Test method, test system and explosion venting device

Abstract

This disclosure provides a testing method, testing system, and explosion venting device. The testing method includes: determining an explosion venting pressure ratio assessment value for a first container based on the turning angle and length-to-diameter ratio of the explosion venting conduit; and determining whether the explosion venting conduit meets the explosion venting requirements of the first container based on the explosion venting pressure ratio assessment value and a pre-obtained upper limit for the explosion venting pressure ratio of the first container; wherein the upper limit for the explosion venting pressure ratio of the first container is the ratio between the maximum explosion venting pressure of the first container with the conduit and the maximum explosion venting pressure without the conduit. This disclosure can effectively evaluate the performance of the explosion venting device based on the parameters of the explosion venting conduit.

Description

Technical Field

[0001] This disclosure relates to a test method, test system, and explosion venting device. Background Technology

[0002] In recent years, dust explosions have occurred frequently, causing numerous casualties and property losses. Explosion venting technology is crucial in dust explosion hazard control measures. Dust explosions typically occur in a closed primary container containing a high concentration of combustible dust clouds.

[0003] The explosion relief principle of the explosion relief conduit is as follows: the explosion relief conduit is installed on the explosion relief port set on the surface of the first container. The shock wave and flame generated by the explosion in the first container are discharged from the explosion relief port and propagated along the explosion relief conduit, so that the shock wave and high temperature flame generated by the explosion in the first container are far away from personnel and equipment.

[0004] In confined production workshops, straight-tube explosion venting ducts are insufficient to meet explosion venting safety requirements. Therefore, it is necessary to add bends to the explosion venting ducts. By bends at specific angles and distances, explosion hazards can be more accurately avoided from surrounding personnel and equipment, effectively reducing the risk of explosion while ensuring venting performance. However, currently, no technology has been found to effectively assess the explosion venting performance of bends in explosion venting ducts. Summary of the Invention

[0005] To address at least one of the aforementioned technical problems, this disclosure provides a testing method, testing system, and explosion venting device that can accurately evaluate the explosion venting performance of an explosion venting duct with a bend structure, thereby improving the explosion venting performance of the duct while reducing the explosion hazard.

[0006] The first aspect of this disclosure provides a test method for an explosion venting device, the explosion venting device comprising a first container and an explosion venting conduit mounted on the first container, the explosion venting conduit having a bend structure;

[0007] The testing method for the explosion relief device includes:

[0008] The explosion relief pressure ratio evaluation value of the first container is determined based on the turning angle and the length-to-diameter ratio of the explosion relief conduit.

[0009] Based on the explosion relief pressure ratio assessment value of the first container and the pre-obtained upper limit of the explosion relief pressure ratio of the first container, determine whether the explosion relief conduit meets the explosion relief requirements of the first container;

[0010] The upper limit of the explosion relief pressure ratio of the first container is the ratio between the maximum explosion relief pressure of the first container with a conduit and the maximum explosion relief pressure without a conduit.

[0011] In some embodiments, determining whether the explosion relief conduit meets the explosion relief requirements of the first container based on the explosion relief pressure ratio assessment value of the first container and a pre-obtained upper limit for the explosion relief pressure ratio of the first container includes:

[0012] When the explosion relief pressure ratio evaluation value is less than or equal to the upper limit of the explosion relief pressure ratio, a first test result is obtained, and the first test result indicates that the explosion relief conduit meets the explosion relief requirements of the first container;

[0013] When the explosion relief pressure ratio assessment value is greater than the upper limit of the explosion relief pressure ratio, a second test result is obtained, and the second test result indicates that the explosion relief conduit does not meet the explosion relief requirements of the first container.

[0014] In some embodiments, determining the upper limit assessment value of the explosion relief pressure ratio of the first container based on the turning angle and the length-to-diameter ratio of the explosion relief conduit includes:

[0015] The explosion relief pressure ratio evaluation value of the first container is determined based on the turning angle and the length-to-diameter ratio of the explosion relief conduit, as well as a predetermined first function and a first coefficient corresponding to the first container; wherein, the first function is a predefined linear function with the turning angle and the length-to-diameter ratio as variables.

[0016] In some embodiments, the first function is represented as follows:

[0017] P = A*α + B*θ + C

[0018] Wherein, P is the explosion relief pressure ratio evaluation value of the first container, α is the turning angle of the explosion relief conduit, θ is the turning length-to-diameter ratio of the explosion relief conduit, and A, B, and C are the first coefficients corresponding to the first container.

[0019] In some embodiments, the first coefficient corresponding to the first container is obtained by detecting the maximum explosion relief pressure of the first container without a conduit and the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected, wherein the turning angles and / or turning length-to-diameter ratios of the N different explosion relief conduits are different; based on the maximum explosion relief pressure of the first container without a conduit, the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected, and the turning angles and turning length-to-diameter ratios of each of the N different explosion relief conduits, the first coefficient corresponding to the first container is determined; wherein N is an integer greater than or equal to 1, and the value of N depends on the number of the first coefficients.

