CN-122021091-A - Explosion-proof equipment safety performance detection method based on finite element simulation assistance

CN122021091ACN 122021091 ACN122021091 ACN 122021091ACN-122021091-A

Abstract

The invention provides a method for detecting safety performance of explosion-proof equipment based on finite element simulation assistance, and belongs to the field of explosion-proof equipment detection. The method comprises the following steps of establishing a corresponding geometric model by measuring relevant parameters of the explosion-proof equipment, solving the geometric model to obtain the maximum strain of a key position, then carrying out real-time detection by arranging a stress-strain monitoring device, and finally evaluating the safety performance of the explosion-proof equipment. The method has the advantages that the safety performance evaluation of the explosion-proof equipment can be realized, the structure to be measured is not required to be destroyed for measurement, the safety performance measurement and evaluation of the explosion-proof shell can be realized by only using the testing device comprising the strain gauge, the measurement accuracy is high, the model operation speed is high, and the accuracy of the measurement result is effectively improved.

Inventors

WANG TINGYI
ZHAO FENG
ZHAO WEI
LI FENG
GAO FENG
YANG XIANGLIAN
SHEN YUE
XU MINGMING
ZHANG JIN

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (9)

1. The method for detecting the safety performance of the explosion-proof equipment based on the finite element simulation assistance is characterized by comprising the following steps of: S1, acquiring parameters of in-service explosion-proof equipment to be detected, and establishing a corresponding geometric model; S2, setting a pressure value on the inner surface of the geometric model, solving the pressure value, and finding out a first key position and a second key position; s3, monitoring the strain quantity of the corresponding first key position and the corresponding second key position of the in-service explosion-proof equipment in real time, and judging the safety performance of the explosion-proof equipment according to a monitoring result.
2. The method for detecting the safety performance of the explosion-proof equipment according to claim 1, wherein the step S1 specifically comprises: S11, acquiring relevant parameters of the in-service flameproof equipment to be detected; S12, building a geometric model of the explosion-proof equipment in finite element simulation software, setting materials of the geometric model, dividing grids, and setting contact and mechanical conditions.
3. The method for detecting the safety performance of the explosion-proof equipment according to claim 2, wherein the step S2 specifically comprises: S21, setting different pressure values on the inner surface of the geometric model, solving for a plurality of times, finding out a pressure value which can enable the deformation of the joint surface of the flameproof equipment to reach the maximum clearance allowed by the flameproof equipment, calculating the pressure value as a first pressure value F 1 , marking the position 1mm above the first pressure value F 1 as a first key position, and recording the maximum strain sigma 1max of the first key at the moment; S22, setting a second pressure value F 2 on the inner surface of the geometric model, wherein the second pressure value F 2 is the sum of explosion pressure F 0 and the first pressure value F 1 , solving and finding out the maximum deformation position of the material of the explosion-proof equipment, marking the maximum deformation position as a second key position, and recording the maximum strain sigma 2max of the second key position at the moment.
4. The method for detecting the safety performance of the explosion-proof equipment according to claim 3, wherein the step S3 specifically comprises: S31, utilizing a stress-strain detection device to monitor the first key position and the second key position of the normal-operation explosion-proof equipment in real time; s32, comparing the measured maximum strain quantity sigma 1max and the maximum strain quantity sigma 2max with a safety threshold sigma' of the corresponding position respectively, and judging the safety performance of the explosion-proof equipment.
5. The method for detecting the safety performance of the explosion-proof equipment according to claim 4, wherein the method for calculating the safety threshold σ' in the step S32 is as follows: σ’=σ max /K; Where σ max is the maximum strain amount at the corresponding critical position, K is the safety factor, usually 1.5.
6. The method for detecting the safety performance of the explosion-proof equipment according to claim 4, wherein the method for judging the safety performance of the explosion-proof equipment in the step S32 is specifically as follows: If the maximum strain quantity sigma 1max and the maximum strain quantity sigma 2max are both lower than the corresponding safety threshold value sigma', the pressure bearing capacity of the explosion-proof equipment is normal, otherwise, the pressure bearing capacity of the explosion-proof equipment is judged to be abnormal.
7. The method for detecting the safety performance of the explosion-proof equipment according to claim 2, wherein in the step S12, the built geometric model is to set the contact between the joint surfaces of the explosion-proof equipment to be friction contact.
8. The method for detecting the safety performance of the explosion-proof equipment according to claim 2, wherein in the step S12, the built geometric model is a bolt of the explosion-proof equipment replaced by a dotted line.
9. The method for detecting the safety performance of the explosion-proof equipment according to claim 4, wherein the stress-strain monitoring device comprises a strain gauge module, an excitation signal generation module, a signal processing module and a data acquisition module, the strain gauge module comprises a sensitive element, a substrate, a covering layer and a lead wire, and the sensitive element is fixed on the substrate.

