Mechanical pipe flame arrestor for explosion-proof

Abstract

The application discloses a mechanical pipeline flame arrester for preventing explosion and detonation flame, which comprises a shell, a first contraction chamber, a second contraction chamber and a nested structure. The first end of the shell is an air inlet, and the second end of the shell is an air outlet. The end with a larger cross-sectional area of the first contraction chamber is connected with the inner wall of the shell, and the end with a smaller cross-sectional area of the first contraction chamber faces the air outlet. The end with a larger cross-sectional area of the second contraction chamber is connected with the inner wall of the shell, and the end with a smaller cross-sectional area of the second contraction chamber faces the air inlet. The nested structure is located between the first contraction chamber and the second contraction chamber and comprises an inner chamber and an outer chamber sleeved outside the inner chamber. Compared with the prior art, the flame arrester can reduce the influence on the normal operation of the pipeline while preventing the flame.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial flame arresters, in particular to a mechanical pipeline flame arrester for preventing explosion and flame. BACKGROUND

[0002] Traditional passive industrial flame arresters are generally composed of a shell and a filter element. The filter element of the flame arrester can divide the flame into countless small flame streams, which are quenched by heat transfer and wall effect. The commonly used filter elements are metal mesh filter elements and corrugated filter elements, but either of them will increase the resistance to forward flow in the pipeline.

[0003] Active flame arresters are generally triggered by spraying explosion suppressants or closing valves to block the flame when an explosion occurs. Once the active flame arrester is triggered, the pipeline operating conditions will inevitably be unstable. SUMMARY

[0004] The purpose of the present application is to provide a mechanical pipeline flame arrester for preventing explosion and flame, which can reduce the impact on the normal operation of the pipeline while blocking the flame.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions.

[0006] The present application discloses a mechanical pipeline flame arrester for preventing explosion and flame, comprising:

[0007] a shell, a first end of the shell being an air inlet, a second end of the shell being an air outlet;

[0008] a first contraction chamber, one end of the first contraction chamber with a larger cross-sectional area being connected to the inner wall of the shell, the other end of the first contraction chamber with a smaller cross-sectional area facing the air outlet;

[0009] a nested structure, the nested structure being located on the side of the first contraction chamber away from the air inlet; the nested structure comprising an inner chamber and an outer chamber sleeved outside the inner chamber, a gap being left between the inner chamber and the outer chamber; the inner chamber and the outer chamber are both in a contraction shape, one end of the inner chamber and one end of the outer chamber with a smaller cross-sectional area both facing the air outlet; one end of the outer chamber with a larger cross-sectional area being connected to the inner wall of the shell, one end of the inner chamber with a larger cross-sectional area leaving a gap with the shell.

[0010] Preferably, the mechanical pipeline flame arrester for preventing explosion and flame further comprises a second contraction chamber, one end of the second contraction chamber with a larger cross-sectional area being connected to the inner wall of the shell, the other end of the second contraction chamber with a smaller cross-sectional area facing the air inlet;

[0011] The nesting structure is located between the first contraction chamber and the second contraction chamber; the end of the second contraction chamber with smaller cross-sectional area is connected with the end of the outer chamber with smaller cross-sectional area in the adjacent nesting structure.

[0012] Preferably, the nesting structure comprises multiple groups, and the multiple groups of the nesting structure are distributed along the axis of the shell.

[0013] Preferably, the end of the first contraction chamber with smaller cross-sectional area extends into the end of the inner chamber with larger cross-sectional area to form an inner gap therebetween.

[0014] In addition to the outer chamber connected with the second contraction chamber, the end of the outer chamber with smaller cross-sectional area extends into the end of the inner chamber with larger cross-sectional area in the adjacent nesting structure to form an inner gap therebetween.

[0015] The gap between the inner chamber and the outer chamber in the same nesting structure is referred to as an outer gap.

[0016] Preferably, an inner fire barrier is installed at the inner gap, and an outer fire barrier is installed at the outer gap.

[0017] Preferably, the shell is cylindrical, the first contraction chamber, the second contraction chamber, the inner chamber and the outer chamber are all conical, and the shell, the first contraction chamber, the second contraction chamber, the inner chamber and the outer chamber are coaxial.

[0018] Preferably, the first contraction chamber, the second contraction chamber, the inner chamber and the outer chamber have the same taper.