[0020] In some embodiments, the maximum pressure relief without a conduit and / or the maximum pressure relief with a conduit is detected in the following manner:

[0021] The dust spraying device is controlled to spray a fixed amount of combustible powder into the first container to form a dust cloud of a specific concentration in the first container;

[0022] The detonation device is controlled to ignite the dust cloud in the first container to trigger an explosion;

[0023] The control pressure sensor monitors the transient pressure relief data inside the first container in real time during the explosion.

[0024] Based on the transient pressure data inside the first container during the explosion, the maximum pressure of the first container under the current pressure relief conditions was determined.

[0025] A second aspect of this disclosure provides a test system for an explosion relief device, comprising: an evaluation device;

[0026] The evaluation device is used to determine the explosion relief pressure ratio evaluation value of the first container using the turning angle and the turning length-to-diameter ratio of the explosion relief conduit, and to determine whether the explosion relief conduit meets the explosion relief requirements of the first container based on the explosion relief pressure ratio evaluation value of the first container and the pre-detected upper limit of the explosion relief pressure ratio of the first container.

[0027] The upper limit of the explosion relief pressure ratio of the first container is the ratio between the maximum explosion relief pressure of the first container with a conduit and the maximum explosion relief pressure without a conduit.

[0028] In some embodiments, the evaluation device is specifically used to determine the explosion relief pressure ratio evaluation value of the first container based on the turning angle and the turning length-to-diameter ratio of the explosion relief conduit, as well as a predetermined first function and a first coefficient corresponding to the first container; wherein, the first function is a predefined linear function with the turning angle and the turning length-to-diameter ratio as variables.

[0029] In some embodiments, the testing system for the explosion relief device further includes:

[0030] A dust spraying device is used to spray a fixed amount of combustible powder into a first container under the control of an automatic control and data acquisition device for explosion venting conduit, so as to form a dust cloud of a specific concentration in the first container.

[0031] An ignition device is used to ignite the dust cloud in the first container to trigger an explosion under the control of the automatic control and data acquisition device for the explosion venting conduit.

[0032] Pressure sensor is used to detect the transient pressure relief inside the first container during each explosion in real time and provide it to the automatic control and data acquisition device for the explosion relief duct.

[0033] An automatic control and data acquisition device is used to determine the maximum explosion relief pressure of the first container under corresponding explosion relief conditions based on the transient explosion relief pressure data inside the first container during each explosion, so as to detect the maximum explosion relief pressure of the first container with a conduit and the maximum explosion relief pressure without a conduit, and obtain the upper limit of the explosion relief pressure ratio of the first container.

[0034] A third aspect of this disclosure provides an explosion venting device, comprising: a first container and an explosion venting conduit connected to an explosion venting port of the first container, the explosion venting conduit having a bend structure, the bend angle and the bend length-to-diameter ratio of the explosion venting conduit being determined according to a predetermined first function and a first coefficient corresponding to the first container.

[0035] This disclosure allows for a rapid and accurate assessment of the explosion venting performance of existing explosion venting devices by utilizing parameters such as the turning angle and length-to-diameter ratio of existing explosion venting conduits. Furthermore, during the explosion venting conduit design phase, given a clear upper limit for the explosion venting pressure ratio, the optimized design of the proposed explosion venting conduit can be achieved by adjusting parameters such as the turning angle and length-to-diameter ratio. Attached Figure Description

[0036] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0037] Figure 1 This is a flowchart illustrating a test method for an explosion relief device according to some embodiments of this disclosure.

[0038] Figure 2 This is a structural block diagram of a test system for an explosion venting device according to some embodiments of the present disclosure.

[0039] Figure 3 This is a schematic diagram of the test system and the structure and connection relationship of the explosion venting device according to some embodiments of the present disclosure.

[0040] Explanation of reference numerals in the attached figures

[0041] 100 Explosion relief device

[0042] 110 First Container

[0043] 111 Explosion vent

[0044] 112 Top Cover

[0045] 120 Explosion Relief Conduit

[0046] 130 Leaked Explosion Piece

[0047] 200 Test system for explosion relief devices

[0048] 210 Evaluation Device

[0049] 220 Dust Spraying Device

[0050] 221 Pneumatic Valve

[0051] 222 Dust Container

[0052] 223 First Valve

[0053] 224 Compressed Air Cylinder

[0054] 225 Dust Diffuser

[0055] 230 Detonation Device

[0056] 231 Ignition Electrode

[0057] 232 Chemical Ignition Head

[0058] 240 Pressure Sensor

[0059] 250 Automatic Control and Data Acquisition Device

[0060] 260 Vacuum device

[0061] 261 Vacuum Pump

[0062] 262 Second Valve Detailed Implementation

[0063] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.

[0064] It should be noted that, where there is no conflict, the embodiments and features described in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0065] Unless otherwise stated, the exemplary implementations / embodiments shown are to be understood as providing exemplary features of various details that provide ways in which the technical concepts of this disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of various implementations / embodiments may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of this disclosure.

[0066] The use of crosshairs and / or shading in the accompanying drawings is generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for the specific material, material properties, dimensions, proportions, commonalities between the illustrated components, or any other characteristics, properties, etc., of the components. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0067] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.

[0068] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” another component or feature would subsequently be positioned “above” said other component or feature. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0069] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0070] The specific embodiments of this disclosure are described in detail below with reference to the accompanying drawings.

[0071] Figure 1 A schematic flowchart illustrating a test method for an explosion venting device according to some embodiments of this disclosure is shown. The test method of this disclosure is applicable to any type of explosion venting device that includes an explosion venting conduit employing a bend in its structure.

[0072] For example, see the following text. Figure 3 As shown, the explosion venting device 100 to which the test method of this disclosure applies may include a first container 110 and an explosion venting conduit 120 installed on the first container, the explosion venting conduit having a bend structure. For example... Figure 3 As shown, the first container 110 may have an explosion vent, and the explosion vent conduit 120 is fixed to the explosion vent of the first container 110.

[0073] In specific applications, this disclosure does not impose any restrictions on the type, shape, or capacity of the first container 110. For example, as Figure 3 As shown, the first container 110 can be a spherical tank with a volume of 1 cubic meter.

[0074] It should be noted that this disclosure can also be applied to other explosion venting devices, for testing and evaluating the explosion venting performance of explosion venting ducts with bend structures. This disclosure does not limit the specific structure or type of explosion venting device.

[0075] like Figure 1 As shown, in some embodiments of this disclosure, the testing method for the explosion venting device may include the following steps:

[0076] S12, Determine the explosion relief pressure ratio assessment value of the first container based on the turning angle and the length-to-diameter ratio of the explosion relief conduit;

[0077] The length-to-diameter ratio of the venting conduit at its bend can be obtained by dividing the distance from the bend point of the conduit to the venting outlet by the inner diameter of the conduit.

[0078] For example, the turning angle of the explosion relief duct, the distance from the turning point of the duct to the explosion relief port, and the inner diameter of the duct can be manually measured and these parameters can be input into the test system 200 of the explosion relief device so that the test system 200 of the explosion relief device can obtain the turning angle and the length-to-diameter ratio of the explosion relief duct.

[0079] For example, the test system 200 for the explosion venting device can obtain the geometric parameters of the explosion venting conduit from a memory or the cloud, and obtain the turning angle and length-to-diameter ratio of the explosion venting conduit based on these geometric parameters. For example, the geometric parameters of the explosion venting device may include, but are not limited to, the turning angle of the explosion venting conduit, the distance from the conduit turning point to the explosion vent, and the inner diameter of the conduit.

[0080] S14. Based on the explosion relief pressure ratio assessment value of the first container and the pre-obtained upper limit of the explosion relief pressure ratio of the first container, determine whether the explosion relief conduit meets the explosion relief requirements of the first container.

[0081] The upper limit of the explosion relief pressure ratio of the first container is the ratio between the maximum explosion relief pressure of the first container with a conduit and the maximum explosion relief pressure without a conduit.

[0082] In some implementations, the maximum explosion relief pressure of the first container with and without conduit can be obtained experimentally and recorded in advance.

[0083] In some implementations, step S14 may include: obtaining a first test result when the explosion relief pressure ratio assessment value is less than or equal to the upper limit of the explosion relief pressure ratio, the first test result indicating that the explosion relief conduit meets the explosion relief requirements of the first container; obtaining a second test result when the explosion relief pressure ratio assessment value is greater than the upper limit of the explosion relief pressure ratio, the second test result indicating that the explosion relief conduit does not meet the explosion relief requirements of the first container. This allows for convenient and intuitive provision of clear explosion relief device test results to personnel, facilitating a quick understanding of the explosion relief performance of the device.

[0084] In some implementations, step S14 may include: determining the explosion relief pressure ratio evaluation value of the first container based on the turning angle and turning length-to-diameter ratio of the explosion relief conduit, as well as a predetermined first function and a first coefficient corresponding to the first container; wherein the first function may be a predefined linear function with the turning angle and turning length-to-diameter ratio as variables.

[0085] In some implementations, the first function can be expressed as shown in equation (1):

[0086] P=A*α+B*θ+C (1)

[0087] Where P is the explosion relief pressure ratio assessment value of the first container, α is the turning angle of the explosion relief duct, θ is the turning length-to-diameter ratio of the explosion relief duct, and A, B and C are the first coefficients corresponding to the first container.

[0088] In some embodiments, the first coefficient corresponding to the first container can be obtained by detecting the maximum explosion relief pressure of the first container without a conduit and the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected; and determining the first coefficient corresponding to the first container based on the maximum explosion relief pressure of the first container without a conduit, the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected, and the turning angle and turning length-to-diameter ratio of each of the N different explosion relief conduits.

