CN105509085B - A kind of tertiary air air-coal separating reduces the system and method for emission of NOx of boiler - Google Patents
A kind of tertiary air air-coal separating reduces the system and method for emission of NOx of boiler Download PDFInfo
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- CN105509085B CN105509085B CN201510958383.8A CN201510958383A CN105509085B CN 105509085 B CN105509085 B CN 105509085B CN 201510958383 A CN201510958383 A CN 201510958383A CN 105509085 B CN105509085 B CN 105509085B
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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
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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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
- F23C2201/00—Staged combustion
- F23C2201/10—Furnace staging
- F23C2201/101—Furnace staging in vertical direction, e.g. alternating lean and rich zones
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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
- F23C2201/00—Staged combustion
- F23C2201/30—Staged fuel supply
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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
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/06041—Staged supply of oxidant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/30—Separating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/20—Feeding/conveying devices
- F23K2203/201—Feeding/conveying devices using pneumatic means
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Abstract
The invention provides the system that a kind of tertiary air air-coal separating reduces emission of NOx of boiler, tertiary air Powder discharging fan outlet connection fine coal ring shaped separator, the inducer of fine coal ring shaped separator is provided with the separate blade for being used for adjusting dense, thin powdered coal fractional dose, and outlet section is provided with thick coal culm pipe and thin powdered coal pipe；At least one layer of burner hearth main burning area middle and lower part spout of thick coal culm pipe connection, at least one layer of burner hearth main burning area top spout of thin powdered coal pipe connection.Present invention also offers the method that tertiary air air-coal separating reduces emission of NOx of boiler, the tertiary air containing fine breeze is separated into dense, light two strands of breeze airflows, the middle and lower part and top in burner hearth main burning area are sprayed into respectively.Thick coal culm stream substitutes part Secondary Air, and oxygen debt environment, enhancing main burning area reproducibility are formed in main burning area；NOx reducing powers in the rapid ignition consumption oxygen of thin powdered coal stream, enhancing stove；The secondary air flow of main burning area reduction adds to high-order over-fire air, it is ensured that the burn-off rate of coal dust in stove.
Description
Technical field
The system and method for emission of NOx of boiler, more particularly to a kind of tertiary air air-coal separating are reduced the present invention relates to a kind of
Reduce the system and method for emission of NOx of boiler.
Background technology
For the meager coal and anthracite of low volatile, coal-burning power plant of China is relatively more using intermediate storage-type pulverized-coal fired boiler,
The flammability of coal dust can be improved by being primarily due to pulverized coal carried by hot air system.Coal dust after pulverized-coal collector by being largely stored in
In powder cabin, and participation burning in stove is transported to by the use of the hot-air after air preheater is heated as First air, and fine powder is separated
The weary gas of device separation discharge, which carries part fine breeze and is input to as tertiary air in stove, to be burnt.Due to tertiary air high humidity,
Temperature is low, speed is high, and coal powder density is low and particle diameter is small, causes larger interference to burning in stove, particularly the burnout rate in coal dust
The influence of aspect, so as to cause higher NOx emission.According to newest《Fossil-fuel power plant atmospheric pollutant emission standard》
(GB13223-2011) and《Emission standard of air pollutants for boilers》The requirement of (GB 13271-2014), this kind of boiler is typically needed
Transformed, reduce emission of NOx of boiler.At present, the low NOx combusting technology of main flow includes Researched of Air Staging Combustion Burning Pulverized Coal, coal powder recombustion
Etc. technology, but it is limited to the intermediate storage-type boiler effect of low volatile coal.The work of anthracite project is used according to certain
Journey experience, is used after Researched of Air Staging Combustion Burning Pulverized Coal, NOx emission is still in 800~1100mg/Nm to the combustion system with tertiary air3,
And in the case where stopping the operating mode of mill, i.e., enter the situation of burner hearth without tertiary air, while reducing secondary air flow, NOx can be down to 500mg/Nm3
Left and right, it is seen that the presence of tertiary air constrains NOx growing amount significantly.
Currently for the low NOx combustion containing tertiary air boiler, mainly there are following 3 kinds of methods：
First, the fine breeze collected in concentration tertiary air is used as reburning fuel, document《Microfine coal method for concentration in tertiary air
Research》(Ruan Tao, Zhejiang University's Master's thesis in 2006), collected using fine breeze in tertiary air and fire reduction NOx emission method again
And mentioned in system (Chinese patent application 200410052977.4), can relatively efficiently it be concentrated using dynamic separator ultra-fine
Coal dust, this can greatly increase the resistance of pulverized coal channel, and add the complexity of steam generator system, reduce reliability of operation.
2nd, simple air-coal separating, a kind of nitrogen oxides of reduction coal-burning boiler tertiary air burning generation are carried out to tertiary air
Device (Chinese patent application 201120263247.4) in propose to install deep or light additional on tertiary air air channel before tertiary air spout
Separator, is divided into deep or light two strands by tertiary air and arranges (thick coal culm air-flow is under) input burner hearth up and down, make thick coal culm air-flow
It can be burnt in local oxygen debt environment, the NOx of reduction burning generation.Equally, intermediate storage-type coal pulverizing system pulverized coal boiler and
Its tertiary air distribution structure (Chinese patent application 201120172697.2) is also mentioned obtains dense coal using the method for concentration coal dust
Powder air-flow, and spout is arranged in wind snout of the superiors between light tertiary air spout by the method arranged using wall.But
Coal particle size is small (10~20 μm) in tertiary air, easily with air motion, according to conventional simple impacting type, bent-tube boiler or blinds
Window light-dark separation device, air-coal separating DeGrain, it is impossible to reach the effect of concentration coal dust.
3rd, tertiary air nozzle exit area is moved down, the low nitrogen combustion apparatus and application method of middle warehouse formula pulverized coal carried by hot air boiler
(Chinese patent application 201310752275.6) proposes to move down into tertiary air spout near the superiors' First air, by elongating two
Layer tertiary air spout between distance reinforcing tertiary air coal dust firing, and using volatile matter quickly separate out reduction NOx.But for smokeless
The relatively low coal of the volatile matters such as coal, reduces that NOx results are unsatisfactory using this method, and the burn-off rate of upper strata tertiary air is relatively low.
Therefore, for a large amount of NOx of boiler tertiary air burning and exhausting, especially for Low Volatilization Coals, it is necessary to one
Brand-new method and system is planted, to reduce the discharge of NOx in stove combustion process.
The content of the invention
The present invention is to solve the technology that boiler tertiary air NOx emission is too high, unburned carbon in flue dust is high, burn-off rate is relatively low is asked
Topic.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of tertiary air air-coal separating reduction boiler
The system of NOx emission, including feeder, coal pulverizer, mill separator, pulverized-coal collector and tertiary air Powder discharging fan, it is described thin
Powder separator connects Pulverized Coal Bin and tertiary air Powder discharging fan, and Pulverized Coal Bin connects burner hearth by air and powder mixer；
It is characterized in that：
The tertiary air Powder discharging fan outlet connection fine coal ring shaped separator, fine coal ring shaped separator, which is provided with, to be used to adjust
The device of dense, thin powdered coal fractional dose, the outlet section of fine coal ring shaped separator is provided with thick coal culm pipe and thin powdered coal pipe；Thick coal culm pipe
At least one layer of burner hearth main burning area middle and lower part spout of connection, at least one layer of burner hearth main burning area top spout of thin powdered coal pipe connection.
Preferably, it is equipped with adjustable contraction on the thick coal culm pipe and thin powdered coal pipe.
Preferably, the thin powdered coal nozzle being connected with the thin powdered coal pipe is to tilt down 5.Set.
Preferably, the inducer of the fine coal ring shaped separator is provided with the separation for being used for adjusting dense, thin powdered coal fractional dose
Blade, the separate blade is the separate blade that can be turned an angle manually.
Preferably, ± 10 ° be the angle ranging from.
Preferably, dense, light two strands of breeze airflows after the powder dense-and-weak separator separation, air quantity ratio is 1: 1, and powder amount is than big
In 7: 3.
Preferably, the increased resistance of ducting of powder dense-and-weak separator is less than 1500Pa.
Present invention also offers a kind of method that tertiary air air-coal separating reduces emission of NOx of boiler, using above-mentioned three times
The system that wind air-coal separating reduces emission of NOx of boiler, the fine coal ring shaped separator exported by tertiary air Powder discharging fan will contain
The tertiary air of fine breeze is separated into dense, light two strands of breeze airflows, sprays into respectively in burner hearth main burning area middle and lower part and main burning area
Portion.
Preferably, according to air distribution form, at least one layer of high-order over-fire air nozzle of arrangement.
Preferably, the thick coal culm stream substitutes part Secondary Air in main burning area middle and lower part, the oxygen of burning consumption early,
Strengthen the reproducibility in main burning area；Thin powdered coal is on main burning area top, and enhancing main burning area top is to NOx reducing power, phase
High-order over-fire air quantity should be increased, it is ensured that coal dust fully burns in burning-out zone, reduce unburned carbon in flue dust, reduce NOx emission.
The present invention to the fine breeze in tertiary air by carrying out air-coal separating, by the thick coal culm tertiary air obtained after separation,
One to two layers overfire air port is substituted, the burning of burner hearth main burning area middle and lower part is sprayed into, reduces the air quantity in main burning area, formed oxygen debt
Environment, the reproducibility of enhancing main burning area atmosphere, reduces the discharge of NOx in combustion process；Thin powdered coal stream sprays as fine powder fuel
Enter burner hearth main burning area top, rapid burning consumption partial oxidation strengthens the also proper energy to NOx to main burning area upper area
Power；The secondary air flow of main burning area reduction is added into high-order over-fire air simultaneously, increases the burn-off rate of coal dust.Consider one,
2nd, the arrangement of tertiary air, arranges high-order over-fire air nozzle, controls the distribution of the air quantity of different zones and total air stream
Amount, so as to optimize the excess air coefficient in each region, burning can be improved to greatest extent while effectively reduction NOx emission
Efficiency.The method is improving the reducing power of main burning area and its top to NOx, while ensureing that coal dust fully fires in burning-out zone
Burn, reduce unburned carbon in flue dust, reduce NOx.
The system that the present invention is provided overcomes the deficiencies in the prior art, does not change the original pulverized coal preparation system of boiler, in tertiary air
Mill exhauster outlet increase fine coal ring shaped separator, tertiary air is efficiently separated as deep or light two strands of air-flows, thick coal culm stream replacement part
Secondary Air, forms oxygen debt environment in main burning area, and the reproducibility of enhancing main burning area atmosphere reduces NOx discharge；Thin powdered coal stream
Main burning area top is sprayed into, rapid ignition consumes NOx reducing powers in oxygen, enhancing stove；It is secondary that main burning area is reduced
Air quantity adds to high-order over-fire air, it is ensured that the burn-off rate of coal dust in stove.For low volatile anthracite, it is possible to decrease NOx emission
More than 40%.
Brief description of the drawings
Fig. 1 is that tertiary air air-coal separating reduces the system schematic of emission of NOx of boiler；
Fig. 2 is conventional band tertiary air boiler-burner arrangement schematic diagram；
Fig. 3 is the burner arrangement structural representation that embodiment 1 is provided；
Fig. 4 is the burner arrangement structural representation that embodiment 2 is provided；
Fig. 5 is the burner arrangement structural representation that embodiment 3 is provided；
Fig. 6 is the burner arrangement structural representation that embodiment 4 is provided；
Fig. 7 is the burner arrangement structural representation that embodiment 5 is provided；
Fig. 8 is the burner arrangement structural representation that embodiment 6 is provided；
Fig. 9 is the burner arrangement structural representation that embodiment 7 is provided；
Figure 10 is the burner arrangement structural representation that embodiment 8 is provided；
Figure 11 is the burner arrangement structural representation that embodiment 9 is provided.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
Fig. 1 is that tertiary air air-coal separating reduces the system schematic of emission of NOx of boiler, described tertiary air air-coal separating drop
The system of low emission of NOx of boiler includes feeder D, and feeder D is connected by descending drying tube E with coal pulverizer F, mill separator
G connection coal pulverizers F, descending drying tube E and pulverized-coal collector H, pulverized-coal collector H connection Pulverized Coal Bin I and tertiary air Powder discharging fan
M, Pulverized Coal Bin I are via main machine supplying powder K connections air and powder mixer J, air and powder mixer J connection burner hearth；The M connections of tertiary air Powder discharging fan
Fine coal ring shaped separator N.
Fine coal ring shaped separator N inducer is provided with separate blade, can turn an angle manually, can be according to Actual combustion
Situation adjusts the fractional dose of bias pulverized coal；Fine coal ring shaped separator N outlet section is provided with thick coal culm pipe P and thin powdered coal pipe O, dense coal
Adjustable contraction Q is provided with tube cell P and thin powdered coal pipe O.Thick coal culm pipe connection burner hearth middle and lower part spout, thin powdered coal pipe connection stove
Thorax top spout.
Raw coal is heated in advance through feeder D in descending drying tube E by hot blast, the coal dust warp after being ground into coal pulverizer F
Mill separator G separation is crossed, unqualified coal dust returns to coal pulverizer and refaced, and qualified coal dust is sieved into pulverized-coal collector H, is separated
Coal dust enter Pulverized Coal Bin I, be mixed into burner hearth with hot blast in air and powder mixer J via main machine supplying powder K.Pulverized-coal collector H
The weary gas (tertiary air) produced after separation, then be sequentially connected tertiary air Powder discharging fan M fine coal ring shaped separator N, and separator is dense
The thick coal culm pipe P and thin powdered coal pipe O of light separator N outlets fire again with burner hearth middle and lower part burner nozzle and upper furnace respectively
Expect spout connection, burnt in boiler A.Boiler A tail ends are provided with air preheater B, pressure fan C, primary air fan L, secondary air box R
It is all connected with air preheater B.
By the way that burner hearth is divided into three relatively independent parts：Main burning area, NOx reducing zones and fuel burning-out zone, it is comprehensive
Consider the arrangement of one, two, three wind, the distribution of the air quantity of different zones and total air mass flow are controlled, so as to optimize
The excess air coefficient in each region, efficiency of combustion can be improved to greatest extent while effectively reduction NOx emission.Pass through hand
Dynamic regulation separate blade angle ensures separating effect, and the increased resistance of separator can be solved by adjustable contraction.
Fig. 2 is the general arrangement of intermediate storage-type pulverized-coal fired boiler, such as certain 350MW supercritical boiler set：Main combustion
Burn area and use tangential firing system, be sequentially arranged several shutter horizontal bias and strengthen catch fire wind snout 1, a several Secondary Airs
Two tertiary air spouts 4, a fire air nozzles 5, top layout are arranged in spout 2, several alopecia areata spouts 3, main burning area top
One group of three floor height position fire air nozzle 6.
For the 350MW supercritical boiler sets, the following typical arrangement side according to deep or light tertiary air is now enumerated
The improvement project of formula.
Embodiment 1
The burner arrangement structure that Fig. 3 provides for the present embodiment.With reference to Fig. 2, Fig. 3, the dense powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 70%), sprayed into by the dense powder spout 7 of two layers of tertiary air in the middle part of main burning area, and it is arranged apart, replace respectively
Two layers of overfire air port 2, reduces the oxygen amount in main burning area, main burning area is in oxygen debt reducing atmosphere, is produced beneficial to burning
Raw NOx reduction.18 μm of thick coal culm average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with quick-reaction capability,
A large amount of reproducibility particles can be formed in the short period of time and finite concentration is kept, and reduction NOx effects are notable.Tertiary air is isolated
The light powder (accounting for the former powder amount of tertiary air 30%) come, sprays into main burning area topmost by the light powder spout 8 of two layers of tertiary air, replaces respectively
One layer of tertiary air spout 4 and fire air nozzle 5 are changed, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can be changed
Kind burner carries out the condition of convection current radiation heat transfer with upstream high-temperature flue gas, strengthens catching fire for fine breeze in light tertiary air, another
Aspect can extend coal dust in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, and can catch fire rapidly after-flame, so both
Main burning area top oxygen amount can be reduced, does not also result in that coal dust burn-off rate is too low, so as to increase the reduction of main burning area coal dust
Distance；And one layer of tertiary air spout 4 is changed to overfire air port 2；The secondary air flow of main burning area reduction simultaneously, adds to a high position
Burnout degree, sprays into burning-out zone by one group of three floor height position fire air nozzle 6, so as to ensure the burn-off rate of coal dust in stove, improves coal
Powder efficiency of combustion.
Embodiment 2
The burner arrangement structure that Fig. 4 provides for the present embodiment.With reference to Fig. 2, Fig. 4, the dense powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 70%), main burning area middle and lower part, the dense powder spray of one layer of tertiary air are sprayed into by the dense powder spout 7 of two layers of tertiary air
Mouth 7 sprays into main burning area foots, and another dense powder spout 7 of floor tertiary air is sprayed into the middle part of main burning area, is replaced two layers of Secondary Air and is sprayed
Mouth 2, reduces the oxygen amount in main burning area, main burning area is in oxygen debt reducing atmosphere, and NOx reduction is produced beneficial to burning.It is dense
18 μm of coal dust average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with quick-reaction capability, can be when shorter
Interior to form a large amount of reproducibility particles and keep finite concentration, reduction NOx effects are notable.The light powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 30%), main burning area topmost is sprayed into by the light powder spout 8 of two layers of tertiary air, replace respectively one layer three times
Wind snout 4 and fire air nozzle 5, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can improve burner with
Upstream high-temperature flue gas carries out the condition of convection current radiation heat transfer, strengthens catching fire for fine breeze in light tertiary air, on the other hand can extend
Coal dust in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, can catch fire rapidly after-flame, can so reduce main combustion
Area top oxygen amount is burnt, does not also result in that coal dust burn-off rate is too low, so as to increase the reduction distance of main burning area coal dust；And by one
Layer tertiary air spout 4 is changed to overfire air port 2；The secondary air flow of main burning area reduction simultaneously, adds to high-order over-fire air, passes through
One group of three floor height position fire air nozzle 6 sprays into burning-out zone, so as to ensure the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 3
The burner arrangement structure that Fig. 5 provides for the present embodiment.With reference to Fig. 2, Fig. 5, the dense powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 70%), sprayed into by the dense powder spout 7 of two layers of tertiary air in the middle part of main burning area, and be adjacently positioned, replace two layers
Overfire air port 2, reduces the oxygen amount in main burning area, main burning area is in oxygen debt reducing atmosphere, and NOx is produced beneficial to burning
Reduction.18 μm of thick coal culm average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with quick-reaction capability, can be
A large amount of reproducibility particles are formed in the shorter time and finite concentration is kept, reduction NOx effects are notable.What tertiary air was separated
Light powder (accounting for the former powder amount of tertiary air 30%), sprays into main burning area top by the light powder spout 8 of two layers of tertiary air, one layer is replaced respectively
Tertiary air spout 4 and fire air nozzle 5, and arranged for interval, spout is arranged using having a down dip 5 °, is close to main burning area top, a side
Face can improve the condition that burner carries out convection current radiation heat transfer with upstream high-temperature flue gas, strengthen fine breeze in light tertiary air
Fire, on the other hand can extend coal dust in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, and can catch fire rapidly combustion
To the greatest extent, main burning area top oxygen amount can be so reduced, it is too low also not result in coal dust burn-off rate, so as to increase main burning area coal
The reduction distance of powder；And one layer of tertiary air spout 4 is changed to overfire air port 2；The secondary air flow of main burning area reduction simultaneously, is mended
High-order over-fire air is charged to, burning-out zone is sprayed into by two group of two floor height position fire air nozzle 6, so as to ensure the after-flame of coal dust in stove
Rate, improves Combustion Efficiency of Coal Powder.
Embodiment 4
The burner arrangement structure that Fig. 6 provides for the present embodiment.With reference to Fig. 2, Fig. 6, the dense powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 70%), main burning area bottom is sprayed into by the dense powder spout 7 of a floor tertiary air, one layer of overfire air port is replaced
2, the oxygen amount in main burning area is reduced, main burning area is in oxygen debt reducing atmosphere, NOx reduction is produced beneficial to burning.Dense coal
18 μm of powder average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, can be in the shorter time with quick-reaction capability
Interior to form a large amount of reproducibility particles and keep finite concentration, reduction NOx effects are notable.The light powder that tertiary air is separated (accounts for original
The powder amount of tertiary air 30%), main burning area top is sprayed into by the light powder spout 8 of two layers of tertiary air, one layer of tertiary air spray is replaced respectively
Mouth 4 and fire air nozzle 5, and arranged for interval, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can be improved
Burner carries out the condition of convection current radiation heat transfer with upstream high-temperature flue gas, strengthens catching fire for fine breeze in light tertiary air, the opposing party
Face can extend coal dust in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, and can catch fire rapidly after-flame, so can
Reduce main burning area top oxygen amount, also do not result in that coal dust burn-off rate is too low, thus increase the reduction of main burning area coal dust away from
From；And one layer of tertiary air spout 4 is changed to overfire air port 2；The secondary air flow of main burning area reduction simultaneously, adds to high-order combustion
Wind, sprays into burning-out zone by one group of two floor height position fire air nozzle 6, so as to ensure the burn-off rate of coal dust in stove, improves coal dust to the greatest extent
Efficiency of combustion.
Embodiment 5
The burner arrangement structure that Fig. 7 provides for the present embodiment.With reference to Fig. 2, Fig. 7, the dense powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 70%), main burning area middle and lower part, the dense powder spray of one layer of tertiary air are sprayed into by the dense powder spout 7 of two layers of tertiary air
Mouth 7 sprays into main burning area foots, and another dense powder spout 7 of floor tertiary air is sprayed into the middle part of main burning area, is replaced two layers of Secondary Air and is sprayed
Mouth 2, reduces the oxygen amount in main burning area, main burning area is in oxygen debt reducing atmosphere, and NOx reduction is produced beneficial to burning.It is dense
18 μm of coal dust average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with quick-reaction capability, can be when shorter
Interior to form a large amount of reproducibility particles and keep finite concentration, reduction NOx effects are notable.The light powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 30%), main burning area top is sprayed into by the light powder spout 8 of a floor tertiary air, one layer of tertiary air spout is replaced
4, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can improve burner and the progress pair of upstream high-temperature flue gas
The condition of radiation heat transfer is flowed, strengthens catching fire for fine breeze in light tertiary air, on the other hand can extend coal dust in residing time in furnace
With sharp after-flame, 12 μm of thin powdered coal average grain diameter, can catch fire rapidly after-flame, can so reduce main burning area top oxygen amount, also not
Coal dust burn-off rate can be caused too low, so as to increase the reduction distance of main burning area coal dust；And be changed to one layer of tertiary air spout 4
Overfire air port 2；The secondary air flow of main burning area reduction simultaneously, adds to high-order over-fire air, passes through one group two layers and one group
One floor height position fire air nozzle 6 sprays into burning-out zone, so as to ensure the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 6
The burner arrangement structure that Fig. 8 provides for the present embodiment.With reference to Fig. 2, Fig. 8, the dense powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 70%), main burning area middle and lower part is sprayed into by the dense powder spout 7 of a floor tertiary air, one layer of Secondary Air spray is replaced
Mouth 2, reduces the oxygen amount in main burning area, main burning area is in oxygen debt reducing atmosphere, and NOx reduction is produced beneficial to burning.It is dense
18 μm of coal dust average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with quick-reaction capability, can be when shorter
Interior to form a large amount of reproducibility particles and keep finite concentration, reduction NOx effects are notable；The light powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 30%), main burning area top is sprayed into by the light powder spout 8 of three floor tertiary air, two layers of tertiary air are replaced respectively
Spout 4 and fire air nozzle 5, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can improve burner with it is upper
The condition that high-temperature flue gas carries out convection current radiation heat transfer is swum, strengthens catching fire for fine breeze in light tertiary air, on the other hand can extend coal
Powder in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, can catch fire rapidly after-flame, can so reduce main burning
Area top oxygen amount, does not result in that coal dust burn-off rate is too low yet, so as to increase the reduction distance of main burning area coal dust；Main combustion simultaneously
The secondary air flow of area's reduction is burnt, high-order over-fire air is added to, burning-out zone is sprayed into by one group of two floor height position fire air nozzle 6, from
And ensure the burn-off rate of coal dust in stove, improve Combustion Efficiency of Coal Powder.
Embodiment 7
The burner arrangement structure that Fig. 9 provides for the present embodiment.With reference to Fig. 2, Fig. 9, the dense powder that tertiary air is separated (is accounted for
The former powder amount of tertiary air 70%), main burning area middle and lower part, the dense powder spray of one layer of tertiary air are sprayed into by the dense powder spout 7 of three floor tertiary air
Mouth 7 sprays into main burning area foots, and the another dense powder spout 7 of two floor tertiary air is sprayed into the middle part of main burning area, and is adjacently positioned, and replaces three
Layer overfire air port 2, reduces the oxygen amount in main burning area, main burning area is in oxygen debt reducing atmosphere, is produced beneficial to burning
NOx is reduced.18 μm of thick coal culm average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with quick-reaction capability, energy
A large amount of reproducibility particles are formed in the short period of time and finite concentration is kept, and reduction NOx effects are notable.Tertiary air is separated
Light powder (accounting for the former powder amount of tertiary air 30%), pass through the light powder spout 8 of three floor tertiary air and spray into main burning area top, replace two layer three
Secondary wind snout 4 and fire air nozzle 5, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can be improved burner
The condition of convection current radiation heat transfer is carried out with upstream high-temperature flue gas, strengthens catching fire for fine breeze in light tertiary air, on the other hand can prolong
Long coal dust in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, can catch fire rapidly after-flame, can so reduce master
Combustion zone top oxygen amount, does not result in that coal dust burn-off rate is too low yet, so as to increase the reduction distance of main burning area coal dust；Simultaneously
The secondary air flow of main burning area reduction, adds to high-order over-fire air, is sprayed by one group two layers and one group of three layers of high-order over-fire air
Mouth 6 sprays into burning-out zones, so as to ensure the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 8
The burner arrangement structure that Figure 10 provides for the present embodiment.With reference to Fig. 2, Figure 10, the dense powder that tertiary air is separated
(accounting for the former powder amount of tertiary air 70%), sprays into main burning area middle and lower part, and arranged for interval by the dense powder spout 7 of two floor tertiary air, replaces
Two layers of overfire air port 2 are changed, the oxygen amount in main burning area is reduced, main burning area is in oxygen debt reducing atmosphere, beneficial to burning
Produce NOx reduction.18 μm of thick coal culm average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with fast reaction energy
Power, can form a large amount of reproducibility particles in the short period of time and keep finite concentration, and reduction NOx effects are notable.Tertiary air point
The light powder (accounting for the former powder amount of tertiary air 30%) come is separated out, main burning area top is sprayed into by the light powder spout 8 of three floor tertiary air, replaced
Two layers of tertiary air spout 4 and fire air nozzle 5, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can be improved
Burner carries out the condition of convection current radiation heat transfer with upstream high-temperature flue gas, strengthens catching fire for fine breeze in light tertiary air, the opposing party
Face can extend coal dust in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, and can catch fire rapidly after-flame, so can
Reduce main burning area top oxygen amount, also do not result in that coal dust burn-off rate is too low, thus increase the reduction of main burning area coal dust away from
From；The secondary air flow of main burning area reduction simultaneously, adds to high-order over-fire air, is sprayed by one group of three floor height position fire air nozzle 6
Enter burning-out zone, so as to ensure the burn-off rate of coal dust in stove, improve Combustion Efficiency of Coal Powder.
Embodiment 9
The burner arrangement structure that Figure 11 provides for the present embodiment.With reference to Fig. 2, Figure 11, the dense powder that tertiary air is separated
(accounting for the former powder amount of tertiary air 70%), sprays into main burning area middle and lower part, two-by-two arranged for interval by the dense powder spout 7 of three floor tertiary air,
Three layers of overfire air port 2 are replaced, the oxygen amount in main burning area is reduced, main burning area is in oxygen debt reducing atmosphere, beneficial to combustion
Burn and produce NOx reduction.18 μm of thick coal culm average grain diameter, as a kind of fine breeze, catches fire rapid, gasification is fast, with fast reaction
Ability, can form a large amount of reproducibility particles in the short period of time and keep finite concentration, and reduction NOx effects are notable.Tertiary air
The light powder (accounting for the former powder amount of tertiary air 30%) separated, sprays into main burning area top by the light powder spout 8 of three floor tertiary air, replaces
Two layers of tertiary air spout 4 and fire air nozzle 5 are changed, spout is arranged using having a down dip 5 °, is close to main burning area top, on the one hand can be changed
Kind burner carries out the condition of convection current radiation heat transfer with upstream high-temperature flue gas, strengthens catching fire for fine breeze in light tertiary air, another
Aspect can extend coal dust in residing time in furnace with sharp after-flame, 12 μm of thin powdered coal average grain diameter, and can catch fire rapidly after-flame, so both
Main burning area top oxygen amount can be reduced, does not also result in that coal dust burn-off rate is too low, so as to increase the reduction of main burning area coal dust
Distance；The secondary air flow of main burning area reduction simultaneously, adds to high-order over-fire air, passes through one group of four floor height position fire air nozzle 6
Burning-out zone is sprayed into, so as to ensure the burn-off rate of coal dust in stove, Combustion Efficiency of Coal Powder is improved.
Claims (9)
1. the system that a kind of tertiary air air-coal separating reduces emission of NOx of boiler, including feeder (D), coal pulverizer (F), coarse powder point
From device (G), pulverized-coal collector (H) and tertiary air Powder discharging fan (M), the pulverized-coal collector (H) connects Pulverized Coal Bin (I) and three times
Wind Powder discharging fan (M), Pulverized Coal Bin (I) connects burner hearth by air and powder mixer (J)；
It is characterized in that：
Tertiary air Powder discharging fan (M) the outlet connection fine coal ring shaped separator (N), fine coal ring shaped separator (N) is provided with use
In the device for adjusting dense, thin powdered coal fractional dose, the outlet section of fine coal ring shaped separator (N) is provided with thick coal culm pipe (P) and light coal
Tube cell (O)；At least one layer of burner hearth main burning area middle and lower part spout of thick coal culm pipe (P) connection, thin powdered coal pipe (O) connection is at least one layer of
Burner hearth main burning area top spout；
The thin powdered coal nozzle being connected with the thin powdered coal pipe (O) is to tilt down 5 ° of settings.
2. the system that a kind of tertiary air air-coal separating as claimed in claim 1 reduces emission of NOx of boiler, it is characterised in that：Institute
State and be equipped with adjustable contraction (Q) on thick coal culm pipe (P) and thin powdered coal pipe (O).
3. the system that a kind of tertiary air air-coal separating as claimed in claim 1 reduces emission of NOx of boiler, it is characterised in that：Institute
The inducer for stating fine coal ring shaped separator (N) is provided with the separate blade for being used for adjusting dense, thin powdered coal fractional dose, the separation leaf
Piece is the separate blade that can be turned an angle manually.
4. the system that a kind of tertiary air air-coal separating as claimed in claim 3 reduces emission of NOx of boiler, it is characterised in that：Institute
Angle is stated for ± 10 °.