[0019] Preferably, the angle between the generatrix of the inner chamber and the axis of the shell is α, and 10°≤α≤75°.

[0020] Preferably, in the longitudinal section of the nesting structure, the distance between the inner chamber and the outer chamber is d1; in the transverse section of the nesting structure, the distance between the inner chamber and the outer chamber is d2; and the inner diameter of the shell is d4; d1

[0021] Preferably, the inner diameter of the end of the inner chamber with smaller cross-sectional area is d3, and 0mm

[0022] The present application has the following technical effects relative to the prior art:

[0023] The fire arrester of the present application can consume the kinetic energy of the detonation gas, achieve the purpose of fire arrester, and thus improve the safety. The fire arrester does not need to set a valve and perform corresponding switching operation, nor does it need to spray a blast inhibitor, so the adaptability of the fire arrester is stronger, and the influence on the normal flow of the combustion-supporting gas is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 FIG. 1 is a longitudinal sectional view of a mechanical pipeline fire arrester for preventing detonation flame according to an embodiment of the present application;

[0026] The reference signs are explained as follows: 1 - second contraction chamber; 2 - outer gap; 3 - outer fire arrester fence; 4 - second detonation gas turning position; 5 - inner fire arrester fence; 6 - inner gap; 7 - inner chamber; 8 - outer shell; 9 - connecting flange. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0028] The purpose of the present application is to provide a mechanical pipeline fire arrester for preventing detonation flame, which can reduce the influence on the normal operation of the pipeline while preventing fire.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0030] REFERENCE Figure 1 The present embodiment provides a mechanical pipeline fire arrester for preventing detonation flame (hereinafter referred to as fire arrester), which comprises an outer shell 8, a first contraction chamber and a nested structure.

[0031] The first end of the shell 8 is an air inlet, and the second end of the shell 8 is an air outlet. Combustion-supporting gas flows into the shell 8 from the air inlet and flows out of the shell 8 from the air outlet. When a detonation is generated, detonation gas flows back into the shell 8 from the air outlet. The first contraction chamber is connected to the inner wall of the shell 8 at the end with a larger cross-sectional area, and the end with a smaller cross-sectional area of the first contraction chamber faces the air outlet. The nested structure is located on the side of the first contraction chamber away from the air inlet and includes an inner chamber 7 and an outer chamber 7 sleeved outside the inner chamber 7. Both the inner chamber 7 and the outer chamber are constricted, and the end with a smaller cross-sectional area of both the inner chamber 7 and the outer chamber faces the air outlet. The end with a larger cross-sectional area of the outer chamber is connected to the inner wall of the shell 8, and the end with a larger cross-sectional area of the inner chamber 7 leaves a gap with the shell 8. The inner chamber 7 can be fixed to the shell 8 by a connecting piece, or can be fixed to the outer chamber by a connecting piece, and a gap should be left between the inner chamber 7 and the outer chamber.

[0032] The working principle of the flame arrester of the embodiment is as follows:

[0033] When no detonation flame is generated, the flame arrester only plays the role of a tapered tube, and combustion-supporting gas flows into the shell 8 from the air inlet and flows out of the shell 8 from the air outlet, and the flame arrester does not add much additional axial resistance to the combustion-supporting gas.

[0034] When a detonation flame is generated, detonation gas enters the shell 8 from the air outlet, flows through the second contraction chamber 1, and reaches the nested structure. At this time, the detonation gas is divided into two parts, and the first part enters the inner chamber 7 from the end of the inner chamber 7 close to the air outlet. The second part flows through the gap between the inner chamber 7 and the outer chamber, encounters another nested structure (specifically, the outer chamber of another nested structure) or the obstruction of the first contraction chamber, and is diverted and consumes kinetic energy under the obstruction. Then, the second part of the detonation gas enters the inner chamber 7 from the end of the inner chamber 7 close to the air inlet. The two parts of detonation gas meet and form a vortex inside the inner chamber 7, and the kinetic energy of the detonation gas is consumed again. Similarly, the combustion-supporting gas flowing into the shell 8 from the air inlet also meets the detonation gas, thereby consuming the kinetic energy of the detonation gas.

