CN105674256A - Quick-start system and method for circulating fluidized bed boilers - Google Patents
Quick-start system and method for circulating fluidized bed boilers Download PDFInfo
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- CN105674256A CN105674256A CN201510842228.XA CN201510842228A CN105674256A CN 105674256 A CN105674256 A CN 105674256A CN 201510842228 A CN201510842228 A CN 201510842228A CN 105674256 A CN105674256 A CN 105674256A
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Abstract
The invention discloses a quick-start system and method for circulating fluidized bed boilers. Ash outlets of dust removers of the multiple circulating fluidized bed boilers communicate with an ash bank and further communicate with hearths of the boilers. Fly ash collected by the dust removers can be conveyed to the ash bank and also can be conveyed to the hearths of the boilers. When one boiler is started, the quantity of fed coal is small, the particle concentration inside the corresponding hearth is low, and the boiler has an overheat risk so that the load cannot be quickly increased; at the moment, fly ash collected by the boiler dust removers, which normally operate, of the adjacent boilers is conveyed into the hearth of the started boiler, the ash concentration in the hearth of the started boiler is increased, ash balance of the started boiler is quickly achieved, and the overheat coking problem caused by the low ash concentration in the hearth is solved; loads of the boilers can be quickly increased, starting time of the boilers is effectively shortened, and the steam production quantity of the boilers is increased; meanwhile, the overheat coking risk in the boiler starting process is lowered, and boiler operation safety is improved.
Description
Technical field
The present invention relates to circular fluid bed running technology field, specifically belong to a kind of circular fluid bed swift start up system and method.
Background technology
Circular fluid bed, as a kind of cleaning combustion devices, obtains in China during the last ten years recently and applies on a large scale. According to incompletely statistics, the circular fluid bed of the various capacity put into operation in China is more than 3000, and circular fluid bed Baima supercritical circulating fluidized bed demonstration project of 600MW that wherein worldful is maximum successfully put into production in 2013.
Circular fluid bed belongs to low-temperature burning, and fire box temperature is lower than 1000 DEG C, and in stove, heat exchange had both comprised radiation heat transfer, comprised again convective heat exchange, and wherein in stove, heat exchange in stove is had material impact by granule density. Granule density height in stove, in stove, exchange capability of heat is strong, the fire box temperature of boiler can maintain in normal operation range, if granule density is too low in stove, in stove, exchange capability of heat heat absorption capacity poor, heating surface is not enough, fire box temperature will be caused to be difficult to control, furnace temperature overtemperature, boiler coke blowing out fault will even occur.
In order to maintain the normal furnace temperature of boiler, circular fluid bed starts needs and takes following measure: before (1) boiler startup, adds a certain amount of material, there to be enough ash concentrations during boiler startup in burner hearth in burner hearth; (2) in boiler startup process, in burner hearth, interpolation bed material is supplemented, to maintain the concentration of furnace ash of burner hearth start-up course; (3) when boiler temperature meets throwing coal condition, throw coal as early as possible, utilize the bed material of coal ash supplement boiler, but, must slowly increase coal-supplying amount, slowly increase load, avoid owing to boiler coal feeding amount is excessive that boiler bed material is not enough, burner hearth internal heat ability generation overtemperature coking problem.
By above-mentioned measure, although the object that circular fluid bed starts can be realized, but the circular fluid bed Starting mode Shortcomings that this kind is traditional.
Go at boiler startup and in burner hearth, add certain bed material Shortcomings. Mainly contain the mode that two kinds are added bed material in burner hearth at present: artificial interpolation bed material mode and machinery add bed material mode.The steam production of circulating fluidized bed boiler of power station is generally at more than 400t/h, and even up to 2000t/h, boiler startup goes to the bed material added in burner hearth up to ton up to a hundred. If adopting artificial interpolation bed material, labour intensity is very big, is totally-enclosed space in burner hearth, and working conditions is very severe; If adopting machinery to add bed material, general employing pneumatic conveying mode is stored in, by getting ready in advance, the bed material started in bed feed bin and is transported in burner hearth. Owing to the average particle size of bed material is about 3mm to 5mm, the bed material of volume particle size like this adopts pneumatic conveying mode to carry, difficulty of transportation, length consuming time. For the circular fluid bed of boiler capacity at 400t/h, whether manual type is gone to bed material, or mechanical system is gone to bed material, generally consuming time all more than 10 hours, is unfavorable for that boiler starts fast.
When boiler startup process does not possess throwing coal condition, the general heat boiler relying on oil inflame release. Owing to fuel oil almost not having ash content, oil inflame not only can not increase the bed material of boiler, and the fan of boiler and induced draft fan all open, open the startup bed material, especially carefully the bed material that add in stove in stokehold to be taken away by flue gas, fine particle in burner hearth is fewer and feweri, causes the ash concentration of burner hearth to reduce gradually. For this reason, boiler needs to add more bed material before activation, adds bed material consuming time longer.
Boiler startup process is added bed material Shortcomings in boiler. Start the slag of discharge when bed material generally normally runs from boiler, after screening, the small-particle being applicable to doing boiler startup bed material is screened, it is prestored to and starts in bed feed bin, the startup bed feed bin needing volume bigger and screening system, also needing occupied ground, initial cost is higher, system complex, failure rate height.
Boiler startup process is added coal-fired supplementary bed material Shortcomings in burner hearth. In boiler startup process, required consumption of coal is less, the coal ash of the generation after coal combustion bed material as a supplement, it is necessary to long time integration could meet the requirement of the concentration of furnace ash. Owing to the ash concentration in this stage stove is low, in stove, exchange capability of heat is poor, the suction thermal Finite of heating surface in stove, once throw coal speed excessive, be very easy to cause burner hearth overtemperature coking. For this reason, when boiler startup, it is necessary to slowly increasing to coal speed, slowly increase boiler load, boiler takes long enough just can reach at full capacity.
In sum, the startup of circular fluid bed exists to add and starts that length consuming time expected by bed, required time is long at full capacity from boiler startup to band, and has that the concentration of furnace ash is on the low side, boiler exists overtemperature and the problem such as coking risk.
Summary of the invention
A kind of circular fluid bed swift start up system and method are it is an object of the invention to provide, overcome the deficiencies in the prior art, reasonable in design, the remover ash discharge dust mouth of multiple stage circular fluid bed is connected with ash storehouse, also it is connected with the burner hearth of boiler, the flying dust that fly-ash separator is collected can be delivered to ash storehouse, it is also possible to is delivered to the burner hearth of boiler. When certain boiler startup, coal feeding amount is few, and burner hearth internal particle concentration is low, and boiler exists overtemperature risk can not load up fast; Now, the fly ash carry of the boiler dust remover trapping normally run by adjacent stove is to the boiler furnace of this startup, improve the ash concentration of this starting trouble burner hearth inside, making this boiler started set up grey balance fast, avoid burner hearth to cause overtemperature coking problem owing to ash concentration is low, boiler can fast lifting load, effectively shorten the start time of boiler, improve the steam production of boiler, reduce the overtemperature coking risk in boiler startup process, it is to increase the security of boiler operatiopn simultaneously.
The technical solution used in the present invention is as follows:
A kind of circular fluid bed swift start up system, comprise A stove and B stove, it is characterized in that: described A stove is connected with A stove remover ash discharge dust mouth and B stove remover ash discharge dust mouth respectively by A stove ash inlet tube, described B stove is connected with A stove remover ash discharge dust mouth and B stove remover ash discharge dust mouth respectively by B stove ash inlet tube; Described A outlet of still is connected with the import of A stove cyclonic separator, the outlet of described A stove cyclonic separator is connected with A back-end ductwork import, the outlet of described A stove back-end ductwork is connected with A stove fly-ash separator import, and the ash discharging hole of described A stove fly-ash separator is connected with A stove by A stove ash inlet tube respectively, is connected with B stove by B stove ash inlet tube, is connected with Hui Ku by ash pipeline; Described B outlet of still is connected with the import of B stove cyclonic separator, the outlet of B stove cyclonic separator is connected with B stove back-end ductwork import, the outlet of B stove back-end ductwork is connected with B stove fly-ash separator import, and the ash discharging hole of B stove fly-ash separator is connected with B stove by B stove ash inlet tube respectively, is connected with A stove by A stove ash inlet tube, is connected with Hui Ku by ash pipeline.
Described A stove remover ash discharge dust mouth and the connecting tube of A stove ash inlet tube arrange A stove and returns ash valve, the connecting tube of A stove remover ash discharge dust mouth and ash pipeline arranges A stove and enters ash storehouse valve, the connecting tube of A stove remover ash discharge dust mouth and B stove ash inlet tube arranges A stove and enters B stove and return grey valve.
