CN103104911B - A kind of three grades of burnout degree arrangements - Google Patents
A kind of three grades of burnout degree arrangements Download PDFInfo
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- CN103104911B CN103104911B CN201310054988.5A CN201310054988A CN103104911B CN 103104911 B CN103104911 B CN 103104911B CN 201310054988 A CN201310054988 A CN 201310054988A CN 103104911 B CN103104911 B CN 103104911B
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Abstract
The invention provides a kind of three grades of burnout degree arrangements, comprise First air coal nozzle, overfire air jet, main burner, low level is separated burnout degree bellows, and meta is separated burnout degree bellows, high-order separation burnout degree bellows, each angle of burner hearth is furnished with one group of main burner, and separation burnout degree is divided into low level to be separated burnout degree, meta separation burnout degree is separated burnout degree with a high position.Low level is separated on four angles that burnout degree bellows are arranged in burner hearth or on four sides wall, and meta is separated on four angles that burnout degree bellows are arranged in burner hearth or on four sides wall, is high-orderly separated on four angles that burnout degree bellows are arranged in burner hearth or on four sides wall.The present invention can using integrated air classification technique control NO in bituminous coal and meager coal stove at present
xon effect 250 ~ 650mg/m3 (during oxygen concentration of flue gas 6%) basis, realize NO
xlow emission, makes NO
xgrowing amount reduces about 25% again.Solve the fly ash combustible material that integrated air classification technique brings in stove high, the velocity of flue gas of furnace outlet and the problem such as temperature deviation is large, add the runing adjustment performance for Coal rank and load variations simultaneously.
Description
Technical field
The present invention relates to a kind of three grades of burnout degree arrangements, belong to burner technical field.
Background technology
Nitrogen oxide (NO
x, comprise NO, NO
2, N
2o) be the gas that a class can cause atmospheric environment severe contamination, one of main source being considered to atmosphere pollution.The nitrogen oxide discharged because of combustion of fossil fuels at world wide every year occupies very large ratio in all discharged nitrous oxides.The environmental regulation of increasingly stringent requires the combustion technology that research and development are advanced, to reduce NO
xdeng the discharge of pollutant.The maximum feature of the Energy Mix of current China is based on coal, accounts for more than 70%, and this will produce a large amount of oxides of nitrogen gas, and therefore such energy resource structure increases economical and efficient and ecological environment all can have a negative impact.The conventional coal-fired power station boiler NO of current existing control
xthe technical measures of discharge can be divided into low NO
xcombustion technology and flue gases purification two class.Flue gases purification is by removing NO in flue gas
xreduce NO
xfinal discharge capacity.Domestic and international thermal power plant NO
xreduce discharging mainly through the operation mode of advanced person, low NO
xcombustion technology and tail flue gas denitration technology realize.Tail flue gas denitration technology is relatively more thorough, but its investment is expensive with operation and maintenance cost.Advanced low NO
xcombustion technology can reduce concentration of emission to 150 ~ 350mg/m
3below, and along with NO in stove
xthe minimizing of growing amount, also can reduce the operating cost of afterbody denitrification apparatus.Low NO
xone of core of combustion technology is grading combustion technology, comprises air classification and fuel staging two kinds, and fuel staging techniques is also called fuel and fires (reductive NO) technology again.The low NO of main flow that domestic and international pulverized-coal fired boiler adopts the most extensively, technology is the most ripe
xcombustion technology is air classification technology, and it is generally adopted at the station boiler of China.
Through finding the literature search of prior art, the classification of burner hearth integrated air the air capacity needed for burning is divided into two-stage send into, the air provided for burner in first-stage burning district accounts for coal dust and to burn completely 60% to 90% of requirement, and fuel first burns under the rich fuel condition of anoxic.In secondary firing district, by the remainder of the air of burning with auxiliary air (burnout degree) input, become oxygen-enriched combusting district.Oxygen concentration in the centre of I and II combustion zone close to zero the reducing zone with reducing atmosphere, the reducing medium in this region is for reducing the NO generated
xeffect clearly.In stove, integrated air classification technique can make NO
xgrowing amount reduces by 30% ~ 70%, and the degree of air classification is larger, and the share namely shared by burnout degree is larger, NO
xthe degree reduced discharging is larger.