5. the system that a kind of tertiary air air-coal separating as claimed in claim 1 reduces emission of NOx of boiler, it is characterised in that：Institute
Dense, light two strands of breeze airflows after powder dense-and-weak separator (N) separation are stated, air quantity ratio is 1：1, powder amount ratio is 7：3.
6. the system that a kind of tertiary air air-coal separating as claimed in claim 1 reduces emission of NOx of boiler, it is characterised in that：Institute
Powder dense-and-weak separator (N) increased resistance of ducting is stated less than 1500Pa.
7. a kind of method that tertiary air air-coal separating reduces emission of NOx of boiler, it is characterised in that using such as claim 1~7 times
The system that tertiary air air-coal separating described in one reduces emission of NOx of boiler, the coal dust exported by tertiary air Powder discharging fan (M)
Dense-and-weak separator (N), dense, light two strands of breeze airflows are separated into by the tertiary air containing fine breeze, and burner hearth main burning is sprayed into respectively
Area middle and lower part and main burning area top.
8. the method that tertiary air air-coal separating as claimed in claim 7 reduces emission of NOx of boiler, it is characterised in that：According to
Wind form, at least one layer of high-order over-fire air nozzle of arrangement.
9. the method that tertiary air air-coal separating as claimed in claim 7 or 8 reduces emission of NOx of boiler, it is characterised in that：Dense coal
Powder stream substitutes part Secondary Air in main burning area middle and lower part, the oxygen of burning consumption early, the reproducibility in enhancing main burning area；It is light
Coal dust is on main burning area top, and enhancing main burning area top is to NOx reducing power, corresponding increase high-order over-fire air quantity, it is ensured that
Coal dust fully burns in burning-out zone, reduces unburned carbon in flue dust, reduces NOx emission.
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| CN106765273B (en) * | 2016-12-02 | 2023-09-22 | 北京国电龙高科环境工程技术有限公司 | Exhaust gas powder feeding boiler combustion system with tertiary air separation |
| CN106439890A (en) * | 2016-12-02 | 2017-02-22 | 北京国电龙高科环境工程技术有限公司 | Hot wind pulverized coal feeding boiler combustion system having tertiary air separation function |
| CN106871110B (en) * | 2017-01-18 | 2019-01-22 | 上海发电设备成套设计研究院 | Low ignition heat ultra-low load steady for thermal power plant's unit pulverized-coal system fires system |
| CN107084387B (en) * | 2017-06-12 | 2022-08-30 | 清华大学 | Multi-process low-NOx horizontal circulating fluidized bed boiler with flue gas back combustion function |
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| CN107806631A (en) * | 2017-11-09 | 2018-03-16 | 无锡华光锅炉股份有限公司 | Boiler tertiary air arrangement |
| CN108240618A (en) * | 2018-03-22 | 2018-07-03 | 上海锅炉厂有限公司 | A kind of tertiary air air-coal separating burner |
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| CN109404893A (en) * | 2018-11-09 | 2019-03-01 | 中节环立为（武汉）能源技术有限公司 | A kind of tertiary air coal dust separation system |
| CN111006206B (en) * | 2019-12-13 | 2021-07-27 | 华中科技大学 | Flameless classified oxygen-enriched low-NOx combustion method and system |
| CN110925747B (en) * | 2019-12-19 | 2024-06-07 | 上海交通大学 | Combustion device convenient for directly injecting coal water slurry into low-oxygen flame to reduce NOx |
| CN114110569A (en) * | 2021-09-28 | 2022-03-01 | 清华大学 | Combustion system and combustion method of intermediate storage type pulverized coal fired boiler |
| CN114688523A (en) * | 2022-03-31 | 2022-07-01 | 福建龙净环保股份有限公司 | Mix coal fired boiler system who burns mud |
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| JP2000111007A (en) * | 1998-10-09 | 2000-04-18 | Ishikawajima Harima Heavy Ind Co Ltd | Pulverized coal burning boiler |
| JP2004183984A (en) * | 2002-12-03 | 2004-07-02 | Mitsubishi Heavy Ind Ltd | Fine powder solid fuel firing burner and method and boiler for burning fine powder solid fuel |
| CN201445873U (en) * | 2009-06-10 | 2010-05-05 | 徐州燃控科技股份有限公司 | An on-line adjustable circular Persian blinds light and shade separator |
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| CN205372606U (en) * | 2015-12-18 | 2016-07-06 | 上海锅炉厂有限公司 | System for deep or light separation of tertiary air reduces boiler NOx and discharges |
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