| Under the trend of global natural gas energy reform,the domestic natural gas industry is also developing at a high speed.The major gas companies are constantly exploring natural gas pipeline network,but also put forward higher requirements for intelligent natural gas pipeline network.However,there are still some problems in the remote transmission of fixed-point data monitoring in the current intelligent natural gas pipeline network.In remote areas,the surge station and surge tank/cabinet are still short of electricity and power,and there is a lack of energy in the integrity management of the pipeline network.For this reason,the miniaturization technology and device design and research of pressure energy utilization in natural gas pipeline network are put forward in this paper,aiming at small pressure regulating station and pressure regulating box/cabinet.In this paper,the working background and power demand of surge stations,surge tanks and cabinets in remote areas are discussed.The miniaturized external and internal processes for pressure energy utilization of natural gas pipeline network are designed for surge stations and surge tanks/cabinets respectively,and the main technical parameters of key equipment are analyzed.Secondly,on the basis of designing the miniaturization technology of pressure energy utilization in natural gas pipeline network,further research is carried out.Among them,the load coordination analysis of the miniaturized external device is carried out for the pipeline network system and the power supply system.The results show that the pressure and temperature of the import and export gas of the device change little,and the flow rate is less than 1% of the total flow rate of the regulator station,so it can be seamlessly connected with the original regulator system.In addition,the output voltage of the generator is maintained in the range of 24.5-27.4V when the battery is charged by the power generation device.The current ranges from 6 to 7.5 A,and the fluctuation is only about 10%.Then,the fluent fluid simulation of the miniaturized built-in device for pressure energy utilization in natural gas pipeline network is carried out.In the impeller model,the number of blades and the angle between blade and axis will affect the power generation of the model.From the numerical model analysis,it can be concluded that when the number of blades is 9and the angle between blade and axis is 60 degrees,the impeller model can get the optimal power generation.At the same time,the experimental analysis of impeller model shows that the angle between impeller and axis and the number of blades in the device will affect the power of impeller.When the flow rate is above 1500 Nm3/h,the power of impeller whoseaxis angle reaches 60 degrees will increase by more than 30% compared with that of 45 degrees.The maximum power of impeller with 9 blades is 2.9 times of that of impeller with 5blades.The results of the model are consistent.Finally,a miniaturized built-in process for pressure energy utilization in natural gas pipeline network is designed based on a domestic surge tank.The process flow design,key equipment selection,system operation elasticity analysis and investment cost analysis are also carried out.The results show that the high-pressure natural gas of 2000 Nm3/h and 0.4 MPa can reduce the pressure to 0.1 MPa,and the output power is about 200 W,which can meet the power demand of the surge tank/cabinet. |
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