Fig. 1, Fig. 3 and Fig. 4, for certain 600MW super critical boiler, describe existing burnout degree arrangement.Fig. 1 is III-III sectional view of Fig. 3 and Fig. 4, and Fig. 3 is I-I sectional view of Fig. 1, and Fig. 4 is II-II sectional view of Fig. 1, and in the drawings, 1 is boiler body, and 2 is burner hearths, and 3 is coal pulverizers, and 4 is pulverized coal channels, and 5 is First air coal nozzles, and 6 is overfire air jets.Every platform boiler 1 configures six coal pulverizers 3, and numbering is respectively A, B, C, D, E, F.Burner hearth 2 is made up of four sides water-cooling wall 7, each angle of burner hearth 2 is furnished with one group of main burner 8, often organize main burner 8 and vertically arrange that 6 First air coal nozzle 5(comprise surrounding air in interval), as 1 bugle, 6 First air coal nozzle 5(comprise surrounding air) be numbered A1, B1, C1, D1, E1, F1; 46, bugle First air coal nozzle 5(comprise surrounding air) be numbered A4, B4, C4, D4, E4, F4.Often organize burner 8 and vertically arrange 7 overfire air jets 6 in interval, the upper and lower of each First air coal nozzle 5 respectively has an overfire air jet 6.Be furnished with a compact burnout degree nozzle 11 in the top often organizing main burner 8, pass into part Secondary Air.The First air coal nozzle center line of corner burner 8 forms imaginary circle 9 in burner hearth 2.Coal pulverizer 3 is connected with First air coal nozzle 5 by pulverized coal channel 4, and every platform coal pulverizer 3 outlet has four pulverized coal channels 4, is connected with 4 First air coal nozzles 5 of same absolute altitude, such as coal pulverizer A be numbered A1, A2, A3, A4 totally four First air coal nozzles 5 connect.
Secondary Air is drawn from air preheater 13, by the first secondary air duct 14 and overfire air jet 6, the compact burnout degree nozzle 11 in main burner 8, and the surrounding air of First air coal nozzle 5 surrounding is connected, this part Secondary Air adds total combustion air amount of First air, be less than the coal dust spraying into burner hearth 2 by First air coal nozzle 5 to burn completely required theoretical air requirement, namely the excess air coefficient in main burner 8 region is less than 1.0.Remaining part Secondary Air by the second secondary air duct 15 be separated burnout degree bellows 10 and connect, spraying into burner hearth by being arranged on the separation burnout degree nozzle 12 be separated in burnout degree bellows 10, completing the process of whole burning.By such combustion method, the excess air coefficient in main burner region can be made to be less than 1.0, reduce nitrogen oxide (NO
x) growing amount.
Be arranged in the center line of the separation burnout degree nozzle 12 on corner, an intersection point is had with the center line of water-cooling wall 7, connect the center of circle shape of this intersection point and imaginary circle 19 in line, this straight line is four degree with the angle a of the center line being separated burnout degree nozzle 12, that is: a=4 °.
The ratio of the distance h1 at the center being separated burnout degree bellows 10 and the center of going up row's First air coal nozzle 5 most and distance H of center bottom large-size screen monitors 18 that go up row's First air coal nozzle 5 is most 0.3:1.The ratio that the air quality that described burnout degree nozzle 12 passes through accounts for the total air quality of boiler combustion is 20%.
In above-mentioned design example, the ratio of burnout degree is comparatively large on the impact of efficiency of combustion, and usual burnout degree ratio is higher, and efficiency of combustion is lower, putting into operation of burnout degree is also comparatively large on the impact of furnace outlet gas temperature deviation, and the design how optimizing burnout degree is problem demanding prompt solution.
Summary of the invention
The object of the invention is the design optimizing burnout degree, a kind of three grades of burnout degree arrangements with low-nitrogen oxide discharging amount, low unburned carbon in flue dust and low furnace outlet gas temperature deviation are provided.
In order to achieve the above object, technical scheme of the present invention there is provided a kind of three grades of burnout degree arrangements, comprise boiler body, burner hearth, coal pulverizer, pulverized coal channel, First air coal nozzle, overfire air jet, main burner, low level is separated burnout degree bellows, meta is separated burnout degree bellows, high-order separation burnout degree bellows and burner hearth Horizontal Exit pendant superheater, every platform boiler body configuration at least two coal pulverizers, burner hearth is made up of four sides water-cooling wall, each angle of burner hearth is furnished with one group of main burner, often organize main burner and vertically arrange at least two First air coal nozzles and three overfire air jets in interval, the upper and lower of each First air coal nozzle respectively has an overfire air jet, the center line of the First air coal nozzle of corner burner becomes imaginary circle at freeze profile, coal pulverizer is connected with First air coal nozzle by pulverized coal channel, every platform coal pulverizer outlet has four pulverized coal channels to be connected with four First air coal nozzles of same absolute altitude, Secondary Air is drawn from air preheater, part Secondary Air is connected by the gap of the first secondary air duct with the overfire air jet in main burner and First air coal nozzle surrounding, it is characterized in that, remaining a part of Secondary Air is further divided into three parts, part Secondary Air is separated burnout degree bellows by the second secondary air duct with low level and connects, the low level separation burnout degree nozzle be separated in burnout degree bellows by being arranged on low level sprays into burner hearth, a part of Secondary Air is separated burnout degree bellows by the 3rd secondary air duct with meta and connects in addition, the meta separation burnout degree nozzle be separated in burnout degree bellows by being arranged on meta sprays into burner hearth, last part Secondary Air is separated burnout degree bellows by the 4th secondary air duct with a high position and connects, burner hearth is sprayed into by being arranged on the high-order high position separation burnout degree nozzle be separated in burnout degree bellows.
Preferably, described low level is separated burnout degree bellows, described meta is separated burnout degree bellows and a described high position is separated on four angles that burnout degree bellows are arranged in burner hearth or on four sides wall, arranges that low level described in four groups is separated burnout degree bellows, meta described in four groups is separated burnout degree bellows and is separated burnout degree bellows with high-order described in four groups altogether.
Preferably, the direction of rotation of the low level imaginary circle that the center line that described low level is separated burnout degree nozzle is formed is identical with the direction of rotation of the imaginary circle of described main burner or contrary; The direction of rotation of the low level imaginary circle that the center line that described meta is separated burnout degree nozzle is formed is identical with the direction of rotation of the imaginary circle of described main burner or contrary; The direction of rotation of the first high-order imaginary circle that the center line that a described high position is separated burnout degree nozzle is formed or the second high-order imaginary circle is identical with the direction of rotation of the imaginary circle of described main burner or contrary.
Preferably, the low level be arranged on four sides wall is separated burnout degree nozzle, meta is separated burnout degree nozzle or the center line of the high-order center line and water-cooling wall that are separated burnout degree nozzle has an intersection point, connect the center of circle shape of this intersection point and described first high-order imaginary circle or described second high-order imaginary circle in line, the angle that this straight line is separated burnout degree nozzle with low level, meta is separated burnout degree nozzle or a high position is separated the center line of burnout degree nozzle is a, 1 °≤a≤80 °.
Preferably, the low level be arranged on front-back wall is separated burnout degree nozzle, the distance that meta is separated the edges and corners of burnout degree nozzle or the nearest burner hearth of the high-order intersection point being separated the center line of burnout degree nozzle and the center line of water-cooling wall is L1, 1/10Lw≤L1≤5/10Lw, Lw is the width of burner hearth, the low level be arranged on the side wall of left and right is separated burnout degree nozzle, the distance that meta is separated the edges and corners of burnout degree nozzle or the nearest burner hearth of the high-order intersection point being separated the center line of burnout degree nozzle and the center line of water-cooling wall is L2, 1/10Ld≤L2≤5/10Ld, Ld is the degree of depth of burner hearth.
Preferably, the center that low level is separated burnout degree bellows with go up most the distance h1 at center of row's First air coal nozzle and the ratio of the distance H of center bottom burner hearth Horizontal Exit pendant superheater that go up row's First air coal nozzle is most 0.1:1 ~ 0.5:1, the ratio that the air quality that low level separation burnout degree nozzle passes through accounts for the total air quality of boiler combustion is 5% ~ 25%.
Preferably, the ratio of the center that meta is separated burnout degree bellows is separated the center of burnout degree bellows distance h2 with low level and the distance H of center bottom burner hearth Horizontal Exit pendant superheater that go up row's First air coal nozzle is most 0.1:1 ~ 0.3:1, and the ratio that the air quality that meta burnout degree nozzle passes through accounts for the total air quality of boiler combustion is 5% ~ 25%.
Preferably, the ratio of the high-order center being separated burnout degree bellows is separated the center of burnout degree bellows distance h3 with meta and the distance H of center to burner hearth Horizontal Exit pendant superheater bottom that go up row's First air coal nozzle is most 0.1:1 ~ 0.3:1, and the ratio that the air quality that high position separation burnout degree nozzle passes through accounts for the total air quality of boiler combustion is 5% ~ 25%.
The invention has the beneficial effects as follows:
1, the present invention is separated burnout degree arrangement by employing three sections, by regulating the excess air coefficient in primary zone, after-flame I district, after-flame II district and after-flame III district in operation, is obtaining low NO
xwhile growing amount, unburned carbon in flue dust can be controlled in rational level, be separated compared with burnout degree arrangement with one section, add the flexibility of on-the-spot runing adjustment, coal and load variations can be adapted to better.
2, the present invention is separated burnout degree arrangement by employing three sections, can the turbulent closure scheme of idetified separation burnout degree and furnace high-temperature flue gas and uncombusted coke, raising efficiency of combustion.
3, the present invention is separated burnout degree arrangement by employing three sections, more effectively can eliminate the remaining swirl strength of flue gas of furnace outlet, improve the functional reliability of high-temperature surface.
In a word, the present invention can using integrated air classification technique control NO in bituminous coal and meager coal stove at present
xeffect 200 ~ 650mg/m
3on (during oxygen concentration of flue gas 6%) basis, realize NO
xlow emission, makes NO
xgrowing amount reduces about 15% again.Solve the fly ash combustible material that integrated air classification technique brings in stove high, the velocity of flue gas of furnace outlet and the problem such as temperature deviation is large, add the runing adjustment performance for Coal rank and load variations simultaneously.
Accompanying drawing explanation
Fig. 1 is the elevation of existing burnout degree arrangement;
Fig. 2 is the elevation of a kind of three grades of burnout degree arrangements of the present invention, main burner adopts quadrangle tangential circle to arrange, low level is separated burnout degree and adopts quadrangle tangential circle to arrange, meta is separated burnout degree and adopts quadrangle tangential circle to arrange, the high-order burnout degree that is separated adopts quadrangle tangential circle to arrange, is III-III sectional view of Fig. 3 and Fig. 4;
Fig. 3 is the plane of a kind of three grades of burnout degree arrangements of the present invention, and main burner adopts quadrangle tangential circle to arrange, is I-I sectional view of Fig. 2;
Fig. 4 is the plane of a kind of three grades of burnout degree arrangements of the present invention, low level is separated burnout degree and adopts quadrangle tangential circle to arrange, meta is separated burnout degree and adopts quadrangle tangential circle to arrange, the high-order burnout degree that is separated adopts quadrangle tangential circle to arrange, is II-II sectional view of Fig. 2 and Fig. 7;
Fig. 5 is the elevation of a kind of three grades of burnout degree arrangements of the present invention, and low level is separated burnout degree and adopts quadrangle tangential circle to arrange, meta is separated burnout degree and adopts quadrangle tangential circle to arrange, the high-order burnout degree that is separated adopts tangential-fired furnace to arrange, is III-III sectional view of Fig. 6;
Fig. 6 is the plane of a kind of three grades of burnout degree arrangements of the present invention, main burner adopts quadrangle tangential circle to arrange, low level is separated burnout degree and adopts quadrangle tangential circle to arrange, meta is separated burnout degree and adopts quadrangle tangential circle to arrange, the high-order burnout degree that is separated adopts tangential-fired furnace to arrange, is IV-IV sectional view of Fig. 5;
Fig. 7 is the elevation of a kind of three grades of burnout degree arrangements of the present invention, and low level is separated burnout degree and adopts quadrangle tangential circle to arrange, meta is separated burnout degree and adopts quadrangle tangential circle to arrange, the high-order burnout degree that is separated adopts tangential-fired furnace to arrange, is III-III sectional view of Fig. 8;
Fig. 8 is the plane of a kind of three grades of burnout degree arrangements of the present invention, main burner adopts quadrangle tangential circle to arrange, low level is separated burnout degree and adopts quadrangle tangential circle to arrange, meta is separated burnout degree and adopts quadrangle tangential circle to arrange, the high-order burnout degree that is separated adopts tangential-fired furnace to arrange, is IV-IV sectional view of Fig. 7.
Detailed description of the invention
For making the present invention become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Embodiment 1
Composition graphs 2, Fig. 3 and Fig. 4 illustrate present embodiment, and Fig. 3 is I-I sectional view of Fig. 2, and Fig. 4 is II-II sectional view of Fig. 2, and Fig. 2 is III-III sectional view of Fig. 3 and Fig. 4.
A kind of three grades of burnout degree arrangements provided by the invention comprise boiler body 1, burner hearth 2, coal pulverizer 3, pulverized coal channel 4, First air coal nozzle 5, overfire air jet 6, main burner 8, low level is separated burnout degree bellows 10, and meta is separated burnout degree bellows 16, high-order separation burnout degree bellows 30 and burner hearth Horizontal Exit pendant superheater 18.Every platform boiler 1 configures six coal pulverizers 3.Burner hearth 2 is made up of four sides water-cooling wall 7, each angle of burner hearth 2 is furnished with one group of main burner 8, often organize main burner 8 and vertically arrange six First air coal nozzles 5 and seven overfire air jets 6 in interval, the upper and lower of each First air coal nozzle 5 respectively has an overfire air jet 6.The center line of the First air coal nozzle 5 of corner burner 8 forms imaginary circle 9 in burner hearth 2.Coal pulverizer 3 is connected with First air coal nozzle 5 by pulverized coal channel 4, and every platform coal pulverizer 3 outlet has four pulverized coal channels 4, is connected with four First air coal nozzles 5 of same absolute altitude.