[0035] In summary, the flame arrester of the embodiment can consume the kinetic energy of the detonation gas, achieve the purpose of flame arrester, and thus improve safety. The flame arrester does not need to be provided with a valve and corresponding switching operation, nor does it need to spray an explosion inhibitor, so the adaptability of the flame arrester is stronger, and the influence on the normal flow of combustion-supporting gas is smaller.

[0036] As a possible example, in this embodiment, the mechanical pipe flame arrester for preventing detonation flames further includes a second contraction chamber 1. The end of the second contraction chamber 1 with a larger cross-sectional area is connected to the inner wall of the outer casing 8, and the end of the second contraction chamber 1 with a smaller cross-sectional area faces the air inlet. A nested structure is located between the first contraction chamber and the second contraction chamber 1. The end of the second contraction chamber 1 with a smaller cross-sectional area is connected to the end of the outer chamber with a smaller cross-sectional area in the adjacent nested structure. The second contraction chamber 1 can guide the detonation gas to the center of the outer casing 8.

[0037] As one possible example, in this embodiment, the nested structure comprises multiple sets, which are spaced apart along the axis of the outer casing 8. When the detonation gas flows from the outlet to the inlet, the multiple sets of nested structures function sequentially, thereby reducing kinetic energy multiple times and improving the flame arrestor's flame-arresting capability.

[0038] As a possible example, in this embodiment, the end of the first contraction chamber with a smaller cross-sectional area extends into the end of the adjacent inner chamber 7 with a larger cross-sectional area to form an inner gap 6 between the two.

[0039] In addition to the outer chamber connecting the second contraction chamber 1 ( Figure 1 Apart from the rightmost outer chamber, the smaller cross-sectional area of ​​the remaining outer chambers extends into the larger cross-sectional area of ​​the inner chamber 7 in the adjacent nested structure to form an inner gap 6 between them.

[0040] In the same nested structure, the gap between the inner chamber 7 and the outer chamber is called the outer gap 2.

[0041] When the detonation gas flows through the nested structure, the first stream of detonation gas flows into the inner gap 6, and the second stream flows into the outer gap 2. After exiting the outer gap 2, the second stream of detonation gas, hindered by the outer chamber in another nested structure or by the first contraction chamber, enters the inner chamber 7 through the inner gap 6. At this point, the first and second streams of detonation gas converge inside the inner chamber 7. The purpose of the inner gap 6 is to guide the deflected second stream of detonation gas deeper into the inner chamber 7 to better counteract the kinetic energy of the first stream of detonation gas.

[0042] As a possible example, in this embodiment, an inner flame arrestor 5 is installed at the inner gap 6, and an outer flame arrestor 3 is installed at the outer gap 2. Both the inner flame arrestor 5 and the outer flame arrestor 3 are used to impede the flow of detonation gases in order to consume the kinetic energy of the detonation gases.

[0043] As a possible example, in the embodiment, the shell 8 is cylindrical, the first contraction chamber, the second contraction chamber 1, the inner chamber 7 and the outer chamber are all conical, and the shell 8, the first contraction chamber, the second contraction chamber 1, the inner chamber 7 and the outer chamber are coaxial. It can be understood that, in addition to the above shapes, other shapes can be selected according to actual needs by those skilled in the art. For example, the shell 8 is quadrangular prism, and the first contraction chamber, the second contraction chamber 1, the inner chamber 7 and the outer chamber are all quadrangular pyramid.

[0044] As a possible example, in the embodiment, the taper of the first contraction chamber, the second contraction chamber 1, the inner chamber 7 and the outer chamber is the same. That is, the inner gap 6 is an equal-width gap, and the outer gap 2 is also an equal-width gap.

[0045] As a possible example, in the embodiment, the angle between the generatrix of the inner chamber 7 and the axis of the shell 8 is α, and 10°≤α≤75°. In the embodiment, the thickness of the inner chamber 7 is equal everywhere, the generatrix of the inner wall and the outer wall is parallel, and therefore, no distinction is made here. Similarly, in the embodiment, the shell 8, the first contraction chamber, the second contraction chamber 1 and the outer chamber are also uniform-thickness structures with equal thickness everywhere.

[0046] As a possible example, in the embodiment, the shell 8 is provided with a connecting flange 9 at each end, so as to be fixedly connected with adjacent structures.

[0047] As a possible example, in the embodiment, the length of the shell 8 is not less than 200 mm.

