma,
Or other processing are carried out to coal dust and are allowed to ignition point reduction etc. method.
When boiler operatiopn, First air and coal dust are passed through from burner hearth bottom 12 to burner hearth cavity 13 by coal burner 5
Mixture, Secondary Air is passed through into burner hearth from burner hearth bottom by Secondary Air blast cap 4, by wind snout three times into burner hearth lead to
Enter tertiary air.Because Secondary Air is uniformly supplied to burner hearth cavity, coordinate rational primary and secondary air eject momentum, at burner hearth bottom
Portion is air distribution plate more than 3, and the mixture of First air and coal dust and secondary air flow mixing be strong, uniformly, almost occurs without volume and inhales, returns
Flow, the speed difference very little on burner hearth cross section everywhere, therefore the wind powder mixture for forming disperse integrally flows up, i.e. wind powder mixes
Compound flows up in laminar flow, so as to change conventional bellows chamber powder combustion system.Wind powder mixture is full of burner hearth cavity, coal
The combustion system of powder is whole audience space combustion in stove, is controlled with reference to the air distribution of tertiary air, coal dust is realized in burner hearth whole audience space
Fractional combustion and samming control.
The tertiary air point multilayer of coal dust firing adds along furnace height, is reducing atmosphere below tertiary air top layer spout,
The multidirectional nitrogen of fuel bound nitrogen discharged in coal dust firing converts.Because concentrated combustion area, coal dust firing are not present in coal dust firing
Highest temperature level it is low, do not generate thermal NO x in coal dust firing substantially.Therefore, NOx raw emissions level is significantly less than often
Advise pulverized coal combustion.
Further, since control section of burner hearth speed not too low in addition in the laminar flow integrally flowed up in burner hearth, will not
Generation coal dust " dry linting ", in addition samming control, sink powder without having to worry about burner hearth bottom and deslagging fall into air compartment, therefore wind can not be set
Cap, Secondary Air is directly provided by the aperture on air distribution plate, the now substantially uniform setting of the aperture on air distribution plate, spacing are no more than
300mm。
On the basis of the vertical pulverized-coal fired boiler according to embodiment of the present utility model, it is next exemplary test of many times has been carried out
The technique effect according to boiler of the present utility model is better described in ground, and specific experiment is as follows：
Experiment 1
On the basis of the vertical pulverized-coal fired boiler of the utility model embodiment, fuel is pulverized bituminous coal, and coal powder size exists
Below 200um, Secondary Air are preheated air and the gaseous mixture of flue gas recirculation, and oxygen content 15%, temperature is 150 DEG C；Three times
Wind is preheated air, and air themperature is 150 DEG C；The efficiency of combustion for measuring pulverized bituminous coal is that 99.2%, NOx raw emissions values are
120mg/Nm3, NOx raw emissions values are significantly reduced, realize the efficient low nitrogen burning of bituminous coal.
Experiment 2
On the basis of the vertical pulverized-coal fired boiler of the utility model embodiment, fuel is the very low semi--coke powder of volatile matter,
Using circulating fluid bed type preheated burning device, burner hearth will be sprayed into First air mixture by the coke powder for being preheated to 850 DEG C；It is secondary
Air temperature is 200 DEG C；Coke powder air-flow superficial velocity is 3.0m/s inside burner hearth, and combustion temperature in hearth is 1100 DEG C；Along burner hearth
Short transverse, arrange two layers of tertiary air.Result of the test shows that the efficiency of combustion of semicoke is for 96.5%, NOx raw emissions levels
50mg/Nm3, NOx raw emissions values are significantly reduced, realize the efficient low nitrogen burning of the fire retardant fuel of low volatile.
Therefore, in the vertical pulverized-coal fired boiler according to the utility model embodiment, using being arranged at the whole of burner hearth bottom
Secondary Air is provided on air distribution plate on cross section, air feed is uniform, almost occurs without volume and inhales, flows back, on burner hearth cross section everywhere
Speed difference very little, therefore the wind powder mixture for forming disperse integrally flows up, so as to change conventional bellows chamber powder burning
Mode.Therefore, the utility model realizes wind powder mixture overall horizontal sliding flowing upwards in full furnace cavity, does not go out in burner hearth
Existing recirculating zone, avoid pulverized coal particle gathered in burner hearth, conglomeration, improve system run all right.
Further, because the utility model breaches the bellows chamber powder mode of normal burner so that coal dust is in whole stove
Burning uniformity of temperature profile, has stabilized the maximum temperature of coal dust firing in thorax space, so can realize that samming burns, so as to
With the present situation for changing the concentrated combustion of conventional combustion manner and concentrating heat release, make to concentrate height in the stove in conventional pulverized-coal combustion system
Warm area disappears, and does not produce thermal NO x.
Further, because realizing samming burning in burner hearth cavity, the samming burning of coal dust makes the highest temperature in stove
Degree is less than ash fusion point, avoids slagging, and flying dust fully enters afterbody with flue gas caused by coal dust firing, therefore in boiler operatiopn not
Deslagging is needed, boiler thermal output is high, and system manipulation is simple.
Further, coal dust samming burning also makes fire box temperature be evenly distributed, the more conventional burning side of mean temperature in stove
Formula mean temperature is high, radiant heat transfer ability enhancing in stove, can reduce boiler volume, save boiler cost.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be changed in the case where not departing from principle of the present utility model and spirit, this practicality
New scope is defined by the appended claims and the equivalents thereof.
Claims (11)
1. a kind of vertical pulverized-coal fired boiler, including：
Burner hearth, the burner hearth include the side wall positioned at its surrounding, the burner hearth bottom below side wall, by side wall and burner hearth bottom
Surround the burner hearth cavity formed；
At least one coal burner, the coal burner includes main body and the burner outlet pipe from main body extension, described
Main body is arranged on below burner hearth bottom, and the burner outlet pipe is extended upward into burner hearth cavity on the outside of burner hearth bottom
And suitable for being passed through the mixture of First air and coal dust into burner hearth cavity；And
Secondary Air air-distribution device, the Secondary Air air-distribution device be arranged at burner hearth bottom and suitable for be passed through into burner hearth cavity it is secondary
Wind,
Characterized in that, the Secondary Air air-distribution device includes the air distribution plate for being arranged at burner hearth bottom and is in fluid communication with air distribution plate
Air compartment；And
The burner outlet pipe extends up through air distribution plate on the outside of burner hearth bottom and entered in burner hearth cavity so that once
The mixture of wind and coal dust blends overall to upstream in laminar flow to be formed in burner hearth cavity with Secondary Air in burner hearth cavity
Dynamic wind powder mixture.
2. vertical pulverized-coal fired boiler according to claim 1, it is characterised in that the air distribution plate carries blast cap.
3. vertical pulverized-coal fired boiler according to claim 1, it is characterised in that it is side wall that the side wall of the burner hearth, which includes height,
The 20%-40% of total height lower sidewall, the lower sidewall are the reverse taper portion that cross section becomes larger from bottom to top.
4. vertical pulverized-coal fired boiler according to claim 3, it is characterised in that the burner hearth includes four side walls, wherein phase
To two panels side wall slope inwardly in its underpart, relative other two panels side wall in the vertical direction keeps vertical.
5. vertical pulverized-coal fired boiler according to claim 1, it is characterised in that burner hearth includes four side walls, the middle part of side wall
Keep vertical with bottom, and the middle part of the burner hearth sidewall and cross section of bottom is generally rectangular shaped and area keeps constant, in described
The height of portion and bottom accounts for the 20% to 40% of side wall total height respectively.
6. the vertical pulverized-coal fired boiler according to claim 3 or 5, in addition to：At least one layer of wind snout three times, it is suitable to stove
Tertiary air is passed through in thorax and is hierarchically arranged in the side wall of burner hearth, one layer of spout at least one layer of wind snout three times is set
Put on the bottom of burner hearth sidewall.
7. the vertical pulverized-coal fired boiler according to claim 3 or 5, it is characterised in that the Secondary Air air-distribution device is arranged at
Burner hearth bottom is to cover the whole cross section of burner hearth bottom.
8. vertical pulverized-coal fired boiler according to claim 2, it is characterised in that between the blast cap on the Secondary Air air distribution plate
Centre-to-centre spacing be not more than 300mm.
9. vertical pulverized-coal fired boiler according to claim 1, it is characterised in that the eject momentum of the Secondary Air is less than or waited
In the First air and the eject momentum of the mixture of coal dust.
10. vertical pulverized-coal fired boiler according to claim 9, it is characterised in that the eject momentum of the Secondary Air is located at institute
Between state the eject momentum of the mixture of First air and coal dust 70% to 90%.
11. vertical pulverized-coal fired boiler according to claim 1, it is characterised in that the coal burner fires for pulverized coal preheating
Burner by the mixture of First air and coal dust to be preheating to 850 DEG C or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720658119.7U CN206861510U (en) | 2017-06-07 | 2017-06-07 | Vertical pulverized-coal fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720658119.7U CN206861510U (en) | 2017-06-07 | 2017-06-07 | Vertical pulverized-coal fired boiler |
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| Publication Number | Publication Date |
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| CN206861510U true CN206861510U (en) | 2018-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023824A (en) * | 2017-06-07 | 2017-08-08 | 中国科学院工程热物理研究所 | Vertical pulverized-coal fired boiler |
-
2017
- 2017-06-07 CN CN201720658119.7U patent/CN206861510U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023824A (en) * | 2017-06-07 | 2017-08-08 | 中国科学院工程热物理研究所 | Vertical pulverized-coal fired boiler |
| CN107023824B (en) * | 2017-06-07 | 2023-08-22 | 兖矿中科清洁能源科技有限公司 | Vertical pulverized coal boiler |
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