CN102635850A - Module amplification design based multi-hearth circulating fluidized bed boiler - Google Patents
Module amplification design based multi-hearth circulating fluidized bed boiler Download PDFInfo
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- CN102635850A CN102635850A CN2012101156677A CN201210115667A CN102635850A CN 102635850 A CN102635850 A CN 102635850A CN 2012101156677 A CN2012101156677 A CN 2012101156677A CN 201210115667 A CN201210115667 A CN 201210115667A CN 102635850 A CN102635850 A CN 102635850A
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Abstract
The invention discloses a module amplification design based multi-hearth circulating fluidized bed boiler, wherein a combustion chamber of the boiler consists of a plurality of hearths; the upper part (h/H<=1/3) of the combustion chamber is the communicated space of each hearth; the corresponding communicated space on the top of each hearth is provided with an outlet smokestack; the hearths can be internally provided with suspending screen heating surfaces; and the number of the hearths is at least two. The large circulating fluidized bed boiler combustion chamber provided by the invention meets the configuration requirement that as the increasing of evaporation quantity and the improving of evaporation parameters, the heating surface of the combustion chamber of the large circulating fluidized bed boiler increases, and meanwhile the module of the combustion chamber can be amplified; and the module amplification design based multi-hearth circulating fluidized bed boiler has the advantages of favorable secondary air penetration of the hearths, good bed material fluidized uniformity, flexible combustion tissue, large boiler load regulating range and the like.
Description
Technical field
The present invention relates to a kind of large circulating fluidized bed boiler, relate in particular to a kind of multiple hearth CFBB based on the module amplification design.
Background technology
Along with the development of CFBB technology, boiler capacity constantly increases, and boiler capacity and steam parameter are required to improve constantly, and need in the combustion chamber, arrange increasing heating surface.CFBB for the single burner hearth of tradition; Though can increase burner hearth evaporating heating surface area through increasing furnace height and sectional area; But because enlarge-effect; Gathering way all the time faster than the gathering way of water-cooling wall area of furnace(heat) liberation volume, therefore large-size circulating fluidized bed burner hearth need be arranged extra heating surface so that heat balance usually.Simultaneously, the recirculating fluidized bed of the single burner hearth in heavy in section exists bed material undercompounding and the not enough problem of secondary wind range.
The CFBB technical field has the different techniques scheme to solve the problem that the heavy in section burner hearth exists at present.Applicant Alstom proposes to be provided with in lower furnace portion the method (patent publication No. CN1643302A) of separator, and bed surface is divided into two parts, and vertical burner hearth vertically is provided with the heat-exchange tube panel on the separator, as the extended surface of water-cooling wall.Applicant Xi'an Thermal Power Research Institute Co., Ltd. proposes the CFBB (patent publication No. CN1621740A) of band curtain wall structure; Can adopt a full partition wall heating surface that burner hearth is divided into two independent sectors; Perhaps adopt the wrong arranged of a plurality of half partition wall heating surfaces, burner hearth still is the mode of one.Also propose simultaneously the scheme of overfiren air port to burner hearth center air feed to be set at complete reverse V-shaped position, partition wall bottom.Applicant Institute of Engineering Thernophysics, Academia Sinica proposes a kind of large circulating fluidized bed boiler structure (patent publication No. CN102226518A) of annular furnace; Utilize the annular furnace structure to reduce the requirement to the secondary wind range, polygonal water-cooling wall then adapts to many separator arrangement of large circulating fluidized bed boiler simultaneously.
Comprehensive existing various technical schemes; The large circulating fluidized bed boiler furnace heating surface is arranged, secondary wind penetrates and bed material mixed problem in order to solve; Generally take in burner hearth, to be provided with the method for heating surface separator, reduce requirement, find that there is the phenomenon of bed material tilting table in this scheme but put into practice to the secondary wind range as adopting the bottom structure of breeches leg; The bed material that is a side leg of burner hearth is all translated into the opposite side supporting leg, makes the boiler operatiopn difficulty.Another kind method; Though being set, the method for partition wall heating surface more heating surfaces are provided for burner hearth in burner hearth; But partition wall is in the material concentration, the temperature distribution evenness variation that cause in varying degrees in the burner hearth, and the partition wall heating surface exists penetrating also of wear problem and secondary wind to be affected under the gas-solid flow of high concentration washes away simultaneously.For polygon annular furnace structure, though annular furnace can solve the penetration problem of secondary wind, the gas-solid uniform distribution problem of the even mixing of its material and many separators remains to be investigated.These modes all are based on to increase for the mode of CFBB dilatation and manage in burner hearth that again the heating surface thinking is set on the single size of burner hearth basis and carry out.
Summary of the invention
Above-mentioned deficiency to prior art exists the invention provides a kind of large-scale multiple hearth CFBB based on the module amplification design.Mentality of designing of the present invention is on the ripe CFBB of constant volume basis, adopts module to amplify mode Extended Cyclic fluidized-bed combustion boiler capacity, satisfies Scale-up of Circulating Fluidized Bed Boiler and high parameter development.
A kind of multiple hearth CFBB based on the module amplification design comprises boiler furnace, and described combustion chamber is made up of at least two burner hearths that are arranged in parallel, and the top between two adjacent burner hearths is provided with connected space.
The height of said burner hearth equates.Adopt the burner hearth that highly equates, can reduce the difference of the material composition in each fire box, thereby guarantee to have identical burning situation between the multiple hearth.
Two adjacent roof of the furnaces are interconnected and form described connected space, and the height of described connected space is not more than 1/3 of said combustion chamber height.Flue gas and circulation fluidized bed material particle in adjacent two burner hearths can exchange each other in the connected space of roof of the furnace, evenly mix, to avoid because the separator gas-solid that the deviation of the deviation of the air distribution of each burner hearth and coal-supplying amount or combustion position causes distribution deviation.The height of selecting connected space is that to be not more than 1/3 of combustion chamber height be when guaranteeing that the roof of the furnace gas-solid mixes, and the more coarse grained mutual exchange of restriction lower furnace portion has avoided being similar to the bed material tilting table problem of pants leg furnace boiler.
Be provided with 1～2 outlet smokestack in the corresponding connected space of said roof of the furnace, said outlet smokestack is connected with cyclone separator.It is that the great amount of high-temperature solid material is separated from the air-flow of furnace outlet that cyclone separator mainly acts on, and sends burner hearth back to through material-returning device, and to keep the combustion chamber fast fluidized condition, fuel agent and desulfurizing agent repeatedly circulate, and burns repeatedly and reacts.
Be provided with some suspentions screen in the said burner hearth, the suspention screen shields for the L type suspention screen of drawing from water-cooling wall and furnace roof or for the U type suspention of drawing from furnace roof.Along with the increase of CFBB capacity, the heat release volume of burner hearth increases sooner than the evaporating heating surface in the stove, causes the heat imbalance problem of heat release greater than heat absorption.Heavy duty boiler needs in main circulation loop, to arrange that extra heating surface absorbs a part of heat, to guarantee best fire box temperature and excess air coefficient.Arrange that in upper furnace the suspention screen is a kind of effective heating surface arrangement, except simplifying the system, the vapor (steam) temperature when also helping the boiler at low load operation reaches nominal parameter.
Described burner hearth bottom is provided with independently wind air compartment.In the CFBB, primary air fan generally adopts the big capacity centrifugal blower of high pressure.The wind that primary air fan is seen off mainly is to get into a wind air compartment, gets into burner hearth through air-distribution device (blast cap), makes the bed materials flowization in the burner hearth, the adjusting situation of bed temperature in the fluidisation situation of the size decision implantation material of primary air velocity and the stove.Still the light a fire wind regime of blower fan and coal spread wind machine of a wind, therefore, the consumption of a wind is maximum in CFBB.The resistance of the import of the air preheater of CFBB is bigger; Vibration at the inlet flue duct of air preheater also is maximum in the vibration in all flues; Guider generally all is housed herein; To reduce its vibration, when operation, also should under the prerequisite that does not influence its flow, reduce the pressure head of a wind as far as possible.
