CN100552293C - Circulating fluidized bed boiler multiple-point return feeder - Google Patents
Circulating fluidized bed boiler multiple-point return feeder Download PDFInfo
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- CN100552293C CN100552293C CNB2006101140315A CN200610114031A CN100552293C CN 100552293 C CN100552293 C CN 100552293C CN B2006101140315 A CNB2006101140315 A CN B2006101140315A CN 200610114031 A CN200610114031 A CN 200610114031A CN 100552293 C CN100552293 C CN 100552293C
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Abstract
A kind of CFBB high-temperature material of the present invention loop back device can divide multiple spot to send burner hearth back to the high temperature circulation material, alleviates material and concentrates the fluidisation that causes when being recycled to the large tracts of land bed surface and the inhomogeneities of temperature, also has simple expansion characteristics simultaneously; Comprise a vertical descending branch, a vertical ascent stage, a horizontal segment that connects bottom the two, and corresponding air-distribution device, ascent stage top is provided with at least two overfalls that highly equate, and each overfall all has a returning charge section to be attached thereto; The ratio of the cross-sectional area of ascent stage and descending branch 〉=1; Horizontal segment is one to have the vertical cylinder of horizontal symmetry axis; The plane at this symmetry axis and descending branch center line place is the symmetrical plane of circulating fluidized bed boiler multiple-point return feeder; Ascent stage is a vertical cylinder, and the width of its cross section is greater than the degree of depth.
Description
Technical field
The present invention relates to CFBB, particularly a kind of high temperature circulation loopback of material device of CFBB.
Background technology
The loopback of material device is the critical component in the CFBB, and it constitutes the high-temp solid material closed circuit with burner hearth, separator.The major function of loop back device be solid material that temperature is higher continuously, stably be transmitted back to the higher-pressure region from low-pressure area, and prevent the flue gas anti-channeling.
Research at the loopback of material device has been carried out for many years.The on-mechanical valve has been owing to overcome that mechanical valve at high temperature is easy to jam, wearing and tearing, material rate height, shortcoming such as cost an arm and a leg, and obtained using widely.At present, using the most general on-mechanical formula high temperature circulation loopback of material device is the U-shaped material returning device.U-shaped material returning device likeness in form letter " U ", comprise a vertical descending branch, vertical ascent stage, and one section horizontal segment that the two bottom is linked to each other, each section bottom all has the air-distribution device of blast cap or wind-distributing pipe form, in order to feed fluidized wind, ascent stage top also links to each other with a returning charge section by overfall.The high-temperature material that separator is separated enters material returning device from descending branch, enters the ascent stage through horizontal segment, and under the fluidisation wind action, flows out from overfall from bottom to top, flows into the returning charge section, sends burner hearth back to by connecting pipeline section.
Along with Scale-up of Circulating Fluidized Bed Boiler, burner hearth increases gradually, the cross-sectional area of burner hearth is also increasing, and a large amount of recycle stocks are concentrated when the returning charge mouth that equates with number of separators returns burner hearth, and the bed below the returning charge mouth is prone to that fluidisation is inhomogeneous, the also uneven phenomenon of Temperature Distribution.In order to eliminate this inhomogeneities, Chinese invention patent 200410002070.7 has disclosed a kind of circulating fluid bed reactor, and wherein material returning device comprises two returning charge sections, along the circumferencial direction distribution of ascent stage, be mutually 60～180 ° angle, and about material returning device longitudinal axis symmetry.Returning charge mouth quantity on the burner hearth sidewall of this material returning device correspondence is than using conventional material returning device to increase by one times, can alleviate the inhomogeneities of concentrating returning charge to bring on the big bed surface effectively, but this material returning device returning charge section and with the connecting pipe of burner hearth sidewall in can have the many places inclined tube, the expansion design difficulty is bigger, be prone to Expansion sealing and problem on deformation, influence security of operation.
Summary of the invention
The material returning device that the purpose of this invention is to provide a kind of CFBB can divide multiple spot to send burner hearth back to the high temperature circulation material, alleviates material and concentrates the fluidisation that causes when being recycled to the large tracts of land bed surface and the inhomogeneities of temperature; Also has simple expansion characteristics simultaneously.
