CN204922961U - Many air distribution plates fluidized bed boiler of in -band replacement calorimeter - Google Patents
Many air distribution plates fluidized bed boiler of in -band replacement calorimeter Download PDFInfo
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- CN204922961U CN204922961U CN201520618850.8U CN201520618850U CN204922961U CN 204922961 U CN204922961 U CN 204922961U CN 201520618850 U CN201520618850 U CN 201520618850U CN 204922961 U CN204922961 U CN 204922961U
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Abstract
The utility model discloses a many air distribution plates fluidized bed boiler of in -band replacement calorimeter belongs to the boiler field, including the main air distribution plate that is located furnace bottom and the main plenum of below, and arrange in the vice bed air distribution plate of main air distribution plate top fluidized bed dense region furnace side and the vice bed plenum of below, separate through the midfeather between main air distribution plate and the vice bed air distribution plate, being equipped with between to the side of the midfeather of vice bed air distribution plate top and the furnace receives the hot side space, the midfeather lower part still is equipped with the intercommunication receives at hot side space and furnace fluidized bed dense region's circulation ash returning charge hole. The utility model discloses existing effect has remedied not the outband and has put a heavy handled defect of fluidized bed bed temperature of being heated, has overcome an external fluidized bed structure challenge that is heated again. Divide the change of structure through cloth in the simple stove, reach the purpose of bed temperature in the effective control stove.
Description
Technical field
The utility model belongs to field of boilers, the CFBB manufacture that to refer more particularly to coal, living beings, solid refuse etc. be fuel, and safe and efficient burning and combustion with reduced pollutants technical field.
Background technology
CFBB emulsion zone is as fuel primary zone, and combustion share is large, and heat release is many, but in order to avoid the wear problem of emulsion zone heating surface, has laid a large amount of low coefficient of heat transfer abrasionproof castable, caused emulsion zone heating surface to recept the caloric and be far smaller than thermal discharge.Emulsion zone heat mainly relies on stove Inner eycle material to take out of in a large number with sensible heat form, thus sets up the heat balance of emulsion zone in stove.Emulsion zone combustion heat release and heat export the foundation of equalization point, determine emulsion zone temperature height.Under high-load condition, volume of boiler thermic load increases, emulsion zone combustion heat release amount strengthens, but separator change is little, and emulsion zone heat cannot be taken away by boiler circulating ash in time, thus bed temperature is caused to continue to raise, add operation risk, simultaneously too high emulsion zone temperature is unfavorable for that NOx controls and desulfuration in furnace reaction, causes that NOx emission is high, desulfuration efficiency is low, reduction Boiler Economical Operation and the feature of environmental protection.
Engineering experience shows: arrange that the heating surface of some effectively can reduce feed back ash temperature at CFBB ash closed circuit, and by regulating low temperature feed back ash quantity effectively can regulate bed temperature, some engineering adopts below separator, arranges that the mode of external heat exchanger is to regulate operation bed temperature at present, but this technical pattern is complicated, initial cost is high, maintenance cost is high, and adds runing adjustment difficulty.
Utility model content
The utility model is intended to solve Circulating Fluidized Bed Temperature modulability problem, and under improving different load, when difference enters stove fuel, fluidized-bed combustion boiler runs reliability and the controllability of bed temperature, increases security and the economy of boiler operatiopn.The distribution of circulating fluid bed boiler combustion share and the distribution of heating surface Heat absorption fraction play decisive role for bed temperature.The distribution of stove combustion share depends primarily on fuel combustion characteristics and in-furnace temperature field distribution, and Heat absorption fraction is mainly subject to stove internal heating surface and arranges and Dual-Phrase Distribution of Gas olid flow, but the arrangement of Boiler Furnace internal heating surface is fixed during boiler design.Just because of this, same CFBB is when using the different fuel of combustion characteristics, and emulsion zone bed temperature has very large difference, during burning same fuel, under different load condition, the change of emulsion zone bed temperature also comparatively greatly, and shortage regulating measure.
For this problem, external heat exchanger arises at the historic moment, and by arranging heating surface at the outer grey closed circuit of boiler, by regulating the ash quantity by external heating surface, indirectly reaching the object regulating emulsion zone heating surface caloric receptivity, thus effectively regulating bed temperature.But along with the continuous increase of boiler controller system load, cyclone separator quantity is also along with increasing, and corresponding external heat exchanger quantity also increases, and adds complexity and the risk of boiler composition and boiler operatiopn, reduce boiler overall operation reliability.
The utility model both effectively compensate for is not with external heating surface fluidized bed temperature to be difficult to control defect, overcomes again external heating surface fluidized-bed structure challenge.By the change of cloth separation structure in simple stove, reach the object effectively controlling bed temperature in stove.
The utility model object is realized by following technical proposals:
A kind of many air distribution plates fluidized-bed combustion boiler with built-in heat exchanger, comprise the main air distribution plate and main air room thereof that are positioned at burner hearth fluid bed emulsion zone, and be arranged in the secondary bed air distribution plate of fluid bed emulsion zone burner hearth side above described main air distribution plate and secondary bed air compartment thereof, separated by midfeather between described main air distribution plate and secondary bed air distribution plate, midfeather above described secondary bed air distribution plate and be provided with heating surface space between burner hearth side, described midfeather bottom is also provided with the circulating ash returning charge hole being communicated with described heating surface space and burner hearth fluid bed emulsion zone.
As selection, described heating surface space comprises and is arranged in water-cooled between midfeather above described secondary bed air distribution plate and burner hearth side or vapour cold heat exchanger.
As selection, described main air distribution plate is positioned at burner hearth bottom.
As selection, described secondary bed air distribution plate adopts fluidizing velocity lower than the bubbling bed of main air distribution plate.
As selection, described midfeather, secondary bed air distribution plate and burner hearth side form nearly U-shaped structure.
As selection, described secondary bed air distribution plate is arranged in that boiler is forward and backward, a place in side wall or many places.
As selection, described main air room and secondary bed air compartment lay respectively at below main air distribution plate and secondary bed air distribution plate.
The main scheme of aforementioned the utility model and each further selection scheme thereof can independent assortment to form multiple scheme; be the utility model can adopt and claimed scheme: as the utility model; each selection can select any combination with other; those skilled in the art can understand there is multiple combination according to prior art and common practise after understanding the utility model scheme; be the claimed technical scheme of the utility model, do not do exhaustive at this.
The course of work is: in order to effectively control fluid bed furnace combustion temperature, increases endotherm area in stove, and improve the flexible adjustment of emulsion zone bed temperature and main vapour, reheat steam temperature, the utility model arranges heat-transfer surface in right amount in stove.The utility model arranges multiple air compartment (main air room and secondary bed air compartment) at burner hearth diverse location (highly), and air distribution plate is divided into multiple different air distribution plate region (main air distribution plate and secondary bed air distribution plate), adopt midfeather separately.Above the secondary bed air distribution plate of burner hearth both sides (or surrounding), in bed, certain heating surface is set, in heating surface, adopts water-cooled or the cold mode of vapour to cool.Middle main air distribution plate is fuel primary zone, adopt high wind speed fluidized bed combustion mode, around secondary bed air distribution plate arranges separately secondary bed air compartment, and adopt bubbling bed mode to increase the mobility of circulating ash, circulating ash is effectively regulated to flow through the flux of circulating ash returning charge mouth by regulating Fluidization wind rate, thus regulate the cold ash quantity flowing into middle primary zone, the caloric receptivity of indirect regulation main combustion chamber emulsion zone, reach the object regulating emulsion zone temperature and vapor (steam) temperature.
The beneficial effects of the utility model:
1. boiler bed temperature modulability strengthens, and CFBB safety in operation and pollutant emission performance will be improved.CFBB many employings desulfuration in furnace, show according to domestic and international correlative study, desulfuration in furnace reacts best bed temperature at about 850 DEG C, and NOx emission can raise along with bed temperature and increase, stove combustion needs certain ignition temperature, so conservative control in-furnace temperature runs very crucial for CFBB.
2. reduce boiler manufacture cost, do not need external heat exchanger and high temperature ash control valve, boiler regulates flexible and convenient more, and operational reliability is high.
Accompanying drawing explanation
Fig. 1 is structure and the in-furnace dust circulation process schematic diagram of the utility model embodiment;
Fig. 2 is the midfeather structural representation of the utility model embodiment;
Wherein 1. sticking wall flow ash flow field in-stove, 2.-midfeather, 3.-water-cooled, vapour cold heat exchanger, 4.-secondary bed air distribution plate, 5.-secondary bed air compartment, 6.-main combustion chamber emulsion zone, 7.-main air distribution plate, 8.-main air room, 9.-circulating ash returning charge hole.
Detailed description of the invention
Following non-limiting examples is for illustration of the utility model.
