Technology Study On Recoveirng Light Hydrocarbons Cold Energy With Shallow Condensing Unit

This paper through research and analysis operation of the gas branch of DaqingOilfield existing shallow condensing unit. And passes through the massive computations,obtained the shallow condensing unit cold quantity recycling correlation mathematicalmodel and the natural data. Proposed the possible cold energy recycling flow. And onthe proposed process for analysis, optimization, and ultimately put forward workableproposals. Finally to the optimization plan which proposed has carried on the equipmentshaping and the economic efficiency analysis.The paper main contents:（1）Site investigation and parameters collection. Components of laboratory tests on theraw material gas, dry gas and light hydrocarbons. Evaluation of existing shallowcondensing unit related equipment operating condition. Analysis installment cold energyuse present situation;（2）Establishment hydrocarbon-gas heat transfer model. Calculation of energy functionchanges of light hydrocarbons. Determine a reasonable amount of light hydrocarbonrecovery cold temperature interval;（3）Study on temperature rise process of light hydrocarbon in the relationships betweenthe temperature, pressure and phase transitions. Determine the appropriate heatexchanger temperature and pressure;（4）Phase transition and flow instability characteristics in the study of light hydrocarbonsat elevated temperatures. Determination being suitable heat transfer form and heatexchange equipment;（5）Study on light hydrocarbon recovering cold energy impact on natural gas recoveringcold energy;（6）Study on light hydrocarbon recovering cold energy effect on refrigerationtemperature and light hydrocarbon yield;（7）Through to the recovering cold energy to the refrigeration unit load and the energy consumption, the refrigeration temperature, the light hydrocarbon receives rate theinfluence, and carries on the economic evaluation;（8）By process simulation, comparative advantages and disadvantages of variousoptions. Determine the most appropriate technology for light hydrocarbon recoveringcold energy;Through the study of the project, optimization of light hydrocarbons and gas thecooling energy of the recovery500#shallow condensing unit. Achieve the purpose ofsaving refrigeration unit power consumption and circulating cooling water. The proposedscheme has higher operability. Following the success of the project may provide thetechnical support for other shallow condensing unit of light hydrocarbon cold recyclingtransformation. This has important economic significance.