CN205372606U - System for deep or light separation of tertiary air reduces boiler NOx and discharges - Google Patents
System for deep or light separation of tertiary air reduces boiler NOx and discharges Download PDFInfo
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- CN205372606U CN205372606U CN201521069010.7U CN201521069010U CN205372606U CN 205372606 U CN205372606 U CN 205372606U CN 201521069010 U CN201521069010 U CN 201521069010U CN 205372606 U CN205372606 U CN 205372606U
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Abstract
The utility model provides a system for deep or light separation of tertiary air reduces boiler NOx and discharges, the deep or light separator of tertiary air exhauster exit linkage buggy, the inducer of the deep or light separator of buggy is equipped with and is used for adjusting the separation blade that separation dense, light buggy was measured, and the export section is equipped with dense buggy pipe and light buggy pipe, lower part spout in the at least one deck furnace owner combustion area of dense buggy union coupling, the at least one deck furnace owner combustion area upper portion spout of light buggy union coupling. Well lower part and upper portion into furnace owner combustion area are spouted respectively for two gangs of dense, light pulverized coal air flow to the tertiary air separation that the deep or light separator of buggy will contain the duff powder. Dense pulverized coal flow substitutes partial overgrate air, forms oxygen debt environment in main combustion area, strengthens still originality of main combustion area, light pulverized coal flow catches fire rapidly to burn and consumes oxygen, NOx reducing ability in the reinforcing stove, the secondary amount of wind that reduce main combustion area replenishes high -order after -flame wind, has guaranteed the burn -off rate of the interior buggy of stove.
Description
Technical field
This utility model relates to a kind of system reducing emission of NOx of boiler, particularly relates to a kind of tertiary air air-coal separating and reduces the system of emission of NOx of boiler.
Background technology
For meager coal and the anthracite of low volatile, coal-burning power plant of China adopts intermediate storage-type pulverized-coal fired boiler relatively more, is primarily due to pulverized coal carried by hot air system and can improve the flammability of coal dust.Coal dust is stored in powder cabin by major part after pulverized-coal collector, and utilize the hot-air after air preheater heats to be transported in stove as First air to participate in burning, and pulverized-coal collector separates the weary gas discharged and carries part fine breeze and be input in stove as tertiary air and burn.Due to tertiary air high humidity, temperature is low, speed is high, and coal powder density is low and particle diameter is little, and burning in stove is caused larger interference, and the particularly impact in the burnout rate of coal dust, thus causing higher NOx emission.Requirement according to up-to-date " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) and " emission standard of air pollutants for boilers " (GB13271-2014), this kind of boiler, it is generally required to transform, reduces emission of NOx of boiler.At present, the low NOx combusting technology of main flow includes the technology such as Researched of Air Staging Combustion Burning Pulverized Coal, coal powder recombustion, but the intermediate storage-type boiler limited efficiency to low volatile coal.Using the engineering experience of anthracite project according to certain, after the combustion system with tertiary air is adopted Researched of Air Staging Combustion Burning Pulverized Coal, NOx emission is still at 800～1100mg/Nm3, and under the operating mode stopping mill, namely enter the situation of burner hearth without tertiary air, and reducing secondary air flow simultaneously, NOx can be down to 500mg/Nm3Left and right, it is seen that the existence of tertiary air constrains the growing amount of NOx significantly.
Currently for the low NOx combustion containing tertiary air boiler, mainly there are following 3 kinds of methods:
One, the fine breeze in concentration tertiary air is collected as reburning fuel, document " in tertiary air the research of microfine coal method for concentration " (Ruan Tao, Zhejiang University's Master's thesis in 2006), utilize in tertiary air fine breeze to collect combustion again to reduce in NOx emission method and system (Chinese patent application 200410052977.4) and mention, dynamic separator is adopted can relatively efficiently to concentrate microfine coal, this can be greatly increased the resistance of pulverized coal channel, and add the complexity of steam generator system, reduce reliability of operation.
Two, tertiary air is carried out simple air-coal separating, a kind of device (Chinese patent application 201120263247.4) reducing the nitrogen oxides that the burning of coal-burning boiler tertiary air generates proposes to install light-dark separation device additional on the tertiary air air channel before tertiary air spout, tertiary air is divided into deep or light two strands and arrange (thick coal culm air-flow under) input burner hearth up and down, make thick coal culm air-flow can burn in the oxygen debt environment in local, reduce the NOx that burning generates.Equally, intermediate storage-type coal pulverizing system pulverized coal boiler and tertiary air distribution structure (Chinese patent application 201120172697.2) thereof are also mentioned and are adopted the method for concentration coal dust to obtain thick coal culm air-flow, and adopt the method that wall is arranged spout to be arranged in the superiors' First air spout between light tertiary air spout.But coal particle size little (10～20 μm) in tertiary air, easily with air motion, according to conventional simple and easy impacting type, bent-tube boiler or venetian blind type light-dark separation device, air-coal separating DeGrain, it is impossible to reach the effect of concentration coal dust.
Three, tertiary air nozzle exit area is moved down, the low nitrogen combustion apparatus of middle warehouse formula pulverized coal carried by hot air boiler and using method (Chinese patent application 201310752275.6) propose to move down near the superiors' First air by tertiary air spout, by elongating the distance strengthening tertiary air coal dust firing between two-layer tertiary air spout, and volatile matter is utilized quickly to precipitate out reduction NOx.But for the coal that the volatile matters such as anthracite are relatively low, utilize the method unsatisfactory to reduce NOx result, 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 For Low Volatilization Coals, it is necessary to a kind of brand-new method and system, the discharge of NOx in stove combustion process is reduced.
Utility model content
To be solved in the utility model is the technical problem that boiler tertiary air NOx emission is too high, unburned carbon in flue dust is high, burn-off rate is relatively low.
In order to solve above-mentioned technical problem, the technical solution of the utility model is to provide a kind of tertiary air air-coal separating and reduces the system of emission of NOx of boiler, including feeder, coal pulverizer, mill separator, pulverized-coal collector and tertiary air Powder discharging fan, described pulverized-coal collector 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 outlet of described tertiary air Powder discharging fan connects fine coal ring shaped separator, and fine coal ring shaped separator is provided with the device of the fractional dose for adjusting dense, thin powdered coal, and 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 connects middle and lower part, at least one of which burner hearth main combustion zone spout, and thin powdered coal pipe connects top, at least one of which burner hearth main combustion zone spout.
Preferably, described thick coal culm pipe and thin powdered coal pipe are equipped with adjustable contraction.
Preferably, the thin powdered coal nozzle being connected with described thin powdered coal pipe is downward-sloping 5 ° of settings.
Preferably, the inducer of described fine coal ring shaped separator is provided with the separate blade of the fractional dose for adjusting dense, thin powdered coal, and described separate blade is can the separate blade of hand rotation certain angle.
Preferably, the angle ranging from ± 10 °.
Preferably, the two strands of breeze airflows dense, light after the separation of described powder dense-and-weak separator, air quantity ratio is 1: 1, and powder amount ratio is more than 7: 3.
Preferably, the resistance of ducting that described powder dense-and-weak separator increases is less than 1500Pa.
This utility model additionally provides a kind of method that tertiary air air-coal separating reduces emission of NOx of boiler, above-mentioned tertiary air air-coal separating is adopted to reduce the system of emission of NOx of boiler, by the fine coal ring shaped separator that tertiary air Powder discharging fan exports, tertiary air containing fine breeze is separated into two strands of breeze airflows dense, light, sprays into burner hearth middle and lower part, main combustion zone and top, main combustion zone respectively.
Preferably, according to air distribution form, arrange at least one of which high-order over-fire air nozzle.
Preferably, described thick coal culm stream is in middle and lower part, main combustion zone, and Substitute For Partial secondary wind, burning early consumes oxygen, strengthens the reproducibility of main combustion zone；Thin powdered coal, on top, main combustion zone, strengthens the top, the main combustion zone reducing power to NOx, corresponding increase high-order over-fire air quantity, it is ensured that coal dust fully burns at burning-out zone, reduces unburned carbon in flue dust, reduces NOx emission.
