CN211176890U - Combustion chamber of gas turbine capable of adjusting primary air and secondary air - Google Patents
Combustion chamber of gas turbine capable of adjusting primary air and secondary air Download PDFInfo
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- CN211176890U CN211176890U CN201921860921.XU CN201921860921U CN211176890U CN 211176890 U CN211176890 U CN 211176890U CN 201921860921 U CN201921860921 U CN 201921860921U CN 211176890 U CN211176890 U CN 211176890U
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Abstract
The utility model discloses a combustion chamber of a gas turbine capable of adjusting primary air and secondary air, which mainly comprises a gas compressor, a turbine, a combustion chamber and an air quantity adjusting device, wherein the combustion chamber comprises a combustion chamber inner wall, a combustion chamber outer wall and a combustor arranged at the top of the combustion chamber inner wall; the combustor inner wall with be equipped with the space between the combustor outer wall and form air passage, be equipped with the secondary air port on the lateral wall of combustor inner wall, the secondary air port top with be equipped with air regulation device between the combustor inner wall top, just air regulation device install the combustor inner wall with in the air passage between the combustor outer wall. The utility model has the advantages of, the utility model discloses can be according to ambient temperature's change, the proportion of adjustment entering combustion chamber's primary air, overgrate air to improve the stability of gas turbine combustion chamber burning.
Description
Technical Field
The utility model relates to a gas turbine technical field, concretely relates to gas turbine's of adjustable primary air and overgrate air combustion chamber.
Background
When the environmental temperature of a gas turbine system of a power station is low in winter, the flame combustion in a combustion chamber is unstable, and the frequent occurrence of an alarm signal with the duration of more than 0.4s and the pressure fluctuation of more than 80mbar detected by an inner path buzzing monitoring system of the combustion chamber is mainly shown. The environment temperature and the buzzing signal have consistent correlation, and the buzzing disappears when the environment temperature is higher; the lower the ambient temperature, the more frequent the beeps. Frequent buzzer alarming can not only lead to the working condition that the fuel is switched back to the fuel oil after passing the fuel or the trip event, but also possibly cause accidents such as cracks of the heat insulation tile of the combustion chamber and the like.
Two main reasons influencing the combustion stability operation of a combustion chamber of a gas turbine are obtained through theoretical calculation and analysis, on one hand, the air density is improved due to the reduction of the ambient temperature in winter, and the mass flow of the air at the inlet of the combustion chamber is increased under the condition that the angle of an inlet guide vane of a gas compressor is not changed; on the other hand, the ambient temperature is reduced in winter, which also results in a reduction in the combustor inlet air temperature.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, provide an adjustable gas turbine's of once wind and overgrate air combustion chamber, its proportion through the once wind of adjustment combustion chamber, overgrate air to adaptation temperature variation influences the combustion stability of combustion chamber.
In order to achieve the above purpose, the utility model provides a following technical scheme:
The combustion chamber of the gas turbine capable of adjusting the primary air and the secondary air comprises a gas compressor, a turbine, a combustion chamber and an air quantity adjusting device, wherein the combustion chamber comprises a combustion chamber inner wall, a combustion chamber outer wall and a combustor arranged at the top of the combustion chamber inner wall; the combustor inner wall with be equipped with the space between the combustor outer wall and form air passage, be equipped with the secondary air port on the lateral wall of combustor inner wall, the secondary air port top with be equipped with air regulation device between the combustor inner wall top, just air regulation device install in the combustor inner wall with in the air passage between the combustor outer wall, air regulation device is used for controlling air passage's air capacity.
Further, the air compressor is connected with the inner wall of the combustion chamber and an air channel between the outer walls of the combustion chamber; the turbine is connected with the bottom of the combustion chamber; the turbine is connected with the air compressor, and one end of the air compressor is connected with the generator.
Further, an air inlet is formed in the air compressor, and a waste gas outlet is formed in the turbine.
Furthermore, the air volume adjusting device comprises a baffle bearing, baffle blades and a driving ring, the baffle bearing is mounted on the inner wall of the combustion chamber, and the driving ring is used for driving the baffle blades to rotate by taking the baffle bearing as a circle center.
Further, the outer wall of the combustion chamber is attached to the baffle plate blade.
When the environment temperature is reduced and primary air volume needs to be reduced, the baffle blades are driven to rotate by rotating the driving ring by taking the baffle bearing as a circle center, so that an included angle theta between each baffle blade and the cross section of the combustion chamber is controlled to be reduced, the angle of an air flow channel formed between every two adjacent baffle blades deflects along with the reduction of the included angle theta, and the cross section area of the air flow channel is reduced; when the ambient temperature increases and primary air quantity needs to be increased, the driving ring is rotated to drive the baffle blades to rotate by taking the baffle bearing as a circle center, the included angle theta between the baffle blades and the cross section of the combustion chamber is controlled to increase, along with the increase of the included angle theta, the angle of an air flow channel formed between every two adjacent baffle blades deflects, and the cross section area of the air flow channel increases.
Further, the functional relationship between the included angle theta between the baffle plate blade and the cross section of the combustion chamber and the ambient temperature T is as follows:
wherein D is the diameter of the combustion chamber, L is the length of the baffle blades, n is the number of the baffle blades, and T is maxAt the maximum ambient temperature, T minIs the lowest ambient temperature.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
The utility model provides a combustion chamber of a gas turbine capable of adjusting primary air and secondary air, which controls the air input proportion of the primary air and the secondary air through baffle blades annularly arranged in an air channel between the inner wall of the combustion chamber and the outer wall of the combustion chamber, thereby adapting to the problem of insufficient combustion of the combustion chamber caused by the change of the environmental temperature, namely, in the initial state, the baffle plate blades are arranged parallel to the axis of the combustion chamber to meet the air inflow of primary air under the normal condition, when the ambient temperature is reduced and primary air volume needs to be reduced, the driving ring is rotated to drive the baffle blades to rotate by taking the baffle bearing as a circle center, so that the included angle theta between the baffle blades and the cross section of the combustion chamber is controlled to be reduced, the angle of an air flow channel formed between every two adjacent baffle blades is deflected along with the reduction of the included angle theta, and the cross section area of the air flow channel is reduced; satisfy the air input of secondary tuyere, when ambient temperature increases, when the amount of wind of needs increase, through rotating the drive ring, drive baffle blade uses baffle bearing as the centre of a circle rotatory, and the contained angle theta between control baffle blade and the combustion chamber cross section increases, along with the increase of contained angle theta, the angle that forms airflow channel between two adjacent baffle blades takes place to deflect, and airflow channel's cross-sectional area increases, satisfies the air input of primary tuyere. Therefore, the problem that the combustion of the combustion chamber of the traditional gas turbine is unstable due to the change of the ambient temperature is solved, the proportion of primary air and secondary air of the combustion chamber can be adjusted by adjusting the angle theta of the blades of the baffle plate according to the change of the ambient temperature, and the combustion stability of the gas turbine is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the operating principle of the baffle blade;
Fig. 3 is a schematic structural view of a baffle blade according to an embodiment of the present invention.
In the drawings: the device comprises a compressor 1, a turbine 2, a generator 3, a combustion chamber 4, a combustion chamber inner wall 5, a combustion chamber outer wall 6, a combustor 7, a driving ring 8, a baffle bearing 9, baffle blades 10, a secondary air port 11, fuel 12, an air inlet 13 and a waste gas outlet 14.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The combustion chamber of the gas turbine capable of adjusting the primary air and the secondary air as shown in fig. 1 comprises a compressor 1, a turbine 2, a combustion chamber 4 and an air quantity adjusting device, wherein the combustion chamber 4 comprises a combustion chamber inner wall 5, a combustion chamber outer wall 6 and a combustor 7 arranged at the top of the combustion chamber inner wall 5; the combustor inner wall 5 with be equipped with the space between the combustor outer wall 6 and form air passage, be equipped with secondary air port 11 on the lateral wall of combustor inner wall 5, secondary air port 11 top with be equipped with air regulation device between the 5 tops of combustor inner wall, just air regulation device install in combustor inner wall 5 with in the air passage between the combustor outer wall 6, air regulation device is used for controlling air passage's air capacity.
Further, the air volume adjusting device is positioned in an air channel between the inner wall 5 of the combustion chamber and the outer wall 6 of the combustion chamber, and is positioned between the secondary air port 11 and the combustor 7, and mainly comprises baffle blades 10, a baffle bearing 9 and a driving ring 8, wherein the baffle bearing 9 is arranged on the inner wall 5 of the combustion chamber, the baffle bearing 9 is connected with the baffle blades 10, and the baffle blades 10 are connected with the driving ring 8; the drive ring 8 can rotate the barrier blades 10 at an angle around the barrier bearings 9. The baffle bearing 9 is arranged on the inner wall 5 of the combustion chamber, the baffle bearing 9 is connected with baffle blades 10, the baffle blades 10 are connected with a driving ring 8, the outer wall of the combustion chamber is in clearance fit with the baffle blades, and the baffle blades 10 can be ensured to rotate so as to prevent excessive gas from flowing through the clearance.
Further, the compressor 1 is connected with an air channel between the inner wall 5 of the combustion chamber and the outer wall 6 of the combustion chamber; the turbine 2 is connected with the bottom of the combustion chamber 4; the turbine 2 is connected with the compressor 1, one end of the compressor 1 is connected with the generator 3, the compressor 1 is provided with an air inlet 13, and the turbine 2 is provided with a waste gas outlet 14.
Air in the atmosphere enters the air compressor 1 through the air inlet 13, the air compressed by the air compressor 1 passes through an air channel between the inner wall 5 of the combustion chamber and the outer wall 6 of the combustion chamber and simultaneously plays a role of cooling the combustion chamber 4, the combustor 4 is provided with an air inlet and burns in the combustion chamber 4 together with fuel 12 through the combustor 7, high-temperature flue gas generated by combustion drives the turbine 2 to rotate and do work to drive the generator 3 to generate electricity, and finally the waste gas after doing work is discharged into the atmosphere or a waste heat boiler.
Further, the air introduced into the burner 7 directly participates in combustion and is called primary air, and the air introduced into the combustion chamber 4 through the secondary air port 11 formed in the inner wall 5 of the combustion chamber is called secondary air.
A device for adjusting the air intake of a combustion chamber of a gas turbine mainly comprises an air volume adjusting device consisting of baffle blades 10, a baffle bearing 9 and a driving ring 8, which is positioned in an air channel between the inner wall 5 of the combustion chamber and the outer wall 6 of the combustion chamber and is positioned between a secondary air port 11 and a combustor 7. The drive ring 8 can rotate the barrier blades 10 at an angle around the barrier bearings 9.
When the environmental temperature is higher in summer, the baffle blades 10 are driven to rotate by the driving ring 8, the included angle theta between the baffle blades 10 and the cross section of the combustion chamber is increased, more primary air enters the combustor 7 to participate in combustion, and when the baffle blades 10 are kept vertical, the primary air quantity is the largest, and the secondary air quantity is the smallest;
When the environmental temperature is lower in winter, the baffle blades 10 are driven to rotate by the driving ring 8, the angle theta of the baffle blades 10 is reduced, and the angle of an airflow channel between two adjacent baffle blades is reduced, so that the primary air quantity entering the combustor 7 is reduced, and more secondary air passes through the secondary air port 11 on the inner wall 5 of the combustor.
The ambient temperature affects not only the temperature of the air inlet of the compressor, but more importantly, the change of the air intake of the gas turbine compressor due to the change of the air density.
Generally, the density of air increases with decreasing ambient temperature, and the density of air at 30 ℃ in summer is about 1.1466kg/m 3The temperature of the winter environment is about 30-40 ℃ lower than that of the summer environment, so that the air density is relatively increased by 0.1651kg/m 3～0.1279kg/m3I.e. the air density is about 10% in winter compared to summer.
as shown in fig. 2, if the diameter of the combustion chamber 4 is D and the length of the baffle blades 10 is L, the cross-sectional area of the airflow channel between two adjacent baffle blades 10 is minimum when the included angle θ between the baffle blades and the cross-section of the combustion chamber is minimum.
The relationship between the angle θ between the baffle blades 10 and the cross section of the combustion chamber and the ambient temperature T is set as follows:
In the formula: t is maxAt the maximum ambient temperature, T minThe angle theta between the baffle blades 10 and the cross section of the combustion chamber can be adjusted manually for the lowest ambient temperature, or can be adjusted automatically by a servo motor according to the ambient temperature T.
As shown in fig. 3 the utility model discloses an in certain embodiment, the drive ring 8 is provided with one and stretches out the end, stretch out the end and articulate through the top of round pin axle with baffle blade and be connected, the drive ring 8 rotates and drives baffle blade 10 and use baffle bearing 9 to rotate as the centre of a circle, contained angle theta between baffle blade 10 and the combustion chamber cross section increases or reduces, airflow channel's between two adjacent baffle blades area increases along with it or reduces, under the circumstances that total amount of wind is confirmed, realize the air regulation of primary air and overgrate air.
