CN203628632U - Upper and lower thick and thin primary air intensively arranged combustion device - Google Patents
Upper and lower thick and thin primary air intensively arranged combustion device Download PDFInfo
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- CN203628632U CN203628632U CN201320890629.9U CN201320890629U CN203628632U CN 203628632 U CN203628632 U CN 203628632U CN 201320890629 U CN201320890629 U CN 201320890629U CN 203628632 U CN203628632 U CN 203628632U
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Abstract
The utility model provides an upper and lower thick and thin primary air intensively arranged combustion device, relating to a pulverized coal combustion device and aiming to solve the problem that the NOx emission concentrations of pulverized coal boilers with high primary air rates are difficult to control at present. The combustion device is characterized in that at least three layers of primary air nozzles are arranged from top to bottom and are arranged between two layers of fuel oil auxiliary secondary air nozzles; an underpinning secondary air nozzle is arranged below the lower fuel oil auxiliary secondary air nozzle; a compact over fire air nozzle is arranged above the upper fuel oil auxiliary secondary air nozzle; a lower separating over fire air nozzle and upper separating over fire air nozzles are arranged above the compact over fire air nozzle in sequence; a blunt body is horizontally arranged in the middle of each layer of primary air nozzle; a nozzle at the upper part of the blunt body is a thick pulverized coal primary air nozzle; a nozzle at the lower part of the blunt body is a thin pulverized coal primary air nozzle; a pair of combustion stabilization teeth are arranged in the thick pulverized coal primary air nozzle; surrounding air is arranged along the peripheries of the primary air nozzles. The combustion device is used for efficient low-pollution combustion of pulverized coal boilers with high primary air rates.
Description
Technical field
The utility model belongs to coal-powder boiler tangential firing technology, is specifically related to a kind of burner of a upper and lower deep or light wind centralized arrangement.
Background technology
Coal-powder boiler tangential firing technology refers generally to breeze airflow and introduces from the parallel flow burner that is arranged in 4 jiaos, burner hearth (or 6 jiaos, 8 jiaos) mode that burner hearth burns.The wind powder mixture co-operating coming by each angle forms a strong eddy flow fireball burning in stove.General first and second Chang Wei interval, air port layout, the geometric center lines in each air port is all tangent with one or several imaginary circle of central authorities respectively.
In this boiler, part boiler is because of coal-fired high-moisture, low heat value (as brown coal, ub-bituminous coal etc.), or cause drying capacity inadequate because of a wind-warm syndrome deficiency etc., also comprise reasons such as preventing pulverized coal channel chute blockage, causing concrete running to have to adopt exceedes design load and (accounts for 25%～35% of total blast volume, primary air velocity 20～24m/s) more primary air ratio (as 40%～50%, 29～34m/s).This causes flame combustion unstable, and NOx controls difficulty to be increased greatly.Remove in the case 5% Air Leakage Into Boilers, total secondary air ratio is only remaining 45%～55%, generates, primary zone secondary air flow only remaining approximately 25%～30% if separate 20%～25% air quantity as after-flame wind to control NOx.These air quantity are difficult to meet the needs of end wind, surrounding air, alopecia areata and main Secondary Air simultaneously, and the reduction of overall secondary wind speed causes jet rigidity deficiency, to burner hearth flow, burning and NOx generate to control and caused harmful effect.
Upper and lower dense-dilute burner combustion technology has been widely used in the tangential coal dust firing of direct current field.It is that a wind is carried out to deep or light classification in short transverse, form thick coal culm air-flow and thin powdered coal air-flow, thick coal culm air-flow is in the time of burning, because ignition heat reduces, Volatile is fast, and burning rapidly, is conducive to catching fire and burning of coal dust, simultaneously because thick coal culm air-flow and thin powdered coal air-flow have all departed from stoichiometric ratio burning, so can reduce the generation of NOx.Specifically, in the exploitation of burner, U.S. CE company has developed wide regulating ratio (WR) burner, utilizes the centrifugation of elbow to form bias pulverized coal air-flow, and then bias pulverized coal air-flow enters burner hearth by the horizontal baffle being arranged in nozzle body; Low pollution (PM) burner of Mitsubishi Heavy Ind. Ltd. (MHI) development, mainly formed by airduct, elbow, thick coal culm spout and a thin powdered coal spout, primary wind and powder air-flow separates in the time of elbow under the effect of centrifugal force, thick coal culm air-flow enters burner hearth by top nozzle, thin powdered coal air-flow enters burner hearth by lower nozzle, thereby realizes the upper and lower bias combustion of coal dust.But also find in actual moving process, while adopting upper and lower bias combustion, deflection easily occurs a wind, occurring when deflection, a dense wind breeze airflow, in the zonal combustion close to from water-cooling wall, causes the phenomenons such as water-cooling wall slagging scorification and high temperature corrosion.
Utility model content
The utility model is the problem that solves the NOx concentration of emission control difficulty of current high primary air ratio pulverized-coal fired boiler, and then a kind of burner of a upper and lower deep or light wind centralized arrangement is provided.
The utility model is to solve the problems of the technologies described above the technical scheme of taking to be: the burner of a upper and lower deep or light wind centralized arrangement of the present utility model comprises wind snout one time, backing overfire air port, close-coupled after-flame wind snout, lower separate type after-flame wind snout, upper separate type after-flame wind snout and two-layer fuel oil secondary air spout, one time wind snout arranges at least three layers from top to bottom, a wind snout is between two-layer fuel oil secondary air spout, the arranged beneath that is positioned at the fuel oil secondary air spout of lower floor has backing overfire air port, the top that is positioned at the fuel oil secondary air on upper strata is furnished with close-coupled after-flame wind snout, the top of close-coupled after-flame wind snout is disposed with lower separate type after-flame wind snout, upper separate type after-flame wind snout, the middle part of a wind snout has been horizontally disposed with bluff body, the spout on the top of bluff body is wind snout of thick coal culm, the spout of bluff body bottom is wind snout of thin powdered coal, is provided with a pair of steady combustion tooth in wind snout of thick coal culm, and one time wind snout is provided with surrounding air along periphery.
The beneficial effects of the utility model are:
The burner of a upper and lower deep or light wind centralized arrangement of the present utility model be to design for high primary air ratio (40-50%) pulverized-coal fired boiler, by not arranging main Secondary Air in main burner region, ensure enough after-flame wind (accounting for total blast volume 20-25%) with this; Carrying out deep or light segregated combustion, and adopt a relatively little dense wind snout can reduce the coal-air ratio of a dense wind, is all favourable for smooth combustion and reduction NOx.The large surrounding air of higher primary air velocity and back-fire side can guarantee not deflection of primary air jet, prevent that high concentration pulverized coal air-flow brush wall from causing slagging scorification and high temperature corrosion, sufficient after-flame wind also can make main burner region form low oxygen combustion, and then plays the effect of the NOx total emissions concentration that reduces 20%～40%;
The utility model is not arranged main Secondary Air in main burner region, and burner spacing is adjusted leeway and expanded, and can reduce the steam temperature causing because of the setting of after-flame wind and change.
Accompanying drawing explanation
Fig. 1 is single angle layered arrangement figure of the burner of a upper and lower deep or light wind centralized arrangement of the present utility model; Fig. 2 is the structural representation of a wind snout 1 in the specific embodiment one; Fig. 3 is that the Process In A Tangential Firing after-flame wind in the specific embodiment nine is arranged schematic diagram; Fig. 4 is that the wind of six-corner tangential boiler in the specific embodiment nine is arranged schematic diagram.
The specific embodiment
The specific embodiment one: as shown in Fig. 1～2, the burner of a upper and lower deep or light wind centralized arrangement of present embodiment comprises wind snout 1 one time, backing overfire air port 3, close-coupled after-flame wind snout 4, lower separate type after-flame wind snout 5, upper separate type after-flame wind snout 6 and two-layer fuel oil secondary air spout 2, one time wind snout 1 arranges at least three layers from top to bottom, a wind snout 1 of centralized arrangement is between two-layer fuel oil secondary air spout, the arranged beneath that is positioned at the fuel oil secondary air spout 2 of lower floor has backing overfire air port 3, the top that is positioned at the fuel oil secondary air 2 on upper strata is furnished with close-coupled after-flame wind snout 4, the top of close-coupled after-flame wind snout 4 is disposed with lower separate type after-flame wind snout 5, upper separate type after-flame wind snout 6, the middle part of a wind snout 1 has been horizontally disposed with bluff body 10, the spout on the top of bluff body 10 is wind snout 7 of thick coal culm, the spout of bluff body 10 bottoms is wind snout 8 of thin powdered coal, is provided with 11, wind snouts 1 of a pair of steady combustion tooth and is provided with surrounding air 9 along periphery in wind snout 7 of thick coal culm.
Lower separate type after-flame wind snout 5 accounts for 20%～25% of total blast volume with upper separate type after-flame wind snout 6 air quantity sums; Described in present embodiment, burner is arranged symmetrically with between two, forms light-dense-dense-light-light-dense---continuous layout.
The specific embodiment two: as shown in Figure 2, described in present embodiment, the scope of the depth-width ratio H/B of a wind snout 1 is 1.2～1.5, the ratio of wind snout 7 areas of thick coal culm and wind snout 8 areas of thin powdered coal is 0.55～0.8, when the summation air quantity of a wind snout 1 account for boiler total blast volume 40%～50% time, the wind speed of a wind snout 1 is controlled at 24m/s～30m/s.Arrange like this during in order to high primary air ratio, on the basis that does not increase wind snout 1 and install passage lateral separation, increase wind snout area one time, actual primary air velocity is controlled to 24～30m/s.Larger area back-fire side surrounding air spout can be set simultaneously, guarantee that primary air jet does not rush wall, wind snout 7 areas of thick coal culm in present embodiment and the ratio of wind snout 8 areas of thin powdered coal are 0.55～0.8, can lower the coal-air ratio in wind of thick coal culm.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment three: as shown in Figure 2, described in present embodiment, the surrounding air 9 in wind snout 1 left side is back-fire side surrounding air 9-1, a described wind snout 1 right side surrounding air 9 is to fiery side surrounding air 9-2, and back-fire side surrounding air 9-1 area is 3～6 times to fiery side surrounding air 9-2 area.Other composition and annexation are identical with the specific embodiment one or two.
The specific embodiment four: as shown in Figure 2, the upper periphery wind 9-3 area described in present embodiment on a wind snout 1 is identical with lower surrounding air 9-4 area.Other composition and annexation are identical with the specific embodiment three.
The specific embodiment five: as shown in Figure 2, present embodiment back-fire side surrounding air 9-1 area is 4～8 times of upper periphery wind 9-3 area.Other composition and annexation are identical with the specific embodiment one, two or four.
The specific embodiment six: as shown in Figure 1, present embodiment backing overfire air port 3 nozzle areas are 1.5 times～2 times of upper strata fuel oil secondary air 2 areas.Bottom wind snout 3 adopts large orifice design, plays the effect of orlop holder powder and initial rotation.Other composition and annexation are identical with the specific embodiment five.
The specific embodiment seven: as shown in Figure 1, the spacing T1 at close-coupled after-flame wind snout 4 centers and lower separate type after-flame wind snout 5 centers is 2m～4m described in present embodiment.Other composition and annexation are identical with the specific embodiment one, two, four or six.
The specific embodiment eight: as shown in Figure 1, lower separate type after-flame wind snout 5 is 2m～4m with the spacing T2 at upper separate type after-flame wind snout 6 centers described in present embodiment.Other composition and annexation are identical with the specific embodiment seven.
Operation principle:
Referring to Fig. 1-4, in the time adopting Process In A Tangential Firing or wall formula circle of contact boiler, the low nitrogen combustion apparatus of four wind centralized arrangement is arranged on four angles or four sides water-cooling wall of burner hearth; In the time adopting six-corner tangential boiler, the low nitrogen combustion apparatus of six wind centralized arrangement is arranged on six angles of burner hearth, in the time adopting anistree circle of contact boiler, the low nitrogen combustion apparatus of eight wind centralized arrangement is arranged on eight angles of burner hearth; When the summation air quantity of a wind snout 1 account for boiler total blast volume 40%～50% time, primary air velocity is controlled at 24～30m/s; Upper and lower dense-dilute burner combustion technology a centralized arrangement for elegance, a dense wind snout is less than a light wind snout, and a wind combustor adopts and is arranged symmetrically with between two simultaneously; Bottom wind snout 3 air-flows become 3～6 ° of direction tangents to spray in stove with diagonal; The wind powder air-flow of a wind snout 1 becomes 2～5 ° of direction tangents to spray in stove on section of burner hearth with diagonal; The wind powder air-flow center line of close-coupled after-flame wind snout 4 is or low-angle 0～5 ° traditional method of indicating the pronunciation of a Chinese character consistent with general mood stream center line on section of burner hearth; Burner hearth primary zone is mobile for being rotated counterclockwise; Oil overfire air port 2 and lower oil secondary air spout 13 only uses in the time of ignition of the boiler and low-load combustion-stabilizing, and nominal situation ShiShimonoseki is to minimum (only retaining cooled nozzle Air Quantity Required); According to the size of boiler capacity, close-coupled after-flame wind snout 4 can be arranged one-level or two-stage, and lower separate type after-flame wind snout 5 and upper separate type after-flame wind snout 6 can be arranged one or more levels, and the direction of after-flame wind is that horizontal and vertical swings, to regulate preferably temperature.
