A bursting disc discharge capacity testing device

Abstract

The present invention relates to the field of relief capacity testing of safety relief devices, and discloses a bursting disc relief capacity testing device. The testing device includes an inlet pipe, the end of the inlet pipe is connected to the inlet end of a voltage stabilizer, the outlet end of the voltage stabilizer is connected to an outlet pipe, and the outlet pipe is connected to a bursting disc device; the voltage stabilizer includes a stabilizing section, a honeycomb device and a damping screen are arranged in the stabilizing section, the end of the stabilizing section is a contraction section, the profile of the contraction section is a bicubic curve, and the outlet of the contraction section is connected to the outlet pipe. The present invention solves the problem of poor accuracy in relief capacity testing in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of blowdown capacity testing of safety relief devices, and more particularly to a bursting disc blowdown capacity testing device. Background Art

[0002] With the continuous development of China's industrialization process, pressure-bearing special equipment is widely used in industries such as chemical industry, petrochemical industry, oil refining, metallurgy, pharmaceutical, food, energy, and power. As a safety device on boilers, pressure vessels, and pressure pipeline systems, bursting discs are mainly used in applications with media such as high pressure, flammable, explosive, and toxic. Their operating conditions have relatively high requirements, mostly in production processes such as chemical reactions. In these production processes, sudden pressure fluctuations or intense chemical reactions during the reaction process may lead to the possibility of explosion. Due to the particularity of the media, medium leakage is not allowed in most of these production processes. In the event of an accident, to prevent overpressure of pressure-bearing equipment, it is necessary for the safety relief device to have extremely high dynamic response and a blowdown capacity greater than the safety blowdown capacity of the equipment. Therefore, the blowdown capacity of the safety relief device is a key technical parameter.

[0003] To maintain the stability of pressure in the blowdown state, traditional bursting disc blowdown capacity test devices use a tank-shaped pressure vessel as a voltage stabilizer, and the bursting pressure can be controlled at about 5%, which is difficult to meet the high-precision testing requirements for the blowdown capacity of bursting discs. To improve the control accuracy of the bursting pressure of bursting discs, a new blowdown capacity test method and device are needed to improve the accuracy of blowdown capacity testing, improve the reliability of overpressure relief devices, ensure the safe operation of pressure-bearing equipment more effectively, and effectively reduce and prevent the occurrence of explosive accidents. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a bursting disc blowdown capacity testing device.

[0005] The specific solution adopted by the present invention is as follows: A bursting disc blowdown capacity testing device, the testing device includes an inlet pipe, the end of the inlet pipe is connected to the inlet end of a voltage stabilizer, the outlet end of the voltage stabilizer is connected to an outlet pipe, and the outlet pipe is connected to a bursting disc device; the voltage stabilizer includes a stabilizing section, a honeycomb device and a damping screen are arranged in the stabilizing section, the end of the stabilizing section is a contraction section, the profile of the contraction section is a bicubic curve, and the outlet of the contraction section is connected to the outlet pipe.

[0006] The honeycomb device is composed of hexagonal honeycomb cells arranged in sequence.

[0007] Multiple layers of damping screens are arranged behind the honeycomb device.

[0008] The opening ratio of the damping screen is greater than 0.57.

[0009] The damping net has four layers, and the distance between the four damping nets is greater than 30 times the width of the mesh or greater than 500 times the diameter of the wire.

[0010] An outlet temperature sensor and an outlet pressure sensor are arranged on the outlet pipe.

[0011] A control valve is arranged at the front end of the inlet pipe.

[0012] A rectifier is arranged inside the inlet pipe, and an inlet temperature sensor, an inlet pressure sensor, and a flowmeter are arranged in sequence behind the rectifier.

[0013] The internal profile of the contraction section selects a bicubic curve, and the bicubic curve is represented by the following formula:

[0014] When , ;

[0015] When , ;

[0016] In the formula:

[0017] X—the axial distance between the front and rear connection points of the two curves, unit: m;

[0018] x—the axial distance, unit: m;

[0019] L—the overall length of the contraction section, unit: m;

[0020] D2—the radius of the outlet section of the contraction section, unit: m; D1—the radius of the inlet section of the contraction section, unit: m; D—the diameter of the section at the axial distance x, unit: m.

[0021] The present invention has the following beneficial effects compared with the prior art:

[0022] In the present invention, the rear part of the stable section is not directly connected to the bursting disc to be tested, but is connected to a contraction section with an internal profile of a bicubic curve. The bicubic curve contracts at the rear, the pressure gradient of the mainstream area is large, the boundary layer is thinner, the deflection angle of the mainstream air flow is small, the internal flow field is not easy to separate, the flow in the contraction section is approximately isentropic, and the total pressure is approximately lossless after the air flow passes through the contraction section and changes its diameter, realizing uniform outlet pressure and stable pressure under the discharge state. The control accuracy of the discharge pressure can reach within 0.3%, far better than the discharge pressure control accuracy (five percent) of the traditional discharge device (using a canned pressure vessel as a voltage stabilizer and a discharge amount testing device without a bicubic curve contraction section).

[0023] In addition, a honeycomb device is arranged in the stable section of the bursting disc discharge capacity testing device in the present invention. The honeycomb device is composed of hexagonal honeycomb cells, which guide the air flow and divide the large air flow vortices. The multi-layer damping mesh can greatly improve the axial velocity distribution uniformity, reduce its turbulence intensity, and also improve the control accuracy of the discharge pressure. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the device described in the present invention;

[0025] Figure 2 is a schematic structural diagram of the honeycomb device of the present invention.

[0026] Among them, the reference numerals are respectively:

[0027] 1 - control valve, 2 - rectifier, 3 - inlet temperature sensor, 4 - inlet pressure sensor, 5 - flowmeter, 6 - stable section, 7 - honeycomb device, 8 - damping mesh, 9 - contraction section, 10 - outlet temperature sensor, 11 - outlet pressure sensor, 12 - bursting disc device, 13 - inlet pipe, 14 - outlet pipe, 15 - voltage stabilizer. Detailed Description of the Preferred Embodiments

[0028] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0029] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Combined with the attached Figure 1-2 , a bursting disc discharge capacity testing device, the testing device includes an inlet pipe 13, the end of the inlet pipe 13 is connected to the inlet end of a voltage stabilizer 15, the outlet end of the voltage stabilizer 15 is connected to an outlet pipe 14, and the outlet pipe 14 is connected to a bursting disc device 12; the voltage stabilizer 15 includes a stable section 6, a honeycomb device 7 and a damping mesh 8 are arranged in the stable section 6, the end of the stable section 6 is a contraction section 9, the profile of the contraction section 9 is a bicubic curve, and the outlet of the contraction section 9 is connected to the outlet pipe 14.

[0031] In the present invention, the cross-sectional dimension of the stable section 6 is selected to be 8-15 times the area of the tested bursting disc, which can maintain the pressure stability in the discharge state and at the same time ensure a sufficient contraction ratio of the contraction section 9. The honeycomb device 7 is composed of hexagonal honeycomb cells arranged in sequence. A plurality of damping meshes 8 are arranged behind the honeycomb device 7. The aspect ratio of the honeycomb device 7 is usually selected to be 15-20, and the distance between opposite sides of the honeycomb device 7 is not greater than 12.7 mm.

[0032] The opening ratio of the damping mesh 8 is greater than 0.57. The number of layers of the damping mesh 8 is four, and the distance between the four layers of the damping mesh 8 is greater than 30 times the width of the mesh hole or greater than 500 times the diameter of the mesh wire. The multi-layer damping mesh 8 can greatly improve the axial velocity distribution uniformity and reduce its turbulence intensity.

[0033] An outlet temperature sensor 10 and an outlet pressure sensor 11 are arranged on the outlet pipe 14. A control valve 1 is arranged at the front end of the inlet pipe 13. A rectifier 2 is arranged inside the inlet pipe 13, and an inlet temperature sensor 3, an inlet pressure sensor 4, and a flow meter 5 are arranged in sequence behind the rectifier 2. The pressure, temperature, and flow parameters are measured by the inlet pressure sensor 4, the inlet temperature sensor 3, and the flow meter 5.

[0034] The internal profile of the contraction section 9 is selected as a bicubic curve, and the bicubic curve is expressed by the following formula:

[0035] When , ;

[0036] When , ;

[0037] In the formula: X—the axial distance between the front and rear connection points of the two curves, in m;

[0038] x—the axial distance, in m;

[0039] L—the overall length of the contraction section 9, in m;

[0040] D2—the radius of the outlet cross-section of the contraction section 9, in m;

[0041] D1—the radius of the inlet cross-section of the contraction section 9, in m; D—the diameter of the cross-section at the axial distance x, in m.

[0042] In the present invention, the flow of the gas through the contraction section 9 with a bicubic curve profile is an isentropic flow, that is, the total pressure is approximately lossless after the gas flow passes through the contraction section 9 and changes its diameter. As long as the total pressure after the stable section 6 is controlled, it can be equivalent to the pressure at the bursting disc, achieving uniform outlet pressure. The control accuracy of the relief pressure at the bursting disc (tested with a sensor having a measurement accuracy of 0.05%) is 0.24%, far superior to the relief pressure control accuracy of 5% of the traditional relief device.

[0043] The above drawings and explanations are only a specific embodiment of the present invention. However, the specific protection scope of the present invention is not limited to the above explanations. Any substitution or change made simply within the technical idea disclosed in the present invention and based on the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A bursting disc discharge capacity testing device, characterized in that, The test device includes an intake pipe (13), the end of the intake pipe (13) is connected to the inlet end of a voltage stabilizer (15), the outlet end of the voltage stabilizer (15) is connected to an outlet pipe (14), and the outlet pipe (14) is connected to a rupture disc device (12); the voltage stabilizer (15) includes a stabilizing section (6), a honeycomb device (7) and a damping screen (8) are arranged in the stabilizing section (6), the end of the stabilizing section (6) is a contraction section (9), the profile of the contraction section (9) is a bicubic curve, and the outlet of the contraction section (9) is connected to the outlet pipe (14); the honeycomb device (7) is composed of hexagonal honeycomb cells arranged in sequence; multiple layers of damping screens (8) are arranged behind the honeycomb device (7); the opening ratio of the damping screen (8) is greater than 0.57; the number of layers of the damping screen (8) is four, and the distance between the four layers of the damping screens (8) is greater than 30 times the width of the mesh holes or greater than 500 times the diameter of the wire; an outlet temperature sensor (10) and an outlet pressure sensor (11) are arranged on the outlet pipe (14), and a control valve (1) is arranged at the front end of the intake pipe (13). The internal profile of the contraction section (9) selects a bicubic curve, and the bicubic curve is expressed by the following formula: When then ; When then ; In the formula: X—the axial distance between the front and rear connection points of the two curves, unit: m; x—the axial distance, unit: m; L—the overall length of the contraction section, unit: m; D2—the radius of the outlet cross-section of the contraction section, unit: m; D1—the radius of the inlet cross-section of the contraction section, unit: m; D—the diameter of the cross-section at the axial distance x, unit: m; A flow straightener (2) is arranged inside the intake pipe (13), and an inlet temperature sensor (3), an inlet pressure sensor (4), and a flowmeter (5) are arranged in sequence behind the flow straightener (2).

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