CN102135271B - Flue gas waste heat recovery energy-saver of boiler wet desulphurization system - Google Patents
Flue gas waste heat recovery energy-saver of boiler wet desulphurization system Download PDFInfo
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- CN102135271B CN102135271B CN 201110051127 CN201110051127A CN102135271B CN 102135271 B CN102135271 B CN 102135271B CN 201110051127 CN201110051127 CN 201110051127 CN 201110051127 A CN201110051127 A CN 201110051127A CN 102135271 B CN102135271 B CN 102135271B
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Abstract
The invention discloses a flue gas waste heat recovery energy-saver of a boiler wet desulphurization system, comprising a flue shell and a heat transfer pipe arranged in the flue shell. A flue gas inlet and a flue gas outlet are respectively arranged at two side faces of the flue shell; the heat transfer pipe is a series of serpentine pipes in parallel; each serpentine pipe comprises a plurality of straight pipes which are arranged in parallel and spaced uniformly and a plurality of bent pipes which are respectively connected to the same ends of two adjacent straight pipes in a staggered way; a water inlet of the heat transfer pipe is arranged at one end close to the flue gas outlet and a water outlet is arranged at one end close to the flue gas inlet; both the water inlet and the water outlet are leaded out from one side face vertical to the flue gas inlet and the flue gas outlet of the flue shell; 1-5 rows of the straight pipes close to the flue gas inlet end and the corresponding bent pipes are thick-wall pipes; the straight pipes and the bent pipes at other positions are thin-wall pipes; 2/5-3/5 rows of the straight pipes close to the flue gas outlet end and the corresponding bent pipes are special type steel pipes or stainless steel pipes; and the straight pipes and the bent pipes at other positions are NO.20 carbon steel pipes.
Description
Technical field
The present invention relates to a kind of be used for the feedwater of the heat of boiler tail flue gas is specifically related to a kind of flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system to reduce the device of exhaust gas temperature.
Technical background
Usually the temperature of the gas approach of boiler wet method desulphurization system is about 130 ℃, and the operating temperature of desulfurizing tower desulfurization is about 50 ℃.For the safe operation of desulfurizing tower, can only be before flue gas gets into desulfurizing tower spray cooling.Because the time that the desuperheating water that sprays contact with flue gas is short, and usefulness is normal-temperature water, and water temperature has only about 50 ℃ after spraying; Can't utilize; Therefore a large amount of fume afterheats is wasted, and also will consume a large amount of water simultaneously, so should reclaim this part fume afterheat with energy-saving and water-saving.Usually adopt economizer to reclaim this part fume afterheat in the industry.But also there are a lot of technical problems in the way of flue gas waste heat recovery in the prior art.Specifically, the technical problem that mainly has two aspects:
First: contain soot particle in this flue gas, when soot particle during with the heat-transfer pipe of sweep of gases heating surface, the impact of soot particle and shear action can produce wearing and tearing to the heating surface of heat-transfer pipe;
Second: the temperature of this flue gas is very low, and there is the flue gas low-temperature etching problem in the heating surface of heat-transfer pipe.
To the problems referred to above, demand developing a kind of flue gas waste heat recovery energy-saving appliance that can be applicable to the boiler wet method desulphurization system urgently.
Summary of the invention
The present invention has overcome deficiency of the prior art, and a kind of flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system is provided, and it has energy-saving and emission-reduction, and equipment cost is low, effect safe and reliable to operation.