Secondary Air is drawn from air preheater 13, by the first secondary air duct 14 and the overfire air jet 6 in main burner 8, and the gap of First air coal nozzle 5 surrounding is connected, this part Secondary Air adds total combustion air amount of First air, be less than the coal dust spraying into burner hearth 2 by First air coal nozzle 5 to burn completely required theoretical air requirement, namely the excess air coefficient in main burner 8 region is less than 1.0.Remaining a part of Secondary Air is separated burnout degree bellows 10 by the second secondary air duct 15 with low level and connects, the low level separation burnout degree nozzle 12 be separated in burnout degree bellows 10 by being arranged on low level sprays into burner hearth 2, and low level is separated burnout degree bellows 10 and is arranged on four angles of burner hearth 2.Remaining a part of Secondary Air is separated burnout degree bellows 16 by the 3rd secondary air duct 32 with meta and connects, the meta separation burnout degree nozzle 17 be separated in burnout degree bellows 16 by being arranged on meta sprays into burner hearth 2, and meta is separated burnout degree bellows 16 and is arranged on four angles of burner hearth 2.Remaining other a part of Secondary Air is separated burnout degree bellows 30 by the 4th secondary air duct 33 with a high position and connects, and spraying into burner hearth 2, completing the process of whole burning by being arranged on the high-order high position separation burnout degree nozzle 31 be separated in burnout degree bellows 33.The high-order burnout degree bellows 30 that are separated are arranged on four angles of burner hearth 2.
The center line being arranged in the center line and water-cooling wall 7 that the low level on corner is separated burnout degree nozzle 12 has an intersection point, connect this intersection point and be separated the center of circle shape of burnout degree nozzle imaginary circle 19 with low level in line, this straight line is separated the center line of burnout degree nozzle 12 angle a with low level is four degree, that is: a=4 °.
The center line being arranged in the center line and water-cooling wall 7 that the meta on corner is separated burnout degree nozzle 17 has an intersection point, connect this intersection point and be separated the center of circle shape of burnout degree nozzle imaginary circle 19 with low level in line, this straight line is separated the center line of burnout degree nozzle 12 angle a with low level is four degree, that is: a=4 °.
The center line being arranged in the center line and water-cooling wall 7 that the high position on corner is separated burnout degree nozzle 31 has an intersection point, connect this intersection point and be separated the center of circle shape of burnout degree nozzle imaginary circle 19 with low level in line, this straight line is separated the center line of burnout degree nozzle 12 angle a with low level is four degree, that is: a=4 °.
The center that low level is separated burnout degree bellows 10 with go up most the distance h1 at center of row's First air coal nozzle 5 and the ratio of the distance H of center bottom burner hearth Horizontal Exit pendant superheater 18 that go up row's First air coal nozzle 5 is most 0.3:1.The ratio that the air quality that low level separation burnout degree nozzle 12 passes through accounts for the total air quality of boiler combustion is 15%.
The ratio of the center that meta is separated burnout degree bellows 16 is separated the center of burnout degree bellows 10 distance h2 with low level and the distance H of center bottom burner hearth Horizontal Exit pendant superheater 18 that go up row's First air coal nozzle 5 is most 0.15:1.The ratio that the air quality that meta separation burnout degree nozzle 16 passes through accounts for the total air quality of boiler combustion is 15%.
The ratio of the high-order center being separated burnout degree bellows 30 is separated the center of burnout degree bellows 16 distance h3 with meta and the distance H of center bottom burner hearth Horizontal Exit pendant superheater 18 that go up row's First air coal nozzle 5 is most 0.15:1.The ratio that the air quality that high-order separation burnout degree nozzle 31 passes through accounts for the total air quality of boiler combustion is 15%.
Low level is separated burnout degree nozzle 12, meta is separated burnout degree nozzle 17 and is separated burnout degree nozzle 31 with a high position, all left and right horizontal can swing each 25 degree.
Embodiment 2
Composition graphs 5, Fig. 3, Fig. 4 and Fig. 6 illustrate present embodiment, and Fig. 3 is I-I sectional view of Fig. 5, and Fig. 4 is II-II sectional view of Fig. 5, and Fig. 6 is IV-IV sectional view of Fig. 5, and Fig. 5 is III-III sectional view of Fig. 3, Fig. 4 and Fig. 6.
A kind of three grades of burnout degree arrangements provided by the invention comprise boiler body 1, burner hearth 2, coal pulverizer 3, pulverized coal channel 4, First air coal nozzle 5, overfire air jet 6, main burner 8, low level is separated burnout degree bellows 10, and meta is separated burnout degree bellows 16, high-order separation burnout degree bellows 30 and burner hearth Horizontal Exit pendant superheater 18.Every platform boiler 1 configures six coal pulverizers 3.Burner hearth 2 is made up of four sides water-cooling wall 7, each angle of burner hearth 2 is furnished with one group of main burner 8, often organize main burner 8 and vertically arrange six First air coal nozzles 5 and seven overfire air jets 6 in interval, the upper and lower of each First air coal nozzle 5 respectively has an overfire air jet 6.The center line of the First air coal nozzle 5 of corner burner 8 forms imaginary circle 9 in burner hearth 2.Coal pulverizer 3 is connected with First air coal nozzle 5 by pulverized coal channel 4, and every platform coal pulverizer 3 outlet has four pulverized coal channels 4, is connected with four First air coal nozzles 5 of same absolute altitude.
Secondary Air is drawn from air preheater 13, by the first secondary air duct 14 and the overfire air jet 6 in main burner 8, and the gap of First air coal nozzle 5 surrounding is connected, this part Secondary Air adds total combustion air amount of First air, be less than the coal dust spraying into burner hearth 2 by First air coal nozzle 5 to burn completely required theoretical air requirement, namely the excess air coefficient in main burner 8 region is less than 1.0.Remaining a part of Secondary Air is separated burnout degree bellows 10 by the second secondary air duct 15 with low level and connects, the low level separation burnout degree nozzle 12 be separated in burnout degree bellows 10 by being arranged on low level sprays into burner hearth 2, and low level is separated burnout degree bellows 10 and is arranged on four angles of burner hearth 2.Remaining a part of Secondary Air is separated burnout degree bellows 16 by the 3rd secondary air duct 32 with meta and connects, the meta separation burnout degree nozzle 17 be separated in burnout degree bellows 16 by being arranged on meta sprays into burner hearth 2, and meta is separated burnout degree bellows 16 and is arranged on four angles of burner hearth 2.Remaining other a part of Secondary Air is separated burnout degree bellows 30 by the 4th secondary air duct 33 with a high position and connects, and spraying into burner hearth 2, completing the process of whole burning by being arranged on the high-order high position separation burnout degree nozzle 31 be separated in burnout degree bellows 33.The high-order burnout degree bellows 30 that are separated are arranged on the four sides wall of burner hearth 2.
The center line being arranged in the center line and water-cooling wall 7 that the low level on corner is separated burnout degree nozzle 12 has an intersection point, connect this intersection point and be separated the center of circle shape of burnout degree nozzle imaginary circle 19 with low level in line, this straight line is separated the center line of burnout degree nozzle 12 angle a with low level is four degree, that is: a=4 °.
The center line being arranged in the center line and water-cooling wall 7 that the meta on corner is separated burnout degree nozzle 17 has an intersection point, connect this intersection point and be separated the center of circle shape of burnout degree nozzle imaginary circle 19 with low level in line, this straight line is separated the center line of burnout degree nozzle 12 angle a with low level is four degree, that is: a=4 °.
The high position be arranged on front-back wall is separated the intersection point of the center line of burnout degree nozzle 31 and the center line of water-cooling wall 7, and the distance L1 of the edges and corners of nearest burner hearth 2 is 1/2nd of the width Lw of burner hearth 2, that is: L1=1/2Lw, see Fig. 6.Equally, the high position be arranged on the side wall of left and right is separated the intersection point of the center line of burnout degree nozzle 31 and the center line of water-cooling wall 7, and the distance L2 of the edges and corners of nearest burner hearth 2 is 1/2nd of the degree of depth Ld of burner hearth 2, that is: L2=1/2Ld.
The center line being arranged in the center line and water-cooling wall 7 that the high position on front-back wall is separated burnout degree nozzle 31 has an intersection point, connect this intersection point and be separated the center of circle shape of the first imaginary circle 20 of burnout degree nozzle with a high position in line, this straight line is separated the center line of burnout degree nozzle 31 angle a with a high position is four degree, that is: a=4 °.
The center that low level is separated burnout degree bellows 10 with go up most the distance h1 at center of row's First air coal nozzle 5 and the ratio of the distance H of center bottom burner hearth Horizontal Exit pendant superheater 18 that go up row's First air coal nozzle 5 is most 0.3:1.The ratio that the air quality that low level separation burnout degree nozzle 12 passes through accounts for the total air quality of boiler combustion is 15%.
The ratio of the center that meta is separated burnout degree bellows 16 is separated the center of burnout degree bellows 10 distance h2 with low level and the distance H of center bottom burner hearth Horizontal Exit pendant superheater 18 that go up row's First air coal nozzle 5 is most 0.15:1.The ratio that the air quality that meta separation burnout degree nozzle 16 passes through accounts for the total air quality of boiler combustion is 15%.
The ratio of the high-order center being separated burnout degree bellows 30 is separated the center of burnout degree bellows 16 distance h3 with meta and the distance H of center bottom burner hearth Horizontal Exit pendant superheater 18 that go up row's First air coal nozzle 5 is most 0.15:1.The ratio that the air quality that high-order separation burnout degree nozzle 31 passes through accounts for the total air quality of boiler combustion is 15%.
Low level is separated burnout degree nozzle 12, meta is separated burnout degree nozzle 17 and is separated burnout degree nozzle 31 with a high position, all left and right horizontal can swing each 25 degree.
Embodiment 3
Composition graphs 7, Fig. 3, Fig. 4 and Fig. 8 illustrate present embodiment, and Fig. 3 is I-I sectional view of Fig. 7, and Fig. 4 is II-II sectional view of Fig. 7, and Fig. 8 is IV-IV sectional view of Fig. 7, and Fig. 7 is III-III sectional view of Fig. 3, Fig. 4 and Fig. 8.
The difference of the present embodiment and embodiment 2 is, the direction of rotation of the second imaginary circle 21 of the high position separation burnout degree nozzle that the center line that the high position be arranged on four walls is separated burnout degree nozzle 31 is formed and the imaginary circle 9 of main burner 8 are separated the low level imaginary circle 19 of after-flame bellows 10 direction of rotation with low level is contrary, see Fig. 7.
Meanwhile, being arranged in the distance L1 that a high position on front-back wall is separated the edges and corners of the nearest burner hearth 2 of the intersection point of the center line of burnout degree nozzle 31 and the center line of water-cooling wall 7 is 1/4th of the width Lw of burner hearth 2, that is: L1=1/4Lw, see Fig. 7.Equally, being arranged in the distance L2 that a high position on the side wall of left and right is separated the edges and corners of the nearest burner hearth 2 of the intersection point of the center line of burnout degree nozzle 31 and the center line of water-cooling wall 7 is 1/4th of the degree of depth Ld of burner hearth 2, that is: L2=1/4Ld.
The center line being arranged in the center line and water-cooling wall 7 that the high position on front-back wall is separated burnout degree nozzle 31 has an intersection point, connect this intersection point and be separated the center of circle shape of the imaginary circle 21 of burnout degree nozzle with a high position in line, this straight line is separated the center line of burnout degree nozzle 17 angle a with a high position is 25 degree, that is: a=25 °.Meanwhile, the center line of this straight line and front-back wall water-cooling wall 7 is perpendicular, i.e. angle b=90 °.
Other structures and result of the test are with embodiment 2.
Claims (6)
1. three grades of burnout degree arrangements, comprise boiler body (1), burner hearth (2), coal pulverizer (3), pulverized coal channel (4), First air coal nozzle (5), overfire air jet (6), main burner (8), low level is separated burnout degree bellows (10), meta is separated burnout degree bellows (16), high-order separation burnout degree bellows (30) and burner hearth Horizontal Exit pendant superheater (18), every platform boiler body (1) configuration at least two coal pulverizers (3), burner hearth (2) is made up of four sides water-cooling wall (7), each angle of burner hearth (2) is furnished with one group of main burner (8), often organize main burner (8) and vertically arrange at least two First air coal nozzles (5) and three overfire air jets (6) in interval, the upper and lower of each First air coal nozzle (5) respectively has an overfire air jet (6), the center line of the First air coal nozzle (5) of main burner (8) forms imaginary circle (9) in burner hearth (2), coal pulverizer (3) is connected with First air coal nozzle (5) by pulverized coal channel (4), every platform coal pulverizer (3) outlet has four pulverized coal channels (4) to be connected with four First air coal nozzles (5) of same absolute altitude, Secondary Air is drawn from air preheater (13), part Secondary Air is connected by the gap of the first secondary air duct (14) with the overfire air jet (6) in main burner (8) and First air coal nozzle (5) surrounding, it is characterized in that, remaining a part of Secondary Air is further divided into three parts, part Secondary Air is separated burnout degree bellows (10) by the second secondary air duct (15) with low level and connects, low level separation burnout degree nozzle (12) be separated in burnout degree bellows (10) by being arranged on low level sprays into burner hearth, a part of Secondary Air is separated burnout degree bellows (16) by the 3rd secondary air duct (32) with meta and connects in addition, meta separation burnout degree nozzle (17) be separated in burnout degree bellows (16) by being arranged on meta sprays into burner hearth (2), last part Secondary Air is separated burnout degree bellows (30) by the 4th secondary air duct (33) with a high position and connects, burner hearth is sprayed into by being arranged on high-order high position separation burnout degree nozzle (31) be separated in burnout degree bellows (30),
Low level is separated burnout degree bellows (10) and is arranged on four angles of burner hearth (2), meta is separated burnout degree bellows (16) and is arranged on four angles of burner hearth (2), high-order burnout degree bellows (30) that is separated is arranged on the four sides wall of burner hearth (2), and the direction of rotation of the second imaginary circle that the high position that the center line that the high position be arranged on four walls is separated burnout degree nozzle is formed is separated burnout degree nozzle and the imaginary circle of main burner are separated the low level imaginary circle of after-flame bellows direction of rotation with low level is contrary.
