CN114562717A - Straight-flow coil pipe boiler structure - Google Patents
Straight-flow coil pipe boiler structure Download PDFInfo
- Publication number
- CN114562717A CN114562717A CN202210317426.4A CN202210317426A CN114562717A CN 114562717 A CN114562717 A CN 114562717A CN 202210317426 A CN202210317426 A CN 202210317426A CN 114562717 A CN114562717 A CN 114562717A
- Authority
- CN
- China
- Prior art keywords
- boiler
- heat exchanger
- external heat
- coil
- coil pipe
- 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.)
- Pending
Links
- 239000000779 smoke Substances 0.000 claims abstract description 27
- 210000000476 body water Anatomy 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 21
- 239000003546 flue gas Substances 0.000 description 21
- 239000000203 mixture Substances 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/26—Steam-separating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/04—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being spirally coiled
Abstract
The invention discloses a straight-flow coil boiler structure, and particularly relates to the technical field of straight-flow coil boilers, which comprises a boiler shell, wherein an inner coil and an outer coil are arranged in the boiler shell, the inner coil is arranged on the inner side of the outer coil, a boiler body water inlet connecting pipe is fixedly arranged at one end of the top of the outer coil, the boiler body water inlet connecting pipe is arranged in the boiler shell and extends out of one side of the boiler shell, a reducing connecting pipe is fixedly arranged between one end of the bottom of the inner coil and the other end of the bottom of the outer coil, the inner coil is communicated with the outer coil through the reducing connecting pipe, the reducing connecting pipe is arranged in the boiler shell, and an external heat exchanger is arranged at one side of the boiler shell. The invention changes the smoke flow of the direct current coil pipe, reduces the round trip times of the smoke in the boiler from three return trips to two return trips, and then is connected with the external heat exchanger, so that the total smoke flow resistance of the boiler system is reduced, in addition, the steam with high dryness can further absorb heat in the external heat exchanger, and the dryness of the steam can be further improved.
Description
Technical Field
The invention relates to the technical field of once-through coil boilers, in particular to a once-through coil boiler structure.
Background
The boiler is a device which utilizes various fuels, electricity or other energy sources to heat the contained liquid to certain parameters and provides heat energy in the form of externally output media, and is mainly used for thermal power stations, ships, locomotives and industrial and mining enterprises. The main working principle of the boiler is that heat energy released after fuel combustion or waste heat in industrial production is transferred to water in a container, so that the water reaches the required temperature or certain pressure of steam.
The boiler is operated simultaneously in the boiler and the furnace, after water enters the boiler, the boiler heating surface transfers the absorbed heat to water in the steam-water system, so that the water is heated into hot water with certain temperature and pressure or generated steam, and the hot water is led out for application. In the combustion equipment part, fuel is combusted to continuously release heat, high-temperature flue gas generated by combustion transfers the heat to a boiler heating surface through heat propagation, the temperature of the high-temperature flue gas is gradually reduced, and the high-temperature flue gas is finally discharged from a chimney.
The boiler can be divided into: a power station boiler: the boiler is used for a thermal power plant, and has the advantages of large capacity, high parameters, new technology and strict requirements; an industrial boiler: boilers for supplying steam or hot water in processes of textile, printing and dyeing, pharmacy, chemical industry, oil refining, paper making and the like, heating and refrigeration of various industrial productions; the life boiler: a boiler for providing low-parameter steam or hot water for various industrial and mining, enterprises and public institutions, hotels, service industries and the like; a special boiler: such as double-working-medium two-steam circulation boilers, nuclear fuels, ships, locomotives, waste liquid, waste heat, once-through boilers and the like.
At present, in order to reduce the volume of a boiler in the design of a flue gas three-return-stroke straight-flow coil boiler structure, a high flue gas flow velocity is generally selected, the defects of high flue gas flow resistance and high hearth back pressure exist, and if the flue gas flow velocity reaches more than 25m/s, the selection of a burner becomes difficult. In addition, when the dryness of the steam-water mixture in the coil pipe in the hearth is high, the second type of heat transfer deterioration can occur, so that the pipe wall is over-heated and burned out, and the service life of the boiler is influenced, so the dryness of the steam at the outlet of the boiler is only about 80 percent generally.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a straight-flow coil boiler structure, the round-trip times of the flue gas in the boiler are reduced from three return strokes to two return strokes by changing the flue gas flow of the straight-flow coil, and then an external heat exchanger is connected, so that the total flow resistance of the flue gas of the boiler system is reduced, in addition, high-dryness steam further absorbs heat in the external heat exchanger, and the dryness of the steam can be further improved.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a straight-flow coil pipe boiler structure, includes the boiler casing, inside inner coil pipe and the outer coil pipe of being equipped with of boiler casing, inner coil pipe establishes at outer coil pipe inboard, the fixed boiler body that is equipped with of outer coil pipe top one end is intake and is taken over, the boiler body is intake and is taken over and establish inside boiler casing and extend boiler casing one side, and the boiler body is intake and is taken over and be used for external feed pipe, the fixed reducing that is equipped with between inner coil pipe bottom one end and the outer coil pipe bottom other end is taken over, inner coil pipe and outer coil pipe are taken over the intercommunication through the reducing, and the reducing is taken over and is established inside the boiler casing, and rivers can be taken over along outer coil pipe, reducing and flow in the inner coil pipe, boiler casing one side is equipped with external heat exchanger for steam-water mixture and flue gas countercurrent flow heat transfer.
In a preferred embodiment, an insulating layer is fixedly arranged outside the boiler shell and used for insulating the interior of the boiler shell.
In a preferred embodiment, a furnace body steam outlet connecting pipe is fixedly arranged at the other end of the top of the inner coil pipe, and the furnace body steam outlet connecting pipe extends out of the rear side of the boiler shell and is used for discharging flue gas.
In a preferred embodiment, an external heat exchanger outlet header and an external heat exchanger inlet header are arranged in the external heat exchanger, wherein the external heat exchanger outlet header and the external heat exchanger inlet header are vertically distributed, one end of the external heat exchanger inlet header extends out of one side of the external heat exchanger close to the inner coil pipe, and the external heat exchanger outlet header extends out of one side of the external heat exchanger away from the inner coil pipe.
In a preferred embodiment, the furnace body steam outlet connecting pipe is connected with an external heat exchanger inlet header through a pipeline, and the external heat exchanger outlet header is connected with an external steam-water separator.
In a preferred embodiment, a furnace body smoke exhaust interface is fixedly communicated with one side of the boiler shell, the furnace body smoke exhaust interface is connected with a smoke inlet of the external heat exchanger, the furnace body smoke exhaust interface is arranged above a furnace body water inlet connecting pipe, and a smoke outlet of the external heat exchanger is connected with other tail heating surfaces.
The invention has the technical effects and advantages that:
1. the invention adopts a structure of flue gas two-return stroke and an external heat exchanger, and the flue gas resistance of a boiler system can be reduced by more than 500 Pa.
2. Because the third return flue gas flow is cancelled, the boiler shell is not in direct contact with the flue gas any more, the heat preservation thickness of the boiler body can be reduced, the temperature of the outer surface of the boiler body can be reduced to be very low, when the environmental temperature is low, the temperature can be easily reduced to be below 30 ℃, and the thermal efficiency of the boiler is improved.
3. After the steam-water mixture at the outlet of the furnace body is further heated in the external heat exchanger, the humidity of the discharged saturated steam can be as low as 7 percent, and the occurrence of heat transfer deterioration of the second type of the heat exchange tube can be avoided due to the very low volume heat load of the external heat exchanger.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a view showing the inner structure of a boiler casing according to the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2 according to the present invention;
fig. 4 is an internal structure view of the external heat exchanger according to the present invention.
The reference signs are: 1. an inner coil pipe; 2. an outer coil pipe; 3. a boiler housing; 4. a heat-insulating layer; 5. reducing connecting pipes; 6. a furnace body smoke exhaust interface; 7. an external heat exchanger; 8. an external heat exchanger outlet header; 9. an inlet header of the external heat exchanger; 10. a furnace body steam outlet connecting pipe; 11. a furnace body water inlet connecting pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawing 1 of the specification, the once-through coiled pipe boiler structure of the embodiment comprises a boiler shell 3, wherein an insulating layer 4 is fixedly arranged on the outer side of the boiler shell 3 and used for insulating the inside of the boiler shell 3.
