CN106439889A - Anthracite large oxygen-enriched combustion system and method with novel direct blowing powder production device - Google Patents
Anthracite large oxygen-enriched combustion system and method with novel direct blowing powder production device Download PDFInfo
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- CN106439889A CN106439889A CN201611072344.9A CN201611072344A CN106439889A CN 106439889 A CN106439889 A CN 106439889A CN 201611072344 A CN201611072344 A CN 201611072344A CN 106439889 A CN106439889 A CN 106439889A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- 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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- 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
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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- 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
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides an anthracite large oxygen-enriched combustion system and a method with a novel direct blowing powder production device for realizing an anthracite high-volume (600 MW and above) tangential firing mode or a wall firing mode. When the direct blowing powder production system is adopted, the wind powder temperature of primary wind is low; and the system optimizes the wind powder airflow of the primary wind, and improves the ignition characteristic. The firing mode realizes CO2 emission reduction, radically reduces emission of nitric oxides, and meanwhile, increases the burn-off rate of coal powder.
Description
Technical field
The present invention relates to a kind of carry the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite and method, belong to and send out
Electric equipment field.
Background technology
The explored coal reserves of China is about 640,000,000,000 tons, and wherein low volatile anthracite accounts for coal reserves
14.6%.Anthracite be bury the age at most, carbonizing degree is the deepest, volatile matters are a minimum coal.Typical anthracite tool
Have that phosphorus content is high, caloric value is high, ash fusion point is high and low volatile, low ash and low sulfur content, that is, so-called " three-hypers and three low " are special
Point.Its surface has bright black glossy, and its dry ash free basis volatile matters are below 10%, and fixing carbon content and calorific value
Of a relatively high.Anthracite is mainly used as the fuel of power station and Industrial Boiler at present, is that key industry fuel and the power of China is used
One of coal.Data is had to show, anthracite and meager coal account for 1/5th of China's steam coal, and anthracitic efficient utilization exists
Very important status is occupied in the power-saving technology in China's energy and power engireering field.
In order that the anthracite of low volatile, meager coal stably catch fire and burn, need to keep high temperature in ignition zone, accelerate
Catch fire, and have sufficiently long fire stroke, with sharp after-flame, based on this, occur in that W flame boiler.Substantial amounts of operational performance shows W
Type boiler generally existing breeze airflow catches fire, and late, symmetrical degree of burning is poor, combustion stability is poor, slagging scorification is serious and NOxRow
The problems such as put superelevation.For the problem overcoming the anthracite difficulty of catching fire occurring during using, surely firing tasty after-flame hardly possible, W flame
Boiler has laid a large amount of wall with refractory lining, refracto in lower hearth four peripheral wall surfaces, in order to maintain the higher temperature levels of lower hearth, coal dust in addition
Grain is longer in the lower hearth time of staying of high temperature, leads to the NO of W flame boilerxDischarge capacity is higher very than Terms of Corner Tangential Combustion
Many, most W flame boilers are in NOxDischarge capacity is in 1100mg/m3(folding 6%O2) more than.Cold conditions is single-phase/gas-particle two-phase modelling
Test finds flow field skewness easily in W boiler, shows as the descending flow penetration depth in forward and backward wall side and differs greatly,
Lower hearth always occupied with the air current flow of side leading and serious during the significant lower load of flow field extent of deviation during high load capacity,
Flow field deflection is to lead to asymmetric basic reason of burning.Conventional tangential firing dry bottom furnace passes through combustion technology and powder system processed
The improvement of system, also achieves progress in terms of burning low-volatite coal.This combustion system will be tangential to First air coal dust and secondary wind
Spray into burner hearth, one big fireball of corner flame formation, rotation in stove rises, and has a flame later stage and mixes, pulverized coal particle
Long in residing time in furnace, high combustion efficiency, combustion stability is strong, prevents slagging properties good, and water-cooling wall reliability is high, NOxRow
High-volume low, the features such as to the strong adaptability of fuel change.The achievement of a large amount of 50～300MW anthracite-fired boilers successfully having put into operation
Have been proven that tangential firing mode has good steady combustion and burnout characteristic, not only can match in excellence or beauty with W flame combustion technology, one
Determine also to have more advantage in degree, and had successful using experience.
The CO of coal-burning power plant2In emission-reduction technology, oxygen-enriched combustion technology is current well-established by public affairs, is expected to often replace
Rule coal dust firing generation technology.By increasing air-separating plant before boiler, produce pure oxygen (concentration>95%) replacing air
As oxidant, adjust the heat-transfer character helping in fuel gas temperature and stove using flue gas recirculation simultaneously.Make in tail flue gas
CO2Concentration reaches more than 90%, then passes through CO2Compression purification technique obtains pure CO2, thus controlling CO2Discharge, simultaneously
NO can be madex、SOx, the cooperation-removal of the multiple pollutant such as particulate matter.
The efficiency of China's fired power generating unit is relatively low always, in recent years pass through develop supercritical unit, extra-supercritical unit, " on
Big pressure is little " etc. measure, the average thermal efficiency is obviously improved, the heat-economy in thermal power plant with steam parameter raising and
Rise, improving generatine set heat efficiency is one of target of fired power generating unit development.To the end of the year 2012, extra-supercritical unit installed capacity reaches
91500000 kW, national net coal consumption rate is 318g/ (kWh), reaches world-class levels, and the net coal consumption rate of supercritical unit can drop
To 280g/ (kWh) below.Using anthracite W flame boiler maximum capacity at present both at home and abroad is 660MW grade, but W flame boiler
The above-mentioned combustion problem of generally existing, and W flame boiler structure is more complicated, the design and installation of chimney arch is difficult, burner
Wind powder pipe road difficult arrangement, overall volume is big, and firm consumption is big, and manufacturing effort is big, and the cycle is long, and cost is high, and debugging is complicated, and
And, when W flame boiler develops into 1000MW grade, there is the technical problem that chamber design, burner arrangement etc. are difficult to overcome, and
And manufacturing cost is very high, runs and maintenance is complicated.Corner tangential firing anthracite maximum capacity is 320MW grade at present, and shows
Have the advantages that tangential firing mode and experience are that Future Development Large Copacity is laid using DC burner burning anthracite-fired boiler
Good basis, now mainly needs to overcome problems with：(1) when when adopting unit pulverized-coal system, First air wind powder temperature is low
Improve breeze airflow ignition heat；(2), after high capacity, the superiors' burner is big with orlop burner spacing, burner region
Domain wall thermic load is relatively low.
This patent has the advantage that with reference to oxygen-enriched combusting, tangential firing or wall firing mode, releases combustion anthracite great Rong
Amount (600MW grade and more than) oxygen-enriched combustion system it is considered to after a flue gas recycled waste heat with higher temperature (flue gas low
Oxygen and inertia) enter pulverized coal preparation system, air-coal separating, the deep or light subregion of burner hearth inner tissue are carried out to coal pulverizer outlet breeze airflow simultaneously
Burning in domain, assists burnout degree, adjusts secondary air temperature and fire box temperature by secondary flue gas recycled, to realizing CO2Reduce discharging
Meanwhile, anthracite ignition and burnout characteristic, NO when high degree reduces anthracite combustion are improvedxDischarge.
Content of the invention
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite and side
Method, realizes combustion anthracite Large Copacity (600MW and ratings above) tangential firing mode or wall firing mode.Using direct-firing system
There is First air wind powder temperature low during powder system, this system optimization First air wind powder air-flow, improve its fire behaviour.This combustion
Burning mode achieves CO2Reduce discharging, fundamentally reduce the discharge of nitrogen oxides, improve coal dust burn-off rate simultaneously.
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite, bag
Include：Boiler furnace (1), oxygen blower fan (3), oxygen preheater (5), oxygen bellows (8), flue gas condenser (7), a recirculation
Flue gas blower fan (4), a flue gas recycled preheater (6), secondary flue gas recycled blower fan (2), secondary air box (9), feeder
(11), coal dust down-comer (12), double-inlet and double-outlet steel ball coal mill (10), coal dust classifier (13), coal powder light-dark separation device
(14), thick coal culm gas stream burning device (15), thin powdered coal gas stream burning device (16), burnout degree nozzle (17)；
The stockhole of described boiler furnace (1) is provided with described oxygen preheater (5) and a described flue gas recycled is pre-
Hot device (6)；
Described thick coal culm gas stream burning device (15), described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17)
It is arranged on the hearth wall of described boiler furnace (1)；
Described thick coal culm gas stream burning device (15), described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17)
It is connected with described oxygen bellows (8)；
Described double-inlet and double-outlet steel ball coal mill (10) and described coal dust down-comer (12), described coal dust classifier (13), institute
State coal powder light-dark separation device (14) to connect；
Described coal powder light-dark separation device (14) and described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17)
Connect.
Preferably, described thick coal culm gas stream burning device (15) is connected with described secondary air box (9).
Preferably, described coal dust down-comer (12) is connected with described feeder (11).
Preferably, described oxygen preheater (5) is connected with described oxygen blower fan (3).
Preferably, a described flue gas recycled preheater (6) is connected with a described flue gas recycled blower fan (4).
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combusting method of new direct-firing fuel pulverizing plant anthracite, bag
Include：
Cigarette is entered through once flue gas recycled blower fan (4) after one time flue gas recycled is dried through flue gas condenser (7) eliminating water
Air preheater (6), the flue gas after preheating enters new unit pulverized-coal system as pulverized coal drying agent, extracts partly cold one simultaneously
, as temperature regulato, partly cold dry flue gas is as sealing air for secondary flue gas recycled；
Coal pulverizer outlet breeze airflow carries out air-coal separating through venetian blind type light-dark separation device；
Extract secondary flue gas recycled from economizer exit, enter secondary air box after secondary flue gas recycled blower fan (2)
(9)；
Enter oxygen preheater (5) from the pure oxygen that air separation unit obtains after oxygen blower fan (3), the oxygen after preheating enters
Oxygen bellows (8), are extracted partial oxidation from oxygen bellows and are mixed in secondary air box (9) with hot secondary flue gas recycled, mixing
Gas enters boiler furnace (1) as secondary wind；
Extract heat smoke from economizer exit, i.e. hot secondary flue gas recycled, with part high temperature pure oxygen in secondary air box
Mixing, mixed gas enter boiler furnace as secondary wind.
Preferably, coal pulverizer outlet breeze airflow carries out air-coal separating through venetian blind type light-dark separation device and specifically includes：
Breeze airflow flows through passage vanes formula dense-and-weak separator (14) after coal dust classifier (13) and carries out air-coal separating.
Preferably, also include：
The 3rd area burning of boiler furnace tissue, thick coal culm air-flow passes through thick coal culm gas stream burning after mixing with part high temperature pure oxygen
Device (15) enters lower furnace portion, forms sub- Stoichiometric combustion area, and in this region, coal dust experience is caught fire, burns and gasified；
Thin powdered coal air-flow enters upper furnace, shape by thin powdered coal gas stream burning device (16) after mixing with part high temperature pure oxygen
Cheng Weiya chemical equivalent area, after all coal dusts in this region experience gas-solid reaction, the unburned composition of gas phase of formation, such as CO, enter
Burning-out zone, extracts part pure oxygen from oxygen bellows (8) and enters boiler furnace (1) from burnout degree nozzle (17).
Preferably, thick coal culm gas stream burning device (15) and thin powdered coal gas stream burning device (16) are turbulent burner or direct current
Burner.
Preferably, a flue gas recycled is as pulverized coal drying agent.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite and side
Method, wherein, carries the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite, including：Boiler furnace (1), oxygen blower fan
(3), oxygen preheater (5), oxygen bellows (8), flue gas condenser (7), a flue gas recycled blower fan (4), a recirculation
Smoke-gas preheater (6), secondary flue gas recycled blower fan (2), secondary air box (9), feeder (11), coal dust down-comer (12), double
Enter double go out low speed coal mill (10), coal dust classifier (13), coal powder light-dark separation device (14), thick coal culm gas stream burning device
(15), thin powdered coal gas stream burning device (16), burnout degree nozzle (17)；The stockhole of boiler furnace (1) is provided with oxygen preheater
(5) and flue gas recycled preheater (6)；Thick coal culm gas stream burning device (15), thin powdered coal gas stream burning device (16), burnout degree
Nozzle (17) is arranged on the hearth wall of boiler furnace (1)；Thick coal culm gas stream burning device (15), thin powdered coal gas stream burning device (16),
Burnout degree nozzle (17) is connected with oxygen bellows (8)；Double-inlet and double-outlet steel ball coal mill (10) and coal dust down-comer (12), coal dust divides
From device (13), coal powder light-dark separation device (14) connects；Coal powder light-dark separation device (14) and thin powdered coal gas stream burning device (16),
Burnout degree nozzle (17) connects.In the present embodiment, realize combustion anthracite Large Copacity (600MW and ratings above) tangential firing mode
Or wall firing mode.There is First air wind powder temperature low, this system optimization First air wind during using unit pulverized-coal system
Powder air-flow, improves its fire behaviour.This combustion system achieves CO2Reduce discharging, fundamentally reduce the discharge of nitrogen oxides,
Improve coal dust burn-off rate simultaneously.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the large-scale oxygen-enriched combusting side of the new direct-firing fuel pulverizing plant anthracite of one kind band providing in the embodiment of the present invention
One example structure schematic diagram of method；
Illustrate：1 is boiler furnace, and 2 is secondary flue gas recycled blower fan, and 3 is oxygen blower fan, and 4 is a recirculation
Flue gas blower fan, 5 is oxygen preheater, and 6 is a flue gas recycled preheater, and 7 is flue gas condenser, and 8 is oxygen bellows, and 9 are
Secondary air box, 10 is double-inlet and double-outlet steel ball coal mill, and 11 is feeder, and 12 is coal dust down-comer, and 13 is coal dust classifier, and 14 are
Fine coal ring shaped separator, 15 is thick coal culm gas stream burning device, and 16 is thin powdered coal gas stream burning device, and 17 is burnout degree nozzle.
Specific embodiment
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite and side
Method, realizes combustion anthracite Large Copacity (600MW and ratings above) tangential firing mode or wall firing mode.Using direct-firing system
There is First air wind powder temperature low during powder system, this system optimization First air wind powder air-flow, improve its fire behaviour.This combustion
Burning mode achieves CO2Reduce discharging, fundamentally reduce the discharge of nitrogen oxides, improve coal dust burn-off rate simultaneously.
For enabling the goal of the invention of the present invention, feature, advantage more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of not making creative work, broadly falls into present invention protection
Scope.
Refer to Fig. 1, the new direct-firing fuel pulverizing plant anthracite of one kind band providing in the embodiment of the present invention is large-scale oxygen-enriched
One embodiment of combustion system includes：
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite, bag
Include：Boiler furnace (1), oxygen blower fan (3), oxygen preheater (5), oxygen bellows (8), flue gas condenser (7), a recirculation
Flue gas blower fan (4), a flue gas recycled preheater (6), secondary flue gas recycled blower fan (2), secondary air box (9), feeder
(11), coal dust down-comer (12), double-inlet and double-outlet steel ball coal mill (10), coal dust classifier (13), coal powder light-dark separation device
(14), thick coal culm gas stream burning device (15), thin powdered coal gas stream burning device (16), burnout degree nozzle (17)；
The stockhole of described boiler furnace (1) is provided with described oxygen preheater (5) and a described flue gas recycled is pre-
Hot device (6)；
Described thick coal culm gas stream burning device (15), described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17)
It is arranged on the hearth wall of described boiler furnace (1)；
Described thick coal culm gas stream burning device (15), described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17)
It is connected with described oxygen bellows (8)；
Described double-inlet and double-outlet steel ball coal mill (10) and described coal dust down-comer (12), described coal dust classifier (13), institute
State coal powder light-dark separation device (14) to connect；
Described coal powder light-dark separation device (14) and described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17)
Connect.
Preferably, described thick coal culm gas stream burning device (15) is connected with described secondary air box (9).
Preferably, described coal dust down-comer (12) is connected with described feeder (11).
Preferably, described oxygen preheater (5) is connected with described oxygen blower fan (3).
Preferably, a described flue gas recycled preheater (6) is connected with a described flue gas recycled blower fan (4).
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combusting method of new direct-firing fuel pulverizing plant anthracite, bag
Include：
Cigarette is entered through once flue gas recycled blower fan (4) after one time flue gas recycled is dried through flue gas condenser (7) eliminating water
Air preheater (6), the flue gas after preheating enters new unit pulverized-coal system as pulverized coal drying agent, extracts partly cold one simultaneously
, as temperature regulato, partly cold dry flue gas is as sealing air for secondary flue gas recycled；
Coal pulverizer outlet breeze airflow carries out air-coal separating through venetian blind type light-dark separation device；
Extract secondary flue gas recycled from economizer exit, enter secondary air box after secondary flue gas recycled blower fan (2)
(9)；
Enter oxygen preheater (5) from the pure oxygen that air separation unit obtains after oxygen blower fan (3), the oxygen after preheating enters
Oxygen bellows (8), are extracted partial oxidation from oxygen bellows and are mixed in secondary air box (9) with hot secondary flue gas recycled, mixing
Gas enters boiler furnace (1) as secondary wind；
Extract heat smoke from economizer exit, i.e. hot secondary flue gas recycled, with part high temperature pure oxygen in secondary air box
Mixing, mixed gas enter boiler furnace as secondary wind.