This utility model is by carrying out air-coal separating to the fine breeze in tertiary air, the thick coal culm tertiary air that will obtain after separation, substitute one and arrive two-layer overfire air port, spray into the burning of middle and lower part, burner hearth main combustion zone, reduce the air quantity of main combustion zone, form oxygen debt environment, strengthen the reproducibility of main combustion zone atmosphere, reduce the discharge of NOx in combustion process；Thin powdered coal stream sprays into top, burner hearth main combustion zone as fine powder fuel, and rapidly burning consumes partial oxidation, strengthens the main combustion zone upper area reducing power to NOx；The secondary air flow that main combustion zone is reduced is added to high-order over-fire air simultaneously, increases the burn-off rate of coal dust.Consider the arrangement of one, two, three wind, arrange high-order over-fire air nozzle, controlling the distribution of the air quantity of zones of different and total air mass flow, thus optimizing the excess air coefficient in each region, efficiency of combustion can be improved to greatest extent while effectively reducing NOx emission.The method is improving main combustion zone and the top reducing power to NOx thereof, ensures that coal dust fully burns at burning-out zone simultaneously, reduces unburned carbon in flue dust, reduces NOx.
The system that this utility model provides overcomes the deficiencies in the prior art, do not change the original pulverized coal preparation system of boiler, fine coal ring shaped separator is increased in the outlet of tertiary air mill exhauster, tertiary air is efficiently separated into deep or light two strands of air-flows, thick coal culm stream Substitute For Partial secondary wind, form oxygen debt environment in main combustion zone, strengthen the reproducibility of main combustion zone atmosphere, reduce the discharge of NOx；Thin powdered coal stream sprays into top, main combustion zone, and rapid ignition consumes oxygen, strengthens NOx reducing power in stove；The secondary air flow that main combustion zone is reduced 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%.
Accompanying drawing explanation
Fig. 1 is the system schematic that tertiary air air-coal separating reduces emission of NOx of boiler；
Fig. 2 is conventional band tertiary air boiler-burner arrangement schematic diagram；
The burner arrangement structural representation that Fig. 3 provides for embodiment 1；
The burner arrangement structural representation that Fig. 4 provides for embodiment 2；
The burner arrangement structural representation that Fig. 5 provides for embodiment 3；
The burner arrangement structural representation that Fig. 6 provides for embodiment 4；
The burner arrangement structural representation that Fig. 7 provides for embodiment 5；
The burner arrangement structural representation that Fig. 8 provides for embodiment 6；
The burner arrangement structural representation that Fig. 9 provides for embodiment 7；
The burner arrangement structural representation that Figure 10 provides for embodiment 8；
The burner arrangement structural representation that Figure 11 provides for embodiment 9.
Detailed description of the invention
Below in conjunction with specific embodiment, this utility model is expanded on further.Should be understood that these embodiments are merely to illustrate this utility model rather than limit scope of the present utility model.In addition, it is to be understood that after having read the content that this utility model is lectured, this utility model can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application appended claims limited range equally.
Fig. 1 is the system schematic that tertiary air air-coal separating reduces emission of NOx of boiler, described tertiary air air-coal separating reduces the system of emission of NOx of boiler and includes feeder D, feeder D is connected with coal pulverizer F by descending drying tube E, mill separator G connects coal pulverizer F, descending drying tube E and pulverized-coal collector H, pulverized-coal collector H connects Pulverized Coal Bin I and tertiary air Powder discharging fan M, Pulverized Coal Bin I connects air and powder mixer J, air and powder mixer J via main machine supplying powder K and connects burner hearth；Tertiary air Powder discharging fan M connects fine coal ring shaped separator N.
The inducer of fine coal ring shaped separator N is provided with separate blade, can hand rotation certain angle, can according to Actual combustion situation adjust bias pulverized coal fractional dose；The outlet section of fine coal ring shaped separator N is provided with thick coal culm pipe P and thin powdered coal pipe O, thick coal culm pipe P and is provided with adjustable contraction Q on thin powdered coal pipe O.Thick coal culm pipe connects burner hearth middle and lower part spout, and thin powdered coal pipe connects upper furnace spout.
Raw coal is heated by hot blast in descending drying tube E in advance through feeder D, enter the coal dust after coal pulverizer F grinds to separate through mill separator G, defective coal dust returns coal pulverizer and refaces, qualified coal dust enters pulverized-coal collector H screening, separated coal dust enters Pulverized Coal Bin I, is mixed into burner hearth with hot blast via main machine supplying powder K in air and powder mixer J.The weary gas (tertiary air) that pulverized-coal collector H produces after separating, then it is sequentially connected with the fine coal ring shaped separator N of tertiary air Powder discharging fan M, the thick coal culm pipe P and thin powdered coal pipe O of separator dense-and-weak separator N outlet are connected with burner hearth middle and lower part burner nozzle and upper furnace reburning fuel spout respectively, burn in boiler A.Boiler A tail end is provided with air preheater B, pressure fan C, primary air fan L, secondary air box R are all connected with air preheater B.
By burner hearth being divided into three relatively independent parts: main combustion zone, NOx reducing zone and fuel burning-out zone, consider the arrangement of one, two, three wind, control the distribution of the air quantity of zones of different and total air mass flow, thus optimizing the excess air coefficient in each region, efficiency of combustion can be improved to greatest extent while effectively reducing NOx emission.Manually regulating separate blade angle and ensure separating effect, the resistance that separator increases can be solved by adjustable contraction.
Fig. 2 is the arrangement that intermediate storage-type pulverized-coal fired boiler is general, such as certain 350MW supercritical boiler set: main combustion zone adopts tangential firing system, it is sequentially arranged several shutter horizontal bias and strengthens catch fire First air spout 1, several overfire air port 2, several alopecia areata spout 3,4, fire air nozzle 5 of two tertiary air spouts, one group of three layers high-order over-fire wind snout 6 of top layout are arranged in top, main combustion zone.
For this 350MW supercritical boiler set, now enumerate the improvement project of the following typical arrangement according to deep or light tertiary air.
Embodiment 1
The burner arrangement structure that Fig. 3 provides for the present embodiment.In conjunction with Fig. 2, Fig. 3, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, spray in the middle part of main combustion zone by two-layer tertiary air dense powder spout 7, and it is arranged apart, replace two-layer overfire air port 2 respectively, decrease the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, main combustion zone topmost is sprayed into by two-layer tertiary air light powder spout 8, replace one layer of tertiary air spout 4 and fire air nozzle 5 respectively, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；And change one layer of tertiary air spout 4 into overfire air port 2；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group of three layers high-order over-fire wind snout 6, thus ensureing the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 2
The burner arrangement structure that Fig. 4 provides for the present embodiment.In conjunction with Fig. 2, Fig. 4, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, middle and lower part, main combustion zone is sprayed into by two-layer tertiary air dense powder spout 7, one layer of tertiary air dense powder spout 7 sprays into main combustion zone foot, another layer of tertiary air dense powder spout 7 sprays in the middle part of main combustion zone, replaces two-layer overfire air port 2, decreases the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, main combustion zone topmost is sprayed into by two-layer tertiary air light powder spout 8, replace one layer of tertiary air spout 4 and fire air nozzle 5 respectively, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；And change one layer of tertiary air spout 4 into overfire air port 2；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group of three layers high-order over-fire wind snout 6, thus ensureing 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.In conjunction with Fig. 2, Fig. 5, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, spray in the middle part of main combustion zone by two-layer tertiary air dense powder spout 7, and it is adjacently positioned, replace two-layer overfire air port 2, decrease the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, top, main combustion zone is sprayed into by two-layer tertiary air light powder spout 8, replace one layer of tertiary air spout 4 and fire air nozzle 5 respectively, and interval layout, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；And change one layer of tertiary air spout 4 into overfire air port 2；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by two group of two floor height position fire air nozzle 6, thus ensureing the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 4
The burner arrangement structure that Fig. 6 provides for the present embodiment.In conjunction with Fig. 2, Fig. 6, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, bottom, main combustion zone is sprayed into by one layer of tertiary air dense powder spout 7, replace one layer of overfire air port 2, decrease the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, top, main combustion zone is sprayed into by two-layer tertiary air light powder spout 8, replace one layer of tertiary air spout 4 and fire air nozzle 5 respectively, and interval layout, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；And change one layer of tertiary air spout 4 into overfire air port 2；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group of two floor height position fire air nozzle 6, thus ensureing the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 5