Referring to the attached drawings 1-4 of the specification, boiler body 3 is inside to be equipped with interior coil pipe 1 and outer coil pipe 2, interior coil pipe 1 is established at outer coil pipe 2 inboardly, the fixed boiler body that is equipped with of 2 top one ends of outer coil pipe takes over 11 that intakes, boiler body intake is taken over 11 and is established inside boiler body 3 and extend boiler body 3 one side, fixed reducing takeover 5 that is equipped with between 1 bottom one end of interior coil pipe and the 2 bottom other ends of outer coil pipe, interior coil pipe 1 and outer coil pipe 2 are taken over 5 intercommunications through reducing, and reducing takeover 5 is established inside boiler body 3, the fixed boiler body steam outlet takeover 10 that is equipped with of the 1 top other end of interior coil pipe, boiler body steam outlet takeover 10 extends boiler body 3 rear sides.
The boiler comprises a boiler shell 3 and is characterized in that an external heat exchanger 7 is arranged on one side of the boiler shell 3, an external heat exchanger outlet header 8 and an external heat exchanger inlet header 9 are arranged in the external heat exchanger 7 and are distributed up and down, one end of the external heat exchanger inlet header 9 extends out of one side, close to an inner coil pipe 1, of the external heat exchanger 7, the external heat exchanger outlet header 8 extends out of one side, far away from the inner coil pipe 1, of the external heat exchanger 7, a boiler body steam outlet connecting pipe 10 is connected with the external heat exchanger inlet header 9 through a pipeline, the external heat exchanger outlet header 8 is connected with an external steam-water separator, and steam-water mixture in the external heat exchanger 7 and flue gas perform countercurrent heat exchange.
A furnace body smoke exhaust interface 6 is fixedly communicated with one side of the boiler shell 3, the furnace body smoke exhaust interface 6 is connected with a smoke inlet of an external heat exchanger 7, the furnace body smoke exhaust interface 6 is arranged above a furnace body water inlet connecting pipe 11, smoke coming out of the furnace body smoke exhaust interface 6 enters the external heat exchanger 7, and a smoke outlet of the external heat exchanger 7 is connected with other tail heating surfaces.
The implementation scenario is specifically as follows: the furnace body water inlet connecting pipe 11 is externally connected with a water supply pipe, water flows into the inner coil pipe 1 along the outer coil pipe 2 and the reducing connecting pipe 5, then a steam-water mixture is discharged through the furnace body steam outlet connecting pipe 10, and then the steam-water mixture enters the external heat exchanger 7 along the external heat exchanger inlet header 9;
the boiler shell 3 is tightly attached to the outer coil 2, smoke does not enter an annular channel between the outer coil 2 and the boiler shell 3 after coming out of the annular channel of the inner coil and the outer coil, but directly enters a furnace body smoke exhaust interface 6, the furnace body smoke exhaust interface 6 is connected with an external heat exchanger 7, the smoke at about 400 ℃ coming out of the furnace body smoke exhaust interface 6 enters the external heat exchanger 7, and a steam-water mixture in the external heat exchanger 7 performs countercurrent heat exchange with the smoke;
the invention adopts a structure of flue gas two-return stroke and external heat exchanger, the flue gas resistance of the boiler system can be reduced by more than 500 Pa;
because the third return flue gas flow is cancelled, the boiler shell is not in direct contact with the flue gas any more, the heat insulation thickness of the boiler body can be reduced, the temperature of the outer surface of the boiler body can be reduced to be very low, when the environmental temperature is low, the temperature can be easily reduced to be below 30 ℃, and the thermal efficiency of the boiler is improved;
after the steam-water mixture at the outlet of the furnace body is further heated in the external heat exchanger, the humidity of the discharged saturated steam can be as low as 7 percent, and the occurrence of heat transfer deterioration of the second type of the heat exchange tube can be avoided due to the very low volume heat load of the external heat exchanger.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a straight-flow coil pipe boiler structure, a serial communication port, including boiler casing (3), boiler casing (3) inside is equipped with interior coil pipe (1) and outer coil pipe (2), interior coil pipe (1) is established at outer coil pipe (2) inboardly, outer coil pipe (2) top one end is fixed to be equipped with the furnace body and to intake takeover (11), the furnace body is intake takeover (11) and is established in boiler casing (3) inside and extend boiler casing (3) one side, fixed reducing takeover (5) that is equipped with between interior coil pipe (1) bottom one end and outer coil pipe (2) the bottom other end, interior coil pipe (1) and outer coil pipe (2) are taken over (5) intercommunication through the reducing, and reducing takeover (5) are established inside boiler casing (3), boiler casing (3) one side is equipped with external heat exchanger (7).
2. The continuous-flow coil boiler structure according to claim 1, characterized in that the boiler housing (3) is fixed with an insulating layer (4) on the outside.
