CN107940448A - A kind of pulverized coal particle recirculating fluidized bed combustion system and its combustion method - Google Patents
A kind of pulverized coal particle recirculating fluidized bed combustion system and its combustion method Download PDFInfo
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- CN107940448A CN107940448A CN201711378215.7A CN201711378215A CN107940448A CN 107940448 A CN107940448 A CN 107940448A CN 201711378215 A CN201711378215 A CN 201711378215A CN 107940448 A CN107940448 A CN 107940448A
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- burner hearth
- air
- pulverized coal
- vertical section
- coal particle
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- 239000002245 particle Substances 0.000 title claims abstract description 44
- 239000003245 coal Substances 0.000 title claims abstract description 41
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 230000003134 recirculating effect Effects 0.000 title claims abstract description 17
- 238000009841 combustion method Methods 0.000 title abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 229910052755 nonmetal Inorganic materials 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000001464 adherent effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 10
- 239000000843 powder Substances 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 230000005587 bubbling Effects 0.000 description 2
- 210000000038 chest Anatomy 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001925 catabolic effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A kind of pulverized coal particle recirculating fluidized bed combustion system of the present invention and its combustion method, belong to clean coal technical field.Including igniter, scum pipe, air-distribution device, burner hearth, coal-feeding tube, refeed line, secondary air channel, cyclone separator, material returning valve, back-end ductwork, superheater, economizer, air preheater and its broken machine device of the column of stokehold；The fine powder of coal-powder boiler is conducive to flow uniform and quick after-flame, the relatively low bed temperature of fluid bed and the circulation of a large amount of material inside and outsides advantageously reduce pollutant emission, the present invention has carried out the optimization of profound level on the basis of two kinds of coal combustion technologies of coal-powder boiler and recirculating fluidized bed are organically combined, and obtains a kind of very-high performance, the combustion technology of minimum discharge.
Description
Technical field
The invention belongs to clean coal technical field, and in particular to a kind of pulverized coal particle recirculating fluidized bed combustion system and its combustion
Firing method.
Background technology
Circulating fluidized bed combustion coal technology is a ripe clean coal burning technology, now comes into large-scale commercialization
Stage.It is increasingly stringent however as environmental protection policy, merely by pollutant catabolic gene measure in circulating fluid bed boiler without
Method meets existing environmental protection standard requirement；Circulating fluidized bed boiler is forced to sacrifice part efficiency spy to take into account environmental protection characteristic at the same time
Property --- such as reduce fire box temperature, reduce excess air coefficient, most directly translate into environment-friendly type circulating fluidized bed boiler flying dust
Phosphorus content and carbon content in the bottom ash are generally higher.Coal-powder boiler has nearly two century-old history runs, is acknowledged as efficiency of combustion highest
A coal combustion technology, however, will its realize preferable environmental protection characteristic, after stove must the supporting SCR denitration system to involve great expense,
Wet desulphurization and wet electric dust removing system etc., coal-powder boiler user can't bear the heavy load.Considered based on factors above, there is an urgent need to one kind
Pulverized coal particle recirculating fluidized bed (PC-CFB) combustion method and system, with meet efficient burning, minimum discharge market needs.
The content of the invention
The goal of the invention of the present invention is in view of the deficiencies of the prior art, there is provided a kind of pulverized coal particle circulating fluidized bed combustion system
System and its combustion method.
To achieve the above object, the technical solution adopted in the present invention is：A kind of pulverized coal particle circulating fluidized bed combustion system
System, wherein：Including igniter, scum pipe, air-distribution device, burner hearth, coal-feeding tube, refeed line, secondary air channel, cyclone separator,
Material returning valve, back-end ductwork, superheater, economizer, air preheater and its broken machine device of the column of stokehold；The igniter is located at cloth wind
The rear end of device, and be suspended in by spring hanger on boiler crossbeam；The upper end of the scum pipe passes through air-distribution device and burner hearth
Connection, lower end is connected with lag cooler；The scum pipe shares 4, and two, outside is continuity scum pipe, and inner side two is selection
Property scum pipe；The burner hearth is located at the top of air-distribution device, and the outlet of burner hearth passes through non-metal expansion joint and cyclone separator
It is connected；The coal-feeding tube is arranged on the downside of the front wall of burner hearth；The refeed line is arranged on the downside of the rear wall of burner hearth；The Secondary Air
Pipe burner hearth front-back wall interlaced arrangement, and the overfiren air port quantity of front wall be more than rear wall quantity；The cyclone separator position
In the centre of burner hearth and back-end ductwork, and the import of cyclone separator is connected by non-metal expansion joint with burner hearth, cyclonic separation
The exhaust outlet of device is connected by non-metal expansion joint with back-end ductwork；Stand the lower part of the suitable for reading and cyclone separator of the material returning valve
Pipe is connected, and the lower mouth of material returning valve is connected by type metal expansion joint with refeed line；The back-end ductwork is located at combustion system
Rear, the superheater and economizer are supported in back-end ductwork successively；The air preheater is connected to economizer by breathing section
Lower section.
Further preferred embodiment, the burner hearth are divided into bottom vertical section region, changeover portion region and Upper vertical section region
(4-3), bottom vertical section region are located at below overfiren air port, are highly 3.8m, the size in bottom vertical section peak width direction
Identical with upper furnace, the size of depth direction is 0.35 times of upper furnace depth, and changeover portion region is overfiren air port top
One section, original 0.35 times is punctured into depth direction from top to bottom, Upper vertical section region is the main space of heat transfer, highly
For 25m, for the particle diameter of reduction recycle stock, the superficial gas velocity in burner hearth bottom vertical section region and Upper vertical section region is chosen
For 4m/s.
Further preferred embodiment, the cyclone separator include import accelerating sections, cylinder, cone, standpipe and exhaust pipe, institute
The aditus laryngis flow velocity for stating accelerating sections and cylinder the tangent is designed as 35m/s, and cylinder is highly 1.5 times of barrel diameter, cone height
For 2 times of barrel diameter, exhaust pipe uses " back taper " structure, and insertion depth is 0.5 times of inlet height.
Further preferred embodiment, the air-distribution device sectional area is the 35% of furnace cross-sectional area, while uses small bell jar wind
Cap, blast cap aperture flow velocity are 40Nm/s, and blast cap resistance is 2300Pa, PC-CFB stoves is also stablized fortune under low load condition
OK.
Further preferred embodiment, the overfiren air port individual layer front-back wall interlaced arrangement, and front wall overfiren air port quantity is more than
Wall afterwards, overfiren air port flow velocity are 80m/s, and the vertical range with air-distribution device is 3.5~4.5m, on the premise of ensureing to burn,
Improve the environmental protection characteristic of PC-CFB stoves.
A kind of method using the pulverized coal particle recirculating fluidized bed combustion system burning pulverized coal particle of the invention, specifically
By the broken machine device of the column of stokehold by the pulverized coal particle that raw coal Particle Breakage is 0~2mm, to account for the First air of total blast volume 35%
Enter the vertical section region of burner hearth bottom by air-distribution device after air preheater preheats, the fine coal of burner hearth bottom is entered by coal-feeding tube
Particle and by refeed line enter burner hearth bottom circulating ash First air bubbling effect under, be largely transported to burner hearth transition
Section region, the Secondary Air for accounting for total blast volume 65% are timely by the secondary air channel positioned at changeover portion region lower end after air preheater preheats
Fill into, Secondary Air is accessible to burner hearth center, avoids oxygen-depleted zone, under a Secondary Air collective effect, material is then routed to stove
Thorax Upper vertical section region, then, recycle stock in particle diameter reflux formation adherent more than the particle of 300um, particle diameter are less than 300um
Thin material enter efficient cyclone separator after, 99.9% material is captured to form outer circulation material, remaining superfine-material with
Flying dust form is carried along into back-end ductwork by flue gas, to avoid fine ash from being deposited in back-end ductwork, tail flue gas velocity ratio conventional pan
The superficial gas velocity in the high 3m/s of stove, burner hearth bottom vertical section region and Upper vertical section region is 4m/s, and pulverized coal particle is at this
Combustion process is completed in the interior circulation and outer circulation of series；It is 8Kpa that burner hearth differential pressure is maintained during operation, and afterbody oxygen amount is 2~3%,
Bed temperature is maintained at 850 DEG C at this time, and the burner hearth differential pressure on overfiren air port is maintained at average 100Pa/m, while efficient burning again
Generation and the efficient removal SO of NOx can preferably be suppressed2；The broken machine device of column is a kind of crusher system.
Compared with existing coal combustion technology, the invention has the advantages that：
1. high combustion efficiency, desulfuration in furnace effect are good, while effectively suppress the generation of NOx, it is less than 2 situation in calcium sulfur ratio
Under, be originally generated amount of the desulfuration in furnace efficiency more than 99%, NOx is less than 50mg/Nm3；
2. ash concentration is big in burner hearth, furnace heat transfer coefficient is high, and tail flue gas flow velocity is high, and afterbody convective heat-transfer coefficient is high, drop
Low heat exchange area, saves steel consumption.
