CN204717726U - The horizontally disposed not accumulated powder of boiler milling system primary air piping fixes shrinkage cavity system - Google Patents
The horizontally disposed not accumulated powder of boiler milling system primary air piping fixes shrinkage cavity system Download PDFInfo
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- CN204717726U CN204717726U CN201520358925.3U CN201520358925U CN204717726U CN 204717726 U CN204717726 U CN 204717726U CN 201520358925 U CN201520358925 U CN 201520358925U CN 204717726 U CN204717726 U CN 204717726U
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- shrinkage cavity
- accumulated powder
- primary air
- level
- air piping
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- 239000000843 powder Substances 0.000 title claims abstract description 38
- 238000003801 milling Methods 0.000 title claims abstract description 10
- 239000002817 coal dust Substances 0.000 claims abstract description 18
- 238000004880 explosion Methods 0.000 abstract description 4
- 238000010304 firing Methods 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000003245 coal Substances 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
Abstract
The horizontally disposed not accumulated powder of a kind of boiler milling system primary air piping fixes shrinkage cavity system, this device comprises the coal dust airduct that level is installed and the fixing shrinkage cavity be arranged in a coal dust airduct, is provided with the anti-accumulated powder device of the domatic shape downward-sloping gradually to both sides in the both sides, lower end of fixing shrinkage cavity.Advantage of the present utility model is as follows: the not accumulated powder that level is installed fixes shrinkage cavity device tool not accumulated powder feature, will avoid hoarding along with domatic landing when there being accumulated powder.There is throttling action, same grate firing burner each primary air piping speed can be controlled even.After the fixing shrinkage cavity device that accumulated powder level is not installed is installed, primary air piping does not need to carry out leveling test.The fixing shrinkage cavity top accumulated powder that level can be avoided to install glows risk of explosion.The not accumulated powder that level is installed is fixed shrinkage cavity device and is had wear-resistant feature.
Description
Technical field
The not accumulated powder that the utility model relates to a kind of boiler milling system primary air piping horizontally disposed fixes shrinkage cavity system, is applied to thermal power plant pulverized-coal fired boiler pulverized coal preparation system.
Background technology
Burner keeps suitable First air, Secondary Air and is separated burnout degree (OFA wind or SOFA wind) and exports even speed, is set up one of normal aerodynamic field and the necessary primary condition of smooth combustion.Too high can the postponement of primary air velocity is caught fire, too low then easy scaling loss burner, and in primary air piping, cause coal dust to deposit.The too high or too low normal hybrid perturbation that all may destroy air-flow of secondary wind speed.Thus reduce stability and the economy of burning.Being separated burnout degree is the fractional combustion wind controlling nitrogen oxide (NOx), within the specific limits, increases burnout degree and can reduce nitrogen oxide.Burnout degree affects boiler environmental-protecting performance.The size of burner outlet section and air velocity determine the percentage of primary air flow, secondary air flow and after-flame air quantity.This parameter is also that firing optimization needs to pay attention to.Especially primary air ratio, it and ignition process are closely related.Primary air ratio is larger, needing the heat of absorption just the more, thus reaching the required duration of catching fire just longer for reaching primary mixture ignition temperature.This fire coal low to volatile matter is very disadvantageous, more unfavorable when a wind-warm syndrome is lower.But, to the fire coal of high volatile, maintain fight not difficult, and after catching fire for ensure burning in time of volatile matter need higher primary air ratio.Boiler carries out needing when wind speed (air quantity) adjusts to consider security, economy and the feature of environmental protection.
In order to ensure boiler safety stabilize the economy environmental protection run, the layout of powder feeding pipes should make each powder feeding pipes air-flow and coal powder distribation even, the powder feeding pipes resistance of each burner should be as far as possible close, shrinkage cavity or other adjustment members can be installed if desired additional, by the shrinkage cavity on adjustment primary air piping, be not more than scholar 5% to make the deviate of the relative mean wind speed of each primary air piping maximum wind velocity.
Shrinkage cavity is the measure of a kind of fairly simple equal distribution stream and coal dust, and arrangement convenience, does not take up room.Shrinkage cavity mainly contains adjustable contraction and fixing shrinkage cavity two kinds.Adjustable contraction uses flexibly, as required, can carry out cold and hot state adjustment, but adjustment is complicated.Fixing shrinkage cavity structure is simple, do not need adjustment, but system needs accurate Calculation after installation, and when shrinkage cavity serious wear, pipeline enclosure allocation of the amount of air average deviation is comparatively large, when having a strong impact on stove combustion operating mode and boiler thermal output, needs to change shrinkage cavity orifice plate.
For 1000MW unit bituminous coal boiler, have 48 burners, combusting brown coal boiler-burner is more, if installation adjustable contraction adjustment workload is very large.Along with the development of Fluid Mechanics Computation technology, calculate accuracy and precision more and more higher, theory calculate meets completely installs fixing shrinkage cavity requirement.
Coal dust deposits in the duct for a long time and causes spontaneous combustion of pulverized coal, and coal dust temperature is higher, and spontaneous combustion is faster.Accumulated powder spontaneous combustion is the burning things which may cause a fire disaster producing blast.Therefore for preventing the blast of coal dust, should there is not projection and out-of-flatness place of retardance coal dust, avoid the deposition of coal dust in all another parts of pulverized coal preparation system.
Boiler coal-ash particle size great majority are less than 200 μm, and coal powder density is generally at 0.3kg/m
3~ 0.6kg/m
3between, be in and hold explosive dangerous concentrations scope most.
In boiler medium-speed pulverizer pulverized coal preparation system primary mixture, oxygen content is all greater than 14%, close to the oxygen amount in air, is in oxygen amount explosion ratio scope.
The shrinkage cavity of present use, time especially horizontally disposed, coal dust has a lot of depositions.
Summary of the invention
Utility model object: the utility model provides the horizontally disposed not accumulated powder of a kind of boiler milling system primary air piping to fix shrinkage cavity system, object is to solve boiler milling system primary air piping vertically arranged shrinkage cavity accumulated powder problem.
Technical scheme: the utility model is achieved through the following technical solutions:
The horizontally disposed not accumulated powder of a kind of boiler milling system primary air piping fixes shrinkage cavity system, it is characterized in that: this device comprises the coal dust airduct that level is installed and the fixing shrinkage cavity be arranged in a coal dust airduct, is provided with the anti-accumulated powder device of the domatic shape downward-sloping gradually to both sides in the both sides, lower end of fixing shrinkage cavity.
Advantage and effect: the utility model provides the horizontally disposed not accumulated powder of a kind of boiler milling system primary air piping to fix shrinkage cavity system, the position of accumulated powder may be produced in order to control coal dust pipeline, avoid coal dust to deposit to set off an explosion, the not accumulated powder that the level that devises is installed fixes shrinkage cavity, accumulated powder is not fixed shrinkage cavity device and can be used and the fixing shrinkage cavity same metal material used now, or uses wear-resisting nonmetallic materials.
Advantage of the present utility model is as follows:
The not accumulated powder that the utility model level is installed fixes shrinkage cavity device tool not accumulated powder feature, will avoid hoarding along with domatic landing when there being accumulated powder.
The utility model has throttling action, can control same grate firing burner each primary air piping speed even.
After the utility model fixing shrinkage cavity device that accumulated powder level is not installed is installed, primary air piping does not need to carry out leveling test.
The fixing shrinkage cavity top accumulated powder that the utility model can avoid level to install glows risk of explosion.
The not accumulated powder that the utility model level is installed is fixed shrinkage cavity device and is had wear-resistant feature.
accompanying drawing illustrates:
Schematic diagram is arranged in the fixing shrinkage cavity that the level that Fig. 1 uses now is installed;
Fig. 2 is that schematic diagram is arranged in the fixing shrinkage cavity that the level of the utility model not accumulated powder is installed.
detailed description of the invention:below in conjunction with accompanying drawing, the utility model is described further:
As shown in Figure 1, the utility model provides the horizontally disposed not accumulated powder of a kind of boiler milling system primary air piping to fix shrinkage cavity system, this device comprises the coal dust airduct 1 that level is installed and the fixing shrinkage cavity 2 be arranged in a coal dust airduct 1, is provided with the anti-accumulated powder device 3 of the domatic shape downward-sloping gradually to both sides in the both sides, lower end of fixing shrinkage cavity 2.Distinctive domatic anti-accumulated powder device 3 realizes the object avoiding accumulated powder.
Claims (1)
1. the not accumulated powder that a boiler milling system primary air piping is horizontally disposed fixes shrinkage cavity system, it is characterized in that: this device comprises the coal dust airduct (1) that level is installed and the fixing shrinkage cavity (2) be arranged in a coal dust airduct (1), is provided with the anti-accumulated powder device (3) of the domatic shape downward-sloping gradually to both sides in the both sides, lower end of fixing shrinkage cavity (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520358925.3U CN204717726U (en) | 2015-05-29 | 2015-05-29 | The horizontally disposed not accumulated powder of boiler milling system primary air piping fixes shrinkage cavity system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520358925.3U CN204717726U (en) | 2015-05-29 | 2015-05-29 | The horizontally disposed not accumulated powder of boiler milling system primary air piping fixes shrinkage cavity system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204717726U true CN204717726U (en) | 2015-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520358925.3U Active CN204717726U (en) | 2015-05-29 | 2015-05-29 | The horizontally disposed not accumulated powder of boiler milling system primary air piping fixes shrinkage cavity system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204717726U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864405A (en) * | 2015-05-29 | 2015-08-26 | 国家电网公司 | Pulverized coal accumulation prevention fixing shrinkage cavity device with horizontally-arranged primary air pipes for boiler coal pulverizing system |
-
2015
- 2015-05-29 CN CN201520358925.3U patent/CN204717726U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864405A (en) * | 2015-05-29 | 2015-08-26 | 国家电网公司 | Pulverized coal accumulation prevention fixing shrinkage cavity device with horizontally-arranged primary air pipes for boiler coal pulverizing system |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |