JP6609494B2 - Grand Flare - Google Patents

Description

  The present invention relates to a ground flare used for burning and treating combustible exhaust gas.

  For example, the combined coal gasification combined power generation facility includes a coal supply device, a gasification device, a gas purification device, a gas turbine facility, a steam turbine facility, an exhaust heat recovery boiler, and the like. Therefore, the gasifier gasifies the coal supplied from the coal feeder, and the gas purifier removes impurities from the generated combustible gas to produce fuel gas, which is supplied to the gas turbine. The gas turbine is operated by this fuel gas to generate electric power, and the steam turbine is operated by using steam obtained by collecting exhaust heat of the gas turbine and exhaust heat of the gasification furnace to generate electric power.

  In such a coal gasification combined cycle power generation facility, when starting or stopping, the combustible gas generated by the gasifier is not supplied to the gas refining device or the gas turbine facility, for example, a flammable exhaust gas with ground flare. It is burned and processed. The ground flare is configured by arranging a plurality of burners in a chimney, incinerating a combustible exhaust gas by each burner, and discharging the generated exhaust gas to the outside through the chimney. In this case, since the ground flare has a configuration in which a plurality of burners are arranged in a chimney having an open end, an acoustic wave using the burner as an excitation source is generated, and this acoustic wave propagates as a plane wave. Then, the air vibrates greatly over the entire area of the plane wave, and low frequency vibrations that resonate and vibrate surrounding objects are generated.

  Thus, as a technique for suppressing the occurrence of this low frequency vibration, for example, there is one described in Patent Document 1 below. The ground flare described in Patent Document 1 is provided in a chimney with a burner installation area in which a burner is installed and a burner non-installation area that is larger than the burner and in which no burner is installed.

Japanese Patent Laying-Open No. 2015-059737

  By the way, the ground flare is used when the gasifier is started or stopped, but care must be taken so that the flame is not exposed from the chimney exit. The conventional ground flare described above can reduce the influence on the surroundings due to low-frequency vibration by providing a burner installation area and a burner non-installation area in the chimney. However, a large amount of air flows into the burner non-installation area, and the air is not utilized for combustion in the burner installation area, which may increase the flame length. Here, in order to reduce the flame length, it is conceivable to increase the amount of air supplied to the burner installation region to promote mixing and diffusion with fuel. In order to increase the amount of supplied air, it is conceivable to increase the length and diameter of the chimney, or install a blower or the like. However, this measure has a problem that the equipment is increased in size or requires additional equipment, resulting in an increase in equipment costs.

  The present invention solves the above-described problems, and provides a ground flare that reduces the flame length while suppressing the occurrence of low-frequency vibrations and promoting the mixing of air and fuel to suppress an increase in equipment cost. The purpose is to do.

  In order to achieve the above object, the ground flare of the present invention is provided with an exhaust gas exhaust part that is provided with an air introduction part into which combustion air is introduced at the lower end part in the vertical direction and exhausts combustion exhaust gas at the upper end part in the vertical direction. The chimney provided, the plurality of burners disposed in the air introduction part of the chimney in a part of the plane direction in the chimney, and the plurality of burners in the air introduction part of the chimney are not disposed And a closing plate provided in the region.

  Therefore, when air is introduced into the lower part of the chimney from the air introduction section and fuel is ejected from the plurality of burners, the fuel is processed by mixing and burning the air and the fuel. At this time, the blocking plate is provided in the area where the plurality of burners in the air introduction portion are not arranged, so that air is introduced into the chimney through the area where the plurality of burners are arranged, and the plurality of burners is It becomes difficult to be introduced into a region that is not arranged. Therefore, propagation of acoustic waves in the plane using the burner as an excitation source is suppressed, generation of low frequency vibrations can be suppressed, and mixing of air and fuel is promoted to suppress an increase in equipment cost. While the flame length can be reduced.

  In the ground flare of the present invention, the air introduction part of the chimney is provided with a burner arrangement area where the plurality of burners are arranged and a burner non-arrangement area where the plurality of burners are not installed, and the blocking plate Is provided in the burner non-arrangement region.

  Therefore, by providing a burner arrangement area and a burner non-arrangement area in the air introduction part of the chimney, and providing a closing plate in the burner non-arrangement area, inflow of air into the burner non-arrangement area is suppressed by the obstruction plate, and Generation of vibration can be suppressed and flame length can be reduced.

  The ground flare of the present invention is characterized in that a gap is provided between an end of the closing plate and the burner.

  Therefore, by providing a gap between the end of the closing plate and the burner, air can be efficiently supplied to a plurality of burners through this gap, and mixing of air and fuel is promoted to increase equipment costs. The flame length can be reduced while suppressing the above.

  The ground flare of the present invention is characterized in that the closing plate is provided vertically above the lower end of the chimney and below the fuel outlet in the burner in the vertical direction.

  Therefore, by providing the closing plate in the vertical direction above the lower end of the chimney and below the fuel outlet in the burner in the vertical direction, the closing plate is disposed at an appropriate position with respect to the chimney and the burner. The air supply to the burner can be promoted, and damage to the obstruction plate due to the flame can be suppressed.

  In the ground flare of the present invention, the plurality of burners are arranged on a central portion side at a lower end portion of the chimney, and the blocking plate is arranged along an inner wall surface of the chimney.

  Therefore, by arranging a plurality of burners on the chimney center side, it is possible to improve the ignitability by arranging a plurality of burners close to each other, and by disposing the closing plate along the inner wall surface of the chimney, The shape of the closing plate can be simplified and the cost can be reduced.

  In the ground flare of the present invention, the blocking plate has a ring shape, and an inner peripheral portion has a curved shape along the plurality of burners.

  Therefore, the inner peripheral portion of the closing plate can be along the outer peripheral portion of each burner, the gap between the burner and the closing plate can be set to be substantially constant in the circumferential direction, and the stability of combustion by the burner is ensured. be able to.

  In the ground flare of the present invention, the distance between the plurality of burners and the inner wall surface of the chimney is set to be larger than the distance between the plurality of burners.

  Therefore, by setting the distance between each burner and the inner wall surface of the chimney to be larger than the distance between each burner, the burner arrangement area and the burner non-arrangement area can be easily provided.

  According to the ground flare of the present invention, since the blocking plate is provided in the area where the plurality of burners in the air introduction part of the chimney is not disposed, it is possible to suppress the occurrence of low frequency vibration and to mix air and fuel. It is possible to reduce the flame length while suppressing the increase in the equipment cost.

FIG. 1 is a longitudinal sectional view of a main part of the ground flare of the present embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a schematic diagram showing a burner arrangement area and a burner non-arrangement area. FIG. 4 is a schematic configuration diagram showing a ground flare.

  Exemplary embodiments of a ground flare according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  IGCC: Integrated Coal Gasification Combined Cycle (IGCC) adopts an air combustion system that generates coal gas with a gasifier using air as an oxidizer, and fuels the coal gas after being refined with the gas purifier Electric power is generated by supplying the gas turbine equipment as gas. The ground flare burns and processes the combustible exhaust gas generated by the gasifier when it is started or stopped without supplying it to the gas purifier or gas turbine equipment. Is.

  FIG. 4 is a schematic configuration diagram showing a ground flare.

  In the present embodiment, as shown in FIG. 4, the ground flare 10 includes a chimney 11 and a plurality of burners 12.

  The chimney 11 is provided with an air inlet 22 at the lower end in the vertical direction in the cylindrical main body 21, and an exhaust gas outlet 23 at the upper end in the vertical direction of the main body 21. The plurality of burners 12 are provided at the air inlet 22 in the chimney 11. The windshield 24 is provided so as to surround the lower end of the chimney 11 and the periphery of the plurality of burners 12. The lower end portion of the chimney 11 and the plurality of burners 12 are surrounded by the windshield 24, so that the plurality of burners 12 are not affected by the surrounding wind and the flame from the burner 12 is not visible from the outside. Moreover, the space part is provided between the lower part of the chimney 11, and the windshield 24, and the top plate 25 is provided above this space part.

  Since the ground flare 10 configured in this manner has a configuration in which a plurality of burners 12 are disposed in a chimney 11 having upper and lower portions in the vertical direction open, an acoustic wave using the burners 12 as an excitation source is generated. When propagating in the plane direction, the air vibrates greatly, and low frequency vibration may occur. Further, in the ground flare 10, if the combustion air introduced into the chimney 11 is not sufficiently supplied to each burner 12, the flame length of each burner 12 may increase. Therefore, the ground flare 10 of the present embodiment is intended to achieve both suppression of generation of low-frequency vibration and suppression of increase in the flame length of the burner 12.

  1 is a longitudinal sectional view of a main part of the ground flare of the present embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a schematic diagram showing a burner arrangement area and a burner non-arrangement area.

  The ground flare 10 of this embodiment has the obstruction | occlusion board 13 provided in the area | region where the some burner 12 in the air introduction part 22 of the chimney 11 is not arrange | positioned, as shown in FIG.1 and FIG.2.

  That is, since the chimney 11 has a cylindrical shape, the air introduction part 22 is a circular space part. A plurality of (seven in this embodiment) burners 12 are arranged at the lower end in the vertical direction of the chimney 11, that is, on the center side of the air introduction part 22. The plurality of burners 12 are arranged in a ring shape so as to surround six burners 12 around one burner 12 arranged at the center of the air introduction part 22, and the distance between each burner 12. Are set to the same. Here, the distance between the plurality of burners 12 and the inner wall surface 11 a of the chimney 11 is set to be larger than the distance between the plurality of burners 12.

  Therefore, as shown in FIG. 3, the chimney 11 is divided into a burner arrangement area A in which the plurality of burners 12 are arranged, and a burner non-arrangement area B in which the plurality of burners 12 are not installed. Is done. The boundary between the burner arrangement area A and the burner non-arrangement area B is a circular tangent line C that contacts the outer peripheral surface of the plurality of burners 12 arranged in a ring shape. That is, in the chimney 11, the burner arrangement area A is set at the center of the air introduction part 22 in the plane direction, and the burner non-arrangement area B is set on the outer peripheral side.

  A plurality of burners 12 are arranged in the burner arrangement area A, and the closing plate 13 is arranged in the burner non-arrangement area B. As shown in FIGS. 1 and 2, the closing plate 13 has a ring shape, an outer peripheral portion is disposed along the inner wall surface 11 a of the chimney 11, and is fixed to the inner wall surface 11 a of the chimney 11. The closing plate 13 has a gap between the outer peripheral portion and the outer peripheral portion of each burner 12. Specifically, the closing plate 13 has a curved shape in which the inner peripheral surface 13a extends along the outer peripheral surface of each burner 12, and has a petal shape as a whole. However, the closing plate 13 is not limited to the petal shape of the inner peripheral surface 13a, and may be a circular shape.

  Moreover, the several burner 12 is provided with the jet nozzle 31 opened upwards so that combustible exhaust gas (fuel) may be ejected toward the upper direction of a perpendicular direction. In the plurality of burners 12, the height positions of the chimney 11 and the burner 12 are adjusted so that the respective ejection ports 31 are located in the chimney 11. The closing plate 13 is provided above the lower end of the chimney 11 in the vertical direction and below the jet port 31 in the burner 12 in the vertical direction. That is, the closing plate 13 is desirably provided at a height position between the lower end portion of the chimney 11 and the ejection port 31 in the burner 12.

  Therefore, external air is introduced from the air introduction part 22 of the chimney 11 to the lower part of the chimney 11, and combustible exhaust gas is ejected upward from the ejection ports 31 of the plurality of burners 12. Here, when the combustible exhaust gas is ignited by an ignition source (not shown), the combustible exhaust gas is processed by mixing and burning the air and the combustible exhaust gas. At this time, since the closing plate 13 is provided in the burner non-arrangement region B where the burners 12 in the air introduction part 22 are not arranged, the air introduced from the air introduction part 22 to the lower part of the chimney 11 is not burner arranged. It becomes difficult to flow into the region B and is supplied to each burner 12 through the burner arrangement region A. Then, each burner 12 is supplied with sufficient air to promote combustion.

  As a result, even if an acoustic wave is generated using the burner 12 as an excitation source, the acoustic wave is less likely to propagate as a plane wave, and the generation of low-frequency vibrations that resonate and vibrate surrounding objects due to large vibration of air is suppressed. Is done. Moreover, it becomes difficult for air to flow into the burner non-installation area B, the air is appropriately utilized for combustion in the burner arrangement area A, and an increase in the flame length of the burner 12 is suppressed. Therefore, in order to increase the amount of air supplied to the burner 12, it is not necessary to increase the length and diameter of the chimney 11, or to additionally install a blower or the like, and the increase in equipment cost is suppressed.

  As described above, in the ground flare of the present embodiment, the exhaust gas discharge part 23 is provided with the air introduction part 22 into which combustion air is introduced at the lower end part in the vertical direction and exhausts the combustion exhaust gas at the upper end part in the vertical direction. Are provided, a plurality of burners 12 disposed in the air introduction part 22 of the chimney 11 in a part of the plane direction in the chimney 11, and a plurality of burners 12 in the air introduction part 22 of the chimney 11 are arranged. And a closing plate 13 provided in a region that is not provided.

  Therefore, when air is introduced into the lower part of the chimney 11 from the air introduction part 22 and the combustible exhaust gas is ejected from the plurality of burners 12, the air and combustible exhaust gas are mixed and burned. Exhaust gas is treated. At this time, air is introduced into the chimney 11 through the region where the plurality of burners 12 are disposed by providing the closing plate 13 in the region where the plurality of burners 12 are not disposed in the air introduction portion 22. , It becomes difficult to be introduced into the region where the plurality of burners 12 are not arranged. Therefore, propagation of acoustic waves using the burner 12 as an excitation source in the plane is suppressed, generation of low-frequency vibrations can be suppressed, and mixing of air and combustible exhaust gas is promoted to increase equipment costs. The flame length can be reduced while suppressing the above.