[0048] As a possible example, in the embodiment, on the longitudinal section of the nested structure, the distance between the inner chamber 7 and the outer chamber is d1. On the transverse section of the nested structure, the distance between the inner chamber 7 and the outer chamber is d2. The inner diameter of the shell 8 is d4. d1

[0049] As a possible example, in the embodiment, the inner diameter of the end of the inner chamber 7 with smaller cross-sectional area is d3, and 0 mm

[0050] The principles and implementation manners of the present application are described in the specification by using specific examples, and the above description of the embodiments is only for helping to understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A mechanical pipe flame arrestor for preventing deflagration flame, characterized by, The mechanical pipeline flame arrester for preventing explosion and detonation flame comprises: a shell, a first end of the shell being an air inlet, a second end of the shell being an air outlet; a first contraction chamber, a larger cross-sectional area end of the first contraction chamber being connected with an inner wall of the shell, a smaller cross-sectional area end of the first contraction chamber being directed to the air outlet; a nested structure, the nested structure being located on a side of the first contraction chamber away from the air inlet; the nested structure comprising an inner chamber and an outer chamber sleeved outside the inner chamber, a gap being left between the inner chamber and the outer chamber; the inner chamber and the outer chamber are both in a contraction shape, smaller cross-sectional area ends of the inner chamber and the outer chamber are both directed to the air outlet; a larger cross-sectional area end of the outer chamber is connected with the inner wall of the shell, a larger cross-sectional area end of the inner chamber leaves a gap with the shell.

2. A mechanical pipe flame arrestor that prevents deflagration flames in accordance with claim 1, characterized in that, The mechanical pipeline flame arrester for preventing explosion and detonation flame further comprises a second contraction chamber, a larger cross-sectional area end of the second contraction chamber being connected with the inner wall of the shell, a smaller cross-sectional area end of the second contraction chamber being directed to the air inlet; the nested structure is located between the first contraction chamber and the second contraction chamber; the smaller cross-sectional area end of the second contraction chamber is connected with the smaller cross-sectional area end of the outer chamber in the adjacent nested structure.

3. A mechanical pipe flame arrestor that prevents deflagration flames, according to claim 2, characterized in that, The nested structure comprises multiple groups, and the multiple groups of the nested structure are distributed along an axis of the shell.

4. A mechanical pipe flame arrestor that prevents deflagration flames, according to claim 3, characterized in that, The smaller cross-sectional area end of the first contraction chamber extends into the larger cross-sectional area end of the adjacent inner chamber to form an inner gap therebetween; In addition to the outer chamber connected with the second contraction chamber, the smaller cross-sectional area end of the outer chamber extends into the larger cross-sectional area end of the inner chamber in the adjacent nested structure to form an inner gap therebetween; The gap between the inner chamber and the outer chamber in the same nested structure is referred to as an outer gap.

5. A mechanical pipe flame arrestor that prevents deflagration flames, according to claim 4, characterized in that, An inner fire barrier is installed at the inner gap, and an outer fire barrier is installed at the outer gap.

6. A mechanical pipe flame arrestor that prevents deflagration flames, according to claim 5, characterized in that, The shell is in a cylindrical shape, the first contraction chamber, the second contraction chamber, the inner chamber and the outer chamber are all in a conical shape, and the shell, the first contraction chamber, the second contraction chamber, the inner chamber and the outer chamber are coaxial.

7. A mechanical pipe flame arrestor that prevents deflagration flames, according to claim 6, characterized in that, The first contraction chamber, the second contraction chamber, the inner chamber and the outer chamber have the same taper.

8. A mechanical pipe flame arrestor that prevents deflagration flames, according to claim 7, characterized in that, An included angle between a generatrix of the inner chamber and an axis of the shell is α, and 10°≤α≤75°.

9. The mechanical pipeline flame arrester for preventing explosion and detonation flame according to claim 7, wherein In a longitudinal section of the nested structure, a distance between the inner chamber and the outer chamber is d1; in a transverse section of the nested structure, a distance between the inner chamber and the outer chamber is d2; and an inner diameter of the shell is d4; d1 10. A mechanical pipe flame arrestor that prevents deflagration flames in accordance with claim 7, characterized in that, An inner diameter of the smaller cross-sectional area end of the inner chamber is d3, and 0mm

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