Claims (8)
1. the burner of a upper and lower deep or light wind centralized arrangement, it is characterized in that: described burner comprises a wind snout (1), backing overfire air port (3), close-coupled after-flame wind snout (4), lower separate type after-flame wind snout (5), upper separate type after-flame wind snout (6) and two-layer fuel oil secondary air spout (2), a wind snout (1) arranges at least three layers from top to bottom, a wind snout (1) is between two-layer fuel oil secondary air spout, the arranged beneath that is positioned at the fuel oil secondary air spout (2) of lower floor has backing overfire air port (3), the top that is positioned at the fuel oil secondary air (2) on upper strata is furnished with close-coupled after-flame wind snout (4), the top of close-coupled after-flame wind snout (4) is disposed with lower separate type after-flame wind snout (5), upper separate type after-flame wind snout (6), the middle part of a wind snout (1) has been horizontally disposed with bluff body (10), the spout on the top of bluff body (10) is a wind snout of thick coal culm (7), the spout of bluff body (10) bottom is a wind snout of thin powdered coal (8), in a wind snout of thick coal culm (7), be provided with a pair of steady combustion tooth (11), a wind snout (1) is provided with surrounding air (9) along periphery.
2. the burner of an a kind of upper and lower deep or light wind centralized arrangement according to claim 1, it is characterized in that: the scope of the depth-width ratio H/B of a described wind snout (1) is 1.2～1.5, the ratio of wind snout (7) area of thick coal culm and a wind snout of thin powdered coal (8) area is 0.55～0.8.
3. the burner of a upper and lower deep or light wind centralized arrangement according to claim 1 and 2, it is characterized in that: the surrounding air (9) in described wind snout 1 left side is back-fire side surrounding air (9-1), a described wind snout (1) right side surrounding air (9) is to fiery side surrounding air (9-2), and back-fire side surrounding air (9-1) area is 3～6 times to fiery side surrounding air (9-2) area.
4. the burner of an a kind of upper and lower deep or light wind centralized arrangement according to claim 3, is characterized in that: upper periphery wind (9-3) area on a described wind snout (1) is identical with lower surrounding air (9-4) area.
5. according to the burner of a kind of upper and lower deep or light wind centralized arrangement described in claim 1,2 or 4, it is characterized in that: back-fire side surrounding air (9-1) area is 4～8 times of upper periphery wind (9-3) area.
6. the burner of an a kind of upper and lower deep or light wind centralized arrangement according to claim 5, is characterized in that: backing overfire air port (3) nozzle area is 1.5 times～2 times of upper strata fuel oil secondary air (2) area.
7. according to the burner of a kind of upper and lower deep or light wind centralized arrangement described in claim 1,2,4 or 6, it is characterized in that: the spacing (T1) at described close-coupled after-flame wind snout (4) center and lower separate type after-flame wind snout (5) center is 2m～4m.
8. the burner of an a kind of upper and lower deep or light wind centralized arrangement according to claim 7, is characterized in that: described lower separate type after-flame wind snout (5) is 2m～4m with the spacing (T2) at upper separate type after-flame wind snout (6) center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320890629.9U CN203628632U (en) | 2013-12-31 | 2013-12-31 | Upper and lower thick and thin primary air intensively arranged combustion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320890629.9U CN203628632U (en) | 2013-12-31 | 2013-12-31 | Upper and lower thick and thin primary air intensively arranged combustion device |
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| CN203628632U true CN203628632U (en) | 2014-06-04 |
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| CN201320890629.9U Withdrawn - After Issue CN203628632U (en) | 2013-12-31 | 2013-12-31 | Upper and lower thick and thin primary air intensively arranged combustion device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697463A (en) * | 2013-12-31 | 2014-04-02 | 北京国电龙高科环境工程技术有限公司 | Up-and-down thick-and-thin primary air concentrated distribution type combustion device |
| CN113819486A (en) * | 2021-07-30 | 2021-12-21 | 华能国际电力股份有限公司上海石洞口第二电厂 | Method for reducing nitrogen oxides of coal-fired unit |
-
2013
- 2013-12-31 CN CN201320890629.9U patent/CN203628632U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697463A (en) * | 2013-12-31 | 2014-04-02 | 北京国电龙高科环境工程技术有限公司 | Up-and-down thick-and-thin primary air concentrated distribution type combustion device |
| CN103697463B (en) * | 2013-12-31 | 2016-02-03 | 北京国电龙高科环境工程技术有限公司 | The burner of upper and lower deep or light First air centralized arrangement |
| CN113819486A (en) * | 2021-07-30 | 2021-12-21 | 华能国际电力股份有限公司上海石洞口第二电厂 | Method for reducing nitrogen oxides of coal-fired unit |
| CN113819486B (en) * | 2021-07-30 | 2024-02-27 | 华能国际电力股份有限公司上海石洞口第二电厂 | Method for reducing nitrogen oxides of coal-fired unit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140604 Effective date of abandoning: 20160203 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |