CN208832441U - The swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement - Google Patents
The swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement Download PDFInfo
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- CN208832441U CN208832441U CN201821305053.4U CN201821305053U CN208832441U CN 208832441 U CN208832441 U CN 208832441U CN 201821305053 U CN201821305053 U CN 201821305053U CN 208832441 U CN208832441 U CN 208832441U
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Abstract
The utility model provides one kind and can be improved efficiency of combustion, inhibits NOx generation amount, while can improve the swirl flow combustion boiler that liquidates in boiler flue temperature field and flow field.The swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement, the burner hearth (1) of swirl flow combustion boiler of liquidating includes front wall (2), rear wall (3), left side wall (9), right-side wall (10), the main burner (4) of swirl flow combustion mode is arranged on front wall, rear wall, two layers of fire air nozzle group is arranged above main burner, for two layers of fire air nozzle group arrangement height in the vertical direction at a distance of 1-2 meters, all spouts of every layer of fire air nozzle group are located at same level height；Every layer of fire air nozzle quantity is four or eight, and the center line of every layer of four fire air nozzle forms an imaginary circle；The direction of rotation of upper and lower level imaginary circle is opposite: the direction of rotation of two imaginary circles of same layer is on the contrary, the direction of rotation of the corresponding imaginary circle of upper and lower level is also opposite.
Description
Technical field
The utility model belongs to steam power plant field, is related to one kind and liquidates swirl flow combustion boiler, more particularly, to right
Rush swirl flow combustion boiler combustion exhausted wind arrangement.
Background technique
Opposite Firing Boiler is with its advantage in terms of combustion apparatus and heating surface arrangement, in China's active service unit
In occupy very big ratio, the generation that air staged combustion technology inhibits nitrogen oxide NOx is widely used in the type boiler.Air
Grading combustion technology has many advantages, such as that investment low with operating cost, technology maturation, emission reduction effect are obvious, to reduce coal unit drop
The mainstream technology means of low NOx.
This method principle are as follows: burner hearth is divided into 2-3 relatively independent combustion zones, burning required air quantity point on longitudinal direction
Two-stage is sent into burner hearth: the first order accounts for 70 ~ 80% or so of theoretical air requirement from the air capacity that main burner is sent into burner hearth, makes fuel
It first burns under conditions of anoxic, fuel-rich, the generation of NOx is reduced using reducing atmosphere；The second level is by being arranged in main combustion
Surplus air is sent into burner hearth by the fire air nozzle above burner, and whole combustion processes are finally completed under excess oxygen.Air
Grading combustion technology can make the concentration of emission of NOx reduce by 20% ~ 50%, realize efficient, economic, the environmentally friendly operation of boiler.
Currently, the burnout degree arrangement of opposed firing swirl flow combustion boiler are as follows: above the main burner of forward and backward wall
Certain altitude respectively arranges one layer of burnout degree, and the quantity of fire air nozzle is identical as the quantity of every layer of main burner, and nozzle exit area
Correspond the spout in main burner.However find in operation, such burnout degree arrangement has some limitations,
It shows:
(1) since burnout degree pattern is opposed firing mode, this makes fluid field in furnace in the turbulent flow of burner hearth transverse direction
Disturbance is insufficient, causes the oxygen of uncompleted burned carbon and CO and burnout degree poor in burner hearth empir-ical formulation effect, and burning is uneven, leads to flying dust
Phosphorus content is high, reduces the efficiency of combustion of boiler；
(2) inhomogeneities burnt extends to back-end ductwork by upper furnace along the direction of flue gas, so that shielding in furnace, being high
Cross, the high heating surfaces such as again absorb heats unevenness on boiler width direction, there is the phenomenon that thermal deviation, lead to spray water flux height and office
Portion's wall temperature of heated surface overtemperature, the economy of unit and safety decline；
(3) flue gas flow field caused by the inhomogeneities burnt is unevenly distributed, and also results in oxygen at furnace exit, CO, smoke temperature
What is be distributed is uneven, not can guarantee the accuracy of boiler controller system operation measuring point institute monitoring parameters, and influence technique personnel fire boiler
The diagnostic analysis of burning situation.
