CN102635854A - Large-scale circulating fluid bed boiler with buffering bed - Google Patents
Large-scale circulating fluid bed boiler with buffering bed Download PDFInfo
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- CN102635854A CN102635854A CN2012101238639A CN201210123863A CN102635854A CN 102635854 A CN102635854 A CN 102635854A CN 2012101238639 A CN2012101238639 A CN 2012101238639A CN 201210123863 A CN201210123863 A CN 201210123863A CN 102635854 A CN102635854 A CN 102635854A
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Abstract
The invention relates to a large-scale circulating fluid bed boiler with a buffering bed, and relates to a structural design of the circulating fluid bed boiler. The circulating fluid bed boiler provided by the invention is provided with two hearths which are adjacently arranged in parallel, the upper parts of two hearths are completely separated, and the lower parts of the two hearths are communicated through the buffering bed; the buffering bed consists of a buffering bed top, a buffering bed front wall and a material channel formed by front and rear walls of the buffering bed and a buffering bed grid plate, the buffering bed is formed by extending and expanding two-side hearths, the structure is simple, and the buffering bed is of a membrane wall structure; materials in the lower parts of the two-side hearths transversely flow through the buffering bed, the concentration distribution uniformity and the of the temperature distribution uniformity of the materials in the two-side hearths are improved; the upper parts of the hearths are completely separated, so that extended heating surfaces such as airfoil-shaped walls and the like are conveniently distributed in the hearths; the water cooled wall heating condition at the periphery of each hearth is coincident, the water power security of the boiler is improved. The bed pressure on the two-side hearths of the boiler is self-balancing through the buffering, a ' bed turning' phenomenon is basically eliminated, and the operational security of the boiler is improved.
Description
Technical field
The present invention relates to a kind of CFBB, the large circulating fluidized bed boiler that particularly a kind of separator bilateral symmetry is arranged.
Background technology
Along with the continuous development of Combustion technology of circulating fluidized, the CFBB capacity is also in continuous increase, and the furnace(heat) liberation volume increases sooner than the stove internal heating surface is long-pending, needs to arrange more heating surface in the burner hearth.And with the increase of boiler capacity, furnace cross-sectional area is also increasing, and the secondary wind penetration capacity is limited, and the burner hearth center is prone to form oxygen-depleted zone; The air distribution plate area also increases thereupon in addition, and the even fluidisation difficulty of material strengthens in the bed, and the emulsion zone bed is prone to local overtemperature coking.
For overcoming the above problems, in large circulating fluidized bed boiler, extensively adopt pants leg split chamber design.Lower furnace portion is divided into two emulsion zones, and correspondingly, air distribution plate also is divided into two parts, has dwindled the area of single air distribution plate, can guarantee the even fluidisation of an interior material; Pants leg interior wall is arranged overfiren air port, guarantees the secondary wind penetrability good to material.Pants leg split burner hearth is symmetrical fully on two leg structure patterns, but the difference of the air distribution plate of two supporting legs and bed of material drag characteristic in service is added reasons such as primary air flow, coal-supplying amount, causes two supporting legs bed pressure reduction to occur.Bed is pressed big more, and upper furnace pressure is low more, is not having under extraneous the intervention; The bed material flows from top towards the little supporting leg of pressure; A pressure reduction is further increased, finally cause the bed material in the side leg all to blow to the opposite side supporting leg, just produce so-called " tilting table " phenomenon." tilting table " makes the bed material in the side leg lose fluidisation, causes the burner hearth coking, the stable operation of serious threat boiler safety.In boiler operatiopn, drop into the appearance that meticulous automatic control can prevent " tilting table " phenomenon preferably, but can not fundamentally eliminate " tilting table " phenomenon.
Summary of the invention
The object of the invention just is fundamentally to solve " tilting table " problem that present large circulating fluidized bed boiler exists, and a kind of large circulating fluidized bed boiler rational in infrastructure is provided.
Technical scheme of the present invention is following:
A kind ofly comprise that with buffer bed large circulating fluidized bed boiler first burner hearth that adjacent parallel arranges, second burner hearth, cyclone separator and at least one are buffer bed, buffer bedly in the middle of first burner hearth and second burner hearth, evenly be provided with along depth direction; Cyclone separator is arranged symmetrically in the outside of two burner hearths, and first burner hearth and second upper furnace are separated fully, and the bottom emulsion zone is connected through buffer bed; Said buffer bed be the material channel that constitutes by buffer bed top, buffer bed front wall and buffer bed front-back wall and buffer bed air distribution plate; Described buffer bed air distribution plate, buffer bed top, buffer bed front wall and buffer bed back wall are film water cold wall structure; Described buffer bed inwall is laid with refractory material.
Described buffer bed bottom is provided with buffer bed front wall header and buffer bed back wall header, and buffer bed front wall header links to each other with buffer bed front wall, and buffer bed back wall header links to each other with buffer bed back wall.
The air distribution plate of the described buffer bed air distribution plate and first burner hearth or second burner hearth is in sustained height; Described buffer bed air distribution plate is extended respectively by the first burner hearth air distribution plate and the second burner hearth air distribution plate and forms, or being bent into horizontal plane by described buffer bed front wall or buffer bed back wall forms.
Described buffer bed front wall and buffer bed back wall all are parallel to the first burner hearth front wall; Buffer bed front water wall pipe and buffer bed rear water wall pipe near the first burner hearth inside wall are bent to buffer bed heights of roofs along the first burner hearth inside wall water screen tube direction; Buffer bed front water wall pipe and buffer bed rear water wall pipe near the second burner hearth inside wall are bent to buffer bed heights of roofs along the second burner hearth inside wall water screen tube direction; At sustained height; Buffer bed front water wall tube pitch equates that buffer bed rear water wall tube pitch equates; In buffer bed heights of roofs; Buffer bed front water wall pipe is bent into horizontal direction again, and keeps the angle of every water screen tube and buffer bed front wall to be θ, extends to the part that plane, first burner hearth inside wall place forms buffer bed top; Extend to the water screen tube on plane, first burner hearth inside wall place; Up along first burner hearth inside wall water screen tube direction bending again, form the part of the first burner hearth inside wall, wherein tan θ=b/a; A is the spacing of the first burner hearth inside wall and the second burner hearth inside wall on the buffer bed heights of roofs, and b is the distance between the buffer bed front-back wall on the punch press heights of roofs; Buffer bed rear water wall pipe bending mode is identical with the bending mode of buffer bed front water wall pipe, and buffer bed rear water wall pipe bending back forms the another part on buffer bed top, forms the part of the second burner hearth inside wall afterwards again.
The present invention compared with prior art; Have the following advantages and the high-lighting effect: the present invention is provided with two burner hearths of buffer bed connection at the lower furnace portion emulsion zone; When having bed pressure reduction in the burner hearth of boiler both sides, the bed material of fluidisation from the less bigger side of a wing furnace thorax feed pressure of pressure, has rebulid pressure balance through buffer bed; Fundamentally eliminate " tilting table " phenomenon, improved the security of boiler operatiopn.The blast cap of buffer bed lower disposed makes buffer bed interior material fluidisation well, strengthens the lateral flow of both sides lower furnace portion material, has improved the uniformity of material concentration distribution, Temperature Distribution in the burner hearth of both sides.The both sides upper furnace is separated fully; And it is separated by a distance; Compare with the boiler of band water-cooled partition wall design in the middle of the pants leg split burner hearth; The water-cooling wall situation of being heated is more consistent around the burner hearth, and the interior working medium of water-cooling wall is heated more even, helps improving the security of supercritical circulating fluidized bed boiler hydrodynamic force.The both sides upper furnace is separated extended surfaces such as also being convenient in burner hearth, arrange the aerofoil profile wall fully.
Description of drawings
Fig. 1 is the structural representation with buffer bed large circulating fluidized bed boiler provided by the invention (having two buffer bed embodiment).
Fig. 2 is the A-A view of Fig. 1.
Fig. 3 is the B-B view of Fig. 1.
Fig. 4 be the C of Fig. 1 to view, promptly buffer bed roof construction sketch map.
Fig. 5 be the D of Fig. 2 to view, promptly buffer bed front wall structural representation.
Among the figure: 1-first burner hearth; 2-second burner hearth; 3-is buffer bed; The 4-cyclone separator; The 5-first burner hearth air distribution plate; The 6-second burner hearth air distribution plate; The buffer bed air distribution plate of 7-; The buffer bed top of 8-; The 9-first burner hearth air compartment; The buffer bed air compartment of 10-; The 11-second burner hearth air compartment; The 12-first burner hearth external wall; Wall behind 13-first burner hearth; Wall behind 14-second burner hearth; The 15-second burner hearth external wall; The 16-second burner hearth front wall; The 17-first burner hearth front wall; The 18-first burner hearth inside wall; The 19-second burner hearth inside wall; The buffer bed front wall of 20-; The buffer bed back of 21-wall; The buffer bed front wall header of 22-; The buffer bed back of 22-wall header.
The specific embodiment
Below in conjunction with accompanying drawing principle of the present invention, structure and the specific embodiment are done further explanation.Identical all along label representes that components identical perhaps has the element of identical function in the accompanying drawing.Be exemplary through the embodiment that is described with reference to the drawings below.
Fig. 1, Fig. 2 and Fig. 3 are the structural representation with buffer bed large circulating fluidized bed boiler embodiment provided by the invention.This large circulating fluidized bed boiler comprises: first burner hearth 1 that adjacent parallel is arranged, second burner hearth 2, cyclone separator 4 and at least one are buffer bed 3, buffer bedly in the middle of first burner hearth and second burner hearth, evenly are provided with along depth direction; Cyclone separator is arranged symmetrically in the outside of two burner hearths, and separate fully on first burner hearth 1 and second burner hearth, 2 tops, and the bottom emulsion zone is connected through buffer bed 3.Buffer bed 3 is the material channels that are made up of buffer bed top 8, buffer bed front wall 20 and buffer bed front-back wall 21 and buffer bed air distribution plate 7; Buffer bed air distribution plate 7, buffer bed top 8, buffer bed front wall 20 and buffer bed back wall 21 are film water cold wall structure, and inwall is laid with refractory material.When having bed pressure reduction in the burner hearth of boiler both sides, the bed material of fluidisation is realized the pressure self-balancing, fundamentally elimination " tilting table " phenomenon through buffer bed 3 from the less bigger side of a wing furnace thorax feed pressure of pressure; The bed material carries out lateral flow through buffer bed 3 simultaneously, has improved the uniformity of material concentration distribution, Temperature Distribution in the burner hearth of both sides.
Buffer bed bottom is provided with buffer bed front wall header 22 and buffer bed back wall header 23, and buffer bed front wall header 22 links to each other with buffer bed front wall 20, and buffer bed back wall header 23 links to each other with buffer bed back wall 21.
The air distribution plate of buffer bed air distribution plate 7 and first burner hearth 1 or second burner hearth 2 is in sustained height; Buffer bed air distribution plate is extended respectively by the first burner hearth air distribution plate 5 and the second burner hearth air distribution plate 6 and forms, or being bent into horizontal plane by buffer bed front wall 20 or buffer bed back wall 21 forms, and is as shown in Figure 3.
