CN204880194U - Not long -pending fixed shrinkage cavity system of powder that tuber pipe of boiler powder process system was arranged perpendicularly - Google Patents
Not long -pending fixed shrinkage cavity system of powder that tuber pipe of boiler powder process system was arranged perpendicularly Download PDFInfo
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- CN204880194U CN204880194U CN201520358887.1U CN201520358887U CN204880194U CN 204880194 U CN204880194 U CN 204880194U CN 201520358887 U CN201520358887 U CN 201520358887U CN 204880194 U CN204880194 U CN 204880194U
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- 239000000843 powder Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title abstract description 3
- 239000002817 coal dust Substances 0.000 claims description 16
- 238000003801 milling Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 abstract description 8
- 238000004880 explosion Methods 0.000 abstract description 4
- 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
- 238000010304 firing 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
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
Abstract
The utility model provides a not long -pending fixed shrinkage cavity system of powder that tuber pipe of boiler powder process system was arranged perpendicularly, the device includes buggy tuber pipe of perpendicular installation with set up the fixed shrinkage cavity in a buggy tuber pipe, is provided with along hole edge domatic by narrow widen gradually upwards in the upper end of fixed shrinkage cavity, should domaticly make upper end of fixed shrinkage cavity form infundibulate and prevent long -pending whitewashed device. The utility model has the advantages that: : avoid the fixed shrinkage cavity upper portion long -pending powder in position all around, can realize preventing long -pending powder along with the long -pending powder device landing of preventing of infundibulate when long -pending powder. Have throttling action, can control with layer each tuber pipe speed of combustor evenly. Shrinkage cavity device installation back is fixed to the powder that does not amass of perpendicular installation, and one time the tuber pipe need not carry out the leveling experiment. Can avoid the long -pending whitewashed explosion risk that glows in fixed shrinkage cavity upper portion of perpendicular installation. The fixed shrinkage cavity device of not long -pending powder of perpendicular installation has stand wear and tear characteristics.
Description
Technical field
The utility model relates to the vertically arranged not accumulated powder of a kind of boiler milling system primary air piping and 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, when being especially arranged vertically, coal dust has a large amount of depositions.
Summary of the invention
Utility model object: the utility model provides the vertically arranged 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 vertically arranged 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 a vertically arranged coal dust airduct and is arranged on the fixing shrinkage cavity in a coal dust airduct, be provided with in the upper end of fixing shrinkage cavity along bore edges upwards gradually by narrow broaden domatic, this is domatic makes upper end of fixing shrinkage cavity form the anti-accumulated powder device of infundibulate.
Advantage and effect: the utility model provides the vertically arranged 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, devise vertically arranged not accumulated powder and fix 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 utility model avoids surrounding position, fixing shrinkage cavity top accumulated powder, can realize preventing accumulated powder along with funnel shaped anti-accumulated powder device 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 vertically arranged not accumulated powder of the utility model fixes shrinkage cavity device installation, primary air piping does not need to carry out leveling test.
The utility model can avoid vertically arranged fixing shrinkage cavity top accumulated powder to glow risk of explosion.
The vertically arranged not accumulated powder of the utility model is fixed shrinkage cavity device and is had wear-resistant feature.。
accompanying drawing illustrates:
Schematic diagram is arranged in the vertically arranged fixing shrinkage cavity that Fig. 1 uses now;
Fig. 2 is that schematic diagram is arranged in the vertically arranged fixing shrinkage cavity of the utility model not accumulated powder.
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 vertically arranged not accumulated powder of a kind of boiler milling system primary air piping to fix shrinkage cavity system, the fixing shrinkage cavity 2 that this device comprises a vertically arranged coal dust airduct 1 and is arranged in a coal dust airduct 1, be provided with in the upper end of fixing shrinkage cavity 2 along bore edges upwards gradually by narrow broaden domatic, this is domatic makes upper end of fixing shrinkage cavity 2 form the anti-accumulated powder device 3 of infundibulate.The domatic anti-accumulated powder device 3 of distinctive infundibulate realizes the object avoiding accumulated powder.
Claims (1)
1. the vertically arranged not accumulated powder of boiler milling system primary air piping fixes shrinkage cavity system, it is characterized in that: the fixing shrinkage cavity (2) that this system comprises a vertically arranged coal dust airduct (1) and is arranged in a coal dust airduct (1), be provided with in the upper end of fixing shrinkage cavity (2) along bore edges upwards gradually by narrow broaden domatic, this is domatic makes upper end of fixing shrinkage cavity (2) form the anti-accumulated powder device (3) of infundibulate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520358887.1U CN204880194U (en) | 2015-05-29 | 2015-05-29 | Not long -pending fixed shrinkage cavity system of powder that tuber pipe of boiler powder process system was arranged perpendicularly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520358887.1U CN204880194U (en) | 2015-05-29 | 2015-05-29 | Not long -pending fixed shrinkage cavity system of powder that tuber pipe of boiler powder process system was arranged perpendicularly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204880194U true CN204880194U (en) | 2015-12-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520358887.1U Active CN204880194U (en) | 2015-05-29 | 2015-05-29 | Not long -pending fixed shrinkage cavity system of powder that tuber pipe of boiler powder process system was arranged perpendicularly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204880194U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864404A (en) * | 2015-05-29 | 2015-08-26 | 国家电网公司 | Pulverized coal accumulation prevention fixing shrinkage cavity device with vertically-arranged primary air pipes for boiler coal pulverizing system |
-
2015
- 2015-05-29 CN CN201520358887.1U patent/CN204880194U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864404A (en) * | 2015-05-29 | 2015-08-26 | 国家电网公司 | Pulverized coal accumulation prevention fixing shrinkage cavity device with vertically-arranged primary air pipes for boiler coal pulverizing system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |