CN114321977A - Intelligent adjustment system and method for air inlet area of circular seam cap cover - Google Patents
Intelligent adjustment system and method for air inlet area of circular seam cap cover Download PDFInfo
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- CN114321977A CN114321977A CN202111430106.1A CN202111430106A CN114321977A CN 114321977 A CN114321977 A CN 114321977A CN 202111430106 A CN202111430106 A CN 202111430106A CN 114321977 A CN114321977 A CN 114321977A
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- air
- outer ring
- cap cover
- wall surface
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 64
- 239000000446 fuel Substances 0.000 claims abstract description 29
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 6
- 231100000719 pollutant Toxicity 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
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Abstract
The invention discloses an intelligent adjusting system and an intelligent adjusting method for the air inlet area of a circular seam cap cover, and belongs to the field of combustion of gas turbines. The invention arranges a plurality of air baffles contacted with the inner/outer ring airflow on the wall surface contacted with the inner/outer ring airflow of the circular seam cap cover; when the working condition changes, the control terminal calculates the fuel flow required by the current working condition according to the inlet pressure, calculates the movement amount of the air baffle plate along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover required by the current working condition by utilizing the corresponding relation between the fuel regulation rule calibrated in advance and the radial movement amount of the air baffle plate along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, converts the movement amount into a regulation signal of a hydraulic system, controls the movement of the air baffle plate along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover by utilizing the extension and retraction of the corresponding telescopic supporting rod according to a hydraulic principle, changes the air inlet area of the circular seam cap cover, changes the air quantity entering a flame tube through a swirler, intelligently adjusts the oil-gas ratio of a main combustion area, widens the flameout boundary, improves the combustion efficiency and reduces the pollutant emission.
Description
Technical Field
The invention belongs to the field of combustion of gas turbines, and relates to an intelligent adjustment system and an intelligent adjustment method for the air inlet area of a circular seam cap cover.
Background
The development of the gas turbine technology has more and more strict requirements on the aspects of combustion performance, pollutant discharge amount, flameout boundary and the like, and the continuous development of the intelligent combustion regulation and control technology provides a new development direction for the gas turbine combustor.
For a gas turbine combustor, the fuel supply varies with operating conditions. In a small state, the required fuel supply is small; when the gas turbine requires increased thrust or power, the amount of fuel supply required increases. In a common gas turbine combustor, the geometrical structures of a cap, a flame tube and the like are fixed, and the geometrical structures determine the air flow distribution ratio under each working condition, so that the air quantity entering a main combustion area of the flame tube through the cap and a swirler under each working condition is basically kept unchanged. Therefore, along with the change of the working condition of the engine, the gas-oil ratio of the main combustion area of the flame tube can generate lean oil or rich oil with different degrees, and the gas-oil ratio has great influence on combustion stability, combustion efficiency, pollutant discharge amount and the like.
Disclosure of Invention
Aiming at the defect that the oil-gas ratio of a main combustion area is in a lean or rich state due to the change of the fuel supply amount of the gas turbine combustion chamber under different working conditions, the invention provides the intelligent adjustment system and the intelligent adjustment method for the air inlet area of the circumferential seam cap cover.
The invention is realized by the following steps:
an intelligent adjusting system and an intelligent adjusting method for the air inlet area of a circular seam cap cover comprise a combustion chamber casing, wherein a flame tube is arranged in the combustion chamber casing, and the flame tube is sequentially provided with the circular seam cap cover and a swirler along the incoming flow direction; the circular seam hood is provided with a plurality of air baffles contacted with the outer ring airflow on the wall surface contacted with the outer ring airflow, and is provided with a plurality of air baffles contacted with the inner ring airflow on the wall surface contacted with the inner ring airflow; in order to realize the radial movement of the air baffles along the inner and outer ring wall surfaces of the circular seam cap cover, the air baffles can not be completely connected into a complete circular ring, but a block circumferential arrangement mode is adopted, and the adjacent air baffles can not be contacted with each other in the whole movement range. All the air baffles in contact with the inner ring airflow are connected to the same inner ring hydraulic main road, and in the same way, all the air baffles in contact with the outer ring airflow are connected to the same outer ring hydraulic main road, so that all the air baffles in contact with the outer ring airflow synchronously move along the wall surface of the cap cover, and all the air baffles in contact with the inner ring airflow synchronously move along the wall surface of the cap cover, thereby ensuring the uniformity of the circumferential air flow of the circular seam cap cover.
The air baffle plate contacted with the outer ring airflow penetrates through the wall surface of an outer ring channel of the combustion chamber casing by utilizing the first telescopic support rod and is connected with the outer ring hydraulic main circuit; the air baffle plate contacted with the inner ring airflow penetrates through the wall surface of the inner ring channel of the combustion chamber casing by using a second telescopic support rod and is connected with the inner ring hydraulic main path; the air baffle is controlled to move along the radial direction of the inner ring wall surface and the outer ring wall surface of the circular seam cap cover through the expansion of the telescopic supporting rods.
The radial movement of the air baffle along the inner and outer ring wall surfaces of the circular seam cap cover can change the air inlet area of the circular seam cap cover, thereby changing the air quantity entering the flame tube through the swirler and achieving the purpose of adjusting the oil-gas ratio of the main combustion area of the flame tube. The air baffle plate contacted with the outer ring airflow and the air baffle plate contacted with the inner ring airflow move along the radial direction of the inner ring wall surface and the outer ring wall surface of the circular seam cap cover respectively and are controlled by controlling the expansion of the first telescopic supporting rod and the second telescopic supporting rod through a hydraulic system.
The invention also discloses an intelligent adjustment method for the air inlet area of the circular seam cap cover, which comprises the following steps:
the method comprises the steps of firstly marking the ratio of the air quantity entering a flame tube main combustion area through a swirler, which is required by the inlet pressure of a combustion chamber and the fuel flow under all working conditions, calculating the radial movement of an air baffle plate along the inner and outer ring wall surfaces of a circular seam cap cover under all working conditions, and establishing a set of control algorithm of the inlet pressure of the combustion chamber, the fuel flow and the movement of the air baffle plate at a control terminal.
Under the standard working condition, the air baffle plate contacted with the outer ring airflow and the air baffle plate contacted with the inner ring airflow both move to proper positions along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, so that the gas-oil ratio of the main combustion area of the flame tube is in a designed state.
When the thrust or power needs to be increased, the fuel supply is increased, the control terminal calculates the fuel flow of the current working condition according to the total inlet pressure of the current combustion chamber, then determines the flow area required by the air flow when the air flow passes through the circular seam cap cover according to the corresponding relation of the ratio of the calibrated inlet pressure, the fuel flow and the air volume entering the main combustion area of the flame tube through the swirler, finally calculates the radial movement amount of the air baffle plate required under the current working condition along the inner and outer ring wall surfaces of the circular seam cap cover, converts the radial movement amount into an adjusting signal of a hydraulic system, controls the first telescopic supporting rod and the second telescopic supporting rod to be shortened, enables the air baffle plate contacted with the outer ring air flow and the air baffle plate contacted with the inner ring air flow to move a certain distance along the back of the inner and outer ring wall surfaces of the circular seam cap cover, and gradually increases the air volume entering the flame tube through the swirler, the oil-gas ratio of the main combustion area of the flame tube is adjusted, and the effect of intelligently controlling the combustion of the flame tube in the combustion chamber under the designed oil-gas ratio according to the total pressure and the fuel flow of the inlet of the combustion chamber is achieved.
In the same way, when the engine works under the condition of changing to a small working condition, the fuel supply amount is reduced, the control terminal calculates the fuel flow rate of the current working condition according to the total inlet pressure of the current combustion chamber, then determines the required air amount ratio entering the flame tube through the swirler according to the fuel flow rate, thereby determining the circulation area required by the air flow when the air flow passes through the circular seam cap cover, finally calculating the radial movement amount of the air baffle plate required under the current working condition along the inner and outer ring wall surfaces of the circular seam cap cover, and converts the signal into an adjusting signal of a hydraulic system to control the first telescopic supporting rod and the second telescopic supporting rod to extend so that the air baffle plate contacted with the outer ring airflow and the air baffle plate contacted with the inner ring airflow move a certain distance oppositely along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, thereby reduce the flow area when the air current flows through the circumferential weld cap gradually, reduce the air quantity that gets into the flame tube through the swirler, the oil-gas ratio in the main combustion zone of intelligent regulation flame tube.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the intelligent adjusting system for the air inlet area of the circular seam cap cover, the air inlet area of the circular seam cap cover is adjusted through the radial movement of the air baffle plate along the inner and outer ring wall surfaces of the circular seam cap cover, so that the air quantity entering a flame tube through a swirler in a combustion chamber is intelligently adjusted, the oil-gas ratio of a main combustion area of the flame tube in the combustion chamber is ensured to be in a design state under various working conditions, and the combustion efficiency and the combustion stability of the flame tube in the combustion chamber under variable working conditions are improved; when the working condition of the combustion chamber is gradually increased from a small working condition to a maximum working condition, the fuel supply quantity is gradually increased, in order to ensure that the fuel-air ratio at the head of the flame tube of the combustion chamber is basically kept unchanged, the air quantity entering the flame tube through the swirler needs to be gradually increased, and therefore, the flow area of the airflow flowing through the circular seam cap cover is gradually increased by controlling the radial movement of the air baffle plate. By the intelligent adjusting method, the ignition and flameout boundaries of the combustion chamber can be widened, the combustion efficiency is improved, and the pollutant emission is reduced.
2) When the thrust or power of the gas turbine is increased, the fuel flow of a combustion chamber needs to be increased, the air inlet area of the circular seam cap cover is increased by controlling the radial movement of the air baffle plate, the air quantity entering the main combustion area of the flame tube through the swirler is gradually increased, and the gas passes through the swirler, so that the head oil gas atomization effect under large working conditions is more effectively enhanced, and the combustion performance is further improved.
Drawings
FIG. 1 is a state of the intelligent adjustment system for the air intake area of the circular seam cap of the invention under a standard working condition;
FIG. 2 is a state of the intelligent adjustment system for the air intake area of the circular seam bonnet in a large working condition;
FIG. 3 is a state of the intelligent adjustment system for the air intake area of the circular seam bonnet in a small condition;
FIG. 4 is a schematic view of the circumferential arrangement of the air baffle of the intelligent adjustment system for the air intake area of the circumferential sewing bonnet of the present invention;
FIG. 5 is a schematic diagram of an intelligent control system of the intelligent adjustment system for the air intake area of the circular seam cap.
The device comprises a diffuser 1, a first telescopic strut 2, an outer ring hydraulic main path 3, an air baffle plate contacting with outer ring airflow 4, a circular seam cap cover 5, a combustion chamber casing 6, a flame tube 7, a swirler 8, an air baffle plate contacting with inner ring airflow 9, an inner ring hydraulic main path 10 and a second telescopic strut 11.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clear, the present invention is further described in detail by the following examples. It should be noted that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 3, the system of the present invention includes a diffuser 1 and a combustion chamber casing 6, wherein a flame tube 7 is disposed inside the combustion chamber casing 6, and a circular seam cap 5 and a swirler 8 are disposed on the flame tube 7 along an incoming flow direction; the circular seam cap cover 5 is respectively provided with an air baffle 4 which is attached to the wall surface in contact with the outer ring airflow and an air baffle 9 which is in contact with the inner ring airflow, wherein the wall surface is in contact with the outer ring airflow; the air baffle plate contacted with the outer ring airflow penetrates through the wall surface of an outer ring channel of a combustion chamber casing 6 by using a first telescopic support rod 2 and is connected with an outer ring hydraulic main path 3; the air baffle plate contacted with the inner ring airflow passes through the wall surface of the inner ring channel of the combustion chamber casing 6 by using a second telescopic support rod 11 and is connected with an inner ring channel hydraulic main line 10.
The air baffles 4 in contact with the outer ring airflow are connected to the same outer ring hydraulic main circuit 3, and the air baffles 9 in contact with the inner ring airflow are connected to the same inner ring hydraulic main circuit 10; the radial movement of the air baffle along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover is controlled by the extension of the first telescopic supporting rod 2 and the second telescopic supporting rod 11 respectively.
As shown in figure 1, which is a state schematic diagram of the intelligent adjustment system for the air inlet area of the circular seam cap cover under the standard working condition, an air baffle plate 4 in contact with outer ring airflow and an air baffle plate 9 in contact with inner ring airflow both move to proper positions along the inner and outer ring wall surfaces of the circular seam cap cover, so that the oil-gas ratio of a main combustion area of a flame tube of a combustion chamber is ensured to be in a design state.
When thrust or power needs to be increased, the fuel supply amount is increased, the movement amount of the air baffle required under the current working condition is calculated in the control terminal according to the corresponding relation among the inlet total pressure, the fuel flow and the movement amount of the air baffle along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, the movement amount is converted into an adjusting signal of a hydraulic system, and the first telescopic supporting rod and the second telescopic supporting rod are driven to be shortened by utilizing hydraulic energy, so that the air baffle 4 in contact with the outer ring airflow and the air baffle 9 in contact with the inner ring airflow move backwards along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, and the air inlet area of the circular seam cap cover is increased, as shown in fig. 2.
Similarly, in a small working condition, the fuel supply amount is reduced, the movement amount of the air baffle required under the current working condition is calculated at the control terminal according to the corresponding relation among the inlet total pressure, the fuel flow and the movement amount of the air baffle along the inner and outer ring wall surfaces of the circular seam cap cover, and is converted into an adjusting signal of a hydraulic system, and the first telescopic supporting rod 2 and the second telescopic supporting rod 11 are pushed to extend by using hydraulic energy, so that the air baffle 4 in contact with the outer ring airflow and the air baffle 9 in contact with the inner ring airflow move oppositely along the inner and outer ring wall surfaces of the circular seam cap cover, and the air inlet area of the circular seam cap cover is reduced, as shown in fig. 3.
As shown in fig. 4, all the first telescopic struts 2 are connected with the outer ring hydraulic main circuit 3, and all the second telescopic struts 12 are connected with the inner ring hydraulic main circuit 10, so that all the air baffles 4 in contact with the outer ring airflow move synchronously, and all the air baffles 9 in contact with the inner ring airflow move synchronously, thereby ensuring the uniformity of circumferential air intake of the circular seam bonnet.
As can be seen from figures 1-3, after the air baffle moves along the inner and outer ring wall surfaces of the circular seam cap cover, the air inlet area of the circular seam cap cover is changed, so that the ratio of the flow area of the inner and outer ring channels to the flow area of the head of the combustion chamber is changed, the air quantity entering the flame tube through the cyclone is changed, and the purpose of controlling the oil-gas ratio of the main combustion area of the flame tube by adjusting the air inlet ratio of the circular seam cap cover is achieved.
As shown in fig. 5, the working process of the present invention is:
the air compressed by the compressor under each working condition is divided into three paths after passing through the diffuser: one part enters the outer ring channel, the other part passes through the inner ring channel, and the rest part enters the main combustion area of the flame tube through the annular seam cap and the swirler. When thrust or power needs to be increased, the fuel supply amount is increased, the movement amount of the air baffle required under the current working condition is calculated in the control terminal according to a corresponding system of inlet total pressure, fuel flow and radial movement amount of the air baffle along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, the movement amount is converted into an adjusting signal of a hydraulic system, and the first telescopic supporting rod and the second telescopic supporting rod are driven to be shortened by utilizing hydraulic energy, so that the air baffle in contact with inner ring airflow and the air baffle in contact with outer ring airflow move backwards along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, and the air inlet area of the cap cover is increased; similarly, in a small working condition, the fuel supply amount is reduced, the movement amount of the air baffle required under the current working condition is calculated at the control terminal according to the corresponding relation among the inlet total pressure, the fuel flow and the radial movement amount of the air baffle along the inner and outer ring wall surfaces of the circular seam cap cover, the movement amount is converted into an adjusting signal of a hydraulic system, and the first telescopic supporting rod and the second telescopic supporting rod are pushed to extend by utilizing hydraulic energy, so that the air baffle in contact with the outer ring airflow and the air baffle in contact with the inner ring airflow move oppositely along the inner and outer ring wall surfaces of the circular seam cap cover, and the air inlet area of the circular seam cap cover is reduced; finally, the air quantity entering the head of the flame tube through the swirler is changed, so that the oil-gas ratio of the main combustion area of the combustion chamber under different working conditions is accurately controlled, the stable combustion boundary is widened, the combustion efficiency is improved, and the pollutant emission is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (2)
1. An intelligent adjustment system and method for an air inlet area of a circular seam cap cover comprise a combustion chamber casing (6), and are characterized in that a flame tube (7) is arranged inside the combustion chamber casing (6), and the flame tube (7) is sequentially provided with a circular seam cap cover (5) and a swirler (8) along an incoming flow direction; the circular seam cap cover (5) is provided with a plurality of air baffles (4) contacted with the outer ring airflow on the wall surface contacted with the outer ring airflow, and the circular seam cap cover (5) is provided with a plurality of air baffles (9) contacted with the inner ring airflow on the wall surface contacted with the inner ring airflow;
the air baffle (4) contacted with the outer ring airflow and the air baffle (9) contacted with the inner ring airflow move along the radial direction of the inner ring wall surface and the outer ring wall surface of the circular seam cap cover (5) to change the air inlet area of the circular seam cap cover, thereby changing the air quantity entering the flame tube through the swirler and adjusting the oil-gas ratio of the main combustion area of the flame tube;
