CN107559817A - A kind of swirling pulverized coal combustion device and method using flue gas recirculation - Google Patents
A kind of swirling pulverized coal combustion device and method using flue gas recirculation Download PDFInfo
- Publication number
- CN107559817A CN107559817A CN201710860405.6A CN201710860405A CN107559817A CN 107559817 A CN107559817 A CN 107559817A CN 201710860405 A CN201710860405 A CN 201710860405A CN 107559817 A CN107559817 A CN 107559817A
- Authority
- CN
- China
- Prior art keywords
- air
- flue gas
- eddy flow
- air pipe
- airduct
- Prior art date
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000003546 flue gases Substances 0.000 title claims abstract description 92
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000003245 coal Substances 0.000 title claims abstract description 69
- 238000002485 combustion reactions Methods 0.000 title claims abstract description 25
- 239000003570 air Substances 0.000 claims abstract description 202
- 239000000843 powders Substances 0.000 claims abstract description 31
- 239000002817 coal dust Substances 0.000 claims description 38
- 239000007789 gases Substances 0.000 claims description 24
- 239000007921 sprays Substances 0.000 claims description 9
- 230000003134 recirculating Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000001186 cumulative Effects 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 238000005755 formation reactions Methods 0.000 claims description 3
- 230000002269 spontaneous Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims 1
- 229910002089 NOx Inorganic materials 0.000 abstract description 18
- 238000009841 combustion method Methods 0.000 abstract 1
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Abstract
Description
Technical field
The present invention relates to industrial coal powder boiler technical field, and in particular to a kind of rotational flow coal dust using flue gas recirculation fires Burn device and method.
Background technology
In China, coal-burned industrial boiler is that main in addition to station boiler is equipped with coal, and close to 600,000, year disappears sum Consume nearly 6.4 hundred million tons of coal.The problem of China's coal-burned industrial boiler is primarily present：(1) the actual average thermal efficiency is mostly left 65% The right side, and the thermal efficiency of developed country commonly reaches more than 90%；(2) pollutant emission is exceeded, does not reach country and place generally Discharge standard, annual coal-burned industrial boiler produce about 2,000,000 tons of NOx, and discharge capacity is only second to coal-fired power station boiler.
In recent years, with the continuous maturation of pulverized coal combustion, the horizontal small Industrial Boiler of coal dust burning is in industrial pot Stove field is developed.For this boiler using coal dust as fuel, furnace front sets coal burner, due to using horizontal burner hearth, Architectural limitation, section of burner hearth, the volume of horizontal boiler are all smaller, and the flue gas of eddy flow easily sweeps wall, cause stove internal face slagging Influence operation.Promulgated on May 16th, 2014 in national environmental protection portion《Emission standard of air pollutants for boilers》(GB13271- 2014) clear stipulaties more than 7MW's with coal-fired hot-water boiler from 1 day October in 2015, NOx discharge must not exceed in 400mg/m3；For more than 7MW newly-built coal-fired hot-water boiler from 1 day October in 2015, NOx discharge must not exceed 300mg/ m3；For key area, NOx discharge is even more that must not exceed 200mg/m3.If do not take Mitigation options, it may be difficult to meet day Beneficial harsh environmental requirement.The coal burner for some flue gas recirculations that China uses on industrial furnace at present, such as invent Patent《A kind of vortex burner using flue gas recirculation for Industrial Stoves》(China Patent No. is ZL201010213627.7, data of publication of application are November 3, application publication number CN101876433A in 2010, call " file in the following text One ") annular is provided between First air passage and inner second air passage and between inner second air passage and outer second air passage Outside flue gas recirculation passage, flue gas recycled is sent directly into flue gas recirculation passage；Utility model patent《High-concentration coal Powder mixing injection device》China Patent No. is ZL201320816332.8, authorized announcement date is on July 23rd, 2014, it is public to authorize It number be CN203731464U to accuse, call in the following text " file two ") in coal dust delivery pipe pulverized coal flow concentration be only 1.5~2kg/kg, burn Device exit thick coal culm stream concentration is only 0.8~0.9kg/kg air, and burner Secondary Air is not separated into multistage and fed, once Flue gas recycled is not mixed into wind, Secondary Air.Actual motion shows that " burner that file one " proposes easily causes in burner hearth Slagging, unburned combustible in fly ash rise, and NOx discharge capacity can not be efficiently controlled；" the device after-flame that file two " proposes is poor, NOx abatement effect is poor.
The content of the invention
The present invention enters to solve the problems, such as that existing industrial coal powder boiler NOx discharge is high, slagging is serious and after-flame is poor And propose a kind of swirling pulverized coal combustion device and method using flue gas recirculation.
The present invention adopts the technical scheme that to solve above-mentioned technical problem：
A kind of swirling pulverized coal combustion device using flue gas recirculation is including in primary air piping, direct-current secondary airduct, eddy flow Secondary air channel, eddy flow outer second air pipe, flue gas recycled pipeline and burner hearth, it is primary air piping, direct-current secondary airduct, secondary in eddy flow Airduct and eddy flow outer second air pipe are set gradually from the inside to the outside, and the arrival end of primary air piping and the port of export of pulverized coal channel connect, The port of export of the flue gas recycled pipeline entrance with direct-current secondary airduct, eddy flow inner second air pipe and eddy flow outer second air pipe respectively End connection, primary air piping, direct-current secondary airduct, eddy flow inner second air pipe and eddy flow outer second air pipe the port of export respectively with burning Device spout is connected, and burner nozzle is arranged in burner hearth, and burner nozzle is concordant with inboard wall of burner hearth, is set in eddy flow inner second air pipe There are interior axial swirl blades, outer axial swirl blades are provided with eddy flow outer second air pipe.
It is a kind of to be comprised the following steps using the spiral-flow powdered coal burning method of flue gas recirculation：
Step 1：Flue gas mixes：The boiler tail flue gas that air-introduced machine introduces is respectively fed to direct current by flue gas recycled pipeline In secondary air channel, eddy flow inner second air pipe and eddy flow outer second air pipe, the flue gas recycled and air of introducing are in non-swirl secondary air Each mixing respectively, makes flue gas recycled volume account for flue gas cumulative volume in pipe, eddy flow inner second air pipe and eddy flow outer second air pipe 20%~30%, the coal dust that machine supplying powder is fed mixes with the air that roots blower is fed in air and powder mixer, formed it is highly concentrated Breeze airflow is spent, and is sent into primary air piping；
Step 2：Flow control：High concentration pulverized coal air-flow is sent into burner hearth, primary air piping by primary air piping spontaneous combustion burner center The flow velocity of interior gas is 15~18m/s, uniform mixed gas by direct-current secondary airduct, eddy flow inner second air pipe and eddy flow outside Secondary air channel delivers into burner hearth, and the gas flow in direct-current secondary airduct is sent into burner hearth with 15~18m/s speed, in eddy flow Gas flow in secondary air channel is with 19~21m/s speed, after formation rotating jet in the presence of interior axial swirl blades Burner hearth is sent into, the gas flow in eddy flow outer second air pipe is with 19~21m/s speed, in the presence of outer axial swirl blades Form rotating jet and enter burner hearth；
Step 3：Adjust flue gas ratio：The aperture of each secondary air pipeline valve is adjusted to adjust feeding direct-current secondary Respective air capacity in airduct, eddy flow inner second air pipe and eddy flow outer second air pipe, adjusts each flue gas recycled pipeline valve The flue gas recycled that aperture is sent into direct-current secondary airduct, eddy flow inner second air pipe and eddy flow outer second air pipe with reasonable distribution Ratio；
Step 4：Light：The direct current two sprayed by the high concentration pulverized coal air-flow that primary air piping sprays with direct-current secondary airduct Secondary general mood stream mixes in burner nozzle, and the rotating jet that eddy flow inner second air pipe and eddy flow outer second air pipe spray is in the gas flow Recirculating zone is formed centrally, volume inhales furnace high-temperature flue gas and firing coal-dust airflow.
The beneficial effect that includes compared with prior art of the present invention is：
1st, the present invention is advantageous to more greatly reduce NOx generation amount
1. " burner of file one " between First air passage and inner second air passage and inner second air passage with it is outer Annular outboard flue gas recirculation passage is set between secondary air channel, flue gas recycled is layered entrance with air at burner nozzle In burner hearth, air layer air-flow oxygen concentration is high compared with flue gas recycled layer air-flow concentration, is just well mixed after spraying into the segment distance of burner hearth one, When coal dust enters oxygen content high air layer, NOx discharge increase." file one ", apparatus of the present invention are not separately provided cigarette for contrast Gas recirculation line, flue gas recycled are mixed in each secondary air channel with air, entered at burner nozzle in the absence of stratification of hot gas Enter, both saved flue gas and mixed process of the air in stove, burner outlet region radial direction oxygen concentration is evenly distributed again, protect The stable burning of coal dust has been demonstrate,proved, while has strengthened the reducing atmosphere in primary zone, when extending stop of the coal dust under reducing atmosphere Between, it is suppressed that the NOx discharge of primary combustion zone.Flue gas recycled exists with the mixed gas oxygen concentration of air in the present invention 16% or so, decline about 5% compared to the air oxygen concentration before mixing, enhance the reducing atmosphere in primary zone, effectively drop Low primary zone NOx growing amount.
