CN208703896U - Ultra supercritical boiler hearth of circulating fluidized bed with suspension screen - Google Patents
Ultra supercritical boiler hearth of circulating fluidized bed with suspension screen Download PDFInfo
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- CN208703896U CN208703896U CN201821148504.8U CN201821148504U CN208703896U CN 208703896 U CN208703896 U CN 208703896U CN 201821148504 U CN201821148504 U CN 201821148504U CN 208703896 U CN208703896 U CN 208703896U
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- Prior art keywords
- pipe
- collecting chamber
- suspension screen
- lower header
- fluidized bed
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- 239000000725 suspension Substances 0.000 title claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 210000004262 dental pulp cavity Anatomy 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 7
- 239000003245 coal Substances 0.000 description 7
- 230000006872 improvement Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000013213 extrapolation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model discloses a kind of ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen, including upper collecting chamber, suspension screen, cyclone separator, lower header, furnace wall cooling, the first water supply distributive pipe, the second water supply distributive pipe, lower header outlet, burner hearths.Boiler feedwater is separately flowed into lower header by the first water supply distributive pipe and the second water supply distributive pipe and furnace wall cooling lower part, and the first water supply distributive pipe and the second water supply distributive pipe are the parallel flow relations of distribution；It is ramped up in pipe inflow upper collecting chamber into the water in lower header by hanging screen；Water into furnace wall cooling lower part flow up and absorb in burner hearth imported after heat upper collecting chamber with ramp up the water that pipe flows by hanging screen and mix.The utility model solves the problems such as CFB boiler existing heating surface difficult arrangement during enlargement, heating surface caloric receptivity is low, suitable for the CFB boiler of 660MW capacitance grade or more, is applied equally to 660MW capacitance grade and CFB boiler below.
Description
Technical field
The utility model relates to ultra supercritical circulating fluidized bed boiler fields, and in particular to a kind of super facing of band suspension screen
Boundary's boiler hearth of circulating fluidized bed.
Background technique
The coal resources very abundant in China, explored coal resources recoverable reserves account for about the world and have verified total amount
13%, cause coal not change within a very long time as the status of China main energy sources supplier by China's energy resource structure
Become.The coal burning mode in China mainly based on directly burning, discharges a large amount of pernicious gases and flue dust, dust particles in the process
Ecological environment is caused greatly to pollute, thus greatly develops efficient clean coal combustion technology and has been very urgent.It is ciculation fluidized
The one kind of bed (CFB) combustion technology as the clean combustion technique of coal, good, the high-efficient, pollutant emission with fuel tolerance
The features such as few, is used widely in station boiler.By the rapid development of recent decades science and technology, CFB boiler gradually to
Enlargement and the direction of high parameter develop, combustion technology is mature on the whole, and manufacture and operating cost are more cheap, and basic
It can satisfy environmental protection standard most stringent in the world, so that CFB boiler becomes China at this stage to most practicable
One of clean coal combustion means.
With the increase of CFB boiler capacity, burner hearth geometric dimension is also increased with it, and how to guarantee burner hearth flow field uniformity
And maintain reasonable bed temperature and flue gas temperature of hearth outlet as one of major issue in need of consideration in chamber design manufacture.
Blindly increasing burner hearth internal heating surface product, serious problems can be brought to boiler structure arrangement and manufacturing cost by increasing furnace height,
Therefore, carrying out scientific and reasonable arrangement to CFB boiler burner hearth internal heating surface is the major issue for needing to solve at present.
By retrieval, Chinese patent (CN200940824Y) discloses the recirculating fluidized bed with back-to-back water-cooling wall mid-board
Boiler furnace, in patent the split type chamber structure of utility model design include containing wearing layer, water-cooling wall, insulating layer burner hearth wall
Body and burner hearth top and its corresponding upper and lower header and forward and backward header, the slag-drip opening on forward and backward wall, feedback outlet, lime
Stone import, fuel and secondary air inlet, exhanst gas outlet, forward and backward siege and its air compartment, inverted " V " type siege dividing wall and be set to point
It is taken between partition wall and burner hearth top, the back-to-back water-cooling wall mid-board of the fence type of lower header.The patent improves to a certain extent
Burner hearth evaporation heating area, but this inverted " V " type chamber structure lower part is by the way of double air distribution plates, and middle and upper part conjunction
And at a whole burner hearth, this to be easy to appear two sides bed pressure fluctuation in operational process to which the danger such as tilting table occur.In addition,
Due to chamber structure complexity, manufacture and design, installation cost is higher；With the increase of boiler capacity, evaporation heating in required burner hearth
Face is difficult to realize corresponding proportion increase；And the problems such as very high, is required to the reliability and sensitivity of operation control system, so that
There is certain difficulty in practical engineering applications in it.
Utility model content
To overcome original technology insufficient, the utility model provides a kind of ultra supercritical circulating fluidized bed boiler of band suspension screen
Burner hearth.The chamber structure avoids improving using the method for dividing wall in furnace to reduce the requirement to operation control system
The flexibility and safety of operation；Meanwhile the quantity of suspension screen in parallel can change according to the change of boiler capacity, will not go out
Evaporating heating surface area and the unmatched problem of burner hearth capacity in existing actual furnace, and have structure simple, design is mounted to
This low advantage.
The utility model solves technical solution used by prior art problem:
With suspension screen ultra supercritical boiler hearth of circulating fluidized bed, including furnace wall cooling, upper collecting chamber, suspension screen and under
Header, the furnace water cooling pars intramuralis are burner hearth；The upper collecting chamber is arranged at the top of furnace wall cooling, and lower header setting exists
Outside furnace wall cooling, suspension screen is arranged in inside burner hearth, is provided on suspension screen and is ramped up pipe, ramps up pipe both ends point
It Lian Jie not the water inlet of upper collecting chamber and the water outlet of lower header；Boiler feedwater pipeline passes through the first water supply distributive pipe and second respectively
Water supply distributive pipe connects the water inlet of lower header and the water inlet of furnace wall cooling, and the water outlet and upper collecting chamber of furnace wall cooling connect
It connects.
Be arranged side by side on the suspension screen as a further improvement of the utility model, have it is multiple ramp up pipe, it is more
A ramp up after tube end intersects connect with upper collecting chamber, specific intersection construction are as follows: the end of outermost two root canals crosses
It is connected afterwards with the first water inlet of upper collecting chamber；The end of the root canal in secondary outside is connected after crossing with the second water inlet of upper collecting chamber
It connects；The end of N group pipe is connected after crossing with the N water inlet of upper collecting chamber, and multiple tube ends that ramp up sequentially form friendship
Pitch structure, N >=4.
Multiple lower headers are symmetricly set on furnace wall cooling two sides as a further improvement of the utility model, under each
Header and multi-panel suspension screen connection.
The multi-panel suspension screen of each lower header connection is arranged in parallel as a further improvement of the utility model,.
Pipe is ramped up for the extended surface tube of double-sided exposure, in inclination described in as a further improvement of the utility model,
Riser surface is coated with wear-resistant material.
Every face suspension screen width is no more than 3.5m as a further improvement of the utility model, and if opening on fin
Dry balance hole is used for the air pressure of equalizing suspension system screen two sides.
The tilt angle for ramping up pipe as a further improvement of the utility model,It is 105 °~110 °.
The pipe that ramps up uses riffled tube cast as a further improvement of the utility model,.
A kind of control method of the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen, comprising the following steps:
Boiler feedwater is separately flowed into lower header by the first water supply distributive pipe and the second water supply distributive pipe and furnace water cooling
Wall lower part；It is flowed into upper collecting chamber into the water in lower header by the pipe that ramps up on suspension screen；Into under furnace wall cooling
The water in portion is flowed up and is absorbed in burner hearth and imports in upper collecting chamber after heat, then mixed with the water by ramping up pipe inflow
It closes.
Preferably, the flow mean allocation of boiler feedwater pipeline is to the first water supply distributive pipe and the second water supply distributive pipe.
The utility model has the following beneficial effects:
By the way of suspension screen is arranged using inside in the chamber structure, pipe will be ramped up and be arranged on suspension screen, in inclination
Water and burner hearth in riser carry out heat exchange, and exchange efficiency is higher.The method using dividing wall in furnace is avoided, to reduce pair
The requirement of operation control system improves the flexibility and safety of operation；Meanwhile the quantity of suspension screen in parallel can be according to pot
The change of heat size and change, be not in evaporating heating surface area and the unmatched problem of burner hearth capacity in actual furnace.It is comprehensive
Upper described, the utility model solves CFB boiler existing heating surface difficult arrangement during enlargement, heating surface caloric receptivity
The problems such as low.And have structure simple, the design advantages such as installation cost is low, applicability is extensive, is not only suitable for 660MW capacity etc.
Grade or more CFB boiler, be also applied for 660MW capacitance grade and CFB boiler below.