The both sides of described burner hearth bottom are provided with the equally distributed overfire air port of several layers.The overfire air fan of CFBB mainly is that the combustion air that boiler is required is sent into burner hearth.Side is furnished with bilevel overfiren air port in the front and back of burner hearth, and following overfiren air port also is the boundary sign of interior emulsion zone of stove and dilute-phase zone.The wind that overfire air fan is seen off gets into burner hearth through overfiren air port after the air preheater heating, participate in the burning in the stove, reaches combustion-supporting effect.
Said every layer overfire air port is several even distributions.Every layer of equally distributed overfire air port can guarantee that the secondary wind energy gets into burner hearth from different perspectives, and guaranteeing has sufficient combustion air to send in the burner hearth, also can make the substance combustion in the burner hearth abundant simultaneously.
Be provided with the partition wall that both sides burner hearth flue gas is isolated in the described connected space.Can be used as the part of hot heating surface of boiler evaporating heating surface or mistake/again at the partition wall of connected space, it is in order to make full use of the exchange capability of heat of the high-temperature flue gas in the connected space, the heat in the burner hearth to be passed to working medium more that partition wall is set.
The present invention has following beneficial effect: proposed by the invention is a kind of design of combustion chamber of big capacity high parameter type CFBB; Boiler capacity expansion design clear thinking is simple; Satisfy the heating surface arrangement requirement of large circulating fluidized bed boiler combustion chamber, can carry out the module of combustion chamber simultaneously and amplify; Advantages such as it is good to have burner hearth secondary wind penetrability, and bed materials flow good uniformity burns tissue flexibly, and load range of boiler is big.
Description of drawings
Fig. 1 is the apparatus structure sketch map of the embodiment 1 of CFBB of the present invention.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the apparatus structure sketch map of the embodiment 2 of CFBB of the present invention.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 is the apparatus structure sketch map of the embodiment 3 of CFBB of the present invention.
Fig. 6 is the vertical view of Fig. 5.
Fig. 7 is the apparatus structure sketch map of the embodiment 4 of CFBB of the present invention.
Fig. 8 is the vertical view of Fig. 7.
Fig. 9 is the apparatus structure sketch map of the embodiment 5 of CFBB of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description:
As depicted in figs. 1 and 2; Combustion chamber based on the multiple hearth CFBB of module amplification design is made up of three burner hearths 1; Three burner hearths 1 are highly equal; The connected space 2 of top of combustion chamber connects two adjacent burner hearths 1, and the height of connected space 2 is not more than 1/3 (h/H≤1/3) of said combustion chamber height, is provided with 2 outlet smokestacks 3 in each burner hearth 1 corresponding connected space 2; Outlet smokestack 3 links to each other with cyclone separator 4, and the combustion chambers burn product leads to six cyclone separators 4 through outlet smokestack 3.
The top of each burner hearth 1 is furnished with five suspention screens 5, and suspention screen 5 leads to burner hearth 1 by wall behind the water-cooling wall 7 and furnace roof 11.The bottom of burner hearth 1 and both sides are provided with independently wind air compartment 9 and overfire air port 10 respectively, 10 fens two-layer layouts of overfire air port, and every layer of overfire air port 10 quantity are four.
The boiler capacity of this instance is 2000～3000t/h, and generated output is 600～800MW.The boiler furnace structure of this instance has that bed material is grain fluidized evenly, the secondary wind penetration performance is good and advantage such as the coal combustion situation is good, can not cause that bed expects the problem of tilting table simultaneously.
