CN109737388A - A kind of low NO of pulverized coal preheating solutionxBoiler combustion system - Google Patents
A kind of low NO of pulverized coal preheating solutionxBoiler combustion system Download PDFInfo
- Publication number
- CN109737388A CN109737388A CN201811603352.0A CN201811603352A CN109737388A CN 109737388 A CN109737388 A CN 109737388A CN 201811603352 A CN201811603352 A CN 201811603352A CN 109737388 A CN109737388 A CN 109737388A
- Authority
- CN
- China
- Prior art keywords
- burner
- level
- low
- preheating
- hearth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a kind of low NO of pulverized coal preheating solutionxBoiler combustion system belongs to Thermal Energy and Power Engineering technical field, including the preheating gasification hearth being adjacently positioned and burner hearth, is connected to below by V-type ash bucket；It is provided with burner at the top of preheating gasification hearth, the coal dust First air sleeve for introducing coal dust gas-solid mixture is offered on burner；Successively interval opens up overfire air port, level-one fire air nozzle and second level fire air nozzle to burner hearth side wall from the bottom to top, combustion zone, level-one burning-out zone and second level burning-out zone will be accordingly divided into burner hearth from the bottom to top, burner hearth top opens up back-end ductwork, by the low NO such as coal powder pre-burning, gasification, flue gas recirculation and air classificationxCombustion technology is coupled, it is made to play collaboration denitration effect, while playing the role of simplifying burner and saving fuel cost.
Description
Technical field
The invention belongs to Thermal Energy and Power Engineering technical field, the low NO of especially a kind of pulverized coal preheating solutionxBoiler combustion system
System.
Background technique
As low NOxOne of representative of combustion technology, coal powder pre-burning technology are developed rapidly in recent years.Coal dust
Into before burner, the precombustion chamber heated by external heat source is first flowed into.Since the oxygen content that First air carries is far below
Amount of oxygen needed for coal dust completely burned, precombustion chamber is interior to be presented reducing atmosphere.Coal dust heated fast decoupled in precombustion chamber, is released
A large amount of volatile matters are released, while being precipitated in a gaseous form with a large amount of nitrogenous compounds.The burning of volatile matter part is precombustion chamber
Heat is provided.Under reducing atmosphere of the excess air coefficient much smaller than 1, HCN, NH3Etc. nitrogenous intermediate product and NOxBy
Series reaction is reduced into N2, so that NOxGeneration and discharge significantly reduce.
Air classification is as low NOxCombustion air is segmented by multistage air distribution and is sent into combustion by the Typical Representative of combustion technology
Region is burnt, fuel-rich regions and local reduction atmosphere is formed, can obviously inhibit NO in process of coal combustionxIt generates, effectively
Reduce NOxFinal discharge.Therefore the research based on air classification is particularly important.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, provide a kind of pulverized coal preheating solution low NOxBoiler combustion
Burning system, by the low NO such as coal powder pre-burning, gasification, flue gas recirculation and air classificationxCombustion technology is coupled, it is made to play collaboration
Denitration effect, while playing the role of simplifying burner and saving fuel cost.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
A kind of low NO of pulverized coal preheating solutionxBoiler combustion system, including the preheating gasification hearth being adjacently positioned and burner hearth,
It is connected to below by V-type ash bucket；It is provided with burner at the top of preheating gasification hearth, is offered on burner for introducing coal dust
The coal dust First air sleeve of gas-solid mixture；Successively interval opens up overfire air port, level-one combustion to burner hearth side wall from the bottom to top
Wind snout and second level fire air nozzle to the greatest extent, will accordingly be divided into combustion zone, level-one burning-out zone and second level from the bottom to top in burner hearth
Burning-out zone, burner hearth top open up back-end ductwork.
A further improvement of the present invention lies in that:
Burner is the vortex burner for making coal dust gas-solid mixture inject preheating gasification hearth vertically.
Flue gas recycled entrance is offered on burner.
Flue gas recycled inlet is equipped with the swirl vane for making flue gas recycled have spinning momentum.
Preheating gasification hearth inner wall is laid with refractory insulating layer.
Burner hearth inner wall is laid with water-cooling wall.
Wind at overfire air port, level-one fire air nozzle and second level fire air nozzle is entered in a manner of quadrangle tangential circle
Burner hearth.
Excess air coefficient is less than 0.3 in preheating gasification hearth.
Combustion zone excess air coefficient is 0.6-0.7, and the excess air coefficient of level-one burning-out zone is 0.8-0.9, second level combustion
The excess air coefficient in area is 1.1-1.25 to the greatest extent.
Compared with prior art, the invention has the following advantages:
Coal dust catches fire in preheating gasification hearth to gasify, and the gasification gas and semicoke of generation enter burning by V-type ash bucket
Multistage low oxygen combustion, overfire air port, level-one fire air nozzle, second level fire air nozzle and back-end ductwork interval are carried out after burner hearth
It is arranged in combustion zone inner wall, suitable Secondary Air enters combustion zone by overfire air port, carries out multistage low oxygen combustion.At this time two
Secondary wind mixes after-combustion in burning reducing zone with the gasification gas and semicoke for entering combustion zone, in reducing zone of burning largely also
Originality gas is under low-oxygen environment by a part of NO in flue gasxIt is reduced to N2, NO in flue gasxContent further decreases, and one
Grade burnout degree enters flow-up burning section by level-one fire air nozzle, and forms level-one burning-out zone.Second level burnout degree passes through second level
Fire air nozzle enters flow-up burning section, and forms second level burning-out zone.Above-mentioned burnout degree is passed through in the form of quadrangle tangential circle
Burner hearth is strengthened the blending between each component while providing to uncombusted component and burning required oxygen, is realized under lower oxygen amount
Burning, be further reduced NOxGeneration.It preheats the interior recirculating zone volume formed using eddy flow flue gas recycled of gasification hearth and inhales height
Warm flue gas preheats coal dust and First air, is on the one hand conducive to stablize burning, on the other hand makes coal dust in preheating gasification furnace
Divided combustion and pyrolysis inside thorax, the heated pyrolysis first of nitrogen organic compound in fuel is the intermediate products such as hydrogen cyanide, and low
N is converted under the conditions of oxygen2, NO is effectively reducedxProduction quantity.
Further, vortex burner makes the wind powder mixture in exit inject burner hearth straight down.
Further, preheating gasification hearth inner wall is laid with refractory insulating layer, and the heat loss of less gasification hearth maintains
The temperature of pre- pyrolysis zone guarantees going on smoothly for coal powder ignition gasification.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention.
Wherein: 1- coal dust First air sleeve；2- flue gas recycled entrance；3- swirl vane；4- refractory insulating layer；5- is pre-
Thermal evaporation burner hearth；6-V type ash bucket；7- burner hearth；8- water-cooling wall；9- overfire air port；10- level-one fire air nozzle；11- bis-
Grade fire air nozzle.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, the embodiment being not all of, and it is not intended to limit range disclosed by the invention.In addition, with
In lower explanation, descriptions of well-known structures and technologies are omitted, obscures concept disclosed by the invention to avoid unnecessary.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment should fall within the scope of the present invention.
The various structural schematic diagrams for disclosing embodiment according to the present invention are shown in the attached drawings.These figures are not in proportion
It draws, wherein some details are magnified for the purpose of clear expression, and some details may be omitted.As shown in the figure
The shape in various regions, layer and relative size, the positional relationship between them out is merely exemplary, in practice may be due to
Manufacturing tolerance or technical restriction and be deviated, and those skilled in the art may be additionally designed as required have not
Similar shape, size, the regions/layers of relative position.
In context disclosed by the invention, when one layer/element is referred to as located at another layer/element "upper", the layer/element
Can may exist intermediate layer/element on another layer/element or between them.In addition, if in a kind of court
One layer/element is located at another layer/element "upper" in, then when turn towards when, the layer/element can be located at another layer/
Element "lower".
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1, a burner arrangement of the invention is in the surface of pre-burning gasification hearth 5, turbulent burner exit
Coal dust and First air direct current inject preheating gasification hearth 5, flue gas recycled is by flue gas recycled entrance 2, in swirl vane 3
Under the action of obtain spinning momentum, in freeze profile at rotating jet, the high-temperature flue gas that volume inhales in pre-burning gasification hearth 5 come so that
Coal dust and First air are rapidly heated；It forms pulverized coal pyrolysis, gasification and part before V-type ash bucket 6 to burn, pre-burning gasification product warp
Flow direction is converted after crossing V-type ash bucket 6, becomes flow-up burning, forms master between overfire air port 9 and level-one fire air nozzle 10
The low oxygen combustion area wanted forms hypoxemia burning-out zone between level-one fire air nozzle 10 and second level fire air nozzle 11.