[0089] Among them, the turning angles and / or turning length-to-diameter ratios of the N different explosion relief conduits are different. N can be an integer greater than or equal to 1, and the value of N depends on the number of the first coefficient. Taking equation (1) as an example, the first coefficient includes three coefficients A, B and C, that is, the number of the first coefficient is 3. Then, the value of N can be an integer greater than or equal to 3.

[0090] In some embodiments, the maximum explosion relief pressure without a conduit and / or the maximum explosion relief pressure with a conduit can be obtained by the following methods: First, controlling a dust spraying device to spray a fixed amount of combustible dust into the first container to form a dust cloud of a specific concentration in the first container; second, controlling an ignition device to ignite the dust cloud in the first container to trigger an explosion; third, controlling a pressure sensor to detect the transient explosion relief pressure data inside the first container in real time during the explosion; and finally, determining the maximum explosion relief pressure of the first container under the current explosion relief conditions based on the transient explosion relief pressure data inside the first container during the explosion.

[0091] The current explosion venting conditions can be, but are not limited to, one of the following: no explosion venting conduit connected, or each of N different explosion venting conduits connected separately. In this way, the maximum explosion venting pressure of the first container without a conduit and the maximum explosion venting pressure with a conduit when N different explosion venting conduits are connected can be easily detected.

[0092] The specific concentration of the dust cloud in the first container refers to the dust cloud concentration corresponding to the maximum explosion pressure in the first container without a venting conduit. In some embodiments, the specific concentration of the dust cloud in the first container can be determined without an explosion venting conduit. Different types of combustible dust correspond to different specific dust cloud concentrations.

[0093] For example, selecting a combustible dust sample, first determining five different dust cloud concentrations, and conducting a ductless explosion venting experiment to obtain the optimal concentration and maximum ductless explosion venting pressure inside the first container under ductless explosion venting conditions. In a specific example, selecting a combustible dust sample, the five different dust cloud concentrations can be calculated based on five different masses and the internal volume of the first container, resulting in a concentration of 250 g / m³. 3 500g / m 3 750g / m 3 1000g / m 3 and 1250g / m 3 Explosion-proof experiments were conducted without a conduit for the five dust cloud concentrations mentioned above, obtaining the five maximum explosion-proof pressure values ​​inside the first container under these conditions. It is assumed that the maximum measured pressure is 0.27 MPa, corresponding to a dust cloud concentration of 750 g / m³. 3 This is the optimal concentration. Therefore, the specific concentration of the dust cloud in the above combustible dust sample is 750 g / m³. 3 The maximum pressure relief pressure without a conduit is 0.27 MPa.

[0094] In some implementations, the first coefficient is different for different types of combustible dust, and the first coefficient is also different for different first containers.

[0095] In practical applications, based on the specific concentration of dust cloud measured under non-conduit explosion relief conditions, a total of 25 sets of explosion relief duct explosion relief experiments with five different turning angles and five different length-to-diameter ratios can be carried out to obtain the maximum explosion relief pressure inside the first container corresponding to each set of experiments.

[0096] Taking a 1-cubic-meter spherical tank as an example, corn starch was selected as the test dust sample to test the maximum explosion relief pressure data of the dust sample at a specific concentration.

[0097] Taking 25 sets of tests with five different turning angles and five different turning aspect ratios as examples, the maximum explosion relief pressures under different turning angles and turning aspect ratios are shown in Table 1 below. Based on the maximum explosion relief pressure data obtained in Table 1, the ratio of the maximum explosion relief pressure inside a 1 cubic meter spherical tank to the maximum explosion relief pressure without a duct was calculated under various explosion relief duct conditions, and the upper limit of the explosion relief pressure ratio for a 1 cubic meter spherical tank was obtained. The upper limit of the explosion relief pressure ratio under different turning angles and turning aspect ratios is shown in Table 2 below.

[0098] Table 1

[0099]

[0100] Table 2

[0101]

[0102]

[0103] Based on the upper limit data of the explosion relief pressure ratio in Table 2, a fitting was performed to obtain the functional relationship between the maximum explosion relief pressure ratio of the corresponding 1 cubic meter spherical tank and the turning angle and the turning length-to-diameter ratio. Here, the functional relationship between the maximum explosion relief pressure ratio of the explosion relief duct and the turning angle and the turning length-to-diameter ratio is specifically expressed as Equation (2):

[0104] P=-0.0254α+0.0027θ+1.4244 (2)

[0105] In equation (2), P is the explosion relief pressure ratio assessment value of a 1 cubic meter spherical tank, in MPa; α is the length-to-diameter ratio of the turning section of the explosion relief conduit; and θ is the turning angle of the explosion relief conduit. The first coefficient corresponding to a 1 cubic meter spherical tank is as follows: A = -0.0254, B = 0.0027, C = 1.4244.

[0106] Thus, given the known geometric dimensions of the explosion relief conduit, the explosion relief pressure ratio of a 1 cubic meter spherical tank under actual explosion relief conditions can be predicted based on the turning angle and the length-to-diameter ratio of the turning angle. By comparing the explosion relief pressure ratio of the 1 cubic meter spherical tank with its upper limit of explosion relief pressure, it can be determined whether the current explosion relief conduit is suitable for the 1 cubic meter spherical tank. That is, whether the explosion relief performance of the explosion relief device formed by the 1 cubic meter spherical tank and the current explosion relief conduit meets the requirements, thereby achieving an effective evaluation of the explosion relief performance of the explosion relief device.

[0107] It should be noted that the corresponding explosion relief pressure ratio assessment value can also be determined based on the size parameters of the explosion relief conduit using a pre-determined mapping table or other methods. This disclosure does not limit the specific method used to determine the explosion relief pressure ratio assessment value based on the size parameters of the explosion relief conduit.

[0108] The following two application examples illustrate the process of determining the explosion relief pressure ratio evaluation value.

[0109] Application Example 1

[0110] A starch production company currently has a corn starch processing technology. In this process, there is a risk of dust explosion inside the dry dust collector used to collect corn starch from the feed inlet. The dust collector is currently equipped with an explosion venting duct. In accordance with relevant national safety production supervision requirements, it is necessary to assess the current explosion venting performance of the dust collector, specifically the maximum explosion venting pressure ratio along the duct.

[0111] The maximum pressure relief ratio data is obtained using the following method.

[0112] 1) The on-site measurement showed that the turning angle of the explosion relief duct was 60°.

[0113] 2) The distance from the turning point of the explosion relief duct to the explosion relief port on both sides of the site is 1m, and the inner diameter of the duct is 0.5m. Dividing the former by the latter, the length-to-diameter ratio of the turning point of the explosion relief duct is 2.

[0114] 3) Substituting the turning angle and the length-to-diameter ratio of the turning angle into the above functional relationship (2), the maximum explosion pressure ratio of the dust collector along the explosion vent is calculated to be 1.5356, indicating that the explosion venting performance of the explosion vent is 1.5356 times that of the explosion vent without a vent. That is, the explosion pressure ratio evaluation value of the explosion vent is 1.5356.

[0115] Application Example 2

[0116] A bread factory uses cornstarch as one of its main raw materials. In this process, a dry dust collector is installed on top of the cornstarch silo, and there is a risk of dust explosion inside this equipment. An explosion venting duct has been installed on the dust collector. In accordance with relevant national safety production supervision requirements, it is currently necessary to assess the explosion venting performance of this dust collector.

[0117] The maximum pressure relief ratio data is obtained using the following method.

[0118] 1) The turning angle of the explosion relief duct was measured to be 10° on site.

[0119] 2) The distance from the turning point of the explosion relief duct to the explosion relief port on both sides of the site is 2m, and the inner diameter of the duct is 0.2m. Dividing the former by the latter, the length-to-diameter ratio of the turning point of the explosion relief duct is 10.

[0120] 3) Substitute the turning angle and turning length-to-diameter ratio data into the above functional relationship (2) to calculate the maximum explosion pressure ratio of the dust collector along the explosion venting duct, which is 1.1974. This indicates that the explosion venting performance of the explosion venting duct is 1.1974 times that of explosion venting without a duct. In other words, the explosion pressure ratio evaluation value of the explosion venting duct is 1.1974.

[0121] Figure 2 A structural block diagram of the test system for the explosion relief device in an embodiment of this disclosure is shown. Figure 3 A schematic diagram showing the structure and connection relationship of the explosion venting device and the test system of the explosion venting device disclosed herein is presented.

[0122] See Figure 2 As shown, the explosion relief device testing system 200 of this embodiment may include:

[0123] Evaluation device 210 is used to determine the explosion relief pressure ratio evaluation value of the first container using the turning angle and the length-to-diameter ratio of the explosion relief conduit, and to determine whether the explosion relief conduit meets the explosion relief requirements of the first container based on the explosion relief pressure ratio evaluation value of the first container and the pre-detected upper limit of the explosion relief pressure ratio of the first container.

[0124] In some embodiments, the evaluation device 210 is specifically used to determine the explosion relief pressure ratio evaluation value of the first container based on the turning angle and turning length-to-diameter ratio of the explosion relief conduit, as well as a predetermined first function and a first coefficient corresponding to the first container; wherein, the first function can be a predefined linear function with the turning angle and turning length-to-diameter ratio as variables.

[0125] The evaluation device 210 can be connected to the automatic control and data acquisition device 250 for the explosion venting conduit. In specific applications, the evaluation device 210 and the automatic control and data acquisition device 250 for the explosion venting conduit can be connected using various wireless or wired connections. Other technical details regarding the evaluation device 210 can be found in the preceding methods section and will not be repeated here.

[0126] like Figure 3 As shown, the explosion venting device testing system 200 may further include:

[0127] The dust spraying device 220 is used to spray a certain amount of combustible powder into the first container under the control of the automatic control and data acquisition device for the explosion venting conduit, so as to form a dust cloud of a specific concentration in the first container.

[0128] The detonation device 230 is used to ignite the dust cloud in the first container to trigger an explosion under the control of the automatic control and data acquisition device for the explosion venting conduit.

[0129] Pressure sensor 240 is used to detect the transient pressure relief inside the first container in real time during each explosion and provide it to the automatic control and data acquisition device for the explosion relief duct.

[0130] The automatic control and data acquisition device 250 is used to determine the maximum explosion relief pressure of the first container under the corresponding explosion relief conditions based on the transient explosion relief pressure data inside the first container during each explosion, so as to detect the maximum explosion relief pressure of the first container with conduit and the maximum explosion relief pressure without conduit, and obtain the upper limit of the explosion relief pressure ratio of the first container.

[0131] like Figure 3As shown, the dust spraying device 220 may include: a pneumatic valve 221, a dust chamber 222, a first valve 223, a compressed air cylinder 224, and a dust diffuser 225. The first container 110 may have a dust opening, and the front opening of the dust chamber 222 is connected to the dust opening. A pneumatic valve 221 is provided at the front opening of the dust chamber 222. The pneumatic valve 221 is used to control the opening and closing of the front opening of the dust chamber 222. When the pneumatic valve 221 is open, the front opening of the dust chamber 222 is open, and the dust chamber 222 can communicate with the inside of the first container 110. When the pneumatic valve 221 is closed, the front opening of the dust chamber 222 is closed, and the dust chamber 222 will not be able to communicate with the inside of the first container 110. The pneumatic valve 221 can be opened or closed under the control of the automatic control and data acquisition device 250 for the explosion venting conduit. Compressed air cylinder 224 is connected to dust chamber 222, first valve 223 is located between compressed air cylinder 224 and dust chamber 222, and dust diffuser 225 is located at the dust opening inside first container 110.

[0132] When not in use, pneumatic valve 221 is in the closed state.

[0133] Before the explosion pressure test, the amount of combustible dust sample can be determined according to the pre-calibrated specific concentration. The corresponding amount of combustible dust sample is manually filled into the dust chamber 222 and the cover of the dust chamber 222 is tightened.

[0134] During the explosion pressure detection process, the first valve 223 can be manually opened to pressurize the dust chamber 222 to the preset powder injection pressure using the gas in the compressed air cylinder 224, and then the first valve 223 can be closed. Then, the automatic control and data acquisition device 5 of the explosion venting conduit controls the pneumatic valve 221 to open through the control signal, so that the dust chamber 222 is connected to the inside of the first container 110. The combustible dust in the dust chamber 222 is blown into the inside of the first container 110 under the pressure in the dust chamber 222, and forms a dust cloud through the action of the dust diffuser 225.

[0135] In some embodiments, the explosion relief device testing system 200 may further include a vacuum device 260 for adjusting the pressure inside the first container in the explosion relief device 100.

[0136] like Figure 3 As shown, the vacuum device 260 may include a vacuum pump 261 and a second valve 262. The vacuum pump 261 is capable of communicating with the inside of the first container 110. The second valve 262 is disposed on the passage between the vacuum pump 261 and the first container 110. The second valve 262 is used to control the opening and closing of the passage between the vacuum pump 261 and the inside of the first container 110.

[0137] Before powder spraying, the vacuum device 260 can be used to adjust the inside of the first container 110 to a negative pressure state to ensure that the inside of the first container 110 is at standard atmospheric pressure after powder spraying and at the moment of ignition. For example, before powder spraying, the second valve 262 can be manually opened, and according to the relationship between volume and pressure under constant volume conditions, combined with the preset powder spraying pressure, the vacuum pump 261 can be used to evacuate the inside of the first container 110 to a specific negative pressure state to ensure that the inside of the first container is at standard atmospheric pressure after powder spraying and at the moment of ignition, and then the second valve 262 can be closed.

[0138] After obtaining the explosion relief pressure data, the pressure inside the first container 110 can be depressurized using the vacuum device 260, so that the pressure inside the first container 110 is the same as the ambient pressure. For example, after obtaining the explosion relief pressure data, the second valve 262 can be manually and slowly opened, and the first container 110 can be depressurized using the vacuum pump 261. When the pressure inside the first container 110 is equal to the indoor ambient pressure, the second valve 262 can be manually closed.

[0139] like Figure 3 As shown, the detonation device 230 may include: ignition electrodes 231 and a chemical ignition head 232. The first container 110 has an opening for mounting the detonation device 230 and a top cover 112 for closing the opening. Two ignition electrodes 231 are detachably fixed to the top cover 112 and electrically connected to the automatic control and data acquisition device 250 (explosion venting conduit). The chemical ignition head 232 is fixed between the two ignition electrodes 231. Thus, by releasing energy through the automatic control and data acquisition device 250, the chemical ignition head 232 can be ignited by the ignition electrodes 231, thereby igniting the dust cloud inside the first container 110 and triggering an explosion.

[0140] The detonation device 230 can be disassembled and installed as needed. For example, the detonation device 230 can be installed when a pressure relief test is required, and can be easily removed when no pressure relief test is required.

[0141] The dust cloud needs specific energy to ignite and explode. The chemical ignition head 232 can be a small spherical pill made of energetic material. The chemical ignition head 232 has two fuses, which are connected to two ignition electrodes 231 respectively.

[0142] The automatic control and data acquisition device 5 for explosion venting can be equipped with a large-capacity first electrical container. This large-capacity first electrical container can release electrical energy to the ignition electrode 231, thereby igniting the chemical ignition head 232 to detonate, and then igniting the dust cloud inside the first container 110, causing an explosion inside the first container 110.

[0143] Pressure sensor 2 can be fixedly installed on the outer wall of the first container 110. Pressure sensor 2 is connected to automatic control and data acquisition device 5 of the explosion relief conduit. Pressure sensor 2 can be used to sense the instantaneous pressure value inside the first container 110 in real time and transmit it to automatic control and data acquisition device 5 of the explosion relief conduit.

[0144] After detonation, the explosive energy inside the first container 110 ruptures the explosion relief disc 130 and propagates along the explosion relief port 111 towards the explosion relief conduit 120. With the aid of the pressure sensor 2 and the automatic control and data acquisition device 5 for the explosion relief conduit, the transient explosion relief pressure data of the first container 110 during the explosion can be recorded. By analyzing the transient explosion relief pressure data during this explosion, the automatic control and data acquisition device 5 for the explosion relief conduit can obtain the maximum explosion relief pressure inside the first container 110 during this explosion.

[0145] After each explosion pressure test is completed, the residual solids and gases in the dust spraying device 220 and the first container 110 can be automatically cleaned by the automatic control and data acquisition device 5 of the explosion venting conduit. For example, the tank cover 112, the second valve 262, and the first valve 223 can be opened manually. The pneumatic valve 221 can be opened by the automatic control and data acquisition device 12 of the explosion venting conduit, and the compressed air from the compressed air cylinder 224 can be used to ventilate the first container 110 and the dust chamber 222, cleaning the residual solids and gases inside the first container 110 and the dust chamber 222. Then, the second valve 262 and the first valve 223 can be closed to prepare for the next test.

[0146] In some embodiments of this disclosure, an explosion relief device 100 is also provided.

[0147] like Figure 3 As shown, the explosion relief device 100 may include: a first container 110 and an explosion relief conduit 120 connected to the explosion relief port 111 of the first container. The explosion relief conduit 120 has a bend structure, and the bend angle and the bend length-to-diameter ratio of the explosion relief conduit 120 are determined according to a predetermined first function and a first coefficient corresponding to the first container 110.

[0148] like Figure 3 As shown, the explosion venting device 100 may further include an explosion venting disc 130, which is fixed to the explosion vent 111 of the first container 110. When an explosion occurs in the first container 110, the explosion venting disc 130 ruptures under the impact of the explosion, and the explosion pressure and explosion flame rush into the explosion venting conduit 120 and are released along the explosion venting conduit 120.

[0149] For details on determining the turning angle and length-to-diameter ratio of the explosion relief duct 120, please refer to the previous method section, which will not be repeated here.

[0150] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0151] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0152] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A test method for an explosion venting device, characterized in that, The explosion relief device includes a first container and an explosion relief conduit installed on the first container, wherein the explosion relief conduit has a bend structure; The testing method for the explosion relief device includes: The explosion relief pressure ratio evaluation value of the first container is determined based on the turning angle and the length-to-diameter ratio of the explosion relief conduit. Based on the explosion relief pressure ratio assessment value of the first container and the pre-obtained upper limit of the explosion relief pressure ratio of the first container, it is determined whether the explosion relief conduit meets the explosion relief requirements of the first container. Specifically, the explosion relief pressure ratio assessment value of the first container is determined based on the turning angle and turning length-to-diameter ratio of the explosion relief conduit, as well as a pre-determined first function and a first coefficient corresponding to the first container. The first function is a predefined linear function with the turning angle and turning length-to-diameter ratio as variables. Wherein, the upper limit of the explosion relief pressure ratio of the first container is the ratio between the maximum explosion relief pressure of the first container with a conduit and the maximum explosion relief pressure without a conduit. Wherein, the first function is represented as , This is the evaluation value of the explosion relief pressure ratio of the first container. The turning angle of the explosion relief duct. The length-to-diameter ratio of the venting conduit at its bend is [missing information]. , and For the first coefficient corresponding to the first container, The first coefficient corresponding to the first container is obtained as follows: the maximum explosion relief pressure of the first container without a conduit and the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected are detected, wherein the turning angle and / or the turning length-to-diameter ratio of the N different explosion relief conduits are different; the first coefficient corresponding to the first container is determined based on the maximum explosion relief pressure of the first container without a conduit, the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected, and the turning angle and turning length-to-diameter ratio of each of the N different explosion relief conduits; wherein N is an integer greater than or equal to 1, and the value of N depends on the number of the first coefficients.

