CN103423739B - A kind of Wear-resistance leak-proof slag blast cap with combination core pipe - Google Patents
A kind of Wear-resistance leak-proof slag blast cap with combination core pipe Download PDFInfo
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- CN103423739B CN103423739B CN201310326142.2A CN201310326142A CN103423739B CN 103423739 B CN103423739 B CN 103423739B CN 201310326142 A CN201310326142 A CN 201310326142A CN 103423739 B CN103423739 B CN 103423739B
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Abstract
A kind of Wear-resistance leak-proof slag blast cap with combination core pipe, comprise top have apical pore and bottom have bottom outlet blast cap outer cover and through blast cap outer cover and and its fix combination core pipe, described combination core pipe is by special-shaped plug, Water conservancy diversion core pipe and fixed core pipe connect and compose successively, combination core pipe is fixed through the apical pore of blast cap outer cover and blast cap outer cover by special-shaped plug, passage gaps is left between the outer wall of combination core pipe and the inwall of blast cap outer cover, combination core pipe is closely passed the bottom outlet of blast cap outer cover and is fixed through air distribution plate perforate and air distribution plate by fixed core pipe, Water conservancy diversion core pipe upper side circumferentially has multiple Water conservancy diversion core pipe apertures, blast cap outer cover bottom thickens wall side and circumferentially has multiple downward-sloping blast cap outer cover apertures, the present invention have structure simple, be convenient to processing and manufacturing, be easy to the feature of overhauling and changing.
Description
Technical field
The present invention relates to blast cap of circulating fluidized bed boiler technical field, be specifically related to a kind of Wear-resistance leak-proof slag blast cap with combination core pipe.
Background technology
The Clean Coal Power Generating Technologies wide as a kind of fuel tolerance, load regulation rate is large, pollutant discharge amount is low, CFBB obtains develop rapidly at home and abroad.The safety and economic operation of CFBB is subject to the restriction of many factors, and wherein the important point is exactly need to set up stable Matter Transfer, and the blast cap on air distribution plate is significant for realizing goods fluid.If improper being easy to of blast cap design arrangement causes air compartment to leak the accidents such as slag, fluidisation inequality, bed coking, the CFBB after many operation a period of times all occurred that blast cap wearing and tearing and air compartment leaked slag problem.Have a strong impact on unit after blast cap wearing and tearing normally to run, add repair and maintenance workload and operating cost.During blast cap leakage slag, lime-ash red-hot in a large number can cause the wearing and tearing of air compartment wall after leaking, and blocks air channel and forces shutdown of boiler, impact safety in production time serious.
The kind of the blast cap that CFBB was applied is more, comprises pig tail type blast cap, cylindrical blast cap, wind cap, bell shape blast cap etc. several, and what current large circulating fluidized bed boiler use was maximum is wind cap and bell shape blast cap.
Wind cap generally arranges one or more outlet, and outlet aperture is comparatively large, also has square and inclination shape etc. several according to the difference of exit angle.Wind cap is higher to installation requirement, needs to proofread one by one, otherwise very easily occurs that between blast cap, air-flow impacts the wearing and tearing caused mutually.Wind cap resistance is on the low side, and cloth wind inequality easily leaks slag, and the CFBB of many employing wind caps puts into operation after a period of time and has all been transformed into bell shape blast cap.
Bell shape blast cap is made up of core pipe and outer cover two parts, and blast cap and core pipe are fixed through air distribution plate, and blast cap is positioned at the upper end of core pipe, and blast cap outer cover surrounding has several aperture, can be divided into reverse-flow, embedded etc. several according to structure difference.The subject matter of bell shape blast cap is that service life is short, examine and replace inconvenience, and wearing and tearing easily appear in bell jar top and aperture exit region, and the resistance that there will be after boiler operatiopn a period of time in various degree declines, and leaks the problem such as slag and wearing and tearing aggravation.Trace it to its cause, part bell-type windshield core pipe top is through-hole structure, there is comparatively wide arc gap (such as Chinese utility model patent 200420039280.9 bell nozzle button of recirculating fluidized bed boiler) between through hole and outer cover, when bed pressure and air quantity fluctuation, lime-ash easily flows backwards from top through hole and enters air compartment.Although use outer cover to cover core pipe top through hole (such as Chinese utility model patent 02290985.0 reverse-flow type blast cap) during the design of some blast cap, but affect by factors such as installation, hot operation expansions, still unavoidably produce certain interval, cause the decline of blast cap resistance, off-design operating mode, causes wearing and tearing and leaks slag.
In addition, the fixed form of bell shape blast cap generally has three kinds: (1) utilize own wt to be fixed on by outer cover on core pipe or be supported on the air distribution plate cast bed of material, adopts to fix in this way easily to occur that outer cover comes off in actual motion, and then slag is leaked in aggravation; By welding by under blast cap outer cover along being fixed together with core pipe, this mode can be good at solving outer cover and to come off problem, is easy to construction for newly-built boiler.But be subject to the restriction in blast cap pitch, site operation space etc., being welded and fixed of the examine and replace of later stage blast cap is very difficult, be difficult to ensure construction quality; (3) use the mode be threaded outer cover and core pipe to be fixed together (such as Chinese invention patent application 201010228307.9 annular constant-current hood), because CFBB emulsion zone temperature is very high in actual motion, the easy deformed dilation of screw thread produces inclination and the lifting of blast cap outer cover, also be difficult to dismounting after cold conditions blowing out, be not easy to examine and replace.
Be subject to operation conditions impact and the energy-saving and cost-reducing needs waited, a considerable amount of CFBB needs to undergo technological transformation to blast cap, and it is difficult that existing cap structure form changes adjustment, is not suitable for the boiler technology reform that puts into operation.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide a kind of Wear-resistance leak-proof slag blast cap with combination core pipe, have structure simple, be convenient to processing and manufacturing, be easy to the feature of overhauling and changing.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of Wear-resistance leak-proof slag blast cap with combination core pipe, comprise top have apical pore 10 and bottom have bottom outlet 11 blast cap outer cover 4 and through blast cap outer cover 4 and and its fix combination core pipe 12, described combination core pipe 12 is by special-shaped plug 1, Water conservancy diversion core pipe 2 and fixed core pipe 3 connect and compose successively, combination core pipe 12 is fixed with blast cap outer cover 4 by the apical pore 10 of special-shaped plug 1 through blast cap outer cover 4, passage gaps is left between the outer wall of combination core pipe 12 and the inwall of blast cap outer cover 4, combination core pipe 12 is closely passed the bottom outlet 11 of blast cap outer cover 4 and is fixed through air distribution plate 7 perforate and air distribution plate 7 by fixed core pipe 3, Water conservancy diversion core pipe 2 upper side circumferentially has multiple Water conservancy diversion core pipe apertures 5, blast cap outer cover 4 bottom thickens wall 15 side and circumferentially has multiple downward-sloping blast cap outer cover apertures 6.
Described special-shaped plug 1 comprises special-shaped plug link 16 and special-shaped plug base 17, and special-shaped plug link 16 is circle, rectangle or triangle, and special-shaped plug link 16 outer wall is together with apical pore 10 welded top of blast cap outer cover 4.
Described Water conservancy diversion core pipe 2 bottom is provided with Water conservancy diversion core pipe link 13, and described fixed core pipe 3 top is provided with fixed core pipe link 14, and Water conservancy diversion core pipe 2 is connected by link each other with fixed core pipe 3, and connected mode is for being threaded, welding or cutting ferrule connection.
The row of described Water conservancy diversion core pipe aperture 5 is for arrange along Water conservancy diversion core pipe 2 circumference one, or the two rows or three rows be arranged above and below, and the quantity of often arranging Water conservancy diversion core pipe aperture 5 is 4 ~ 12, and diameter is 3 ~ 15mm, air outlet velocity 30 ~ 60m/s.
Described blast cap outer cover aperture 6 quantity is 6 ~ 20, and blast cap outer cover aperture 6 is downward-sloping is 5 ~ 30 ° with horizontal sextant angle, and shape is circle, rectangle or combination that is circular and rectangle, and equivalent diameter is 8 ~ 20mm, air outlet velocity 20 ~ 50m/s.
The wall thickness of described Water conservancy diversion core pipe 2 and fixed core pipe 3 is 4 ~ 12mm, and blast cap outer cover 4 top wall thickness is 10 ~ 35mm, and the thickness that bottom thickens wall 15 is 20 ~ 45mm.
Described Water conservancy diversion core pipe 2, fixed core pipe 3 and blast cap outer cover 4 all adopt nickel content be 10% ~ 25% high nickel heat-resistance stainless steel manufacture form.
Have fire-resistant abrasion-proof castable 9 between described blast cap outer cover 4 times edges and air distribution plate 7 top, the distance on fire-resistant abrasion-proof castable 9 upper surface and blast cap outer cover 4 times edges is 0 ~ 10mm.
Compared with prior art, the present invention has the following advantages:
1. cap structure is simple, and be convenient to processing and manufacturing, production cost is low;
2. adopt combination core pipe mode, fixed core pipe can not be affected when changing Water conservancy diversion core pipe, be easy to realize modularized design;
3. the fixing point of blast cap outer cover 4 and combination core pipe 12 is on blast cap top, is easy to maintenance, changes conveniently; Because blast cap outer cover 4 is welded together by the special-shaped plug link 16 of blast cap outer cover apical pore 10 with combination core pipe 12, if need to change blast cap outer cover 4, only needing to polish off original pad can carry out.Owing to retightening the position of welding on blast cap top, therefore constructing operation is easy.
4. fluidized wind is from air compartment successively through fixed core pipe 3 and Water conservancy diversion core pipe 2, and after flowing out from Water conservancy diversion core pipe aperture 5, flow direction, from transferring to vertically downward vertically upward, is tilted to flow into burner hearth by blast cap outer cover aperture 6 afterwards again.Because air-flow is through repeatedly turning back, and blast cap outer cover aperture 6 is tilted to down, and particle can not deposit, and bulky grain is also difficult to bleed air compartment from combination core pipe 12, avoids the generation of Lou slag phenomenon.In addition the exit flow due to blast cap outer cover aperture 6 is downward-sloping, fluidisation is more even, decrease the possibility of coking, avoid blast cap the washing away of exit flow each other, alleviate wearing and tearing, meanwhile, the little hole number of blast cap outer cover is many, decrease the throughput by each aperture and momentum, alleviate exit flow and produce blast cap outer cover wear problem to blowing; Optimizing and revising of blast cap resistance can be realized by the quantity of adjustment Water conservancy diversion core pipe aperture 5 and blast cap outer cover aperture 6.
5. pair blast cap outer cover aperture exit region has carried out thickening process, and improve the anti-wear performance of blast cap, extend the service life of blast cap, maintenance cost is low;
6, be applicable to the blast cap transformation of newly-built CFBB and existing CFBB, retrofit work amount is little.
7. be applicable to the blast cap transformation of newly-built CFBB and existing CFBB, retrofit work amount is little.
Accompanying drawing explanation
Fig. 1 is the front view of a kind of application example of the present invention.
Fig. 2 is blast cap cover structure figure of the present invention, wherein: Fig. 2 a is main TV structure figure, Fig. 2 b of blast cap outer cover is blast cap outer cover plan structure figure.
Fig. 3 is combination core duct ligation composition of the present invention.
Fig. 4 is special-shaped stopper structure figure of the present invention, wherein: Fig. 4 a is special-shaped plug link 16 is circular main TV structure figure, the main TV structure figure of Fig. 4 b to be special-shaped plug link 16 be rectangle, Fig. 4 c is special-shaped plug link 16 is leg-of-mutton main TV structure figure, Fig. 4 d is special-shaped plug link 16 is circular plan structure figure, the plan structure figure of Fig. 4 e to be special-shaped plug link 16 be rectangle, Fig. 4 f is special-shaped plug link 16 is leg-of-mutton plan structure figure.
Fig. 5 is Water conservancy diversion core pipe structure chart of the present invention.
Fig. 6 is fixed core duct ligation composition of the present invention.
Fig. 7 is blast cap outer cover small structure figure of the present invention, wherein: the combination blast cap outer cover small structure figure of Fig. 7 a is circular blast cap outer cover small structure figure, Fig. 7 b to be rectangle blast cap outer cover small structure figure, Fig. 7 c be circular and rectangle.
In figure:
1---special-shaped plug 2---Water conservancy diversion core pipe 3---fixed core pipe
4---blast cap outer cover 5---Water conservancy diversion core pipe aperture 6---blast cap outer cover apertures
7---air distribution plate 8---water cooling tube 9---fire-resistant abrasion-proof castables
10---apical pore 11---bottom outlet 12---combination core pipes
13---Water conservancy diversion core pipe link 14---fixed core pipe link 15---thickens wall
16---special-shaped plug link 17---special-shaped plug base
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.
As Fig. 1, shown in Fig. 2 and Fig. 3, a kind of Wear-resistance leak-proof slag blast cap with combination core pipe of the present invention, comprise top have apical pore 10 and bottom have bottom outlet 11 blast cap outer cover 4 and through blast cap outer cover 4 and and its fix combination core pipe 12, described combination core pipe 12 is by special-shaped plug 1, Water conservancy diversion core pipe 2 and fixed core pipe 3 connect and compose successively, combination core pipe 12 is fixed with blast cap outer cover 4 by the apical pore 10 of special-shaped plug 1 through blast cap outer cover 4, passage gaps is left between the outer wall of combination core pipe 12 and the inwall of blast cap outer cover 4, combination core pipe 12 is closely passed the bottom outlet 11 of blast cap outer cover 4 and is fixed through air distribution plate 7 perforate and air distribution plate 7 by fixed core pipe 3, Water conservancy diversion core pipe 2 upper side circumferentially has multiple Water conservancy diversion core pipe apertures 5, blast cap outer cover 4 bottom thickens wall 15 side and circumferentially has multiple downward-sloping blast cap outer cover apertures 6.Have fire-resistant abrasion-proof castable 9 between described blast cap outer cover 4 times edges and air distribution plate 7 top, the distance on fire-resistant abrasion-proof castable 9 upper surface and blast cap outer cover 4 times edges is 0 ~ 10mm.
The row of described Water conservancy diversion core pipe aperture 5 is for arrange along Water conservancy diversion core pipe 2 circumference one, or the two rows or three rows be arranged above and below, and the quantity of often arranging Water conservancy diversion core pipe aperture 5 is 4 ~ 12, and diameter is 3 ~ 15mm, air outlet velocity 30 ~ 60m/s.
The wall thickness of described Water conservancy diversion core pipe 2 and fixed core pipe 3 is 4 ~ 12mm, and blast cap outer cover 4 top wall thickness is 10 ~ 35mm, and the thickness that bottom thickens wall 15 is 20 ~ 45mm.
Described Water conservancy diversion core pipe 2, fixed core pipe 3 and blast cap outer cover 4 all adopt nickel content be 10% ~ 25% high nickel heat-resistance stainless steel manufacture form.
As shown in Figure 4, described special-shaped plug 1 comprises special-shaped plug link 16 and special-shaped plug base 17, and special-shaped plug link 16 is circle, rectangle or triangle, and special-shaped plug link 16 outer wall is together with apical pore 10 welded top of blast cap outer cover 4.
As shown in Figure 5 and Figure 6, described Water conservancy diversion core pipe 2 bottom is provided with Water conservancy diversion core pipe link 13, described fixed core pipe 3 top is provided with fixed core pipe link 14, and Water conservancy diversion core pipe 2 is connected by link each other with fixed core pipe 3, and connected mode is for being threaded, welding or cutting ferrule connection.Can change Water conservancy diversion core pipe 2 easily.
