CN110260300A - Increase the boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance outside interior augmentation of heat transfer - Google Patents
Increase the boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance outside interior augmentation of heat transfer Download PDFInfo
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- CN110260300A CN110260300A CN201910457564.0A CN201910457564A CN110260300A CN 110260300 A CN110260300 A CN 110260300A CN 201910457564 A CN201910457564 A CN 201910457564A CN 110260300 A CN110260300 A CN 110260300A
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- heat transfer
- burner hearth
- augmentation
- boiler
- wall
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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
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
- F23C3/006—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion
- F23C3/008—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion for pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses the boiler furnace structure for increasing thermal resistance outside a kind of interior augmentation of heat transfer, including burner hearth, the burner hearth includes the outer heat insulation layer that cooling wall, covering are arranged on the outside of cooling wall and the inner insulating layer on the inside of cooling wall is arranged in covering；The cooling wall includes cooling tube and cooling tube is linked to be to whole connecting plate, and interior augmentation of heat transfer structure is provided on the inner wall of the every cooling tube；The inner insulating layer includes a plurality of heat insulating belt of lateral circular burner hearth setting, and a plurality of heat insulating belt is arranged along wall surface longitudinal gap.The invention also discloses the supercritical carbon dioxide coal-burning boilers using aforementioned structure.The present invention can prevent burner hearth cooling wall overtemperature using the design for increasing thermal resistance outside interior augmentation of heat transfer, guarantee the safety and stability economical operation of supercritical carbon dioxide coal-burning boiler.
Description
Technical field
The present invention relates to a kind of supercritical carbon dioxide coal-burning boiler, particularly relate to increase thermal resistance outside a kind of interior augmentation of heat transfer
Boiler furnace structure and supercritical carbon dioxide coal-burning boiler.
Background technique
In recent years, supercritical carbon dioxide power cycle (sCO2Circulation) become research hotspot, due to supercritical CO2Have
The advantages that chemical property is stable, the high and low cost of density, high temperature oxidation stability is weak, the circulatory system is simple, compact-sized, high-efficient,
sCO2Circulation is expected to break through the bottleneck of existing power cycle technology development, has a good application prospect in field of thermal power.
sCO2The mode of similar steam turbine power generation can be used in circulation, obtains thermal energy by coal-burning boiler indirect heating and carries out
Power generation.There is document to point out, when turbine inlet temperature is higher than 550 DEG C, sCO2Cycle efficieny will be above steam Rankine cycle, and temperature
It spends higher advantage to be more obvious, therefore supercritical carbon dioxide coal-burning boiler generally selects higher Temperature of Working.In addition overcritical
CO2Brayton cycle characteristic, into supercritical carbon dioxide coal-burning boiler in Temperature of Working it is high compared with conventional boiler by 100~200
℃。
Higher Temperature of Working proposes challenge to the heat-resisting ability of supercritical carbon dioxide coal-burning boiler burner hearth.Due to
Refrigerant heat transfer performance is low compared with conventional steam boiler in supercritical carbon dioxide coal-burning boiler, and current material is difficult to arrange overcritical
CO2Heating surface.Chinese invention patent 201510813308.2 discloses a kind of resistance to heat seal of 700 DEG C of ultra-supercritical boiler water-cooling walls
Gold and tubing manufacturing method, can improve supercritical carbon dioxide heating surface of coal-fired boiler temperature resistant capability, to guarantee boiler safety
Property.However, supercritical carbon dioxide coal-burning boiler cost can be greatly improved using this water-cooling wall heat-resisting alloy, it is unfavorable for pushing away
Wide application.
Summary of the invention
The purpose of the present invention is to provide increase outside a kind of interior augmentation of heat transfer that can be improved boiler furnace heat-resisting ability
The boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance.
To achieve the above object, increase the boiler furnace structure of thermal resistance outside the interior augmentation of heat transfer designed by the present invention, including
Burner hearth, the burner hearth include cooling wall, cover the outer heat insulation layer being arranged on the outside of cooling wall and covering setting on the inside of cooling wall
Inner insulating layer；The cooling wall includes more cooling tubes and more cooling tubes is linked to be whole connecting plate, and every described cold
But it is provided with interior augmentation of heat transfer structure on the inner wall of pipe, the common augmentation of heat transfer knot such as internal screw thread, inner fin, groove can be used
Structure；The inner insulating layer includes a plurality of heat insulating belt of lateral circular burner hearth setting respectively, and a plurality of heat insulating belt is along burner hearth longitudinal direction
Arranged for interval.