2. a kind of three grades of burnout degree arrangements as claimed in claim 1, it is characterized in that, the low level be arranged on four sides wall is separated burnout degree nozzle (12), the center line that meta is separated burnout degree nozzle (17) or the high-order center line and water-cooling wall (7) that are separated burnout degree nozzle (31) has an intersection point, connect the center of circle shape of this intersection point and described first high-order imaginary circle (20) or described second high-order imaginary circle (21) in line, this straight line is separated burnout degree nozzle (12) with low level, meta is separated burnout degree nozzle (17) or the high-order angle being separated the center line of burnout degree nozzle (31) is a, 1 °≤a≤80 °.
3. a kind of three grades of burnout degree arrangements as claimed in claim 1, it is characterized in that, the low level be arranged on front-back wall is separated burnout degree nozzle (12), the distance that meta is separated the edges and corners of burnout degree nozzle (17) or the nearest burner hearth (2) of the high-order intersection point being separated the center line of burnout degree nozzle (31) and the center line of water-cooling wall (7) is L1, 1/10Lw≤L1≤5/10Lw, Lw is the width of burner hearth (2), the low level be arranged on the side wall of left and right is separated burnout degree nozzle (12), the distance that meta is separated the edges and corners of burnout degree nozzle (17) or the nearest burner hearth (2) of the high-order intersection point being separated the center line of burnout degree nozzle (31) and the center line of water-cooling wall (7) is L2, 1/10Ld≤L2≤5/10Ld, Ld is the degree of depth of burner hearth (2).
4. a kind of three grades of burnout degree arrangements as claimed in claim 1, it is characterized in that, the center that low level is separated burnout degree bellows (10) with go up most the distance h1 at center of row's First air coal nozzle (5) and the ratio of the distance H of center bottom burner hearth Horizontal Exit pendant superheater (18) that go up row's First air coal nozzle (5) is most 0.1:1 ~ 0.5:1, the ratio that the air quality that low level separation burnout degree nozzle (12) passes through accounts for the total air quality of boiler combustion is 5% ~ 25%.
5. a kind of three grades of burnout degree arrangements as claimed in claim 1, it is characterized in that, the ratio of the center that meta is separated burnout degree bellows (16) is separated the center of burnout degree bellows (10) distance h2 with low level and the distance H of center bottom burner hearth Horizontal Exit pendant superheater (18) that go up row's First air coal nozzle (5) is most 0.1:1 ~ 0.3:1, and the ratio that the air quality that meta burnout degree nozzle (17) passes through accounts for the total air quality of boiler combustion is 5% ~ 25%.
6. a kind of three grades of burnout degree arrangements as claimed in claim 1, it is characterized in that, the high-order center being separated burnout degree bellows (30) is separated the center of burnout degree bellows (16) distance h3 with meta and the center of going up row's First air coal nozzle (5) are most 0.1:1 ~ 0.3:1 to the ratio of the distance H of burner hearth Horizontal Exit pendant superheater (18) bottom, and the ratio that the air quality that high position separation burnout degree nozzle (31) is passed through accounts for the total air quality of boiler combustion is 5% ~ 25%.
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| CN103335304B (en) * | 2013-06-28 | 2016-06-08 | 广东电网公司电力科学研究院 | Quadrangle tangential circle Combustion System of Boiler Burning Fine |
| CN104061567A (en) * | 2014-03-28 | 2014-09-24 | 广东电网公司电力科学研究院 | Low-nitrogen modified large-scale power station boiler device and application method thereof |
| CN108443866A (en) * | 2018-03-22 | 2018-08-24 | 上海锅炉厂有限公司 | A kind of vortex burner matches the combustion of industrial boiler system of circle of contact burnout degree |
| CN109578991B (en) * | 2018-11-30 | 2024-10-01 | 深圳妈湾电力有限公司 | Accurate air distribution system of pulverized coal boiler |
| CN115307130A (en) * | 2022-06-20 | 2022-11-08 | 中国大唐集团科学技术研究总院有限公司华东电力试验研究院 | Despin device for tangential firing boiler |
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