CN102913898B - Over-fire air distribution manner in front and back wall opposed firing boiler - Google Patents

Over-fire air distribution manner in front and back wall opposed firing boiler Download PDF

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Publication number
CN102913898B
CN102913898B CN201210390169.3A CN201210390169A CN102913898B CN 102913898 B CN102913898 B CN 102913898B CN 201210390169 A CN201210390169 A CN 201210390169A CN 102913898 B CN102913898 B CN 102913898B
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boiler
burnout degree
over
fire air
burnout
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CN201210390169.3A
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Chinese (zh)
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CN102913898A (en
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但家瑜
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东方电气集团东方锅炉股份有限公司
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Abstract

The invention discloses an over-fire air distribution manner in a front and back wall opposed firing boiler; a boiler firing method is in the form of front and back wall opposed firing, and over-fire air is fed by using a tangent circle method. The front and back wall opposed firing boiler comprises a front and back wall opposed firing boiler; with a symmetric central line of a long edge of the boiler as boundary, the over-fire air is divided into two groups; 4-5 over-fire air nozzles are arranged in each group; central lines of the over-fire air sprayed by the over-fire air nozzles in each group are tangential to the same imaginary ellipse; rotation directions of the ellipses in the two groups are reverse to each other; and one ellipse rotates in an anticlockwise direction and the other ellipse rotates in a clockwise direction. The over-fire air is high speed direct current over-fire air; and the over-fire air nozzles swing up and down and from left to right in a full-swinging form. The over-fire air distribution manner in the front and back wall opposed firing boiler, disclosed by the invention, is beneficial for enhancing the mixing of the over-fire air and rising flue gas and increasing the travel of the flue gas and prolonging the staying time of a fuel in the oven, and has the advantages that NOx emission of the boiler is obviously reduced and the increase of carbon content in boiler fly ash and the increase of the temperature-reduction water quantity are effectively suppressed.

Description

A kind of burnout degree arrangement in Opposite Firing Boiler
Technical field
The present invention relates to a kind of burnout degree arrangement, particularly relate to a kind of burnout degree arrangement adopting two circle of contact feeding mode in Opposite Firing Boiler, belong to station boiler low-NO_x combustion technology field.
Background technology
At present, in large-scale pulverized coal firing boiler, the main combustion system adopted has Terms of Corner Tangential Combustion and opposed firing combustion system.
In Terms of Corner Tangential Combustion, tangent from air-flow (fuel and the air distribution) axis of parallel flow burner ejection and one or more imaginary circle at burner hearth center that are arranged in burner hearth corner, the flue gas of the flame that burning is formed and generation rotates rising, corner flame interaction formation one is large on furnace profile " fireball " in burner hearth.This combustion system has the advantages that in stove, global tissue air distribution, flame are supported mutually, and possesses the advantage that gas and vapor permeation is strong, flue gas stroke is longer, the furnace profile approximating square of this burning pattern.
In opposed firing combustion system, circular cyclone burner arrangement on burner hearth front wall and rear water wall, on front-back wall quantity equity burner in respectively have a burner to be positioned on same axis, each burner organizes separately air distribution, flame relatively independent; Do not interfere with each other between each stock flame on same face wall, be folded to after the flame afterbody of two burners on front-back wall on same axis liquidates in the middle part of burner hearth and upwards flow.This combustion system has the comparatively uniform advantage of heat load distribution on furnace profile, but, under same burner hearth after-flame height compared with Terms of Corner Tangential Combustion, the inner flue gas of the stove later stage mixing of this opposed firing combustion system is poor, flue gas stroke is relatively short, if combustion air can not feed in time and fully mix with fuel, then can postpone the combustion process of fuel and affect burner hearth heat absorption, the furnace profile of this burning pattern is rectangle, and length-width ratio is larger.
Burning pattern and fuel, boiler shape are relevant with other several factors, determine at the design initial stage, and boiler is difficult to after building up operation again to the change that its pattern of burning is carried out fundamentally.
The burning of coal can produce a large amount of oxides of nitrogen gas, and the discharge of nitrogen oxide can cause the severe contamination of atmospheric environment; At present, the conventional coal-fired power station boiler NO of existing control xthe measure of discharge is mainly divided into low NO xcombustion technology and flue gases purification; Wherein, low NO xcombustion technology is invested, operating cost is few, can reduce NOx emission concentration 40% ~ 60%; And flue gases purification denitration efficiency is high, but initial cost and operating cost high.Boiler NO xthe minimizing of growing amount significantly can reduce investment and the operating cost of the out of stock device of afterbody, therefore controls coal-fired boiler NOx discharge amount and all first will adopt NO xcombustion technology or carry out low NOx combustion transformation.
For meeting the environmental requirement of increasingly stringent, the boiler of many earlier operation all has the transformation requirement of low nitrogen burning, these boilers to be mainly subcritical tangentially-fired boiler, subcritical Opposite Firing Boiler and subcritical " W " type flame combustion boiler; For reducing the NOx discharge of early stage boiler, above former burner, set up burnout degree has become the effective means and important means that generally adopt.At present, the boiler of Terms of Corner Tangential Combustion increases the mode that burnout degree still adopts the circle of contact to send into newly, and opposed firing combustion system boiler increases the mode that burnout degree still adopts opposed firing to send into newly.
Set up burnout degree above former burner after, primary zone, bottom wind supply quantity reduces, the air delay in supply namely burning required, causes coal powder ignition and after-flame to postpone.For improvement project, due to furnace height and former burner arrangement invariant position, and the after-flame space of fuel, namely corresponding newly-increased burnout degree also can reduce to the distance of furnace outlet, under the acting in conjunction of above-mentioned two factors, low nitrogen burning transformation can cause increase and the curtain wall overtemperature of tube wall of furnace outlet gas temperature, boiler spray water flux and unburned carbon in flue dust, has an impact to the security and economy of transforming rear boiler operatiopn when these change greatly.Tangentially-fired boiler is because the mixing of flue gas later stage is strong, flue gas stroke is relatively long, and therefore these changes are rear and not obvious in low nitrogen burning transformation; But for Opposite Firing Boiler, because the mixing of flue gas later stage is poor, flue gas stroke is relatively short, these changes seem outstanding especially after newly-increased burnout degree adopts opposed firing to send into the low nitrogen burning transformation of mode, and have become the larger technology barrier of this type boilers low nitrogen burning transformation.
Although industry has done excessive quantifier elimination and many trials to subcritical Opposite Firing Boiler by the increase that can reduce boiler spray water flux and unburned carbon in flue dust while setting up burnout degree and reducing emission of NOx of boiler amount, but the means taked all are confined to the partial structurtes of former burner with on the air distribution of local, but these trials produce little effect, even if unburned carbon in flue dust can be reduced and boiler spray water flux is also sacrifice NOx emission for cost.
Therefore, also do not have a kind of effective mode to occur at present, effectively can solve the technical barrier existed at present.
Summary of the invention
The object of the invention is to: propose a kind ofly in Opposite Firing Boiler, to adopt two burnout degree layout pattern cutting oval feeding mode, the special low nitrogen burning for Opposite Firing Boiler rectangle burner hearth is transformed and establishes, solve in the low nitrogen burning transformation process of early stage subcritical Opposite Firing Boiler, opposed firing is adopted to send into the mode of burnout degree, because the mixing of its flue gas later stage is poor, flue gas stroke is relatively short, low nitrogen burning is caused to transform rear hearth outlet cigarette temperature, boiler spray water flux and unburned carbon in flue dust increase and curtain wall overtemperature of tube wall, to the technical problem that boiler operatiopn security and economy after transformation have a negative impact.
The object of the invention is realized by following technical proposals: a kind of burnout degree arrangement in Opposite Firing Boiler, and boiler combustion mode is opposed firing burning pattern, and burnout degree adopts circle of contact mode to send into.
As a kind of preferred embodiment, the boiler of described opposed firing burning pattern comprises Opposite Firing Boiler, and described boiler furnace is rectangle, and with boiler long limit symmetrical center line for described burnout degree is divided into two groups by boundary, often group is provided with 4-5 burnout degree nozzle; Burnout degree adopts circle of contact mode to send into and refers to: often organize burnout degree nozzle injection burnout degree center line oval tangent with same imagination, and the direction of rotation of two groups of ellipses is on the contrary, one for being rotated counterclockwise, another is for turning clockwise.
As preferred further, described burnout degree is High-speed DC formula burnout degree, and burnout degree nozzle adopts full swing pattern that is upper and lower, that swing.
As further preferably, in boiler furnace, be provided with several layers of coal burner, burnout degree be located at be positioned at top layer coal burner center line on.
As preferred further, burnout degree is located at 6m-7m place on top layer coal burner center line, and its wind rate is 25% ~ 30%, and spout outlet place wind speed is 60m/s ~ 70m/s.
As preferred further, after boiler, wall burnout degree absolute altitude region, boiler centerline are furnished with adherent wind.
As further preferably, the porch of each burnout degree is provided with air door controllable register and actuator.
As further preferably, each burnout degree air channel arranges the wind measuring device being used for test access wind speed.
Formation basic theory of the present invention is: on the rectangle burner hearth four sides wall on former Opposite Firing Boiler coal burner, employing pair is cut oval feeding mode and arranged burnout degree, burnout degree is single flow, with boiler symmetrical center line for boundary is divided into two groups, an imagination in the burnout degree air-flow axis often organized and burner hearth is oval tangent, direct current burnout degree at a high speed drives rising flue gas in stove to rotate, burnout degree is stronger with mixing of rising flue gas, mixing uniformity remarkable improvement compared with traditional burnout degree arrangement, add the stroke of flue gas in stove because flue gas rotates to rise simultaneously, thus also add the time of staying of fuel in stove, be conducive to after-flame and the burner hearth heat absorption of coal dust, the rising of furnace outlet gas temperature and desuperheating water of superheater amount can be suppressed.
Compared with prior art, beneficial effect of the present invention: the burnout degree adopting the circle of contact to send into mode in Opposite Firing Boiler is arranged, can obtain following beneficial effect:
1. significantly reduce the expense of emission of NOx of boiler amount and blowdown generation, there is good Social benefit and economic benefit.
2. obviously improve the mixing uniformity of burnout degree and rising flue gas, be conducive to the combustion velocity improving uncombusted coal dust;
3. when furnace height is constant, flue gas stroke and the time of staying of uncombusted coal dust in stove can be increased, be conducive to the after-flame of coal dust and increase burner hearth heat absorption, suppress the increase of boiler spray water flux, prevent curtain wall coking and overtemperature of tube wall, thus the security of boiler operatiopn after ensureing low nitrogen burning transformation and economy;
4. can regulate the hybrid position of burnout degree air quantity, burnout degree and rising flue gas and the size of the burnout degree circle of contact and position easily, boiler is in operation can at reduction boiler NO xdischarge capacity, between unburned carbon in flue dust and boiler spray water flux, obtain best resultant effect, and can prevent high-temperature flue gas from washing away water-cooling wall, reduce the furnace outlet both sides gas temperature windage because flue gas residual rotation causes.
5. furnace flame degree of filling is better, and on furnace profile, heat load distribution is more even, is conducive to the safe operation of boiler water cycle and water-cooling wall pipe.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of burnout degree arrangement of the present invention;
Fig. 2 is burnout degree structural representation of the present invention;
Fig. 3 is the overlooking surface structural representation of Fig. 2;
Fig. 4 is the flue gas flow field figure on furnace outlet elevation location furnace profile.
Wherein 1-boiler furnace, 2-burnout degree nozzle, 3-, 5-air door controllable register oval from the center line of burnout degree nozzle injection burnout degree, 4-imagination and actuator, 6-wind measuring device.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
All features disclosed in this description, or the step in disclosed all methods or process, except the speciality mutually repelled and/or step, all can combine by any way, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object, namely, unless specifically stated otherwise, an embodiment in a series of equivalence of each feature or similar characteristics.
As Figure 1-3, a kind of burnout degree arrangement in Opposite Firing Boiler, boiler combustion mode is opposed firing burning pattern, and burnout degree adopts circle of contact mode to send into.The boiler of described opposed firing burning pattern comprises Opposite Firing Boiler, and described boiler furnace 1 is rectangle, and with boiler long limit symmetrical center line for described burnout degree is divided into two groups by boundary, often group is provided with 4-5 burnout degree nozzle 2; Burnout degree adopts circle of contact mode to send into and refers to: often organizing burnout degree nozzle 2, to penetrate burnout degree center line 3 and same imagination oval 4 tangent, and the direction of rotation of two groups of ellipses is contrary, one for being rotated counterclockwise, another is for turning clockwise; Described burnout degree is High-speed DC formula burnout degree, and burnout degree nozzle 2 adopts up and down, the full swing pattern that swings; This full swing form is mainly by arranging horizontal hunting structure 21 at the spout of nozzle and vertical oscillation mechanism 22 realizes, as a rule, the spout of burnout degree nozzle is adopted to be all only single level or single vertical oscillation in plain cylindrical furnace, in the present invention, adopt up and down, the uniformity that form that left and right swings entirely mixes after can increasing air intake.This burnout degree arrange position and requirement be: be provided with several layers of coal burner in boiler furnace, burnout degree be located at be positioned at top layer coal burner center line on; Burnout degree is located at 6m-7m place on top layer coal burner center line, and its wind rate is 25% ~ 30%, and spout outlet place wind speed is 60m/s ~ 70m/s.After boiler, wall burnout degree absolute altitude region, boiler centerline are furnished with adherent wind; Air door controllable register and actuator 5 is provided with in the porch of each burnout degree; Each burnout degree air channel arranges the wind measuring device 6 being used for test access wind speed.
Specific implementation process of the present invention is as follows:
On former burner suitable distance place burner hearth four sides wall on arrange burnout degree, burnout degree is single flow, one or two imaginary circle in each burnout degree air-flow axis direction and burner hearth is tangent, because the burner hearth length-width ratio of Opposite Firing Boiler is larger, for realizing the reasonable Arrangement of burnout degree, imaginary circle adopts oval.When furnace profile size is larger, for ensure as far as possible burnout degree and rising flue gas Homogeneous phase mixing, improve burner hearth Flame full level and make heat load distribution on furnace profile more even, whole burner hearth can be divided into two to cut elliptic region; Also help the furnace outlet both sides gas temperature windage reduced because flue gas residual rotation causes like this.
embodiment 1:
Example is transform as with the low nitrogen burning of the subcritical Opposite Firing Boiler of certain 600MW.
First, on the superiors' coal burner center line, the position of 6m increases one deck burnout degree newly, and the wind rate of this burnout degree controls to be 25%.
This layer of burnout degree sprays by 10 burnout degree nozzle vent 10 burnout degree formed and forms, the setting position of these 10 nozzle vent is: 10 nozzles are divided into two groups, often organize 5, the spout often organizing burnout degree keeps at a certain distance away setting, and the centerline direction of spout can be tangential on certain imaginaryly cuts ellipse.During concrete enforcement, the concrete position of these 10 nozzle vent and angle finally determine in conjunction with numerical simulation calculation result according to the concrete structure of boiler, its position arranged ensure that suitable circle of contact size and position, ensure that flue gas has enough spin intensities, furnace outlet gas temperature meets the demands, on furnace profile, cigarette temperature is evenly distributed simultaneously, and high-temperature flue gas is not whitewashed a wall.The arrangement employing two arrangement of cutting ellipse of burnout degree on furnace profile that 10 nozzle vent are formed, and, two ELLIPTIC REVOLUTION directions are contrary, one for being rotated counterclockwise, one for turning clockwise, to ensure that two swirling eddies can not disturb mutually in burner hearth central area, the air-flow after its formation as shown in Figure 4.
Burnout degree adopts High-speed DC wind pattern, and spout outlet place design wind speed is 65m/s, ensure that burnout degree has enough momentum and rising flue gas can be driven to rotate.
For regulating the hybrid position of burnout degree and rising flue gas, all fire air nozzle all can vertical oscillation up and down; For regulating burnout degree to cut oval size and position, all fire air nozzle all can horizontal hunting; Ensure that burnout degree is in operation and has enough regulating measures, makes boiler operatiopn be in best comprehensive state.
Each burnout degree porch arranges air door controllable register and baffle plate actuator, and air quantity is regulated by damper aperture, each burnout degree air channel is arranged the wind measuring device being used for test access wind speed, ensures that the air quantity of each burnout degree is adjustable separately.Reducing emission of NOx of boiler amount, unburned carbon in flue dust, boiler spray water flux and preventing from high-temperature flue gas from washing away water-cooling wall and reduce between the furnace outlet both sides gas temperature windage that causes due to flue gas residual rotation etc. obtaining best resultant effect when these regulating measures are conducive to boiler operatiopn.