In conclusion the burnout degree arrangement of existing Opposite Firing Boiler is caused by the flow field of after-flame stratification of wind
Turbulent perturbation is insufficient, empir-ical formulation effect is poor, will lead to low boiler combustion efficiency, heating surface thermal deviation, furnace outlet flow field point
The problems such as cloth is uneven reduces the safety and economy of boiler operatiopn.
Summary of the invention
Purpose of the utility model is to solve defects existing in the prior art, and providing one kind can be improved burning effect
Rate inhibits NOx generation amount, while can improve the swirl flow combustion boiler that liquidates in boiler flue temperature field and flow field.
In order to achieve the above object, the specific technical solution that the utility model uses is as follows:
A kind of swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement, burner hearth (1) packet of the swirl flow combustion boiler that liquidates
Front wall (2), rear wall (3), left side wall (9), right-side wall (10) are included, the main burning of swirl flow combustion mode is arranged on front wall, rear wall
Device (4) arranges two layers of fire air nozzle group above main burner, and two layers of fire air nozzle group arrangement height is in vertical side
Upwards at a distance of 1-2 meters, all spouts of every layer of fire air nozzle group are located at same level height；
Unit grade of the quantity of spout depending on the swirl flow combustion boiler that liquidates in fire air nozzle group, when the eddy flow combustion that liquidates
When burning boiler is 300MW grade, burner hearth cross section is substantially square, and every layer of fire air nozzle quantity is four, is respectively arranged
On 4 face wall of burner hearth, the center line of four fire air nozzles is arranged in the wall circle of contact, the center line of every layer of four fire air nozzle
Form an imaginary circle；The direction of rotation of upper and lower level imaginary circle is opposite；
When the swirl flow combustion boiler that liquidates is 600MW and ratings above, burner hearth cross section is about that rectangle is (long up to 28
It is rice, wide up to 15 meters), every layer of fire air nozzle quantity is eight, it is arranged on boiler front-back wall, eight fire air nozzles
Center line is in double circle of contact arrangements, and the center line of every layer of eight fire air nozzle forms two imaginary circles；Two imaginations of same layer
The direction of rotation of the circle of contact is on the contrary, the direction of rotation of the corresponding imaginary circle of upper and lower level is also opposite.
When fire air nozzle quantity is four, four fire air nozzles, which are respectively perpendicular, is arranged in burner hearth front wall, rear wall, left side
On wall and right-side wall.
Lower layer's fire air nozzle (5) and upper layer fire air nozzle when fire air nozzle quantity is four, on same furnace wall
It (6) is to be staggered in arrangement.
The fire air nozzle of each arranged tangential is mounted on swing mechanism, can carry out the pendulum of horizontal direction and vertical direction
It is dynamic, to control the size that jet stream burnout degree is formed by imaginary circle, to control the mixed process of Furnace Aerodynamic Field.
The jet stream burnout degree that every 4 fire air nozzles spray into burner hearth forms an imaginary circle of contact, the circle of contact above burner hearth
Direction of rotation be clockwise or counterclockwise, but up and down and the direction of rotation of two imaginary circles of left and right arbitrary neighborhood is phase
Anti-.
It is described in the utility model to liquidate swirl flow combustion boiler compared with prior art, it has the advantage that
(1) the utility model liquidate swirl flow combustion layout of boiler have 2 layers of jet stream circle of contact flow burnout degree, increase after-flame
The coverage area of stratification of wind, this coal dust for making primary zone uncombusted, which is rotated with flue gas in upper furnace, to be risen, and coal dust is in burner hearth
Stroke and the residence time extended, and with the oxygen in burnout degree obtained it is good mix, be capable of increasing the combustion of coal dust
Rate inhibits the generation of NOx to improve the efficiency of combustion of boiler to the greatest extent, improves the economy of unit.
(2) the utility model liquidates burnout degree adjacent two-by-two in swirl flow combustion boiler with the imaginary circle cloth of opposite rotation direction
It sets, the residual rotation that the flowing of the burnout degree circle of contact causes furnace outlet flue gas, while flue gas flow field and temperature field can be effectively prevented
Through the sufficient turbulent perturbation of after-flame stratification of wind, significantly improves from the serious uneven distribution in primary zone, make furnace outlet
Below the flue gas flow field and pendant superheater of flue the thermo parameters method of section of burner hearth more evenly, the face thermal deviation that keeps from heat and
The safety of local wall overheating problem, boiler operatiopn is improved.
(3) fire air nozzle of swirl flow combustion boiler of liquidating can carry out the swing of horizontal direction and vertical direction, pass through tune
The swinging angle control jet stream burnout degree of section spout is formed by the size of imaginary circle, to control the mixing of Furnace Aerodynamic Field
Process, flame kernel height improve flue gas in the degree of filling of upper furnace, so that it is more advantageous to burning, prevent heating surface steam temperature
It transfinites, reduce NOx emission and reduce coking, by the corrective action to burning, can flexibly realize negative for different types of coal, difference
The runing adjustment performance of lotus variation.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the swirl flow combustion boiler that liquidates of 300MW grade burnout degree circle of contact arrangement；
Fig. 2 is the schematic perspective view of the swirl flow combustion boiler that liquidates of 300MW ratings above burnout degree circle of contact arrangement；
Fig. 3 be 300MW grade liquidate swirl flow combustion combusting boiler lower layer fire air nozzle group be in the wall circle of contact arrangement structure
Schematic diagram；
Fig. 4 be 300MW grade liquidate swirl flow combustion combusting boiler upper layer fire air nozzle group be in the wall circle of contact arrangement structure
Schematic diagram；
Fig. 5 be 600MW grade liquidate swirl flow combustion combusting boiler lower layer fire air nozzle group be in the wall circle of contact arrangement structure
Schematic diagram；
Fig. 6 be 600MW grade liquidate swirl flow combustion combusting boiler upper layer fire air nozzle group be in the wall circle of contact arrangement structure
Schematic diagram；
In figure: 1- burner hearth；2- front wall；Wall after 3-；4- main burner；5- lower layer fire air nozzle；The spray of the upper layer 6- burnout degree
Mouthful；7- superheater；8- furnace outlet.
Specific embodiment
Hereinafter reference will be made to the drawings, and preferred embodiments of the present invention are described in detail.Preferred embodiment is only
In order to illustrate the utility model, rather than in order to limit the protection scope of the utility model.
The swirl flow combustion boiler that liquidates of embodiment 1:300MW grade burnout degree circle of contact arrangement
As shown in figure 1, figure 3 and figure 4, the swirl flow combustion boiler that liquidates of the utility model, respectively the front wall of burner hearth (2), after
Wall (3) is arranged symmetrically 3 layers of main burner, respectively arranges lower layer's after-flame spout in 3 ~ 10m of top of top layer's main burner
(5), on the left side wall (9) of burner hearth and right-side wall (10), place with lower layer fire air nozzle (5) same level height, respectively
Arrange that lower layer's after-flame spout (5), above 4 lower layers after-flame spout (5) form lower layer's fire air nozzle group.4 burnout degrees
The center line of spout arranges that the center line of 4 fire air nozzles forms an imaginary circle in the wall circle of contact.
1-2 meters of the height above lower layer's fire air nozzle group, burner hearth front wall (2), rear wall (3), left side wall (9) and right side
One upper layer fire air nozzle (6) of each arrangement is distinguished on wall (10), this 4 upper layer fire air nozzles (6) form upper layer burnout degree
Spout group.The center line of 4 fire air nozzles forms an imaginary circle；The direction of rotation of upper and lower level imaginary circle on the contrary, on
The layer circle of contact is rotation direction clockwise, and lower layer's circle of contact is counterclockwise.The imaginary circle can be circle, it is also possible to oval.Burnout degree is by firing
Wind snout sprays into burner hearth with pattern to the greatest extent, and an imaginary circle of contact is formed above burner hearth, carries out turbulent closure scheme to flue gas, mentions
High coal dust burn-off rate makes the thermo parameters method of section of burner hearth below the flue gas flow field and pendant superheater of furnace outlet flue more
Uniformly, the face thermal deviation that keeps from heat and local wall overheating problem.
Lower layer's fire air nozzle (5) on same furnace wall be with upper layer fire air nozzle (6) be staggered in arrangement, such as: it is preceding
Wall lower layer after-flame air port is close to left side wall, then front wall upper layer fire air nozzle is close to right-side wall.Such arrangement, so that upper,
The imaginary circle that lower layer's fire air nozzle jet stream burnout degree is formed is oppositely oriented, and then reaches and eliminate furnace outlet flue gas remnants rotation
The purpose turned.