Fig. 4 and Fig. 5 are respectively buffer bed roof construction sketch map and buffer bed front wall structural representation.Buffer bed front wall 20 all is parallel to the first burner hearth front wall 17 with buffer bed back wall 21.Buffer bed front water wall pipe and buffer bed rear water wall pipe near the first burner hearth inside wall 18 are bent to buffer bed heights of roofs along the first burner hearth inside wall water screen tube direction; Buffer bed front water wall pipe and buffer bed rear water wall pipe near the second burner hearth inside wall 19 are bent to buffer bed heights of roofs along the second burner hearth inside wall water screen tube direction; At sustained height; Buffer bed front water wall tube pitch equates that buffer bed rear water wall tube pitch equates; 8 height on buffer bed top; Buffer bed front wall 20 water screen tubes are bent into horizontal direction again, and keep the angle of every water screen tube and buffer bed front wall 20 to be θ, extend to the part that plane, the first burner hearth inside wall, 18 place forms buffer bed top 8; Extend to the water screen tube on plane, the first burner hearth inside wall, 18 place; Up along first burner hearth inside wall water screen tube direction bending again, form the part of the first burner hearth inside wall 18, wherein tan θ=b/a; A is the spacing of the first burner hearth inside wall and the second burner hearth inside wall on 8 height of buffer bed top, and b is that punch press pushes up the distance between the buffer bed front-back wall on 8 height.8 height on buffer bed top; Buffer bed back wall 21 water screen tubes are bent into horizontal direction again, and keep the angle of every water screen tube and buffer bed back wall 21 to be θ, extend to another part that plane, the second burner hearth inside wall, 19 place forms buffer bed top 8; Extend to the water screen tube on plane, the second burner hearth inside wall, 19 place; Up along second burner hearth inside wall water screen tube direction bending again, form the part of the second burner hearth inside wall 19, wherein the θ definition is consistent with preamble.The buffer bed front wall 20 that forms thus, buffer bed back wall 21 and buffer bed top 8 can be regarded the extension and the expansion of the first burner hearth inside wall 18 and the second burner hearth inside wall 19 as, and generation type is reasonable, and is simple in structure.
Claims (5)
1. one kind with buffer bed large circulating fluidized bed boiler; It is characterized in that: said large circulating fluidized bed boiler comprises first burner hearth (1), second burner hearth (2), the cyclone separator (4) and at least one buffer bed (3) that adjacent parallel is arranged, buffer bedly evenly is provided with along depth direction at first burner hearth and second burner hearth centre; Described cyclone separator is arranged symmetrically in the outside of two burner hearths; Separate fully on described first burner hearth (1) and second burner hearth (2) top; The bottom emulsion zone is connected through buffer bed (3), and said buffer bed (3) are the material channels that is made up of buffer bed top (8), buffer bed front wall (20) and buffer bed front-back wall (21) and buffer bed air distribution plate (7); Described buffer bed air distribution plate (7), buffer bed top (8), buffer bed front wall (20) and buffer bed back wall (21) are film water cold wall structure.
2. described a kind of with buffer bed large circulating fluidized bed boiler according to claim 1; It is characterized in that: buffer bed bottom is provided with buffer bed front wall header (22) and buffer bed back wall header (23); Described buffer bed front wall header (22) links to each other with buffer bed front wall (20), and buffer bed back wall header (23) links to each other with buffer bed back wall (21).
3. according to claim 1 or 2 described a kind of with buffer bed large circulating fluidized bed boiler, it is characterized in that: described buffer bed air distribution plate (7) is in sustained height with the air distribution plate of first burner hearth (5) or second burner hearth (6); Described buffer bed air distribution plate is extended respectively by the first burner hearth air distribution plate (5) and the second burner hearth air distribution plate (6) and forms, or being bent into horizontal plane by described buffer bed front wall (20) or buffer bed back wall (21) forms.
4. described a kind of with buffer bed large circulating fluidized bed boiler according to claim 3, it is characterized in that: described buffer bed front wall (20) and buffer bed back wall (21) all are parallel to the first burner hearth front wall (17); Buffer bed front water wall pipe and buffer bed rear water wall pipe near the first burner hearth inside wall (18) are bent to buffer bed heights of roofs along the first burner hearth inside wall water screen tube direction; Buffer bed front water wall pipe and buffer bed rear water wall pipe near the second burner hearth inside wall (19) are bent to buffer bed heights of roofs along the second burner hearth inside wall water screen tube direction; At sustained height; Buffer bed front water wall tube pitch equates that buffer bed rear water wall tube pitch equates; In buffer bed heights of roofs; The water screen tube of buffer bed front wall (20) is bent into horizontal direction again, and keeps the angle of every water screen tube and buffer bed front wall (20) to be θ, extends to the part that plane, the first burner hearth inside wall (18) place forms buffer bed top (8); Extend to the water screen tube on plane, the first burner hearth inside wall (18) place; Up along first burner hearth inside wall water screen tube direction bending again, form the part of the first burner hearth inside wall (18), wherein tan θ=b/a; A is the spacing of the first burner hearth inside wall (18) and the second burner hearth inside wall (19) on the height of buffer bed top (8), and b is the distance between the buffer bed front-back wall on (8) height of punch press top; Buffer bed back wall (21) water screen tube bending mode is identical with the bending mode of buffer bed front wall (20) water screen tube; Wall (21) water screen tube bending back, buffer bed back forms the another part on buffer bed top (8), forms the part of the second burner hearth inside wall (19) afterwards again.
