KR20170065346A - Flare tip and flare apparatus including the same - Google Patents

Abstract

The present invention relates to a flare tip and a flare device including the same. Specifically, according to an embodiment of the present invention, An inlet for introducing gas into the body portion; And an outlet for discharging the gas from the body portion, wherein a noise reducing member whose sectional area decreases from the lower portion to the upper portion is provided at the end portion of the outlet.

Description

[0001] FLARE TIP AND FLARE APPARATUS INCLUDING THE SAME [0002]

The present invention relates to a flare tip and a flare device including the same.

Generally, in order to mine crude oil or gas buried in the sea floor, oil wells are installed in the oil field where crude oil or gas is buried, and on the sea of the oil field where oil wells are installed, (FPSO), and floating liquid natural gas (FLNG) offshore structures.

In the offshore structure, surplus gas such as waste gas and boil off gas (BOG) is generated during refining of drilled fuel. Such surplus gas may be re-liquefied and stored. However, considering the installation cost of the re-liquefaction equipment and the energy used for the equipment operation, it is economical to burn the surplus gas. Therefore, most of the off- And a flare device.

The flare unit includes a header line, a gas-liquid separator, a seal for preventing backfire, and a flare tip for stable combustion, collecting surplus gas generated from each equipment of the offshore structure .

The flare tip can be divided into HP tip (high pressure tip) and LP tip (low pressure tip) according to the gas injection pressure, and the subsonic tip and sonic tip (subsonic tip).

The sonic tip can inject gas at a speed higher than the sonic speed (supersonic speed of Mach 1 or more), which has the advantage that the combustion efficiency can be increased through this injection speed.

However, since the gas injection speed exceeds the sonic speed, a sudden difference in velocity occurs between the gas jet flow exceeding the sonic velocity and the atmosphere near the flare tip (air flow not reaching the sonic speed), and due to such a rapid velocity difference, . Such noise should be limited because it prevents the operator from performing the work safely.

Embodiments of the present invention have been made to solve the above-mentioned problems, and it is an object of the present invention to provide a flare tip in which the difference in speed between airflows is alleviated and noise during gas injection is reduced.

According to an aspect of the present invention, An inlet for introducing gas into the body portion; And an outlet for discharging the gas from the body portion. The flared tip may include a plurality of noise reduction members whose sectional area decreases from the lower portion toward the upper portion.

Further, the plurality of noise reduction members may be provided with flare tips having the same length.

In addition, the plurality of noise reduction members may have different lengths and may be provided with flared tips arranged in a constant pattern.

The plurality of noise reduction members may be provided with a flare tip in which a noise reduction member having a first length and a noise reduction member having a second length shorter than the first length are alternately arranged.

Further, the noise reduction member may be provided with a flared tip having a triangular plate shape.

Further, the noise reduction member may be provided with a flared tip which is bent toward the center of the flare tip.

A flare device comprising a flare tip, comprising: a flare tower including the flare tip at an upper portion thereof; A gas supply device capable of supplying gas to the flared tip; And a gas supply pipe connecting the gas supply device and the flare tip.

According to the embodiment of the present invention, the noise generated when the gas is injected at the flare tip can be further reduced.

In addition, there is an effect that the noise can be reduced through a relatively simple structure.

FIG. 1 is a conceptual diagram showing a state in which a flag device having a flag tip according to an embodiment of the present invention is installed on a marine structure.
2 is a perspective view of a flared tip according to an embodiment of the present invention.
Figure 3 is a side view showing vortex generated in the flared tip of Figure 2;
Figure 4 is a view of the flared tip of Figure 3 from AA.
5 is a side view of a flared tip according to another embodiment of the present invention.
Fig. 6 is a view of the flared tip of Fig. 5 at BB.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a conceptual diagram showing a state in which a flag device having a flag tip according to an embodiment of the present invention is installed on a marine structure.

1, a flare apparatus 2 provided on a marine structure 1 may include a header line 10, a gas-liquid separator 20, and a flare tower 30. [

The header line (10) collects gas such as waste gas and BOG generated in the sea structure. Since the gas may contain water, oil or the like, the gas-liquid separator 20 separates and discharges liquid components such as water and oil in the collected gas. Further, the gas-liquid separator 20 can precipitate the impurities contained in the gas and remove it by using a purge gas or the like. The gas passing 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 includes a flare tip 31 provided at an upper end thereof; A gas supply pipe 32 for supplying fuel to the flare tip 31; And a gas ignition device for ignition. The gas is delivered to the flare tip 31 provided at the upper end of the flare tower 30 through the gas supply pipe 32 of the flare tower 30 and is combusted while being injected from the flare tip 31. [

Hereinafter, the specific configuration of the flare tip 31 will be described with reference to Figs. 2 to 4. Fig. FIG. 2 is a perspective view of a flare tip according to an embodiment of the present invention, FIG. 3 is a side view showing a vortex generated at the flare tip of FIG. 2, and FIG. 4 is a view of the flare tip of FIG. 3 at A-A.

2 through 4, the flare tip 31 includes a body portion 100, an inlet 200, and an outlet 300. The body portion 100 may have a pipe shape. For example, the body portion 100 may have a shape in which the radii of the upper and lower portions are relatively small and the radius of the central portion is large. The inlet 200 is provided on one side of the body part 100 for supplying gas to the flare tip, for example, on the lower side of the body part 100. The outlet 300 may be provided on the other side of the body 100, for example, on the opposite side of the body 100 where the inlet is provided. At the end of the outlet 300, a noise reducing member 400 is provided.

The noise reducing member 400 may be formed extending from the end of the outlet 300 in the direction in which the gas is injected. In the noise reduction member 400, the cross section of the noise reduction member 400 decreases from the lower portion to the upper portion when the outlet 300 is referred to as the lower portion and the opposite portion thereof is referred to as the upper portion. For example, the noise reduction member 400 may be a plate having a shape such as a triangle, a trapezoid or the like when viewed from the side. In addition, the cross sectional area of the noise reducing member 400 may be reduced stepwise, that is, discontinuously, without continuously decreasing. Further, the noise reducing member 400 may be provided along the upper end of the outlet 300, and the plurality of the noise reducing members 400 may be disposed adjacent to each other, or may be disposed to have an interval therebetween have.

Further, the noise reducing member 400 may be provided so as to be inclined toward the inner direction (center direction). The inclined noise reducing member 400 prevents the gas jet stream from being excessively pushed from the inside to the outside due to the internal pressure of the flare tip 31 higher than the pressure outside the flange portion 31. [ The flared tip 31 in which the noise reducing member 400 is inclined inward can be made to have a larger width than the flared tip in which the noise reducing member 400 extends in the direction parallel to the central axis The mixing section 500 of FIG. In particular, this makes it possible to more effectively alleviate the noise caused by the rapid gradient.

Hereinafter, the action and effect of the flare tip having the above-described structure will be described. When the flare device 2 is operated to burn the gas, gas is injected from the outlet 300 of the flare tip 31 while being burned. At this time, the injection speed of the gas is supersonic at Mach 1 or more.

During gas injection, a vortex is generated along the noise reducing member 400, and by this vortex, the mixing section 500 in which the injected gas and the atmosphere near the flare tip 31 are mixed is increased. For example, the mixing section 500 may appear in the form of an airflow layer having a predetermined thickness d along the noise reduction member 400 when viewed at a predetermined height section (a cross section along AA) The thickness d of the section 500 may have a constant pattern along the noise reduction member 400 (FIG. 5).

In the mixing section 500, gas is injected at supersonic velocity, and at the outside of the mixing section 500, the air flows at a velocity lower than the sonic velocity or there is a static atmosphere. In the mixing section 500, There is a velocity gradient between the atmosphere near the tip. This velocity gradient becomes more gradual due to the increase of the mixing section 500. [ That is, the noise reducing member 400 increases the width of the mixing section 500, thereby making the velocity gradient between the airflows more gentle. In the above embodiment, the plurality of noise reduction members 400 are shown to have the same length. However, in addition to the above-described structure, According to another embodiment, the plurality of noise reduction members 400 may be provided in different lengths.

Hereinafter, another embodiment of the present invention will be described with reference to Figs. 5 and 6. Fig. Fig. 5 is a side view of a flared tip according to another embodiment of the present invention, and Fig. 6 is a view taken along the line B-B of Fig.

In explaining another embodiment of the present invention, there is a difference in that the noise reduction member 400 is provided in a different length as compared with the above-described embodiment. The difference will be mainly described, and the same description and drawings The code recites the above-described embodiments.

5 and 6, the noise reducing member 400 may be provided in plural along the upper end of the outflow port 300 and extend in the direction in which the gas is injected from the end of the outflow port 300. The noise reduction member 400 may include a first noise reduction member 410 having a first length a and a second noise reduction member 420 having a second length b, The reducing member 410 and the second noise reduction member 420 may be arranged in a predetermined pattern. For example, one first noise reduction member 410 and one second noise reduction member 420 can be alternately arranged, and one first noise reduction member 410 and two second noise reduction members 410, It is also possible that the members 420 are alternately arranged.

When a mixing section 500 is generated by alternately arranging one first noise reducing member 410 and one second noise reducing member 420, the mixing section 500 includes a first noise reducing member 410 generated by the second noise reduction member 420 and a second mixing section 520 generated by the second noise reduction member 420. The first mixing zone 510 is created by the vortex generated from the surface of the first silencer reducing member 410. The second mixing section 520 is also generated due to the vortex generated from the surface of the second noise reducing member 420 and the vortex generated from the surface of the second noise reducing member 420 is separated from the outlet end by a (Fig. 5).

The mixing section 500 is thickened at the portion where the second mixing section 520 is generated (i.e., the portion where the second noise reducing member 420 is provided) as viewed from the section of the predetermined height (section along the line B-B). In other words, the mixing section 500 has a pattern in which the thickness of the mixing section 500 changes in a wave-like shape along the noise reduction member 400 when viewed from a section of a predetermined height (section along the BB) 2 < / RTI > In the thick part of the mixing section 500, the velocity gradient between the gas jet stream and the atmosphere near the flare tip becomes more gentle, so that the noise can be further reduced.

Although the flare tip according to the embodiment of the present invention has been described above as a specific embodiment, the present invention is not limited thereto, and the present invention is not limited to this, and may be interpreted as having the widest range according to the basic idea disclosed in this specification . Skilled artisans may implement a pattern of features that are not described in a combinatorial and / or permutational manner with the disclosed embodiments, but this is not to depart from the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

1: Sea structure 2: Flare device
30: Flare Tower 31: Flare Tip
100: body part 200: inlet
300: Outlet 400: Noise reduction member
410: first noise reduction member 420: second noise reduction member
500: Mixed section

Claims (6)

A body portion;
An inlet for introducing gas into the body portion; And
And an outlet for discharging gas from the body portion,
Wherein a plurality of noise reduction members whose sectional area decreases from the lower part to the upper part are provided at the end of the outlet. The method according to claim 1,
The plurality of noise reduction members have the same length and are inclined toward the center of the body. The method according to claim 1,
Wherein the plurality of noise reduction members have different lengths and are arranged in a constant pattern. The method of claim 3,
Wherein the plurality of noise reduction members comprise:
A flare tip in which a noise reduction member having a first length and a noise reduction member having a second length shorter than the first length are alternately arranged. The method according to claim 1,
Wherein the noise reduction member has a triangular plate shape. The method according to claim 1,
Wherein the noise reduction member has a triangular plate shape.

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