CN100455885C - A method for combustion of low nitrogen oxides in coal-fired boilers - Google Patents
A method for combustion of low nitrogen oxides in coal-fired boilers Download PDFInfo
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- CN100455885C CN100455885C CNB2007100718163A CN200710071816A CN100455885C CN 100455885 C CN100455885 C CN 100455885C CN B2007100718163 A CNB2007100718163 A CN B2007100718163A CN 200710071816 A CN200710071816 A CN 200710071816A CN 100455885 C CN100455885 C CN 100455885C
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Abstract
一种用于燃煤锅炉中低氮氧化物燃烧的方法，本发明涉及一种低氮氧化物燃烧的方法。它为了解决应用煤粉再燃技术再燃区不易形成稳定的还原气氛，氮氧化物还原率较低，同时主燃区和再燃区易发生结渣和高温腐蚀的问题。用于燃煤锅炉中低氮氧化物燃烧的方法通过以下步骤实现：(一)主燃区常规粒度煤粉以水平浓淡风技术燃烧；(二)细化煤粉作为再燃燃料以浓淡燃烧技术燃烧，再燃燃料燃烧形成还原气氛的再燃区，主燃区的烟气通过再燃区时烟气中的氮氧化物被还原；(三)再燃区的上方喷入燃尽风，形成燃尽区，再燃区出口的未完全燃烧产物通过燃尽区时进一步燃尽。本发明可使普通燃煤锅炉降低氮氧化物排放50%～65%，明显改善锅炉发生高温腐蚀和结渣现象。
The invention relates to a low-nitrogen oxide combustion method in a coal-fired boiler, and the invention relates to a low-nitrogen oxide combustion method. It solves the problem that it is difficult to form a stable reducing atmosphere in the reburning area of the pulverized coal reburning technology, the reduction rate of nitrogen oxides is low, and at the same time, the main combustion area and the reburning area are prone to slagging and high-temperature corrosion. The method for combustion of low nitrogen oxides in coal-fired boilers is achieved through the following steps: (1) Combustion of conventional particle size coal powder in the main combustion zone with horizontal dense-lean air technology; (2) Combustion of refined coal powder as reburning fuel with dense-lean combustion technology , the reburning fuel burns to form a reburning zone with a reducing atmosphere, and the nitrogen oxides in the flue gas are reduced when the flue gas in the main combustion zone passes through the reburning zone; The incomplete combustion products at the outlet of the zone are further burnt out when passing through the burnout zone. The invention can reduce the emission of nitrogen oxides by 50% to 65% in ordinary coal-fired boilers, and obviously improve the phenomenon of high-temperature corrosion and slagging of boilers.
Description
Technical field
The present invention relates to a kind of method of low nitrogen oxide burning.
Background technology
The nitrogen oxide that coal dust firing produces is one of primary pollution source of atmosphere pollution, and it destroys ecological environment except forming acid rain, can also form photochemical fog, harm humans health.Coal powder recombustion low nitrogen oxide burning technology is the measure of the reduction nitrogen oxide of a kind of high nitric efficiency, low investment, low operating cost, the key of coal powder recombustion low nitrogen oxide burning technology is the reburning zone that forms reducing atmosphere, but the power coal ature of coal of China is generally relatively poor, with coal dust as reburning fuel, the reburning zone is difficult to form stablizes reducing atmosphere, and the nitrogen oxide percent reduction is lower; The after-flame of coal-fired powder is also relatively poor again; Adopt coal dust combustion technology again, the excess air coefficient in the primary zone of boiler is lower than conventional boiler, and the reburning zone is a reducing atmosphere, easily high temperature corrosion and slagging scorification; These problems have limited the coal dust application of combustion technology again.
Summary of the invention
The present invention uses the coal dust stable reducing atmosphere of the difficult formation in combustion technology reburning zone again in order to solve, and the nitrogen oxide percent reduction is lower, and the problem of slagging scorification and high temperature corrosion easily takes place for primary zone and reburning zone simultaneously.A kind of method that is used for the coal-burning boiler low nitrogen oxide burning is provided, the method that is used for the coal-burning boiler low nitrogen oxide burning realizes by following steps: the regular particle size coal dust that () will account for boiler oil caloric value 80%～85% is sent into the primary zone of boiler furnace bottom, at excess air coefficient is to burn with horizontal bias wind combustion technology under 0.8～1 the condition; (2) utilizing air, flue gas or flue gas and AIR MIXTURES is that 20～60 microns the boiler oil caloric value that accounts for is that 15%～20% coal dust is sprayed into by the top, primary zone as reburning fuel with particle mean size, form the reburning zone, the excess air coefficient of reburning zone outlet is controlled to be 0.85～0.95, reburning zone gas residence time 0.2 second～0.8 second, reburning fuel burns with horizontal bias combustion technology or straight flow combustion mode; (3) spray into after-flame wind to the top of reburning zone, form burning-out zone and burning-out zone is exported excess air coefficient and be controlled to be 1.15～1.2, the imperfect combustion product of reburning zone outlet can reach the purpose of low nitrogen oxide burning in the coal-burning boiler at the further after-flame of burning-out zone.The method that is used for the coal-burning boiler low nitrogen oxide burning among the present invention is a reburning fuel with the coal dust, is convenient to fire the low nitrogen oxide burning The Application of Technology again.The present invention will be more coal-fired powder carry out thinning processing, improve the reactivity of coal dust, help again catching fire and after-flame of coal-fired powder, help the reburning zone and form stable reducing atmosphere and reduce the nitrogen oxide that the primary zone generates.The coal tar surface area that its reaction generates after the coal-fired again powder refinement increases, and the ability of nitrogen oxides reduction also is improved, and helps the reduction of nitrogen oxide.Reburning fuel adopts the horizontal bias combustion technology, adopting the horizontal bias combustion technology to help reburning fuel surely fires, the horizontal bias combustion technology has postponed coal-fired powder again and has carried coal-fired again powder Air mixing process simultaneously, reduce the nitrogen oxide that the reburning fuel burning generates, increase also simultaneously that coal-fired again powder initial reaction stage produces can nitrogen oxides reduction the concentration of groups such as CHi, HCN, NHi, help the reduction of nitrogen oxide.High temperature corrosion and slagging scorification that reburning fuel horizontal bias mode is burnt and can also be alleviated the reburning zone.Adopt " horizontal bias wind " combustion system in the primary zone, it is the coal powder density height of a dense wind breeze airflow, help catching fire and steady combustion of breeze airflow, " horizontal bias wind " combustion system reduces the primary zone nitrogen oxide simultaneously and generates, a light wind breeze airflow coal powder density of back-fire side is lower, add the effect of side secondary air, can guarantee near the oxidizing atmosphere that water-cooling wall is, alleviate the slagging scorification and the high temperature corrosion in primary zone; The empty excess coefficient in primary zone can further suppress the generation of primary zone nitrogen oxide less than 1.Reburning zone of the present invention forms stable reducing atmosphere easily, and the high temperature corrosion and the slagging scorification that can obviously alleviate boiler, and common coal-burning boiler can reduce 50%～65% of discharged nitrous oxides.The present invention is main objective for implementation with coal-powder boiler, and initial outlay and operating cost are moderate, promptly can be applicable to newly constructed boiler, also is applicable to the improved use of active service coal-burning boiler unit.
Description of drawings
Fig. 1 is the schematic diagram that fires the low nitrogen oxide burning technology again.
The specific embodiment
The specific embodiment one: a kind of method that is used for the coal-burning boiler low nitrogen oxide burning realizes by following steps in the present embodiment: the regular particle size coal dust that () will account for boiler oil caloric value 80%～85% is sent into the primary zone of boiler furnace bottom, at excess air coefficient is to burn with horizontal bias wind combustion technology under 0.8～1.05 the condition; (2) utilizing air, flue gas or flue gas and AIR MIXTURES is that 20～60 microns the boiler oil caloric value that accounts for is that 15%～20% coal dust is sprayed into by the top, primary zone as reburning fuel with particle mean size, form the reburning zone, the excess air coefficient of reburning zone outlet is controlled to be 0.85～0.95, reburning zone gas residence time 0.2 second～0.8 second, reburning fuel burns with horizontal bias combustion technology or straight flow combustion mode; (3) spray into after-flame wind to the top of reburning zone, form burning-out zone and burning-out zone is exported excess air coefficient and be controlled to be 1.15～1.2, the imperfect combustion product of reburning zone outlet can reach the purpose of low nitrogen oxide burning in the coal-burning boiler at the further after-flame of burning-out zone.
The specific embodiment two: the regular particle size coal dust that the difference of the present embodiment and the specific embodiment one is will to account in the step () boiler oil caloric value 82%～84% is put into the primary zone of boiler furnace bottom.Other step is identical with the specific embodiment one.
The specific embodiment three: the regular particle size coal dust that the difference of the present embodiment and the specific embodiment one is will to account in the step () boiler oil caloric value 83% is put into the primary zone of boiler furnace bottom.Other step is identical with the specific embodiment one.
The specific embodiment four: the difference of the present embodiment and the specific embodiment one is that primary zone outlet excess air coefficient is 0.9～1.02 in the step ().Other step is identical with the specific embodiment one.
The specific embodiment five: the difference of the present embodiment and the specific embodiment one is that primary zone outlet excess air coefficient is 0.93～1 in the step ().Other step is identical with the specific embodiment one.
The specific embodiment six: the difference of the present embodiment and the specific embodiment one is that primary zone outlet excess air coefficient is 0.95 in the step ().Other step is identical with the specific embodiment one.
The specific embodiment seven: the difference of the present embodiment and the specific embodiment one is that primary zone outlet excess air coefficient is 0.9 in the step ().Other step is identical with the specific embodiment one.
The specific embodiment eight: the difference of the present embodiment and the specific embodiment one is in the step (two) with particle mean size to be that 25～40 microns the boiler oil caloric value that accounts for is that 16%～18% coal dust is sprayed into by the top, primary zone.Other step is identical with the specific embodiment one.
The specific embodiment nine: the difference of the present embodiment and the specific embodiment one is that the excess air coefficient that in the step (two) reburning zone is exported is controlled to be 0.88～0.92.Other step is identical with the specific embodiment one.
The specific embodiment ten: the difference of the present embodiment and the specific embodiment one is that the excess air coefficient that in the step (two) reburning zone is exported is controlled to be 0.9.Other step is identical with the specific embodiment one.
The specific embodiment 11: the difference of the present embodiment and the specific embodiment one is the middle reburning zone of step (two) gas residence time 0.3 second～0.6 second.Other step is identical with the specific embodiment one.
The specific embodiment 12: the difference of the present embodiment and the specific embodiment one be in the step (three) burning-out zone outlet excess air coefficient be the gas that under 1.18 the condition come out in the reburning zone from burning-out zone by and burning.Other step is identical with the specific embodiment one.
The specific embodiment 13: be implemented mode below in conjunction with Fig. 1 explanation, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning realizes by following steps in the present embodiment: the regular particle size coal dust (1) that () will account for boiler oil caloric value 85% is sent into the primary zone (A) of boiler furnace bottom, at excess air coefficient is to burn with horizontal bias wind combustion technology under 0.95 the condition; (2) utilizing air, flue gas or flue gas and AIR MIXTURES is that 45 microns the boiler oil caloric value that accounts for is that 15% coal dust (2) is sprayed into by the top, primary zone as reburning fuel with particle mean size, form the reburning zone, the excess air coefficient of reburning zone outlet is controlled to be 0.9, and the reburning zone gas residence time is 0.4 second.Reburning fuel burns with the horizontal bias combustion technology; (3) spray into after-flame wind (3) to the top of reburning zone (B), form burning-out zone (C) and the outlet excess air coefficient of burning-out zone (C) is controlled to be 1.15, the imperfect combustion product of reburning zone outlet further after-flame during by burning-out zone reaches the purpose of low nitrogen oxide burning in the coal-burning boiler.
Claims (9)
1, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning, it is characterized in that the method that is used for the coal-burning boiler low nitrogen oxide burning realizes by following steps: the regular particle size coal dust that () will account for boiler oil caloric value 80%～85% is sent into the primary zone of boiler furnace bottom, at primary zone outlet excess air coefficient is to burn with horizontal bias wind combustion technology under 0.8～1 the condition; (2) utilizing air, flue gas or flue gas and AIR MIXTURES is that 20～60 microns the boiler oil caloric value that accounts for is that 15%～20% coal dust is sprayed into by the top, primary zone as reburning fuel with particle mean size, form the reburning zone, the excess air coefficient of reburning zone outlet is controlled to be 0.85～0.95, reburning zone gas residence time 0.2 second～0.8 second, reburning fuel burns with horizontal bias combustion technology or straight flow combustion mode; (3) spray into after-flame wind to the top of reburning zone, form burning-out zone and burning-out zone is exported excess air coefficient and be controlled to be 1.15～1.2, the imperfect combustion product of reburning zone outlet can reach the purpose of low nitrogen oxide burning in the coal-burning boiler at the further after-flame of burning-out zone.
2, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1, the regular particle size coal dust that it is characterized in that will accounting in the step () boiler oil caloric value 82%～84% is sent into the primary zone of boiler furnace bottom.
3, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1, the regular particle size coal dust that it is characterized in that will accounting in the step () boiler oil caloric value 83% is put into the primary zone of boiler furnace bottom.
4, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1 is characterized in that primary zone outlet excess air coefficient is 0.95 in the step ().
5, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1 is characterized in that in the step (two) with particle mean size being that 25～40 microns the boiler oil caloric value that accounts for is that 16%～18% coal dust is sprayed into by the top, primary zone.
6, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1 is characterized in that the excess air coefficient that in the step (two) reburning zone is exported is controlled to be 0.88～0.92.
7, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1 is characterized in that the excess air coefficient that in the step (two) reburning zone is exported is controlled to be 0.9.
8, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1 is characterized in that the middle reburning zone of step (two) gas residence time 0.3 second～0.6 second.
9, a kind of method that is used for the coal-burning boiler low nitrogen oxide burning according to claim 1 is characterized in that in the step (three) under burning-out zone outlet excess air coefficient is 1.18 condition the reburning zone being exported the further after-flame of imperfect combustion product.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100718163A CN100455885C (en) | 2007-02-28 | 2007-02-28 | A method for combustion of low nitrogen oxides in coal-fired boilers |
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| CNB2007100718163A CN100455885C (en) | 2007-02-28 | 2007-02-28 | A method for combustion of low nitrogen oxides in coal-fired boilers |
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| CN100455885C true CN100455885C (en) | 2009-01-28 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003701B (en) * | 2010-11-23 | 2012-12-26 | 浙江大学 | Low NOx coal dust combustion method and device based on underfire air and overfire air |
| CN102252324B (en) * | 2011-05-16 | 2013-03-27 | 徐州燃控科技股份有限公司 | Method for combusting fuel reburning low-nitrogen oxide |
| TWI435036B (en) * | 2011-10-06 | 2014-04-21 | Long Chen Paper Co Ltd | Combustion system with low nitrogen oxides emission |
| CN102777891A (en) * | 2012-07-19 | 2012-11-14 | 无锡华光锅炉股份有限公司 | Furnace combustion structure for reducing NOx (nitrogen oxide) discharge |
| CN110345470A (en) * | 2019-07-16 | 2019-10-18 | 江苏汇能锅炉有限公司 | Denitrating technique in a kind of circulating fluid bed boiler |
| CN117781265B (en) * | 2023-12-26 | 2025-06-24 | 哈尔滨工业大学 | Recombustion of pulverized coal to reduce NO by using active gas to temperxApparatus and method of (a) |
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| JPH08121711A (en) * | 1994-10-19 | 1996-05-17 | Hitachi Ltd | Pulverized coal combustion method, pulverized coal combustion device and pulverized coal burner |
| US6189464B1 (en) * | 1998-01-30 | 2001-02-20 | Hitachi, Ltd. | Pulverized coal combustion burner and combustion method thereby |
| EP1416221A1 (en) * | 2002-07-11 | 2004-05-06 | Praxair Technology, Inc. | NOx-reduced combustion of concentrated coal streams |
| CN1587802A (en) * | 2004-08-23 | 2005-03-02 | 国电热工研究院 | Fine coal powder recombustion denitrificating method |
| CN1757966A (en) * | 2004-10-10 | 2006-04-12 | 辽宁东电燃烧设备有限公司 | Combustion technology of low nitrogen oxide |
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2007
- 2007-02-28 CN CNB2007100718163A patent/CN100455885C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121711A (en) * | 1994-10-19 | 1996-05-17 | Hitachi Ltd | Pulverized coal combustion method, pulverized coal combustion device and pulverized coal burner |
| US6189464B1 (en) * | 1998-01-30 | 2001-02-20 | Hitachi, Ltd. | Pulverized coal combustion burner and combustion method thereby |
| EP1416221A1 (en) * | 2002-07-11 | 2004-05-06 | Praxair Technology, Inc. | NOx-reduced combustion of concentrated coal streams |
| CN1587802A (en) * | 2004-08-23 | 2005-03-02 | 国电热工研究院 | Fine coal powder recombustion denitrificating method |
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Non-Patent Citations (1)
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| 中国电机工程学报. 金晶，张忠孝，李瑞阳，215-218. 2004 * |
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Assignee: BEIJING GUODIAN LONGGAOKE ENVIRONMENT ENGINEERING & TECHNOLOGY CO., LTD. Assignor: Harbin Institute of Technology Contract record no.: 2012990000153 Denomination of invention: Method for burning of low nitrogen oxides in coal-burning boiler Granted publication date: 20090128 License type: Exclusive License Open date: 20070815 Record date: 20120330 |
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