An efficient relief device for triggering the explosion of superheated liquid

Abstract

The present invention provides an efficient discharge device for triggering explosive boiling of superheated liquids, belonging to the technical field of explosion test equipment. The device comprises a flange connection section, a sealing section, a clamping group, and an electric heating wire loop. The flange connection section is composed of a cylindrical section and a stainless steel ring and is welded to the upper portion of a pre-set opening of a pressurized vessel. The sealing section is used to seal the flange opening. The clamping group is used to clamp the flange connection section and the sealing section to provide a seal. The electric heating wire loop comprises a remote control, a switching power supply, and a nickel-chromium alloy electric heating wire for triggering discharge. The efficient discharge device for controlling explosive boiling of superheated liquids provided by the present invention can quickly, conveniently, and safely trigger the discharge of a pressurized vessel, providing support for conducting boiling liquid extended vapor explosion experiments and having great significance for studying the mechanism of explosive boiling of pressurized vessels.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion test equipment and relates to a high-efficiency discharge device that triggers explosive boiling of superheated liquid. Background Art

[0002] A mixture of hydrocarbons is a widely used fuel in the heating and power generation industries. To expand storage and transportation capacity and reduce transportation costs, these gases are stored and transported as liquefied gas. During the processing, storage, and transportation of liquefied gas, if a tank ruptures due to physical impact from external objects, thermal radiation from surrounding heat sources, or internal corrosion, the pressure within the tank will rapidly decrease, causing the liquefied gas to overheat and violently vaporize and boil. This overpressure inside the container can cause it to rupture, ultimately leading to a boiling liquid extended vapor explosion (BLEVE). Once this occurs, it often causes serious damage and casualties.

[0003] The discharge device that triggers the explosive boiling of superheated liquid is installed on a pressurized container, such as a pre-set opening of a vertical or horizontal container for experiments, and is used to trigger the explosive boiling of superheated liquid during the explosion test. The existing discharge devices that trigger the explosive boiling of superheated liquid are relatively bulky in design, and the discharge procedure is cumbersome. There are certain risks. The discharge size cannot be controlled and changed. It cannot quickly, conveniently and safely simulate the boiling liquid expansion steam explosion scenario in real life, and the experimental cost is relatively high. Summary of the Invention

[0004] In view of the defects existing in the prior art, the object of the present invention is to provide an efficient discharge device that triggers the boiling of superheated liquid.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A high-efficiency relief device for triggering explosive boiling of superheated liquid comprises a flange connection section 1, a sealing section 2, a clamping group 3 and a heating wire loop 4.

[0007] The flange connection section 1 is welded by a cylinder section 11 and a stainless steel ring a 12. The inner diameters of both are the same as the inner diameter of the pre-set opening of the pressure vessel. The outer diameter of the stainless steel ring a 12 is larger than the outer diameter of the cylinder section 11. The two are coaxial and the stainless steel ring a 12 is located above the cylinder section 11. The bottom end of the cylinder section 11 is welded to the pre-set opening of the pressure vessel.

[0008] The sealing section 2 is used to seal the pre-set opening of the pressurized container, and includes a bottom sealing rubber ring 21, a sealing membrane 22, a stainless steel sheet 23 with a pre-made opening, an upper sealing rubber ring 24, a stainless steel ring b 25, a telescopic wire box 26 and a wire fixing position 27. The bottom sealing rubber ring 21, sealing membrane 22, stainless steel sheet 23 with prefabricated opening, upper sealing rubber ring 24 and stainless steel ring b 25 are stacked on the stainless steel ring a 12 of the flange connection section 1 from bottom to top, and are coaxial with the stainless steel ring a 12, wherein the bottom sealing rubber ring 21, the upper sealing rubber ring 24 and the stainless steel ring b 25 are all annular, and their inner and outer diameters are the same as those of the stainless steel ring a 12 of the flange connection section 1; the sealing membrane 22 is a circle with the same diameter as the outer diameter of the stainless steel ring a 12; the outer diameter of the stainless steel sheet 23 with prefabricated opening is the same as that of the stainless steel ring a 12, and the central opening serves as a discharge port, and the size of the opening is smaller than the inner circle of the stainless steel ring a 12; two telescopic wire boxes 26 are symmetrically installed on the two side walls in the diameter direction of the sealing section 2, which contain a spiral spring, which has a certain pre-tightening force on the wound wire, and the size of the pre-tightening force is adjusted by controlling the tightness of the spring; two wire fixing positions 27 are symmetrically welded to the stainless steel ring b 25 is on the outer side of the inner circle of the upper surface, and the two are on the same diameter as the two telescopic wire boxes 26.

[0009] The clamping group 3 is used to clamp the flange connection section 1 and the sealing section 2 to play a sealing role. It consists of a C-shaped clamping frame and bolts. The rotatable bolts pass through the upper plate of the C-shaped clamping frame, and the two are threadedly matched. They are clamped on the stainless steel ring a 12 of the flange connection section 1 and the sealing section 2 from the outside and are clamped and loosened by turning the bolts.

[0010] The heating wire circuit 4 comprises a remote control switch 41, a switching power supply 42, and a heating wire 43, all interconnected by wires. The remote control switch 41 and switching power supply 42 are sequentially arranged on the wire connected to the circuit power supply, then split into two paths connected to the ends of the heating wire 43 to form the heating wire circuit 4. The remote control switch 41 is used to remotely close and open the circuit, while the switching power supply 42 is used to reduce the voltage of the circuit power supply to a specified value. The wires at both ends of the heating wire 43 pass through the wire fixings 27 on either side and are then wound within the telescopic wire boxes 26 on either side, placing the heating wire 43 between the two wire fixings 27 and suspended above the discharge port, thereby rupturing the sealing membrane 22 at high temperatures. The wire preload is adjusted by controlling the tension of the spring within the telescopic wire box 26, thereby controlling the degree of pressure exerted by the heating wire 43 on the bulging sealing membrane 22.

[0011] Furthermore, the opening shape and size of the stainless steel sheet 23 with the prefabricated opening are determined as needed to control the discharge size.

[0012] Furthermore, the sealing film 22 is provided with one or more layers, and the number of layers is determined by the discharge pressure set by the pressurized container.

[0013] Furthermore, the clamping groups 3 are provided in one group or multiple groups with the same structure. When multiple groups are provided, they are in an even number, with two clamping groups 3 forming a pair. The two clamping groups 3 in each pair are used symmetrically along the diameter direction.

[0014] Furthermore, in the heating wire loop 4, the power of the switching power supply 42 is 12V 29A 348W, which can convert 220V AC power into 12V DC power, and the diameter of the heating wire 43 is 0.35mm.

[0015] Furthermore, the sealing film 22 is made of polytetrafluoroethylene, the heating wire 43 is made of nickel-chromium alloy, and the other metal parts of the high-efficiency discharge device are made of Q306 stainless steel.

[0016] A process for using a high-efficiency relief device for triggering the explosion of superheated liquid, comprising the following steps:

[0017] Stack the bottom sealing rubber ring 21, sealing membrane 22, pre-opened stainless steel sheet 23, top sealing rubber ring 24, and stainless steel ring b 25 in order from bottom to top, coaxially with stainless steel ring a 12 on flange connection section 1. Set the number of clamping groups 3 based on the diameter of stainless steel ring a 12, using these clamping groups 3 to symmetrically clamp flange connection section 1 and sealing section 2 on the same diameter. The remote control switch 41 and the switching power supply 42 are connected in sequence through wires, and then connected to the two ends of the heating wire 43 in two ways. The wires at both ends of the heating wire 43 pass through the wire fixing positions 27 on both sides and are wrapped in the telescopic wire boxes 26 on both sides. The heating wire 43 is placed between the two wire fixing positions 27 and suspended above the discharge port for high-temperature cutting of the sealing membrane 22. The spiral spring inside the telescopic wire box 26 can be adjusted to a suitable tightness. If it is too tight, the heating wire 43 is easy to collapse. If it is too loose, the heating wire 43 and the compressed and expanded sealing membrane 22 are not tightly attached, and the heating wire 43 cannot heat open the sealing membrane 22 after power is turned on.

[0018] When the pressure in the pressurized container increases, the sealing membrane 22 expands under pressure, causing the heating wire 43 to adhere to the sealing membrane 22. At this time, the wire fixing portion 27 fixes the wire and the heating wire 43 so that they do not move. When the pressure and temperature in the pressurized container reach predetermined conditions, the remote control circuit is connected via the remote control switch 41. The heating wire 43 is energized and instantly generates high temperature, which ruptures the sealing membrane 22, allowing the high-temperature and high-pressure liquid in the pressurized container to be released.

[0019] The beneficial effects of the present invention are as follows: the present invention provides an efficient discharge device for triggering the explosive boiling of superheated liquids, which seals a pressurized container through a sealing section, and a clamping group is provided for fixing the connecting section and the sealing section. The discharge conditions are precisely controlled through an electric heating wire loop. The device is lightweight and quick to install, and the discharge size can be precisely controlled and changed. At the same time, remote control discharge has no safety risks, and can provide strong support for the efficient implementation of superheated liquid explosive boiling experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1a It is a structural schematic diagram of the high-efficiency discharge device provided by the present invention.

[0021] Figure 1b It is a schematic diagram of the structure of the clamping group in Example 1.

[0022] Figure 2 This is a schematic diagram of the heating wire circuit connection.

[0023] Figure 3 It is a top view of the high-efficiency discharge device provided by the present invention.

[0024] Figure 4a It is an AA cross-sectional view of the present invention.

[0025] Figure 4b It is a partially enlarged cross-sectional view of the sequentially stacked structure of the present invention.

[0026] Figure 5 It is a circuit diagram of the heating wire loop in the present invention.

[0027] Figure 6 It is an overall schematic diagram of the clamping group after clamping in Example 1.

[0028] In the figure: 1 flange connection section; 2 sealing section; 3 clamping group; 4 heating wire loop; 11 cylinder section; 12 stainless steel ring a; 21 bottom sealing rubber ring; 22 sealing membrane; 23 stainless steel sheet with prefabricated opening; 24 upper sealing rubber ring; 25 stainless steel ring b; 26 telescopic wire box; 27 wire fixing position; 41 remote control switch; 42 switching power supply; 43 heating wire. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0030] Example 1

[0031] As shown in Figures 1 to 4, an efficient relief device for triggering explosive boiling of superheated liquid includes a flange connection section 1, a sealing section 2, a clamping group 3 and a heating wire loop 4. The flange connection section 1 is welded to a preset opening of a pressurized container, the sealing section 2 is used to seal the preset opening of the pressurized container, the clamping group 3 is used to clamp the flange connection section 1 and the sealing section 2 to perform a sealing function, and the heating wire loop 4 is used to generate high temperature when energized to cut the sealing membrane.

[0032] The flange connection section 1 includes a cylinder section 11 and a stainless steel ring a 12. The inner diameters of the two are the same and equal to the size of the preset opening of the pressure vessel. The outer diameter of the stainless steel ring a 12 is larger than the outer diameter of the cylinder section 11. The stainless steel ring a 12 is located above the cylinder section 11, and the two are welded and fixed to each other. The bottom end of the cylinder section 11 is welded to the preset opening of the pressure vessel.

[0033] The sealing section 2 includes a bottom sealing rubber ring 21, a sealing membrane 22, a stainless steel sheet with a prefabricated opening 23, an upper sealing rubber ring 24, a stainless steel ring b 25, a telescopic wire box 26, and a wire fixing position 27. The bottom sealing rubber ring 21, the sealing membrane 22, the stainless steel sheet with a prefabricated opening 23, the upper sealing rubber ring 24, and the stainless steel ring b 25 are stacked on the stainless steel ring a 12 from bottom to top and are coaxial to ensure a good sealing effect of the sealing section, such as Figure 4a and Figure 4b As shown, the bottom sealing rubber ring 21, the upper sealing rubber ring 24 and the stainless steel ring b 25 are all annular, and their inner and outer diameters are the same as those of the stainless steel ring a 12. The sealing membrane 22 is a circle with the same diameter as the stainless steel ring a 12. The outer diameter of the prefabricated opening stainless steel sheet 23 is the same as that of the stainless steel ring a 12, and the square opening in the middle serves as a discharge port, and the side length of the square opening is smaller than the inner circle of the stainless steel ring a 12; two telescopic wire boxes 26 are symmetrically fixed on the two side walls in the diameter direction of the sealing section 2, which contain a spiral spring, which has a certain pre-tightening force on the wound wire, and the size of the pre-tightening force is adjusted by controlling the tension of the spring; two wire fixing positions 27 are symmetrically welded to the outer side of the inner circle of the upper surface of the stainless steel ring b 25, and both are on the same diameter as the two telescopic wire boxes 26, and are used to fix the wires connecting the heating wire 43 in the heating wire loop 4, so that the heating wire 43 is close to the bulging sealing membrane.

[0034] The clamping group 3 is a C-shaped clamping structure, including a C-shaped clamping frame and a bolt. The rotatable bolt passes through the upper plate of the C-shaped clamping frame, and the two are threaded together to clamp the clamping group 3 from the outside to the edge of the assembled flange connection section 1 and the sealing section 2, and the clamping force is controlled by turning the bolt. In this embodiment, the clamping group 3 is provided with 4 groups (such as Figure 6 As shown), the two clamping groups 3 are arranged in pairs, and the two unpaired clamping groups 3 are symmetrically arranged along the diameter direction to achieve the best sealing effect.

[0035] The heating wire circuit 4 includes a remote control switch 41, a switching power supply 42 and a heating wire 43, which are connected by wires. The circuit connection is as follows: Figure 2 and Figure 5 As shown. A remote control switch 41 and a switching power supply 42 are sequentially arranged on the wire connected to the circuit power supply. The wire then splits into two paths, communicating with two wire fixtures 27 and connecting to both ends of a heating wire 43 to form a heating wire loop 4. The heating wire 43 is positioned between the two wire fixtures 27. The remote control 41 is used to remotely close and open the circuit, while the switching power supply 42 is used to reduce the circuit power supply voltage to a specified value. The heating wire 43 is suspended above the vent, enabling high-temperature rupture of the sealing membrane 22. The wires connecting the two ends of the heating wire 43 pass through the wire fixtures 27 on either side and are then wound within the telescopic wire boxes 26 on either side. By adjusting the spiral springs within the telescopic wire boxes 26 to the appropriate tension, the heating wire 43 can be kept in close contact with the sealing membrane 22 when it expands under pressure. The resistance of the heating wire 43 can be calculated from its thickness and length, and the circuit current can be calculated from the resistance and voltage. Note that the current must not exceed the rated current of the switching power supply. In this embodiment, the heating wire 43 has a diameter of 0.35 mm, and the power of the switching power supply 42 is 12V 29A 348W, which can convert 220V AC power into 12V DC power.

[0036] The flange connection section 1, the prefabricated opening stainless steel sheet 23, the stainless steel ring b 25 and the wire fixing position 26 are all made of Q306 stainless steel, the bottom sealing rubber ring 21 and the upper sealing rubber ring 24 are both made of silicone rubber sealing gaskets, the sealing membrane 22 is made of polytetrafluoroethylene film, and the heating wire 43 is made of nickel-chromium alloy electric heating wire. The use of Q306 stainless steel has better corrosion resistance and heat resistance, the use of silicone rubber sealing gaskets has outstanding high and low temperature resistance and aging resistance, the use of polytetrafluoroethylene film has excellent high temperature resistance and tensile strength, and the use of nickel-chromium alloy electric heating wire has the advantages of high strength, good plasticity and fast heating.

[0037] In this embodiment, the sealing film 22 is provided with two layers. The pressure that the pressurized container can withstand is calculated as 0.3 MPa based on the number of layers of the sealing film 22, and can withstand the set discharge pressure.

[0038] In this embodiment, the medium stored in the pressurized container is water.

[0039] This embodiment provides a highly efficient discharge device that triggers explosive boiling of superheated liquid. When the pressure in the pressurized container increases, the sealing membrane 22 expands due to the heat, causing the heating wire 43 to adhere closely to the sealing membrane 22. At this time, the wire fixing position 27 fixes the wire so that it does not shift. When the pressure and temperature in the pressurized container reach 220 kPa and 125°C, the remote control circuit is connected via the remote control switch 41. The heating wire 43 is energized and instantly generates high temperature, which ruptures the sealing membrane 22, allowing the water in the pressurized container to be discharged.