Described B stove remover ash discharge dust mouth and the connecting tube of B stove ash inlet tube arrange B stove and returns ash valve, the connecting tube of B stove remover ash discharge dust mouth and ash pipeline arranges B stove and enters ash storehouse valve, the connecting tube of B stove remover ash discharge dust mouth and A stove ash inlet tube arranges B stove and enters A stove and return grey valve.
Arranging A stove heating surface in described A stove, A outlet of still is connected with the import of A stove cyclonic separator, and the outlet of A stove cyclonic separator is connected with A stove material returning device import, and the outlet of A stove material returning device is connected with A stove import.
Arranging B stove heating surface in described B stove, B outlet of still is connected with the import of B stove cyclonic separator, and the outlet of B stove cyclonic separator is connected with B stove material returning device import, and the outlet of B stove material returning device is connected with B stove import.
A kind of circular fluid bed quick start method, comprise the following steps: fuel and air are in A stove combustion, products of combustion flue gas carries bed material, coal ash, the particles such as sweetening agent move to A stove top, and to A stove heating surface heat release, flue gas carries particle and leaves A stove afterwards, enter into A stove cyclonic separator, the coarse particles that flue gas carries is trapped by A stove cyclonic separator and returns A stove through A stove material returning device, the fine particle that flue gas carries and flue gas enter A stove back-end ductwork after together leaving A stove cyclonic separator, A stove fly-ash separator is entered after completing heat release, the most fine particles carried in flue gas are collected by A stove fly-ash separator, the fine particle collected is discharged through A stove remover ash discharge dust mouth, fuel and air are in B stove combustion, products of combustion flue gas carries bed material, coal ash, the particles such as sweetening agent move to B stove top, and to B stove heating surface heat release, flue gas carries particle and leaves B stove afterwards, enter into B stove cyclonic separator, the coarse particles that flue gas carries is trapped by B stove cyclonic separator and returns B stove through B stove material returning device, the fine particle that flue gas carries and flue gas enter B stove back-end ductwork after together leaving B stove cyclonic separator, B stove fly-ash separator is entered after completing heat release, the most fine particles carried in flue gas are collected by B stove fly-ash separator, the fine particle collected is discharged through B stove remover ash discharge dust mouth,
When B stove normally runs, when starting A stove, start following step: when A stove starts, the coal feeding amount of A stove is few, granule density in A stove is low, low to the heat release ability of A stove heating surface at the flue gas of A stove (A1) and the particle that carries thereof, if now throwing in a large amount of coal in A stove, fire box temperature increases fast, it is easy to cause particle overtemperature to cause the faults such as coking; Close A stove and enter ash storehouse valve, open A stove and return ash valve, the fine particle that A stove fly-ash separator is collected is delivered to A stove by A stove ash inlet tube; Cut out B stove enters ash storehouse valve and B stove returns ash valve, and unlatching B stove enters A stove and returns ash valve, and by A stove ash inlet tube, the fine particle of B stove fly-ash separator collection is delivered to A stove; The fine particle collected by the fine particle collected by A stove fly-ash separator and B stove fly-ash separator is delivered to A stove, effectively improves the granule density of A stove, it is to increase flue gas in A stove and particle are to the thermal discharge of A stove heating surface; When the granule density of A stove is enough high, strengthen to the throwing coal speed of A stove, A stove not overtemperature when start A stove fast.
When A stove normally runs, when starting B stove, start following step: when B stove starts, the coal feeding amount of B stove is few, granule density in B stove is low, low to the heat release ability of B stove heating surface at the flue gas of B stove and the particle that carries thereof, if now throwing in a large amount of coal in B stove, fire box temperature increases fast, it is easy to cause particle overtemperature to cause the faults such as coking; Close B stove and enter ash storehouse valve, open B stove and return ash valve, the fine particle that B stove fly-ash separator is collected is delivered to B stove by B stove ash inlet tube; Cut out A stove enters ash storehouse valve and A stove returns ash valve, and unlatching A stove enters B stove and returns ash valve, and by B stove ash inlet tube, the fine particle of A stove fly-ash separator collection is delivered to B stove; The fine particle collected by the fine particle collected by B stove fly-ash separator and A stove fly-ash separator is delivered to B stove, effectively improves the granule density of B stove, it is to increase flue gas in B stove and particle are to the thermal discharge of B stove heating surface; When the granule density of B stove is enough high, strengthen to the throwing coal speed of B stove, B stove not overtemperature when start B stove fast.
Compared with the prior art, the useful effect of the present invention is as follows:
1) in the start-up course of boiler, the fly ash carry collected by the boiler dust remover that adjacent stove normally runs is in starting trouble, improve the concentration of furnace ash of starting trouble fast, solve that the concentration of furnace ash in boiler startup process is low, load up speed is slow, the problem that opens stove time length, also reduces in boiler startup process the risk of the burner hearth overtemperature coking caused owing to the concentration of furnace ash is low.
2) the invention solves that circular fluid bed coal-supplying amount in start-up course increases slowly, load increases slowly, a normal ash working cycle difficult problem slowly set up by boiler, it is possible to make boiler set up normal grey balance in start-up course fast. Therefore, after adopting the present invention, it is possible to significantly reduce the bed material addition before boiler startup, not only save workload, also significantly shorten interpolation in stove and start bed material required time, it is possible to boiler is put into operation fast.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
A1-A stove, A2-A stove material returning device, A3-A stove ash inlet tube, A4-A stove returns ash valve, A5-B stove enters A ashes valve, A6-A stove enters ash storehouse valve, A7-A stove cyclonic separator, A8-A stove back-end ductwork, A9-A stove fly-ash separator, A10-A stove remover ash discharge dust mouth, A11-A stove heating surface, B1-B stove, B2-B stove material returning device, B3-B stove ash inlet tube, B4-B stove returns ash valve, B5-A stove enters B ashes valve, B6-B stove enters ash storehouse valve, B7-B stove cyclonic separator, B8-B stove back-end ductwork, B9-B stove fly-ash separator, B10-B stove remover ash discharge dust mouth, B11-B stove heating surface, C1-ash pipeline, C2-ash storehouse
Embodiment
FIGS, a kind of circular fluid bed swift start up system, comprise A stove (A1) and B stove (B1), it is characterized in that: described A stove (A1) is connected with A stove remover ash discharge dust mouth (A10) and B stove remover ash discharge dust mouth (B10) respectively by A stove ash inlet tube (A3), described B stove (B1) is connected respectively with A stove remover ash discharge dust mouth (A10) and B stove remover ash discharge dust mouth (B10) by B stove ash inlet tube (B3);Described A stove (A1) outlet is connected with the import of A stove cyclonic separator (A7), the outlet of described A stove cyclonic separator (A7) is connected with A stove back-end ductwork (A8) import, the outlet of described A stove back-end ductwork (A8) is connected with A stove fly-ash separator (A9) import, and the ash discharging hole (A10) of described A stove fly-ash separator (A9) is connected with A stove (A1) by A stove ash inlet tube (A3) respectively, is connected with B stove (B1) by B stove ash inlet tube (B3), is connected with ash storehouse (C2) by ash pipeline (C1); Described B stove (B1) outlet is connected with the import of B stove cyclonic separator (B7), the outlet of B stove cyclonic separator (B7) is connected with B stove back-end ductwork (B8) import, the outlet of B stove back-end ductwork (B8) is connected with B stove fly-ash separator (B9) import, and the ash discharging hole (B10) of B stove fly-ash separator (B9) is connected with B stove (B1) by B stove ash inlet tube (B3) respectively, is connected with A stove (A1) by A stove ash inlet tube (A3), is connected with ash storehouse (C2) by ash pipeline (C1); The connecting tube of described A stove remover ash discharge dust mouth (A10) and A stove ash inlet tube (A3) arranges A stove and returns ash valve (A4), the connecting tube of A stove remover ash discharge dust mouth (A10) and ash pipeline (C1) arranges A stove and enters ash storehouse valve (A6), A stove remover ash discharge dust mouth (A10) and B stove ash inlet tube (B3)) connecting tube on A stove is set enters B stove and return ash valve (B5); The connecting tube of described B stove remover ash discharge dust mouth (B10) and B stove ash inlet tube (B3) arranges B stove and returns ash valve (B4), the connecting tube of B stove remover ash discharge dust mouth (B10) and ash pipeline (C1) arranges B stove and enters ash storehouse valve (B6), B stove remover ash discharge dust mouth (B10) and A stove ash inlet tube (A3)) connecting tube on B stove is set enters A stove and return ash valve (A5); A stove heating surface (A11) is arranged in described A stove (A1), A stove (A1) outlet is connected with the import of A stove cyclonic separator (A7), the outlet of A stove cyclonic separator (A7) is connected with A stove material returning device (A2) import, and A stove material returning device (A2) outlet is connected with A stove (A1) import; B stove heating surface (B11) is arranged in described B stove (B1), B stove (B1) outlet is connected with the import of B stove cyclonic separator (B7), the outlet of B stove cyclonic separator (B7) is connected with B stove material returning device (B2) import, and B stove material returning device (B2) outlet is connected with B stove (B1) import.
