KR102013035B1 - Flare Tip Apparatus with vertical flow path - Google Patents

Abstract

The present invention relates to a flare tip device having a vertical cross-linking device, and more particularly, to a 'vertical cross-flared tip device' for preventing vortices and having improved air flow while being used to easily burn waste gas discharged into the atmosphere. It is about.
According to one embodiment of the present invention, a flare tip device having a vertical cross-section includes: a stack pipe part configured to guide the flare gas so that the flare gas rises in a vertical direction; And a nozzle tip portion spaced apart from the upper end portion of the stack pipe portion by a predetermined interval, wherein the nozzle tip portion has a narrow upper and lower portions and is filled with a jar, and the flare gas rises in a vertical direction and flows along the first radius of curvature. A first coanda portion, a second coanda portion extending from the first coanda portion having a second radius of curvature, and a third coanda portion extending from the second coanda portion and having a third radius of curvature. Wherein the first radius of curvature is less than the second radius of curvature and is equal to the third radius of curvature and the third coanda portion outer diameter is less than the second coanda portion outer diameter and greater than the first coanda portion outer diameter. The flare gas flows outward along the curved surface of the first radius of curvature to bend upward along the surface of the second radius of curvature and is burned to the third radius of curvature to be burned. Having a predetermined depth in the vertical direction of the side groups (氣 路) are added to form a plurality prevents vortices generated.

Description

Flare Tip Apparatus with vertical flow path {Flare Tip Apparatus with vertical flow path}

The present invention relates to a flare tip device having a vertical cross-linking device, and more particularly, to a 'vertical cross-flared tip device' for preventing vortices and having improved air flow while being used to easily burn waste gas discharged into the atmosphere. It is about.

Floating Production Storage and Offloading (FPSO), one of the facilities for producing and storing crude oil in the ocean, produces crude oil while floating above the ocean (Production), storing it in huge tanks formed under ships (Storage), and Offloading oil stored through the same carrier.

These FPSOs are known to be suitable for deep sea oilfield development because they can be stored and unloaded from crude oil mining at sea and are free to move, and various facilities necessary for crude oil refining, gas compression, crude oil unloading, seawater injection, and self-generation It is also called as an oil refinery floating on the sea.

On the other hand, a fixed platform, another facility for producing and storing crude oil in the ocean, is a marine structure supported at the bottom of the sea floor by legs, usually made of metal such as concrete or iron. ) Is equipped with drilling equipment, production facilities and living quarters. Since these fixed platforms are basically immovable structures, they are usually designed to be used for a long time.

These petroleum production facilities, FPSO and Fixed Platform, are equipped with a flare stack for burning insoluble gases generated during petroleum production.

Figure 1 shows an example of a flare stack that is a structure for burning unnecessary gas installed in such FPSO, Fixed Platform, and the like.

As shown in FIG. 1, a flare tip, which is a site for burning insoluble gas, is located at the peak of the flare stack. Flare tip is a kind of burner for burning unnecessary gas generated in the process of producing oil and gas at sea.

As such, in a production platform for developing petroleum and natural gas from an offshore oil field, some of the incidental natural gas with oil is used as fuel for production platform equipment and the remaining surplus gas is incinerated in the flare stack. .

The purpose of incineration of surplus gas through the flare stack is to safely incinerate and discharge dangerous substances (flammable gases, flammable substances, toxic substances, etc.) contained in the surplus gas.

In other words, the flare stack is a facility that collects waste gas from the production platform equipment and completely burns it in one place, and the flare tip at the top of the flare stack always has surplus gas to prevent the above-mentioned dangerous substances from being released into the atmosphere. It will maintain a flame to burn.

Such a flame is called a flare, and the flare tip from which the flare is discharged is installed at a high position or is isolated from the production platform, thereby preventing the various equipment of the production platform from being damaged by the heat of the flare.

In addition, the flare device also includes a header line, gas-liquid separator, a seal to prevent back fire, and a flare tip for stable combustion, serving to collect excess gas from each piece of equipment in offshore structures. ).

The flare tip can be divided into HP tip (low pressure tip) and LP tip (low pressure tip) according to the injection pressure of the gas, and sub-sonic tip and according to the injection speed of the gas at the nozzle outlet It may be divided into a sonic tip.

The sonic speed tip can inject gas at a higher speed than the sonic speed (more than Mach 1 supersonic speed), which has the advantage of increasing combustion efficiency.

However, since the gas injection speed exceeds the speed of sound, there is a sudden speed difference between the gas injection airflow over the speed of sound and the atmosphere near the flare tip, which causes the waste gas to be released into the atmosphere to mix. Unfolded in the direction, close to the surface of the object does not flow, there is a problem that the waste gas flow is not formed smoothly, hinders the flow, and the problem that vortex occurs or lowers the discharge rate.

Korean Patent Registration No. 10-0849662, titled 'Combustion Aid for Flare Stack' (Registration date 2008.07.25.)

The present invention has been made to solve the above problems, to provide a 'vertical cross-flared tip device' that is used to easily burn the waste gas discharged into the atmosphere while preventing eddy currents and has an improved air flow. There is this.

In order to solve the above problems, a flare tip device having a vertical cross-section according to an embodiment of the present invention includes a stack pipe portion for guiding the flare gas so that the flare gas rises in the vertical direction; And a nozzle tip portion spaced apart from the upper end portion of the stack pipe portion by a predetermined interval, wherein the nozzle tip portion has a narrow upper and lower portions and is filled with a jar, and the flare gas rises in a vertical direction and flows along the first radius of curvature. A first coanda portion, a second coanda portion extending from the first coanda portion having a second radius of curvature, and a third coanda portion extending from the second coanda portion and having a third radius of curvature. Wherein the first radius of curvature is less than the second radius of curvature and is equal to the third radius of curvature and the third coanda portion outer diameter is less than the second coanda portion outer diameter and greater than the first coanda portion outer diameter. The flare gas flows outward along the curved surface of the first radius of curvature to bend upward along the surface of the second radius of curvature and is burned to the third radius of curvature to be burned. Having a predetermined depth in the vertical direction of the side groups (氣 路) portion is formed to prevent eddy current generation.

Since the present invention includes a streamlined nozzle tip portion, it is possible to reduce the occurrence of noise or vibration by increasing the Coanda effect flowing along the surface of the object without a great change to the overall structure of the flare stack or flare system.

In addition, due to the streamlined nozzle tip part, the flare gas in the stack tube part may be naturally discharged to the slot part, and thus combustion may be stably made.

In addition, since the nozzle tip portion has the first to third coanda portion, there is an advantage that the posture is stabilized to facilitate the discharge of the flare gas along the surface from the bottom to the top.

In addition, the nozzle tip has an advantage that the cross-section is formed in the vertical direction on the surface to increase the discharge rate and suppress the generation of vortex.

1 is a diagram illustrating a general flare stack in which flares occur.
FIG. 2 is a conceptual view illustrating a flare device having a flare tip installed in an offshore structure.
3 is an exemplary diagram for explaining a Coanda Effect.
4 is a schematic cross-sectional view (a) and a plan view (b) for explaining a flared tip device having a vertical cross-section according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the term "comprising" embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

The embodiments of the present invention described with reference to the drawings specifically illustrate an ideal embodiment of the present invention. As a result, various modifications of the drawings are expected. Thus, embodiments are not limited to the specific forms of the illustrated areas. Areas shown or described as flat may have characteristics that are generally rough and / or non-linear.

Also, portions shown to have sharp angles may be rounded. Accordingly, the regions shown in the figures are only approximate in nature, and their forms are not intended to depict the exact form of the regions, nor are they intended to narrow the scope of the invention.

It is noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting. And the same structure, element, or part that appears in more than one figure is the same reference numeral used in different embodiments to indicate corresponding or similar features.

For reference, in the present invention, a flare tip is a kind of burner for burning unnecessary gas generated in the process of producing oil and gas at sea, and a flare stack. Refers to a tall structure in which the flare tip is installed away from the main platform for safety.

In addition, the Coanda Effect refers to a phenomenon in which the flow of gas injected in the tangential direction of the curved surface is in close contact with the surface along the curved surface of the object.

FIG. 2 is a conceptual diagram illustrating a state in which a flare device having a flare tip is installed in an offshore structure, FIG. 3 is an exemplary view for explaining a Coanda Effect, and FIG. 4 is an embodiment of the present invention. The schematic cross-sectional view (a) and plan view (b) for explaining the flared tip device in which the vertical riser is formed.

Referring to FIG. 2, the flare device 2 provided on the offshore structure 1 may include a header line 10, a gas-liquid separator 20, and a flare tower 30.

The header line 10 collects gases such as waste gas and BOG generated from offshore structures. Since the gas may contain water, oil, and the like, the gas-liquid separator 20 separates and discharges liquid components such as water and oil in the collected gas. In addition, the gas-liquid separator 20 may precipitate impurities contained in the gas and remove the impurities using a purge gas. The gas passed through the gas-liquid separator 20 is transferred to the flare tower 30 by a gas supply device such as a pump.