Coal dust by turbulent burner sprays into pre- pyrolysis zone I after mixing with suitable air, and flue gas recycled by following again
Ring smoke inlet 2 forms the rotating jet with high spinning momentum, guarantees that the excess air coefficient in pyrolysis zone is less than and approaches
In 0.3, in pre-burning pyrolysis zone kindling gasification occurs for coal dust, and since pre-burning pyrolysis zone oxygen content is lower, coal dust gasification is precipitated big
Measure reducibility gas (CO, CH4、H2、HCN、NH3) and generate semicoke, subsequent reducibility gas and semicoke by the change of V-type ash bucket 6
Flow direction is changed, flow-up burning is formed.
In combustion zone II, due to the set-up mode of the bellows chamber powder of Secondary Air, Boiler Furnace slagging and high temperature corrosion are prevented.It is firing
Burn area burner top a distance and be provided with level-one fire air nozzle 10, at a distance of one section of 10 top of level-one fire air nozzle away from
From being provided with second level fire air nozzle 11.It is combustion zone from overfire air port 9 to the region level-one fire air nozzle 10
Ⅱ；It is level-one burning-out zone III from level-one fire air nozzle 10 to the region second level fire air nozzle 11；From second level burnout degree
The region that spout 12 arrives between furnace outlet 13 is second level burning-out zone IV.
In order to guarantee to preheat the low-oxygen environment in gasification hearth, it is desirable that:
That is excess air coefficient total in gasification hearth is preheated to be less than equal to 0.3, in actual moving process
It can be somewhat different from that, but should be ensured that in general 0.3 or so according to the difference of coal dust, guarantee coal dust in pre- pyrolysis zone energy
Heat is released in the burning of progress part, to offset the heat that semicoke is consumed in the gasification of pre- pyrolysis zone, to maintain the temperature of pre- pyrolysis zone,
Lower oxygen can also reduce NO simultaneouslyxGeneration.
The gentle stream of flame after coal dust gasification enters the combustion zone of 7 lower part of burner hearth, excess air coefficient 0.6-
0.7, it is depth anoxycausis state, forms a large amount of reducibility gas, inhibits NOxIt generates.Later, flame flow enters burning and prolongs
Exhibition section, NOxFurther it is reduced.When flame flow enters level-one burning-out zone, from level-one fire air nozzle infeed section burnout degree,
Make excess air coefficient 0.8-0.9, coal dust burns away under the conditions of oxygen debt, still generates a certain amount of reducing atmosphere, difficult
In generation NOx.When flame flow enters second level burning-out zone, then by second level fire air nozzle infeed section burnout degree, make excessive sky
Gas coefficient is 1.1-1.25, and flue-gas temperature at this time is at 1100 DEG C hereinafter, thermal NOxIt is difficult to be formed, while the combustion of coal dust
Material type NOxIt has reached minimum.
Gasification of the invention decouples low NOxUltralow NO may be implemented in boiler combustion modexIt is generated as 80mg ˙ m-3-120mg
˙m-3, directly reach station boiler NOxCommon exhaust standard, be not required to the investment of tail portion denitrification apparatus.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (9)
1. a kind of low NO of pulverized coal preheating solutionxBoiler combustion system, which is characterized in that including the preheating gasification hearth (5) being adjacently positioned
With burner hearth (7), it is connected to below by V-type ash bucket (6)；Burner, burner are provided at the top of preheating gasification hearth (5)
On offer coal dust First air sleeve (1) for introducing coal dust gas-solid mixture；Burner hearth (7) side wall is from the bottom to top successively
Interval opens up overfire air port (9), level-one fire air nozzle (10) and second level fire air nozzle (11), will be in burner hearth (7)
Accordingly it is divided into combustion zone, level-one burning-out zone and second level burning-out zone from the bottom to top, burner hearth (7) top opens up back-end ductwork
(12)。
2. the low NO of a kind of pulverized coal preheating solution as described in claim 1xBoiler combustion system, which is characterized in that burner is to make coal dust
Gas-solid mixture injects the vortex burner of preheating gasification hearth (5) vertically.
3. the low NO of a kind of pulverized coal preheating solution as described in claim 1xBoiler combustion system, which is characterized in that offered on burner
Flue gas recycled entrance (2).
4. the low NO of a kind of pulverized coal preheating solution as described in claim 1xBoiler combustion system, which is characterized in that flue gas recycled entrance
(2) swirl vane (3) for making flue gas recycled that there is spinning momentum is equipped at.
5. the low NO of a kind of pulverized coal preheating solution as claimed in claim 1 or 2xBoiler combustion system, which is characterized in that preheating gasification furnace
Thorax (5) inner wall is laid with refractory insulating layer (4).
6. the low NO of a kind of pulverized coal preheating solution as claimed in claim 5xBoiler combustion system, which is characterized in that in burner hearth (7)
Wall is laid with water-cooling wall (8).
7. the low NO of a kind of pulverized coal preheating solution as claimed in claim 6xBoiler combustion system, which is characterized in that overfire air port (9),
Wind at level-one fire air nozzle (10) and second level fire air nozzle (11) enters burner hearth in a manner of quadrangle tangential circle
(7)。
8. the low NO of a kind of pulverized coal preheating solution as claimed in claim 7xBoiler combustion system, which is characterized in that preheating gasification hearth
(5) interior excess air coefficient is less than 0.3.
9. the low NO of a kind of pulverized coal preheating solution as claimed in claim 8xBoiler combustion system, which is characterized in that combustion zone excess air
Coefficient is 0.6-0.7, and the excess air coefficient of level-one burning-out zone is 0.8-0.9, and the excess air coefficient of second level burning-out zone is
1.1-1.25。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811603352.0A CN109737388A (en) | 2018-12-26 | 2018-12-26 | A kind of low NO of pulverized coal preheating solutionxBoiler combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811603352.0A CN109737388A (en) | 2018-12-26 | 2018-12-26 | A kind of low NO of pulverized coal preheating solutionxBoiler combustion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109737388A true CN109737388A (en) | 2019-05-10 |
Family
ID=66361273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811603352.0A Pending CN109737388A (en) | 2018-12-26 | 2018-12-26 | A kind of low NO of pulverized coal preheating solutionxBoiler combustion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109737388A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032709A (en) * | 2020-08-30 | 2020-12-04 | 国电内蒙古东胜热电有限公司 | Ultra-low NOx emission system and method using pre-pyrolysis in combination with ammonia injection |
| CN112413569A (en) * | 2020-10-14 | 2021-02-26 | 上海交通大学 | High-speed jet flow over-fire air device with circulating flue gas |
| CN113048460A (en) * | 2021-04-22 | 2021-06-29 | 东北电力大学 | Adopt ultralow nitrogen emission boiler of E type combustor |
| CN113819455A (en) * | 2021-07-22 | 2021-12-21 | 华能巢湖发电有限责任公司 | Method and equipment for reducing NOx of boiler in multi-stage mode |
| CN115013804A (en) * | 2022-05-17 | 2022-09-06 | 哈尔滨工业大学 | Braway type W flame boiler device and method for gasification coupled combustion |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100561A (en) * | 1985-04-01 | 1986-03-10 | 浙江大学 | Water-coal-slurry and coal dust boiler with precombustion chamber for burning |
| CN1834535A (en) * | 2006-03-16 | 2006-09-20 | 周开根 | Smokeless coal burning boiler and gas synthetizing equipment thereof |
| CN101429459A (en) * | 2008-12-24 | 2009-05-13 | 中国科学院工程热物理研究所 | Front-boiler coal drawhead method for pulverized coal fired boiler |
| CN101761920A (en) * | 2009-12-16 | 2010-06-30 | 上海理工大学 | Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas |
| CN102200275A (en) * | 2011-04-12 | 2011-09-28 | 上海理工大学 | Combustion device for dewatering upgradation of lignite and reduction of nitrogen oxide emission and method thereof |
| CN204400906U (en) * | 2015-01-14 | 2015-06-17 | 烟台龙源电力技术股份有限公司 | Pulverized coal pyrolysis pollutant disposal system and boiler combustion system |
-
2018
- 2018-12-26 CN CN201811603352.0A patent/CN109737388A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100561A (en) * | 1985-04-01 | 1986-03-10 | 浙江大学 | Water-coal-slurry and coal dust boiler with precombustion chamber for burning |
| CN1834535A (en) * | 2006-03-16 | 2006-09-20 | 周开根 | Smokeless coal burning boiler and gas synthetizing equipment thereof |