Further, each fire air nozzle of upper and lower level is mounted on swing mechanism, can carry out horizontal direction and vertical
The swing in direction, to control the size that jet stream burnout degree is formed by imaginary circle, to control the mixed of Furnace Aerodynamic Field
Conjunction process.
In order to solve traditional burnout degree arrangement of opposed firing swirl flow combustion boiler since flow field disturbance is insufficient, mixed
A series of problems caused by effect difference is closed, the burnout degree of the utility model uses the swirl flow combustion pot that liquidates of circle of contact arrangement
Furnace enhances the lateral turbulence disturbance in after-flame stratification of wind flow field in burner hearth, and the oxygen of enhancing uncompleted burned carbon, CO and burnout degree is in burner hearth
Mixed effect eliminates the burning unevenness problem in furnace to improve the efficiency of combustion of boiler.
The liquidate burnout degree of swirl flow combustion boiler of the utility model has the characteristics that double-deck, reversed, circle of contact arrangement, on the one hand
Can be effectively prevented the burnout degree circle of contact flowing cause furnace outlet flue gas residual rotation, make the flue gas flow field of furnace outlet flue with
And the thermo parameters method of pendant superheater lower section section of burner hearth is more evenly；On the one hand the coverage area of after-flame stratification of wind is increased, promoted
Into coal dust after-flame, efficiency of combustion, the generation for inhibiting NOx can further improve.
The fire air nozzle of swirl flow combustion boiler of liquidating is swinging structure, can carry out the horizontal swing with vertical direction, adjust
Whole Furnace Aerodynamic Field flexibly realizes the runing adjustment changed for different types of coal, different load so as to adjust combustion position
Performance.
The swirl flow combustion boiler that liquidates of embodiment 2:600MW grade burnout degree circle of contact arrangement
As shown in figure 2, figure 5 and figure 6, the swirl flow combustion boiler that liquidates of the utility model, respectively the front wall of burner hearth (2), after
Wall (3) is arranged symmetrically 3 layers of main burner, is respectively arranged 8 lower layer's after-flame spouts in 3 ~ 10m of top of top layer's main burner
(5).Front wall close to left side wall 2 lower layer's after-flame air ports (5) and rear wall close to left side wall 2 lower layer's after-flame air port (5) groups
At lower layer's fire air nozzle group；Front wall is close to 2 lower layer's after-flame air ports (5) of right-side wall and rear wall close to the 2 of right-side wall
Lower layer's after-flame air port (5) forms lower layer's fire air nozzle group.The center line of 8 fire air nozzles is in that double circle of contacts are arranged, and 8
The center line of a fire air nozzle forms two imaginary circles；The direction of rotation of two imaginary circles of same layer is on the contrary, two vacations
Think that the circle of contact can be oval or be round.
1-2 meters of the height above lower layer's fire air nozzle corresponds to one layer of upper layer of lower layer's fire air nozzle location arrangements
Fire air nozzle, same to lower layer, 8 upper layer fire air nozzles (6) form left and right two fire air nozzle groups.8 fire air nozzles
Center line be in double circle of contacts arrangement, the center line of 8 fire air nozzles forms two imaginary circles；Two imaginary circles of same layer
Direction of rotation on the contrary, the direction of rotation of the corresponding imaginary circle of upper and lower level is also opposite.Left cut circle in upper layer is rotation direction clockwise,
Right cut circle is rotation direction counterclockwise；Lower layer's left cut circle is rotation direction counterclockwise, and right cut circle is rotation direction clockwise.
Burnout degree sprays into burner hearth by fire air nozzle pattern, and every group of burnout degree of upper and lower level forms two above burner hearth
The imaginary circle of contact carries out turbulent closure scheme to flue gas, improves coal dust burn-off rate, makes the flue gas flow field and screen formula of furnace outlet flue
Below superheater the thermo parameters method of section of burner hearth more evenly, the face thermal deviation that keeps from heat and local wall overheating problem.
Each fire air nozzle is mounted on swing mechanism, can carry out the swing of horizontal direction and vertical direction, pass through tune
Whole spout pivot angle makes the oppositely oriented of upper and lower and adjacent left and right imaginary circle, and then reaches and eliminate furnace outlet flue gas remnants
The purpose of rotation, and controllable jet stream burnout degree is formed by the size of imaginary circle, to control Furnace Aerodynamic Field
Mixed process, flame kernel height improve flue gas in the degree of filling of upper furnace, so that it is more advantageous to burning, prevent heating surface
Steam temperature transfinites, reduce NOx emission and reduces coking can flexibly be realized for different types of coal, no by the corrective action to burning
With the runing adjustment performance of load variations.
Claims (4)
1. a kind of swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement, the burner hearth (1) of the swirl flow combustion boiler that liquidates include
Front wall (2), rear wall (3), left side wall (9), right-side wall (10) arrange the main burner of swirl flow combustion mode on front wall, rear wall
(4), two layers of fire air nozzle group is arranged above main burner, it is characterised in that: two layers of fire air nozzle group arrangement is high
For degree in the vertical direction at a distance of 1-2 meters, all spouts of every layer of fire air nozzle group are located at same level height；
When the swirl flow combustion boiler that liquidates is 300MW grade, burner hearth cross section is substantially square, every layer of fire air nozzle quantity
It is four, is arranged on burner hearth four sides wall, the center line of four fire air nozzles is arranged in the wall circle of contact, every layer of four combustion
The center line of wind snout forms an imaginary circle to the greatest extent；The direction of rotation of upper and lower level imaginary circle is opposite；
When the swirl flow combustion boiler that liquidates is 600MW and ratings above, burner hearth cross section is rectangle, every layer of fire air nozzle number
Amount is eight, is arranged on boiler front-back wall, and the center line of eight fire air nozzles is in double circle of contact arrangements, every layer of eight combustion
The center line of wind snout forms two imaginary circles to the greatest extent；The direction of rotation of two imaginary circles of same layer is on the contrary, upper and lower level is opposite
The direction of rotation for the imaginary circle answered is also opposite.
2. the swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement according to claim 1, it is characterised in that: fire air nozzle
When quantity is four, four fire air nozzles, which are respectively perpendicular, to be arranged in burner hearth front wall, rear wall, left side wall and right-side wall.
3. the swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement according to claim 2, it is characterised in that: fire air nozzle
When quantity is four, lower layer's fire air nozzle (5) and upper layer fire air nozzle (6) on same furnace wall are to be staggered in arrangement.
4. the swirl flow combustion boiler that liquidates of -3 any burnout degree circle of contact arrangements according to claim 1, it is characterised in that: each
Fire air nozzle is mounted on swing mechanism, can be carried out the swing of horizontal direction and vertical direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821305053.4U CN208832441U (en) | 2018-08-14 | 2018-08-14 | The swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement |
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| CN201821305053.4U CN208832441U (en) | 2018-08-14 | 2018-08-14 | The swirl flow combustion boiler that liquidates of burnout degree circle of contact arrangement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606571A (en) * | 2021-07-07 | 2021-11-05 | 华电电力科学研究院有限公司 | Method for eliminating residual rotation of hearth outlet of four-corner tangential firing boiler |
| CN114353057A (en) * | 2021-12-03 | 2022-04-15 | 国家能源集团新能源技术研究院有限公司 | Exhaust air distribution system |
| CN116989345A (en) * | 2023-08-16 | 2023-11-03 | 中国电力工程顾问集团中南电力设计院有限公司 | Conveying structure of coupling biomass of coal-fired unit and co-firing method |
-
2018
- 2018-08-14 CN CN201821305053.4U patent/CN208832441U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606571A (en) * | 2021-07-07 | 2021-11-05 | 华电电力科学研究院有限公司 | Method for eliminating residual rotation of hearth outlet of four-corner tangential firing boiler |
| CN114353057A (en) * | 2021-12-03 | 2022-04-15 | 国家能源集团新能源技术研究院有限公司 | Exhaust air distribution system |
| CN116989345A (en) * | 2023-08-16 | 2023-11-03 | 中国电力工程顾问集团中南电力设计院有限公司 | Conveying structure of coupling biomass of coal-fired unit and co-firing method |
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Address after: 210023 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Patentee after: GUODIAN FUZHOU POWER GENERATION Co.,Ltd. Address before: 210023 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. Patentee before: GUODIAN FUZHOU POWER GENERATION Co.,Ltd. |