Shown in figure 1,2, in Fig. 1, black box represents boiler setting, arrow is in-furnace dust flowing signal, the utility model the main air distribution plate of burner hearth 7. both sides, top (or surrounding) certain position the secondary bed air distribution plate of certain limit is set respectively 4., and water-cooled or vapour cold heat exchanger are set on secondary bed air distribution plate plate top 3., main air room and secondary bed air compartment is arranged respectively 5. 8. below major-minor bed, and adopting different cloth wind wind speed, 4. 7. main air distribution plate adopt midfeather 2. to separate in centre with secondary bed air distribution plate.In-furnace dust circulation process schematic diagram as shown in Figure 1, in running, the landing of burner hearth Inner eycle ash sticking wall flow is to secondary bed top, a part through water-cooled or vapour cold heat exchanger 3., 9. main combustion chamber emulsion zone is flowed in stove 6. by the circulating ash returning charge mouth of midfeather 2. bottom, 3. this part ash heat is absorbed by water-cooled or vapour cold heat exchanger, and is cooled.6. (mobility status as shown by arrows in FIG.) 3. without water-cooled or vapour cold heat exchanger 3. other, then overflow to main combustion zone in top in water-cooled or vapour cold heat exchanger.By regulating secondary bed air distribution plate 4. cloth wind wind speed, the share by heating surface ash and overflow ash effectively can be controlled.Thus the caloric receptivity of indirect regulation burner hearth emulsion zone, reach the object controlling bed temperature.The low wind speed bubbling bed that secondary bed heating surface region adopts, can effectively keep from heat surface wear problem.The utility model overcomes the baroque shortcoming of external heat exchanger, and heating surface is built-in, makes boiler overall compact, avoids unnecessary structure, saves boiler cost.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. the many air distribution plates fluidized-bed combustion boiler with built-in heat exchanger, it is characterized in that: comprise the main air distribution plate and main air room thereof that are positioned at burner hearth fluid bed emulsion zone, and be arranged in the secondary bed air distribution plate of fluid bed emulsion zone burner hearth side above described main air distribution plate and secondary bed air compartment thereof, separated by midfeather between described main air distribution plate and secondary bed air distribution plate, midfeather above described secondary bed air distribution plate and be provided with heating surface space between burner hearth side, described midfeather bottom is also provided with the circulating ash returning charge hole being communicated with described heating surface space and burner hearth fluid bed emulsion zone.
2. many air distribution plates fluidized-bed combustion boiler of band built-in heat exchanger as claimed in claim 1, is characterized in that: described heating surface space comprises and is arranged in water-cooled between midfeather above described secondary bed air distribution plate and burner hearth side or vapour cold heat exchanger.
3. many air distribution plates fluidized-bed combustion boiler of band built-in heat exchanger as claimed in claim 1, is characterized in that: described main air distribution plate is positioned at burner hearth bottom.
4. many air distribution plates fluidized-bed combustion boiler of band built-in heat exchanger as claimed in claim 1, is characterized in that: described secondary bed air distribution plate adopts fluidizing velocity lower than the bubbling bed of main air distribution plate.
5. many air distribution plates fluidized-bed combustion boiler of band built-in heat exchanger as claimed in claim 1, is characterized in that: described midfeather, secondary bed air distribution plate and burner hearth side form nearly U-shaped structure.
6. many air distribution plates fluidized-bed combustion boiler of band built-in heat exchanger as claimed in claim 1, is characterized in that: described secondary bed air distribution plate is arranged in that boiler is forward and backward, a place in side wall or many places.
7. many air distribution plates fluidized-bed combustion boiler of band built-in heat exchanger as claimed in claim 1, is characterized in that: described main air room and secondary bed air compartment lay respectively at below main air distribution plate and secondary bed air distribution plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618850.8U CN204922961U (en) | 2015-08-14 | 2015-08-14 | Many air distribution plates fluidized bed boiler of in -band replacement calorimeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618850.8U CN204922961U (en) | 2015-08-14 | 2015-08-14 | Many air distribution plates fluidized bed boiler of in -band replacement calorimeter |
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| CN204922961U true CN204922961U (en) | 2015-12-30 |
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| CN201520618850.8U Active CN204922961U (en) | 2015-08-14 | 2015-08-14 | Many air distribution plates fluidized bed boiler of in -band replacement calorimeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838889A (en) * | 2017-02-09 | 2017-06-13 | 重庆大学 | A kind of CFBB with interior circulation ash heat exchanger |
| CN107490003A (en) * | 2016-06-13 | 2017-12-19 | 巴布考克及威尔考克斯公司 | The CFBB of bed inside heat exchanger with bottom support |
| CN109058977A (en) * | 2018-06-15 | 2018-12-21 | 中国人民解放军国防科技大学 | Double-combustion-chamber device for combustion of aluminum particles and water |
-
2015
- 2015-08-14 CN CN201520618850.8U patent/CN204922961U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490003A (en) * | 2016-06-13 | 2017-12-19 | 巴布考克及威尔考克斯公司 | The CFBB of bed inside heat exchanger with bottom support |
| CN106838889A (en) * | 2017-02-09 | 2017-06-13 | 重庆大学 | A kind of CFBB with interior circulation ash heat exchanger |
| CN109058977A (en) * | 2018-06-15 | 2018-12-21 | 中国人民解放军国防科技大学 | Double-combustion-chamber device for combustion of aluminum particles and water |
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