CN106016257A - Over-fire air arrangement method of opposite firing boiler - Google Patents
Over-fire air arrangement method of opposite firing boiler Download PDFInfo
- Publication number
- CN106016257A CN106016257A CN201610335920.8A CN201610335920A CN106016257A CN 106016257 A CN106016257 A CN 106016257A CN 201610335920 A CN201610335920 A CN 201610335920A CN 106016257 A CN106016257 A CN 106016257A
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- Prior art keywords
- burnout degree
- layer
- burner hearth
- over
- vertical
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
- F23L9/04—Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air beyond the fire, i.e. nearer the smoke outlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2201/00—Staged combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/10—Nozzle tips
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to an over-fire air arrangement method, and discloses an over-fire air arrangement method of an opposite firing boiler. The firing manner of the boiler is an opposite firing manner, wherein horizontal over-fire air (8) is arranged by layers and corresponding to each main firing device layer; the horizontal over-fire air (8) is blown into a hearth in a manner of obliquely intersecting with the firing flame direction in the layer; the horizontal over-fire air (8) in each layer is composed of four pieces of over-fire air, and each piece of over-fire air is divided into three parts, and the rigidity of the over-fire air is gradually increased along the firing flame direction; and a layer of vertical over-fire air (9) is arranged above the top firing flame in the hearth, and the layer of vertical over-fire air (9) is in the direction parallel to the firing flame direction. With the adoption of the over-fire air arrangement method of the opposite firing boiler, the high-temperature corrosion of water-cooling walls of sidewalls of the hearth can be effectively solved, and meanwhile, the emission of NOX can be reduced.
Description
Technical field
The present invention relates to a kind of burnout degree method for arranging, the burnout degree method for arranging of a kind of Opposite Firing Boiler.
Background technology
nullAt present，China 600MW、1000MW unit plant boiler generally uses opposed firing swirl flow combustion technology，And the boiler of hundreds of this kind of form that put into operation，Before and after these put into operation from the point of view of the ruuning situation of wall face-fired boiler，The properties of boiler all can reach to design requirement，And its to have low-load combustion-stabilizing strong、The advantages such as modulability is good，But this kind of burning boiler is the most only arranged above burnout degree at main burner layer，The burnout degree of this arrangement is it cannot be guaranteed that the coal dust in burner hearth is completely burned off under the effect of burner，In burner hearth, unburnt coal dust will move to burner hearth both walls，Cause and both walls water-cooling wall is washed away，Owing to coal dust containing element sulphur，Element sulphur generates Iron sulfuret. with the ferrum generation chemical reaction in side water wall，So that the wall thickness of water-cooling wall is thinning，Affect the safety of boiler operatiopn.nullLater stage is in order to solve the High Temperature Corrosion of burner hearth side water wall，The mode arranging adherent wind is generally used to solve，The arrangement of adherent wind is: before boiler furnace、Respectively close to a left side on rear wall、It is disposed with some laminating wall wind the positional symmetry of right both walls，By arranging that the adherent wind energy of this kind of mode strengthens the after-flame of the coal dust in burner hearth，Reduce the high temperature corrosion of both walls water-cooling wall to a certain extent，But owing to the stiff problem of the adherent wind of this kind of arrangement can not have been resolved，Make it not cover well and in the middle part of both walls, corrode heavier region，Side water wall High Temperature Corrosion can not be solved thoroughly，Additionally，Owing to the arrangement of adherent wind is: before boiler furnace、Respectively close to a left side on rear wall、The positional symmetry of right both walls is arranged，Make in the middle part of burner hearth, to lack wind the most serious，Affect the burning of coal dust，Cause NOXDischarge capacity higher.
Summary of the invention
The technical problem to be solved is to provide the burnout degree method for arranging of a kind of Opposite Firing Boiler, before and after have employed the burnout degree method for arranging of the present invention, wall face-fired boiler can efficiently solve side water wall High Temperature Corrosion, can also reduce NO simultaneouslyXDischarge.
The technical solution adopted for the present invention to solve the technical problems is: the burnout degree method for arranging of a kind of Opposite Firing Boiler, the combustion system of boiler is opposed firing burning, horizontal burnout degree is successively arranged corresponding to each main burner layer, the arrangement of nozzles of horizontal burnout degree is on a left side, in right both walls, horizontal burnout degree is blown in burner hearth with the wind direction being diagonal to this layer of combustion flame direction, the meaning of so-called oblique is the angle α that mutually adjacent horizontal burnout degree direction and main burner flame direction have acute angle, every burnout degree strengthens change step by step along its rigidity of combustion flame direction.
Further, every layer of horizontal burnout degree is made up of 4 burnout degree, described 4 burnout degree are blown into burner hearth in the position that corresponding main burner layer height is identical with the wind direction being diagonal to this layer of combustion flame direction near forward and backward wall respectively from burner hearth arranged on left and right sides wall, and every burnout degree is divided into again 3 strands of wind and strengthens change along its rigidity of combustion flame direction step by step.
Further, 3 strands of wind of every burnout degree are by being arranged on side by side three the nozzle ejections highly consistent with this layer of main burner, and the height of these 3 nozzles is identical, and width is gradually increased along combustion flame direction.
Further, it is arranged above one layer of vertical burnout degree in top layer combustion flame in burner hearth, the wind direction of this layer of vertical burnout degree is parallel with combustion flame direction and it blows to burner hearth center from the forward and backward wall of burner hearth respectively, and the air volume adjustment of vertical burnout degree is strong formal distribution weak with both sides along stove cross direction, middle.
Further, described vertical burnout degree is by adjacent two-layer vertical burnout degree nozzle ejection, and wherein upper vertical burnout degree nozzle quantity is less than lower vertical burnout degree nozzle quantity.
Further, the horizontal burnout degree number of plies being arranged in the main burner number of plies on the forward and backward wall of burner hearth and corresponding layout is 3 layers.
The invention has the beneficial effects as follows: before and after the present invention, the burnout degree method for arranging of wall face-fired boiler can efficiently solve burner hearth side water wall high temperature corrosion, NO can also be effectively reduced simultaneouslyXDischarge.
Accompanying drawing explanation
Fig. 1 is the structural representation of boiler furnace.
Fig. 2 is the front view of burner hearth.
Fig. 3 is the top view of horizontal burnout degree method for arranging.
Fig. 4 is the side view of vertical burnout degree method for arranging.
Figure is labeled as: 1-front wall, wall after 2-, the right wall of 3-, 4-vertical burnout degree nozzle, 5-horizontal burnout degree nozzle, 6-main burner, the left wall of 7-, the horizontal burnout degree of 8-, the vertical burnout degree of 9-.
Detailed description of the invention
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1 to 4, a kind of burnout degree method for arranging of the Opposite Firing Boiler of the present invention, the combustion system of boiler is opposed firing burning, boiler is Opposite Firing Boiler, boiler furnace be shaped as cuboid, horizontal burnout degree 8 is successively arranged in boiler furnace corresponding to each main burner layer, the arrangement of nozzles of horizontal burnout degree 8 is on arranged on left and right sides wall, horizontal burnout degree 8 is blown in burner hearth with the wind direction being diagonal to this layer of combustion flame direction, and every burnout degree strengthens change step by step along its rigidity of combustion flame direction.It is arranged above one layer of vertical burnout degree 9 in top layer combustion flame in burner hearth, the wind direction of this layer of vertical burnout degree 9 is parallel with combustion flame direction and it blows to burner hearth center from the forward and backward wall of burner hearth respectively, and the air volume adjustment of vertical burnout degree 9 is strong formal distribution weak with both sides along stove cross direction, middle.Horizontal burnout degree 8 number of plies being arranged in the main burner number of plies on the forward and backward wall of burner hearth and corresponding layout is 3 layers.
The present invention to implement process as follows:
As shown in Figure 1 to 4, first on the front wall 1 and rear wall 2 of Opposite Firing Boiler burner hearth, it is arranged symmetrically 3 layers of main burner layer, every layer has 5 main burners 6, then on the left side wall 7 and right-side wall 3 of burner hearth respectively close to its forward and backward wall positional symmetry arrange and 3 layers of main burner layer, 3 layers of horizontal burnout degree nozzle 5 one to one, arrangement for clearer explanation every layer horizontal burnout degree nozzle 5, now illustrating with the arrangement of the superiors' horizontal burnout degree nozzle 5, remaining arrangement of 2 layers is identical with this layer.nullThe horizontal burnout degree nozzle 5 being arranged in the superiors has 4 groups of burnout degree nozzles，It is left that these 4 groups of burnout degree nozzles are arranged in burner hearth、Respectively close to before it in right both walls、Rear wall and the position of the superiors' main burner layer sustained height，Aforesaid often group burnout degree nozzle is made up of 3 nozzles again，Nozzle be shaped as cuboid，These 3 nozzle side-by-side parallel are arranged，And make the flash of nozzle consistent with the flash of burner hearth，All it is blown in the middle part of burner hearth being diagonal to the wind direction in this layer of combustion flame direction under the effect of its guide plate respectively from 3 strands of wind of this 3 nozzles ejection，And these 3 strands of wind strengthen step by step along its rigidity of combustion flame direction，Oblique herein is the size according to burner hearth、The kinds of coal dust etc. are because usually determining the angle of oblique，Add described 3 strands of wind to strengthen step by step along its rigidity of combustion flame direction，Make 4 burnout degree can form bellows chamber in the case of drying at the same time and wrap up in coal dust，Can also be left at burner hearth、Both sides are formed weak in right both walls、The air volume adjustment of pulverized coal flame is caught up with in middle strong wind，Make thus strengthen the after-flame of coal dust，High temperature corrosion is caused so that coal dust unburnt in preventing burner hearth washes away both walls water-cooling wall，Side water wall High Temperature Corrosion can be efficiently solved，Also can reduce NO to a certain extent simultaneouslyXDischarge；Additionally, the horizontal burnout degree nozzle 5 of the present invention uses the nozzle with relatively large ratio of height to width, obviously, this depth-width ratio of nozzle is that kind of the size according to burner hearth and coal dust etc. is because usually determining, it is ensured that cover, from the after-flame wind energy of nozzle ejection, the combustion flame layer being adjacent after nozzle has higher height, simultaneously, in order to make 3 strands of wind from aforesaid 3 nozzles ejection strengthen step by step along its rigidity of combustion flame direction, on the premise of 3 nozzles have relatively large ratio of height to width, height by 3 nozzles of holding is constant, further along combustion flame direction the width of 3 nozzles is gradually increased and to realize.
nullThe front wall 1 and rear wall 2 of burner hearth 2 layers of vertical burnout degree nozzle 4 have been arranged symmetrically in the superiors' main burner layer appropriate position above，Wherein upper vertical burnout degree nozzle 4 is made up of 3 nozzles and it is positioned on same level line，Lower vertical burnout degree nozzle 4 is made up of 5 nozzles and it is positioned on same level line，Nozzle be shaped as cylindrical shape，On described、Lower two-layer neighboring vertical burnout degree nozzle 4 spacing distance is shorter，From upper、The wind direction of the vertical burnout degree 9 of lower two-layer vertical burnout degree nozzle 4 ejection is all parallel with combustion flame direction and it is respectively before burner hearth、Rear wall blows to burner hearth center，Due to upper、Lower two-layer neighboring vertical burnout degree nozzle 4 spacing distance is shorter，So the burnout degree from the ejection of this two-layer vertical burnout degree nozzle 4 can be considered as one layer of vertical burnout degree 9，The most this shorter spacing distance is that kind of the size according to burner hearth and coal dust etc. is because usually determining，Furthermore，Upper vertical burnout degree nozzle has 3 nozzles，Lower vertical burnout degree nozzle has 5 nozzles，So it is that both sides are weak that the vertical burnout degree of this layer 9 has along stove cross direction、Middle strong air volume adjustment，So can guarantee that there is in the middle part of burner hearth enough air volume adjustment，Thus efficiently solve the problem lacking wind in the middle part of burner hearth，Strengthen the burning of coal dust further，Thus reduce NOXDischarge, simultaneously, the part burnout degree being distributed in its both sides in this layer of vertical burnout degree 9 is effectively supplementing horizontal burnout degree, make horizontal burnout degree 8 and vertical burnout degree 9 can enter burner hearth from left and right side and the top of burner hearth respectively, to ensure the multidimensional deeply staged combustion to coal dust, thus reduce NO furtherXDischarge.