The burner arrangement structure that Fig. 7 provides for the present embodiment.In conjunction with Fig. 2, Fig. 7, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, middle and lower part, main combustion zone is sprayed into by two-layer tertiary air dense powder spout 7, one layer of tertiary air dense powder spout 7 sprays into main combustion zone foot, another layer of tertiary air dense powder spout 7 sprays in the middle part of main combustion zone, replaces two-layer overfire air port 2, decreases the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, top, main combustion zone is sprayed into by one layer of tertiary air light powder spout 8, replace one layer of tertiary air spout 4, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；And change one layer of tertiary air spout 4 into overfire air port 2；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group two layers and one group of one floor height position fire air nozzle 6, thus ensureing 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.In conjunction with Fig. 2, Fig. 8, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, middle and lower part, main combustion zone is sprayed into by one layer of tertiary air dense powder spout 7, replace one layer of overfire air port 2, decrease the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable；The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, top, main combustion zone is sprayed into by three layers tertiary air light powder spout 8, replace two layers of tertiary air spout 4 and fire air nozzle 5 respectively, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group of two floor height position fire air nozzle 6, thus ensureing the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 7
The burner arrangement structure that Fig. 9 provides for the present embodiment.In conjunction with Fig. 2, Fig. 9, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, middle and lower part, main combustion zone is sprayed into by three layers tertiary air dense powder spout 7, one layer of tertiary air dense powder spout 7 sprays into main combustion zone foot, and another two layers of tertiary air dense powder spout 7 spray in the middle part of main combustion zone, and adjacently positioned, replace three layers overfire air port 2, decrease the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, top, main combustion zone is sprayed into by three layers tertiary air light powder spout 8, replace two layers of tertiary air spout 4 and fire air nozzle 5, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group two layers and one group of three layers high-order over-fire wind snout 6, thus ensureing 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.In conjunction with Fig. 2, Figure 10, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, middle and lower part, main combustion zone is sprayed into by two layers of tertiary air dense powder spout 7, and interval layout, replace two layers of overfire air port 2, decrease the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, top, main combustion zone is sprayed into by three layers tertiary air light powder spout 8, replace two layers of tertiary air spout 4 and fire air nozzle 5, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group of three layers high-order over-fire wind snout 6, thus ensureing the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Embodiment 9
The burner arrangement structure that Figure 11 provides for the present embodiment.In conjunction with Fig. 2, Figure 11, the dense powder (accounting for former tertiary air 70% powder amount) that tertiary air is separated, middle and lower part, main combustion zone is sprayed into by three layers tertiary air dense powder spout 7, interval is arranged between two, replace three layers overfire air port 2, decrease the oxygen amount of main combustion zone, make main combustion zone be in oxygen debt reducing atmosphere, be beneficial to burning and produce NOx reduction.Thick coal culm mean diameter 18 μm, as a kind of fine breeze, catches fire rapidly, and gasification is fast, has quick-reaction capability, can form a large amount of reproducibility particle in the short period of time and keep finite concentration, and reduction NOx effect is notable.The light powder (accounting for former tertiary air 30% powder amount) that tertiary air is separated, top, main combustion zone is sprayed into by three layers tertiary air light powder spout 8, replace two layers of tertiary air spout 4 and fire air nozzle 5, spout adopts to have a down dip 5 ° and arranges, it is close to top, main combustion zone, burner and upstream high-temperature flue gas can be improved on the one hand and carry out the condition of convection current radiation heat transfer, strengthen catching fire of fine breeze in light tertiary air, coal dust can be extended at residing time in furnace in order to after-flame on the other hand, thin powdered coal mean diameter 12 μm, can be caught fire rapidly after-flame, so can reduce top, main combustion zone oxygen amount, without causing, coal dust burn-off rate is too low, thus increasing the reduction distance of main combustion zone coal dust；The secondary air flow that main combustion zone is reduced simultaneously, adds to high-order over-fire air, sprays into burning-out zone by one group of four floor height position fire air nozzle 6, thus ensureing the burn-off rate of coal dust in stove, improves Combustion Efficiency of Coal Powder.
Claims (7)
1. the system of a tertiary air air-coal separating reduction emission of NOx of boiler, including feeder (D), coal pulverizer (F), mill separator (G), pulverized-coal collector (H) and tertiary air Powder discharging fan (M), described pulverized-coal collector (H) connects Pulverized Coal Bin (I) and tertiary air Powder discharging fan (M), and Pulverized Coal Bin (I) connects burner hearth by air and powder mixer (J)；
It is characterized in that:
The outlet of described tertiary air Powder discharging fan (M) connects fine coal ring shaped separator (N), fine coal ring shaped separator (N) is provided with the device of the fractional dose for adjusting dense, thin powdered coal, and the outlet section of fine coal ring shaped separator (N) is provided with thick coal culm pipe (P) and thin powdered coal pipe (O)；Thick coal culm pipe (P) connects middle and lower part, at least one of which burner hearth main combustion zone spout, and thin powdered coal pipe (O) connects top, at least one of which burner hearth main combustion zone spout.
2. a kind of tertiary air air-coal separating as claimed in claim 1 reduces the system of emission of NOx of boiler, it is characterised in that: described thick coal culm pipe (P) and thin powdered coal pipe (O) are equipped with adjustable contraction (Q).
3. a kind of tertiary air air-coal separating as claimed in claim 1 reduces the system of emission of NOx of boiler, it is characterised in that: the thin powdered coal nozzle being connected with described thin powdered coal pipe (O) is downward-sloping 5 ° of settings.
4. a kind of tertiary air air-coal separating as claimed in claim 1 reduces the system of emission of NOx of boiler, it is characterized in that: the inducer of fine coal ring shaped separator (N) is provided with the separate blade of the fractional dose for adjusting dense, thin powdered coal, described separate blade is can the separate blade of hand rotation certain angle.
5. a kind of tertiary air air-coal separating as claimed in claim 4 reduces the system of emission of NOx of boiler, it is characterised in that: the angle ranging from ± 10 °.
6. a kind of tertiary air air-coal separating as claimed in claim 1 reduces the system of emission of NOx of boiler, it is characterised in that: the two strands of breeze airflows dense, light after the separation of described powder dense-and-weak separator (N), air quantity ratio is 1: 1, and powder amount ratio is 7: 3.
7. a kind of tertiary air air-coal separating as claimed in claim 1 reduces the system of emission of NOx of boiler, it is characterised in that: the resistance of ducting that described powder dense-and-weak separator (N) increases is less than 1500Pa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521069010.7U CN205372606U (en) | 2015-12-18 | 2015-12-18 | System for deep or light separation of tertiary air reduces boiler NOx and discharges |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521069010.7U CN205372606U (en) | 2015-12-18 | 2015-12-18 | System for deep or light separation of tertiary air reduces boiler NOx and discharges |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509085A (en) * | 2015-12-18 | 2016-04-20 | 上海锅炉厂有限公司 | System and method for reducing boiler NOx emission by tertiary air concentrated-diluted separation |
| CN110394226A (en) * | 2019-07-29 | 2019-11-01 | 沛县祥龙矿山机械配件有限公司 | A kind of flue gas predrying lignite ball mill unit pulverized-coal system |
-
2015
- 2015-12-18 CN CN201521069010.7U patent/CN205372606U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509085A (en) * | 2015-12-18 | 2016-04-20 | 上海锅炉厂有限公司 | System and method for reducing boiler NOx emission by tertiary air concentrated-diluted separation |
| CN110394226A (en) * | 2019-07-29 | 2019-11-01 | 沛县祥龙矿山机械配件有限公司 | A kind of flue gas predrying lignite ball mill unit pulverized-coal system |
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