Preferably, outer augmentation of heat transfer knot is provided on the side of the inward-facing thermal insulation layer of the outer wall of the every cooling tube
The common augmentation of heat transfer structure such as external screw thread, outer fin, groove can be used in structure.
Preferably, the outer augmentation of heat transfer structure uses the multiple outer wings longitudinally disposed and vertical with tube wall along cooling tube
Piece.
Preferably, the width W of each outer fin is positively correlated with its root to inner insulating layer inner wall distance D, i.e., D is smaller
When W it is smaller, W is larger when D is larger.The structure can be reduced cooling wall and inner insulating layer and cause heat transfer uneven due in uneven thickness
It is even, the problem of making inner layer heat-insulation layer to fiery side non-uniform temperature, and then lead to easy coking slag inclusion.
Preferably, the outer heat insulation layer uses 800 DEG C of heatproof of heat preservation brick masonry, and the inner insulating layer uses heatproof 1200
DEG C refractory coating.
Invention also provides a kind of supercritical carbon dioxide coal-burning boilers, including the boiler body with burner hearth, institute
Burner hearth is stated using aforementioned boiler furnace structure.
Preferably, the whole region of burner hearth is arranged in the outer heat insulation layer and cooling wall, and the inner insulating layer is arranged in furnace
The high-temperature area of thorax --- the lower part of whole and after-flame region and primary combustion zone including primary combustion zone.
Preferably, the after-flame region of the burner hearth is up big and down small infundibulate, and it is heated that this shape can increase burner hearth
Area reduces thermic load.This " up big and down small infundibulate " structure, on the one hand due to using interior augmentation of heat transfer (cooling tube) outside
The design for increasing thermal resistance (outer heat insulation layer and inner insulating layer) causes boiler heat load to reduce, and heat is difficult to pass to working medium side, because
This needs to increase furnace heating surface；On the other hand, since the expansion in boiler primary zone space certainly will will affect burner hearth ignitability, it is
Boiler primary zone fire root is kept, therefore uses aforementioned " up big and down small infundibulate " boiler furnace structure.
Preferably, the after-flame region upper port diameter of the burner hearth expands as 1~2 times of lower part bore.
Compared with prior art, the beneficial effects of the present invention are:
1) design for increasing thermal resistance (outer heat insulation layer and inner insulating layer) outside using interior augmentation of heat transfer (cooling tube), is conducive to drop
Low primary combustion zone burner hearth heat flow density reduces furnace load；Interior augmentation of heat transfer can be reduced intraductal heat transfer thermal resistance, to reduce
Cooling intraductal working medium reduces the promotion of cooling wall material rate to prevent burner hearth cooling wall overtemperature with cooling tube wall temperature difference
Bring increased costs guarantee the safety and stability economical operation of supercritical carbon dioxide coal-burning boiler.
2) inner insulating layer uses spaced apart heat insulating belt, and on the one hand contact surface breaks the whole up into parts, obtains coking and slagging
Dispersion, prevents bulk coking and slagging；On the other hand, the temperature gradient very little of every heat insulating belt in the vertical direction, heat insulating belt is not
It is easy to generate cracking because of thermal stress, improves the service life of inner insulating layer.
Detailed description of the invention
Fig. 1 is the section structure signal for the boiler furnace structure for increasing thermal resistance outside interior augmentation of heat transfer designed by the present invention
Figure.
Fig. 2 is the enlarged drawing in Fig. 1 at A.
Fig. 3 is the expanded schematic diagram (seeing from inside to outside) of boiler furnace structure in Fig. 1.
Fig. 4 is the partial structural diagram (corresponding in Fig. 1 at A) of another burner hearth.
Fig. 5 is the decomposition diagram of burner hearth part in Fig. 4.
Fig. 6 is the enlarged drawing in Fig. 4 at B.
Fig. 7 is the structural schematic diagram of supercritical carbon dioxide coal-burning boiler designed by the present invention.
Wherein: outer heat insulation layer 100, cooling wall 200, connecting plate 210, cooling tube 220, interior augmentation of heat transfer structure 221, outer strong
Change heat transfer structure 222, outer fin 223, inner insulating layer 300, heat insulating belt 310, ash bucket 400, primary combustion zone 500, after-flame region
600, burner hearth 700
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in Figures 1 to 3, increase the boiler furnace structure of thermal resistance outside the interior augmentation of heat transfer designed by the present invention, including cold
But wall 200, covering the outer heat insulation layer 100 in the outside of cooling wall 200 is set and covering be arranged in it is heat-insulated in 200 inside of cooling wall
Layer 300, in which:
Cooling wall 200 is membrane type cooling wall, is linked to be whole company including more cooling tubes 220 and by more cooling tubes 220
Fishplate bar 210 is provided with interior augmentation of heat transfer structure 221 on the inner wall of cooling tube 220, in embodiments in augmentation of heat transfer structure
221 are all made of internal thread structure.
Inner insulating layer 300 includes a plurality of heat insulating belt 310 that lateral circular burner hearth 700 is arranged, and a plurality of heat insulating belt 310 is vertical
It is equidistantly spaced from direction.
Outer heat insulation layer 100 uses 800 DEG C of heatproof of heat preservation brick masonry, and inner insulating layer 300 uses 1200 DEG C of heatproof of fire resisting
Material coating.
It as shown in figures 4-6, can also be further in the inward-facing thermal insulation layer of outer wall in cooling tube 220 for interior augmentation of heat transfer
Outer augmentation of heat transfer structure 222 is set on 300 side.Outer augmentation of heat transfer structure 222 using it is longitudinally disposed along cooling tube 220 and with
The vertical outer fin 223 of tube wall.The width W of outer fin 223 is positively correlated with its root to 300 inner wall distance D of inner insulating layer,
W is smaller when i.e. D is smaller, and W is larger when D is larger.
As shown in fig. 7, invention also provides the supercritical carbon dioxide fire coal pots using aforementioned boiler furnace structure
Furnace, including burner hearth 700, burner hearth 700 are successively ash bucket 400, primary combustion zone 500 and after-flame region 600 from the bottom up.
The whole region of burner hearth 700 is arranged in outer heat insulation layer 100 and cooling wall 200, and inner insulating layer 300 is provided only on burner hearth
700 high-temperature area, each embodiment high temperature region include the whole and after-flame region 600 and main burning of primary combustion zone 500
The part that region 500 connects.
After-flame region 600 is designed as up big and down small infundibulate, and upper part bore expands as 1~2 times of lower part bore.
The height of inner insulating layer 300 is L, and the height of primary combustion zone 500 is S, primary combustion zone 500+ after-flame region 600
The sum of height be H, wherein S < L < H.
The above unaccounted boiler structure, such as air and flue system, are designed using disclosed in the prior art.
Invention also provides a comparative examples and multiple embodiments to verify to technical effect.
Comparative example 1
The supercritical carbon dioxide coal-burning boiler type of furnace that this comparative example uses is in for 1000MW type twin furnace Π type furnace
BMCR operating condition, the wide deep standard size of primary combustion zone 500 is 34.22 × 15.67m, and after-flame region 600 expands without size of burner hearth,
It is 10.23m, the bottom to after-flame region of primary combustion zone 500 having a size of 34.22 × 15.67m, 500 height S of primary combustion zone
The height H at 600 top is 30.24m, is not provided with inner insulating layer 300, the cooling tube 220 that cooling wall 200 is selected be φ 28.6 ×
5.2mm light pipe.
Embodiment 1
The supercritical carbon dioxide coal-burning boiler type of furnace that the present embodiment uses is 700 Π type furnace of 1000MW type twin furnace, place
In BMCR operating condition, the wide deep standard size of primary combustion zone 500 is 34.22 × 15.67m, and the big size of burner hearth in after-flame region 600 is
41.06 × 18.80m, 500 height S of primary combustion zone are 10.23m, the top of the bottom of primary combustion zone 500 to after-flame region 600
The height H in portion is 30.24m, and the height L of inner insulating layer 300 is 10.23m, and heat insulating belt integrally covers, and cooling wall 200 is selected cold
But pipe 220 is 28.6 × 5.2mm of φ riffled tube, outside not augmentation of heat transfer.
Embodiment 2
The supercritical carbon dioxide coal-burning boiler type of furnace that the present embodiment uses is 700 Π type furnace of 1000MW type twin furnace, place
In BMCR operating condition, the wide deep standard size of primary combustion zone 500 is 34.22 × 15.67m, and the big size of burner hearth in after-flame region 600 is
41.06 × 18.80m, 500 height S of primary combustion zone are 10.23m, the top of the bottom of primary combustion zone 500 to after-flame region 600
The height H in portion is 30.24m, and the height L of inner insulating layer 300 is 15m, and heat insulating belt 310 selects the mode of interval covering, heat insulating belt
310 width are 2m, between two heat insulating belts 310 between be divided into 3m, the cooling tube 220 that cooling wall 200 is selected is 28.6 × 5.2mm of φ
Riffled tube, outside not augmentation of heat transfer.
Embodiment 3
The supercritical carbon dioxide coal-burning boiler type of furnace that the present embodiment uses is 700 Π type furnace of 1000MW type twin furnace, place
In BMCR operating condition, the wide deep standard size of primary combustion zone 500 is 34.22 × 15.67m, and the big size of burner hearth in after-flame region 600 is
51.33 × 23.51m, 500 height S of primary combustion zone are 10.23m, the top of the bottom of primary combustion zone 500 to after-flame region 600
The height H in portion is 30.24m, and the height L of inner insulating layer 300 is 15m, and heat insulating belt 310 selects the mode of interval covering, heat insulating belt
310 width are 2m, between two heat insulating belts 310 between be divided into 3m, the cooling tube 220 that cooling wall 200 is selected is 28.6 × 5.2mm of φ
Riffled tube is provided with outer augmentation of heat transfer structure to fiery side on the outside of screwed pipe, which uses longitudinally disposed simultaneously along cooling tube
The outer fin vertical with tube wall, the width W=D/2 of outer fin.
ANSYS FLUENT analog study is carried out to the boiler operation situation of above-mentioned comparative example and each embodiment, most to metal
High wall temperature is calculated to be calculated using MATLAB, and result of study is as follows:
1 comparative example of table and each embodiment analog result
Based on this analog result, embodiment 1,2 and 3 is guaranteed using up big and down small chamber structure combustibility, together
Boiler heat load is effectively reduced in the chamber structure for increasing thermal resistance in Shi Caiyong outside augmentation of heat transfer；Using the heat insulating belt cloth of interval covering
The embodiment 2 and 3 for setting mode can reduce coking and slagging, prevent knot bulk coke from smashing ash bucket；Embodiment 3 is further using export-oriented fire
The structure of side uniformly transfer heat, further uniform thermic load, reduces metal highest wall temperature, guarantees burner hearth safe operation.
Claims (10)
1. increasing the boiler furnace structure of thermal resistance, including burner hearth (700) outside a kind of interior augmentation of heat transfer, it is characterised in that: the furnace
Thorax (700) includes that the outer heat insulation layer (100) and covering of cooling wall (200), covering setting on the outside of cooling wall (200) are arranged cold
But the inner insulating layer (300) on the inside of wall (200)；The cooling wall (200) includes more cooling tubes (220) and by more cooling tubes
(220) it is linked to be whole connecting plate (210), is provided with interior augmentation of heat transfer structure on the inner wall of the every cooling tube (220)
(221)；The inner insulating layer (300) includes a plurality of heat insulating belt (310) of lateral circular burner hearth (700) setting respectively, a plurality of institute
Heat insulating belt (310) is stated to arrange along burner hearth (700) longitudinal gap.
2. increasing the boiler furnace structure of thermal resistance outside interior augmentation of heat transfer according to claim 1, it is characterised in that: every institute
It states and is provided with outer augmentation of heat transfer structure (222) on the side of the inward-facing thermal insulation layer of outer wall (300) of cooling tube (220).
3. increasing the boiler furnace structure of thermal resistance outside interior augmentation of heat transfer according to claim 2, it is characterised in that: described outer
Augmentation of heat transfer structure (222) uses the multiple outer fins (223) longitudinally disposed and vertical with tube wall along cooling tube (220).
