CN104613466A - Double-volute swirl type pulverized coal burner provided with natural gas spray pipe and pre-burning chamber - Google Patents
Double-volute swirl type pulverized coal burner provided with natural gas spray pipe and pre-burning chamber Download PDFInfo
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- CN104613466A CN104613466A CN201510022488.2A CN201510022488A CN104613466A CN 104613466 A CN104613466 A CN 104613466A CN 201510022488 A CN201510022488 A CN 201510022488A CN 104613466 A CN104613466 A CN 104613466A
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Abstract
The invention discloses a double-volute swirl type pulverized coal burner provided with a natural gas spray pipe and a pre-burning chamber. The burner mainly comprises a double-volute burner, the natural gas spray pipe, a natural gas-air nozzle, a central air pipe flaring, a primary air pipe flaring, the pre-burning chamber and a rear secondary air duct. Combustion of low-volatile coal is supported in a natural gas feeding manner, and the natural gas can increase coal dust volatiles through phase conversion at the preliminary stage of pulverized coal combustion through reasonable structure design; a good air dynamic field is organized through structure design and reasonable air distribution, so that the low-volatile pulverized coal can be timely ignited, stably burned and efficiently burnt out. The double-volute swirl type pulverized coal burner is simple in structure, convenient to modify, capable of efficiently burning the low-volatile pulverized coal and particularly suitable for structure transformation of a small industrial boiler burner, and can be widely applied to the low-volatile pulverized coal burnt on an industrial boiler.
Description
Technical field
The present invention relates to low volatile pulverized coal field of combustion technology, particularly a kind of double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber.
Background technology
China's primary energy is mainly based on coal, and China is one of country that coal reserves is the abundantest in the world.One large feature of the disposable quantity of energy of China is exactly oil-poor, weak breath, rich coal, under such energy resource structure background, greatly develop coal application technology in the industry and just become the trend in epoch, coal resources also will occupy the leading position of China's industrial application energy within the present and following a very long time.Because the coal resources of China are compared with the energy of other kind, comparatively abundant, and country is in the period of rapid economic development at present, energy demand sustainable growth, relevant expert carries out long-term forecast to China's energy and thinks, within very long one period in future, coal in China proportion in the consumption of primary energy will be not less than 60%.
The low-volatite coal such as China's meager coal, anthracite are distributed widely in the ground such as Hubei, Henan, Shanxi, Fujian, Shandong, and resource is extremely abundant, accounts for more than 16% of coal resources in China.These coals due to volatile matter rate of release low, ignition temperature is high, flammable poor performance, and pole not easily catches fire and after-flame, and peaking operation is very difficult especially.Compared with other coals, anthracite belongs to and buries age coal of a specified duration.Typical anthracite has that phosphorus content is high, caloric value is high, ash fusion point is high and low volatile, low ash content, low sulfur content feature, i.e. so-called " three high three low ".
Cause low-volatite coal catch fire difficulty, combustion instability one of the main reasons be that its volatile matter content is low, enough heats can not be provided at coal powder ignition and burning initial stage.Therefore, design a kind of double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber, the volatile matter of separating out when substituting coal powder ignition by the method filling into natural gas, the covert volatile matter content increasing low-volatite coal.Natural gas sprays into precombustion chamber and mixes with the coal dust in First air in time in central air hose with air pre-mixing, the reducing of primary air piping enlarging design can concentrate the coal dust in First air, ensure that in precombustion chamber, Central backflow area has higher coal powder density, and fully can mix with the natural gas that premix catches fire, make natural gas can play the effect of the volatile matter that better coal dust is separated out.
Summary of the invention
The object of the invention is to design and a kind ofly utilize the band natural gas jet pipe of natural gas combustion-supporting coal dust and the double volute spiral coal powder burner of precombustion chamber, realize that low volatile pulverized coal catches fire in time, smooth combustion and efficient after-flame.
Above-mentioned purpose of the present invention is realized by following technical proposal:
A kind of double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber, comprise double volute burner, natural gas jet pipe, central air hose enlarging, primary air piping enlarging, natural gas-air nozzle, precombustion chamber and rear secondary air duct, described double volute burner comprises First air spiral case, Secondary Air spiral case, front secondary air channel, front Secondary Air swirl vane, primary air piping and central air hose, and front secondary swirl vane is arranged on front secondary wind tube outlet place; Described natural gas jet pipe is arranged in double volute burner centre airduct; Described natural gas-air nozzle is arranged on central air hose exit; Described central air hose enlarging is arranged on central air hose exit; Described First air enlarging is arranged on primary air piping exit; Described precombustion chamber is connected with the front secondary wind tube outlet of double volute burner; Described rear secondary air duct wraps in outside precombustion chamber, and its outlet is connected with burner hearth, and exit arranges rear Secondary Air swirl vane.
Adopt double volute vortex burner to transform, front Secondary Air is close to outside First air, with in the past with precombustion chamber burner compared with, structure is simple, and transformation is convenient; Front swirl secondary air separates with coal dust First air, First air arranges less swirl strength, and increase front secondary wind speed by reducing front secondary dust diameter, can ensure that precombustion chamber forms stable, enough large high temperature recirculation zone, can ensure that again coal dust and precombustion chamber inwall are separated by Secondary Air, avoid coal dust to wash away precombustion chamber inwall and cause slagging scorification; The front Secondary Air that wind speed is higher can also purge precombustion chamber inwall, avoids precombustion chamber accumulated powder; This structure has given full play to the effect of precombustion chamber, turn avoid the shortcoming of precombustion chamber; Pure natural gas, from the ejection of natural gas jet pipe, in natural gas-air pre-mixing section and air pre-mixing, not only ensures the security of combustion of natural gas but also ensures that natural gas catches fire in time.
Described natural gas jet pipe is arranged in central air hose, and natural gas jet pipe and natural gas-air nozzle have the natural gas-air pre-mixing section of 800 ~ 1000mm, not only ensure the security of combustion of natural gas but also ensure that natural gas catches fire in time; Described natural gas-air nozzle structure is conical round table, and its sidewall has the passage of several same size and with central air hose enlarging with certain angular compliance, can ensure that natural gas fully mixes with coal dust, can ensure that again coal dust can not dispel by natural gas.
Described natural gas-air nozzle sidewall and central air hose enlarging angle α are 60 ° ~ 100 ° (preferred angle α is 72 ~ 75 °); Central air hose enlarging and axis angle β 0 and First air enlarging and axis angle β 1 select 30 ° ~ 70 ° (wherein, β 0 preferably 40 °, β 1 preferably 45 °), First air enlarging is with annular reducing, its reducing and axis angle θ 0 are more than or equal to 0 °, preferred angle theta
012 ° ~ 15 °, can ensure that coal dust concentrates in precombustion chamber high temperature recirculation zone like this, be unlikely to again the contact circumference too reducing coal dust and recirculating zone high-temperature flue gas; Described precombustion chamber entrance and axis angle β 2 are 35 ° ~ 90 ° (preferred β 2 is 50 ° ~ 55 °), precombustion chamber barrel and axis angle θ 3 are for being more than or equal to 0 ° (preferred angle theta 3 is 5 °), precombustion chamber exit is with reducing, and its reducing and axis have suitable angle theta 1; The angle theta 1(that described rear secondary air duct outlet and the angle theta 2 of axis are more than or equal to precombustion chamber exit reducing sidewall and axis preferably after secondary air duct 7 to export with axis angle θ 2 larger than θ 15 °), precombustion chamber outlet, with reducing, is not only conducive to the precombustion chamber stable high temperature recirculation zone of interior formation but also can ensure that the coal dust burnt enters the recirculating zone in burner hearth and do not dispelled by rear Secondary Air.The outlet of rear Secondary Air is in precombustion chamber outlet outside, and its angle of inclination and precombustion chamber reducing angle have suitable differential seat angle, make recirculating zone in burner hearth more stable, and is conducive to not dispelled from precombustion chamber coal dust out.
Described natural gas-air nozzle, central air hose enlarging and primary air piping enlarging to fiery side coating fire-resistant material.
Described precombustion chamber is rolled by heat resisting steel and forms, inner lining refractory.
Adopt after technique scheme, the invention has the beneficial effects as follows: natural gas can be utilized in a disguised form to increase volatilization component required for coal dust firing, and by precombustion chamber and other devices, realize the catching fire in time of low-volatite coal, smooth combustion and efficient after-flame; Transformation is simple, is applicable to being arranged on low volatile coal dust on small-sized industrial boiler.
Accompanying drawing explanation
Fig. 1 is the double volute turbulent burner structural representation with natural gas spout and precombustion chamber;
Fig. 2 is double volute burner structure schematic diagram;
Fig. 3 is natural gas-air nozzle structural representation;
Fig. 4 is burner's angle parameter schematic diagram;
Main member symbol description
1, double volute burner 101, First air spiral case
102, Secondary Air spiral case 103, primary air piping
104, front secondary air channel 105, central air hose
106, front Secondary Air swirl vane 2, natural gas jet pipe
3, central air hose enlarging 4, primary air piping enlarging
5, natural gas-air nozzle 501, passage
6, precombustion chamber 7, rear secondary air duct
8, hearth wall 9, natural gas-air pre-mixing section.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
embodiment: a kind of double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber, as shown in the figure, double volute burner 1, natural gas jet pipe 2, central air hose enlarging 3, primary air piping enlarging 4, natural gas-air nozzle 5, precombustion chamber 6 and rear secondary air duct 7 is comprised.Double volute burner 1 comprises First air spiral case 101, Secondary Air spiral case 102, front secondary air channel 104, front Secondary Air swirl vane 106, primary air piping 103 and central air hose 105, and front secondary swirl vane 106 is arranged on front secondary air channel 104 exit.Natural gas jet pipe 2 is arranged in double volute burner 1 central air hose 105.Natural gas-air nozzle 5 is arranged on central air hose 105 exit; Described central air hose enlarging 3 is arranged on central air hose 105 exit.First air enlarging 4 is arranged on primary air piping 103 exit.Precombustion chamber 6 exports with the front secondary air channel 104 of double volute burner 1 and is connected.Rear secondary air duct 7 wraps in outside precombustion chamber 6, and its outlet is connected with burner hearth, and exit arranges rear Secondary Air swirl vane.Natural gas jet pipe 2 is arranged in central air hose 105, and natural gas jet pipe 2 and natural gas-air nozzle 5 have the natural gas-air pre-mixing section 9 of 800 ~ 1000mm, not only ensure the security of combustion of natural gas but also ensure that natural gas catches fire in time.Natural gas-air nozzle 5, central air hose enlarging 3 and primary air piping enlarging 4 to fiery side coating fire-resistant material.Natural gas-air nozzle 5 structure is conical round table, and its sidewall has the passage 501 of several same size and with central air hose enlarging with certain angular compliance, can ensure that natural gas fully mixes with coal dust, can ensure that again coal dust can not dispel by natural gas.
Natural gas-air nozzle 5 sidewall and central air hose enlarging 3 angle α are 60 ° ~ 100 °, and prioritizing selection angle α is 72 ° ~ 75 °.Central air hose enlarging 3 and axis angle β 0, First air enlarging 4 are 30 ° ~ 70 ° with axis angle β 1, wherein, and β 0 prioritizing selection 40 °, β 1 prioritizing selection 45 °.First air enlarging 4 is with annular reducing, its reducing and axis angle θ 0 are more than or equal to 0 °, prioritizing selection angle theta 12 ° ~ 15 °, can ensure that coal dust concentrates in precombustion chamber high temperature recirculation zone like this, be unlikely to again the contact circumference too reducing coal dust and recirculating zone high-temperature flue gas.Precombustion chamber 6 is rolled by heat resisting steel and forms, inner lining refractory.Precombustion chamber entrance and axis angle β 2 are 35 ° ~ 90 °, and prioritizing selection β 2 is 50 ° ~ 55 °.Precombustion chamber barrel and axis angle θ 3 are for being more than or equal to 0 °, and prioritizing selection angle theta 3 is 5 °.Precombustion chamber exit is with reducing, and its reducing and axis have suitable angle theta 1 to be not only conducive to forming stable high temperature recirculation zone but also ensureing that the coal dust burnt enters the recirculating zone in burner hearth and do not dispelled by rear Secondary Air in precombustion chamber.Rear secondary air duct outlet is more than or equal to precombustion chamber exit reducing sidewall and axial angle theta 1 with the angle theta 2 of axis, specifically can select large 5 °.The outlet of rear Secondary Air is in precombustion chamber outlet outside, and its angle of inclination and precombustion chamber reducing angle have suitable differential seat angle, make recirculating zone in burner hearth more stable, and is conducive to not dispelled from precombustion chamber coal dust out.
In running, coal dust enters precombustion chamber 6 through First air spiral case 101, primary air piping 103, is concentrated on the natural gas mixed combustion of precombustion chamber 6 Central backflow area and burning by central air hose enlarging 3, primary air piping enlarging 4.Natural gas jet pipe 2 is arranged in central air hose 105, and pure natural gas via natural gas jet pipe 2 natural gas-air pre-mixing section 9 in central tube fully mixes with air, and natural gas is caught fire in time.Natural gas-air nozzle 5 is arranged on central air hose 105 exit, and natural gas-air nozzle 5 sidewall and the angle of central air hose enlarging 3 ensure that the natural gas burnt can mix with coal dust in time and be unlikely to dispel coal dust.Front Secondary Air enters precombustion chamber 6 through Secondary Air spiral case 102, front secondary air channel 104, front Secondary Air swirl vane 106, and front overfire air port arranges less nozzle diameter, to increase its wind speed and swirl strength thereof.Front Secondary Air Main Function entrainments high-temperature flue gas in precombustion chamber, purges precombustion chamber 6 wall place's coal dust and avoid coal dust in First air to wash away precombustion chamber 6 wall causing slagging scorification or accumulated powder.Primary air piping enlarging 4 is provided with reducing, its Main Function is that the coal dust can assembled in centre wind is unlikely to again to reduce the Contact Boundary between coal dust and high-temperature flue gas, ensure that coal dust concentrates on high concentration of natural gas district, high coal powder density district, high-temperature region, make coal powder ignition more timely.Precombustion chamber 6 outlet is connected with burner hearth, reducing is arranged in precombustion chamber 6 exit, its Main Function is that before coordinating, Secondary Air forms stable recirculating zone in precombustion chamber 6, and in make the coal dust of burning concentrate on recirculating zone that rear Secondary Air formed in burner hearth, what ensure that the coal dust of burning can not be too early mixes with rear Secondary Air and is dispelled.Rear Secondary Air outlet is connected with burner hearth and arranges swirl vane, rear Secondary Air outlet is more than or equal to precombustion chamber reducing and axial angle theta 1 with axis angle θ 2, can ensure that freeze profile becomes stably high temperature recirculation zone, make again the coal dust sprayed by precombustion chamber 6 concentrate on border, burner hearth recirculating zone, the Contact Boundary increasing backflow flue gas in coal dust and burner hearth is not dispelled.The recirculating zone that freeze profile becomes can be connected with the recirculating zone in precombustion chamber 6, for precombustion chamber 6 provides more thermal source.
The above, be only present pre-ferred embodiments, each part be furnished with various ways, therefore scope of the invention process can not be limited with this, namely the equivalence done according to the present patent application the scope of the claims and description changes and modifies, and all should still remain within the scope of the patent.
Claims (5)
1. the double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber, comprise double volute burner (1), natural gas jet pipe (2), central air hose enlarging (3), primary air piping enlarging (4), natural gas-air nozzle (5), precombustion chamber (6) and rear secondary air duct (7), it is characterized in that: described double volute burner (1) comprises First air spiral case (101), Secondary Air spiral case (102), front secondary air channel (104), front Secondary Air swirl vane (106), primary air piping (103) and central air hose (105), front secondary swirl vane (106) is arranged on front secondary air channel (104) exit, described natural gas jet pipe (2) is arranged in double volute burner (1) central air hose (105), described natural gas-air nozzle (5) is arranged on central air hose (105) exit, described central air hose enlarging (3) is arranged on central air hose (105) exit, described First air enlarging (4) is arranged on primary air piping (103) exit, described precombustion chamber (6) exports with the front secondary air channel (104) of double volute burner (1) and is connected, described rear secondary air duct (7) wraps in precombustion chamber (6) outside, and its outlet is connected with burner hearth, and exit arranges rear Secondary Air swirl vane.
2. the double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber according to claim 1, it is characterized in that: described natural gas jet pipe (2) is arranged in central air hose (105), natural gas jet pipe (2) and natural gas-air nozzle (5) have the natural gas-air pre-mixing section (9) of 800 ~ 1000mm; Described natural gas-air nozzle (5) structure is conical round table, and its sidewall has the passage (501) of several same size.
3., according to claim 1 and the rotating pulverized coal flow burner of double volute with natural gas jet pipe and precombustion chamber according to claim 2, it is characterized in that: described natural gas-air nozzle (5) sidewall and central air hose enlarging (3) angle α are 60 ° ~ 100 °; Central air hose enlarging (3) and axis angle β 0 and First air enlarging (4) are 30 ° ~ 70 ° with axis angle β 1, and First air enlarging (4) is with reducing, and its reducing and axis angle θ 0 are more than or equal to 0 °; Described precombustion chamber entrance and axis angle β 2 are 35 ° ~ 90 °, and precombustion chamber barrel and axis angle θ 3 are for being more than or equal to 0 °, and precombustion chamber exit is with reducing, and its reducing and axis have suitable angle theta 1; Described rear secondary air duct outlet is more than or equal to precombustion chamber exit reducing sidewall and axial angle theta 1 with the angle theta 2 of axis.
4., according to claim 1 and the rotating pulverized coal flow burner of double volute with natural gas jet pipe and precombustion chamber according to claim 2, it is characterized in that: described natural gas-air nozzle (5), central air hose enlarging (3) and primary air piping enlarging (4) to fiery side coating fire-resistant material.
5., according to claim 1 and the rotating pulverized coal flow burner of double volute with natural gas jet pipe and precombustion chamber according to claim 2, it is characterized in that: described precombustion chamber (6) is rolled by heat resisting steel and forms, inner lining refractory.
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| CN201510022488.2A CN104613466B (en) | 2015-01-17 | 2015-01-17 | A kind of double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber |
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| CN201510022488.2A CN104613466B (en) | 2015-01-17 | 2015-01-17 | A kind of double volute spiral coal powder burner with natural gas jet pipe and precombustion chamber |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106439823A (en) * | 2016-08-30 | 2017-02-22 | 南阳市亚龙筑路机械制造有限公司 | Coal and oil mixing burner |
| CN106705039A (en) * | 2017-03-06 | 2017-05-24 | 中国华能集团清洁能源技术研究院有限公司 | Low-load stable combustion rotational flow type burner |
| CN106838895A (en) * | 2017-03-06 | 2017-06-13 | 中国华能集团清洁能源技术研究院有限公司 | A kind of low-load combustion-stabilizing once-through type burner |
| CN108397774A (en) * | 2018-05-10 | 2018-08-14 | 西安交通大学 | It is a kind of to be used for natural gas and the coal dust individually burner of burning or multifuel combustion |
| CN112902147A (en) * | 2021-02-07 | 2021-06-04 | 哈尔滨工业大学 | Pre-combustion chamber combustion device for co-combustion of low-volatile solid fuel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112902147A (en) * | 2021-02-07 | 2021-06-04 | 哈尔滨工业大学 | Pre-combustion chamber combustion device for co-combustion of low-volatile solid fuel |
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