CN1948831B - Arranging method of layered fluidization air distribution plate of fluidized bed boiler - Google Patents
Arranging method of layered fluidization air distribution plate of fluidized bed boiler Download PDFInfo
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- CN1948831B CN1948831B CN200610118146A CN200610118146A CN1948831B CN 1948831 B CN1948831 B CN 1948831B CN 200610118146 A CN200610118146 A CN 200610118146A CN 200610118146 A CN200610118146 A CN 200610118146A CN 1948831 B CN1948831 B CN 1948831B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005243 fluidization Methods 0.000 title claims description 14
- 239000000446 fuel Substances 0.000 claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 8
- 230000008676 import Effects 0.000 claims description 8
- 239000010884 boiler slag Substances 0.000 claims description 4
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 230000003134 recirculating effect Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 239000008187 granular material Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention adopts a multi-layer arrangement method of a fluidized-bed boiler bottom air-feeding plates and the integral hearth bottom consists of three independent air-feeding plates. One air-feeding plate is disposed in the lowerest part of the hearth and on the above air-feeding plate are overlaid the other air-feeding plates, so as to realize the step charging, the step air-supply and the fractional combustion of the recirculating fluidized-bed boiler. By regulating the blast volume and the fuel flow of each air-feeding plate, the uniform combustion and air-supply of the boiler can be realizer.
Description
Technical field
The present invention relates to a kind of method for arranging of layered fluidization air distribution plate of fluidized bed boiler, be used for recirculating fluidized bed layering cloth wind, layered fluidized and stratified combustion, belong to CFBB fluidization technique field.
Background technology
Along with CFBB constantly to maximization, the high parameter direction develops, the sectional area of burner hearth is increasing, because furnace depth is subjected to the restriction of secondary wind penetration capacity and can not increases in proportion, simultaneously because the increase of boiler capacity and the raising of parameter, the area of burner hearth bottom air distribution plate increases, the inhomogeneity difficulty of cloth wind improves, in order to solve the difficult problem that the CFBB capacity amplifies, well-known in the world boiler developer ALSTOM company has adopted " pants " double-furnace structure as shown in Figure 1, burner hearth 1 bottom air distribution plate 12 is separated into the pants form, boiler secondary air is sent into along outside differing heights in the pants, because the penetration capacity of secondary wind is limited, the purpose of this layout makes the even air distribution of secondary wind.
The structure of this but " pants " twin furnace, furnace wall cooling manufactures and designs complexity, simultaneously because burner hearth is divided into two controls separately, boiler is in startup and running, both sides burner hearth bed flattens weighing apparatus and is difficult to control, cause the bed material to scurry the phenomenon of a tilting table sometimes, have a strong impact on the safe operation of boiler.
Summary of the invention
The purpose of this invention is to provide that a kind of boiler capacity is amplified and the method for arranging of the fluidized-bed combustion boiler furnace bottom air distribution plate of safe operation.
For realizing above purpose, technical scheme of the present invention provides a kind of method for arranging of layered fluidization air distribution plate of fluidized bed boiler, it is characterized in that, adopts layered arrangement, realizes CFBB classification refuelling, air stage feeding and fractional combustion, and its method is:
Step 1. is put first air distribution plate, second air distribution plate and the 3rd air distribution plate at the burner hearth base fabric of boiler furnace, first air distribution plate is arranged in the foot of boiler furnace, be following air distribution plate layer, arrange second air distribution plate and the 3rd air distribution plate in the top of first air distribution plate bilateral symmetry, communicate with the first air distribution plate both sides, form the upper wind plate layer, be respectively equipped with a weir between second air distribution plate, the 3rd air distribution plate bottom and first air distribution plate;
Step 3. is arranged second fuel inlet at second air distribution plate and the 3rd air distribution plate outer lower portion, arranges second fuel inlet and tertiary air import in outer upper.
Described upper wind plate layer is for trapezoidal, and following air distribution plate layer is for falling trapezoidal or rectangle.
The method that the present invention adopts fluidized-bed combustion boiler furnace bottom air distribution plate branch multilayer to arrange, form by three relatively independent air distribution plates at the bottom of the whole burner hearth, air distribution plate 1 is arranged in the burner hearth foot, top superpose again air distribution plate 2 and 3, realize CFBB classification refuelling, air stage feeding and fractional combustion, by air quantity and the fuel quantity of adjusting each air distribution plate, can realize that boiler evenly burns, even distributing wind, ciculation fluidized boiler provides new method for designing in order to maximize.
Advantage of the present invention is:
1. owing to adopt fluid bed furnace base fabric aerofoil layered arrangement, fuel, cloth wind branch multilayer are sent into, improve fuel and Air mixing operating mode in the stove, give full play to the advantage of recirculating fluidized bed space multistory burning, help improving the efficiency of combustion of large circulating fluidized bed boiler and the ability of pollutant control, can realize that recirculating fluidized bed maximizes, under the situation that increases furnace depth, realize the uniformity and the penetration capacity of the air distribution of secondary or tertiary air;
2, air distribution plate layered arrangement, air distribution plate belongs to a burner hearth up and down, and therefore the mixing of materials in the form of the material of upper wind plate layer by overflow and the following air distribution plate layer can be avoided resembling existing " pants " burner hearth and scurry bed and the danger of tilting table.The pressure control of burner hearth is the same with common single burner hearth bed pressure-controlled, as long as the pressure of air distribution plate layer under the control;
3, in running, coarse granule concentrates on down the bottom of air distribution plate layer and carries out fluidized bed combustion, realizes that coarse granule bed and fine grained bed divide open shop, and descends air distribution plate to be placed on the middle part of burner hearth, can alleviate the wearing and tearing of coarse granule to boiler;
4, the area of each air distribution plate is reduced, help even air distribution of burner hearth and even fluidisation, improve the fluidization quality of CFBB, especially for large circulating fluidized bed boiler, the air distribution plate layered arrangement has outstanding advantage;
5, the present invention is divided into separate 3 or a plurality of fluidisation bed surface that connects each other that have with single burner hearth, the adding of the fuel of boiler, air distribution, returning charge and lime stone can be carried out flexible modulation according to the combustion case of each bed surface, and the burning of boiler hierarchical classification, layering air-supply can be controlled NOx and SO better
2Discharging;
6, because the characteristics of recirculating fluidized bed kernel circulating combustion, by layering cloth wind, after the layered fluidized burning, regulate the interior circulation of boiler by the fluidisation air quantity of air distribution plate about regulating, regulate the burning and the heat-transfer character of burner hearth, this point can't realize in the CFBB of other form;
7, during boiler startup, can realize the igniting of branch bed, can adopt in the start-up course and at first heat the bottom fluid bed, start after the fluid bed of bottom, by the bottom fluid bed upper fluid-bed of igniting, because the bottom fluidized bed area is little, the startup bed material of adding is few, therefore boiler startup is fast, saves boiler startup with oily;
8, reduce the Boiler High Pressure consumption of wind for the first time, according to the pressure distribution characteristics of burner hearth, upper boiler wind can the lower tertiary air of working pressure, distributes by rational air quantity, can significantly reduce the power consumption of boiler fan system;
9, after the employing air distribution plate layered arrangement, furnace depth is not subjected to the restriction of secondary wind penetration capacity, therefore can reduce large circulating fluidized bed boiler furnace width size choosing of size of burner hearth, is convenient to the layout and the design of burner hearth buckstay.
Description of drawings
Fig. 1 is " pants " double-furnace structure schematic diagram;
Fig. 2 is the method for arranging structural representation of layered fluidization air distribution plate of fluidized bed boiler.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
As shown in Figure 2, method for arranging structural representation for layered fluidization air distribution plate of fluidized bed boiler, a kind of method for arranging of fluidized-bed combustion boiler furnace bottom air distribution plate adopts layered arrangement, realizes CFBB classification refuelling, air stage feeding and fractional combustion, and its method is:
Step 1. is put first air distribution plate 1, second air distribution plate 2 and the 3rd air distribution plate 3 at the burner hearth base fabric of boiler furnace 4, first air distribution plate 1 is arranged in the foot of boiler furnace 4, be following air distribution plate layer, arrange second air distribution plate 2 and the 3rd air distribution plate 3 in the top bilateral symmetry of first air distribution plate 1, communicate with first air distribution plate, 1 both sides, form the upper wind plate layer, be respectively equipped with a weir 10 between second air distribution plate 2, the 3rd air distribution plate 3 bottoms and first air distribution plate 1;
Step 3. is arranged second fuel inlet 7 at second air distribution plate 2 and the 3rd air distribution plate 3 outer lower portion, arranges second fuel inlet 7 and tertiary air import 11 in outer upper.