In addition, being parallel-connection structure between suspension screen, compared to cascaded structure, upper lower header quantity is significantly reduced, and is reduced
Design installation cost and difficulty.
Meanwhile the utility model ramps up pipe to suspension screen and upper collecting chamber connection type uses " interior extrapolation method " to reduce collection
Box body thermal stress, it is ensured that safety in operation.
The control method of the utility model is collected in pipe inflow using the water in lower header by ramping up on suspension screen
In case；The water of furnace wall cooling lower part is flowed up and is absorbed in burner hearth and imports in upper collecting chamber after heat, then with pass through inclination
The water mixing that tedge flows into；Two path water is sufficiently swapped with heat in burner hearth, so that heating surface caloric receptivity is high, heat transmitting effect
Rate greatly improves.
Detailed description of the invention
Fig. 1 is the ultra supercritical boiler hearth of circulating fluidized bed front view with suspension screen；
Fig. 2 is the ultra supercritical boiler hearth of circulating fluidized bed top view with suspension screen；
Fig. 3 is schematic enlarged-scale view at A；
Fig. 4 is schematic enlarged-scale view at B.
In figure, 1- upper collecting chamber；2- suspension screen；3- cyclone separator；4- lower header；5- furnace wall cooling；The first water supply of 6-
Distributive pipe；7- the second water supply distributive pipe；8- burner hearth；9- ramps up pipe；Each arrow is the flow direction of water in figure.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing and by specific embodiment, and following embodiment is only retouched
The property stated, it is not restrictive, protection scope of this utility model cannot be limited by this.
As depicted in figs. 1 and 2, the ultra supercritical boiler hearth of circulating fluidized bed of the utility model band suspension screen, including it is upper
Header 1, suspension screen 2, cyclone separator 3, lower header 4, furnace wall cooling 5, the first water supply distributive pipe 6, the second water supply distributive pipe 7
And burner hearth 8.The setting of upper collecting chamber 1 is at 5 top of furnace wall cooling, and the setting of lower header 4 is in 5 two sides of furnace wall cooling, 2 arrangement of suspension screen
Inside burner hearth 8, it is provided on suspension screen 2 and ramps up pipe 9, ramp up the water inlet that 9 both ends of pipe are separately connected upper collecting chamber 1
With the water outlet of lower header 4；Boiler feedwater pipeline passes through respectively under the first water supply distributive pipe 6 and the connection of the second water supply distributive pipe 7
The water inlet of header 4 and the water inlet of furnace wall cooling 5, the water outlet of furnace wall cooling 5 are connect with upper collecting chamber 1.Cyclonic separation
Device 3 is arranged in the two sides of furnace wall cooling 5.
Its working principle and control method are as follows: boiler feedwater is divided by the first water supply distributive pipe 6 and the second water supply distributive pipe 7
It Liu Ru not be in lower header 4 and 5 lower part of furnace wall cooling, the first water supply distributive pipe 6 and the second water supply distributive pipe 7 are parallel flow point
With relationship；Pipe 9 is ramped up by suspension screen 2 into the water in lower header 4 to flow into upper collecting chamber 1；Into under furnace wall cooling 5
The water in portion flows up and absorbs the water for importing upper collecting chamber 1 in burner hearth 8 after heat and ramping up the inflow of pipe 9 by suspension screen 2
Mixing.
Wherein, as shown in Figure 1, the assignment of traffic between the lower header 4 and furnace wall cooling 5 is parallel relationship, i.e.,
Water supply passes through the first water supply distributive pipe 6 respectively and the second water supply distributive pipe 7 flows into lower header 4 and furnace wall cooling 5.
As shown in Figure 3 and Figure 4, the suspension screen 2 ramps up the tilt angle (angle with horizontal plane) of pipe 9For
105°—110°；Facilitate water to ramp up in the inflow upper collecting chamber 1 of pipe 9 by suspension screen 2.The suspension screen 2 is arranged in furnace
It is interior, the extended surface tube that pipe 9 is double-sided exposure is ramped up, surface is coated with wear-resistant material.
Assignment of traffic between every 1 face suspension screen 2 is the relations of distribution in parallel, i.e., equal water supply is evenly distributed via lower header 4
To each suspension screen 2；Every 1 face suspension 2 width of screen are no more than 3.5m, and opening several diameters on fin is 30mm's
Balance hole is with the air pressure of 2 two sides of equalizing suspension system screen.
The suspension screen 2 ramps up pipe 9 and uses riffled tube cast.