Realize that the above-mentioned purpose technical scheme is: a kind of flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system; Said boiler wet method desulphurization system comprises boiler and desulfurizing tower, and said flue gas waste heat recovery energy-saving appliance places the smoke discharging pipe between said boiler and the desulfurizing tower.Said flue gas waste heat recovery energy-saving appliance comprises a flue housing and is located at the heat-transfer pipe in the flue housing.Wherein:
Said flue housing is the rectangular box that a metallic plate constitutes, and the two sides of the flow direction of flue gas are provided with gas approach and exhanst gas outlet respectively in the said relatively smoke discharging pipe of this flue housing;
Said heat-transfer pipe is the coiled pipe of a series of parallel connections; Each root coiled pipe comprises many straight tubes and many bend pipes; Said many straight tubes are as one man arranged with the mode vertical with the flue gas import and export direction of said flue housing abreast and at interval, and said many bend pipes are connected the same end of adjacent two straight tubes respectively stragglyly; The water inlet of this heat-transfer pipe is located at the end near said exhanst gas outlet; And delivery port is located at the end near said gas approach, and makes all drawing with a said gas approach side vertical with exhanst gas outlet from said flue housing of said water inlet and delivery port;
1～5 row's of nearly said gas approach end said straight tube is a thick-walled pipe with corresponding bend pipe, and the said straight tube of other position and bend pipe are light-wall pipe;
2/5～3/5 row's of nearly said smoke outlet said straight tube is Steel Tube Special or stainless steel tube with corresponding bend pipe, and the said straight tube of other position and bend pipe are No. 20 carbon steel pipes.
The flue gas waste heat recovery energy-saving appliance of above-mentioned boiler wet method desulphurization system, wherein, the wall thickness of said thick-walled pipe is 4～8mm, the wall thickness of said light-wall pipe is 3～4mm, and the external diameter of said light-wall pipe is identical with the external diameter of said thick-walled pipe.
The flue gas waste heat recovery energy-saving appliance of above-mentioned boiler wet method desulphurization system, wherein, between said light-wall pipe and the said thick-walled pipe for being welded to connect.
The flue gas waste heat recovery energy-saving appliance of above-mentioned boiler wet method desulphurization system, wherein, between said Steel Tube Special or stainless steel tube and said No. 20 carbon steel pipes for being welded to connect.
The flue gas waste heat recovery energy-saving appliance of above-mentioned boiler wet method desulphurization system, wherein, the thickness that constitutes the metallic plate of said flue housing is 6mm.
The flue gas waste heat recovery energy-saving appliance of above-mentioned boiler wet method desulphurization system, wherein, said flue housing with the said gas approach another side vertical with exhanst gas outlet on also offer some soot blowers hole.
The technical scheme of the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system of the present invention; Adopt 1～5 row's who increases nearly gas approach end the straight tube and the wall thickness of corresponding bend pipe, can replace the abrasionproof cover, make simple in structure; Cost reduces, and reaches simultaneously to prevent the effect of wearing and tearing and revealing; In addition 2/5～3/5 row's of nearly smoke outlet straight tube and corresponding bend pipe adopt good corrosion resistance can Steel Tube Special or stainless steel tube, can when preventing the flue gas low-temperature corrosion, reduce cost simplified structure.Therefore flue gas waste heat recovery energy-saving appliance of the present invention has energy-saving and emission-reduction, and equipment cost is low, effect safe and reliable to operation.
Description of drawings
Fig. 1 is the structural representation of the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system of the present invention;
Fig. 2 is the structural representation of heat-transfer pipe in the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system of the present invention.
The specific embodiment
In order to understand technical scheme of the present invention better, through the specific embodiment the present invention is described in further detail below.
Conventional boiler wet method desulphurization system comprises boiler and desulfurizing tower.The flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system of the present invention places the smoke discharging pipe between boiler and the desulfurizing tower.
See also Fig. 1 and Fig. 2, the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system of the present invention comprises a flue housing 1 and is located at the heat-transfer pipe 2 in the flue housing 1.
Flue housing 1 is the rectangular box that a metallic plate constitutes, and the thickness of metallic plate is 6mm.The left and right sides face of this flue housing 1 is provided with a gas approach 11 and an exhanst gas outlet 12 respectively.
