CN2158036Y - Ultra-high covering rate " " shape back arch for grate-fired furnace - Google Patents
Ultra-high covering rate " " shape back arch for grate-fired furnace Download PDFInfo
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- CN2158036Y CN2158036Y CN 93206755 CN93206755U CN2158036Y CN 2158036 Y CN2158036 Y CN 2158036Y CN 93206755 CN93206755 CN 93206755 CN 93206755 U CN93206755 U CN 93206755U CN 2158036 Y CN2158036 Y CN 2158036Y
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Abstract
The utility model relates to an ultra-high covering rate back arch which is in the shape of the Chinese character 'ji' for grate firing furnaces, which belongs to the technical field of industrial boiler grate firing equipment in thermal energy engineering. The back arch is connected into a shape like the Chinese character 'ji' orderly by an inclined in a reverse manner (downwards inclined) vertical line outlet arced section, a straight line capacity increasing arced section or an arced capacity increasing arced section and an upwards inclined straight line diffusing arched section. Te middle front part of the back arch has large under arch volumetric capacity capable of holding volatilizing components and causes cokes to sufficiently combust. Positive pressure phenomenon caused by choked smokes does not happen in the arch. The arch having the structure not only can stably fill high-temperature smokes at the rear part of a fire grate in a front arch region and orderly discharge the smokes out of the arch region but also can form eddy flow of the smokes in the front arch region and between the front and the rear arch regions.
Description
The utility model grate furnace superelevation coverage rate " several " font rear arch is to belong to Industrial Boiler grate firing equipment in the Thermal Power Engineering technical field.
Chimney arch plays in class mobile layer burners such as chain furnace effects such as the mixing of the igniting of new coal, inner flue gas of the stove and the short combustions of insulation.It acts on great in this class grate furnace, is the critical component in the stove.In the last few years, industrial boilers in China descended with the ature of coal amount, and kind is changeable, in the boiler combustion new coal ignite and the after-flame of slag becomes key.In the case, the effect of chimney arch seems very outstanding.And constantly study the shape and size of improving rear arch, and burning of coal and after-flame there are very big influence, boiler improves and the important subject of development naturally it also just becomes.
Before the utility model, in the improvement of chimney arch shape, there are " people " font rear arch (patent No. 872143902) and " vertically hogging " (patent No. 90215494) to come out in the recent period.They are a kind of breakthroughs to the transformation development of chimney arch shape, have played certain effect.But in use still there is certain problem." people " font rear arch is easy to generate the arch vexed plug in district and emits malleation when high coverage rate.Vertically hogging has solved the problem that high coverage rate " people " font rear arch emits malleation, but make flue gas effectively enter the face arch district, the function aspects that forms the flue gas vortex there is again not as good as " people " font arch, particularly be positioned at " the tongue arch " of the port of export, it should be a kind of fit structure, it is installed on other suitable arch form, with further increase rear arch coverage rate, reaches the purpose that further reinforcement is ignited.
The purpose of this utility model is in order to get rid of the critical defect of old-fashioned traditional rear arch, overcome recently the deficiency of some arch forms that occur, adopt " several " font rear arch, reach further reinforcement and ignite and mix, so that more effectively enlarge coal accommodation, improve combustion intensity and efficient.Therefore, the utility model is had any different in prior art.
The utility model is by following conceptual design.
A kind of grate furnace superelevation coverage rate " several " font rear arch, form by outlet section, increase-volume section and diffuser, wherein outlet section is that counter (having a down dip) straight line outlet of inclining is encircleed section and the sharp edge outlet is arranged, the increase-volume section is straight line increase-volume arch section or arc increase-volume arch section, diffuser is a straight line diffusion arch section, and 3 arch sections are connected to " several " font successively in the upper end.At the fire grate afterbody, because that burning stops, need not is air-supplied, thereby require minimum sagitta, bleed from afterbody to reduce cool ambient air.Along with flue gas flows forward, enter the after-flame and the combustion zone of coke.Because air constantly infeeds, mobile exhaust gas volumn increases gradually, and therefore requiring flow area is that sagitta constantly increases.The principle with flow of flue gas according to burning has designed updip straight line diffusion arch section.Stage casing increase-volume section adopts little updip or little straight line arch or arc arch of having a down dip, can cause volume under the maximum arch under the identical rear arch total height like this, adopt the only low open height that goes out again, just can make the middle front part of this rear arch have volume under the bigger arch, can hold the abundant burning of volatile matter and coke, become arch internal combustion space relatively independent, that establish one's own system.Adopting superelevation coverage rate (overlength) part volatile combustion district is entered under the situation of rear arch like this, also can not produce the vexed plug of flue gas in the arch and emit malleation.On this basis, this rear arch adopts superelevation coverage rate (coverage rate reaches about 70%) and the anti-straight line outlet arch section of inclining, the reasonable combination of sharp edge outlet, the high-temperature flue gas of fire grate postmedian stably can not only be injected face arch district and the smooth in good order arch district that discharges, and can also between face arch district and front and back arch, distinguish the vortex motion that forms flue gas.This mobile general layout can produce following excellent results: fully increase the time of staying of high-temperature flue gas in the face arch district; Increase the degree of filling of flame greatly, thereby improve the interior temperature of stove of ignition zone and combustion zone significantly; Strengthen the mixing of the flue gas and the rear portion oxygen enrichment flue gas of anterior rich combustible gas effectively.Ignite, guarantee the after-flame of fuel gas in the flue gas like this for reinforcement, promote sedimentation and the after-flame of flying dust in stove, the after-flame of strengthening coke is all very favourable, thereby reaches the purpose that enlarges coal accommodation effectively, improves combustion intensity and efficient.