2. " burner of file one " in First air passage by setting one group of conical ring to concentrate primary wind and powder gas Coal dust in stream, but breeze airflow can not be totally absorbed in burner centre and spray into stove by conical ring Pulverized Coal Concentration ability Thorax, the combustion type of " centre is dense, both sides are light " is can be only formed, and dense, the thin powdered coal stream after concentration are passing through final stage conical ring Occur again afterwards and re-mix, the beneficial effect that coal powder light-dark fractional combustion reduces NOx is not played completely, in addition, logical Breeze airflow in road can also form the conical surface to conical ring and wash away, occur in use because conical ring is worn by coal dust and The situation of burner is changed, operating cost is added, reduces the economic benefit of boiler.Contrast " file one ", apparatus of the present invention High concentration pulverized coal air-flow is conveyed using primary air piping, coal dust is totally absorbed in burner centre and sprays into burner hearth, increases burning The coal powder density of device export center recirculating zone, coal dust is concentrated in Central backflow area reducing atmosphere and burn, extend coal dust Residence time in reducing atmosphere, NOx growing amount is reduce further, and using primary air piping conveying high-concentration coal Powder air-flow reduces the abrasion of breeze airflow, extends the service life of burner.
3. " high concentration pulverized coal stream concentration is only coal dust in every kilogram of air in the described device coal dust delivery pipe of file two " Content is 1.5~2kg, and high concentration pulverized coal stream mixes with First air in primary air piping and is diluted to coal in every kilogram of air The content of powder is 0.8~0.9kg, low into the breeze airflow concentration in burner hearth.Contrast " file two ", in apparatus of the present invention once The content that thick coal culm stream concentration reaches coal dust in every kilogram of air in airduct is 2.3~3.1kg, and in airduct not with Secondary Air Contact and be sent directly into burner hearth, coal dust is totally absorbed in burner centre and sprays into burner hearth, is increased burner outlet center and is returned The coal powder density in area is flowed, coal dust is concentrated in Central backflow area reducing atmosphere and burns, extend coal dust in reducing atmosphere In residence time.
4. " Secondary Air of the described device of file two " is not configured to multistage and fed, and is not carried out air radial grading, no Beneficial to the discharge for reducing NOx." file two ", apparatus of the present invention are provided with direct-current secondary wind pipeline outside primary air piping, rotation for contrast Inside and outside secondary air duct is flowed, using air radial grading combustion technology so that primary zone is in reducing atmosphere, Neng Gou great Amplitude reduction primary zone NOx discharge.
5. " First air, the Secondary Air of the described device of file two " are not mixed into flue gas recycled, oxygen in First air, Secondary Air Concentration is higher, is unfavorable for reducing NOx discharge.Contrast " file two ", direct-current secondary wind pipeline in apparatus of the present invention, in eddy flow, Flue gas recycled is introduced in outer second air pipeline, flue gas recycled is well mixed in above-mentioned each airduct with air, will mixed Flue gas recycled afterwards is sent into burner hearth with air, and uniform, the air flue gas mixing of low oxygen concentration is formd around thick coal culm Air-flow, the speed of combustion reaction progress is slow down, the reducing atmosphere in primary zone is enhanced, significantly reduces primary zone NOx Growing amount.
2nd, the present invention is advantageous to avoid ash erosion
" file one ", the present invention are not separately provided flue gas recycled passage, avoid flue gas recycled and air point for contrast Layer is sent into burner hearth, and in each secondary air channel by evenly mixing, burner outlet region radial direction oxygen is dense for flue gas recycled and air Degree is evenly distributed, and ensure that coal dust is stable and burns, avoids and led because oxygen concentration skewness, subregion ignition temperature are high The slagging of cause.
