CN202303357U - Square multi-stage stepped air supply and anti-clogging coal drop pipe - Google Patents
Square multi-stage stepped air supply and anti-clogging coal drop pipe Download PDFInfo
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- CN202303357U CN202303357U CN2011203879968U CN201120387996U CN202303357U CN 202303357 U CN202303357 U CN 202303357U CN 2011203879968 U CN2011203879968 U CN 2011203879968U CN 201120387996 U CN201120387996 U CN 201120387996U CN 202303357 U CN202303357 U CN 202303357U
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Abstract
The utility model relates to a coal supply device for a raw coal bin of a boiler, and particularly discloses a square multi-stage stepped air supply and anti-clogging coal drop pipe. The square multi-stage stepped air supply and anti-clogging coal drop pipe includes a coal drop pipe connected with a boiler chamber, wherein a coal spreading air pipe communicated with the boiler chamber is arranged at the bottom of the coal drop pipe. The square multi-stage stepped air supply and anti-clogging coal drop pipe is characterized in that the section of the coal drop pipe is square; the bottom surface of the coal drop pipe is provided with stepped layers from top to bottom; an air supply jacket is arranged between every two layers and communicated with a coal supply air pipe; and nozzles communicated with the coal drop pipe are arranged in the air supply jackets. According to the utility model, a deep analysis on the coal clogging principle of the boiler is carried out, the traditional design concept of the coal drop pipe is changed, and the coal clogging probability of the boiler is greatly reduced after the structural shape and the air distribution system of the coal drop pipe are taken into consideration, therefore, the square multi-stage stepped air supply and anti-clogging coal drop pipe is not only suitable for a coal drop pipe of a coal supply system of a CFB (circulating fluid bed) boiler, but also suitable for conveying systems for other similar materials.
Description
(1) technical field
The utility model relates to boiler run coal bin coal feeder, the anti-chute blockage coal spout of particularly a kind of square multi-stage stepwise air-supply.
(2) background technology
In the numerous subsidiary engines of CFBB (CFB boiler); The boiler coal feeding system is most important, but the coal spout blockage problem that perplexs the CFB stable operation of the boiler is not solved all the time, not only influences boiler safety, stable operation; The more important thing is that having strengthened workman's work moves the capital to another place; The work on the spot environment is not more known where to begin, though boiler maker man and correlative study personnel have carried out corresponding transformation to coal spout, still fails thoroughly to solve the chute blockage problem; Especially work as (general moisture is more than 12%) under the big slightly situation of bunker coal humidity and viscosity, boiler chute blockage problem is even more serious.
Circular configuration is adopted in domestic present CFB boiler coal spout (standpipe, inclined tube) cross section usually, and the wind of delivering coal is together arranged on general coal spout inclined tube top, enters the burner hearth position and arranges coal spread wind one.The CFB boiler of present domestic evaporation capacity below 75t/h is because the lower furnace portion coal dropping port is negative pressure; So coal spout need not airtight, generally adopt manual work in time to patrol and examine and the mediation measure prevents chute blockage, but the CFB boiler of evaporation capacity more than 130t/h; Because the lower furnace portion coal dropping port is malleation; So coal spout must seal, in a single day chute blockage like this takes place, the mediation difficulty is big especially.With certain chemical enterprise 260t/hCFB boiler practical operation situation is example; In case the coal spout inclined tube stops up; Dredge a coal spout and need 2 hours at least; Greatly threaten boiler safety, stable operation, along with the deterioration of CFB boiler large scale development and boiler oil ature of coal, boiler chute blockage problem is badly in need of solving.
(3) summary of the invention
The utility model provides a kind of square multi-stage stepwise air-supply simple in structure, that frictional resistance is little to prevent the chute blockage coal spout in order to remedy the deficiency of prior art.
The utility model is realized through following technical scheme:
The anti-chute blockage coal spout of a kind of square multi-stage stepwise air-supply; Comprise the coal spout that connects burner hearth, the coal spout bottom is provided with the coal spread wind pipe that is communicated with burner hearth, and it is characterized in that: said coal spout cross section is square; The stepped from top to bottom stratum in coal spout bottom surface; Be provided with the air-supply chuck between stratum and the stratum, the air-supply chuck is communicated with the airduct of delivering coal, and is provided with the nozzle that is communicated with coal spout in the air-supply chuck.
The utility model combines on-the-spot actual, analyzes and sums up traditional coal spout chute blockage reason, does guidance with rational mechanics and hydrodynamics correlation theory, looks for another way, and on structure, on the air distribution, coal spout is arranged again.
