CN209655281U - A kind of high speed flow-disturbing wind apparatus - Google Patents
A kind of high speed flow-disturbing wind apparatus Download PDFInfo
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- CN209655281U CN209655281U CN201920042985.2U CN201920042985U CN209655281U CN 209655281 U CN209655281 U CN 209655281U CN 201920042985 U CN201920042985 U CN 201920042985U CN 209655281 U CN209655281 U CN 209655281U
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Abstract
The utility model provides a kind of high speed flow-disturbing wind apparatus, including the nozzle layer pipeline at least provided with one layer, the output end of every layer of nozzle layer pipeline is provided with several nozzles, the arrangement of nozzles boiler primary zone lowest level nozzle between furnace arch, furnace nose water-cooling wall or furnace quadrangle on, the input terminal of every layer of nozzle layer pipeline is connected to the main air duct output channel of connection main air duct, the main air duct output channel and nozzle layer pipeline are respectively arranged with regulating device, the regulating device is used to make to spray into the air quantity of water-cooling wall generation by nozzle within the 15% of boiler furnace total blast volume；The utility model does not need change boiler original system equipment, pipeline need to be only arranged outside furnace, bend pipe or the aperture arrangement high-speed jet nozzle in the secondary air box of furnace quadrangle on boiler setting water-cooling wall, system structure is simple, easy to implement, and air quantity wind speed is adjustable, aerodynamic field big in furnace is not influenced, feasibility is high, facilitates the after-flame of pulverized coal particle, reduces boiler flyash carbon content.
Description
Technical field
The utility model relates to boiler plant technical field, in particular to a kind of high speed flow-disturbing wind apparatus.
Background technique
The height of boiler flyash carbon content is one of the principal element for influencing boiler efficiency, when other heat loss of boiler reach
When having arrived design objective, the key that unburned carbon in flue dust has become boiler energy-saving consumption reduction how is reduced.In recent years, due to coal reserves
Decline, so that coal price in the market floats, to reduce operating cost, most of power plant, which begin to use, mixes with breeding, height
Volatile coal is mixed with low-volatile coal, and fugitive constituent is made to reach the requirement of boiler design coal.For coal itself, no
Congener coal microstructure and porosity are all different, thus its burnout rate differs greatly.In addition, low-volatile coal can be ground is
Number is small, and powder processed is difficult, and it is mostly low-volatile coal that this, which allows for mixing with coarse granule after coal powder,.Therefore, it mixes and is made with coal
Coal dust spray into burner hearth after, high-volatile catches fire first, consume most oxygen, low-volatile coal postignition, oxygen at this time
Gas concentration becomes very little, and after-flame is extremely difficult, higher so as to cause unburned carbon in flue dust.In addition, in order to reduce the row of nitrogen oxides
High-volume, most of power plant has carried out low nitrogen burning transformation, and principle is to form anoxycausis in main burning area, builds reproducibility gas
Atmosphere inhibits the generation of nitrogen oxides.For the mechanism of coal combustion, burning is violent oxidation reaction, need oxygen with can
Combustion things come into full contact with, and oxygen concentration is higher, and burning is more violent, and anoxycausis is unfavorable for the after-flame of coal dust, thus the low nitrogen combustion of most boilers
Preceding increased relatively is transformed in unburned carbon in flue dust after burning transformation.To solve this problem, low nitrogen burning reforming technology is usually in primary zone
Burnout degree nozzle is arranged on top, and burnout degree wind regime is hot Secondary Air, i.e., by the Secondary Air of primary zone reduction in the form of burnout degree
It is sent into burner hearth, to reduce unburned carbon in flue dust.The technology is not can effectively solve main burning area coal in primary zone upper supplementary oxygen
The problem of powder particles and oxygen cannot be contacted effectively.
Therefore, under the premise of not changing boiler original operating condition, how to make coal dust and the oxygen molecule in air abundant
Contact improves the after-flame degree of coal dust, reduces unburned carbon in flue dust, the urgent problem to be solved to lower consumption at coal-burning boiler energy-saving.
Utility model content
The utility model provides a kind of high speed flow-disturbing wind apparatus, can solve coal-burning boiler coal burnout rate in the prior art
The high problem of difference, unburned carbon in flue dust.
The utility model in order to solve the above problem the technical solution adopted is that:
A kind of high speed flow-disturbing wind apparatus, including the nozzle layer pipeline at least provided with one layer, every layer of nozzle layer pipeline it is defeated
Outlet is provided with several nozzles, and the arrangement of nozzles is in boiler primary zone lowest level nozzle to the water-cooling wall or furnace between furnace arch, furnace nose
On quadrangle, the input terminal of every layer of nozzle layer pipeline is connected to the main air duct output channel of connection main air duct, the main air duct output
Pipeline and nozzle layer pipeline are respectively arranged with regulating device, and the regulating device sprays into water-cooling wall generation by nozzle for making
Air quantity within the 15% of boiler furnace total blast volume.
More preferably, the nozzle layer pipeline is provided with 3~6 layers.
More preferably, the nozzle quantity of the output end setting of every layer of nozzle layer pipeline is 12~30.
More preferably, the shape of the nozzle is one of round, ellipse or rectangle, and equivalent diameter is 50~300mm.
More preferably, the flow-disturbing wind regime inputted in the main air duct is in hot wind, cold wind, hot stove cigarette, steam or compressed air
One or more.
More preferably, the pressure in the main air duct pipeline is greater than 2kPa.
More preferably, the flow-disturbing wind regime wind speed that the main air duct provides is higher than secondary wind wind speed.
More preferably, the pattern of the nozzle be direct current or eddy flow, the axis direction of nozzle be positive the circle of contact, the traditional method of indicating the pronunciation of a Chinese character circle or
Face burner hearth center.
More preferably, expansion joint is provided on the main air duct output channel.
More preferably, for the main air duct output channel wind speed between 5~30m/s, the jet expansion wind speed is set as 40
~70m/s.
Compared with the prior art, the advantages of the utility model are:
The utility model does not need change boiler original system equipment, pipeline only need to be arranged outside furnace, in boiler setting water cooling
Bend pipe or the aperture arrangement high-speed jet nozzle in the secondary air box of furnace quadrangle on wall, system structure is simple, easy to implement, and air quantity
Wind speed is adjustable, does not influence aerodynamic field big in furnace, and feasibility is high, facilitates the after-flame of pulverized coal particle, reduces boiler fly ash
Phosphorus content.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the wall coverings flow-disturbing wind in the utility model one embodiment；
Fig. 2 is that the present apparatus is arranged in the structural schematic diagram on boiler in the utility model one embodiment.
Description of symbols:
1, nozzle layer pipeline, 2, nozzle, 3, main air duct output channel, 4, main air duct, 5, regulating device, 6, expansion joint.
Specific embodiment
With reference to the accompanying drawing, a specific embodiment of the utility model is described in detail, it is to be understood that this
The protection scope of utility model is not limited by the specific implementation.
As shown in Figures 1 and 2, a kind of high speed flow-disturbing wind apparatus provided by the embodiment of the utility model, including be at least arranged
There is one layer of nozzle layer pipeline 1, the output end of every layer of nozzle layer pipeline 1 is provided with several nozzles 2, and the nozzle 2 is arranged in pot
Furnace primary zone lowest level nozzle 2 between furnace arch, furnace nose water-cooling wall or furnace quadrangle on, the input terminal connection of every layer of nozzle layer pipeline 1
To the main air duct output channel 3 of connection main air duct 4, the main air duct output channel 3 and nozzle layer pipeline 1 are respectively arranged with tune
Regulating device 5, the regulating device 5 are used to make to spray into the air quantity of water-cooling wall generation by nozzle 2 in boiler furnace total blast volume
Within 15%.
Specifically, the nozzle layer pipeline 1 is provided with 3~6 layers.
Specifically, 2 quantity of nozzle of the output end setting of every layer of nozzle layer pipeline 1 is 12~30.
Specifically, the shape of the nozzle 2 is one of round, ellipse or rectangle, equivalent diameter is 50~
300mm, to guarantee the circulation area of nozzle 2.More specifically, the material of the nozzle 2 can use heat resisting steel, anti-oxidant temperature
Degree is not less than 1000 DEG C.
Specifically, the flow-disturbing wind regime inputted in the main air duct 4 is in hot wind, cold wind, hot stove cigarette, steam or compressed air
One or more.
Specifically, the pressure in 4 pipeline of main air duct is greater than 2kPa.
Specifically, the flow-disturbing wind regime wind speed that the main air duct 4 provides is higher than secondary wind wind speed.
Specifically, the pattern of the nozzle 2 be direct current or eddy flow, the axis direction of nozzle 2 be positive the circle of contact, the traditional method of indicating the pronunciation of a Chinese character circle
Or face burner hearth center.
Specifically, it is provided with expansion joint 6 on the main air duct output channel 3, to compensate nozzle 2 and pipeline, pipeline and pipe
Displacement between road.
Specifically, between 5~30m/s, 2 air outlet velocity of nozzle is set as 3 wind speed of main air duct output channel
40~70m/s.
In the above-mentioned technical solutions, furnace pressure is -50Pa or so, if 2 wind speed of nozzle will reach between 40~70m/s,
According to fluid mechanics equation, simplified model does not consider that the resistance of ducting is lost, i.e. the differential pressure dynamic pressure that is completely converted into working medium, formula
It is as follows:
1/2 ρ v of Δ P=ξ *2,
In formula ξ be spout outlet resistance coefficient, take 1.5, ρ be corresponding atmospheric density, take 0.824, v be spout outlet most
Small wind speed, takes 40m/s, is computed, and Δ P minimum value is 988Pa.Accordingly, it is considered to the drag losses and other factors of pipeline, wind regime
Pressure need to just be able to satisfy technique requirement in 2kPa or more.
