CN101832637B - Hot water boiler with large-capacity water tubes - Google Patents
Hot water boiler with large-capacity water tubes Download PDFInfo
- Publication number
- CN101832637B CN101832637B CN2010101349929A CN201010134992A CN101832637B CN 101832637 B CN101832637 B CN 101832637B CN 2010101349929 A CN2010101349929 A CN 2010101349929A CN 201010134992 A CN201010134992 A CN 201010134992A CN 101832637 B CN101832637 B CN 101832637B
- Authority
- CN
- China
- Prior art keywords
- furnace
- cooling
- convection
- drum
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 50
- 239000012528 membrane Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003245 coal Substances 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 241000273930 Brevoortia tyrannus Species 0.000 claims description 4
- 206010012735 Diarrhoea Diseases 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Abstract
The invention relates to a hot water boiler with large-capacity water tubes. A hearth water-cooling wall and a heat-insulating furnace wall are arranged on a body support, a sealing device is arranged at the joint of the body support and the heat-insulating furnace wall, a burning device and a coal-feeding hopper are mounted at the lower part of the hearth water-cooling wall, a platform staircase and a descending tube are arranged outside the hearth water-cooling wall and the heat-insulating furnace wall, an upper drum is mounted at the top of the hearth water-cooling wall by a steel frame, the rear part of the heat-insulating furnace wall is connected with a flue, the flue and a coal saver are connected with an air preheater, a lower drum support is arranged in a furnace chamber and provided with two lower drums, a group of convection tube membrane walls are arranged between the lower drums and the upper drum, convection tube bundles are arranged among the convection tube membrane walls, the inner wall surface of the heat-insulating furnace wall is the hearth water-cooling wall, a burn-out room is formed by the rear part of the hearth water-cooling wall at two lateral walls and the outermost convection tube membrane wall, all the convection tube bundles are classified into two convection heat-transferring areas by the convection tube membrane walls, and dust-falling devices are arranged at the lower parts of the burn-out rooms and the convection tube bundles. The hot water boiler with full water tubes has long service life and high heat-transferring efficiency.
Description
Technical field
The present invention relates to a kind of hot-water boiler, especially a kind of three drum longitudinal chain type of furnace hot water boiler with large-capacity water tubes.
Background technology
SZL type boiler (promptly two drum longitudinal chain-grate boiler) is a kind of common boiler plant in the Industrial Boiler, is that the basis from the KE of former Soviet Union type boiler grows up; It has compact conformation, and characteristics such as maintenance is convenient, fuel tolerance is wide, boiler thermal output is high, Load Regulation is simple are installed, and has obtained using widely at boiler industry.SZL type water pipe hot-water boiler is a kind of in the SZL type boiler; Its structure comprises combustion apparatus, burner hearth (water-cooling wall), upper drum, lower drum, convection bank and compositions such as back-end surfaces economizer, air preheater, and boiler body is supported on the combustion apparatus framework through burner hearth both walls water-cooling wall and lower drum; Fume side and working medium side flow process are described below during operation; The high-temperature flue gas that fuel burns on combustion apparatus and produces; The forward and backward arch that forms through the forward and backward wall water-cooling wall of burner hearth bottom goes upward to the burner hearth outlet flue along burner hearth, and the burning chamber that flows through successively again, convection bank, economizer, air preheater get into the outside smoke processing system of boiler; The backwater of heat network system gets into upper drum through the boiler feedwater operating platform after the economizer heating; After in the closed circuit that upper drum, down-comer, furnace wall cooling and last lower drum, convection bank are formed, carrying out natural circulation heating then, reach specified leaving water temperature, supply water to heat supply network from the upper drum delivery port at last in the upper drum mixing.The boiler of this type in the shortcoming of structure aspects is: drum is for vertically arranging; Upper drum runs through the whole cooker furnace body; All boiler body heating surfaces comprise that furnace wall cooling all links to each other with upper drum with convection bank, and the length and the width of boiler are restricted, when the heating load of boiler need be increased to a certain degree (>=46MW) time; The heating surface that increases boiler body on year-on-year basis is relatively more difficult; Boiler body is to be supported on the combustion apparatus framework through burner hearth both walls water-cooling wall and lower drum in addition, and the length and width that so also limited boiler are high, and it is difficult to big capacity development.
In order to increase the heating load of boiler; Existing a kind of SZL type shell type water-fire tube hot-water boiler; The boiler of this type has arranged that in lower drum a large amount of threaded flue (being fire tube) increases the heating surface of boiler, has brought some shortcomings of multitubular boiler like this, like the fouling in working medium side of fire tube and tube sheet thereof; The dust stratification of fume side, stifled ash, problems such as the cold end corrosion of smoke outlet all are difficult to solve.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the prior art, the heat supply that provides a kind of heating load significantly to improve, can satisfy large-scale heat supply network requires, boiler is full water pipe structure, the hot water boiler with large-capacity water tubes of unfired tube heating surface.
According to technical scheme provided by the invention, said hot water boiler with large-capacity water tubes is included in the furnace wall cooling and insulation furnace wall that are provided with on the body supports; Junction at body supports and insulation furnace wall is provided with sealing device, in the furnace wall cooling bottom combustion apparatus is installed, and is equipped with on the combustion apparatus to add coal bunker; Furnace wall cooling is provided with platform staircase and down-comer with insulation furnace wall outside, and the top of furnace wall cooling is equipped with upper drum through steelframe, and upper drum is provided with instrument valve; Insulation furnace wall rear portion is connected with flue; Be connected with economizer on the flue, be connected with air preheater on the economizer, be provided with the lower drum bearing in the furnace chamber below upper drum; The lower drum bearing is provided with two lower drums; Be equipped with one group of convection tube membrane wall between each lower drum and the upper drum, between the convection tube membrane wall, be provided with convection bank, and the internal face of insulation furnace wall is furnace wall cooling; Furnace wall cooling rear portion on the both walls and outermost convection tube membrane wall are formed burning chamber; All convection banks are divided into two convection heat transfer' heat-transfer by convection districts by the convection tube membrane wall, are provided with ash dropped unit in burning chamber and convection bank bottom, and this ash dropped unit structure choice ash dropped unit commonly used at present gets final product.
Said furnace wall cooling is the full film type wall structure, and the furnace wall cooling top on the burner hearth front-back wall is the double-sided exposure water-cooling wall, and this double-sided exposure water-cooling wall has loose bowels number row to form in burner hearth by the furnace wall cooling on burner hearth front-back wall top.Furnace wall cooling wherein is full film type wall structure (is to connect into an integral body with band steel between water screen tube, both increased the unit heating surface area of water-cooling wall, guaranteed excellent sealing performance again).
The present invention significantly improves under the prerequisite that satisfies heat supply network heat supply requirement in heating load, and flue heating surface is not set, and is full water pipe hot-water boiler, has kept all advantages of water pipe hot-water boiler, and heat transfer efficiency is high, and accident potential is few, and the maintenance amount is little, and economic benefit is high.
Description of drawings
Fig. 1 is an overall structure sketch map of the present invention.
Fig. 2 is the A-A cutaway view of Fig. 1.
The specific embodiment
Below in conjunction with concrete accompanying drawing and embodiment the present invention is described further.
As shown in the figure, the present invention mainly by combustion apparatus 1, down-comer 2, platform staircase 3, furnace wall cooling 4, steelframe 5, instrument valve 6, flue 7, economizer 8, air preheater 9, upper drum 10, insulation furnace wall 11, burning chamber 12, convection bank 13, lower drum 14, lower drum bearing 15, ash dropped unit 16, sealing device 17, body supports 18, add devices such as coal bunker 19 and convection tube membrane wall 20 and constitute.