For achieving the above object, technical scheme of the present invention is:
Circulating fluidized bed boiler multiple-point return feeder, comprise a vertical descending branch, a vertical ascent stage, a horizontal segment that connects bottom the two, and corresponding air-distribution device, ascent stage top is provided with at least two overfalls, the overfall height equates, and each overfall all has a returning charge section to be attached thereto; The ratio of ascent stage and descending branch cross-sectional area 〉=1; Horizontal segment is one to have the vertical cylinder of horizontal symmetry axis; The plane at this symmetry axis and descending branch center line place is the symmetrical plane of circulating fluidized bed boiler multiple-point return feeder; Ascent stage is a vertical cylinder, and the width of its cross section is greater than the degree of depth, and width is the yardstick perpendicular to the material returning device symmetrical plane, and the degree of depth is the yardstick that is parallel to the material returning device symmetrical plane.
Wherein, the ascent stage can be rectangle or oblong cylinder for a cross section.
Above-mentioned circulating fluidized bed boiler multiple-point return feeder, returning charge section center line all is parallel to the material returning device symmetrical plane, and burner hearth is all pointed in outlet downwards; The returning charge section can be two, and symmetrical about the material returning device symmetrical plane; The returning charge section also can be three, and the center line of one of them is positioned on the material returning device symmetrical plane, and all the other two symmetrical about the material returning device symmetrical plane.
Above-mentioned circulating fluidized bed boiler multiple-point return feeder, ascent stage top have two overfalls, are positioned at the two ends of ascent stage cross-sectional width direction, and the centerline of two returning charge sections that link to each other with overfall is in same plane, and about material returning device symmetrical plane symmetry; Ascent stage upper width direction center can also have an overfall, and the returning charge section that center line is positioned on the material returning device symmetrical plane is attached thereto.
Advantage of the present invention is simple in structure, and flexible design can satisfy the specific design needs of CFBB; Ascent stage and returning charge section design flexibly can be avoided oblique expansion, simplifies Expansion sealing, avoids operating distortion and leakage; In large circulating fluidized bed boiler, adopt this multiple-point return feeder to send the high temperature circulation material back to burner hearth as far as possible equably along furnace chamber width, when alleviating material and concentrating on minority returning charge point and send the large tracts of land bed surface back to, the fluidisation that causes and the inhomogeneities of temperature.
Description of drawings
Fig. 1～3rd, the schematic diagram of the embodiment of the invention 1.
Fig. 4 is the application schematic diagram of the embodiment of the invention 1 in CFBB.
Fig. 5～7th, the schematic diagram of the embodiment of the invention 2.
Fig. 8～10th, the schematic diagram of the embodiment of the invention 3.
Figure 11～13rd, the schematic diagram of the embodiment of the invention 4.
The specific embodiment
Be depicted as embodiment 1 as Fig. 1,2,3 and 4, circulating fluidized bed boiler multiple-point return feeder comprises cylindrical 1, one a cuboid ascent stage 3 of descending branch, is connected the horizontal segment 2 of the two bottom with one, and its cross section is similar to isosceles trapezoid; The cross section of ascent stage 3 is a rectangle, and its long limit is perpendicular to horizontal segment 2 horizontal symmetrical direction of principal axis, and the ratio of ascent stages 3 cross-sectional area and descending branch 1 cross-sectional area is 3.6; Comprise that also two 4, two overfalls 31 of two returning charge sections that link to each other respectively with ascent stage 3 tops, two overfalls 31 are highly equal; These two returning charge sections 4 with the material returning device symmetrical plane symmetrically and its center line be parallel to each other, burner hearth 10 directions are all pointed in outlet downwards, are communicated with returning charge mouth 101 on the burner hearth 10 by connecting pipeline section 5.
Be depicted as embodiment 2 as Fig. 5,6 and 7, circulating fluidized bed boiler multiple-point return feeder comprises cylindrical 1, one a cuboid ascent stage 3 of descending branch, is connected the horizontal segment 2 of the two bottom with one, and its cross section is similar to isosceles trapezoid; The cross section of ascent stage 3 is a rectangle, and its long limit is perpendicular to horizontal segment 2 horizontal symmetrical direction of principal axis, and the ratio of ascent stages 3 cross-sectional area and descending branch 1 cross-sectional area is 2; Also comprise three returning charge sections 4 that link to each other with ascent stages 3 top overfall 31, its center line is parallel to each other, and burner hearth 10 is all pointed in outlet; The center line of one of them returning charge section 4 is positioned on the material returning device symmetrical plane, and all the other two symmetrical with the material returning device symmetrical plane; Three overfalls 31 are highly equal.