Contrast " file two ", Secondary Air of the present invention use radial air grading combustion technology, and in the inside and outside Secondary Air of eddy flow Axial swirl blades are respectively provided with pipeline, make the inside and outside Secondary Air rotating jet of eddy flow, the gas being sent into stove is increased and is burning The stream range of device radially, make furnace wall nearby be in oxidizing atmosphere, so as to avoid the high temperature corrosion of water-cooling wall and Because reducing atmosphere makes slagging caused by ash fusion point decline.
3rd, the present invention is advantageous to the after-flame of coal dust
" burner of file one " in First air passage by setting one group of conical ring to concentrate primary wind and powder air-flow In coal dust method, coal dust can not be totally absorbed in burner centre be sent into burner hearth." file one ", the present invention adopt for contrast Coal dust is totally absorbed in burner centre with primary air piping and is sent into burner hearth so that the coal dust sprayed into stove concentrates on high temperature center Recirculating zone, residence time of the coal dust in high temperature recirculation zone is extended, be advantageous to the after-flame of coal dust.
" burner of file two " is not provided with swirl secondary air outside First air, and both no Secondary Air fired to supplement Burn, also no swirling eddy surely fires to roll up suction high-temperature flue gas, unfavorable to the after-flame of coal dust." file two ", the present invention is straight for contrast The inside and outside secondary air duct of eddy flow is provided with outside stream secondary air duct, and axial direction has been installed additional in the inside and outside secondary air duct of eddy flow Swirl vane, the swirling eddy ejected are centrally formed recirculating zone, and Central backflow area volume inhales furnace high-temperature flue gas coal dust Air-flow, be advantageous to breeze airflow catch fire and after-flame.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention, and the wherein direction of hollow arrow represents the side that secondary air flows into To.
Embodiment
Embodiment one：Illustrate present embodiment with reference to Fig. 1, one kind described in present embodiment uses flue gas recirculation Swirling pulverized coal combustion device include primary air piping 1, direct-current secondary airduct 2, eddy flow inner second air pipe 3, eddy flow outer second air pipe 4th, flue gas recycled pipeline 13 and burner hearth 16, primary air piping 1, direct-current secondary airduct 2, eddy flow inner second air pipe 3 and eddy flow outer two Secondary airduct 4 is set gradually from the inside to the outside, and the arrival end of primary air piping 1 is connected with the port of export of pulverized coal channel 18, flue gas recycled The port of export of pipeline 13 connects with the arrival end of direct-current secondary airduct 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 respectively Connect, primary air piping 1, direct-current secondary airduct 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 the port of export respectively with burning Device spout is connected, and burner nozzle is arranged in burner hearth 16, and burner nozzle is concordant with inboard wall of burner hearth 15, eddy flow inner second air pipe Interior axial swirl blades 6 are provided with 3, outer axial swirl blades 5 are provided with eddy flow outer second air pipe 4.
Embodiment two：Illustrate present embodiment with reference to Fig. 1, primary air piping 1, direct-current secondary described in present embodiment Airduct 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 are coaxially disposed.In present embodiment undocumented technical characteristic with Embodiment one is identical.
Embodiment three：Illustrate present embodiment with reference to Fig. 1, flue gas recycled pipeline 13 described in present embodiment Respectively by again between the arrival end of the port of export and direct-current secondary airduct 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 Circulating flue gas branch pipe(tube) 17 connects, and flue gas recycled branch pipe(tube) 17 is provided with flue gas recycled pipeline valve 12.Present embodiment In undocumented technical characteristic it is identical with embodiment one or two.
Embodiment four：Illustrate present embodiment with reference to Fig. 1, flue gas recycled pipeline 13 described in present embodiment Arrival end is provided with air-introduced machine 14.Undocumented technical characteristic is identical with embodiment three in present embodiment.
Embodiment five：Illustrate present embodiment with reference to Fig. 1, direct-current secondary airduct 2, eddy flow described in present embodiment The arrival end of inner second air pipe 3 and eddy flow outer second air pipe 4 is provided with secondary air pipeline valve 11.It is not public in present embodiment The technical characteristic opened is identical with embodiment one, two or four.
Embodiment six：Illustrate present embodiment with reference to Fig. 1, one kind described in present embodiment uses flue gas recirculation Swirling pulverized coal combustion device also include machine supplying powder 7, air and powder mixer 8, roots blower 9 and Pulverized Coal Bin 10, roots blower 9 is set In the arrival end of pulverized coal channel 18, air and powder mixer 8 is arranged on the middle part of pulverized coal channel 18, and Pulverized Coal Bin 10 is arranged on pulverized coal channel 18 top, the lower end of Pulverized Coal Bin 10 are provided with machine supplying powder 7, and the port of export of machine supplying powder 7 is connected with air and powder mixer 8.This embodiment party Undocumented technical characteristic is identical with embodiment five in formula.
