CN105650629B - A kind of method for eliminating external heat exchanger working medium thermal deviation - Google Patents
A kind of method for eliminating external heat exchanger working medium thermal deviation Download PDFInfo
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- CN105650629B CN105650629B CN201610102256.2A CN201610102256A CN105650629B CN 105650629 B CN105650629 B CN 105650629B CN 201610102256 A CN201610102256 A CN 201610102256A CN 105650629 B CN105650629 B CN 105650629B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
Abstract
The present invention relates to the external heat exchanger technical field of CFBB, purpose is to provide a kind of method for eliminating external heat exchanger working medium thermal deviation, the present invention is outward-dipping by the first side wall and the second side wall of the external heat exchanger housing, and the angle β with bottom surface air distribution plate extended surface is [30 90 °]；Enter the air quantity in putting in storage from the blast cap on the inner bottom surface air distribution plate of heating surface tube panel place storehouse to distribute from outside to inside successively by descending；And the means such as working medium that do not circulated in the internal heating surface pipe of region are kept away by not setting heating surface tube or the side in external heat exchanger Bian Bi areas, realize and eliminate thermal deviation.Technical scheme combination external heat exchanger actual operating data, pass through theoretical analysis and numerical method, side is effectively improved to keep away region fluid effect or avoid fluidizing defective region, external heat exchanger working medium thermal deviation is eliminated, is that the CFBB development of efficient ultra supercritical and above parameter lays the foundation.
Description
Technical field
The invention belongs to fluid bed technical field of power generation, and in particular to the external heat exchanger of large circulating fluidized bed boiler
Technical field.
Background technology
Combustion technology of circulating fluidized is a kind of novel clean coal combustion technology, and it is mainly characterized by fuel and is in burner hearth
Fluidize state burning.Combustion technology of circulating fluidized is worldwide obtained extensively with advantage of both its energy-conservation and environmental protection
Application.Ended for the end of the year 2015, the whole world has 9 supercritical circulating fluidized bed boilers and put into operation, and Combustion technology of circulating fluidized is
Through entering the overcritical epoch comprehensively.However, the plan in order to pursue higher generating efficiency and national energy-saving emission reduction, to active service
Requirement with the coal consumption of newly-built coal unit is more harsh, therefore, and CFBB is also just towards more high parameter, more great Rong
Even 700 DEG C parametric direction development of ultra supercritical, band double reheat of amount.
With the maximization of CFBB, it is available for the wall surface area for arranging heating surface to push the speed in burner hearth
It is unable to catch up with gathering way for boiler capacity so that arrange that enough heating surface difficulty are very big in main circulation loop.Therefore, Shandong
Very (Lurgi) company proposes the concept of external heat exchanger, using the high conduction coefficient of external heat exchanger, reduces heating surface consumption
Material, and hot and cold grey ratio in fluidized-bed combustion boiler outer circulation loop is controlled by mechanical valve, so as to adjust Temperature of Working and burner hearth
Bed temperature.Chinese invention patent if notification number is CN102353043B discloses a kind of adjustable external of CFBB
Heat exchanger, by adjusting the height of regulating valve flashboard above and below executing agency, realizes the purpose of the grey flow of control heat.
In addition to mechanical adjustment, also by the external heat exchanger of pneumatic control, most typically U.S. FW companies
Integrated returning charge heat exchanger (INTREX).The external heat exchanger of FW companies has three kinds of arrangements：Including " underflow type ", " overflow
Streaming " and independent arrangement.Being mainly characterized by of " underflow type " INTREX can not only be separated with cooling down high-temperature separator
High-temp circulating ash, can be with cooling segment furnace high-temperature bed；" overflow-type " INTREX is in structure by entering without heating surface
Material passage is constituted with the cooling chamber and a shared returning charge passage by heating surface, so that cold and hot grey ratio is controllable and makes returning charge
Temperature is uniform；Current FW overflow-type external heat exchanger and underflow type external heat exchanger is also often used cooperatively.Independent cloth
The mode of putting refers to that INTREX is independently arranged in outside stove, and this arrangement need to only control the Fluidization wind rate of cooling chamber just to can reach tune
The purpose of ash quantity is saved, but studies have found that its regulating power is relatively limited, mainly appears on the ciculation fluidized of FW companies relatively early stage
On bed boiler.
