CN215174993U - Air quantity and rotational flow double-regulation burner - Google Patents
Air quantity and rotational flow double-regulation burner Download PDFInfo
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- CN215174993U CN215174993U CN202121192110.4U CN202121192110U CN215174993U CN 215174993 U CN215174993 U CN 215174993U CN 202121192110 U CN202121192110 U CN 202121192110U CN 215174993 U CN215174993 U CN 215174993U
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- air duct
- secondary air
- rotational flow
- burner
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Abstract
A double-regulation burner with air volume and rotational flow comprises a primary air duct, a central air duct, a primary air duct, a central air duct and a secondary air duct, wherein outlets of the primary air duct and the central air duct are connected with the burner; the secondary air duct comprises an inner secondary air duct and an outer secondary air duct, an inner secondary air duct air quantity adjusting device and an inner secondary air duct rotational flow strength adjusting device are arranged in the inner secondary air duct, and an outer secondary air duct air quantity adjusting device and an outer secondary air duct rotational flow strength adjusting device are arranged in the outer secondary air duct. The utility model discloses can realize that the secondary amount of wind and secondary wind whirl intensity independently adjust, each other does not influence, can all adjust the secondary amount of wind and secondary wind whirl intensity to the optimum value under various operating modes to obtain stable burning and good in-furnace air dynamic field, avoided traditional combustor secondary wind whirl intensity can not adjust or the amount of wind and whirl intensity can only the drawback of reverse adjustment.
Description
Technical Field
The utility model belongs to the thermal power field, concretely relates to amount of wind and whirl dual regulation combustor.
Background
The combustion modes of the large-scale thermal power generating unit mainly include tangential circle combustion and opposed firing. The burner of the opposed firing boiler is a cyclone burner, and the guarantee of proper primary and secondary air volume and cyclone strength is of great importance. When the burner operates, the secondary air generates rotational flow with certain strength, so that high-temperature flue gas can be effectively sucked, the mixing of pulverized coal and flue gas is enhanced, and the rapid ignition and stable combustion of the pulverized coal are facilitated. For coal types with different volatile matters, the swirl strength and the air volume need to be properly adjusted in order to control a proper ignition point. Not only the burning loss and slag bonding of the burner caused by too close firing distance are avoided, but also the burning loss and unstable burning caused by the fire dropping of the burner caused by too far firing distance are avoided. When the combustor stops operating, ventilation cooling is needed, at the moment, the entrainment effect of the rotational flow secondary air can generate negative influence, and the key is enough secondary air quantity. If the swirl strength and the air volume can not be adjusted or can not be independently adjusted, one parameter is increased or decreased, the other parameter can be fixedly changed, which is not favorable for the flexible adjustment of the operation and standby of the burner. In a thermal power generating unit in service, the cyclone burner often has the defect of the design. The swirl strength of part of the burners cannot be adjusted, and the burners have poor adaptability to coal types and are easy to burn. The secondary air quantity and the swirl of part of the burner are adjusted by changing the distance between the adjusting element and the burner nozzle, when the adjusting element is closest to the burner nozzle, the secondary air quantity is minimum, and the swirl strength of the secondary air is strongest; when the adjusting element is farthest away from the outer secondary air inlet, the air quantity of the outer secondary air is the largest, and the swirling intensity of the outer secondary air is the weakest. Namely, the combination mode of the air volume and the rotational flow strength is limited, and flexible and independent adjustment cannot be achieved.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model aims at providing an amount of wind and whirl dual regulation combustor, this combustor can solve the unable independent problem of adjusting of amount of wind and whirl intensity, can be to the different operating modes of boiler, and to the amount of wind and the whirl intensity of overgrate air respectively independent control to obtain good stove interior air force field, avoid slagging scorification, high temperature corrosion, a series of problems such as the deviation of cigarette temperature is big, provide effectual adjustment means for the operation of boiler safety and stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a double-regulation burner with air volume and rotational flow comprises a primary air duct, a central air duct, a primary air duct, a central air duct and a secondary air duct, wherein outlets of the primary air duct and the central air duct are connected with the burner;
the secondary air duct comprises an inner secondary air duct and an outer secondary air duct, an inner secondary air duct air quantity adjusting device and an inner secondary air duct rotational flow strength adjusting device are arranged in the inner secondary air duct, and an outer secondary air duct air quantity adjusting device and an outer secondary air duct rotational flow strength adjusting device are arranged in the outer secondary air duct.
The utility model discloses a further improvement lies in, and the mouth of a tuber pipe entry is provided with a tuber pipe entry isolation door.
The utility model discloses further improvement lies in, and central tuber pipe is inside to be provided with central tuber pipe air regulation device.
The utility model discloses further improvement lies in, and interior secondary air duct air regulation device and outer secondary air duct air regulation device are baffle or flashboard door.
The utility model discloses further improvement lies in that interior secondary air duct air regulation device and outer secondary air duct air regulation device are a plurality ofly.
The utility model discloses further improvement lies in, interior secondary air duct whirl intensity adjusting device and outer secondary air duct whirl intensity adjusting device are stator or whirlwind.
The utility model discloses further improvement lies in that interior secondary wind channel whirl intensity adjusting device and outer secondary wind channel whirl intensity adjusting device are a plurality of.
The utility model is further improved in that when the burner is operated, if the volatile content of the coal as fired is increased, the swirl strength of the secondary air is reduced by the inner secondary air swirl strength adjusting device and the outer secondary air swirl strength adjusting device, thereby avoiding the burner from being burnt and damaged due to the over-close ignition distance of the pulverized coal; if the load of the boiler is changed, the secondary air quantity is changed through the outer secondary air duct air quantity adjusting device and the outer secondary air duct air quantity adjusting device so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
The utility model is further improved in that when the burner is operated, if the volatile content of the coal as fired is reduced, the swirl strength of the secondary air is increased by the inner secondary air channel swirl strength adjusting device and the outer secondary air channel swirl strength adjusting device; if the load of the boiler is changed, the secondary air quantity is changed through the outer secondary air duct air quantity adjusting device and the outer secondary air duct air quantity adjusting device so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
The utility model discloses further improvement lies in, when the combustor was stopped using, through interior secondary wind channel whirl intensity adjusting device and outer secondary wind channel whirl intensity adjusting device with whirl intensity adjustment for zero.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses can realize that the secondary amount of wind and secondary wind whirl intensity independently adjust, each other does not influence, can all adjust the secondary amount of wind and secondary wind whirl intensity to the optimum value under various operating modes to obtain stable burning and good in-furnace air dynamic field, avoided traditional combustor secondary wind whirl intensity can not adjust or the amount of wind and whirl intensity can only the drawback of reverse adjustment.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure, 1 is a primary air duct, 2 is a central air duct, 3 is a secondary air duct, 4 is an inner secondary air duct air quantity adjusting device, 5 is an inner secondary air duct rotational flow intensity adjusting device, 6 is an outer secondary air duct air quantity adjusting device, 7 is an outer secondary air duct rotational flow intensity adjusting device, 8 is a central air duct air quantity adjusting device, and 9 is a primary air duct inlet isolation door.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the burner of the present invention comprises a primary air pipe 1, a central air pipe 2, an air volume adjusting device and a rotational flow intensity adjusting device. The air quantity regulating device can be a baffle, a gate or other mechanical devices, and the rotational flow strength regulating device can be a guide vane, a cyclone or other mechanical devices. The outlets of the primary air pipe 1, the central air pipe 2 and the secondary air duct 3 are all connected with the burner.
Specifically, the secondary air duct 3 includes an inner secondary air duct and an outer secondary air duct, a plurality of inner secondary air duct air volume adjusting devices 4 and inner secondary air duct swirl intensity adjusting devices 5 are provided in the inner secondary air duct, and a plurality of outer secondary air duct air volume adjusting devices 6 and outer secondary air duct swirl intensity adjusting devices 7 are provided in the outer secondary air duct.
The inlet of the primary air pipe 1 is provided with a primary air pipe inlet isolation door 9, and the inside of the central air pipe 2 is provided with a central air pipe air quantity adjusting device 8.
When the burner is operated, if the volatile content of the coal as fired is increased, the swirl strength of the secondary air can be properly reduced through the inner secondary air channel swirl strength adjusting device 5 and the outer secondary air channel swirl strength adjusting device 7, so that the phenomenon that the secondary air quantity is unchanged when the pulverized coal is ignited at an excessively short distance and the burner is burnt is avoided. If the load is changed, the secondary air quantity can be changed through the inner secondary air duct air quantity adjusting device 4 and the outer secondary air duct air quantity adjusting device 6 so as to fit a load-oxygen quantity curve given by a combustion adjustment test, and at the moment, the rotational flow strength is unchanged. Therefore, the secondary air quantity and the swirl strength required by the burner can reach the optimal values under the working condition.
When the burner is out of service, secondary air is needed to cool the burner nozzle. At the moment, the rotational flow intensity is adjusted to be zero through the inner secondary air duct rotational flow intensity adjusting device 5 and the outer secondary air duct rotational flow intensity adjusting device 7, namely, the secondary air is direct-current air, so that the best cooling effect is obtained, and the deformation caused by burning loss of high-temperature flue gas during the shutdown is avoided.
Example 1
Referring to fig. 1, when the burner is operated, if the volatile content of the coal as fired is increased, the swirl strength of the secondary air can be properly reduced by the inner secondary air swirl strength adjusting device 5 and the outer secondary air swirl strength adjusting device 7, so that the phenomenon that the burner is burnt and damaged due to too short ignition distance of the coal powder is avoided, and the secondary air volume is not changed. If the load of the boiler is changed, the secondary air quantity can be changed through the outer secondary air duct air quantity adjusting device 4 and the outer secondary air duct air quantity adjusting device 6 so as to fit a load-oxygen quantity curve given by a combustion adjustment test, and at the moment, the rotational flow strength is unchanged. Therefore, the secondary air quantity and the swirl strength required by the burner can reach the optimal values under the working condition.
When the burner is operated, if the volatile content of the coal as fired is reduced, the swirl strength of the secondary air can be properly increased through the inner secondary air duct swirl strength adjusting device 5 and the outer secondary air duct swirl strength adjusting device 7, so that the phenomenon that the burner is off fire due to the fact that the ignition distance of the coal powder is too far is avoided; meanwhile, the capability of secondary air for absorbing high-temperature flue gas is enhanced, enough heat is provided for the initial ignition and the middle and later period stable combustion of the pulverized coal, the stability of flame in the furnace is ensured, and the secondary air quantity is unchanged. If the load of the boiler is changed, the secondary air quantity can be changed through the outer secondary air duct air quantity adjusting device 4 and the outer secondary air duct air quantity adjusting device 6 so as to fit a load-oxygen quantity curve given by a combustion adjustment test, and at the moment, the rotational flow strength is unchanged. Therefore, the secondary air quantity and the swirl strength required by the burner can reach the optimal values under the working condition.
When the burner is out of service, secondary air is needed to cool the burner nozzle. At the moment, the rotational flow intensity is adjusted to be zero through the inner secondary air duct rotational flow intensity adjusting device 5 and the outer secondary air duct rotational flow intensity adjusting device 7, namely, the secondary air is direct-current air, so that the best cooling effect is obtained, and the deformation caused by burning loss of high-temperature flue gas during the shutdown is avoided.
Claims (10)
1. The burner with double regulation of air volume and rotational flow is characterized by comprising a primary air pipe (1), a central air pipe (2), the primary air pipe (1), the central air pipe (2) and a secondary air duct (3), wherein the outlets of the primary air pipe, the central air pipe and the secondary air duct are connected with the burner;
the secondary air duct (3) comprises an inner secondary air duct and an outer secondary air duct, an inner secondary air duct air quantity adjusting device (4) and an inner secondary air duct rotational flow strength adjusting device (5) are arranged in the inner secondary air duct, and an outer secondary air duct air quantity adjusting device (6) and an outer secondary air duct rotational flow strength adjusting device (7) are arranged in the outer secondary air duct.
2. An air volume and rotational flow double-regulation burner as claimed in claim 1, characterized in that the primary air duct (1) inlet is provided with a primary air duct inlet isolation door (9).
3. The burner with double regulation of air volume and rotational flow as claimed in claim 1, characterized in that the central air duct (2) is internally provided with a central air duct air volume regulation device (8).
4. The burner of claim 1, wherein the inner secondary air duct air volume adjusting device (4) and the outer secondary air duct air volume adjusting device (6) are baffles or gate doors.
5. The burner of claim 1, wherein the inner secondary air duct air volume adjusting device (4) and the outer secondary air duct air volume adjusting device (6) are plural.
6. The air volume and rotational flow double-regulation burner as claimed in claim 1, wherein the inner secondary air duct rotational flow intensity regulation device (5) and the outer secondary air duct rotational flow intensity regulation device (7) are guide vanes or cyclones.
7. The burner of claim 1, wherein the number of the inner secondary air duct swirl strength adjusting devices (5) and the outer secondary air duct swirl strength adjusting devices (7) is plural.
8. The burner with double regulation of air volume and rotational flow according to claim 1, characterized in that when the burner is operated, if the volatile matter of the coal as fired is increased, the rotational flow intensity of the secondary air is reduced by the rotational flow intensity regulating device (5) of the inner secondary air duct and the rotational flow intensity regulating device (7) of the outer secondary air duct, so that the burner is prevented from being burnt and damaged due to too close ignition distance of the pulverized coal; if the load of the boiler is changed, the secondary air quantity is changed through the inner secondary air duct air quantity adjusting device (4) and the outer secondary air duct air quantity adjusting device (6) so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
9. The burner with double regulation of air volume and rotational flow as claimed in claim 1, wherein when the burner is operated, if the volatile matter of the coal as fired is reduced, the rotational flow intensity of the secondary air is increased by the inner secondary air duct rotational flow intensity regulating device (5) and the outer secondary air duct rotational flow intensity regulating device (7); if the load of the boiler is changed, the secondary air quantity is changed through the inner secondary air duct air quantity adjusting device (4) and the outer secondary air duct air quantity adjusting device (6) so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
10. An air volume and rotational flow double-regulation burner as claimed in claim 1, characterized in that when the burner is not used, the rotational flow intensity is adjusted to zero by the inner secondary air duct rotational flow intensity adjusting device (5) and the outer secondary air duct rotational flow intensity adjusting device (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121192110.4U CN215174993U (en) | 2021-05-31 | 2021-05-31 | Air quantity and rotational flow double-regulation burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121192110.4U CN215174993U (en) | 2021-05-31 | 2021-05-31 | Air quantity and rotational flow double-regulation burner |
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| CN215174993U true CN215174993U (en) | 2021-12-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188120A (en) * | 2021-05-31 | 2021-07-30 | 西安热工研究院有限公司 | Air quantity and rotational flow double-regulation burner |
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2021
- 2021-05-31 CN CN202121192110.4U patent/CN215174993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188120A (en) * | 2021-05-31 | 2021-07-30 | 西安热工研究院有限公司 | Air quantity and rotational flow double-regulation burner |
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