Description

Explosion-proof equipment safety performance detection method based on finite element simulation assistance Technical Field The invention relates to the field of detection of explosion-proof equipment, in particular to a method for detecting safety performance of explosion-proof equipment based on finite element simulation assistance. Background Along with the rapid development of industrial technology in China, the explosion-proof type explosion-proof distribution box and explosion-proof equipment are widely applied to industries such as petrochemical industry, transportation, construction and the like. The flameproof device has flameproof performance, can avoid fire and explosion accidents caused by factors such as sparks, high temperature and the like, and is suitable for flammable and explosive places, dangerous chemical factories, oilfield drilling platforms and other areas. The equipment has the characteristics of flexibility, convenience, safety and the like, and is widely applied to industries such as petroleum, chemical industry, electric power, highways, mines and the like and industrial production fields. The common feature of the flameproof electrical devices is that the parts which may generate sparks in normal operation or in accident conditions are placed in one or in several housings. In addition to isolating the spark inside the enclosure, the arc from the explosive gases in the surrounding environment, the connections between the various parts inside the enclosure should have certain structural dimensions and structural strength. When the explosive gas mixture entering the housing is ignited by a spark in the housing, the housing is not blow up or cause the explosive material to detonate the explosive gas mixture in the surrounding environment through the connection gap. Such an electrical equipment enclosure capable of withstanding the explosion pressure of the internal explosive gas mixture and preventing the propagation of the internal explosion to the explosive mixture around the enclosure is called an explosion-proof equipment, and an electrical equipment having the explosion-proof equipment is called an explosion-proof electrical equipment. Because the flameproof device is commonly used in dangerous fields such as electric power, petroleum, chemical industry and the like, the safety and the reliability of the flameproof device must be ensured in the use process. Therefore, it is necessary to provide a method for detecting the safety performance of the explosion-proof equipment efficiently and accurately. Disclosure of Invention The invention aims to provide a method for detecting the safety performance of the flameproof equipment based on finite element simulation assistance, which is efficient and accurate in detecting the safety performance of the flameproof equipment. The invention provides a method for detecting the safety performance of explosion-proof equipment based on finite element simulation assistance, which is characterized in that the deformation degree of the explosion-proof equipment is corresponding to a stress value at a specific position by combining mechanical simulation, and the deformation degree of a measured object can be accurately and rapidly obtained by using a strain gauge, so that the safety performance of the equipment is verified. In order to realize the functions, the invention is realized by the following measures: the method for detecting the safety performance of the explosion-proof equipment based on the finite element simulation assistance is characterized by comprising the following steps of: S1, acquiring parameters of in-service explosion-proof equipment to be detected, and establishing a corresponding geometric model; S2, setting a pressure value on the inner surface of the geometric model, solving the pressure value, and finding out a first key position and a second key position; s3, monitoring the strain quantity of the corresponding first key position and the corresponding second key position of the in-service explosion-proof equipment in real time, and judging the safety performance of the explosion-proof equipment according to a monitoring result. The step S1 specifically includes: S11, acquiring relevant parameters of the in-service flameproof equipment to be detected, wherein the relevant parameters comprise key parameters such as the external dimension of the flameproof equipment, flameproof gaps and the like, measuring the specific dimension parameters of the flameproof equipment by adopting a direct measurement method or an indirect measurement method, wherein the direct measurement method is suitable for measuring the parameters such as the length, the width, the height and the like of the shell of the flameproof equipment by using measuring tools such as a caliper, a vernier caliper, a micrometer and the like, and the indirect measurement method is used for calculating the dimension to be measured by utilizing the geometric relation