4. increasing the boiler furnace structure of thermal resistance outside interior augmentation of heat transfer according to claim 3, it is characterised in that: each described
The width W and its root to inner insulating layer (300) inner wall distance D of outer fin (223) are positively correlated, i.e., W is smaller when D is smaller, D compared with
W is larger when big.
5. increasing the boiler furnace structure of thermal resistance, feature outside interior augmentation of heat transfer according to any one of claims 1 to 4
Be: the interior augmentation of heat transfer structure (221) is internal screw thread.
6. increasing the boiler furnace structure of thermal resistance, feature outside interior augmentation of heat transfer according to any one of claims 1 to 4
Be: the outer heat insulation layer (100) uses 800 DEG C of heatproof of heat preservation brick masonry, and the inner insulating layer (300) uses heatproof 1200
DEG C refractory coating.
7. a kind of supercritical carbon dioxide coal-burning boiler, including the boiler body with burner hearth (700), it is characterised in that: described
Burner hearth (700) is using such as boiler furnace structure according to any one of claims 1 to 6.
8. supercritical carbon dioxide coal-burning boiler according to claim 7, it is characterised in that: the outer heat insulation layer (100)
Whole region with cooling wall (200) setting in burner hearth (700), high temperature of inner insulating layer (300) setting in burner hearth (700)
Region；The high-temperature area includes whole and after-flame region (600) and primary combustion zone (500) of primary combustion zone (500)
Lower part.
9. supercritical carbon dioxide coal-burning boiler according to claim 8, it is characterised in that: the combustion of the burner hearth (700)
Region (600) are up big and down small infundibulate to the greatest extent.
10. supercritical carbon dioxide coal-burning boiler according to claim 9, it is characterised in that: the combustion of the burner hearth (700)
Region (600) top bore expands as 1~2 times of lower part bore to the greatest extent.
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| CN201910457564.0A CN110260300A (en) | 2019-05-29 | 2019-05-29 | Increase the boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance outside interior augmentation of heat transfer |
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| CN201910457564.0A CN110260300A (en) | 2019-05-29 | 2019-05-29 | Increase the boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance outside interior augmentation of heat transfer |
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| CN201819241U (en) * | 2010-09-26 | 2011-05-04 | 广西西江锅炉制造有限公司 | Boiler wall sealing device |
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| CN104075339A (en) * | 2014-07-10 | 2014-10-01 | 国家电网公司 | Power station pulverized coal boiler heat insulation band and method for determining area and laying position of heat insulation band |
| CN207486843U (en) * | 2017-08-23 | 2018-06-12 | 华能国际电力股份有限公司 | Supercritical CO2 boiler furnace combustion-protection belt structure |
| CN108413385A (en) * | 2018-03-06 | 2018-08-17 | 浙江哲丰能源发展有限公司 | A kind of low nitrogen burning method of circulating fluidized bed boiler |
| CN208042108U (en) * | 2018-02-02 | 2018-11-02 | 南通港华锅炉有限公司 | A kind of boiler dividing waterwall |
-
2019
- 2019-05-29 CN CN201910457564.0A patent/CN110260300A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163370A (en) * | 1997-04-15 | 1997-10-29 | 首钢总公司 | High temperature high pressure electric power station boiler fully burning blast-furnace gas |
| CN201599814U (en) * | 2010-01-18 | 2010-10-06 | 中国电力工程顾问集团东北电力设计院 | Large-aperture film type internal cooling pipeline for thermal power plant |
| CN201819241U (en) * | 2010-09-26 | 2011-05-04 | 广西西江锅炉制造有限公司 | Boiler wall sealing device |
| CN102997276A (en) * | 2012-12-26 | 2013-03-27 | 北京国电蓝天节能科技开发有限公司 | Radiation enhanced combustion boiler cavity |
| CN104075339A (en) * | 2014-07-10 | 2014-10-01 | 国家电网公司 | Power station pulverized coal boiler heat insulation band and method for determining area and laying position of heat insulation band |
| CN207486843U (en) * | 2017-08-23 | 2018-06-12 | 华能国际电力股份有限公司 | Supercritical CO2 boiler furnace combustion-protection belt structure |
| CN208042108U (en) * | 2018-02-02 | 2018-11-02 | 南通港华锅炉有限公司 | A kind of boiler dividing waterwall |
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Application publication date: 20190920 |