CN103115353A - Half-W-shaped flame burning supercritical power station boiler - Google Patents
Half-W-shaped flame burning supercritical power station boiler Download PDFInfo
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- CN103115353A CN103115353A CN2013100672926A CN201310067292A CN103115353A CN 103115353 A CN103115353 A CN 103115353A CN 2013100672926 A CN2013100672926 A CN 2013100672926A CN 201310067292 A CN201310067292 A CN 201310067292A CN 103115353 A CN103115353 A CN 103115353A
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Abstract
The invention discloses a half-W-shaped flame burning supercritical power station boiler, and relates to a power station boiler which is used in a thermal power station, burns anthracites or low volatile lean coals, has a supercritical steam condition. The half-W-shaped flame burning supercritical power station boiler comprises a lower hearth with a front arch and a rear arch, the front arch and the rear arch of the lower hearth are respectively provided with two rows of weak vortex burners, and the slightly lower parts of a front wall and a rear wall of the lower hearth are respectively provided with one line of dual register burners. One layer or two layers of separated secondary air nozzles are arranged at the parts of front wall and rear wall of the upper hearth, which are away from the bottom of a platen superheater by 8m-12m. Each row of burners is arranged uniformly along the furnace width. According to the half-W-shaped flame burning supercritical power station boiler, the furnace side thermal deviation of the lower hearth water-wall tube is reduced significantly, the water circulation reliability is improved significantly, the Nox generation amount is decreased significantly, and the half-W-shaped flame burning supercritical power station boiler can adopt a less-oil or oil-free pulverized coal ignition technology easily, can be easily in large scale and can be used for designing and manufacturing the supercritical power station boiler which is in 1000MW level and burns anthracites or low volatile lean coals.
Description
(1) technical field:
The present invention's half overcritical station boiler of " W " flame combustion relates to the novel furnace of the station boiler with supercritical steam conditions that uses anthracite or Low Volatile Lean Coal of a kind of thermal power station use.
(2) background technology:
The typical type of furnace of the station boiler that uses anthracite or Low Volatile Lean Coal that the thermal power station of prior art uses is " W " flame combustion boiler, has subcritical steam conditions or supercritical steam conditions; Lower hearth water-cooling wall with " W " flame combustion boiler of supercritical steam conditions has used the low-quality flow technology without exception, the lower hearth water-cooling wall will cause the forfeiture of forward flow self compensation characteristic along the excessive thermal deviation of stove cross direction, jeopardize lower hearth water-cooling wall security of operation.
The burner of " W " flame combustion boiler all is arranged on the narrow vault of forward and backward wall, be arranged in burner Jet with downward flow direction breeze airflow and the part Secondary Air of vault, its flame directive burner hearth center turnover makes progress, and " U " shape flame of front and back consists of " W " flame; The forward and backward wall paper of lower hearth is equipped with Secondary Air and tertiary air spout.The burner of prior art " W " flame combustion boiler has cross-tube burner (parallel flow burner) and weak vortex burner two large classes." W " flame combustion boiler is selected very high lower hearth volume heat load usually, and the large tracts of land wall with refractory lining, refracto is set.
The common adapted double-inlet and double-outlet steel ball mill of prior art large and medium-sized " W " flame combustion boiler positive pressure direct blowing powder system.
Prior art there is no design, makes the achievement of the station boiler with supercritical steam conditions that uses anthracite or Low Volatile Lean Coal of 1000MW grade.
The station boiler that the thermal power station of prior art uses anthracite or Low Volatile Lean Coal also has the successful case of using opposed firing, Terms of Corner Tangential Combustion, but the low-load combustion-stabilizing poor-performing.
(3) summary of the invention:
Technical problem to be solved:
The burner of " W " flame combustion boiler all is arranged on the narrow vault of forward and backward wall, burner region wall thermic load is very high, the lower hearth volume heat load is also very high, make the flame temperature level in lower hearth combustion centre district very high, the NOx growing amount exceeds more than one times than opposed firing combustion system.
The coupling that the burner of " W " flame combustion boiler all is arranged on the narrow vault of forward and backward wall with coal pulverizer becomes very difficult, and when particularly the part coal pulverizer was stopped transport, the work burner was difficult to guarantee along uniformity and the symmetry of furnace chamber width; In overcritical " W " flame combustion boiler startup process, the furnace side thermal deviation of lower hearth water screen tube increases water circulation reliability variation.
It is relatively poor that the burner of " W " flame combustion boiler all is arranged on the narrow vault of forward and backward wall thermal flue gas back stream effect, wind, powder mix relatively poor in early days, be the control unburned carbon in flue dust, the large tracts of land wall with refractory lining, refracto is set with the radiant heat firing coal-dust at lower hearth, need consumes great amount of fuel oil in order to heat lower hearth large tracts of land wall with refractory lining, refracto at boiler startup and underload.
Solve the technical scheme that its technical problem adopts:
The present invention's half overcritical station boiler of " W " flame combustion is taked and the diverse technology path of prior art, and the novel furnace of the station boiler with supercritical steam conditions that uses anthracite or Low Volatile Lean Coal of a kind of thermal power station use is provided.
The present invention's half overcritical station boiler of " W " flame combustion comprises the lower hearth with face arch, rear arch; Respectively arrange the weak vortex burner of 2 row on lower hearth face arch, the lower hearth rear arch; The weak vortex burner of every row is connected with a double-inlet and double-outlet steel ball mill; The two wind vortex burners of transferring of 1 row are respectively arranged at the on the lower side position of wall behind lower hearth front wall, lower hearth; The two wind vortex burners of transferring of every row are connected with a double-inlet and double-outlet steel ball mill; Wall is provided with 1 layer or 2 layers of separated secondary wind nozzle apart from 8m to 12m position, pendant superheater bottom behind upper furnace front wall, upper furnace, and direct current wind and the eddy flow wind of each separated secondary wind nozzle ejection are adjustable respectively; Side towards the fire at forward and backward arch is provided with wall with refractory lining, refracto; In two accent wind vortex burners, be provided with the breeze airflow dense-and-weak separator; In the scope of upper and lower each 2.5m of two accent wind vortex burner center lines, be provided with wall with refractory lining, refracto; Two accent wind vortex burners are for starting burner.
Because be arranged in weak vortex burner Jet with downward flow direction breeze airflow and the part Secondary Air of vault, its flame directive burner hearth center turnover makes progress, " U " shape flame of front and back consists of " W " flame; Horizontally disposed behind lower hearth front wall, lower hearth on the lower side section two of wall transfer the wind vortex burners to consist of to fall " T " flame, so the present invention is named the half overcritical station boiler of " W " flame combustion.
The beneficial effect of the invention:
● the every row burner that is connected with each double-inlet and double-outlet steel ball mill is all along the wide even distribution of stove, and the furnace side thermal deviation of lower hearth water screen tube significantly reduces, and start-up course water circulation reliability is significantly improved;
● burner region wall thermic load significantly descends, and heating power type and fuel type NOx growing amount significantly descend, and separated secondary wind further suppresses NOx and generates also effectively control unburned carbon in flue dust;
● two accent wind vortex burners significantly improve thermal flue gas back stream effect, and wind, powder mix improvement in early days, are easy to adopt few oil or without oily pulverized coal ignition technology;
● the wind pipeline that burner is connected with the double-inlet and double-outlet steel ball mill is easy to arrange that uniformity, symmetry are significantly improved;
● compare with opposed firing, Terms of Corner Tangential Combustion, because the wall with refractory lining, refracto of sufficiently high lower hearth volume heat load and necessary amount is arranged, the low-load combustion-stabilizing performance is significantly improved;
● simplify Secondary Air and tertiary air spout, bellows and baffle plate that the forward and backward wall paper of lower hearth is put, and created condition for the air stage feeding low nitrogen burning;
● be easy to maximize, can be used for designing, making the station boiler with supercritical steam conditions that uses anthracite or Low Volatile Lean Coal of 1000MW grade.
(4) description of drawings:
Fig. 1 is the burner arrangement figure example one of the half overcritical station boiler of " W " flame combustion.