As shown in figure 3, the suspension screen 2 ramps up pipe 9 and 1 connection type of upper collecting chamber is " interior extrapolation method ", i.e., it is outermost
2 root canals (pipe that the number in Fig. 3 is a, d) of side are connected in same position with upper collecting chamber 1；2 root canals in secondary outside are (in Fig. 3
Number be b, c pipe) be connected in same position with upper collecting chamber 1；It is greater than 4 when ramping up 9 quantity of pipe in suspension screen 2
When, the rest may be inferred with the connection type of upper collecting chamber 1.
It should be noted that above-described embodiment is only the preferable embodiment of the utility model, but the utility model not by
Above-described embodiment limitation, it is all to the above embodiments under the principles of the present invention and Spirit Essence any simply to repair
Change, combine, equivalence replacement, change, simplification, should be included in the protection scope of the utility model.
Claims (8)
1. the ultra supercritical boiler hearth of circulating fluidized bed with suspension screen, which is characterized in that including furnace wall cooling (5), upper collection
Case (1), suspension screen (2) and lower header (4), the internal furnace wall cooling (5) is burner hearth (8)；The upper collecting chamber (1) is set
It sets at the top of furnace wall cooling (5), lower header (4) setting is external in furnace wall cooling (5), and suspension screen (2) is arranged in burner hearth (8)
Inside, suspension, which shields to be provided on (2), ramps up pipe (9), ramps up the water inlet that pipe (9) both ends are separately connected upper collecting chamber (1)
The water outlet of mouth and lower header (4)；Boiler feedwater pipeline passes through the first water supply distributive pipe (6) and the second water supply distributive pipe respectively
(7) water inlet of lower header (4) and the water inlet of furnace wall cooling (5), the water outlet and upper collecting chamber of furnace wall cooling (5) are connected
(1) it connects.
2. the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen according to claim 1, which is characterized in that described
Suspension screen (2) on be arranged side by side have it is multiple ramp up pipe (9), it is multiple ramp up after pipe (9) end portions cross with upper collecting chamber
(1) it connects, specific intersection construction are as follows: the first water inlet phase with upper collecting chamber (1) after the end of outermost two root canals crosses
Connection；The end of two root canals in secondary outside is connected after crossing with the second water inlet of upper collecting chamber (1)；It hands over the end of N group pipe
It is connected after remittance with the N water inlet of upper collecting chamber (1), multiple pipe (9) ends that ramp up sequentially form intersection construction, N >=4.
3. the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen according to claim 1, which is characterized in that multiple
Lower header (4) is symmetricly set on furnace wall cooling (5) two sides, and each lower header (4) is hung screen (2) with multi-panel and connect.
4. the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen according to claim 3, which is characterized in that each
The multi-panel suspension screen (2) of lower header (4) connection is arranged in parallel.
5. the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen according to claim 4, which is characterized in that described
Ramp up pipe (9) be double-sided exposure extended surface tube, ramp up pipe (9) surface and be coated with wear-resistant material.
6. the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen according to claim 5, which is characterized in that every face
Suspension screen width is no more than 3.5m, and air pressure of several balance holes for equalizing suspension system screen two sides is opened on fin.
7. the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen according to claim 1, which is characterized in that described
The tilt angle for ramping up pipe (9)It is 105 °~110 °.
8. the ultra supercritical boiler hearth of circulating fluidized bed of band suspension screen according to claim 1, which is characterized in that described
Ramp up pipe (9) using riffled tube cast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821148504.8U CN208703896U (en) | 2018-07-19 | 2018-07-19 | Ultra supercritical boiler hearth of circulating fluidized bed with suspension screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821148504.8U CN208703896U (en) | 2018-07-19 | 2018-07-19 | Ultra supercritical boiler hearth of circulating fluidized bed with suspension screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208703896U true CN208703896U (en) | 2019-04-05 |
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ID=65938811
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821148504.8U Expired - Fee Related CN208703896U (en) | 2018-07-19 | 2018-07-19 | Ultra supercritical boiler hearth of circulating fluidized bed with suspension screen |
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| CN (1) | CN208703896U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109140411A (en) * | 2018-07-19 | 2019-01-04 | 西安交通大学 | Ultra supercritical boiler hearth of circulating fluidized bed and its control method with suspension screen |
-
2018
- 2018-07-19 CN CN201821148504.8U patent/CN208703896U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109140411A (en) * | 2018-07-19 | 2019-01-04 | 西安交通大学 | Ultra supercritical boiler hearth of circulating fluidized bed and its control method with suspension screen |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190405 |