CN203927901U - The low nitrogen pulverized coal cyclone burner of XC-LNB - Google Patents
The low nitrogen pulverized coal cyclone burner of XC-LNB Download PDFInfo
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- CN203927901U CN203927901U CN201420156136.7U CN201420156136U CN203927901U CN 203927901 U CN203927901 U CN 203927901U CN 201420156136 U CN201420156136 U CN 201420156136U CN 203927901 U CN203927901 U CN 203927901U
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- spout
- pulverized coal
- lnb
- straight length
- burner
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Abstract
The utility model discloses the low nitrogen pulverized coal cyclone burner of a kind of XC-LNB, solved the combustion-delaying that existing pulverized coal cyclone burner exists and bring that fly ash combustible material is higher, component wear serious, the problem of spout slagging scorification and high temperature corrosion.Technical scheme comprises wind passage and a spout thereof and is positioned at secondary air channel and the spout thereof of a wind passage periphery, a described wind passage is made up of bend loss and straight length, the porch of described straight length has undergauge section, in the exit of described straight length, is provided with coal dust classifier.The utility model is simple in structure, efficiency of combustion is high, little, the effective mitigate corrosion of wind passage internal resistance and a wear problem, service life of equipment is long, maintenance cost is low.
Description
Technical field
The utility model relates to a kind of pulverized-coal fired boiler coal dust fired furnace, specifically the low nitrogen pulverized coal cyclone burner of a kind of XC-LNB.
Background technology
Along with the increasingly stringent of country to the control of station boiler discharged nitrous oxides, the combustion system technology of the supporting low-NOx combustor of a kind of full burner hearth air classification is widely applied, and has formed low NOx cyclone and the DC burner technology of various schools.
With regard to the wall formula boiler that liquidates, for nitrogen oxide is effectively reduced in stove, full burner hearth fractional combustion low NOx drainage technology adopts being supplied to the needed whole air of coal dust after-flame (oxygen amount) in stove to be divided into 2 parts, identical with early stage combustion technology, portion of air sprays into burner hearth from lower hearth main burner spout, meets the coal dust requisite oxygen amount of burning in early days; And another part air is from upper furnace air port (after-flame air port) burner hearth of making a gift to someone, make the aerochemistry equivalent proportion in primary zone be less than 1, form the reducing atmosphere of anoxycausis, between primary zone and air port, top (after-flame air port), form reducing atmosphere region, the nitrogen oxide that early stage burning is generated is fully reduced simultaneously.Simultaneously, now turbulent burner itself also all adopts coal powder light-dark to separate and air classification wind pushing form mostly, control wind powder on the mixing opportunity of burner inside, form the reducing atmosphere in burner nozzle region, reach the object of burner region reduction nitrogen oxide.
But, application above-mentioned technology with in meeting national pollution reduction requirement, while being particularly applied to the transformation of former conventional burners, the following problem of ubiquity at present: 1, part air is from after-flame air port is sent into, the air in main burner region is reduced, occur that main burner zonal combustion postpones and brings fly ash combustible material higher.2, for making wind/coal dust mixed airflow produce effective deep or light separation, air channel internal structure more complicated of burner, causes a wind channel system resistance large, channel interior part serious wear, and the operation expense of power plant is high; 3, apply full burner hearth air classification technology, in burner region, aerochemistry equivalent proportion is all less than 1, owing to processing the air force field distribution in bad burner nozzle region, near making spout, water-cooling wall region, simultaneously in reducing atmosphere, easily makes burner nozzle region water-cooling wall produce slagging scorification and high temperature corrosion.
Summary of the invention
The purpose of this utility model is in order to solve the problems of the technologies described above, provide a kind of simple in structure, efficiency of combustion is high, little, effective mitigate corrosion of wind passage internal resistance and wear problem, service life of equipment is long, maintenance cost the is low low nitrogen pulverized coal cyclone burner of XC-LNB.
Technical scheme comprises wind passage and a spout thereof and is positioned at secondary air channel and the spout thereof of a wind passage periphery, a described wind passage is made up of bend loss and straight length, the porch of described straight length has undergauge section, in the exit of described straight length, is provided with coal dust classifier.
Described secondary air channel and spout comprise and are positioned at the inner second air passage of internal layer and spout thereof and are positioned at outer field outer second air passage and spout thereof, the porch of described inner second air passage is provided with axial blade and plug-type secondary air register, the porch of described outer second air passage is provided with tangential vane, and described tangential vane connects adjusting device.
In described outer second air passage, be also provided with burner oil gun conduit, oil fire inspection conduit and coal fire inspection conduit.
The reentrant diameter of described undergauge section and the diameter of straight length ratio are between 0.6-0.75.
The reducing of described undergauge section and the spacing of coal dust classifier are about a 1.2-1.6 wind outlet diameter doubly.
Degree angle≤35 ° at the reamer angle of the spout of a described wind passage and the spout of secondary air channel.
By the undergauge section of the porch design at a wind passage, in the time that a wind/breeze airflow flows through this place, due to the effect of inertia, breeze airflow has just formed dense, light distribution, arrange coal dust classifier in straight length exit, after coal dust classifier, make the breeze airflow of variable concentrations be sprayed into by burner hearth by its spout from center and the surrounding of a wind passage respectively.Technical staff can be for the different fine coal separator of need to designing of Coal rank the distance to the reducing of undergauge section, to reach needed different Pulverized Coal Concentration ratio, preferred distance is a 1.2-1.6 wind outlet diameter doubly, and the dense what is said or talked about that can control coal dust by the ratio of the reentrant diameter of control undergauge section and the maximum gauge of straight length is poor.
Described secondary air channel comprise be positioned at internal layer inner second air passage and be positioned at outer field outer second air passage, inner second air feeder connection place is provided with axial blade, and can regulate the air quantity of inner second air by the plug-type secondary air register of porch; Porch, outer second air road is provided with tangential vane, can carry out by the governor motion being connected with tangential vane the adjusting of the swirl strength of outer second air.By plug-type secondary air register, secondary air flow is regulated, adjusting by adjusting device to tangential vane angle, can obtain at burner center rational high temperature gases recirculating district, and control the in good time mixing of primary and secondary air, make center high concentration pulverized coal quick ignition in high temperature gases recirculating district, burning, consumes rapidly inner oxygen amount, makes burner in anoxycausis nitrogen oxides reduction, reach the object of the efficient after-flame of coal dust in early stage.
Reamer angle≤35 ° of the spout of a described wind passage and the spout of secondary air channel, by controlling rational angle, make the Mixed Delay of primary and secondary air, and make burner nozzle region form the flow field structure of bellows chamber powder, reach the inner oxygen deficient atmospheres that forms of the initial stage of catching fire wind, the nitrogen oxide at initial stage is fully reduced, utilize the brattice that extends out structure formation to reach the object of isolation pulverized coal particle and spout water-cooling wall region tube panel simultaneously, thereby can effectively alleviate the coking of burner region water-cooling wall and high temperature corrosion.
The utility model burner has the feature of efficient and low-nitrogen oxide discharging, the serious wear of low, a simultaneously existing low NO existence of wind passage internal resistance, and the problem of spout slagging scorification and high temperature corrosion, and there is good coal adaptability.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is that the A of Fig. 1 is to view.
Wherein, wind passage of 1-, 1.1-undergauge section, 1.2-coal dust classifier, 1.3-straight length, 1.4-bend loss, 2-inner second air passage, 2.1-axial blade, the plug-type secondary air register of 2.2-, 3-outer second air passage, 3.1-tangential vane, 3.2-adjusting device, wind snout of 4-, 5-burner oil gun conduit, 6-oil fire inspection conduit, 7-coal fire inspection conduit, 8-overfire air port, 8.1-inner second air spout, 8.2-outer second air spout.
Detailed description of the invention
Referring to Fig. 1 and Fig. 2, burner of the present invention comprises a wind passage 1 and a wind snout 4, and be located at secondary air channel 2 and the overfire air port 8 of wind passage 1 periphery, described secondary air channel and overfire air port 2 are by the inner second air passage 2 and the inner second air spout 8.1 that are positioned at internal layer, with be positioned at outer field outer second air passage 3 and outer second air spout 8.2 and form, the porch of described inner second air passage 2 is provided with axial blade 2.1 and plug-type secondary air register 2.2, and the porch of described outer second air passage 3 is provided with the tangential vane 3.1 that connects adjusting device 3.2.A described wind passage 1 is made up of the bend loss 1.4 of back segment and the straight length 1.3 of leading portion, the porch of described straight length 1.3 has undergauge section 1.1, the reentrant diameter M of described undergauge section 1.1 and the diameter L of straight length ratio are between 0.6-0.75, in the exit of described straight length 1.3, be provided with coal dust classifier 1.2, the reducing of described undergauge section 1.1 is apart from a wind outlet diameter of the preferred 1.2-1.6 of spacing times of coal dust classifier 1.2, described burner oil gun conduit 5, oil fire inspection conduit 6, coal fire inspection conduit 7 is all positioned at outer second air passage 3, realize igniting and flame detection through secondary air channel.A described wind snout 4 and overfire air port 8(comprise interior two wind snouts 8.1 and outer second air spout 8.2) reamer angle b all≤35 °, by controlling rational angle, make one, the Mixed Delay of Secondary Air, and make the nozzle area of burner form the flow field structure of bellows chamber powder, reach the inner oxygen deficient atmospheres that forms of the initial stage of catching fire wind, the nitrogen oxide at initial stage is fully reduced, utilize the brattice that extends out structure formation to reach the object of isolating pulverized coal particle and spout water-cooling wall region tube panel simultaneously, thereby can effectively alleviate the coking of burner region water-cooling wall and high temperature corrosion.
Described adjusting device can be pull bar and the drive disk assembly thereof of controlling manually or automatically, be used for driving tangential vane tangentially to rotate respective angles, to realize, the swirl strength of Secondary Air is regulated, above-mentioned adjustment structure and regulative mode are the common technology means of this area, are not described further at this.