2. The test method for the explosion relief device according to claim 1, characterized in that, Based on the explosion relief pressure ratio assessment value of the first container and the pre-obtained upper limit of the explosion relief pressure ratio of the first container, determine whether the explosion relief conduit meets the explosion relief requirements of the first container, including: When the explosion relief pressure ratio evaluation value is less than or equal to the upper limit of the explosion relief pressure ratio, a first test result is obtained, and the first test result indicates that the explosion relief conduit meets the explosion relief requirements of the first container; When the explosion relief pressure ratio assessment value is greater than the upper limit of the explosion relief pressure ratio, a second test result is obtained, and the second test result indicates that the explosion relief conduit does not meet the explosion relief requirements of the first container.

3. The test method for the explosion relief device according to claim 1, characterized in that, The maximum explosion relief pressure without a conduit and / or the maximum explosion relief pressure with a conduit are detected by the following methods: The dust spraying device is controlled to spray a certain amount of combustible powder into the first container to form a dust cloud of a specific concentration in the first container. The specific concentration refers to the dust cloud concentration corresponding to the maximum explosion pressure without a conduit in the first container. The detonation device is controlled to ignite the dust cloud in the first container to trigger an explosion; The control pressure sensor monitors the transient pressure relief data inside the first container in real time during the explosion. Based on the transient pressure data inside the first container during the explosion, the maximum pressure of the first container under the current pressure relief conditions was determined.

4. A testing system for an explosion venting device, characterized in that, include: Evaluation device; The evaluation device is used to determine the explosion relief pressure ratio evaluation value of the first container by using the turning angle and the turning length-to-diameter ratio of the explosion relief conduit, and to determine whether the explosion relief conduit meets the explosion relief requirements of the first container based on the explosion relief pressure ratio evaluation value of the first container and the pre-detected upper limit of the explosion relief pressure ratio of the first container. Wherein, the upper limit of the explosion relief pressure ratio of the first container is the ratio between the maximum explosion relief pressure of the first container with a conduit and the maximum explosion relief pressure without a conduit. The method of determining the explosion relief pressure ratio evaluation value of the first container using the turning angle and the length-to-diameter ratio of the explosion relief conduit includes: determining the explosion relief pressure ratio evaluation value of the first container based on the turning angle and the length-to-diameter ratio of the explosion relief conduit, as well as a pre-determined first function and a first coefficient corresponding to the first container; wherein the first function is a predefined linear function with the turning angle and the length-to-diameter ratio as variables. Wherein, the first function is represented as ,in, This is the evaluation value of the explosion relief pressure ratio of the first container. The turning angle of the explosion relief duct. The length-to-diameter ratio of the venting conduit at its bend is [missing information]. , and For the first coefficient corresponding to the first container, The first coefficient corresponding to the first container is obtained as follows: the maximum explosion relief pressure of the first container without a conduit and the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected are detected, wherein the turning angle and / or the turning length-to-diameter ratio of the N different explosion relief conduits are different; the first coefficient corresponding to the first container is determined based on the maximum explosion relief pressure of the first container without a conduit, the maximum explosion relief pressure with a conduit when N different explosion relief conduits are connected, and the turning angle and turning length-to-diameter ratio of each of the N different explosion relief conduits; wherein N is an integer greater than or equal to 1, and the value of N depends on the number of the first coefficients.

5. The testing system for the explosion relief device according to claim 4, characterized in that, The evaluation device is specifically used to determine the explosion relief pressure ratio evaluation value of the first container based on the turning angle and the turning length-to-diameter ratio of the explosion relief conduit, as well as a predetermined first function and a first coefficient corresponding to the first container; wherein, the first function is a predefined linear function with the turning angle and the turning length-to-diameter ratio as variables.

6. The testing system for the explosion relief device according to claim 4 or 5, characterized in that, Also includes: A dust spraying device is used to spray a quantitative amount of combustible powder into a first container under the control of an automatic control and data acquisition device to form a dust cloud of a specific concentration in the first container. The specific concentration refers to the dust cloud concentration corresponding to the maximum explosion pressure without a conduit in the first container. An ignition device is used to ignite the dust cloud in the first container to trigger an explosion under the control of an automatic control and data acquisition device; Pressure sensors are used to detect the transient pressure relief inside the first container during each explosion in real time and provide it to the automatic control and data acquisition devices. An automatic control and data acquisition device is used to determine the maximum explosion relief pressure of the first container under corresponding explosion relief conditions based on the transient explosion relief pressure data inside the first container during each explosion, so as to detect the maximum explosion relief pressure of the first container with a conduit and the maximum explosion relief pressure without a conduit, and obtain the upper limit of the explosion relief pressure ratio of the first container.

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