CN201954534U - Extension heated type hearth of biomass circulating fluidized bed boiler - Google Patents
Extension heated type hearth of biomass circulating fluidized bed boiler Download PDFInfo
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- CN201954534U CN201954534U CN201120056474XU CN201120056474U CN201954534U CN 201954534 U CN201954534 U CN 201954534U CN 201120056474X U CN201120056474X U CN 201120056474XU CN 201120056474 U CN201120056474 U CN 201120056474U CN 201954534 U CN201954534 U CN 201954534U
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Abstract
The utility model discloses an extension heated type hearth of a biomass circulating fluidized bed boiler. The extension heated type hearth comprises a hearth water-cooling wall with a membrane-type structure, the inner-cavity wall surface of the hearth water-cooling wall is embedded with a plurality of groups of extension water-cooling walls at intervals, the extension water-cooling walls are vertical to the inner-cavity wall surface of the hearth water-cooling wall and are of the membrane-type structure as well, each extension water-cooling wall comprises a plurality of parallel heated pipes which are mutually in seamless connection through flat bars, the upper ends and the lower ends of the heated pipes are respectively communicated with an upper outlet header and a lower inlet header through connection pipe systems, the upper outlet header is connected with an input end of a boiler steam drum through an extraction pipe, the lower inlet header is connected with an output end of the boiler steam drum through a downcomer, and thus, a cooling water circulating loop of the extension water-cooling walls is formed. The extension heated type hearth has the advantages of simple structure and low cost, and can be used for effectively increasing a heated area in a hearth area on the premise of not changing the contour dimension of the hearth of the boiler, and obviously inhibiting or retarding local high temperature and coking phenomena easily occurring in the hearth area so as to ensure the long-term, stable and efficient operation of the boiler.
Description
Technical field
The utility model relates to generating power with biomass combustion equipment, refers to that particularly a kind of biomass circulating fluid bed boiler extension is subjected to the hot type burner hearth.
Background technology
Along with society growing to energy demand, as the fossil fuel in main energy sources source in rapid minimizing.Therefore, seek the focus that a kind of reproducible alternative energy source has become social common concern, wherein the less biomass fuel generating of environmental pollution has obtained using widely.Available biomass fuel mainly contains various agricultural wastes such as rice husk, all kinds of agricultural crop straws etc., and forestry waste such as branch bavin, tree root, waste and old wood and leftover pieces etc. are also arranged.These biomass fuels have common ground: the one, and its combustible basis fugitive constituent is very high, and quite a few catches fire in the stove and burns rapidly more than 80%, easily in the concentrated combustion of burner hearth regional area, causes this regional flue-gas temperature higher; The 2nd, the grey proportion that burning is produced is little, fusing point is low, have certain caking property, and the caking property of the high more flying dust of temperature is strong more.Like this, when biomass boiler moves, be prone to localized hyperthermia and coking phenomenon in the burner hearth, these characteristics need give enough attention in the boiler design process.
At present, generating power with biomass combustion equipment adopts biomass circulating fluid bed boiler mostly, and based on above-mentioned cause, the circulating ratio of this CFBB is generally lower, and the whole coefficient of heat transfer is less in the burner hearth, and the temperature of furnace outlet flue gas can not be too high.Therefore, when this type of boiler of design, require its furnace water cooling wall part that bigger heating surface area must be arranged, also need to control the flue-gas temperature in burner hearth combustion centre zone simultaneously.Design routinely, the existing long-pending mode of furnace wall cooling surface that increases mainly contains two kinds:
One strengthens burner hearth appearance and size.This measure not only can increase the manufacturing cost of boiler furnace self, and the global design that also can influence boiler is arranged, further strengthens the manufacturing cost of parts such as boiler structure.Simultaneously, this measure is very limited to the effect that reduces burner hearth burning concentrated area flue-gas temperature.
Its two, arrange the branch shield that is heated in the burner hearth.Mainly contain full separation heating screen and half point every two kinds of heating screens.Because the ash concentration in the burner hearth is higher, it is more serious to separate the wearing and tearing of heating screen when operation entirely, and boiler design is arranged more complicated.Though half point can be controlled flue gas temperature of hearth outlet every heating screen, but can't reduce the flue-gas temperature of burner hearth burning concentrated area, and half point mostly is the independent or semi-independent structure that is suspended on the boiler structure every heating screen, and the erecting by overhang that is increased will inevitably increase the production and the operating cost of boiler.