5. described a kind of with buffer bed large circulating fluidized bed boiler by claim 1, it is characterized in that: the inwall of described buffer bed (3) is laid with refractory material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210123863.9A CN102635854B (en) | 2012-04-24 | 2012-04-24 | Large-scale circulating fluid bed boiler with buffering bed |
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| CN201210123863.9A CN102635854B (en) | 2012-04-24 | 2012-04-24 | Large-scale circulating fluid bed boiler with buffering bed |
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| CN102635854A true CN102635854A (en) | 2012-08-15 |
| CN102635854B CN102635854B (en) | 2014-11-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344401A (en) * | 2013-08-09 | 2015-02-11 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler hearth with variable-section water cooling column |
| CN105157021A (en) * | 2015-09-15 | 2015-12-16 | 清华大学 | Double-hearth circulating fluidized bed boiler |
| CN105299634A (en) * | 2015-11-25 | 2016-02-03 | 东方电气集团东方锅炉股份有限公司 | Supercritical circulating fluid bed boiler water wall having high flow stability under low load |
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| EP0784186A1 (en) * | 1996-01-13 | 1997-07-16 | LLB Lurgi Lentjes Babcock Energietechnik GmbH | Steam generator with supercharged circulating fluidized bed combustion |
| CN100565006C (en) * | 2003-11-25 | 2009-12-02 | 福斯特能源公司 | Fluidized bed reactor system with exhaust gas plenum |
| CN101818894A (en) * | 2010-04-29 | 2010-09-01 | 清华大学 | Circulating fluidized bed boiler |
| CN201706484U (en) * | 2009-12-25 | 2011-01-12 | 上海发电设备成套设计研究院 | Pressure balance device used between branches of branched circulating fluidized bed boiler |
| CN202008136U (en) * | 2011-03-30 | 2011-10-12 | 河南省电力勘测设计院 | Circulating fluidized bed boiler |
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2012
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Patent Citations (5)
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| EP0784186A1 (en) * | 1996-01-13 | 1997-07-16 | LLB Lurgi Lentjes Babcock Energietechnik GmbH | Steam generator with supercharged circulating fluidized bed combustion |
| CN100565006C (en) * | 2003-11-25 | 2009-12-02 | 福斯特能源公司 | Fluidized bed reactor system with exhaust gas plenum |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344401A (en) * | 2013-08-09 | 2015-02-11 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler hearth with variable-section water cooling column |
| CN104344401B (en) * | 2013-08-09 | 2016-09-14 | 中国科学院工程热物理研究所 | Boiler hearth of circulating fluidized bed with variable cross-section water-cooled column |
| US9599331B2 (en) | 2013-08-09 | 2017-03-21 | Institute Of Engineering Thermophysics, Chinese Academy Of Sciences | Furnace of circulating fluidized bed boiler having variable cross-section water-cooled column |
| CN105157021A (en) * | 2015-09-15 | 2015-12-16 | 清华大学 | Double-hearth circulating fluidized bed boiler |
| CN105299634A (en) * | 2015-11-25 | 2016-02-03 | 东方电气集团东方锅炉股份有限公司 | Supercritical circulating fluid bed boiler water wall having high flow stability under low load |
| CN105299634B (en) * | 2015-11-25 | 2017-07-28 | 东方电气集团东方锅炉股份有限公司 | The supercritical circulating fluidized bed boiler water-cooling wall of high flow stability under underload |
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| CN102635854B (en) | 2014-11-26 |
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