Operation principle:
A wind (being breeze airflow) is entered through bend loss 1.4 and is entered straight length 1.3 by a wind passage 1, in the time that undergauge section 1.1 is passed through in the porch of straight length 1.3, due to the effect of inertia, breeze airflow has just formed dense, light distribution, high near coal powder density in the breeze airflow of core, in the air-flow of periphery, coal powder density is low, then further separate through coal dust classifier 1.2 through straight length 1.3, breeze airflow that concentration is high is concentrated to be sprayed by the center of a wind snout 4, the breeze airflow that concentration is low is sprayed by the periphery of a wind snout 4, distance by coal dust classifier 1.2 to the reducing of undergauge section, realize the object of controlling different Pulverized Coal Concentration ratios.Secondary Air (not containing the air-flow of coal dust) is entered by secondary air channel, part finally enters inner second air passage 2 through the plug-type air door 2.2 of inner second air passage 2 porch of internal layer by axial blade 2.1, remainder enters outer second air passage 3 through the tangential vane 3.1 of outer field outer second air passage 3 porch, and spray through inner second air spout 8.1 and outer second air spout 8.2 respectively, because all spouts all have reamer angle, therefore can form the effect of diffusion ejection.Can regulate the air quantity of the Secondary Air that enters axial blade 2.1 by controlling the aperture of plug-type air door 2.2, thereby in regulating, the ratio of outer second air, the tangential angle of the adjustable tangential vane 3.1 of adjusting device 3.2 is for controlling the swirl strength of outer second air, finally realize the mixing opportunity of high temperature gases recirculating district, control combustion device spout center and a Secondary Air, under the prerequisite requiring at the ignition and steady combustion that adapts to Coal rank, make center high concentration pulverized coal quick ignition in high temperature gases recirculating district, burning, consume rapidly inner oxygen amount, make burner in anoxycausis nitrogen oxides reduction, reach the object of the efficient after-flame of coal dust in early stage,
After the oil plant igniting that burner oil gun conduit 5 sprays, make rapidly coal dust catch fire in the effect burning of oxygen, finally sprayed the flame of high-temp combustion by the spout of low nitrogen pulverized coal cyclone burner.
Claims (6)
1. the low nitrogen pulverized coal cyclone burner of XC-LNB, comprise wind passage and spout thereof and be positioned at secondary air channel and the spout thereof of a wind passage periphery, a described wind passage is made up of bend loss and straight length, it is characterized in that, the porch of described straight length has undergauge section, in the exit of described straight length, is provided with coal dust classifier.
2. the low nitrogen pulverized coal cyclone burner of XC-LNB as claimed in claim 1, it is characterized in that, described secondary air channel and spout comprise and are positioned at the inner second air passage of internal layer and spout thereof and are positioned at outer field outer second air passage and spout thereof, the porch of described inner second air passage is provided with axial blade and plug-type secondary air register, the porch of described outer second air passage is provided with tangential vane, and described tangential vane connects adjusting device.
3. the low nitrogen pulverized coal cyclone burner of XC-LNB as claimed in claim 2, is characterized in that, is also provided with burner oil gun conduit, oil fire inspection conduit and coal fire inspection conduit in described outer second air passage.
4. nitrogen pulverized coal cyclone burner as low in XC-LNB as described in claim 1-3 any one, is characterized in that, the reentrant diameter of described undergauge section and the diameter of straight length ratio are between 0.6-0.75.
5. nitrogen pulverized coal cyclone burner as low in XC-LNB as described in claim 1-3 any one, is characterized in that, the reducing of described undergauge section and the spacing of coal dust classifier are a 1.2-1.6 wind outlet diameter doubly.
6. nitrogen pulverized coal cyclone burner as low in XC-LNB as described in claim 1-3 any one, is characterized in that degree angle≤35 ° at the reamer angle of the spout of a described wind passage and the spout of secondary air channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420156136.7U CN203927901U (en) | 2014-04-02 | 2014-04-02 | The low nitrogen pulverized coal cyclone burner of XC-LNB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420156136.7U CN203927901U (en) | 2014-04-02 | 2014-04-02 | The low nitrogen pulverized coal cyclone burner of XC-LNB |
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| CN203927901U true CN203927901U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420156136.7U Expired - Fee Related CN203927901U (en) | 2014-04-02 | 2014-04-02 | The low nitrogen pulverized coal cyclone burner of XC-LNB |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947137A (en) * | 2020-08-27 | 2020-11-17 | 哈尔滨工业大学 | Oil secondary air assisted ignition self-stable combustion W flame boiler and self-stable combustion method |
-
2014
- 2014-04-02 CN CN201420156136.7U patent/CN203927901U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947137A (en) * | 2020-08-27 | 2020-11-17 | 哈尔滨工业大学 | Oil secondary air assisted ignition self-stable combustion W flame boiler and self-stable combustion method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20200402 |
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| CF01 | Termination of patent right due to non-payment of annual fee |