CN105805735B - The supercritical circulating fluidized bed boiler and back-end ductwork of tail extended surface - Google Patents
The supercritical circulating fluidized bed boiler and back-end ductwork of tail extended surface Download PDFInfo
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- CN105805735B CN105805735B CN201410854456.4A CN201410854456A CN105805735B CN 105805735 B CN105805735 B CN 105805735B CN 201410854456 A CN201410854456 A CN 201410854456A CN 105805735 B CN105805735 B CN 105805735B
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Abstract
The present invention relates to the supercritical circulating fluidized bed boiler of tail extended surface, including：Burner hearth is disposed with furnace wall cooling in burner hearth；Gas-solid separator；Material returning device；And back-end ductwork, the high-temperature region of back-end ductwork are disposed with packet wall water-cooling wall.Furnace wall cooling is sequentially connected in series with packet wall water-cooling wall, and furnace wall cooling surface product is designed to boiler under 35% load condition, furnace water cooling wall outlet working medium mass dryness fraction >=85%.Alternatively, furnace wall cooling is in parallel with packet wall water-cooling wall, and furnace wall cooling surface product and packet wall water wall surface product are designed to boiler under 35% load condition, and the outlet working medium mass dryness fraction of furnace wall cooling and packet wall water-cooling wall reaches 100%.The invention further relates to a kind of back-end ductwork, the packet wall water-cooling wall of the high-temperature region including being arranged on back-end ductwork, the packet wall water-cooling wall is suitable for being connected on behind furnace wall cooling or suitable in parallel with furnace wall cooling.
Description
Technical field
The present invention relates to Sector of Cfb Boilers, particularly a kind of the overcritical of tail extended surface follows
Circulation fluidized bed boiler and a kind of back-end ductwork with extended surface.
Technical background
Enlargement and the inexorable trend that high parameter is Technology of Circulating Fluidized Bed Boiler development, with circulating fluidized bed boiler
The increase of capacity and the raising of steam parameter, the heat release volume of burner hearth increases faster compared with evaporation heating area in stove, heat release and
The unbalanced increase of heat absorption leads to the Layout Problem of heating surface.Especially for the circulating fluidized bed boiler of supercritical parameter, need
More heating surfaces are arranged in burner hearth to meet the heat absorption demand of working medium, but due to Boilers of Supercritical Parameters Hydrodynamic design
Complexity, difficult, the Normal practice that increases evaporating heating surface in stove by way of arranging conventional screen formula wall-cooling surface
It is to increase considerably furnace height, this manufacture cost for directly resulting in boiler is significantly increased.
In order to control furnace height, the Layout Problem of heating surface, existing during solution circulating fluidized bed boiler enlargement
Technology mainly increases burner hearth evaporating heating surface, control stove by increasing extension screen or change chamber structure shape in stove to reach
The purpose of thorax height：A kind of recirculating fluidized bed of the back-to-back water-cooling wall mid-board of band disclosed in Chinese patent 200620035303.8
Boiler furnace adds mid-board in burner hearth；A kind of recycle stream with water-cooled column disclosed in Chinese patent 200710151813.0
Fluidized bed boiler burner hearth, sets water-cooled column in burner hearth；A kind of supercritical steam cycle stream disclosed in Chinese patent 200710100248.5
Fluidized bed boiler furnace heating surface increases screen formula extended surface in burner hearth；One disclosed in Chinese patent 200910157103.8
The circulating fluidized bed boiler of cross heating screen structure of the kind with secondary air jet, sets cross heating screen in burner hearth；It is Chinese special
A kind of annular furnace circulating fluidized bed boiler disclosed in profit 201110031308.9, arrangement radiation is heated on burner hearth inner ring inner wall
Face；A kind of large circulating fluidized bed boiler disclosed in Chinese patent 201110140337.9, by regular polygon annular furnace
Shape disposed inboard heating surface, to increase burner hearth evaporation heating area.These modes make chamber structure become complicated, increase and set
Difficulty is counted, some also makes boiler operatiopn become complicated.
Invention content
The purpose of the present invention is overcoming prior art defect, a kind of supercritical steam cycle stream of tail extended surface is provided
Fluidized bed boiler does not change chamber structure, only by increasing extended surface in tail portion, is arranged to make up evaporating heating surface in burner hearth
Insufficient problem can effectively reduce furnace height, reduce boiler manufacture cost.
According to one aspect of the embodiment of the invention, propose a kind of supercritical steam cycle stream of tail extended surface
Fluidized bed boiler, including：Burner hearth is disposed with furnace wall cooling in burner hearth；Gas-solid separator；Material returning device；And back-end ductwork, wherein：
The high-temperature region of back-end ductwork is disposed with packet wall water-cooling wall, and the furnace wall cooling is sequentially connected in series with packet wall water-cooling wall, and burner hearth water
Cold wall heating surface area is designed to boiler under 35% load condition, mass dryness fraction >=85% of furnace water cooling wall outlet working medium.
A kind of other side according to an embodiment of the invention, it is proposed that supercritical steam cycle of tail extended surface
Fluidized-bed combustion boiler, including：Burner hearth is disposed with furnace wall cooling in burner hearth；Gas-solid separator；Material returning device；And back-end ductwork,
In：The high-temperature region of back-end ductwork is disposed with packet wall water-cooling wall, and the furnace wall cooling is in parallel with packet wall water-cooling wall, and furnace water cooling
Wall heating surface area and packet wall water wall surface product are designed to boiler under 35% load condition, furnace wall cooling and packet wall water cooling
The mass dryness fraction of the outlet working medium of wall reaches 100%.
Optionally, low temperature superheater is disposed in the inner space that the packet wall water-cooling wall limits in back-end ductwork.
Optionally, low-temperature reheater is disposed in the inner space that the packet wall water-cooling wall limits in back-end ductwork.
Optionally, high temperature superheater and/or high temperature reheater are disposed in the burner hearth.
Optionally, the supercritical circulating fluidized bed boiler further includes external heat exchanger, is arranged in the external heat exchanger
There are high temperature superheater and/or high temperature reheater.
Another further aspect according to an embodiment of the invention, it is proposed that a kind of back-end ductwork with extended surface, including：If
The packet wall water-cooling wall in the high-temperature region of back-end ductwork is put, the packet wall water-cooling wall is suitable for being connected on behind furnace wall cooling or fit
In in parallel with furnace wall cooling.Optionally, it is disposed in the inner space that the packet wall water-cooling wall limits in back-end ductwork low
Warm reheater and/or low temperature superheater.
The present invention reduces the steaming for needing to be arranged in burner hearth by shifting the evaporating heating surface in burner hearth to back-end ductwork
Send out heating surface so that furnace height can significantly reduce, and advantageously reduce boiler manufacture cost.
Description of the drawings
Fig. 1 is the schematic elevation view according to the supercritical circulating fluidized bed boiler of the embodiment of the present invention 1；
Fig. 2 is the schematic top plan view according to the supercritical circulating fluidized bed boiler of the embodiment of the present invention 1；
Fig. 3 is the schematic elevation view according to the supercritical circulating fluidized bed boiler of the embodiment of the present invention 2.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.Illustrating
In book, the same or similar drawing reference numeral indicates the same or similar bottom parts.Following reference attached drawings are to embodiment of the present invention
Explanation be intended to the present invention present general inventive concept explain, and be not construed as to the present invention a kind of limitation.
The present invention supercritical circulating fluidized bed boiler include sequentially connected burner hearth, gas-solid separator, material returning device and
The back-end ductwork being connected with gas-solid separator gas vent.After the flue gas that hearth combustion generates enters back-end ductwork, arrangement is flowed through
Each heating surface in back-end ductwork, temperature continuously decrease, and therefore, the upstream of back-end ductwork is high-temperature region, downstream is low-temperature space.
At present in conventional circulating fluidized bed boiler arrangement, back-end ductwork is vertical, and flue gas flows from above to below, then back-end ductwork top
It is low-temperature space for high-temperature region, lower part.