Summary of the invention
The purpose of this utility model is exactly will provide a kind of biomass circulating fluid bed boiler that can effectively increase burner hearth zone heating surface area under the prerequisite that does not change boiler furnace appearance and size to extend to be subjected to the hot type burner hearth, it is simple in structure, with low cost, can obviously suppress or slow down localized hyperthermia and the coking phenomenon that biomass circulating fluid bed boiler furnace zone is prone to, and guarantees boiler efficient operation steady in a long-term.
For achieving the above object, the designed biomass circulating fluid bed boiler extension of the utility model is subjected to the hot type burner hearth, the furnace wall cooling that comprises the membrane type structure, embedding at interval on the inner chamber wall of described furnace wall cooling has some groups to be the extension water-cooling wall that is arranged vertically and is similarly the membrane type structure with it, described extension water-cooling wall comprises the some heat pipes that are arranged in juxtaposition, between the described heat pipe by flat seamless link, on the described heat pipe, following two ends are communicated with top outlet collection case and lower inlet collection case respectively by connecting piping, described top outlet collection case and lower inlet collection case are installed on the burner hearth bracing frame, described top outlet collection case links to each other with the input of boiler-steam dome by fairlead, described lower inlet collection case links to each other with the output of boiler-steam dome by down-comer, thereby constitutes the cooling water circulation loop that extends water-cooling wall.
Advantage of the present utility model is mainly reflected in following several respects: one, extension water-cooling wall with independent loops loop has significantly improved the heating surface area of furnace wall cooling under the constant prerequisite of furnace cavity, thereby effectively reduce the burner hearth cavity temperature, particularly suppressed localized hyperthermia and coking phenomenon.They are two years old, the damascene structures that extends water-cooling wall has carried out cutting apart of certain zone with furnace wall cooling surface, in this zone as when coking phenomenon occurring, to the expansion of coking with spread and played effective restriction, improved the stability of biomass circulating fluid bed boiler operatiopn.Its three, extend the simple in structure, easy for installation of water-cooling wall, need not extra erecting by overhang, boiler design is arranged also there is not too many restriction, thereby can reduce the production cost of investment of boiler as far as possible.
Description of drawings
Fig. 1 extends the structural representation that is subjected to the hot type burner hearth for a kind of biomass circulating fluid bed boiler.
Fig. 2 is the A-A sectional structure schematic diagram among Fig. 1.
Fig. 3 is the I portion structure for amplifying schematic diagram among Fig. 1.
Fig. 4 is the II portion structure for amplifying schematic diagram among Fig. 2.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Biomass circulating fluid bed boiler extension shown in the figure is subjected to the hot type burner hearth, comprise the furnace wall cooling 7 of enclosing obturator on four sides and adopting conventional membrane type structure, embedding at interval on the inner chamber wall of furnace wall cooling 7 has some groups to be the extension water-cooling wall 1 that is arranged vertically and is similarly the membrane type structure with it, extends heat pipe (claiming to allow pipe again) adjacent on water-cooling wall 1 and the furnace wall cooling 7 and welds and help the membrane type structure.
Extend water-cooling wall 1 and comprise the some heat pipes that are arranged in juxtaposition 5, between the heat pipe 5 by flat 6 seamless link.The design height of heat pipe 5 and quantity can be selected on demand flexibly, general every group of extension water-cooling wall 1 is made of 3～5 heat pipes that are arranged in juxtaposition 5 and seamless flat 6 of being welded between them, every group of aspect ratio of extending water-cooling wall 1 and furnace wall cooling 7 is controlled in 1/4～1/2 the number range, its embedded location more options are prone to the zone of overtemperature in furnace wall cooling 7 inner chambers, concentrate the zone that enters as burner hearth secondary wind, can strengthen the heat absorption in this zone like this, avoid occurring localized hyperthermia's phenomenon, reduce the probability of burner hearth coking.