Publication No. CN101896768A Chinese patent integral waterwall external heat exchangers are by evaporating heating surface cloth
Put in external heat exchanger that there is provided the CFBB evaporating heating surface arrangement side of a kind of subcritical and following parameter
Formula；Publication No. CN203656914U Chinese patent external heat exchanger is mentioned the arranged direction of heating surface coiled pipe and Jie
Matter flow direction is parallel, so as to solve the problem of heated surface vibration and abrasion；Publication No. CN1558141A Chinese patent one
The air control formula material outside circulation device for planting CFBB proposes a kind of external heat exchanger of pneumatic control, so as to solve
The abrasion of mechanical adjustment valve and its high maintenance cost problem；Publication No. CN101694296A Chinese patent recirculating fluidized beds are oxygen-enriched
Combustion external formula heat exchanger heat exchanger proposes a kind of fluidized-bed combustion boiler external heat exchanger for oxygen-enriched combusting, will be burnt in burner hearth
Charcoal and desulfurizing agent, which are introduced in heat exchanger, carries out burning reinforcement heat transfer effect；Publication No. CN203571726U Chinese patent is external
Formula heat exchanger proposes the external heat exchanger using membrane wall structure cavity, is effectively reduced thickness of inner lining, and beneficial to increase
The Heat absorption fraction of external heat exchanger.However, above-mentioned technology does not consider the operation characteristic of external heat exchanger in itself, this is also
The direction that existing research and concern angle is generally short of.In fact, from the actual motion feelings of large circulating fluidized bed boiler
From the point of view of condition, there is certain deviation in the heating surface outlet Temperature of Working of external heat exchanger.In subcritical and following parameter, by
Enough, the problem is not highlighted hot face material nargin, and is to improve generating gross efficiency and further improve steam parameter
During to ultra supercritical, if the thermal deviation problem solution is bad, material selection will be caused difficult, finally make it that boiler scheme can not
Implement.
In order to solve the problems, such as external heat exchanger thermal deviation, Gas-solid Flow Characteristics in clear and definite external heat exchanger are needed.Research
Show, the Gas-solid Two-phase Flow in external heat exchanger belongs to bubbling fluidized bed category, but with traditional bubbling fluidized bed boiler
Flowing in stove has difference again.There is more significant difference in this particle diameter distribution for being primarily due to the two.Generally, external heat exchanger
An average grain diameter magnitude lower than particle diameter in conventional bubbling fluidized-bed combustion boiler stove in device, hence in so that in external heat exchanger
The agglomerating of particle, back-mixing and gas are difficult to reference to conventional bubbling fluidized bed pot to flow behaviors such as the towings and entrainment of particle
The corresponding knowledge of stove.Particularly the furnace height of large circulating fluidized bed boiler more than 50m after, can by gas carry secretly it is so far high
The grain diameter of degree level will further decrease, close to the particle diameter limit of B class particles in Geldart particle diameter distribution methods, therefore
It is difficult to directly apply existing bubbling bed experience.In addition, the direction of external heat exchanger internal heating surface and the main flow of ash particle flow
Direction is parallel, and this is again vertical with ash particle main flow direction from traditional bubbling bed pipe laying heating surface different, i.e., can not use for reference bubbling bed
The experience of pipe laying heating surface, therefore special calculating research can only be carried out.
