CN101644431B - Self-stabilizing three-stage air-distribution low-NOx pulverized coal burner - Google Patents
Self-stabilizing three-stage air-distribution low-NOx pulverized coal burner Download PDFInfo
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- CN101644431B CN101644431B CN2009101018891A CN200910101889A CN101644431B CN 101644431 B CN101644431 B CN 101644431B CN 2009101018891 A CN2009101018891 A CN 2009101018891A CN 200910101889 A CN200910101889 A CN 200910101889A CN 101644431 B CN101644431 B CN 101644431B
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Abstract
The invention discloses a self-stabilizing three-stage air-distribution low-NOx pulverized coal burner. A pre-burning chamber and a conical barrel formed by the cone expansion and extension of an internal secondary air duct are arranged in an external secondary bellows. A large end of the conical barrel is sheathed in an external secondary air passage formed by an opening at one end of the pre-burning chamber. A wall surface at the other end of the pre-burning chamber, which is closed with an external end face of the external secondary bellows, is provided with an annular tertiary air passage. A central air duct is coaxially arranged in a primary air duct. The primary air duct and a cone expanding end of the central air duct are both arranged in the conical barrel. The internal secondary air duct sheaths the outside of the primary air duct. An axial movable cyclone impeller is arranged in the internal secondary air duct. The outer end of the axial movable cyclone impeller is provided with an internal secondary air impeller pull rod. An annular passage of a separating plate is provided with an air regulator. The outer end of the air regulator is provided with an air regulating pull rod. The circumference at the inner end of the air regulating pull rod is equally divided to arrange sliding fins cooperating with an internal secondary bellows in a sliding manner. The burner has strong self-stabilization capability, can adjust a flame position, prevent slag formation in the pre-burning chamber and realize low NOx emission, and is capable of wide application in various industrial pulverized coal boilers.
Description
Technical field
The present invention relates to a kind of coal burner, relate in particular to a kind of three grades of air distribution low-NOx pulverized coal burners with self-stable ability.
Background technology
The coal-burned industrial boiler of China is in the majority with chain furnace, and its actual operating efficiency has only about 65%, and energy utilization rate is low.And the industrial coal powder boiler of employing suspension combustion mode then has higher boiler efficiency.Coal dust burning on Industrial Boiler, the design of burner are crucial.Because the furnace cavity of Industrial Boiler is less, this just requires burner should be able to organize the interior flow field of stove preferably, and coal dust can be burnt efficiently and stably, can avoid ash erosion to produce, and has low NO simultaneously again
XDischarge function.And the coal burner of putting into operation now is applied to power plant mostly, is applicable to that the coal burner of Industrial Boiler is then less.
Summary of the invention
At the problem of above existence, the object of the present invention is to provide a kind of three grades of air distribution low-NOx pulverized coal burners that are applicable to that Industrial Boiler is used with self-stable ability.
The technical solution used in the present invention is:
The dividing plate that secondary air box of the present invention has a circular hole by the center is divided into outer secondary air box and the interior secondary air box of secondary wind inlet is arranged, the conically shaped that columnar precombustion chamber and interior secondary air channel reamer extend to form is set in the described outer secondary air box, the coaxial sky of precombustion chamber overlaps outside in the secondary air box, have the tertiary air road of annular on the wall of one end of precombustion chamber and the sealing of outer secondary air box outer face, the aperture that the big end of conically shaped is inserted in the other end of precombustion chamber forms annular outer secondary air duct; In the described interior secondary air box, central air hose is coaxial to be installed in airduct, the central air hose import is passed wind pipe wall and is tilted to be installed on airduct, and the reamer end of airduct and central air hose all is positioned at conically shaped, and the reamer of central air hose exposes outside airduct; Interior secondary air channel is set in outside airduct, be axially moveable the eddy flow impeller be installed in in the secondary air channel, be axially moveable the eddy flow impeller outer install in secondary fan blade pull bar, be axially moveable eddy flow impeller inner ring and an airduct outer ring for being slidingly matched; The place, circular passage of dividing plate is equipped with air register, and the air register outer end is installed and transferred the wind pull bar, and five equilibrium is installed slip muscle sheet on the air register circumference, and slip muscle sheet and interior secondary air box are for being slidingly matched.
The cone angle of the reamer end of a described airduct and central air hose is identical, is 90 °～100 °.
The beneficial effect that the present invention has is:
1, the present invention is provided with swirl vane in secondary air channel, makes through the air-flow of swirl vane and produces rotation, is formed with to be beneficial to the recirculating zone that catches fire, and makes that coal dust is easier to be lighted;
2, eddy flow impeller of the present invention is arranged to be axially moveable, the swirl strength of secondary wind in conveniently regulating, thus regulate the interior air current flow situation of burner, improve combustion efficiency;
3, secondary air box dividing plate of the present invention has the circular passage, secondary air box and outer secondary air box in the UNICOM, air register is installed at the place, circular passage, and this device can flexible modulation enter the air quantity of outer secondary air box, thereby regulate the air quantity ratio of inside and outside secondary wind, improve the combustion case in the burner;
4, the present invention has adopted precombustion chamber, can form the thermal source that makes breeze airflow stable ignition and burning in precombustion chamber;
5, the present invention has center wind, adjustable coal saving powder ignition point;
6, three grades of air distribution modes of secondary wind, outer secondary wind and tertiary air both can prevent the precombustion chamber slagging scorification in the present invention adopted, and had the NOx of reduction discharge function again;
7, new structure of the present invention is evenly distributed the ignition temperature of pulverized coal flame in boiler furnace, the phenomenon of hot-spot can not occur;
8, the present invention is applicable to various small and medium-sized industrial coal powder boilers, in use has higher efficiency of combustion.
Description of drawings
Fig. 1 is a structural principle schematic diagram of the present invention.
Fig. 2 is the A enlarged drawing of Fig. 1.
Fig. 3 is that the B-B of Fig. 1 is to view.
Fig. 4 is a structural representation of transferring the wind pull bar.
Fig. 5 is the upward view of Fig. 4.
Among the figure: 1, airduct, 2, central air hose, 3, the central air hose import, 4, interior secondary air channel, 5, outer secondary air duct, 6, the tertiary air road, 7, precombustion chamber, 8, dividing plate, 9, interior secondary air box, 10, outer secondary air box, 11, secondary wind inlet, 12, reamer, 13, be axially moveable the eddy flow impeller, 14, interior secondary fan blade pull bar, 15, the circular passage, 16, air register, 17, transfer the wind pull bar, 18, flange, 19, slip muscle sheet.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As Fig. 1～shown in Figure 5, secondary air box of the present invention is divided into interior secondary air box 9 and the outer secondary air box 10 that secondary wind inlet 11 is arranged by the dividing plate 8 that the center has circular hole, the conically shaped that columnar precombustion chamber 7 and interior secondary air channel 4 reamers extend to form is set in the described outer secondary air box 10, precombustion chamber 7 coaxial skies overlap outside in the secondary air box 10, have the tertiary air road 6 of annular on the wall of one end of precombustion chamber 7 and the sealing of outer secondary air box 10 outer faces, the aperture that the big end of conically shaped is inserted in the other end of precombustion chamber 7 forms annular outer secondary air duct 5; In the described interior secondary air box 9, central air hose 2 is coaxial to be installed in airduct 1, central air hose import 3 is passed wind pipe wall and is tilted to be installed on airduct 1, and the reamer end of airduct 1 and central air hose 2 all is positioned at conically shaped, and the reamer 12 of central air hose 2 exposes outside airduct 1; Interior secondary air channel 4 is set in outside airduct 1, be axially moveable eddy flow impeller 13 be installed in in the secondary air channel 4, be axially moveable secondary fan blade pull bar 14 in eddy flow impeller 13 outer the installations, be axially moveable eddy flow impeller 13 inner rings and airduct 1 outer ring for being slidingly matched; 15 places, circular passage of dividing plate 8 are equipped with air register 16, and air register 16 outer ends are installed and transferred wind pull bar 17, and five equilibrium is installed slip muscle sheet 19 on the inner circumference of accent wind pull bar 17, and slip muscle sheet 19 and interior secondary air box 9 are for being slidingly matched.
The cone angle of the reamer end of a described airduct 1 and central air hose 2 is identical, is 90 °～100 °.
Secondary fan blade pull bar 14 and accent wind pull bar 17 usefulness flanges 18 are supported on the burner front end in described.
When the present invention installs, an airduct 1 is connected power transportation pipe (not marking among Fig. 1), central air hose import 3 and secondary wind inlet 11 are connected a blower fan (not shown in figure 1) respectively, whole burner is connected on the fire tube of horizontal industrial pulverized-coal fired boiler device with flange.
The course of work of the present invention is as follows:
Burner hearth is earlier with after 10 seconds of igniting air gun (not shown in figure 1) preheating, open blower fan, breeze airflow is entered by an airduct 1, reamer 10 places ejection along central air hose 2, and the combustion gas of having been burnt is lighted, open secondary wind inlet 11 simultaneously, at this moment, secondary wind enters interior secondary air box 9, and enters outer secondary air box 10 by the circular passage on the dividing plate 8 15, then respectively by interior secondary air channel 4, outer secondary air duct 5 enters burner, and there is the part air to enter burner hearth by tertiary air road 6, secondary wind in realizing, three grades of air distribution modes of outer secondary wind and tertiary air reach air classification and supply with, and reduce NO
XDischarging.Coal dust lighted and with combustion gas cofiring after 10 seconds, close the igniting air gun, fully by coal dust firing.After the air communication of interior secondary air channel 4 is crossed and is axially moveable eddy flow impeller 13, produce rotation, (promptly at central air hose reamer 12 afterbodys) form the recirculating zone at the center behind the outflow spout, entrainment the high-temperature flue gas in the stove, heating and firing coal-dust.The swirl strength of interior secondary general mood stream is regulated by being axially moveable swirl vane 13, and secondary fan blade pull bar 14 can be realized the continuous adjusting of swirl strength in stretching, thereby improves combustion efficiency.The air-flow of outer secondary air duct 5 flows along precombustion chamber 7 walls, not only provides the coal dust after burning required oxygen, and has effectively prevented slagging scorification in the precombustion chamber 7.Outer secondary general mood stream is regulated by the air register 16 at 15 places, dividing plate circular passage, transfers wind pull bar 17 can regulate outer secondary wind air quantity by stretching.The ignition point of coal dust can be regulated by the wind speed that changes in the central air hose 2.
Claims (2)
1. three grades of air distribution low-NOx pulverized coal burners with self-stable ability, it is characterized in that: the dividing plate (8) that secondary air box has a circular hole by the center is divided into outer secondary air box (10) and the interior secondary air box (9) of secondary wind inlet (11) is arranged, the conically shaped that columnar precombustion chamber (7) and interior secondary air channel (4) reamer extend to form is set in the described outer secondary air box (10), the coaxial sky of precombustion chamber (7) overlaps outside in the secondary air box (10), have the tertiary air road (6) of annular on the wall of one end of precombustion chamber (7) and the sealing of outer secondary air box (10) outer face, the aperture that the big end of conically shaped is inserted in the other end of precombustion chamber (7) forms annular outer secondary air duct (5); In the described interior secondary air box (9), central air hose (2) is coaxial to be installed in the airduct (1), central air hose import (3) is passed a wind pipe wall and is tilted to be installed on the airduct (1), the reamer end of an airduct (1) and central air hose (2) all is positioned at conically shaped, and the reamer (12) of central air hose (2) exposes outside the airduct (1); Interior secondary air channel (4) is set in outside the airduct (1), being axially moveable eddy flow impeller (13) is installed in the interior secondary air channel (4), be axially moveable secondary fan blade pull bar (14) in the outer installation of eddy flow impeller (13), be axially moveable eddy flow impeller (13) inner ring and an airduct (1) outer ring for being slidingly matched; Air register (16) is located to be equipped with in the circular passage (15) of dividing plate (8), and air register (16) outer end is installed and transferred wind pull bar (17), and five equilibrium is installed slip muscle sheet (19) on air register (16) circumference, and slip muscle sheet (19) and interior secondary air box (9) are for being slidingly matched.
2. a kind of three grades of air distribution low-NOx pulverized coal burners with self-stable ability according to claim 1, it is characterized in that: a described airduct (1) is identical with the cone angle of the reamer end of central air hose (2), is 90 °～100 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101018891A CN101644431B (en) | 2009-08-31 | 2009-08-31 | Self-stabilizing three-stage air-distribution low-NOx pulverized coal burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101018891A CN101644431B (en) | 2009-08-31 | 2009-08-31 | Self-stabilizing three-stage air-distribution low-NOx pulverized coal burner |
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| CN101644431A CN101644431A (en) | 2010-02-10 |
| CN101644431B true CN101644431B (en) | 2011-02-02 |
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| CN103104925A (en) * | 2013-02-01 | 2013-05-15 | 浙江特富锅炉有限公司 | Burner for combustion chemical waste gas |
| CN110307538A (en) * | 2018-03-20 | 2019-10-08 | 中国科学院工程热物理研究所 | Coal dust flameless combustion systems and method |
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| CN102305397A (en) * | 2011-09-08 | 2012-01-04 | 上海题桥能源科技发展有限公司 | Low-NOX (nitrogen oxides) slag-tap pulverized coal combustion device with triple rotational air |
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| CN103104925A (en) * | 2013-02-01 | 2013-05-15 | 浙江特富锅炉有限公司 | Burner for combustion chemical waste gas |
| CN110307538A (en) * | 2018-03-20 | 2019-10-08 | 中国科学院工程热物理研究所 | Coal dust flameless combustion systems and method |
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| CN101644431A (en) | 2010-02-10 |
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