Large-flow multi-channel flame arrester

Abstract

The flame arrester comprises an outer shell internally provided with a main cavity, an air inlet and an air outlet which are communicated with the main cavity are formed in the end portions of the left side and the right side of the outer shell respectively, and the sectional area of the main cavity is larger than the sectional area of the air inlet and the sectional area of the air outlet. A capacity expansion and speed reduction cavity, flow dividing cavities, fire retardance cavities and a collection cavity which are communicated with one another are arranged in the main cavity in the gas transmission direction, a plurality of flow dividing cavities which are arranged side by side in the vertical direction are arranged in the main cavity, the tail of each flow dividing cavity is connected with one fire retardance cavity, and water cooling cavities can be additionally arranged corresponding to the flow dividing cavities and the fire retardance cavities. Through the structural design, the flame arrester with three functions of shunting speed reduction, module flame retardance and active cooling is formed, and the flame arrester has the advantages that the flame retardance effect is excellent, the detonation wave superposition effect is avoided, high-temperature fuel gas is prevented from igniting a rear-end pipeline, and maintenance is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of combustible gas safety protection equipment, and in particular to a high-flow multi-channel flame arrester applicable to high-flow working conditions and having an active cooling function. Background Art

[0002] A flame arrester is a safety device used to prevent the spread of flames of flammable gases and flammable liquid vapors. It is generally installed in pipelines that transport flammable gases or on ventilated tanks to prevent the spread of flames (deflagration and detonation). It is usually composed of a flame arrester core, a flame arrester shell and accessories.

[0003] The existing flame arresters generally have the following technical defects: 1. Large flow bottleneck: Single-channel flame arresters above DN300 are prone to a sharp increase in pressure drop due to excessively high flow rates, and the flame barrier layer is easily blocked; the flame quenching distance is significantly extended as the pipe diameter increases, and the efficiency decreases.

[0004] 2. The manufacturing of large-sized integral flame arrester components is difficult, and the flame arresting performance is easily significantly reduced due to insufficient rigidity of the flame arrester components and uneven winding tightness of the corrugated steel belt.

[0005] 3. Insufficient heat dissipation. Traditional flame arresters have no active cooling structure, and the high temperature during deflagration can easily cause secondary ignition. Summary of the Invention

[0006] The purpose of the present invention is to provide a large-flow multi-channel flame arrester that changes the traditional design concept and has a module with triple innovations of diversion and speed reduction, modular flame arresting, and active cooling, and excellent flame arresting performance, so as to solve one or more of the problems raised in the above background technology.

[0007] To achieve the above-mentioned objectives, the present invention discloses a large-flow multi-channel flame arrester, comprising an outer shell, an air inlet and an air outlet are respectively provided at the left and right ends of the outer shell, a main cavity is provided in the outer shell, the cross-sectional area of ​​the main cavity is larger than the cross-sectional area of ​​the air inlet and the cross-sectional area of ​​the air outlet, the air inlet and the air outlet are connected to the main cavity, and an expansion and deceleration cavity, a diversion cavity, a fire arrester cavity and a collecting cavity that are interconnected are provided in the main cavity along the gas transmission direction, a plurality of diversion cavities arranged in parallel in a vertical direction are provided in the main cavity, the tail of each diversion cavity is connected to a fire arrester cavity, and a water-cooling cavity is provided on the outside of the diversion cavity and / or the fire arrester cavity.

[0008] In some embodiments, A grille is provided at the tail end of the expansion and speed reduction cavity; The sum of the effective flow areas of all diversion cavities in the main cavity is greater than or equal to 4 times the cross-sectional area of ​​the air inlet; An inspection flange connected to the fire arrester cavity is provided on the upper side of the outer shell. The inspection flange is arranged corresponding to the grid. The design of the inspection flange facilitates the inspection of the interior of the large-flow multi-channel flame arrester.

[0009] In some embodiments, The grid is a rectifying grid, the outer diameter of the grid is d, the thickness of the grid is 0.012d~0.015d, the spacing b of the grid is 0.08d~0.75d, and the width is 3b; The diversion cavity is cylindrical, and the diameter of the diversion cavity is DN150-DN250.

[0010] In some embodiments, a left baffle ring, a fire-blocking assembly, and a right baffle ring are sequentially provided in the fire-blocking cavity from left to right, wherein the fire-blocking assembly includes several layers of fire-blocking elements arranged side by side from left to right, with a gasket ring between two adjacent layers of fire-blocking elements; The left baffle ring, the fire-stop assembly and the right baffle ring are detachably connected via a connecting piece.

[0011] In some embodiments, the fire-blocking element is a disc-shaped corrugated fire-blocking element, which includes an intermediate support body and a steel belt assembly wound on the intermediate support body. The steel belt assembly adopts a sandwich stacking structure, including a first flat steel belt, a corrugated steel belt and a second flat steel belt, and the corrugated steel belt is arranged between the first flat steel belt and the second flat steel belt.

[0012] In some embodiments, the thickness of the first flat steel strip and the second flat steel strip are both 0.2 mm, the wave height of the corrugated steel strip is less than the extinction diameter MESG of the gas, and the inclination angle of the corrugated steel strip is 40-60°.

[0013] In some embodiments, the gasket includes a first wire mesh, a gasket body, and a second wire mesh, wherein the first wire mesh and the second wire mesh cover the left and right sides of the gasket body.

[0014] In some embodiments, a water cooling chamber is provided outside the diversion chamber and / or the fire arrester chamber to dissipate heat and reduce temperature.

[0015] In some embodiments, The main cavity is provided with a plurality of diverter fire-blocking cylinders arranged in parallel in the vertical direction. The diverter fire-blocking cylinder is provided with a cavity running through the left and right sides. The cavity includes a diverter cavity and a fire-blocking cavity. The diverter fire-blocking cylinders are connected by a left partition plate and a right partition plate. At the same time, the left partition plate, the right partition plate, the diverter fire-blocking cylinder and the outer shell are connected to form a water-cooling cavity surrounding the cylinder. A cooling water outlet and a cooling water inlet are respectively provided on the upper and lower sides of the outer shell, and both the cooling water outlet and the cooling water inlet are communicated with the water cooling cavity.

[0016] In some embodiments, a plurality of diverter fire-blocking cylinders are evenly distributed in the main cavity, and the cold water cavity covers these diverter fire-blocking cylinders to form a honeycomb heat dissipation grid.

[0017] In some embodiments, a flame detection sensor is added to the air inlet, and a solenoid valve is added to the cooling water inlet. The sensor can be linked to the solenoid valve. When the sensor detects a flame, the solenoid valve opens, allowing cooling water (or other cooling liquid) to flow into the water-cooling chamber for cooling and heat dissipation, thereby conserving cooling water.

[0018] Compared with the prior art, the present invention has the following beneficial effects: Reduce the flow rate, specifically by about 75%, and significantly reduce the pressure drop; Shorten the single-channel quenching distance and improve the fire-blocking reliability; Avoid the superposition effect of detonation waves in large diameter channels; The water-cooling structure design, such as the water-cooling cavity, can increase the heat absorption rate by more than 3 times. When the flame front arrives, the metal wall temperature can be less than 100°C, quickly extinguishing the flame and preventing high-temperature gas from igniting the rear-end pipeline; Modular design, single-channel flame arrester elements can be independently removed and replaced, reducing maintenance costs by 70%. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a large flow multi-channel flame arrester in some embodiments of the present invention; Figure 2 Schematic diagram of the structure of the fire arrester cavity in some embodiments of the present invention; Figure 3 Schematic diagram of the structure of the fire-blocking element in some embodiments of the present invention; Figure 4 for Figure 3 Schematic diagram of the structure of part I; Figure 5 Schematic diagram of the side structure of the gasket in some embodiments of the present invention; Figure 6 Schematic diagram of the structure of the gasket ring in some embodiments of the present invention; Figure 7 A schematic diagram of the side structure of a grille in some embodiments of the present invention; Figure 8 Schematic diagram of the structure of the grid in some embodiments of the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 The figure shows a preferred embodiment of the present invention, which discloses a high-flow multi-channel flame arrester including an outer shell 10. An air inlet 1 and an air outlet 8 are respectively provided at the left and right ends of the outer shell 10. A main chamber is provided within the outer shell 10. The cross-sectional area of ​​the main chamber is larger than that of the air inlet 1 and the air outlet 8. The air inlet 1 and the air outlet 8 are connected to the main chamber. Within the main chamber, interconnected expansion and deceleration chambers 2, diverter chambers 4, flame arrester chambers 6, and converging chambers 7 are arranged along the direction of gas transmission. A grille 14 is provided at the rear end of the expansion and deceleration chamber 2 (on the side near the air outlet 8). A water-cooling chamber 11 is provided outside the diverter chamber 4 and the flame arrester chamber 6. When the flame front enters the expansion and deceleration chamber 2, the contact area increases dramatically, and the heat loss rate exceeds the heat release rate of the chemical reaction. The generated heat is rapidly conducted away by the metal walls (outer shell 10) corresponding to the expansion and deceleration chamber 2, thereby reducing both the speed and the temperature.

[0022] The sum of the effective flow areas of all diverter cavities 4 within the main chamber can be greater than or equal to four times the cross-sectional area of ​​the air inlet 1. When the diverter cavities 4 are cylindrical, their diameter can range from DN150 to DN250. For example, using a DN300 flame arrester as an example, six diverter flame arrester cylinders with a diameter of DN250 can be installed within the outer shell 10. This reduces the flow rate within the channel to one-sixth of the original flow rate, and the effective flow area is four times the original pipe cross-sectional area.

[0023] An inspection flange 3, connected to the main chamber, can be added to the upper side of the outer shell 10. This design allows the outer shell 10 to be divided into two parts, allowing for inspection of the interior of the high-flow multi-channel flame arrester. When not required, the outer shell 10 can be secured with bolts or the like. The position of the inspection flange 3 can correspond to that of the grille 14, providing better access to the interior of the high-flow multi-channel flame arrester.

[0024] In some specific implementations, a plurality of vertically aligned diverter fire arrester cylinders are disposed within the main cavity. Each diverter fire arrester cylinder has a cavity extending left and right, including a diverter cavity 4 and a fire arrester cavity 6. The diverter fire arrester cylinders are connected by a left partition plate 13 and a right partition plate 9. The left partition plate 13, the right partition plate 9, the diverter fire arrester cylinders, and the outer shell 10 are connected to form a water-cooling cavity 11 surrounding the cylinders. The plurality of diverter fire arrester cylinders can be evenly distributed within the main cavity, with the cold water cavity 11 surrounding these diverter fire arrester cylinders to form a honeycomb-like heat dissipation grid.

[0025] In some specific implementations, the fire-blocking cavity 6 is provided with a left baffle ring 6-1, a fire-blocking assembly, and a right baffle ring 6-4 from left to right. The fire-blocking assembly may include several layers of fire-blocking elements 6-2 (e.g., 3 to 4 layers of fire-blocking elements 6-2) arranged side by side from left to right, with a gasket ring 6-3 between two adjacent layers of fire-blocking elements 6-2. The left baffle ring 6-1, the fire-blocking assembly, and the right baffle ring 6-4 can be connected and fixed by a connector (e.g., a fixing bolt 6-5, etc.) provided at the center. This design facilitates the disassembly, installation, and maintenance of these components, and also facilitates single replacement when a component needs to be replaced, thereby reducing the cost of use. Example: Combined with Figure 1 and Figure 2 As shown, the middle fire-blocking assembly may include three layers of fire-blocking elements 6 - 2 arranged side by side from left to right.