The present invention is not described in detail in the prior art.
The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The combustion chamber of the gas turbine capable of adjusting the primary air and the secondary air is characterized by comprising a gas compressor (1), a turbine (2), a combustion chamber (4) and an air quantity adjusting device, wherein the combustion chamber (4) comprises a combustion chamber inner wall (5), a combustion chamber outer wall (6) and a combustor (7) arranged at the top of the combustion chamber inner wall (5); the combustor inner wall (5) with be equipped with the space between the combustor outer wall (6) and form air passage, be equipped with secondary air port (11) on the lateral wall of combustor inner wall (5), secondary air port (11) top with be equipped with air regulation device between combustor inner wall (5) top, just air regulation device install in combustor inner wall (5) with in the air passage between combustor outer wall (6), air regulation device is used for controlling air passage's air capacity.
2. The adjustable primary and secondary air gas turbine combustor of claim 1, wherein the compressor (1) is connected to an air passage between the combustor inner wall (5) and the combustor outer wall (6); the turbine (2) is connected with the bottom of the combustion chamber (4); the turbine (2) is connected with the air compressor (1), and one end of the air compressor (1) is connected with the generator (3).
3. The combustion chamber of a gas turbine with adjustable primary air and secondary air according to claim 1 or 2, characterized in that the compressor (1) is provided with an air inlet (13) and the turbine (2) is provided with an exhaust gas outlet (14).
4. The combustion chamber of the gas turbine capable of adjusting the primary air and the secondary air according to claim 1, wherein the air volume adjusting device comprises a baffle bearing (9), baffle blades (10) and a driving ring (8), the baffle bearing (9) is installed on the inner wall (5) of the combustion chamber, the baffle blades (10) are installed on the inner wall (5) of the combustion chamber through the baffle bearing (9), and the driving ring (8) is used for driving the baffle blades (10) to rotate by taking the baffle bearing (9) as a circle center.
5. The adjustable primary and secondary air gas turbine combustor of claim 4, wherein a plurality of baffle blades (10) are mounted in an annular array on the combustor inner wall (5), with an airflow channel formed between two adjacent baffle blades (10).
6. The adjustable primary and secondary air gas turbine combustor of claim 4, wherein the combustor outer wall (6) is clearance fit with the baffle blades (10).
7. Adjustable primary and secondary air gas turbine combustion chamber according to claim 4, characterized in that the drive ring (8) is hingedly connected to the barrier blades (10).
8. The combustion chamber of a gas turbine with adjustable primary and secondary air according to claim 1, characterized in that the secondary air port (11) is provided in plurality, and the plurality of secondary air ports (11) are uniformly distributed on the same height of the combustion chamber inner wall (5).
9. The adjustable primary and secondary air gas turbine combustor of claim 1, wherein said burners (7) are provided in plurality, a plurality of burners (7) being annularly arrayed on top of the combustor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921860921.XU CN211176890U (en) | 2019-10-31 | 2019-10-31 | Combustion chamber of gas turbine capable of adjusting primary air and secondary air |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921860921.XU CN211176890U (en) | 2019-10-31 | 2019-10-31 | Combustion chamber of gas turbine capable of adjusting primary air and secondary air |
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| CN211176890U true CN211176890U (en) | 2020-08-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110657451A (en) * | 2019-10-31 | 2020-01-07 | 中国华能集团有限公司 | Combustion chamber of gas turbine capable of adjusting primary air and secondary air and working method thereof |
| CN115234940A (en) * | 2022-06-21 | 2022-10-25 | 清航空天(北京)科技有限公司 | Rotary detonation combustion chamber with adjustable annular cavity |
-
2019
- 2019-10-31 CN CN201921860921.XU patent/CN211176890U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110657451A (en) * | 2019-10-31 | 2020-01-07 | 中国华能集团有限公司 | Combustion chamber of gas turbine capable of adjusting primary air and secondary air and working method thereof |
| CN110657451B (en) * | 2019-10-31 | 2023-08-25 | 中国华能集团有限公司 | Combustion chamber of gas turbine capable of adjusting primary air and secondary air and working method thereof |
| CN115234940A (en) * | 2022-06-21 | 2022-10-25 | 清航空天(北京)科技有限公司 | Rotary detonation combustion chamber with adjustable annular cavity |
| CN115234940B (en) * | 2022-06-21 | 2023-11-24 | 清航空天(北京)科技有限公司 | Rotary knocking combustion chamber with adjustable annular cavity |
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