CN203464242U - High-medium-low temperature overall economizer for coal-fired boiler - Google Patents
High-medium-low temperature overall economizer for coal-fired boiler Download PDFInfo
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- CN203464242U CN203464242U CN201320531684.9U CN201320531684U CN203464242U CN 203464242 U CN203464242 U CN 203464242U CN 201320531684 U CN201320531684 U CN 201320531684U CN 203464242 U CN203464242 U CN 203464242U
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- 238000005299 abrasion Methods 0.000 claims abstract description 15
- 230000008676 import Effects 0.000 claims description 13
- 230000002411 adverse Effects 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 206010022000 influenza Diseases 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 239000003245 coal Substances 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 5
- 239000003546 flue gas Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- 230000023556 desulfurization Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 238000013517 stratification Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 210000003298 dental enamel Anatomy 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a high-medium-low temperature overall economizer for a coal-fired boiler. The high-medium-low temperature overall economizer comprises a coal-fired boiler flue formed by a front wall, a rear wall and two side walls, a plurality of integrated spiral finned tubes are arrayed in sequence along the same direction and are connected by 180-degree connecting elbows, connecting polished pipes and connecting bends to form tube bundles in an upper level economizer and a lower level economizer; the integrated spiral finned tubes in the upper level economizer are vertical to the front wall and are arrayed in a countercurrent staggered way; the integrated spiral finned tubes in the lower level economizer are vertical to the side walls and are arrayed in a countercurrent sequence way. According to the technical scheme, the bearing capability, the heat exchange area and the heat transfer effect of the whole economizer are improved, the boiler outage accidents caused by the high smoke discharge temperature, the ash accumulation, the abrasion and the corrosion of the economizer are eradicated, the safety running time of the boiler is greatly prolonged, the coal consumption of the boiler is reduced, the normal operation of a flue gas desulfurization and denitration system can be effectively ensured, the structure is compact, the cost recovery is rapid, the service life is long, the applicable range is wide, and the energy-saving benefit is obvious.
Description
Technical field
The utility model relates to a kind of coal-fired economizer, particularly relates to the whole economizer of senior middle school's low temperature for a kind of coal-burning boiler.
Background technology
In the boiler design of prior art, exhaust gas temperature is generally more than 125 ℃, meager coal and anthracite-fired boiler, be generally 140 ℃ of left and right, the exhaust gas temperature of high-moisture brown coal is conventionally 150 ℃ of left and right, if the sulfur content of coal is high, exhaust gas temperature will be higher.
The conventional heat exchange element of economizer hand no matter high, middle low-temperature zone has light pipe, H type finned tube, tooth finned tube, high-frequency resistance welding (HFRW), soldering spiral fin coil etc. at present, through operation, facts have proved, this several types economizer piping ubiquity high fume temperature, heat transfer effect are poor, and be all by improving heat exchange area, heat exchange material is expanded and overcoming the not enough or unfavorable of heating surface, deficiency and the defect for problems such as the dust stratification of heat exchange surface, corrosion, brought cannot solve.
On newly constructed boiler or transformation boiler, need careful selection to use suitable heat exchange element to make senior middle school's low-temperature zone economizer for this reason, in the situation that not increasing afterbody heat exchanger, guaranteeing the normal operation of desulphurization denitration simultaneously, reduce unnecessary operating cost that boiler causes because of phenomenons such as economizer dust stratification, wearing and tearing, corrosion, safeguard, open park-ing cost.
Chinese patent, notification number is CN 102519278A, a kind of heat exchanger that reclaims heat from dust-laden sour gas is disclosed, Chinese patent, notification number is CN 202432504U, a kind of low-level (stack-gas) economizer for recovered flue gas low temperature exhaust heat is disclosed, these two technical schemes are the smoke gas afterheat heat exchangers that use monolithic devices spiral fin coil to design and produce, economizer or heat exchanger that the monolithic devices spiral fin coil of take is made as heat exchange element, there is heat exchange efficiency high, bearing capacity is strong, windage characteristic is good, compact conformation, the advantages such as long service life, but consider heating surface layout and Anticorrosion, the former adopts ND(09CrCuSb by heat-exchanging tube bundle) make, the latter designs mainly for sour gas, on heat-exchanging tube bundle surface, be coated with enamel layer, but above two kinds of designs are mainly applicable to low-temperature zone, and material requires high, be not suitable for high temperature, middle-temperature section economizer is arranged, or three sections of economizer co-design of the whole senior middle school of boiler low temperature are used.
Utility model content
In view of this, main purpose of the present utility model is to provide the whole economizer of senior middle school's low temperature for a kind of coal-burning boiler, pass through the technical program, not only there is heat exchange efficiency high, bearing capacity is strong, windage characteristic is good, compact conformation, on simultaneously can the whole economizer for the high, medium and low temperature of coal-burning boiler, and by the control to exhaust gas temperature, thereby reach and reduce dust stratification, wearing and tearing, corrosion phenomenon in coal-fired economizer as far as possible, anti-dust stratification anti-corrosion anti-abrasion damage effect is good, increases the service life.
In order to achieve the above object, the technical solution of the utility model is achieved in that the whole economizer of senior middle school's low temperature for a kind of coal-burning boiler, include front wall, Hou Qiang and two coal-burning boiler flues that side wall forms, the top of described coal-burning boiler flue communicates with the furnace outlet of coal-burning boiler, several economizers are arranged in coal-burning boiler flue from top to bottom, described economizer consists of monolithic devices spiral fin coil and economizer intermediate header, described economizer is divided into higher level's economizer and subordinate's economizer two-staqe fixing, the pipe row of higher level's economizer and subordinate's economizer is for several monolithic devices spiral fin coils are through 180 ° of bridge pieces, connecting light pipe and connecting bend is formed by connecting, in economizer, each pipe row is arranged in order in the same way, monolithic devices spiral fin coil in higher level's economizer is staggered in arrangement perpendicular to front wall adverse current, monolithic devices spiral fin coil in subordinate's economizer is perpendicular to side wall adverse current in-line arrangement, between higher level's economizer and subordinate's economizer two-stage, be respectively arranged with economizer import header and economizer exit header.
Described higher level's economizer consists of high temperature section economizer, described subordinate economizer by low-temperature zone economizer form.
In described economizer, monolithic devices spiral fin coil is to adopt the rolling of many rods roll extrusion technology to form, described monolithic devices spiral fin coil consists of base tube and helical fin, on transition face between described base tube and helical fin, be provided with R knuckle, the cross sectional shape of described helical fin is trapezoidal.
On described high temperature section economizer, middle low-temperature zone economizer, be respectively arranged with end plate, bracing frame one end is connected with end plate, and the bracing frame other end is fixed on ventilation beam; Economizer import header and economizer exit header between high temperature section economizer, middle low-temperature zone economizer are separately fixed on boiler body steelframe.
In described high temperature section economizer, monolithic devices spiral fin coil adopts heavy wall monolithic devices spiral fin coil, on 180 ° of bridge pieces of high temperature section economizer, be provided with positioning wear plate, on connecting bend, be provided with elbow anti-abrasion cover, on connection light pipe, be provided with straight-tube anti-abrasion cover.
Adopt the beneficial effect after technique scheme to be: the whole economizer of senior middle school's low temperature for a kind of coal-burning boiler, pass through the technical program, economizer adopts two-stage setting, air preheater arranged crosswise, improved whole bearing capacity, heat exchange area and heat-transfer effect, stopped because economizer high fume temperature, dust stratification, abrasion and corrosion problem and the shutdown of boiler accident that causes, greatly improved the safe operation of the boiler time, reduced boiler coal consumption, can effectively guarantee the normal operation of flue gas desulfurization and denitrification system simultaneously, compact conformation, cost recovery is fast, long service life, applied widely, energy-saving benefit is obvious.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model monolithic devices spiral fin coil.
Fig. 2 is the schematic diagram of link side by side of the utility model monolithic devices spiral fin coil.
Fig. 3 be in Fig. 2 A-A to cutaway view.
Fig. 4 is the schematic diagram of the utility model high temperature section economizer.
Fig. 5 is the schematic diagram of low-temperature zone economizer in the utility model.
Fig. 6 is whole coal-burning boiler and flue structure schematic diagram.
Fig. 7 is Fig. 6 left view.
In figure, in 1 monolithic devices spiral fin coil, 2 end plates, 3 180 ° of bridge pieces, 4 connecting bends, 5 bracing frames, 6 base tubes, 7 helical fins, 8 ventilation beams, 9, in low-temperature zone import header, 10, low-temperature zone outlet header, 11 high temperature section import headers, 12 high temperature section outlet headers, 13 straight-tube anti-abrasion covers, 14 elbow anti-abrasion covers, 15 positioning wear plates, 16 drums, 17 loading pipes, 18 coal-burning boiler flues, 19 front walls, 20 rear walls, 21 side walls, 22 connect low-temperature zone economizer, 25 high temperature section economizers, 26 boiler body steelframes in light pipes, 23 R knuckles, 24.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is described further.
The whole economizer of senior middle school's low temperature for the coal-burning boiler that the utility model relates to, include front wall 19, rear wall 20 and two coal-burning boiler flues 18 that side wall 21 forms, the top of described coal-burning boiler flue 18 communicates with the furnace outlet of coal-burning boiler, several economizers are arranged in coal-burning boiler flue 18 from top to bottom, described economizer consists of monolithic devices spiral fin coil 1 and economizer intermediate header, described economizer is divided into the two-staqe fixing of higher level's economizer and subordinate's economizer, the pipe row of higher level's economizer and subordinate's economizer is for several monolithic devices spiral fin coils 1 are through 180 ° of bridge pieces 3, connecting light pipe 22 and connecting bend 4 is formed by connecting, in economizer, each pipe row is arranged in order in the same way, monolithic devices spiral fin coil 1 in higher level's economizer is staggered in arrangement perpendicular to front wall 19 adverse currents, monolithic devices spiral fin coil 1 in subordinate's economizer is perpendicular to side wall 21 adverse current in-line arrangements, between higher level's economizer and subordinate's economizer two-stage, be respectively arranged with economizer import header and economizer exit header.
Described higher level's economizer consists of high temperature section economizer 25, described subordinate economizer by low-temperature zone economizer 24 form.
In described economizer, monolithic devices spiral fin coil 1 is to adopt the rolling of many rods roll extrusion technology to form, described monolithic devices spiral fin coil 1 consists of base tube 6 and helical fin 7, on transition face between described base tube 6 and helical fin 7, be provided with R knuckle 23, the cross sectional shape of described helical fin 7 is trapezoidal.
On described high temperature section economizer 25, middle low-temperature zone economizer 24, be respectively arranged with end plate 2, bracing frame 5 one end are connected with end plate 2, and bracing frame 5 other ends are fixed on ventilation beam 8; The economizer import header between high temperature section economizer 25, middle low-temperature zone economizer 24 and economizer exit header by high temperature section import header 11, high temperature section outlet header 12, in low-temperature zone import header 9 and middle low-temperature zone outlet header 10 form, described high temperature section outlet header 12, middle low-temperature zone import header 9 and middle low-temperature zone outlet header 10 are separately fixed on boiler body steelframe 26.
In described high temperature section economizer 25, monolithic devices spiral fin coil 1 adopts heavy wall monolithic devices spiral fin coil 1, in high temperature section economizer 25 and middle low-temperature zone economizer 24, on 180 ° of bridge pieces 3, be provided with positioning wear plate 15, on connecting bend 4, be provided with elbow anti-abrasion cover 14, on connection light pipe 22, be provided with straight-tube anti-abrasion cover 13.
The utility model is when work, flue gas flows downward through high temperature section economizer 25, middle low-temperature zone economizer 24 from upper, first boiler feedwater enters middle low-temperature zone import header 9, from bottom to top with forced convective heat transfer of flue, to middle low-temperature zone outlet header 10, by connecting light pipe 22, enter high temperature section import header 11, with forced convective heat transfer of flue, to high temperature section outlet header 12, enter the rear circulation of drum 16 from bottom to top.
The integrated moulding of described monolithic devices spiral fin coil 1, contactless thermal resistance, between base tube 6 roots and the helical fin 7 extruded, be provided with R knuckle 23, helical fin 7 is trapezoidal shape, and teeth groove forms the self-cleaning of vortex, be difficult for dust stratification, even if there is the axial wind speed of its root of a small amount of dust stratification to be conducive to self-cleaning, windage characteristic is good, be increased to the twice of other structures with corrosion resistance under working condition more than, with service life and the heat-transfer effect that guarantees that this economizer is longer, improve energy-saving effect.
In specific embodiment of the utility model.
1. four 260t/h HTHP Π types are arranged pulverized-coal fired boiler, design fire coal is meager coal, feed temperature is 215 ℃, exhaust gas temperature is 130 ℃, for reaching designing requirement, in coal-burning boiler flue 18, adopt the monolithic devices spiral fin coil 1 of high temperature section economizer 25 and middle low-temperature zone economizer 24, high temperature section economizer 25 and middle low-temperature zone economizer 24 two-stages, at height, middle low temperature two-stage air preheater arranged crosswise, high temperature section economizer is drawn by horizontal flue bottom, perpendicular to front wall 19 adverse currents, be staggered in arrangement, middle low-temperature zone economizer 24 is perpendicular to side wall 21 adverse current in-line arrangements, in high temperature section economizer 25 and middle low-temperature zone economizer 24, easily on the connection light pipe 22 of generation concentrated wear place, straight-tube anti-abrasion cover 13 is set, on connecting bend 4, be provided with elbow anti-abrasion cover 14, on several 180 ° of bridge pieces 3 of high temperature section economizer 25 and middle low-temperature zone economizer 24 1 sides, be provided with positioning wear plate 15, at entrance, Antiwear casing device is set, can effectively guarantee that exhaust gas temperature is between 120 ~ 130 ℃.
2. in four boilers adopts quick lime semi-dry desulphurization, three employing ammonia process of desulfurizations, the former entrance flue gas temperature requires can not be lower than 110 ℃, the latter requires can not be lower than 120 ℃, by monolithic devices spiral fin coil 1, change high temperature section economizer 25 first row pipings into light pipe, reduce heat transfer effect, to guarantee that desulphurization system normally moves.
3. high temperature section economizer 25 and middle low-temperature zone economizer 24 all use monolithic devices spiral fin coil 1, its helical fin 7 is trapezoidal shape, teeth groove forms the self-cleaning of vortex, be difficult for dust stratification, even if there is the axial wind speed of its root of a small amount of dust stratification to be conducive to self-cleaning, windage characteristic is good, without soot blower is set.
4. the local place easy to wear of high temperature section economizer 25, adopts respectively straight-tube anti-abrasion cover 13, elbow anti-abrasion cover 14 and positioning wear plate 15, to avoid high temperature section economizer 25 to leak because wearing and tearing.
5 high temperature section economizers 25 and middle low-level (stack-gas) economizer 24 adopt bracing frames 5 and end plate 2 fixing, ventilation beam 8 load-bearing, loading pipe 17 is suspended on boiler body steelframe 26, makes the various pipelines can free wxpansion.
6. high temperature section economizer 25 can be according to heat transfer effect and abrasionproof needs, fray employing heavy wall monolithic devices spiral fin coil 1 is easily occurring, and light-wall pipe and thick-walled pipe applied in any combination, also can adopt normal optical pipe to be combined with, to reach, meet national requirements, improve the object of heat-transfer effect.
The above, be only better possible embodiments of the present utility model, not in order to limit scope of the present utility model.
Claims (5)
1. the whole economizer of senior middle school's low temperature for a coal-burning boiler, include front wall, Hou Qiang and two coal-burning boiler flues that side wall forms, the top of described coal-burning boiler flue communicates with the furnace outlet of coal-burning boiler, several economizers are arranged in coal-burning boiler flue from top to bottom, it is characterized in that, described economizer consists of monolithic devices spiral fin coil and economizer intermediate header, described economizer is divided into higher level's economizer and subordinate's economizer two-staqe fixing, the pipe row of higher level's economizer and subordinate's economizer is for several monolithic devices spiral fin coils are through 180 ° of bridge pieces, connecting light pipe and connecting bend is formed by connecting, in economizer, each pipe row is arranged in order in the same way, monolithic devices spiral fin coil in higher level's economizer is staggered in arrangement perpendicular to front wall adverse current, monolithic devices spiral fin coil in subordinate's economizer is perpendicular to side wall adverse current in-line arrangement, between higher level's economizer and subordinate's economizer two-stage, be respectively arranged with economizer import header and economizer exit header.
2. the whole economizer of senior middle school's low temperature for coal-burning boiler according to claim 1, is characterized in that, described higher level's economizer consists of high temperature section economizer, described subordinate economizer by low-temperature zone economizer form.
3. the whole economizer of senior middle school's low temperature for coal-burning boiler according to claim 1, it is characterized in that, in described economizer, monolithic devices spiral fin coil is to adopt the rolling of many rods roll extrusion technology to form, described monolithic devices spiral fin coil consists of base tube and helical fin, on transition face between described base tube and helical fin, be provided with R knuckle, the cross sectional shape of described helical fin is trapezoidal.
4. the whole economizer of senior middle school's low temperature for coal-burning boiler according to claim 2, it is characterized in that, on described high temperature section economizer, middle low-temperature zone economizer, be respectively arranged with end plate, bracing frame one end is connected with end plate, and the bracing frame other end is fixed on ventilation beam; Economizer import header and economizer exit header between high temperature section economizer, middle low-temperature zone economizer are separately fixed on boiler body steelframe.
5. the whole economizer of senior middle school's low temperature for coal-burning boiler according to claim 3, it is characterized in that, in described higher level's economizer, monolithic devices spiral fin coil adopts heavy wall monolithic devices spiral fin coil, on 180 ° of bridge pieces of higher level's economizer and subordinate's economizer, be provided with positioning wear plate, on connecting bend, be provided with elbow anti-abrasion cover, on connection light pipe, be provided with straight-tube anti-abrasion cover.
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| CN201320531684.9U CN203464242U (en) | 2013-08-29 | 2013-08-29 | High-medium-low temperature overall economizer for coal-fired boiler |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566330A (en) * | 2014-07-17 | 2015-04-29 | 上海大众祥源动力供应有限公司 | Device for recovering waste heat in boiler flue |
| CN104732451A (en) * | 2015-03-10 | 2015-06-24 | 国家电网公司 | Low-pressure economizer energy saving assessment method applied to power plant thermal system |
| CN104896495A (en) * | 2015-06-10 | 2015-09-09 | 东方电气集团东方锅炉股份有限公司 | In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source |
| CN107477563A (en) * | 2016-06-07 | 2017-12-15 | 张家港市华正进出口贸易有限公司 | Coal saving device |
| CN110296389A (en) * | 2019-06-30 | 2019-10-01 | 无锡华光锅炉股份有限公司 | A kind of economizer arragement construction |
-
2013
- 2013-08-29 CN CN201320531684.9U patent/CN203464242U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566330A (en) * | 2014-07-17 | 2015-04-29 | 上海大众祥源动力供应有限公司 | Device for recovering waste heat in boiler flue |
| CN104566330B (en) * | 2014-07-17 | 2016-08-24 | 上海大众祥源动力供应有限公司 | Waste-heat recovery device in a kind of boiler flue |
| CN104732451A (en) * | 2015-03-10 | 2015-06-24 | 国家电网公司 | Low-pressure economizer energy saving assessment method applied to power plant thermal system |
| CN104732451B (en) * | 2015-03-10 | 2017-12-12 | 国家电网公司 | Low-pressure coal saver Evaluation on Energy Saving method for power plant therrmodynamic system |
| CN104896495A (en) * | 2015-06-10 | 2015-09-09 | 东方电气集团东方锅炉股份有限公司 | In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source |
| CN107477563A (en) * | 2016-06-07 | 2017-12-15 | 张家港市华正进出口贸易有限公司 | Coal saving device |
| CN110296389A (en) * | 2019-06-30 | 2019-10-01 | 无锡华光锅炉股份有限公司 | A kind of economizer arragement construction |
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