This hot water boiler with large-capacity water tubes is included in the furnace wall cooling 4 and insulation furnace wall 11 that are provided with on the body supports 18, is provided with sealing device 17 in body supports 18 and the junction that is incubated furnace wall 11; In furnace wall cooling 4 bottoms combustion apparatus 1 is installed, is equipped with on the combustion apparatus 1 and adds coal bunker 19, furnace wall cooling 4 is provided with platform staircase 3 and down-comer 2 with insulation furnace wall 11 outsides; The top of furnace wall cooling 4 is equipped with upper drum 10 through steelframe 5, and upper drum 10 is provided with instrument valve 6, and insulation furnace wall 11 rear portions are connected with flue 7; Be connected with economizer 8 on the flue 7, be connected with air preheater 9 on the economizer 8, in the furnace chamber of upper drum 10 lower rear, be provided with convection bank 13; Convection bank 13 has 14, two lower drums 14 of two lower drums and is supported on the lower drum bearing 15, makes that boiler of the present invention is a lower support; Whole upwards expansion type is equipped with one group of convection tube membrane wall 20 between each lower drum 14 and the upper drum 10, between convection tube membrane wall 20, be provided with convection bank 13; And the internal face of insulation furnace wall 11 is furnace wall cooling 4; Furnace wall cooling 4 rear portions on the both walls and outermost convection tube membrane wall 20 are formed burning chamber 12, and all convection banks 13 are divided into two convection heat transfer' heat-transfer by convection districts by convection tube membrane wall 20, make that the flue gas flow rate in convection bank district is more reasonable; The high-temperature flue gas that comes out from burner hearth carries out earlier radiation and convection heat transfer' heat-transfer by convection burning chamber; Improve the radiant heat transfer efficient of boiler like this, further reduced flue-gas temperature, passed through the convection heat transfer' heat-transfer by convection in convection bank district again; Reach the heat absorption of heated surface at the end of boiler economizer and air preheater, thereby guaranteed the overall thermal efficient of boiler; Be provided with ash dropped unit 16 in burning chamber 12 with convection bank 13 bottoms.
Boiler integral body of the present invention is lower support, expansion type makes progress; Said furnace wall cooling 4 is the full film type wall structure; And 4 tops of the furnace wall cooling on the front-back wall are the double-sided exposure water-cooling wall; This double-sided exposure water-cooling wall is had loose bowels number row by the furnace wall cooling 4 on burner hearth front-back wall top and is formed in burner hearth, to increase the heating surface area of burner hearth.
Owing to be provided with lower drum bearing 15 in the furnace chamber below upper drum 10; Lower drum bearing 15 is provided with two lower drums 14; Can arrange the convection tube of greater number like this, the convection heating surface that has increased boiler greatly is long-pending, and whole convection bank district is divided into first, second two convection heat transfer' heat-transfer by convection districts of symmetry along flue gas flow by several convection tube membrane walls; Make that the flue gas flow rate in convection bank district is more reasonable, guaranteed the heat transfer efficiency of convection bank.
Because all be furnished with ash dropped unit 16 in the burning chamber 12 of boiler and the bottom in whole convection bank 13 districts, ash at any time can fall in boiler operatiopn.Can guarantee that boiler needn't the blowing out deashing in the whole heat supply phase.
Body supports 18 among the present invention comprises totally ten two the collection case supporting seats that are symmetrically arranged; Collection case supporting seat is welded on the both walls water-cooling wall next part case; The lower end is supported on the embedded board of boiler ground, and cushioning lubriation material between boiler ground embedded board, can slide relatively; Lower drum bearing 15 comprises two hold-down supports and two movable bearing supports; Crossbeam on hold-down support and lower drum and the steelframe 5 is welded to connect; Be flexible connection between movable bearing support and lower drum, and be welded to connect between the crossbeam on the steelframe 5 that the whole cooker furnace body is supported on steelframe 5 and the boiler ground through body supports 18 and lower drum bearing 15; This mode both can guarantee the support requirement of boiler, in the time of can satisfying boiler operatiopn again to expansion requirement forward and backward, left and right and upwards.