| CN101429459A (en) * | 2008-12-24 | 2009-05-13 | 中国科学院工程热物理研究所 | Front-boiler coal drawhead method for pulverized coal fired boiler |
| CN101761920A (en) * | 2009-12-16 | 2010-06-30 | 上海理工大学 | Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas |
| CN102200275A (en) * | 2011-04-12 | 2011-09-28 | 上海理工大学 | Combustion device for dewatering upgradation of lignite and reduction of nitrogen oxide emission and method thereof |
| CN204400906U (en) * | 2015-01-14 | 2015-06-17 | 烟台龙源电力技术股份有限公司 | Pulverized coal pyrolysis pollutant disposal system and boiler combustion system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032709A (en) * | 2020-08-30 | 2020-12-04 | 国电内蒙古东胜热电有限公司 | Ultra-low NOx emission system and method using pre-pyrolysis in combination with ammonia injection |
| CN112032709B (en) * | 2020-08-30 | 2022-08-26 | 国电内蒙古东胜热电有限公司 | Ultra-low NOx emission system and method adopting combination of pre-pyrolysis and ammonia injection |
| CN112413569A (en) * | 2020-10-14 | 2021-02-26 | 上海交通大学 | High-speed jet flow over-fire air device with circulating flue gas |
| CN113048460A (en) * | 2021-04-22 | 2021-06-29 | 东北电力大学 | Adopt ultralow nitrogen emission boiler of E type combustor |
| CN113819455A (en) * | 2021-07-22 | 2021-12-21 | 华能巢湖发电有限责任公司 | Method and equipment for reducing NOx of boiler in multi-stage mode |
| CN113819455B (en) * | 2021-07-22 | 2024-03-08 | 华能巢湖发电有限责任公司 | Method and equipment for reducing boiler NOx in multiple sections |
| CN115013804A (en) * | 2022-05-17 | 2022-09-06 | 哈尔滨工业大学 | Braway type W flame boiler device and method for gasification coupled combustion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109737388A (en) | A kind of low NO of pulverized coal preheating solutionxBoiler combustion system | |
| CN105020700B (en) | A kind of grate firing boiler combination denitrification apparatus and method | |
| US6699029B2 (en) | Oxygen enhanced switching to combustion of lower rank fuels | |
| US8505496B2 (en) | Method for burning coal using oxygen in a recycled flue gas stream for carbon dioxide capture | |
| CN102305415B (en) | Plasma oil-free ignition system in oxygen-enriched environments | |
| PL196858B1 (en) | Method of combusting coal in concentrated streams with nox reduction | |
| JPH05507140A (en) | Collective concentric angular combustion system | |
| JPS5942202B2 (en) | Pulverized coal combustion furnace | |
| CN109990267B (en) | Low NO suitable for low-volatile fuel co-combustion of biomassxCombustion system | |
| CN107559821B (en) | The multiple-pass industrial coal powder boiler of flue gas recirculation and vortex burner overhead | |
| CN106122945A (en) | A kind of low-NOx coal powder system and method | |
| CN202546811U (en) | Compound furnace arch and compound secondary air structure | |
| CN104990069A (en) | Combustion system improving safety and economical performance of opposite-firing boiler | |
| CN106439889A (en) | Anthracite large oxygen-enriched combustion system and method with novel direct blowing powder production device | |
| CN109058980A (en) | It is a kind of to can be used for biomass or coal dust be across the low NO of Load RegulationxBurner | |
| CN103884013B (en) | Manifold type environment-friendly type fluidized-bed combustion boiler combustion method and device | |
| CN101142447A (en) | Combustion method and system | |
| CN109578994B (en) | Low NOx combustion system of flue gas recirculation and hierarchical gasification of superfine buggy | |
| CN103256590A (en) | Method and device for multi-grade mixed combustion of double fuels at cyclone state | |
| CN107606601A (en) | Burning method for organizing in a kind of opposed firing pulverized-coal fired boiler stove | |
| US20060201405A1 (en) | Cyclone furnace for oxygen fired boilers with flue gas recirculation | |
| CN102679390A (en) | Compound furnace arch and compound secondary air structure for cooperatively controlling generation of nitrogen oxide (NOX) | |
| CN105605560A (en) | Micro-emission pulverized coal combustion system | |
| CN209371229U (en) | A kind of fuel-air flue gas three is classified the grate firing boiler and its system of low nitrogen burning | |
| CN204786354U (en) | Combustion system of wall opposed firing boiler security and economic nature around improving |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190510 |