Using external heat exchanger as research object, Gas-particle Flows in external heat exchanger are described using big whirlpool model, externally
Put gas-particle two-phase fluid in formula heat exchanger to be simulated, as a result as shown in Figure 1.As shown in Figure 1, in the storehouse of external heat exchanger second
Bottom surrounding granule density is far above central area, illustrates that side wall region is different from the grain fluidized characteristic in intermediate region；Pass it
Thermal effect is different from central area, ultimately results in working medium and there is thermal deviation.
External heat exchanger working medium thermal deviation is in the CFBB development process of ultra supercritical parameter and the above
Especially highlight so that the portions under heat face selection in external heat exchanger is difficult, limit CFBB towards
The direction of more high parameter more Large Copacity and higher efficiency is developed, and is difficult to the further raising of Circulating Fluidized Bed Boilers efficiency
Realize.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method for eliminating external heat exchanger working medium thermal deviation, come
The working medium thermal deviation of recirculating fluidized bed external heat exchanger is reduced, External Heat Exchanger in CFB Boiler outlet working medium is improved
The uniformity of parameter, makes CFBB realize more Large Copacity and higher efficiency.
The technical solution adopted for the present invention to solve the technical problems is：One kind eliminates external heat exchanger working medium thermal deviation
Method, the external heat exchanger includes housing, partition wall, heating surface tube panel, import header, outlet header, import grey-way, goes out
Mouth grey-way, air compartment, blast cap；The housing include along the front wall and rear wall in particle flow direction, the first side wall and the second side wall with
And top plate and bottom surface air distribution plate, the outlet grey-way is on wall after housing, and the blast cap is located on housing bottom surface air distribution plate；Institute
Air compartment is stated under the air distribution plate of bottom surface；Enclosure interior is divided at least two storehouses, the heating surface tube by the partition wall from front to back
Screen be arranged in the second storehouse and each later storehouse in, the pipe of the heating surface tube panel axially with to manage outer particle flow direction flat
OK, it is characterised in that：The first side wall and the second side wall of the external heat exchanger housing is outward-dipping, with bottom surface air distribution plate
The angle β of extended surface is 30 °≤β≤90 °；Blast cap where from heating surface tube panel on the inner bottom surface air distribution plate of storehouse enters the interior wind that puts in storage
Amount is distributed from outside to inside successively as descending.
It is preferred that, the different m kind blast caps of air quantity, its apoplexy are set on the bottom surface air distribution plate where heating surface tube panel in storehouse
Cap arranges that wherein m is the integer more than or equal to 2 by air quantity is descending from outside to inside successively.
It is preferred that, the different n classes region of percent opening is set on the bottom surface air distribution plate where heating surface tube panel in storehouse, it is described
N classes region arranges that wherein n is the integer more than or equal to 2 by percent opening is descending from outside to inside successively.
It is preferred that, the tube axis of the heating surface tube panel two sides respectively with the side wall of housing first and the second side wall distance
D≤L/4 region be side keep away region, it is described while keep away in region do not set heating surface tube panel pipe or it is described while keep away in region be heated
The pipe of facial canal screen does not circulate working medium；The L is bottom surface air distribution plate width.
It is preferred that, the pipe of heating surface tube panel uses x kind calibers, and the minimum pipe of caliber is placed in described side and keeps away region,
Remaining tubing presses the ascending arrangement successively from outside to inside of caliber, wherein the ratio between caliber minimum value and maximum 0.4-1 it
Between, wherein x is the integer more than or equal to 2.
It is preferred that, throttling arrangement is set on the heating surface tube panel, makes the mass flow of heating surface tube panel pipe most
The ratio between small value and maximum are between 0.5-1, and wherein the minimum pipe of working medium flow is placed in described side and keeps away region.
It is preferred that, the ratio between external heat exchanger outlet grey-way width and top plate width are 0.6~1.