the air baffle (4) penetrates through the wall surface of an outer ring channel of a combustion chamber casing (6) by using a first telescopic support rod (2) and is connected with an outer ring hydraulic main line (3); the air baffle (9) penetrates through the wall surface of an inner ring channel of the combustion chamber casing (6) by using a second telescopic support rod (11) and is connected with an inner ring hydraulic main path (10); the air baffles (4) in contact with the outer ring airflow are connected into the same outer ring hydraulic main circuit (3), and the air baffles (9) in contact with the inner ring airflow are connected into the same inner ring hydraulic main circuit (10);
the system regulation method specifically comprises the following steps:
the air compressed by the compressor is divided into three paths after passing through the diffuser: one part enters an outer ring channel, the other part enters an inner ring channel, and the rest part enters a flame tube (7) through a swirler (8) through a circular seam cap cover (5); when thrust or power needs to be increased, the fuel supply amount is increased, the fuel supply amount required under the current working condition is calculated in the control terminal, the air quantity ratio of the air entering the head of the flame tube (7) through the annular seam cap cover (5) and the swirler (8) is calculated, the moving amounts of the air baffle (4) in contact with the outer ring airflow and the air baffle (9) in contact with the inner ring airflow are determined and converted into an adjusting signal of a hydraulic system, and the first telescopic strut (2) and the second telescopic strut (11) are driven to be shortened by hydraulic energy, so that the air baffle (4) in contact with the outer ring airflow and the air baffle (9) in contact with the inner ring airflow move backwards along the inner ring wall surface and the outer ring wall surface of the annular seam cap cover, and the air inlet area of a gap of the cap cover is increased; similarly, when the working condition is small, the fuel supply amount is reduced, according to the corresponding relation among the inlet total pressure, the fuel flow, the air baffle (4) in contact with the outer ring airflow and the radial movement amount of the air baffle (9) in contact with the inner ring airflow along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, the movement amounts of the air baffle (4) in contact with the outer ring airflow and the air baffle (9) in contact with the inner ring airflow, which are needed under the current working condition, are calculated at the control terminal and are converted into the adjusting signal of a hydraulic system, the first telescopic supporting rod (2) and the second telescopic supporting rod (11) are pushed to extend by using hydraulic energy, so that the air baffle (4) in contact with the outer ring airflow and the air baffle (9) in contact with the inner ring airflow move oppositely along the inner ring wall surface and the outer ring wall surface of the circular seam cap cover, and the air inlet area of the circular seam cap cover (5) is reduced; through the area of admitting air of cap gap under the control each operating mode, finally change the air quantity that gets into the flame tube head through the swirler to the oil-gas ratio of accurate control combustion chamber head under different operating modes reaches and widens the stable combustion boundary, improves combustion efficiency, reduces the purpose that the pollutant discharged.
2. The intelligent adjustment system and the adjustment method for the air inlet area of the circular seam bonnet as claimed in claim 1, wherein the air baffle (4) in contact with the outer annular airflow and the air baffle (9) in contact with the inner annular airflow move along the radial direction of the inner and outer annular walls of the circular seam bonnet and are controlled by controlling the expansion of the first telescopic strut (2) and the second telescopic strut (11) through a hydraulic system respectively; all the air baffles (4) contacted with the outer ring airflow and the air baffles (9) contacted with the inner ring airflow are not connected into a complete circular ring, but are arranged in a block circumferential direction, and adjacent air baffles are not contacted with each other in the whole moving range; all the air baffles (4) contacted with the outer ring airflow are connected to the same outer ring hydraulic main road, and in the same way, all the air baffles (9) contacted with the inner ring airflow are connected to the same inner ring hydraulic main road, so that all the air baffles contacted with the outer ring airflow synchronously move along the wall surface of the cap cover, and all the air baffles contacted with the inner ring airflow synchronously move along the wall surface of the cap cover, thereby ensuring the uniformity of the circumferential air flow of the circular seam cap cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111430106.1A CN114321977A (en) | 2021-11-29 | 2021-11-29 | Intelligent adjustment system and method for air inlet area of circular seam cap cover |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111430106.1A CN114321977A (en) | 2021-11-29 | 2021-11-29 | Intelligent adjustment system and method for air inlet area of circular seam cap cover |
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| CN114321977A true CN114321977A (en) | 2022-04-12 |
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| CN202111430106.1A Pending CN114321977A (en) | 2021-11-29 | 2021-11-29 | Intelligent adjustment system and method for air inlet area of circular seam cap cover |
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| CN111486478A (en) * | 2020-04-08 | 2020-08-04 | 南京航空航天大学 | Intelligent adjusting system for air flow distribution of main combustion hole and working method thereof |
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2021
- 2021-11-29 CN CN202111430106.1A patent/CN114321977A/en active Pending
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| CN1673620A (en) * | 2004-03-24 | 2005-09-28 | 巴布考克日立株式会社 | Burner, fuel combustion method and boiler retrofit method |
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Application publication date: 20220412 |