A kind of circular fluid bed quick start method, comprise the following steps: fuel and air are in A stove (A1) combustion, products of combustion flue gas carries bed material, coal ash, the particles such as sweetening agent move to A stove (A1) top, and to A stove heating surface (A11) heat release, flue gas carries particle and leaves A stove (A1) afterwards, enter into A stove cyclonic separator (A7), the coarse particles that flue gas carries is trapped by A stove cyclonic separator (A7) and returns A stove (A1) through A stove material returning device (A2), the fine particle that flue gas carries and flue gas enter A stove back-end ductwork (A8) after together leaving A stove cyclonic separator (A7), A stove fly-ash separator (A9) is entered after completing heat release, the most fine particles carried in flue gas are collected by A stove fly-ash separator (A9), the fine particle collected is discharged through A stove remover ash discharge dust mouth (A10), fuel and air are in B stove (B1) combustion, products of combustion flue gas carries bed material, coal ash, the particles such as sweetening agent move to B stove (B1) top, and to B stove heating surface (B11) heat release, flue gas carries particle and leaves B stove (B1) afterwards, enter into B stove cyclonic separator (B7), the coarse particles that flue gas carries is trapped by B stove cyclonic separator (B7) and returns B stove (B1) through B stove material returning device (B2), the fine particle that flue gas carries and flue gas enter B stove back-end ductwork (B8) after together leaving B stove cyclonic separator (B7), B stove fly-ash separator (B9) is entered after completing heat release, the most fine particles carried in flue gas are collected by B stove fly-ash separator (B9), the fine particle collected is discharged through B stove remover ash discharge dust mouth (B10),When B stove (B1) normally runs, when starting A stove (A1), start following step: when A stove starts, the coal feeding amount of A stove is few, granule density in A stove (A1) is low, low to the heat release ability of A stove heating surface (A11) at the flue gas of A stove (A1) and the particle that carries thereof, if now throwing in a large amount of coal in A stove (A1), fire box temperature increases fast, it is easy to cause particle overtemperature to cause the faults such as coking; Closing A stove and enter ash storehouse valve (A6), open A stove and return ash valve (A4), the fine particle collected by A stove fly-ash separator (A9) is delivered to A stove (A1) by A stove ash inlet tube (A3); Cut out B stove enters ash storehouse valve (B6) and B stove returns ash valve (B4), and unlatching B stove enters A stove and returns ash valve (A5), and the fine particle collected by B stove fly-ash separator (B9) is delivered to A stove (A1) by A stove ash inlet tube (A3); The fine particle collected by the fine particle collected by A stove fly-ash separator (A9) and B stove fly-ash separator (B9) is delivered to A stove (A1), effectively improve the granule density of A stove (A1), it is to increase flue gas in A stove (A1) and particle are to the thermal discharge of A stove heating surface (A11); When the granule density of A stove (A1) is enough high, strengthen to the throwing coal speed of A stove (A1), A stove (A1) not overtemperature when start A stove fast. When A stove (A1) normally runs, when starting B stove (B1), start following step: when B stove starts, the coal feeding amount of B stove is few, granule density in B stove (B1) is low, low to the heat release ability of B stove heating surface (B11) at the flue gas of B stove (B1) and the particle that carries thereof, if now throwing in a large amount of coal in B stove (B1), fire box temperature increases fast, it is easy to cause particle overtemperature to cause the faults such as coking; Closing B stove and enter ash storehouse valve (B6), open B stove and return ash valve (B4), the fine particle collected by B stove fly-ash separator (B9) is delivered to B stove (B1) by B stove ash inlet tube (B3); Cut out A stove enters ash storehouse valve (A6) and A stove returns ash valve (A4), and unlatching A stove enters B stove and returns ash valve (B5), and the fine particle collected by A stove fly-ash separator (A9) is delivered to B stove (B1) by B stove ash inlet tube (B3); The fine particle collected by the fine particle collected by B stove fly-ash separator (B9) and A stove fly-ash separator (A9) is delivered to B stove (B1), effectively improve the granule density of B stove (B1), it is to increase flue gas in B stove (B1) and particle are to the thermal discharge of B stove heating surface (B11); When the granule density of B stove (B1) is enough high, strengthen to the throwing coal speed of B stove (B1), B stove (B1) not overtemperature when start B stove fast.