The experiment that the present invention is carried out：
Using external heat exchanger as research object, external heat exchanger flow field is calculated from big whirlpool model, from classics
Combination Ergun and Wen-yu model Gidaspow drag force models describe between gas-solid momentum transmission, to external heat exchanger
Interior Gas-particle Flows are simulated, and result of calculation, should as shown in figure 1, as shown in Figure 1, the surrounding of fluid bed has boundary layer region
Fluid effect is poor in region so that submerges pipe heat transfer reduction therebetween, ultimately results in working medium side and there is thermal deviation.Therefore,
The present invention is outward-dipping by the first side wall and the second side wall of external heat exchanger so that heating surface tube panel be all located at boundary layer with
Outer region, as a result as shown in Figure 2.Realize that region goods fluid characteristic is kept away on improvement side by subregion cloth wind simultaneously, kept away on side
Arrangement air quantity bigger blast cap in region keeps away region on side using bigger percent opening, to strengthen the fluidisation that region is kept away on side.
In addition, by calculating, Bian Bi area sizes d can be obtained, and determine the folder of both walls and bottom surface air distribution plate extended surface
Angle beta is 30 °≤β≤90 °.Research shows that pipe laying has significant impact to bubbling bed bubbles burst etc. simultaneously.Therefore, in order to not
The pipe for destroying the heating surface tube panel that original flow field can keep away side in region does not circulate working medium, is changed to false tube.
In working medium side, because the import header caliber of heating surface tube panel will not generally change, hence in so that unilateral entrance
Working medium can when entering the pipe of heating surface tube panel, mass flow be gradually reduced with the progress of flowing, i.e. the work of heating surface tube panel
Mass flow amount is in itself there is also the situation of skewness, and due to structure and integral arrangement factor, heating surface tube panel imports and exports header mesh
Before can not use reducer pipe, and import and export header still can only one side pass in and out, therefore from different heating surface tube panel caliber or plus
If throttling arrangement solves working medium side deviation.From the result of calculation of actual bias property and flow deviation, heating surface is obtained finally
The ratio between tube panel caliber minimum value and maximum are 0.4-1；Or the minimum value and maximum of the mass flow of heating surface tube panel pipe
The ratio between when being 0.5-1, working medium flow distribution matches with the ash such as Gas-particle Flows, heat transfer side inhomogeneities, is more uniformly distributed.Lead to simultaneously
Cross and the Gas-solid Flow Characteristics under multi-state and typical power station External Heat Exchanger in CFB Boiler grain diameter calculated,
It was found that aforementioned proportion can cover existing main flow scope.According to result of calculation, the small heating surface pipe of flow is placed in and changed
In the poor side wall region of heat, i.e., by adjusting caliber or adding throttling arrangement to solve the problems, such as the thermal deviation of heating surface tube panel.
The beneficial effects of the invention are as follows：Technical scheme combination external heat exchanger actual operating data, passes through
Theoretical analysis and numerical method, external heat exchanger housing both walls are outward-dipping, and the angle β with bottom plate extended surface is 30 °
≤ β≤90 ° so that heating surface tube panel is located at beyond boundary layer, storehouse inner bottom surface air distribution plate is enterprising where from heating surface tube panel puts in storage
Interior air quantity is distributed from outside to inside successively as descending, by above-mentioned a variety of methods, is effectively improved side and is kept away region fluid effect
Or avoid fluidizing defective region, external heat exchanger working medium thermal deviation is eliminated, is the circulation of efficient ultra supercritical and above parameter
Fluidized-bed combustion boiler development lays the foundation.