The utility model as with vertical hogging (patent No. 90215494) in be arranged in the rear arch port of export ligulate arch head be used, then coverage rate also can increase to some extent, effect is better.
The utility model also can have the embodiment of following structural shape according to the difference of service condition, i.e. straight line increase-volume arch section can be little updip straight line increase-volume arch section (7) (figure-2) or little straight line increase-volume arch section (8) that has a down dip; Diffuser can be updip straight line diffusion arch section (3) or horizontal linear diffusion arch section (10).
Fig. 1 (having a down dip) straight line outlet arch section schematic diagram that inclines for the utility model is counter.
Fig. 2 is the little updip straight line of a utility model increase-volume arch section schematic diagram.
Fig. 3 is the little straight line increase-volume arch section schematic diagram that has a down dip of the utility model.
Fig. 4 is the utility model arc straight line increase-volume arch section schematic diagram.
Fig. 5 is the utility model horizontal linear diffusion arch section schematic diagram.
Wherein, (having a down dip) straight line outlet arch section of inclining that (1) is counter; (2) straight line increase-volume arch section; (3) straight line diffusion arch section; (4) face arch; (5) stove plate; (6) sharp edge outlet; (7) little updip straight line increase-volume arch section; (8) little straight line increase-volume arch section that has a down dip; (9) arc increase-volume arch section; (10) horizontal linear diffusion arch section.
Claims (5)
1, a kind of grate furnace superelevation coverage rate " several " font rear arch, form by outlet section, increase-volume section and diffuser, it is characterized in that outlet section is that counter (having a down dip) straight line outlet of inclining is encircleed section (1) and sharp edge outlet (6) is arranged, the increase-volume section is straight line increase-volume arch section (2) or arc increase-volume arch section (9), diffuser is a straight line diffusion arch section (3), and 3 arch sections are connected to " several " font successively in the upper end.
2, " several " according to claim 1 font rear arch is characterized in that straight line increase-volume arch section also can make little updip straight line increase-volume arch section (7).
3, " several " according to claim 1 font rear arch is characterized in that diffuser can make updip straight line diffusion arch section (3).
4, " several " according to claim 1 font rear arch is characterized in that straight line increase-volume arch section also can be made into little straight line increase-volume arch section (8) that has a down dip.
5, " several " according to claim 1 font rear arch is characterized in that diffuser also can make horizontal linear diffusion arch section (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93206755 CN2158036Y (en) | 1993-03-25 | 1993-03-25 | Ultra-high covering rate " " shape back arch for grate-fired furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93206755 CN2158036Y (en) | 1993-03-25 | 1993-03-25 | Ultra-high covering rate " " shape back arch for grate-fired furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2158036Y true CN2158036Y (en) | 1994-03-02 |
Family
ID=33789683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93206755 Expired - Fee Related CN2158036Y (en) | 1993-03-25 | 1993-03-25 | Ultra-high covering rate " " shape back arch for grate-fired furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2158036Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032870A (en) * | 2012-12-20 | 2013-04-10 | 北京中煤神州节能环保技术开发有限公司 | Small-wave flame disturbance extension combustion device |
-
1993
- 1993-03-25 CN CN 93206755 patent/CN2158036Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032870A (en) * | 2012-12-20 | 2013-04-10 | 北京中煤神州节能环保技术开发有限公司 | Small-wave flame disturbance extension combustion device |
| CN103032870B (en) * | 2012-12-20 | 2017-02-08 | 北京中煤神州节能环保技术开发有限公司 | Small-wave flame disturbance extension combustion device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |