CN214038382U - Micro-gas ignition combustion-supporting combustion device - Google Patents
Micro-gas ignition combustion-supporting combustion device Download PDFInfo
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- CN214038382U CN214038382U CN202022649307.8U CN202022649307U CN214038382U CN 214038382 U CN214038382 U CN 214038382U CN 202022649307 U CN202022649307 U CN 202022649307U CN 214038382 U CN214038382 U CN 214038382U
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Abstract
The utility model discloses a micro-gas ignition combustion-supporting combustion device, which comprises a pulverized coal combustion device, an air film cooling air device and a plurality of natural gas combustion devices; the pulverized coal combustion device comprises a primary air-powder pipe, a pulverized coal secondary combustion chamber, a pulverized coal tertiary combustion chamber, a pulverized coal precombustion chamber and a pulverized coal primary combustion chamber; the natural gas combustion device comprises a cyclone disk, a combustor shell, a branch gas pipe, a main gas pipe, a gas inlet, a gas air distribution plate, an ignition device and a combustion-supporting air inlet, the device can realize the whole-course operation of the environmental protection equipment in the boiler start-stop and combustion-supporting process, and the fuel cost is greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of coal fired power plant boiler starts ignition, a combustion-supporting burner is igniteed to little gas is related to.
Background
Under the current electric power market conditions, the number of operating hours of each station boiler is greatly reduced compared with the prior art, and the unit needs to be started and stopped frequently and operated at low load for a long time under the condition of flexible operation, so that new requirements for ignition and combustion supporting of the station boiler are provided. The ignition combustion-supporting technology of the mainstream coal-fired boiler can be divided into an oil-saving ignition technology and an oil-free ignition technology at present, wherein the oil-saving ignition technology mainly comprises a little-oil ignition technology and a tiny-oil ignition technology, and the oil-free ignition technology mainly refers to a plasma ignition technology.
The oil gun with less oil is adopted for ignition and combustion supporting, the ignition and combustion supporting oil consumption for starting and stopping a single unit is high, and the fuel cost of a power plant is overlarge. And the problems that oil stains which are not burnt completely pollute the denitration catalyst, the desulfurization slurry and the like in the starting process of the boiler exist, so that the environmental protection equipment cannot be normally put into operation, and great pressure is brought to environmental protection operation indexes of a power plant. The micro-oil ignition burner is adopted for ignition and combustion supporting, the fuel cost is greatly reduced, but the problems of easy burning loss, coking blockage and the like of a burner nozzle exist, anthracite cannot be directly input in a cold starting stage, and the burn-out rate of pulverized coal at the initial stage of combustion is poor. The plasma ignition burner is limited by ignition energy, has poor coal adaptability, and cannot be used for igniting low-volatile coal species such as anthracite, inferior lean coal and the like. And the system is complex, the service life of the cathode is short, and the daily operation and maintenance workload is large.
In recent years, natural gas is gradually applied to coal-fired power station boilers at present due to the advantages of no blockage of a supply system, no oil residue coking at a spray gun port, high stopping speed, good burnout performance and the like. The natural gas direct-ignition combustion-supporting system can be arranged independently of a coal-fired system, natural gas directly enters the furnace in a non-premixed mode to be combusted, generated flame is used for heating a hearth and directly heating and igniting pulverized coal airflow, starting and stopping ignition and low-load combustion supporting of the boiler are achieved, combustion products are clean, downstream environment-friendly equipment is not affected, and the environment-friendly equipment can be put into operation in the whole process. The natural gas ignition combustion-supporting system has simple equipment, less workload of daily operation and maintenance, lower fuel cost than fuel oil, but very large gas consumption, and is generally designed according to 30 percent BMCR output. Nowadays, natural gas resources in China are increasingly tense, and the phenomenon of 'gas shortage' often appears in winter in some provinces and cities, so that an ignition combustion-supporting technology with more energy conservation is needed to meet the ignition combustion-supporting requirement and deal with the 'gas shortage' problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a combustion-supporting burner of little gas ignition, the device can realize that the boiler opens and stops and the whole journey of combustion-supporting in-process environmental protection equipment put into operation, and reduce fuel cost by a wide margin.