[0026] The fire-blocking element 6-2 can be a disc-shaped corrugated fire-blocking element. Figure 3 and Figure 4 As shown, the fire-blocking element 6-2 may include an intermediate support body 6-2-1 and a steel strip assembly wound on the intermediate support body. The steel strip assembly may adopt a sandwich stacked structure, including a first flat steel strip 6-2-2, a corrugated steel strip 6-2-3 and a second flat steel strip 6-2-4. The corrugated steel strip 6-2-3 is arranged between the first flat steel strip 6-2-2 and the second flat steel strip 6-2-4. The thickness of the first flat steel strip 6-2-2 and the second flat steel strip 6-2-4 may be 0.2 mm, the wave height of the corrugated steel strip 6-2-3 is less than the extinction diameter MESG of the gas (this value may be in accordance with the requirements of GB / T13347), and the inclination angle of the corrugated steel strip 6-2-3 may be 40-60° (e.g., 45°). While traditional grid flame arresters rely solely on heat conduction, the corrugated structure introduces additional forced convection. Furthermore, the wave crests and troughs form a sequence of expansion and contraction. The expansion phase slows down the flame and cools it, while the contraction phase provides secondary quenching and strengthening. Because flame propagation requires repeated breakthroughs through energy barriers, this structure prevents the flame from propagating, achieving a pulsed quenching effect. The left retaining ring 6-1, the flame arrester assembly, and the right retaining ring 6-4 are connected and secured by fixing bolts 6-5, which pass through the intermediate support 6-2-1.

[0027] Combine Figure 5 and Figure 6 As shown, the gasket 6-3 includes a first screen 6-3-1, a gasket body 6-3-2, and a second screen 6-3-3. The first screen 6-3-1 and the second screen 6-3-3 cover the left and right sides of the gasket body 6-3-2. The material of the first screen 6-3-1 and the second screen 6-3-3 is stainless steel. The mesh size of the first screen 6-3-1 and the second screen 6-3-3 can be 40 mesh, which can be adjusted as needed.

[0028] Combine Figure 7 and Figure 8 As shown, the grid 14 is a rectifying grid, the outer diameter of the grid 14 is d, the thickness of the grid 14 can be 0.012d~0.015d, the spacing b of the grid 14 can be 0.08d~0.75d, and the width can be 3b.

[0029] The outer shell 10 is provided with a cooling water outlet 5 and a cooling water inlet 12 on the upper and lower sides, respectively. Both the cooling water outlet 5 and the cooling water inlet 12 are connected to the water-cooling chamber 11, forming a flow path for cold water to flow in from the bottom and out from the top. This design also facilitates the continuous circulation of cooling water for preventative cooling. This design can help conserve cooling water. The design of the water-cooling structure, including the water-cooling chamber 11, can form a triple fire-blocking mechanism, which can specifically include: 1. Preventive cooling: The water-cooling chamber 11 is wrapped with multiple channels, which keeps the metal wall temperature below 100°C, which is much lower than the auto-ignition point of gas (methane 540°C / hydrogen 560°C); 2. Transient heat absorption: The heat of the flame front is quickly absorbed by the water cooling system, and the heat balance equation is: Q absorption > Q release; 3. Suppress re-ignition: Cool high-temperature exhaust gas to prevent unburned gas from re-igniting in the confluence cavity.

[0030] In addition, a sensor with a flame detection function can be added at the air inlet 1, and a solenoid valve can be added at the cooling water inlet 12. When the sensor detects the generation of flame, the solenoid valve is controlled to open and cooling water (or other cooling liquid) is introduced into the water cooling chamber 11 for cooling and heat dissipation.

[0031] During operation, combustible gas enters the high-flow multi-channel flame arrester through the inlet 1 and first enters the expansion and deceleration chamber 2, where its velocity is reduced. It then passes through the grille 14, transforming the turbulent flow into a forward flow, allowing the combustible gas to evenly flow into the diversion chamber 4 and then into the flame arrester chamber 6. After passing through the flame arrester chamber 6, the gas enters the converging chamber 7, where it merges and flows out through the outlet 8. During operation, when a flame is generated, cooling water can be introduced into the water-cooling chamber 11 to dissipate heat and reduce the temperature.

[0032] The above undisclosed matters can all be implemented using existing technologies and are therefore not described in detail here.