Heat-transfer pipe 2 is the coiled pipe of a series of parallel connections; Each root coiled pipe comprises many straight tubes 21 and many bend pipes 22; Wherein, Many straight tubes 21 to be as one man to arrange with the vertical mode of direction of the flue gas import and export 11,12 of flue housing 1 abreast and at interval, promptly arrange about many straight tubes 21 mode with a coverage at interval, and many bend pipes 22 are connected the top and bottom of adjacent two straight tubes 21 respectively stragglyly; The water inlet 23 of this heat-transfer pipe 2 is located at the end near exhanst gas outlet 12, and delivery port 24 is located at the end near gas approach 11, and makes all drawing with exhanst gas outlet 12 vertical leading flanks with gas approach 11 from flue housing 1 of water inlet 23 and delivery port 24;
1～5 row's of nearly gas approach 11 ends straight tube 21 is a thick-walled pipe with corresponding bend pipe 22, and the straight tube 21 and the bend pipe 22 of other position are light-wall pipe;
In an illustrated embodiments, the wall thickness of thick-walled pipe is 4～8mm, and the wall thickness of light-wall pipe is 3～4mm, and the external diameter of thick-walled pipe is identical with the external diameter of light-wall pipe.Owing to contain dust in the flue gas of entering flue housing 1; Therefore there is wear problem in heat-transfer pipe 2, and the straight tube 21 and the wall thickness of corresponding bend pipe 22 that increase by 1～5 row of nearly gas approach 11 ends can replace the abrasionproof cover, make simple in structure; Cost reduces, and reaches simultaneously to prevent the effect of wearing and tearing and revealing;
Closely 2/5～3/5 of exhanst gas outlet 12 ends row's straight tube 21 is Steel Tube Special or the stainless steel tube with good corrosion resistance ability with corresponding bend pipe 22, and the straight tube 21 and the bend pipe 22 of other position are No. 20 carbon steel pipes.Because flue housing 1 is lower than the flue-gas temperature of gas approach 12 in the flue-gas temperature of nearly exhanst gas outlet 12, and is therefore stronger to the corrosivity of heat-transfer pipe 2.Therefore nearly exhanst gas outlet 12 ends (low temperature side) 2/5～3/5 row's straight tube 21 and corresponding bend pipe 22 adopt good corrosion resistance can Steel Tube Special or stainless steel tube, can when preventing the flue gas low-temperature corrosion, reduce cost simplified structure.
On the trailing flank of flue housing 1, also offer some soot blowers hole 13.Can adopt soot blower from soot blower hole 13, to extend in the flue housing 1 purges the dust stratification on flue housing 1 wooden partition.
The principle of the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system of the present invention is to utilize feedwater in heat-transfer pipe, to import and export constantly flowing of bringing out from entrance point; And flue gas transversal flow heat-transfer pipe; Thereby improved the temperature of feedwater in the heat-transfer pipe; Realize the exchange heat between flue gas and the feedwater, and make the discharged flue gas temperature be reduced to the required operating temperature of desulfurizing tower.
Above embodiment specifies the present invention, and those skilled in the art can make the many variations example to the present invention according to above-mentioned explanation.Thereby some details in the embodiment should not constitute qualification of the present invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (6)
1. the flue gas waste heat recovery energy-saving appliance of a boiler wet method desulphurization system; Said boiler wet method desulphurization system comprises boiler and desulfurizing tower; Said flue gas waste heat recovery energy-saving appliance places the smoke discharging pipe between said boiler and the desulfurizing tower; It is characterized in that; Said flue gas waste heat recovery energy-saving appliance comprises a flue housing and is located at the heat-transfer pipe in the flue housing, and said flue housing is the rectangular box that a metallic plate constitutes, and the two sides of the flow direction of flue gas are provided with gas approach and exhanst gas outlet respectively in the said relatively smoke discharging pipe of this flue housing;
Said heat-transfer pipe is the coiled pipe of a series of parallel connections; Each root coiled pipe comprises many straight tubes and many bend pipes; Said many straight tubes are as one man arranged with the mode vertical with the flue gas import and export direction of said flue housing abreast and at interval, and said many bend pipes are connected the same end of adjacent two straight tubes respectively stragglyly; The water inlet of this heat-transfer pipe is located at the end near said exhanst gas outlet; And delivery port is located at the end near said gas approach, and makes all drawing with a said gas approach side vertical with exhanst gas outlet from said flue housing of said water inlet and delivery port;
1～5 row's of nearly said gas approach end said straight tube is a thick-walled pipe with corresponding bend pipe, and the said straight tube of other position and bend pipe are light-wall pipe;
2/5～3/5 row's of nearly said smoke outlet said straight tube is Steel Tube Special or stainless steel tube with corresponding bend pipe, and the said straight tube of other position and bend pipe are No. 20 carbon steel pipes.