Packet wall water-cooling wall is arranged in the high-temperature region of back-end ductwork, with furnace wall cooling in parallel or series, is equivalent to one
The original burner hearth evaporating heating surface part in part is transferred to back-end ductwork, under the premise of the total evaporation heating area of boiler is constant,
Reduce the evaporating heating surface for needing to be arranged in burner hearth so that furnace height can reduce.
Working medium to ensure to draw from furnace wall cooling can uniformly enter packet wall water-cooling wall, the safety fortune for ensuring boiler
Row, must optimum option to the mass dryness fraction of furnace water cooling wall outlet working medium.Mass dryness fraction is excessively high, it is meant that furnace water cooling heating surface area is larger,
Furnace height reduction is limited, less economical；Mass dryness fraction is too low, and the flowing of steam water interface is easier to that deviation occurs, and causes packet wall water cooling
Wall localized heat transfer deteriorates.The present invention makes furnace water cooling wall outlet working medium by rationally designing the heating surface area of furnace wall cooling
Mass dryness fraction can also reach under 35% load condition of boiler 85% and more than, Wet Steam Flow Inside distributivity and dry saturated steam flowing at this time is special
Property is very close, can realize that working medium exports to evenly distributing for tail portion extended surface from water-cooling wall, it is ensured that even if low
Also has hydrodynamic force safety under load.
Back-end ductwork high-temperature region surrounding based on convection current heat transfer sets the relatively low packet wall water-cooling wall of Temperature of Working, in spoke
Penetrate in or beyond the stove based on heat transfer and put setting hyperthermia and superheating heating surface or reheating heating surface in heat exchanger, due to temperature in burner hearth and
Ash concentration is above back-end ductwork in external heat exchanger, therefore the high temperature superheater of the present invention and the arrangement of high temperature reheater carry
High heat transfer temperature and pressure or heat transfer coefficient, can reduce the heat exchange area of high temperature superheater or high temperature reheater, reduce high-grade metal
The consumption of material, further reduces boiler manufacture cost.
Embodiments of the present invention are illustrated below in conjunction with attached drawing.
Embodiment 1
Supercritical circulating fluidized bed boiler as shown in Figure 1 and Figure 2, including air compartment 1, burner hearth 2, cyclone separator 3, returning charge
Device 4, external heat exchanger 5, Cyclone outlet horizontal flue 6, packet wall water-cooling wall 7, low temperature superheater 8, low-temperature reheater 9,
Economizer 10, air preheater 11, steam-water separator 12.Three cyclone separators 3, three cyclonic separations are arranged after burner hearth outside wall
3 lower part of device is connected to three material returning devices 4 and three external heat exchangers 5 respectively.Medium temperature overheat is disposed in the external heat exchanger 5 in left side
Device 51 is disposed with high temperature superheater 52 in the external heat exchanger 5 at middle part, high temperature reheating is disposed in the external heat exchanger 5 on right side
Device 53.Back-end ductwork top surrounding is disposed with packet wall water-cooling wall 7, and low temperature superheater has been sequentially arranged from top to bottom in back-end ductwork
8th, low-temperature reheater 9, economizer 10, air preheater 11, wherein low temperature superheater 8 and low-temperature reheater 9 are arranged in Bao Qiangshui
7 inside of cold wall.
Boiler feedwater is followed by economizer 10, furnace wall cooling, packet wall water-cooling wall 7, steam-water separator 12, cryogenic overheating
Device 8, medium temperature overheater 51, high temperature superheater 52, the reheated steam drawn from steam turbine is followed by low-temperature reheater 9 and high temperature
Reheater 53.
Furnace wall cooling surface accumulates：It under 35% load condition of boiler, can reach the mass dryness fraction of furnace outlet working medium
Not less than 85%；7 heating surface area of packet wall water-cooling wall is：It, can be by the steaming from furnace wall cooling under 35% load condition of boiler
Vapour is heated to mass dryness fraction and reaches 100%.
Mass dryness fraction reaches 100% i.e. working medium and reaches saturation state or superheat state.
