CN101995015A - Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner - Google Patents
Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner Download PDFInfo
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- CN101995015A CN101995015A CN200910184669XA CN200910184669A CN101995015A CN 101995015 A CN101995015 A CN 101995015A CN 200910184669X A CN200910184669X A CN 200910184669XA CN 200910184669 A CN200910184669 A CN 200910184669A CN 101995015 A CN101995015 A CN 101995015A
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Abstract
The invention provides a low Nox (Nitrogen Oxide) combustion technology of the air classification of a main combustion area of direct-current four-corner circle-cutting combustion. A combustion system arranged in a hearth (1) respectively comprises primary and secondary air nozzles (2) and a burnout air nozzle (3), wherein the primary air nozzles and the secondary air nozzles are arranged at intervals and are divided into upper and lower two groups or more than two groups, each group carries out unequal air distribution and is provided with a bottom secondary air nozzle and a top secondary air nozzle arranged respectively on the lower part and the upper part, the air quantities of the bottom secondary air nozzle and the top secondary air nozzle are both far greater than the air quantity of a middle secondary air nozzle, the nozzles are arranged at the four corners of the hearth, and a circle-cutting combustion mode is formed in the hearth. The invention has the advantages that the mixing of coal dust and air is controlled from a primary combustion area, that is to say, the mixing of coal dust and air is controlled as long as the coal dust begins to burn, thereby effectively controlling Nox generation, meanwhile, a strengthened combustion measure is adopted to realize the high-efficiency combustion of the coal dust and effectively reduce smoke exhaust loss, and meanwhile, an oxidative atmosphere is formed on a water cooling wall area to effectively prevent high temperature corrosion and slagging in the furnace.
Description
Technical field:
The present invention relates to the low Nox combustion technology of coal-burning boiler, particularly relate to a kind of low Nox combustion technology of quadrangle tangential circle that is applied in DC burner.
Background technology:
Nitrogen oxide (Nox) is the major pollutants that cause atmosphere pollution, and it removes and forms acid rain, destroys ecological environment, can also form photochemical fog, be detrimental to health, and coal-burning power plant's coal burning is one of main source of Nox generation.By new GB 13223-2003 " thermal power plant's atmosphere pollutants emission standards ", require coal-burning boiler from January 1st, 2004, need satisfy Vdaf＞20%, its Nox＜450mg/Nm3,10%＜Vdaf＜20%, its Nox＜650mg/Nm3, Vdaf＜10%, its Nox＜1100mg/Nm3; And under concentration of emission prerequisite up to standard, to charge,, have tangible economic advantages for the operating cost that alleviates denitrification apparatus so reduce the Nox amount that produces when burning as far as possible to the Nox total emission volumn.
Traditional straight flow combustion technology otherwise catch fire fast, high-temp combustion to be to reach the purpose of abundant after-flame; The method that adopts the postponement of fuel and combustion air to mix reduces the purpose that NOX produces to reach.Yet this two classes Burner Technology has its tangible drawback, and the former can produce a large amount of NOX, and is easy to produce ash erosion and high temperature corrosion, and the latter can make efficiency of combustion reduce.The low NOx technology of present straight flow combustion has adopted the air classification technology, and combustion process is divided into 3 zones (combustion zone, NOx reducing zone, burning-out zone) or Xin San district (being the smooth combustion district, degree of depth low oxygen combustion and reducing zone, burning-out zone).Air classification technology in the present low NOx technology is implemented behind the primary zone of coal dust often, does not begin to carry out the classification of air from the burning initial stage, and the serious like this effect that limits air classification is the obvious defects or the deficiency of its technology.
Therefore, the low Nox draining technology of air classification burning is promptly carried out in research from the coal powder ignition initial stage, the maximization air classification reduces the ability of NOx, and strengthen catch fire and the straight flow combustion technology of low-load combustion-stabilizing performance to realizing the harmonious development of China's economy, it is significant to create conservation-minded society.
Summary of the invention:
Defective or deficiency at above-mentioned technology existence, the invention provides a kind of low Nox combustion technology of direct current corner tangential firing, horizontal bias is set separates coal burner, by being divided into groups and the coal powder light-dark segregated combustion in the primary zone, air distribution as required in good time,, fractional combustion, the purpose that reaches low Nox discharging and efficient burning and effectively prevent stove internal corrosion and slagging scorification.
In order to maximize the ability that air classification reduces NOx, the present invention is achieved by following technical proposals: the quadrangle tangential circle of DC burner hangs down the Nox combustion technology, combustion system in the burner hearth (1) is made up of wind and overfire air port (2), after-flame wind snout (3) respectively, it is characterized in that: wherein wind snout and overfire air port are for arranging at interval, air-supply in good time, wind and overfire air port are divided into up and down two groups or more, effectively the oxygen amount at each angle is even in the control tangential firing stove, and every group all is furnished with end secondary wind and top secondary wind up and down; Because the arrangement of spout, the stove internal combustion is divided into 3 zones: primary zone (4) (comprising primary zone I, primary zone II or primary zone III etc.), reducing zone (5), burning-out zone (6); The institute of primary zone, burning-out zone is wind snout once, and overfire air port, split after-flame wind snout are arranged on four angles of quadrangle tangential circle boiler; The spout arrangement form in every group of primary zone is 2 layers or 3 layers of wind, and secondary wind is arranged between wind, and every group all be furnished with end secondary wind and top secondary wind up and down, adopts 2/1/2/1/2 or 2/1/2/1/2/1/2 form; The overfire air port in every group of primary zone adopts unequal air distribution to arrange, in the secondary elegance of the centre form with impartial air distribution, end secondary wind and top secondary wind air quantity, wind speed are all greater than intermediate layer secondary wind; A wind snout left and right sides of every group of burner all is furnished with the air port of auxiliary combustion, and wind snout and auxiliary wind snout all have certain flow angle; Overfire air port makes spout water-cooling wall zone that sufficient oxygen amount be arranged for extending out formula spout structure (7), forms selective oxidation atmosphere, effectively prevents the slagging scorification and the high temperature corrosion in water-cooling wall zone in the stove; After-flame wind snout (3) circle of contact rotation direction is opposite with primary zone circle of contact rotation direction, effectively prevents furnace roof cigarette temperature deviation, after-flame wind snout (3) but vertical oscillation is regulated after-flame distance and outlet cigarette temperature.
Beneficial effect of the present invention:
1, proposed a kind of in tangentially-fired boiler the breeze airflow initial stage of catching fire just carry out air classification, control breeze airflow and Air mixing in combustion process carried out in real time, the low NOx combusting technology of air distribution as required.By postponing breeze airflow and Air mixing, make the easier anoxic zones that forms in the part of breeze airflow, help forming reducing atmosphere, reduce NOx simultaneously, catch fire by reinforcement, offset the negative effect that the delay of coal dust and air mixes, made low NOx and efficient burning realize the unification of technology path.
2, the overfire air port with primary zone grouping and every group of primary zone adopts unequal air distribution to arrange, in the secondary elegance of the centre form with impartial air distribution, end secondary wind and top secondary wind air quantity, wind speed are all greater than intermediate layer secondary wind, generally greater than more than 1 times.By this arrangement, make breeze airflow be lower than bottom and top in the oxygen amount in the middle of every group, help in the middle of every group, forming reducing atmosphere, realized the function that the breeze airflow initial stage of catching fire in the primary zone is promptly carried out the reduction of NOx.Every group of bottom secondary air flow can make greater than the centre that breeze airflow is easier by bottom secondary wind holder, burns with breeze airflow, reduce coal dust and fall into the possibility of burner hearth bottom, improved efficiency of combustion, simultaneously, this part wind is progressively sneaked in the air-flow that catches fire with swirling eddy, in good time air distribution.Top secondary wind is equivalent to this group burner is formed after-flame wind, has played the technology that realizes whole classification in the primary zone.
3, for realize in good time, air distribution as required, unique lip jet structure has been adopted in overheavy firing, the present invention.Make the wind snout breeze airflow one time, a wind snout surrounding air, the overfire air port air-flow all has certain angle, and realization secondary wind is progressively sneaked in the breeze airflow that catches fire, and this mode helps catching fire of breeze airflow owing to postponed Air mixing on the one hand; Spout structure helps forming the backflow of hot flue gas simultaneously, and breeze airflow is also caught fire easily.The consumption of oxygen has been accelerated in the reinforcement of catching fire, and the reproducibility zone is enlarged, and is more conducive to the reduction of NOx.
4, be the effect of better bringing into play air classification, also be provided with split type after-flame wind system above the primary zone, being formed in theory, primary zone integral body is in anaerobic condition.The after-flame wind snout is opposite with primary zone spout circle of contact direction, balanced furnace outlet gas temperature, and the after-flame wind snout also can vertical oscillation ± 30 °, effectively regulate burning-out zone height and furnace outlet gas temperature.The spout of split type after-flame wind adopts single channel or channel structure.In the channel structure, internal channel is a high speed direct current wind, and outer tunnel is furnished with fixed swirling flow blade, forms swirling eddy.Direct current wind reaches the burner hearth center easily, and swirling flow wind forms oxidizing atmosphere at the burner hearth wall easily, effectively prevents slagging scorification and high temperature corrosion.
5, owing to adopted the overheavy firing technology, unique primary zone spout is arranged and version, makes the furnace outlet excess air coefficient of present technique be lower than conventional tangentially-fired boiler.Usually when using bituminous coal, can control furnace outlet oxygen amount 1.14-1.2, primary zone oxygen amount is controlled at 0.75-0.9.
6, primary zone, burning-out zone wind snout, overfire air ports etc. are by the difference of flow angle, in stove, can make up by the different circle of contacts, in burner hearth, form the tangential firing of different-diameter, be implemented in the interior coal dust of section of burner hearth scope and the even distribution of air, improve efficiency of combustion, reduce NOx.
Description of drawings:
Fig. 1 is a low Nox combustion technology system architecture schematic diagram of the present invention
Fig. 2 is that the A-A of Fig. 1 is to view
Fig. 3 is B portion partial view among Fig. 1 (the single group in primary zone is arranged by 2/1/2/1/2/1/2)
Fig. 4 is B portion partial view among Fig. 1 (the single group in primary zone is arranged by 2/1/2/1/2)
Fig. 5 is that B is to the C-C of view view
Fig. 6 is that B is to the D-D of view view
1. 2. wind of burner hearth and overfire air port 3. after-flame wind snouts 4. primary zones
5. reducing zone 6. burning-out zones 7. extend out formula spout structure 8. top overfire air ports
9. middle overfire air port 10. end overfire air port 11. surrounding airs
The specific embodiment: consult Fig. 1, combustion system in the burner hearth (1) is made up of wind and overfire air port (2), after-flame wind snout (3) respectively, wherein wind snout and overfire air port are to arrange at interval, wind and overfire air port are divided into two groups up and down, every group all is furnished with end secondary wind and top secondary wind up and down, each spout is arranged in four jiaos in burner hearth, forms the tangential firing mode in the burner hearth.Because the arrangement of spout, the stove internal combustion is divided into 3 zones: primary zone (4) (comprising primary zone I, primary zone II, primary zone III etc.), reducing zone (5) and burning-out zone (6).Wind snout and overfire air port are and extend out formula spout structure (7), can effectively prevent furnace high-temperature corrosion and slagging scorification.After-flame wind snout (3) circle of contact rotation direction is opposite with primary zone circle of contact rotation direction, effectively prevents furnace roof cigarette temperature deviation.After-flame wind snout (3) but vertical oscillation is regulated after-flame distance and outlet cigarette temperature.
Exemplify the method for several enforcements below:
Embodiment 1
The combustion system of whole burner hearth is divided into three combustion zones: primary zone (4) (comprise primary zone I, primary zone II, primary zone III etc.), Nox reducing zone (5) and burning-out zone (6), by control furnace outlet oxygen amount 1.14-1.2, primary zone oxygen amount is controlled at 0.75-0.9, in stove, realize the combustion system staged air distribution, the primary zone is an anoxycausis, limited the oxidation of fuel bound nitrogen, limited the temperature in primary zone simultaneously, controlled the generation of high temperature modification Nox, in the reducing zone, the a large amount of reductants that generate can carry out reduction reaction with the Nox that has generated, and further reduce Nox.In burning-out zone postcombustion after-flame requisite oxygen amount.Simultaneously divide into groups in the primary zone, and the overfire air port in every group of primary zone adopts unequal air distribution to arrange, in the secondary elegance of the centre form with impartial air distribution, end secondary wind and top secondary wind air quantity, wind speed are all greater than intermediate layer secondary wind.By this arrangement, make breeze airflow be lower than bottom and top in the oxygen amount in the middle of every group, help in the middle of every group, forming reducing atmosphere, realized the function that the breeze airflow initial stage of catching fire in the primary zone is promptly carried out the reduction of NOx.
The primary zone spout is divided into up and down two groups or more, efficient balance each angle oxygen amount in the stove, prevent eccentricity of fire and whitewash a wall, wind snout and overfire air port are and extend out formula structure (7), participate in Fig. 2, when the burning required air is provided, form oxidizing atmosphere in spout water-cooling wall zone, effectively prevent slagging scorification and high temperature corrosion.Each surrounding air and secondary wind can be according to the ature of coal clinkering properties, and situations such as combustibility utilize damper to adjust the air quantity size, and commute slagging scorification, easy steady coal-fired matter can strengthen secondary air flow, otherwise reduce secondary air flow.
Embodiment 3
In stove the primary zone above suitably distance arrange the after-flame wind snout, the after-flame wind snout is evenly arranged in interior four jiaos of stove, wind of after-flame wind imaginary circle rotation direction in stove and primary zone, secondary wind rotation direction are opposite, can effectively weaken the flue gas swirl strength of furnace outlet, make whole section of burner hearth cigarette temperature more even.But ± 30 ° of after-flame wind snout vertical direction swings, the height of adjusting furnace outlet gas temperature and burning-out zone.When higher or ature of coal is changed to more difficult after-flame when outlet cigarette temperature, but the spout bottom one angle makes under the flame kernel inclined to one side, increased the burning-out zone height simultaneously, when on the low side or ature of coal was than easy to burn out when furnace outlet gas temperature, spout can be gone up pendulum one angle, make on the flame kernel partially, reduced the burning-out zone height simultaneously.
Claims (5)
1. the low Nox combustion technology of the quadrangle tangential circle of DC burner is characterized in that: at wind snout of four jiaos of arranging multiplayers of burner hearth and overfire air port (2), arrange after-flame wind snout (3) above burner hearth;
2. combustion technology as claimed in claim 1 is characterized in that: in whole stove, form 3 combustion phases, i.e. primary zone (4), and reducing zone (5), burning-out zone (6), control furnace outlet oxygen amount 1.14-1.2, primary zone oxygen amount is controlled at 0.75-0.9;
3. low Nox combustion technology as claimed in claim 1, it is characterized in that: adopt unequal air distribution to arrange the overfire air port in primary zone grouping and every group of primary zone, in the secondary elegance of centre form with impartial air distribution, end secondary wind and top secondary wind air quantity, wind speed are all greater than intermediate layer secondary wind, generally greater than more than 1 times;
4. a wind snout as claimed in claim 3 and overfire air port is characterized in that: wind snout adopts horizontal bias segregated combustion mode, and wind, overfire air port are for extending out formula spout structure (7), and extending out angle [alpha] is 20 °-60 °;
5. as claim 1,2 described low Nox combustion technologies, it is characterized in that: wind snout of after-flame wind snout and below that the burner hearth top is arranged is opposite with overfire air port circle of contact direction, and can swing in vertical direction, and pivot angle is ± 30 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910184669XA CN101995015A (en) | 2009-08-14 | 2009-08-14 | Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner |
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| CN200910184669XA CN101995015A (en) | 2009-08-14 | 2009-08-14 | Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner |
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| CN104214794A (en) * | 2014-08-05 | 2014-12-17 | 广东省粤电集团有限公司珠海发电厂 | Upward swinging angle determination method of combustor spray nozzle of pulverized coal boiler and combustion control method |
| CN105937772A (en) * | 2016-04-01 | 2016-09-14 | 青岛瑞亨蓝天节能环保工程有限公司 | Lateral fully-covering combustion system under dimensional air combustion technology |
| CN106152502A (en) * | 2015-04-16 | 2016-11-23 | 上海工业锅炉有限公司 | A kind of efficiently direct fired heated air boiler |
| CN109028039A (en) * | 2018-08-01 | 2018-12-18 | 哈尔滨锅炉厂有限责任公司 | Coal dust depth concentration device and combustion method |
| CN109140428A (en) * | 2017-06-14 | 2019-01-04 | 山西三合盛节能环保技术股份有限公司 | A kind of circle of contact pulverized coal decoupling combustor group, burner and combustion method |
| CN109340810A (en) * | 2018-11-22 | 2019-02-15 | 西安交通大学 | A kind of secondary air distribution structure reducing layer burner unburned carbon in flue dust |
| CN109595586A (en) * | 2018-11-29 | 2019-04-09 | 华中科技大学 | The burning optimization method and system of anti-high-temperature corrosion in boiler based on CO on-line checking |
| CN109681861A (en) * | 2019-02-19 | 2019-04-26 | 上海华之邦科技股份有限公司 | A kind of structurally reasonable type gas fired-boiler high efficency low NOx combustion system |
| CN109737389A (en) * | 2019-02-27 | 2019-05-10 | 哈尔滨锅炉厂有限责任公司 | A kind of quasi- eastern coal low-temperature burning control system |
| CN111550820A (en) * | 2020-05-25 | 2020-08-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Boiler over-fire air adjusting method based on power moment |
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- 2009-08-14 CN CN200910184669XA patent/CN101995015A/en active Pending
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| CN104214794A (en) * | 2014-08-05 | 2014-12-17 | 广东省粤电集团有限公司珠海发电厂 | Upward swinging angle determination method of combustor spray nozzle of pulverized coal boiler and combustion control method |
| CN104214794B (en) * | 2014-08-05 | 2016-08-17 | 广东省粤电集团有限公司珠海发电厂 | On coal powder fired boiler burner nozzle, pivot angle angle value determines method and method for controlling combustion |
| CN106152502A (en) * | 2015-04-16 | 2016-11-23 | 上海工业锅炉有限公司 | A kind of efficiently direct fired heated air boiler |
| CN105937772A (en) * | 2016-04-01 | 2016-09-14 | 青岛瑞亨蓝天节能环保工程有限公司 | Lateral fully-covering combustion system under dimensional air combustion technology |
| CN105937772B (en) * | 2016-04-01 | 2018-04-06 | 青岛瑞亨蓝天节能环保工程有限公司 | Lateral all standing combustion system under air stereo burning technology |
| CN109140428A (en) * | 2017-06-14 | 2019-01-04 | 山西三合盛节能环保技术股份有限公司 | A kind of circle of contact pulverized coal decoupling combustor group, burner and combustion method |
| CN109140428B (en) * | 2017-06-14 | 2024-03-26 | 山西三合盛智慧科技股份有限公司 | Tangential coal dust decoupling burner set, combustion device and combustion method |
| CN109028039A (en) * | 2018-08-01 | 2018-12-18 | 哈尔滨锅炉厂有限责任公司 | Coal dust depth concentration device and combustion method |
| CN109028039B (en) * | 2018-08-01 | 2019-09-13 | 哈尔滨锅炉厂有限责任公司 | Coal dust depth concentration device and combustion method |
| CN109340810A (en) * | 2018-11-22 | 2019-02-15 | 西安交通大学 | A kind of secondary air distribution structure reducing layer burner unburned carbon in flue dust |
| CN109595586A (en) * | 2018-11-29 | 2019-04-09 | 华中科技大学 | The burning optimization method and system of anti-high-temperature corrosion in boiler based on CO on-line checking |
| CN109595586B (en) * | 2018-11-29 | 2021-02-19 | 华中科技大学 | Combustion optimization method and system for preventing high-temperature corrosion of boiler based on CO online detection |
| CN109681861A (en) * | 2019-02-19 | 2019-04-26 | 上海华之邦科技股份有限公司 | A kind of structurally reasonable type gas fired-boiler high efficency low NOx combustion system |
| CN109737389A (en) * | 2019-02-27 | 2019-05-10 | 哈尔滨锅炉厂有限责任公司 | A kind of quasi- eastern coal low-temperature burning control system |
| CN111550820A (en) * | 2020-05-25 | 2020-08-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Boiler over-fire air adjusting method based on power moment |
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Application publication date: 20110330 |