In order to achieve the purpose, the micro-gas ignition combustion-supporting combustion device comprises a pulverized coal combustion device, an air film cooling air device and a plurality of natural gas combustion devices; the pulverized coal combustion device comprises a primary air-powder pipe, a pulverized coal secondary combustion chamber, a pulverized coal tertiary combustion chamber, a pulverized coal precombustion chamber and a pulverized coal primary combustion chamber;
the air film cooling air device is provided with an air film cooling air inlet, the tail part of the primary air powder pipe, the coal powder secondary combustion chamber and the coal powder tertiary combustion chamber are all positioned in the air film cooling air device, the coal powder pre-combustion chamber and the coal powder primary combustion chamber are positioned in the primary air powder pipe, the coal powder pre-combustion chamber comprises a first hollow round table and a second hollow round table, the bottom of the first hollow round table is over against the incoming flow direction of the primary air powder pipe 4, the top of the first hollow round table is communicated with the bottom of the second hollow round table, and the outlets of all the natural gas combustion devices are obliquely inserted into the second hollow round table along the axial symmetry; the bottom of the second hollow round table is communicated with the inlet of the primary pulverized coal combustion chamber, the outlet of the primary pulverized coal combustion chamber is connected with the inlet of the secondary pulverized coal combustion chamber, and the outlet of the secondary pulverized coal combustion chamber is communicated with the inlet of the tertiary pulverized coal combustion chamber;
the pulverized coal pre-combustion chamber is of a structure which contracts first and expands later;
the natural gas combustion device comprises a cyclone disc, a burner shell, a branch gas pipe, a main gas pipe, a gas inlet, a gas air distribution plate, an ignition device and a combustion-supporting air inlet;
the spiral-flow disk is located the hollow round platform of second, and the spiral-flow disk is fixed in the top opening part of combustor shell, and the rifle head of branch road gas pipe passes the spiral-flow disk, and combustor shell and spiral-flow disk are passed along the axial in the top of main gas pipe, and the afterbody and the gas import of main gas pipe are linked together, and the top opening part of main gas pipe passes through the gas air distributor and seals, and ignition passes main gas pipe and gas air distributor along the axial, and the combustion-supporting wind import sets up on the spiral-flow disk.
The cooling air channel axially penetrates through the combustor shell and the cyclone disc, the cooling air inlet is communicated with the cooling air channel, and the fire detection device is axially inserted into the cooling air channel.
The first-stage swirl blades are arranged at the connecting position of the second hollow round table and the pulverized coal first-stage combustion chamber.
And a second-stage rotational flow blade is arranged at the connecting position of the first-stage pulverized coal combustion chamber and the second-stage pulverized coal combustion chamber.
The gun head of the branch gas pipe is of a Venturi structure, and the distance between the cyclone disk and the throat of the Venturi structure is 0-100 mm.
The inclination angle of the natural gas combustion device is 15-75 degrees.
The wall surfaces of the pulverized coal pre-combustion chamber, the pulverized coal primary combustion chamber, the pulverized coal secondary combustion chamber and the pulverized coal tertiary combustion chamber are all provided with temperature continuous monitoring elements.
The outlets of the pulverized coal secondary combustion chamber, the pulverized coal tertiary combustion chamber and the air film cooling air device are all of contracted ring structures which are inwards bent by 10-60 degrees.
And the positions of the first-stage swirl blades and the second-stage swirl blades in the upstream direction are provided with an anti-abrasion layer.
The bottom of the burner shell is provided with a fire observation hole.
The utility model discloses following beneficial effect has:
micro-gas ignition combustion-supporting combustion device when concrete operation, the gas is through main gas pipe and branch road gas pipe blowout, combustion-supporting wind is through the whirl dish blowout, realizes the hierarchical homogeneous mixing burning of gas wind. Meanwhile, the gas air distribution plate ensures the stability of combustion-supporting flame, the gas sprayed axially by the branch gas pipe is mixed with the swirling air sprayed by the swirling disc, a main combustion area is formed at the downstream of the throat opening of the combustor, the flame propagation speed of combustible gas mixture is high, the flame temperature is high, the pulverized coal airflow can be directly ignited, and the stable ignition and combustion of the pulverized coal in the pulverized coal pre-combustion chamber are facilitated. The opposed inclined arrangement of the natural gas combustion device is beneficial to mutual support of natural gas flame, strengthens the heat and mass exchange process, provides favorable conditions for ignition and combustion of pulverized coal airflow, enables the burn-off rate of natural gas to be more than 99.99%, has clean combustion products, can not generate extra pressure on subsequent environmental protection equipment, realizes the whole-process operation of the environmental protection equipment in the boiler start-stop and combustion-supporting processes, and greatly reduces the fuel cost.
Furthermore, the pulverized coal pre-combustion chamber structure which is contracted first and then expanded is beneficial to enriching and firing of pulverized coal airflow, and the temperature of pulverized coal particles is sharply increased under the heating of concentrated-phase pulverized coal airflow in the pulverized coal pre-combustion chamber by high-temperature flame sprayed by a natural gas combustion device, so that a large amount of volatile matters are separated out and rapidly fired. The ignited and combusted coal dust airflow in the coal dust pre-combustion chamber enters the coal dust primary combustion chamber, the light-phase coal dust airflow which enters in a rotating mode is mixed, heated and ignited, and then continues to diffuse and ignite the coal dust airflow in the coal dust secondary combustion chamber and the coal dust airflow in the coal dust tertiary combustion chamber forward, so that the gradual combustion of the coal dust airflow is realized, the purpose of ignition and combustion supporting by using coal instead of gas is achieved, the ignition and combustion supporting natural gas amount required by the combustion of the coal dust airflow is greatly reduced when the cold furnace is ignited and started, and the gas saving rate can reach more than 90%. In addition, the gas film cooling air can effectively prevent the pipe wall of the primary, secondary and tertiary combustion chambers of the pulverized coal from overtemperature, and ensure that the pulverized coal burner does not slag or corrode
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of the natural gas combustion device 2 of the present invention;
fig. 3 is a front view of the natural gas burner 2 of the present invention.
Wherein, 1 is a coal powder combustion device, 2 is a natural gas combustion device, 3 is an air film cooling air device, 4 is a primary air powder pipe, 5 is a coal powder precombustion chamber, 6 is a coal powder primary combustion chamber, 7 is a coal powder secondary combustion chamber, 8 is a coal powder tertiary combustion chamber, 9 is a primary rotational flow blade, 10 is a secondary rotational flow blade, 11 is a first hollow round table, 12 is a second hollow round table, 13 is a contraction ring structure, 14 is a gas film cooling air inlet, 2-1 is a main gas pipe, 2-2 is a gas inlet, 2-3 is a branch gas pipe, 2-4 is an ignition device, 2-5 is a fire detection device, 2-6 is a cooling air inlet, 2-7 is a cyclone disc, 2-8 is a burner shell, 2-9 is a combustion-supporting air inlet, 2-10 is a gas air distribution plate, and 2-11 is a fire observation hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, 2 and 3, the micro-gas ignition combustion-supporting combustion device of the present invention includes a pulverized coal combustion device 1, a gas film cooling air device 3 and a plurality of natural gas combustion devices 2; the pulverized coal combustion device 1 comprises a primary air-powder pipe 4, a pulverized coal secondary combustion chamber 7, a pulverized coal tertiary combustion chamber 8, a pulverized coal precombustion chamber 5 and a pulverized coal primary combustion chamber 6; the pulverized coal pre-combustion chamber 5 is of a structure which is contracted and expanded firstly, the pulverized coal pre-combustion chamber 5 comprises a first hollow round table 11 and a second hollow round table 12, the bottom of the first hollow round table 11 is over against the incoming flow direction of the primary air-powder pipe 4, the top of the first hollow round table 11 is communicated with the bottom of the second hollow round table 12, and the outlet shafts of all the natural gas combustion devices 2 are symmetrically and obliquely inserted into the second hollow round table 12; the bottom of the second hollow round table 12 is communicated with the inlet of the primary combustion chamber 6 of the pulverized coal, and a primary swirl blade 9 is arranged at the connecting position of the second hollow round table 12 and the primary combustion chamber 6 of the pulverized coal; the outlet of the primary pulverized coal combustion chamber 6 is connected with the inlet of the secondary pulverized coal combustion chamber 7, and a secondary swirl vane 10 is arranged at the connecting position of the primary pulverized coal combustion chamber 6 and the secondary pulverized coal combustion chamber 7; the outlet of the pulverized coal secondary combustion chamber 7 is communicated with the inlet of the pulverized coal tertiary combustion chamber 8; the tail parts of the coal powder secondary combustion chamber 7, the coal powder tertiary combustion chamber 8 and the primary air-powder pipe 4 are all positioned in the air film cooling air device 3.
The natural gas combustion device 2 comprises a combustor main gas pipe 2-1, a gas inlet 2-2, a branch gas pipe 2-3, an ignition device 2-4, a fire detection device 2-5, a cooling air inlet 2-6, a cyclone disc 2-7, a combustor shell 2-8 and a combustion-supporting air inlet 2-9; the tail of the main gas pipe 2-1 is connected with a gas inlet 2-2, the opening at the top of the main gas pipe 2-1 is sealed by a gas air distribution plate 2-10, an ignition device 2-4 axially penetrates through the main gas pipe 2-1 and the gas air distribution plate 2-10, the gun head of the branch gas pipe 2-3 penetrates through a cyclone disk 2-7, the cyclone disk 2-7 is fixed at the opening at the top of a burner shell 2-8, a cooling air channel is axially inserted into the burner shell 2-8 and the cyclone disk 2-7, a cooling air inlet 2-6 is communicated with the cooling air channel, a fire detection device 2-5 is axially inserted into the cooling air channel, a combustion-supporting air inlet 2-9 is arranged on the cyclone disk 2-7, and the gun head of the branch gas pipe 2-3 penetrates through the cyclone disk 2-7. The gun head of the branch gas pipe 2-3 is lower than the height of the folded plate of the cyclone disk 2-7.
The angles and the number of the first-stage swirl blades 9 and the second-stage swirl blades 10 are variable, and the parts of the first-stage swirl blades 9 and the second-stage swirl blades 10 facing the current direction are provided with an anti-abrasion layer.
The gun head of the branch gas pipe 2-3 is of a Venturi structure, and the distance between the cyclone disk 2-7 and the throat of the Venturi structure is 0-100 mm.
The bottom plate of the natural gas combustion device 2 is also provided with fire observation holes 2-11. The natural gas combustion device 2 is inclined at an angle of 15-75 degrees and is axially and symmetrically arranged on the second hollow circular truncated cone 12, and natural gas flame generated by the natural gas combustion device 2 is injected into the pulverized coal precombustion chamber 5 in a hedging manner to heat pulverized coal airflow.
The wall surfaces of the coal powder pre-combustion chamber 5, the coal powder primary combustion chamber 6, the coal powder secondary combustion chamber 7 and the coal powder tertiary combustion chamber 8 are all provided with temperature continuous monitoring elements.
The side surface of the film cooling air device 3 close to the natural gas combustion device 2 is provided with a film cooling air inlet 14. The outlets of the pulverized coal secondary combustion chamber 7, the pulverized coal tertiary combustion chamber 8 and the air film cooling air device 3 are all of contracted ring structures 13 which are inwards bent by 10-60 degrees, and the bending angles can be freely set.
The utility model discloses during operation, the gas is spout through main gas pipe 2-1 and branch road gas pipe 2-3, and combustion-supporting wind spouts through whirl dish 2-7, realizes the hierarchical homogeneous mixing burning of gas-air. Meanwhile, the stability of combustion-supporting flame is guaranteed through the gas air distribution plates 2-10, gas axially sprayed out of the branch gas pipes 2-3 is mixed with swirling air of the swirling discs 2-7, a main combustion area is formed at the downstream of a throat opening of the combustor, the flame propagation speed of a combustible gas mixture is high, the flame temperature is high, pulverized coal airflow can be directly ignited, and the stable ignition and combustion of pulverized coal in the pulverized coal pre-combustion chamber 5 are facilitated. The opposite-impact inclined arrangement of the natural gas combustion device 2 is beneficial to mutual support of natural gas flames, strengthens the heat and mass exchange process and provides favorable conditions for ignition and combustion of pulverized coal airflow. The structure of the pulverized coal precombustion chamber 5 which is contracted and expanded firstly is beneficial to the enrichment and ignition of pulverized coal airflow, and the temperature of pulverized coal particles is increased sharply under the heating of the dense-phase pulverized coal airflow in the pulverized coal precombustion chamber 5 by high-temperature flame sprayed by the natural gas combustion device 2, so that a large amount of volatile components are separated out and are rapidly ignited and combusted. The ignited and combusted pulverized coal airflow in the pulverized coal precombustion chamber 5 enters the pulverized coal primary combustion chamber 6, the rotationally-entered light-phase pulverized coal airflow is mixed, heated and ignited, and then the pulverized coal airflow in the pulverized coal secondary combustion chamber 7 and the pulverized coal tertiary combustion chamber 8 is continuously diffused and ignited forward, so that the pulverized coal airflow is combusted step by step, the purpose of ignition and combustion supporting by replacing coal with gas is achieved, the ignition and combustion supporting natural gas amount required by the combustion of the pulverized coal airflow is greatly reduced when the cold furnace is ignited and started, and the gas saving rate can reach over 90 percent. The air film cooling air can effectively prevent the pipe walls of the coal powder primary combustion chamber 6, the coal powder secondary combustion chamber 7 and the coal powder tertiary combustion chamber 8 from being over-heated, and ensure that the coal powder combustion device 1 does not slag and ablate. The contraction ring structure 13 is beneficial to stable combustion and diffusion of pulverized coal airflow flame at the outlet of the pulverized coal combustion device 1.
The utility model discloses a combustion-supporting gas and the hierarchical whirl co-combustion of air, high temperature flame offset get into buggy precombustion 5 and meet with the buggy air current, reach the heating and ignite the buggy air current and make the energy enlarge step by step, finally realize the combustion-supporting purpose of igniteing. When concrete operation, the utility model discloses a coal fired power plant boiler cold state ignition starts and the low-load is surely burnt the time provides an economical and feasible energy-conserving transformation technical route, can realize that the boiler opens and stops and the whole operation of combustion-supporting in-process environmental protection equipment, and reduces fuel cost by a wide margin. The device has wide coal type adaptability, is suitable for cold ignition starting of lignite, bituminous coal, lean coal, anthracite and the like, has no special requirement on primary air-powder concentration, can adjust the primary air-powder concentration according to the temperature and pressure rise requirement of a boiler, and has low energy consumption of the system.
Finally, it is noted that the coal has wide adaptability and is suitable for cold ignition starting of lignite, bituminous coal, lean coal, anthracite and the like. The primary air-powder concentration has no special requirement, and can be adjusted according to the requirements of temperature rise and pressure rise of the boiler. The system has low energy consumption.
Claims (10)
1. A micro-gas ignition combustion-supporting combustion device is characterized by comprising a pulverized coal combustion device (1), an air film cooling air device (3) and a plurality of natural gas combustion devices (2); the pulverized coal combustion device (1) comprises a primary air-powder pipe (4), a pulverized coal secondary combustion chamber (7), a pulverized coal tertiary combustion chamber (8), a pulverized coal precombustion chamber (5) and a pulverized coal primary combustion chamber (6);