Claims (6)
1. the burnout degree method for arranging of an Opposite Firing Boiler, the combustion system of boiler is opposed firing burning, it is characterized in that: successively arrange horizontal burnout degree (8) corresponding to each main burner layer, the arrangement of nozzles of horizontal burnout degree (8) is on arranged on left and right sides wall, horizontal burnout degree (8) is blown in burner hearth with the wind direction being diagonal to this layer of combustion flame direction, and every burnout degree strengthens change step by step along its rigidity of combustion flame direction.
2. the burnout degree method for arranging of Opposite Firing Boiler as claimed in claim 1, it is characterized in that: every layer of horizontal burnout degree (8) is made up of 4 burnout degree, described 4 burnout degree are blown into burner hearth in the position that corresponding main burner layer height is identical with the wind direction being diagonal to this layer of combustion flame direction near forward and backward wall respectively from burner hearth arranged on left and right sides wall, and every burnout degree is divided into again 3 strands of wind and strengthens change along its rigidity of combustion flame direction step by step.
3. the burnout degree method for arranging of Opposite Firing Boiler as claimed in claim 2, it is characterized in that: 3 strands of wind of every burnout degree are by being arranged on side by side three the nozzle ejections highly consistent with this layer of main burner, the height of these 3 nozzles is identical, and width is gradually increased along combustion flame direction.
4. the burnout degree method for arranging of Opposite Firing Boiler as claimed in claim 1 or 2, it is characterized in that: in burner hearth, be arranged above one layer of vertical burnout degree (9) in top layer combustion flame, the wind direction of the vertical burnout degree of this layer (9) is parallel with combustion flame direction and it blows to burner hearth center from the forward and backward wall of burner hearth respectively, and the air volume adjustment of vertical burnout degree (9) is strong formal distribution weak with both sides along stove cross direction, middle.
5. the burnout degree method for arranging of Opposite Firing Boiler as claimed in claim 4, it is characterized in that: described vertical burnout degree (9) is by adjacent two-layer vertical burnout degree nozzle (4) ejection, and wherein upper vertical burnout degree nozzle (4) quantity is less than lower vertical burnout degree nozzle (4) quantity.
6. the burnout degree method for arranging of Opposite Firing Boiler as claimed in claim 2, it is characterised in that: horizontal burnout degree (8) number of plies being arranged in the main burner number of plies on the forward and backward wall of burner hearth and corresponding layout is 3 layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610335920.8A CN106016257B (en) | 2016-05-20 | 2016-05-20 | A kind of burnout degree method for arranging of Opposite Firing Boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610335920.8A CN106016257B (en) | 2016-05-20 | 2016-05-20 | A kind of burnout degree method for arranging of Opposite Firing Boiler |
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| CN106016257A true CN106016257A (en) | 2016-10-12 |
| CN106016257B CN106016257B (en) | 2017-12-12 |
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| CN201610335920.8A Active CN106016257B (en) | 2016-05-20 | 2016-05-20 | A kind of burnout degree method for arranging of Opposite Firing Boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989411A (en) * | 2017-04-12 | 2017-07-28 | 西安热工研究院有限公司 | A kind of boiler water wall air film protection device |
| CN109114588A (en) * | 2018-08-31 | 2019-01-01 | 华北水利水电大学 | It is pure to fire high-alkali coal wet bottom boiler low NOx combustion system and method for controlling combustion |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989411A (en) * | 2017-04-12 | 2017-07-28 | 西安热工研究院有限公司 | A kind of boiler water wall air film protection device |
| CN106989411B (en) * | 2017-04-12 | 2024-01-19 | 西安热工研究院有限公司 | Boiler water-cooled wall air film protection device |
| CN109114588A (en) * | 2018-08-31 | 2019-01-01 | 华北水利水电大学 | It is pure to fire high-alkali coal wet bottom boiler low NOx combustion system and method for controlling combustion |
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| Publication number | Publication date |
|---|---|
| CN106016257B (en) | 2017-12-12 |
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