  In the ground flare of this embodiment, a burner arrangement area A where a plurality of burners 12 are arranged and a burner non-arrangement area B where a plurality of burners 12 are not installed are provided, and the closing plate 13 is placed in the burner non-arrangement area B. Provided. Therefore, the inflow of air to the burner non-arrangement region B is suppressed by the closing plate 13 and generation of low frequency vibration can be suppressed, and the flame length can be reduced.

  In the ground flare of the present embodiment, a gap is provided between the end of the closing plate 13 and the burner 12. Therefore, air is efficiently supplied to the plurality of burners 12 through the gaps, and the flame length can be reduced while promoting the mixing of the air and the combustible exhaust gas and suppressing an increase in equipment cost.

  In the ground flare of the present embodiment, the closing plate 13 is provided above the lower end of the chimney 11 in the vertical direction, and below the combustible exhaust gas outlet 31 in the burner 12 in the vertical direction. Therefore, by disposing the closing plate 13 at an appropriate position with respect to the chimney 11 and the burner 12, the supply of air to the burner 12 can be promoted, and damage to the closing plate 13 due to a flame can be suppressed.

  In the ground flare of the present embodiment, the burner 12 is disposed on the center side of the lower end portion of the chimney 11, and the closing plate 13 is disposed along the inner wall surface 11 a of the chimney 11. Therefore, by arranging the plurality of burners 12 on the central portion side of the chimney 11, the burners 12 can be arranged close to each other to improve the ignitability, and the closing plate 13 is arranged along the inner wall surface of the chimney 11. By doing so, the shape of the closing plate 13 can be simplified and the cost can be reduced.

  In the ground flare of this embodiment, the closing plate 13 has a ring shape, and the inner peripheral portion has a curved shape along the plurality of burners 12. Accordingly, the inner peripheral portion of the closing plate 13 can be along the outer peripheral portion of each burner 12, and the gap between the burner 12 and the closing plate 13 can be set to be substantially constant in the circumferential direction. Stability can be ensured.

  In the ground flare of this embodiment, the distance between the plurality of burners 12 and the inner wall surface 11a of the chimney 11 is set larger than the distance between the plurality of burners 12. Therefore, the burner arrangement area A and the burner non-arrangement area B can be easily provided.

  In the embodiment described above, the chimney 11 is provided with the burner arrangement area A on the center side, the burner non-arrangement area B on the outer peripheral side, and a plurality of burners in the burner arrangement area A in the air introduction part 22. 12 is disposed and the closing plate 13 is disposed in the burner non-arrangement region B, but is not limited to this configuration. For example, in the air introduction part 22 of the chimney 11, a burner arrangement area A is provided on the outer peripheral side, a burner non-arrangement area B is provided on the center side, and a plurality of burners 12 are arranged in a ring shape in the burner arrangement area A. The disc-shaped blocking plate 13 may be disposed in the burner non-arrangement region B. Further, the burner arrangement area A and the burner non-arrangement area B may be alternately provided in the circumferential direction in the air introduction part 22 of the chimney 11.

DESCRIPTION OF SYMBOLS 10 Ground flare 11 Chimney 12 Burner 13 Blocking plate 21 Main body 22 Air introduction port (air introduction part)
23 Exhaust gas outlet (exhaust gas exhaust part)
31 Spout A A Burner placement area B Burner non-placement area C Tangent (boundary)

Claims (6)

A chimney provided with an air introduction part for introducing combustion air at the lower end in the vertical direction and provided with an exhaust gas discharge part for discharging combustion exhaust gas at the upper end in the vertical direction;
A plurality of burners arranged in the air introduction part of the chimney in a part of the plane direction in the chimney;
A closing plate provided in a region where the plurality of burners in the air introduction portion of the chimney are not disposed;
Bei to give a,
The closing plate is provided vertically above the lower end of the chimney and vertically below the fuel outlet in the burner.
A ground flare characterized by that.   The air introduction part of the chimney is provided with a burner arrangement area in which the plurality of burners are arranged, and a burner non-arrangement area in which the plurality of burners are not installed, and the closing plate is in the burner non-arrangement area The ground flare according to claim 1, wherein the ground flare is provided on the ground.   The ground flare according to claim 1 or 2, wherein a gap is provided between an end of the closing plate and the burner. The said some burner is arrange | positioned at the center part side in the lower end part of the said chimney, The said obstruction board is arrange | positioned along the inner wall face of the said chimney, The any one of Claims 1-3 characterized by the above-mentioned. The ground flare according to one item. The ground flare according to claim 4 , wherein the closing plate has a ring shape, and an inner peripheral portion has a curved shape along the plurality of burners. The ground flare according to claim 4 or 5 , wherein a distance between the plurality of burners and an inner wall surface of the chimney is set larger than a distance between the plurality of burners.

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