Brief description of the drawings
Fig. 1 is that Gas-particle Flows result of calculation is illustrated in existing external heat exchanger；
Fig. 2 is Gas-solid Flow Characteristics of the present invention by external heat exchanger side wall after outward-dipping；
Fig. 3 is the structural front view of the embodiment of the present invention 1；
Fig. 4 is the schematic top plan view of the embodiment of the present invention 1；
Fig. 5 is the schematic side view of the embodiment of the present invention 1；
Fig. 6 is the structural front view of the embodiment of the present invention 2；
Fig. 7 is the structural side view of the embodiment of the present invention 2；
Fig. 8 is the structural side view of the embodiment of the present invention 3；
Marked in figure：1- housings, 2- heating surfaces tube panel, 3- imports grey-way, 4- outlet grey-way, 5- air compartments, 6- partition walls,
Wall, the side walls of 13- first, the side walls of 14- second, 15- top plates, 16- bottom surfaces air distribution plate, 21- imports header, 22- after 11- front walls, 12-
Peak width, β-the first sides are kept away in outlet header, L- bottom surfaces air distribution plate width, L1- top plates width, B- outlets grey-way width, d- sides
The angle of wall, the second side wall and bottom surface air distribution plate extended surface.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Embodiment 1：
As shown in Fig. 3, Fig. 4, Fig. 5, a kind of external heat exchanger for 660MW ultra supercritical CFBBs,
Including housing 1, partition wall 6, heating surface tube panel 2, import header 21, outlet header 22, import grey-way 3, outlet grey-way 4, air compartment 5,
Blast cap；Housing 1 includes the front wall 11 and rear wall 12, the first side wall 13 and the second side wall 14 and top plate 15 along particle flow direction
With bottom surface air distribution plate 16, the top plate width is L1, and the width of bottom surface air distribution plate 16 is L, and wherein L is according to heat exchange implement body mark
Quasi- design；The import header 21 and outlet grey-way 4 are located on the rear wall 12 of housing 1, and the outlet header 22 is pushed up positioned at housing 1
On plate 15, the import grey-way 3 is located on the side wall 14 of housing 1 second, and the air compartment 5 is located under the bottom surface air distribution plate 16 of housing 1；Bottom
Multiple blast caps are set on the air distribution plate of face；The partition wall 6 will be divided into the first storehouse, the second storehouse, heating surface tube from front to back inside housing 1
Screen 2 is arranged in the second storehouse along solid particle flow direction, and working medium enters heating surface tube panel from import header 21 during operation, through outer
Put after the heat exchange of formula heat exchanger, left by outlet header 22.The tube axis of heating surface tube panel 2 is parallel with particle flow direction, and two
Side wall is 90 ° with bottom surface air distribution plate extended surface angle β.
By calculating, peak width d is kept away for L/4 in the side of Gas-particle Flows in the external heat exchanger, therefore external heat exchanger
The outermost tube axis of the heating surface tube panel 2 of device is set to L/4 with the minimum range d of the side of housing 1.Where heating surface tube panel
Second storehouse is arranged in side wall region using the different blast cap of two kinds of air quantity, the blast cap of Wind Volume.Reduce different operating modes or use
The thermal deviation of the outlet working medium of external heat exchanger during Coal rank.
Heating surface tube panel adjusts mass flow, the ratio between pipe with small pipe diameter internal diameter and Large Diameter Pipeline internal diameter using 2 kinds of different calibers
For 0.44, and make pipe with small pipe diameter pipe be disposed adjacent to side to keep away region.Use and the bottom surface air distribution plate 16 of external heat exchanger housing 1 simultaneously
The equal width B of outlet grey-way 4 of width L, reduce further working medium thermal deviation.