Meanwhile overfire air port wind speed about 45m/s in boiler running process declines if flow-disturbing wind wind speed is lower than Secondary Air
Secondary Air can be faster than by subtracting, and the requirement for penetrating flow field is not achieved, and therefore, flow-disturbing wind wind speed must be higher than Secondary Air.Air velocity duct according to
" thermal power plant DL/T5121-2000 cigarette wind pulverized coal channel designing technique regulation " is chosen.
Furthermore by taking 300MW unit as an example, total blast volume is about 1000t/h or so, flow-disturbing wind maximum quantity of wind 15%, i.e. 50t/
H, room temperature lower volume flow is about 11.2m3/ s, 12 nozzles 2 of every layer arrangement, 5 layers of arrangement, i.e., 60,2 flow of single-nozzle
0.186m3/ s, wind speed choose 50m/s, then 2 circulation area of single-nozzle is 0.0037 square metre, and convert equivalent diameter 68mm.By
Need 2 circulation area of nozzle bigger, therefore 2 equivalent diameter of nozzle exists when Temperature of Working parameter is higher than room temperature in boiler type multiplicity
Between 50~300mm.
The device that the utility model uses obtains the process of flow-disturbing wind wind regime as flow-disturbing wind passes through 4 pipeline of main air duct and spray
Mouth layer pipeline 1 is connected on nozzle 2, and total flow-disturbing air quantity is adjusted by the regulating device 5 being arranged on main pipeline, single-nozzle 2
Wind speed adjusted by the regulating device 5 on branch pipe(tube), since 2 wind speed of nozzle is high, rigidity is strong, there is stronger penetration power, can
So that small-scale turbulent flow occurs for fluid field in furnace, is conducive to the mixing of coal dust and oxygen, coal dust can be enabled to overheavy firing
Burn-off rate improve, reduce unburned carbon in flue dust.
Disclosed above is only several specific embodiments of the utility model, and still, the utility model embodiment is not office
It is limited to this, the changes that any person skilled in the art can think of should all fall into the protection scope of the utility model.
Claims (10)
1. a kind of high speed flow-disturbing wind apparatus, it is characterised in that: including the nozzle layer pipeline (1) at least provided with one layer, every layer of spray
The output end of mouth layer pipeline (1) is provided with several nozzles (2), and the nozzle (2) is arranged in boiler primary zone lowest level nozzle (2)
To between furnace arch, furnace nose water-cooling wall or furnace quadrangle on, the input terminal of every layer of nozzle layer pipeline (1) is connected to connection main air duct (4)
Main air duct output channel (3), the main air duct output channel (3) and nozzle layer pipeline (1) are respectively arranged with regulating device
(5), the regulating device (5) is used to make to spray into the air quantity of water-cooling wall generation by nozzle (2) in boiler furnace total blast volume
Within 15%.
2. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: nozzle layer pipeline (1) setting
There are 3~6 layers.
3. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: every layer of nozzle layer pipeline (1) it is defeated
Nozzle (2) quantity of outlet setting is 12~30.
4. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: the shape of the nozzle (2) is circle
One of shape, ellipse or rectangle, equivalent diameter are 50~300mm.
5. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: inputted in the main air duct (4)
Flow-disturbing wind regime is one or more of hot wind, cold wind, hot stove cigarette, steam or compressed air.
6. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: in main air duct (4) pipeline
Pressure is greater than 2kPa.
7. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: what the main air duct (4) provided disturbs
It flows wind regime wind speed and is higher than secondary wind wind speed.
8. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: the pattern of the nozzle (2)
For direct current or eddy flow, the axis direction of nozzle (2) is positive the circle of contact, traditional method of indicating the pronunciation of a Chinese character circle or face burner hearth center.
9. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: the main air duct output channel (3)
On be provided with expansion joint (6).
10. a kind of high speed flow-disturbing wind apparatus according to claim 1, it is characterised in that: the main air duct output channel (3)
For wind speed between 5~30m/s, nozzle (2) air outlet velocity is set as 40~70m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920042985.2U CN209655281U (en) | 2019-01-10 | 2019-01-10 | A kind of high speed flow-disturbing wind apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920042985.2U CN209655281U (en) | 2019-01-10 | 2019-01-10 | A kind of high speed flow-disturbing wind apparatus |
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| CN209655281U true CN209655281U (en) | 2019-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668145A (en) * | 2019-01-10 | 2019-04-23 | 中节环立为（武汉）能源技术有限公司 | A kind of high speed flow-disturbing wind apparatus |
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2019
- 2019-01-10 CN CN201920042985.2U patent/CN209655281U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668145A (en) * | 2019-01-10 | 2019-04-23 | 中节环立为（武汉）能源技术有限公司 | A kind of high speed flow-disturbing wind apparatus |
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