Fig. 2 is the burner arrangement figure example two of the half overcritical station boiler of " W " flame combustion.
In Fig. 1 and Fig. 2:
1 pendant superheater, 2 upper furnace front walls,
Wall behind 3 upper furnaces, 4 lower hearth face arch,
5 lower hearth rear arches, 6 lower hearth front walls,
Wall behind 7 lower hearths, 8 separated secondary wind nozzles,
9 weak vortex burners, 10 pairs of accent wind vortex burners.
(5) specific embodiment:
Embodiment 1:
Now in conjunction with Fig. 1 with a 1000MW grade, the design load of main stripping temperature/reheat steam temperature degree is that 605 ℃/613 ℃ the overcritical station boiler of single reheat ∏ type is the optimal way that example explanation realizes invention.
The present invention's half overcritical station boiler of " W " flame combustion comprises the lower hearth with face arch, rear arch; Respectively arrange the weak vortex burner of 2 row on lower hearth face arch, the lower hearth rear arch; Every row are comprised of 8 weak vortex burners, and are wide uniform along stove; The weak vortex burner of every row is connected with a double-inlet and double-outlet steel ball mill; The two wind vortex burners of transferring of 1 row are respectively arranged at the on the lower side position of wall behind lower hearth front wall, lower hearth; Every row are comprised of 8 two wind vortex burners of transferring, and are wide uniform along stove; The two wind vortex burners of transferring of every row are connected with a double-inlet and double-outlet steel ball mill; Wall is respectively arranged with 2 layers of separated secondary wind nozzle apart from 8m to 12m position, pendant superheater bottom behind upper furnace front wall, upper furnace; Every layer is comprised of 12 separated secondary wind nozzles, wide uniform along stove; Direct current wind and the eddy flow wind of each separated secondary wind nozzle ejection are adjustable respectively; Side towards the fire at face arch, rear arch is provided with wall with refractory lining, refracto; In two accent wind vortex burners, be provided with the breeze airflow dense-and-weak separator; In the scope of upper and lower each 2.5m of two accent wind vortex burner center lines, be provided with wall with refractory lining, refracto; Two accent wind vortex burners are for starting burner.
Embodiment 2:
Now in conjunction with Fig. 2 with a 1000MW grade, the design load of main stripping temperature/reheat steam temperature degree is that 605 ℃/613 ℃ the overcritical station boiler of single reheat ∏ type is the optimal way that example explanation realizes invention.
The present invention's half overcritical station boiler of " W " flame combustion comprises the lower hearth with face arch, rear arch; Respectively arrange the weak vortex burner of 2 row on lower hearth face arch, the lower hearth rear arch; Every row are comprised of 8 weak vortex burners, and are wide uniform along stove; The weak vortex burner of every row is connected with a double-inlet and double-outlet steel ball mill; The two wind vortex burners of transferring of 1 row are respectively arranged at the on the lower side position of wall behind lower hearth front wall, lower hearth; Every row are comprised of 8 two wind vortex burners of transferring, and are wide uniform along stove; The two wind vortex burners of transferring of every row are connected with a double-inlet and double-outlet steel ball mill; Wall is respectively arranged with 2 layers of separated secondary wind nozzle apart from 8m to 12m position, pendant superheater bottom behind upper furnace front wall, upper furnace; Every layer is comprised of 12 separated secondary wind nozzles, wide uniform along stove; Direct current wind and the eddy flow wind of each separated secondary wind nozzle ejection are adjustable respectively; Side towards the fire at face arch, rear arch is provided with wall with refractory lining, refracto; In two accent wind vortex burners, be provided with the breeze airflow dense-and-weak separator; In the scope of upper and lower each 2.5m of two accent wind vortex burner center lines, be provided with wall with refractory lining, refracto; Two accent wind vortex burners are for starting burner.
Comparison diagram 2 and Fig. 1 be both difference as seen: in embodiment 1, the face arch of lower hearth, rear arch are horizontal by the clinoplain of 15 ° of angles of cut, and the center line of the weak vortex burner of 2 row that each is arranged on face arch, the rear arch and the angle of cut of vertical line also are all 15 ° of angles of cut; Among the embodiment 2, the face arch of lower hearth, rear arch are respectively by forming horizontal by the clinoplain of 15 ° of angles of cut with horizontal by the clinoplain of 50 ° of angles of cut, the center line of the weak vortex burner at nearly burner hearth center and the angle of cut of vertical line are 15 °, and the center line of the weak vortex burner in the outside and the angle of cut of vertical line are 50 °.Embodiment 2 compares with embodiment 1, has further reduced burner region wall thermic load, pulls open the centreline spacing of the weak vortex burner of 2 row, improve the weak vortex burner of 2 row in, rear journey wind, powder mixed effect.
Claims (1)
1. the overcritical station boiler of one and half " W " flame combustion is characterized in that: comprise the lower hearth with face arch, rear arch; Respectively arrange the weak vortex burner of 2 row on lower hearth face arch, the lower hearth rear arch; The weak vortex burner of every row is connected with a double-inlet and double-outlet steel ball mill; The two wind vortex burners of transferring of 1 row are respectively arranged at the on the lower side position of wall behind lower hearth front wall, lower hearth; The two wind vortex burners of transferring of every row are connected with a double-inlet and double-outlet steel ball mill; Wall is provided with 1 layer or 2 layers of separated secondary wind nozzle apart from 8m to 12m position, pendant superheater bottom behind upper furnace front wall, upper furnace, and direct current wind and the eddy flow wind of each separated secondary wind nozzle ejection are adjustable respectively; Side towards the fire at forward and backward arch is provided with wall with refractory lining, refracto; In two accent wind vortex burners, be provided with the breeze airflow dense-and-weak separator; In the scope of upper and lower each 2.5m of two accent wind vortex burner center lines, be provided with wall with refractory lining, refracto; Two accent wind vortex burners are for starting burner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310067292.6A CN103115353B (en) | 2013-03-04 | 2013-03-04 | Half-W-shaped flame burning supercritical power station boiler |
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| CN201310067292.6A CN103115353B (en) | 2013-03-04 | 2013-03-04 | Half-W-shaped flame burning supercritical power station boiler |
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| CN103115353B CN103115353B (en) | 2015-06-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132322A (en) * | 2014-08-04 | 2014-11-05 | 章礼道 | Semi-W flame combustion subcritical steam pocket furnace |
| CN104296129A (en) * | 2014-10-15 | 2015-01-21 | 中国计量学院 | Symmetrical-combustion W-Type flame boiler |
| CN106179685A (en) * | 2016-08-31 | 2016-12-07 | 哈尔滨锅炉厂有限责任公司 | The fan mill arrangement system of tower 350MW super critical boiler and method for arranging |
| CN106196135A (en) * | 2016-08-31 | 2016-12-07 | 哈尔滨锅炉厂有限责任公司 | The fan mill arrangement system of π type 350MW super critical boiler and method for arranging |
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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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2013
- 2013-03-04 CN CN201310067292.6A patent/CN103115353B/en active Active
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| GB980818A (en) * | 1961-12-13 | 1965-01-20 | Combustion Eng | Method and apparatus for generating vapor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132322A (en) * | 2014-08-04 | 2014-11-05 | 章礼道 | Semi-W flame combustion subcritical steam pocket furnace |
| CN104296129A (en) * | 2014-10-15 | 2015-01-21 | 中国计量学院 | Symmetrical-combustion W-Type flame boiler |
| CN104296129B (en) * | 2014-10-15 | 2016-08-24 | 宁波大学 | A kind of W type flame boiler of symmetrical combustion |
| CN106179685A (en) * | 2016-08-31 | 2016-12-07 | 哈尔滨锅炉厂有限责任公司 | The fan mill arrangement system of tower 350MW super critical boiler and method for arranging |
| CN106196135A (en) * | 2016-08-31 | 2016-12-07 | 哈尔滨锅炉厂有限责任公司 | The fan mill arrangement system of π type 350MW super critical boiler and method for arranging |
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| CN103115353B (en) | 2015-06-17 |
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