During work, one time wind is sent into from the air compartment 6 of bottommost air distribution plate 1, a wind is carried oxygen-supplying amount for burning after by the blast cap of air distribution plate 1, part of fuel, secondary wind, the returning charge of material returning device returning charge and external heat exchanger is from first fuel inlet 7 on the top of air distribution plate 1, the first secondary wind inlet 8 and material returning device returning charge import 9 add, because the following air distribution plate degree of depth that air distribution plate layer 1 forms is less, therefore after secondary wind adds can with fuel, material evenly mixes, this regional bed temperature can pass through coal-supplying amount, flexible modulation is carried out in air quantity and returning charge, the boiler slag removal mouth is arranged on down the bottom of air distribution plate 1, by deslagging control bed layer pressure.Part of fuel, secondary wind and tertiary air enter from second fuel inlet 7, the second secondary wind inlet 8, the tertiary air import 11 of the both sides of upper wind plate layer, burnt fuel by following air distribution plate 1 is lighted, this air distribution plate layer is because particle is thin, material level is low, use secondary wind to come fluidisation, the air distribution on top can the lower tertiary air of working pressure, the present invention adopts ladder to arrange, realize CFBB classification refuelling, air stage feeding and fractional combustion, by air quantity and the fuel quantity of adjusting each air distribution plate, can realize that boiler evenly burns, even distributing wind.
Claims (2)
1. the method for arranging of a layered fluidization air distribution plate of fluidized bed boiler is characterized in that, adopts layered arrangement, realizes CFBB classification refuelling, air stage feeding and fractional combustion, and its method is:
Step 1. is put first air distribution plate (1), second air distribution plate (2) and the 3rd air distribution plate (3) at the burner hearth base fabric of boiler furnace (4), first air distribution plate (1) is arranged in the foot of boiler furnace (4), be following air distribution plate layer, arrange second air distribution plate (2) and the 3rd air distribution plate (3) in the top bilateral symmetry of first air distribution plate (1), communicate with first air distribution plate (1) both sides, form the upper wind plate layer, be respectively equipped with a weir (10) between second air distribution plate (2), the 3rd air distribution plate (3) bottom and first air distribution plate (1);
Step 2. is arranged a boiler slag removal mouth (5) and a wind air compartment (6) respectively in the bottom of first air distribution plate (1), arrange first fuel inlet (7), the first secondary wind inlet (8) and material returning device returning charge import (9) in first air distribution plate (1) both sides;
Step 3. is arranged the second secondary wind inlet (8) at second air distribution plate (2) and the 3rd air distribution plate (3) outer lower portion, arranges second fuel inlet (7) and tertiary air import (11) in outer upper.
2. the method for arranging of a kind of layered fluidization air distribution plate of fluidized bed boiler according to claim 1 is characterized in that, described upper wind plate layer is for trapezoidal, and following air distribution plate layer is for falling trapezoidal or rectangle.
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| CN200610118146A CN1948831B (en) | 2006-11-09 | 2006-11-09 | Arranging method of layered fluidization air distribution plate of fluidized bed boiler |
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| CN200610118146A CN1948831B (en) | 2006-11-09 | 2006-11-09 | Arranging method of layered fluidization air distribution plate of fluidized bed boiler |
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| CN1948831B true CN1948831B (en) | 2010-05-12 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101482264B (en) * | 2008-12-23 | 2010-06-02 | 哈尔滨工大格瑞环保能源科技有限公司 | Composite-bed low circulation fluidized bed boiler |
| CN101818894B (en) * | 2010-04-29 | 2011-10-26 | 清华大学 | Circulating fluidized bed boiler |
| DE102010028720A1 (en) * | 2010-05-07 | 2011-11-10 | Siemens Aktiengesellschaft | Method for operating a steam generator |
| CN104457290B (en) * | 2014-09-24 | 2016-01-06 | 株洲火炬工业炉有限责任公司 | The exhaust heat stepped recovery heat utilization device of Zinc volatilization kiln kiln slag |
| CN105387454B (en) * | 2015-12-13 | 2018-05-29 | 李培明 | A kind of multifunctional combination burning boiler |
| CN106929108A (en) * | 2017-04-19 | 2017-07-07 | 中国华能集团清洁能源技术研究院有限公司 | A kind of biomass and city solid waste comprehensive utilization device and method |
| CN107461737B (en) * | 2017-08-10 | 2019-02-22 | 北京一亚高科能源科技有限公司 | A kind of non-pressure air compartment |
| CN110160039A (en) * | 2018-02-14 | 2019-08-23 | 兖矿中科清洁能源科技有限公司 | Overhead burner pulverized-coal fired boiler and its control method |
| CN111121006B (en) * | 2018-11-01 | 2021-03-26 | 中国科学院工程热物理研究所 | Horizontal pulverized coal boiler and its control method |
| CN117663120A (en) * | 2023-12-25 | 2024-03-08 | 绿源能源环境科技集团有限公司 | Space free fluidization combustion method driven by kinetic potential energy conversion |
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