Embodiment seven：Illustrate present embodiment with reference to Fig. 1, one kind described in present embodiment uses flue gas recirculation Spiral-flow powdered coal burning method comprise the following steps：
Step 1：Flue gas mixes：The boiler tail flue gas that air-introduced machine 14 introduces is respectively fed to by flue gas recycled pipeline 13 In direct-current secondary airduct 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4, the flue gas recycled and air of introducing are in direct current Each mixing respectively, makes flue gas recycled volume account for cigarette in secondary air channel 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 The 20%~30% of gas cumulative volume, the air that the coal dust that machine supplying powder 7 is fed is fed with roots blower 9 mix in air and powder mixer 8 Close, form high concentration pulverized coal air-flow, and be sent into primary air piping 1；
Step 2：Flow control：High concentration pulverized coal air-flow is sent into burner hearth 16 by the spontaneous combustion burner center of primary air piping 1, once The flow velocity of gas is 15~18m/s in airduct 1, and uniform mixed gas is by direct-current secondary airduct 2, eddy flow inner second air pipe 3 Burner hearth 16 is delivered into eddy flow outer second air pipe 4, and the gas flow in direct-current secondary airduct 2 is sent with 15~18m/s speed Enter burner hearth 16, the gas flow in eddy flow inner second air pipe 3 is with 19~21m/s speed, in the effect of interior axial swirl blades 6 Burner hearth 16 is sent into after lower formation rotating jet, the gas flow in eddy flow outer second air pipe 4 is with 19~21m/s speed, outside Rotating jet is formed in the presence of axial swirl blades 5 and enters burner hearth 16；
Step 3：Adjust flue gas ratio：The aperture for adjusting each secondary air pipeline valve 11 is sent into direct current two to adjust Respective air capacity in secondary airduct 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4, adjusts each flue gas recycled pipeline valve The aperture of door 12 is sent into direct-current secondary airduct 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 again with reasonable distribution The ratio of circulating flue gas；
Step 4：Light：The direct current that the high concentration pulverized coal air-flow sprayed by primary air piping 1 sprays with direct-current secondary airduct 2 Secondary Air air-flow mixes in burner nozzle, and the rotating jet that eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 spray is in gas Flow center forms recirculating zone, and volume inhales furnace high-temperature flue gas and firing coal-dust airflow.
Embodiment eight：Illustrate present embodiment with reference to Fig. 1, step 1 middle and high concentration coal dust described in present embodiment Coal dust and the mass ratio shared by air are 2.3~3.1 in air-flow:1.Undocumented technical characteristic and specific reality in present embodiment It is identical to apply mode seven.The content of coal dust is 2.3~3.1kg in every kilogram of air i.e. in high concentration pulverized coal air-flow.
Claims (8)
- A kind of 1. swirling pulverized coal combustion device using flue gas recirculation, it is characterised in that：Described one kind uses flue gas recirculation Swirling pulverized coal combustion device include primary air piping (1), direct-current secondary airduct (2), eddy flow inner second air pipe (3), eddy flow outer two Secondary airduct (4), flue gas recycled pipeline (13) and burner hearth (16), it is primary air piping (1), direct-current secondary airduct (2), secondary in eddy flow Airduct (3) and eddy flow outer second air pipe (4) are set gradually from the inside to the outside, arrival end and the pulverized coal channel (18) of primary air piping (1) Port of export connection, the port of export of flue gas recycled pipeline (13) respectively with direct-current secondary airduct (2), eddy flow inner second air pipe (3) arrival end with eddy flow outer second air pipe (4) connects, primary air piping (1), direct-current secondary airduct (2), eddy flow inner second air pipe (3) it is connected respectively with burner nozzle with the port of export of eddy flow outer second air pipe (4), burner nozzle is arranged on burner hearth (16) Interior, burner nozzle is concordant with inboard wall of burner hearth (15), and interior axial swirl blades (6), eddy flow are provided with eddy flow inner second air pipe (3) Outer axial swirl blades (5) are provided with outer second air pipe (4).
- A kind of 2. swirling pulverized coal combustion device using flue gas recirculation according to claim 1, it is characterised in that：Described one Secondary airduct (1), direct-current secondary airduct (2), eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4) are coaxially disposed.