Therefore, this novel burnout degree arrangement not only can be used for the low nitrogen burning transformation of early stage opposed firing combustion system boiler, also can be used in the design of the new boiler adopting opposed firing combustion system.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. the burnout degree arrangement in Opposite Firing Boiler, is characterized in that: boiler combustion mode is opposed firing burning pattern, and burnout degree adopts circle of contact mode to send into; The boiler of described opposed firing burning pattern comprises Opposite Firing Boiler, and described boiler furnace is rectangle, and with boiler long limit symmetrical center line for described burnout degree is divided into two groups by boundary, often group is provided with 4-5 burnout degree nozzle; Burnout degree adopts circle of contact mode to send into and refers to: often organize burnout degree nozzle injection burnout degree center line oval tangent with same imagination, and the direction of rotation of two groups of ellipses is on the contrary, one for being rotated counterclockwise, another is for turning clockwise.
2. the burnout degree arrangement in Opposite Firing Boiler as claimed in claim 1, is characterized in that: described burnout degree is High-speed DC formula burnout degree, and burnout degree nozzle adopts full swing pattern that is upper and lower, that swing.
3. burnout degree arrangement in Opposite Firing Boiler as claimed in claim 2, is characterized in that: be provided with several layers of coal burner in boiler furnace, burnout degree be located at be positioned at top layer coal burner center line on.
4. the burnout degree arrangement in Opposite Firing Boiler as claimed in claim 3, it is characterized in that: burnout degree is located at 6m-7m place on top layer coal burner center line, its wind rate is 25% ~ 30%, and spout outlet place wind speed is 60m/s ~ 70m/s.
5. the burnout degree arrangement in Opposite Firing Boiler as described in claim arbitrary in claim 1-4, is characterized in that: after boiler, wall burnout degree absolute altitude region, boiler centerline are furnished with adherent wind.
6. the burnout degree arrangement in Opposite Firing Boiler as described in claim arbitrary in claim 1-4, is characterized in that: the porch of each burnout degree is provided with air door controllable register and actuator.
7. the burnout degree arrangement in Opposite Firing Boiler as described in claim arbitrary in claim 1-4, is characterized in that: on each burnout degree air channel, arrange the wind measuring device being used for test access wind speed.
CN201210390169.3A 2012-10-16 2012-10-16 Over-fire air distribution manner in front and back wall opposed firing boiler CN102913898B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104696950B (en) * 2013-12-06 2017-09-12 烟台龙源电力技术股份有限公司 A kind of W flame boiler with multigroup fire air nozzle
CN104990069B (en) * 2015-07-10 2017-12-22 西安热工研究院有限公司 A kind of combustion system for improving Opposite Firing Boiler security and economy
CN106016257B (en) * 2016-05-20 2017-12-12 东方电气集团东方锅炉股份有限公司 A kind of burnout degree method for arranging of Opposite Firing Boiler

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Publication number Priority date Publication date Assignee Title
JP2731794B2 (en) * 1990-10-31 1998-03-25 コンバッション エンヂニアリング インコーポレーテッド High performance overfire air system for NOx control
US5809910A (en) * 1992-05-18 1998-09-22 Svendssen; Allan Reduction and admixture method in incineration unit for reduction of contaminants
CN100387902C (en) * 2006-02-21 2008-05-14 西安热工研究院有限公司 Novel three-region two-stage overfire air arrangement mode for wall type boiler
CN101793394A (en) * 2010-03-31 2010-08-04 哈尔滨工业大学 Symmetric double-tangential circular single-furnace pulverized coal combustion device
CN102588956A (en) * 2012-03-15 2012-07-18 北京志源恒通科技有限公司 Novel rotational flow impact boiler and manufacturing method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2731794B2 (en) * 1990-10-31 1998-03-25 コンバッション エンヂニアリング インコーポレーテッド High performance overfire air system for NOx control
US5809910A (en) * 1992-05-18 1998-09-22 Svendssen; Allan Reduction and admixture method in incineration unit for reduction of contaminants
CN100387902C (en) * 2006-02-21 2008-05-14 西安热工研究院有限公司 Novel three-region two-stage overfire air arrangement mode for wall type boiler
CN101793394A (en) * 2010-03-31 2010-08-04 哈尔滨工业大学 Symmetric double-tangential circular single-furnace pulverized coal combustion device
CN102588956A (en) * 2012-03-15 2012-07-18 北京志源恒通科技有限公司 Novel rotational flow impact boiler and manufacturing method thereof

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