3. material size is thin in stove, fluidising air velocity is low, thoroughly eliminates the wear problem of CFB boiler.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of pulverized coal particle recirculating fluidized bed combustion system of the present invention.
Embodiment
As shown in Figure 1, a kind of pulverized coal particle recirculating fluidized bed combustion system described in the present embodiment, wherein：Filled including igniting
Put 1, scum pipe 2, air-distribution device 3, burner hearth 4, coal-feeding tube 5, refeed line 6, secondary air channel 7, cyclone separator 8, material returning valve 9, tail
Portion's flue 10, superheater 11, economizer 12, air preheater 13 and its broken machine device of the column of stokehold；The igniter 1 is located at cloth wind
The rear end of device 3, and be suspended in by spring hanger on boiler crossbeam；The upper end of the scum pipe 2 passes through air-distribution device 3 and stove
Thorax 4 connects, and lower end is connected with lag cooler；The scum pipe 2 shares 4, and two, outside is continuity scum pipe, and inner side two is
Selective deslagging pipe；The burner hearth 4 is located at the top of air-distribution device 3, and the outlet of burner hearth 4 passes through non-metal expansion joint and whirlwind
Separator 8 is connected；The coal-feeding tube 5 is arranged on the downside of the front wall of burner hearth 4；The refeed line 6 is arranged under the rear wall of burner hearth 4
Side；The secondary air channel 7 burner hearth 4 front-back wall interlaced arrangement, and the overfiren air port quantity of front wall be more than rear wall quantity；Institute
The centre that cyclone separator 8 is located at burner hearth 4 and back-end ductwork 10 is stated, and the import of cyclone separator 8 passes through non-metal expansion joint
It is connected with burner hearth 4, the exhaust outlet of cyclone separator 8 is connected by non-metal expansion joint with back-end ductwork 10；The material returning valve 9
Lower riser suitable for reading with cyclone separator 8 is connected, and the lower mouth of material returning valve 9 is connected by type metal expansion joint with refeed line 6；
The back-end ductwork 10 is located at the rear of combustion system, and the superheater 11 and economizer 12 are supported on back-end ductwork 10 successively
It is interior；The air preheater 13 is connected to the lower section of economizer 12 by breathing section.
Burner hearth 4 described in the present embodiment divides for bottom vertical section region 4-1, changeover portion region 4-2 and Upper vertical section area
Domain 4-3, bottom vertical section region 4-1 are located at overfiren air port below 7, are highly 3.8m, bottom vertical section peak width direction
Size is identical with upper furnace, and the size of depth direction is 0.35 times of upper furnace depth, and changeover portion region 4-2 is Secondary Air
One section of top of mouth, is punctured into original 0.35 times in depth direction from top to bottom, and Upper vertical section region 4-3 is the main of heat transfer
Space, is highly 25m, to reduce the particle diameter of recycle stock, burner hearth bottom vertical section region 4-1 and Upper vertical section region 4-3
Superficial gas velocity be chosen for 4m/s.
Cyclone separator 8 described in the present embodiment include import accelerating sections 8-1, cylinder 8-2, cone 8-3, standpipe 8-4 and
Exhaust pipe 8-5, the accelerating sections 8-1 and the aditus laryngis flow velocity of cylinder 8-2 the tangent are designed as 35m/s, and cylinder 8-2 is highly cylinder
1.5 times of diameter, cone 8-3 are highly 2 times of barrel diameter, and exhaust pipe 8-5 uses " back taper " structure, insertion depth be into
0.5 times of open height.
The sectional area of air-distribution device 3 described in the present embodiment is the 35% of furnace cross-sectional area, while uses small bell jar blast cap, wind
Cap aperture flow velocity is 40Nm/s, and blast cap resistance is 2300Pa, makes PC-CFB stoves also being capable of stable operation under low load condition.
The individual layer front-back wall interlaced arrangement of overfiren air port 7 described in the present embodiment, and front wall overfiren air port quantity is more than rear wall,
Overfiren air port flow velocity is 80m/s, and the vertical range with air-distribution device 3 is 3.5~4.5m, on the premise of ensureing to burn, lifting
The environmental protection characteristics of PC-CFB stoves.
A kind of method using the pulverized coal particle recirculating fluidized bed combustion system burning pulverized coal particle of the present embodiment, specifically
By the broken machine device of the column of stokehold by the pulverized coal particle that raw coal Particle Breakage is 0~2mm, to account for the First air of total blast volume 35%
Enter the vertical section region 4-1 of burner hearth bottom by air-distribution device 3 after the preheating of air preheater 13, burner hearth bottom is entered by coal-feeding tube 5
The pulverized coal particle in portion and the circulating ash of burner hearth bottom is entered under the effect of First air bubbling by refeed line 6, it is most of to be conveyed
To burner hearth changeover portion region 4-2, the Secondary Air of total blast volume 65% is accounted for after the preheating of air preheater 13 by under changeover portion region
The secondary air channel 7 at end fills into time, and Secondary Air is accessible to burner hearth center, avoids oxygen-depleted zone, under a Secondary Air collective effect,
Material is then routed to upper furnace vertical section region 4-3, then, is followed in particle diameter reflux formation adherent more than the particle of 300um
Ring material, after thin material of the particle diameter less than 300um enters efficient cyclone separator 8,99.9% material is captured to form outer follow
Ring material, remaining superfine-material are carried along into back-end ductwork 10 in the form of flying dust by flue gas, to avoid fine ash in back-end ductwork 10
The apparent gas in deposition, the high 3m/s of tail flue gas velocity ratio conventional boiler, burner hearth bottom vertical section region and Upper vertical section region
Speed is 4m/s, and pulverized coal particle completes combustion process in this series of interior circulation and outer circulation；Maintain burner hearth poor during operation
It is 2~3% to press as 8Kpa, afterbody oxygen amount, and bed temperature is maintained at 850 DEG C at this time, and the burner hearth differential pressure on overfiren air port is maintained at flat
Equal 100Pa/m, efficient burning while, can preferably suppress generation and the efficient removal SO of NOx again2；The broken machine device of column is one
Kind crusher system.
The material returning valve 9 is self-balancing material-returning device, and the air compartment of material returning valve lower part realizes " subregion cloth wind, individually adjusted ",
Blanking crosswind amount is less than normal, and feed back crosswind amount is bigger than normal；
The back-end ductwork 10 easily has ultra-fine grey adhesion deposition, it is necessary to improve tail flue gas flow velocity, tail flue gas stream
Speed is chosen higher 3m/s than CFB boiler；
The present invention provides a kind of energy saving clean coal burning technology to get both with emission reduction, the fine powder of coal-powder boiler is set to be conducive to flow
Dynamic uniform and quick after-flame, the relatively low bed temperature of fluid bed and the circulation of a large amount of material inside and outsides advantageously reduce pollutant emission, this
Invention has carried out the optimization of profound level on the basis of two kinds of coal combustion technologies of coal-powder boiler and recirculating fluidized bed are organically combined, and obtains
A kind of very-high performance, the combustion technology of minimum discharge.
Claims (6)
1. a kind of pulverized coal particle recirculating fluidized bed combustion system, it is characterized in that：Including igniter (1), scum pipe (2), cloth wind
Device (3), burner hearth (4), coal-feeding tube (5), refeed line (6), secondary air channel (7), cyclone separator (8), material returning valve (9), afterbody
Flue (10), superheater (11), economizer (12), the broken machine device of the column of air preheater (13) and its stokehold；The igniter (1)
It is suspended in positioned at the rear end of air-distribution device (3), and by spring hanger on boiler crossbeam；The upper end of the scum pipe (2) passes through
Air-distribution device (3) is connected with burner hearth (4), and lower end is connected with lag cooler；The scum pipe (2) shares 4, and two, outside is continuous
Property scum pipe, inner side two is selective deslagging pipe；The burner hearth (4) is located at the top of air-distribution device (3), and burner hearth (4)
Outlet is connected by non-metal expansion joint with cyclone separator (8)；The coal-feeding tube (5) is arranged on the downside of the front wall of burner hearth (4)；
The refeed line (6) is arranged on the downside of the rear wall of burner hearth (4)；The secondary air channel (7) is interlocked cloth in the front-back wall of burner hearth (4)
Put, and the overfiren air port quantity of front wall is more than the quantity of rear wall；The cyclone separator (8) is located at burner hearth (4) and back-end ductwork
(10) centre, and the import of cyclone separator (8) is connected by non-metal expansion joint with burner hearth (4), cyclone separator (8)
Exhaust outlet is connected by non-metal expansion joint with back-end ductwork (10)；The suitable for reading and cyclone separator (8) of the material returning valve (9)
Lower riser is connected, and the lower mouth of material returning valve (9) is connected by type metal expansion joint with refeed line (6)；The back-end ductwork
(10) it is located at the rear of combustion system, the superheater (11) and economizer (12) are supported in back-end ductwork (10) successively；Institute
State the lower section that air preheater (13) is connected to economizer (12) by breathing section.