(1) changes the coal spout cross section into square cross
Traditional circular cross-section coal spout bottom is " arc "; Bunker coal is in dropping process, and the coal grain that is attached to the coal spout sidewall is concentrated to coal spout " arc " bottom landing under gravity and the two force action of support force; Certainly will cause " arc " underseam thickness to increase like this; And coal seam and coal spout contact area reduce, and then the suffered coal spout frictional force increase of bunker coal, and the chute blockage probability also increases.And coal spout bottom in square-section is " plane "; Bunker coal can be tiled on the coal spout bottom " plane ", relatively circular cross-section coal spout bottom " arc " in dropping process relatively equably; Square coal spout bottom is bigger with the bunker coal contact area; Coal seam thickness reduces relatively, and then frictional force that bunker coal is received reduces, and the chute blockage probability reduces greatly.
(2) increase the multi-stage stepwise wind structure of delivering coal
The tradition coal spout advances that the burner hearth position is furnished with coal spread wind, the flame-observing hole position is furnished with the wind of delivering coal; Yet wind chuck distance is too short owing to deliver coal; The hot blast diffusion rapidly of coming out from the wind chuck of delivering coal simultaneously, the abatement of wind can not form reliable, continuous " air cushion " anti-chute blockage.The utility model is with coal spout bottom segmentation, layered arrangement, and whole coal spout bottom bunker coal contact-making surface is stepped, is hot blast of jacket structured feeding between stratum and the stratum simultaneously.
The more excellent scheme of the utility model is:
The air-supply chuck size in the stratum reduces gradually from top to bottom on the said coal spout, the distance of nozzle and nozzle diminishes gradually.Air-supply chuck size reduces step by step, is equivalent to increase the JO blast, and purpose is to overcome near the increasingly high characteristics of burner hearth site pressure; This structure wind wind-force that can effectively guarantee to deliver coal, can form reliably simultaneously, continuously " air cushion " prevent chute blockage, the descending track of bunker coal is similar to waveform; Bunker coal every one " the lowest point "; Just to there being one-level to deliver coal wind, it is delivered to " top of the waves ", guaranteed that like this bunker coal does not contact with the coal spout bottom again to its power; Basically eliminate frictional force, greatly reduced the chute blockage probability.
The utility model conducts in-depth analysis from boiler chute blockage principle; Change coal spout traditional design theory; Consider from coal spout planform, cloth wind system; Greatly reduce boiler chute blockage probability, be not only applicable to CFB boiler coal feeding system coal spout, also be applicable to other similar material-transporting systems.
(4) description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the structural representation of traditional coal spout;
Fig. 2 is the schematic cross-section of traditional coal spout;
Fig. 3 is the schematic cross-section of the utility model;
Fig. 4 is the structural representation of the utility model.
Among the figure, 1 burner hearth, 2 coal spouts, 3 coal spread wind pipes, 4 stratum, 5 air-supply chucks, 6 airducts of delivering coal, 7 nozzles.
(5) specific embodiment
Accompanying drawing is a kind of specific embodiment of the utility model.This embodiment comprises the coal spout 2 that connects burner hearth 1; Coal spout 2 bottoms are provided with the coal spread wind pipe 3 that is communicated with burner hearth 1; Said coal spout 2 cross sections are square, and the stepped from top to bottom stratum 4 in coal spout 2 bottom surfaces is provided with air-supply chuck 5 between stratum 4 and the stratum 4; Air-supply chuck 5 is communicated with the airduct 6 of delivering coal, and is provided with the nozzle 7 that is communicated with coal spout 2 in the air-supply chuck 5; Air-supply chuck 5 sizes in the stratum 4 reduce gradually from top to bottom on the said coal spout 2, nozzle 7 diminishes with the distance of nozzle 7 gradually.
The utility model combines on-the-spot actual, analyzes and sums up traditional coal spout chute blockage reason, does guidance with rational mechanics and hydrodynamics correlation theory, looks for another way, and on structure, on the air distribution, coal spout is arranged again.
(1) bunker coal force analysis and traditional coal spout chute blockage mechanism
Can find out that from accompanying drawing 1 traditional coal spout cloth wind structure is generally two-way, is respectively deliver coal wind, coal spread wind; Bunker coal is done force analysis, gravity, support force, resistance are arranged, the thrust of the wind of delivering coal in addition simultaneously; And that gravity, support force, the wind thrust of delivering coal are made a concerted effort is opposite with resistance just, is not difficult to find out that resistance is more little; Be that frictional force is more little good more, bunker coal also is not easy to stop up; Simultaneously, wind is after spout ejection because traditional coal spout is delivered coal, and intensity weakens, and bunker coal is the parabolic shape motion, in coal spout 2 bottoms near burner hearth 1 position, because the wind effect of delivering coal weakens basically, so also strengthened the chute blockage probability.