3. The once-through coil boiler structure according to claim 1, characterized in that the other end of the top of the inner coil (1) is fixedly provided with a boiler body steam outlet connection pipe (10), and the boiler body steam outlet connection pipe (10) extends out of the rear side of the boiler shell (3).
4. The once-through coil boiler structure according to claim 1, wherein an external heat exchanger outlet header (8) and an external heat exchanger inlet header (9) are arranged in the external heat exchanger (7) and distributed up and down, one end of the external heat exchanger inlet header (9) extends out of one side of the external heat exchanger (7) close to the inner coil (1), and the external heat exchanger outlet header (8) extends out of one side of the external heat exchanger (7) far away from the inner coil (1).
5. The once-through coil boiler structure according to claim 4, characterized in that the boiler body steam outlet connection pipe (10) is connected with an external heat exchanger inlet header (9) through a pipeline, and the external heat exchanger outlet header (8) is connected with an external steam-water separator.
6. The continuous coil boiler structure according to claim 1, characterized in that one side of the boiler shell (3) is fixedly communicated with a boiler body smoke exhaust interface (6), the boiler body smoke exhaust interface (6) is connected with a smoke inlet of the external heat exchanger (7), and the boiler body smoke exhaust interface (6) is arranged above the boiler body water inlet connecting pipe (11).
7. The continuous coil boiler structure according to claim 1, characterized in that the smoke outlet of the external heat exchanger (7) is connected to other tail heating surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210317426.4A CN114562717A (en) | 2022-03-28 | 2022-03-28 | Straight-flow coil pipe boiler structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210317426.4A CN114562717A (en) | 2022-03-28 | 2022-03-28 | Straight-flow coil pipe boiler structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114562717A true CN114562717A (en) | 2022-05-31 |
Family
ID=81719863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210317426.4A Pending CN114562717A (en) | 2022-03-28 | 2022-03-28 | Straight-flow coil pipe boiler structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114562717A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2302391Y (en) * | 1997-04-10 | 1998-12-30 | 初卫 | Raw oil heating stove |
| CN201412821Y (en) * | 2009-06-02 | 2010-02-24 | 北京安纳知能源技术有限公司 | Overheat steam injection boiler with non-desalted feed water |
| CN103512018A (en) * | 2013-09-25 | 2014-01-15 | 浙江力聚热水机有限公司 | Steam generator |
| CN104791748A (en) * | 2015-05-13 | 2015-07-22 | 哈尔滨工业大学 | Double-direct-current circulating fluidized bed steam injection boiler with buried pipes and evaporation coils |
| CN105299634A (en) * | 2015-11-25 | 2016-02-03 | 东方电气集团东方锅炉股份有限公司 | Supercritical circulating fluid bed boiler water wall having high flow stability under low load |
| CN207050223U (en) * | 2017-07-14 | 2018-02-27 | 四川竹根锅炉股份有限公司 | A kind of liquid phase gas vertical boiler of organic heat carrier |
| CN111765635A (en) * | 2020-07-29 | 2020-10-13 | 青岛法罗力暖通温控技术设备制造有限公司 | Energy-saving environment-friendly heat conduction oil boiler |
-
2022
- 2022-03-28 CN CN202210317426.4A patent/CN114562717A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2302391Y (en) * | 1997-04-10 | 1998-12-30 | 初卫 | Raw oil heating stove |
| CN201412821Y (en) * | 2009-06-02 | 2010-02-24 | 北京安纳知能源技术有限公司 | Overheat steam injection boiler with non-desalted feed water |
| CN103512018A (en) * | 2013-09-25 | 2014-01-15 | 浙江力聚热水机有限公司 | Steam generator |
| CN104791748A (en) * | 2015-05-13 | 2015-07-22 | 哈尔滨工业大学 | Double-direct-current circulating fluidized bed steam injection boiler with buried pipes and evaporation coils |
| CN105299634A (en) * | 2015-11-25 | 2016-02-03 | 东方电气集团东方锅炉股份有限公司 | Supercritical circulating fluid bed boiler water wall having high flow stability under low load |
| CN207050223U (en) * | 2017-07-14 | 2018-02-27 | 四川竹根锅炉股份有限公司 | A kind of liquid phase gas vertical boiler of organic heat carrier |
| CN111765635A (en) * | 2020-07-29 | 2020-10-13 | 青岛法罗力暖通温控技术设备制造有限公司 | Energy-saving environment-friendly heat conduction oil boiler |
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