an air film cooling air inlet (14) is formed in the air film cooling air device (3), the tail part of the primary air powder pipe (4), the coal powder secondary combustion chamber (7) and the coal powder tertiary combustion chamber (8) are all located in the air film cooling air device (3), the coal powder pre-combustion chamber (5) and the coal powder primary combustion chamber (6) are located in the primary air powder pipe (4), the coal powder pre-combustion chamber (5) comprises a first hollow circular truncated cone (11) and a second hollow circular truncated cone (12), the bottom of the first hollow circular truncated cone (11) is over against the incoming flow direction of the primary air powder pipe (4), the top of the first hollow circular truncated cone (11) is communicated with the bottom of the second hollow circular truncated cone (12), and outlets of the natural gas combustion devices (2) are obliquely inserted into the second hollow circular truncated cone (12) along an axial symmetry; the bottom of the second hollow round table (12) is communicated with the inlet of the primary pulverized coal combustion chamber (6), the outlet of the primary pulverized coal combustion chamber (6) is connected with the inlet of the secondary pulverized coal combustion chamber (7), and the outlet of the secondary pulverized coal combustion chamber (7) is communicated with the inlet of the tertiary pulverized coal combustion chamber (8);
the pulverized coal pre-combustion chamber (5) is of a structure which contracts first and expands later;
the natural gas combustion device (2) comprises a cyclone disc (2-7), a combustor shell (2-8), a branch gas pipe (2-3), a main gas pipe (2-1), a gas inlet (2-2), a gas air distribution plate (2-10), an ignition device (2-4) and a combustion-supporting air inlet (2-9);
the cyclone disk (2-7) is located on the second hollow circular truncated cone (12), the cyclone disk (2-7) is fixed at the opening of the top of the combustor shell (2-8), the gun head of the branch gas pipe (2-3) penetrates through the cyclone disk (2-7), the top of the main gas pipe (2-1) axially penetrates through the combustor shell (2-8) and the cyclone disk (2-7), the tail of the main gas pipe (2-1) is communicated with the gas inlet (2-2), the opening of the top of the main gas pipe (2-1) is sealed through the gas air distribution plate (2-10), the ignition device (2-4) axially penetrates through the main gas pipe (2-1) and the gas air distribution plate (2-10), and the combustion-supporting air inlet (2-9) is arranged on the cyclone disk (2-7).
2. The micro-gas ignition combustion-supporting combustion device as claimed in claim 1, further comprising a cooling air inlet (2-6), a cooling air channel and a fire detection device (2-5), wherein the cooling air channel axially penetrates through the combustor casing (2-8) and the cyclone disc (2-7), the cooling air inlet (2-6) is communicated with the cooling air channel, and the fire detection device (2-5) is axially inserted into the cooling air channel.
3. The micro-gas ignition combustion-supporting combustion device as claimed in claim 1, wherein the first-stage swirl vanes (9) are arranged at the connecting position of the second hollow circular truncated cone (12) and the first-stage pulverized coal combustion chamber (6).
4. The micro-gas ignition combustion-supporting combustion device as claimed in claim 3, wherein a secondary swirl vane (10) is arranged at the connection position of the primary pulverized coal combustion chamber (6) and the secondary pulverized coal combustion chamber (7).
5. Micro-gas ignition combustion-supporting combustion device according to claim 1, characterized in that the tip of the branch gas pipe (2-3) is of a venturi structure, and the distance between the swirl disk (2-7) and the throat of the venturi structure is 0-100 mm.
6. Micro gas ignition combustion-supporting burner according to claim 1, characterized in that the natural gas burner (2) is inclined at an angle of 15 ° to 75 °.
7. The micro-gas ignition combustion-supporting combustion device as claimed in claim 1, wherein the wall surfaces of the pulverized coal pre-combustion chamber (5), the pulverized coal primary combustion chamber (6), the pulverized coal secondary combustion chamber (7) and the pulverized coal tertiary combustion chamber (8) are all provided with temperature continuous monitoring elements.
8. The micro-gas ignition combustion-supporting combustion device as claimed in claim 1, wherein outlets of the pulverized coal secondary combustion chamber (7), the pulverized coal tertiary combustion chamber (8) and the air film cooling air device (3) are all of a contracted ring structure (13) which is bent inwards by 10-60 degrees.
9. The micro-gas ignition combustion-supporting combustion device as claimed in claim 4, wherein the parts facing the inflow direction on the first-stage swirl blades (9) and the second-stage swirl blades (10) are provided with an anti-abrasion layer.
10. Micro-gas ignition combustion-supporting combustion device according to claim 1, characterized in that the bottom of the burner housing (2-8) is provided with fire observation holes (2-11).
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| CN202022649307.8U CN214038382U (en) | 2020-11-16 | 2020-11-16 | Micro-gas ignition combustion-supporting combustion device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11840988B1 (en) | 2023-03-03 | 2023-12-12 | Venus Aerospace Corp. | Film cooling with rotating detonation engine to secondary combustion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11840988B1 (en) | 2023-03-03 | 2023-12-12 | Venus Aerospace Corp. | Film cooling with rotating detonation engine to secondary combustion |
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