2. a kind of pulverized coal particle recirculating fluidized bed combustion system according to claim 1, it is characterized in that：The burner hearth (4)
It is divided into bottom vertical section region (4-1), changeover portion region (4-2) and Upper vertical section region (4-3), bottom vertical section region
(4-1) is located at overfiren air port (7) below, is highly 3.8m, size and the upper furnace phase in bottom vertical section peak width direction
Together, the size of depth direction is 0.35 times of upper furnace depth, and changeover portion region (4-2) is one section of overfiren air port top, from
On be down punctured into original 0.35 times in depth direction, Upper vertical section region (4-3) is the main space of heat transfer, is highly
25m, to reduce the apparent gas of the particle diameter of recycle stock, burner hearth bottom vertical section region (4-1) and Upper vertical section region (4-3)
Speed is chosen for 4m/s.
3. a kind of pulverized coal particle recirculating fluidized bed combustion system according to claim 1, it is characterized in that：The cyclonic separation
Device (8) includes import accelerating sections (8-1), cylinder (8-2), cone (8-3), standpipe (8-4) and exhaust pipe (8-5), the acceleration
The aditus laryngis flow velocity of section (8-1) and cylinder (8-2) the tangent is designed as 35m/s, and cylinder (8-2) is highly 1.5 times of barrel diameter,
Cone (8-3) is highly 2 times of barrel diameter, and exhaust pipe (8-5) uses " back taper " structure, and insertion depth is inlet height
0.5 times.
4. a kind of pulverized coal particle recirculating fluidized bed combustion system according to claim 1, it is characterized in that：The air-distribution device
(3) sectional area is the 35% of furnace cross-sectional area, while uses small bell jar blast cap, and blast cap aperture flow velocity is 40Nm/s, blast cap resistance
For 2300Pa, make PC-CFB stoves also being capable of stable operation under low load condition.
5. a kind of pulverized coal particle recirculating fluidized bed combustion system according to claim 1, it is characterized in that：The overfiren air port
(7) individual layer front-back wall interlaced arrangement, and front wall overfiren air port quantity is more than rear wall, overfiren air port flow velocity is 80m/s, is filled with cloth wind
The vertical range for putting (3) is 3.5~4.5m.
It is 6. a kind of using any one of claim 1 to the 5 pulverized coal particle recirculating fluidized bed combustion system burning pulverized coal particle
Method, it is characterized in that：Pulverized coal particle by the broken machine device of the column of stokehold by raw coal Particle Breakage for 0~2mm, accounts for total blast volume
35% First air is entered the vertical section region (4-1) of burner hearth bottom after air preheater (13) preheating by air-distribution device (3), is passed through
Coal-feeding tube (5) enters the pulverized coal particle of burner hearth bottom and enters the circulating ash of burner hearth bottom in First air drum by refeed line (6)
Under bubble effect, burner hearth changeover portion region (4-2) is largely transported to, the Secondary Air for accounting for total blast volume 65% is pre- through air preheater (13)
Filled into time by the secondary air channel (7) positioned at changeover portion region lower end after heat, Secondary Air is accessible to burner hearth center, avoids poor
Oxygen area, under a Secondary Air collective effect, material is then routed to upper furnace vertical section region (4-3), and then, particle diameter is more than
Recycle stock in the adherent reflux formation of particle of 300um, thin material of the particle diameter less than 300um enter efficient cyclone separator (8)
Afterwards, 99.9% material is captured to form outer circulation material, remaining superfine-material is carried along into afterbody in the form of flying dust by flue gas
Flue (10), to avoid fine ash from being deposited in back-end ductwork (10), the high 3m/s of tail flue gas velocity ratio conventional boiler, burner hearth bottom erects
The superficial gas velocity in straight section region and Upper vertical section region is 4m/s, and pulverized coal particle is in this series of interior circulation and outer circulation
Middle completion combustion process；It is 8Kpa that burner hearth differential pressure is maintained during operation, and afterbody oxygen amount is 2~3%, and bed temperature is maintained at 850 DEG C at this time,
Burner hearth differential pressure on overfiren air port is maintained at average 100Pa/m, efficient burning while can preferably suppress again NOx generation and
Efficient removal SO2；The broken machine device of column is a kind of crusher system.
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| CN116481021A (en) * | 2023-05-17 | 2023-07-25 | 哈尔滨红光锅炉总厂有限责任公司 | Environment-friendly energy-saving circulating fluidized bed boiler capable of respectively burning coal and coal water slurry |
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| CN116481021A (en) * | 2023-05-17 | 2023-07-25 | 哈尔滨红光锅炉总厂有限责任公司 | Environment-friendly energy-saving circulating fluidized bed boiler capable of respectively burning coal and coal water slurry |
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