The flare tower 30 may include a flare tip 31 provided at the top, a gas supply pipe 32 for supplying fuel to the flare tip device 31, and a gas ignition device for ignition. The gas is transferred to the flare tip device 100 provided at the top of the flare tower 30 through the gas supply pipe 32 of the flare tower 30, and burned while being injected from the flare tip 31.

In particular, as shown in FIG. 3, the flare tip 31 of the related art blocks the stack tube part 31a by the lower part of the nozzle tip part 31b so that flare gas collides with the bottom surface of the nozzle tip part 31b. To impede the flow of flare gas discharged into the air, generating a strong vertical upward pressure on the nozzle tip portion 31b, and damaging the connection portion between the stack tube portion 31a and the nozzle tip portion 31b or incomplete combustion. And vortex may be generated on the surface of the nozzle tip portion 31b.

Accordingly, the present inventor proposes a flared tip device 100 having a vertical cross-section according to an embodiment of the present invention as follows.

As shown in FIG. 4, the flared tip device 100 having a vertical cross section according to the present invention includes a stack pipe part 110 for guiding the flare gas G so that the flare gas G rises in a vertical direction. And a nozzle tip portion 120 spaced apart from the upper end portion of the stack pipe portion 110 by a predetermined interval, and the nozzle tip portion 120 has a narrow upper and lower portions and is filled with a jar, and the flare gas G is in a vertical direction. A second nose having a first radius of curvature R1 extending upwardly and curved along the first radius of curvature R1 and a second radius of curvature R2 extending with the first radius of curvature 121. Anda part 123, and the third coanda portion (123) extending from the second coanda portion 123 having a third radius of curvature (R3) connected to form a streamline, the first radius of curvature (R1) ) Is smaller than the second radius of curvature (R2) and the same as the third radius of curvature (R3) and the outer diameter (d3) of the third coanda portion 125 is The surface smaller than the outer diameter d2 of the second coanda part 123 and larger than the outer diameter d1 of the first coanda part 121, and the flared gas G is curved outwardly to the first radius of curvature R1. Flows along the surface of the second radius of curvature (R2) to rise and then bend to the third radius of curvature (R3) to be burned, the vertical of the surface of the nozzle tip portion 120 along the flare gas (G) A large number of airway portions 120g having a predetermined depth in the direction of) are formed to prevent vortex generation.

In addition, according to the present invention, the nozzle tip portion 120 is a cylindrical hollow portion (120h) is formed from the upper side to the center is capable of fastening the anchor bolt therein.

Then, the configuration and operation of the vertical flare tip device 100 according to an embodiment of the present invention will be described in detail.

Referring to FIG. 4, the flare tip device 100 proposed in the present invention may be largely divided into a stack pipe part 110 and a nozzle tip part 120.

The stack pipe part 110 is configured to guide the flow of the flare gas or the flare gas G so that the flare gas G rises in the vertical direction.

For example, the stack pipe part 110 is installed in a vertical direction to the structure, and has a hollow cylindrical columnar shape having a constant diameter or a tapered hollow cylindrical columnar shape whose cross section diameter decreases toward an upper portion thereof.

In addition, although not shown in the drawings, at least one ignition device for burning the flare gas is provided at the upper end of the stack tube part 110.

In addition, the upper end of the stack pipe 110 is provided with a slot 110s for communicating the inside and the outside of the stack pipe 110 and the flare gas G is discharged.

The nozzle tip 120 has a narrow upper and lower portions as shown in FIG. 4, and a jar shape or a vase shape in which a belly is full, and is spaced apart from the upper end of the stack tube part 110 by the space of the slot part 110s.

The nozzle tip part 120 has a shape in which a radius of the upper part and a lower part is relatively small and a radius of the center part is large, and the first coanda part 121 seated on the upper end of the stack tube part 110 and the first coanda part And a second coanda portion 123 extending in an upward direction, and a third coanda portion 125 extending upwardly from the second coanda portion 123.

That is, the nozzle tip part 120 may include a first coanda part 121 and a first coanda part 121 that allow the flare gas G to rise in a vertical direction and flow along the first curvature radius R1. ) And a second coanda portion 123 having a second radius of curvature R2, and a third coanda portion having a third radius of curvature R3 extending with the second coanda portion 123 ( 125) in a streamlined connection.

In particular, the nozzle tip portion 120 forms a streamline shape with the first to third radius of curvature R1, R2, R3 from the bottom to the top to allow the flare gas S to flow naturally without clogging, thereby maximizing the Coanda effect. do.

In addition, as shown in FIG. 4A, the nozzle tip 120 has a first radius of curvature R1 smaller than the second radius of curvature R2, the same as the third radius of curvature R3, and a third nose. The outer diameter d3 of the andacle portion 125 is smaller than the outer diameter d2 of the second coanda portion 123 and larger than the outer diameter d1 of the first coanda portion 121.

Therefore, the flare gas G flows outward along the surface bent by the first curvature radius R1 of the first coanda part 121 to the surface of the second curvature radius R2 of the second coanda part 123. As it is bent along the rising edge, it is bent to the third radius of curvature (R3) of the third coanda portion 125 is burned and discharged.

This is because the flare gas (G) is injected at the supersonic speed inside the stack pipe part 110, and at the outside of the stack pipe part 110, the air flows at a lower speed than the sound speed or there is a stationary state. A velocity gradient occurs between the flare gas injection air stream and the atmosphere near the flare tip. This velocity gradient is gentler due to the streamlined first to third coanda portions 121, 123, 125. As a result, noise or vibration caused by a sudden speed gradient can be alleviated.

In addition, the nozzle tip portion 120 is formed of only a continuous surface from the bottom to the top without a discontinuous surface in the side portion, so that a discontinuous surface is formed like a conventional cone shape, so that a vortex phenomenon occurs in the discontinuous surface. It is possible to solve the problem of shortening the mechanical life due to the intensification of the vibration (chattering) in the left and right or up and down directions.

In particular, the nozzle tip 120 is formed with a cross section 120g of a predetermined depth in the vertical direction of the surface to prevent vortex generation.

Here, the air flow portion 120g is to prevent the flare gas G passing through the surfaces of the second and third coanda portions 125 from contacting the atmosphere, preventing the vertical rise and disturbing the flow and generating vortices. .

That is, as shown in (b) of FIG. 4, the cross section 120g has a groove having a predetermined depth in a vertical direction in a portion where the nozzle tip 120 deviates from the stack pipe portion 110. It is formed side by side.

In addition, the nozzle tip 120 has a magnetic weight of a predetermined size or more, but a hollow hollow portion 120h is formed from the upper side to the center so that the weight does not exceed a predetermined weight, and anchor bolt fastening is illustrated in FIG. 4. It is possible to carry and transport conveniently.

On the other hand, the hollow portion (120h) is an empty space (empty space) for adjusting the weight of the nozzle tip portion 120, the shape is not limited to the cylinder can be applied in various shapes.

As such, the flare tip device 100 having the vertical cross-section according to an embodiment of the present invention can expect the following effects.

Since the present invention includes a streamlined nozzle tip portion 120, it is possible to increase the coanda effect flowing along the surface of the object without significantly changing the overall structure of the flare stack or the flare system, thereby reducing the occurrence of noise or vibration. There is this.

In addition, due to the streamlined nozzle tip part 120, the flare gas G in the stack tube part 110 may be naturally discharged to the slot part 110s, and thus combustion may be stably performed.

In addition, since the nozzle tip portion 120 includes the first to third coanda portions 121, 123, and 125, the posture is stabilized to facilitate the discharge of the flare gas G along the surface from the lower portion to the upper portion. have.

In addition, the nozzle tip 120 has an advantage that the cross-section (120g) is formed in the vertical direction on the surface to increase the discharge rate and to suppress the generation of vortex.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be.

Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. .

The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: flare tip device proposed by the present invention
110: stack pipe portion
110s: slot section
120: nozzle tip part
120h: hollow part
120g: Girobu
121: First Coandabu
123: second coanda
125: third coanda

Claims (2)

A stack tube portion which guides the flare gas so that the flare gas rises in the vertical direction;
And a nozzle tip spaced apart from the upper end of the stack pipe portion by a predetermined distance.
The nozzle tip has a narrow upper and lower abdomen and is called a jar shape, and a hollow hollow portion is formed from an upper side to a center, and an anchor bolt can be fastened therein.
A first coanda portion for allowing the flare gas to rise in a vertical direction and flow along a first radius of curvature; A second coanda portion extending from the first coanda portion and having a second radius of curvature; And a third coanda portion extending from the second coanda portion and having a third radius of curvature to form a streamline shape.
The first radius of curvature is smaller than the second radius of curvature and the same as the third radius of curvature, and the third coanda portion outer diameter is smaller than the second coanda portion outer diameter and larger than the first coanda portion outer diameter,
The flare gas flows outward along the curved surface of the first radius of curvature and is curved upward along the surface of the second radius of curvature and then burned to the third radius of curvature to be combusted. A flare tip device having a vertical cross section, wherein a cross section having a predetermined depth is formed in a vertical direction to prevent vortex generation. delete

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