A method for predicting and correcting gas leakage concentration field and estimating leakage rate of integrated pipeline gallery
A technology of comprehensive pipe gallery and leakage rate, which is applied in the directions of calculation, image analysis, data processing, etc., can solve problems such as suffocation casualties, explosions, and threats to citizens' life safety in urban safe operation, so as to improve efficiency and accuracy, and suppress effect of influence
Active Publication Date: 2021-11-16
CHINA UNIV OF MINING & TECH (BEIJING)
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But at the same time, the occurrence of one type of disaster in the utility tunnel may lead to the occurrence of other types of disasters, causing greater harm, especially the leakage of gas pipelines in the utility tunnel may lead to accidents such as suffocation, casualties and explosions, and may cause A series of secondary disasters pose a huge threat to the safe operation of the city and the lives of citizens
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[0016] One-dimensional convection-diffusion equation (ADE) is used as the control equation of the gas leakage and diffusion simulation model of this embodiment;
[0017]
[0018] In the formula, c represents the average concentration of gas in the gas tank section of the pipe gallery, u represents the wind speed, and D x denotes the diffusion coefficient and q denotes the source term. Using MATLAB programming, the finite difference method (FDM) is used to explicitly solve the above governing equations after discretization. In order to ensure the stability of the calculation, the time step will be automatically adjusted so that the Courant number is always less than 1. The calculation results obtained from the one-dimensional convection-diffusion model will be used as the prediction value of the improved ensemble Kalman filter algorithm. The prediction process of the improved ensemble Kalman filter algorithm is as follows:
[0019]
[0020] In the formula, is the pred...
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The invention discloses a method for predicting and correcting the gas leakage concentration field of a comprehensive pipe gallery and estimating the leakage rate. This method combines the real-time monitoring data of gas sensors, wind speed and direction sensors, and temperature and humidity sensors in the cabin of the integrated pipeline gallery, and builds a numerical calculation model of gas leakage and diffusion in the cabin of the integrated pipeline gallery, and uses the data assimilation algorithm to carry out the process of gas leakage and gas pipeline leakage. rate forecast. The data assimilation algorithm is an improved ensemble Kalman filter algorithm, and the state vector of the algorithm is composed of gas concentration value and leakage rate. The method of the present invention combines the monitoring data of the wind speed and direction sensor and the temperature and humidity sensor, and after adding noise in line with the actual situation to the wind speed and diffusion coefficient, the influence of the uncertainty of the wind speed and diffusion coefficient on the results can be suppressed. At the same time, it can accurately invert and estimate the leakage rate of gas pipelines, which is more in line with the actual situation.
Description
technical field [0001] The invention belongs to the field of urban public security, and in particular relates to a method for predicting and correcting the leakage concentration field of a gas pipeline in a comprehensive utility gallery and estimating a leakage rate. Background technique [0002] The urban underground comprehensive pipe gallery integrates all kinds of public pipelines installed on the ground, underground or overhead, makes full use of the urban underground space, avoids repeated excavation of the road surface, ensures the full play of road traffic functions, and creates Good living environment for citizens. The construction of comprehensive pipe gallery plays an important role in making full use of underground space, saving investment, stimulating economic development, changing the appearance of the city, and ensuring urban safety. But at the same time, the occurrence of one type of disaster in the utility tunnel may lead to the occurrence of other types of...
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IPC IPC(8): G06T7/277G06Q50/06
CPCG06Q50/06G06T7/277
Inventor 吴建松原帅琪张灿
Owner CHINA UNIV OF MINING & TECH (BEIJING)