CN205535772U - Circulating fluidized bed boiler external heat exchanger - Google Patents
Circulating fluidized bed boiler external heat exchanger Download PDFInfo
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- CN205535772U CN205535772U CN201620264431.3U CN201620264431U CN205535772U CN 205535772 U CN205535772 U CN 205535772U CN 201620264431 U CN201620264431 U CN 201620264431U CN 205535772 U CN205535772 U CN 205535772U
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Abstract
The utility model relates to a circulating fluidized bed boiler heat exchanger specifically discloses a circulating fluidized bed boiler external heat exchanger. Including the casing, casing one end is equipped with into hui kou, and the other end is equipped with the ash export, and the inside one end from entering ash mouthful one end to ash export place of casing is equipped with into huicang in proper order, advances grey storehouse partition wall, huicang, be equipped with heat exchange tube group in the ash storehouse, heat exchange tube group is including at least two sets of snakelike nests of tubes and at least one middle collection case of establishing ties each other, each is organized the snakelike nest of tubes and connects through middle collection case. The utility model has the advantages of: 1 )Reducing each nest of tubes and receiving the wall temperature of hot side poor, control receives the highest wall temperature of hot side at equitable within range, effectively prevents the high temperature booster, improves the stability and the security of external heat exchanger, 2 ) structural arrangement is more nimble, operating mode strong adaptability.
Description
Technical field
This utility model relates to a kind of CFBB auxiliary device, especially a kind of CFBB heat exchanger.
Background technology
For large-scale high parameter CFBB, because section of burner hearth increases, heating surface area increases, and heating surface can solve heating surface Layout Problem that heating surface increase brings and section of burner hearth increases the bed temperature problem rambunctious brought to use external heat exchanger to arrange.External heat exchanger is for arranging that the advantage of heating surface is: arranging of external heat exchanger can control bed temperature by the grey flow of regulation entrance external heat exchanger, regulation reheater side vapor (steam) temperature simultaneously.From the point of view of practice operation situation, the mode that large-scale high parameter recirculating fluidized bed uses external heat exchanger to control bed temperature and reheat steam temperature has fully demonstrated the advantage of this regulative mode.
Usual large-scale high parameter CFBB reheated steam overall temperature rise is the highest, supercritical circulating fluidized bed boiler reheated steam overall temperature rise about 250 DEG C, ultra supercritical CFBB reheated steam overall temperature rise reaches about 270 DEG C, and wherein the steam temperature rise of high temperature reheater is about about 80～100 DEG C.Only arranging one-level heating surface in general external heat exchanger, single-stage heating surface temperature rise is too high, inherently easily causes the temperature difference absolute value between heating surface bigger；Ash stream and is non-fully uniformly distributed in external heat exchanger simultaneously, and common distribution situation is that middle high both sides are low, and therefore middle heating surface heat absorption is stronger than the heat absorption of both sides heating surface.The harsh conditions that both the above factor has resulted in the highest wall temperature of high temperature reheater heating surface and minimum wall temperature differs greatly, high-grade metal material must be selected in the place that wall temperature is high, increase cost, even if selecting high-grade material, run and control also to be very careful, otherwise it is easy to overtemperature tube burst, reduces stability and the safety of high temperature reheater.
Ruuning situation according to Baima 600MW supercritical circulating fluidized bed boiler, high temperature reheater is arranged in external heat exchanger, steam temperature rise about 85 DEG C because of high temperature reheater, single-stage heating surface temperature rise, add the middle high both sides of ash stream distribution situation in external bed low, therefore the highest wall temperature of tube panel in the middle of differs bigger with the tube panel minimum wall temperature of both sides, the highest wall temperature reaches about 600 DEG C, easily cause the situation (alarm temperature 635 DEG C, high permission wall temperature 647 DEG C) of wall temperature overtemperature；And minimum wall temperature is less than 500 DEG C, differ about 100 DEG C with the highest wall temperature.Ruuning situation according to 300MW subcritical circulating fluidized bed boiler, the high temperature reheater heating surface being arranged in external heat exchanger, be perpendicular to the arrangement of ash flow direction because have employed coil heating surface, the highest near the tube panel wall temperature of ash inflow entrance, wall temperature is the lowest the most backward.Wall temperature is up to 598 DEG C (wall temperature alarm temperature 625 DEG C, high permission wall temperatures 649 DEG C), and minimum wall temperature only has 410 DEG C, differs nearly 200 DEG C.In both the above practical operation situation, under normality, the highest wall temperature has been sufficiently close to warning wall temperature, if occurring in running making a fault in accident or operating process, it is easy to cause overtemperature tube burst.This not only lowers operating environment adaptability and the operation stability of external heat exchanger, also considerably increase operation easier.And the highest wall temperature differs too big with minimum wall temperature, vapor (steam) temperature also differs too big, there is potential safety hazard.
Utility model content
For solving the above-mentioned problems in the prior art, this utility model provides a kind of External Heat Exchanger in CFB Boiler.
This utility model solves the technical scheme is that External Heat Exchanger in CFB Boiler of its technical problem, including housing, shell one end is provided with ash inlet, the other end is provided with ash outlet, enclosure interior is sequentially provided with into ash silo from ash inlet one end to the one end at ash outlet place, enters ash silo partition wall, ash silo, is provided with set of heat exchange tubes in described ash silo；Described set of heat exchange tubes includes at least two group coil groups and at least one intermediate header being serially connected, and described each group of coil group is connected by intermediate header.First coil group is its import header with the import header of heat exchanger, and last coil group is its outlet header with the outlet header of heat exchanger.
Single-stage heating surface of the prior art is actually divided into multistage heating surface by this utility model so that heat exchange completes to be divided into multistage completing from one-level.When heat exchange be one-level complete time, heating surface is continuous warming under the effect of ash stream, too high continuous warming easily causes obvious wall temperature difference, add high both sides in the middle of the distribution often in heat exchanger of the ash stream low, causing the continuous rapid increase of wall temperature of tube panel in the middle of coil group, both sides wall temperature the most slowly rises, and therefore temperature difference the most constantly expands, at the end of heat exchange, middle wall temperature has been significantly larger than the wall temperature of both sides.Coil group heating surface is divided at least two-stage by this utility model, thus heat exchange is divided into and repeatedly carries out, after often carrying out a heat exchange, after the steam with uniform temperature difference in each for coil group tube panel being sufficiently mixed by intermediate header, enter back into next stage coil group and carry out heat exchange, prevent the wall temperature difference cumulative bad of vapor (steam) temperature difference and each tube panel of coil group from expanding.And then improve stability and the safety that whole heat exchanger runs, effectively prevent the generation of high temperature booster.
As further improvement of the utility model, the structure of described intermediate header is, including the central exit header being connected to previous coil group steam (vapor) outlet end, being connected to central inlet header and the connecting tube of a rear coil group steam inlet end, described central exit header is connected by connecting tube with central inlet header.Use the intermediate header simple in construction of this structure, it is easier to manufacture.
As further improvement of the utility model, described set of heat exchange tubes includes two groups of coil groups and an intermediate header.Wall temperature difference and the highest wall temperature can be controlled in the range of reasonably by two-stage coil group, and structure is relatively simple, are beneficial to manufacture and promote, have the advantage of " the best price/performance ratio ".
As further improvement of the utility model, described each group of coil group is arranged side by side on the both sides of ash flow path direction.There is certain advantage in this arrangement: external heat exchanger shell length is short；Header is more preferably arranged, it is not necessary to through the air distribution plate bottom external heat exchanger.
As further improvement of the utility model, described each coil group is arranged before and after becoming along ash flow path direction.Grey temperature residing for this arrangement Low Temperature Steam district and high-temperature steam district is different, according to practical situation, the position interaction in Low Temperature Steam district and high-temperature steam district can being adjusted so that, the heat absorption of two groups of heating surfaces is in optimal matching status.As the further improvement of this technical scheme, between described each coil group, it is provided with ash silo partition wall.Ash silo partition wall can strengthen the boundary in high-temperature steam district and Low Temperature Steam district further, increases the grey temperature difference of different steam dome, is more conducive to by the position adjusting steam dome with the different operating mode of reply.
The beneficial effects of the utility model are: 1) reduce the wall temperature difference of each pipe group heating surface, control the highest wall temperature of heating surface in the reasonable scope, effectively prevent high temperature booster, improve stability and the safety of external heat exchanger；2) each group coil group tube panel can use and be perpendicular to ash flow path direction layout, it is possible to employing is parallel to ash flow path direction and arranges；Each group heating surface can be arranged in an ash silo, it is also possible to being arranged in two ash silos, structure is arranged more flexible；3) each coil group can be flowed to adjust mutually position by steam flow or ash according to actual requirement of engineering, is in optimal matching status realizing the heat absorption of each group of heating surface.
Accompanying drawing explanation
Fig. 1 is the top view that external heat exchanger coil group is arranged side by side on ash flow path direction both sides.
Fig. 2 is to arrange top view before and after external heat exchanger coil group becomes along ash flow path direction.
Fig. 3 is embodiment schematic diagram.
Fig. 4 is the top view of Fig. 3.
Being labeled as in figure: 1-housing, 2-enters ash silo, and 3-enters ash silo partition wall, 4-ash silo, 5-coil group, 6-intermediate header, 61-central exit header, 62-central inlet header, 63-connecting tube, 10-ash silo partition wall, 11-heat exchanger import header, 12-heat exchanger exit header, 51-the first coil group, 52-the second coil group.
Detailed description of the invention
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 2, Figure 3 and Figure 4, External Heat Exchanger in CFB Boiler, including housing 1, shell one end is provided with ash inlet, the other end be provided with ash outlet, enclosure interior from ash inlet one end to ash exit end be sequentially provided with into ash silo 2, enter ash silo partition wall 3, ash silo 4；Described ash silo 4 is provided with set of heat exchange tubes；Described set of heat exchange tubes includes the first coil group the 51, second coil group 52 and the intermediate header 6 being serially connected, and described two groups of coil groups are connected by intermediate header 6, and arranges before and after ash flow path direction, and is provided with ash silo partition wall 10 between two coil groups；Described intermediate header 6 includes the central inlet header 62 of central exit header 61, the second coil group of the first coil group and the connecting tube 63 being connected the two.
When this external heat exchanger works, steam introduces the first coil group from heat exchanger import header 11, steam in the first coil group after first time heat exchange, steam in different tube panels is provided with certain temperature difference with each tube wall, during in the most each tube panel, the steam of different temperatures flows into the central exit header 61 of the first coil group and mix, mixed steam flows through the central inlet header 62 of connecting tube the 63, second coil group successively；The steam of different temperatures elementary mixing is uniform during this period, form mutually synthermal steam stream, this steam stream separately flows in each tube panel of the second coil group, now the steam in the second each tube panel of coil group has identical temperature, again after second time heat exchange, i.e. can reach in prior art the heat transfer effect being carried out continuously a heat exchange.But classification heat exchange avoids and produces the bigger steam temperature difference and the tube wall temperature difference, reduces the highest wall temperature.
Simultaneously, ashes enter into ash silo 2 from ash inlet, climb over after ash silo partition wall 3, enter the first ash silo arranging the first coil group 51, climb over ash silo partition wall 10 after partial heat being passed to steam in the first ash silo again and enter the second ash silo arranging the second coil group 52, after needing the heat of transmission to pass to steam remainder in the second ash silo, just send external heat exchanger from ash outlet.
Claims (6)
1. External Heat Exchanger in CFB Boiler, including housing (1), shell one end is provided with ash inlet, the other end is provided with ash outlet, enclosure interior is sequentially provided with into ash silo (2) from ash inlet one end to the one end at ash outlet place, enters ash silo partition wall (3), ash silo (4), and described ash silo is provided with set of heat exchange tubes in (4)；It is characterized in that: described set of heat exchange tubes includes at least two groups coil group (5) and at least one intermediate header (6) being serially connected, described each group of coil group (5) is connected by intermediate header (6).
External Heat Exchanger in CFB Boiler the most according to claim 1, it is characterized in that: the structure of described intermediate header (6) is, including the central exit header (61) being connected to previous coil group steam (vapor) outlet end, the central inlet header (62) of a coil group steam inlet end and connecting tube (63) after being connected to, described central exit header (61) is connected by connecting tube (63) with central inlet header (62).
External Heat Exchanger in CFB Boiler the most according to claim 1, it is characterised in that: described set of heat exchange tubes includes two groups of coil groups (5) being serially connected and an intermediate header (6).
4. according to the External Heat Exchanger in CFB Boiler described in any claim in claims 1 to 3, it is characterised in that: described each group of coil group (5) is arranged side by side on the both sides of ash flow path direction.
5. according to the External Heat Exchanger in CFB Boiler described in any claim in claims 1 to 3, it is characterised in that: described each group of coil group (5) is arranged before and after becoming along ash flow path direction.
External Heat Exchanger in CFB Boiler the most according to claim 5, it is characterised in that: it is provided with ash silo partition wall (10) between described each coil group (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620264431.3U CN205535772U (en) | 2016-04-01 | 2016-04-01 | Circulating fluidized bed boiler external heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620264431.3U CN205535772U (en) | 2016-04-01 | 2016-04-01 | Circulating fluidized bed boiler external heat exchanger |
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| CN205535772U true CN205535772U (en) | 2016-08-31 |
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| CN201620264431.3U Active CN205535772U (en) | 2016-04-01 | 2016-04-01 | Circulating fluidized bed boiler external heat exchanger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426218A (en) * | 2020-04-13 | 2020-07-17 | 东方电气集团东方锅炉股份有限公司 | Supercritical carbon dioxide and solid particle heat exchanger |
| CN112709984A (en) * | 2020-12-30 | 2021-04-27 | 哈尔滨锅炉厂有限责任公司 | Novel external heat exchanger for CFB boiler |
-
2016
- 2016-04-01 CN CN201620264431.3U patent/CN205535772U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426218A (en) * | 2020-04-13 | 2020-07-17 | 东方电气集团东方锅炉股份有限公司 | Supercritical carbon dioxide and solid particle heat exchanger |
| CN112709984A (en) * | 2020-12-30 | 2021-04-27 | 哈尔滨锅炉厂有限责任公司 | Novel external heat exchanger for CFB boiler |
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