The remover ash discharge dust mouth of multiple stage circular fluid bed is connected with ash storehouse, is also connected with the burner hearth of boiler, and the flying dust that fly-ash separator is collected can be delivered to ash storehouse, it is also possible to is delivered to the burner hearth of boiler. When certain boiler startup, coal feeding amount is few, and burner hearth internal particle concentration is low, and boiler exists overtemperature risk can not load up fast; Now, the fly ash carry of the boiler dust remover trapping normally run by adjacent stove is to the boiler furnace of this startup, improve the ash concentration of this starting trouble burner hearth inside, making this boiler started set up grey balance fast, avoid burner hearth to cause overtemperature coking problem owing to ash concentration is low, boiler can fast lifting load, effectively shorten the start time of boiler, improve the steam production of boiler, reduce the overtemperature coking risk in boiler startup process, it is to increase the security of boiler operatiopn simultaneously.
Claims (8)
1. a circular fluid bed swift start up system, comprise A stove and B stove, it is characterized in that: described A stove is connected with A stove remover ash discharge dust mouth and B stove remover ash discharge dust mouth respectively by A stove ash inlet tube, described B stove is connected with A stove remover ash discharge dust mouth and B stove remover ash discharge dust mouth respectively by B stove ash inlet tube;Described A outlet of still is connected with the import of A stove cyclonic separator, the outlet of described A stove cyclonic separator is connected with A stove back-end ductwork import, the outlet of described A stove back-end ductwork is connected with A stove fly-ash separator import, and the ash discharging hole of described A stove fly-ash separator is connected with A stove by A stove ash inlet tube respectively, is connected with B stove by B stove ash inlet tube, is connected with Hui Ku by ash pipeline; Described B outlet of still is connected with the import of B stove cyclonic separator, the outlet of B stove cyclonic separator is connected with B stove back-end ductwork import, the outlet of B stove back-end ductwork is connected with B stove fly-ash separator import, and the ash discharging hole of B stove fly-ash separator is connected with B stove by B stove ash inlet tube respectively, is connected with A stove by A stove ash inlet tube, is connected with Hui Ku by ash pipeline.
2. a kind of circular fluid bed swift start up system according to claim 1, it is characterized in that: described A stove remover ash discharge dust mouth and the connecting tube of A stove ash inlet tube arrange A stove and returns ash valve, the connecting tube of A stove remover ash discharge dust mouth and ash pipeline arranges A stove and enters ash storehouse valve, the connecting tube of A stove remover ash discharge dust mouth and B stove ash inlet tube arranges A stove and enters B stove and return grey valve.
3. a kind of circular fluid bed swift start up system according to claim 1, it is characterized in that: described B stove remover ash discharge dust mouth and the connecting tube of B stove ash inlet tube arrange B stove and returns ash valve, the connecting tube of B stove remover ash discharge dust mouth and ash pipeline arranges B stove and enters ash storehouse valve, the connecting tube of B stove remover ash discharge dust mouth and A stove ash inlet tube arranges B stove and enters A stove and return grey valve.
4. a kind of circular fluid bed swift start up system according to claim 1 and 2, it is characterized in that: in described A stove, arrange A stove heating surface, A outlet of still is connected with the import of A stove cyclonic separator, the outlet of A stove cyclonic separator is connected with A stove material returning device import, and the outlet of A stove material returning device is connected with A stove import.
5. a kind of circular fluid bed swift start up system according to claim 1 or 3, it is characterized in that: in described B stove, arrange B stove heating surface, B outlet of still is connected with the import of B stove cyclonic separator, the outlet of B stove cyclonic separator is connected with B stove material returning device import, and the outlet of B stove material returning device is connected with B stove import.
