CN107606601B - A kind of interior method for organizing that burns of opposed firing pulverized-coal fired boiler furnace - Google Patents
A kind of interior method for organizing that burns of opposed firing pulverized-coal fired boiler furnace Download PDFInfo
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- CN107606601B CN107606601B CN201710727086.1A CN201710727086A CN107606601B CN 107606601 B CN107606601 B CN 107606601B CN 201710727086 A CN201710727086 A CN 201710727086A CN 107606601 B CN107606601 B CN 107606601B
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Abstract
A kind of interior method for organizing that burns of opposed firing pulverized-coal fired boiler furnace, belongs to boiler coal-ash field of combustion technology.This method is that fuel needed for a part burning is directly entered burner hearth side wall fuel nozzle ports in the form of jet stream, so that it is mixed combining combustion with hot fume caused by front-back wall burner, remaining fuel enters and burns yet by front-back wall burner.Side wall feeds the mixing that fuel has postponed part of fuel and Secondary Air, fuel-staged combustion is realized, to further reduce NOx generation amount；The fuel combustion near side wall can realize the homogenization of boiler combustion zone fuel level distribution simultaneously, mitigate top horizontal flue entrance flying dust brought by original burning tissues and be unevenly distributed caused dust stratification problem, be advantageously implemented the stable operation of unit.Present invention design is simple, adjusts convenient for burning tissues, and integrated operation is at low cost.
Description
Technical field
The present invention relates to the method for organizing that burns in opposed firing pulverized-coal fired boiler furnace, belong to boiler coal-ash field of combustion technology.
Background technique
In China, 300MW and the unit of following level are just gradually replaced by large-sized unit at present, therefore, 600MW and its with
The overcritical and extra-supercritical unit of upper grade ratio shared in fossil-fired unit is increasing always.Wherein, most of
The boiler of unit is using opposed firing combustion system.
But in recent years, as the environmental requirement to coal-fired electric generation furnace pollutant emission is increasingly strict, overwhelming majority power generation
Unit uses low-NO_x combustion technology and low nitrogen burning equipment, to meet environmental requirements.Wherein, low-NO_x combustion technology is mainly air
Grading combustion technology, i.e. primary zone carry out fuel-rich combustion, reduce NOx and generate；Burning-out zone is oxygen-enriched combusting, guarantees furnace height
The coal dust in direction being capable of after-flame in the later period；It is reducing zone between primary zone and burning-out zone, when providing enough for NOx reduction reaction
Between, to realize low NOx drainage.And low nitrogen burning equipment is mainly low NO, wherein in the pulverized coal firing boiler that liquidates most
Commonly vortex burner, i.e., on the horizontal cross-section of burner hearth, first and second breeze airflow is formed by rotating vane to be revolved
Turn jet stream and enter burner hearth, First air forms interior recirculating zone, and volume inhales high-temperature flue gas, takes the lead in catching fire, and the outside recirculating zone of flame is propagated.With
This simultaneously, Secondary Air formed exteenal reflux area, provide oxygen amount for coal dust firing.The technology realizes burner outlet fractional combustion
Effect, the NOx for reducing burner region are generated, and also have very good effect to coal-powder steady flame.
But the jet stream of the kindling near coal burner jet exit and initial stage of burning all only is paid close attention in current existing research
Burning tissues (such as setting spout surrounding air, adherent wind etc.), and the later period combustion of the coal dust firing on concern furnace height direction
Tissue (such as front-back wall increases side burnout degree) is burnt, design is complicated, is not easy to control, can not effectively solve boiler side water wall
The problem of high temperature corrosion.Therefore, it is necessary to which the burning tissues method to horizontal direction optimizes, and seek a kind of simple height
The combustion system of effect steadily runs to realize that pulverized-coal fired boiler cleans.
Summary of the invention
The purpose of the present invention is to propose to the method for organizing that burns in a kind of opposed firing pulverized-coal fired boiler furnace, make it in original low nitrogen
The discharge of nitrogen oxides is further decreased on the basis of combustion technology；Horizontal flue bottom dust stratification is solved the problems, such as simultaneously, improves pot
The uniform distribution of forces of furnace roof portion horizontal flue inlet flying dust mitigates boiler operatiopn stability problem brought by dust stratification.
Technical scheme is as follows:
Front-back wall eddy flow is arranged in boiler primary zone in a kind of interior method for organizing that burns of opposed firing pulverized-coal fired boiler furnace, this method
Separated-type over-fire-air nozzle is arranged in burning-out zone in coal burner, and realization primary zone is fuel-rich combustion, and burning-out zone is oxygen-enriched combustion
It burns, which is characterized in that the method is that the spray of side wall fuel is added on side wall at left and right sides of the primary zone of Pulverized Coal fired Boiler Furnace
Mouthful, required part of fuel of burning is injected directly into burner hearth by side wall fuel nozzle ports with pattern, with the front-back wall eddy flow
Hot fume caused by coal burner mixes combining combustion, and remaining fuel enters burner hearth yet by front-back wall vortex burner
And it burns.
Burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace, it is characterised in that: in the same time from
The fuel total calorific value that side wall fuel nozzle ports are added is up to the 30% of boiler oil total calorific value.
Burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace, it is characterised in that: the spray of side wall fuel nozzle ports
The fuel entered is in coal, biomass, pyrolysis of coal product, biomass pyrolysis product, natural gas, liquefied petroleum gas or blast furnace gas
One or more combination.
A kind of opposed firing pulverized-coal fired boiler furnace in burn method for organizing, it is characterised in that: the side wall fuel nozzle ports exist
It is arranged symmetrically on side wall at left and right sides of boiler furnace.
Burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace, it is characterised in that: in each side wall fuel
The inlet of spout is equipped with the regulating device for adjusting side wall fuel nozzle ports jet exit velocity and air force.
Burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace, it is characterised in that: on the side wall of the left and right sides
The number of plies of the side wall fuel nozzle ports on furnace height direction be 1-4 layers；It is respectively set on the side wall of the left and right sides on the same layer
1-3 side wall fuel nozzle ports are located at side water wall center when quantity is one；When quantity is two, it is located at
Side water wall center two sides symmetric position；When quantity is three, one is located at side water wall center, other two point
Not Wei Yu side water wall center two sides symmetric position.
Burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace, it is characterised in that: the side wall fuel spray
The outlet shapes of mouth are rectangle or ellipse.
1. part of fuel is added by side wall compared with prior art, the present invention having the advantage that, realizes part
The organizational form of fuel-staged combustion, can on the basis of original low-NO_x combustion technology further emission reduction NOx；2. original front and back
Wall opposed firing mode, boiler cross section combustion zone keep away from boiler two sides side wall, that is, fuel combustion are concentrated mainly on pot
The deviation of flying dust concentration at top horizontal flue entrance is caused in the intermediate region of furnace left and right directions, and thus bring is horizontal
Stack base dust stratification problem.The present invention is homogenized by the horizontal cross-section for being distributed main combustion zone fuel, improves boiler top horizontal
The uniform distribution of forces of flying dust at flue entrance mitigates boiler operatiopn stability problem brought by dust stratification.3. side wall fuel sprays
Other fuel (such as biomass pyrolytic semicoke or blast furnace gas) can be added in mouth for boiler, realize multi fuel combustion system, no
NOx generation amount in furnace is only further decreased, and the discharge of fine particle can be reduced.Present invention design is simple, comprehensive convenient for control
Operating cost is low.
Detailed description of the invention
Fig. 1 is the opposed firing pulverized-coal fired boiler that side wall at left and right sides of burner hearth primary zone is disposed with side wall fuel nozzle ports
Principle schematic diagram.
Fig. 2 is the direction A-A view in Fig. 1.
In figure: 1- front-back wall vortex burner；2- Separated-type over-fire-air nozzle (i.e. SOFA nozzle)；3- side wall fuel
Spout；4- boiler furnace primary zone；5- boiler furnace reducing zone；6- boiler furnace burning-out zone.
Specific embodiment
The principle of the present invention and specific implementation process are described further and are explained with reference to the accompanying drawings and examples,
And with the present invention is more fully understood, other objects and results of the present invention be will be more clearly understood and understood.
Fig. 1 is the opposed firing pulverized-coal fired boiler that side wall at left and right sides of burner hearth primary zone is disposed with side wall fuel nozzle ports
Principle schematic diagram, there is shown the distribution of side wall fuel nozzle ports 3 on furnace height direction.Boiler original low nitrogen burning system
It is close with current all burner hearth low nitrogen burning system integral arrangement forms with burnout degree, burner hearth is fired along furnace height direction
Burning is divided into three regions: lower part is boiler furnace primary zone 4, is from Separated-type over-fire-air nozzle lowest level to furnace outlet section
Boiler furnace burning-out zone 6, region is boiler furnace reducing zone 5 between boiler furnace primary zone 4 and boiler furnace burning-out zone 6.?
Front-back wall vortex burner 1, boiler furnace burning-out zone 6 are set on the front-back wall boiler water wall in boiler furnace primary zone 4
Arrange Separated-type over-fire-air nozzle (i.e. SOFA nozzle) 2, realization primary zone is fuel-rich combustion, and burning-out zone is oxygen-enriched combusting,
Purpose is to realize low nitrogen burning；Burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace provided by the invention, is in this base
On plinth, side wall fuel nozzle ports 3 also are added on the side wall at left and right sides of the primary zone of Pulverized Coal fired Boiler Furnace, needed for part is burnt
Fuel burner hearth is injected directly into pattern by side wall fuel nozzle ports, and produced by the front-back wall vortex burner
Hot fume mix combining combustion, remaining fuel enters burner hearth yet by front-back wall burner and burns.Part of fuel is passed through into side
Wall is added, and realizes the organizational form of local burnup's fractional combustion, can be on the basis of original low-NO_x combustion technology further
Emission reduction NOx.
For the horizontal cross-section homogenization for being distributed main combustion zone fuel, the side wall fuel nozzle ports are in boiler furnace or so two
It is preferably arranged symmetrically on the side wall of side.The number of plies one of the side wall fuel nozzle ports 3 on furnace height direction on the side wall of the left and right sides
As be 1-4 layers；1-3 side wall fuel nozzle ports are respectively set on the side wall of the left and right sides on the same layer, when quantity is one, position
At side water wall center；When quantity is two, it is located at side water wall center two sides symmetric position；When quantity is
At three, one is located at side water wall center, other two is located at the symmetric position of side water wall center two sides.
The outlet shapes of the side wall fuel nozzle ports 3 are generally rectangular or oval.In each side wall fuel nozzle ports
Inlet is also settable for adjusting the regulating device of side wall fuel nozzle ports jet exit velocity and air force, the spray of side wall fuel
Mouth outlet jet direction can be swung in vertical direction and horizontal direction, in actual operation adjustable gas flow jet angle,
Realize optimal burning tissues in furnace.
In combustion, should not be too many by the fuel that side wall fuel nozzle ports 3 enter, under normal circumstances, when identical
The interior fuel total calorific value being added from side wall fuel nozzle ports is up to the 30% of boiler oil total calorific value.Side wall fuel nozzle ports
The fuel of penetrating can be coal, biomass, pyrolysis of coal product, biomass pyrolysis product, natural gas, liquefied petroleum gas or blast furnace gas
One or more of combination.
Embodiment:
It is bituminous coal and meager coal multifuel combustion, as-fired coal to coal quality of the present invention by taking a 1000MW opposed firing pulverized-coal fired boiler as an example
For matter ash fusion point at 1200 DEG C or so, low heat valve is 20MJ/kg or so, and boiler original combustion system is used with the low of burnout degree
Nitrogen combustion technology.
In former boiler design, First air carries whole coal dusts and enters burner hearth, and the total intake of burner hearth is that coal dust firing is theoretical
The 120% of air capacity wherein enters needed for coal dust firing 85% theoretical air requirement in total in boiler furnace primary zone 4, wherein
First air accounts for the 24% of coal dust firing theoretical air requirement, and Secondary Air accounts for the 61% of coal dust firing theoretical air requirement；In addition coal dust fires
35% theoretical air requirement needed for burning enters upper furnace boiler furnace burning-out zone 6 by Separated-type over-fire-air nozzle 2.
The example after applying the present invention, First air is divided into two parts, a portion passes through front-back wall rotational flow coal dust
Burner 1, accounts for 20% or so of coal dust firing theoretical air requirement, and another part accounts for coal dust firing reason by side wall fuel nozzle ports 3
By 4% or so of air capacity, the ratio that secondary air flow and after-flame air quantity account for required theoretical air requirement does not change, respectively
61% and 35%.At this point, the share that the fuel total calorific value that side wall fuel nozzle ports 3 are added accounts for boiler oil total calorific value is about
17%.
As depicted in figs. 1 and 2, in burner hearth primary zone, First air is fired from front-back wall vortex burner 1 and side wall simultaneously
Expect that spout 3 enters burner hearth, realize fuel-staged combustion, reduces NOx emission.Meanwhile the jet stream of side wall fuel nozzle ports 3 can effectively be prevented
Only front-back wall rotating jet is whitewashed a wall flowing in middle and lower reaches.Wherein, along furnace height direction, side wall fuel nozzle ports 3 and same
The height of layer front-back wall vortex burner 1 is the same；In the horizontal direction, side wall fuel nozzle ports 3 are located in side water wall
At the heart.In this example, front-back wall primary air velocity is 18m/s, and inner second air speed is 30m/s, and outer second air speed is 35m/s, combustion
Wind speed is 36m/s to the greatest extent, and side wall fuel nozzle ports wind speed is 24m/s or so.
In this example, the outlet of side wall fuel nozzle ports 3 uses rectangular jet, according to front-back wall vortex burner 1
The difference of case of fire, the depth-width ratio of spout is between 1.0~4.0.And side wall fuel nozzle ports 3 are penetrated in the aperture of furnace wall cooling
Stream can be swung in vertical direction and horizontal direction, and the flow angle that adjustable side wall fuel nozzle ports 3 export, Lai Youhua furnace
Interior burning tissues.