(2) circular, square-section coal spout force analysis
Can find out that from accompanying drawing 2 and 3 traditional round tee section coal spout sidewall is coal-fired can to slide to zone, coal spout 2 bottoms " arc " under the force action of gravity and support force, cause this subregion coal seam thickness to increase; The also corresponding increase of frictional resistance; And there are not the problems referred to above in the square-section coal spout, and coal spout 2 bottoms are " plane ", and coal-fired distribution is even relatively; Coal seam thickness is thinner relatively, reduces and frictional resistance is also corresponding.
(3) the utility model coal spout
The tradition coal spout is delivered coal the wind chuck apart from too short, the hot blast diffusion rapidly of coming out from the wind chuck of delivering coal simultaneously, and the abatement of wind can not form reliable, continuous " air cushion " anti-chute blockage.Shown in accompanying drawing 4; The utility model coal spout is with coal spout bottom segmentation, layered arrangement; Whole coal spout 2 bottom bunker coal contact-making surfaces are stepped, are hot blast of jacket structured feeding between stratum 4 and the stratum 4 simultaneously, and these air-supply chuck 5 sizes reduce step by step; Purpose is to increase the JO blast; Overcome near the increasingly high characteristics of burner hearth 1 site pressure, chuck nozzle 7 diminishes with nozzle 7 distances step by step, and purpose is to overcome the obstruction that burner hearth 1 regional high-pressure hot wind plays a reversed role to bunker coal to cause coal-fired running orbit horizontal range to shorten.This structure wind wind-force that can effectively guarantee to deliver coal, can form reliably simultaneously, continuously " air cushion " prevent chute blockage.
(4) the coal-fired running orbit of the utility model coal spout
Shown in accompanying drawing 4, set air-supply progression according to the coal spout total length, can guarantee that like this coal-fired undulate falls, can be similar to and regard bunker coal as and the coal spout base plate does not come in contact, and then frictional force can ignore, the chute blockage probability also reduces greatly.
Claims (2)
1. the chute blockage coal spout is prevented in a square multi-stage stepwise air-supply; Comprise the coal spout (2) that connects burner hearth (1); Coal spout (2) bottom is provided with the coal spread wind pipe (3) that is communicated with burner hearth (1); It is characterized in that: said coal spout (2) cross section is square, and the stepped from top to bottom stratum in coal spout (2) bottom surface (4) is provided with air-supply chuck (5) between stratum (4) and the stratum (4); Air-supply chuck (5) is communicated with the airduct of delivering coal (6), is provided with the nozzle (7) that is communicated with coal spout (2) in the air-supply chuck (5).
2. the anti-chute blockage coal spout of square multi-stage stepwise air-supply according to claim 1 is characterized in that: air-supply chuck (5) size in the stratum reduces gradually from top to bottom on the said coal spout (2), the distance of nozzle (7) and nozzle (7) becomes gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203879968U CN202303357U (en) | 2011-10-13 | 2011-10-13 | Square multi-stage stepped air supply and anti-clogging coal drop pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203879968U CN202303357U (en) | 2011-10-13 | 2011-10-13 | Square multi-stage stepped air supply and anti-clogging coal drop pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202303357U true CN202303357U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203879968U Expired - Fee Related CN202303357U (en) | 2011-10-13 | 2011-10-13 | Square multi-stage stepped air supply and anti-clogging coal drop pipe |
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| CN (1) | CN202303357U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453524A (en) * | 2013-09-05 | 2013-12-18 | 无锡华光锅炉股份有限公司 | Rectangular coal feeding pipe for circulating fluidized bed boiler |
| CN106642094A (en) * | 2016-12-14 | 2017-05-10 | 梁春晓 | Nonblocking coal spreading device used for circulating fluidized bed boiler |
| CN112460588A (en) * | 2020-11-16 | 2021-03-09 | 山西昱光发电有限责任公司 | Coal feeding system and method for preventing coal blockage of coal dropping pipe |
-
2011
- 2011-10-13 CN CN2011203879968U patent/CN202303357U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453524A (en) * | 2013-09-05 | 2013-12-18 | 无锡华光锅炉股份有限公司 | Rectangular coal feeding pipe for circulating fluidized bed boiler |
| CN103453524B (en) * | 2013-09-05 | 2016-04-06 | 无锡华光锅炉股份有限公司 | A kind of rectangle coal-feeding tube for CFBB |
| CN106642094A (en) * | 2016-12-14 | 2017-05-10 | 梁春晓 | Nonblocking coal spreading device used for circulating fluidized bed boiler |
| CN112460588A (en) * | 2020-11-16 | 2021-03-09 | 山西昱光发电有限责任公司 | Coal feeding system and method for preventing coal blockage of coal dropping pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20121013 |