- A kind of 3. swirling pulverized coal combustion device using flue gas recirculation according to claim 1 or claim 2, it is characterised in that：Institute State the port of export and direct-current secondary airduct (2), eddy flow inner second air pipe (3) and eddy flow outer second air of flue gas recycled pipeline (13) Connected respectively by flue gas recycled branch pipe(tube) (17) between the arrival end of pipe (4), flue gas recycled branch pipe(tube) (17) is provided with Flue gas recycled pipeline valve (12).
- A kind of 4. swirling pulverized coal combustion device using flue gas recirculation according to claim 3, it is characterised in that：It is described again The arrival end of circulating flue gas pipeline (13) is provided with air-introduced machine (14).
- 5. according to a kind of swirling pulverized coal combustion device using flue gas recirculation of claim 1,2 or 4, it is characterised in that： It is empty that the arrival end of the direct-current secondary airduct (2), eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4) is provided with Secondary Air Feed channel valve (11).
- A kind of 6. swirling pulverized coal combustion device using flue gas recirculation according to claim 5, it is characterised in that：Described one Kind using flue gas recirculation swirling pulverized coal combustion device also include machine supplying powder (7), air and powder mixer (8), roots blower (9) and Pulverized Coal Bin (10), roots blower (9) are arranged on the arrival end of pulverized coal channel (18), and air and powder mixer (8) is arranged on pulverized coal channel (18) middle part, Pulverized Coal Bin (10) are arranged on the top of pulverized coal channel (18), and the lower end of Pulverized Coal Bin (10) is provided with machine supplying powder (7), The port of export of machine supplying powder (7) is connected with air and powder mixer (8).
- A kind of 7. spiral-flow powdered coal burning method using flue gas recirculation, it is characterised in that：Methods described comprises the following steps：Step 1：Flue gas mixes：The boiler tail flue gas that air-introduced machine (14) introduces is respectively fed to by flue gas recycled pipeline (13) In direct-current secondary airduct (2), eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4), the flue gas recycled and air of introducing Each mixing respectively, makes recycling in direct-current secondary airduct (2), eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4) Flue gas volume accounts for the 20%~30% of flue gas cumulative volume, and the coal dust that machine supplying powder (7) is fed exists with the air that roots blower (9) is fed Mixed in air and powder mixer (8), form high concentration pulverized coal air-flow, and be sent into primary air piping (1)；Step 2：Flow control：High concentration pulverized coal air-flow is sent into burner hearth (16) by primary air piping (1) spontaneous combustion burner center, once The flow velocity of airduct (1) interior gas is 15~18m/s, and uniform mixed gas is by direct-current secondary airduct (2), eddy flow inner second air Pipe (3) and eddy flow outer second air pipe (4) deliver into burner hearth (16), the gas flow in direct-current secondary airduct (2) with 15~ 18m/s speed is sent into burner hearth (16), and the gas flow in eddy flow inner second air pipe (3) is with 19~21m/s speed, in interior axle Burner hearth (16) is sent into after rotating jet is formed in the presence of to swirl vane (6), the gas flow in eddy flow outer second air pipe (4) With 19~21m/s speed, formation rotating jet enters burner hearth (16) in the presence of outer axial swirl blades (5)；Step 3：Adjust flue gas ratio：The aperture of each secondary air pipeline valve (11) is adjusted to adjust feeding direct-current secondary Respective air capacity in airduct (2), eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4), adjusts each flue gas recycled pipe The aperture of road valve (12) is sent into direct-current secondary airduct (2), eddy flow inner second air pipe (3) and eddy flow outer second air with reasonable distribution Manage the ratio of the flue gas recycled in (4)；Step 4：Light：The direct current sprayed by the high concentration pulverized coal air-flow that primary air piping (1) sprays with direct-current secondary airduct (2) Secondary Air air-flow mixes in burner nozzle, the rotating jet that eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4) spray Recirculating zone is formed centrally in the gas flow, and volume inhales furnace high-temperature flue gas and firing coal-dust airflow.
- A kind of 8. spiral-flow powdered coal burning method using flue gas recirculation according to claim 7, it is characterised in that：The step Coal dust and the mass ratio shared by air are 2.3~3.1 in rapid middle and high concentration breeze airflow:1.
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| CN109654485A (en) * | 2018-12-18 | 2019-04-19 | 哈尔滨工业大学 | A kind of swirling pulverized coal combustion device using flue gas recirculation and precombustion chamber |
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| CN107559817B (en) | 2019-12-31 |
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