6. a kind of circular fluid bed quick start method according to claim 1, it is characterized in that: comprise the following steps: fuel and air are in A stove combustion, products of combustion flue gas carries bed material, coal ash, the particles such as sweetening agent move to A stove top, and to A stove heating surface heat release, flue gas carries particle and leaves A stove afterwards, enter into A stove cyclonic separator, the coarse particles that flue gas carries is trapped by A stove cyclonic separator and returns A stove through A stove material returning device, the fine particle that flue gas carries and flue gas enter A stove back-end ductwork after together leaving A stove cyclonic separator, A stove fly-ash separator is entered after completing heat release, the most fine particles carried in flue gas are collected by A stove fly-ash separator, the fine particle collected is discharged through A stove remover ash discharge dust mouth, fuel and air are in B stove combustion, products of combustion flue gas carries bed material, coal ash, the particles such as sweetening agent move to B stove top, and to B stove heating surface heat release, flue gas carries particle and leaves B stove afterwards, enter into B stove cyclonic separator, the coarse particles that flue gas carries is trapped by B stove cyclonic separator and returns B stove through B stove material returning device, the fine particle that flue gas carries and flue gas enter B stove back-end ductwork after together leaving B stove cyclonic separator, B stove fly-ash separator is entered after completing heat release, the most fine particles carried in flue gas are collected by B stove fly-ash separator, the fine particle collected is discharged through B stove remover ash discharge dust mouth.
7. a kind of circular fluid bed quick start method according to claim 6, it is characterized in that: when B stove normally runs, when starting A stove, start following step: when A stove starts, the coal feeding amount of A stove is few, and the granule density in A stove is low, low to the heat release ability of A stove heating surface at the flue gas of A stove (A1) and the particle that carries thereof, if now throwing in a large amount of coal in A stove, fire box temperature increases fast, it is easy to cause particle overtemperature to cause the faults such as coking; Close A stove and enter ash storehouse valve, open A stove and return ash valve, the fine particle that A stove fly-ash separator is collected is delivered to A stove by A stove ash inlet tube; Cut out B stove enters ash storehouse valve and B stove returns ash valve, and unlatching B stove enters A stove and returns ash valve, and by A stove ash inlet tube, the fine particle of B stove fly-ash separator collection is delivered to A stove; The fine particle collected by the fine particle collected by A stove fly-ash separator and B stove fly-ash separator is delivered to A stove, effectively improves the granule density of A stove, it is to increase flue gas in A stove and particle are to the thermal discharge of A stove heating surface; When the granule density of A stove is enough high, strengthen to the throwing coal speed of A stove, A stove not overtemperature when start A stove fast.
8. a kind of circular fluid bed quick start method according to claim 6, it is characterized in that: when A stove normally runs, when starting B stove, start following step: when B stove starts, the coal feeding amount of B stove is few, and the granule density in B stove is low, low to the heat release ability of B stove heating surface at the flue gas of B stove and the particle that carries thereof, if now throwing in a large amount of coal in B stove, fire box temperature increases fast, it is easy to cause particle overtemperature to cause the faults such as coking; Close B stove and enter ash storehouse valve, open B stove and return ash valve, the fine particle that B stove fly-ash separator is collected is delivered to B stove by B stove ash inlet tube; Cut out A stove enters ash storehouse valve and A stove returns ash valve, and unlatching A stove enters B stove and returns ash valve, and by B stove ash inlet tube, the fine particle of A stove fly-ash separator collection is delivered to B stove; The fine particle collected by the fine particle collected by B stove fly-ash separator and A stove fly-ash separator is delivered to B stove, effectively improves the granule density of B stove, it is to increase flue gas in B stove and particle are to the thermal discharge of B stove heating surface; When the granule density of B stove is enough high, strengthen to the throwing coal speed of B stove, B stove not overtemperature when start B stove fast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510842228.XA CN105674256B (en) | 2015-11-29 | 2015-11-29 | Circulating fluidized bed boiler quick start system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510842228.XA CN105674256B (en) | 2015-11-29 | 2015-11-29 | Circulating fluidized bed boiler quick start system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105674256A true CN105674256A (en) | 2016-06-15 |
| CN105674256B CN105674256B (en) | 2019-09-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106196010A (en) * | 2016-08-29 | 2016-12-07 | 江苏汇能锅炉有限公司 | A kind of fly ash reinjection device of the low ash coal burning boiler that burns |
| CN111895391A (en) * | 2020-07-17 | 2020-11-06 | 东方电气集团东方锅炉股份有限公司 | Operation regulation and control method for preventing hearth from coking after BT (BT) of supercritical circulating fluidized bed boiler |
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| CN105674256B (en) | 2019-09-27 |
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