Like Fig. 3 and shown in Figure 4; Combustion chamber based on the multiple hearth CFBB of module amplification design is made up of two burner hearths 1, and two burner hearths 1 are highly equal, and top of combustion chamber is the connected space 2 of burner hearth 1; The height of connected space 2 is not more than 1/3 (h/H≤1/3) of said combustion chamber height; Each burner hearth 1 corresponding connected space 2 is provided with 2 outlet smokestacks 3, and outlet smokestack 3 is provided with cyclone separator 4, and the combustion chambers burn product leads to four cyclone separators 4 through outlet smokestack 3.
The top of each burner hearth 1 is furnished with five suspention screens 5, and suspention screen 5 leads to burner hearth 1 by wall behind the water-cooling wall 7 and furnace roof 11.The bottom of burner hearth 1 and both sides are provided with independently wind air compartment 9 and overfire air port 10 respectively, 10 fens two-layer layouts of overfire air port, and every layer of overfire air port 10 quantity are four.
The boiler capacity of this instance is 1000～2000t/h, and generated output is 300～600MW.
Like Fig. 5 and shown in Figure 6; Combustion chamber based on the multiple hearth CFBB of module amplification design is made up of three burner hearths 1; Three burner hearths 1 are highly equal; The connected space 2 of top of combustion chamber connects two adjacent burner hearths 1, and the height of connected space 2 is not more than 1/3 (h/H≤1/3) of said combustion chamber height, is provided with 1 outlet smokestack 3 in each burner hearth 1 corresponding connected space 2; Outlet smokestack 3 links to each other with cyclone separator 4, and the combustion chambers burn product leads to 3 cyclone separators 4 through outlet smokestack 3.
The top of each burner hearth 1 is furnished with three suspention screens 5, and suspention screen 5 leads to burner hearth 1 by wall behind the water-cooling wall 7 and furnace roof 11.The bottom of burner hearth 1 and both sides are provided with independently wind air compartment 9 and overfire air port 10 respectively, 10 fens two-layer layouts of overfire air port, and every layer of overfire air port 10 quantity are two.
The boiler capacity of this instance is 1000～2000t/h, and generated output is 300～600MW.
Like Fig. 7 and shown in Figure 8; Combustion chamber based on the multiple hearth CFBB of module amplification design is made up of three burner hearths 1; Three burner hearths 1 are highly equal; The connected space 2 of top of combustion chamber connects two adjacent burner hearths 1, and the height of connected space 2 is not more than 1/3 (h/H≤1/3) of said combustion chamber height, is provided with 2 outlet smokestacks 3 in each burner hearth 1 corresponding connected space 2; Outlet smokestack 3 links to each other with cyclone separator 4, and the combustion chambers burn product leads to six cyclone separators 4 through outlet smokestack 3.
The top of each burner hearth 1 is furnished with five suspention screens 5, and suspention screen 5 leads to burner hearth 1 by furnace roof 11.The bottom of burner hearth 1 and both sides are provided with independently wind air compartment 9 and overfire air port 10 respectively, 10 fens two-layer layouts of overfire air port, and every layer of overfire air port 10 quantity are four.
As shown in Figure 9; Combustion chamber based on the multiple hearth CFBB of module amplification design is made up of three burner hearths 1; Three burner hearths 1 are highly equal, and the connected space 2 of top of combustion chamber connects two adjacent burner hearths 1, and the height of connected space 2 is not more than 1/3 (h/H≤1/3) of said combustion chamber height; Be provided with the partition wall 8 that the both sides flue gas is isolated in the connected space 2, partition wall 8 is parallel to wall 7 behind water-cooling wall front wall 6 and the water-cooling wall.Be provided with 2 outlet smokestacks 3 in each burner hearth 1 corresponding connected space 2, outlet smokestack 3 links to each other with cyclone separator 4, and the combustion chambers burn product leads to six cyclone separators 4 through outlet smokestack 3.
The top of each burner hearth 1 is furnished with five suspention screens 5, and suspention screen 5 leads to burner hearth 1 by wall behind the water-cooling wall 7 and furnace roof 11.The bottom of burner hearth 1 and both sides are provided with independently wind air compartment 9 and overfire air port 10 respectively, 10 fens two-layer layouts of overfire air port, and every layer of overfire air port 10 quantity are four.
Claims (10)
1. the multiple hearth CFBB based on the module amplification design comprises boiler furnace, it is characterized in that, described combustion chamber is made up of at least two burner hearths that are arranged in parallel, and the top between two adjacent burner hearths is provided with connected space.
2. the multiple hearth CFBB based on the module amplification design as claimed in claim 1 is characterized in that, the height of said burner hearth equates.
3. the multiple hearth CFBB based on the module amplification design as claimed in claim 1 is characterized in that the height of described connected space is not more than 1/3 of said combustion chamber height.
4. like claim 2 or 3 described multiple hearth CFBBs, it is characterized in that be provided with 1～2 outlet smokestack in the corresponding connected space of said roof of the furnace, said outlet smokestack is connected with cyclone separator based on the module amplification design.
5. the multiple hearth CFBB based on the module amplification design as claimed in claim 1 is characterized in that, is provided with some suspention screens in the said burner hearth.
6. the multiple hearth CFBB based on the module amplification design as claimed in claim 1 is characterized in that, described suspention screen shields for the L type suspention screen of drawing from water-cooling wall and furnace roof or for the U type suspention of drawing from furnace roof.
7. the multiple hearth CFBB based on the module amplification design as claimed in claim 1 is characterized in that, described burner hearth bottom is provided with independently wind air compartment.
8. the multiple hearth CFBB based on the module amplification design as claimed in claim 1 is characterized in that the both sides of described burner hearth bottom are provided with the equally distributed overfire air port of several layers.
9. the multiple hearth CFBB based on the module amplification design as claimed in claim 8 is characterized in that, said every layer overfire air port is several even distributions.
10. the multiple hearth CFBB based on the module amplification design as claimed in claim 1 is characterized in that, is provided with the partition wall that both sides burner hearth flue gas is isolated in the described connected space.
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| CN2012101156677A CN102635850A (en) | 2012-04-19 | 2012-04-19 | Module amplification design based multi-hearth circulating fluidized bed boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157021A (en) * | 2015-09-15 | 2015-12-16 | 清华大学 | Double-hearth circulating fluidized bed boiler |
| CN108361685A (en) * | 2018-04-13 | 2018-08-03 | 常州能源设备总厂有限公司 | Parallel-connection type coal-burning powder heat medium heater and its heat supply method |
| CN113757649A (en) * | 2021-09-16 | 2021-12-07 | 东方电气集团东方锅炉股份有限公司 | 1000 MW-grade ultra-supercritical circulating fluidized bed boiler |
| CN114110575A (en) * | 2021-11-15 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Ultra-large circulating fluidized bed boiler |
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| CN202546741U (en) * | 2012-04-19 | 2012-11-21 | 浙江大学 | Multi-hearth circulating fluidized bed boiler based on module amplification design |
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| SU1150433A1 (en) * | 1983-04-06 | 1985-04-15 | Уральский Филиал Всесоюзного Дважды Ордена Трудового Красного Знамени Теплотехнического Научно-Исследовательского Института Им.Ф.Э.Дзержинского | Furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157021A (en) * | 2015-09-15 | 2015-12-16 | 清华大学 | Double-hearth circulating fluidized bed boiler |
| CN108361685A (en) * | 2018-04-13 | 2018-08-03 | 常州能源设备总厂有限公司 | Parallel-connection type coal-burning powder heat medium heater and its heat supply method |
| CN113757649A (en) * | 2021-09-16 | 2021-12-07 | 东方电气集团东方锅炉股份有限公司 | 1000 MW-grade ultra-supercritical circulating fluidized bed boiler |
| CN114110575A (en) * | 2021-11-15 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Ultra-large circulating fluidized bed boiler |
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Application publication date: 20120815 |