Research On Pipeline Leakage Diffusion Law And Leakage Location Based On Gas Concentration Detection

Safety production is the precondition for the development of enterprises.With the increasing of the pipelines using time,the potential risks of leakage are also increasing.The gas medium transported by overhead pipeline in iron and steel production enterprises is flammable,explosive and toxic.If the initial leakage can be found in time,it can avoid causing serious personnel poisoning or pool fire explosion accident.Therefore,the intelligent patrolling method is adopted to accurately locate the leakage point of the pipeline,which can not only find the failure position of the pipeline in time for repair,but also reduce the workload of the patrolling person.It is of great significance to study an intelligent inspection device for Baosteel overhead pipeline.In this paper,the leakage gas of overhead pipeline is taken as the research object,and the gas leakage diffusion law and the detection method of intelligent patrol device are studied by using the numerical simulation method.At the same time,in order to find the location of pipeline leakage,the gas source location was carried out based on the simulated annealing algorithm,and the algorithm was further optimized to improve the location performance.The main research contents of this paper include:(1)Based on the task requirements that could not affect the operation of overhead pipelines and combined with the specific situation of field pipelines,this paper puts forward a scheme of using intelligent inspection robot to inspect pipelines and puts forward functional requirements of each part.According to the national standard to select the required sensor parameters,to provide a basis for the development of the working mode of the detection device;The Kent risk assessment method is used to know which one is the key pipeline,the pipeline inspection frequency should be increased to prevent serious accidents.(2)Through the analysis of the influence factors of gas diffusion,four main factors concerned in this paper are obtained,and the gas diffusion law under the influence of the changes of these four factors is explored.In order to make the numerical simulation environment closer to the real scene,three types of pipeline three-dimensional models were established,and the three average wind speeds with the highest wind frequency were obtained by statistics.The AR model was used to simulate the random wind speed time history corresponding to the average wind speed with Davenport spectrum as the target spectrum.The orthogonal experiment is used to organize the experiment scheme to carry out multi-group simulation calculation.(3)According to the leakage and diffusion characteristics of different gas transmission pipelines and the detection requirements of gas sensors,the engineering solutions of applying the patrol inspection device to the leakage detection of overhead pipelines are studied.It is mainly based on the sensor detection threshold to determine the best working mode of laser sensor and pump sensor in different pipeline areas,and reduce the residence time and shorten the detection cycle under the same inspection effect.Finally,according to the working mode of the detection device,the inspection path is planned in each area of the factory.(4)When the device detects abnormal concentration value of space gas,it immediately enters the stage of determining the leakage location of active olfactory pipeline.The plume model used for gas source location was selected.The space gas concentration information simulated by Fluent above was the search environment and the release source was determined based on the simulated annealing algorithm for the pipeline leak location.The simulated annealing algorithm was optimized by adjusting the search radius along with the search process to improve the location effect.