Embodiment 2：
As shown in Figure 6, Figure 7, it is a kind of to be used for the external heat exchanger of 700 DEG C of parameter cyclic fluidized-bed combustion boilers, including housing
1st, partition wall 6, heating surface tube panel 2, import header 21, outlet header 22, import grey-way 3, outlet grey-way 4, air compartment 5, blast cap；Housing
1 is included along the front wall 11 and rear wall 12 in particle flow direction, the first side wall 13 and the second side wall 14 and top plate 15 and bottom surface cloth
Aerofoil 16, the top plate width is L1, and the width of bottom surface air distribution plate 16 is L, and the import header 21 and outlet grey-way 4 are located at
After housing 1 on wall 12, the outlet header 22 is located on the top plate 15 of housing 1, and the import grey-way 3 is located at the side wall of housing 1 second
Upper 14, the air compartment 5 is located under the bottom surface air distribution plate 16 of housing 1；Blast cap is set on the air distribution plate of bottom surface；The inner space quilt of housing 1
Partition wall 6 is divided into three storehouses, and heating surface tube panel 2 is arranged in the second storehouse and the 3rd storehouse along solid particle flow direction, described second
The import header 21 of storehouse heating surface tube panel is located on the top plate 15 of housing 1, the outlet header 22 of the second storehouse heating surface tube panel
In the bottom surface air distribution plate of housing 1 below 16, the import header 21 and outlet grey-way 4 of the 3rd storehouse heating surface tube panel are located at housing 1
Afterwards on wall 12, the outlet header 22 of the 3rd storehouse heating surface tube panel is located on the top plate 15 of housing 1, and the import grey-way 3 is located at
13 on the side wall of housing 1 first, working medium enters heating surface tube panel 2 from import header 21 during operation, after being exchanged heat through external heat exchanger,
Left by outlet header 22.The tube axis of heating surface tube panel 2 is parallel with particle flow direction.In the present embodiment, into following outside
The particle of loop back path is thicker, by initial analysis, and it is 75 ° to choose both walls with the extended surface angle β of bottom surface air distribution plate 16, so that by
Hot face will not be submerged in boundary layer.In order to reduce in different operating modes or external heat exchanger when using Coal rank as far as possible
The thermal deviation of working medium is exported, the two kinds of percent openings of setting of bottom surface air distribution plate 16 in the second storehouse, the 3rd storehouse where heating surface tube panel 2
The percent opening in region, wherein borderline region is more than the percent opening of central area.
By further numerical computations, peak width d is kept away for L/5 in the side of Gas-particle Flows in the external heat exchanger, on side
Do not circulate working medium in the pipe for keeping away the heating surface tube panel in region.
The pipe of heating surface tube panel adjusts mass flow, wherein pipe with small pipe diameter internal diameter and big pipe using 2 kinds of different calibers
The ratio between footpath internal diameter is 0.7.Throttling arrangement is provided with heating surface tube panel 2, makes the mass flow of the pipe of heating surface tube panel 2 most
The ratio between small value and maximum are 0.6, and the pipe for making flow small keeps away region close to side.The grey-way 4 of external heat exchanger outlet simultaneously
Width B and the width L1 of top plate 15 ratio are 0.8, approach the heating surface tube panel peak width of itself and external heat exchanger, so that
Further reduce working medium thermal deviation.
Embodiment 3：
As shown in figure 8, the embodiment is compared with embodiment two, its difference is：Both walls extend with bottom surface air distribution plate 16
Face angle β is 45 °, so as to arrange heating surface in wider array of space, while the external heat exchanger outlet width B of grey-way 4
Ratio with the width L1 of top plate 15 is 0.6, its width is fully covered the width of the heating surface tube panel of external heat exchanger, from
And reach the purpose of reduction working medium thermal deviation.
Claims (7)
1. a kind of method for eliminating external heat exchanger working medium thermal deviation, the external heat exchanger includes housing, partition wall, is heated
Facial canal screen, import header, outlet header, import grey-way, outlet grey-way, air compartment, blast cap；The housing is included along particle flow side
To front wall and rear wall, the first side wall and the second side wall and top plate and bottom surface air distribution plate, the outlet grey-way be located at housing after
On wall, the blast cap is located on housing bottom surface air distribution plate；The air compartment is located under the air distribution plate of bottom surface；The partition wall is by enclosure interior
Be divided at least two storehouses from front to back, the heating surface tube panel be arranged in the second storehouse and each later storehouse in, the heating surface
The pipe of tube panel is axially parallel with managing outer particle flow direction, it is characterised in that：By the first of the external heat exchanger housing
Side wall and the second side wall are outward-dipping, and the angle β with bottom surface air distribution plate extended surface is 30 °≤β≤90 °；From heating surface tube panel institute
Blast cap on the inner bottom surface air distribution plate of storehouse enter put in storage in air quantity distributed from outside to inside successively by descending.