Claims (2)
1. hot water boiler with large-capacity water tubes; Comprise combustion apparatus (1), platform staircase (3), furnace wall cooling (4), instrument valve (6), economizer (8), air preheater (9), insulation furnace wall (11), body supports (18); Go up furnace wall cooling (4) and the insulation furnace wall (11) that is provided with in body supports (18); Junction at body supports (18) and insulation furnace wall (11) is provided with sealing device (17), in furnace wall cooling (4) bottom combustion apparatus (1) is installed, and is equipped with on the combustion apparatus (1) to add coal bunker (19); Furnace wall cooling (4) and insulation furnace wall (11) outside are provided with platform staircase (3) and down-comer (2); The top of furnace wall cooling (4) is equipped with upper drum (10) through steelframe (5), and upper drum (10) is provided with instrument valve (6), and insulation furnace wall (11) rear portion is connected with flue (7); Be connected with economizer (8) on the flue (7); Be connected with air preheater (9) on the economizer (8), it is characterized in that: in the furnace chamber of upper drum (10) below, be provided with lower drum bearing (15), lower drum bearing (15) is provided with two lower drums (14); Be equipped with one group of convection tube membrane wall (20) between each lower drum (14) and the upper drum (10); Between convection tube membrane wall (20), be provided with convection bank (13), and the internal face of insulation furnace wall (11) is furnace wall cooling (4), (4) rear portion of the furnace wall cooling on the both walls and outermost convection tube membrane wall (20) composition burning chamber (12); All convection banks (13) are divided into two convection heat transfer' heat-transfer by convection districts by convection tube membrane wall (20), are provided with ash dropped unit (16) in burning chamber (12) and convection bank (13) bottom.
2. hot water boiler with large-capacity water tubes as claimed in claim 1; It is characterized in that: said furnace wall cooling (4) is the full film type wall structure; And the furnace wall cooling on the burner hearth front-back wall (4) top is the double-sided exposure water-cooling wall, and this double-sided exposure water-cooling wall has loose bowels number row to form in burner hearth by the furnace wall cooling (4) on burner hearth front-back wall top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101349929A CN101832637B (en) | 2010-03-18 | 2010-03-18 | Hot water boiler with large-capacity water tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101349929A CN101832637B (en) | 2010-03-18 | 2010-03-18 | Hot water boiler with large-capacity water tubes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101832637A CN101832637A (en) | 2010-09-15 |
| CN101832637B true CN101832637B (en) | 2012-08-22 |
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ID=42716796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101349929A Expired - Fee Related CN101832637B (en) | 2010-03-18 | 2010-03-18 | Hot water boiler with large-capacity water tubes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101832637B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287909B (en) * | 2011-06-22 | 2013-06-05 | 南通万达锅炉有限公司 | Horizontal natural gas fired hot-water boiler |
| CN102297509B (en) * | 2011-09-30 | 2013-06-05 | 哈尔滨市天地宽节能技术有限公司 | Boiler drum longitudinally arranged chain grate hot water boiler |
| CN106288362A (en) * | 2016-10-20 | 2017-01-04 | 上海工业锅炉无锡有限公司 | Brace type straw direct burning boiler |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001296000A (en) * | 2000-04-17 | 2001-10-26 | Hirakawa Guidom:Kk | Fusible plug |
| CN2432516Y (en) * | 2000-06-16 | 2001-05-30 | 董新民 | Domestic boiler |
| CN2575542Y (en) * | 2002-10-11 | 2003-09-24 | 王惠生 | Electromagnetic induction hot tube heat conduction oil stove |
| CN2586928Y (en) * | 2002-10-14 | 2003-11-19 | 班少忠 | Energy-saving boiler |
| CN2588281Y (en) * | 2002-12-03 | 2003-11-26 | 濮阳市奥依尔电器仪表有限公司 | Heat-exchanging coiler for heating-furnace |
| CN201715694U (en) * | 2010-03-18 | 2011-01-19 | 无锡太湖锅炉有限公司 | Large-capacity water pipe hot-water boiler |
-
2010
- 2010-03-18 CN CN2010101349929A patent/CN101832637B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101832637A (en) | 2010-09-15 |
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