Heat Load Calculation And Operation Parameter Optimization Of Oil Port Steam System

Oil port serves as a bridge for storage,transportation and processing of crude oil and refined oil.With the increase of demand in strategic reservation of crude oil in our country and for the mission proposed in “the Thirteen-Five-year Plan for the Oil Development”,the development of oil port is imperative.But with the rapid development of oil port,the management model that has been formed in the oil port for many years is unable to meet the requirements of the new period,especially the oil port steam system.The steam pipe network has been retrofitted for many years.Compared with the initial design state,the multi-ring and multi-level complex state has been formed.The initial pipeline network management process is no longer suitable for the upgraded pipe network.Moreover,in the production management of steam system,the real-time temperature,pressure and flow rate of the pipe network cannot be obtained due to the large complex pipe network and the lack of measuring equipment.It is difficult for staff to judge the steam flow direction,flow rate and steam overheating in some pipes,thus it has a great impact on the actual operation.The thermal load of energy equipment and the demand of heating medium are often made by steam system operators according to previous experience.This operation lacks of theoretical guidance and is of great blindness.Based on the problems existing in the oil port steam system,the main work of this paper is as follows.(1)On the basis of specifying the route of storage tank heat transfer and according to the theory of heat transfer,a physical and a mathematical model for the heat transfer of a single plate and a double plate floating roof storage tank are established.The calculation formula of heat transfer coefficient of storage tank bottom,storage tank top and storage tank wall was obtained respectively.(2)In order to calculate the temperature distribution in the storage tank and the method of numerical calculation,the discrete equations of discrete regions and points in the storage tank were established.The temperature field distribution and heating load were obtained by iteration.The calculation results are compared with the measured data,and the accuracy of the calculation model is verified.This paper presents a new method for calculating thermal load based on numerical calculation.(3)The joint model of hydraulic and thermodynamic steam pipes was constructed.Combining relevant knowledge in graph and thermal properties calculation program of water and steam based on IAPWS-IF97 formula,a hydraulic and thermodynamic model of steam pipe network was established.Through comparative verification,the model can accurately calculate the running parameters of any pipe in the network.(4)On the basis of analyzing the effective utilization rate of storage tank heating energy,optimization of a heating task of an harbor steam system was conducted.Through numerical calculation model and hydraulic-thermodynamic model of pipe network,variation of each parameter of the oil port steam system was obtained after pressure going up.This process provides theoretical support for the optimization of operation parameters of oil port steam system.