2. the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system according to claim 1; It is characterized in that; The wall thickness of said thick-walled pipe is 4～8mm, and the wall thickness of said light-wall pipe is 3～4mm, and the external diameter of said light-wall pipe is identical with the external diameter of said thick-walled pipe.
3. the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system according to claim 1 and 2 is characterized in that, between said light-wall pipe and the said thick-walled pipe for being welded to connect.
4. the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system according to claim 1 is characterized in that, between said Steel Tube Special or stainless steel tube and said No. 20 carbon steel pipes for being welded to connect.
5. the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system according to claim 1 is characterized in that, the thickness that constitutes the metallic plate of said flue housing is 6mm.
6. the flue gas waste heat recovery energy-saving appliance of boiler wet method desulphurization system according to claim 1 is characterized in that, said flue housing with the said gas approach another side vertical with exhanst gas outlet on also offer some soot blowers hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110051127 CN102135271B (en) | 2011-03-03 | 2011-03-03 | Flue gas waste heat recovery energy-saver of boiler wet desulphurization system |
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| CN 201110051127 CN102135271B (en) | 2011-03-03 | 2011-03-03 | Flue gas waste heat recovery energy-saver of boiler wet desulphurization system |
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| CN102135271A CN102135271A (en) | 2011-07-27 |
| CN102135271B true CN102135271B (en) | 2012-10-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152674B (en) * | 2017-06-23 | 2022-11-29 | 江西南方锅炉股份有限公司 | Boiler flue gas waste heat recoverer |
| CN111006521B (en) * | 2019-12-04 | 2021-04-27 | 山东王晁煤电集团新能发电有限公司 | Anti-blocking economizer structure |
| CN118031239A (en) * | 2023-05-26 | 2024-05-14 | 昌吉学院 | Corrosion-resistant boiler of flue gas waste heat recovery device |
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| US5293841A (en) * | 1992-03-06 | 1994-03-15 | Gea Luftkuhler Gmbh | Arrangement for utilizing the heat contained in the exhaust gas of a coal-fired boiler |
| CN201184586Y (en) * | 2008-04-07 | 2009-01-21 | 江纯招 | Energy-saving and emission-reducing hot water tank for boiler |
| CN201251192Y (en) * | 2008-07-08 | 2009-06-03 | 李鸿飞 | Air-purifying, warming and discharged-waste-gas recovering device |
| CN201407645Y (en) * | 2009-05-12 | 2010-02-17 | 南京加诺能源设备有限公司 | Radial heat pipe economizer |
| CN201462895U (en) * | 2009-07-01 | 2010-05-12 | 四平市东海石化设备制造有限公司 | Antiseptic wearable air pre-heater |
| CN101782274A (en) * | 2009-01-16 | 2010-07-21 | 夏嘉琪 | Heat energy recovering device for boiler tail gas |
| CN201983250U (en) * | 2011-03-03 | 2011-09-21 | 上海阿波罗机械股份有限公司 | Flue gas residual heat recycling economizer of boiler wet desulphurization system |
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2011
- 2011-03-03 CN CN 201110051127 patent/CN102135271B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5293841A (en) * | 1992-03-06 | 1994-03-15 | Gea Luftkuhler Gmbh | Arrangement for utilizing the heat contained in the exhaust gas of a coal-fired boiler |
| CN201184586Y (en) * | 2008-04-07 | 2009-01-21 | 江纯招 | Energy-saving and emission-reducing hot water tank for boiler |
| CN201251192Y (en) * | 2008-07-08 | 2009-06-03 | 李鸿飞 | Air-purifying, warming and discharged-waste-gas recovering device |
| CN101782274A (en) * | 2009-01-16 | 2010-07-21 | 夏嘉琪 | Heat energy recovering device for boiler tail gas |
| CN201407645Y (en) * | 2009-05-12 | 2010-02-17 | 南京加诺能源设备有限公司 | Radial heat pipe economizer |
| CN201462895U (en) * | 2009-07-01 | 2010-05-12 | 四平市东海石化设备制造有限公司 | Antiseptic wearable air pre-heater |
| CN201983250U (en) * | 2011-03-03 | 2011-09-21 | 上海阿波罗机械股份有限公司 | Flue gas residual heat recycling economizer of boiler wet desulphurization system |
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| CN102135271A (en) | 2011-07-27 |
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