[0033] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] The above content is a further detailed description of the present invention in conjunction with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. A large flow multi-channel flame arrester, comprising an outer shell, characterized in that: An air inlet and an air outlet are respectively provided at the left and right ends of the outer shell, and a main cavity is provided in the outer shell. The cross-sectional area of ​​the main cavity is larger than the cross-sectional area of ​​the air inlet and the cross-sectional area of ​​the air outlet. The air inlet and the air outlet are connected to the main cavity. An expansion and deceleration cavity, a diversion cavity, a fire-blocking cavity and a collecting cavity that are interconnected are provided in the main cavity along the gas transmission direction. A plurality of diversion cavities arranged in parallel in the vertical direction are provided in the main cavity. The tail of each diversion cavity is connected to a fire-blocking cavity, and a water-cooling cavity is provided on the outside of the diversion cavity and / or the fire-blocking cavity.

2. A large flow multi-channel flame arrester according to claim 1, characterized in that: A grille is provided at the tail end of the expansion and speed reduction cavity; The sum of the effective flow areas of all diversion cavities in the main cavity is greater than or equal to 4 times the cross-sectional area of ​​the air inlet; An inspection flange communicating with the fire-blocking cavity is provided on the upper side of the outer shell, and the inspection flange is arranged corresponding to the grille.

3. A large flow multi-channel flame arrester according to claim 2, characterized in that: The grid is a rectifying grid, the outer diameter of the grid is d, the thickness of the grid is 0.012d~0.015d, the spacing b of the grid is 0.08d~0.75d, and the width is 3b; The diversion cavity is cylindrical, and the diameter of the diversion cavity is DN150-DN250.

4. A high flow multi-channel flame arrester according to any one of claims 1 to 3, characterized in that: The fire-blocking cavity is provided with a left baffle ring, a fire-blocking assembly, and a right baffle ring from left to right. The fire-blocking assembly includes several layers of fire-blocking elements arranged side by side from left to right, with a gasket ring between two adjacent layers of fire-blocking elements. The left baffle ring, the fire-stop assembly and the right baffle ring are detachably connected via a connecting piece.

5. A large flow multi-channel flame arrester according to claim 4, characterized in that: The fire-blocking element is a disc-shaped corrugated fire-blocking element, which includes an intermediate support body and a steel belt assembly wound on the intermediate support body. The steel belt assembly adopts a sandwich stacking structure, including a first flat steel belt, a corrugated steel belt and a second flat steel belt. The corrugated steel belt is arranged between the first flat steel belt and the second flat steel belt.

6. A large flow multi-channel flame arrester according to claim 5, characterized in that: The thickness of the first flat steel strip and the second flat steel strip are both 0.2 mm, the wave height of the corrugated steel strip is less than the extinction diameter MESG of the gas, and the inclination angle of the corrugated steel strip is 40-60°.

7. A large flow multi-channel flame arrester according to claim 4, characterized in that: The gasket comprises a first wire mesh, a gasket body and a second wire mesh, wherein the first wire mesh and the second wire mesh cover the left and right sides of the gasket body.

8. A high flow multi-channel flame arrester according to any one of claims 1 to 3, characterized in that: The main cavity is provided with a plurality of diverter fire-blocking cylinders arranged in parallel in the vertical direction. The diverter fire-blocking cylinder is provided with a cavity running through the left and right sides. The cavity includes a diverter cavity and a fire-blocking cavity. The diverter fire-blocking cylinders are connected by a left partition plate and a right partition plate. At the same time, the left partition plate, the right partition plate, the diverter fire-blocking cylinder and the outer shell are connected to form a water-cooling cavity surrounding the cylinder. A cooling water outlet and a cooling water inlet are respectively provided on the upper and lower sides of the outer shell, and both the cooling water outlet and the cooling water inlet are communicated with the water cooling cavity.

9. A large flow multi-channel flame arrester according to claim 8, characterized in that: A plurality of diversion fire-resistance cylinders are evenly arranged in the main cavity, and the cold water cavity covers these diversion fire-resistance cylinders to form a honeycomb heat dissipation grid.

10. The large flow multi-channel flame arrester according to claim 7, characterized in that: A sensor with flame detection function is added at the air inlet, and a solenoid valve is added at the cooling water inlet.

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