It finds after carrying out simulation transformation to this example, using the present invention, is reduced before the opposite transformation of the NOx emission of boiler
10% or so, and boiler top horizontal dust deposit in flue degree mitigates.
If when coal dust difference entrained by fuel and First air that side wall fuel nozzle ports 3 are added, such as biomass semicoke
With the mixture of coal, then it should ensure that be passed through coal dust required air quantity under its burn required air quantity and the same terms identical.It is practical
Process also found that addition biomass half is defocused in process of coal combustion, compared to low nitrogen fractional combustion, can be further reduced NOx
Discharge, and have the effect of reducing fine particle raw emissions.
Claims (5)
1. burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace, front-back wall eddy flow coal is arranged in boiler primary zone in this method
Separated-type over-fire-air nozzle (2) are arranged in burning-out zone in powder burner (1), and realization primary zone is fuel-rich combustion, and burning-out zone is richness
Oxygen burning, which is characterized in that the method is that side wall combustion is added on side wall at left and right sides of the primary zone of Pulverized Coal fired Boiler Furnace
Expect spout (3), required part of fuel of burning is injected directly into burner hearth by side wall fuel nozzle ports with pattern, with the front and back
Hot fume caused by wall vortex burner mixes combining combustion, remaining fuel yet by front-back wall vortex burner into
Enter burner hearth and burns；The fuel total calorific value being added in the same time from side wall fuel nozzle ports is boiler oil total calorific value
17%~30%；The fuel that side wall fuel nozzle ports spray into is coal, biomass, pyrolysis of coal semicoke, one in biomass pyrolytic semicoke
Kind or several combinations.
2. burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace according to claim 1, it is characterised in that: described
Side wall fuel nozzle ports are arranged symmetrically at left and right sides of the boiler furnace on side wall.
3. burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace according to claim 1 or 2, it is characterised in that:
The tune for adjusting side wall fuel nozzle ports jet exit velocity and air force is equipped in the inlet of each side wall fuel nozzle ports
Regulating device.
4. burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace according to claim 3, it is characterised in that: left and right
The number of plies of the side wall fuel nozzle ports (3) on furnace height direction on the side wall of two sides is 1-4 layers；Left and right sides side on the same layer
1-3 side wall fuel nozzle ports are respectively set on wall, when quantity is one, are located at side water wall center；When quantity is two
When a, it is located at side water wall center two sides symmetric position；When quantity is three, one is located at side water wall center
Place, other two is located at the symmetric position of side water wall center two sides.
5. burn method for organizing in a kind of opposed firing pulverized-coal fired boiler furnace according to claim 3, it is characterised in that: described
The outlet shapes of side wall fuel nozzle ports are rectangle or ellipse.
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| CN201710727086.1A CN107606601B (en) | 2017-08-23 | 2017-08-23 | A kind of interior method for organizing that burns of opposed firing pulverized-coal fired boiler furnace |
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| CN201710727086.1A CN107606601B (en) | 2017-08-23 | 2017-08-23 | A kind of interior method for organizing that burns of opposed firing pulverized-coal fired boiler furnace |
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| CN107606601B true CN107606601B (en) | 2019-07-12 |
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| CN109737390B (en) * | 2019-01-18 | 2020-07-28 | 清华大学 | Control method in gaseous mineral composition furnace generated by pulverized coal combustion |
| CN110274222A (en) * | 2019-07-12 | 2019-09-24 | 合肥工业大学智能制造技术研究院 | Burn method for arranging in a kind of opposite-flushing type oil burning boiler and its furnace |
| CN111550773A (en) * | 2020-04-17 | 2020-08-18 | 江联重工集团股份有限公司 | Large-capacity high-parameter gas boiler opposed-flushing type low-nitrogen oxide combustion power field |
| CN112902149B (en) * | 2021-02-07 | 2022-02-22 | 哈尔滨工业大学 | Combustion method of combustor with precombustion chambers arranged on two side walls of boiler |
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| CN106122944A (en) * | 2016-07-25 | 2016-11-16 | 杭州燃油锅炉有限公司 | A kind of pulverized-coal fired boiler |
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Patent Citations (5)
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| CN102297421A (en) * | 2011-06-27 | 2011-12-28 | 中国科学院过程工程研究所 | W-type flame decoupling combustion furnace and decoupling combustion method |
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| CN203656909U (en) * | 2013-12-05 | 2014-06-18 | 东方电气集团东方锅炉股份有限公司 | Front-rear wall type opposed firing boiler |
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