[0040] The above-described embodiments merely express the implementation methods of the present invention, but should not be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. An efficient discharge device for triggering the boiling of superheated liquid, characterized in that: The high-efficiency discharge device comprises a flange connection section (1), a sealing section (2), a clamping group (3) and a heating wire loop (4); The flange connection section (1) is formed by fixing a cylinder section (11) and a stainless steel ring a (12), the inner diameters of which are the same as the inner diameter of the pre-set opening of the pressure vessel, the outer diameter of the stainless steel ring a (12) is larger than the outer diameter of the cylinder section (11), the two are coaxial, and the stainless steel ring a (12) is located above the cylinder section (11), and the bottom end of the cylinder section (11) is fixed to the pre-set opening of the pressure vessel; The sealing section (2) is used to seal the pre-set opening of the pressure container, and includes a bottom sealing rubber ring (21), a sealing membrane (22), a stainless steel sheet with a pre-made opening (23), an upper sealing rubber ring (24), a stainless steel ring b (25), a telescopic wire box (26) and a wire fixing position (27); the bottom sealing rubber ring (21), the sealing membrane (22), the stainless steel sheet with a pre-made opening (23), the upper sealing rubber ring (24) and the stainless steel ring b (25) are sequentially stacked on the stainless steel ring a (12) of the flange connection section (1) from bottom to top, and are coaxial with the stainless steel ring a (12), wherein the bottom sealing rubber ring (21), the upper sealing rubber ring ( 24) and the stainless steel ring b (25) are both annular, and their inner and outer diameters are the same as those of the stainless steel ring a (12) of the flange connection section (1); the sealing membrane (22) is a circle with the same diameter as the outer diameter of the stainless steel ring a (12); the outer diameter of the stainless steel sheet (23) with a prefabricated opening is the same as the outer diameter of the stainless steel ring a (12), and the central opening is used as a discharge port, and the size of the opening is smaller than the inner circle of the stainless steel ring a (12); two telescopic wire boxes (26) are symmetrically installed on the two side walls of the sealing section (2) in the diameter direction; two wire fixing positions (27) are symmetrically welded to the outer side of the inner circle of the upper surface of the stainless steel ring b (25), and the two are on the same diameter as the two telescopic wire boxes (26); The clamping group (3) is used to clamp the flange connection section (1) and the sealing section (2) to perform a sealing function; The heating wire loop (4) includes a remote control switch (41), a switching power supply (42) and a heating wire (43), which are connected through a wire; after the remote control switch (41) and the switching power supply (42) are arranged in sequence on the wire connected to the circuit power supply, it is divided into two paths and connected to the two ends of the heating wire (43) to form the heating wire loop (4); the wires at both ends of the heating wire (43) pass through the wire fixing positions (27) on both sides respectively, and are wound in the telescopic wire boxes (26) on both sides, so that the heating wire (43) is placed between the two wire fixing positions (27) and suspended above the discharge port for high-temperature cutting of the sealing film (22).

2. The high-efficiency discharge device for triggering the explosive boiling of superheated liquid according to claim 1, characterized in that: The shape and size of the opening of the stainless steel sheet (23) with the prefabricated opening are determined according to needs to control the discharge size.

3. The high-efficiency discharge device for triggering the explosive boiling of superheated liquid according to claim 1, characterized in that: The sealing film (22) is provided with one or more layers, and the number of layers is determined by the discharge pressure set by the pressurized container.

4. The high-efficiency discharge device for triggering the explosive boiling of superheated liquid according to claim 1, characterized in that: The two telescopic wire boxes (26) contain springs for winding the wires. The wire preload is adjusted by controlling the tightness of the springs, thereby controlling the degree of compression of the heating wire (43) on the pressurized and bulging sealing membrane (22).

5. The high-efficiency discharge device for triggering the explosive boiling of superheated liquid according to claim 1, characterized in that: The clamping group (3) is composed of a C-shaped clamping frame and bolts. The bolts pass through the upper plate of the C-shaped clamping frame, and the two are threadedly matched to clamp the stainless steel ring a (12) of the flange connection section (1) and the sealing section (2) from the outside.

6. A high-efficiency discharge device for triggering the explosion of superheated liquid according to claim 1 or 3, characterized in that: The clamping groups (3) are provided in one group or multiple groups with the same structure. When multiple groups are provided, they are in an even number, with two clamping groups forming a pair. The two clamping groups (3) in each pair are used symmetrically along the diameter direction.

7. The high-efficiency discharge device for triggering the explosive boiling of superheated liquid according to claim 1, characterized in that: In the heating wire circuit (4), the switching power supply (42) can convert 220V AC power into 12V DC power.

8. The high-efficiency discharge device for triggering the explosive boiling of superheated liquid according to claim 1 or 3, characterized in that: The sealing film (22) is made of polytetrafluoroethylene, the heating wire (43) is made of nickel-chromium alloy, and the other metal parts of the high-efficiency discharge device are all made of Q306 stainless steel.

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