Be depicted as embodiment 3 as Fig. 8,9 and 10, circulating fluidized bed boiler multiple-point return feeder comprises cylindrical 1, one a cylindricality ascent stage 3 of descending branch, is connected the horizontal segment 2 near cuboid of the two bottom with one; The cross section of ascent stage 3 is a Long Circle, and its long limit is perpendicular to the material returning device symmetrical plane, and the ratio of ascent stage 3 and descending branch 1 cross-sectional area is 1; Ascent stages 3 top has two overfalls 31, and it is positioned at the two ends of ascent stage 3 cross-sectional width directions, i.e. two button-head places; The centerline of two returning charge sections 4 that link to each other with overfall 31 is in same plane, and with material returning device symmetrical plane symmetry, two opposite directions are pointed in outlet downwards respectively, is communicated with returning charge mouth 101 on the burner hearth 10 by connecting pipeline section 5.
In order to simplify the expansion characteristics that is connected pipeline section 5 between material returning device and the burner hearth 10, connecting pipeline section 5, to be generally the pipeline section that a series of center lines are positioned at same plane perpendicular to furnace wall (generally be two sections parallel downward-sloping pipeline sections, link to each other with one section pipeline section straight down), connect the returning charge mouth 101 of material returning device returning charge section 4 and burner hearth 10.Like this, the distance between two returning charge mouths 101 just directly is decided by distance between 4 outlets of two returning charge sections on burner hearth 10 sidewalls.This returning charge section 4 is located at the design at ascent stages 3 two ends, can adapt to the different spacing between the returning charge mouth 101 by regulating the length of returning charge section 4.
Be depicted as embodiment 4 as Figure 11,12 and 13, circulating fluidized bed boiler multiple-point return feeder comprises cylindrical 1, one a cylindricality ascent stage 3 of descending branch, is connected the horizontal segment 2 of the two bottom with one; The cross section of ascent stage 3 is a Long Circle, and its long limit is perpendicular to horizontal segment 2 horizontal symmetrical direction of principal axis, and the ratio of ascent stages 3 cross-sectional area and descending branch 1 cross-sectional area is 3; Also comprise three returning charge sections 4 that link to each other with three overfalls 31 in ascent stages 3 top respectively, wherein two returning charge sections 4 are positioned at the two ends of ascent stage 3 cross-sectional width directions, the centerline of two returning charge sections 4 that should link to each other with overfall 31 is in same plane, and with material returning device symmetrical plane symmetry; The 3rd returning charge section 4 center lines are positioned on the material returning device symmetrical plane, and diameter equates with preceding two; Three overfalls 31 highly also equate.
Claims (7)
1, a kind of circulating fluidized bed boiler multiple-point return feeder comprises a vertical descending branch (1), a vertical ascent stage (3), a horizontal segment (2) that connects bottom the two, and corresponding air-distribution device, it is characterized in that:
A), ascent stage (3) top is provided with at least two overfalls (31), overfall (31) is highly equal, and each overfall (31) all has a returning charge section (4) to be attached thereto;
B), ratio 〉=1 of ascent stage (3) and descending branch (1) cross-sectional area;
C), horizontal segment (2) is one to have the vertical cylinder of horizontal symmetry axis; The plane at this symmetry axis and descending branch (1) center line place is the symmetrical plane of circulating fluidized bed boiler multiple-point return feeder;
D), the ascent stage (3) is a vertical cylinder, the width of its cross section is greater than the degree of depth, width is the yardstick perpendicular to the material returning device symmetrical plane, the degree of depth is the yardstick that is parallel to the material returning device symmetrical plane.
2, by the described circulating fluidized bed boiler multiple-point return feeder of claim 1, it is characterized in that the described ascent stage (3) is that a cross section is rectangle or oblong cylinder.
3, by the described circulating fluidized bed boiler multiple-point return feeder of claim 1, it is characterized in that described returning charge section (4) center line all is parallel to the material returning device symmetrical plane, and burner hearth (10) is all pointed in outlet downwards.
4, by the described circulating fluidized bed boiler multiple-point return feeder of claim 3, it is characterized in that described returning charge section (4) is two, and symmetrical about the material returning device symmetrical plane.
5, by the described circulating fluidized bed boiler multiple-point return feeder of claim 1, it is characterized in that described returning charge section (4) is three, the center line of one of them is positioned on the material returning device symmetrical plane, and all the other two symmetrical about the material returning device symmetrical plane.
6, by claim 1 or 2 described circulating fluidized bed boiler multiple-point return feeders, it is characterized in that, (3) top of described ascent stage has two overfalls (31), be positioned at the two ends of ascent stage (3) cross-sectional width direction, the centerline of two the returning charge sections (4) that link to each other with two overfalls (31) is in same plane, and about material returning device symmetrical plane symmetry.
7, by claim 1 or 2 described circulating fluidized bed boiler multiple-point return feeders, it is characterized in that, (3) top of described ascent stage has three overfalls (31), wherein, two two ends that are positioned at ascent stage (3) cross-sectional width direction, the centerline of two the returning charge sections (4) that link to each other with two overfalls (31) that are positioned at ascent stage (3) cross-sectional width direction two ends is in same plane, and with material returning device symmetrical plane symmetry; Ascent stage (3) cross-sectional width direction center also has an overfall (31), and the returning charge section (4) that center line is positioned on the material returning device symmetrical plane is attached thereto.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101140315A CN100552293C (en) | 2006-10-25 | 2006-10-25 | Circulating fluidized bed boiler multiple-point return feeder |
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| CNB2006101140315A CN100552293C (en) | 2006-10-25 | 2006-10-25 | Circulating fluidized bed boiler multiple-point return feeder |
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| CN100552293C true CN100552293C (en) | 2009-10-21 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI122040B (en) * | 2009-11-10 | 2011-07-29 | Foster Wheeler Energia Oy | Process and arrangement for feeding fuel into a boiler with circulating fluidized beds |
| CN201606863U (en) * | 2009-12-09 | 2010-10-13 | 上海锅炉厂有限公司 | Support structure capable of freely expanding material returning device and material returning legs |
| CN103041748B (en) * | 2012-10-18 | 2015-03-11 | 东南大学 | Device and method for carrying out temperature reduction and pressure reduction on high-temperature and high-pressure solid particles |
| CN105444163B (en) * | 2014-09-30 | 2017-09-29 | 中国科学院工程热物理研究所 | Ultralow volatile matter superfine fuel burning device of circulating fluidized bed and combustion method |
| CN104696951B (en) * | 2015-01-28 | 2017-01-11 | 中国神华能源股份有限公司 | Boiler-in integrated coupled desulfurization and denitrification method for circulating fluidized bed boiler |
| CN111054272B (en) * | 2018-10-17 | 2022-07-12 | 中国石油化工股份有限公司 | Fluidized bed gasification reaction apparatus and method |
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| US6631698B1 (en) * | 1999-11-10 | 2003-10-14 | Foster Wheeler Energia Oy | Circulating fluidized bed reactor |
| CN2593064Y (en) * | 2002-12-17 | 2003-12-17 | 重庆市节能技术服务中心 | Boiler primary air pressurized dense-phase zone charge returning apparatus |
| JP2004169994A (en) * | 2002-11-20 | 2004-06-17 | Hitachi Zosen Corp | Combustion method for waste material such as meat scrap |
| CN1590843A (en) * | 2003-01-10 | 2005-03-09 | 阿尔斯托姆动力锅炉有限公司 | Circulating fluidized bed reactor |
| JP2005300077A (en) * | 2004-04-14 | 2005-10-27 | Mitsubishi Heavy Ind Ltd | Circulating fluidized bed furnace |
| CN2747467Y (en) * | 2004-11-11 | 2005-12-21 | 华中科技大学 | Fluidised sealed material return device |
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2006
- 2006-10-25 CN CNB2006101140315A patent/CN100552293C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6631698B1 (en) * | 1999-11-10 | 2003-10-14 | Foster Wheeler Energia Oy | Circulating fluidized bed reactor |
| JP2004169994A (en) * | 2002-11-20 | 2004-06-17 | Hitachi Zosen Corp | Combustion method for waste material such as meat scrap |
| CN2593064Y (en) * | 2002-12-17 | 2003-12-17 | 重庆市节能技术服务中心 | Boiler primary air pressurized dense-phase zone charge returning apparatus |
| CN1590843A (en) * | 2003-01-10 | 2005-03-09 | 阿尔斯托姆动力锅炉有限公司 | Circulating fluidized bed reactor |
| JP2005300077A (en) * | 2004-04-14 | 2005-10-27 | Mitsubishi Heavy Ind Ltd | Circulating fluidized bed furnace |
| CN2747467Y (en) * | 2004-11-11 | 2005-12-21 | 华中科技大学 | Fluidised sealed material return device |
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