Described blast cap outer cover aperture 6 quantity is 6 ~ 20, and blast cap outer cover aperture 6 is downward-sloping is 5 ~ 30 ° with horizontal sextant angle, and as shown in Figure 7, its shape is circle, rectangle or combination that is circular and rectangle, and equivalent diameter is 8 ~ 20mm, air outlet velocity 20 ~ 50m/s.
A kind of Wear-resistance leak-proof slag blast cap with combination core pipe of the present embodiment, has the fire-resistant abrasion-proof castable 9 of 150mm between blast cap outer cover 4 times edges and air distribution plate 7 top; Water conservancy diversion core pipe 2 has 2 row's Water conservancy diversion core pipe apertures 5, often arrange Water conservancy diversion core pipe aperture and be 8 and along Water conservancy diversion core pipe 2 circumferencial direction disposed at equal distance, small aperture is 6mm, blast cap outer cover 4 has 10 circular blast cap outer cover apertures 6, small aperture 15mm, aperture is downward-sloping is 15 ° with the angle of horizontal plane; Blast cap outer cover 4, Water conservancy diversion core pipe 2 and fixed core pipe 3 all adopt ZG40Cr25Ni20 cast to form.Water conservancy diversion core pipe 2 and fixed core pipe 3 wall thickness 5mm, blast cap outer cover 4 top wall thickness 10mm, blast cap outer cover 4 bottom thickens the thickness 20mm of wall 15.
The Renewal process of Wear-resistance leak-proof slag blast cap of the present invention is: when changing blast cap outer cover 4 to CFBB, first polish off original pad of special-shaped plug link 16 and blast cap outer cover apical pore 10, take off to retighten after old blast cap outer cover 4 replaces with new blast cap outer cover 4 and weld; When CFBB adopted the blast cap of other version originally, comparatively serious owing to leaking slag, Wear-resistance leak-proof slag blast cap of the present invention need be replaced by, first original blast cap core pipe is therefrom blocked, the fixed core pipe 3 internal diameter being less than original core pipe inserts, and be fixed together with the form of welding and original core pipe, respectively Water conservancy diversion core pipe 2, special-shaped plug 1 and blast cap outer cover 4 are installed afterwards, namely complete replacing.
Certain boiler was originally provided with bell-type windshield 2615, annual blowing out 3 times, needs to change blast cap more than 200 at every turn, comparatively serious owing to leaking slag, be replaced by after the present invention combines core pipe Wear-resistance leak-proof slag blast cap, each blowing out is changed blast cap quantity and can be reduced within 20.
Claims (8)
1. the Wear-resistance leak-proof slag blast cap with combination core pipe, it is characterized in that: comprise top have apical pore (10) and bottom have bottom outlet (11) blast cap outer cover (4) and through blast cap outer cover (4) and and its fixing combination core pipe (12), described combination core pipe (12) is by special-shaped plug (1), Water conservancy diversion core pipe (2) and fixed core pipe (3) connect and compose successively, combination core pipe (12) is fixed with blast cap outer cover (4) by the apical pore (10) of special-shaped plug (1) through blast cap outer cover (4), passage gaps is left between the outer wall of combination core pipe (12) and the inwall of blast cap outer cover (4), combination core pipe (12) is closely passed the bottom outlet (11) of blast cap outer cover (4) and is fixed through air distribution plate (7) perforate and air distribution plate (7) by fixed core pipe (3), Water conservancy diversion core pipe (2) upper side circumferentially has multiple Water conservancy diversion core pipe apertures (5), blast cap outer cover (4) bottom thickens wall (15) side and circumferentially has multiple downward-sloping blast cap outer cover apertures (6).
2. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: described special-shaped plug (1) comprises special-shaped plug link (16) and special-shaped plug base (17), special-shaped plug link (16) is circle, rectangle or triangle, and special-shaped plug link (16) outer wall is together with apical pore (10) welded top of blast cap outer cover (4).
3. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: described Water conservancy diversion core pipe (2) bottom is provided with Water conservancy diversion core pipe link (13), described fixed core pipe (3) top is provided with fixed core pipe link (14), Water conservancy diversion core pipe (2) is connected by link each other with fixed core pipe (3), and connected mode is for being threaded, welding or cutting ferrule connection.
4. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: the row of described Water conservancy diversion core pipe aperture (5) is for arrange along Water conservancy diversion core pipe (2) circumference one, or the two rows or three rows be arranged above and below, the quantity of often arranging Water conservancy diversion core pipe aperture (5) is 4 ~ 12, diameter is 3 ~ 15mm, air outlet velocity 30 ~ 60m/s.
5. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: described blast cap outer cover aperture (6) quantity is 6 ~ 20, blast cap outer cover aperture (6) is downward-sloping is 5 ~ 30 ° with horizontal sextant angle, shape is circle, rectangle or combination that is circular and rectangle, equivalent diameter is 8 ~ 20mm, air outlet velocity 20 ~ 50m/s.
6. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: the wall thickness of described Water conservancy diversion core pipe (2) and fixed core pipe (3) is 4 ~ 12mm, blast cap outer cover (4) top wall thickness is 10 ~ 35mm, and the thickness that bottom thickens wall (15) is 20 ~ 45mm.
7. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, is characterized in that: described Water conservancy diversion core pipe (2), fixed core pipe (3) and blast cap outer cover (4) all adopt nickel content be 10% ~ 25% high nickel heat-resistance stainless steel manufacture form.
8. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: under described blast cap outer cover (4) along and air distribution plate (7) top between have fire-resistant abrasion-proof castable (9), under fire-resistant abrasion-proof castable (9) upper surface and blast cap outer cover (4), the distance on edge is 0 ~ 10mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310326142.2A CN103423739B (en) | 2013-07-30 | 2013-07-30 | A kind of Wear-resistance leak-proof slag blast cap with combination core pipe |
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| CN201310326142.2A CN103423739B (en) | 2013-07-30 | 2013-07-30 | A kind of Wear-resistance leak-proof slag blast cap with combination core pipe |
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| CN103423739B true CN103423739B (en) | 2015-08-26 |
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| CN104560211B (en) * | 2015-01-22 | 2017-05-24 | 兖矿集团有限公司 | Gasification furnace |
| CN105090942B (en) * | 2015-08-19 | 2018-06-12 | 河南科技大学 | A kind of micro- wind cap device |
| CN105090980B (en) * | 2015-08-19 | 2017-11-24 | 河南科技大学 | A kind of spiral-flow type fluidized bed combustion device |
| CN106287684A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of blast cap for CFBB |
| CN106122952A (en) * | 2016-08-17 | 2016-11-16 | 山西平朔煤矸石发电有限责任公司 | A kind of CFB boiler nested type blast cap air-distribution device and remodeling method thereof |
| CN106705032B (en) * | 2017-03-21 | 2019-04-16 | 陕西华电瑶池发电有限公司 | Circulating fluidized bed boiler based on denitration minimum discharge technology |
| WO2019043830A1 (en) * | 2017-08-30 | 2019-03-07 | 三菱日立パワーシステムズ株式会社 | Air nozzle, outer casing, boiler, power generation system, and method for replacing air nozzle outer casing |
| KR101921254B1 (en) * | 2018-04-25 | 2018-11-22 | 성실기계 주식회사 | Air Circulation Nozzle Device for Fluidized Bed Combustor |
| CN109028046B (en) * | 2018-07-17 | 2019-12-20 | 丁杨洋 | Blast cap used on boiler in power industry |
| CN109780538A (en) * | 2019-01-24 | 2019-05-21 | 青岛华晨伟业电力科技工程有限公司 | A kind of circulating fluidized bed combustion coal boiler strong wind cap assembly |
| CN111637454A (en) * | 2020-07-07 | 2020-09-08 | 大连蓝天智众科技有限公司 | Core tube for air distribution plate |
| CN111780098B (en) * | 2020-07-24 | 2024-05-10 | 中国科学院工程热物理研究所 | Air distribution device, combustion system and solid material treatment equipment |
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