2. a kind of method for eliminating external heat exchanger working medium thermal deviation according to claim 1, it is characterised in that：By
The different m kind blast caps of air quantity are set on the bottom surface air distribution plate where hot facial canal screen in storehouse, its Apoplexy cap by air quantity it is descending according to
Secondary to arrange from outside to inside, wherein m is the integer more than or equal to 2.
3. a kind of method for eliminating external heat exchanger working medium thermal deviation according to claim 1, it is characterised in that：By
The different n classes region of percent opening is set on the bottom surface air distribution plate where hot facial canal screen in storehouse, and the n classes region is by percent opening by big
Arranged from outside to inside successively to small, wherein n is the integer more than or equal to 2.
4. a kind of method of elimination external heat exchanger working medium thermal deviation according to any one of claim 1,2 or 3, its
It is characterised by：The tube axis of the heating surface tube panel two sides is respectively with the side wall of housing first and the second side wall apart from d≤L/4
Region keep away region for side, it is described while keep away in region do not set heating surface tube panel pipe or it is described while keep away region internal heating surface tube panel
Pipe do not circulate working medium；The L is bottom surface air distribution plate width.
5. a kind of method for eliminating external heat exchanger working medium thermal deviation according to claim 4, it is characterised in that：It is heated
The pipe of facial canal screen uses x kind calibers, and the minimum pipe of caliber is placed in described side and keeps away region, remaining tubing by caliber by it is small to
Arrangement greatly successively from outside to inside, wherein the ratio between caliber minimum value and maximum is between 0.4-1, and wherein x is more than or equal to 2
Integer.
6. a kind of method for eliminating external heat exchanger working medium thermal deviation according to claim 4, it is characterised in that：Institute
State and throttling arrangement is set on heating surface tube panel, the ratio between minimum value and maximum of the mass flow of heating surface tube panel pipe is existed
Between 0.5-1, wherein the minimum pipe of working medium flow is placed in described side and keeps away region.
7. a kind of method for eliminating external heat exchanger working medium thermal deviation according to claim 1, it is characterised in that：It is external
The ratio between formula heat exchanger exit grey-way width and top plate width are 0.6~1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107436105B (en) * | 2017-09-14 | 2019-07-05 | 重庆大学 | A kind of recirculating fluidized bed external heat exchanger improving Gas-particle Flows heat exchange uniformity |
| CN107830516B (en) * | 2017-10-27 | 2019-03-05 | 东方电气集团东方锅炉股份有限公司 | A kind of method for commissioning of supercritical circulating fluidized bed boiler external heat exchanger |
| CN111895390B (en) * | 2020-07-17 | 2022-05-31 | 东方电气集团东方锅炉股份有限公司 | Air distribution system of external heat exchanger of circulating fluidized bed boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000205507A (en) * | 1999-01-08 | 2000-07-25 | Babcock Hitachi Kk | Fluid mixer and boiler |
| CN1395061A (en) * | 2002-08-07 | 2003-02-05 | 上海电力学院 | Method for eliminating smoke speed deviation of horizontal flue of corner-fired boiler by using warped separation screen |
| CN102417290A (en) * | 2010-09-26 | 2012-04-18 | 伍捷申 | Heat storage-heat exchange combined glass tank furnace with high melting rate |
| CN102840576B (en) * | 2011-06-23 | 2016-03-02 | 中国科学院工程热物理研究所 | With the CFBB of independent medial-lateral circulating fluidized bed heat exchanger |
| CN104006371B (en) * | 2014-06-12 | 2016-01-20 | 常熟浦发热电能源有限公司 | Based on waste-heat recovery device and the exhaust heat recovering method of outlet fibre selection |
| CN204240346U (en) * | 2014-11-18 | 2015-04-01 | 国家电网公司 | Fluidized-bed combustion boiler external bed whirlwind fluidization system |
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