Therefore, the present invention proposes a kind of supercritical circulating fluidized bed boiler of tail extended surface, including：Stove
Thorax is disposed with furnace wall cooling in burner hearth；Gas-solid separator；Material returning device；And back-end ductwork, wherein：The high-temperature region of back-end ductwork
Packet wall water-cooling wall is disposed with, the furnace wall cooling is sequentially connected in series with packet wall water-cooling wall, and furnace wall cooling surface product design
Into boiler under 35% load condition, mass dryness fraction >=85% of furnace water cooling wall outlet working medium.
Embodiment 2
As shown in figure 3, supercritical circulating fluidized bed boiler is by air compartment 1, burner hearth 2, cyclone separator 3, material returning device 4, whirlwind
Separator outlet horizontal flue 6, packet wall water-cooling wall 7, low temperature superheater 8, low-temperature reheater 9, economizer 10, air preheater
11st, the compositions such as steam-water separator 12, burner hearth front wall collocation have high temperature pendant superheater 23 and high temperature screen formula reheater 24.After burner hearth
Three cyclone separators 3 are arranged outside wall, three 3 lower parts of cyclone separator are connected to three material returning devices 4 respectively.On back-end ductwork top
Surrounding is disposed with packet wall water-cooling wall 7, has been sequentially arranged low temperature superheater 8 in back-end ductwork from top to bottom, low-temperature reheater 9, has saved
Coal device 10, air preheater 11, wherein low temperature superheater 8 and low-temperature reheater 9 are arranged in 7 inside of packet wall water-cooling wall.
Boiler feedwater first flows through economizer 10, is further divided into two strands, flows separately through furnace wall cooling 26 and packet wall water-cooling wall
7, then converge, flow into steam-water separator 12, then flow successively through low temperature superheater 8, high temperature pendant superheater 23.Reheated steam according to
It is secondary to flow through low-temperature reheater 9 and high temperature screen formula reheater 24.
Furnace wall cooling surface is accumulated with 7 heating surface area of packet wall water-cooling wall：Under 35% load condition of boiler, the two is equal
Feedwater from economizer can be heated to mass dryness fraction and reach 100%.
Therefore, present invention also proposes a kind of supercritical circulating fluidized bed boiler of tail extended surface, including：Stove
Thorax is disposed with furnace wall cooling in burner hearth；Gas-solid separator；Material returning device；And back-end ductwork, wherein：The high-temperature region of back-end ductwork
Packet wall water-cooling wall is disposed with, the furnace wall cooling is in parallel with packet wall water-cooling wall, and furnace wall cooling surface product and packet wall water
Cold wall heating surface area is designed to boiler under 35% load condition, furnace wall cooling and the mass dryness fraction of the outlet working medium of packet wall water-cooling wall
Reach 100%.
Based on attached drawing 1,3, the invention also provides a kind of back-end ductwork with extended surface, including：It is arranged on tail portion
The packet wall water-cooling wall of the high-temperature region of flue, the packet wall water-cooling wall is suitable for being connected on behind furnace wall cooling or being suitable for and burner hearth
Water-cooling wall is in parallel.Optionally, low-temperature reheater is disposed in the inner space that the packet wall water-cooling wall limits in back-end ductwork
And/or low temperature superheater.
It should be noted that in embodiments of the present invention, packet wall water-cooling wall is arranged in the tail vertical well of back-end ductwork.
But packet wall water-cooling wall can also be arranged in the horizontal flue 6 of back-end ductwork.In other words, in the present invention, in back-end ductwork
High-temperature region in the packet wall water-cooling wall arranged be not limited to be arranged in tail vertical well, and packet wall water-cooling wall can also be divided into it is multiple
The subdivision of series connection.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding these embodiments can be changed without departing from the principles and spirit of the present invention, the scope of the present invention by
The following claims and their equivalents limit.