Top outlet collection case 2 and lower inlet collection case 3 are fixedly mounted on the burner hearth bracing frame.Top outlet collection case 2 links to each other with the input of boiler-steam dome 9 by fairlead 8, and the steam water interface that is produced is transported in the boiler-steam dome 9; Lower inlet collection case 3 links to each other with the output of boiler-steam dome 9 by down-comer 10, and the water in the boiler-steam dome 9 is turned back in the lower inlet collection case 3, extends independently cooling water circulation loop of water-cooling wall 1 thereby constitute.
During the utility model work, extend the heat that water-cooling wall 1 can effectively absorb the burner hearth high-temperature area, localized hyperthermia and the coking phenomenon that is prone in the burner hearth there is obvious control and slows down effect, both improve the stability of biomass circulating fluid bed boiler operatiopn, can significantly reduce the production and the operating cost of boiler again.
Claims (5)
1. a biomass circulating fluid bed boiler extension is subjected to the hot type burner hearth, the furnace wall cooling (7) that comprises the membrane type structure, it is characterized in that: embedding at interval on the inner chamber wall of described furnace wall cooling (7) has some groups to be the extension water-cooling wall (1) that is arranged vertically and is similarly the membrane type structure with it, described extension water-cooling wall (1) comprises the some heat pipes that are arranged in juxtaposition (5), between the described heat pipe (5) by flat (6) seamless link, on the described heat pipe (5), following two ends are communicated with top outlet collection case (2) and lower inlet collection case (3) respectively by connecting piping, described top outlet collection case (2) and lower inlet collection case (3) are installed on the burner hearth bracing frame, described top outlet collection case (2) links to each other with the input of boiler-steam dome (9) by fairlead (8), described lower inlet collection case (3) links to each other with the output of boiler-steam dome (9) by down-comer (10), thereby constitutes the cooling water circulation loop that extends water-cooling wall (1).
2. biomass circulating fluid bed boiler extension according to claim 1 is subjected to the hot type burner hearth, it is characterized in that: heat pipe (5) upper/lower terminal of described extension water-cooling wall (1) connects the piping place and is provided with the seal casing (4) that is used for furnace wall cooling (7) sealing.
3. biomass circulating fluid bed boiler according to claim 1 and 2 extends and is subjected to the hot type burner hearth, it is characterized in that: described extension water-cooling wall (1) is made of 3～5 heat pipes that are arranged in juxtaposition (5) and flat (6) seamless link being arranged between them.
4. biomass circulating fluid bed boiler extension according to claim 1 and 2 is subjected to the hot type burner hearth, it is characterized in that: described extension water-cooling wall (1) is 1/4～1/2 with the aspect ratio of furnace wall cooling (7).
5. biomass circulating fluid bed boiler extension according to claim 3 is subjected to the hot type burner hearth, it is characterized in that: described extension water-cooling wall (1) is 1/4～1/2 with the aspect ratio of furnace wall cooling (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120056474XU CN201954534U (en) | 2011-03-07 | 2011-03-07 | Extension heated type hearth of biomass circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120056474XU CN201954534U (en) | 2011-03-07 | 2011-03-07 | Extension heated type hearth of biomass circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201954534U true CN201954534U (en) | 2011-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120056474XU Expired - Lifetime CN201954534U (en) | 2011-03-07 | 2011-03-07 | Extension heated type hearth of biomass circulating fluidized bed boiler |
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| CN (1) | CN201954534U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103216822A (en) * | 2012-01-19 | 2013-07-24 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler having water cooling reinforcement structure |
| CN105588121A (en) * | 2016-01-26 | 2016-05-18 | 山西国峰煤电有限责任公司 | Hearth temperature water-cooling control device for large circulating fluidized bed boiler |
| CN113864757A (en) * | 2021-10-19 | 2021-12-31 | 西安热工研究院有限公司 | Boiler with built-in water-cooled wall |
-
2011
- 2011-03-07 CN CN201120056474XU patent/CN201954534U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103216822A (en) * | 2012-01-19 | 2013-07-24 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler having water cooling reinforcement structure |
| CN105588121A (en) * | 2016-01-26 | 2016-05-18 | 山西国峰煤电有限责任公司 | Hearth temperature water-cooling control device for large circulating fluidized bed boiler |
| CN113864757A (en) * | 2021-10-19 | 2021-12-31 | 西安热工研究院有限公司 | Boiler with built-in water-cooled wall |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110831 |
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| CX01 | Expiry of patent term |