摘要
城市燃气以往长期使用含有较多萘杂质的人工煤气,近年来被天然气置换后,已沉积的萘随着天然气的流动在管道内运移有可能导致管道堵塞或设备损害,甚至影响城市燃气输配系统的安全运行。为了研究燃气管道中已沉积萘的运移问题,以云南省昆明市的燃气管道为例,运用Fluent流体动力学软件,选用离散相模型(RSM)和雷诺应力模型(DPM),模拟分析了在燃气管网常见的水平直管、水平弯管、三通管等3种管型内已沉积萘的运移规律,研究在不同的管径、弯曲比和管径比下,粒径、气流速度、温度和压力对已沉积萘运移的影响。研究结果表明:①水平直管、水平弯管、三通管中萘的运移率与沉积萘的粒径呈负相关关系,与压力、入口速度呈正相关关系;②随着温度升高,水平直管、水平弯管、三通管中萘的运移率先减小而后增大;③萘在燃气管道中的运移率受入口速度的影响最大,受温度的影响次之,受压力的影响最小;④萘的运移率与水平直管管径、三通管管径比呈正相关关系,与水平弯管弯曲比呈负相关关系。结论认为,该研究成果对于保障城市燃气输配系统的安全运行具有重要的意义。
The manufactured gases containing such impurities as naphthalene particles had been long used as urban gas,but they have been recently replaced by natural gas.The deposited naphthalene particles migrating along with the current gas flow will inevitably result in pipe blockage or damage to devices.In order to study the migration law of the deposited naphthalene particles in gas line pipes,we took the urban gas pipeline in Kunming as an example,adopted the RSM turbulence model and the DPM model of the Fluent software to simulate and analyze the migration law of the deposited naphthalene particles in horizontal straight pipes,horizontal bend pipes and tee pipes.And the influence of the deposited naphthalene particle size,inlet velocity,temperature and pressure on the migration of deposited naphthalene particles under different pipe diameters,curvature ratios and pipe diameter ratios were analyzed respectively.The results show that:(1)The migration rates of deposited naphthalene particles in the above three types of pipes are negatively correlated with the size of the deposited naphthalene particles,and are positively correlated with pressure and inlet velocity;(2)With the increase of temperature,the migration rate of naphthalene particles in the above three types of pipes decreases first and then increases;(3)The migration rate of naphthalene particles deposited in gas line pipes is most affected by the inlet velocity of gas flow,then by temperature and least by pressure.(4)The migration rate of naphthalene particles is positively correlated with the ratio of horizontal straight pipe diameter and tee pipe diameter,and negatively correlated with the ratio of horizontal bend pipe diameter.In conclusion,this study is of great significance in guaranteeing the safe operation of urban gas transportation and distribution system.
作者
吴晓南
李倩
苟珈源
胡镁林
李钊
廖红
Wu Xiaonan;Li Qian;Gou Jiayuan;Hu Meilin;Li Zhao;Liao Hong(School of Civil Engineering and Architecture,Southwest Petroleum University,Chengdu,Sichuan 610500,China;PetroChina Kunlun Gas Co.,Ltd.-Yunnan,Kunming,Yunnan 650200,China;Sales Company,Shunan Division of PetroChina Southwest Oil&Gasfield Company,Luzhou,Sichuan 646000,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2019年第8期104-112,共9页
Natural Gas Industry
关键词
城市燃气管道
人工煤气
天然气
置换
已沉积萘
气固两相流
运移率
影响因素
Urban gas line pipe
Manufactured gas
Natural gas
Displacement
Deposited naphthalene particle
Gas–solid two phase flow
Migration rate
Influence factor