Claims (10)
1. a kind of supercritical circulating fluidized bed boiler of tail extended surface, including：
Burner hearth is disposed with furnace wall cooling in burner hearth；
Gas-solid separator；
Material returning device；With
Back-end ductwork,
Wherein：
The high-temperature region of back-end ductwork is disposed with the relatively low packet wall water-cooling wall of Temperature of Working, in the burner hearth water based on radiant heat transfer
Hyperthermia and superheating heating surface or reheating heating surface are set in cold wall so that temperature is higher than the temperature of back-end ductwork, the stove in burner hearth
Thorax water-cooling wall is sequentially connected in series with packet wall water-cooling wall, and furnace wall cooling surface product is designed to boiler under 35% load condition,
Mass dryness fraction >=85% of furnace water cooling wall outlet working medium.
2. supercritical circulating fluidized bed boiler according to claim 1, wherein：
The inner space that the packet wall water-cooling wall limits in back-end ductwork is disposed with low temperature superheater.
3. supercritical circulating fluidized bed boiler according to claim 1, wherein：
Low-temperature reheater is disposed in the inner space that the packet wall water-cooling wall limits in back-end ductwork.
4. supercritical circulating fluidized bed boiler according to claim 1, wherein：
High temperature superheater and/or high temperature reheater are disposed in the burner hearth.
5. supercritical circulating fluidized bed boiler according to claim 1, wherein：
The supercritical circulating fluidized bed boiler further includes external heat exchanger, and high temperature superheater is disposed in the external heat exchanger
And/or high temperature reheater.
6. a kind of supercritical circulating fluidized bed boiler of tail extended surface, including：
Burner hearth is disposed with furnace wall cooling in burner hearth；
Gas-solid separator；
Material returning device；With
Back-end ductwork,
Wherein：
The high-temperature region of back-end ductwork is disposed with the relatively low packet wall water-cooling wall of Temperature of Working, in the burner hearth water based on radiant heat transfer
Hyperthermia and superheating heating surface or reheating heating surface are set in cold wall so that temperature is higher than the temperature of back-end ductwork, the stove in burner hearth
Thorax water-cooling wall is in parallel with packet wall water-cooling wall, and furnace wall cooling surface product and packet wall water wall surface product are designed to that boiler exists
Under 35% load condition, furnace wall cooling and the mass dryness fraction of the outlet working medium of packet wall water-cooling wall reach 100%.
7. supercritical circulating fluidized bed boiler according to claim 6, wherein：
The inner space that the packet wall water-cooling wall limits in back-end ductwork is disposed with low temperature superheater.
8. supercritical circulating fluidized bed boiler according to claim 6, wherein：
Low-temperature reheater is disposed in the inner space that the packet wall water-cooling wall limits in back-end ductwork.
9. supercritical circulating fluidized bed boiler according to claim 6, wherein：
High temperature superheater and/or high temperature reheater are disposed in the burner hearth.
10. supercritical circulating fluidized bed boiler according to claim 6, wherein：
The supercritical circulating fluidized bed boiler further includes external heat exchanger, and high temperature superheater is disposed in the external heat exchanger
And/or high temperature reheater.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238073A (en) * | 2017-05-31 | 2017-10-10 | 安徽金鼎锅炉股份有限公司 | Biomass burning super-pressure resuperheat unit fluidized-bed combustion boiler |
| CN107101187B (en) * | 2017-06-26 | 2023-04-18 | 山东大学 | Heating system and heating method for supercritical carbon dioxide boiler |
| CN107120642B (en) * | 2017-06-27 | 2023-04-07 | 山东大学 | Heating system and heating method of supercritical carbon dioxide circulating fluidized bed boiler |
| CN110094723B (en) * | 2019-05-15 | 2024-09-20 | 东方电气集团东方锅炉股份有限公司 | Circulating fluidized bed thermodynamic system arrangement structure for combusting ultrahigh ash content fuel |
| CN111895436A (en) * | 2020-07-07 | 2020-11-06 | 哈尔滨哈锅锅炉工程技术有限公司 | Tail water-pocket wall flue device for circulating fluidized bed hot water boiler |
| CN114992627A (en) * | 2022-04-22 | 2022-09-02 | 东方电气集团东方锅炉股份有限公司 | Supercritical circulating fluidized bed boiler burning ultra-low heat value lignite |
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