Preferably, coal pulverizer outlet breeze airflow carries out air-coal separating through venetian blind type light-dark separation device and specifically includes：
Breeze airflow flows through passage vanes formula dense-and-weak separator (14) after coal dust classifier (13) and carries out air-coal separating.
Preferably, also include：
The 3rd area burning of boiler furnace tissue, thick coal culm air-flow passes through thick coal culm gas stream burning after mixing with part high temperature pure oxygen
Device (15) enters lower furnace portion, forms sub- Stoichiometric combustion area, and in this region, coal dust experience is caught fire, burns and gasified；
Thin powdered coal air-flow enters upper furnace, shape by thin powdered coal gas stream burning device (16) after mixing with part high temperature pure oxygen
Cheng Weiya chemical equivalent area, after all coal dusts in this region experience gas-solid reaction, the unburned composition of gas phase of formation, such as CO, enter
Burning-out zone, extracts part pure oxygen from oxygen bellows (8) and enters boiler furnace (1) from burnout degree nozzle (17).
Preferably, thick coal culm gas stream burning device (15) and thin powdered coal gas stream burning device (16) are turbulent burner or direct current
Burner.
Preferably, a flue gas recycled is as pulverized coal drying agent.
It is described in detail with a concrete application scene below, application examples includes：
Step is：Dry flue gas after (1) flue gas recycled dehydration, as desiccant, is drawn from a recirculation blower
Two road high-pressure blasts, as sealing air, another road cold wind is used for adjusting coal pulverizer inlet flue-gas temperature on a road.After space division system
To high-concentration oxygen be not involved in powder feeding, and mix with wind in stokehold；(2) this large-scale combustion system is equipped with blowing powder producing system
System, coal pulverizer outlet breeze airflow carries out air-coal separating through light-dark separation device, forms two strands of single breeze airflows, i.e. dense coal
Powder air-flow and thin powdered coal air-flow, two strands of air-flows introduce from the zones of different of boiler furnace；(3) the deep or light subregion of boiler furnace inner tissue
Burn in domain, corresponding for thick coal culm combustion zone with thin powdered coal combustion zone, arrange separate type above thin powdered coal combustion zone
Burnout degree, the primary zone in stove maintains a large amount of burning condition of sub- chemistry, realizes the abundant conversion to gas phase for the coal tar.
Wherein (1) flue gas recycled of step is mixed into coal pulverizer with cold dry flue gas after the preheating of gas air preheater,
It is very different with conventional pulverized-coal boiler milling system dried medium, the main component of dry flue gas is CO2, and dry flue gas oxygen is dense
Degree is very low, and CO2 has reactionlessness, can improve pulverizer outlet temperature, without bringing safety issue.Space division simultaneously
The high-concentration oxygen obtaining is heated through oxygen preheater, and high-temperature oxygen is mixed with primary wind and powder in stokehold, on the one hand improves
First air oxygen concentration, on the one hand can improve primary wind and powder temperature, play the effect of pulverized coal carried by hot air.
Wherein step (2) coal pulverizer outlet breeze airflow carries out air-coal separating through light-dark separation device, can adopt BAIYE
Window light-dark separation device or cyclonic separation cartridge type light-dark separation device, it is little that shutter light-dark separation device has separation resistance
Advantage, cyclonic separation cartridge type light-dark separation device separation efficiency is high, and operating experience is enriched, in actual design process, permissible
Select one of which segregation apparatuss as needed.
Wherein step (3) boiler furnace inner tissue bias pulverized coal subregion burning.Thick coal culm air-flow burns below burner hearth
Device introduces, and forms thick coal culm combustion zone, and this region oxygen amount is low, away from stoichiometric ratio, is conducive to catching fire of coal dust, simultaneously low
Under oxygen atmosphere, coal tar and CO2 and H2O are fully gasified；Thin powdered coal air-flow introduces in the middle part of burner hearth, is controlled by after-flame air quantity
Thin powdered coal combustion zone processed is in critical stoichiometric ratio atmosphere, and the coal tar of realization fully burns and gasifies, and realizes coal tar in combustion
Wind is gasified totally before introducing to the greatest extent.Arrange separate type pure oxygen burnout degree above burner hearth, realize the unburned composition in primary zone (predominantly
CO burning).Wherein burner both can also adopt DC burner using turbulent burner.During using turbulent burner
Using strong eddy flow inner second air, secondary air temperature can be properly increased, volume inhales high-temperature flue gas, and strengthening backflow flue gas are to breeze airflow
Preheating and the dilution to oxidant, thin powdered coal gas stream burning device can be concentrated using pulverized coal concentrator, improves fire behaviour.Adopt
With on the one hand injection being carried out using the surrounding air with high-speed jet to breeze airflow during DC burner, strengthen and penetrate depth
Degree, the opposing party's roll is inhaled high-temperature flue gas and breeze airflow is preheated and oxidant is diluted.
Dry flue gas after (1) flue gas recycled dehydration, is mixed with partly cold dry flue gas after the heating of gas air preheater
Afterwards as pulverized coal drying agent, extract simultaneously partly cold dry flue gas as sealing air.Due to dry flue gas and anthracitic special nature,
Pulverizer outlet temperature can be improved, 150 DEG C about can be brought up to.
(2) coal pulverizer outlet breeze airflow carries out air-coal separating through venetian blind type light-dark separation device.Every coal pulverizer
Outlet four pulverized coal channels (each outlet of coarse powder separating device directly picks out 2 pulverized coal channels) of setting, every pulverized coal channel passes through
After one dense-and-weak separator, respectively with the same angle of burner hearth on a dense First air/thick coal culm nozzle and First air/
Thin powdered coal nozzle is corresponding to be connected.After four dense-and-weak separators are processed, obtain each four road breeze airflows of two deep or light differences.
(3) high-concentration oxygen that space division obtains is heated through oxygen preheater, and high-temperature oxygen is in stokehold and First air wind
Powder air-flow carries out high efficient mixed, on the one hand improves First air oxygen concentration (than oxygen-enriched boiler First air oxygen during usual burning smoke coal
Concentration design load 18% is high), on the other hand can improve primary wind and powder temperature, after such as mixing, reach 200 DEG C about.
(4) boiler furnace inner tissue deep or light subregion burning, thick coal culm air-flow burn introducing below burner hearth, the dense coal of formation
Powder burns, and thin powdered coal air-flow introduces in the middle part of burner hearth, controls thin powdered coal combustion zone to be in critical chemistry by after-flame air quantity
Equivalent proportion atmosphere, realizes coal tar and fully burns and gasify.Arrange separate type pure oxygen burnout degree above burner hearth, realize primary zone not
The after-flame of combustion composition (predominantly CO).Burner adopts DC burner, Terms of Corner Tangential Combustion.Coal nozzle surrounding is arranged
Surrounding air nozzle, using the surrounding air with high-speed jet, on the one hand carries out injection, increases penetration depth, separately to breeze airflow
On the one hand volume is inhaled high-temperature flue gas and breeze airflow is preheated and oxidant is diluted.
(5) extract heat smoke from economizer exit, i.e. hot secondary flue gas recycled, with part high temperature pure oxygen in secondary air box
Interior mixing, mixed gas enter boiler furnace as secondary wind.In real process, secondary flue gas recycled can be properly increased
Temperature, be conducive to the steady combustion of breeze airflow, furnace heat transfer characteristic can be improved simultaneously.
Advantages of the present invention：
Oxygen-enriched combusting mode with burning anthracite pulverized-coal fired boiler, is overcome traditional combustion anthracite coal by this combustion system
High NOx emission and the defect of low burn-off rate that powder boiler exists, while realizing CO2 and reduce discharging, cooperation-removal NOx, SOx,
The pollutant such as grain thing.
This combustion system achieves and for unit pulverized-coal system to apply to Large Copacity tangential firing or wall firing anthracite
Pulverized-coal fired boiler, boiler capacity can reach 600MW and ratings above.
This combustion system is optimized to unit pulverized-coal system, exports configuration coal powder light-dark in coal dust classifier and separates
Device, realizes coal powder light-dark and separates, the zones of different tissue burning in burner hearth of bias pulverized coal air-flow, greatly reduces thick coal culm gas
Stream ignition heat.
The deep or light subregion burning of burner hearth inner tissue, thick coal culm air-flow introduces in lower furnace portion, forms a low chemical equivalent
Ratio combustion zone, is conducive to catching fire of breeze airflow, simultaneously because the presence of high concentration CO 2 and vapor, coal tar can be low
Sufficiently gasified under oxygen atmosphere, the release for coke nitrogen and the after-flame of coal dust are all very favorable；Thin powdered coal air-flow
By burner, coal dust can be concentrated, bias combustion realized by the special construction by burner, improve thin powdered coal air-flow
Fire behaviour；Take a small amount of pure oxygen burnout degree simultaneously, control thin powdered coal combustion zone to be in sub- Stoichiometric combustion as far as possible
Atmosphere, and pure oxygen will not bring the NOx in flue gas, highly beneficial for the discharge controlling NOx.
As pulverized coal drying agent, desiccant has inertia to flue gas recycled in itself, and anthracite belongs to and is difficult fire coal
Kind, the temperature that can adjust entrance coal pulverizer desiccant is in a higher level, is on the one hand conducive to the drying of coal dust, separately
On the one hand the temperature of primary wind and powder air-flow can be improved.Primary wind and powder air-flow is carried out reasonably with high temperature pure oxygen before entering burner hearth
Mixing, improves First air oxygen concentration and temperature, improves the fire behaviour of breeze airflow.
Secondary flue gas recycled extracts it is not necessary to through the heating of gas air preheater, simplify the preheating of gas gas after economizer
The structure of device, three points of storehouse gas air preheaters can meet condition.
One kind provided in an embodiment of the present invention carries the large-scale oxygen-enriched combusting method of new direct-firing fuel pulverizing plant anthracite and dress
Put, wherein, carry the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite, including：Boiler furnace (1), oxygen blower fan
(3), oxygen preheater (5), oxygen bellows (8), flue gas condenser (7), a flue gas recycled blower fan (4), a recirculation
Smoke-gas preheater (6), secondary flue gas recycled blower fan (2), secondary air box (9), feeder (11), coal dust down-comer (12), double
Enter double go out low speed coal mill (10), coal dust classifier (13), coal powder light-dark separation device (14), thick coal culm gas stream burning device
(15), thin powdered coal gas stream burning device (16), burnout degree nozzle (17)；The stockhole of boiler furnace (1) is provided with oxygen preheater
(5) and flue gas recycled preheater (6)；Thick coal culm gas stream burning device (15), thin powdered coal gas stream burning device (16), burnout degree
Nozzle (17) is arranged on the hearth wall of boiler furnace (1)；Thick coal culm gas stream burning device (15), thin powdered coal gas stream burning device (16),
Burnout degree nozzle (17) is connected with oxygen bellows (8)；Double-inlet and double-outlet steel ball coal mill (10) and coal dust down-comer (12), coal dust divides
From device (13), coal powder light-dark separation device (14) connects；Coal powder light-dark separation device (14) and thin powdered coal gas stream burning device (16),
Burnout degree nozzle (17) connects.In the present embodiment, realize combustion anthracite Large Copacity (600MW and ratings above) tangential firing mode
Or wall firing mode.There is First air wind powder temperature low, this system optimization First air wind during using unit pulverized-coal system
Powder air-flow, improves its fire behaviour.This combustion system achieves CO2 and reduces discharging, and fundamentally reduces the discharge of nitrogen oxides,
Improve coal dust burn-off rate simultaneously.
The above, above example only in order to technical scheme to be described, is not intended to limit；Although with reference to front
State embodiment the present invention has been described in detail, it will be understood by those within the art that：It still can be to front
State the technical scheme described in each embodiment to modify, or equivalent is carried out to wherein some technical characteristics；And these
Modification or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. one kind carries the large-scale oxygen-enriched combustion system of new direct-firing fuel pulverizing plant anthracite it is characterised in that including：Boiler furnace
(1), oxygen blower fan (3), oxygen preheater (5), oxygen bellows (8), flue gas condenser (7), a flue gas recycled blower fan
(4), a flue gas recycled preheater (6), secondary flue gas recycled blower fan (2), secondary air box (9), feeder (11), coal dust
Down-comer (12), double-inlet and double-outlet steel ball coal mill (10), coal dust classifier (13), coal powder light-dark separation device (14), thick coal culm
Gas stream burning device (15), thin powdered coal gas stream burning device (16), burnout degree nozzle (17)；
The stockhole of described boiler furnace (1) is provided with described oxygen preheater (5) and a described flue gas recycled preheater
(6)；
Described thick coal culm gas stream burning device (15), described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17) setting
Hearth wall in described boiler furnace (1)；
Described thick coal culm gas stream burning device (15), described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17) and institute
State oxygen bellows (8) to connect；
Described double-inlet and double-outlet steel ball coal mill (10) and described coal dust down-comer (12), described coal dust classifier (13), described coal
Powder light-dark separation device (14) connects；
Described coal powder light-dark separation device (14) and described thin powdered coal gas stream burning device (16), described burnout degree nozzle (17) is even
Connect.
2. the large-scale oxygen-enriched combustion system of the new direct-firing fuel pulverizing plant anthracite of band according to claim 1, its feature exists
In described thick coal culm gas stream burning device (15) is connected with described secondary air box (9).
3. the large-scale oxygen-enriched combustion system of the new direct-firing fuel pulverizing plant anthracite of band according to claim 2, its feature exists
In described coal dust down-comer (12) is connected with described feeder (11).
4. the large-scale oxygen-enriched combustion system of the new direct-firing fuel pulverizing plant anthracite of band according to claim 3, its feature exists
In described oxygen preheater (5) is connected with described oxygen blower fan (3).
5. the large-scale oxygen-enriched combustion system of the new direct-firing fuel pulverizing plant anthracite of band according to claim 4, its feature exists
In a described flue gas recycled preheater (6) is connected with a described flue gas recycled blower fan (4).
6. one kind carries the large-scale oxygen-enriched combusting method of new direct-firing fuel pulverizing plant anthracite it is characterised in that including：
Flue gas is entered through once flue gas recycled blower fan (4) pre- after one time flue gas recycled is dried through flue gas condenser (7) eliminating water
Hot device (6), the flue gas after preheating as pulverized coal drying agent enter new unit pulverized-coal system, extract simultaneously partly cold once again
, as temperature regulato, partly cold dry flue gas is as sealing air for circulating flue gas；
Coal pulverizer outlet breeze airflow carries out air-coal separating through venetian blind type light-dark separation device；
Extract secondary flue gas recycled from economizer exit, enter secondary air box (9) after secondary flue gas recycled blower fan (2)；
Enter oxygen preheater (5) from the pure oxygen that air separation unit obtains after oxygen blower fan (3), the oxygen after preheating enters oxygen
Bellows (8), are extracted partial oxidation from oxygen bellows and are mixed in secondary air box (9) with hot secondary flue gas recycled, mixed gas
Enter boiler furnace (1) as secondary wind；
Extract heat smoke, i.e. hot secondary flue gas recycled from economizer exit, mix in secondary air box with part high temperature pure oxygen,
Mixed gas enter boiler furnace as secondary wind.
7. the large-scale oxygen-enriched combusting method of the new direct-firing fuel pulverizing plant anthracite of band according to claim 6, its feature exists
In coal pulverizer outlet breeze airflow carries out air-coal separating through venetian blind type light-dark separation device and specifically includes：
Breeze airflow flows through passage vanes formula dense-and-weak separator (14) after coal dust classifier (13) and carries out air-coal separating.
8. the large-scale oxygen-enriched burning device of the new direct-firing fuel pulverizing plant anthracite of band according to claim 7, its feature exists
In also including：
The 3rd area burning of boiler furnace tissue, thick coal culm air-flow passes through thick coal culm gas stream burning device after mixing with part high temperature pure oxygen
(15) enter lower furnace portion, form sub- Stoichiometric combustion area, in this region, coal dust experience is caught fire, burns and gasified；
Thin powdered coal air-flow enters upper furnace by thin powdered coal gas stream burning device (16) after mixing with part high temperature pure oxygen, is formed micro-
Sub- chemical equivalent area, after all coal dusts in this region experience gas-solid reaction, the unburned composition of gas phase of formation, such as CO, enter after-flame
Area, extracts part pure oxygen from oxygen bellows (8) and enters boiler furnace (1) from burnout degree nozzle (17).
9. the large-scale oxygen-enriched burning device of the new direct-firing fuel pulverizing plant anthracite of band according to claim 8, its feature exists
It is turbulent burner or DC burner in, thick coal culm gas stream burning device (15) and thin powdered coal gas stream burning device (16).
10. the large-scale oxygen-enriched burning device of the new direct-firing fuel pulverizing plant anthracite of band according to claim 7, its feature exists
In a flue gas recycled is as pulverized coal drying agent.
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| CN113175665A (en) * | 2021-04-20 | 2021-07-27 | 西安交通大学 | Semi-coke low-NOx anti-slagging mixed combustion system and method |
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